Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / vmwgfx / vmwgfx_gmrid_manager.c

diff --git a/kernel/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c b/kernel/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
new file mode 100644 (file)
index 0000000..170b61b
--- /dev/null
+++ b/kernel/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
@@ -0,0 +1,172 @@
+/**************************************************************************
+ *
+ * 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 <drm/ttm/ttm_module.h>
+#include <drm/ttm/ttm_bo_driver.h>
+#include <drm/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;
+       uint32_t max_gmr_pages;
+       uint32_t used_gmr_pages;
+};
+
+static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
+                                 struct ttm_buffer_object *bo,
+                                 const struct ttm_place *place,
+                                 struct ttm_mem_reg *mem)
+{
+       struct vmwgfx_gmrid_man *gman =
+               (struct vmwgfx_gmrid_man *)man->priv;
+       int ret = 0;
+       int id;
+
+       mem->mm_node = NULL;
+
+       spin_lock(&gman->lock);
+
+       if (gman->max_gmr_pages > 0) {
+               gman->used_gmr_pages += bo->num_pages;
+               if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
+                       goto out_err_locked;
+       }
+
+       do {
+               spin_unlock(&gman->lock);
+               if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) {
+                       ret = -ENOMEM;
+                       goto out_err;
+               }
+               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);
+                       ret = 0;
+                       goto out_err_locked;
+               }
+       } while (ret == -EAGAIN);
+
+       if (likely(ret == 0)) {
+               mem->mm_node = gman;
+               mem->start = id;
+               mem->num_pages = bo->num_pages;
+       } else
+               goto out_err_locked;
+
+       spin_unlock(&gman->lock);
+       return 0;
+
+out_err:
+       spin_lock(&gman->lock);
+out_err_locked:
+       gman->used_gmr_pages -= bo->num_pages;
+       spin_unlock(&gman->lock);
+       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);
+               gman->used_gmr_pages -= mem->num_pages;
+               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 vmw_private *dev_priv =
+               container_of(man->bdev, struct vmw_private, bdev);
+       struct vmwgfx_gmrid_man *gman =
+               kzalloc(sizeof(*gman), GFP_KERNEL);
+
+       if (unlikely(gman == NULL))
+               return -ENOMEM;
+
+       spin_lock_init(&gman->lock);
+       gman->used_gmr_pages = 0;
+       ida_init(&gman->gmr_ida);
+
+       switch (p_size) {
+       case VMW_PL_GMR:
+               gman->max_gmr_ids = dev_priv->max_gmr_ids;
+               gman->max_gmr_pages = dev_priv->max_gmr_pages;
+               break;
+       case VMW_PL_MOB:
+               gman->max_gmr_ids = VMWGFX_NUM_MOB;
+               gman->max_gmr_pages = dev_priv->max_mob_pages;
+               break;
+       default:
+               BUG();
+       }
+       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
+};