Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1188 insertions, 0 deletions

diff --git a/lib/test_firmware.c b/lib/test_firmware.c
new file mode 100644
index 000000000..25dc9eb6c
--- /dev/null
+++ b/lib/test_firmware.c
@@ -0,0 +1,1188 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * This module provides an interface to trigger and test firmware loading.
+ *
+ * It is designed to be used for basic evaluation of the firmware loading
+ * subsystem (for example when validating firmware verification). It lacks
+ * any extra dependencies, and will not normally be loaded by the system
+ * unless explicitly requested by name.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/completion.h>
+#include <linux/firmware.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/delay.h>
+#include <linux/kstrtox.h>
+#include <linux/kthread.h>
+#include <linux/vmalloc.h>
+#include <linux/efi_embedded_fw.h>
+
+MODULE_IMPORT_NS(TEST_FIRMWARE);
+
+#define TEST_FIRMWARE_NAME	"test-firmware.bin"
+#define TEST_FIRMWARE_NUM_REQS	4
+#define TEST_FIRMWARE_BUF_SIZE	SZ_1K
+
+static DEFINE_MUTEX(test_fw_mutex);
+static const struct firmware *test_firmware;
+
+struct test_batched_req {
+	u8 idx;
+	int rc;
+	bool sent;
+	const struct firmware *fw;
+	const char *name;
+	const char *fw_buf;
+	struct completion completion;
+	struct task_struct *task;
+	struct device *dev;
+};
+
+/**
+ * test_config - represents configuration for the test for different triggers
+ *
+ * @name: the name of the firmware file to look for
+ * @into_buf: when the into_buf is used if this is true
+ *	request_firmware_into_buf() will be used instead.
+ * @buf_size: size of buf to allocate when into_buf is true
+ * @file_offset: file offset to request when calling request_firmware_into_buf
+ * @partial: partial read opt when calling request_firmware_into_buf
+ * @sync_direct: when the sync trigger is used if this is true
+ *	request_firmware_direct() will be used instead.
+ * @send_uevent: whether or not to send a uevent for async requests
+ * @num_requests: number of requests to try per test case. This is trigger
+ *	specific.
+ * @reqs: stores all requests information
+ * @read_fw_idx: index of thread from which we want to read firmware results
+ *	from through the read_fw trigger.
+ * @test_result: a test may use this to collect the result from the call
+ *	of the request_firmware*() calls used in their tests. In order of
+ *	priority we always keep first any setup error. If no setup errors were
+ *	found then we move on to the first error encountered while running the
+ *	API. Note that for async calls this typically will be a successful
+ *	result (0) unless of course you've used bogus parameters, or the system
+ *	is out of memory.  In the async case the callback is expected to do a
+ *	bit more homework to figure out what happened, unfortunately the only
+ *	information passed today on error is the fact that no firmware was
+ *	found so we can only assume -ENOENT on async calls if the firmware is
+ *	NULL.
+ *
+ *	Errors you can expect:
+ *
+ *	API specific:
+ *
+ *	0:		success for sync, for async it means request was sent
+ *	-EINVAL:	invalid parameters or request
+ *	-ENOENT:	files not found
+ *
+ *	System environment:
+ *
+ *	-ENOMEM:	memory pressure on system
+ *	-ENODEV:	out of number of devices to test
+ *	-EINVAL:	an unexpected error has occurred
+ * @req_firmware: if @sync_direct is true this is set to
+ *	request_firmware_direct(), otherwise request_firmware()
+ */
+struct test_config {
+	char *name;
+	bool into_buf;
+	size_t buf_size;
+	size_t file_offset;
+	bool partial;
+	bool sync_direct;
+	bool send_uevent;
+	u8 num_requests;
+	u8 read_fw_idx;
+
+	/*
+	 * These below don't belong her but we'll move them once we create
+	 * a struct fw_test_device and stuff the misc_dev under there later.
