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-rw-r--r--drivers/base/Makefile4
-rw-r--r--drivers/base/firmware_fallback.c661
-rw-r--r--drivers/base/firmware_fallback.h61
-rw-r--r--drivers/base/firmware_fallback_table.c29
-rw-r--r--drivers/base/firmware_loader.c803
-rw-r--r--drivers/base/firmware_loader.h115
6 files changed, 874 insertions, 799 deletions
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index f261143fafbf..b946a408256d 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -5,7 +5,8 @@ obj-y := component.o core.o bus.o dd.o syscore.o \
driver.o class.o platform.o \
cpu.o firmware.o init.o map.o devres.o \
attribute_container.o transport_class.o \
- topology.o container.o property.o cacheinfo.o
+ topology.o container.o property.o cacheinfo.o \
+ firmware_fallback_table.o
obj-$(CONFIG_DEVTMPFS) += devtmpfs.o
obj-$(CONFIG_DMA_CMA) += dma-contiguous.o
obj-y += power/
@@ -14,6 +15,7 @@ obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
obj-$(CONFIG_ISA_BUS_API) += isa.o
obj-$(CONFIG_FW_LOADER) += firmware_class.o
firmware_class-objs := firmware_loader.o
+firmware_class-$(CONFIG_FW_LOADER_USER_HELPER) += firmware_fallback.o
obj-$(CONFIG_NUMA) += node.o
obj-$(CONFIG_MEMORY_HOTPLUG_SPARSE) += memory.o
ifeq ($(CONFIG_SYSFS),y)
diff --git a/drivers/base/firmware_fallback.c b/drivers/base/firmware_fallback.c
new file mode 100644
index 000000000000..47690207e0ee
--- /dev/null
+++ b/drivers/base/firmware_fallback.c
@@ -0,0 +1,661 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#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 "firmware_fallback.h"
+#include "firmware_loader.h"
+
+/*
+ * firmware fallback mechanism
+ */
+
+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
+ * 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 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 and disappearance of 'loading'
+ */
+ if (fw_sysfs_done(fw_priv))
+ return;
+
+ list_del_init(&fw_priv->pending_list);
+ 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)
+{
+ 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);
+}
+
+static ssize_t timeout_show(struct class *class, struct class_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%d\n", __firmware_loading_timeout());
+}
+
+/**
+ * firmware_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)
+{
+ return class_register(&firmware_class);
+}
+
+void unregister_sysfs_loader(void)
+{
+ 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 sprintf(buf, "%d\n", loading);
+}
+
+/* Some architectures don't have PAGE_KERNEL_RO */
+#ifndef PAGE_KERNEL_RO
+#define PAGE_KERNEL_RO PAGE_KERNEL
+#endif
+
+/* one pages buffer should be mapped/unmapped only once */
+static int map_fw_priv_pages(struct fw_priv *fw_priv)
+{
+ if (!fw_priv->is_paged_buf)
+ return 0;
+
+ vunmap(fw_priv->data);
+ fw_priv->data = vmap(fw_priv->pages, fw_priv->nr_pages, 0,
+ PAGE_KERNEL_RO);
+ if (!fw_priv->data)
+ return -ENOMEM;
+ return 0;
+}
+
+/**
+ * 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);
+ int i;
+
+ 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)) {
+ for (i = 0; i < fw_priv->nr_pages; i++)
+ __free_page(fw_priv->pages[i]);
+ vfree(fw_priv->pages);
+ fw_priv->pages = NULL;
+ fw_priv->page_array_size = 0;
+ fw_priv->nr_pages = 0;
+ 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 = map_fw_priv_pages(fw_priv);
+ if (rc)
+ dev_err(dev, "%s: map pages failed\n",
+ __func__);
+ else
+ rc = security_kernel_post_read_file(NULL,
+ fw_priv->data, fw_priv->size,
+ READING_FIRMWARE);
+
+ /*
+ * Same logic as fw_load_abort, only the DONE bit
+ * is ignored and we set ABORT only on failure.
