Re: [PATCH 13/26] drm/i915: use the new iterator in i915_gem_busy_ioctl

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On 22/09/2021 15:31, Christian König wrote:
Am 22.09.21 um 12:21 schrieb Tvrtko Ursulin:

On 22/09/2021 10:10, Christian König wrote:
This makes the function much simpler since the complex
retry logic is now handled else where.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
  drivers/gpu/drm/i915/gem/i915_gem_busy.c | 35 ++++++++++--------------
  1 file changed, 14 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_busy.c b/drivers/gpu/drm/i915/gem/i915_gem_busy.c
index 6234e17259c1..313afb4a11c7 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_busy.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_busy.c
@@ -82,8 +82,8 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
  {
      struct drm_i915_gem_busy *args = data;
      struct drm_i915_gem_object *obj;
-    struct dma_resv_list *list;
-    unsigned int seq;
+    struct dma_resv_iter cursor;
+    struct dma_fence *fence;
      int err;
        err = -ENOENT;
@@ -109,27 +109,20 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,        * to report the overall busyness. This is what the wait-ioctl does.
       *
       */
-retry:
-    seq = raw_read_seqcount(&obj->base.resv->seq);
-
-    /* Translate the exclusive fence to the READ *and* WRITE engine */
-    args->busy = busy_check_writer(dma_resv_excl_fence(obj->base.resv));
-
-    /* Translate shared fences to READ set of engines */
-    list = dma_resv_shared_list(obj->base.resv);
-    if (list) {
-        unsigned int shared_count = list->shared_count, i;
-
-        for (i = 0; i < shared_count; ++i) {
-            struct dma_fence *fence =
-                rcu_dereference(list->shared[i]);
-
+    args->busy = false;

You can drop this line, especially since it is not a boolean. With that:

I just realized that this won't work. We still need to initialize the return value when there is no fence at all in the resv object.


Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Does that still counts if I set args->busy to zero?

Ah yes, my bad, apologies. You can keep the r-b.

Regards,

Tvrtko


Thanks,
Christian.


Regards,

Tvrtko

+    dma_resv_iter_begin(&cursor, obj->base.resv, true);
+    dma_resv_for_each_fence_unlocked(&cursor, fence) {
+        if (dma_resv_iter_is_restarted(&cursor))
+            args->busy = 0;
+
+        if (dma_resv_iter_is_exclusive(&cursor))
+            /* Translate the exclusive fence to the READ *and* WRITE engine */
+            args->busy |= busy_check_writer(fence);
+        else
+            /* Translate shared fences to READ set of engines */
              args->busy |= busy_check_reader(fence);
-        }
      }
-
-    if (args->busy && read_seqcount_retry(&obj->base.resv->seq, seq))
-        goto retry;
+    dma_resv_iter_end(&cursor);
        err = 0;
  out:





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