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path: root/drivers/gpu/drm/virtio/virtgpu_vq.c
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2020-11-06drm/virtio: Fix a double free in virtio_gpu_cmd_map()Dan Carpenter1-3/+1
This is freed both here and in the caller (virtio_gpu_vram_map()) so it's a double free. The correct place is only in the caller. Fixes: 16845c5d5409 ("drm/virtio: implement blob resources: implement vram object") Signed-off-by: Dan Carpenter <[email protected]> Reviewed-by: Gurchetan Singh <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/20201030114808.GD3251003@mwanda Signed-off-by: Gerd Hoffmann <[email protected]>
2020-11-02Merge drm/drm-next into drm-misc-nextMaxime Ripard1-8/+5
Daniel needs -rc2 in drm-misc-next to merge some patches Signed-off-by: Maxime Ripard <[email protected]>
2020-10-14drm/virtio: Use UUID API for importing the UUIDAndy Shevchenko1-1/+1
There is import_uuid() function which imports u8 array to the uuid_t. Use it instead of open coding variant. This allows to hide the uuid_t internals. Reviewed-by: David Stevens <[email protected]> Signed-off-by: Andy Shevchenko <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-09-29drm/virtio: implement blob resources: fix stride discrepancyGurchetan Singh1-2/+12
The old transfer ioctls may work on blob resources, and there is no TRANSFER_BLOB hypercall now for simplicity. The guest may have a image view on the blob resources such that the stride is not equal to width * bytes_per_pixel. For host-only blobs, we can repurpose the transfer ioctls to synchronize caches as well. For guest-only blobs, these operations are undefined for now so leave them out. Also, with seamless Wayland integration between guest/host looking increasingly attractive, it also makes sense to keep track of one value for stride. Signed-off-by: Gurchetan Singh <[email protected]> Acked-by: Tomeu Vizoso <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-09-29drm/virtio: implement blob resources: hypercall interfaceGurchetan Singh1-0/+65
This implements the blob hypercall interface. Signed-off-by: Gurchetan Singh <[email protected]> Acked-by: Tomeu Vizoso <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-09-29drm/virtio: implement blob resources: implement vram objectGerd Hoffmann1-0/+66
A virtio-gpu vram object is based on range-based allocation. No guest shmemfs backing, so we call drm_gem_private_object_init. This is for host memory without any guest backing (atleast initially). Signed-off-by: Gerd Hoffmann <[email protected]> Acked-by: Tomeu Vizoso <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Co-developed-by: Gurchetan Singh <[email protected]> Signed-off-by: Gurchetan Singh <[email protected]>
2020-09-29drm/virtio: blob prep: make CPU responses more genericGurchetan Singh1-5/+5
RESOURCE_MAP_BLOB / RESOURCE_UNMAP_BLOB can use this. Signed-off-by: Gurchetan Singh <[email protected]> Acked-by: Tomeu Vizoso <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-09-23Merge tag 'drm-misc-next-2020-09-21' of ↵Dave Airlie1-22/+31
git://anongit.freedesktop.org/drm/drm-misc into drm-next drm-misc-next for 5.10: UAPI Changes: Cross-subsystem Changes: - virtio: Merged a PR for patches that will affect drm/virtio Core Changes: - dev: More devm_drm convertions and removal of drm_dev_init - atomic: Split out drm_atomic_helper_calc_timestamping_constants of drm_atomic_helper_update_legacy_modeset_state - ttm: More rework Driver Changes: - i915: selftests improvements - panfrost: support for Amlogic SoC - vc4: one fix - tree-wide: conversions to devm_drm_dev_alloc, - ast: simplifications of the atomic modesetting code - panfrost: multiple fixes - vc4: multiple fixes Signed-off-by: Dave Airlie <[email protected]> From: Maxime Ripard <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-09-17Merge branch 'for-5.10-drm-sg-fix' of https://github.com/mszyprow/linux into ↵Dave Airlie1-7/+5
drm-next Please pull a set of fixes for various DRM drivers that finally resolve incorrect usage of the scatterlists (struct sg_table nents and orig_nents entries), what causes issues when IOMMU is used. Signed-off-by: Dave Airlie <[email protected]> From: Marek Szyprowski <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-09-15drm/virtio: add virtio_gpu_cmd_unref_resource error handlingGerd Hoffmann1-1/+4
Usually we wait for the host to complete the unref request, then cleanup the guest-side state of the object in the completion callback. When submitting the unref command failed the completion callback will not be called though, so cleanup right away. Fixes a WARN on stale mm entries on driver shutdown. Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Gurchetan Singh <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-09-15drm/virtio: return virtio_gpu_queue errorsGerd Hoffmann1-18/+20
In case queuing virtio commands fails (can happen when the device got unplugged) pass up the error. Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Gurchetan Singh <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-09-10drm: virtio: fix common struct sg_table related issuesMarek Szyprowski1-7/+5
