[PATCH 2/2] drm/amdgpu: Convert to ttm_bo_vmap() et al

[Thomas Zimmermann]

Replace each call to ttm_bo_kmap() with a call to ttm_bo_vmap().
Same for ttm_bo_kunmap() and ttm_bo_vunmap(). There's now one less
driver depending on the deprecated ttm_bo_kmap().

Also allows for dropping struct ttm_bo_kmap_obj in favor of struct
iosys_map, which is the preferred representation of BO memory mappings.
Manual type conversion in amdgpu_bo_kptr() is required to make the
returned pointer usable within amdgpu. In a follow-up patch, amdgpu
should be convert to use struct iosys_map directly.

Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 16 ++++++++++------
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h |  4 +++-
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index d58b11ea0ead5..baa60e25c13e1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -62,7 +62,7 @@ static void amdgpu_bo_destroy(struct ttm_buffer_object *tbo)
         * BO memory pages should be unmapped at this point. Call
         * amdgpu_bo_kunmap() before releasing the BO.
         */
-       if (drm_WARN_ON_ONCE(bo->tbo.base.dev, bo->kmap.bo))
+       if (drm_WARN_ON_ONCE(bo->tbo.base.dev, !iosys_map_is_null(&bo->map)))
                amdgpu_bo_kunmap(bo);
 
        if (bo->tbo.base.import_attach)
@@ -802,7 +802,7 @@ int amdgpu_bo_kmap(struct amdgpu_bo *bo, void **ptr)
                return 0;
        }
 
-       r = ttm_bo_kmap(&bo->tbo, 0, PFN_UP(bo->tbo.base.size), &bo->kmap);
+       r = ttm_bo_vmap(&bo->tbo, &bo->map);
        if (r)
                return r;
 
@@ -823,9 +823,12 @@ int amdgpu_bo_kmap(struct amdgpu_bo *bo, void **ptr)
  */
 void *amdgpu_bo_kptr(struct amdgpu_bo *bo)
 {
-       bool is_iomem;
+       if (iosys_map_is_null(&bo->map))
+               return NULL;
+       if (bo->map.is_iomem)
+               return (void __force *)bo->map.vaddr_iomem;
 
-       return ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
+       return bo->map.vaddr;
 }
 
 /**
@@ -836,8 +839,9 @@ void *amdgpu_bo_kptr(struct amdgpu_bo *bo)
  */
 void amdgpu_bo_kunmap(struct amdgpu_bo *bo)
 {
-       if (bo->kmap.bo)
-               ttm_bo_kunmap(&bo->kmap);
+       if (iosys_map_is_null(&bo->map))
+               return;
+       ttm_bo_vunmap(&bo->tbo, &bo->map);
 }
 
 /**
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
index bc42ccbde659a..553a92303339f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
@@ -28,6 +28,8 @@
 #ifndef __AMDGPU_OBJECT_H__
 #define __AMDGPU_OBJECT_H__
 
+#include <linux/iosys-map.h>
+
 #include <drm/amdgpu_drm.h>
 #include "amdgpu.h"
 #include "amdgpu_res_cursor.h"
@@ -99,7 +101,7 @@ struct amdgpu_bo {
        struct ttm_place                placements[AMDGPU_BO_MAX_PLACEMENTS];
        struct ttm_placement            placement;
        struct ttm_buffer_object        tbo;
-       struct ttm_bo_kmap_obj          kmap;
+       struct iosys_map                map;
        u64                             flags;
        /* per VM structure for page tables and with virtual addresses */
        struct amdgpu_vm_bo_base        *vm_bo;
-- 
2.45.2