drm/amdgpu/ttm: Add New AMDGPU_PL_MMIO_REMAP Placement

Introduce a kernel-internal TTM placement type AMDGPU_PL_MMIO_REMAP
for the HDP flush MMIO remap page

Plumbing added:
- amdgpu_res_cursor.{first,next}: treat MMIO_REMAP like DOORBELL
- amdgpu_ttm_io_mem_reserve(): return BAR bus address + offset
  for MMIO_REMAP, mark as uncached I/O
- amdgpu_ttm_io_mem_pfn(): PFN from register BAR
- amdgpu_res_cpu_visible(): visible to CPU
- amdgpu_evict_flags()/amdgpu_bo_move(): non-migratable
- amdgpu_ttm_tt_pde_flags(): map as SYSTEM
- amdgpu_bo_mem_stats_placement(): report AMDGPU_PL_MMIO_REMAP
- amdgpu_fdinfo: print “mmioremap” bucket label

Cc: Alex Deucher <alexander.deucher@amd.com>
Suggested-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
index 2309df3f68a9cb54464398b5676082a0ca594aad..bb17987f0447f17b535f9ee5f9bb7ced8e8e1122 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
@@ -34,7 +34,8 @@
 #define AMDGPU_PL_OA           (TTM_PL_PRIV + 2)
 #define AMDGPU_PL_PREEMPT      (TTM_PL_PRIV + 3)
 #define AMDGPU_PL_DOORBELL     (TTM_PL_PRIV + 4)
-#define __AMDGPU_PL_NUM        (TTM_PL_PRIV + 5)
+#define AMDGPU_PL_MMIO_REMAP   (TTM_PL_PRIV + 5)
+#define __AMDGPU_PL_NUM        (TTM_PL_PRIV + 6)
 
 #define AMDGPU_GTT_MAX_TRANSFER_SIZE   512
 #define AMDGPU_GTT_NUM_TRANSFER_WINDOWS        2