The Documentation/DMA-API-HOWTO.txt states that the dma_map_sg() function returns the number of the created entries in the DMA address space. However the subsequent calls to the dma_sync_sg_for_{device,cpu}() and dma_unmap_sg must be called with the original number of the entries passed to the dma_map_sg(). struct sg_table is a common structure used for describing a non-contiguous memory buffer, used commonly in the DRM and graphics subsystems. It consists of a scatterlist with memory pages and DMA addresses (sgl entry), as well as the number of scatterlist entries: CPU pages (orig_nents entry) and DMA mapped pages (nents entry). It turned out that it was a common mistake to misuse nents and orig_nents entries, calling DMA-mapping functions with a wrong number of entries or ignoring the number of mapped entries returned by the dma_map_sg() function. To avoid such issues, lets use a common dma-mapping wrappers operating directly on the struct sg_table objects and use scatterlist page iterators where possible. This, almost always, hides references to the nents and orig_nents entries, making the code robust, easier to follow and copy/paste safe. Signed-off-by: Marek Szyprowski <[email protected]> Acked-by: Gerd Hoffmann <[email protected]>
2020-09-09Fix use after free in get_capset_info callback.Doug Horn1-3/+7
If a response to virtio_gpu_cmd_get_capset_info takes longer than five seconds to return, the callback will access freed kernel memory in vg->capsets. Signed-off-by: Doug Horn <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-08-18Merge v5.9-rc1 into drm-misc-nextMaxime Ripard1-2/+2
Sam needs 5.9-rc1 to have dev_err_probe in to merge some patches. Signed-off-by: Maxime Ripard <[email protected]>
2020-08-18drm/virtio: Support virtgpu exported resourcesDavid Stevens1-0/+55
Add support for UUID-based resource sharing mechanism to virtgpu. This implements the new virtgpu commands and hooks them up to dma-buf's get_uuid callback. Signed-off-by: David Stevens <[email protected]> Acked-by: Michael S. Tsirkin <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-08-03virtio: virtio_has_iommu_quirk -> virtio_has_dma_quirkMichael S. Tsirkin1-2/+2
Now that the corresponding feature bit has been renamed, rename the quirk too - it's about special ways to do DMA, not necessarily about the IOMMU. Signed-off-by: Michael S. Tsirkin <[email protected]>
2020-04-03drm/virtio: make virtio_gpu_object_attach voidGurchetan Singh1-5/+4
It always returns zero. Signed-off-by: Gurchetan Singh <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-03-09drm/virtio: factor out the sg_table from virtio_gpu_objectGurchetan Singh1-2/+4
A resource will be a shmem based resource or a (planned) vram based resource, so it makes sense to factor out common fields (resource handle, dumb). v2: move mapped field to shmem object Signed-off-by: Gurchetan Singh <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-02-17drm/virtio: move remaining virtio_gpu_notify callsGerd Hoffmann1-9/+0
Move all remaining virtio_gpu_notify() calls from virtio_gpu_cmd_* to the callers, for consistency reasons. Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Reviewed-by: Gurchetan Singh <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-02-17drm/virtio: batch display queryGerd Hoffmann1-2/+0
Move virtio_gpu_notify() to higher-level functions for virtio_gpu_cmd_get_display_info() and virtio_gpu_cmd_get_edids(). virtio_gpu_config_changed_work_func() and virtio_gpu_init() will batch commands and notify only once per update Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Reviewed-by: Gurchetan Singh <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-02-17drm/virtio: batch resource creationGerd Hoffmann1-3/+0
Move virtio_gpu_notify() to higher-level functions for virtio_gpu_cmd_create_resource(), virtio_gpu_cmd_resource_create_3d() and virtio_gpu_cmd_resource_attach_backing(). virtio_gpu_object_create() will batch commands and notify only once when creating a resource. Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Reviewed-by: Gurchetan Singh <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-02-17drm/virtio: batch plane updates (pageflip)Gerd Hoffmann1-4/+0
Move virtio_gpu_notify() to higher-level functions for virtio_gpu_cmd_resource_flush(), virtio_gpu_cmd_set_scanout() and virtio_gpu_cmd_transfer_to_host_{2d,3d}(). virtio_gpu_primary_plane_update() will notify only once for a series of commands (restores plane update command batching). Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Reviewed-by: Gurchetan Singh <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-02-17drm/virtio: notify before waitingGerd Hoffmann1-0/+1
Before we are going to wait for virtqueue entries becoming available call virtio_gpu_notify() to make sure the host has seen everything we've submitted. Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Reviewed-by: Gurchetan Singh <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-02-17drm/virtio: rework notification for better batchingGerd Hoffmann1-19/+31
