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path: root/drivers/base/firmware_loader/main.c
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Diffstat (limited to 'drivers/base/firmware_loader/main.c')
-rw-r--r--drivers/base/firmware_loader/main.c152
1 files changed, 115 insertions, 37 deletions
diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c
index 9da0c9d5f538..78355095e00d 100644
--- a/drivers/base/firmware_loader/main.c
+++ b/drivers/base/firmware_loader/main.c
@@ -12,6 +12,7 @@
#include <linux/capability.h>
#include <linux/device.h>
+#include <linux/kernel_read_file.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/timer.h>
@@ -167,10 +168,21 @@ static int fw_cache_piggyback_on_request(const char *name);
static struct fw_priv *__allocate_fw_priv(const char *fw_name,
struct firmware_cache *fwc,
- void *dbuf, size_t size)
+ void *dbuf,
+ size_t size,
+ size_t offset,
+ u32 opt_flags)
{
struct fw_priv *fw_priv;
+ /* For a partial read, the buffer must be preallocated. */
+ if ((opt_flags & FW_OPT_PARTIAL) && !dbuf)
+ return NULL;
+
+ /* Only partial reads are allowed to use an offset. */
+ if (offset != 0 && !(opt_flags & FW_OPT_PARTIAL))
+ return NULL;
+
fw_priv = kzalloc(sizeof(*fw_priv), GFP_ATOMIC);
if (!fw_priv)
return NULL;
@@ -185,6 +197,8 @@ static struct fw_priv *__allocate_fw_priv(const char *fw_name,
fw_priv->fwc = fwc;
fw_priv->data = dbuf;
fw_priv->allocated_size = size;
+ fw_priv->offset = offset;
+ fw_priv->opt_flags = opt_flags;
fw_state_init(fw_priv);
#ifdef CONFIG_FW_LOADER_USER_HELPER
INIT_LIST_HEAD(&fw_priv->pending_list);
@@ -209,13 +223,20 @@ static struct fw_priv *__lookup_fw_priv(const char *fw_name)
/* Returns 1 for batching firmware requests with the same name */
static int alloc_lookup_fw_priv(const char *fw_name,
struct firmware_cache *fwc,
- struct fw_priv **fw_priv, void *dbuf,
- size_t size, u32 opt_flags)
+ struct fw_priv **fw_priv,
+ void *dbuf,
+ size_t size,
+ size_t offset,
+ u32 opt_flags)
{
struct fw_priv *tmp;
spin_lock(&fwc->lock);
- if (!(opt_flags & FW_OPT_NOCACHE)) {
+ /*
+ * Do not merge requests that are marked to be non-cached or
+ * are performing partial reads.
+ */
+ if (!(opt_flags & (FW_OPT_NOCACHE | FW_OPT_PARTIAL))) {
tmp = __lookup_fw_priv(fw_name);
if (tmp) {
kref_get(&tmp->ref);
@@ -226,7 +247,7 @@ static int alloc_lookup_fw_priv(const char *fw_name,
}
}
- tmp = __allocate_fw_priv(fw_name, fwc, dbuf, size);
+ tmp = __allocate_fw_priv(fw_name, fwc, dbuf, size, offset, opt_flags);
if (tmp) {
INIT_LIST_HEAD(&tmp->list);
if (!(opt_flags & FW_OPT_NOCACHE))
@@ -252,9 +273,11 @@ static void __free_fw_priv(struct kref *ref)
list_del(&fw_priv->list);
spin_unlock(&fwc->lock);
- fw_free_paged_buf(fw_priv); /* free leftover pages */
- if (!fw_priv->allocated_size)
+ if (fw_is_paged_buf(fw_priv))
+ fw_free_paged_buf(fw_priv);
+ else if (!fw_priv->allocated_size)
vfree(fw_priv->data);
+
kfree_const(fw_priv->fw_name);
kfree(fw_priv);
}
@@ -268,6 +291,11 @@ static void free_fw_priv(struct fw_priv *fw_priv)
}
#ifdef CONFIG_FW_LOADER_PAGED_BUF
+bool fw_is_paged_buf(struct fw_priv *fw_priv)
+{
+ return fw_priv->is_paged_buf;
+}
+
void fw_free_paged_buf(struct fw_priv *fw_priv)
{
int i;
@@ -275,6 +303,8 @@ void fw_free_paged_buf(struct fw_priv *fw_priv)
if (!fw_priv->pages)
return;
+ vunmap(fw_priv->data);
+
for (i = 0; i < fw_priv->nr_pages; i++)
__free_page(fw_priv->pages[i]);
kvfree(fw_priv->pages);
@@ -328,10 +358,6 @@ int fw_map_paged_buf(struct fw_priv *fw_priv)
if (!fw_priv->data)
return -ENOMEM;
- /* page table is no longer needed after mapping, let's free */
- kvfree(fw_priv->pages);
- fw_priv->pages = NULL;
-
return 0;
}
#endif
@@ -461,18 +487,16 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv,
size_t in_size,
const void *in_buffer))
{
- loff_t size;
+ size_t size;
int i, len;
int rc = -ENOENT;
char *path;
- enum kernel_read_file_id id = READING_FIRMWARE;
size_t msize = INT_MAX;
void *buffer = NULL;
/* Already populated data member means we're loading into a buffer */
if (!decompress && fw_priv->data) {
buffer = fw_priv->data;
- id = READING_FIRMWARE_PREALLOC_BUFFER;
msize = fw_priv->allocated_size;
}
@@ -481,6 +505,9 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv,
return -ENOMEM;
for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
+ size_t file_size = 0;
+ size_t *file_size_ptr = NULL;
+
/* skip the unset customized path */
if (!fw_path[i][0])
continue;
@@ -494,10 +521,20 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv,
fw_priv->size = 0;
+ /*
+ * The total file size is only examined when doing a partial
+ * read; the "full read" case needs to fail if the whole
+ * firmware was not completely loaded.
