Re: [PATCHv4] drm/amdgpu: Update invalid PTE flag setting

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Am 19.06.23 um 19:38 schrieb Mukul Joshi:
Update the invalid PTE flag setting with TF enabled.
This is to ensure, in addition to transitioning the
retry fault to a no-retry fault, it also causes the
wavefront to enter the trap handler. With the current
setting, the fault only transitions to a no-retry fault.
Additionally, have 2 sets of invalid PTE settings, one for
TF enabled, the other for TF disabled. The setting with
TF disabled, doesn't work with TF enabled.

Signed-off-by: Mukul Joshi <mukul.joshi@xxxxxxx>

Acked-by: Christian König <christian.koenig@xxxxxxx>

---
v1->v2:
- Update handling according to Christian's feedback.

v2->v3:
- Remove ASIC specific callback (Felix).

v3->v4:
- Add noretry flag to amdgpu->gmc. This allows to set
   ASIC specific flags.

  drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h   |  2 ++
  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c    |  2 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h    |  6 +++++
  drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c | 31 +++++++++++++++++++++++
  drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c    |  1 +
  drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c    |  1 +
  drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c     |  1 +
  drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c     |  1 +
  drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c     |  1 +
  9 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
index 56d73fade568..fdc25cd559b6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
@@ -331,6 +331,8 @@ struct amdgpu_gmc {
  	u64 VM_CONTEXT_PAGE_TABLE_END_ADDR_LO32[16];
  	u64 VM_CONTEXT_PAGE_TABLE_END_ADDR_HI32[16];
  	u64 MC_VM_MX_L1_TLB_CNTL;
+
+	u64 noretry_flags;
  };
#define amdgpu_gmc_flush_gpu_tlb(adev, vmid, vmhub, type) ((adev)->gmc.gmc_funcs->flush_gpu_tlb((adev), (vmid), (vmhub), (type)))
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index eff73c428b12..8c7861a4d75d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2604,7 +2604,7 @@ bool amdgpu_vm_handle_fault(struct amdgpu_device *adev, u32 pasid,
  		/* Intentionally setting invalid PTE flag
  		 * combination to force a no-retry-fault
  		 */
-		flags = AMDGPU_PTE_SNOOPED | AMDGPU_PTE_PRT;
+		flags = AMDGPU_VM_NORETRY_FLAGS;
  		value = 0;
  	} else if (amdgpu_vm_fault_stop == AMDGPU_VM_FAULT_STOP_NEVER) {
  		/* Redirect the access to the dummy page */
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 9c85d494f2a2..b81fcb962d8f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -84,7 +84,13 @@ struct amdgpu_mem_stats;
  /* PDE Block Fragment Size for VEGA10 */
  #define AMDGPU_PDE_BFS(a)	((uint64_t)a << 59)
+/* Flag combination to set no-retry with TF disabled */
+#define AMDGPU_VM_NORETRY_FLAGS	(AMDGPU_PTE_EXECUTABLE | AMDGPU_PDE_PTE | \
+				AMDGPU_PTE_TF)
+/* Flag combination to set no-retry with TF enabled */
+#define AMDGPU_VM_NORETRY_FLAGS_TF (AMDGPU_PTE_VALID | AMDGPU_PTE_SYSTEM | \
+				   AMDGPU_PTE_PRT)
  /* For GFX9 */
  #define AMDGPU_PTE_MTYPE_VG10(a)	((uint64_t)(a) << 57)
  #define AMDGPU_PTE_MTYPE_VG10_MASK	AMDGPU_PTE_MTYPE_VG10(3ULL)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c
index dea1a64be44d..24ddf6a0512a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c
@@ -778,6 +778,27 @@ int amdgpu_vm_pde_update(struct amdgpu_vm_update_params *params,
  					1, 0, flags);
