From ff8631cdc23ad42f662a8510c57aeb0555ac3d5f Mon Sep 17 00:00:00 2001
From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Date: Fri, 18 Oct 2024 22:59:46 +0530
Subject: [PATCH 01/16] book3s64/hash: Add hash_debug_pagealloc_alloc_slots()
 function

This adds hash_debug_pagealloc_alloc_slots() function instead of open
coding that in htab_initialize(). This is required since we will be
separating the kfence functionality to not depend upon debug_pagealloc.

Now that everything required for debug_pagealloc is under a #ifdef
config. Bring in linear_map_hash_slots and linear_map_hash_count
variables under the same config too.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/d1d5aabe1e4c693a983e59ccf3de08e3c28c5161.1729271995.git.ritesh.list@gmail.com
---
 arch/powerpc/mm/book3s64/hash_utils.c | 29 ++++++++++++++++-----------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index 6e3860224351..030c120d1399 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -123,8 +123,6 @@ EXPORT_SYMBOL_GPL(mmu_slb_size);
 #ifdef CONFIG_PPC_64K_PAGES
 int mmu_ci_restrictions;
 #endif
-static u8 *linear_map_hash_slots;
-static unsigned long linear_map_hash_count;
 struct mmu_hash_ops mmu_hash_ops __ro_after_init;
 EXPORT_SYMBOL(mmu_hash_ops);
 
@@ -274,6 +272,8 @@ void hash__tlbiel_all(unsigned int action)
 }
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
+static u8 *linear_map_hash_slots;
+static unsigned long linear_map_hash_count;
 static DEFINE_RAW_SPINLOCK(linear_map_hash_lock);
 
 static void kernel_map_linear_page(unsigned long vaddr, unsigned long lmi)
@@ -328,6 +328,19 @@ static void kernel_unmap_linear_page(unsigned long vaddr, unsigned long lmi)
 				     mmu_kernel_ssize, 0);
 }
 
+static inline void hash_debug_pagealloc_alloc_slots(void)
+{
+	if (!debug_pagealloc_enabled())
+		return;
+	linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
+	linear_map_hash_slots = memblock_alloc_try_nid(
+			linear_map_hash_count, 1, MEMBLOCK_LOW_LIMIT,
+			ppc64_rma_size,	NUMA_NO_NODE);
+	if (!linear_map_hash_slots)
+		panic("%s: Failed to allocate %lu bytes max_addr=%pa\n",
+		      __func__, linear_map_hash_count, &ppc64_rma_size);
+}
+
 static inline void hash_debug_pagealloc_add_slot(phys_addr_t paddr, int slot)
 {
 	if (!debug_pagealloc_enabled())
@@ -361,6 +374,7 @@ int hash__kernel_map_pages(struct page *page, int numpages,
 {
 	return 0;
 }
+static inline void hash_debug_pagealloc_alloc_slots(void) {}
 static inline void hash_debug_pagealloc_add_slot(phys_addr_t paddr, int slot) {}
 #endif /* CONFIG_DEBUG_PAGEALLOC */
 
@@ -1223,16 +1237,7 @@ static void __init htab_initialize(void)
 
 	prot = pgprot_val(PAGE_KERNEL);
 
-	if (debug_pagealloc_enabled()) {
-		linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
-		linear_map_hash_slots = memblock_alloc_try_nid(
-				linear_map_hash_count, 1, MEMBLOCK_LOW_LIMIT,
-				ppc64_rma_size,	NUMA_NO_NODE);
-		if (!linear_map_hash_slots)
-			panic("%s: Failed to allocate %lu bytes max_addr=%pa\n",
-			      __func__, linear_map_hash_count, &ppc64_rma_size);
-	}
-
+	hash_debug_pagealloc_alloc_slots();
 	/* create bolted the linear mapping in the hash table */
 	for_each_mem_range(i, &base, &end) {
 		size = end - base;
-- 
2.50.1


From 43919f4154bebbef0a0d3004f1b022643d21082c Mon Sep 17 00:00:00 2001
From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Date: Fri, 18 Oct 2024 22:59:47 +0530
Subject: [PATCH 02/16] book3s64/hash: Refactor hash__kernel_map_pages()
 function

This refactors hash__kernel_map_pages() function to call
hash_debug_pagealloc_map_pages(). This will come useful when we will add
kfence support.

No functionality changes in this patch.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/0cb8ddcccdcf61ea06ab4d92aacd770c16cc0f2c.1729271995.git.ritesh.list@gmail.com
---
 arch/powerpc/mm/book3s64/hash_utils.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index 030c120d1399..da9b089c8e8b 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -349,7 +349,8 @@ static inline void hash_debug_pagealloc_add_slot(phys_addr_t paddr, int slot)
 		linear_map_hash_slots[paddr >> PAGE_SHIFT] = slot | 0x80;
 }
 
-int hash__kernel_map_pages(struct page *page, int numpages, int enable)
+static int hash_debug_pagealloc_map_pages(struct page *page, int numpages,
+					  int enable)
 {
 	unsigned long flags, vaddr, lmi;
 	int i;
@@ -368,6 +369,12 @@ int hash__kernel_map_pages(struct page *page, int numpages, int enable)
 	local_irq_restore(flags);
 	return 0;
 }
+
+int hash__kernel_map_pages(struct page *page, int numpages, int enable)
+{
+	return hash_debug_pagealloc_map_pages(page, numpages, enable);
+}
+
 #else /* CONFIG_DEBUG_PAGEALLOC */
 int hash__kernel_map_pages(struct page *page, int numpages,
 					 int enable)
-- 
2.50.1


From 685d942d00d8b0edf8431869028e23eac6cc4bab Mon Sep 17 00:00:00 2001
From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Date: Fri, 18 Oct 2024 22:59:48 +0530
Subject: [PATCH 03/16] book3s64/hash: Make kernel_map_linear_page() generic

Currently kernel_map_linear_page() function assumes to be working on
linear_map_hash_slots array. But since in later patches we need a
separate linear map array for kfence, hence make
kernel_map_linear_page() take a linear map array and lock in it's
function argument.

This is needed to separate out kfence from debug_pagealloc
infrastructure.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/5b67df7b29e68d7c78d6fc1f42d41137299bac6b.1729271995.git.ritesh.list@gmail.com
---
 arch/powerpc/mm/book3s64/hash_utils.c | 47 ++++++++++++++-------------
 1 file changed, 25 insertions(+), 22 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index da9b089c8e8b..cc2eaa97982c 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -272,11 +272,8 @@ void hash__tlbiel_all(unsigned int action)
 }
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
-static u8 *linear_map_hash_slots;
-static unsigned long linear_map_hash_count;
-static DEFINE_RAW_SPINLOCK(linear_map_hash_lock);
-
-static void kernel_map_linear_page(unsigned long vaddr, unsigned long lmi)
+static void kernel_map_linear_page(unsigned long vaddr, unsigned long idx,
+				   u8 *slots, raw_spinlock_t *lock)
 {
 	unsigned long hash;
 	unsigned long vsid = get_kernel_vsid(vaddr, mmu_kernel_ssize);
@@ -290,7 +287,7 @@ static void kernel_map_linear_page(unsigned long vaddr, unsigned long lmi)
 	if (!vsid)
 		return;
 
-	if (linear_map_hash_slots[lmi] & 0x80)
+	if (slots[idx] & 0x80)
 		return;
 
 	ret = hpte_insert_repeating(hash, vpn, __pa(vaddr), mode,
@@ -298,36 +295,40 @@ static void kernel_map_linear_page(unsigned long vaddr, unsigned long lmi)
 				    mmu_linear_psize, mmu_kernel_ssize);
 
 	BUG_ON (ret < 0);
-	raw_spin_lock(&linear_map_hash_lock);
-	BUG_ON(linear_map_hash_slots[lmi] & 0x80);
-	linear_map_hash_slots[lmi] = ret | 0x80;
-	raw_spin_unlock(&linear_map_hash_lock);
+	raw_spin_lock(lock);
+	BUG_ON(slots[idx] & 0x80);
+	slots[idx] = ret | 0x80;
+	raw_spin_unlock(lock);
 }
 
-static void kernel_unmap_linear_page(unsigned long vaddr, unsigned long lmi)
+static void kernel_unmap_linear_page(unsigned long vaddr, unsigned long idx,
+				     u8 *slots, raw_spinlock_t *lock)
 {
-	unsigned long hash, hidx, slot;
+	unsigned long hash, hslot, slot;
 	unsigned long vsid = get_kernel_vsid(vaddr, mmu_kernel_ssize);
 	unsigned long vpn = hpt_vpn(vaddr, vsid, mmu_kernel_ssize);
 
 	hash = hpt_hash(vpn, PAGE_SHIFT, mmu_kernel_ssize);
-	raw_spin_lock(&linear_map_hash_lock);
-	if (!(linear_map_hash_slots[lmi] & 0x80)) {
-		raw_spin_unlock(&linear_map_hash_lock);
+	raw_spin_lock(lock);
+	if (!(slots[idx] & 0x80)) {
+		raw_spin_unlock(lock);
 		return;
 	}
-	hidx = linear_map_hash_slots[lmi] & 0x7f;
-	linear_map_hash_slots[lmi] = 0;
-	raw_spin_unlock(&linear_map_hash_lock);
-	if (hidx & _PTEIDX_SECONDARY)
+	hslot = slots[idx] & 0x7f;
+	slots[idx] = 0;
+	raw_spin_unlock(lock);
+	if (hslot & _PTEIDX_SECONDARY)
 		hash = ~hash;
 	slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
-	slot += hidx & _PTEIDX_GROUP_IX;
+	slot += hslot & _PTEIDX_GROUP_IX;
 	mmu_hash_ops.hpte_invalidate(slot, vpn, mmu_linear_psize,
 				     mmu_linear_psize,
 				     mmu_kernel_ssize, 0);
 }
 
+static u8 *linear_map_hash_slots;
+static unsigned long linear_map_hash_count;
+static DEFINE_RAW_SPINLOCK(linear_map_hash_lock);
 static inline void hash_debug_pagealloc_alloc_slots(void)
 {
 	if (!debug_pagealloc_enabled())
@@ -362,9 +363,11 @@ static int hash_debug_pagealloc_map_pages(struct page *page, int numpages,
 		if (lmi >= linear_map_hash_count)
 			continue;
 		if (enable)
-			kernel_map_linear_page(vaddr, lmi);
+			kernel_map_linear_page(vaddr, lmi,
+				linear_map_hash_slots, &linear_map_hash_lock);
 		else
-			kernel_unmap_linear_page(vaddr, lmi);
+			kernel_unmap_linear_page(vaddr, lmi,
+				linear_map_hash_slots, &linear_map_hash_lock);
 	}
 	local_irq_restore(flags);
 	return 0;
-- 
2.50.1


From 47dd2e63d42a7a1b0a9c374d3a236f58b97c19e6 Mon Sep 17 00:00:00 2001
From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Date: Fri, 18 Oct 2024 22:59:49 +0530
Subject: [PATCH 04/16] book3s64/hash: Disable debug_pagealloc if it requires
 more memory

Make size of the linear map to be allocated in RMA region to be of
ppc64_rma_size / 4. If debug_pagealloc requires more memory than that
then do not allocate any memory and disable debug_pagealloc.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/e1ef66f32a1fe63bcbb89d5c11d86c65beef5ded.1729271995.git.ritesh.list@gmail.com
---
 arch/powerpc/mm/book3s64/hash_utils.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index cc2eaa97982c..cffbb6499ac4 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -331,9 +331,19 @@ static unsigned long linear_map_hash_count;
 static DEFINE_RAW_SPINLOCK(linear_map_hash_lock);
 static inline void hash_debug_pagealloc_alloc_slots(void)
 {
+	unsigned long max_hash_count = ppc64_rma_size / 4;
+
 	if (!debug_pagealloc_enabled())
 		return;
 	linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
+	if (unlikely(linear_map_hash_count > max_hash_count)) {
+		pr_info("linear map size (%llu) greater than 4 times RMA region (%llu). Disabling debug_pagealloc\n",
+			((u64)linear_map_hash_count << PAGE_SHIFT),
+			ppc64_rma_size);
+		linear_map_hash_count = 0;
+		return;
+	}
+
 	linear_map_hash_slots = memblock_alloc_try_nid(
 			linear_map_hash_count, 1, MEMBLOCK_LOW_LIMIT,
 			ppc64_rma_size,	NUMA_NO_NODE);
@@ -344,7 +354,7 @@ static inline void hash_debug_pagealloc_alloc_slots(void)
 
 static inline void hash_debug_pagealloc_add_slot(phys_addr_t paddr, int slot)
 {
-	if (!debug_pagealloc_enabled())
+	if (!debug_pagealloc_enabled() || !linear_map_hash_count)
 		return;
 	if ((paddr >> PAGE_SHIFT) < linear_map_hash_count)
 		linear_map_hash_slots[paddr >> PAGE_SHIFT] = slot | 0x80;
@@ -356,6 +366,9 @@ static int hash_debug_pagealloc_map_pages(struct page *page, int numpages,
 	unsigned long flags, vaddr, lmi;
 	int i;
 
+	if (!debug_pagealloc_enabled() || !linear_map_hash_count)
+		return 0;
+
 	local_irq_save(flags);
 	for (i = 0; i < numpages; i++, page++) {
 		vaddr = (unsigned long)page_address(page);
-- 
2.50.1


From 8fec58f503b296af87ffca3898965e3054f2b616 Mon Sep 17 00:00:00 2001
From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Date: Fri, 18 Oct 2024 22:59:50 +0530
Subject: [PATCH 05/16] book3s64/hash: Add kfence functionality

Now that linear map functionality of debug_pagealloc is made generic,
enable kfence to use this generic infrastructure.

1. Define kfence related linear map variables.
   - u8 *linear_map_kf_hash_slots;
   - unsigned long linear_map_kf_hash_count;
   - DEFINE_RAW_SPINLOCK(linear_map_kf_hash_lock);
2. The linear map size allocated in RMA region is quite small
   (KFENCE_POOL_SIZE >> PAGE_SHIFT) which is 512 bytes by default.
3. kfence pool memory is reserved using memblock_phys_alloc() which has
   can come from anywhere.
   (default 255 objects => ((1+255) * 2) << PAGE_SHIFT = 32MB)
4. The hash slot information for kfence memory gets added in linear map
   in hash_linear_map_add_slot() (which also adds for debug_pagealloc).

