drm/amd: Add CGS interfaces

CGS (Common Graphics Services) is an AMD cross component
abstraction layer to designed to better encapsulate
specific IP block drivers so different teams can effectively
work on differnet IP block drivers independently. It provides
a common interface for things like accessing registers,
allocating GPU memory, and registering interrupt sources.
The plan is to eventually move more and more IP drivers to
this interface.  The first user is the ACP IP driver.

Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

5 files changed, 1036 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index 908360584e4d..ccdbb3579bd8 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -77,6 +77,9 @@ amdgpu-y += \
 	 amdgpu_amdkfd_gfx_v7.o \
 	 amdgpu_amdkfd_gfx_v8.o
 
+# add cgs
+amdgpu-y += amdgpu_cgs.o
+
 amdgpu-$(CONFIG_COMPAT) += amdgpu_ioc32.o
 amdgpu-$(CONFIG_VGA_SWITCHEROO) += amdgpu_atpx_handler.o
 amdgpu-$(CONFIG_ACPI) += amdgpu_acpi.o
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index baefa635169a..548e2bb72d99 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -42,6 +42,7 @@
 #include <ttm/ttm_module.h>
 #include <ttm/ttm_execbuf_util.h>
 
+#include <drm/drmP.h>
 #include <drm/drm_gem.h>
 #include <drm/amdgpu_drm.h>
 
@@ -1862,6 +1863,13 @@ extern int amdgpu_ctx_ioctl(struct drm_device *dev, void *data,
 						 struct drm_file *filp);
 
 /*
+ * CGS
+ */
+void *amdgpu_cgs_create_device(struct amdgpu_device *adev);
+void amdgpu_cgs_destroy_device(void *cgs_device);
+
+
+/*
  * Core structure, functions and helpers.
  */
 typedef uint32_t (*amdgpu_rreg_t)(struct amdgpu_device*, uint32_t);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
new file mode 100644
index 000000000000..aea264a15d9b
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
@@ -0,0 +1,327 @@
+/*
+ * Copyright 2015 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 "amdgpu.h"
+#include "cgs_linux.h"
+
+struct amdgpu_cgs_device {
+	struct cgs_device base;
+	struct amdgpu_device *adev;
+};
+
+#define CGS_FUNC_ADEV							\
+	struct amdgpu_device *adev =					\
+		((struct amdgpu_cgs_device *)cgs_device)->adev
+
+static int amdgpu_cgs_gpu_mem_info(void *cgs_device, enum cgs_gpu_mem_type type,
+				   uint64_t *mc_start, uint64_t *mc_size,
+				   uint64_t *mem_size)
+{
+	return 0;
+}
+
+static int amdgpu_cgs_gmap_kmem(void *cgs_device, void *kmem,
+				uint64_t size,
+				uint64_t min_offset, uint64_t max_offset,
+				cgs_handle_t *kmem_handle, uint64_t *mcaddr)
+{
+	return 0;
+}
+
+static int amdgpu_cgs_gunmap_kmem(void *cgs_device, cgs_handle_t kmem_handle)
+{
+	return 0;
+}
+
+static int amdgpu_cgs_alloc_gpu_mem(void *cgs_device,
+				    enum cgs_gpu_mem_type type,
+				    uint64_t size, uint64_t align,
+				    uint64_t min_offset, uint64_t max_offset,
+				    cgs_handle_t *handle)
+{
+	return 0;
+}
+
+static int amdgpu_cgs_import_gpu_mem(void *cgs_device, int dmabuf_fd,
+				     cgs_handle_t *handle)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_free_gpu_mem(void *cgs_device, cgs_handle_t handle)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_gmap_gpu_mem(void *cgs_device, cgs_handle_t handle,
+				   uint64_t *mcaddr)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_gunmap_gpu_mem(void *cgs_device, cgs_handle_t handle)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_kmap_gpu_mem(void *cgs_device, cgs_handle_t handle,
+				   void **map)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_kunmap_gpu_mem(void *cgs_device, cgs_handle_t handle)
+{
+	/* TODO */
+	return 0;
+}
+
+static uint32_t amdgpu_cgs_read_register(void *cgs_device, unsigned offset)