+ */
+ list_del_init(&fw_priv->pending_list);
+ 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)
+{
+ struct fw_priv *fw_priv= fw_sysfs->fw_priv;
+ int pages_needed = PAGE_ALIGN(min_size) >> PAGE_SHIFT;
+
+ /* If the array of pages is too small, grow it... */
+ if (fw_priv->page_array_size < pages_needed) {
+ int new_array_size = max(pages_needed,
+ fw_priv->page_array_size * 2);
+ struct page **new_pages;
+
+ new_pages = vmalloc(new_array_size * sizeof(void *));
+ if (!new_pages) {
+ fw_load_abort(fw_sysfs);
+ return -ENOMEM;
+ }
+ memcpy(new_pages, fw_priv->pages,
+ fw_priv->page_array_size * sizeof(void *));
+ memset(&new_pages[fw_priv->page_array_size], 0, sizeof(void *) *
+ (new_array_size - fw_priv->page_array_size));
+ vfree(fw_priv->pages);
+ fw_priv->pages = new_pages;
+ fw_priv->page_array_size = new_array_size;
+ }
+
+ while (fw_priv->nr_pages < pages_needed) {
+ fw_priv->pages[fw_priv->nr_pages] =
+ alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
+
+ if (!fw_priv->pages[fw_priv->nr_pages]) {
+ fw_load_abort(fw_sysfs);
+ return -ENOMEM;
+ }
+ fw_priv->nr_pages++;
+ }
+ return 0;
+}
+
+/**
+ * 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, unsigned int 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;
+}
+
+/* load a firmware via user helper */
+static int _request_firmware_load(struct fw_sysfs *fw_sysfs,
+ unsigned int opt_flags, 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);
+ list_add(&fw_priv->pending_list, &pending_fw_head);
+ mutex_unlock(&fw_lock);
+
+ if (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) {
+ 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
+ retval = -EAGAIN;
+ } else if (fw_priv->is_paged_buf && !fw_priv->data)
+ retval = -ENOMEM;
+
+ 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,
+ unsigned int 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 = _request_firmware_load(fw_sysfs, opt_flags, timeout);
+
+ if (!ret)
+ ret = assign_fw(firmware, device, opt_flags);
+
+out_unlock:
+ usermodehelper_read_unlock();
+
+ return ret;
+}
+
+static bool fw_force_sysfs_fallback(unsigned int 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(unsigned int opt_flags)
+{
+ if ((opt_flags & FW_OPT_NOFALLBACK))
+ return false;
+
+ return fw_force_sysfs_fallback(opt_flags);
+}
+
+int fw_sysfs_fallback(struct firmware *fw, const char *name,
+ struct device *device,
+ unsigned int opt_flags,
+ int ret)
+{
+ if (!fw_run_sysfs_fallback(opt_flags))
+ return ret;
+
+ dev_warn(device, "Falling back to user helper\n");
+ return fw_load_from_user_helper(fw, name, device, opt_flags);
+}
diff --git a/drivers/base/firmware_fallback.h b/drivers/base/firmware_fallback.h
new file mode 100644
index 000000000000..550498c7fa4c
--- /dev/null
+++ b/drivers/base/firmware_fallback.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __FIRMWARE_FALLBACK_H
+#define __FIRMWARE_FALLBACK_H
+
+#include <linux/firmware.h>
+#include <linux/device.h>
+
+/**
+ * struct firmware_fallback_config - firmware fallback configuratioon settings
+ *
+ * Helps describe and fine tune the fallback mechanism.
+ *
+ * @force_sysfs_fallback: force the sysfs fallback mechanism to be used
+ * as if one had enabled CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y.
+ * @old_timeout: for internal use
+ * @loading_timeout: the timeout to wait for the fallback mechanism before
+ * giving up, in seconds.
