xtensa: disable preemption around cache alias management calls

commit 3a860d165eb5f4d7cf0bf81ef6a5b5c5e1754422 upstream.

Although cache alias management calls set up and tear down TLB entries
and fast_second_level_miss is able to restore TLB entry should it be
evicted they absolutely cannot preempt each other because they use the
same TLBTEMP area for different purposes.
Disable preemption around all cache alias management calls to enforce
that.

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/xtensa/mm/cache.c b/arch/xtensa/mm/cache.c
index 3c75c4e597da8f086f65de51201e0d37d6672733..7aaedeebb35ddf2b6fc9463e7186597455c6d0d3 100644 (file)
--- a/arch/xtensa/mm/cache.c
+++ b/arch/xtensa/mm/cache.c
@@ -74,8 +74,10 @@ static inline void kmap_invalidate_coherent(struct page *page,
                        kvaddr = TLBTEMP_BASE_1 +
                                (page_to_phys(page) & DCACHE_ALIAS_MASK);
 
+                       preempt_disable();
                        __invalidate_dcache_page_alias(kvaddr,
                                                       page_to_phys(page));
+                       preempt_enable();
                }
        }
 }
@@ -160,6 +162,7 @@ void flush_dcache_page(struct page *page)
                if (!alias && !mapping)
                        return;
 
+               preempt_disable();
                virt = TLBTEMP_BASE_1 + (phys & DCACHE_ALIAS_MASK);
                __flush_invalidate_dcache_page_alias(virt, phys);
 
@@ -170,6 +173,7 @@ void flush_dcache_page(struct page *page)
 
                if (mapping)
                        __invalidate_icache_page_alias(virt, phys);
+               preempt_enable();
        }
 
        /* There shouldn't be an entry in the cache for this page anymore. */
@@ -203,8 +207,10 @@ void local_flush_cache_page(struct vm_area_struct *vma, unsigned long address,
        unsigned long phys = page_to_phys(pfn_to_page(pfn));
        unsigned long virt = TLBTEMP_BASE_1 + (address & DCACHE_ALIAS_MASK);
 
+       preempt_disable();
        __flush_invalidate_dcache_page_alias(virt, phys);
        __invalidate_icache_page_alias(virt, phys);
+       preempt_enable();
 }
 EXPORT_SYMBOL(local_flush_cache_page);
 
@@ -231,11 +237,13 @@ update_mmu_cache(struct vm_area_struct * vma, unsigned long addr, pte_t *ptep)
                unsigned long phys = page_to_phys(page);
                unsigned long tmp;
 
+               preempt_disable();
                tmp = TLBTEMP_BASE_1 + (phys & DCACHE_ALIAS_MASK);
                __flush_invalidate_dcache_page_alias(tmp, phys);
                tmp = TLBTEMP_BASE_1 + (addr & DCACHE_ALIAS_MASK);
                __flush_invalidate_dcache_page_alias(tmp, phys);
                __invalidate_icache_page_alias(tmp, phys);
+               preempt_enable();
 
                clear_bit(PG_arch_1, &page->flags);
        }
@@ -269,7 +277,9 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
 
        if (alias) {
                unsigned long t = TLBTEMP_BASE_1 + (vaddr & DCACHE_ALIAS_MASK);
+               preempt_disable();
                __flush_invalidate_dcache_page_alias(t, phys);
+               preempt_enable();
        }
 
        /* Copy data */
@@ -284,9 +294,11 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
        if (alias) {
                unsigned long t = TLBTEMP_BASE_1 + (vaddr & DCACHE_ALIAS_MASK);
 
+               preempt_disable();
                __flush_invalidate_dcache_range((unsigned long) dst, len);
                if ((vma->vm_flags & VM_EXEC) != 0)
                        __invalidate_icache_page_alias(t, phys);
+               preempt_enable();
 
        } else if ((vma->vm_flags & VM_EXEC) != 0) {
                __flush_dcache_range((unsigned long)dst,len);
@@ -308,7 +320,9 @@ extern void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
 
        if (alias) {
                unsigned long t = TLBTEMP_BASE_1 + (vaddr & DCACHE_ALIAS_MASK);
+               preempt_disable();
                __flush_invalidate_dcache_page_alias(t, phys);
+               preempt_enable();
        }
 
        memcpy(dst, src, len);