+{
+	/* TODO */
+	return 0;
+}
+
+static void amdgpu_cgs_write_register(void *cgs_device, unsigned offset,
+				      uint32_t value)
+{
+	/* TODO */
+	return;
+}
+
+static uint32_t amdgpu_cgs_read_ind_register(void *cgs_device,
+					     enum cgs_ind_reg space,
+					     unsigned index)
+{
+	/* TODO */
+	return 0;
+}
+
+static void amdgpu_cgs_write_ind_register(void *cgs_device,
+					  enum cgs_ind_reg space,
+					  unsigned index, uint32_t value)
+{
+	/* TODO */
+	return;
+}
+
+static uint8_t amdgpu_cgs_read_pci_config_byte(void *cgs_device, unsigned addr)
+{
+	/* TODO */
+	return 0;
+}
+
+static uint16_t amdgpu_cgs_read_pci_config_word(void *cgs_device, unsigned addr)
+{
+	/* TODO */
+	return 0;
+}
+
+static uint32_t amdgpu_cgs_read_pci_config_dword(void *cgs_device,
+						 unsigned addr)
+{
+	/* TODO */
+	return 0;
+}
+
+static void amdgpu_cgs_write_pci_config_byte(void *cgs_device, unsigned addr,
+					     uint8_t value)
+{
+	/* TODO */
+	return;
+}
+
+static void amdgpu_cgs_write_pci_config_word(void *cgs_device, unsigned addr,
+					     uint16_t value)
+{
+	/* TODO */
+	return;
+}
+
+static void amdgpu_cgs_write_pci_config_dword(void *cgs_device, unsigned addr,
+					      uint32_t value)
+{
+	/* TODO */
+	return;
+}
+
+static const void *amdgpu_cgs_atom_get_data_table(void *cgs_device,
+						  unsigned table, uint16_t *size,
+						  uint8_t *frev, uint8_t *crev)
+{
+	/* TODO */
+	return NULL;
+}
+
+static int amdgpu_cgs_atom_get_cmd_table_revs(void *cgs_device, unsigned table,
+					      uint8_t *frev, uint8_t *crev)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_atom_exec_cmd_table(void *cgs_device, unsigned table,
+					  void *args)
+{
+	/* TODO */
+	return 0;
+}
+
+
+static int amdgpu_cgs_create_pm_request(void *cgs_device, cgs_handle_t *request)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_destroy_pm_request(void *cgs_device, cgs_handle_t request)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_set_pm_request(void *cgs_device, cgs_handle_t request,
+				     int active)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_pm_request_clock(void *cgs_device, cgs_handle_t request,
+				       enum cgs_clock clock, unsigned freq)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_pm_request_engine(void *cgs_device, cgs_handle_t request,
+					enum cgs_engine engine, int powered)
+{
+	/* TODO */
+	return 0;
+}
+
+
+
+static int amdgpu_cgs_pm_query_clock_limits(void *cgs_device,
+					    enum cgs_clock clock,
+					    struct cgs_clock_limits *limits)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_set_camera_voltages(void *cgs_device, uint32_t mask,
+					  const uint32_t *voltages)
+{
+	DRM_ERROR("not implemented");
+	return -EPERM;
+}
+
+static int amdgpu_cgs_add_irq_source(void *cgs_device, unsigned src_id,
+				     unsigned num_types,
+				     cgs_irq_source_set_func_t set,
+				     cgs_irq_handler_func_t handler,
+				     void *private_data)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_irq_get(void *cgs_device, unsigned src_id, unsigned type)
+{
+	/* TODO */
+	return 0;
+}
+
+static int amdgpu_cgs_irq_put(void *cgs_device, unsigned src_id, unsigned type)
+{
+	/* TODO */
+	return 0;
+}
+
+static const struct cgs_ops amdgpu_cgs_ops = {
+	amdgpu_cgs_gpu_mem_info,
+	amdgpu_cgs_gmap_kmem,
+	amdgpu_cgs_gunmap_kmem,
+	amdgpu_cgs_alloc_gpu_mem,
+	amdgpu_cgs_free_gpu_mem,
+	amdgpu_cgs_gmap_gpu_mem,
+	amdgpu_cgs_gunmap_gpu_mem,
+	amdgpu_cgs_kmap_gpu_mem,
+	amdgpu_cgs_kunmap_gpu_mem,
+	amdgpu_cgs_read_register,
+	amdgpu_cgs_write_register,
+	amdgpu_cgs_read_ind_register,
+	amdgpu_cgs_write_ind_register,
