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SubjectRe: [PATCH] Revert "drm/qxl: drop prime import/export callbacks"
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On 4/26/19 4:21 PM, Daniel Vetter wrote:
> On Fri, Apr 26, 2019 at 7:33 AM Gerd Hoffmann <kraxel@redhat.com> wrote:
>> This reverts commit f4c34b1e2a37d5676180901fa6ff188bcb6371f8.
>>
>> Simliar to commit a0cecc23cfcb Revert "drm/virtio: drop prime
>> import/export callbacks". We have to do the same with qxl,
>> for the same reasons (it breaks DRI3).
>>
>> Drop the WARN_ON_ONCE().
>>
>> Fixes: f4c34b1e2a37d5676180901fa6ff188bcb6371f8
>> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> Maybe we need some helpers for virtual drivers which only allow
> self-reimport and nothing else at all? I think there's qxl, virgl,
> vmwgfx and maybe also vbox one who could use this ... Just a quick
> idea.
> -Daniel

I think vmwgfx could, in theory, support the full range of operations,
at least for reasonably recent device versions. However, it wouldn't be
terribly efficient since the exported dma-buf sglist would basically be
a bounce-buffer.

/Thomas


>> ---
>> drivers/gpu/drm/qxl/qxl_drv.c | 4 ++++
>> drivers/gpu/drm/qxl/qxl_prime.c | 12 ++++++++++++
>> 2 files changed, 16 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b/drivers/gpu/drm/qxl/qxl_drv.c
>> index 578d867a81d5..f33e349c4ec5 100644
>> --- a/drivers/gpu/drm/qxl/qxl_drv.c
>> +++ b/drivers/gpu/drm/qxl/qxl_drv.c
>> @@ -255,10 +255,14 @@ static struct drm_driver qxl_driver = {
>> #if defined(CONFIG_DEBUG_FS)
>> .debugfs_init = qxl_debugfs_init,
>> #endif
>> + .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
>> + .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
>> .gem_prime_export = drm_gem_prime_export,
>> .gem_prime_import = drm_gem_prime_import,
>> .gem_prime_pin = qxl_gem_prime_pin,
>> .gem_prime_unpin = qxl_gem_prime_unpin,
>> + .gem_prime_get_sg_table = qxl_gem_prime_get_sg_table,
>> + .gem_prime_import_sg_table = qxl_gem_prime_import_sg_table,
>> .gem_prime_vmap = qxl_gem_prime_vmap,
>> .gem_prime_vunmap = qxl_gem_prime_vunmap,
>> .gem_prime_mmap = qxl_gem_prime_mmap,
>> diff --git a/drivers/gpu/drm/qxl/qxl_prime.c b/drivers/gpu/drm/qxl/qxl_prime.c
>> index 8b448eca1cd9..114653b471c6 100644
>> --- a/drivers/gpu/drm/qxl/qxl_prime.c
>> +++ b/drivers/gpu/drm/qxl/qxl_prime.c
>> @@ -42,6 +42,18 @@ void qxl_gem_prime_unpin(struct drm_gem_object *obj)
>> qxl_bo_unpin(bo);
>> }
>>
>> +struct sg_table *qxl_gem_prime_get_sg_table(struct drm_gem_object *obj)
>> +{
>> + return ERR_PTR(-ENOSYS);
>> +}
>> +
>> +struct drm_gem_object *qxl_gem_prime_import_sg_table(
>> + struct drm_device *dev, struct dma_buf_attachment *attach,
>> + struct sg_table *table)
>> +{
>> + return ERR_PTR(-ENOSYS);
>> +}
>> +
>> void *qxl_gem_prime_vmap(struct drm_gem_object *obj)
>> {
>> struct qxl_bo *bo = gem_to_qxl_bo(obj);
>> --
>> 2.18.1
>>
>

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