| Message ID | 20200929151437.19717-6-tzimmermann@suse.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Support GEM object mappings from I/O memory | expand |
On Tue, Sep 29, 2020 at 05:14:35PM +0200, Thomas Zimmermann wrote: > Kernel DRM clients now store their framebuffer address in an instance > of struct dma_buf_map. Depending on the buffer's location, the address > refers to system or I/O memory. > > Callers of drm_client_buffer_vmap() receive a copy of the value in > the call's supplied arguments. It can be accessed and modified with > dma_buf_map interfaces. > > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> > --- > drivers/gpu/drm/drm_client.c | 34 +++++++++++++++++++-------------- > drivers/gpu/drm/drm_fb_helper.c | 23 +++++++++++++--------- > include/drm/drm_client.h | 7 ++++--- > 3 files changed, 38 insertions(+), 26 deletions(-) > > diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c > index ac0082bed966..fe573acf1067 100644 > --- a/drivers/gpu/drm/drm_client.c > +++ b/drivers/gpu/drm/drm_client.c > @@ -235,7 +235,7 @@ static void drm_client_buffer_delete(struct drm_client_buffer *buffer) > { > struct drm_device *dev = buffer->client->dev; > > - drm_gem_vunmap(buffer->gem, buffer->vaddr); > + drm_gem_vunmap(buffer->gem, &buffer->map); > > if (buffer->gem) > drm_gem_object_put(buffer->gem); > @@ -291,25 +291,31 @@ drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u > /** > * drm_client_buffer_vmap - Map DRM client buffer into address space > * @buffer: DRM client buffer > + * @map_copy: Returns the mapped memory's address > * > * This function maps a client buffer into kernel address space. If the > - * buffer is already mapped, it returns the mapping's address. > + * buffer is already mapped, it returns the existing mapping's address. > * > * Client buffer mappings are not ref'counted. Each call to > * drm_client_buffer_vmap() should be followed by a call to > * drm_client_buffer_vunmap(); or the client buffer should be mapped > * throughout its lifetime. > * > + * The returned address is a copy of the internal value. In contrast to > + * other vmap interfaces, you don't need it for the client's vunmap > + * function. So you can modify it at will during blit and draw operations. > + * > * Returns: > - * The mapped memory's address > + * 0 on success, or a negative errno code otherwise. > */ > -void *drm_client_buffer_vmap(struct drm_client_buffer *buffer) > +int > +drm_client_buffer_vmap(struct drm_client_buffer *buffer, struct dma_buf_map *map_copy) > { > - struct dma_buf_map map; > + struct dma_buf_map *map = &buffer->map; > int ret; > > - if (buffer->vaddr) > - return buffer->vaddr; > + if (dma_buf_map_is_set(map)) > + goto out; > > /* > * FIXME: The dependency on GEM here isn't required, we could > @@ -319,13 +325,14 @@ void *drm_client_buffer_vmap(struct drm_client_buffer *buffer) > * fd_install step out of the driver backend hooks, to make that > * final step optional for internal users. > */ > - ret = drm_gem_vmap(buffer->gem, &map); > + ret = drm_gem_vmap(buffer->gem, map); > if (ret) > - return ERR_PTR(ret); > + return ret; > > - buffer->vaddr = map.vaddr; > +out: > + *map_copy = *map; > > - return map.vaddr; > + return 0; > } > EXPORT_SYMBOL(drm_client_buffer_vmap); > > @@ -339,10 +346,9 @@ EXPORT_SYMBOL(drm_client_buffer_vmap); > */ > void drm_client_buffer_vunmap(struct drm_client_buffer *buffer) > { > - struct dma_buf_map map = DMA_BUF_MAP_INIT_VADDR(buffer->vaddr); > + struct dma_buf_map *map = &buffer->map; > > - drm_gem_vunmap(buffer->gem, &map); > - buffer->vaddr = NULL; > + drm_gem_vunmap(buffer->gem, map); > } > EXPORT_SYMBOL(drm_client_buffer_vunmap); > > diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c > index 8697554ccd41..343a292f2c7c 100644 > --- a/drivers/gpu/drm/drm_fb_helper.c > +++ b/drivers/gpu/drm/drm_fb_helper.c > @@ -394,7 +394,7 @@ static void drm_fb_helper_dirty_blit_real(struct drm_fb_helper *fb_helper, > unsigned int cpp = fb->format->cpp[0]; > size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp; > void *src = fb_helper->fbdev->screen_buffer + offset; > - void *dst = fb_helper->buffer->vaddr + offset; > + void *dst = fb_helper->buffer->map.vaddr + offset; > size_t len = (clip->x2 - clip->x1) * cpp; > unsigned int y; > > @@ -416,7 +416,8 @@ static void drm_fb_helper_dirty_work(struct work_struct *work) > struct drm_clip_rect *clip = &helper->dirty_clip; > struct drm_clip_rect clip_copy; > unsigned long flags; > - void *vaddr; > + struct dma_buf_map map; > + int ret; > > spin_lock_irqsave(&helper->dirty_lock, flags); > clip_copy = *clip; > @@ -429,8 +430,8 @@ static void drm_fb_helper_dirty_work(struct work_struct *work) > > /* Generic fbdev uses a shadow buffer */ > if (helper->buffer) { > - vaddr = drm_client_buffer_vmap(helper->buffer); > - if (IS_ERR(vaddr)) > + ret = drm_client_buffer_vmap(helper->buffer, &map); > + if (ret) > return; > drm_fb_helper_dirty_blit_real(helper, &clip_copy); > } > @@ -2076,7 +2077,8 @@ static int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper, > struct drm_framebuffer *fb; > struct fb_info *fbi; > u32 format; > - void *vaddr; > + struct dma_buf_map map; > + int ret; > > drm_dbg_kms(dev, "surface width(%d), height(%d) and bpp(%d)\n", > sizes->surface_width, sizes->surface_height, > @@ -2112,11 +2114,14 @@ static int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper, > fb_deferred_io_init(fbi); > } else { > /* buffer is mapped for HW framebuffer */ > - vaddr = drm_client_buffer_vmap(fb_helper->buffer); > - if (IS_ERR(vaddr)) > - return PTR_ERR(vaddr); > + ret = drm_client_buffer_vmap(fb_helper->buffer, &map); > + if (ret) > + return ret; > + if (map.is_iomem) > + fbi->screen_base = map.vaddr_iomem; > + else > + fbi->screen_buffer = map.vaddr; > > - fbi->screen_buffer = vaddr; > /* Shamelessly leak the physical address to user-space */ > #if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM) > if (drm_leak_fbdev_smem && fbi->fix.smem_start == 0) > diff --git a/include/drm/drm_client.h b/include/drm/drm_client.h > index 7aaea665bfc2..f07f2fb02e75 100644 > --- a/include/drm/drm_client.h > +++ b/include/drm/drm_client.h > @@ -3,6 +3,7 @@ > #ifndef _DRM_CLIENT_H_ > #define _DRM_CLIENT_H_ > > +#include <linux/dma-buf-map.h> > #include <linux/lockdep.h> > #include <linux/mutex.h> > #include <linux/types.h> > @@ -141,9 +142,9 @@ struct drm_client_buffer { > struct drm_gem_object *gem; > > /** > - * @vaddr: Virtual address for the buffer > + * @map: Virtual address for the buffer > */ > - void *vaddr; > + struct dma_buf_map map; > > /** > * @fb: DRM framebuffer > @@ -155,7 +156,7 @@ struct drm_client_buffer * > drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format); > void drm_client_framebuffer_delete(struct drm_client_buffer *buffer); > int drm_client_framebuffer_flush(struct drm_client_buffer *buffer, struct drm_rect *rect); > -void *drm_client_buffer_vmap(struct drm_client_buffer *buffer); > +int drm_client_buffer_vmap(struct drm_client_buffer *buffer, struct dma_buf_map *map); > void drm_client_buffer_vunmap(struct drm_client_buffer *buffer); > > int drm_client_modeset_create(struct drm_client_dev *client); Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> > -- > 2.28.0 >
diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c index ac0082bed966..fe573acf1067 100644 --- a/drivers/gpu/drm/drm_client.c +++ b/drivers/gpu/drm/drm_client.c @@ -235,7 +235,7 @@ static void drm_client_buffer_delete(struct drm_client_buffer *buffer) { struct drm_device *dev = buffer->client->dev; - drm_gem_vunmap(buffer->gem, buffer->vaddr); + drm_gem_vunmap(buffer->gem, &buffer->map); if (buffer->gem) drm_gem_object_put(buffer->gem); @@ -291,25 +291,31 @@ drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u /** * drm_client_buffer_vmap - Map DRM client buffer into address space * @buffer: DRM client buffer + * @map_copy: Returns the mapped memory's address * * This function maps a client buffer into kernel address space. If the - * buffer is already mapped, it returns the mapping's address. + * buffer is already mapped, it returns the existing mapping's address. * * Client buffer mappings are not ref'counted. Each call to * drm_client_buffer_vmap() should be followed by a call to * drm_client_buffer_vunmap(); or the client buffer should be mapped * throughout its lifetime. * + * The returned address is a copy of the internal value. In contrast to + * other vmap interfaces, you don't need it for the client's vunmap + * function. So you can modify it at will during blit and draw operations. + * * Returns: - * The mapped memory's address + * 0 on success, or a negative errno code otherwise. */ -void *drm_client_buffer_vmap(struct drm_client_buffer *buffer) +int +drm_client_buffer_vmap(struct drm_client_buffer *buffer, struct dma_buf_map *map_copy) { - struct dma_buf_map map; + struct dma_buf_map *map = &buffer->map; int ret; - if (buffer->vaddr) - return buffer->vaddr; + if (dma_buf_map_is_set(map)) + goto out; /* * FIXME: The dependency on GEM here isn't required, we could @@ -319,13 +325,14 @@ void *drm_client_buffer_vmap(struct drm_client_buffer *buffer) * fd_install step out of the