+	amdgpu_cgs_read_pci_config_byte,
+	amdgpu_cgs_read_pci_config_word,
+	amdgpu_cgs_read_pci_config_dword,
+	amdgpu_cgs_write_pci_config_byte,
+	amdgpu_cgs_write_pci_config_word,
+	amdgpu_cgs_write_pci_config_dword,
+	amdgpu_cgs_atom_get_data_table,
+	amdgpu_cgs_atom_get_cmd_table_revs,
+	amdgpu_cgs_atom_exec_cmd_table,
+	amdgpu_cgs_create_pm_request,
+	amdgpu_cgs_destroy_pm_request,
+	amdgpu_cgs_set_pm_request,
+	amdgpu_cgs_pm_request_clock,
+	amdgpu_cgs_pm_request_engine,
+	amdgpu_cgs_pm_query_clock_limits,
+	amdgpu_cgs_set_camera_voltages
+};
+
+static const struct cgs_os_ops amdgpu_cgs_os_ops = {
+	amdgpu_cgs_import_gpu_mem,
+	amdgpu_cgs_add_irq_source,
+	amdgpu_cgs_irq_get,
+	amdgpu_cgs_irq_put
+};
+
+void *amdgpu_cgs_create_device(struct amdgpu_device *adev)
+{
+	struct amdgpu_cgs_device *cgs_device =
+		kmalloc(sizeof(*cgs_device), GFP_KERNEL);
+
+	if (!cgs_device) {
+		DRM_ERROR("Couldn't allocate CGS device structure\n");
+		return NULL;
+	}
+
+	cgs_device->base.ops = &amdgpu_cgs_ops;
+	cgs_device->base.os_ops = &amdgpu_cgs_os_ops;
+	cgs_device->adev = adev;
+
+	return cgs_device;
+}
+
+void amdgpu_cgs_destroy_device(void *cgs_device)
+{
+	kfree(cgs_device);
+}
diff --git a/drivers/gpu/drm/amd/include/cgs_common.h b/drivers/gpu/drm/amd/include/cgs_common.h
new file mode 100644
index 000000000000..f8cdb8875d89
--- /dev/null
+++ b/drivers/gpu/drm/amd/include/cgs_common.h
@@ -0,0 +1,563 @@
+/*
+ * Copyright 2015 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.
+ *
+ *
+ */
+#ifndef _CGS_COMMON_H
+#define _CGS_COMMON_H
+
+/**
+ * enum cgs_gpu_mem_type - GPU memory types
+ */
+enum cgs_gpu_mem_type {
+	CGS_GPU_MEM_TYPE__VISIBLE_FB,
+	CGS_GPU_MEM_TYPE__INVISIBLE_FB,
+	CGS_GPU_MEM_TYPE__VISIBLE_CONTIG_FB,
+	CGS_GPU_MEM_TYPE__INVISIBLE_CONTIG_FB,
+	CGS_GPU_MEM_TYPE__GART_CACHEABLE,
+	CGS_GPU_MEM_TYPE__GART_WRITECOMBINE
+};
+
+/**
+ * enum cgs_ind_reg - Indirect register spaces
+ */
+enum cgs_ind_reg {
+	CGS_IND_REG__MMIO,
+	CGS_IND_REG__PCIE,
+	CGS_IND_REG__SMC,
+	CGS_IND_REG__UVD_CTX,
+	CGS_IND_REG__DIDT,
+	CGS_IND_REG__AUDIO_ENDPT
+};
+
+/**
+ * enum cgs_clock - Clocks controlled by the SMU
+ */
+enum cgs_clock {
+	CGS_CLOCK__SCLK,
+	CGS_CLOCK__MCLK,
+	CGS_CLOCK__VCLK,
+	CGS_CLOCK__DCLK,
+	CGS_CLOCK__ECLK,
+	CGS_CLOCK__ACLK,
+	CGS_CLOCK__ICLK,
+	/* ... */
+};
+
+/**
+ * enum cgs_engine - Engines that can be statically power-gated
+ */
+enum cgs_engine {
+	CGS_ENGINE__UVD,
+	CGS_ENGINE__VCE,
+	CGS_ENGINE__VP8,
+	CGS_ENGINE__ACP_DMA,
+	CGS_ENGINE__ACP_DSP0,
+	CGS_ENGINE__ACP_DSP1,
+	CGS_ENGINE__ISP,
+	/* ... */
+};
+
+/**
+ * enum cgs_voltage_planes - Voltage planes for external camera HW
+ */
+enum cgs_voltage_planes {
+	CGS_VOLTAGE_PLANE__SENSOR0,
+	CGS_VOLTAGE_PLANE__SENSOR1,
+	/* ... */
+};
+
+/**
+ * struct cgs_clock_limits - Clock limits
+ *
+ * Clocks are specified in 10KHz units.
+ */
+struct cgs_clock_limits {
+	unsigned min;		/**< Minimum supported frequency */
+	unsigned max;		/**< Maxumim supported frequency */
+	unsigned sustainable;	/**< Thermally sustainable frequency */
+};
+
+typedef unsigned long cgs_handle_t;
+
+/**
+ * cgs_gpu_mem_info() - Return information about memory heaps
+ * @cgs_device: opaque device handle
+ * @type:	memory type
+ * @mc_start:	Start MC address of the heap (output)
+ * @mc_size:	MC address space size (output)
+ * @mem_size:	maximum amount of memory available for allocation (output)
+ *
+ * This function returns information about memory heaps. The type
+ * parameter is used to select the memory heap. The mc_start and
+ * mc_size for GART heaps may be bigger than the memory available for
+ * allocation.
