drivers/gpu/drm/i915/gvt/firmware.c - third_party/linux - Git at Google

 /*
  * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
  *
  * 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 (including the next
  * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
  *
  * Authors:
  *    Zhi Wang <zhi.a.wang@intel.com>
  *
  * Contributors:
  *    Changbin Du <changbin.du@intel.com>
  *
  */

 #include <linux/firmware.h>
 #include <linux/crc32.h>

 #include "i915_drv.h"
 #include "gvt.h"
 #include "i915_pvinfo.h"

 #define FIRMWARE_VERSION (0x0)

 struct gvt_firmware_header {
 	u64 magic;
 	u32 crc32;		/* protect the data after this field */
 	u32 version;
 	u64 cfg_space_size;
 	u64 cfg_space_offset;	/* offset in the file */
 	u64 mmio_size;
 	u64 mmio_offset;	/* offset in the file */
 	unsigned char data[1];
 };

 #define dev_to_drm_minor(d) dev_get_drvdata((d))

 static ssize_t
 gvt_firmware_read(struct file *filp, struct kobject *kobj,
 	     struct bin_attribute *attr, char *buf,
 	     loff_t offset, size_t count)
 {
 	memcpy(buf, attr->private + offset, count);
 	return count;
 }

 static struct bin_attribute firmware_attr = {
 	.attr = {.name = "gvt_firmware", .mode = (S_IRUSR)},
 	.read = gvt_firmware_read,
 	.write = NULL,
 	.mmap = NULL,
 };

 static int mmio_snapshot_handler(struct intel_gvt *gvt, u32 offset, void *data)
 {
 	struct drm_i915_private *dev_priv = gvt->dev_priv;

 	*(u32 *)(data + offset) = I915_READ_NOTRACE(_MMIO(offset));
 	return 0;
 }

 static int expose_firmware_sysfs(struct intel_gvt *gvt)
 {
 	struct intel_gvt_device_info *info = &gvt->device_info;
 	struct pci_dev *pdev = gvt->dev_priv->drm.pdev;
 	struct gvt_firmware_header *h;
 	void *firmware;
 	void *p;
 	unsigned long size, crc32_start;
 	int i, ret;

 	size = sizeof(*h) + info->mmio_size + info->cfg_space_size;
 	firmware = vzalloc(size);
 	if (!firmware)
 		return -ENOMEM;

 	h = firmware;

 	h->magic = VGT_MAGIC;
 	h->version = FIRMWARE_VERSION;
 	h->cfg_space_size = info->cfg_space_size;
 	h->cfg_space_offset = offsetof(struct gvt_firmware_header, data);
 	h->mmio_size = info->mmio_size;
 	h->mmio_offset = h->cfg_space_offset + h->cfg_space_size;

 	p = firmware + h->cfg_space_offset;

 	for (i = 0; i < h->cfg_space_size; i += 4)
 		pci_read_config_dword(pdev, i, p + i);

 	memcpy(gvt->firmware.cfg_space, p, info->cfg_space_size);

 	p = firmware + h->mmio_offset;

 	/* Take a snapshot of hw mmio registers. */
 	intel_gvt_for_each_tracked_mmio(gvt, mmio_snapshot_handler, p);

 	memcpy(gvt->firmware.mmio, p, info->mmio_size);

 	crc32_start = offsetof(struct gvt_firmware_header, crc32) + 4;
 	h->crc32 = crc32_le(0, firmware + crc32_start, size - crc32_start);

 	firmware_attr.size = size;
 	firmware_attr.private = firmware;

 	ret = device_create_bin_file(&pdev->dev, &firmware_attr);
 	if (ret) {
 		vfree(firmware);
 		return ret;
 	}
 	return 0;
 }

 static void clean_firmware_sysfs(struct intel_gvt *gvt)
 {
 	struct pci_dev *pdev = gvt->dev_priv->drm.pdev;

 	device_remove_bin_file(&pdev->dev, &firmware_attr);
 	vfree(firmware_attr.private);
 }