+ */
+ if ((fw_priv->opt_flags & FW_OPT_PARTIAL) && buffer)
+ file_size_ptr = &file_size;
+
/* load firmware files from the mount namespace of init */
- rc = kernel_read_file_from_path_initns(path, &buffer,
- &size, msize, id);
- if (rc) {
+ rc = kernel_read_file_from_path_initns(path, fw_priv->offset,
+ &buffer, msize,
+ file_size_ptr,
+ READING_FIRMWARE);
+ if (rc < 0) {
if (rc != -ENOENT)
dev_warn(device, "loading %s failed with error %d\n",
path, rc);
@@ -506,6 +543,9 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv,
path);
continue;
}
+ size = rc;
+ rc = 0;
+
dev_dbg(device, "Loading firmware from %s\n", path);
if (decompress) {
dev_dbg(device, "f/w decompressing %s\n",
@@ -632,7 +672,7 @@ static int fw_add_devm_name(struct device *dev, const char *name)
}
#endif
-int assign_fw(struct firmware *fw, struct device *device, u32 opt_flags)
+int assign_fw(struct firmware *fw, struct device *device)
{
struct fw_priv *fw_priv = fw->priv;
int ret;
@@ -651,8 +691,8 @@ int assign_fw(struct firmware *fw, struct device *device, u32 opt_flags)
* should be fixed in devres or driver core.
*/
/* don't cache firmware handled without uevent */
- if (device && (opt_flags & FW_OPT_UEVENT) &&
- !(opt_flags & FW_OPT_NOCACHE)) {
+ if (device && (fw_priv->opt_flags & FW_OPT_UEVENT) &&
+ !(fw_priv->opt_flags & FW_OPT_NOCACHE)) {
ret = fw_add_devm_name(device, fw_priv->fw_name);
if (ret) {
mutex_unlock(&fw_lock);
@@ -664,7 +704,7 @@ int assign_fw(struct firmware *fw, struct device *device, u32 opt_flags)
* After caching firmware image is started, let it piggyback
* on request firmware.
*/
- if (!(opt_flags & FW_OPT_NOCACHE) &&
+ if (!(fw_priv->opt_flags & FW_OPT_NOCACHE) &&
fw_priv->fwc->state == FW_LOADER_START_CACHE) {
if (fw_cache_piggyback_on_request(fw_priv->fw_name))
kref_get(&fw_priv->ref);
@@ -683,7 +723,7 @@ int assign_fw(struct firmware *fw, struct device *device, u32 opt_flags)
static int
_request_firmware_prepare(struct firmware **firmware_p, const char *name,
struct device *device, void *dbuf, size_t size,
- u32 opt_flags)
+ size_t offset, u32 opt_flags)
{
struct firmware *firmware;
struct fw_priv *fw_priv;
@@ -702,7 +742,7 @@ _request_firmware_prepare(struct firmware **firmware_p, const char *name,
}
ret = alloc_lookup_fw_priv(name, &fw_cache, &fw_priv, dbuf, size,
- opt_flags);
+ offset, opt_flags);
/*
* bind with 'priv' now to avoid warning in failure path
@@ -749,9 +789,10 @@ static void fw_abort_batch_reqs(struct firmware *fw)
static int
_request_firmware(const struct firmware **firmware_p, const char *name,
struct device *device, void *buf, size_t size,
- u32 opt_flags)
+ size_t offset, u32 opt_flags)
{
struct firmware *fw = NULL;
+ bool nondirect = false;
int ret;
if (!firmware_p)
@@ -763,28 +804,34 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
}
ret = _request_firmware_prepare(&fw, name, device, buf, size,
- opt_flags);
+ offset, opt_flags);
if (ret <= 0) /* error or already assigned */
goto out;
ret = fw_get_filesystem_firmware(device, fw->priv, "", NULL);
+
+ /* Only full reads can support decompression, platform, and sysfs. */
+ if (!(opt_flags & FW_OPT_PARTIAL))
+ nondirect = true;
+
#ifdef CONFIG_FW_LOADER_COMPRESS
- if (ret == -ENOENT)
+ if (ret == -ENOENT && nondirect)
ret = fw_get_filesystem_firmware(device, fw->priv, ".xz",
fw_decompress_xz);
#endif
-
- if (ret == -ENOENT)
- ret = firmware_fallback_platform(fw->priv, opt_flags);
+ if (ret == -ENOENT && nondirect)
+ ret = firmware_fallback_platform(fw->priv);
if (ret) {
if (!(opt_flags & FW_OPT_NO_WARN))
dev_warn(device,
"Direct firmware load for %s failed with error %d\n",
name, ret);
- ret = firmware_fallback_sysfs(fw, name, device, opt_flags, ret);
+ if (nondirect)
+ ret = firmware_fallback_sysfs(fw, name, device,
+ opt_flags, ret);
} else
- ret = assign_fw(fw, device, opt_flags);
+ ret = assign_fw(fw, device);
out:
if (ret < 0) {
@@ -825,7 +872,7 @@ request_firmware(const struct firmware **firmware_p, const char *name,
/* Need to pin this module until return */
__module_get(THIS_MODULE);
- ret = _request_firmware(firmware_p, name, device, NULL, 0,
+ ret = _request_firmware(firmware_p, name, device, NULL, 0, 0,
FW_OPT_UEVENT);
module_put(THIS_MODULE);
return ret;
@@ -852,7 +899,7 @@ int firmware_request_nowarn(const struct firmware **firmware, const char *name,
/* Need to pin this module until return */
__module_get(THIS_MODULE);
- ret = _request_firmware(firmware, name, device, NULL, 0,
+ ret = _request_firmware(firmware, name, device, NULL, 0, 0,
FW_OPT_UEVENT | FW_OPT_NO_WARN);
module_put(THIS_MODULE);
return ret;
@@ -876,7 +923,7 @@ int request_firmware_direct(const struct firmware **firmware_p,
int ret;
__module_get(THIS_MODULE);
- ret = _request_firmware(firmware_p, name, device, NULL, 0,
+ ret = _request_firmware(firmware_p, name, device, NULL, 0, 0,
FW_OPT_UEVENT | FW_OPT_NO_WARN |
FW_OPT_NOFALLBACK_SYSFS);
module_put(THIS_MODULE);
@@ -901,7 +948,7 @@ int firmware_request_platform(const struct firmware **firmware,
/* Need to pin this module until return */
__module_get(THIS_MODULE);
- ret = _request_firmware(firmware, name, device, NULL, 0,
+ ret = _request_firmware(firmware, name, device, NULL, 0, 0,
FW_OPT_UEVENT | FW_OPT_FALLBACK_PLATFORM);
module_put(THIS_MODULE);
return ret;
@@ -957,7 +1004,7 @@ request_firmware_into_buf(const struct firmware **firmware_p, const char *name,
return -EOPNOTSUPP;
__module_get(THIS_MODULE);
- ret = _request_firmware(firmware_p, name, device, buf, size,
+ ret = _request_firmware(firmware_p, name, device, buf, size, 0,
FW_OPT_UEVENT | FW_OPT_NOCACHE);
module_put(THIS_MODULE);
return ret;
@@ -965,6 +1012,37 @@ request_firmware_into_buf(const struct firmware **firmware_p, const char *name,
EXPORT_SYMBOL(request_firmware_into_buf);
/**
+ * request_partial_firmware_into_buf() - load partial firmware into a previously allocated buffer
+ * @firmware_p: pointer to firmware image
+ * @name: name of firmware file
+ * @device: device for which firmware is being loaded and DMA region allocated
+ * @buf: address of buffer to load firmware into
+ * @size: size of buffer
+ * @offset: offset into file to read
+ *
+ * This function works pretty much like request_firmware_into_buf except
+ * it allows a partial read of the file.
+ */
+int
+request_partial_firmware_into_buf(const struct firmware **firmware_p,
+ const char *name, struct device *device,
+ void *buf, size_t size, size_t offset)
+{
+ int ret;
+
+ if (fw_cache_is_setup(device, name))
+ return -EOPNOTSUPP;
+
+ __module_get(THIS_MODULE);
+ ret = _request_firmware(firmware_p, name, device, buf, size, offset,
+ FW_OPT_UEVENT | FW_OPT_NOCACHE |
+ FW_OPT_PARTIAL);
+ module_put(THIS_MODULE);
+ return ret;
+}
+EXPORT_SYMBOL(request_partial_firmware_into_buf);
+
+/**
* release_firmware() - release the resource associated with a firmware image
* @fw: firmware resource to release
**/
@@ -996,7 +1074,7 @@ static void request_firmware_work_func(struct work_struct *work)
fw_work = container_of(work, struct firmware_work, work);
- _request_firmware(&fw, fw_work->name, fw_work->device, NULL, 0,
+ _request_firmware(&fw, fw_work->name, fw_work->device, NULL, 0, 0,
fw_work->opt_flags);
fw_work->cont(fw, fw_work->context);
put_device(fw_work->device); /* taken in request_firmware_nowait() */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.