+ *
+ * mc_start and mc_size are undefined for non-contiguous FB memory
+ * types, since buffers allocated with these types may or may not be
+ * GART mapped.
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_gpu_mem_info_t)(void *cgs_device, enum cgs_gpu_mem_type type,
+				  uint64_t *mc_start, uint64_t *mc_size,
+				  uint64_t *mem_size);
+
+/**
+ * cgs_gmap_kmem() - map kernel memory to GART aperture
+ * @cgs_device:	opaque device handle
+ * @kmem:	pointer to kernel memory
+ * @size:	size to map
+ * @min_offset: minimum offset from start of GART aperture
+ * @max_offset: maximum offset from start of GART aperture
+ * @kmem_handle: kernel memory handle (output)
+ * @mcaddr:	MC address (output)
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_gmap_kmem_t)(void *cgs_device, void *kmem, uint64_t size,
+			       uint64_t min_offset, uint64_t max_offset,
+			       cgs_handle_t *kmem_handle, uint64_t *mcaddr);
+
+/**
+ * cgs_gunmap_kmem() - unmap kernel memory
+ * @cgs_device:	opaque device handle
+ * @kmem_handle: kernel memory handle returned by gmap_kmem
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_gunmap_kmem_t)(void *cgs_device, cgs_handle_t kmem_handle);
+
+/**
+ * cgs_alloc_gpu_mem() - Allocate GPU memory
+ * @cgs_device:	opaque device handle
+ * @type:	memory type
+ * @size:	size in bytes
+ * @align:	alignment in bytes
+ * @min_offset: minimum offset from start of heap
+ * @max_offset: maximum offset from start of heap
+ * @handle:	memory handle (output)
+ *
+ * The memory types CGS_GPU_MEM_TYPE_*_CONTIG_FB force contiguous
+ * memory allocation. This guarantees that the MC address returned by
+ * cgs_gmap_gpu_mem is not mapped through the GART. The non-contiguous
+ * FB memory types may be GART mapped depending on memory
+ * fragmentation and memory allocator policies.
+ *
+ * If min/max_offset are non-0, the allocation will be forced to
+ * reside between these offsets in its respective memory heap. The
+ * base address that the offset relates to, depends on the memory
+ * type.
+ *
+ * - CGS_GPU_MEM_TYPE__*_CONTIG_FB: FB MC base address
+ * - CGS_GPU_MEM_TYPE__GART_*:	    GART aperture base address
+ * - others:			    undefined, don't use with max_offset
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_alloc_gpu_mem_t)(void *cgs_device, enum cgs_gpu_mem_type type,
+				   uint64_t size, uint64_t align,
+				   uint64_t min_offset, uint64_t max_offset,
+				   cgs_handle_t *handle);
+
+/**
+ * cgs_free_gpu_mem() - Free GPU memory
+ * @cgs_device:	opaque device handle
+ * @handle:	memory handle returned by alloc or import
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_free_gpu_mem_t)(void *cgs_device, cgs_handle_t handle);
+
+/**
+ * cgs_gmap_gpu_mem() - GPU-map GPU memory
+ * @cgs_device:	opaque device handle
+ * @handle:	memory handle returned by alloc or import
+ * @mcaddr:	MC address (output)
+ *
+ * Ensures that a buffer is GPU accessible and returns its MC address.
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_gmap_gpu_mem_t)(void *cgs_device, cgs_handle_t handle,
+				  uint64_t *mcaddr);
+
+/**
+ * cgs_gunmap_gpu_mem() - GPU-unmap GPU memory
+ * @cgs_device:	opaque device handle
+ * @handle:	memory handle returned by alloc or import
+ *
+ * Allows the buffer to be migrated while it's not used by the GPU.
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_gunmap_gpu_mem_t)(void *cgs_device, cgs_handle_t handle);
+
+/**
+ * cgs_kmap_gpu_mem() - Kernel-map GPU memory
+ *
+ * @cgs_device:	opaque device handle
+ * @handle:	memory handle returned by alloc or import
+ * @map:	Kernel virtual address the memory was mapped to (output)
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_kmap_gpu_mem_t)(void *cgs_device, cgs_handle_t handle,
+				  void **map);
+
+/**
+ * cgs_kunmap_gpu_mem() - Kernel-unmap GPU memory
+ * @cgs_device:	opaque device handle
+ * @handle:	memory handle returned by alloc or import
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_kunmap_gpu_mem_t)(void *cgs_device, cgs_handle_t handle);
+
+/**
+ * cgs_read_register() - Read an MMIO register
+ * @cgs_device:	opaque device handle
+ * @offset:	register offset
+ *
+ * Return:  register value
+ */
+typedef uint32_t (*cgs_read_register_t)(void *cgs_device, unsigned offset);
+
+/**
+ * cgs_write_register() - Write an MMIO register
+ * @cgs_device:	opaque device handle
+ * @offset:	register offset
+ * @value:	register value
+ */
+typedef void (*cgs_write_register_t)(void *cgs_device, unsigned offset,
+				     uint32_t value);
+
+/**
+ * cgs_read_ind_register() - Read an indirect register
+ * @cgs_device:	opaque device handle
+ * @offset:	register offset
+ *
+ * Return:  register value
+ */
+typedef uint32_t (*cgs_read_ind_register_t)(void *cgs_device, enum cgs_ind_reg space,
+					    unsigned index);
+
+/**
+ * cgs_write_ind_register() - Write an indirect register
+ * @cgs_device:	opaque device handle
+ * @offset:	register offset
+ * @value:	register value
+ */
+typedef void (*cgs_write_ind_register_t)(void *cgs_device, enum cgs_ind_reg space,
+					 unsigned index, uint32_t value);
+
+/**
+ * cgs_read_pci_config_byte() - Read byte from PCI configuration space
+ * @cgs_device:	opaque device handle
+ * @addr:	address
+ *
+ * Return:  Value read
+ */
+typedef uint8_t (*cgs_read_pci_config_byte_t)(void *cgs_device, unsigned addr);
+
+/**
+ * cgs_read_pci_config_word() - Read word from PCI configuration space
+ * @cgs_device:	opaque device handle
+ * @addr:	address, must be word-aligned
+ *
+ * Return:  Value read
+ */
+typedef uint16_t (*cgs_read_pci_config_word_t)(void *cgs_device, unsigned addr);
+
+/**
+ * cgs_read_pci_config_dword() - Read dword from PCI configuration space
+ * @cgs_device:	opaque device handle
+ * @addr:	address, must be dword-aligned
+ *
+ * Return:  Value read
+ */
+typedef uint32_t (*cgs_read_pci_config_dword_t)(void *cgs_device,
+						unsigned addr);
+
+/**
+ * cgs_write_pci_config_byte() - Write byte to PCI configuration space
+ * @cgs_device:	opaque device handle
+ * @addr:	address
+ * @value:	value to write
+ */
+typedef void (*cgs_write_pci_config_byte_t)(void *cgs_device, unsigned addr,
+					    uint8_t value);
+
+/**
+ * cgs_write_pci_config_word() - Write byte to PCI configuration space
+ * @cgs_device:	opaque device handle
+ * @addr:	address, must be word-aligned
+ * @value:	value to write
+ */
+typedef void (*cgs_write_pci_config_word_t)(void *cgs_device, unsigned addr,
+					    uint16_t value);
+
+/**
+ * cgs_write_pci_config_dword() - Write byte to PCI configuration space
+ * @cgs_device:	opaque device handle
+ * @addr:	address, must be dword-aligned
+ * @value:	value to write
+ */
+typedef void (*cgs_write_pci_config_dword_t)(void *cgs_device, unsigned addr,
+					     uint32_t value);
+
+/**
+ * cgs_atom_get_data_table() - Get a pointer to an ATOM BIOS data table
+ * @cgs_device:	opaque device handle
+ * @table:	data table index
+ * @size:	size of the table (output, may be NULL)
+ * @frev:	table format revision (output, may be NULL)
+ * @crev:	table content revision (output, may be NULL)
+ *
+ * Return: Pointer to start of the table, or NULL on failure
+ */
+typedef const void *(*cgs_atom_get_data_table_t)(
+	void *cgs_device, unsigned table,
+	uint16_t *size, uint8_t *frev, uint8_t *crev);
+
+/**
+ * cgs_atom_get_cmd_table_revs() - Get ATOM BIOS command table revisions
+ * @cgs_device:	opaque device handle
+ * @table:	data table index
+ * @frev:	table format revision (output, may be NULL)
+ * @crev:	table content revision (output, may be NULL)
+ *
+ * Return: 0 on success, -errno otherwise
+ */
+typedef int (*cgs_atom_get_cmd_table_revs_t)(void *cgs_device, unsigned table,
+					     uint8_t *frev, uint8_t *crev);
+
+/**
+ * cgs_atom_exec_cmd_table() - Execute an ATOM BIOS command table
+ * @cgs_device: opaque device handle
+ * @table:	command table index
+ * @args:	arguments
+ *
+ * Return: 0 on success, -errno otherwise
+ */
+typedef int (*cgs_atom_exec_cmd_table_t)(void *cgs_device,
+					 unsigned table, void *args);
+
+/**
+ * cgs_create_pm_request() - Create a power management request
+ * @cgs_device:	opaque device handle
+ * @request:	handle of created PM request (output)
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_create_pm_request_t)(void *cgs_device, cgs_handle_t *request);
+
+/**
+ * cgs_destroy_pm_request() - Destroy a power management request
+ * @cgs_device:	opaque device handle
+ * @request:	handle of created PM request
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_destroy_pm_request_t)(void *cgs_device, cgs_handle_t request);
+
+/**
+ * cgs_set_pm_request() - Activate or deactiveate a PM request
+ * @cgs_device:	opaque device handle
+ * @request:	PM request handle
+ * @active:	0 = deactivate, non-0 = activate
+ *
+ * While a PM request is active, its minimum clock requests are taken
+ * into account as the requested engines are powered up. When the
+ * request is inactive, the engines may be powered down and clocks may
+ * be lower, depending on other PM requests by other driver
+ * components.