+	 */
+	struct test_batched_req *reqs;
+	int test_result;
+	int (*req_firmware)(const struct firmware **fw, const char *name,
+			    struct device *device);
+};
+
+static struct test_config *test_fw_config;
+
+static ssize_t test_fw_misc_read(struct file *f, char __user *buf,
+				 size_t size, loff_t *offset)
+{
+	ssize_t rc = 0;
+
+	mutex_lock(&test_fw_mutex);
+	if (test_firmware)
+		rc = simple_read_from_buffer(buf, size, offset,
+					     test_firmware->data,
+					     test_firmware->size);
+	mutex_unlock(&test_fw_mutex);
+	return rc;
+}
+
+static const struct file_operations test_fw_fops = {
+	.owner          = THIS_MODULE,
+	.read           = test_fw_misc_read,
+};
+
+static void __test_release_all_firmware(void)
+{
+	struct test_batched_req *req;
+	u8 i;
+
+	if (!test_fw_config->reqs)
+		return;
+
+	for (i = 0; i < test_fw_config->num_requests; i++) {
+		req = &test_fw_config->reqs[i];
+		if (req->fw) {
+			if (req->fw_buf) {
+				kfree_const(req->fw_buf);
+				req->fw_buf = NULL;
+			}
+			release_firmware(req->fw);
+			req->fw = NULL;
+		}
+	}
+
+	vfree(test_fw_config->reqs);
+	test_fw_config->reqs = NULL;
+}
+
+static void test_release_all_firmware(void)
+{
+	mutex_lock(&test_fw_mutex);
+	__test_release_all_firmware();
+	mutex_unlock(&test_fw_mutex);
+}
+
+
+static void __test_firmware_config_free(void)
+{
+	__test_release_all_firmware();
+	kfree_const(test_fw_config->name);
+	test_fw_config->name = NULL;
+}
+
+/*
+ * XXX: move to kstrncpy() once merged.
+ *
+ * Users should use kfree_const() when freeing these.
+ */
+static int __kstrncpy(char **dst, const char *name, size_t count, gfp_t gfp)
+{
+	*dst = kstrndup(name, count, gfp);
+	if (!*dst)
+		return -ENOMEM;
+	return count;
+}
+
+static int __test_firmware_config_init(void)
+{
+	int ret;
+
+	ret = __kstrncpy(&test_fw_config->name, TEST_FIRMWARE_NAME,
+			 strlen(TEST_FIRMWARE_NAME), GFP_KERNEL);
+	if (ret < 0)
+		goto out;
+
+	test_fw_config->num_requests = TEST_FIRMWARE_NUM_REQS;
+	test_fw_config->send_uevent = true;
+	test_fw_config->into_buf = false;
+	test_fw_config->buf_size = TEST_FIRMWARE_BUF_SIZE;
+	test_fw_config->file_offset = 0;
+	test_fw_config->partial = false;
+	test_fw_config->sync_direct = false;
+	test_fw_config->req_firmware = request_firmware;
+	test_fw_config->test_result = 0;
+	test_fw_config->reqs = NULL;
+
+	return 0;
+
+out:
+	__test_firmware_config_free();
+	return ret;
+}
+
+static ssize_t reset_store(struct device *dev,
+			   struct device_attribute *attr,
+			   const char *buf, size_t count)
+{
+	int ret;
+
+	mutex_lock(&test_fw_mutex);
+
+	__test_firmware_config_free();
+
+	ret = __test_firmware_config_init();
+	if (ret < 0) {
+		ret = -ENOMEM;
+		pr_err("could not alloc settings for config trigger: %d\n",
+		       ret);
+		goto out;
+	}
+
+	pr_info("reset\n");
+	ret = count;
+
+out:
+	mutex_unlock(&test_fw_mutex);
+
+	return ret;
+}
+static DEVICE_ATTR_WO(reset);
+
+static ssize_t config_show(struct device *dev,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	int len = 0;
+
+	mutex_lock(&test_fw_mutex);
+
+	len += scnprintf(buf, PAGE_SIZE - len,
+			"Custom trigger configuration for: %s\n",
+			dev_name(dev));
+
+	if (test_fw_config->name)
+		len += scnprintf(buf + len, PAGE_SIZE - len,
+				"name:\t%s\n",
+				test_fw_config->name);
+	else
+		len += scnprintf(buf + len, PAGE_SIZE - len,
+				"name:\tEMTPY\n");
+
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			"num_requests:\t%u\n", test_fw_config->num_requests);
+
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			"send_uevent:\t\t%s\n",
+			test_fw_config->send_uevent ?