 /**
  * intel_gvt_free_firmware - free GVT firmware
  * @gvt: intel gvt device
  *
  */
 void intel_gvt_free_firmware(struct intel_gvt *gvt)
 {
 	if (!gvt->firmware.firmware_loaded)
 		clean_firmware_sysfs(gvt);

 	kfree(gvt->firmware.cfg_space);
 	kfree(gvt->firmware.mmio);
 }

 static int verify_firmware(struct intel_gvt *gvt,
 			   const struct firmware *fw)
 {
 	struct intel_gvt_device_info *info = &gvt->device_info;
 	struct drm_i915_private *dev_priv = gvt->dev_priv;
 	struct pci_dev *pdev = dev_priv->drm.pdev;
 	struct gvt_firmware_header *h;
 	unsigned long id, crc32_start;
 	const void *mem;
 	const char *item;
 	u64 file, request;

 	h = (struct gvt_firmware_header *)fw->data;

 	crc32_start = offsetof(struct gvt_firmware_header, crc32) + 4;
 	mem = fw->data + crc32_start;

 #define VERIFY(s, a, b) do { \
 	item = (s); file = (u64)(a); request = (u64)(b); \
 	if ((a) != (b)) \
 		goto invalid_firmware; \
 } while (0)

 	VERIFY("magic number", h->magic, VGT_MAGIC);
 	VERIFY("version", h->version, FIRMWARE_VERSION);
 	VERIFY("crc32", h->crc32, crc32_le(0, mem, fw->size - crc32_start));
 	VERIFY("cfg space size", h->cfg_space_size, info->cfg_space_size);
 	VERIFY("mmio size", h->mmio_size, info->mmio_size);

 	mem = (fw->data + h->cfg_space_offset);

 	id = *(u16 *)(mem + PCI_VENDOR_ID);
 	VERIFY("vender id", id, pdev->vendor);

 	id = *(u16 *)(mem + PCI_DEVICE_ID);
 	VERIFY("device id", id, pdev->device);

 	id = *(u8 *)(mem + PCI_REVISION_ID);
 	VERIFY("revision id", id, pdev->revision);

 #undef VERIFY
 	return 0;

 invalid_firmware:
 	gvt_dbg_core("Invalid firmware: %s [file] 0x%llx [request] 0x%llx\n",
 		     item, file, request);
 	return -EINVAL;
 }

 #define GVT_FIRMWARE_PATH "i915/gvt"

 /**
  * intel_gvt_load_firmware - load GVT firmware
  * @gvt: intel gvt device
  *
  */
 int intel_gvt_load_firmware(struct intel_gvt *gvt)
 {
 	struct intel_gvt_device_info *info = &gvt->device_info;
 	struct drm_i915_private *dev_priv = gvt->dev_priv;
 	struct pci_dev *pdev = dev_priv->drm.pdev;
 	struct intel_gvt_firmware *firmware = &gvt->firmware;
 	struct gvt_firmware_header *h;
 	const struct firmware *fw;
 	char *path;
 	void *mem;
 	int ret;

 	path = kmalloc(PATH_MAX, GFP_KERNEL);
 	if (!path)
 		return -ENOMEM;

 	mem = kmalloc(info->cfg_space_size, GFP_KERNEL);
 	if (!mem) {
 		kfree(path);
 		return -ENOMEM;
 	}

 	firmware->cfg_space = mem;

 	mem = kmalloc(info->mmio_size, GFP_KERNEL);
 	if (!mem) {
 		kfree(path);
 		kfree(firmware->cfg_space);
 		return -ENOMEM;
 	}

 	firmware->mmio = mem;

 	sprintf(path, "%s/vid_0x%04x_did_0x%04x_rid_0x%02x.golden_hw_state",
 		 GVT_FIRMWARE_PATH, pdev->vendor, pdev->device,
 		 pdev->revision);

 	gvt_dbg_core("request hw state firmware %s...\n", path);

 	ret = request_firmware(&fw, path, &dev_priv->drm.pdev->dev);
 	kfree(path);

 	if (ret)
 		goto expose_firmware;

 	gvt_dbg_core("success.\n");

 	ret = verify_firmware(gvt, fw);
 	if (ret)
 		goto out_free_fw;

 	gvt_dbg_core("verified.\n");

 	h = (struct gvt_firmware_header *)fw->data;

 	memcpy(firmware->cfg_space, fw->data + h->cfg_space_offset,
 	       h->cfg_space_size);
 	memcpy(firmware->mmio, fw->data + h->mmio_offset,
 	       h->mmio_size);

 	release_firmware(fw);
 	firmware->firmware_loaded = true;
 	return 0;

 out_free_fw:
 	release_firmware(fw);
 expose_firmware:
 	expose_firmware_sysfs(gvt);
 	return 0;
 }
	/*
	* Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
	*
	* 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 (including the next
	* paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
	*
	* Authors:
	* Zhi Wang <zhi.a.wang@intel.com>
	*
	* Contributors:
	* Changbin Du <changbin.du@intel.com>
	*
	*/