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_set_pm_request_t)(void *cgs_device, cgs_handle_t request,
+				    int active);
+
+/**
+ * cgs_pm_request_clock() - Request a minimum frequency for a specific clock
+ * @cgs_device:	opaque device handle
+ * @request:	PM request handle
+ * @clock:	which clock?
+ * @freq:	requested min. frequency in 10KHz units (0 to clear request)
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_pm_request_clock_t)(void *cgs_device, cgs_handle_t request,
+				      enum cgs_clock clock, unsigned freq);
+
+/**
+ * cgs_pm_request_engine() - Request an engine to be powered up
+ * @cgs_device:	opaque device handle
+ * @request:	PM request handle
+ * @engine:	which engine?
+ * @powered:	0 = powered down, non-0 = powered up
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_pm_request_engine_t)(void *cgs_device, cgs_handle_t request,
+				       enum cgs_engine engine, int powered);
+
+/**
+ * cgs_pm_query_clock_limits() - Query clock frequency limits
+ * @cgs_device:	opaque device handle
+ * @clock:	which clock?
+ * @limits:	clock limits
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_pm_query_clock_limits_t)(void *cgs_device,
+					   enum cgs_clock clock,
+					   struct cgs_clock_limits *limits);
+
+/**
+ * cgs_set_camera_voltages() - Apply specific voltages to PMIC voltage planes
+ * @cgs_device:	opaque device handle
+ * @mask:	bitmask of voltages to change (1<<CGS_VOLTAGE_PLANE__xyz|...)
+ * @voltages:	pointer to array of voltage values in 1mV units
+ *
+ * Return: 0 on success, -errno otherwise
+ */
+typedef int (*cgs_set_camera_voltages_t)(void *cgs_device, uint32_t mask,
+					 const uint32_t *voltages);
+
+struct cgs_ops {
+	/* memory management calls (similar to KFD interface) */
+	cgs_gpu_mem_info_t gpu_mem_info;
+	cgs_gmap_kmem_t gmap_kmem;
+	cgs_gunmap_kmem_t gunmap_kmem;
+	cgs_alloc_gpu_mem_t alloc_gpu_mem;
+	cgs_free_gpu_mem_t free_gpu_mem;
+	cgs_gmap_gpu_mem_t gmap_gpu_mem;
+	cgs_gunmap_gpu_mem_t gunmap_gpu_mem;
+	cgs_kmap_gpu_mem_t kmap_gpu_mem;
+	cgs_kunmap_gpu_mem_t kunmap_gpu_mem;
+	/* MMIO access */
+	cgs_read_register_t read_register;
+	cgs_write_register_t write_register;
+	cgs_read_ind_register_t read_ind_register;
+	cgs_write_ind_register_t write_ind_register;
+	/* PCI configuration space access */
+	cgs_read_pci_config_byte_t read_pci_config_byte;
+	cgs_read_pci_config_word_t read_pci_config_word;
+	cgs_read_pci_config_dword_t read_pci_config_dword;
+	cgs_write_pci_config_byte_t write_pci_config_byte;
+	cgs_write_pci_config_word_t write_pci_config_word;
+	cgs_write_pci_config_dword_t write_pci_config_dword;
+	/* ATOM BIOS */
+	cgs_atom_get_data_table_t atom_get_data_table;
+	cgs_atom_get_cmd_table_revs_t atom_get_cmd_table_revs;
+	cgs_atom_exec_cmd_table_t atom_exec_cmd_table;
+	/* Power management */
+	cgs_create_pm_request_t create_pm_request;
+	cgs_destroy_pm_request_t destroy_pm_request;
+	cgs_set_pm_request_t set_pm_request;
+	cgs_pm_request_clock_t pm_request_clock;
+	cgs_pm_request_engine_t pm_request_engine;
+	cgs_pm_query_clock_limits_t pm_query_clock_limits;
+	cgs_set_camera_voltages_t set_camera_voltages;
+	/* ACPI (TODO) */
+};
+
+struct cgs_os_ops; /* To be define in OS-specific CGS header */
+
+struct cgs_device
+{
+	const struct cgs_ops *ops;
+	const struct cgs_os_ops *os_ops;
+	/* to be embedded at the start of driver private structure */
+};
+
+/* Convenience macros that make CGS indirect function calls look like