Reported-by: Pavithra Prakash <pavrampu@linux.vnet.ibm.com>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/5c2b61941b344077a2b8654dab46efa0322af3af.1729271995.git.ritesh.list@gmail.com
---
 arch/powerpc/include/asm/kfence.h     |   5 -
 arch/powerpc/mm/book3s64/hash_utils.c | 162 +++++++++++++++++++++++---
 2 files changed, 149 insertions(+), 18 deletions(-)

diff --git a/arch/powerpc/include/asm/kfence.h b/arch/powerpc/include/asm/kfence.h
index f3a9476a71b3..fab124ada1c7 100644
--- a/arch/powerpc/include/asm/kfence.h
+++ b/arch/powerpc/include/asm/kfence.h
@@ -10,7 +10,6 @@
 
 #include <linux/mm.h>
 #include <asm/pgtable.h>
-#include <asm/mmu.h>
 
 #ifdef CONFIG_PPC64_ELF_ABI_V1
 #define ARCH_FUNC_PREFIX "."
@@ -26,10 +25,6 @@ static inline void disable_kfence(void)
 
 static inline bool arch_kfence_init_pool(void)
 {
-#ifdef CONFIG_PPC64
-	if (!radix_enabled())
-		return false;
-#endif
 	return !kfence_disabled;
 }
 #endif
diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index cffbb6499ac4..5bd87d4b3999 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -40,6 +40,7 @@
 #include <linux/random.h>
 #include <linux/elf-randomize.h>
 #include <linux/of_fdt.h>
+#include <linux/kfence.h>
 
 #include <asm/interrupt.h>
 #include <asm/processor.h>
@@ -66,6 +67,7 @@
 #include <asm/pte-walk.h>
 #include <asm/asm-prototypes.h>
 #include <asm/ultravisor.h>
+#include <asm/kfence.h>
 
 #include <mm/mmu_decl.h>
 
@@ -271,7 +273,7 @@ void hash__tlbiel_all(unsigned int action)
 		WARN(1, "%s called on pre-POWER7 CPU\n", __func__);
 }
 
-#ifdef CONFIG_DEBUG_PAGEALLOC
+#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KFENCE)
 static void kernel_map_linear_page(unsigned long vaddr, unsigned long idx,
 				   u8 *slots, raw_spinlock_t *lock)
 {
@@ -325,11 +327,13 @@ static void kernel_unmap_linear_page(unsigned long vaddr, unsigned long idx,
 				     mmu_linear_psize,
 				     mmu_kernel_ssize, 0);
 }
+#endif
 
+#ifdef CONFIG_DEBUG_PAGEALLOC
 static u8 *linear_map_hash_slots;
 static unsigned long linear_map_hash_count;
 static DEFINE_RAW_SPINLOCK(linear_map_hash_lock);
-static inline void hash_debug_pagealloc_alloc_slots(void)
+static void hash_debug_pagealloc_alloc_slots(void)
 {
 	unsigned long max_hash_count = ppc64_rma_size / 4;
 
@@ -352,7 +356,8 @@ static inline void hash_debug_pagealloc_alloc_slots(void)
 		      __func__, linear_map_hash_count, &ppc64_rma_size);
 }
 
-static inline void hash_debug_pagealloc_add_slot(phys_addr_t paddr, int slot)
+static inline void hash_debug_pagealloc_add_slot(phys_addr_t paddr,
+							int slot)
 {
 	if (!debug_pagealloc_enabled() || !linear_map_hash_count)
 		return;
@@ -386,20 +391,148 @@ static int hash_debug_pagealloc_map_pages(struct page *page, int numpages,
 	return 0;
 }
 
-int hash__kernel_map_pages(struct page *page, int numpages, int enable)
+#else /* CONFIG_DEBUG_PAGEALLOC */
+static inline void hash_debug_pagealloc_alloc_slots(void) {}
+static inline void hash_debug_pagealloc_add_slot(phys_addr_t paddr, int slot) {}
+static int __maybe_unused
+hash_debug_pagealloc_map_pages(struct page *page, int numpages, int enable)
 {
-	return hash_debug_pagealloc_map_pages(page, numpages, enable);
+	return 0;
 }
+#endif /* CONFIG_DEBUG_PAGEALLOC */
 
-#else /* CONFIG_DEBUG_PAGEALLOC */
-int hash__kernel_map_pages(struct page *page, int numpages,
-					 int enable)
+#ifdef CONFIG_KFENCE
+static u8 *linear_map_kf_hash_slots;
+static unsigned long linear_map_kf_hash_count;
+static DEFINE_RAW_SPINLOCK(linear_map_kf_hash_lock);
+
+static phys_addr_t kfence_pool;
+
+static inline void hash_kfence_alloc_pool(void)
+{
+
+	/* allocate linear map for kfence within RMA region */
+	linear_map_kf_hash_count = KFENCE_POOL_SIZE >> PAGE_SHIFT;
+	linear_map_kf_hash_slots = memblock_alloc_try_nid(
+					linear_map_kf_hash_count, 1,
+					MEMBLOCK_LOW_LIMIT, ppc64_rma_size,
+					NUMA_NO_NODE);
+	if (!linear_map_kf_hash_slots) {
+		pr_err("%s: memblock for linear map (%lu) failed\n", __func__,
+				linear_map_kf_hash_count);
+		goto err;
+	}
+
+	/* allocate kfence pool early */
+	kfence_pool = memblock_phys_alloc_range(KFENCE_POOL_SIZE, PAGE_SIZE,
+				MEMBLOCK_LOW_LIMIT, MEMBLOCK_ALLOC_ANYWHERE);
+	if (!kfence_pool) {
+		pr_err("%s: memblock for kfence pool (%lu) failed\n", __func__,
+				KFENCE_POOL_SIZE);
+		memblock_free(linear_map_kf_hash_slots,
+				linear_map_kf_hash_count);
+		linear_map_kf_hash_count = 0;
+		goto err;
+	}
+	memblock_mark_nomap(kfence_pool, KFENCE_POOL_SIZE);
+
+	return;
+err:
+	pr_info("Disabling kfence\n");
+	disable_kfence();
+}
+
+static inline void hash_kfence_map_pool(void)
+{
+	unsigned long kfence_pool_start, kfence_pool_end;
+	unsigned long prot = pgprot_val(PAGE_KERNEL);
+
+	if (!kfence_pool)
+		return;
+
+	kfence_pool_start = (unsigned long) __va(kfence_pool);
+	kfence_pool_end = kfence_pool_start + KFENCE_POOL_SIZE;
+	__kfence_pool = (char *) kfence_pool_start;
+	BUG_ON(htab_bolt_mapping(kfence_pool_start, kfence_pool_end,
+				    kfence_pool, prot, mmu_linear_psize,
+				    mmu_kernel_ssize));
+	memblock_clear_nomap(kfence_pool, KFENCE_POOL_SIZE);
+}
+
+static inline void hash_kfence_add_slot(phys_addr_t paddr, int slot)
 {
+	unsigned long vaddr = (unsigned long) __va(paddr);
+	unsigned long lmi = (vaddr - (unsigned long)__kfence_pool)
+					>> PAGE_SHIFT;
+
+	if (!kfence_pool)
+		return;
+	BUG_ON(!is_kfence_address((void *)vaddr));
+	BUG_ON(lmi >= linear_map_kf_hash_count);
+	linear_map_kf_hash_slots[lmi] = slot | 0x80;
+}
+
+static int hash_kfence_map_pages(struct page *page, int numpages, int enable)
+{
+	unsigned long flags, vaddr, lmi;
+	int i;
+
+	WARN_ON_ONCE(!linear_map_kf_hash_count);
+	local_irq_save(flags);
+	for (i = 0; i < numpages; i++, page++) {
+		vaddr = (unsigned long)page_address(page);
+		lmi = (vaddr - (unsigned long)__kfence_pool) >> PAGE_SHIFT;
+
+		/* Ideally this should never happen */
+		if (lmi >= linear_map_kf_hash_count) {
+			WARN_ON_ONCE(1);
+			continue;
+		}
+
+		if (enable)
+			kernel_map_linear_page(vaddr, lmi,
+					       linear_map_kf_hash_slots,
+					       &linear_map_kf_hash_lock);
+		else
+			kernel_unmap_linear_page(vaddr, lmi,
+						 linear_map_kf_hash_slots,
+						 &linear_map_kf_hash_lock);
+	}
+	local_irq_restore(flags);
 	return 0;
 }
-static inline void hash_debug_pagealloc_alloc_slots(void) {}
-static inline void hash_debug_pagealloc_add_slot(phys_addr_t paddr, int slot) {}
-#endif /* CONFIG_DEBUG_PAGEALLOC */
+#else
+static inline void hash_kfence_alloc_pool(void) {}
+static inline void hash_kfence_map_pool(void) {}
+static inline void hash_kfence_add_slot(phys_addr_t paddr, int slot) {}
+static int __maybe_unused
+hash_kfence_map_pages(struct page *page, int numpages, int enable)
+{
+	return 0;
+}
+#endif
+
+#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KFENCE)
+int hash__kernel_map_pages(struct page *page, int numpages, int enable)
+{
+	void *vaddr = page_address(page);
+
+	if (is_kfence_address(vaddr))
+		return hash_kfence_map_pages(page, numpages, enable);
+	else
+		return hash_debug_pagealloc_map_pages(page, numpages, enable);
+}
+
+static void hash_linear_map_add_slot(phys_addr_t paddr, int slot)
+{
+	if (is_kfence_address(__va(paddr)))
+		hash_kfence_add_slot(paddr, slot);
+	else
+		hash_debug_pagealloc_add_slot(paddr, slot);
+}
+#else
+static void hash_linear_map_add_slot(phys_addr_t paddr, int slot) {}
+#endif
 
 /*
  * 'R' and 'C' update notes:
@@ -559,7 +692,8 @@ repeat:
 			break;
 
 		cond_resched();
-		hash_debug_pagealloc_add_slot(paddr, ret);
+		/* add slot info in debug_pagealloc / kfence linear map */
+		hash_linear_map_add_slot(paddr, ret);
 	}
 	return ret < 0 ? ret : 0;
 }
@@ -940,7 +1074,7 @@ static void __init htab_init_page_sizes(void)
 	bool aligned = true;
 	init_hpte_page_sizes();
 
-	if (!debug_pagealloc_enabled()) {
+	if (!debug_pagealloc_enabled_or_kfence()) {
 		/*
 		 * Pick a size for the linear mapping. Currently, we only
 		 * support 16M, 1M and 4K which is the default
@@ -1261,6 +1395,7 @@ static void __init htab_initialize(void)
 	prot = pgprot_val(PAGE_KERNEL);
 
 	hash_debug_pagealloc_alloc_slots();
+	hash_kfence_alloc_pool();
 	/* create bolted the linear mapping in the hash table */
 	for_each_mem_range(i, &base, &end) {
 		size = end - base;
@@ -1277,6 +1412,7 @@ static void __init htab_initialize(void)
 		BUG_ON(htab_bolt_mapping(base, base + size, __pa(base),
 				prot, mmu_linear_psize, mmu_kernel_ssize));
 	}
+	hash_kfence_map_pool();
 	memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE);
 
 	/*
-- 
2.50.1


From b5fbf7e2c6a403344e83139a14322f0c42911f2d Mon Sep 17 00:00:00 2001
From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Date: Fri, 18 Oct 2024 22:59:51 +0530
Subject: [PATCH 06/16] book3s64/radix: Refactoring common kfence related
 functions

Both radix and hash on book3s requires to detect if kfence
early init is enabled or not. Hash needs to disable kfence
if early init is not enabled because with kfence the linear map is
mapped using PAGE_SIZE rather than 16M mapping.
We don't support multiple page sizes for slb entry used for kernel
linear map in book3s64.

This patch refactors out the common functions required to detect kfence
early init is enabled or not.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/f4a787224fbe5bb787158ace579780c0257f6602.1729271995.git.ritesh.list@gmail.com
---
 arch/powerpc/include/asm/kfence.h        |  8 ++++++--
 arch/powerpc/mm/book3s64/pgtable.c       | 13 +++++++++++++
 arch/powerpc/mm/book3s64/radix_pgtable.c | 12 ------------
 arch/powerpc/mm/init-common.c            |  1 +
 4 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/include/asm/kfence.h b/arch/powerpc/include/asm/kfence.h
index fab124ada1c7..1f7cab58ab2c 100644
--- a/arch/powerpc/include/asm/kfence.h
+++ b/arch/powerpc/include/asm/kfence.h
@@ -15,7 +15,7 @@
 #define ARCH_FUNC_PREFIX "."
 #endif
 
-#ifdef CONFIG_KFENCE
+extern bool kfence_early_init;
 extern bool kfence_disabled;
 
 static inline void disable_kfence(void)
@@ -27,7 +27,11 @@ static inline bool arch_kfence_init_pool(void)
 {
 	return !kfence_disabled;
 }
-#endif
+
+static inline bool kfence_early_init_enabled(void)
+{
+	return IS_ENABLED(CONFIG_KFENCE) && kfence_early_init;
+}
 
 #ifdef CONFIG_PPC64
 static inline bool kfence_protect_page(unsigned long addr, bool protect)
diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
index 5a4a75369043..374542528080 100644
--- a/arch/powerpc/mm/book3s64/pgtable.c
+++ b/arch/powerpc/mm/book3s64/pgtable.c
@@ -37,6 +37,19 @@ EXPORT_SYMBOL(__pmd_frag_nr);
 unsigned long __pmd_frag_size_shift;
 EXPORT_SYMBOL(__pmd_frag_size_shift);
 
+#ifdef CONFIG_KFENCE
+extern bool kfence_early_init;
+static int __init parse_kfence_early_init(char *arg)
+{
+	int val;
+
+	if (get_option(&arg, &val))
+		kfence_early_init = !!val;
+	return 0;
+}
+early_param("kfence.sample_interval", parse_kfence_early_init);
+#endif
+
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 /*
  * This is called when relaxing access to a hugepage. It's also called in the page
diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index b0d927009af8..311e2112d782 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -363,18 +363,6 @@ static int __meminit create_physical_mapping(unsigned long start,
 }
 
 #ifdef CONFIG_KFENCE
-static bool __ro_after_init kfence_early_init = !!CONFIG_KFENCE_SAMPLE_INTERVAL;
-
-static int __init parse_kfence_early_init(char *arg)
-{
-	int val;
-
-	if (get_option(&arg, &val))
-		kfence_early_init = !!val;
-	return 0;
-}
-early_param("kfence.sample_interval", parse_kfence_early_init);
-
 static inline phys_addr_t alloc_kfence_pool(void)
 {
 	phys_addr_t kfence_pool;
diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c
index 2978fcbe307e..745097554bea 100644
--- a/arch/powerpc/mm/init-common.c
+++ b/arch/powerpc/mm/init-common.c
@@ -33,6 +33,7 @@ bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP);
 bool disable_kuap = !IS_ENABLED(CONFIG_PPC_KUAP);
 #ifdef CONFIG_KFENCE
 bool __ro_after_init kfence_disabled;
+bool __ro_after_init kfence_early_init = !!CONFIG_KFENCE_SAMPLE_INTERVAL;
 #endif
 
 static int __init parse_nosmep(char *p)
-- 
2.50.1


From 76b7d6463fc504ac266472f5948b83902dfca4c6 Mon Sep 17 00:00:00 2001
From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Date: Fri, 18 Oct 2024 22:59:52 +0530
Subject: [PATCH 07/16] book3s64/hash: Disable kfence if not early init

Enable kfence on book3s64 hash only when early init is enabled.
This is because, kfence could cause the kernel linear map to be mapped
at PAGE_SIZE level instead of 16M (which I guess we don't want).