driver backend hooks, to make that * final step optional for internal users. */ - ret = drm_gem_vmap(buffer->gem, &map); + ret = drm_gem_vmap(buffer->gem, map); if (ret) - return ERR_PTR(ret); + return ret; - buffer->vaddr = map.vaddr; +out: + *map_copy = *map; - return map.vaddr; + return 0; } EXPORT_SYMBOL(drm_client_buffer_vmap); @@ -339,10 +346,9 @@ EXPORT_SYMBOL(drm_client_buffer_vmap); */ void drm_client_buffer_vunmap(struct drm_client_buffer *buffer) { - struct dma_buf_map map = DMA_BUF_MAP_INIT_VADDR(buffer->vaddr); + struct dma_buf_map *map = &buffer->map; - drm_gem_vunmap(buffer->gem, &map); - buffer->vaddr = NULL; + drm_gem_vunmap(buffer->gem, map); } EXPORT_SYMBOL(drm_client_buffer_vunmap); diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 8697554ccd41..343a292f2c7c 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -394,7 +394,7 @@ static void drm_fb_helper_dirty_blit_real(struct drm_fb_helper *fb_helper, unsigned int cpp = fb->format->cpp[0]; size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp; void *src = fb_helper->fbdev->screen_buffer + offset; - void *dst = fb_helper->buffer->vaddr + offset; + void *dst = fb_helper->buffer->map.vaddr + offset; size_t len = (clip->x2 - clip->x1) * cpp; unsigned int y; @@ -416,7 +416,8 @@ static void drm_fb_helper_dirty_work(struct work_struct *work) struct drm_clip_rect *clip = &helper->dirty_clip; struct drm_clip_rect clip_copy; unsigned long flags; - void *vaddr; + struct dma_buf_map map; + int ret; spin_lock_irqsave(&helper->dirty_lock, flags); clip_copy = *clip; @@ -429,8 +430,8 @@ static void drm_fb_helper_dirty_work(struct work_struct *work) /* Generic fbdev uses a shadow buffer */ if (helper->buffer) { - vaddr = drm_client_buffer_vmap(helper->buffer); - if (IS_ERR(vaddr)) + ret = drm_client_buffer_vmap(helper->buffer, &map); + if (ret) return; drm_fb_helper_dirty_blit_real(helper, &clip_copy); } @@ -2076,7 +2077,8 @@ static int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper, struct drm_framebuffer *fb; struct fb_info *fbi; u32 format; - void *vaddr; + struct dma_buf_map map; + int ret; drm_dbg_kms(dev, "surface width(%d), height(%d) and bpp(%d)\n", sizes->surface_width, sizes->surface_height, @@ -2112,11 +2114,14 @@ static int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper, fb_deferred_io_init(fbi); } else { /* buffer is mapped for HW framebuffer */ - vaddr = drm_client_buffer_vmap(fb_helper->buffer); - if (IS_ERR(vaddr)) - return PTR_ERR(vaddr); + ret = drm_client_buffer_vmap(fb_helper->buffer, &map); + if (ret) + return ret; + if (map.is_iomem) + fbi->screen_base = map.vaddr_iomem; + else + fbi->screen_buffer = map.vaddr; - fbi->screen_buffer = vaddr; /* Shamelessly leak the physical address to user-space */ #if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM) if (drm_leak_fbdev_smem && fbi->fix.smem_start == 0) diff --git a/include/drm/drm_client.h b/include/drm/drm_client.h index 7aaea665bfc2..f07f2fb02e75 100644 --- a/include/drm/drm_client.h +++ b/include/drm/drm_client.h @@ -3,6 +3,7 @@ #ifndef _DRM_CLIENT_H_ #define _DRM_CLIENT_H_ +#include <linux/dma-buf-map.h> #include <linux/lockdep.h> #include <linux/mutex.h> #include <linux/types.h> @@ -141,9 +142,9 @@ struct drm_client_buffer { struct drm_gem_object *gem; /** - * @vaddr: Virtual address for the buffer + * @map: Virtual address for the buffer */ - void *vaddr; + struct dma_buf_map map; /** * @fb: DRM framebuffer @@ -155,7 +156,7 @@ struct drm_client_buffer * drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format); void drm_client_framebuffer_delete(struct drm_client_buffer *buffer); int drm_client_framebuffer_flush(struct drm_client_buffer *buffer, struct drm_rect *rect); -void *drm_client_buffer_vmap(struct drm_client_buffer *buffer); +int drm_client_buffer_vmap(struct drm_client_buffer *buffer, struct dma_buf_map *map); void drm_client_buffer_vunmap(struct drm_client_buffer *buffer); int drm_client_modeset_create(struct drm_client_dev *client);
Kernel DRM clients now store their framebuffer address in an instance of struct dma_buf_map. Depending on the buffer's location, the address refers to system or I/O memory. Callers of drm_client_buffer_vmap() receive a copy of the value in the call's supplied arguments. It can be accessed and modified with dma_buf_map interfaces. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> --- drivers/gpu/drm/drm_client.c | 34 +++++++++++++++++++-------------- drivers/gpu/drm/drm_fb_helper.c | 23 +++++++++++++--------- include/drm/drm_client.h | 7 ++++--- 3 files changed, 38 insertions(+), 26 deletions(-)