+ * normal function calls */
+#define CGS_CALL(func,dev,...) \
+	(((struct cgs_device *)dev)->ops->func(dev, ##__VA_ARGS__))
+#define CGS_OS_CALL(func,dev,...) \
+	(((struct cgs_device *)dev)->os_ops->func(dev, ##__VA_ARGS__))
+
+#define cgs_gpu_mem_info(dev,type,mc_start,mc_size,mem_size)		\
+	CGS_CALL(gpu_mem_info,dev,type,mc_start,mc_size,mem_size)
+#define cgs_gmap_kmem(dev,kmem,size,min_off,max_off,kmem_handle,mcaddr)	\
+	CGS_CALL(gmap_kmem,dev,kmem,size,min_off,max_off,kmem_handle,mcaddr)
+#define cgs_gummap_kmem(dev,kmem_handle)	\
+	CGS_CALL(gunmap_kmem,dev,keme_handle)
+#define cgs_alloc_gpu_mem(dev,type,size,align,min_off,max_off,handle)	\
+	CGS_CALL(alloc_gpu_mem,dev,type,size,align,min_off,max_off,handle)
+#define cgs_free_gpu_mem(dev,handle)		\
+	CGS_CALL(free_gpu_mem,dev,handle)
+#define cgs_gmap_gpu_mem(dev,handle,mcaddr)	\
+	CGS_CALL(gmap_gpu_mem,dev,handle,mcaddr)
+#define cgs_gummap_gpu_mem(dev,handle)		\
+	CGS_CALL(gunmap_gpu_mem,dev,handle)
+#define cgs_kmap_gpu_mem(dev,handle,map)	\
+	CGS_CALL(kmap_gpu_mem,dev,handle,map)
+#define cgs_kunmap_gpu_mem(dev,handle)		\
+	CGS_CALL(kunmap_gpu_mem,dev,handle)
+
+#define cgs_read_register(dev,offset)		\
+	CGS_CALL(read_register,dev,offset)
+#define cgs_write_register(dev,offset,value)		\
+	CGS_CALL(write_register,dev,offset,value)
+#define cgs_read_ind_register(dev,space,index)		\
+	CGS_CALL(read_ind_register,dev,space,index)
+#define cgs_write_ind_register(dev,space,index,value)		\
+	CGS_CALL(write_ind_register,dev,space,index,value)
+
+#define cgs_read_pci_config_byte(dev,addr)	\
+	CGS_CALL(read_pci_config_byte,dev,addr)
+#define cgs_read_pci_config_word(dev,addr)	\
+	CGS_CALL(read_pci_config_word,dev,addr)
+#define cgs_read_pci_config_dword(dev,addr)		\
+	CGS_CALL(read_pci_config_dword,dev,addr)
+#define cgs_write_pci_config_byte(dev,addr,value)	\
+	CGS_CALL(write_pci_config_byte,dev,addr,value)
+#define cgs_write_pci_config_word(dev,addr,value)	\
+	CGS_CALL(write_pci_config_word,dev,addr,value)
+#define cgs_write_pci_config_dword(dev,addr,value)	\
+	CGS_CALL(write_pci_config_dword,dev,addr,value)
+
+#define cgs_atom_get_data_table(dev,table,size,frev,crev)	\
+	CGS_CALL(atom_get_data_table,dev,table,size,frev,crev)
+#define cgs_atom_get_cmd_table_revs(dev,table,frev,crev)	\
+	CGS_CALL(atom_get_cmd_table_revs,dev,table,frev,crev)
+#define cgs_atom_exec_cmd_table(dev,table,args)		\
+	CGS_CALL(atom_exec_cmd_table,dev,table,args)
+
+#define cgs_create_pm_request(dev,request)	\
+	CGS_CALL(create_pm_request,dev,request)
+#define cgs_destroy_pm_request(dev,request)		\
+	CGS_CALL(destroy_pm_request,dev,request)
+#define cgs_set_pm_request(dev,request,active)		\
+	CGS_CALL(set_pm_request,dev,request,active)
+#define cgs_pm_request_clock(dev,request,clock,freq)		\
+	CGS_CALL(pm_request_clock,dev,request,clock,freq)
+#define cgs_pm_request_engine(dev,request,engine,powered)	\
+	CGS_CALL(pm_request_engine,dev,request,engine,powered)
+#define cgs_pm_query_clock_limits(dev,clock,limits)		\
+	CGS_CALL(pm_query_clock_limits,dev,clock,limits)
+#define cgs_set_camera_voltages(dev,mask,voltages)	\
+	CGS_CALL(set_camera_voltages,dev,mask,voltages)
+
+#endif /* _CGS_COMMON_H */
diff --git a/drivers/gpu/drm/amd/include/cgs_linux.h b/drivers/gpu/drm/amd/include/cgs_linux.h
new file mode 100644
index 000000000000..488642f08267
--- /dev/null
+++ b/drivers/gpu/drm/amd/include/cgs_linux.h
@@ -0,0 +1,135 @@
+/*
+ * Copyright 2015 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.