Also currently there is no way to -
1. Make multiple page size entries for the SLB used for kernel linear
   map.
2. No easy way of getting the hash slot details after the page table
   mapping for kernel linear setup. So even if kfence allocate the
   pool in late init, we won't be able to get the hash slot details in
   kfence linear map.

Thus this patch disables kfence on hash if kfence early init is not
enabled.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/4a6eea8cfd1cd28fccfae067026bff30cbec1d4b.1729271995.git.ritesh.list@gmail.com
---
 arch/powerpc/mm/book3s64/hash_utils.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index 5bd87d4b3999..d6683903fefb 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -410,6 +410,8 @@ static phys_addr_t kfence_pool;
 
 static inline void hash_kfence_alloc_pool(void)
 {
+	if (!kfence_early_init_enabled())
+		goto err;
 
 	/* allocate linear map for kfence within RMA region */
 	linear_map_kf_hash_count = KFENCE_POOL_SIZE >> PAGE_SHIFT;
@@ -1074,7 +1076,7 @@ static void __init htab_init_page_sizes(void)
 	bool aligned = true;
 	init_hpte_page_sizes();
 
-	if (!debug_pagealloc_enabled_or_kfence()) {
+	if (!debug_pagealloc_enabled() && !kfence_early_init_enabled()) {
 		/*
 		 * Pick a size for the linear mapping. Currently, we only
 		 * support 16M, 1M and 4K which is the default
-- 
2.50.1


From 8846d9683884fa9ef5bb160011a748701216e186 Mon Sep 17 00:00:00 2001
From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Date: Fri, 18 Oct 2024 22:59:53 +0530
Subject: [PATCH 08/16] book3s64/hash: Early detect debug_pagealloc size
 requirement

Add hash_supports_debug_pagealloc() helper to detect whether
debug_pagealloc can be supported on hash or not. This checks for both,
whether debug_pagealloc config is enabled and the linear map should
fit within rma_size/4 region size.

This can then be used early during htab_init_page_sizes() to decide
linear map pagesize if hash supports either debug_pagealloc or
kfence.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/c33c6691b2a2cf619cc74ac100118ca4dbf21a48.1729271995.git.ritesh.list@gmail.com
---
 arch/powerpc/mm/book3s64/hash_utils.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index d6683903fefb..db87c2cc2fb6 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -329,25 +329,26 @@ static void kernel_unmap_linear_page(unsigned long vaddr, unsigned long idx,
 }
 #endif
 
+static inline bool hash_supports_debug_pagealloc(void)
+{
+	unsigned long max_hash_count = ppc64_rma_size / 4;
+	unsigned long linear_map_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
+
+	if (!debug_pagealloc_enabled() || linear_map_count > max_hash_count)
+		return false;
+	return true;
+}
+
 #ifdef CONFIG_DEBUG_PAGEALLOC
 static u8 *linear_map_hash_slots;
 static unsigned long linear_map_hash_count;
 static DEFINE_RAW_SPINLOCK(linear_map_hash_lock);
 static void hash_debug_pagealloc_alloc_slots(void)
 {
-	unsigned long max_hash_count = ppc64_rma_size / 4;
-
-	if (!debug_pagealloc_enabled())
-		return;
-	linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
-	if (unlikely(linear_map_hash_count > max_hash_count)) {
-		pr_info("linear map size (%llu) greater than 4 times RMA region (%llu). Disabling debug_pagealloc\n",
-			((u64)linear_map_hash_count << PAGE_SHIFT),
-			ppc64_rma_size);
-		linear_map_hash_count = 0;
+	if (!hash_supports_debug_pagealloc())
 		return;
-	}
 
+	linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
 	linear_map_hash_slots = memblock_alloc_try_nid(
 			linear_map_hash_count, 1, MEMBLOCK_LOW_LIMIT,
 			ppc64_rma_size,	NUMA_NO_NODE);
@@ -1076,7 +1077,7 @@ static void __init htab_init_page_sizes(void)
 	bool aligned = true;
 	init_hpte_page_sizes();
 
-	if (!debug_pagealloc_enabled() && !kfence_early_init_enabled()) {
+	if (!hash_supports_debug_pagealloc() && !kfence_early_init_enabled()) {
 		/*
 		 * Pick a size for the linear mapping. Currently, we only
 		 * support 16M, 1M and 4K which is the default
-- 
2.50.1


From 46e1879deea22eed31e9425d58635895fc0e8040 Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <nathan@kernel.org>
Date: Wed, 9 Oct 2024 12:26:08 -0700
Subject: [PATCH 09/16] powerpc: Fix stack protector Kconfig test for clang

Clang's in-progress per-task stack protector support [1] does not work
with the current Kconfig checks because '-mstack-protector-guard-offset'
is not provided, unlike all other architecture Kconfig checks.

  $ fd Kconfig -x rg -l mstack-protector-guard-offset
  ./arch/arm/Kconfig
  ./arch/riscv/Kconfig
  ./arch/arm64/Kconfig

This produces an error from clang, which is interpreted as the flags not
being supported at all when they really are.

  $ clang --target=powerpc64-linux-gnu \
          -mstack-protector-guard=tls \
          -mstack-protector-guard-reg=r13 \
          -c -o /dev/null -x c /dev/null
  clang: error: '-mstack-protector-guard=tls' is used without '-mstack-protector-guard-offset', and there is no default

This argument will always be provided by the build system, so mirror
other architectures and use '-mstack-protector-guard-offset=0' for
testing support, which fixes the issue for clang and does not regress
support with GCC.

Even with the first problem addressed, the 32-bit test continues to fail
because Kbuild uses the powerpc64le-linux-gnu target for clang and
nothing flips the target to 32-bit, resulting in an error about an
invalid register valid:

  $ clang --target=powerpc64le-linux-gnu \
          -mstack-protector-guard=tls
          -mstack-protector-guard-reg=r2 \
          -mstack-protector-guard-offset=0 \
          -x c -c -o /dev/null /dev/null
  clang: error: invalid value 'r2' in 'mstack-protector-guard-reg=', expected one of: r13

While GCC allows arbitrary registers, the implementation of
'-mstack-protector-guard=tls' in LLVM shares the same code path as the
user space thread local storage implementation, which uses a fixed
register (2 for 32-bit and 13 for 62-bit), so the command line parsing
enforces this limitation.

Use the Kconfig macro '$(m32-flag)', which expands to '-m32' when
supported, in the stack protector support cc-option call to properly
switch the target to a 32-bit one, which matches what happens in Kbuild.
While the 64-bit macro does not strictly need it, add the equivalent
64-bit option for symmetry.

Cc: stable@vger.kernel.org # 6.1+
Link: https://github.com/llvm/llvm-project/pull/110928 [1]
Reviewed-by: Keith Packard <keithp@keithp.com>
Tested-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241009-powerpc-fix-stackprotector-test-clang-v2-1-12fb86b31857@kernel.org
---
 arch/powerpc/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 8094a01974cc..6aaca48955a3 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -275,8 +275,8 @@ config PPC
 	select HAVE_RSEQ
 	select HAVE_SETUP_PER_CPU_AREA		if PPC64
 	select HAVE_SOFTIRQ_ON_OWN_STACK
-	select HAVE_STACKPROTECTOR		if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
-	select HAVE_STACKPROTECTOR		if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
+	select HAVE_STACKPROTECTOR		if PPC32 && $(cc-option,$(m32-flag) -mstack-protector-guard=tls -mstack-protector-guard-reg=r2 -mstack-protector-guard-offset=0)
+	select HAVE_STACKPROTECTOR		if PPC64 && $(cc-option,$(m64-flag) -mstack-protector-guard=tls -mstack-protector-guard-reg=r13 -mstack-protector-guard-offset=0)
 	select HAVE_STATIC_CALL			if PPC32
 	select HAVE_SYSCALL_TRACEPOINTS
 	select HAVE_VIRT_CPU_ACCOUNTING
-- 
2.50.1


From bee08a9e6ab03caf14481d97b35a258400ffab8f Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <nathan@kernel.org>
Date: Wed, 9 Oct 2024 12:26:09 -0700
Subject: [PATCH 10/16] powerpc: Adjust adding stack protector flags to
 KBUILD_CLAGS for clang

After fixing the HAVE_STACKPROTECTER checks for clang's in-progress
per-task stack protector support [1], the build fails during prepare0
because '-mstack-protector-guard-offset' has not been added to
KBUILD_CFLAGS yet but the other '-mstack-protector-guard' flags have.

  clang: error: '-mstack-protector-guard=tls' is used without '-mstack-protector-guard-offset', and there is no default
  clang: error: '-mstack-protector-guard=tls' is used without '-mstack-protector-guard-offset', and there is no default
  make[4]: *** [scripts/Makefile.build:229: scripts/mod/empty.o] Error 1
  make[4]: *** [scripts/Makefile.build:102: scripts/mod/devicetable-offsets.s] Error 1

Mirror other architectures and add all '-mstack-protector-guard' flags
to KBUILD_CFLAGS atomically during stack_protector_prepare, which
resolves the issue and allows clang's implementation to fully work with
the kernel.

Cc: stable@vger.kernel.org # 6.1+
Link: https://github.com/llvm/llvm-project/pull/110928 [1]
Reviewed-by: Keith Packard <keithp@keithp.com>
Tested-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241009-powerpc-fix-stackprotector-test-clang-v2-2-12fb86b31857@kernel.org
---
 arch/powerpc/Makefile | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index bbfe4a1f06ef..cbb353ddacb7 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -100,13 +100,6 @@ KBUILD_AFLAGS	+= -m$(BITS)
 KBUILD_LDFLAGS	+= -m elf$(BITS)$(LDEMULATION)
 endif
 
-cflags-$(CONFIG_STACKPROTECTOR)	+= -mstack-protector-guard=tls
-ifdef CONFIG_PPC64
-cflags-$(CONFIG_STACKPROTECTOR)	+= -mstack-protector-guard-reg=r13
-else
-cflags-$(CONFIG_STACKPROTECTOR)	+= -mstack-protector-guard-reg=r2
-endif
-
 LDFLAGS_vmlinux-y := -Bstatic
 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
@@ -402,9 +395,11 @@ prepare: stack_protector_prepare
 PHONY += stack_protector_prepare
 stack_protector_prepare: prepare0
 ifdef CONFIG_PPC64
-	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
+	$(eval KBUILD_CFLAGS += -mstack-protector-guard=tls -mstack-protector-guard-reg=r13 \
+				-mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
 else
-	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
+	$(eval KBUILD_CFLAGS += -mstack-protector-guard=tls -mstack-protector-guard-reg=r2 \
+				-mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
 endif
 endif
 
-- 
2.50.1


From 5e296fc37e1afa3fb38b886fe2bf7737777d0f61 Mon Sep 17 00:00:00 2001
From: Michael Ellerman <mpe@ellerman.id.au>
Date: Wed, 9 Oct 2024 16:17:00 +1100
Subject: [PATCH 11/16] powerpc/64: Drop IPI_PRIORITY from asm-offsets

The last use of IPI_PRIORITY in asm was removed in commit 37f55d30df2e
("KVM: PPC: Book3S HV: Convert kvmppc_read_intr to a C function").

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241009051701.132282-1-mpe@ellerman.id.au
---
 arch/powerpc/kernel/asm-offsets.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 7b3feb6bc210..d8fe97662a02 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -596,7 +596,6 @@ int main(void)
 	HSTATE_FIELD(HSTATE_DABR, dabr);
 	HSTATE_FIELD(HSTATE_DECEXP, dec_expires);
 	HSTATE_FIELD(HSTATE_SPLIT_MODE, kvm_split_mode);
-	DEFINE(IPI_PRIORITY, IPI_PRIORITY);
 	OFFSET(KVM_SPLIT_RPR, kvm_split_mode, rpr);
 	OFFSET(KVM_SPLIT_PMMAR, kvm_split_mode, pmmar);
 	OFFSET(KVM_SPLIT_LDBAR, kvm_split_mode, ldbar);
-- 
2.50.1


From 3c9670df7f7e871f0d2c2208d2ce79f6cfbca0f6 Mon Sep 17 00:00:00 2001
From: Michael Ellerman <mpe@ellerman.id.au>
Date: Wed, 9 Oct 2024 16:18:25 +1100
Subject: [PATCH 12/16] powerpc/machdep: Drop include of seq_file.h

Drop the include of seq_file.h in machdep.h, replace it with a forward
declaration of struct seq_file, which is all that's required.

Add direct includes of seq_file.h to some files that were getting
seq_file.h via machdep.h.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241009051826.132805-1-mpe@ellerman.id.au
---
 arch/powerpc/include/asm/machdep.h               | 2 +-
 arch/powerpc/platforms/52xx/efika.c              | 1 +
 arch/powerpc/platforms/embedded6xx/linkstation.c | 1 +
 arch/powerpc/platforms/embedded6xx/mvme5100.c    | 1 +
 arch/powerpc/platforms/pseries/lpar.c            | 1 +
 arch/powerpc/platforms/pseries/msi.c             | 1 +
 arch/powerpc/platforms/pseries/papr_scm.c        | 1 +
 arch/powerpc/sysdev/xive/spapr.c                 | 1 +
 8 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index 1862f94335ee..3326730cd300 100644
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -4,7 +4,6 @@
 #ifdef __KERNEL__
 
 #include <linux/compiler.h>
-#include <linux/seq_file.h>
 #include <linux/init.h>
 #include <linux/dma-mapping.h>
 #include <linux/export.h>
@@ -18,6 +17,7 @@ struct file;
 struct pci_controller;
 struct kimage;
 struct pci_host_bridge;
+struct seq_file;
 
 struct machdep_calls {
 	const char	*name;
diff --git a/arch/powerpc/platforms/52xx/efika.c b/arch/powerpc/platforms/52xx/efika.c
index 37a67120f257..a7172f9ebaad 100644
--- a/arch/powerpc/platforms/52xx/efika.c
+++ b/arch/powerpc/platforms/52xx/efika.c
@@ -13,6 +13,7 @@
 #include <generated/utsrelease.h>
 #include <linux/pci.h>
 #include <linux/of.h>
+#include <linux/seq_file.h>
 #include <asm/dma.h>
 #include <asm/time.h>
 #include <asm/machdep.h>
diff --git a/arch/powerpc/platforms/embedded6xx/linkstation.c b/arch/powerpc/platforms/embedded6xx/linkstation.c
index e265f026eee2..4012f206ec63 100644
--- a/arch/powerpc/platforms/embedded6xx/linkstation.c
+++ b/arch/powerpc/platforms/embedded6xx/linkstation.c
@@ -13,6 +13,7 @@
 #include <linux/kernel.h>
 #include <linux/initrd.h>
 #include <linux/of_platform.h>
+#include <linux/seq_file.h>
 
 #include <asm/time.h>
 #include <asm/mpic.h>
diff --git a/arch/powerpc/platforms/embedded6xx/mvme5100.c b/arch/powerpc/platforms/embedded6xx/mvme5100.c
index 00bec0f051be..5ca41972ef22 100644
--- a/arch/powerpc/platforms/embedded6xx/mvme5100.c
+++ b/arch/powerpc/platforms/embedded6xx/mvme5100.c
@@ -14,6 +14,7 @@
 
