drm/xe: Introduce a new DRM driver for Intel GPUs

Xe, is a new driver for Intel GPUs that supports both integrated and
discrete platforms starting with Tiger Lake (first Intel Xe Architecture).

The code is at a stage where it is already functional and has experimental
support for multiple platforms starting from Tiger Lake, with initial
support implemented in Mesa (for Iris and Anv, our OpenGL and Vulkan
drivers), as well as in NEO (for OpenCL and Level0).

The new Xe driver leverages a lot from i915.

As for display, the intent is to share the display code with the i915
driver so that there is maximum reuse there. But it is not added
in this patch.

This initial work is a collaboration of many people and unfortunately
the big squashed patch won't fully honor the proper credits. But let's
get some git quick stats so we can at least try to preserve some of the
credits:

Co-developed-by: Matthew Brost <matthew.brost@intel.com>
Co-developed-by: Matthew Auld <matthew.auld@intel.com>
Co-developed-by: Matt Roper <matthew.d.roper@intel.com>
Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Co-developed-by: Francois Dugast <francois.dugast@intel.com>
Co-developed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Co-developed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Co-developed-by: Philippe Lecluse <philippe.lecluse@intel.com>
Co-developed-by: Nirmoy Das <nirmoy.das@intel.com>
Co-developed-by: Jani Nikula <jani.nikula@intel.com>
Co-developed-by: José Roberto de Souza <jose.souza@intel.com>
Co-developed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Co-developed-by: Dave Airlie <airlied@redhat.com>
Co-developed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Co-developed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Co-developed-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>

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..0bac1f73a80d
--- /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