Re: [PATCH 2/6] drm/ttm: Store the bo_kmap_type in struct iosys_map

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Am 14.06.24 um 15:21 schrieb Thomas Zimmermann:
For each instances of struct iosys_map set up by ttm_bo_vmap(), store
the type of allocation in the instance. Use this information to unmap
the memory in ttm_bo_vunmap(). This change simplifies the unmap code
and puts the complicated logic entirely into the map code.

I'm not sure that's a good idea.

The mapping information should already be available in the resource and storing it in the iosys_map structures duplicates that information.

So we might run into the issue that the resource has changed and so we need a different approach now, but the iosys_map will say that we should unmap things for example.

Regards,
Christian.


Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
  drivers/gpu/drm/ttm/ttm_bo_util.c | 46 +++++++++++++++++++++----------
  1 file changed, 31 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index 0b3f4267130c4..a9df0deff2deb 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -36,6 +36,7 @@
  #include <drm/ttm/ttm_tt.h>
#include <drm/drm_cache.h>
+#include <drm/drm_device.h>
struct ttm_transfer_obj {
  	struct ttm_buffer_object base;
@@ -479,24 +480,29 @@ int ttm_bo_vmap(struct ttm_buffer_object *bo, struct iosys_map *map)
if (mem->bus.is_iomem) {
  		void __iomem *vaddr_iomem;
+		u16 alloc_flags;
- if (mem->bus.addr)
+		if (mem->bus.addr) {
  			vaddr_iomem = (void __iomem *)mem->bus.addr;
-		else if (mem->bus.caching == ttm_write_combined)
-			vaddr_iomem = ioremap_wc(mem->bus.offset,
-						 bo->base.size);
+			alloc_flags = ttm_bo_map_premapped;
+		} else if (mem->bus.caching == ttm_write_combined) {
+			vaddr_iomem = ioremap_wc(mem->bus.offset, bo->base.size);
+			alloc_flags = ttm_bo_map_iomap;
  #ifdef CONFIG_X86
-		else if (mem->bus.caching == ttm_cached)
-			vaddr_iomem = ioremap_cache(mem->bus.offset,
-						  bo->base.size);
+		} else if (mem->bus.caching == ttm_cached) {
+			vaddr_iomem = ioremap_cache(mem->bus.offset, bo->base.size);
+			alloc_flags = ttm_bo_map_iomap;
  #endif
-		else
+		} else {
  			vaddr_iomem = ioremap(mem->bus.offset, bo->base.size);
+			alloc_flags = ttm_bo_map_iomap;
+		}
if (!vaddr_iomem)
  			return -ENOMEM;
iosys_map_set_vaddr_iomem(map, vaddr_iomem);
+		map->alloc_flags = alloc_flags;
} else {
  		struct ttm_operation_ctx ctx = {
@@ -506,6 +512,7 @@ int ttm_bo_vmap(struct ttm_buffer_object *bo, struct iosys_map *map)
  		struct ttm_tt *ttm = bo->ttm;
  		pgprot_t prot;
  		void *vaddr;
+		u16 alloc_flags;
ret = ttm_tt_populate(bo->bdev, ttm, &ctx);
  		if (ret)
@@ -519,8 +526,10 @@ int ttm_bo_vmap(struct ttm_buffer_object *bo, struct iosys_map *map)
  		vaddr = vmap(ttm->pages, ttm->num_pages, 0, prot);
  		if (!vaddr)
  			return -ENOMEM;
+		alloc_flags = ttm_bo_map_vmap;
iosys_map_set_vaddr(map, vaddr);
+		map->alloc_flags = alloc_flags;
  	}
return 0;
@@ -537,20 +546,27 @@ EXPORT_SYMBOL(ttm_bo_vmap);
   */
  void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct iosys_map *map)
  {
-	struct ttm_resource *mem = bo->resource;
-
  	dma_resv_assert_held(bo->base.resv);
if (iosys_map_is_null(map))
  		return;
- if (!map->is_iomem)
-		vunmap(map->vaddr);
-	else if (!mem->bus.addr)
+	switch (map->alloc_flags) {
+	case ttm_bo_map_iomap:
  		iounmap(map->vaddr_iomem);
-	iosys_map_clear(map);
-
+		break;
+	case ttm_bo_map_vmap:
+		vunmap(map->vaddr);
+		break;
+	case ttm_bo_map_premapped:
+		break;
+	default:
+		drm_err(bo->base.dev, "Unsupported alloc_flags 0x%x\n", map->alloc_flags);
+		return;
+	}
  	ttm_mem_io_free(bo->bdev, bo->resource);
+
+	iosys_map_clear(map);
  }
  EXPORT_SYMBOL(ttm_bo_vunmap);




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