drm/amdgpu: GPU vs CPU page size fixes in amdgpu_vm_bo_split_mapping

start / last / max_entries are numbers of GPU pages, pfn / count are
numbers of CPU pages. Convert between them accordingly.

Fixes badness on systems with > 4K page size.

Cc: stable@vger.kernel.org
Bugzilla: https://bugs.freedesktop.org/106258
Reported-by: Matt Corallo <freedesktop@bluematt.me>
Tested-by: foxbat@ruin.net
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index b0eb2f5..edf16b2 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1463,7 +1463,9 @@ static int amdgpu_vm_bo_split_mapping(struct amdgpu_device *adev,
                        uint64_t count;
 
                        max_entries = min(max_entries, 16ull * 1024ull);
-                       for (count = 1; count < max_entries; ++count) {
+                       for (count = 1;
+                            count < max_entries / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE);
+                            ++count) {
                                uint64_t idx = pfn + count;
 
                                if (pages_addr[idx] !=
@@ -1476,7 +1478,7 @@ static int amdgpu_vm_bo_split_mapping(struct amdgpu_device *adev,
                                dma_addr = pages_addr;
                        } else {
                                addr = pages_addr[pfn];
-                               max_entries = count;
+                               max_entries = count * (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE);
                        }
 
                } else if (flags & AMDGPU_PTE_VALID) {
@@ -1491,7 +1493,7 @@ static int amdgpu_vm_bo_split_mapping(struct amdgpu_device *adev,
                if (r)
                        return r;
 
-               pfn += last - start + 1;
+               pfn += (last - start + 1) / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE);
                if (nodes && nodes->size == pfn) {
                        pfn = 0;
                        ++nodes;