+ */
+struct firmware_fallback_config {
+ const bool force_sysfs_fallback;
+ int old_timeout;
+ int loading_timeout;
+};
+
+#ifdef CONFIG_FW_LOADER_USER_HELPER
+int fw_sysfs_fallback(struct firmware *fw, const char *name,
+ struct device *device,
+ unsigned int opt_flags,
+ int ret);
+void kill_pending_fw_fallback_reqs(bool only_kill_custom);
+
+void fw_fallback_set_cache_timeout(void);
+void fw_fallback_set_default_timeout(void);
+
+int register_sysfs_loader(void);
+void unregister_sysfs_loader(void);
+#else /* CONFIG_FW_LOADER_USER_HELPER */
+static inline int fw_sysfs_fallback(struct firmware *fw, const char *name,
+ struct device *device,
+ unsigned int opt_flags,
+ int ret)
+{
+ /* Keep carrying over the same error */
+ return ret;
+}
+
+static inline void kill_pending_fw_fallback_reqs(bool only_kill_custom) { }
+static inline void fw_fallback_set_cache_timeout(void) { }
+static inline void fw_fallback_set_default_timeout(void) { }
+
+static inline int register_sysfs_loader(void)
+{
+ return 0;
+}
+
+static inline void unregister_sysfs_loader(void)
+{
+}
+#endif /* CONFIG_FW_LOADER_USER_HELPER */
+
+#endif /* __FIRMWARE_FALLBACK_H */
diff --git a/drivers/base/firmware_fallback_table.c b/drivers/base/firmware_fallback_table.c
new file mode 100644
index 000000000000..53cc4e492520
--- /dev/null
+++ b/drivers/base/firmware_fallback_table.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#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 "firmware_fallback.h"
+#include "firmware_loader.h"
+
+/*
+ * firmware fallback configuration table
+ */
+
+/* Module or buit-in */
+#ifdef CONFIG_FW_LOADER_USER_HELPER
+
+struct firmware_fallback_config fw_fallback_config = {
+ .force_sysfs_fallback = IS_ENABLED(CONFIG_FW_LOADER_USER_HELPER_FALLBACK),
+ .loading_timeout = 60,
+ .old_timeout = 60,
+};
+EXPORT_SYMBOL_GPL(fw_fallback_config);
+
+#endif
diff --git a/drivers/base/firmware_loader.c b/drivers/base/firmware_loader.c
index 9757f9fff01e..21dd31ef08ae 100644
--- a/drivers/base/firmware_loader.c
+++ b/drivers/base/firmware_loader.c
@@ -37,36 +37,13 @@
#include <generated/utsrelease.h>
#include "base.h"
+#include "firmware_loader.h"
+#include "firmware_fallback.h"
MODULE_AUTHOR("Manuel Estrada Sainz");
MODULE_DESCRIPTION("Multi purpose firmware loading support");
MODULE_LICENSE("GPL");
-enum fw_status {
- FW_STATUS_UNKNOWN,
- FW_STATUS_LOADING,
- FW_STATUS_DONE,
- FW_STATUS_ABORTED,
-};
-
-/*
- * Concurrent request_firmware() for the same firmware need to be
- * serialized. struct fw_state is simple state machine which hold the
- * state of the firmware loading.
- */
-struct fw_state {
- struct completion completion;
- enum fw_status status;
-};
-
-/* firmware behavior options */
-#define FW_OPT_UEVENT (1U << 0)
-#define FW_OPT_NOWAIT (1U << 1)
-#define FW_OPT_USERHELPER (1U << 2)
-#define FW_OPT_NO_WARN (1U << 3)
-#define FW_OPT_NOCACHE (1U << 4)
-#define FW_OPT_NOFALLBACK (1U << 5)
-
struct firmware_cache {
/* firmware_buf instance will be added into the below list */
spinlock_t lock;
@@ -89,25 +66,6 @@ struct firmware_cache {
#endif
};
-struct fw_priv {
- struct kref ref;
- struct list_head list;
- struct firmware_cache *fwc;
- struct fw_state fw_st;
- void *data;
- size_t size;
- size_t allocated_size;
-#ifdef CONFIG_FW_LOADER_USER_HELPER
- bool is_paged_buf;
- bool need_uevent;
- struct page **pages;
- int nr_pages;
- int page_array_size;
- struct list_head pending_list;
-#endif
- const char *fw_name;
-};
-
struct fw_cache_entry {
struct list_head list;
const char *name;
@@ -128,7 +86,7 @@ static inline struct fw_priv *to_fw_priv(struct kref *ref)
/* fw_lock could be moved to 'struct fw_sysfs' but since it is just
* guarding for corner cases a global lock should be OK */
-static DEFINE_MUTEX(fw_lock);
+DEFINE_MUTEX(fw_lock);
static struct firmware_cache fw_cache;
@@ -199,142 +157,11 @@ static void fw_state_init(struct fw_priv *fw_priv)
fw_st->status = FW_STATUS_UNKNOWN;
}
-static int __fw_state_wait_common(struct fw_priv *fw_priv, long timeout)
-{
- struct fw_state *fw_st = &fw_priv->fw_st;
- long ret;
-
- ret = wait_for_completion_killable_timeout(&fw_st->completion, timeout);
- if (ret != 0 && fw_st->status == FW_STATUS_ABORTED)
- return -ENOENT;
- if (!ret)
- return -ETIMEDOUT;
-
- return ret < 0 ? ret : 0;
-}
-
-static void __fw_state_set(struct fw_priv *fw_priv,
- enum fw_status status)
-{
- struct fw_state *fw_st = &fw_priv->fw_st;
-
- WRITE_ONCE(fw_st->status, status);
-
- if (status == FW_STATUS_DONE || status == FW_STATUS_ABORTED)
- complete_all(&fw_st->completion);
-}
-
-static inline void fw_state_start(struct fw_priv *fw_priv)
