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drm/vboxvideo: Use drm_gem_vram_vmap() interfaces

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VRAM helpers support ref counting for pin and vmap operations, no need
to avoid these operations by employing the internal kmap interface. Just
use drm_gem_vram_vmap() and let it handle the details.

Also unexport the kmap interfaces from VRAM helpers. Vboxvideo was the
last user of these internal functions.

v2:
	* fixed a comma in commit description

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200911075922.19317-1-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2020-09-11 09:59:22 +02:00
parent 5684daa713
commit d88656f475
3 changed files with 8 additions and 61 deletions
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56
drivers/gpu/drm/drm_gem_vram_helper.c
View File

@ -97,8 +97,8 @@ static const struct drm_gem_object_funcs drm_gem_vram_object_funcs;
* hardware's draing engine.
*
* To access a buffer object's memory from the DRM driver, call
* drm_gem_vram_kmap(). It (optionally) maps the buffer into kernel address
* space and returns the memory address. Use drm_gem_vram_kunmap() to
* drm_gem_vram_vmap(). It maps the buffer into kernel address
* space and returns the memory address. Use drm_gem_vram_vunmap() to
* release the mapping.
*/
@ -437,39 +437,6 @@ static void *drm_gem_vram_kmap_locked(struct drm_gem_vram_object *gbo,
return kmap->virtual;
}
/**
* drm_gem_vram_kmap() - Maps a GEM VRAM object into kernel address space
* @gbo: the GEM VRAM object
* @map: establish a mapping if necessary
* @is_iomem: returns true if the mapped memory is I/O memory, or false \
otherwise; can be NULL
*
* This function maps the buffer object into the kernel's address space
* or returns the current mapping. If the parameter map is false, the
* function only queries the current mapping, but does not establish a
* new one.
*
* Returns:
* The buffers virtual address if mapped, or
* NULL if not mapped, or
* an ERR_PTR()-encoded error code otherwise.
*/
void *drm_gem_vram_kmap(struct drm_gem_vram_object *gbo, bool map,
bool *is_iomem)
{
int ret;
void *virtual;
ret = ttm_bo_reserve(&gbo->bo, true, false, NULL);
if (ret)
return ERR_PTR(ret);
virtual = drm_gem_vram_kmap_locked(gbo, map, is_iomem);
ttm_bo_unreserve(&gbo->bo);
return virtual;
}
EXPORT_SYMBOL(drm_gem_vram_kmap);
static void drm_gem_vram_kunmap_locked(struct drm_gem_vram_object *gbo)
{
if (WARN_ON_ONCE(!gbo->kmap_use_count))
@ -485,22 +452,6 @@ static void drm_gem_vram_kunmap_locked(struct drm_gem_vram_object *gbo)
*/
}
/**
* drm_gem_vram_kunmap() - Unmaps a GEM VRAM object
* @gbo: the GEM VRAM object
*/
void drm_gem_vram_kunmap(struct drm_gem_vram_object *gbo)
{
int ret;
ret = ttm_bo_reserve(&gbo->bo, false, false, NULL);
if (WARN_ONCE(ret, "ttm_bo_reserve_failed(): ret=%d\n", ret))
return;
drm_gem_vram_kunmap_locked(gbo);
ttm_bo_unreserve(&gbo->bo);
}
EXPORT_SYMBOL(drm_gem_vram_kunmap);
/**
* drm_gem_vram_vmap() - Pins and maps a GEM VRAM object into kernel address
* space
@ -512,9 +463,6 @@ EXPORT_SYMBOL(drm_gem_vram_kunmap);
* permanently. Call drm_gem_vram_vunmap() with the returned address to
* unmap and unpin the GEM VRAM object.
*
* If you have special requirements for the pinning or mapping operations,
* call drm_gem_vram_pin() and drm_gem_vram_kmap() directly.
*
* Returns:
* The buffer's virtual address on success, or
* an ERR_PTR()-encoded error code otherwise.

10
drivers/gpu/drm/vboxvideo/vbox_mode.c
View File

@ -397,11 +397,13 @@ static void vbox_cursor_atomic_update(struct drm_plane *plane,
vbox_crtc->cursor_enabled = true;
/* pinning is done in prepare/cleanup framebuffer */
src = drm_gem_vram_kmap(gbo, true, NULL);
src = drm_gem_vram_vmap(gbo);
if (IS_ERR(src)) {
/*
* BUG: we should have pinned the BO in prepare_fb().
*/
mutex_unlock(&vbox->hw_mutex);
DRM_WARN("Could not kmap cursor bo, skipping update\n");
DRM_WARN("Could not map cursor bo, skipping update\n");
return;
}
@ -414,7 +416,7 @@ static void vbox_cursor_atomic_update(struct drm_plane *plane,
data_size = width * height * 4 + mask_size;
copy_cursor_image(src, vbox->cursor_data, width, height, mask_size);
drm_gem_vram_kunmap(gbo);
drm_gem_vram_vunmap(gbo, src);
flags = VBOX_MOUSE_POINTER_VISIBLE | VBOX_MOUSE_POINTER_SHAPE |
VBOX_MOUSE_POINTER_ALPHA;

3
include/drm/drm_gem_vram_helper.h
View File

@ -100,9 +100,6 @@ u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo);
s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo);
int drm_gem_vram_pin(struct drm_gem_vram_object *gbo, unsigned long pl_flag);
int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo);
void *drm_gem_vram_kmap(struct drm_gem_vram_object *gbo, bool map,
bool *is_iomem);
void drm_gem_vram_kunmap(struct drm_gem_vram_object *gbo);
void *drm_gem_vram_vmap(struct drm_gem_vram_object *gbo);
void drm_gem_vram_vunmap(struct drm_gem_vram_object *gbo, void *vaddr);