diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/1876-drm-amdgpu-drop-the-busy-wait-for-GMC-v9-TLB-invalid.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/1876-drm-amdgpu-drop-the-busy-wait-for-GMC-v9-TLB-invalid.patch | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/1876-drm-amdgpu-drop-the-busy-wait-for-GMC-v9-TLB-invalid.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/1876-drm-amdgpu-drop-the-busy-wait-for-GMC-v9-TLB-invalid.patch new file mode 100644 index 00000000..e320bde0 --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/1876-drm-amdgpu-drop-the-busy-wait-for-GMC-v9-TLB-invalid.patch @@ -0,0 +1,65 @@ +From d01ac318ae227edb4db3c9bbd599cd62b20f3308 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com> +Date: Thu, 25 Oct 2018 10:50:42 +0200 +Subject: [PATCH 1876/2940] drm/amdgpu: drop the busy wait for GMC v9 TLB + invalidations +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +This code is not performance critical. + +Signed-off-by: Christian König <christian.koenig@amd.com> +Reviewed-by: Emily Deng <Emily.Deng@amd.com> +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +--- + drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 26 ++++---------------------- + 1 file changed, 4 insertions(+), 22 deletions(-) + +diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c +index af3d0bb07eb8..27832660ee02 100644 +--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c ++++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c +@@ -430,35 +430,17 @@ static void gmc_v9_0_flush_gpu_tlb(struct amdgpu_device *adev, + } + + spin_lock(&adev->gmc.invalidate_lock); +- + WREG32_NO_KIQ(hub->vm_inv_eng0_req + eng, tmp); +- +- /* Busy wait for ACK.*/ +- for (j = 0; j < 100; j++) { +- tmp = RREG32_NO_KIQ(hub->vm_inv_eng0_ack + eng); +- tmp &= 1 << vmid; +- if (tmp) +- break; +- cpu_relax(); +- } +- if (j < 100) { +- spin_unlock(&adev->gmc.invalidate_lock); +- continue; +- } +- +- /* Wait for ACK with a delay.*/ + for (j = 0; j < adev->usec_timeout; j++) { + tmp = RREG32_NO_KIQ(hub->vm_inv_eng0_ack + eng); +- tmp &= 1 << vmid; +- if (tmp) ++ if (tmp & (1 << vmid)) + break; + udelay(1); + } +- if (j < adev->usec_timeout) { +- spin_unlock(&adev->gmc.invalidate_lock); +- continue; +- } + spin_unlock(&adev->gmc.invalidate_lock); ++ if (j < adev->usec_timeout) ++ continue; ++ + DRM_ERROR("Timeout waiting for VM flush ACK!\n"); + } + } +-- +2.17.1 + |