-{
- __fw_state_set(fw_priv, FW_STATUS_LOADING);
-}
-
-static inline void fw_state_done(struct fw_priv *fw_priv)
-{
- __fw_state_set(fw_priv, FW_STATUS_DONE);
-}
-
-static inline void fw_state_aborted(struct fw_priv *fw_priv)
-{
- __fw_state_set(fw_priv, FW_STATUS_ABORTED);
-}
-
static inline int fw_state_wait(struct fw_priv *fw_priv)
{
return __fw_state_wait_common(fw_priv, MAX_SCHEDULE_TIMEOUT);
}
-static bool __fw_state_check(struct fw_priv *fw_priv,
- enum fw_status status)
-{
- struct fw_state *fw_st = &fw_priv->fw_st;
-
- return fw_st->status == status;
-}
-
-static inline bool fw_state_is_aborted(struct fw_priv *fw_priv)
-{
- return __fw_state_check(fw_priv, FW_STATUS_ABORTED);
-}
-
-#ifdef CONFIG_FW_LOADER_USER_HELPER
-
-/**
- * struct firmware_fallback_config - firmware fallback configuratioon settings
- *
- * Helps describe and fine tune the fallback mechanism.
- *
- * @force_sysfs_fallback: force the sysfs fallback mechanism to be used
- * as if one had enabled CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y.
- * @old_timeout: for internal use
- * @loading_timeout: the timeout to wait for the fallback mechanism before
- * giving up, in seconds.
- */
-struct firmware_fallback_config {
- const bool force_sysfs_fallback;
- int old_timeout;
- int loading_timeout;
-};
-
-static struct firmware_fallback_config fw_fallback_config = {
- .force_sysfs_fallback = IS_ENABLED(CONFIG_FW_LOADER_USER_HELPER_FALLBACK),
- .loading_timeout = 60,
- .old_timeout = 60,
-};
-
-/* 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;
-}
-
-static inline long firmware_loading_timeout(void)
-{
- return __firmware_loading_timeout() > 0 ?
- __firmware_loading_timeout() * HZ : MAX_JIFFY_OFFSET;
-}
-
-/*
- * 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.
- */
-static 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 */
-static void fw_fallback_set_default_timeout(void)
-{
- __fw_fallback_set_timeout(fw_fallback_config.old_timeout);
-}
-
-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);
-}
-
-#endif /* CONFIG_FW_LOADER_USER_HELPER */
-
static int fw_cache_piggyback_on_request(const char *name);
static struct fw_priv *__allocate_fw_priv(const char *fw_name,
@@ -600,8 +427,8 @@ static int fw_add_devm_name(struct device *dev, const char *name)
}
#endif
-static int assign_fw(struct firmware *fw, struct device *device,
- unsigned int opt_flags)
+int assign_fw(struct firmware *fw, struct device *device,
+ unsigned int opt_flags)
{
struct fw_priv *fw_priv = fw->priv;
@@ -639,626 +466,6 @@ static int assign_fw(struct firmware *fw, struct device *device,
return 0;
}
-/*
- * user-mode helper code
- */
-#ifdef CONFIG_FW_LOADER_USER_HELPER
-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 and disappearance of 'loading'
- */
- if (fw_sysfs_done(fw_priv))
- return;
-
- list_del_init(&fw_priv->pending_list);
- 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);
-
-static 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);
-}
-
-static ssize_t timeout_show(struct class *class, struct class_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%d\n", __firmware_loading_timeout());
-}
-
-/**
- * firmware_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,
-};
-
-static inline int register_sysfs_loader(void)
-{
- return class_register(&firmware_class);
-}
-
-static inline void unregister_sysfs_loader(void)
-{
- 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 sprintf(buf, "%d\n", loading);
-}
-
-/* Some architectures don't have PAGE_KERNEL_RO */
-#ifndef PAGE_KERNEL_RO
-#define PAGE_KERNEL_RO PAGE_KERNEL
-#endif
-
-/* one pages buffer should be mapped/unmapped only once */
-static int map_fw_priv_pages(struct fw_priv *fw_priv)
-{
- if (!fw_priv->is_paged_buf)
- return 0;
-
- vunmap(fw_priv->data);
- fw_priv->data = vmap(fw_priv->pages, fw_priv->nr_pages, 0,
- PAGE_KERNEL_RO);
- if (!fw_priv->data)
- return -ENOMEM;
- return 0;
-}
-
-/**
- * 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);
- int i;
-
- 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)) {
- for (i = 0; i < fw_priv->nr_pages; i++)
- __free_page(fw_priv->pages[i]);
- vfree(fw_priv->pages);
- fw_priv->pages = NULL;
- fw_priv->page_array_size = 0;
- fw_priv->nr_pages = 0;
- 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 = map_fw_priv_pages(fw_priv);
- if (rc)
- dev_err(dev, "%s: map pages failed\n",
- __func__);
- else
- rc = security_kernel_post_read_file(NULL,
- fw_priv->data, fw_priv->size,
- READING_FIRMWARE);
-
- /*
- * Same logic as fw_load_abort, only the DONE bit
- * is ignored and we set ABORT only on failure.