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
+#include <linux/seq_file.h>
 
 #include <asm/i8259.h>
 #include <asm/pci-bridge.h>
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index c1d8bee8f701..0c428f1ae712 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -16,6 +16,7 @@
 #include <linux/export.h>
 #include <linux/jump_label.h>
 #include <linux/delay.h>
+#include <linux/seq_file.h>
 #include <linux/stop_machine.h>
 #include <linux/spinlock.h>
 #include <linux/cpuhotplug.h>
diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c
index 6dfb55b52d36..fdc2f7f38dc9 100644
--- a/arch/powerpc/platforms/pseries/msi.c
+++ b/arch/powerpc/platforms/pseries/msi.c
@@ -9,6 +9,7 @@
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/msi.h>
+#include <linux/seq_file.h>
 
 #include <asm/rtas.h>
 #include <asm/hw_irq.h>
diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
index 9e297f88adc5..f84ac9fbe203 100644
--- a/arch/powerpc/platforms/pseries/papr_scm.c
+++ b/arch/powerpc/platforms/pseries/papr_scm.c
@@ -6,6 +6,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/ioport.h>
+#include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/ndctl.h>
 #include <linux/sched.h>
diff --git a/arch/powerpc/sysdev/xive/spapr.c b/arch/powerpc/sysdev/xive/spapr.c
index f2fa985a2c77..5aedbe3e8e6a 100644
--- a/arch/powerpc/sysdev/xive/spapr.c
+++ b/arch/powerpc/sysdev/xive/spapr.c
@@ -7,6 +7,7 @@
 
 #include <linux/types.h>
 #include <linux/irq.h>
+#include <linux/seq_file.h>
 #include <linux/smp.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
-- 
2.50.1


From b23b9edf64b6387334aa2f8687cca6792b0d9d6c Mon Sep 17 00:00:00 2001
From: Michael Ellerman <mpe@ellerman.id.au>
Date: Wed, 9 Oct 2024 16:18:26 +1100
Subject: [PATCH 13/16] powerpc/machdep: Drop include of dma-mapping.h

Drop the include of dma-mapping.h in machdep.h, replace it with forward
declarations of struct device and struct pci_dev, and include time64.h
and page.h which are required for time64_t and pgprot_t respectively.

Add direct includes of some other headers to some files that were
getting them via machdep.h.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241009051826.132805-2-mpe@ellerman.id.au
---
 arch/powerpc/include/asm/machdep.h   | 6 +++++-
 arch/powerpc/kernel/sysfs.c          | 1 +
 arch/powerpc/platforms/pseries/svm.c | 1 +
 drivers/cpuidle/cpuidle-pseries.c    | 1 +
 4 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index 3326730cd300..3298eec123a3 100644
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -5,15 +5,19 @@
 
 #include <linux/compiler.h>
 #include <linux/init.h>
-#include <linux/dma-mapping.h>
 #include <linux/export.h>
+#include <linux/time64.h>
+
+#include <asm/page.h>
 
 struct pt_regs;
 struct pci_bus;
+struct device;
 struct device_node;
 struct iommu_table;
 struct rtc_time;
 struct file;
+struct pci_dev;
 struct pci_controller;
 struct kimage;
 struct pci_host_bridge;
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index b842c83ab497..6b3dd6decdf9 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -17,6 +17,7 @@
 #include <asm/hvcall.h>
 #include <asm/machdep.h>
 #include <asm/smp.h>
+#include <asm/time.h>
 #include <asm/pmc.h>
 #include <asm/firmware.h>
 #include <asm/idle.h>
diff --git a/arch/powerpc/platforms/pseries/svm.c b/arch/powerpc/platforms/pseries/svm.c
index 3b4045d508ec..10b8eb6bff39 100644
--- a/arch/powerpc/platforms/pseries/svm.c
+++ b/arch/powerpc/platforms/pseries/svm.c
@@ -9,6 +9,7 @@
 #include <linux/mm.h>
 #include <linux/memblock.h>
 #include <linux/cc_platform.h>
+#include <linux/mem_encrypt.h>
 #include <asm/machdep.h>
 #include <asm/svm.h>
 #include <asm/swiotlb.h>
diff --git a/drivers/cpuidle/cpuidle-pseries.c b/drivers/cpuidle/cpuidle-pseries.c
index 14db9b7d985d..f68c65f1d023 100644
--- a/drivers/cpuidle/cpuidle-pseries.c
+++ b/drivers/cpuidle/cpuidle-pseries.c
@@ -22,6 +22,7 @@
 #include <asm/idle.h>
 #include <asm/plpar_wrappers.h>
 #include <asm/rtas.h>
+#include <asm/time.h>
 
 static struct cpuidle_driver pseries_idle_driver = {
 	.name             = "pseries_idle",
-- 
2.50.1


From cadae3a45d23aa4f6485938a67cbc47aaaa25e38 Mon Sep 17 00:00:00 2001
From: Michael Ellerman <mpe@ellerman.id.au>
Date: Mon, 19 Aug 2024 22:24:01 +1000
Subject: [PATCH 14/16] powerpc/pseries: Fix dtl_access_lock to be a
 rw_semaphore

The dtl_access_lock needs to be a rw_sempahore, a sleeping lock, because
the code calls kmalloc() while holding it, which can sleep:

  # echo 1 > /proc/powerpc/vcpudispatch_stats
  BUG: sleeping function called from invalid context at include/linux/sched/mm.h:337
  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 199, name: sh
  preempt_count: 1, expected: 0
  3 locks held by sh/199:
   #0: c00000000a0743f8 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x324/0x438
   #1: c0000000028c7058 (dtl_enable_mutex){+.+.}-{3:3}, at: vcpudispatch_stats_write+0xd4/0x5f4
   #2: c0000000028c70b8 (dtl_access_lock){+.+.}-{2:2}, at: vcpudispatch_stats_write+0x220/0x5f4
  CPU: 0 PID: 199 Comm: sh Not tainted 6.10.0-rc4 #152
  Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1202 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries
  Call Trace:
    dump_stack_lvl+0x130/0x148 (unreliable)
    __might_resched+0x174/0x410
    kmem_cache_alloc_noprof+0x340/0x3d0
    alloc_dtl_buffers+0x124/0x1ac
    vcpudispatch_stats_write+0x2a8/0x5f4
    proc_reg_write+0xf4/0x150
    vfs_write+0xfc/0x438
    ksys_write+0x88/0x148
    system_call_exception+0x1c4/0x5a0
    system_call_common+0xf4/0x258

Fixes: 06220d78f24a ("powerpc/pseries: Introduce rwlock to gatekeep DTLB usage")
Tested-by: Kajol Jain <kjain@linux.ibm.com>
Reviewed-by: Nysal Jan K.A <nysal@linux.ibm.com>
Reviewed-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20240819122401.513203-1-mpe@ellerman.id.au
---
 arch/powerpc/include/asm/dtl.h        | 4 ++--
 arch/powerpc/platforms/pseries/dtl.c  | 8 ++++----
 arch/powerpc/platforms/pseries/lpar.c | 8 ++++----
 3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/include/asm/dtl.h b/arch/powerpc/include/asm/dtl.h
index d6f43d149f8d..a5c21bc623cb 100644
--- a/arch/powerpc/include/asm/dtl.h
+++ b/arch/powerpc/include/asm/dtl.h
@@ -1,8 +1,8 @@
 #ifndef _ASM_POWERPC_DTL_H
 #define _ASM_POWERPC_DTL_H
 
+#include <linux/rwsem.h>
 #include <asm/lppaca.h>
-#include <linux/spinlock_types.h>
 
 /*
  * Layout of entries in the hypervisor's dispatch trace log buffer.
@@ -35,7 +35,7 @@ struct dtl_entry {
 #define DTL_LOG_ALL		(DTL_LOG_CEDE | DTL_LOG_PREEMPT | DTL_LOG_FAULT)
 
 extern struct kmem_cache *dtl_cache;
-extern rwlock_t dtl_access_lock;
+extern struct rw_semaphore dtl_access_lock;
 
 extern void register_dtl_buffer(int cpu);
 extern void alloc_dtl_buffers(unsigned long *time_limit);
diff --git a/arch/powerpc/platforms/pseries/dtl.c b/arch/powerpc/platforms/pseries/dtl.c
index 8cb9d36ea491..f293588b8c7b 100644
--- a/arch/powerpc/platforms/pseries/dtl.c
+++ b/arch/powerpc/platforms/pseries/dtl.c
@@ -191,7 +191,7 @@ static int dtl_enable(struct dtl *dtl)
 		return -EBUSY;
 
 	/* ensure there are no other conflicting dtl users */
-	if (!read_trylock(&dtl_access_lock))
+	if (!down_read_trylock(&dtl_access_lock))
 		return -EBUSY;
 
 	n_entries = dtl_buf_entries;
@@ -199,7 +199,7 @@ static int dtl_enable(struct dtl *dtl)
 	if (!buf) {
 		printk(KERN_WARNING "%s: buffer alloc failed for cpu %d\n",
 				__func__, dtl->cpu);
-		read_unlock(&dtl_access_lock);
+		up_read(&dtl_access_lock);
 		return -ENOMEM;
 	}
 
@@ -217,7 +217,7 @@ static int dtl_enable(struct dtl *dtl)
 	spin_unlock(&dtl->lock);
 
 	if (rc) {
-		read_unlock(&dtl_access_lock);
+		up_read(&dtl_access_lock);
 		kmem_cache_free(dtl_cache, buf);
 	}
 
@@ -232,7 +232,7 @@ static void dtl_disable(struct dtl *dtl)
 	dtl->buf = NULL;
 	dtl->buf_entries = 0;
 	spin_unlock(&dtl->lock);
-	read_unlock(&dtl_access_lock);
+	up_read(&dtl_access_lock);
 }
 
 /* file interface */
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 0c428f1ae712..6a415febc53b 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -170,7 +170,7 @@ struct vcpu_dispatch_data {
  */
 #define NR_CPUS_H	NR_CPUS
 
-DEFINE_RWLOCK(dtl_access_lock);
+DECLARE_RWSEM(dtl_access_lock);
 static DEFINE_PER_CPU(struct vcpu_dispatch_data, vcpu_disp_data);
 static DEFINE_PER_CPU(u64, dtl_entry_ridx);
 static DEFINE_PER_CPU(struct dtl_worker, dtl_workers);
@@ -464,7 +464,7 @@ static int dtl_worker_enable(unsigned long *time_limit)
 {
 	int rc = 0, state;
 
-	if (!write_trylock(&dtl_access_lock)) {
+	if (!down_write_trylock(&dtl_access_lock)) {
 		rc = -EBUSY;
 		goto out;
 	}
@@ -480,7 +480,7 @@ static int dtl_worker_enable(unsigned long *time_limit)
 		pr_err("vcpudispatch_stats: unable to setup workqueue for DTL processing\n");
 		free_dtl_buffers(time_limit);
 		reset_global_dtl_mask();
-		write_unlock(&dtl_access_lock);
+		up_write(&dtl_access_lock);
 		rc = -EINVAL;
 		goto out;
 	}
@@ -495,7 +495,7 @@ static void dtl_worker_disable(unsigned long *time_limit)
 	cpuhp_remove_state(dtl_worker_state);
 	free_dtl_buffers(time_limit);
 	reset_global_dtl_mask();
-	write_unlock(&dtl_access_lock);
+	up_write(&dtl_access_lock);
 }
 
 static ssize_t vcpudispatch_stats_write(struct file *file, const char __user *p,
-- 
2.50.1


From c7182a0bdec16cdea912b5a3aea9a80f4f657b7d Mon Sep 17 00:00:00 2001
From: Michael Ellerman <mpe@ellerman.id.au>
Date: Wed, 9 Oct 2024 16:38:06 +1100
Subject: [PATCH 15/16] powerpc/boot: Remove bogus reference to lilo

The help text refers to lilo, but the install script does not run lilo
and never has. The reference to lilo seems to have come originally from
arch/ppc/Makefile, but it was not true there either.

Remove it.

Reported-by: Thorsten Leemhuis <linux@leemhuis.info>
Link: https://fosstodon.org/@kernellogger/113032940928131612
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241009053806.135807-1-mpe@ellerman.id.au
---
 arch/powerpc/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index cbb353ddacb7..1c5c28d58e94 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -352,7 +352,7 @@ define archhelp
   echo '  install         - Install kernel using'
   echo '                    (your) ~/bin/$(INSTALLKERNEL) or'
   echo '                    (distribution) /sbin/$(INSTALLKERNEL) or'
-  echo '                    install to $$(INSTALL_PATH) and run lilo'
+  echo '                    install to $$(INSTALL_PATH)'
   echo '  *_defconfig     - Select default config from arch/powerpc/configs'
   echo ''
   echo '  Targets with <dt> embed a device tree blob inside the image'
-- 
2.50.1


From 62f8f307c80e99ab18d38aa1a5bbbc18128ee5f8 Mon Sep 17 00:00:00 2001
From: Michael Ellerman <mpe@ellerman.id.au>
Date: Sun, 13 Oct 2024 21:29:57 +1100
Subject: [PATCH 16/16] powerpc/64: Remove maple platform

The maple platform was added in 2004 [1], to support the "Maple" 970FX
evaluation board.

It was later used for IBM JS20/JS21 machines, as well as the Bimini
machine, aka "Yellow Dog Powerstation".

Sadly all those machines have passed into memory, and there's been no
evidence for years that anyone is still using any of them.

Remove the platform and related code. It can always be reinstated if
there's interest.

