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drm/bochs: Convert bochs driver to VRAM MM 

The data structure |struct drm_vram_mm| and its helpers replace bochs'
TTM-based memory manager. It's the same implementation; except for the
type names.

v5:
	* set .llseek via DRM_VRAM_MM_FILE_OPERATIONS
v4:
	* don't select DRM_TTM or DRM_VRAM_MM_HELPER
v3:
	* use drm_gem_vram_mm_funcs
	* convert driver to drm_device-based instance
v2:
	* implement bochs_mmap() with drm_vram_mm_mmap()

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20190508082630.15116-14-tzimmermann@suse.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Thomas Zimmermann 2019-05-08 10:26:23 +02:00 committed by Gerd Hoffmann
parent a3232987fd
commit b3a25b9af8
4 changed files with 11 additions and 166 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/bochs/Kconfig
View File

@ -2,7 +2,6 @@ config DRM_BOCHS
tristate "DRM Support for bochs dispi vga interface (qemu stdvga)"
depends on DRM && PCI && MMU
select DRM_KMS_HELPER
select DRM_TTM
select DRM_VRAM_HELPER
help
Choose this option for qemu.

13
drivers/gpu/drm/bochs/bochs.h
View File

@ -12,8 +12,7 @@
#include <drm/drm_gem.h>
#include <drm/drm_gem_vram_helper.h>
#include <drm/ttm/ttm_bo_driver.h>
#include <drm/ttm/ttm_page_alloc.h>
#include <drm/drm_vram_mm_helper.h>
/* ---------------------------------------------------------------------- */
@ -74,12 +73,6 @@ struct bochs_device {
struct drm_device *dev;
struct drm_simple_display_pipe pipe;
struct drm_connector connector;
/* ttm */
struct {
struct ttm_bo_device bdev;
bool initialized;
} ttm;
};
/* ---------------------------------------------------------------------- */
@ -99,10 +92,6 @@ int bochs_hw_load_edid(struct bochs_device *bochs);
/* bochs_mm.c */
int bochs_mm_init(struct bochs_device *bochs);
void bochs_mm_fini(struct bochs_device *bochs);
int bochs_mmap(struct file *filp, struct vm_area_struct *vma);
int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
struct drm_mode_create_dumb *args);
/* bochs_kms.c */
int bochs_kms_init(struct bochs_device *bochs);

15
drivers/gpu/drm/bochs/bochs_drv.c
View File

@ -63,14 +63,7 @@ static int bochs_load(struct drm_device *dev)
static const struct file_operations bochs_fops = {
.owner = THIS_MODULE,
.open = drm_open,
.release = drm_release,
.unlocked_ioctl = drm_ioctl,
.compat_ioctl = drm_compat_ioctl,
.poll = drm_poll,
.read = drm_read,
.llseek = no_llseek,
.mmap = bochs_mmap,
DRM_VRAM_MM_FILE_OPERATIONS
};
static struct drm_driver bochs_driver = {
@ -82,11 +75,7 @@ static struct drm_driver bochs_driver = {
.date = "20130925",
.major = 1,
.minor = 0,
.gem_free_object_unlocked =
drm_gem_vram_driver_gem_free_object_unlocked,
.dumb_create = bochs_dumb_create,
.dumb_map_offset = drm_gem_vram_driver_dumb_mmap_offset,
DRM_GEM_VRAM_DRIVER,
DRM_GEM_VRAM_DRIVER_PRIME,
};

