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drm/virtio: implement context init: track valid capabilities in a mask 

The valid capability IDs are between 1 to 63, and defined in the
virtio gpu spec.  This is used for error checking the subsequent
patches.  We're currently only using 2 capability IDs, so this
should be plenty for the immediate future.

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Acked-by: Lingfeng Yang <lfy@google.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20210921232024.817-4-gurchetansingh@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gurchetan Singh 2021-09-21 16:20:15 -07:00 committed by Gerd Hoffmann
parent b10790434c
commit 1925d6a7e0
2 changed files with 20 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/virtio/virtgpu_drv.h
View File

@ -55,6 +55,8 @@
#define STATE_OK 1
#define STATE_ERR 2
#define MAX_CAPSET_ID 63
struct virtio_gpu_object_params {
unsigned long size;
bool dumb;
@ -245,6 +247,7 @@ struct virtio_gpu_device {
struct virtio_gpu_drv_capset *capsets;
uint32_t num_capsets;
uint64_t capset_id_mask;
struct list_head cap_cache;
/* protects uuid state when exporting */

18
drivers/gpu/drm/virtio/virtgpu_kms.c
View File

@ -65,6 +65,7 @@ static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
int num_capsets)
{
int i, ret;
bool invalid_capset_id = false;
vgdev->capsets = kcalloc(num_capsets,
sizeof(struct virtio_gpu_drv_capset),
@ -78,19 +79,34 @@ static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
virtio_gpu_notify(vgdev);
ret = wait_event_timeout(vgdev->resp_wq,
vgdev->capsets[i].id > 0, 5 * HZ);
if (ret == 0) {
/*
* Capability ids are defined in the virtio-gpu spec and are
* between 1 to 63, inclusive.
*/
if (!vgdev->capsets[i].id ||
vgdev->capsets[i].id > MAX_CAPSET_ID)
invalid_capset_id = true;
if (ret == 0)
DRM_ERROR("timed out waiting for cap set %d\n", i);
else if (invalid_capset_id)
DRM_ERROR("invalid capset id %u", vgdev->capsets[i].id);
if (ret == 0 || invalid_capset_id) {
spin_lock(&vgdev->display_info_lock);
kfree(vgdev->capsets);
vgdev->capsets = NULL;
spin_unlock(&vgdev->display_info_lock);
return;
}
vgdev->capset_id_mask |= 1 << vgdev->capsets[i].id;
DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
i, vgdev->capsets[i].id,
vgdev->capsets[i].max_version,
vgdev->capsets[i].max_size);
}
vgdev->num_capsets = num_capsets;
}