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drm/virtio: Add a helper to map and note the dma addrs and lengths

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This helper would be used when first initializing the object as
part of import and also when updating the plane where we need to
ensure that the imported object's backing is valid.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Gurchetan Singh <gurchetansingh@chromium.org>
Cc: Chia-I Wu <olvaffe@gmail.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Reviewed-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241126031643.3490496-3-vivek.kasireddy@intel.com
This commit is contained in:
Vivek Kasireddy
2024-11-25 19:13:43 -08:00
committed by Dmitry Osipenko
parent 06a0f77195
commit 25c3fd1183
2 changed files with 47 additions and 0 deletions
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42
drivers/gpu/drm/virtio/virtgpu_prime.c
View File

@@ -27,6 +27,8 @@
#include "virtgpu_drv.h"
MODULE_IMPORT_NS(DMA_BUF);
static int virtgpu_virtio_get_uuid(struct dma_buf *buf,
uuid_t *uuid)
{
@@ -142,6 +144,46 @@ struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
return buf;
}
int virtgpu_dma_buf_import_sgt(struct virtio_gpu_mem_entry **ents,
unsigned int *nents,
struct virtio_gpu_object *bo,
struct dma_buf_attachment *attach)
{
struct scatterlist *sl;
struct sg_table *sgt;
long i, ret;
dma_resv_assert_held(attach->dmabuf->resv);
ret = dma_resv_wait_timeout(attach->dmabuf->resv,
DMA_RESV_USAGE_KERNEL,
false, MAX_SCHEDULE_TIMEOUT);
if (ret <= 0)
return ret < 0 ? ret : -ETIMEDOUT;
sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
if (IS_ERR(sgt))
return PTR_ERR(sgt);
*ents = kvmalloc_array(sgt->nents,
sizeof(struct virtio_gpu_mem_entry),
GFP_KERNEL);
if (!(*ents)) {
dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
return -ENOMEM;
}
*nents = sgt->nents;
for_each_sgtable_dma_sg(sgt, sl, i) {
(*ents)[i].addr = cpu_to_le64(sg_dma_address(sl));
(*ents)[i].length = cpu_to_le32(sg_dma_len(sl));
(*ents)[i].padding = 0;
}
bo->sgt = sgt;
return 0;
}
struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
struct dma_buf *buf)
{