+ *
+ *
+ */
+#ifndef _CGS_LINUX_H
+#define _CGS_LINUX_H
+
+#include "cgs_common.h"
+
+/**
+ * cgs_import_gpu_mem() - Import dmabuf handle
+ * @cgs_device:  opaque device handle
+ * @dmabuf_fd:   DMABuf file descriptor
+ * @handle:      memory handle (output)
+ *
+ * Must be called in the process context that dmabuf_fd belongs to.
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_import_gpu_mem_t)(void *cgs_device, int dmabuf_fd,
+				    cgs_handle_t *handle);
+
+/**
+ * cgs_irq_source_set_func() - Callback for enabling/disabling interrupt sources
+ * @private_data:  private data provided to cgs_add_irq_source
+ * @src_id:        interrupt source ID
+ * @type:          interrupt type
+ * @enabled:       0 = disable source, non-0 = enable source
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_irq_source_set_func_t)(void *private_data,
+					 unsigned src_id, unsigned type,
+					 int enabled);
+
+/**
+ * cgs_irq_handler_func() - Interrupt handler callback
+ * @private_data:  private data provided to cgs_add_irq_source
+ * @src_id:        interrupt source ID
+ * @iv_entry:      pointer to raw ih ring entry
+ *
+ * This callback runs in interrupt context.
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_irq_handler_func_t)(void *private_data,
+				      unsigned src_id, const uint32_t *iv_entry);
+
+/**
+ * cgs_add_irq_source() - Add an IRQ source
+ * @cgs_device:    opaque device handle
+ * @src_id:        interrupt source ID
+ * @num_types:     number of interrupt types that can be independently enabled
+ * @set:           callback function to enable/disable an interrupt type
+ * @handler:       interrupt handler callback
+ * @private_data:  private data to pass to callback functions
+ *
+ * The same IRQ source can be added only once. Adding an IRQ source
+ * indicates ownership of that IRQ source and all its IRQ types.
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_add_irq_source_t)(void *cgs_device, unsigned src_id,
+				    unsigned num_types,
+				    cgs_irq_source_set_func_t set,
+				    cgs_irq_handler_func_t handler,
+				    void *private_data);
+
+/**
+ * cgs_irq_get() - Request enabling an IRQ source and type
+ * @cgs_device:  opaque device handle
+ * @src_id:      interrupt source ID
+ * @type:        interrupt type
+ *
+ * cgs_irq_get and cgs_irq_put calls must be balanced. They count
+ * "references" to IRQ sources.
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_irq_get_t)(void *cgs_device, unsigned src_id, unsigned type);
+
+/**
+ * cgs_irq_put() - Indicate IRQ source is no longer needed
+ * @cgs_device:  opaque device handle
+ * @src_id:      interrupt source ID
+ * @type:        interrupt type
+ *
+ * cgs_irq_get and cgs_irq_put calls must be balanced. They count
+ * "references" to IRQ sources. Even after cgs_irq_put is called, the
+ * IRQ handler may still be called if there are more refecences to
+ * the IRQ source.
+ *
+ * Return:  0 on success, -errno otherwise
+ */
+typedef int (*cgs_irq_put_t)(void *cgs_device, unsigned src_id, unsigned type);
+
+struct cgs_os_ops {
+	cgs_import_gpu_mem_t import_gpu_mem;
+
+	/* IRQ handling */
+	cgs_add_irq_source_t add_irq_source;
+	cgs_irq_get_t irq_get;
+	cgs_irq_put_t irq_put;
+};
+
+#define cgs_import_gpu_mem(dev,dmabuf_fd,handle)		\
+	CGS_OS_CALL(import_gpu_mem,dev,dmabuf_fd,handle)
+#define cgs_add_irq_source(dev,src_id,num_types,set,handler,private_data) \
+	CGS_OS_CALL(add_irq_source,dev,src_id,num_types,set,handler,	\
+		    private_data)
+#define cgs_irq_get(dev,src_id,type)		\
+	CGS_OS_CALL(irq_get,dev,src_id,type)
+#define cgs_irq_put(dev,src_id,type)		\
+	CGS_OS_CALL(irq_put,dev,src_id,type)
+
+#endif /* _CGS_LINUX_H */