+			"FW_ACTION_HOTPLUG" :
+			"FW_ACTION_NOHOTPLUG");
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			"into_buf:\t\t%s\n",
+			test_fw_config->into_buf ? "true" : "false");
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			"buf_size:\t%zu\n", test_fw_config->buf_size);
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			"file_offset:\t%zu\n", test_fw_config->file_offset);
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			"partial:\t\t%s\n",
+			test_fw_config->partial ? "true" : "false");
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			"sync_direct:\t\t%s\n",
+			test_fw_config->sync_direct ? "true" : "false");
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			"read_fw_idx:\t%u\n", test_fw_config->read_fw_idx);
+
+	mutex_unlock(&test_fw_mutex);
+
+	return len;
+}
+static DEVICE_ATTR_RO(config);
+
+static ssize_t config_name_store(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t count)
+{
+	int ret;
+
+	mutex_lock(&test_fw_mutex);
+	kfree_const(test_fw_config->name);
+	ret = __kstrncpy(&test_fw_config->name, buf, count, GFP_KERNEL);
+	mutex_unlock(&test_fw_mutex);
+
+	return ret;
+}
+
+/*
+ * As per sysfs_kf_seq_show() the buf is max PAGE_SIZE.
+ */
+static ssize_t config_test_show_str(char *dst,
+				    char *src)
+{
+	int len;
+
+	mutex_lock(&test_fw_mutex);
+	len = snprintf(dst, PAGE_SIZE, "%s\n", src);
+	mutex_unlock(&test_fw_mutex);
+
+	return len;
+}
+
+static inline int __test_dev_config_update_bool(const char *buf, size_t size,
+				       bool *cfg)
+{
+	int ret;
+
+	if (kstrtobool(buf, cfg) < 0)
+		ret = -EINVAL;
+	else
+		ret = size;
+
+	return ret;
+}
+
+static int test_dev_config_update_bool(const char *buf, size_t size,
+				       bool *cfg)
+{
+	int ret;
+
+	mutex_lock(&test_fw_mutex);
+	ret = __test_dev_config_update_bool(buf, size, cfg);
+	mutex_unlock(&test_fw_mutex);
+
+	return ret;
+}
+
+static ssize_t test_dev_config_show_bool(char *buf, bool val)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", val);
+}
+
+static int __test_dev_config_update_size_t(
+					 const char *buf,
+					 size_t size,
+					 size_t *cfg)
+{
+	int ret;
+	long new;
+
+	ret = kstrtol(buf, 10, &new);
+	if (ret)
+		return ret;
+
+	*(size_t *)cfg = new;
+
+	/* Always return full write size even if we didn't consume all */
+	return size;
+}
+
+static ssize_t test_dev_config_show_size_t(char *buf, size_t val)
+{
+	return snprintf(buf, PAGE_SIZE, "%zu\n", val);
+}
+
+static ssize_t test_dev_config_show_int(char *buf, int val)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", val);
+}
+
+static int __test_dev_config_update_u8(const char *buf, size_t size, u8 *cfg)
+{
+	u8 val;
+	int ret;
+
+	ret = kstrtou8(buf, 10, &val);
+	if (ret)
+		return ret;
+
+	*(u8 *)cfg = val;
+
+	/* Always return full write size even if we didn't consume all */
+	return size;
+}
+
+static int test_dev_config_update_u8(const char *buf, size_t size, u8 *cfg)
+{
+	int ret;
+
+	mutex_lock(&test_fw_mutex);
+	ret = __test_dev_config_update_u8(buf, size, cfg);
+	mutex_unlock(&test_fw_mutex);
+
+	return ret;
+}
+
+static ssize_t test_dev_config_show_u8(char *buf, u8 val)
+{
+	return snprintf(buf, PAGE_SIZE, "%u\n", val);
+}
+
+static ssize_t config_name_show(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	return config_test_show_str(buf, test_fw_config->name);
+}
+static DEVICE_ATTR_RW(config_name);
+
+static ssize_t config_num_requests_store(struct device *dev,
+					 struct device_attribute *attr,
+					 const char *buf, size_t count)
+{
+	int rc;
+
+	mutex_lock(&test_fw_mutex);
+	if (test_fw_config->reqs) {
+		pr_err("Must call release_all_firmware prior to changing config\n");
+		rc = -EINVAL;
+		mutex_unlock(&test_fw_mutex);
+		goto out;
+	}
+
+	rc = __test_dev_config_update_u8(buf, count,
+					 &test_fw_config->num_requests);
+	mutex_unlock(&test_fw_mutex);
+
+out:
