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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.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c
new file mode 100644
index 0000000000..bf68e39478
--- /dev/null
+++ b/drivers/base/firmware_loader/fallback.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/types.h>
+#include <linux/kconfig.h>
+#include <linux/list.h>
+#include <linux/security.h>
+#include <linux/umh.h>
+#include <linux/sysctl.h>
+#include <linux/module.h>
+
+#include "fallback.h"
+#include "firmware.h"
+
+/*
+ * firmware fallback mechanism
+ */
+
+/*
+ * use small loading timeout for caching devices' firmware because all these
+ * firmware images have been loaded successfully at lease once, also system is
+ * ready for completing firmware loading now. The maximum size of firmware in
+ * current distributions is about 2M bytes, so 10 secs should be enough.
+ */
+void fw_fallback_set_cache_timeout(void)
+{
+ fw_fallback_config.old_timeout = __firmware_loading_timeout();
+ __fw_fallback_set_timeout(10);
+}
+
+/* Restores the timeout to the value last configured during normal operation */
+void fw_fallback_set_default_timeout(void)
+{
+ __fw_fallback_set_timeout(fw_fallback_config.old_timeout);
+}
+
+static long firmware_loading_timeout(void)
+{
+ return __firmware_loading_timeout() > 0 ?
+ __firmware_loading_timeout() * HZ : MAX_JIFFY_OFFSET;
+}
+
+static inline int fw_sysfs_wait_timeout(struct fw_priv *fw_priv, long timeout)
+{
+ return __fw_state_wait_common(fw_priv, timeout);
+}
+
+static LIST_HEAD(pending_fw_head);
+
+void kill_pending_fw_fallback_reqs(bool only_kill_custom)
+{
+ struct fw_priv *fw_priv;
+ struct fw_priv *next;
+
+ mutex_lock(&fw_lock);
+ list_for_each_entry_safe(fw_priv, next, &pending_fw_head,
+ pending_list) {
+ if (!fw_priv->need_uevent || !only_kill_custom)
+ __fw_load_abort(fw_priv);
+ }
+ mutex_unlock(&fw_lock);
+}
+
+/**
+ * fw_load_sysfs_fallback() - load a firmware via the sysfs fallback mechanism
+ * @fw_sysfs: firmware sysfs information for the firmware to load
+ * @timeout: timeout to wait for the load
+ *
+ * In charge of constructing a sysfs fallback interface for firmware loading.
+ **/
+static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs, long timeout)
+{
+ int retval = 0;
+ struct device *f_dev = &fw_sysfs->dev;
+ struct fw_priv *fw_priv = fw_sysfs->fw_priv;
+
+ /* fall back on userspace loading */
+ if (!fw_priv->data)
+ fw_priv->is_paged_buf = true;
+
+ dev_set_uevent_suppress(f_dev, true);
+
+ retval = device_add(f_dev);
+ if (retval) {
+ dev_err(f_dev, "%s: device_register failed\n", __func__);
+ goto err_put_dev;
+ }
+
+ mutex_lock(&fw_lock);
+ if (fw_state_is_aborted(fw_priv)) {
+ mutex_unlock(&fw_lock);
+ retval = -EINTR;
+ goto out;
+ }
+ list_add(&fw_priv->pending_list, &pending_fw_head);
+ mutex_unlock(&fw_lock);
+
+ if (fw_priv->opt_flags & FW_OPT_UEVENT) {
+ fw_priv->need_uevent = true;
+ dev_set_uevent_suppress(f_dev, false);
+ dev_dbg(f_dev, "firmware: requesting %s\n", fw_priv->fw_name);
+ kobject_uevent(&fw_sysfs->dev.kobj, KOBJ_ADD);
+ } else {
+ timeout = MAX_JIFFY_OFFSET;
+ }
+
+ retval = fw_sysfs_wait_timeout(fw_priv, timeout);
+ if (retval < 0 && retval != -ENOENT) {
+ mutex_lock(&fw_lock);
+ fw_load_abort(fw_sysfs);
+ mutex_unlock(&fw_lock);
+ }
+
+ if (fw_state_is_aborted(fw_priv)) {
+ if (retval == -ERESTARTSYS)
+ retval = -EINTR;
