On 11/05/2016 01:06 PM, Christian König wrote: > Am 05.11.2016 um 01:56 schrieb Mario Kleiner: >> External clients which import our bo's wait only >> for exclusive dmabuf-fences, not on shared ones, >> so attach fences on such exported buffers as >> exclusive ones. >> >> See discussion in thread: >> https://lists.freedesktop.org/archives/dri-devel/2016-October/122370.html >> >> Tested on Intel iGPU + AMD Tonga dGPU as DRI3/Present >> Prime render offload, and with the Tonga standalone as >> primary gpu. >> >> v2: Add a wait for all shared fences before prime export, >> as suggested by Christian Koenig. >> >> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95472 >> (v1) Tested-by: Mike Lothian <mike at fireburn.co.uk> >> Signed-off-by: Mario Kleiner <mario.kleiner.de at gmail.com> >> Cc: Christian König <christian.koenig at amd.com> >> Cc: Michel Dänzer <michel.daenzer at amd.com> >> --- >> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 + >> drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c | 2 +- >> drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c | 11 +++++++++++ >> 3 files changed, 13 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h >> b/drivers/gpu/drm/amd/amdgpu/amdgpu.h >> index 039b57e..a337d56 100644 >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h >> @@ -459,6 +459,7 @@ struct amdgpu_bo { >> u64 metadata_flags; >> void *metadata; >> u32 metadata_size; >> + bool prime_exported; >> /* list of all virtual address to which this bo >> * is associated to >> */ >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c >> b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c >> index 651115d..51c6f60 100644 >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c >> @@ -132,7 +132,7 @@ static int amdgpu_bo_list_set(struct amdgpu_device >> *adev, >> entry->priority = min(info[i].bo_priority, >> AMDGPU_BO_LIST_MAX_PRIORITY); >> entry->tv.bo = &entry->robj->tbo; >> - entry->tv.shared = true; >> + entry->tv.shared = !entry->robj->prime_exported; >> if (entry->robj->prefered_domains == AMDGPU_GEM_DOMAIN_GDS) >> gds_obj = entry->robj; >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c >> b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c >> index 7700dc2..0ed92a1 100644 >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c >> @@ -117,9 +117,20 @@ struct dma_buf *amdgpu_gem_prime_export(struct >> drm_device *dev, >> int flags) >> { >> struct amdgpu_bo *bo = gem_to_amdgpu_bo(gobj); >> + long ret; >> if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm)) >> return ERR_PTR(-EPERM); >> + /* >> + * Wait for all shared fences to complete before we switch to future >> + * use of exclusive fence on this prime_exported bo. >> + */ >> + ret = reservation_object_wait_timeout_rcu(bo->tbo.resv, true, false, >> + MAX_SCHEDULE_TIMEOUT); >> + WARN(ret <= 0, "Fence wait returns %li\n", ret); >> + >> + bo->prime_exported = true; >> + > > As Michel noted as well this is the wrong function for this, cause this > is used for buffer sharing without DMA-buf as well. Try to put it into > amdgpu_gem_prime_pin() instead. > > I would also improve the error handling so that we return the error when > the wait failed. > Ok. I'll place the code before the actual pinning code in that function then, so it can error out early if needed. -mario > Apart from that this looks really good to me. > > Regards, > Christian. > >> return drm_gem_prime_export(dev, gobj, flags); >> } > >