Note that this has no impact on support for 970FX based Power Macs.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux-fullhistory.git/commit/?id=f0d068d65c5e555ffcfbc189de32598f6f00770c

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241013102957.548291-1-mpe@ellerman.id.au
---
 Documentation/arch/powerpc/booting.rst |   4 +-
 arch/powerpc/Kconfig.debug             |   6 -
 arch/powerpc/boot/.gitignore           |   1 -
 arch/powerpc/boot/Makefile             |   3 +-
 arch/powerpc/boot/wrapper              |   7 +-
 arch/powerpc/configs/maple_defconfig   | 111 ----
 arch/powerpc/configs/ppc64_defconfig   |   1 -
 arch/powerpc/include/asm/udbg.h        |   1 -
 arch/powerpc/kernel/misc_64.S          |   8 +-
 arch/powerpc/kernel/prom_init.c        |  86 ----
 arch/powerpc/kernel/udbg.c             |   3 -
 arch/powerpc/kernel/udbg_16550.c       |  23 -
 arch/powerpc/platforms/Kconfig         |   1 -
 arch/powerpc/platforms/Makefile        |   1 -
 arch/powerpc/platforms/maple/Kconfig   |  19 -
 arch/powerpc/platforms/maple/Makefile  |   2 -
 arch/powerpc/platforms/maple/maple.h   |  14 -
 arch/powerpc/platforms/maple/pci.c     | 672 -------------------------
 arch/powerpc/platforms/maple/setup.c   | 363 -------------
 arch/powerpc/platforms/maple/time.c    | 170 -------
 20 files changed, 8 insertions(+), 1488 deletions(-)
 delete mode 100644 arch/powerpc/configs/maple_defconfig
 delete mode 100644 arch/powerpc/platforms/maple/Kconfig
 delete mode 100644 arch/powerpc/platforms/maple/Makefile
 delete mode 100644 arch/powerpc/platforms/maple/maple.h
 delete mode 100644 arch/powerpc/platforms/maple/pci.c
 delete mode 100644 arch/powerpc/platforms/maple/setup.c
 delete mode 100644 arch/powerpc/platforms/maple/time.c

diff --git a/Documentation/arch/powerpc/booting.rst b/Documentation/arch/powerpc/booting.rst
index 11aa440f98cc..472e97891aef 100644
--- a/Documentation/arch/powerpc/booting.rst
+++ b/Documentation/arch/powerpc/booting.rst
@@ -93,8 +93,8 @@ given platform based on the content of the device-tree. Thus, you
 should:
 
         a) add your platform support as a _boolean_ option in
-        arch/powerpc/Kconfig, following the example of PPC_PSERIES,
-        PPC_PMAC and PPC_MAPLE. The latter is probably a good
+        arch/powerpc/Kconfig, following the example of PPC_PSERIES
+        and PPC_PMAC. The latter is probably a good
         example of a board support to start from.
 
         b) create your main platform file as
diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index 0bbec4afc0d5..20d05605fa83 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -223,12 +223,6 @@ config PPC_EARLY_DEBUG_RTAS_CONSOLE
 	help
 	  Select this to enable early debugging via the RTAS console.
 
-config PPC_EARLY_DEBUG_MAPLE
-	bool "Maple real mode"
-	depends on PPC_MAPLE
-	help
-	  Select this to enable early debugging for Maple.
-
 config PPC_EARLY_DEBUG_PAS_REALMODE
 	bool "PA Semi real mode"
 	depends on PPC_PASEMI
diff --git a/arch/powerpc/boot/.gitignore b/arch/powerpc/boot/.gitignore
index a4716d138cfc..5a867f23fe7f 100644
--- a/arch/powerpc/boot/.gitignore
+++ b/arch/powerpc/boot/.gitignore
@@ -30,7 +30,6 @@ zImage.coff
 zImage.epapr
 zImage.holly
 zImage.*lds
-zImage.maple
 zImage.miboot
 zImage.pmac
 zImage.pseries
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index fa8518067d38..1ff6ad4f6cd2 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -276,7 +276,6 @@ quiet_cmd_wrap	= WRAP    $@
 
 image-$(CONFIG_PPC_PSERIES)		+= zImage.pseries
 image-$(CONFIG_PPC_POWERNV)		+= zImage.pseries
-image-$(CONFIG_PPC_MAPLE)		+= zImage.maple
 image-$(CONFIG_PPC_IBM_CELL_BLADE)	+= zImage.pseries
 image-$(CONFIG_PPC_PS3)			+= dtbImage.ps3
 image-$(CONFIG_PPC_CHRP)		+= zImage.chrp
@@ -444,7 +443,7 @@ $(obj)/zImage.initrd:	$(addprefix $(obj)/, $(initrd-y))
 clean-files += $(image-) $(initrd-) cuImage.* dtbImage.* treeImage.* \
 	zImage zImage.initrd zImage.chrp zImage.coff zImage.holly \
 	zImage.miboot zImage.pmac zImage.pseries \
-	zImage.maple simpleImage.* otheros.bld
+	simpleImage.* otheros.bld
 
 # clean up files cached by wrapper
 clean-kernel-base := vmlinux.strip vmlinux.bin
diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
index b1f5549a3c9c..1db60fe13802 100755
--- a/arch/powerpc/boot/wrapper
+++ b/arch/powerpc/boot/wrapper
@@ -271,11 +271,6 @@ pseries)
     fi
     make_space=n
     ;;
-maple)
-    platformo="$object/of.o $object/epapr.o"
-    link_address='0x400000'
-    make_space=n
-    ;;
 pmac|chrp)
     platformo="$object/of.o $object/epapr.o"
     make_space=n
@@ -517,7 +512,7 @@ fi
 
 # post-processing needed for some platforms
 case "$platform" in
-pseries|chrp|maple)
+pseries|chrp)
     $objbin/addnote "$ofile"
     ;;
 coff)
diff --git a/arch/powerpc/configs/maple_defconfig b/arch/powerpc/configs/maple_defconfig
deleted file mode 100644
index c821a97f4a89..000000000000
--- a/arch/powerpc/configs/maple_defconfig
+++ /dev/null
@@ -1,111 +0,0 @@
-CONFIG_PPC64=y
-CONFIG_SMP=y
-CONFIG_NR_CPUS=4
-CONFIG_SYSVIPC=y
-CONFIG_POSIX_MQUEUE=y
-CONFIG_NO_HZ=y
-CONFIG_HIGH_RES_TIMERS=y
-CONFIG_IKCONFIG=y
-CONFIG_IKCONFIG_PROC=y
-# CONFIG_COMPAT_BRK is not set
-CONFIG_PROFILING=y
-CONFIG_KPROBES=y
-CONFIG_MODULES=y
-CONFIG_MODULE_UNLOAD=y
-CONFIG_MODVERSIONS=y
-CONFIG_MODULE_SRCVERSION_ALL=y
-# CONFIG_BLK_DEV_BSG is not set
-CONFIG_PARTITION_ADVANCED=y
-CONFIG_MAC_PARTITION=y
-# CONFIG_PPC_POWERNV is not set
-# CONFIG_PPC_PSERIES is not set
-# CONFIG_PPC_PMAC is not set
-CONFIG_PPC_MAPLE=y
-CONFIG_UDBG_RTAS_CONSOLE=y
-CONFIG_GEN_RTC=y
-CONFIG_KEXEC=y
-CONFIG_IRQ_ALL_CPUS=y
-CONFIG_PPC_4K_PAGES=y
-CONFIG_PCI_MSI=y
-CONFIG_NET=y
-CONFIG_PACKET=y
-CONFIG_UNIX=y
-CONFIG_XFRM_USER=m
-CONFIG_INET=y
-CONFIG_IP_MULTICAST=y
-CONFIG_IP_PNP=y
-CONFIG_IP_PNP_DHCP=y
-# CONFIG_IPV6 is not set
-CONFIG_BLK_DEV_RAM=y
-CONFIG_BLK_DEV_RAM_SIZE=8192
-# CONFIG_SCSI_PROC_FS is not set
-CONFIG_BLK_DEV_SD=y
-CONFIG_BLK_DEV_SR=y
-CONFIG_CHR_DEV_SG=y
-CONFIG_SCSI_IPR=y
-CONFIG_ATA=y
-CONFIG_PATA_AMD=y
-CONFIG_ATA_GENERIC=y
-CONFIG_NETDEVICES=y
-CONFIG_AMD8111_ETH=y
-CONFIG_TIGON3=y
-CONFIG_E1000=y
-CONFIG_USB_PEGASUS=y
-# CONFIG_INPUT_KEYBOARD is not set
-# CONFIG_INPUT_MOUSE is not set
-# CONFIG_SERIO is not set
-CONFIG_SERIAL_8250=y
-CONFIG_SERIAL_8250_CONSOLE=y
-CONFIG_HVC_RTAS=y
-# CONFIG_HW_RANDOM is not set
-CONFIG_I2C=y
-CONFIG_I2C_CHARDEV=y
-CONFIG_I2C_AMD8111=y
-# CONFIG_VGA_CONSOLE is not set
-CONFIG_HID_GYRATION=y
-CONFIG_HID_PANTHERLORD=y
-CONFIG_HID_PETALYNX=y
-CONFIG_HID_SAMSUNG=y
-CONFIG_HID_SUNPLUS=y
-CONFIG_USB=y
-CONFIG_USB_MON=y
-CONFIG_USB_EHCI_HCD=y
-CONFIG_USB_EHCI_ROOT_HUB_TT=y
-# CONFIG_USB_EHCI_HCD_PPC_OF is not set
-CONFIG_USB_OHCI_HCD=y
-CONFIG_USB_UHCI_HCD=y
-CONFIG_USB_SERIAL=y
-CONFIG_USB_SERIAL_GENERIC=y
-CONFIG_USB_SERIAL_CYPRESS_M8=m
-CONFIG_USB_SERIAL_GARMIN=m
-CONFIG_USB_SERIAL_IPW=m
-CONFIG_USB_SERIAL_KEYSPAN=y
-CONFIG_USB_SERIAL_TI=m
-CONFIG_EXT2_FS=y
-CONFIG_EXT4_FS=y
-CONFIG_FS_DAX=y
-CONFIG_MSDOS_FS=y
-CONFIG_VFAT_FS=y
-CONFIG_PROC_KCORE=y
-CONFIG_TMPFS=y
-CONFIG_HUGETLBFS=y
-CONFIG_CRAMFS=y
-CONFIG_NFS_FS=y
-CONFIG_NFS_V3_ACL=y
-CONFIG_NFS_V4=y
-CONFIG_ROOT_NFS=y
-CONFIG_NLS_DEFAULT="utf-8"
-CONFIG_NLS_UTF8=y
-CONFIG_CRC_CCITT=y
-CONFIG_CRC_T10DIF=y
-CONFIG_MAGIC_SYSRQ=y
-CONFIG_DEBUG_KERNEL=y
-CONFIG_DEBUG_STACK_USAGE=y
-CONFIG_DEBUG_STACKOVERFLOW=y
-CONFIG_XMON=y
-CONFIG_XMON_DEFAULT=y
-CONFIG_BOOTX_TEXT=y
-CONFIG_CRYPTO_ECB=m
-CONFIG_CRYPTO_PCBC=m
-# CONFIG_CRYPTO_HW is not set
-CONFIG_PRINTK_TIME=y
diff --git a/arch/powerpc/configs/ppc64_defconfig b/arch/powerpc/configs/ppc64_defconfig
index a5e3e7f97f4d..f39c0d000c43 100644
--- a/arch/powerpc/configs/ppc64_defconfig
+++ b/arch/powerpc/configs/ppc64_defconfig
@@ -44,7 +44,6 @@ CONFIG_PPC_SMLPAR=y
 CONFIG_IBMEBUS=y
 CONFIG_PAPR_SCM=m
 CONFIG_PPC_SVM=y
-CONFIG_PPC_MAPLE=y
 CONFIG_PPC_PASEMI=y
 CONFIG_PPC_PASEMI_IOMMU=y
 CONFIG_PPC_PS3=y
diff --git a/arch/powerpc/include/asm/udbg.h b/arch/powerpc/include/asm/udbg.h
index 289023f7a656..a8681b12864f 100644
--- a/arch/powerpc/include/asm/udbg.h
+++ b/arch/powerpc/include/asm/udbg.h
@@ -38,7 +38,6 @@ void __init udbg_early_init(void);
 void __init udbg_init_debug_lpar(void);
 void __init udbg_init_debug_lpar_hvsi(void);
 void __init udbg_init_pmac_realmode(void);
-void __init udbg_init_maple_realmode(void);
 void __init udbg_init_pas_realmode(void);
 void __init udbg_init_rtas_panel(void);
 void __init udbg_init_rtas_console(void);
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index 91123e102db4..a997c7f43dc0 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -74,7 +74,7 @@ _GLOBAL(rmci_off)
 	blr
 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
 
-#if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE)
+#ifdef CONFIG_PPC_PMAC
 
 /*
  * Do an IO access in real mode
@@ -137,7 +137,7 @@ _GLOBAL(real_writeb)
 	sync
 	isync
 	blr
-#endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE) */
+#endif // CONFIG_PPC_PMAC
 
 #ifdef CONFIG_PPC_PASEMI
 
@@ -174,7 +174,7 @@ _GLOBAL(real_205_writeb)
 #endif /* CONFIG_PPC_PASEMI */
 
 
-#if defined(CONFIG_CPU_FREQ_PMAC64) || defined(CONFIG_CPU_FREQ_MAPLE)
+#ifdef CONFIG_CPU_FREQ_PMAC64
 /*
  * SCOM access functions for 970 (FX only for now)
  *
@@ -243,7 +243,7 @@ _GLOBAL(scom970_write)
 	/* restore interrupts */
 	mtmsrd	r5,1
 	blr
-#endif /* CONFIG_CPU_FREQ_PMAC64 || CONFIG_CPU_FREQ_MAPLE */
+#endif // CONFIG_CPU_FREQ_PMAC64
 
 /* kexec_wait(phys_cpu)
  *
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index fbb68fc28ed3..73210e5bcfa7 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -2792,90 +2792,6 @@ static void __init flatten_device_tree(void)
 		    dt_struct_start, dt_struct_end);
 }
 
-#ifdef CONFIG_PPC_MAPLE
-/* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
- * The values are bad, and it doesn't even have the right number of cells. */
-static void __init fixup_device_tree_maple(void)
-{
-	phandle isa;
-	u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
-	u32 isa_ranges[6];
-	char *name;
-
-	name = "/ht@0/isa@4";
-	isa = call_prom("finddevice", 1, 1, ADDR(name));
-	if (!PHANDLE_VALID(isa)) {
-		name = "/ht@0/isa@6";
-		isa = call_prom("finddevice", 1, 1, ADDR(name));
-		rloc = 0x01003000; /* IO space; PCI device = 6 */
-	}
-	if (!PHANDLE_VALID(isa))
-		return;
-
-	if (prom_getproplen(isa, "ranges") != 12)
-		return;
-	if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
-		== PROM_ERROR)
-		return;
-
-	if (isa_ranges[0] != 0x1 ||
-		isa_ranges[1] != 0xf4000000 ||
-		isa_ranges[2] != 0x00010000)
-		return;
-
-	prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
-
-	isa_ranges[0] = 0x1;
-	isa_ranges[1] = 0x0;
-	isa_ranges[2] = rloc;
-	isa_ranges[3] = 0x0;
-	isa_ranges[4] = 0x0;
-	isa_ranges[5] = 0x00010000;
-	prom_setprop(isa, name, "ranges",
-			isa_ranges, sizeof(isa_ranges));
-}
-
-#define CPC925_MC_START		0xf8000000
-#define CPC925_MC_LENGTH	0x1000000
-/* The values for memory-controller don't have right number of cells */
-static void __init fixup_device_tree_maple_memory_controller(void)
-{
-	phandle mc;
-	u32 mc_reg[4];
-	char *name = "/hostbridge@f8000000";
-	u32 ac, sc;
-
-	mc = call_prom("finddevice", 1, 1, ADDR(name));
-	if (!PHANDLE_VALID(mc))
-		return;
-
-	if (prom_getproplen(mc, "reg") != 8)
-		return;
-
-	prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
-	prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
-	if ((ac != 2) || (sc != 2))
-		return;
-
-	if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
-		return;
-
-	if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
-		return;
-
-	prom_printf("Fixing up bogus hostbridge on Maple...\n");
-
-	mc_reg[0] = 0x0;
-	mc_reg[1] = CPC925_MC_START;
-	mc_reg[2] = 0x0;
-	mc_reg[3] = CPC925_MC_LENGTH;
-	prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
-}
-#else
-#define fixup_device_tree_maple()
-#define fixup_device_tree_maple_memory_controller()
-#endif
-
 #ifdef CONFIG_PPC_CHRP
 /*
  * Pegasos and BriQ lacks the "ranges" property in the isa node
@@ -3193,8 +3109,6 @@ static inline void fixup_device_tree_pasemi(void) { }
 
 static void __init fixup_device_tree(void)
 {
-	fixup_device_tree_maple();
-	fixup_device_tree_maple_memory_controller();
 	fixup_device_tree_chrp();
 	fixup_device_tree_pmac();
 	fixup_device_tree_efika();
diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c
index 4b99208f5adc..0a72a537f879 100644
--- a/arch/powerpc/kernel/udbg.c
+++ b/arch/powerpc/kernel/udbg.c
@@ -39,9 +39,6 @@ void __init udbg_early_init(void)
 #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE)
 	/* RTAS console debug */
 	udbg_init_rtas_console();
-#elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE)
-	/* Maple real mode debug */
-	udbg_init_maple_realmode();
 #elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE)
 	udbg_init_pas_realmode();
 #elif defined(CONFIG_PPC_EARLY_DEBUG_BOOTX)
diff --git a/arch/powerpc/kernel/udbg_16550.c b/arch/powerpc/kernel/udbg_16550.c
index 313802aff571..dfe8ed2192e8 100644
--- a/arch/powerpc/kernel/udbg_16550.c
+++ b/arch/powerpc/kernel/udbg_16550.c
@@ -205,29 +205,6 @@ void __init udbg_uart_init_mmio(void __iomem *addr, unsigned int stride)
 	udbg_use_uart();
 }
 
