1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_map.h b/drivers/gpu/drm/xe/xe_map.h
new file mode 100644
index 000000000000..f62e0c8b67ab
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_map.h
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#ifndef _XE_MAP_H_
+#define _XE_MAP_H_
+
+#include <linux/iosys-map.h>
+
+#include <xe_device.h>
+
+/**
+ * DOC: Map layer
+ *
+ * All access to any memory shared with a device (both sysmem and vram) in the
+ * XE driver should go through this layer (xe_map). This layer is built on top
+ * of :ref:`driver-api/device-io:Generalizing Access to System and I/O Memory`
+ * and with extra hooks into the XE driver that allows adding asserts to memory
+ * accesses (e.g. for blocking runtime_pm D3Cold on Discrete Graphics).
+ */
+
+static inline void xe_map_memcpy_to(struct xe_device *xe, struct iosys_map *dst,
+				    size_t dst_offset, const void *src,
+				    size_t len)
+{
+	xe_device_assert_mem_access(xe);
+	iosys_map_memcpy_to(dst, dst_offset, src, len);
+}
+
+static inline void xe_map_memcpy_from(struct xe_device *xe, void *dst,
+				      const struct iosys_map *src,
+				      size_t src_offset, size_t len)
+{
+	xe_device_assert_mem_access(xe);
+	iosys_map_memcpy_from(dst, src, src_offset, len);
+}
+
+static inline void xe_map_memset(struct xe_device *xe,
+				 struct iosys_map *dst, size_t offset,
+				 int value, size_t len)
+{
+	xe_device_assert_mem_access(xe);
+	iosys_map_memset(dst, offset, value, len);
+}
+
+/* FIXME: We likely should kill these two functions sooner or later */
+static inline u32 xe_map_read32(struct xe_device *xe, struct iosys_map *map)
+{
+	xe_device_assert_mem_access(xe);
+
+	if (map->is_iomem)
+		return readl(map->vaddr_iomem);
+	else
+		return READ_ONCE(*(u32 *)map->vaddr);
+}
+
+static inline void xe_map_write32(struct xe_device *xe, struct iosys_map *map,
+				  u32 val)
+{
+	xe_device_assert_mem_access(xe);
+
+	if (map->is_iomem)
+		writel(val, map->vaddr_iomem);
+	else
+		*(u32 *)map->vaddr = val;
+}
+
+#define xe_map_rd(xe__, map__, offset__, type__) ({			\
+	struct xe_device *__xe = xe__;					\
+	xe_device_assert_mem_access(__xe);				\
+	iosys_map_rd(map__, offset__, type__);				\
+})
+
+#define xe_map_wr(xe__, map__, offset__, type__, val__) ({		\
+	struct xe_device *__xe = xe__;					\
+	xe_device_assert_mem_access(__xe);				\
+	iosys_map_wr(map__, offset__, type__, val__);			\
+})
+
+#define xe_map_rd_field(xe__, map__, struct_offset__, struct_type__, field__) ({	\
+	struct xe_device *__xe = xe__;					\
+	xe_device_assert_mem_access(__xe);				\
+	iosys_map_rd_field(map__, struct_offset__, struct_type__, field__);		\
+})
+
+#define xe_map_wr_field(xe__, map__, struct_offset__, struct_type__, field__, val__) ({	\
+	struct xe_device *__xe = xe__;					\
+	xe_device_assert_mem_access(__xe);				\
+	iosys_map_wr_field(map__, struct_offset__, struct_type__, field__, val__);	\
+})
+
+#endif