Get device pfns from BO's buddy blocks. Used in migrate_* core MM
functions called in GPU SVM to migrate between device and system memory.
v2:
- Use new drm_gpusvm_devmem_ops
v3:
- Better commit message (Thomas)
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@xxxxxxxxx>
Signed-off-by: Oak Zeng <oak.zeng@xxxxxxxxx>
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
Reviewed-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/xe/xe_svm.c | 40 +++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index dcd99520a6d9..16d526b2d19a 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -7,6 +7,7 @@
#include "xe_migrate.h"
#include "xe_pt.h"
#include "xe_svm.h"
+#include "xe_ttm_vram_mgr.h"
#include "xe_vm.h"
#include "xe_vm_types.h"
@@ -454,8 +455,47 @@ static int xe_svm_copy_to_ram(struct page **pages, dma_addr_t *dma_addr,
return xe_svm_copy(pages, dma_addr, npages, XE_SVM_COPY_TO_SRAM);
}
+static struct xe_bo *to_xe_bo(struct drm_gpusvm_devmem *devmem_allocation)
+{
+ return container_of(devmem_allocation, struct xe_bo, devmem_allocation);
+}
+
+static u64 block_offset_to_pfn(struct xe_mem_region *mr, u64 offset)
+{
+ return PHYS_PFN(offset + mr->hpa_base);
+}
+
+static struct drm_buddy *tile_to_buddy(struct xe_tile *tile)
+{
+ return &tile->mem.vram_mgr->mm;
+}
+
+static int xe_svm_populate_devmem_pfn(struct drm_gpusvm_devmem *devmem_allocation,
+ unsigned long npages, unsigned long *pfn)
+{
+ struct xe_bo *bo = to_xe_bo(devmem_allocation);
+ struct ttm_resource *res = bo->ttm.resource;
+ struct list_head *blocks = &to_xe_ttm_vram_mgr_resource(res)->blocks;
+ struct drm_buddy_block *block;
+ int j = 0;
+
+ list_for_each_entry(block, blocks, link) {
+ struct xe_mem_region *mr = block->private;
+ struct xe_tile *tile = mr_to_tile(mr);
+ struct drm_buddy *buddy = tile_to_buddy(tile);
+ u64 block_pfn = block_offset_to_pfn(mr, drm_buddy_block_offset(block));
+ int i;
+
+ for (i = 0; i < drm_buddy_block_size(buddy, block) >> PAGE_SHIFT; ++i)
+ pfn[j++] = block_pfn + i;
+ }
+
+ return 0;
+}
+
__maybe_unused
static const struct drm_gpusvm_devmem_ops gpusvm_devmem_ops = {
+ .populate_devmem_pfn = xe_svm_populate_devmem_pfn,
.copy_to_devmem = xe_svm_copy_to_devmem,
.copy_to_ram = xe_svm_copy_to_ram,
};
--
2.34.1