Drop the virtio_gpu_{disable,enable}_notify(). Add a new virtio_gpu_notify() call instead, which must be called whenever the driver wants make sure the host is notified needed. Drop automatic notification from command submission. Add virtio_gpu_notify() calls after each command query instead. This allows more fine-grained control over host notification and can move around the notify calls in subsequent patches to batch command submissions. With this in place it is also possible to make notification optional for userspace ioctls. Page flip batching goes away (temporarely). v3: - move batching to separate patches. v2: - rebase to latest drm-misc-next. - use "if (!atomic_read())". - add review & test tags. Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Gurchetan Singh <[email protected]> Tested-by: Gurchetan Singh <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-02-14drm/virtio: fix error checkGerd Hoffmann1-1/+1
The >= compare op must happen in cpu byte order, doing it in little endian fails on big endian machines like s390. Reported-by: Sebastian Mitterle <[email protected]> Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Cornelia Huck <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-02-12drm/virtio: add drm_driver.release callback.Gerd Hoffmann1-12/+15
Split virtio_gpu_deinit(), move the drm shutdown and release to virtio_gpu_release(). Drop vqs_ready variable, instead use drm_dev_{enter,exit,unplug} to avoid touching hardware after device removal. Tidy up here and there. v4: add changelog. v3: use drm_dev_*(). Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Daniel Vetter <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-02-10drm/virtio: move virtio_gpu_mem_entry initialization to new functionGerd Hoffmann1-48/+3
Introduce new virtio_gpu_object_shmem_init() helper function which will create the virtio_gpu_mem_entry array, containing the backing storage information for the host. For the most path this just moves code from virtio_gpu_object_attach(). Signed-off-by: Gerd Hoffmann <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Reviewed-by: Chia-I Wu <[email protected]>
2020-02-10drm/virtio: move mapping teardown to virtio_gpu_cleanup_object()Gerd Hoffmann1-46/+0
Stop sending DETACH_BACKING commands, that will happening anyway when releasing resources via UNREF. Handle guest-side cleanup in virtio_gpu_cleanup_object(), called when the host finished processing the UNREF command. Signed-off-by: Gerd Hoffmann <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Reviewed-by: Chia-I Wu <[email protected]>
2020-02-10drm/virtio: resource teardown tweaksGerd Hoffmann1-3/+26
Add new virtio_gpu_cleanup_object() helper function for object cleanup. Wire up callback function for resource unref, do cleanup from callback when we know the host stopped using the resource. Signed-off-by: Gerd Hoffmann <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Reviewed-by: Chia-I Wu <[email protected]>
2020-02-10drm/virtio: simplify virtio_gpu_alloc_cmdGerd Hoffmann1-17/+9
Just call virtio_gpu_alloc_cmd_resp with some fixed args instead of duplicating most of the function body. Signed-off-by: Gerd Hoffmann <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Reviewed-by: Chia-I Wu <[email protected]>
2020-02-07drm/virtio: fix ring free checkGerd Hoffmann1-0/+3
If the virtio device supports indirect ring descriptors we need only one ring entry for the whole command. Take that into account when checking whenever the virtqueue has enough free entries for our command. Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2020-02-06drm/virtio: move virtqueue_notify into virtio_gpu_queue_ctrl_sgsChia-I Wu1-12/+10
It becomes clear that virtio_gpu_queue_fenced_ctrl_buffer should be responsible for setting up sgs and virtio_gpu_queue_ctrl_sgs should be responsible for queuing sgs. Signed-off-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-02-06drm/virtio: move the check for vqs_ready earlierChia-I Wu1-5/+8
When vqs_ready is false, vq should be considered invalid and we should not check vq->num_free. After this change, a fenced command queued before the vqs are ready will have fence id 0 and will be considered done. Signed-off-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-02-06drm/virtio: move locking into virtio_gpu_queue_ctrl_sgsChia-I Wu1-35/+35
Signed-off-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-02-06drm/virtio: set up virtqueue sgs before lockingChia-I Wu1-31/+35
sgs setup does not need to be in the critical section. Signed-off-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-02-06drm/virtio: unlock object array on errorsChia-I Wu1-1/+4
We don't propagate erros to the callers. We have to unlock object arrays on errors. Signed-off-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-02-06drm/virtio: no need to pass virtio_gpu_ctrl_hdrChia-I Wu1-12/+12
