From: shaoyunl Date: Thu, 25 Oct 2018 19:40:51 +0000 (-0400) Subject: drm/amdgpu: Use heavy weight for tlb invalidation on xgmi configuration X-Git-Tag: v5.3-rc1~81^2~25^2~44 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=e14ba95b908f049dc98915e3452705dec5e506c6;p=linux.git drm/amdgpu: Use heavy weight for tlb invalidation on xgmi configuration There is a bug found in vml2 xgmi logic: mtype is always sent as NC on the VMC to TC interface for a page walk, regardless of whether the request is being sent to local or remote GPU. NC means non-coherent and will cause the VMC return data to be cached in the TCC (versus UC – uncached will not cache the data). Since the page table updates are being done by SDMA/HDP, then TCC will never be updated and the GC VML2 will continue to hit on the TCC and never get the updated page tables and result in a fault. Heave weigh tlb invalidation does a WB/INVAL of the L1/L2 GL data caches so TCC will not be hit on next request Signed-off-by: shaoyunl Reviewed-by: Felix Kuehling Signed-off-by: Felix Kuehling Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v9.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v9.c index 6574814d2ade..d5af41143d12 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v9.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v9.c @@ -726,29 +726,8 @@ static uint16_t get_atc_vmid_pasid_mapping_pasid(struct kgd_dev *kgd, return reg & ATC_VMID0_PASID_MAPPING__PASID_MASK; } -static void write_vmid_invalidate_request(struct kgd_dev *kgd, uint8_t vmid) -{ - struct amdgpu_device *adev = (struct amdgpu_device *) kgd; - - /* Use legacy mode tlb invalidation. - * - * Currently on Raven the code below is broken for anything but - * legacy mode due to a MMHUB power gating problem. A workaround - * is for MMHUB to wait until the condition PER_VMID_INVALIDATE_REQ - * == PER_VMID_INVALIDATE_ACK instead of simply waiting for the ack - * bit. - * - * TODO 1: agree on the right set of invalidation registers for - * KFD use. Use the last one for now. Invalidate both GC and - * MMHUB. - * - * TODO 2: support range-based invalidation, requires kfg2kgd - * interface change - */ - amdgpu_gmc_flush_gpu_tlb(adev, vmid, 0); -} - -static int invalidate_tlbs_with_kiq(struct amdgpu_device *adev, uint16_t pasid) +static int invalidate_tlbs_with_kiq(struct amdgpu_device *adev, uint16_t pasid, + uint32_t flush_type) { signed long r; uint32_t seq; @@ -761,7 +740,7 @@ static int invalidate_tlbs_with_kiq(struct amdgpu_device *adev, uint16_t pasid) PACKET3_INVALIDATE_TLBS_DST_SEL(1) | PACKET3_INVALIDATE_TLBS_ALL_HUB(1) | PACKET3_INVALIDATE_TLBS_PASID(pasid) | - PACKET3_INVALIDATE_TLBS_FLUSH_TYPE(0)); /* legacy */ + PACKET3_INVALIDATE_TLBS_FLUSH_TYPE(flush_type)); amdgpu_fence_emit_polling(ring, &seq); amdgpu_ring_commit(ring); spin_unlock(&adev->gfx.kiq.ring_lock); @@ -780,12 +759,16 @@ static int invalidate_tlbs(struct kgd_dev *kgd, uint16_t pasid) struct amdgpu_device *adev = (struct amdgpu_device *) kgd; int vmid; struct amdgpu_ring *ring = &adev->gfx.kiq.ring; + uint32_t flush_type = 0; if (adev->in_gpu_reset) return -EIO; + if (adev->gmc.xgmi.num_physical_nodes && + adev->asic_type == CHIP_VEGA20) + flush_type = 2; if (ring->sched.ready) - return invalidate_tlbs_with_kiq(adev, pasid); + return invalidate_tlbs_with_kiq(adev, pasid, flush_type); for (vmid = 0; vmid < 16; vmid++) { if (!amdgpu_amdkfd_is_kfd_vmid(adev, vmid)) @@ -793,7 +776,8 @@ static int invalidate_tlbs(struct kgd_dev *kgd, uint16_t pasid) if (get_atc_vmid_pasid_mapping_valid(kgd, vmid)) { if (get_atc_vmid_pasid_mapping_pasid(kgd, vmid) == pasid) { - write_vmid_invalidate_request(kgd, vmid); + amdgpu_gmc_flush_gpu_tlb(adev, vmid, + flush_type); break; } } @@ -811,7 +795,22 @@ static int invalidate_tlbs_vmid(struct kgd_dev *kgd, uint16_t vmid) return 0; } - write_vmid_invalidate_request(kgd, vmid); + /* Use legacy mode tlb invalidation. + * + * Currently on Raven the code below is broken for anything but + * legacy mode due to a MMHUB power gating problem. A workaround + * is for MMHUB to wait until the condition PER_VMID_INVALIDATE_REQ + * == PER_VMID_INVALIDATE_ACK instead of simply waiting for the ack + * bit. + * + * TODO 1: agree on the right set of invalidation registers for + * KFD use. Use the last one for now. Invalidate both GC and + * MMHUB. + * + * TODO 2: support range-based invalidation, requires kfg2kgd + * interface change + */ + amdgpu_gmc_flush_gpu_tlb(adev, vmid, 0); return 0; }