[PATCH 5.14 14/48] drm/amdkfd: fix svm_migrate_fini warning

Greg Kroah-Hartman
2021-10-08T11:37:16Z

From: Philip Yang <Philip.Yang@amd.com>

[ Upstream commit 197ae17722e989942b36e33e044787877f158574 ]

Device manager releases device-specific resources when a driver
disconnects from a device, devm_memunmap_pages and
devm_release_mem_region calls in svm_migrate_fini are redundant.

It causes below warning trace after patch "drm/amdgpu: Split
amdgpu_device_fini into early and late", so remove function
svm_migrate_fini.

BUG: https://gitlab.freedesktop.org/drm/amd/-/issues/1718

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]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/amdkfd/kfd_device.c | 1 -
drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 13 ++++---------
drivers/gpu/drm/amd/amdkfd/kfd_migrate.h | 5 -----
3 files changed, 4 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index 5a872adcfdb9..5ba8a4f35344 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -922,7 +922,6 @@ out:
void kgd2kfd_device_exit(struct kfd_dev *kfd)
{
if (kfd->init_complete) {
- svm_migrate_fini((struct amdgpu_device *)kfd->kgd);
device_queue_manager_uninit(kfd->dqm);
kfd_interrupt_exit(kfd);
kfd_topology_remove_device(kfd);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
index 165e0ebb619d..4a16e3c257b9 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
@@ -891,6 +891,10 @@ 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;
+
+ /* Device manager releases device-specific resources, memory region and
+ * pgmap when driver disconnects from device.
+ */
r = devm_memremap_pages(adev->dev, pgmap);
if (IS_ERR(r)) {
pr_err("failed to register HMM device memory\n");
@@ -911,12 +915,3 @@ int svm_migrate_init(struct amdgpu_device *adev)

return 0;
}
-
-void svm_migrate_fini(struct amdgpu_device *adev)
-{
- struct dev_pagemap *pgmap = &adev->kfd.dev->pgmap;
-
- devm_memunmap_pages(adev->dev, pgmap);
- devm_release_mem_region(adev->dev, pgmap->range.start,
- pgmap->range.end - pgmap->range.start + 1);
-}
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.h b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.h
index 0de76b5d4973..2f5b3394c9ed 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.h
@@ -47,7 +47,6 @@ unsigned long
svm_migrate_addr_to_pfn(struct amdgpu_device *adev, unsigned long addr);

int svm_migrate_init(struct amdgpu_device *adev);
-void svm_migrate_fini(struct amdgpu_device *adev);

#else

@@ -55,10 +54,6 @@ static inline int svm_migrate_init(struct amdgpu_device *adev)
{
return 0;
}
-static inline void svm_migrate_fini(struct amdgpu_device *adev)
-{
- /* empty */
-}

#endif /* IS_ENABLED(CONFIG_HSA_AMD_SVM) */

--
2.33.0