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virtio-gpu: Add udmabuf helpers

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Add helper functions to create a dmabuf for a resource and mmap it.
Also, introduce the fields blob and blob_size so that these helpers
can start to use them but the full picture will emerge only after
adding create_blob API in patch 8 of this series.

To be able to create a dmabuf using the udmabuf driver, Qemu needs
to be lauched with the memfd memory backend like this:

qemu-system-x86_64 -m 8192m -object memory-backend-memfd,id=mem1,size=8192M
-machine memory-backend=mem1

Based-on-patch-by: Gerd Hoffmann <kraxel@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Message-Id: <20210526231429.1045476-4-vivek.kasireddy@intel.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Vivek Kasireddy 2021-05-26 16:14:18 -07:00 • committed by Gerd Hoffmann
parent 4d01086161
commit 9b60cdf987
3 changed files with 170 additions and 0 deletions
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11
include/hw/virtio/virtio-gpu.h
View file

@ -50,6 +50,12 @@ struct virtio_gpu_simple_resource {
uint32_t scanout_bitmask;
pixman_image_t *image;
uint64_t hostmem;
uint64_t blob_size;
void *blob;
int dmabuf_fd;
uint8_t *remapped;
QTAILQ_ENTRY(virtio_gpu_simple_resource) next;
};
@ -238,6 +244,11 @@ void virtio_gpu_update_cursor_data(VirtIOGPU *g,
struct virtio_gpu_scanout *s,
uint32_t resource_id);
/* virtio-gpu-udmabuf.c */
bool virtio_gpu_have_udmabuf(void);
void virtio_gpu_init_udmabuf(struct virtio_gpu_simple_resource *res);
void virtio_gpu_fini_udmabuf(struct virtio_gpu_simple_resource *res);
/* virtio-gpu-3d.c */
void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
struct virtio_gpu_ctrl_command *cmd);