+	return rc;
+}
+
+static ssize_t config_num_requests_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	return test_dev_config_show_u8(buf, test_fw_config->num_requests);
+}
+static DEVICE_ATTR_RW(config_num_requests);
+
+static ssize_t config_into_buf_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	return test_dev_config_update_bool(buf,
+					   count,
+					   &test_fw_config->into_buf);
+}
+
+static ssize_t config_into_buf_show(struct device *dev,
+				    struct device_attribute *attr,
+				    char *buf)
+{
+	return test_dev_config_show_bool(buf, test_fw_config->into_buf);
+}
+static DEVICE_ATTR_RW(config_into_buf);
+
+static ssize_t config_buf_size_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	int rc;
+
+	mutex_lock(&test_fw_mutex);
+	if (test_fw_config->reqs) {
+		pr_err("Must call release_all_firmware prior to changing config\n");
+		rc = -EINVAL;
+		mutex_unlock(&test_fw_mutex);
+		goto out;
+	}
+
+	rc = __test_dev_config_update_size_t(buf, count,
+					     &test_fw_config->buf_size);
+	mutex_unlock(&test_fw_mutex);
+
+out:
+	return rc;
+}
+
+static ssize_t config_buf_size_show(struct device *dev,
+				    struct device_attribute *attr,
+				    char *buf)
+{
+	return test_dev_config_show_size_t(buf, test_fw_config->buf_size);
+}
+static DEVICE_ATTR_RW(config_buf_size);
+
+static ssize_t config_file_offset_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	int rc;
+
+	mutex_lock(&test_fw_mutex);
+	if (test_fw_config->reqs) {
+		pr_err("Must call release_all_firmware prior to changing config\n");
+		rc = -EINVAL;
+		mutex_unlock(&test_fw_mutex);
+		goto out;
+	}
+
+	rc = __test_dev_config_update_size_t(buf, count,
+					     &test_fw_config->file_offset);
+	mutex_unlock(&test_fw_mutex);
+
+out:
+	return rc;
+}
+
+static ssize_t config_file_offset_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	return test_dev_config_show_size_t(buf, test_fw_config->file_offset);
+}
+static DEVICE_ATTR_RW(config_file_offset);
+
+static ssize_t config_partial_store(struct device *dev,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	return test_dev_config_update_bool(buf,
+					   count,
+					   &test_fw_config->partial);
+}
+
+static ssize_t config_partial_show(struct device *dev,
+				   struct device_attribute *attr,
+				   char *buf)
+{
+	return test_dev_config_show_bool(buf, test_fw_config->partial);
+}
+static DEVICE_ATTR_RW(config_partial);
+
+static ssize_t config_sync_direct_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	int rc = test_dev_config_update_bool(buf, count,
+					     &test_fw_config->sync_direct);
+
+	if (rc == count)
+		test_fw_config->req_firmware = test_fw_config->sync_direct ?
+				       request_firmware_direct :
+				       request_firmware;
+	return rc;
+}
+
+static ssize_t config_sync_direct_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	return test_dev_config_show_bool(buf, test_fw_config->sync_direct);
+}
+static DEVICE_ATTR_RW(config_sync_direct);
+
+static ssize_t config_send_uevent_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	return test_dev_config_update_bool(buf, count,
+					   &test_fw_config->send_uevent);
+}
+
+static ssize_t config_send_uevent_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	return test_dev_config_show_bool(buf, test_fw_config->send_uevent);
+}
+static DEVICE_ATTR_RW(config_send_uevent);
+
+static ssize_t config_read_fw_idx_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	return test_dev_config_update_u8(buf, count,
+					 &test_fw_config->read_fw_idx);
+}
+
+static ssize_t config_read_fw_idx_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	return test_dev_config_show_u8(buf, test_fw_config->read_fw_idx);
+}
+static DEVICE_ATTR_RW(config_read_fw_idx);
+
+
+static ssize_t trigger_request_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	int rc;
+	char *name;
+
