From: Apurv Mishra Apurv.Mishra@amd.com
[ Upstream commit daafa303d19f5522e4c24fbf5c1c981a16df2c2f ]
Remove workaround code for the early engineering samples GC v9.4.3 SOCs with revID 0
Reviewed-by: Amber Lin Amber.Lin@amd.com Signed-off-by: Apurv Mishra Apurv.Mishra@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org ---
Perfect! Now I have the complete picture. Let me analyze this commit based on the context: **YES** This commit should be backported to stable kernel trees. Here's my extensive analysis: ## Nature of the Change This commit removes workaround code that was specifically designed for early engineering samples of GC v9.4.3 SOCs with revision ID 0 (A0 hardware). The commit: 1. **Adds explicit A0 hardware rejection** in `amdgpu_device.c:2675-2682` - Any GC 9.4.3 devices with revID 0 are now explicitly rejected with "Unsupported A0 hardware" error and return `-ENODEV`. 2. **Removes complex conditional logic** that was checking `adev->rev_id` throughout multiple files: - In `gmc_v9_0.c`: Simplifies memory type selection logic - In `kfd_device.c`: Removes revision- specific GFX target version handling - In `kfd_queue.c`: Simplifies VGPR size and buffer size calculations - In `kfd_svm.c`: Simplifies memory type selection for SVM 3. **Removes TLB flush workaround** (`flush_tlb_needs_extra_type_0`) that was specific to GC 9.4.3 revID 0. ## Why This Should Be Backported ### 1. **Cleanup of Engineering Sample Support** This commit removes support for early engineering samples that should not be in production systems. The comment in the code even states these are "early engineering samples" that were never meant for widespread use. ### 2. **Improves System Stability** The removed workarounds were described as "badly documented and had a buggy implementation" (as seen in the original TLB workaround code). Removing buggy workarounds improves overall system stability. ### 3. **Code Simplification** The changes significantly simplify multiple code paths by removing complex conditional logic based on revision IDs. This reduces maintenance burden and potential for bugs. ### 4. **Clear Hardware Support Policy** By explicitly rejecting unsupported A0 hardware with `-ENODEV`, the commit provides clear feedback to users rather than allowing systems to run with potentially unreliable workarounds. ### 5. **Follows Stable Tree Guidelines** - **Bug fix nature**: Removes buggy workaround code - **Minimal risk**: The changes are well-contained and only affect early engineering samples - **No new features**: This is purely cleanup/bug fix - **Clear scope**: Limited to specific GC 9.4.3 revID 0 hardware ### 6. **Reference to Similar Commits** Looking at the similar commits provided: - Similar commits that add support for new hardware IPs (like the NO examples) are typically not backported - However, commits that fix existing functionality (like the YES example) are good candidates - This commit aligns more with the YES example as it's fixing/cleaning up existing problematic code ### 7. **Production Impact** Since this only affects early engineering samples that shouldn't be in production, the impact on real users is minimal while providing benefits in terms of code maintainability and system reliability. The commit clearly fits the stable tree criteria: it fixes problematic code, has minimal risk of regression, doesn't introduce new features, and improves system reliability for supported hardware while properly rejecting unsupported hardware.
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 8 +++++++- drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 14 ++------------ drivers/gpu/drm/amd/amdkfd/kfd_device.c | 5 ----- drivers/gpu/drm/amd/amdkfd/kfd_queue.c | 4 ++-- drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 3 +-- 5 files changed, 12 insertions(+), 22 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index f8b3e04d71eda..95124a4a0a67c 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -2689,6 +2689,13 @@ static int amdgpu_device_ip_early_init(struct amdgpu_device *adev) break; }
