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drm/fbdev-ttm: Support struct drm_driver.fbdev_probe

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Rework fbdev probing to support fbdev_probe in struct drm_driver
and reimplement the old fb_probe callback on top of it. Provide an
initializer macro for struct drm_driver that sets the callback
according to the kernel configuration.

This change allows the common fbdev client to run on top of TTM-
based DRM drivers.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240924071734.98201-65-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2024-09-24 09:13:02 +02:00
parent bf0978203a
commit c7c1b9e1d5
2 changed files with 90 additions and 65 deletions
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142
drivers/gpu/drm/drm_fbdev_ttm.c
View File

@ -71,71 +71,7 @@ static const struct fb_ops drm_fbdev_ttm_fb_ops = {
static int drm_fbdev_ttm_helper_fb_probe(struct drm_fb_helper *fb_helper,
struct drm_fb_helper_surface_size *sizes)
{
struct drm_client_dev *client = &fb_helper->client;
struct drm_device *dev = fb_helper->dev;
struct drm_client_buffer *buffer;
struct fb_info *info;
size_t screen_size;
void *screen_buffer;
u32 format;
int ret;
drm_dbg_kms(dev, "surface width(%d), height(%d) and bpp(%d)\n",
sizes->surface_width, sizes->surface_height,
sizes->surface_bpp);
format = drm_driver_legacy_fb_format(dev, sizes->surface_bpp,
sizes->surface_depth);
buffer = drm_client_framebuffer_create(client, sizes->surface_width,
sizes->surface_height, format);
if (IS_ERR(buffer))
return PTR_ERR(buffer);
fb_helper->buffer = buffer;
fb_helper->fb = buffer->fb;
screen_size = buffer->gem->size;
screen_buffer = vzalloc(screen_size);
if (!screen_buffer) {
ret = -ENOMEM;
goto err_drm_client_framebuffer_delete;
}
info = drm_fb_helper_alloc_info(fb_helper);
if (IS_ERR(info)) {
ret = PTR_ERR(info);
goto err_vfree;
}
drm_fb_helper_fill_info(info, fb_helper, sizes);
info->fbops = &drm_fbdev_ttm_fb_ops;
/* screen */
info->flags |= FBINFO_VIRTFB | FBINFO_READS_FAST;
info->screen_buffer = screen_buffer;
info->fix.smem_len = screen_size;
/* deferred I/O */
fb_helper->fbdefio.delay = HZ / 20;
fb_helper->fbdefio.deferred_io = drm_fb_helper_deferred_io;
info->fbdefio = &fb_helper->fbdefio;
ret = fb_deferred_io_init(info);
if (ret)
goto err_drm_fb_helper_release_info;
return 0;
err_drm_fb_helper_release_info:
drm_fb_helper_release_info(fb_helper);
err_vfree:
vfree(screen_buffer);
err_drm_client_framebuffer_delete:
fb_helper->fb = NULL;
fb_helper->buffer = NULL;
drm_client_framebuffer_delete(buffer);
return ret;
return drm_fbdev_ttm_driver_fbdev_probe(fb_helper, sizes);
}
static void drm_fbdev_ttm_damage_blit_real(struct drm_fb_helper *fb_helper,
@ -240,6 +176,82 @@ static const struct drm_fb_helper_funcs drm_fbdev_ttm_helper_funcs = {
.fb_dirty = drm_fbdev_ttm_helper_fb_dirty,
};
/*
* struct drm_driver
*/
int drm_fbdev_ttm_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
struct drm_fb_helper_surface_size *sizes)
{
struct drm_client_dev *client = &fb_helper->client;
struct drm_device *dev = fb_helper->dev;
struct drm_client_buffer *buffer;
struct fb_info *info;
size_t screen_size;
void *screen_buffer;
u32 format;
int ret;
drm_dbg_kms(dev, "surface width(%d), height(%d) and bpp(%d)\n",
sizes->surface_width, sizes->surface_height,
sizes->surface_bpp);
format = drm_driver_legacy_fb_format(dev, sizes->surface_bpp,
sizes->surface_depth);
buffer = drm_client_framebuffer_create(client, sizes->surface_width,
sizes->surface_height, format);
if (IS_ERR(buffer))
return PTR_ERR(buffer);
fb_helper->funcs = &drm_fbdev_ttm_helper_funcs;
fb_helper->buffer = buffer;
fb_helper->fb = buffer->fb;
screen_size = buffer->gem->size;
screen_buffer = vzalloc(screen_size);
if (!screen_buffer) {
ret = -ENOMEM;
goto err_drm_client_framebuffer_delete;
}
info = drm_fb_helper_alloc_info(fb_helper);
if (IS_ERR(info)) {
ret = PTR_ERR(info);
goto err_vfree;
}
drm_fb_helper_fill_info(info, fb_helper, sizes);
info->fbops = &drm_fbdev_ttm_fb_ops;
/* screen */
info->flags |= FBINFO_VIRTFB | FBINFO_READS_FAST;
info->screen_buffer = screen_buffer;
info->fix.smem_len = screen_size;
/* deferred I/O */
fb_helper->fbdefio.delay = HZ / 20;
fb_helper->fbdefio.deferred_io = drm_fb_helper_deferred_io;
info->fbdefio = &fb_helper->fbdefio;
ret = fb_deferred_io_init(info);
if (ret)
goto err_drm_fb_helper_release_info;
return 0;
err_drm_fb_helper_release_info:
drm_fb_helper_release_info(fb_helper);
err_vfree:
vfree(screen_buffer);
err_drm_client_framebuffer_delete:
fb_helper->fb = NULL;
fb_helper->buffer = NULL;
drm_client_framebuffer_delete(buffer);
return ret;
}
EXPORT_SYMBOL(drm_fbdev_ttm_driver_fbdev_probe);
static void drm_fbdev_ttm_client_unregister(struct drm_client_dev *client)
{
struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);

13
include/drm/drm_fbdev_ttm.h
View File

@ -3,11 +3,24 @@
#ifndef DRM_FBDEV_TTM_H
#define DRM_FBDEV_TTM_H
#include <linux/stddef.h>
struct drm_device;
struct drm_fb_helper;
struct drm_fb_helper_surface_size;
#ifdef CONFIG_DRM_FBDEV_EMULATION
int drm_fbdev_ttm_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
struct drm_fb_helper_surface_size *sizes);
#define DRM_FBDEV_TTM_DRIVER_OPS \
.fbdev_probe = drm_fbdev_ttm_driver_fbdev_probe
void drm_fbdev_ttm_setup(struct drm_device *dev, unsigned int preferred_bpp);
#else
#define DRM_FBDEV_TTM_DRIVER_OPS \
.fbdev_probe = NULL
static inline void drm_fbdev_ttm_setup(struct drm_device *dev, unsigned int preferred_bpp)
{ }
#endif