Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / amd / amdkfd / kfd_pasid.c

diff --git a/kernel/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c b/kernel/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c
new file mode 100644 (file)
index 0000000..6cfe7f1
--- /dev/null
+++ b/kernel/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2014 Advanced Micro Devices, Inc.
+ *
+ * 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, sublicense,
+ * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
+ */
+
+#include <linux/slab.h>
+#include <linux/types.h>
+#include "kfd_priv.h"
+
+static unsigned long *pasid_bitmap;
+static unsigned int pasid_limit;
+static DEFINE_MUTEX(pasid_mutex);
+
+int kfd_pasid_init(void)
+{
+       pasid_limit = KFD_MAX_NUM_OF_PROCESSES;
+
+       pasid_bitmap = kcalloc(BITS_TO_LONGS(pasid_limit), sizeof(long), GFP_KERNEL);
+       if (!pasid_bitmap)
+               return -ENOMEM;
+
+       set_bit(0, pasid_bitmap); /* PASID 0 is reserved. */
+
+       return 0;
+}
+
+void kfd_pasid_exit(void)
+{
+       kfree(pasid_bitmap);
+}
+
+bool kfd_set_pasid_limit(unsigned int new_limit)
+{
+       if (new_limit < pasid_limit) {
+               bool ok;
+
+               mutex_lock(&pasid_mutex);
+
+               /* ensure that no pasids >= new_limit are in-use */
+               ok = (find_next_bit(pasid_bitmap, pasid_limit, new_limit) ==
+                                                               pasid_limit);
+               if (ok)
+                       pasid_limit = new_limit;
+
+               mutex_unlock(&pasid_mutex);
+
+               return ok;
+       }
+
+       return true;
+}
+
+inline unsigned int kfd_get_pasid_limit(void)
+{
+       return pasid_limit;
+}
+
+unsigned int kfd_pasid_alloc(void)
+{
+       unsigned int found;
+
+       mutex_lock(&pasid_mutex);
+
+       found = find_first_zero_bit(pasid_bitmap, pasid_limit);
+       if (found == pasid_limit)
+               found = 0;
+       else
+               set_bit(found, pasid_bitmap);
+
+       mutex_unlock(&pasid_mutex);
+
+       return found;
+}
+
+void kfd_pasid_free(unsigned int pasid)
+{
+       BUG_ON(pasid == 0 || pasid >= pasid_limit);
+       clear_bit(pasid, pasid_bitmap);
+}