[PATCH] drm/amdkfd: fix svm_migrate_fini warning

[Philip Yang <Philip.Yang@amd.com>]

Don't use devm_request_free_mem_region to alloc VRAM region for pgmap,
because driver__detach releases all device resource region, then calls
amdgpu_device_fini_sw, which calls devm_memunmap_pages generating below
warning trace:

WARNING: CPU: 1 PID: 3646 at drivers/base/devres.c:795
devm_release_action+0x51/0x60
Call Trace:
    ? memunmap_pages+0x360/0x360
    svm_migrate_fini+0x2d/0x60 [amdgpu]
    kgd2kfd_device_exit+0x23/0xa0 [amdgpu]
    amdgpu_amdkfd_device_fini_sw+0x1d/0x30 [amdgpu]
    amdgpu_device_fini_sw+0x45/0x290 [amdgpu]
    amdgpu_driver_release_kms+0x12/0x30 [amdgpu]
    drm_dev_release+0x20/0x40 [drm]
    release_nodes+0x196/0x1e0
    device_release_driver_internal+0x104/0x1d0
    driver_detach+0x47/0x90
    bus_remove_driver+0x7a/0xd0
    pci_unregister_driver+0x3d/0x90
    amdgpu_exit+0x11/0x20 [amdgpu]
Trying to free nonexistent resource <000007fc00000000-000007fdffffffff>

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
index 21f745e0b86c..aa96767920a9 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
@@ -880,7 +880,7 @@ int svm_migrate_init(struct amdgpu_device *adev)
 	 * should remove reserved size
 	 */
 	size = ALIGN(adev->gmc.real_vram_size, 2ULL << 20);
-	res = devm_request_free_mem_region(adev->dev, &iomem_resource, size);
+	res = request_free_mem_region(&iomem_resource, size, "amdgpu_vram");
 	if (IS_ERR(res))
 		return -ENOMEM;
 
@@ -891,14 +891,13 @@ int svm_migrate_init(struct amdgpu_device *adev)
 	pgmap->ops = &svm_migrate_pgmap_ops;
 	pgmap->owner = SVM_ADEV_PGMAP_OWNER(adev);
 	pgmap->flags = MIGRATE_VMA_SELECT_DEVICE_PRIVATE;
-	r = devm_memremap_pages(adev->dev, pgmap);
+	r = memremap_pages(pgmap, dev_to_node(adev->dev));
 	if (IS_ERR(r)) {
 		pr_err("failed to register HMM device memory\n");
 
 		/* Disable SVM support capability */
 		pgmap->type = 0;
-		devm_release_mem_region(adev->dev, res->start,
-					res->end - res->start + 1);
+		release_mem_region(res->start, res->end - res->start + 1);
 		return PTR_ERR(r);
 	}
 
@@ -919,7 +918,7 @@ void svm_migrate_fini(struct amdgpu_device *adev)
 	if (!KFD_IS_SVM_API_SUPPORTED(adev->kfd.dev))
 		return;
 
-	devm_memunmap_pages(adev->dev, pgmap);
-	devm_release_mem_region(adev->dev, pgmap->range.start,
-				pgmap->range.end - pgmap->range.start + 1);
+	memunmap_pages(pgmap);
+	release_mem_region(pgmap->range.start,
+			   pgmap->range.end - pgmap->range.start + 1);
 }
-- 
2.17.1