[PATCH 6/6] drm/amdgpu: implement PRT for GFX8

[Christian König]

From: Christian König <christian.koenig at amd.com>

Enable/disable the handling globally for now and
print a warning when we enable it for the first time.

Signed-off-by: Junwei Zhang <Jerry.Zhang at amd.com>
Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 57 +++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
index 7669b32..d950a03 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
@@ -595,6 +595,62 @@ static void gmc_v8_0_set_fault_enable_default(struct amdgpu_device *adev,
 }
 
 /**
+ * gmc_v8_0_set_prt - set PRT VM fault
+ *
+ * @adev: amdgpu_device pointer
+ * @enable: enable/disable VM fault handling for PRT
+*/
+static void gmc_v8_0_set_prt(struct amdgpu_device *adev, bool enable)
+{
+	u32 tmp;
+
+	if (enable && !adev->mc.prt_warning) {
+		dev_warn(adev->dev, "Disabling VM faults because of PRT request!\n");
+		adev->mc.prt_warning = true;
+	}
+
+	tmp = RREG32(mmVM_PRT_CNTL);
+	tmp = REG_SET_FIELD(tmp, VM_PRT_CNTL,
+			    CB_DISABLE_READ_FAULT_ON_UNMAPPED_ACCESS, enable);
+	tmp = REG_SET_FIELD(tmp, VM_PRT_CNTL,
+			    CB_DISABLE_WRITE_FAULT_ON_UNMAPPED_ACCESS, enable);
+	tmp = REG_SET_FIELD(tmp, VM_PRT_CNTL,
+			    TC_DISABLE_READ_FAULT_ON_UNMAPPED_ACCESS, enable);
+	tmp = REG_SET_FIELD(tmp, VM_PRT_CNTL,
+			    TC_DISABLE_WRITE_FAULT_ON_UNMAPPED_ACCESS, enable);
+	tmp = REG_SET_FIELD(tmp, VM_PRT_CNTL,
+			    L2_CACHE_STORE_INVALID_ENTRIES, enable);
+	tmp = REG_SET_FIELD(tmp, VM_PRT_CNTL,
+			    L1_TLB_STORE_INVALID_ENTRIES, enable);
+	tmp = REG_SET_FIELD(tmp, VM_PRT_CNTL,
+			    MASK_PDE0_FAULT, enable);
+	WREG32(mmVM_CONTEXT1_CNTL, tmp);
+
+	if (enable) {
+		uint32_t low = AMDGPU_VA_RESERVED_SIZE >> AMDGPU_GPU_PAGE_SHIFT;
+		uint32_t high = adev->vm_manager.max_pfn;
+
+		WREG32(mmVM_PRT_APERTURE0_LOW_ADDR, low);
+		WREG32(mmVM_PRT_APERTURE1_LOW_ADDR, low);
+		WREG32(mmVM_PRT_APERTURE2_LOW_ADDR, low);
+		WREG32(mmVM_PRT_APERTURE3_LOW_ADDR, low);
+		WREG32(mmVM_PRT_APERTURE0_HIGH_ADDR, high);
+		WREG32(mmVM_PRT_APERTURE1_HIGH_ADDR, high);
+		WREG32(mmVM_PRT_APERTURE2_HIGH_ADDR, high);
+		WREG32(mmVM_PRT_APERTURE3_HIGH_ADDR, high);
+	} else {
+		WREG32(mmVM_PRT_APERTURE0_LOW_ADDR, 0xfffffff);
+		WREG32(mmVM_PRT_APERTURE1_LOW_ADDR, 0xfffffff);
+		WREG32(mmVM_PRT_APERTURE2_LOW_ADDR, 0xfffffff);
+		WREG32(mmVM_PRT_APERTURE3_LOW_ADDR, 0xfffffff);
+		WREG32(mmVM_PRT_APERTURE0_HIGH_ADDR, 0x0);
+		WREG32(mmVM_PRT_APERTURE1_HIGH_ADDR, 0x0);
+		WREG32(mmVM_PRT_APERTURE2_HIGH_ADDR, 0x0);
+		WREG32(mmVM_PRT_APERTURE3_HIGH_ADDR, 0x0);
+	}
+}
+
+/**
  * gmc_v8_0_gart_enable - gart enable
  *
  * @adev: amdgpu_device pointer
@@ -1485,6 +1541,7 @@ static const struct amd_ip_funcs gmc_v8_0_ip_funcs = {
 static const struct amdgpu_gart_funcs gmc_v8_0_gart_funcs = {
 	.flush_gpu_tlb = gmc_v8_0_gart_flush_gpu_tlb,
 	.set_pte_pde = gmc_v8_0_gart_set_pte_pde,
+	.set_prt = gmc_v8_0_set_prt,
 };
 
 static const struct amdgpu_irq_src_funcs gmc_v8_0_irq_funcs = {
-- 
2.5.0