// 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/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 <soc/qcom/ocmem.h>
#include "adreno_gpu.h"
#include "msm_gem.h"
#include "msm_mmu.h"
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 (!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 -ENODEV;
}
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);