[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240129103118.3258781-1-julia.zhang@amd.com>
Date: Mon, 29 Jan 2024 18:31:19 +0800
From: Julia Zhang <julia.zhang@....com>
To: Gurchetan Singh <gurchetansingh@...omium.org>, Chia-I Wu
<olvaffe@...il.com>, David Airlie <airlied@...hat.com>, Gerd Hoffmann
<kraxel@...hat.com>, <linux-kernel@...r.kernel.org>,
<dri-devel@...ts.freedesktop.org>, <amd-gfx@...ts.freedesktop.org>,
<virtualization@...ts.linux-foundation.org>
CC: Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>, Daniel Vetter
<daniel@...ll.ch>, David Airlie <airlied@...il.com>, Erik Faye-Lund
<kusmabite@...il.com>, Marek Olšák
<marek.olsak@....com>, Pierre-Eric Pelloux-Prayer
<pierre-eric.pelloux-prayer@....com>, Honglei Huang <honglei1.huang@....com>,
Chen Jiqian <Jiqian.Chen@....com>, Huang Rui <ray.huang@....com>, Julia Zhang
<julia.zhang@....com>
Subject: [PATCH v2 1/1] drm/virtio: Implement device_attach
As vram objects don't have backing pages and thus can't implement
drm_gem_object_funcs.get_sg_table callback. This removes drm dma-buf
callbacks in virtgpu_gem_map_dma_buf()/virtgpu_gem_unmap_dma_buf()
and implement virtgpu specific map/unmap/attach callbacks to support
both of shmem objects and vram objects.
Signed-off-by: Julia Zhang <julia.zhang@....com>
---
drivers/gpu/drm/virtio/virtgpu_prime.c | 40 +++++++++++++++++++++++---
1 file changed, 36 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c
index 44425f20d91a..b490a5343b06 100644
--- a/drivers/gpu/drm/virtio/virtgpu_prime.c
+++ b/drivers/gpu/drm/virtio/virtgpu_prime.c
@@ -49,11 +49,26 @@ virtgpu_gem_map_dma_buf(struct dma_buf_attachment *attach,
{
struct drm_gem_object *obj = attach->dmabuf->priv;
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+ struct sg_table *sgt;
+ int ret;
if (virtio_gpu_is_vram(bo))
return virtio_gpu_vram_map_dma_buf(bo, attach->dev, dir);
- return drm_gem_map_dma_buf(attach, dir);
+ sgt = drm_prime_pages_to_sg(obj->dev,
+ to_drm_gem_shmem_obj(obj)->pages,
+ obj->size >> PAGE_SHIFT);
+ if (IS_ERR(sgt))
+ return sgt;
+
+ ret = dma_map_sgtable(attach->dev, sgt, dir, DMA_ATTR_SKIP_CPU_SYNC);
+ if (ret) {
+ sg_free_table(sgt);
+ kfree(sgt);
+ return ERR_PTR(ret);
+ }
+
+ return sgt;
}
static void virtgpu_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
@@ -63,12 +78,29 @@ static void virtgpu_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
struct drm_gem_object *obj = attach->dmabuf->priv;
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+ if (!sgt)
+ return;
+
if (virtio_gpu_is_vram(bo)) {
virtio_gpu_vram_unmap_dma_buf(attach->dev, sgt, dir);
- return;
+ } else {
+ dma_unmap_sgtable(attach->dev, sgt, dir, DMA_ATTR_SKIP_CPU_SYNC);
+ sg_free_table(sgt);
+ kfree(sgt);
}
+}
+
+static int virtgpu_gem_device_attach(struct dma_buf *dma_buf,
+ struct dma_buf_attachment *attach)
+{
+ struct drm_gem_object *obj = attach->dmabuf->priv;
+ struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+ int ret = 0;
+
+ if (!virtio_gpu_is_vram(bo) && obj->funcs->pin)
+ ret = obj->funcs->pin(obj);
- drm_gem_unmap_dma_buf(attach, sgt, dir);
+ return ret;
}
static const struct virtio_dma_buf_ops virtgpu_dmabuf_ops = {
@@ -83,7 +115,7 @@ static const struct virtio_dma_buf_ops virtgpu_dmabuf_ops = {
.vmap = drm_gem_dmabuf_vmap,
.vunmap = drm_gem_dmabuf_vunmap,
},
- .device_attach = drm_gem_map_attach,
+ .device_attach = virtgpu_gem_device_attach,
.get_uuid = virtgpu_virtio_get_uuid,
};
--
2.34.1
Powered by blists - more mailing lists