-#ifdef CONFIG_PPC_MAPLE
-
-#define UDBG_UART_MAPLE_ADDR	((void __iomem *)0xf40003f8)
-
-static u8 udbg_uart_in_maple(unsigned int reg)
-{
-	return real_readb(UDBG_UART_MAPLE_ADDR + reg);
-}
-
-static void udbg_uart_out_maple(unsigned int reg, u8 val)
-{
-	real_writeb(val, UDBG_UART_MAPLE_ADDR + reg);
-}
-
-void __init udbg_init_maple_realmode(void)
-{
-	udbg_uart_in = udbg_uart_in_maple;
-	udbg_uart_out = udbg_uart_out_maple;
-	udbg_use_uart();
-}
-
-#endif /* CONFIG_PPC_MAPLE */
-
 #ifdef CONFIG_PPC_PASEMI
 
 #define UDBG_UART_PAS_ADDR	((void __iomem *)0xfcff03f8UL)
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 1112a5831619..a454149ae02f 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -7,7 +7,6 @@ source "arch/powerpc/platforms/chrp/Kconfig"
 source "arch/powerpc/platforms/512x/Kconfig"
 source "arch/powerpc/platforms/52xx/Kconfig"
 source "arch/powerpc/platforms/powermac/Kconfig"
-source "arch/powerpc/platforms/maple/Kconfig"
 source "arch/powerpc/platforms/pasemi/Kconfig"
 source "arch/powerpc/platforms/ps3/Kconfig"
 source "arch/powerpc/platforms/cell/Kconfig"
diff --git a/arch/powerpc/platforms/Makefile b/arch/powerpc/platforms/Makefile
index 786d374bff31..3cee4a842736 100644
--- a/arch/powerpc/platforms/Makefile
+++ b/arch/powerpc/platforms/Makefile
@@ -14,7 +14,6 @@ obj-$(CONFIG_FSL_SOC_BOOKE)	+= 85xx/
 obj-$(CONFIG_PPC_86xx)		+= 86xx/
 obj-$(CONFIG_PPC_POWERNV)	+= powernv/
 obj-$(CONFIG_PPC_PSERIES)	+= pseries/
-obj-$(CONFIG_PPC_MAPLE)		+= maple/
 obj-$(CONFIG_PPC_PASEMI)	+= pasemi/
 obj-$(CONFIG_PPC_CELL)		+= cell/
 obj-$(CONFIG_PPC_PS3)		+= ps3/
diff --git a/arch/powerpc/platforms/maple/Kconfig b/arch/powerpc/platforms/maple/Kconfig
deleted file mode 100644
index 4c058cc57c90..000000000000
--- a/arch/powerpc/platforms/maple/Kconfig
+++ /dev/null
@@ -1,19 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-config PPC_MAPLE
-	depends on PPC64 && PPC_BOOK3S && CPU_BIG_ENDIAN
-	bool "Maple 970FX Evaluation Board"
-	select FORCE_PCI
-	select MPIC
-	select U3_DART
-	select MPIC_U3_HT_IRQS
-	select GENERIC_TBSYNC
-	select PPC_UDBG_16550
-	select PPC_970_NAP
-	select PPC_64S_HASH_MMU
-	select PPC_HASH_MMU_NATIVE
-	select PPC_RTAS
-	select MMIO_NVRAM
-	select ATA_NONSTANDARD if ATA
-	help
-	  This option enables support for the Maple 970FX Evaluation Board.
-	  For more information, refer to <http://www.970eval.com>
diff --git a/arch/powerpc/platforms/maple/Makefile b/arch/powerpc/platforms/maple/Makefile
deleted file mode 100644
index 19f35ab828a7..000000000000
--- a/arch/powerpc/platforms/maple/Makefile
+++ /dev/null
@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-obj-y	+= setup.o pci.o time.o
diff --git a/arch/powerpc/platforms/maple/maple.h b/arch/powerpc/platforms/maple/maple.h
deleted file mode 100644
index 8ddbaa4ebd0b..000000000000
--- a/arch/powerpc/platforms/maple/maple.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Declarations for maple-specific code.
- *
- * Maple is the name of a PPC970 evaluation board.
- */
-extern int maple_set_rtc_time(struct rtc_time *tm);
-extern void maple_get_rtc_time(struct rtc_time *tm);
-extern time64_t maple_get_boot_time(void);
-extern void maple_pci_init(void);
-extern void maple_pci_irq_fixup(struct pci_dev *dev);
-extern int maple_pci_get_legacy_ide_irq(struct pci_dev *dev, int channel);
-
-extern struct pci_controller_ops maple_pci_controller_ops;
diff --git a/arch/powerpc/platforms/maple/pci.c b/arch/powerpc/platforms/maple/pci.c
deleted file mode 100644
index b9ff37c7f6f0..000000000000
--- a/arch/powerpc/platforms/maple/pci.c
+++ /dev/null
@@ -1,672 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org),
- *		      IBM Corp.
- */
-
-#undef DEBUG
-
-#include <linux/kernel.h>
-#include <linux/pci.h>
-#include <linux/delay.h>
-#include <linux/string.h>
-#include <linux/init.h>
-#include <linux/irq.h>
-#include <linux/of_irq.h>
-
-#include <asm/sections.h>
-#include <asm/io.h>
-#include <asm/pci-bridge.h>
-#include <asm/machdep.h>
-#include <asm/iommu.h>
-#include <asm/ppc-pci.h>
-#include <asm/isa-bridge.h>
-
-#include "maple.h"
-
-#ifdef DEBUG
-#define DBG(x...) printk(x)
-#else
-#define DBG(x...)
-#endif
-
-static struct pci_controller *u3_agp, *u3_ht, *u4_pcie;
-
-static int __init fixup_one_level_bus_range(struct device_node *node, int higher)
-{
-	for (; node; node = node->sibling) {
-		const int *bus_range;
-		const unsigned int *class_code;
-		int len;
-
-		/* For PCI<->PCI bridges or CardBus bridges, we go down */
-		class_code = of_get_property(node, "class-code", NULL);
-		if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
-			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
-			continue;
-		bus_range = of_get_property(node, "bus-range", &len);
-		if (bus_range != NULL && len > 2 * sizeof(int)) {
-			if (bus_range[1] > higher)
-				higher = bus_range[1];
-		}
-		higher = fixup_one_level_bus_range(node->child, higher);
-	}
-	return higher;
-}
-
-/* This routine fixes the "bus-range" property of all bridges in the
- * system since they tend to have their "last" member wrong on macs
- *
- * Note that the bus numbers manipulated here are OF bus numbers, they
- * are not Linux bus numbers.
- */
-static void __init fixup_bus_range(struct device_node *bridge)
-{
-	int *bus_range;
-	struct property *prop;
-	int len;
-
-	/* Lookup the "bus-range" property for the hose */
-	prop = of_find_property(bridge, "bus-range", &len);
-	if (prop == NULL  || prop->value == NULL || len < 2 * sizeof(int)) {
-		printk(KERN_WARNING "Can't get bus-range for %pOF\n",
-			       bridge);
-		return;
-	}
-	bus_range = prop->value;
-	bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]);
-}
-
-
-static unsigned long u3_agp_cfa0(u8 devfn, u8 off)
-{
-	return (1 << (unsigned long)PCI_SLOT(devfn)) |
-		((unsigned long)PCI_FUNC(devfn) << 8) |
-		((unsigned long)off & 0xFCUL);
-}
-
-static unsigned long u3_agp_cfa1(u8 bus, u8 devfn, u8 off)
-{
-	return ((unsigned long)bus << 16) |
-		((unsigned long)devfn << 8) |
-		((unsigned long)off & 0xFCUL) |
-		1UL;
-}
-
-static volatile void __iomem *u3_agp_cfg_access(struct pci_controller* hose,
-				       u8 bus, u8 dev_fn, u8 offset)
-{
-	unsigned int caddr;
-
-	if (bus == hose->first_busno) {
-		if (dev_fn < (11 << 3))
-			return NULL;
-		caddr = u3_agp_cfa0(dev_fn, offset);
-	} else
-		caddr = u3_agp_cfa1(bus, dev_fn, offset);
-
-	/* Uninorth will return garbage if we don't read back the value ! */
-	do {
-		out_le32(hose->cfg_addr, caddr);
-	} while (in_le32(hose->cfg_addr) != caddr);
-
-	offset &= 0x07;
-	return hose->cfg_data + offset;
-}
-
-static int u3_agp_read_config(struct pci_bus *bus, unsigned int devfn,
-			      int offset, int len, u32 *val)
-{
-	struct pci_controller *hose;
-	volatile void __iomem *addr;
-
-	hose = pci_bus_to_host(bus);
-	if (hose == NULL)
-		return PCIBIOS_DEVICE_NOT_FOUND;
-
-	addr = u3_agp_cfg_access(hose, bus->number, devfn, offset);
-	if (!addr)
-		return PCIBIOS_DEVICE_NOT_FOUND;
-	/*
-	 * Note: the caller has already checked that offset is
-	 * suitably aligned and that len is 1, 2 or 4.
-	 */
-	switch (len) {
-	case 1:
-		*val = in_8(addr);
-		break;
-	case 2:
-		*val = in_le16(addr);
-		break;
-	default:
-		*val = in_le32(addr);
-		break;
-	}
-	return PCIBIOS_SUCCESSFUL;
-}
-
-static int u3_agp_write_config(struct pci_bus *bus, unsigned int devfn,
-			       int offset, int len, u32 val)
-{
-	struct pci_controller *hose;
-	volatile void __iomem *addr;
-
-	hose = pci_bus_to_host(bus);
-	if (hose == NULL)
-		return PCIBIOS_DEVICE_NOT_FOUND;
-
-	addr = u3_agp_cfg_access(hose, bus->number, devfn, offset);
-	if (!addr)
-		return PCIBIOS_DEVICE_NOT_FOUND;
-	/*
-	 * Note: the caller has already checked that offset is
-	 * suitably aligned and that len is 1, 2 or 4.
-	 */
-	switch (len) {
-	case 1:
-		out_8(addr, val);
-		break;
-	case 2:
-		out_le16(addr, val);
-		break;
-	default:
-		out_le32(addr, val);
-		break;
-	}
-	return PCIBIOS_SUCCESSFUL;
-}
-
-static struct pci_ops u3_agp_pci_ops =
-{
-	.read = u3_agp_read_config,
-	.write = u3_agp_write_config,
-};
-
-static unsigned long u3_ht_cfa0(u8 devfn, u8 off)
-{
-	return (devfn << 8) | off;
-}
-
-static unsigned long u3_ht_cfa1(u8 bus, u8 devfn, u8 off)
-{
-	return u3_ht_cfa0(devfn, off) + (bus << 16) + 0x01000000UL;
-}
-
-static volatile void __iomem *u3_ht_cfg_access(struct pci_controller* hose,
-				      u8 bus, u8 devfn, u8 offset)
-{
-	if (bus == hose->first_busno) {
-		if (PCI_SLOT(devfn) == 0)
-			return NULL;
-		return hose->cfg_data + u3_ht_cfa0(devfn, offset);
-	} else
-		return hose->cfg_data + u3_ht_cfa1(bus, devfn, offset);
-}
-
-static int u3_ht_root_read_config(struct pci_controller *hose, u8 offset,
-				  int len, u32 *val)
-{
-	volatile void __iomem *addr;
-
-	addr = hose->cfg_addr;
-	addr += ((offset & ~3) << 2) + (4 - len - (offset & 3));
-
-	switch (len) {
-	case 1:
-		*val = in_8(addr);
-		break;
-	case 2:
-		*val = in_be16(addr);
-		break;
-	default:
-		*val = in_be32(addr);
-		break;
-	}
-
-	return PCIBIOS_SUCCESSFUL;
-}
-
-static int u3_ht_root_write_config(struct pci_controller *hose, u8 offset,
-				  int len, u32 val)
-{
-	volatile void __iomem *addr;
-
-	addr = hose->cfg_addr + ((offset & ~3) << 2) + (4 - len - (offset & 3));
-
-	if (offset >= PCI_BASE_ADDRESS_0 && offset < PCI_CAPABILITY_LIST)
-		return PCIBIOS_SUCCESSFUL;
-
-	switch (len) {
-	case 1:
-		out_8(addr, val);
-		break;
-	case 2:
-		out_be16(addr, val);
-		break;
-	default:
-		out_be32(addr, val);
-		break;
-	}
-
-	return PCIBIOS_SUCCESSFUL;
-}
-
-static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
-			     int offset, int len, u32 *val)
-{
-	struct pci_controller *hose;
-	volatile void __iomem *addr;
-
-	hose = pci_bus_to_host(bus);
-	if (hose == NULL)
-		return PCIBIOS_DEVICE_NOT_FOUND;
-
-	if (bus->number == hose->first_busno && devfn == PCI_DEVFN(0, 0))
-		return u3_ht_root_read_config(hose, offset, len, val);
-
-	if (offset > 0xff)
-		return PCIBIOS_BAD_REGISTER_NUMBER;
-
-	addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
-	if (!addr)
-		return PCIBIOS_DEVICE_NOT_FOUND;
-
-	/*
-	 * Note: the caller has already checked that offset is
-	 * suitably aligned and that len is 1, 2 or 4.
-	 */
-	switch (len) {
-	case 1:
-		*val = in_8(addr);
-		break;
-	case 2:
-		*val = in_le16(addr);
-		break;
-	default:
-		*val = in_le32(addr);
-		break;
-	}
-	return PCIBIOS_SUCCESSFUL;
-}
-
-static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
-			      int offset, int len, u32 val)
-{
-	struct pci_controller *hose;
-	volatile void __iomem *addr;
-
-	hose = pci_bus_to_host(bus);
-	if (hose == NULL)
-		return PCIBIOS_DEVICE_NOT_FOUND;
-
-	if (bus->number == hose->first_busno && devfn == PCI_DEVFN(0, 0))
-		return u3_ht_root_write_config(hose, offset, len, val);
-
-	if (offset > 0xff)
-		return PCIBIOS_BAD_REGISTER_NUMBER;
-
-	addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
-	if (!addr)
-		return PCIBIOS_DEVICE_NOT_FOUND;
-	/*
-	 * Note: the caller has already checked that offset is
-	 * suitably aligned and that len is 1, 2 or 4.
-	 */
-	switch (len) {
-	case 1:
-		out_8(addr, val);
-		break;
-	case 2:
-		out_le16(addr, val);
-		break;
-	default:
-		out_le32(addr, val);
-		break;
-	}
-	return PCIBIOS_SUCCESSFUL;
-}
-
-static struct pci_ops u3_ht_pci_ops =
-{
-	.read = u3_ht_read_config,
-	.write = u3_ht_write_config,
-};
-
-static unsigned int u4_pcie_cfa0(unsigned int devfn, unsigned int off)
-{
-	return (1 << PCI_SLOT(devfn))	|
-	       (PCI_FUNC(devfn) << 8)	|
-	       ((off >> 8) << 28) 	|
-	       (off & 0xfcu);
-}
-
-static unsigned int u4_pcie_cfa1(unsigned int bus, unsigned int devfn,
-				 unsigned int off)
-{
-        return (bus << 16)		|
-	       (devfn << 8)		|
-	       ((off >> 8) << 28)	|
-	       (off & 0xfcu)		| 1u;
-}
-
