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drm/amdkfd: Cleanup IO links during KFD device removal

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Currently, the IO-links to the device being removed from topology,
are not cleared. As a result, there would be dangling links left in
the KFD topology. This patch aims to fix the following:
1. Cleanup all IO links to the device being removed.
2. Ensure that node numbering in sysfs and nodes proximity domain
   values are consistent after the device is removed:
   a. Adding a device and removing a GPU device are made mutually
      exclusive.
   b. The global proximity domain counter is no longer required to be
      an atomic counter. A normal 32-bit counter can be used instead.
3. Update generation_count to let user-mode know that topology has
   changed due to device removal.

CC: Shuotao Xu <shuotaoxu@microsoft.com>
Reviewed-by: Shuotao Xu <shuotaoxu@microsoft.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mukul Joshi
2022-04-06 20:07:37 -04:00
committed by Alex Deucher
parent eb85fc2389
commit 46d18d510d
3 changed files with 78 additions and 11 deletions
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2
drivers/gpu/drm/amd/amdkfd/kfd_priv.h
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@@ -1016,6 +1016,8 @@ int kfd_topology_add_device(struct kfd_dev *gpu);
int kfd_topology_remove_device(struct kfd_dev *gpu);
struct kfd_topology_device *kfd_topology_device_by_proximity_domain(
uint32_t proximity_domain);
struct kfd_topology_device *kfd_topology_device_by_proximity_domain_no_lock(
uint32_t proximity_domain);
struct kfd_topology_device *kfd_topology_device_by_id(uint32_t gpu_id);
struct kfd_dev *kfd_device_by_id(uint32_t gpu_id);
struct kfd_dev *kfd_device_by_pci_dev(const struct pci_dev *pdev);