platforms/pseries/papr-vpd.c

122  * Internal VPD "blob" APIs for accumulating ibm,get-vpd results into
130 static bool vpd_blob_has_data(const struct vpd_blob *blob)
132 	return blob->data && blob->len;
135 static void vpd_blob_free(const struct vpd_blob *blob)
137 	if (blob) {
138 		kvfree(blob->data);
139 		kfree(blob);
145  * @blob: The blob to extend.
146  * @data: The new data to append to @blob.
152 static int vpd_blob_extend(struct vpd_blob *blob, const char *data, size_t len)
154 	const size_t new_len = blob->len + len;
155 	const size_t old_len = blob->len;
156 	const char *old_ptr = blob->data;
167 	blob->data = new_ptr;
168 	blob->len = new_len;
174  * @generator: Function that supplies the blob data.
188 	struct vpd_blob *blob;
193 	blob  = kzalloc(sizeof(*blob), GFP_KERNEL_ACCOUNT);
194 	if (!blob)
198 		err = vpd_blob_extend(blob, buf, len);
200 	if (err != 0 || !vpd_blob_has_data(blob))
203 	return blob;
205 	vpd_blob_free(blob);
358 	const struct vpd_blob *blob;
362 	blob = vpd_blob_generate(vpd_sequence_fill_work_area, &seq);
363 	if (!blob)
368 		vpd_blob_free(blob);
372 	return blob;
379  * Run VPD sequences against @loc_code until a blob is successfully
384  * Return: A fully populated VPD blob when successful. Encoded error
389 	const struct vpd_blob *blob;
399 		blob = papr_vpd_run_sequence(loc_code);
400 		if (!IS_ERR(blob)) /* Success. */
402 		if (PTR_ERR(blob) != -EAGAIN) /* Hard error. */
408 	return blob;
413 	const struct vpd_blob *blob = file->private_data;
416 	if (!vpd_blob_has_data(blob)) {
421 	return simple_read_from_buffer(buf, size, off, blob->data, blob->len);
426 	const struct vpd_blob *blob = file->private_data;
428 	vpd_blob_free(blob);
435 	const struct vpd_blob *blob = file->private_data;
437 	return fixed_size_llseek(file, off, whence, blob->len);
453  * @ulc and instantiates an immutable VPD "blob" for it. The blob is
455  * backing the blob is freed when the file is released.
467 	const struct vpd_blob *blob;
478 	blob = papr_vpd_retrieve(&klc);
479 	if (IS_ERR(blob))
480 		return PTR_ERR(blob);
489 				  (void *)blob, O_RDONLY);
501 	vpd_blob_free(blob);