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// SPDX-License-Identifier: GPL-2.0-only
/*
* Framework for parsing the firmware image configuration.
*
* Copyright (C) 2022 Google LLC
*/
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <gcip/gcip-image-config.h>
static int setup_iommu_mappings(struct gcip_image_config_parser *parser,
struct gcip_image_config *config)
{
int i, ret;
dma_addr_t daddr;
size_t size;
phys_addr_t paddr;
for (i = 0; i < config->num_iommu_mappings; i++) {
daddr = config->iommu_mappings[i].virt_address;
if (unlikely(!daddr)) {
dev_warn(parser->dev, "Invalid config, device address is zero");
ret = -EIO;
goto err;
}
size = gcip_config_to_size(config->iommu_mappings[i].image_config_value);
paddr = config->iommu_mappings[i].image_config_value & GCIP_IMG_CFG_ADDR_MASK;
dev_dbg(parser->dev, "Image config adding IOMMU mapping: %pad -> %pap", &daddr,
&paddr);
if (unlikely(daddr + size <= daddr || paddr + size <= paddr)) {
ret = -EOVERFLOW;
goto err;
}
ret = parser->ops->map(parser->data, daddr, paddr, size,
GCIP_IMAGE_CONFIG_FLAGS_SECURE);
if (ret) {
dev_err(parser->dev,
"Unable to Map: %d dma_addr: %pad phys_addr: %pap size: %#lx\n",
ret, &daddr, &paddr, size);
goto err;
}
}
return 0;
err:
while (i--) {
daddr = config->iommu_mappings[i].virt_address;
size = gcip_config_to_size(config->iommu_mappings[i].image_config_value);
parser->ops->unmap(parser->data, daddr, size, GCIP_IMAGE_CONFIG_FLAGS_SECURE);
}
return ret;
}
static void clear_iommu_mappings(struct gcip_image_config_parser *parser,
struct gcip_image_config *config)
{
dma_addr_t daddr;
size_t size;
int i;
for (i = config->num_iommu_mappings - 1; i >= 0; i--) {
daddr = config->iommu_mappings[i].virt_address;
size = gcip_config_to_size(config->iommu_mappings[i].image_config_value);
dev_dbg(parser->dev, "Image config removing IOMMU mapping: %pad size=%#lx", &daddr,
size);
parser->ops->unmap(parser->data, daddr, size, GCIP_IMAGE_CONFIG_FLAGS_SECURE);
}
}
static int setup_ns_iommu_mappings(struct gcip_image_config_parser *parser,
struct gcip_image_config *config)
{
dma_addr_t daddr;
size_t size;
int ret, i;
phys_addr_t paddr = 0;
for (i = 0; i < config->num_ns_iommu_mappings; i++) {
daddr = config->ns_iommu_mappings[i] & GCIP_IMG_CFG_ADDR_MASK;
if (unlikely(!daddr)) {
dev_warn(parser->dev, "Invalid config, device address is zero");
ret = -EIO;
goto err;
}
size = gcip_ns_config_to_size(config->ns_iommu_mappings[i]);
dev_dbg(parser->dev, "Image config adding NS IOMMU mapping: %pad -> %pap", &daddr,
&paddr);
if (unlikely(daddr + size <= daddr || paddr + size <= paddr)) {
ret = -EOVERFLOW;
goto err;
}
ret = parser->ops->map(parser->data, daddr, paddr, size, 0);
if (ret)
goto err;
paddr += size;
}
return 0;
err:
while (i--) {
size = gcip_ns_config_to_size(config->ns_iommu_mappings[i]);
daddr = config->ns_iommu_mappings[i] & GCIP_IMG_CFG_ADDR_MASK;
parser->ops->unmap(parser->data, daddr, size, 0);
}
return ret;
}
static void clear_ns_iommu_mappings(struct gcip_image_config_parser *parser,
struct gcip_image_config *config)
{
dma_addr_t daddr;
size_t size;
int i;
for (i = config->num_ns_iommu_mappings - 1; i >= 0; i--) {
size = gcip_ns_config_to_size(config->ns_iommu_mappings[i]);
daddr = config->ns_iommu_mappings[i] & GCIP_IMG_CFG_ADDR_MASK;
dev_dbg(parser->dev, "Image config removing NS IOMMU mapping: %pad size=%#lx",
&daddr, size);
parser->ops->unmap(parser->data, daddr, size, 0);
}
}
static int map_image_config(struct gcip_image_config_parser *parser,
struct gcip_image_config *config)
{
int ret = setup_ns_iommu_mappings(parser, config);
if (ret)
return ret;
if (gcip_image_config_is_ns(config)) {
ret = setup_iommu_mappings(parser, config);
if (ret)
clear_ns_iommu_mappings(parser, config);
}
return ret;
}
static void unmap_image_config(struct gcip_image_config_parser *parser,
struct gcip_image_config *config)
{
if (gcip_image_config_is_ns(config))
clear_iommu_mappings(parser, config);
clear_ns_iommu_mappings(parser, config);
}
int gcip_image_config_parser_init(struct gcip_image_config_parser *parser,
const struct gcip_image_config_ops *ops, struct device *dev,
void *data)
{
if (!ops->map || !ops->unmap) {
dev_err(dev, "Missing mandatory operations for image config parser");
return -EINVAL;
}
parser->dev = dev;
parser->data = data;
parser->ops = ops;
memset(&parser->last_config, 0, sizeof(parser->last_config));
return 0;
}
int gcip_image_config_parse(struct gcip_image_config_parser *parser,
struct gcip_image_config *config)
{
int ret;
if (!memcmp(config, &parser->last_config, sizeof(*config)))
return 0;
unmap_image_config(parser, &parser->last_config);
ret = map_image_config(parser, config);
if (ret) {
dev_err(parser->dev, "Map image config failed: %d", ret);
/*
* Weird case as the mappings in the last config were just removed - might happen
* if the IOMMU driver state is corrupted. We can't help to rescue it so let's
* simply log a message.
*/
if (unlikely(map_image_config(parser, &parser->last_config)))
dev_err(parser->dev, "Failed to roll back the last image config");
return ret;
}
memcpy(&parser->last_config, config, sizeof(parser->last_config));
return 0;
}
void gcip_image_config_clear(struct gcip_image_config_parser *parser)
{
unmap_image_config(parser, &parser->last_config);
memset(&parser->last_config, 0, sizeof(parser->last_config));
}
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