-static volatile void __iomem *u4_pcie_cfg_access(struct pci_controller* hose,
-                                        u8 bus, u8 dev_fn, int offset)
-{
-        unsigned int caddr;
-
-        if (bus == hose->first_busno)
-                caddr = u4_pcie_cfa0(dev_fn, offset);
-        else
-                caddr = u4_pcie_cfa1(bus, dev_fn, offset);
-
-        /* Uninorth will return garbage if we don't read back the value ! */
-        do {
-                out_le32(hose->cfg_addr, caddr);
-        } while (in_le32(hose->cfg_addr) != caddr);
-
-        offset &= 0x03;
-        return hose->cfg_data + offset;
-}
-
-static int u4_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
-                               int offset, int len, u32 *val)
-{
-        struct pci_controller *hose;
-        volatile void __iomem *addr;
-
-        hose = pci_bus_to_host(bus);
-        if (hose == NULL)
-                return PCIBIOS_DEVICE_NOT_FOUND;
-        if (offset >= 0x1000)
-                return  PCIBIOS_BAD_REGISTER_NUMBER;
-        addr = u4_pcie_cfg_access(hose, bus->number, devfn, offset);
-        if (!addr)
-                return PCIBIOS_DEVICE_NOT_FOUND;
-        /*
-         * Note: the caller has already checked that offset is
-         * suitably aligned and that len is 1, 2 or 4.
-         */
-        switch (len) {
-        case 1:
-                *val = in_8(addr);
-                break;
-        case 2:
-                *val = in_le16(addr);
-                break;
-        default:
-                *val = in_le32(addr);
-                break;
-        }
-        return PCIBIOS_SUCCESSFUL;
-}
-static int u4_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
-                                int offset, int len, u32 val)
-{
-        struct pci_controller *hose;
-        volatile void __iomem *addr;
-
-        hose = pci_bus_to_host(bus);
-        if (hose == NULL)
-                return PCIBIOS_DEVICE_NOT_FOUND;
-        if (offset >= 0x1000)
-                return  PCIBIOS_BAD_REGISTER_NUMBER;
-        addr = u4_pcie_cfg_access(hose, bus->number, devfn, offset);
-        if (!addr)
-                return PCIBIOS_DEVICE_NOT_FOUND;
-        /*
-         * Note: the caller has already checked that offset is
-         * suitably aligned and that len is 1, 2 or 4.
-         */
-        switch (len) {
-        case 1:
-                out_8(addr, val);
-                break;
-        case 2:
-                out_le16(addr, val);
-                break;
-        default:
-                out_le32(addr, val);
-                break;
-        }
-        return PCIBIOS_SUCCESSFUL;
-}
-
-static struct pci_ops u4_pcie_pci_ops =
-{
-	.read = u4_pcie_read_config,
-	.write = u4_pcie_write_config,
-};
-
-static void __init setup_u3_agp(struct pci_controller* hose)
-{
-	/* On G5, we move AGP up to high bus number so we don't need
-	 * to reassign bus numbers for HT. If we ever have P2P bridges
-	 * on AGP, we'll have to move pci_assign_all_buses to the
-	 * pci_controller structure so we enable it for AGP and not for
-	 * HT childs.
-	 * We hard code the address because of the different size of
-	 * the reg address cell, we shall fix that by killing struct
-	 * reg_property and using some accessor functions instead
-	 */
-	hose->first_busno = 0xf0;
-	hose->last_busno = 0xff;
-	hose->ops = &u3_agp_pci_ops;
-	hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
-	hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);
-
-	u3_agp = hose;
-}
-
-static void __init setup_u4_pcie(struct pci_controller* hose)
-{
-        /* We currently only implement the "non-atomic" config space, to
-         * be optimised later.
-         */
-        hose->ops = &u4_pcie_pci_ops;
-        hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
-        hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);
-
-        u4_pcie = hose;
-}
-
-static void __init setup_u3_ht(struct pci_controller* hose)
-{
-	hose->ops = &u3_ht_pci_ops;
-
-	/* We hard code the address because of the different size of
-	 * the reg address cell, we shall fix that by killing struct
-	 * reg_property and using some accessor functions instead
-	 */
-	hose->cfg_data = ioremap(0xf2000000, 0x02000000);
-	hose->cfg_addr = ioremap(0xf8070000, 0x1000);
-
-	hose->first_busno = 0;
-	hose->last_busno = 0xef;
-
-	u3_ht = hose;
-}
-
-static int __init maple_add_bridge(struct device_node *dev)
-{
-	int len;
-	struct pci_controller *hose;
-	char* disp_name;
-	const int *bus_range;
-	int primary = 1;
-
-	DBG("Adding PCI host bridge %pOF\n", dev);
-
-	bus_range = of_get_property(dev, "bus-range", &len);
-	if (bus_range == NULL || len < 2 * sizeof(int)) {
-		printk(KERN_WARNING "Can't get bus-range for %pOF, assume bus 0\n",
-		dev);
-	}
-
-	hose = pcibios_alloc_controller(dev);
-	if (hose == NULL)
-		return -ENOMEM;
-	hose->first_busno = bus_range ? bus_range[0] : 0;
-	hose->last_busno = bus_range ? bus_range[1] : 0xff;
-	hose->controller_ops = maple_pci_controller_ops;
-
-	disp_name = NULL;
-	if (of_device_is_compatible(dev, "u3-agp")) {
-		setup_u3_agp(hose);
-		disp_name = "U3-AGP";
-		primary = 0;
-	} else if (of_device_is_compatible(dev, "u3-ht")) {
-		setup_u3_ht(hose);
-		disp_name = "U3-HT";
-		primary = 1;
-        } else if (of_device_is_compatible(dev, "u4-pcie")) {
-                setup_u4_pcie(hose);
-                disp_name = "U4-PCIE";
-                primary = 0;
-	}
-	printk(KERN_INFO "Found %s PCI host bridge. Firmware bus number: %d->%d\n",
-		disp_name, hose->first_busno, hose->last_busno);
-
-	/* Interpret the "ranges" property */
-	/* This also maps the I/O region and sets isa_io/mem_base */
-	pci_process_bridge_OF_ranges(hose, dev, primary);
-
-	/* Fixup "bus-range" OF property */
-	fixup_bus_range(dev);
-
-	/* Check for legacy IOs */
-	isa_bridge_find_early(hose);
-
-	/* create pci_dn's for DT nodes under this PHB */
-	pci_devs_phb_init_dynamic(hose);
-
-	return 0;
-}
-
-
-void maple_pci_irq_fixup(struct pci_dev *dev)
-{
-	DBG(" -> maple_pci_irq_fixup\n");
-
-	/* Fixup IRQ for PCIe host */
-	if (u4_pcie != NULL && dev->bus->number == 0 &&
-	    pci_bus_to_host(dev->bus) == u4_pcie) {
-		printk(KERN_DEBUG "Fixup U4 PCIe IRQ\n");
-		dev->irq = irq_create_mapping(NULL, 1);
-		if (dev->irq)
-			irq_set_irq_type(dev->irq, IRQ_TYPE_LEVEL_LOW);
-	}
-
-	/* Hide AMD8111 IDE interrupt when in legacy mode so
-	 * the driver calls pci_get_legacy_ide_irq()
-	 */
-	if (dev->vendor == PCI_VENDOR_ID_AMD &&
-	    dev->device == PCI_DEVICE_ID_AMD_8111_IDE &&
-	    (dev->class & 5) != 5) {
-		dev->irq = 0;
-	}
-
-	DBG(" <- maple_pci_irq_fixup\n");
-}
-
-static int maple_pci_root_bridge_prepare(struct pci_host_bridge *bridge)
-{
-	struct pci_controller *hose = pci_bus_to_host(bridge->bus);
-	struct device_node *np, *child;
-
-	if (hose != u3_agp)
-		return 0;
-
-	/* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
-	 * assume there is no P2P bridge on the AGP bus, which should be a
-	 * safe assumptions hopefully.
-	 */
-	np = hose->dn;
-	PCI_DN(np)->busno = 0xf0;
-	for_each_child_of_node(np, child)
-		PCI_DN(child)->busno = 0xf0;
-
-	return 0;
-}
-
-void __init maple_pci_init(void)
-{
-	struct device_node *np, *root;
-	struct device_node *ht = NULL;
-
-	/* Probe root PCI hosts, that is on U3 the AGP host and the
-	 * HyperTransport host. That one is actually "kept" around
-	 * and actually added last as its resource management relies
-	 * on the AGP resources to have been setup first
-	 */
-	root = of_find_node_by_path("/");
-	if (root == NULL) {
-		printk(KERN_CRIT "maple_find_bridges: can't find root of device tree\n");
-		return;
-	}
-	for_each_child_of_node(root, np) {
-		if (!of_node_is_type(np, "pci") && !of_node_is_type(np, "ht"))
-			continue;
-		if ((of_device_is_compatible(np, "u4-pcie") ||
-		     of_device_is_compatible(np, "u3-agp")) &&
-		    maple_add_bridge(np) == 0)
-			of_node_get(np);
-
-		if (of_device_is_compatible(np, "u3-ht")) {
-			of_node_get(np);
-			ht = np;
-		}
-	}
-	of_node_put(root);
-
-	/* Now setup the HyperTransport host if we found any
-	 */
-	if (ht && maple_add_bridge(ht) != 0)
-		of_node_put(ht);
-
-	ppc_md.pcibios_root_bridge_prepare = maple_pci_root_bridge_prepare;
-
-	/* Tell pci.c to not change any resource allocations.  */
-	pci_add_flags(PCI_PROBE_ONLY);
-}
-
-int maple_pci_get_legacy_ide_irq(struct pci_dev *pdev, int channel)
-{
-	struct device_node *np;
-	unsigned int defirq = channel ? 15 : 14;
-	unsigned int irq;
-
-	if (pdev->vendor != PCI_VENDOR_ID_AMD ||
-	    pdev->device != PCI_DEVICE_ID_AMD_8111_IDE)
-		return defirq;
-
-	np = pci_device_to_OF_node(pdev);
-	if (np == NULL) {
-		printk("Failed to locate OF node for IDE %s\n",
-		       pci_name(pdev));
-		return defirq;
-	}
-	irq = irq_of_parse_and_map(np, channel & 0x1);
-	if (!irq) {
-		printk("Failed to map onboard IDE interrupt for channel %d\n",
-		       channel);
-		return defirq;
-	}
-	return irq;
-}
-
-static void quirk_ipr_msi(struct pci_dev *dev)
-{
-	/* Something prevents MSIs from the IPR from working on Bimini,
-	 * and the driver has no smarts to recover. So disable MSI
-	 * on it for now. */
-
-	if (machine_is(maple)) {
-		dev->no_msi = 1;
-		dev_info(&dev->dev, "Quirk disabled MSI\n");
-	}
-}
-DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_OBSIDIAN,
-			quirk_ipr_msi);
-
-struct pci_controller_ops maple_pci_controller_ops = {
-};
diff --git a/arch/powerpc/platforms/maple/setup.c b/arch/powerpc/platforms/maple/setup.c
deleted file mode 100644
index f329a03edf4a..000000000000
--- a/arch/powerpc/platforms/maple/setup.c
+++ /dev/null
@@ -1,363 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- *  Maple (970 eval board) setup code
- *
- *  (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
- *                     IBM Corp. 
- */
-
-#undef DEBUG
-
-#include <linux/init.h>
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/export.h>
-#include <linux/mm.h>
-#include <linux/stddef.h>
-#include <linux/unistd.h>
-#include <linux/ptrace.h>
-#include <linux/user.h>
-#include <linux/tty.h>
-#include <linux/string.h>
-#include <linux/delay.h>
-#include <linux/ioport.h>
-#include <linux/major.h>
-#include <linux/initrd.h>
-#include <linux/vt_kern.h>
-#include <linux/console.h>
-#include <linux/pci.h>
-#include <linux/adb.h>
-#include <linux/cuda.h>
-#include <linux/pmu.h>
-#include <linux/irq.h>
-#include <linux/seq_file.h>
-#include <linux/root_dev.h>
-#include <linux/serial.h>
-#include <linux/smp.h>
-#include <linux/bitops.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/platform_device.h>
-#include <linux/memblock.h>
-
-#include <asm/processor.h>
-#include <asm/sections.h>
-#include <asm/io.h>
-#include <asm/pci-bridge.h>
-#include <asm/iommu.h>
-#include <asm/machdep.h>
-#include <asm/dma.h>
-#include <asm/cputable.h>
-#include <asm/time.h>
-#include <asm/mpic.h>
-#include <asm/rtas.h>
-#include <asm/udbg.h>
-#include <asm/nvram.h>
-
-#include "maple.h"
-
-#ifdef DEBUG
-#define DBG(fmt...) udbg_printf(fmt)
-#else
-#define DBG(fmt...)
-#endif
-
-static unsigned long maple_find_nvram_base(void)
-{
-	struct device_node *rtcs;
-	unsigned long result = 0;
-
-	/* find NVRAM device */
-	rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
-	if (rtcs) {
-		struct resource r;
-		if (of_address_to_resource(rtcs, 0, &r)) {
-			printk(KERN_EMERG "Maple: Unable to translate NVRAM"
-			       " address\n");
-			goto bail;
-		}
-		if (!(r.flags & IORESOURCE_IO)) {
-			printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
-			goto bail;
-		}
-		result = r.start;
-	} else
-		printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
- bail:
-	of_node_put(rtcs);
-	return result;
-}
-
-static void __noreturn maple_restart(char *cmd)
-{
-	unsigned int maple_nvram_base;