- */
- list_del_init(&fw_priv->pending_list);
- 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)
-{
- struct fw_priv *fw_priv= fw_sysfs->fw_priv;
- int pages_needed = PAGE_ALIGN(min_size) >> PAGE_SHIFT;
-
- /* If the array of pages is too small, grow it... */
- if (fw_priv->page_array_size < pages_needed) {
- int new_array_size = max(pages_needed,
- fw_priv->page_array_size * 2);
- struct page **new_pages;
-
- new_pages = vmalloc(new_array_size * sizeof(void *));
- if (!new_pages) {
- fw_load_abort(fw_sysfs);
- return -ENOMEM;
- }
- memcpy(new_pages, fw_priv->pages,
- fw_priv->page_array_size * sizeof(void *));
- memset(&new_pages[fw_priv->page_array_size], 0, sizeof(void *) *
- (new_array_size - fw_priv->page_array_size));
- vfree(fw_priv->pages);
- fw_priv->pages = new_pages;
- fw_priv->page_array_size = new_array_size;
- }
-
- while (fw_priv->nr_pages < pages_needed) {
- fw_priv->pages[fw_priv->nr_pages] =
- alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
-
- if (!fw_priv->pages[fw_priv->nr_pages]) {
- fw_load_abort(fw_sysfs);
- return -ENOMEM;
- }
- fw_priv->nr_pages++;
- }
- return 0;
-}
-
-/**
- * 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, unsigned int 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;
-}
-
-/* load a firmware via user helper */
-static int _request_firmware_load(struct fw_sysfs *fw_sysfs,
- unsigned int opt_flags, 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);
- list_add(&fw_priv->pending_list, &pending_fw_head);
- mutex_unlock(&fw_lock);
-
- if (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) {
- 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
- retval = -EAGAIN;
- } else if (fw_priv->is_paged_buf && !fw_priv->data)
- retval = -ENOMEM;
-
- 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,
- unsigned int 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 = _request_firmware_load(fw_sysfs, opt_flags, timeout);
-
- if (!ret)
- ret = assign_fw(firmware, device, opt_flags);
-
-out_unlock:
- usermodehelper_read_unlock();
-
- return ret;
-}
-
-static bool fw_force_sysfs_fallback(unsigned int 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(unsigned int opt_flags)
-{
- if ((opt_flags & FW_OPT_NOFALLBACK))
- return false;
-
- return fw_force_sysfs_fallback(opt_flags);
-}
-
-static int fw_sysfs_fallback(struct firmware *fw, const char *name,
- struct device *device,
- unsigned int opt_flags,
- int ret)
-{
- if (!fw_run_sysfs_fallback(opt_flags))
- return ret;
-
- dev_warn(device, "Falling back to user helper\n");
- return fw_load_from_user_helper(fw, name, device, opt_flags);
-}
-#else /* CONFIG_FW_LOADER_USER_HELPER */
-static int fw_sysfs_fallback(struct firmware *fw, const char *name,
- struct device *device,
- unsigned int opt_flags,
- int ret)
-{
- /* Keep carrying over the same error */
- return ret;
-}
-
-static inline void kill_pending_fw_fallback_reqs(bool only_kill_custom) { }
-static inline void fw_fallback_set_cache_timeout(void) { }
-static inline void fw_fallback_set_default_timeout(void) { }
-
-static inline int register_sysfs_loader(void)
-{
- return 0;
-}
-