  }
+/**
+ * amdgpu_vm_pte_update_noretry_flags - Update PTE no-retry flags
+ *
+ * @adev - amdgpu_device pointer
+ * @flags: pointer to PTE flags
+ *
+ * Update PTE no-retry flags when TF is enabled.
+ */
+static void amdgpu_vm_pte_update_noretry_flags(struct amdgpu_device *adev,
+						uint64_t *flags)
+{
+	/*
+	 * Update no-retry flags with the corresponding TF
+	 * no-retry combination.
+	 */
+	if ((*flags & AMDGPU_VM_NORETRY_FLAGS) == AMDGPU_VM_NORETRY_FLAGS) {
+		*flags &= ~AMDGPU_VM_NORETRY_FLAGS;
+		*flags |= adev->gmc.noretry_flags;
+	}
+}
+
  /*
   * amdgpu_vm_pte_update_flags - figure out flags for PTE updates
   *
@@ -804,6 +825,16 @@ static void amdgpu_vm_pte_update_flags(struct amdgpu_vm_update_params *params,
  		flags |= AMDGPU_PTE_EXECUTABLE;
  	}
+ /*
+	 * Update no-retry flags to use the no-retry flag combination
+	 * with TF enabled. The AMDGPU_VM_NORETRY_FLAGS flag combination
+	 * does not work when TF is enabled. So, replace them with
+	 * AMDGPU_VM_NORETRY_FLAGS_TF flag combination which works for
+	 * all cases.
+	 */
+	if (level == AMDGPU_VM_PTB)
+		amdgpu_vm_pte_update_noretry_flags(adev, &flags);
+
  	/* APUs mapping system memory may need different MTYPEs on different
  	 * NUMA nodes. Only do this for contiguous ranges that can be assumed
  	 * to be on the same NUMA node.
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
index 0c8a47989576..13b89f78d07d 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
@@ -751,6 +751,7 @@ static int gmc_v10_0_early_init(void *handle)
  	adev->gmc.private_aperture_start = 0x1000000000000000ULL;
  	adev->gmc.private_aperture_end =
  		adev->gmc.private_aperture_start + (4ULL << 30) - 1;
+	adev->gmc.noretry_flags = AMDGPU_VM_NORETRY_FLAGS_TF;
return 0;
  }
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
index c571f0d95994..c68ecb7dfa39 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
@@ -651,6 +651,7 @@ static int gmc_v11_0_early_init(void *handle)
  	adev->gmc.private_aperture_start = 0x1000000000000000ULL;
  	adev->gmc.private_aperture_end =
  		adev->gmc.private_aperture_start + (4ULL << 30) - 1;
+	adev->gmc.noretry_flags = AMDGPU_VM_NORETRY_FLAGS_TF;
return 0;
  }
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
index acd2b407860f..027b14603037 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
@@ -942,6 +942,7 @@ static int gmc_v7_0_early_init(void *handle)
  		adev->gmc.shared_aperture_end + 1;
  	adev->gmc.private_aperture_end =
  		adev->gmc.private_aperture_start + (4ULL << 30) - 1;
+	adev->gmc.noretry_flags = AMDGPU_VM_NORETRY_FLAGS_TF;
return 0;
  }
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
index 85dead2a5702..581ed922dbe3 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
@@ -1056,6 +1056,7 @@ static int gmc_v8_0_early_init(void *handle)
  		adev->gmc.shared_aperture_end + 1;
  	adev->gmc.private_aperture_end =
  		adev->gmc.private_aperture_start + (4ULL << 30) - 1;
+	adev->gmc.noretry_flags = AMDGPU_VM_NORETRY_FLAGS_TF;
return 0;
  }
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 67e669e0141c..ebdbc823fae3 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1622,6 +1622,7 @@ static int gmc_v9_0_early_init(void *handle)
  	adev->gmc.private_aperture_start = 0x1000000000000000ULL;
  	adev->gmc.private_aperture_end =
  		adev->gmc.private_aperture_start + (4ULL << 30) - 1;
+	adev->gmc.noretry_flags = AMDGPU_VM_NORETRY_FLAGS_TF;
return 0;
  }




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