+ } else if (fw_priv->is_paged_buf && !fw_priv->data)
+ retval = -ENOMEM;
+
+out:
+ device_del(f_dev);
+err_put_dev:
+ put_device(f_dev);
+ return retval;
+}
+
+static int fw_load_from_user_helper(struct firmware *firmware,
+ const char *name, struct device *device,
+ u32 opt_flags)
+{
+ struct fw_sysfs *fw_sysfs;
+ long timeout;
+ int ret;
+
+ timeout = firmware_loading_timeout();
+ if (opt_flags & FW_OPT_NOWAIT) {
+ timeout = usermodehelper_read_lock_wait(timeout);
+ if (!timeout) {
+ dev_dbg(device, "firmware: %s loading timed out\n",
+ name);
+ return -EBUSY;
+ }
+ } else {
+ ret = usermodehelper_read_trylock();
+ if (WARN_ON(ret)) {
+ dev_err(device, "firmware: %s will not be loaded\n",
+ name);
+ return ret;
+ }
+ }
+
+ fw_sysfs = fw_create_instance(firmware, name, device, opt_flags);
+ if (IS_ERR(fw_sysfs)) {
+ ret = PTR_ERR(fw_sysfs);
+ goto out_unlock;
+ }
+
+ fw_sysfs->fw_priv = firmware->priv;
+ ret = fw_load_sysfs_fallback(fw_sysfs, timeout);
+
+ if (!ret)
+ ret = assign_fw(firmware, device);
+
+out_unlock:
+ usermodehelper_read_unlock();
+
+ return ret;
+}
+
+static bool fw_force_sysfs_fallback(u32 opt_flags)
+{
+ if (fw_fallback_config.force_sysfs_fallback)
+ return true;
+ if (!(opt_flags & FW_OPT_USERHELPER))
+ return false;
+ return true;
+}
+
+static bool fw_run_sysfs_fallback(u32 opt_flags)
+{
+ int ret;
+
+ if (fw_fallback_config.ignore_sysfs_fallback) {
+ pr_info_once("Ignoring firmware sysfs fallback due to sysctl knob\n");
+ return false;
+ }
+
+ if ((opt_flags & FW_OPT_NOFALLBACK_SYSFS))
+ return false;
+
+ /* Also permit LSMs and IMA to fail firmware sysfs fallback */
+ ret = security_kernel_load_data(LOADING_FIRMWARE, true);
+ if (ret < 0)
+ return false;
+
+ return fw_force_sysfs_fallback(opt_flags);
+}
+
+/**
+ * firmware_fallback_sysfs() - use the fallback mechanism to find firmware
+ * @fw: pointer to firmware image
+ * @name: name of firmware file to look for
+ * @device: device for which firmware is being loaded
+ * @opt_flags: options to control firmware loading behaviour, as defined by
+ * &enum fw_opt
+ * @ret: return value from direct lookup which triggered the fallback mechanism
+ *
+ * This function is called if direct lookup for the firmware failed, it enables
+ * a fallback mechanism through userspace by exposing a sysfs loading
+ * interface. Userspace is in charge of loading the firmware through the sysfs
+ * loading interface. This sysfs fallback mechanism may be disabled completely
+ * on a system by setting the proc sysctl value ignore_sysfs_fallback to true.
+ * If this is false we check if the internal API caller set the
+ * @FW_OPT_NOFALLBACK_SYSFS flag, if so it would also disable the fallback
+ * mechanism. A system may want to enforce the sysfs fallback mechanism at all
+ * times, it can do this by setting ignore_sysfs_fallback to false and
+ * force_sysfs_fallback to true.
+ * Enabling force_sysfs_fallback is functionally equivalent to build a kernel
+ * with CONFIG_FW_LOADER_USER_HELPER_FALLBACK.
+ **/
+int firmware_fallback_sysfs(struct firmware *fw, const char *name,
+ struct device *device,
+ u32 opt_flags,
+ int ret)
+{
+ if (!fw_run_sysfs_fallback(opt_flags))
+ return ret;
+
+ if (!(opt_flags & FW_OPT_NO_WARN))
+ dev_warn(device, "Falling back to sysfs fallback for: %s\n",
+ name);
+ else
+ dev_dbg(device, "Falling back to sysfs fallback for: %s\n",
+ name);
+ return fw_load_from_user_helper(fw, name, device, opt_flags);
+}