vmwgfx: Implement a proper GMR eviction mechanism
Use Ben's new range manager hooks to implement a manager for
GMRs that manages ids rather than ranges.
This means we can use the standard TTM code for binding, unbinding and
eviction.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c b/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
new file mode 100644
index 0000000..ac6e0d1
--- /dev/null
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
@@ -0,0 +1,137 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
+ */
+
+#include "vmwgfx_drv.h"
+#include "ttm/ttm_module.h"
+#include "ttm/ttm_bo_driver.h"
+#include "ttm/ttm_placement.h"
+#include <linux/idr.h>
+#include <linux/spinlock.h>
+#include <linux/kernel.h>
+
+struct vmwgfx_gmrid_man {
+ spinlock_t lock;
+ struct ida gmr_ida;
+ uint32_t max_gmr_ids;
+};
+
+static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
+ struct ttm_buffer_object *bo,
+ struct ttm_placement *placement,
+ struct ttm_mem_reg *mem)
+{
+ struct vmwgfx_gmrid_man *gman =
+ (struct vmwgfx_gmrid_man *)man->priv;
+ int ret;
+ int id;
+
+ mem->mm_node = NULL;
+
+ do {
+ if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0))
+ return -ENOMEM;
+
+ spin_lock(&gman->lock);
+ ret = ida_get_new(&gman->gmr_ida, &id);
+
+ if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
+ ida_remove(&gman->gmr_ida, id);
+ spin_unlock(&gman->lock);
+ return 0;
+ }
+
+ spin_unlock(&gman->lock);
+
+ } while (ret == -EAGAIN);
+
+ if (likely(ret == 0)) {
+ mem->mm_node = gman;
+ mem->start = id;
+ }
+
+ return ret;
+}
+
+static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
+ struct ttm_mem_reg *mem)
+{
+ struct vmwgfx_gmrid_man *gman =
+ (struct vmwgfx_gmrid_man *)man->priv;
+
+ if (mem->mm_node) {
+ spin_lock(&gman->lock);
+ ida_remove(&gman->gmr_ida, mem->start);
+ spin_unlock(&gman->lock);
+ mem->mm_node = NULL;
+ }
+}
+
+static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
+ unsigned long p_size)
+{
+ struct vmwgfx_gmrid_man *gman =
+ kzalloc(sizeof(*gman), GFP_KERNEL);
+
+ if (unlikely(gman == NULL))
+ return -ENOMEM;
+
+ spin_lock_init(&gman->lock);
+ ida_init(&gman->gmr_ida);
+ gman->max_gmr_ids = p_size;
+ man->priv = (void *) gman;
+ return 0;
+}
+
+static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
+{
+ struct vmwgfx_gmrid_man *gman =
+ (struct vmwgfx_gmrid_man *)man->priv;
+
+ if (gman) {
+ ida_destroy(&gman->gmr_ida);
+ kfree(gman);
+ }
+ return 0;
+}
+
+static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
+ const char *prefix)
+{
+ printk(KERN_INFO "%s: No debug info available for the GMR "
+ "id manager.\n", prefix);
+}
+
+const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
+ vmw_gmrid_man_init,
+ vmw_gmrid_man_takedown,
+ vmw_gmrid_man_get_node,
+ vmw_gmrid_man_put_node,
+ vmw_gmrid_man_debug
+};