+	name = kstrndup(buf, count, GFP_KERNEL);
+	if (!name)
+		return -ENOMEM;
+
+	pr_info("loading '%s'\n", name);
+
+	mutex_lock(&test_fw_mutex);
+	release_firmware(test_firmware);
+	if (test_fw_config->reqs)
+		__test_release_all_firmware();
+	test_firmware = NULL;
+	rc = request_firmware(&test_firmware, name, dev);
+	if (rc) {
+		pr_info("load of '%s' failed: %d\n", name, rc);
+		goto out;
+	}
+	pr_info("loaded: %zu\n", test_firmware->size);
+	rc = count;
+
+out:
+	mutex_unlock(&test_fw_mutex);
+
+	kfree(name);
+
+	return rc;
+}
+static DEVICE_ATTR_WO(trigger_request);
+
+#ifdef CONFIG_EFI_EMBEDDED_FIRMWARE
+extern struct list_head efi_embedded_fw_list;
+extern bool efi_embedded_fw_checked;
+
+static ssize_t trigger_request_platform_store(struct device *dev,
+					      struct device_attribute *attr,
+					      const char *buf, size_t count)
+{
+	static const u8 test_data[] = {
+		0x55, 0xaa, 0x55, 0xaa, 0x01, 0x02, 0x03, 0x04,
+		0x55, 0xaa, 0x55, 0xaa, 0x05, 0x06, 0x07, 0x08,
+		0x55, 0xaa, 0x55, 0xaa, 0x10, 0x20, 0x30, 0x40,
+		0x55, 0xaa, 0x55, 0xaa, 0x50, 0x60, 0x70, 0x80
+	};
+	struct efi_embedded_fw efi_embedded_fw;
+	const struct firmware *firmware = NULL;
+	bool saved_efi_embedded_fw_checked;
+	char *name;
+	int rc;
+
+	name = kstrndup(buf, count, GFP_KERNEL);
+	if (!name)
+		return -ENOMEM;
+
+	pr_info("inserting test platform fw '%s'\n", name);
+	efi_embedded_fw.name = name;
+	efi_embedded_fw.data = (void *)test_data;
+	efi_embedded_fw.length = sizeof(test_data);
+	list_add(&efi_embedded_fw.list, &efi_embedded_fw_list);
+	saved_efi_embedded_fw_checked = efi_embedded_fw_checked;
+	efi_embedded_fw_checked = true;
+
+	pr_info("loading '%s'\n", name);
+	rc = firmware_request_platform(&firmware, name, dev);
+	if (rc) {
+		pr_info("load of '%s' failed: %d\n", name, rc);
+		goto out;
+	}
+	if (firmware->size != sizeof(test_data) ||
+	    memcmp(firmware->data, test_data, sizeof(test_data)) != 0) {
+		pr_info("firmware contents mismatch for '%s'\n", name);
+		rc = -EINVAL;
+		goto out;
+	}
+	pr_info("loaded: %zu\n", firmware->size);
+	rc = count;
+
+out:
+	efi_embedded_fw_checked = saved_efi_embedded_fw_checked;
+	release_firmware(firmware);
+	list_del(&efi_embedded_fw.list);
+	kfree(name);
+
+	return rc;
+}
+static DEVICE_ATTR_WO(trigger_request_platform);
+#endif
+
+static DECLARE_COMPLETION(async_fw_done);
+
+static void trigger_async_request_cb(const struct firmware *fw, void *context)
+{
+	test_firmware = fw;
+	complete(&async_fw_done);
+}
+
+static ssize_t trigger_async_request_store(struct device *dev,
+					   struct device_attribute *attr,
+					   const char *buf, size_t count)
+{
+	int rc;
+	char *name;
+
+	name = kstrndup(buf, count, GFP_KERNEL);
+	if (!name)
+		return -ENOMEM;
+
+	pr_info("loading '%s'\n", name);
+
+	mutex_lock(&test_fw_mutex);
+	release_firmware(test_firmware);
+	test_firmware = NULL;
+	if (test_fw_config->reqs)
+		__test_release_all_firmware();
+	rc = request_firmware_nowait(THIS_MODULE, 1, name, dev, GFP_KERNEL,
+				     NULL, trigger_async_request_cb);
+	if (rc) {
+		pr_info("async load of '%s' failed: %d\n", name, rc);
+		kfree(name);
+		goto out;
+	}
+	/* Free 'name' ASAP, to test for race conditions */
+	kfree(name);
+
+	wait_for_completion(&async_fw_done);
+
+	if (test_firmware) {
+		pr_info("loaded: %zu\n", test_firmware->size);
+		rc = count;
+	} else {
+		pr_err("failed to async load firmware\n");
+		rc = -ENOMEM;
+	}
+
+out:
+	mutex_unlock(&test_fw_mutex);
+
+	return rc;
+}
+static DEVICE_ATTR_WO(trigger_async_request);
+
+static ssize_t trigger_custom_fallback_store(struct device *dev,
+					     struct device_attribute *attr,
+					     const char *buf, size_t count)
+{
+	int rc;
+	char *name;
+
+	name = kstrndup(buf, count, GFP_KERNEL);
+	if (!name)
+		return -ENOMEM;
+
+	pr_info("loading '%s' using custom fallback mechanism\n", name);
+