-static inline void unregister_sysfs_loader(void)
-{
-}
-
-#endif /* CONFIG_FW_LOADER_USER_HELPER */
-
/* prepare firmware and firmware_buf structs;
* return 0 if a firmware is already assigned, 1 if need to load one,
* or a negative error code
diff --git a/drivers/base/firmware_loader.h b/drivers/base/firmware_loader.h
new file mode 100644
index 000000000000..64acbb1a392c
--- /dev/null
+++ b/drivers/base/firmware_loader.h
@@ -0,0 +1,115 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __FIRMWARE_LOADER_H
+#define __FIRMWARE_LOADER_H
+
+#include <linux/firmware.h>
+#include <linux/types.h>
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/completion.h>
+
+#include <generated/utsrelease.h>
+
+/* firmware behavior options */
+#define FW_OPT_UEVENT (1U << 0)
+#define FW_OPT_NOWAIT (1U << 1)
+#define FW_OPT_USERHELPER (1U << 2)
+#define FW_OPT_NO_WARN (1U << 3)
+#define FW_OPT_NOCACHE (1U << 4)
+#define FW_OPT_NOFALLBACK (1U << 5)
+
+enum fw_status {
+ FW_STATUS_UNKNOWN,
+ FW_STATUS_LOADING,
+ FW_STATUS_DONE,
+ FW_STATUS_ABORTED,
+};
+
+/*
+ * Concurrent request_firmware() for the same firmware need to be
+ * serialized. struct fw_state is simple state machine which hold the
+ * state of the firmware loading.
+ */
+struct fw_state {
+ struct completion completion;
+ enum fw_status status;
+};
+
+struct fw_priv {
+ struct kref ref;
+ struct list_head list;
+ struct firmware_cache *fwc;
+ struct fw_state fw_st;
+ void *data;
+ size_t size;
+ size_t allocated_size;
+#ifdef CONFIG_FW_LOADER_USER_HELPER
+ bool is_paged_buf;
+ bool need_uevent;
+ struct page **pages;
+ int nr_pages;
+ int page_array_size;
+ struct list_head pending_list;
+#endif
+ const char *fw_name;
+};
+
+extern struct mutex fw_lock;
+
+static inline bool __fw_state_check(struct fw_priv *fw_priv,
+ enum fw_status status)
+{
+ struct fw_state *fw_st = &fw_priv->fw_st;
+
+ return fw_st->status == status;
+}
+
+static inline int __fw_state_wait_common(struct fw_priv *fw_priv, long timeout)
+{
+ struct fw_state *fw_st = &fw_priv->fw_st;
+ long ret;
+
+ ret = wait_for_completion_killable_timeout(&fw_st->completion, timeout);
+ if (ret != 0 && fw_st->status == FW_STATUS_ABORTED)
+ return -ENOENT;
+ if (!ret)
+ return -ETIMEDOUT;
+
+ return ret < 0 ? ret : 0;
+}
+
+static inline void __fw_state_set(struct fw_priv *fw_priv,
+ enum fw_status status)
+{
+ struct fw_state *fw_st = &fw_priv->fw_st;
+
+ WRITE_ONCE(fw_st->status, status);
+
+ if (status == FW_STATUS_DONE || status == FW_STATUS_ABORTED)
+ complete_all(&fw_st->completion);
+}
+
+static inline void fw_state_aborted(struct fw_priv *fw_priv)
+{
+ __fw_state_set(fw_priv, FW_STATUS_ABORTED);
+}
+
+static inline bool fw_state_is_aborted(struct fw_priv *fw_priv)
+{
+ return __fw_state_check(fw_priv, FW_STATUS_ABORTED);
+}
+
+static inline void fw_state_start(struct fw_priv *fw_priv)
+{
+ __fw_state_set(fw_priv, FW_STATUS_LOADING);
+}
+
+static inline void fw_state_done(struct fw_priv *fw_priv)
+{
+ __fw_state_set(fw_priv, FW_STATUS_DONE);
+}
+
+int assign_fw(struct firmware *fw, struct device *device,
+ unsigned int opt_flags);
+
+#endif /* __FIRMWARE_LOADER_H */