| Message ID | 20200511115524.22602-2-Rodrigo.Siqueira@amd.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/vkms: Introduces writeback support | expand |
Hi Rodrigo, On Mon, 11 May 2020 at 12:55, Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> wrote: > -static uint32_t _vkms_get_crc(struct vkms_composer *primary_composer, > - struct vkms_composer *cursor_composer) > +static int compose_planes(void **vaddr_out, > + struct vkms_composer *primary_composer, > + struct vkms_composer *cursor_composer) > { > struct drm_framebuffer *fb = &primary_composer->fb; > struct drm_gem_object *gem_obj = drm_gem_fb_get_obj(fb, 0); > struct vkms_gem_object *vkms_obj = drm_gem_to_vkms_gem(gem_obj); > - void *vaddr_out = kzalloc(vkms_obj->gem.size, GFP_KERNEL); > - u32 crc = 0; > > - if (!vaddr_out) { > - DRM_ERROR("Failed to allocate memory for output frame."); > - return 0; > + if (!*vaddr_out) { > + *vaddr_out = kzalloc(vkms_obj->gem.size, GFP_KERNEL); It would be clearer if you keep the to alloc (or not for wb) in the caller. As-is it's very subtle and error prone. > + if (!*vaddr_out) { > + DRM_ERROR("Cannot allocate memory for output frame."); > + return -ENOMEM; > + } > } > > - if (WARN_ON(!vkms_obj->vaddr)) { > - kfree(vaddr_out); > - return crc; > - } > + if (WARN_ON(!vkms_obj->vaddr)) > + return -EINVAL; > > - memcpy(vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size); > + memcpy(*vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size); > > if (cursor_composer) > - compose_cursor(cursor_composer, primary_composer, vaddr_out); > + compose_cursor(cursor_composer, primary_composer, *vaddr_out); > > - crc = compute_crc(vaddr_out, primary_composer); > - > - kfree(vaddr_out); > - > - return crc; > + return 0; > } > > /** > @@ -157,9 +153,11 @@ void vkms_composer_worker(struct work_struct *work) > struct vkms_output *out = drm_crtc_to_vkms_output(crtc); > struct vkms_composer *primary_composer = NULL; > struct vkms_composer *cursor_composer = NULL; > + void *vaddr_out = NULL; > u32 crc32 = 0; > u64 frame_start, frame_end; > bool crc_pending; > + int ret; > > spin_lock_irq(&out->composer_lock); > frame_start = crtc_state->frame_start; > @@ -183,14 +181,25 @@ void vkms_composer_worker(struct work_struct *work) > if (crtc_state->num_active_planes == 2) > cursor_composer = crtc_state->active_planes[1]->composer; > > - if (primary_composer) > - crc32 = _vkms_get_crc(primary_composer, cursor_composer); > + if (!primary_composer) > + return; > + This early return changes the functionality. Namely the drm_crtc_add_crc_entry(.... 0) is now missing. I don't recall much about the crc to judge if that's a genuine bugfix, or newly introduced bug. In the former case, it should be a separate patch. > + ret = compose_planes(&vaddr_out, primary_composer, cursor_composer); > + if (ret) { > + if (ret == -EINVAL) > + kfree(vaddr_out); > + return; > + } > + > + crc32 = compute_crc(vaddr_out, primary_composer); > > /* > * The worker can fall behind the vblank hrtimer, make sure we catch up. > */ > while (frame_start <= frame_end) > drm_crtc_add_crc_entry(crtc, true, frame_start++, &crc32); > + > + kfree(vaddr_out); Nit: move the free() just after compute_crc() - it's not needed for the drm_crtc_add_crc_entry(). -Emil
diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c index 4af2f19480f4..258e659ecfba 100644 --- a/drivers/gpu/drm/vkms/vkms_composer.c +++ b/drivers/gpu/drm/vkms/vkms_composer.c @@ -108,35 +108,31 @@ static void compose_cursor(struct vkms_composer *cursor_composer, primary_composer, cursor_composer); } -static uint32_t _vkms_get_crc(struct vkms_composer *primary_composer, - struct vkms_composer *cursor_composer) +static int compose_planes(void **vaddr_out, + struct vkms_composer *primary_composer, + struct vkms_composer *cursor_composer) { struct drm_framebuffer *fb = &primary_composer->fb; struct drm_gem_object *gem_obj = drm_gem_fb_get_obj(fb, 0); struct vkms_gem_object *vkms_obj = drm_gem_to_vkms_gem(gem_obj); - void *vaddr_out = kzalloc(vkms_obj->gem.size, GFP_KERNEL); - u32 crc = 0; - if (!vaddr_out) { - DRM_ERROR("Failed to allocate memory for output frame."); - return 0; + if (!*vaddr_out) { + *vaddr_out = kzalloc(vkms_obj->gem.size, GFP_KERNEL); + if (!*vaddr_out) { + DRM_ERROR("Cannot allocate memory for output frame."); + return -ENOMEM; + } } - if (WARN_ON(!vkms_obj->vaddr)) { - kfree(vaddr_out); - return crc; - } + if (WARN_ON(!vkms_obj->vaddr)) + return -EINVAL; - memcpy(vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size); + memcpy(*vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size); if (cursor_composer) - compose_cursor(cursor_composer, primary_composer, vaddr_out); + compose_cursor(cursor_composer, primary_composer, *vaddr_out); - crc = compute_crc(vaddr_out, primary_composer); - - kfree(vaddr_out); - - return crc; + return 0; } /** @@ -157,9 +153,11 @@ void vkms_composer_worker(struct work_struct *work) struct vkms_output *out = drm_crtc_to_vkms_output(crtc); struct vkms_composer *primary_composer = NULL; struct vkms_composer *cursor_composer = NULL; + void *vaddr_out = NULL; u32 crc32 = 0; u64 frame_start, frame_end; bool crc_pending; + int ret; spin_lock_irq(&out->composer_lock); frame_start = crtc_state->frame_start; @@ -183,14 +181,25 @@ void vkms_composer_worker(struct work_struct *work) if (crtc_state->num_active_planes == 2) cursor_composer = crtc_state->active_planes[1]->composer; - if (primary_composer) - crc32 = _vkms_get_crc(primary_composer, cursor_composer); + if (!primary_composer) + return; + + ret = compose_planes(&vaddr_out, primary_composer, cursor_composer); + if (ret) { + if (ret == -EINVAL) + kfree(vaddr_out); + return; + } + + crc32 = compute_crc(vaddr_out, primary_composer); /* * The worker can fall behind the vblank hrtimer, make sure we catch up. */ while (frame_start <= frame_end) drm_crtc_add_crc_entry(crtc, true, frame_start++, &crc32); + + kfree(vaddr_out); } static const char * const pipe_crc_sources[] = {"auto"};