drm/amdkfd: avoid recursive lock in migrations back to RAM

[Why]:
When we call hmm_range_fault to map memory after a migration, we don't
expect memory to be migrated again as a result of hmm_range_fault. The
driver ensures that all memory is in GPU-accessible locations so that
no migration should be needed. However, there is one corner case where
hmm_range_fault can unexpectedly cause a migration from DEVICE_PRIVATE
back to system memory due to a write-fault when a system memory page in
the same range was mapped read-only (e.g. COW). Ranges with individual
pages in different locations are usually the result of failed page
migrations (e.g. page lock contention). The unexpected migration back
to system memory causes a deadlock from recursive locking in our
driver.

[How]:
Creating a task reference new member under svm_range_list struct.
Setting this with "current" reference, right before the hmm_range_fault
is called. This member is checked against "current" reference at
svm_migrate_to_ram callback function. If equal, the migration will be
ignored.

Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
index cc15250..aeade32 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
@@ -861,6 +861,11 @@ static vm_fault_t svm_migrate_to_ram(struct vm_fault *vmf)
                pr_debug("failed find process at fault address 0x%lx\n", addr);
                return VM_FAULT_SIGBUS;
        }
+       if (READ_ONCE(p->svms.faulting_task) == current) {
+               pr_debug("skipping ram migration\n");
+               kfd_unref_process(p);
+               return 0;
+       }
        addr >>= PAGE_SHIFT;
        pr_debug("CPU page fault svms 0x%p address 0x%lx\n", &p->svms, addr);
 

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index 4104b16..98f7503 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -768,6 +768,7 @@ struct svm_range_list {
        atomic_t                        evicted_ranges;
        struct delayed_work             restore_work;
        DECLARE_BITMAP(bitmap_supported, MAX_GPU_INSTANCE);
+       struct task_struct              *faulting_task;
 };
 
 /* Process data */

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index a2000a1..381d8d2 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1496,9 +1496,11 @@ static int svm_range_validate_and_map(struct mm_struct *mm,
 
                next = min(vma->vm_end, end);
                npages = (next - addr) >> PAGE_SHIFT;
+               WRITE_ONCE(p->svms.faulting_task, current);
                r = amdgpu_hmm_range_get_pages(&prange->notifier, mm, NULL,
                                               addr, npages, &hmm_range,
                                               readonly, true, owner);
+               WRITE_ONCE(p->svms.faulting_task, NULL);
                if (r) {
                        pr_debug("failed %d to get svm range pages\n", r);
                        goto unreserve_out;