drm/amdgpu: set vm size and block size by individual gmc by default (v3)

By default, the value is set by individual gmc.
if a specific value is input, it overrides the global value for all

v2: create helper funcs
v3: update gmc9 APU's num_level athough it may be updated in the future.
Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -1040,35 +1040,31 @@ static bool amdgpu_check_pot_argument(int arg)
 	return (arg & (arg - 1)) == 0;
 }
 
-static void amdgpu_get_block_size(struct amdgpu_device *adev)
+static void amdgpu_check_block_size(struct amdgpu_device *adev)
 {
 	/* defines number of bits in page table versus page directory,
 	 * a page is 4KB so we have 12 bits offset, minimum 9 bits in the
 	 * page table and the remaining bits are in the page directory */
-	if (amdgpu_vm_block_size == -1) {
-
-		/* Total bits covered by PD + PTs */
-		unsigned bits = ilog2(amdgpu_vm_size) + 18;
-
-		/* Make sure the PD is 4K in size up to 8GB address space.
-		   Above that split equal between PD and PTs */
-		if (amdgpu_vm_size <= 8)
-			amdgpu_vm_block_size = bits - 9;
-		else
-			amdgpu_vm_block_size = (bits + 3) / 2;
+	if (amdgpu_vm_block_size == -1)
+		return;
 
-	} else if (amdgpu_vm_block_size < 9) {
+	if (amdgpu_vm_block_size < 9) {
 		dev_warn(adev->dev, "VM page table size (%d) too small\n",
 			 amdgpu_vm_block_size);
-		amdgpu_vm_block_size = 9;
+		goto def_value;
 	}
 
 	if (amdgpu_vm_block_size > 24 ||
 	    (amdgpu_vm_size * 1024) < (1ull << amdgpu_vm_block_size)) {
 		dev_warn(adev->dev, "VM page table size (%d) too large\n",
 			 amdgpu_vm_block_size);
-		amdgpu_vm_block_size = 9;
+		goto def_value;
 	}
+
+	return;
+
+def_value:
+	amdgpu_vm_block_size = -1;
 }
 
 static void amdgpu_check_vm_size(struct amdgpu_device *adev)
@@ -1097,8 +1093,7 @@ static void amdgpu_check_vm_size(struct amdgpu_device *adev)
 	return;
 
 def_value:
-	amdgpu_vm_size = 8;
-	dev_info(adev->dev, "set default VM size %dGB\n", amdgpu_vm_size);
+	amdgpu_vm_size = -1;
 }
 
 /**
@@ -1132,7 +1127,7 @@ static void amdgpu_check_arguments(struct amdgpu_device *adev)
 
 	amdgpu_check_vm_size(adev);
 
-	amdgpu_get_block_size(adev);
+	amdgpu_check_block_size(adev);
 
 	if (amdgpu_vram_page_split != -1 && (amdgpu_vram_page_split < 16 ||
 	    !amdgpu_check_pot_argument(amdgpu_vram_page_split))) {

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -86,7 +86,7 @@ int amdgpu_runtime_pm = -1;
 unsigned amdgpu_ip_block_mask = 0xffffffff;
 int amdgpu_bapm = -1;
 int amdgpu_deep_color = 0;
-int amdgpu_vm_size = 64;
+int amdgpu_vm_size = -1;
 int amdgpu_vm_block_size = -1;
 int amdgpu_vm_fault_stop = 0;
 int amdgpu_vm_debug = 0;

drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c

@@ -2064,6 +2064,44 @@ void amdgpu_vm_bo_invalidate(struct amdgpu_device *adev,
 	}
 }
 
+static uint32_t amdgpu_vm_get_block_size(uint64_t vm_size)
+{
+	/* Total bits covered by PD + PTs */
+	unsigned bits = ilog2(vm_size) + 18;
+
+	/* Make sure the PD is 4K in size up to 8GB address space.
+	   Above that split equal between PD and PTs */
+	if (vm_size <= 8)
+		return (bits - 9);
+	else
+		return ((bits + 3) / 2);
+}
+
+/**
+ * amdgpu_vm_adjust_size - adjust vm size and block size
+ *
+ * @adev: amdgpu_device pointer
+ * @vm_size: the default vm size if it's set auto
+ */
+void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint64_t vm_size)
+{
+	/* adjust vm size firstly */
+	if (amdgpu_vm_size == -1)
+		adev->vm_manager.vm_size = vm_size;
+	else
+		adev->vm_manager.vm_size = amdgpu_vm_size;
+
+	/* block size depends on vm size */
+	if (amdgpu_vm_block_size == -1)
+		adev->vm_manager.block_size =
+			amdgpu_vm_get_block_size(adev->vm_manager.vm_size);
+	else
+		adev->vm_manager.block_size = amdgpu_vm_block_size;
+
+	DRM_INFO("vm size is %llu GB, block size is %u-bit\n",
+		adev->vm_manager.vm_size, adev->vm_manager.block_size);
+}
+
 /**
  * amdgpu_vm_init - initialize a vm instance
  *

drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h

@@ -234,5 +234,6 @@ int amdgpu_vm_bo_clear_mappings(struct amdgpu_device *adev,
 				uint64_t saddr, uint64_t size);
 void amdgpu_vm_bo_rmv(struct amdgpu_device *adev,
 		      struct amdgpu_bo_va *bo_va);
+void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint64_t vm_size);
 
