[PATCH v6 3/8] test_firmware: add partial read support for request_firmware_into_buf

Scott Branden
2020-06-05T23:01:14Z

Add additional hooks to test_firmware to pass in support
for partial file read using request_firmware_into_buf.
buf_size: size of buffer to request firmware into
partial: indicates that a partial file request is being made
file_offset: to indicate offset into file to request

Signed-off-by: Scott Branden <scott.branden@broadcom.com>
---
lib/test_firmware.c | 146 +++++++++++++++++++++++++++++++++++++++++---
1 file changed, 136 insertions(+), 10 deletions(-)

diff --git a/lib/test_firmware.c b/lib/test_firmware.c
index af747660fe29..1a79611cae78 100644
--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -50,6 +50,9 @@ struct test_batched_req {
* @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
@@ -89,6 +92,9 @@ struct test_batched_req {
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;
@@ -183,6 +189,9 @@ static int __test_firmware_config_init(void)
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;
@@ -236,28 +245,35 @@ static ssize_t config_show(struct device *dev,
dev_name(dev));

if (test_fw_config->name)
- len += scnprintf(buf+len, PAGE_SIZE - len,
+ len += scnprintf(buf + len, PAGE_SIZE - len,
"name:\t%s\n",
test_fw_config->name);
else
- len += scnprintf(buf+len, PAGE_SIZE - len,
+ len += scnprintf(buf + len, PAGE_SIZE - len,
"name:\tEMTPY\n");

- len += scnprintf(buf+len, PAGE_SIZE - len,
+ len += scnprintf(buf + len, PAGE_SIZE - len,
"num_requests:\t%u\n", test_fw_config->num_requests);

- len += scnprintf(buf+len, PAGE_SIZE - len,
+ 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,
+ 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,
+ 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,
+ len += scnprintf(buf + len, PAGE_SIZE - len,
"read_fw_idx:\t%u\n", test_fw_config->read_fw_idx);

mutex_unlock(&test_fw_mutex);
@@ -315,6 +331,30 @@ 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;
+
+ mutex_lock(&test_fw_mutex);
+ *(size_t *)cfg = new;
+ mutex_unlock(&test_fw_mutex);
+
+ /* 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);
@@ -400,6 +440,83 @@ static ssize_t config_into_buf_show(struct device *dev,
}
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;
+ }
+ mutex_unlock(&test_fw_mutex);
+
+ rc = test_dev_config_update_size_t(buf, count,
+ &test_fw_config->buf_size);
+
+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;
+ }
+ mutex_unlock(&test_fw_mutex);
+
+ rc = test_dev_config_update_size_t(buf, count,
+ &test_fw_config->file_offset);
+
+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)
@@ -645,18 +762,24 @@ static int test_fw_run_batch_request(void *data)

if (test_fw_config->into_buf) {
void *test_buf;
+ enum kernel_pread_opt pread_opt;

test_buf = kzalloc(TEST_FIRMWARE_BUF_SIZE, GFP_KERNEL);
if (!test_buf)
return -ENOSPC;

+ if (test_fw_config->partial)
+ pread_opt = KERNEL_PREAD_PART;
+ else
+ pread_opt = KERNEL_PREAD_WHOLE;
+
req->rc = request_firmware_into_buf(&req->fw,
req->name,
req->dev,
test_buf,
- TEST_FIRMWARE_BUF_SIZE,
- 0,
- KERNEL_PREAD_WHOLE);
+ test_fw_config->buf_size,
+ test_fw_config->file_offset,
+ pread_opt);
if (!req->fw)
kfree(test_buf);
} else {
@@ -929,6 +1052,9 @@ static struct attribute *test_dev_attrs[] = {
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),
--
2.17.1