Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 83 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c b/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c
new file mode 100644
index 000000000..15fff4420
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c
@@ -0,0 +1,83 @@
+/*
+ * 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/types.h>
+#include "kfd_priv.h"
+
+static unsigned int pasid_bits = 16;
+static const struct kfd2kgd_calls *kfd2kgd;
+
+bool kfd_set_pasid_limit(unsigned int new_limit)
+{
+	if (new_limit < 2)
+		return false;
+
+	if (new_limit < (1U << pasid_bits)) {
+		if (kfd2kgd)
+			/* We've already allocated user PASIDs, too late to
+			 * change the limit
+			 */
+			return false;
+
+		while (new_limit < (1U << pasid_bits))
+			pasid_bits--;
+	}
+
+	return true;
+}
+
+unsigned int kfd_get_pasid_limit(void)
+{
+	return 1U << pasid_bits;
+}
+
+unsigned int kfd_pasid_alloc(void)
+{
+	int r;
+
+	/* Find the first best KFD device for calling KGD */
+	if (!kfd2kgd) {
+		struct kfd_dev *dev = NULL;
+		unsigned int i = 0;
+
+		while ((kfd_topology_enum_kfd_devices(i, &dev)) == 0) {
+			if (dev && dev->kfd2kgd) {
+				kfd2kgd = dev->kfd2kgd;
+				break;
+			}
+			i++;
+		}
+
+		if (!kfd2kgd)
+			return false;
+	}
+
+	r = kfd2kgd->alloc_pasid(pasid_bits);
+
+	return r > 0 ? r : 0;
+}
+
+void kfd_pasid_free(unsigned int pasid)
+{
+	if (kfd2kgd)
+		kfd2kgd->free_pasid(pasid);
+}