-	const unsigned int *maple_nvram_offset, *maple_nvram_command;
-	struct device_node *sp;
-
-	maple_nvram_base = maple_find_nvram_base();
-	if (maple_nvram_base == 0)
-		goto fail;
-
-	/* find service processor device */
-	sp = of_find_node_by_name(NULL, "service-processor");
-	if (!sp) {
-		printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
-		goto fail;
-	}
-	maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
-	maple_nvram_command = of_get_property(sp, "restart-value", NULL);
-	of_node_put(sp);
-
-	/* send command */
-	outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
-	for (;;) ;
- fail:
-	printk(KERN_EMERG "Maple: Manual Restart Required\n");
-	for (;;) ;
-}
-
-static void __noreturn maple_power_off(void)
-{
-	unsigned int maple_nvram_base;
-	const unsigned int *maple_nvram_offset, *maple_nvram_command;
-	struct device_node *sp;
-
-	maple_nvram_base = maple_find_nvram_base();
-	if (maple_nvram_base == 0)
-		goto fail;
-
-	/* find service processor device */
-	sp = of_find_node_by_name(NULL, "service-processor");
-	if (!sp) {
-		printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
-		goto fail;
-	}
-	maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
-	maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
-	of_node_put(sp);
-
-	/* send command */
-	outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
-	for (;;) ;
- fail:
-	printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
-	for (;;) ;
-}
-
-static void __noreturn maple_halt(void)
-{
-	maple_power_off();
-}
-
-#ifdef CONFIG_SMP
-static struct smp_ops_t maple_smp_ops = {
-	.probe		= smp_mpic_probe,
-	.message_pass	= smp_mpic_message_pass,
-	.kick_cpu	= smp_generic_kick_cpu,
-	.setup_cpu	= smp_mpic_setup_cpu,
-	.give_timebase	= smp_generic_give_timebase,
-	.take_timebase	= smp_generic_take_timebase,
-};
-#endif /* CONFIG_SMP */
-
-static void __init maple_use_rtas_reboot_and_halt_if_present(void)
-{
-	if (rtas_function_implemented(RTAS_FN_SYSTEM_REBOOT) &&
-	    rtas_function_implemented(RTAS_FN_POWER_OFF)) {
-		ppc_md.restart = rtas_restart;
-		pm_power_off = rtas_power_off;
-		ppc_md.halt = rtas_halt;
-	}
-}
-
-static void __init maple_setup_arch(void)
-{
-	/* init to some ~sane value until calibrate_delay() runs */
-	loops_per_jiffy = 50000000;
-
-	/* Setup SMP callback */
-#ifdef CONFIG_SMP
-	smp_ops = &maple_smp_ops;
-#endif
-	maple_use_rtas_reboot_and_halt_if_present();
-
-	printk(KERN_DEBUG "Using native/NAP idle loop\n");
-
-	mmio_nvram_init();
-}
-
-/*
- * This is almost identical to pSeries and CHRP. We need to make that
- * code generic at one point, with appropriate bits in the device-tree to
- * identify the presence of an HT APIC
- */
-static void __init maple_init_IRQ(void)
-{
-	struct device_node *root, *np, *mpic_node = NULL;
-	const unsigned int *opprop;
-	unsigned long openpic_addr = 0;
-	int naddr, n, i, opplen, has_isus = 0;
-	struct mpic *mpic;
-	unsigned int flags = 0;
-
-	/* Locate MPIC in the device-tree. Note that there is a bug
-	 * in Maple device-tree where the type of the controller is
-	 * open-pic and not interrupt-controller
-	 */
-
-	for_each_node_by_type(np, "interrupt-controller")
-		if (of_device_is_compatible(np, "open-pic")) {
-			mpic_node = np;
-			break;
-		}
-	if (mpic_node == NULL)
-		for_each_node_by_type(np, "open-pic") {
-			mpic_node = np;
-			break;
-		}
-	if (mpic_node == NULL) {
-		printk(KERN_ERR
-		       "Failed to locate the MPIC interrupt controller\n");
-		return;
-	}
-
-	/* Find address list in /platform-open-pic */
-	root = of_find_node_by_path("/");
-	naddr = of_n_addr_cells(root);
-	opprop = of_get_property(root, "platform-open-pic", &opplen);
-	if (opprop) {
-		openpic_addr = of_read_number(opprop, naddr);
-		has_isus = (opplen > naddr);
-		printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
-		       openpic_addr, has_isus);
-	}
-
-	BUG_ON(openpic_addr == 0);
-
-	/* Check for a big endian MPIC */
-	if (of_property_read_bool(np, "big-endian"))
-		flags |= MPIC_BIG_ENDIAN;
-
-	/* XXX Maple specific bits */
-	flags |= MPIC_U3_HT_IRQS;
-	/* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
-	flags |= MPIC_BIG_ENDIAN;
-
-	/* Setup the openpic driver. More device-tree junks, we hard code no
-	 * ISUs for now. I'll have to revisit some stuffs with the folks doing
-	 * the firmware for those
-	 */
-	mpic = mpic_alloc(mpic_node, openpic_addr, flags,
-			  /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
-	BUG_ON(mpic == NULL);
-
-	/* Add ISUs */
-	opplen /= sizeof(u32);
-	for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
-		unsigned long isuaddr = of_read_number(opprop + i, naddr);
-		mpic_assign_isu(mpic, n, isuaddr);
-	}
-
-	/* All ISUs are setup, complete initialization */
-	mpic_init(mpic);
-	ppc_md.get_irq = mpic_get_irq;
-	of_node_put(mpic_node);
-	of_node_put(root);
-}
-
-static void __init maple_progress(char *s, unsigned short hex)
-{
-	printk("*** %04x : %s\n", hex, s ? s : "");
-}
-
-
-/*
- * Called very early, MMU is off, device-tree isn't unflattened
- */
-static int __init maple_probe(void)
-{
-	if (!of_machine_is_compatible("Momentum,Maple") &&
-	    !of_machine_is_compatible("Momentum,Apache"))
-		return 0;
-
-	pm_power_off = maple_power_off;
-
-	iommu_init_early_dart(&maple_pci_controller_ops);
-
-	return 1;
-}
-
-#ifdef CONFIG_EDAC
-/*
- * Register a platform device for CPC925 memory controller on
- * all boards with U3H (CPC925) bridge.
- */
-static int __init maple_cpc925_edac_setup(void)
-{
-	struct platform_device *pdev;
-	struct device_node *np = NULL;
-	struct resource r;
-	int ret;
-	volatile void __iomem *mem;
-	u32 rev;
-
-	np = of_find_node_by_type(NULL, "memory-controller");
-	if (!np) {
-		printk(KERN_ERR "%s: Unable to find memory-controller node\n",
-			__func__);
-		return -ENODEV;
-	}
-
-	ret = of_address_to_resource(np, 0, &r);
-	of_node_put(np);
-
-	if (ret < 0) {
-		printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
-			__func__);
-		return -ENODEV;
-	}
-
-	mem = ioremap(r.start, resource_size(&r));
-	if (!mem) {
-		printk(KERN_ERR "%s: Unable to map memory-controller memory\n",
-				__func__);
-		return -ENOMEM;
-	}
-
-	rev = __raw_readl(mem);
-	iounmap(mem);
-
-	if (rev < 0x34 || rev > 0x3f) { /* U3H */
-		printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n",
-			__func__, rev);
-		return 0;
-	}
-
-	pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
-	if (IS_ERR(pdev))
-		return PTR_ERR(pdev);
-
-	printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);
-
-	return 0;
-}
-machine_device_initcall(maple, maple_cpc925_edac_setup);
-#endif
-
-define_machine(maple) {
-	.name			= "Maple",
-	.probe			= maple_probe,
-	.setup_arch		= maple_setup_arch,
-	.discover_phbs		= maple_pci_init,
-	.init_IRQ		= maple_init_IRQ,
-	.pci_irq_fixup		= maple_pci_irq_fixup,
-	.pci_get_legacy_ide_irq	= maple_pci_get_legacy_ide_irq,
-	.restart		= maple_restart,
-	.halt			= maple_halt,
-	.get_boot_time		= maple_get_boot_time,
-	.set_rtc_time		= maple_set_rtc_time,
-	.get_rtc_time		= maple_get_rtc_time,
-	.progress		= maple_progress,
-	.power_save		= power4_idle,
-};
diff --git a/arch/powerpc/platforms/maple/time.c b/arch/powerpc/platforms/maple/time.c
deleted file mode 100644
index 91606411d2e0..000000000000
--- a/arch/powerpc/platforms/maple/time.c
+++ /dev/null
@@ -1,170 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- *  (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
- *                     IBM Corp. 
- */
-
-#undef DEBUG
-
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/param.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/init.h>
-#include <linux/time.h>
-#include <linux/adb.h>
-#include <linux/pmu.h>
-#include <linux/interrupt.h>
-#include <linux/mc146818rtc.h>
-#include <linux/bcd.h>
-#include <linux/of_address.h>
-
-#include <asm/sections.h>
-#include <asm/io.h>
-#include <asm/machdep.h>
-#include <asm/time.h>
-
-#include "maple.h"
-
-#ifdef DEBUG
-#define DBG(x...) printk(x)
-#else
-#define DBG(x...)
-#endif
-
-static int maple_rtc_addr;
-
-static int maple_clock_read(int addr)
-{
-	outb_p(addr, maple_rtc_addr);
-	return inb_p(maple_rtc_addr+1);
-}
-
-static void maple_clock_write(unsigned long val, int addr)
-{
-	outb_p(addr, maple_rtc_addr);
-	outb_p(val, maple_rtc_addr+1);
-}
-
-void maple_get_rtc_time(struct rtc_time *tm)
-{
-	do {
-		tm->tm_sec = maple_clock_read(RTC_SECONDS);
-		tm->tm_min = maple_clock_read(RTC_MINUTES);
-		tm->tm_hour = maple_clock_read(RTC_HOURS);
-		tm->tm_mday = maple_clock_read(RTC_DAY_OF_MONTH);
-		tm->tm_mon = maple_clock_read(RTC_MONTH);
-		tm->tm_year = maple_clock_read(RTC_YEAR);
-	} while (tm->tm_sec != maple_clock_read(RTC_SECONDS));
-
-	if (!(maple_clock_read(RTC_CONTROL) & RTC_DM_BINARY)
-	    || RTC_ALWAYS_BCD) {
-		tm->tm_sec = bcd2bin(tm->tm_sec);
-		tm->tm_min = bcd2bin(tm->tm_min);
-		tm->tm_hour = bcd2bin(tm->tm_hour);
-		tm->tm_mday = bcd2bin(tm->tm_mday);
-		tm->tm_mon = bcd2bin(tm->tm_mon);
-		tm->tm_year = bcd2bin(tm->tm_year);
-	  }
-	if ((tm->tm_year + 1900) < 1970)
-		tm->tm_year += 100;
-
-	tm->tm_wday = -1;
-}
-
-int maple_set_rtc_time(struct rtc_time *tm)
-{
-	unsigned char save_control, save_freq_select;
-	int sec, min, hour, mon, mday, year;
-
-	spin_lock(&rtc_lock);
-
-	save_control = maple_clock_read(RTC_CONTROL); /* tell the clock it's being set */
-
-	maple_clock_write((save_control|RTC_SET), RTC_CONTROL);
-
-	save_freq_select = maple_clock_read(RTC_FREQ_SELECT); /* stop and reset prescaler */
-
-	maple_clock_write((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
-
-	sec = tm->tm_sec;
-	min = tm->tm_min;
-	hour = tm->tm_hour;
-	mon = tm->tm_mon;
-	mday = tm->tm_mday;
-	year = tm->tm_year;
-
-	if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
-		sec = bin2bcd(sec);
-		min = bin2bcd(min);
-		hour = bin2bcd(hour);
-		mon = bin2bcd(mon);
-		mday = bin2bcd(mday);
-		year = bin2bcd(year);
-	}
-	maple_clock_write(sec, RTC_SECONDS);
-	maple_clock_write(min, RTC_MINUTES);
-	maple_clock_write(hour, RTC_HOURS);
-	maple_clock_write(mon, RTC_MONTH);
-	maple_clock_write(mday, RTC_DAY_OF_MONTH);
-	maple_clock_write(year, RTC_YEAR);
-
-	/* The following flags have to be released exactly in this order,
-	 * otherwise the DS12887 (popular MC146818A clone with integrated
-	 * battery and quartz) will not reset the oscillator and will not
-	 * update precisely 500 ms later. You won't find this mentioned in
-	 * the Dallas Semiconductor data sheets, but who believes data
-	 * sheets anyway ...                           -- Markus Kuhn
-	 */
-	maple_clock_write(save_control, RTC_CONTROL);
-	maple_clock_write(save_freq_select, RTC_FREQ_SELECT);
-
-	spin_unlock(&rtc_lock);
-
-	return 0;
-}
-
-static struct resource rtc_iores = {
-	.name = "rtc",
-	.flags = IORESOURCE_IO | IORESOURCE_BUSY,
-};
-
-time64_t __init maple_get_boot_time(void)
-{
-	struct rtc_time tm;
-	struct device_node *rtcs;
-
-	rtcs = of_find_compatible_node(NULL, "rtc", "pnpPNP,b00");
-	if (rtcs) {
-		struct resource r;
-		if (of_address_to_resource(rtcs, 0, &r)) {
-			printk(KERN_EMERG "Maple: Unable to translate RTC"
-			       " address\n");
-			goto bail;
-		}
-		if (!(r.flags & IORESOURCE_IO)) {
-			printk(KERN_EMERG "Maple: RTC address isn't PIO!\n");
-			goto bail;
-		}
-		maple_rtc_addr = r.start;
-		printk(KERN_INFO "Maple: Found RTC at IO 0x%x\n",
-		       maple_rtc_addr);
-	}
- bail:
-	of_node_put(rtcs);
-	if (maple_rtc_addr == 0) {
-		maple_rtc_addr = RTC_PORT(0); /* legacy address */
-		printk(KERN_INFO "Maple: No device node for RTC, assuming "
-		       "legacy address (0x%x)\n", maple_rtc_addr);
-	}
-
-	rtc_iores.start = maple_rtc_addr;
-	rtc_iores.end = maple_rtc_addr + 7;
-	request_resource(&ioport_resource, &rtc_iores);
-
-	maple_get_rtc_time(&tm);
-	return rtc_tm_to_time64(&tm);
-}
-
-- 
2.50.1