We can get it from vbuf. Signed-off-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-02-06drm/virtio: add virtio_gpu_vbuf_ctrl_hdrChia-I Wu1-5/+15
It is a helper to return the virtio_gpu_ctrl_hdr in a vbuf. Signed-off-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-02-06drm/virtio: remove incorrect ENOSPC checkChia-I Wu1-13/+6
The handling of virtqueue_add_sgs ENOSPC error is incorrect because it can result in out-of-order virtqueue_add_sgs and break fences. We never get ENOSPC anyway because the caller waits until there is enough space (the other caller that did not wait was removed in commit 32d6c2c5b522 ("drm/virtio: Rewrite virtio_gpu_queue_ctrl_buffer using fenced version.")). Remove the incorrect and unnecessary error path. This also adds a WARN_ON(ret) until we properly handle errors. Signed-off-by: Chia-I Wu <[email protected]> Cc: David Riley <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-02-06drm/virtio: fix a wait_event conditionChia-I Wu1-1/+2
outcnt may be greater than 1 since commit e1218b8c0cc1 ("drm/virtio: Use vmalloc for command buffer allocations."). Fixes: e1218b8c0cc1 ("drm/virtio: Use vmalloc for command buffer allocations.") Signed-off-by: Chia-I Wu <[email protected]> Cc: David Riley <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2020-02-06drm/virtio: ratelimit error loggingGerd Hoffmann1-3/+3
Avoid flooding the log in case we screw up badly. Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2019-12-16drm/virtio: batch display update commands.Gerd Hoffmann1-2/+21
When the driver submits multiple commands in a row it makes sense to notify the host only after submitting the last one, so the host can process them all at once, with a single vmexit. Add functions to enable/disable notifications to allow that. Use the new functions for primary plane updates. Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2019-11-20drm/virtio: fix byteorder handling in virtio_gpu_cmd_transfer_{from, ↵Gerd Hoffmann1-4/+15
to}_host_3d functions Be consistent with the rest of the code base. No functional change. v2: - fix sparse warnings for virtio_gpu_cmd_transfer_to_host_2d call. - move convert_to_hw_box helper function. Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Gurchetan Singh <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2019-10-22drm/virtio: move byteorder handling into virtio_gpu_cmd_transfer_to_host_2d ↵Gerd Hoffmann1-6/+6
function Be consistent with the rest of the code base. Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Daniel Vetter <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2019-09-13drm/virtio: Fix warning in virtio_gpu_queue_fenced_ctrl_buffer.David Riley1-1/+1
Fix warning introduced with commit e1218b8c0cc1 ("drm/virtio: Use vmalloc for command buffer allocations.") from drm-misc-next. Signed-off-by: David Riley <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2019-09-12drm/virtio: Use vmalloc for command buffer allocations.David Riley1-8/+70
Userspace requested command buffer allocations could be too large to make as a contiguous allocation. Use vmalloc if necessary to satisfy those allocations. Signed-off-by: David Riley <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2019-09-12drm/virtio: Rewrite virtio_gpu_queue_ctrl_buffer using fenced version.David Riley1-13/+7
Factor function in preparation to generating scatterlist prior to locking. Signed-off-by: David Riley <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
2019-09-06drm/virtio: fix command submission with objects but without fence.Gerd Hoffmann1-4/+5
Only call virtio_gpu_array_add_fence if we actually have a fence. Fixes: da758d51968a ("drm/virtio: rework virtio_gpu_execbuffer_ioctl fencing") Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2019-09-04drm/virtio: add worker for object releaseGerd Hoffmann1-1/+1
Move object release into a separate worker. Releasing objects requires sending commands to the host. Doing that in the dequeue worker will cause deadlocks in case the command queue gets filled up, because the dequeue worker is also the one which will free up slots in the command queue. Reported-by: Chia-I Wu <[email protected]> Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Tested-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
2019-09-04drm/virtio: switch from ttm to gem shmem helpersGerd Hoffmann1-6/+18
virtio-gpu basically needs a sg_table for the bo, to tell the host where the backing pages for the object are. So the gem shmem helpers are a perfect fit. Some drm_gem_object_funcs need thin wrappers to update the host state, but otherwise the helpers handle everything just fine. Once the fencing was sorted the switch was surprisingly easy and for the most part just removing the ttm code. v4: fix drm_gem_object_funcs name. Signed-off-by: Gerd Hoffmann <[email protected]> Acked-by: Daniel Vetter <[email protected]> Reviewed-by: Chia-I Wu <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
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