+	mutex_lock(&test_fw_mutex);
+	release_firmware(test_firmware);
+	if (test_fw_config->reqs)
+		__test_release_all_firmware();
+	test_firmware = NULL;
+	rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG, name,
+				     dev, GFP_KERNEL, NULL,
+				     trigger_async_request_cb);
+	if (rc) {
+		pr_info("async load of '%s' failed: %d\n", name, rc);
+		kfree(name);
+		goto out;
+	}
+	/* Free 'name' ASAP, to test for race conditions */
+	kfree(name);
+
+	wait_for_completion(&async_fw_done);
+
+	if (test_firmware) {
+		pr_info("loaded: %zu\n", test_firmware->size);
+		rc = count;
+	} else {
+		pr_err("failed to async load firmware\n");
+		rc = -ENODEV;
+	}
+
+out:
+	mutex_unlock(&test_fw_mutex);
+
+	return rc;
+}
+static DEVICE_ATTR_WO(trigger_custom_fallback);
+
+static int test_fw_run_batch_request(void *data)
+{
+	struct test_batched_req *req = data;
+
+	if (!req) {
+		test_fw_config->test_result = -EINVAL;
+		return -EINVAL;
+	}
+
+	if (test_fw_config->into_buf) {
+		void *test_buf;
+
+		test_buf = kzalloc(TEST_FIRMWARE_BUF_SIZE, GFP_KERNEL);
+		if (!test_buf)
+			return -ENOMEM;
+
+		if (test_fw_config->partial)
+			req->rc = request_partial_firmware_into_buf
+						(&req->fw,
+						 req->name,
+						 req->dev,
+						 test_buf,
+						 test_fw_config->buf_size,
+						 test_fw_config->file_offset);
+		else
+			req->rc = request_firmware_into_buf
+						(&req->fw,
+						 req->name,
+						 req->dev,
+						 test_buf,
+						 test_fw_config->buf_size);
+		if (!req->fw)
+			kfree(test_buf);
+		else
+			req->fw_buf = test_buf;
+	} else {
+		req->rc = test_fw_config->req_firmware(&req->fw,
+						       req->name,
+						       req->dev);
+	}
+
+	if (req->rc) {
+		pr_info("#%u: batched sync load failed: %d\n",
+			req->idx, req->rc);
+		if (!test_fw_config->test_result)
+			test_fw_config->test_result = req->rc;
+	} else if (req->fw) {
+		req->sent = true;
+		pr_info("#%u: batched sync loaded %zu\n",
+			req->idx, req->fw->size);
+	}
+	complete(&req->completion);
+
+	req->task = NULL;
+
+	return 0;
+}
+
+/*
+ * We use a kthread as otherwise the kernel serializes all our sync requests
+ * and we would not be able to mimic batched requests on a sync call. Batched
+ * requests on a sync call can for instance happen on a device driver when
+ * multiple cards are used and firmware loading happens outside of probe.
+ */
+static ssize_t trigger_batched_requests_store(struct device *dev,
+					      struct device_attribute *attr,
+					      const char *buf, size_t count)
+{
+	struct test_batched_req *req;
+	int rc;
+	u8 i;
+
+	mutex_lock(&test_fw_mutex);
+
+	if (test_fw_config->reqs) {
+		rc = -EBUSY;
+		goto out_bail;
+	}
+
+	test_fw_config->reqs =
+		vzalloc(array3_size(sizeof(struct test_batched_req),
+				    test_fw_config->num_requests, 2));
+	if (!test_fw_config->reqs) {
+		rc = -ENOMEM;
+		goto out_unlock;
+	}
+
+	pr_info("batched sync firmware loading '%s' %u times\n",
+		test_fw_config->name, test_fw_config->num_requests);
+
+	for (i = 0; i < test_fw_config->num_requests; i++) {
+		req = &test_fw_config->reqs[i];
+		req->fw = NULL;
+		req->idx = i;
+		req->name = test_fw_config->name;
+		req->fw_buf = NULL;
+		req->dev = dev;
+		init_completion(&req->completion);
+		req->task = kthread_run(test_fw_run_batch_request, req,
+					     "%s-%u", KBUILD_MODNAME, req->idx);
+		if (!req->task || IS_ERR(req->task)) {
+			pr_err("Setting up thread %u failed\n", req->idx);
+			req->task = NULL;
+			rc = -ENOMEM;
+			goto out_bail;
+		}
+	}
+
+	rc = count;
+
+	/*
+	 * We require an explicit release to enable more time and delay of
+	 * calling release_firmware() to improve our chances of forcing a
+	 * batched request. If we instead called release_firmware() right away
+	 * then we might miss on an opportunity of having a successful firmware
+	 * request pass on the opportunity to be come a batched request.
