gallium/pb_slab: use simple_mtx_t

Acked-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13152>

src/gallium/auxiliary/pipebuffer/pb_slab.c

@@ -120,7 +120,7 @@ pb_slab_alloc(struct pb_slabs *slabs, unsigned size, unsigned heap)
                  (1 + slabs->allow_three_fourths_allocations) + three_fourths;
    group = &slabs->groups[group_index];
 
-   mtx_lock(&slabs->mutex);
+   simple_mtx_lock(&slabs->mutex);
 
    /* If there is no candidate slab at all, or the first slab has no free
     * entries, try reclaiming entries.
@@ -146,11 +146,11 @@ pb_slab_alloc(struct pb_slabs *slabs, unsigned size, unsigned heap)
        * There's a chance that racing threads will end up allocating multiple
        * slabs for the same group, but that doesn't hurt correctness.
        */
-      mtx_unlock(&slabs->mutex);
+      simple_mtx_unlock(&slabs->mutex);
       slab = slabs->slab_alloc(slabs->priv, heap, entry_size, group_index);
       if (!slab)
          return NULL;
-      mtx_lock(&slabs->mutex);
+      simple_mtx_lock(&slabs->mutex);
 
       list_add(&slab->head, &group->slabs);
    }
@@ -159,7 +159,7 @@ pb_slab_alloc(struct pb_slabs *slabs, unsigned size, unsigned heap)
    list_del(&entry->head);
    slab->num_free--;
 
-   mtx_unlock(&slabs->mutex);
+   simple_mtx_unlock(&slabs->mutex);
 
    return entry;
 }
@@ -173,9 +173,9 @@ pb_slab_alloc(struct pb_slabs *slabs, unsigned size, unsigned heap)
 void
 pb_slab_free(struct pb_slabs* slabs, struct pb_slab_entry *entry)
 {
-   mtx_lock(&slabs->mutex);
+   simple_mtx_lock(&slabs->mutex);
    list_addtail(&entry->head, &slabs->reclaim);
-   mtx_unlock(&slabs->mutex);
+   simple_mtx_unlock(&slabs->mutex);
 }
 
 /* Check if any of the entries handed to pb_slab_free are ready to be re-used.
@@ -187,9 +187,9 @@ pb_slab_free(struct pb_slabs* slabs, struct pb_slab_entry *entry)
 void
 pb_slabs_reclaim(struct pb_slabs *slabs)
 {
-   mtx_lock(&slabs->mutex);
+   simple_mtx_lock(&slabs->mutex);
    pb_slabs_reclaim_locked(slabs);
-   mtx_unlock(&slabs->mutex);
+   simple_mtx_unlock(&slabs->mutex);
 }
 
 /* Initialize the slabs manager.
@@ -237,7 +237,7 @@ pb_slabs_init(struct pb_slabs *slabs,
       list_inithead(&group->slabs);
    }
 
-   (void) mtx_init(&slabs->mutex, mtx_plain);
+   (void) simple_mtx_init(&slabs->mutex, mtx_plain);
 
    return true;
 }
@@ -261,5 +261,5 @@ pb_slabs_deinit(struct pb_slabs *slabs)
    }
 
    FREE(slabs->groups);
-   mtx_destroy(&slabs->mutex);
+   simple_mtx_destroy(&slabs->mutex);
 }

src/gallium/auxiliary/pipebuffer/pb_slab.h

@@ -45,6 +45,7 @@
 #define PB_SLAB_H
 
 #include "pb_buffer.h"
+#include "util/simple_mtx.h"
 #include "util/list.h"
 #include "os/os_thread.h"
 
@@ -111,7 +112,7 @@ typedef bool (slab_can_reclaim_fn)(void *priv, struct pb_slab_entry *);
  */
 struct pb_slabs
 {
-   mtx_t mutex;
+   simple_mtx_t mutex;
 
    unsigned min_order;
    unsigned num_orders;