 #endif

drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c

@@ -849,13 +849,9 @@ static int gmc_v6_0_sw_init(void *handle)
 	if (r)
 		return r;
 
-	adev->vm_manager.vm_size = amdgpu_vm_size;
-	adev->vm_manager.block_size = amdgpu_vm_block_size;
+	amdgpu_vm_adjust_size(adev, 64);
 	adev->vm_manager.max_pfn = adev->vm_manager.vm_size << 18;
 
-	DRM_INFO("vm size is %llu GB, block size is %d-bit\n",
-		adev->vm_manager.vm_size, adev->vm_manager.block_size);
-
 	adev->mc.mc_mask = 0xffffffffffULL;
 
 	adev->need_dma32 = false;

drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c

@@ -1003,13 +1003,9 @@ static int gmc_v7_0_sw_init(void *handle)
 	 * Currently set to 4GB ((1 << 20) 4k pages).
 	 * Max GPUVM size for cayman and SI is 40 bits.
 	 */
-	adev->vm_manager.vm_size = amdgpu_vm_size;
-	adev->vm_manager.block_size = amdgpu_vm_block_size;
+	amdgpu_vm_adjust_size(adev, 64);
 	adev->vm_manager.max_pfn = adev->vm_manager.vm_size << 18;
 
-	DRM_INFO("vm size is %llu GB, block size is %d-bit\n",
-		adev->vm_manager.vm_size, adev->vm_manager.block_size);
-
 	/* Set the internal MC address mask
 	 * This is the max address of the GPU's
 	 * internal address space.

drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c

@@ -1087,13 +1087,9 @@ static int gmc_v8_0_sw_init(void *handle)
 	 * Currently set to 4GB ((1 << 20) 4k pages).
 	 * Max GPUVM size for cayman and SI is 40 bits.
 	 */
-	adev->vm_manager.vm_size = amdgpu_vm_size;
-	adev->vm_manager.block_size = amdgpu_vm_block_size;
+	amdgpu_vm_adjust_size(adev, 64);
 	adev->vm_manager.max_pfn = adev->vm_manager.vm_size << 18;
 
-	DRM_INFO("vm size is %llu GB, block size is %d-bit\n",
-		adev->vm_manager.vm_size, adev->vm_manager.block_size);
-
 	/* Set the internal MC address mask
 	 * This is the max address of the GPU's
 	 * internal address space.

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

@@ -520,6 +520,11 @@ static int gmc_v9_0_vm_init(struct amdgpu_device *adev)
 	 * amdkfd will use VMIDs 8-15
 	 */
 	adev->vm_manager.num_ids = AMDGPU_NUM_OF_VMIDS;
+
+	/* TODO: fix num_level for APU when updating vm size and block size */
+	if (adev->flags & AMD_IS_APU)
+		adev->vm_manager.num_level = 1;
+	else
 		adev->vm_manager.num_level = 3;
 	amdgpu_vm_manager_init(adev);
 
@@ -552,8 +557,7 @@ static int gmc_v9_0_sw_init(void *handle)
 
 	if (adev->flags & AMD_IS_APU) {
 		adev->mc.vram_type = AMDGPU_VRAM_TYPE_UNKNOWN;
-		adev->vm_manager.vm_size = amdgpu_vm_size;
-		adev->vm_manager.block_size = amdgpu_vm_block_size;
+		amdgpu_vm_adjust_size(adev, 64);
 	} else {
 		/* XXX Don't know how to get VRAM type yet. */
 		adev->mc.vram_type = AMDGPU_VRAM_TYPE_HBM;
@@ -564,11 +568,11 @@ static int gmc_v9_0_sw_init(void *handle)
 		 */
 		adev->vm_manager.vm_size = 1U << 18;
 		adev->vm_manager.block_size = 9;
+		DRM_INFO("vm size is %llu GB, block size is %u-bit\n",
+				adev->vm_manager.vm_size,
+				adev->vm_manager.block_size);
 	}
 
-	DRM_INFO("vm size is %llu GB, block size is %d-bit\n",
-		adev->vm_manager.vm_size, adev->vm_manager.block_size);
-
 	/* This interrupt is VMC page fault.*/
 	r = amdgpu_irq_add_id(adev, AMDGPU_IH_CLIENTID_VMC, 0,
 				&adev->mc.vm_fault);