+	 */
+
+out_bail:
+	for (i = 0; i < test_fw_config->num_requests; i++) {
+		req = &test_fw_config->reqs[i];
+		if (req->task || req->sent)
+			wait_for_completion(&req->completion);
+	}
+
+	/* Override any worker error if we had a general setup error */
+	if (rc < 0)
+		test_fw_config->test_result = rc;
+
+out_unlock:
+	mutex_unlock(&test_fw_mutex);
+
+	return rc;
+}
+static DEVICE_ATTR_WO(trigger_batched_requests);
+
+/*
+ * We wait for each callback to return with the lock held, no need to lock here
+ */
+static void trigger_batched_cb(const struct firmware *fw, void *context)
+{
+	struct test_batched_req *req = context;
+
+	if (!req) {
+		test_fw_config->test_result = -EINVAL;
+		return;
+	}
+
+	/* forces *some* batched requests to queue up */
+	if (!req->idx)
+		ssleep(2);
+
+	req->fw = fw;
+
+	/*
+	 * Unfortunately the firmware API gives us nothing other than a null FW
+	 * if the firmware was not found on async requests.  Best we can do is
+	 * just assume -ENOENT. A better API would pass the actual return
+	 * value to the callback.
+	 */
+	if (!fw && !test_fw_config->test_result)
+		test_fw_config->test_result = -ENOENT;
+
+	complete(&req->completion);
+}
+
+static
+ssize_t trigger_batched_requests_async_store(struct device *dev,
+					     struct device_attribute *attr,
+					     const char *buf, size_t count)
+{
+	struct test_batched_req *req;
+	bool send_uevent;
+	int rc;
+	u8 i;
+
+	mutex_lock(&test_fw_mutex);
+
+	if (test_fw_config->reqs) {
+		rc = -EBUSY;
+		goto out_bail;
+	}
+
+	test_fw_config->reqs =
+		vzalloc(array3_size(sizeof(struct test_batched_req),
+				    test_fw_config->num_requests, 2));
+	if (!test_fw_config->reqs) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	pr_info("batched loading '%s' custom fallback mechanism %u times\n",
+		test_fw_config->name, test_fw_config->num_requests);
+
+	send_uevent = test_fw_config->send_uevent ? FW_ACTION_HOTPLUG :
+		FW_ACTION_NOHOTPLUG;
+
+	for (i = 0; i < test_fw_config->num_requests; i++) {
+		req = &test_fw_config->reqs[i];
+		req->name = test_fw_config->name;
+		req->fw_buf = NULL;
+		req->fw = NULL;
+		req->idx = i;
+		init_completion(&req->completion);
+		rc = request_firmware_nowait(THIS_MODULE, send_uevent,
+					     req->name,
+					     dev, GFP_KERNEL, req,
+					     trigger_batched_cb);
+		if (rc) {
+			pr_info("#%u: batched async load failed setup: %d\n",
+				i, rc);
+			req->rc = rc;
+			goto out_bail;
+		} else
+			req->sent = true;
+	}
+
+	rc = count;
+
+out_bail:
+
+	/*
+	 * We require an explicit release to enable more time and delay of
+	 * calling release_firmware() to improve our chances of forcing a
+	 * batched request. If we instead called release_firmware() right away
+	 * then we might miss on an opportunity of having a successful firmware
+	 * request pass on the opportunity to be come a batched request.