	#include <linux/firmware.h>
	#include <linux/crc32.h>

	#include "i915_drv.h"
	#include "gvt.h"
	#include "i915_pvinfo.h"

	#define FIRMWARE_VERSION (0x0)

	struct gvt_firmware_header {
	u64 magic;
	u32 crc32; /* protect the data after this field */
	u32 version;
	u64 cfg_space_size;
	u64 cfg_space_offset; /* offset in the file */
	u64 mmio_size;
	u64 mmio_offset; /* offset in the file */
	unsigned char data[1];
	};

	#define dev_to_drm_minor(d) dev_get_drvdata((d))

	static ssize_t
	gvt_firmware_read(struct file filp, struct kobject kobj,
	struct bin_attribute attr, char buf,
	loff_t offset, size_t count)
	{
	memcpy(buf, attr->private + offset, count);
	return count;
	}

	static struct bin_attribute firmware_attr = {
	.attr = {.name = "gvt_firmware", .mode = (S_IRUSR)},
	.read = gvt_firmware_read,
	.write = NULL,
	.mmap = NULL,
	};

	static int mmio_snapshot_handler(struct intel_gvt gvt, u32 offset, void data)
	{
	struct drm_i915_private *dev_priv = gvt->dev_priv;

	(u32 )(data + offset) = I915_READ_NOTRACE(_MMIO(offset));
	return 0;
	}

	static int expose_firmware_sysfs(struct intel_gvt *gvt)
	{
	struct intel_gvt_device_info *info = &gvt->device_info;
	struct pci_dev *pdev = gvt->dev_priv->drm.pdev;
	struct gvt_firmware_header *h;
	void *firmware;
	void *p;
	unsigned long size, crc32_start;
	int i, ret;

	size = sizeof(*h) + info->mmio_size + info->cfg_space_size;
	firmware = vzalloc(size);
	if (!firmware)
	return -ENOMEM;

	h = firmware;

	h->magic = VGT_MAGIC;
	h->version = FIRMWARE_VERSION;
	h->cfg_space_size = info->cfg_space_size;
	h->cfg_space_offset = offsetof(struct gvt_firmware_header, data);
	h->mmio_size = info->mmio_size;
	h->mmio_offset = h->cfg_space_offset + h->cfg_space_size;

	p = firmware + h->cfg_space_offset;

	for (i = 0; i < h->cfg_space_size; i += 4)
	pci_read_config_dword(pdev, i, p + i);

	memcpy(gvt->firmware.cfg_space, p, info->cfg_space_size);

	p = firmware + h->mmio_offset;

	/* Take a snapshot of hw mmio registers. */
	intel_gvt_for_each_tracked_mmio(gvt, mmio_snapshot_handler, p);

	memcpy(gvt->firmware.mmio, p, info->mmio_size);

	crc32_start = offsetof(struct gvt_firmware_header, crc32) + 4;
	h->crc32 = crc32_le(0, firmware + crc32_start, size - crc32_start);

	firmware_attr.size = size;
	firmware_attr.private = firmware;

	ret = device_create_bin_file(&pdev->dev, &firmware_attr);
	if (ret) {
	vfree(firmware);
	return ret;
	}
	return 0;
	}

	static void clean_firmware_sysfs(struct intel_gvt *gvt)
	{
	struct pci_dev *pdev = gvt->dev_priv->drm.pdev;

	device_remove_bin_file(&pdev->dev, &firmware_attr);
	vfree(firmware_attr.private);
	}

