(cc: danvet) Hi
Am 22.11.22 um 21:58 schrieb Noralf Trønnes via B4 Submission Endpoint:
From: Noralf Trønnes <[email protected]> Complete the shadow fb access functions by also preparing imported buffers for CPU access. Update the affected drivers that currently use drm_gem_fb_begin_cpu_access(). Through this change the following SHMEM drivers will now also make sure their imported buffers are prepared for CPU access: cirrus, hyperv, mgag200, vkms
I had a similar patch recently, but Daniel shot it down. AFAIR begin_cpu_access *somehow* interferes with *something* and that can leads to *problems.* Sorry that's the best I remember. Daniel should know. :D
Best regards Thomas
Cc: Thomas Zimmermann <[email protected]> Cc: Javier Martinez Canillas <[email protected]> Cc: Hans de Goede <[email protected]> Cc: Dave Airlie <[email protected]> Signed-off-by: Noralf Trønnes <[email protected]> --- drivers/gpu/drm/drm_gem_atomic_helper.c | 13 ++++++++++++- drivers/gpu/drm/solomon/ssd130x.c | 10 +--------- drivers/gpu/drm/tiny/gm12u320.c | 10 +--------- drivers/gpu/drm/tiny/ofdrm.c | 10 ++-------- drivers/gpu/drm/tiny/simpledrm.c | 10 ++-------- drivers/gpu/drm/udl/udl_modeset.c | 11 ++--------- 6 files changed, 20 insertions(+), 44 deletions(-) diff --git a/drivers/gpu/drm/drm_gem_atomic_helper.c b/drivers/gpu/drm/drm_gem_atomic_helper.c index e42800718f51..0eef4bb30d25 100644 --- a/drivers/gpu/drm/drm_gem_atomic_helper.c +++ b/drivers/gpu/drm/drm_gem_atomic_helper.c @@ -368,6 +368,7 @@ EXPORT_SYMBOL(drm_gem_reset_shadow_plane); * maps all buffer objects of the plane's framebuffer into kernel address * space and stores them in struct &drm_shadow_plane_state.map. The first data * bytes are available in struct &drm_shadow_plane_state.data. + * It also prepares imported buffers for CPU access. * * See drm_gem_end_shadow_fb_access() for cleanup. * @@ -378,11 +379,20 @@ int drm_gem_begin_shadow_fb_access(struct drm_plane *plane, struct drm_plane_sta { struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state); struct drm_framebuffer *fb = plane_state->fb; + int ret;if (!fb)return 0;- return drm_gem_fb_vmap(fb, shadow_plane_state->map, shadow_plane_state->data);+ ret = drm_gem_fb_vmap(fb, shadow_plane_state->map, shadow_plane_state->data); + if (ret) + return ret; + + ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE); + if (ret) + drm_gem_fb_vunmap(fb, shadow_plane_state->map); + + return ret; } EXPORT_SYMBOL(drm_gem_begin_shadow_fb_access);@@ -404,6 +414,7 @@ void drm_gem_end_shadow_fb_access(struct drm_plane *plane, struct drm_plane_statif (!fb) return;+ drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);drm_gem_fb_vunmap(fb, shadow_plane_state->map); } EXPORT_SYMBOL(drm_gem_end_shadow_fb_access); diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c index 53464afc2b9a..58a2f0113f24 100644 --- a/drivers/gpu/drm/solomon/ssd130x.c +++ b/drivers/gpu/drm/solomon/ssd130x.c @@ -544,7 +544,6 @@ static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb, const struct iosys_m struct ssd130x_device *ssd130x = drm_to_ssd130x(fb->dev); struct iosys_map dst; unsigned int dst_pitch; - int ret = 0; u8 *buf = NULL;/* Align y to display page boundaries */@@ -556,21 +555,14 @@ static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb, const struct iosys_m if (!buf) return -ENOMEM;- ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);- if (ret) - goto out_free; - iosys_map_set_vaddr(&dst, buf); drm_fb_xrgb8888_to_mono(&dst, &dst_pitch, vmap, fb, rect);- drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);- ssd130x_update_rect(ssd130x, buf, rect);-out_free:kfree(buf);- return ret;+ return 0; }static void ssd130x_primary_plane_helper_atomic_update(struct drm_plane *plane,diff --git a/drivers/gpu/drm/tiny/gm12u320.c b/drivers/gpu/drm/tiny/gm12u320.c index 130fd07a967d..59aad4b468cc 100644 --- a/drivers/gpu/drm/tiny/gm12u320.c +++ b/drivers/gpu/drm/tiny/gm12u320.c @@ -252,7 +252,7 @@ static void gm12u320_32bpp_to_24bpp_packed(u8 *dst, u8 *src, int len)static void gm12u320_copy_fb_to_blocks(struct gm12u320_device *gm12u320){ - int block, dst_offset, len, remain, ret, x1, x2, y1, y2; + int block, dst_offset, len, remain, x1, x2, y1, y2; struct drm_framebuffer *fb; void *vaddr; u8 *src; @@ -269,12 +269,6 @@ static void gm12u320_copy_fb_to_blocks(struct gm12u320_device *gm12u320) y2 = gm12u320->fb_update.rect.y2; vaddr = gm12u320->fb_update.src_map.vaddr; /* TODO: Use mapping abstraction properly */- ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);- if (ret) { - GM12U320_ERR("drm_gem_fb_begin_cpu_access err: %d\n", ret); - goto put_fb; - } - src = vaddr + y1 * fb->pitches[0] + x1 * 4;x1 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;@@ -309,8 +303,6 @@ static void gm12u320_copy_fb_to_blocks(struct gm12u320_device *gm12u320) src += fb->pitches[0]; }- drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);-put_fb: drm_framebuffer_put(fb); gm12u320->fb_update.fb = NULL; unlock: diff --git a/drivers/gpu/drm/tiny/ofdrm.c b/drivers/gpu/drm/tiny/ofdrm.c index dc9e4d71b12a..ed3072563db9 100644 --- a/drivers/gpu/drm/tiny/ofdrm.c +++ b/drivers/gpu/drm/tiny/ofdrm.c @@ -820,14 +820,10 @@ static void ofdrm_primary_plane_helper_atomic_update(struct drm_plane *plane, const struct drm_format_info *dst_format = odev->format; struct drm_atomic_helper_damage_iter iter; struct drm_rect damage; - int ret, idx; - - ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE); - if (ret) - return; + int idx;if (!drm_dev_enter(dev, &idx))- goto out_drm_gem_fb_end_cpu_access; + return;drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);drm_atomic_for_each_plane_damage(&iter, &damage) { @@ -843,8 +839,6 @@ static void ofdrm_primary_plane_helper_atomic_update(struct drm_plane *plane, }drm_dev_exit(idx);-out_drm_gem_fb_end_cpu_access: - drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE); }static void ofdrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c index 162eb44dcba8..1c0d9e277dc3 100644 --- a/drivers/gpu/drm/tiny/simpledrm.c +++ b/drivers/gpu/drm/tiny/simpledrm.c @@ -481,14 +481,10 @@ static void simpledrm_primary_plane_helper_atomic_update(struct drm_plane *plane struct simpledrm_device *sdev = simpledrm_device_of_dev(dev); struct drm_atomic_helper_damage_iter iter; struct drm_rect damage; - int ret, idx; - - ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE); - if (ret) - return; + int idx;if (!drm_dev_enter(dev, &idx))- goto out_drm_gem_fb_end_cpu_access; + return;drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);drm_atomic_for_each_plane_damage(&iter, &damage) { @@ -504,8 +500,6 @@ static void simpledrm_primary_plane_helper_atomic_update(struct drm_plane *plane }drm_dev_exit(idx);-out_drm_gem_fb_end_cpu_access: - drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE); }static void simpledrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c index 4b79d44752c9..022b18aa3f48 100644 --- a/drivers/gpu/drm/udl/udl_modeset.c +++ b/drivers/gpu/drm/udl/udl_modeset.c @@ -271,17 +271,13 @@ static void udl_primary_plane_helper_atomic_update(struct drm_plane *plane, struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane); struct drm_atomic_helper_damage_iter iter; struct drm_rect damage; - int ret, idx; + int idx;if (!fb)return; /* no framebuffer; plane is disabled */- ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);- if (ret) - return; - if (!drm_dev_enter(dev, &idx)) - goto out_drm_gem_fb_end_cpu_access; + return;drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);drm_atomic_for_each_plane_damage(&iter, &damage) { @@ -289,9 +285,6 @@ static void udl_primary_plane_helper_atomic_update(struct drm_plane *plane, }drm_dev_exit(idx);- -out_drm_gem_fb_end_cpu_access: - drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE); }static const struct drm_plane_helper_funcs udl_primary_plane_helper_funcs = {
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Ivo Totev
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