+	 */
+
+	for (i = 0; i < test_fw_config->num_requests; i++) {
+		req = &test_fw_config->reqs[i];
+		if (req->sent)
+			wait_for_completion(&req->completion);
+	}
+
+	/* Override any worker error if we had a general setup error */
+	if (rc < 0)
+		test_fw_config->test_result = rc;
+
+out:
+	mutex_unlock(&test_fw_mutex);
+
+	return rc;
+}
+static DEVICE_ATTR_WO(trigger_batched_requests_async);
+
+static ssize_t test_result_show(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	return test_dev_config_show_int(buf, test_fw_config->test_result);
+}
+static DEVICE_ATTR_RO(test_result);
+
+static ssize_t release_all_firmware_store(struct device *dev,
+					  struct device_attribute *attr,
+					  const char *buf, size_t count)
+{
+	test_release_all_firmware();
+	return count;
+}
+static DEVICE_ATTR_WO(release_all_firmware);
+
+static ssize_t read_firmware_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
+{
+	struct test_batched_req *req;
+	u8 idx;
+	ssize_t rc = 0;
+
+	mutex_lock(&test_fw_mutex);
+
+	idx = test_fw_config->read_fw_idx;
+	if (idx >= test_fw_config->num_requests) {
+		rc = -ERANGE;
+		goto out;
+	}
+
+	if (!test_fw_config->reqs) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	req = &test_fw_config->reqs[idx];
+	if (!req->fw) {
+		pr_err("#%u: failed to async load firmware\n", idx);
+		rc = -ENOENT;
+		goto out;
+	}
+
+	pr_info("#%u: loaded %zu\n", idx, req->fw->size);
+
+	if (req->fw->size > PAGE_SIZE) {
+		pr_err("Testing interface must use PAGE_SIZE firmware for now\n");
+		rc = -EINVAL;
+		goto out;
+	}
+	memcpy(buf, req->fw->data, req->fw->size);
+
+	rc = req->fw->size;
+out:
+	mutex_unlock(&test_fw_mutex);
+
+	return rc;
+}
+static DEVICE_ATTR_RO(read_firmware);
+
+#define TEST_FW_DEV_ATTR(name)          &dev_attr_##name.attr
+
+static struct attribute *test_dev_attrs[] = {
+	TEST_FW_DEV_ATTR(reset),
+
+	TEST_FW_DEV_ATTR(config),
+	TEST_FW_DEV_ATTR(config_name),
+	TEST_FW_DEV_ATTR(config_num_requests),
+	TEST_FW_DEV_ATTR(config_into_buf),
+	TEST_FW_DEV_ATTR(config_buf_size),
+	TEST_FW_DEV_ATTR(config_file_offset),
+	TEST_FW_DEV_ATTR(config_partial),
+	TEST_FW_DEV_ATTR(config_sync_direct),
+	TEST_FW_DEV_ATTR(config_send_uevent),
+	TEST_FW_DEV_ATTR(config_read_fw_idx),
+
+	/* These don't use the config at all - they could be ported! */
+	TEST_FW_DEV_ATTR(trigger_request),
+	TEST_FW_DEV_ATTR(trigger_async_request),
+	TEST_FW_DEV_ATTR(trigger_custom_fallback),
+#ifdef CONFIG_EFI_EMBEDDED_FIRMWARE
+	TEST_FW_DEV_ATTR(trigger_request_platform),
+#endif
+
+	/* These use the config and can use the test_result */
+	TEST_FW_DEV_ATTR(trigger_batched_requests),
+	TEST_FW_DEV_ATTR(trigger_batched_requests_async),
+
+	TEST_FW_DEV_ATTR(release_all_firmware),
+	TEST_FW_DEV_ATTR(test_result),
+	TEST_FW_DEV_ATTR(read_firmware),
+	NULL,
+};
+
+ATTRIBUTE_GROUPS(test_dev);
+
+static struct miscdevice test_fw_misc_device = {
+	.minor          = MISC_DYNAMIC_MINOR,
+	.name           = "test_firmware",
+	.fops           = &test_fw_fops,
+	.groups 	= test_dev_groups,
+};
+
+static int __init test_firmware_init(void)
+{
+	int rc;
+
+	test_fw_config = kzalloc(sizeof(struct test_config), GFP_KERNEL);
+	if (!test_fw_config)
+		return -ENOMEM;
+
+	rc = __test_firmware_config_init();
+	if (rc) {
+		kfree(test_fw_config);
+		pr_err("could not init firmware test config: %d\n", rc);
+		return rc;
+	}
+
+	rc = misc_register(&test_fw_misc_device);
+	if (rc) {
+		__test_firmware_config_free();
+		kfree(test_fw_config);
+		pr_err("could not register misc device: %d\n", rc);
+		return rc;
+	}
+
+	pr_warn("interface ready\n");
+
+	return 0;
+}
+
+module_init(test_firmware_init);
+
+static void __exit test_firmware_exit(void)
+{
+	mutex_lock(&test_fw_mutex);
+	release_firmware(test_firmware);
+	misc_deregister(&test_fw_misc_device);
+	__test_firmware_config_free();
+	kfree(test_fw_config);
+	mutex_unlock(&test_fw_mutex);
+
+	pr_warn("removed interface\n");
+}
+
+module_exit(test_firmware_exit);
+
+MODULE_AUTHOR("Kees Cook <keescook@chromium.org>");
+MODULE_LICENSE("GPL");