From: Yi Li <yi1...@linux.intel.com>
Load firmware in multiple chucks(4KB) instead of the whole big firmware file
at once. The streaming support is added in the driver_data_request_sync API
based on Luis R. Rodriguez's 20170329-driver-data-v2-try3 branch.
Signed-off-by: Yi Li <yi1...@linux.intel.com>
---
drivers/base/firmware_class.c | 119 +++++++++++++++++++++++++++++++++++++++++-
include/linux/driver_data.h | 13 +++++
2 files changed, 131 insertions(+), 1 deletion(-)
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index cc3c224..beecbf5 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -569,6 +569,73 @@ fw_get_filesystem_firmware(struct device *device, struct
firmware_buf *buf)
return rc;
}
+static int
+fw_stream_filesystem_firmware(struct device *device, struct firmware_buf *buf,
+ size_t offset, size_t length, char **path)
+{
+ int i, len;
+ int rc = 0;
+ struct file *file;
+
+ buf->size = 0;
+ if (!buf->data) {
+ buf->data = vmalloc(length);
+ if (!buf->data) {
+ rc = -ENOMEM;
+ return rc;
+ }
+ }
+
+ /* skip the repeating folder searching */
+ if (*path) {
+ file = filp_open(*path, O_RDONLY, 0);
+ if (IS_ERR(file)) {
+ rc = -ENOENT;
+ return rc;
+ }
+
+ buf->size = kernel_read(file, offset, (char *)buf->data,
+ length);
+ fput(file);
+ return rc;
+ }
+
+ dev_info(device, "search %s in the folder\n", buf->fw_id);
+ *path = __getname();
+ if (!*path)
+ return -ENOMEM;
+
+ for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
+ /* skip the unset customized path */
+ if (!fw_path[i][0])
+ continue;
+
+ len = snprintf(*path, PATH_MAX, "%s/%s",
+ fw_path[i], buf->fw_id);
+ if (len >= PATH_MAX) {
+ rc = -ENAMETOOLONG;
+ break;
+ }
+
+ file = filp_open(*path, O_RDONLY, 0);
+ if (IS_ERR(file)) {
+ rc = -ENOENT;
+ continue;
+ }
+
+ buf->size = kernel_read(file, offset, (char *)buf->data,
+ length);
+ rc = 0;
+ fput(file);
+ break;
+ }
+
+ if (rc)
+ dev_err(device, "loading %s failed with error %d\n",
+ *path, rc);
+ return rc;
+}
+
/* firmware holds the ownership of pages */
static void firmware_free_data(const struct firmware *fw)
{
@@ -1310,6 +1377,46 @@ _request_firmware_prepare(struct firmware **firmware_p,
const char *name,
return 1; /* need to load */
}
+static int
+_stream_firmware(const struct firmware **firmware_p, const char *name,
+ struct driver_data_params *data_params,
+ struct device *device)
+{
+ int ret;
+ struct firmware *fw = NULL;
+ size_t offset = data_params->req_params.streaming_reqs.offset;
+ size_t buf_size = data_params->req_params.streaming_reqs.buf_size;
+
+ if ((!firmware_p) || (!name || name[0] == '\0')) {
+ dev_err(device, "invalid firmware pointer or file name\n");
+ return -EINVAL;
+ }
+
+ if (!*firmware_p) {
+ ret = _request_firmware_prepare(&fw, name, device, data_params);
+ if (ret <= 0) {
+ dev_err(device, "%s: failed %d\n",
+ __func__, ret);
+ }
+ } else {
+ fw = (struct firmware *)*firmware_p;
+ }
+
+ ret = fw_stream_filesystem_firmware(device, fw->priv, offset, buf_size,
+ data_params->req_params.streaming_reqs.path);
+ if (ret) {
+ if (!driver_data_param_optional(&data_params->req_params))
+ dev_warn(device,
+ "streaming %s failed with error %d\n",
+ name, ret);
+ } else {
+ ret = assign_firmware_buf(fw, device, data_params);
+ }
+ *firmware_p = fw;
+
+ return ret;
+}
+
/* called from request_firmware() and request_firmware_work_func() */
static int
_request_firmware(const struct firmware **firmware_p, const char *name,
@@ -1577,7 +1684,17 @@ int driver_data_request_sync(const char *name,
__module_get(sync_reqs->module);
get_device(device);
- ret = _request_firmware(&driver_data, name, ¶ms, device);
+ if (req_params->streaming_reqs.streaming) {
+ /* For streaming, driver_data is recycled and kept */
+ if (!req_params->keep)
+ return -EINVAL;
+
+ ret = _stream_firmware(req_params->streaming_reqs.driver_data,
+ name, ¶ms, device);
+ driver_data = *req_params->streaming_reqs.driver_data;
+ } else {
+ ret = _request_firmware(&driver_data, name, ¶ms, device);
+ }
if (ret && driver_data_param_optional(req_params))
ret = driver_data_sync_opt_call_cb(req_params);
else
diff --git a/include/linux/driver_data.h b/include/linux/driver_data.h
index fda1e71..ee485a5 100644
--- a/include/linux/driver_data.h
+++ b/include/linux/driver_data.h
@@ -62,6 +62,16 @@ struct driver_data_reqs {
gfp_t gfp;
};
+struct driver_data_streaming_reqs {
+ bool streaming;
+ char **path;
+ size_t offset;
+ size_t buf_size;
+ const struct firmware **driver_data;
+ void *opt_ctx1;
+ void *opt_ctx2;
+};
+
/**
* struct driver_data_req_params - driver data request parameters
* @optional: if true it is not a hard requirement by the caller that this
@@ -93,6 +103,8 @@ struct driver_data_reqs {
* digit will be placed in the middle, followed by the @api_name_postfix.
* @sync_reqs: synchronization requirements
*
+ * @streaming_reqs: streaming requirements
+ *
* This data structure is intended to carry all requirements and specifications
* required to complete the task to get the requested driver date file to the
* caller.
@@ -107,6 +119,7 @@ struct driver_data_req_params {
const char *api_name_postfix;
struct driver_data_reqs sync_reqs;
const union driver_data_cbs cbs;
+ struct driver_data_streaming_reqs streaming_reqs;
};
/*
--
2.7.4
