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Mon, 11 Jan 2021 08:58:15 -0800 (PST) Date: Mon, 11 Jan 2021 17:58:13 +0100 From: Daniel Vetter To: Thomas Zimmermann Subject: Re: [PATCH v4 05/13] drm/mgag200: Use drm_gem_shmem_vmap_local() in damage handling Message-ID: References: <20210108094340.15290-1-tzimmermann@suse.de> <20210108094340.15290-6-tzimmermann@suse.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Operating-System: Linux phenom 5.7.0-1-amd64 Cc: eric@anholt.net, sam@ravnborg.org, dri-devel@lists.freedesktop.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, christian.koenig@amd.com, linaro-mm-sig@lists.linaro.org, hdegoede@redhat.com, daniel@ffwll.ch, airlied@redhat.com, virtualization@lists.linux-foundation.org, sean@poorly.run, sumit.semwal@linaro.org, linux-media@vger.kernel.org X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" On Mon, Jan 11, 2021 at 05:53:41PM +0100, Daniel Vetter wrote: > On Fri, Jan 08, 2021 at 10:43:32AM +0100, Thomas Zimmermann wrote: > > Damage handling in mgag200 requires a short-term mapping of the source > > BO. Use drm_gem_shmem_vmap_local(). > > > > Signed-off-by: Thomas Zimmermann > > Reviewed-by: Daniel Vetter On second thought, strike that r-b, I have a confused question. > > > --- > > drivers/gpu/drm/mgag200/mgag200_mode.c | 16 +++++++++++++--- > > 1 file changed, 13 insertions(+), 3 deletions(-) > > > > diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c > > index 1dfc42170059..a33e28d4c5e9 100644 > > --- a/drivers/gpu/drm/mgag200/mgag200_mode.c > > +++ b/drivers/gpu/drm/mgag200/mgag200_mode.c > > @@ -1552,22 +1552,32 @@ mgag200_handle_damage(struct mga_device *mdev, struct drm_framebuffer *fb, > > struct drm_rect *clip) > > { > > struct drm_device *dev = &mdev->base; > > + struct drm_gem_object *obj = fb->obj[0]; > > struct dma_buf_map map; > > void *vmap; > > int ret; > > > > - ret = drm_gem_shmem_vmap(fb->obj[0], &map); > > + ret = dma_resv_lock(obj->resv, NULL); > > if (drm_WARN_ON(dev, ret)) > > - return; /* BUG: SHMEM BO should always be vmapped */ > > + return; > > + ret = drm_gem_shmem_vmap_local(obj, &map); > > + if (drm_WARN_ON(dev, ret)) > > + goto err_dma_resv_unlock; /* BUG: SHMEM BO should always be vmapped */ Why is this guaranteed? I tried to hunt for a vmap in mga200g code, and dind't find any. I'd ahve expected something in prepare/finish_fb. Also since this is not a vram-helper using driver, why convert it over to vmap_local? I guess that should also be explained in the commit message a bit better. -Daniel > > vmap = map.vaddr; /* TODO: Use mapping abstraction properly */ > > > > drm_fb_memcpy_dstclip(mdev->vram, vmap, fb, clip); > > > > - drm_gem_shmem_vunmap(fb->obj[0], &map); > > + drm_gem_shmem_vunmap_local(obj, &map); > > + dma_resv_unlock(obj->resv); > > > > /* Always scanout image at VRAM offset 0 */ > > mgag200_set_startadd(mdev, (u32)0); > > mgag200_set_offset(mdev, fb); > > + > > + return; > > + > > +err_dma_resv_unlock: > > + dma_resv_unlock(obj->resv); > > } > > > > static void > > -- > > 2.29.2 > > > > -- > Daniel Vetter > Software Engineer, Intel Corporation > http://blog.ffwll.ch -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization