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path: root/drivers/base/firmware_loader/fallback.c
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Diffstat (limited to 'drivers/base/firmware_loader/fallback.c')
-rw-r--r--drivers/base/firmware_loader/fallback.c430
1 files changed, 0 insertions, 430 deletions
diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c
index 4afb0e9312c0..bf68e3947814 100644
--- a/drivers/base/firmware_loader/fallback.c
+++ b/drivers/base/firmware_loader/fallback.c
@@ -3,12 +3,9 @@
#include <linux/types.h>
#include <linux/kconfig.h>
#include <linux/list.h>
-#include <linux/slab.h>
#include <linux/security.h>
-#include <linux/highmem.h>
#include <linux/umh.h>
#include <linux/sysctl.h>
-#include <linux/vmalloc.h>
#include <linux/module.h>
#include "fallback.h"
@@ -18,22 +15,6 @@
* firmware fallback mechanism
*/
-MODULE_IMPORT_NS(FIRMWARE_LOADER_PRIVATE);
-
-extern struct firmware_fallback_config fw_fallback_config;
-
-/* These getters are vetted to use int properly */
-static inline int __firmware_loading_timeout(void)
-{
- return fw_fallback_config.loading_timeout;
-}
-
-/* These setters are vetted to use int properly */
-static void __fw_fallback_set_timeout(int timeout)
-{
- fw_fallback_config.loading_timeout = timeout;
-}
-
/*
* use small loading timeout for caching devices' firmware because all these
* firmware images have been loaded successfully at lease once, also system is
@@ -58,52 +39,11 @@ static long firmware_loading_timeout(void)
__firmware_loading_timeout() * HZ : MAX_JIFFY_OFFSET;
}
-static inline bool fw_sysfs_done(struct fw_priv *fw_priv)
-{
- return __fw_state_check(fw_priv, FW_STATUS_DONE);
-}
-
-static inline bool fw_sysfs_loading(struct fw_priv *fw_priv)
-{
- return __fw_state_check(fw_priv, FW_STATUS_LOADING);
-}
-
static inline int fw_sysfs_wait_timeout(struct fw_priv *fw_priv, long timeout)
{
return __fw_state_wait_common(fw_priv, timeout);
}
-struct fw_sysfs {
- bool nowait;
- struct device dev;
- struct fw_priv *fw_priv;
- struct firmware *fw;
-};
-
-static struct fw_sysfs *to_fw_sysfs(struct device *dev)
-{
- return container_of(dev, struct fw_sysfs, dev);
-}
-
-static void __fw_load_abort(struct fw_priv *fw_priv)
-{
- /*
- * There is a small window in which user can write to 'loading'
- * between loading done/aborted and disappearance of 'loading'
- */
- if (fw_state_is_aborted(fw_priv) || fw_sysfs_done(fw_priv))
- return;
-
- fw_state_aborted(fw_priv);
-}
-
-static void fw_load_abort(struct fw_sysfs *fw_sysfs)
-{
- struct fw_priv *fw_priv = fw_sysfs->fw_priv;
-
- __fw_load_abort(fw_priv);
-}
-
static LIST_HEAD(pending_fw_head);
void kill_pending_fw_fallback_reqs(bool only_kill_custom)
@@ -120,376 +60,6 @@ void kill_pending_fw_fallback_reqs(bool only_kill_custom)
mutex_unlock(&fw_lock);
}
-static ssize_t timeout_show(struct class *class, struct class_attribute *attr,
- char *buf)
-{
- return sysfs_emit(buf, "%d\n", __firmware_loading_timeout());
-}
-
-/**
- * timeout_store() - set number of seconds to wait for firmware
- * @class: device class pointer
- * @attr: device attribute pointer
- * @buf: buffer to scan for timeout value
- * @count: number of bytes in @buf
- *
- * Sets the number of seconds to wait for the firmware. Once
- * this expires an error will be returned to the driver and no
- * firmware will be provided.
- *
- * Note: zero means 'wait forever'.
- **/
-static ssize_t timeout_store(struct class *class, struct class_attribute *attr,
- const char *buf, size_t count)
-{
- int tmp_loading_timeout = simple_strtol(buf, NULL, 10);
-
- if (tmp_loading_timeout < 0)
- tmp_loading_timeout = 0;
-
- __fw_fallback_set_timeout(tmp_loading_timeout);
-
- return count;
-}
-static CLASS_ATTR_RW(timeout);
-
-static struct attribute *firmware_class_attrs[] = {
- &class_attr_timeout.attr,
- NULL,
-};
-ATTRIBUTE_GROUPS(firmware_class);
-
-static void fw_dev_release(struct device *dev)
-{
- struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
-
- kfree(fw_sysfs);
-}
-
-static int do_firmware_uevent(struct fw_sysfs *fw_sysfs, struct kobj_uevent_env *env)
-{
- if (add_uevent_var(env, "FIRMWARE=%s", fw_sysfs->fw_priv->fw_name))
- return -ENOMEM;
- if (add_uevent_var(env, "TIMEOUT=%i", __firmware_loading_timeout()))
- return -ENOMEM;
- if (add_uevent_var(env, "ASYNC=%d", fw_sysfs->nowait))
- return -ENOMEM;
-
- return 0;
-}
-
-static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env)
-{
- struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
- int err = 0;
-
- mutex_lock(&fw_lock);
- if (fw_sysfs->fw_priv)
- err = do_firmware_uevent(fw_sysfs, env);
- mutex_unlock(&fw_lock);
- return err;
-}
-
-static struct class firmware_class = {
- .name = "firmware",
- .class_groups = firmware_class_groups,
- .dev_uevent = firmware_uevent,
- .dev_release = fw_dev_release,
-};
-
-int register_sysfs_loader(void)
-{
- int ret = class_register(&firmware_class);
-
- if (ret != 0)
- return ret;
- return register_firmware_config_sysctl();
-}
-
-void unregister_sysfs_loader(void)
-{
- unregister_firmware_config_sysctl();
- class_unregister(&firmware_class);
-}
-
-static ssize_t firmware_loading_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
- int loading = 0;
-
- mutex_lock(&fw_lock);
- if (fw_sysfs->fw_priv)
- loading = fw_sysfs_loading(fw_sysfs->fw_priv);
- mutex_unlock(&fw_lock);
-
- return sysfs_emit(buf, "%d\n", loading);
-}
-
-/**
- * firmware_loading_store() - set value in the 'loading' control file
- * @dev: device pointer
- * @attr: device attribute pointer
- * @buf: buffer to scan for loading control value
- * @count: number of bytes in @buf
- *
- * The relevant values are:
- *
- * 1: Start a load, discarding any previous partial load.
- * 0: Conclude the load and hand the data to the driver code.
- * -1: Conclude the load with an error and discard any written data.
- **/
-static ssize_t firmware_loading_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
- struct fw_priv *fw_priv;
- ssize_t written = count;
- int loading = simple_strtol(buf, NULL, 10);
-
- mutex_lock(&fw_lock);
- fw_priv = fw_sysfs->fw_priv;
- if (fw_state_is_aborted(fw_priv))
- goto out;
-
- switch (loading) {
- case 1:
- /* discarding any previous partial load */
- if (!fw_sysfs_done(fw_priv)) {
- fw_free_paged_buf(fw_priv);
- fw_state_start(fw_priv);
- }
- break;
- case 0:
- if (fw_sysfs_loading(fw_priv)) {
- int rc;
-
- /*
- * Several loading requests may be pending on
- * one same firmware buf, so let all requests
- * see the mapped 'buf->data' once the loading
- * is completed.
- * */
- rc = fw_map_paged_buf(fw_priv);
- if (rc)
- dev_err(dev, "%s: map pages failed\n",
- __func__);
- else
- rc = security_kernel_post_load_data(fw_priv->data,
- fw_priv->size,
- LOADING_FIRMWARE, "blob");
-
- /*
- * Same logic as fw_load_abort, only the DONE bit
- * is ignored and we set ABORT only on failure.
- */
- if (rc) {
- fw_state_aborted(fw_priv);
- written = rc;
- } else {
- fw_state_done(fw_priv);
- }
- break;
- }
- fallthrough;
- default:
- dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading);
- fallthrough;
- case -1:
- fw_load_abort(fw_sysfs);
- break;
- }
-out:
- mutex_unlock(&fw_lock);
- return written;
-}
-
-static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store);
-
-static void firmware_rw_data(struct fw_priv *fw_priv, char *buffer,
- loff_t offset, size_t count, bool read)
-{
- if (read)
- memcpy(buffer, fw_priv->data + offset, count);
- else
- memcpy(fw_priv->data + offset, buffer, count);
-}
-
-static void firmware_rw(struct fw_priv *fw_priv, char *buffer,
- loff_t offset, size_t count, bool read)
-{
- while (count) {
- void *page_data;
- int page_nr = offset >> PAGE_SHIFT;
- int page_ofs = offset & (PAGE_SIZE-1);
- int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
-
- page_data = kmap(fw_priv->pages[page_nr]);
-
- if (read)
- memcpy(buffer, page_data + page_ofs, page_cnt);
- else
- memcpy(page_data + page_ofs, buffer, page_cnt);
-
- kunmap(fw_priv->pages[page_nr]);
- buffer += page_cnt;
- offset += page_cnt;
- count -= page_cnt;
- }
-}
-
-static ssize_t firmware_data_read(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buffer, loff_t offset, size_t count)
-{
- struct device *dev = kobj_to_dev(kobj);
- struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
- struct fw_priv *fw_priv;
- ssize_t ret_count;
-
- mutex_lock(&fw_lock);
- fw_priv = fw_sysfs->fw_priv;
- if (!fw_priv || fw_sysfs_done(fw_priv)) {
- ret_count = -ENODEV;
- goto out;
- }
- if (offset > fw_priv->size) {
- ret_count = 0;
- goto out;
- }
- if (count > fw_priv->size - offset)
- count = fw_priv->size - offset;
-
- ret_count = count;
-
- if (fw_priv->data)
- firmware_rw_data(fw_priv, buffer, offset, count, true);
- else
- firmware_rw(fw_priv, buffer, offset, count, true);
-
-out:
- mutex_unlock(&fw_lock);
- return ret_count;
-}
-
-static int fw_realloc_pages(struct fw_sysfs *fw_sysfs, int min_size)
-{
- int err;
-
- err = fw_grow_paged_buf(fw_sysfs->fw_priv,
- PAGE_ALIGN(min_size) >> PAGE_SHIFT);
- if (err)
- fw_load_abort(fw_sysfs);
- return err;
-}
-
-/**
- * firmware_data_write() - write method for firmware
- * @filp: open sysfs file
- * @kobj: kobject for the device
- * @bin_attr: bin_attr structure
- * @buffer: buffer being written
- * @offset: buffer offset for write in total data store area
- * @count: buffer size
- *
- * Data written to the 'data' attribute will be later handed to
- * the driver as a firmware image.
- **/
-static ssize_t firmware_data_write(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buffer, loff_t offset, size_t count)
-{
- struct device *dev = kobj_to_dev(kobj);
- struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
- struct fw_priv *fw_priv;
- ssize_t retval;
-
- if (!capable(CAP_SYS_RAWIO))
- return -EPERM;
-
- mutex_lock(&fw_lock);
- fw_priv = fw_sysfs->fw_priv;
- if (!fw_priv || fw_sysfs_done(fw_priv)) {
- retval = -ENODEV;
- goto out;
- }
-
- if (fw_priv->data) {
- if (offset + count > fw_priv->allocated_size) {
- retval = -ENOMEM;
- goto out;
- }
- firmware_rw_data(fw_priv, buffer, offset, count, false);
- retval = count;
- } else {
- retval = fw_realloc_pages(fw_sysfs, offset + count);
- if (retval)
- goto out;
-
- retval = count;
- firmware_rw(fw_priv, buffer, offset, count, false);
- }
-
- fw_priv->size = max_t(size_t, offset + count, fw_priv->size);
-out:
- mutex_unlock(&fw_lock);
- return retval;
-}
-
-static struct bin_attribute firmware_attr_data = {
- .attr = { .name = "data", .mode = 0644 },
- .size = 0,
- .read = firmware_data_read,
- .write = firmware_data_write,
-};
-
-static struct attribute *fw_dev_attrs[] = {
- &dev_attr_loading.attr,
- NULL
-};
-
-static struct bin_attribute *fw_dev_bin_attrs[] = {
- &firmware_attr_data,
- NULL
-};
-
-static const struct attribute_group fw_dev_attr_group = {
- .attrs = fw_dev_attrs,
- .bin_attrs = fw_dev_bin_attrs,
-};
-
-static const struct attribute_group *fw_dev_attr_groups[] = {
- &fw_dev_attr_group,
- NULL
-};
-
-static struct fw_sysfs *
-fw_create_instance(struct firmware *firmware, const char *fw_name,
- struct device *device, u32 opt_flags)
-{
- struct fw_sysfs *fw_sysfs;
- struct device *f_dev;
-
- fw_sysfs = kzalloc(sizeof(*fw_sysfs), GFP_KERNEL);
- if (!fw_sysfs) {
- fw_sysfs = ERR_PTR(-ENOMEM);
- goto exit;
- }
-
- fw_sysfs->nowait = !!(opt_flags & FW_OPT_NOWAIT);
- fw_sysfs->fw = firmware;
- f_dev = &fw_sysfs->dev;
-
- device_initialize(f_dev);
- dev_set_name(f_dev, "%s", fw_name);
- f_dev->parent = device;
- f_dev->class = &firmware_class;
- f_dev->groups = fw_dev_attr_groups;
-exit:
- return fw_sysfs;
-}
-
/**
* fw_load_sysfs_fallback() - load a firmware via the sysfs fallback mechanism
* @fw_sysfs: firmware sysfs information for the firmware to load