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drm: Add simple PRIME helpers for GEM VRAM 

These basic helper functions for GEM VRAM allow for pinning and mapping
GEM VRAM objects via the PRIME interfaces. It's not a full implementation,
but complete enough for generic fbcon.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20190508082630.15116-6-tzimmermann@suse.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Thomas Zimmermann 2019-05-08 10:26:15 +02:00 committed by Gerd Hoffmann
parent fed1eec080
commit 1f460b4978
2 changed files with 118 additions and 0 deletions
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98
drivers/gpu/drm/drm_gem_vram_helper.c
View File

@ -2,6 +2,7 @@
#include <drm/drm_gem_vram_helper.h>
#include <drm/drm_mode.h>
#include <drm/drm_prime.h>
#include <drm/ttm/ttm_page_alloc.h>
/**
@ -571,3 +572,100 @@ int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file,
return 0;
}
EXPORT_SYMBOL(drm_gem_vram_driver_dumb_mmap_offset);
/*
* PRIME helpers for struct drm_driver
*/
/**
* drm_gem_vram_driver_gem_prime_pin() - \
Implements &struct drm_driver.gem_prime_pin
* @gem: The GEM object to pin
*
* Returns:
* 0 on success, or
* a negative errno code otherwise.
*/
int drm_gem_vram_driver_gem_prime_pin(struct drm_gem_object *gem)
{
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
return drm_gem_vram_pin(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM);
}
EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_pin);
/**
* drm_gem_vram_driver_gem_prime_unpin() - \
Implements &struct drm_driver.gem_prime_unpin
* @gem: The GEM object to unpin
*/
void drm_gem_vram_driver_gem_prime_unpin(struct drm_gem_object *gem)
{
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
drm_gem_vram_unpin(gbo);
}
EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_unpin);
/**
* drm_gem_vram_driver_gem_prime_vmap() - \
Implements &struct drm_driver.gem_prime_vmap
* @gem: The GEM object to map
*
* Returns:
* The buffers virtual address on success, or
* NULL otherwise.
*/
void *drm_gem_vram_driver_gem_prime_vmap(struct drm_gem_object *gem)
{
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
int ret;
void *base;
ret = drm_gem_vram_pin(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM);
if (ret)
return NULL;
base = drm_gem_vram_kmap(gbo, true, NULL);
if (IS_ERR(base)) {
drm_gem_vram_unpin(gbo);
return NULL;
}
return base;
}
EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_vmap);
/**
* drm_gem_vram_driver_gem_prime_vunmap() - \
Implements &struct drm_driver.gem_prime_vunmap
* @gem: The GEM object to unmap
* @vaddr: The mapping's base address
*/
void drm_gem_vram_driver_gem_prime_vunmap(struct drm_gem_object *gem,
void *vaddr)
{
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
drm_gem_vram_kunmap(gbo);
drm_gem_vram_unpin(gbo);
}
EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_vunmap);
/**
* drm_gem_vram_driver_gem_prime_mmap() - \
Implements &struct drm_driver.gem_prime_mmap
* @gem: The GEM object to map
* @vma: The VMA describing the mapping
*
* Returns:
* 0 on success, or
* a negative errno code otherwise.
*/
int drm_gem_vram_driver_gem_prime_mmap(struct drm_gem_object *gem,
struct vm_area_struct *vma)
{
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
gbo->gem.vma_node.vm_node.start = gbo->bo.vma_node.vm_node.start;
return drm_gem_prime_mmap(gem, vma);
}
EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_mmap);

20
include/drm/drm_gem_vram_helper.h
View File

@ -116,5 +116,25 @@ void drm_gem_vram_driver_gem_free_object_unlocked(struct drm_gem_object *gem);
int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file,
struct drm_device *dev,
uint32_t handle, uint64_t *offset);
/*
* PRIME helpers for struct drm_driver
*/
int drm_gem_vram_driver_gem_prime_pin(struct drm_gem_object *obj);
void drm_gem_vram_driver_gem_prime_unpin(struct drm_gem_object *obj);
void *drm_gem_vram_driver_gem_prime_vmap(struct drm_gem_object *obj);
void drm_gem_vram_driver_gem_prime_vunmap(struct drm_gem_object *obj,
void *vaddr);
int drm_gem_vram_driver_gem_prime_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma);
#define DRM_GEM_VRAM_DRIVER_PRIME \
.gem_prime_export = drm_gem_prime_export, \
.gem_prime_import = drm_gem_prime_import, \
.gem_prime_pin = drm_gem_vram_driver_gem_prime_pin, \
.gem_prime_unpin = drm_gem_vram_driver_gem_prime_unpin, \
.gem_prime_vmap = drm_gem_vram_driver_gem_prime_vmap, \
.gem_prime_vunmap = drm_gem_vram_driver_gem_prime_vunmap, \
.gem_prime_mmap = drm_gem_vram_driver_gem_prime_mmap
#endif