drm/amdkfd: APU mode set max svm range pages

svm_migrate_init set the max svm range pages based on the KFD nodes
partition size. APU mode don't init pgmap because there is no migration.

kgd2kfd_device_init calls svm_migrate_init after KFD nodes allocation
and initialization.
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_device.c

@@ -724,9 +724,6 @@ bool kgd2kfd_device_init(struct kfd_dev *kfd,
 
 	kfd_cwsr_init(kfd);
 
-	svm_migrate_init(kfd->adev);
-
-
 	dev_info(kfd_device, "Total number of KFD nodes to be created: %d\n",
 				kfd->num_nodes);
 
@@ -794,6 +791,8 @@ bool kgd2kfd_device_init(struct kfd_dev *kfd,
 		kfd->nodes[i] = node;
 	}
 
+	svm_migrate_init(kfd->adev);
+
 	if (kfd_resume_iommu(kfd))
 		goto kfd_resume_iommu_error;
 

drivers/gpu/drm/amd/amdkfd/kfd_migrate.c

@@ -1000,6 +1000,11 @@ int svm_migrate_init(struct amdgpu_device *adev)
 	if (!KFD_IS_SOC15(kfddev->dev))
 		return -EINVAL;
 
+	svm_range_set_max_pages(adev);
+
+	if (adev->gmc.is_app_apu)
+		return 0;
+
 	pgmap = &kfddev->pgmap;
 	memset(pgmap, 0, sizeof(*pgmap));
 
@@ -1042,8 +1047,6 @@ int svm_migrate_init(struct amdgpu_device *adev)
 
 	amdgpu_amdkfd_reserve_system_mem(SVM_HMM_PAGE_STRUCT_SIZE(size));
 
-	svm_range_set_max_pages(adev);
-
 	pr_info("HMM registered %ldMB device memory\n", size >> 20);
 
 	return 0;

drivers/gpu/drm/amd/amdkfd/kfd_svm.c

@@ -1938,14 +1938,19 @@ void svm_range_set_max_pages(struct amdgpu_device *adev)
 {
 	uint64_t max_pages;
 	uint64_t pages, _pages;
+	uint64_t min_pages = 0;
+	int i;
+
+	for (i = 0; i < adev->kfd.dev->num_nodes; i++) {
+		pages = KFD_XCP_MEMORY_SIZE(adev, adev->kfd.dev->nodes[i]->xcp->id) >> 17;
+		pages = clamp(pages, 1ULL << 9, 1ULL << 18);
+		pages = rounddown_pow_of_two(pages);
+		min_pages = min_not_zero(min_pages, pages);
+	}
 
-	/* 1/32 VRAM size in pages */
-	pages = adev->gmc.real_vram_size >> 17;
-	pages = clamp(pages, 1ULL << 9, 1ULL << 18);
-	pages = rounddown_pow_of_two(pages);
 	do {
 		max_pages = READ_ONCE(max_svm_range_pages);
-		_pages = min_not_zero(max_pages, pages);
+		_pages = min_not_zero(max_pages, min_pages);
 	} while (cmpxchg(&max_svm_range_pages, max_pages, _pages) != max_pages);
 }