148
drivers/gpu/drm/bochs/bochs_mm.c
View File

@ -9,155 +9,23 @@
/* ---------------------------------------------------------------------- */
static inline struct bochs_device *bochs_bdev(struct ttm_bo_device *bd)
{
return container_of(bd, struct bochs_device, ttm.bdev);
}
static int bochs_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
struct ttm_mem_type_manager *man)
{
switch (type) {
case TTM_PL_SYSTEM:
man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
man->available_caching = TTM_PL_MASK_CACHING;
man->default_caching = TTM_PL_FLAG_CACHED;
break;
case TTM_PL_VRAM:
man->func = &ttm_bo_manager_func;
man->flags = TTM_MEMTYPE_FLAG_FIXED |
TTM_MEMTYPE_FLAG_MAPPABLE;
man->available_caching = TTM_PL_FLAG_UNCACHED |
TTM_PL_FLAG_WC;
man->default_caching = TTM_PL_FLAG_WC;
break;
default:
DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
return -EINVAL;
}
return 0;
}
static int bochs_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
struct ttm_mem_reg *mem)
{
struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
struct bochs_device *bochs = bochs_bdev(bdev);
mem->bus.addr = NULL;
mem->bus.offset = 0;
mem->bus.size = mem->num_pages << PAGE_SHIFT;
mem->bus.base = 0;
mem->bus.is_iomem = false;
if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
return -EINVAL;
switch (mem->mem_type) {
case TTM_PL_SYSTEM:
/* system memory */
return 0;
case TTM_PL_VRAM:
mem->bus.offset = mem->start << PAGE_SHIFT;
mem->bus.base = bochs->fb_base;
mem->bus.is_iomem = true;
break;
default:
return -EINVAL;
break;
}
return 0;
}
static void bochs_ttm_io_mem_free(struct ttm_bo_device *bdev,
struct ttm_mem_reg *mem)
{
}
static void bochs_ttm_backend_destroy(struct ttm_tt *tt)
{
ttm_tt_fini(tt);
kfree(tt);
}
static struct ttm_backend_func bochs_tt_backend_func = {
.destroy = &bochs_ttm_backend_destroy,
};
static struct ttm_tt *bochs_ttm_tt_create(struct ttm_buffer_object *bo,
uint32_t page_flags)
{
struct ttm_tt *tt;
tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
if (tt == NULL)
return NULL;
tt->func = &bochs_tt_backend_func;
if (ttm_tt_init(tt, bo, page_flags)) {
kfree(tt);
return NULL;
}
return tt;
}
static struct ttm_bo_driver bochs_bo_driver = {
.ttm_tt_create = bochs_ttm_tt_create,
.init_mem_type = bochs_bo_init_mem_type,
.eviction_valuable = ttm_bo_eviction_valuable,
.evict_flags = drm_gem_vram_bo_driver_evict_flags,
.move = NULL,
.verify_access = drm_gem_vram_bo_driver_verify_access,
.io_mem_reserve = &bochs_ttm_io_mem_reserve,
.io_mem_free = &bochs_ttm_io_mem_free,
};
int bochs_mm_init(struct bochs_device *bochs)
{
struct ttm_bo_device *bdev = &bochs->ttm.bdev;
int ret;
struct drm_vram_mm *vmm;
ret = ttm_bo_device_init(&bochs->ttm.bdev,
&bochs_bo_driver,
bochs->dev->anon_inode->i_mapping,
true);
if (ret) {
DRM_ERROR("Error initialising bo driver; %d\n", ret);
return ret;
}
vmm = drm_vram_helper_alloc_mm(bochs->dev, bochs->fb_base,
bochs->fb_size,
&drm_gem_vram_mm_funcs);
if (IS_ERR(vmm))
return PTR_ERR(vmm);
ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
bochs->fb_size >> PAGE_SHIFT);
if (ret) {
DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
return ret;
}
bochs->ttm.initialized = true;
return 0;
}
void bochs_mm_fini(struct bochs_device *bochs)
{
if (!bochs->ttm.initialized)
if (!bochs->dev->vram_mm)
return;
ttm_bo_device_release(&bochs->ttm.bdev);
bochs->ttm.initialized = false;
}
int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_file *file_priv = filp->private_data;
struct bochs_device *bochs = file_priv->minor->dev->dev_private;
return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
}
/* ---------------------------------------------------------------------- */
int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
struct bochs_device *bochs = dev->dev_private;
return drm_gem_vram_fill_create_dumb(file, dev, &bochs->ttm.bdev, 0,
false, args);
drm_vram_helper_release_mm(bochs->dev);
}