drm/amdgpu: Move fault hash table to amdgpu vm

In stead of share one fault hash table per device, make it
per vm. This can avoid inter-process lock issue when fault
hash table is full.

Change-Id: I5d1281b7c41eddc8e26113e010516557588d3708
Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
Suggested-by: Christian Konig <Christian.Koenig@amd.com>
Suggested-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian Konig <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 0 insertions, 75 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
index 06373d44b3da..4ed86218cef3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
@@ -197,78 +197,3 @@ restart_ih:
         return IRQ_HANDLED;
 }
 
-/**
- * amdgpu_ih_add_fault - Add a page fault record
- *
- * @adev: amdgpu device pointer
- * @key: 64-bit encoding of PASID and address
- *
- * This should be called when a retry page fault interrupt is
- * received. If this is a new page fault, it will be added to a hash
- * table. The return value indicates whether this is a new fault, or
- * a fault that was already known and is already being handled.
- *
- * If there are too many pending page faults, this will fail. Retry
- * interrupts should be ignored in this case until there is enough
- * free space.
- *
- * Returns 0 if the fault was added, 1 if the fault was already known,
- * -ENOSPC if there are too many pending faults.
- */
-int amdgpu_ih_add_fault(struct amdgpu_device *adev, u64 key)
-{
-        unsigned long flags;
-        int r = -ENOSPC;
-
-        if (WARN_ON_ONCE(!adev->irq.ih.faults))
-                /* Should be allocated in <IP>_ih_sw_init on GPUs that
-                 * support retry faults and require retry filtering.
-                 */
-                return r;
-
-        spin_lock_irqsave(&adev->irq.ih.faults->lock, flags);
-
-        /* Only let the hash table fill up to 50% for best performance */
-        if (adev->irq.ih.faults->count >= (1 << (AMDGPU_PAGEFAULT_HASH_BITS-1)))
-                goto unlock_out;
-
-        r = chash_table_copy_in(&adev->irq.ih.faults->hash, key, NULL);
-        if (!r)
-                adev->irq.ih.faults->count++;
-
-        /* chash_table_copy_in should never fail unless we're losing count */
-        WARN_ON_ONCE(r < 0);
-
-unlock_out:
-        spin_unlock_irqrestore(&adev->irq.ih.faults->lock, flags);
-        return r;
-}
-
-/**
- * amdgpu_ih_clear_fault - Remove a page fault record
- *
- * @adev: amdgpu device pointer
- * @key: 64-bit encoding of PASID and address
- *
- * This should be called when a page fault has been handled. Any
- * future interrupt with this key will be processed as a new
- * page fault.
- */
-void amdgpu_ih_clear_fault(struct amdgpu_device *adev, u64 key)
-{
-        unsigned long flags;
-        int r;
-
-        if (!adev->irq.ih.faults)
-                return;
-
-        spin_lock_irqsave(&adev->irq.ih.faults->lock, flags);
-
-        r = chash_table_remove(&adev->irq.ih.faults->hash, key, NULL);
-        if (!WARN_ON_ONCE(r < 0)) {
-                adev->irq.ih.faults->count--;
-                WARN_ON_ONCE(adev->irq.ih.faults->count < 0);
-        }
-
-        spin_unlock_irqrestore(&adev->irq.ih.faults->lock, flags);
-}