	/**
	* intel_gvt_free_firmware - free GVT firmware
	* @gvt: intel gvt device
	*
	*/
	void intel_gvt_free_firmware(struct intel_gvt *gvt)
	{
	if (!gvt->firmware.firmware_loaded)
	clean_firmware_sysfs(gvt);

	kfree(gvt->firmware.cfg_space);
	kfree(gvt->firmware.mmio);
	}

	static int verify_firmware(struct intel_gvt *gvt,
	const struct firmware *fw)
	{
	struct intel_gvt_device_info *info = &gvt->device_info;
	struct drm_i915_private *dev_priv = gvt->dev_priv;
	struct pci_dev *pdev = dev_priv->drm.pdev;
	struct gvt_firmware_header *h;
	unsigned long id, crc32_start;
	const void *mem;
	const char *item;
	u64 file, request;

	h = (struct gvt_firmware_header *)fw->data;

	crc32_start = offsetof(struct gvt_firmware_header, crc32) + 4;
	mem = fw->data + crc32_start;

	#define VERIFY(s, a, b) do { \
	item = (s); file = (u64)(a); request = (u64)(b); \
	if ((a) != (b)) \
	goto invalid_firmware; \
	} while (0)

	VERIFY("magic number", h->magic, VGT_MAGIC);
	VERIFY("version", h->version, FIRMWARE_VERSION);
	VERIFY("crc32", h->crc32, crc32_le(0, mem, fw->size - crc32_start));
	VERIFY("cfg space size", h->cfg_space_size, info->cfg_space_size);
	VERIFY("mmio size", h->mmio_size, info->mmio_size);

	mem = (fw->data + h->cfg_space_offset);

	id = (u16 )(mem + PCI_VENDOR_ID);
	VERIFY("vender id", id, pdev->vendor);

	id = (u16 )(mem + PCI_DEVICE_ID);
	VERIFY("device id", id, pdev->device);

	id = (u8 )(mem + PCI_REVISION_ID);
	VERIFY("revision id", id, pdev->revision);

	#undef VERIFY
	return 0;

	invalid_firmware:
	gvt_dbg_core("Invalid firmware: %s [file] 0x%llx [request] 0x%llx\n",
	item, file, request);
	return -EINVAL;
	}

	#define GVT_FIRMWARE_PATH "i915/gvt"

	/**
	* intel_gvt_load_firmware - load GVT firmware
	* @gvt: intel gvt device
	*
	*/
	int intel_gvt_load_firmware(struct intel_gvt *gvt)
	{
	struct intel_gvt_device_info *info = &gvt->device_info;
	struct drm_i915_private *dev_priv = gvt->dev_priv;
	struct pci_dev *pdev = dev_priv->drm.pdev;
	struct intel_gvt_firmware *firmware = &gvt->firmware;
	struct gvt_firmware_header *h;
	const struct firmware *fw;
	char *path;
	void *mem;
	int ret;

	path = kmalloc(PATH_MAX, GFP_KERNEL);
	if (!path)
	return -ENOMEM;

	mem = kmalloc(info->cfg_space_size, GFP_KERNEL);
	if (!mem) {
	kfree(path);
	return -ENOMEM;
	}

	firmware->cfg_space = mem;

	mem = kmalloc(info->mmio_size, GFP_KERNEL);
	if (!mem) {
	kfree(path);
	kfree(firmware->cfg_space);
	return -ENOMEM;
	}

	firmware->mmio = mem;

	sprintf(path, "%s/vid_0x%04x_did_0x%04x_rid_0x%02x.golden_hw_state",
	GVT_FIRMWARE_PATH, pdev->vendor, pdev->device,
	pdev->revision);

	gvt_dbg_core("request hw state firmware %s...\n", path);

	ret = request_firmware(&fw, path, &dev_priv->drm.pdev->dev);
	kfree(path);

	if (ret)
	goto expose_firmware;

	gvt_dbg_core("success.\n");

	ret = verify_firmware(gvt, fw);
	if (ret)
	goto out_free_fw;

	gvt_dbg_core("verified.\n");

	h = (struct gvt_firmware_header *)fw->data;

	memcpy(firmware->cfg_space, fw->data + h->cfg_space_offset,
	h->cfg_space_size);
	memcpy(firmware->mmio, fw->data + h->mmio_offset,
	h->mmio_size);

	release_firmware(fw);
	firmware->firmware_loaded = true;
	return 0;

	out_free_fw:
	release_firmware(fw);
	expose_firmware:
	expose_firmware_sysfs(gvt);
	return 0;
	}