+ /* Check for IP version 9.4.3 with A0 hardware */ + if (amdgpu_ip_version(adev, GC_HWIP, 0) == IP_VERSION(9, 4, 3) && + !amdgpu_device_get_rev_id(adev)) { + dev_err(adev->dev, "Unsupported A0 hardware\n"); + return -ENODEV; /* device unsupported - no device error */ + } + if (amdgpu_has_atpx() && (amdgpu_is_atpx_hybrid() || amdgpu_has_atpx_dgpu_power_cntl()) && @@ -2701,7 +2708,6 @@ static int amdgpu_device_ip_early_init(struct amdgpu_device *adev) adev->has_pr3 = parent ? pci_pr3_present(parent) : false; }
- adev->pm.pp_feature = amdgpu_pp_feature_mask; if (amdgpu_sriov_vf(adev) || sched_policy == KFD_SCHED_POLICY_NO_HWS) adev->pm.pp_feature &= ~PP_GFXOFF_MASK; diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c index 5effe8327d29f..53050176c244d 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c @@ -1213,10 +1213,7 @@ static void gmc_v9_0_get_coherence_flags(struct amdgpu_device *adev, if (uncached) { mtype = MTYPE_UC; } else if (ext_coherent) { - if (gc_ip_version == IP_VERSION(9, 5, 0) || adev->rev_id) - mtype = is_local ? MTYPE_CC : MTYPE_UC; - else - mtype = MTYPE_UC; + mtype = is_local ? MTYPE_CC : MTYPE_UC; } else if (adev->flags & AMD_IS_APU) { mtype = is_local ? mtype_local : MTYPE_NC; } else { @@ -1336,7 +1333,7 @@ static void gmc_v9_0_override_vm_pte_flags(struct amdgpu_device *adev, mtype_local = MTYPE_CC;
*flags = AMDGPU_PTE_MTYPE_VG10(*flags, mtype_local); - } else if (adev->rev_id) { + } else { /* MTYPE_UC case */ *flags = AMDGPU_PTE_MTYPE_VG10(*flags, MTYPE_CC); } @@ -2411,13 +2408,6 @@ static int gmc_v9_0_hw_init(struct amdgpu_ip_block *ip_block) adev->gmc.flush_tlb_needs_extra_type_2 = amdgpu_ip_version(adev, GC_HWIP, 0) == IP_VERSION(9, 4, 0) && adev->gmc.xgmi.num_physical_nodes; - /* - * TODO: This workaround is badly documented and had a buggy - * implementation. We should probably verify what we do here. - */ - adev->gmc.flush_tlb_needs_extra_type_0 = - amdgpu_ip_version(adev, GC_HWIP, 0) == IP_VERSION(9, 4, 3) && - adev->rev_id == 0;
/* The sequence of these two function calls matters.*/ gmc_v9_0_init_golden_registers(adev); diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c index b9c82be6ce134..bf0854bd55551 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c @@ -352,11 +352,6 @@ struct kfd_dev *kgd2kfd_probe(struct amdgpu_device *adev, bool vf) f2g = &aldebaran_kfd2kgd; break; case IP_VERSION(9, 4, 3): - gfx_target_version = adev->rev_id >= 1 ? 90402 - : adev->flags & AMD_IS_APU ? 90400 - : 90401; - f2g = &gc_9_4_3_kfd2kgd; - break; case IP_VERSION(9, 4, 4): gfx_target_version = 90402; f2g = &gc_9_4_3_kfd2kgd; diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_queue.c b/drivers/gpu/drm/amd/amdkfd/kfd_queue.c index 4afff7094cafc..a65c67cf56ff3 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_queue.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_queue.c @@ -402,7 +402,7 @@ static u32 kfd_get_vgpr_size_per_cu(u32 gfxv) { u32 vgpr_size = 0x40000;
- if ((gfxv / 100 * 100) == 90400 || /* GFX_VERSION_AQUA_VANJARAM */ + if (gfxv == 90402 || /* GFX_VERSION_AQUA_VANJARAM */ gfxv == 90010 || /* GFX_VERSION_ALDEBARAN */ gfxv == 90008 || /* GFX_VERSION_ARCTURUS */ gfxv == 90500) @@ -462,7 +462,7 @@ void kfd_queue_ctx_save_restore_size(struct kfd_topology_device *dev)
if (gfxv == 80002) /* GFX_VERSION_TONGA */ props->eop_buffer_size = 0x8000; - else if ((gfxv / 100 * 100) == 90400) /* GFX_VERSION_AQUA_VANJARAM */ + else if (gfxv == 90402) /* GFX_VERSION_AQUA_VANJARAM */ props->eop_buffer_size = 4096; else if (gfxv >= 80000) props->eop_buffer_size = 4096; diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c index 100717a98ec11..72be6e152e881 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c @@ -1245,8 +1245,7 @@ svm_range_get_pte_flags(struct kfd_node *node, case IP_VERSION(9, 4, 4): case IP_VERSION(9, 5, 0): if (ext_coherent) - mtype_local = (gc_ip_version < IP_VERSION(9, 5, 0) && !node->adev->rev_id) ? - AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_CC; + mtype_local = AMDGPU_VM_MTYPE_CC; else mtype_local = amdgpu_mtype_local == 1 ? AMDGPU_VM_MTYPE_NC : amdgpu_mtype_local == 2 ? AMDGPU_VM_MTYPE_CC : AMDGPU_VM_MTYPE_RW;