path: root/drivers/gpu/drm/msm/adreno/adreno_gpu.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 *
 * Copyright (c) 2014 The Linux Foundation. All rights reserved.
 */

#include <linux/ascii85.h>
#include <linux/interconnect.h>
#include <linux/firmware/qcom/qcom_scm.h>
#include <linux/kernel.h>
#include <linux/of_address.h>
#include <linux/pm_opp.h>
#include <linux/slab.h>
#include <linux/soc/qcom/mdt_loader.h>
#include <linux/nvmem-consumer.h>
#include <soc/qcom/ocmem.h>
#include "adreno_gpu.h"
#include "a6xx_gpu.h"
#include "msm_gem.h"
#include "msm_mmu.h"

static u64 address_space_size = 0;
MODULE_PARM_DESC(address_space_size, "Override for size of processes private GPU address space");
module_param(address_space_size, ullong, 0600);

static bool zap_available = true;

static int zap_shader_load_mdt(struct msm_gpu *gpu, const char *fwname,
		u32 pasid)
{
	struct device *dev = &gpu->pdev->dev;
	const struct firmware *fw;
	const char *signed_fwname = NULL;
	struct device_node *np, *mem_np;
	struct resource r;
	phys_addr_t mem_phys;
	ssize_t mem_size;
	void *mem_region = NULL;
	int ret;

	if (!IS_ENABLED(CONFIG_ARCH_QCOM)) {
		zap_available = false;
		return -EINVAL;
	}

	np = of_get_child_by_name(dev->of_node, "zap-shader");
	if (!of_device_is_available(np)) {
		zap_available = false;
		return -ENODEV;
	}

	mem_np = of_parse_phandle(np, "memory-region", 0);
	of_node_put(np);
	if (!mem_np) {
		zap_available = false;
		return -EINVAL;
	}

	ret = of_address_to_resource(mem_np, 0, &r);
	of_node_put(mem_np);
	if (ret)
		return ret;

	mem_phys = r.start;

	/*
	 * Check for a firmware-name property.  This is the new scheme
	 * to handle firmware that may be signed with device specific
	 * keys, allowing us to have a different zap fw path for different
	 * devices.
	 *
	 * If the firmware-name property is found, we bypass the
	 * adreno_request_fw() mechanism, because we don't need to handle
	 * the /lib/firmware/qcom/... vs /lib/firmware/... case.
	 *
	 * If the firmware-name property is not found, for backwards
	 * compatibility we fall back to the fwname from the gpulist
	 * table.
	 */
	of_property_read_string_index(np, "firmware-name", 0, &signed_fwname);
	if (signed_fwname) {
		fwname = signed_fwname;
		ret = request_firmware_direct(&fw, fwname, gpu->dev->dev);
		if (ret)
			fw = ERR_PTR(ret);
	} else if (fwname) {
		/* Request the MDT file from the default location: */
		fw = adreno_request_fw(to_adreno_gpu(gpu), fwname);
	} else {
		/*
		 * For new targets, we require the firmware-name property,
		 * if a zap-shader is required, rather than falling back
		 * to a firmware name specified in gpulist.
		 *
		 * Because the firmware is signed with a (potentially)
		 * device specific key, having the name come from gpulist
		 * was a bad idea, and is only provided for backwards
		 * compatibility for older targets.
		 */
		return -ENOENT;
	}

	if (IS_ERR(fw)) {
		DRM_DEV_ERROR(dev, "Unable to load %s\n", fwname);
		return PTR_ERR(fw);
	}

	/* Figure out how much memory we need */
	mem_size = qcom_mdt_get_size(fw);
	if (mem_size < 0) {
		ret = mem_size;
		goto out;
	}

	if (mem_size > resource_size(&r)) {
		DRM_DEV_ERROR(dev,
			"memory region is too small to load the MDT\n");
		ret = -E2BIG;
		goto out;
	}

	/* Allocate memory for the firmware image */
	mem_region = memremap(mem_phys, mem_size,  MEMREMAP_WC);
	if (!mem_region) {
		ret = -ENOMEM;
		goto out;
	}

	/*
	 * Load the rest of the MDT
	 *
	 * Note that we could be dealing with two different paths, since
	 * with upstream linux-firmware it would be in a qcom/ subdir..
	 * adreno_request_fw() handles this, but qcom_mdt_load() does
	 * not.  But since we've already gotten through adreno_request_fw()
	 * we know which of the two cases it is:
	 */
	if (signed_fwname || (to_adreno_gpu(gpu)->fwloc == FW_LOCATION_LEGACY)) {
		ret = qcom_mdt_load(dev, fw, fwname, pasid,
				mem_region, mem_phys, mem_size, NULL);
	} else {
		char *newname;

		newname = kasprintf(GFP_KERNEL, "qcom/%s", fwname);

		ret = qcom_mdt_load(dev, fw, newname, pasid,
				mem_region, mem_phys, mem_size, NULL);
		kfree(newname);
	}
	if (ret)
		goto out;

	/* Send the image to the secure world */
	ret = qcom_scm_pas_auth_and_reset(pasid);

	/*
	 * If the scm call returns -EOPNOTSUPP we assume that this target
	 * doesn't need/support the zap shader so quietly fail
	 */
	if (ret == -EOPNOTSUPP)
		zap_available = false;
	else if (