drm/amdgpu: update the vm invalidation engine layout V2

We need new invalidation engine layout due to new SDMA page
queues added.

V2: fix coding style and add correct return value
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Oak Zeng <Oak.Zeng@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -718,37 +718,46 @@ static bool gmc_v9_0_keep_stolen_memory(struct amdgpu_device *adev)
 	}
 }
 
-static int gmc_v9_0_late_init(void *handle)
+static int gmc_v9_0_allocate_vm_inv_eng(struct amdgpu_device *adev)
 {
-	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
-	/*
-	 * The latest engine allocation on gfx9 is:
-	 * Engine 0, 1: idle
-	 * Engine 2, 3: firmware
-	 * Engine 4~13: amdgpu ring, subject to change when ring number changes
-	 * Engine 14~15: idle
-	 * Engine 16: kfd tlb invalidation
-	 * Engine 17: Gart flushes
-	 */
-	unsigned vm_inv_eng[AMDGPU_MAX_VMHUBS] = { 4, 4 };
+	struct amdgpu_ring *ring;
+	unsigned vm_inv_engs[AMDGPU_MAX_VMHUBS] =
+		{GFXHUB_FREE_VM_INV_ENGS_BITMAP, MMHUB_FREE_VM_INV_ENGS_BITMAP};
 	unsigned i;
-	int r;
+	unsigned vmhub, inv_eng;
 
-	if (!gmc_v9_0_keep_stolen_memory(adev))
-		amdgpu_bo_late_init(adev);
+	for (i = 0; i < adev->num_rings; ++i) {
+		ring = adev->rings[i];
+		vmhub = ring->funcs->vmhub;
+
+		inv_eng = ffs(vm_inv_engs[vmhub]);
+		if (!inv_eng) {
+			dev_err(adev->dev, "no VM inv eng for ring %s\n",
+				ring->name);
+			return -EINVAL;
+		}
 
-	for(i = 0; i < adev->num_rings; ++i) {
-		struct amdgpu_ring *ring = adev->rings[i];
-		unsigned vmhub = ring->funcs->vmhub;
+		ring->vm_inv_eng = inv_eng - 1;
+		change_bit(inv_eng - 1, (unsigned long *)(&vm_inv_engs[vmhub]));
 
-		ring->vm_inv_eng = vm_inv_eng[vmhub]++;
 		dev_info(adev->dev, "ring %s uses VM inv eng %u on hub %u\n",
 			 ring->name, ring->vm_inv_eng, ring->funcs->vmhub);
 	}
 
-	/* Engine 16 is used for KFD and 17 for GART flushes */
-	for(i = 0; i < AMDGPU_MAX_VMHUBS; ++i)
-		BUG_ON(vm_inv_eng[i] > 16);
+	return 0;
+}
+
+static int gmc_v9_0_late_init(void *handle)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+	int r;
+
+	if (!gmc_v9_0_keep_stolen_memory(adev))
+		amdgpu_bo_late_init(adev);
+
+	r = gmc_v9_0_allocate_vm_inv_eng(adev);
+	if (r)
+		return r;
 
 	if (adev->asic_type == CHIP_VEGA10 && !amdgpu_sriov_vf(adev)) {
 		r = gmc_v9_0_ecc_available(adev);

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

@@ -24,6 +24,16 @@
 #ifndef __GMC_V9_0_H__
 #define __GMC_V9_0_H__
 
+	/*
+	 * The latest engine allocation on gfx9 is:
+	 * Engine 2, 3: firmware
+	 * Engine 0, 1, 4~16: amdgpu ring,
+	 *                    subject to change when ring number changes
+	 * Engine 17: Gart flushes
+	 */
+#define GFXHUB_FREE_VM_INV_ENGS_BITMAP		0x1FFF3
+#define MMHUB_FREE_VM_INV_ENGS_BITMAP		0x1FFF3
+
 extern const struct amd_ip_funcs gmc_v9_0_ip_funcs;
 extern const struct amdgpu_ip_block_version gmc_v9_0_ip_block;