diff options
Diffstat (limited to 'lib/test_firmware.c')
| -rw-r--r-- | lib/test_firmware.c | 1188 |
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"); |