2 * PowerNV OPAL Firmware Update Interface
4 * Copyright 2013 IBM Corp.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
14 #include <linux/kernel.h>
15 #include <linux/reboot.h>
16 #include <linux/init.h>
17 #include <linux/kobject.h>
18 #include <linux/sysfs.h>
19 #include <linux/slab.h>
21 #include <linux/vmalloc.h>
22 #include <linux/pagemap.h>
26 /* FLASH status codes */
27 #define FLASH_NO_OP -1099 /* No operation initiated by user */
28 #define FLASH_NO_AUTH -9002 /* Not a service authority partition */
30 /* Validate image status values */
31 #define VALIDATE_IMG_READY -1001 /* Image ready for validation */
32 #define VALIDATE_IMG_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */
34 /* Manage image status values */
35 #define MANAGE_ACTIVE_ERR -9001 /* Cannot overwrite active img */
37 /* Flash image status values */
38 #define FLASH_IMG_READY 0 /* Img ready for flash on reboot */
39 #define FLASH_INVALID_IMG -1003 /* Flash image shorter than expected */
40 #define FLASH_IMG_NULL_DATA -1004 /* Bad data in sg list entry */
41 #define FLASH_IMG_BAD_LEN -1005 /* Bad length in sg list entry */
43 /* Manage operation tokens */
44 #define FLASH_REJECT_TMP_SIDE 0 /* Reject temporary fw image */
45 #define FLASH_COMMIT_TMP_SIDE 1 /* Commit temporary fw image */
48 #define FLASH_UPDATE_CANCEL 0 /* Cancel update request */
49 #define FLASH_UPDATE_INIT 1 /* Initiate update */
51 /* Validate image update result tokens */
52 #define VALIDATE_TMP_UPDATE 0 /* T side will be updated */
53 #define VALIDATE_FLASH_AUTH 1 /* Partition does not have authority */
54 #define VALIDATE_INVALID_IMG 2 /* Candidate image is not valid */
55 #define VALIDATE_CUR_UNKNOWN 3 /* Current fixpack level is unknown */
57 * Current T side will be committed to P side before being replace with new
58 * image, and the new image is downlevel from current image
60 #define VALIDATE_TMP_COMMIT_DL 4
62 * Current T side will be committed to P side before being replaced with new
65 #define VALIDATE_TMP_COMMIT 5
67 * T side will be updated with a downlevel image
69 #define VALIDATE_TMP_UPDATE_DL 6
71 * The candidate image's release date is later than the system's firmware
72 * service entitlement date - service warranty period has expired
74 #define VALIDATE_OUT_OF_WRNTY 7
76 /* Validate buffer size */
77 #define VALIDATE_BUF_SIZE 4096
79 /* XXX: Assume candidate image size is <= 1GB */
80 #define MAX_IMAGE_SIZE 0x40000000
82 /* Flash sg list version */
83 #define SG_LIST_VERSION (1UL)
92 /* Candidate image data */
99 /* Candidate image header */
100 struct image_header_t {
106 struct validate_flash_t {
107 int status; /* Return status */
108 void *buf; /* Candidate image buffer */
109 uint32_t buf_size; /* Image size */
110 uint32_t result; /* Update results token */
113 struct manage_flash_t {
114 int status; /* Return status */
117 struct update_flash_t {
118 int status; /* Return status */
121 static struct image_header_t image_header;
122 static struct image_data_t image_data;
123 static struct validate_flash_t validate_flash_data;
124 static struct manage_flash_t manage_flash_data;
125 static struct update_flash_t update_flash_data;
127 static DEFINE_MUTEX(image_data_mutex);
130 * Validate candidate image
132 static inline void opal_flash_validate(void)
135 void *buf = validate_flash_data.buf;
138 ret = opal_validate_flash(__pa(buf), &size, &result);
140 validate_flash_data.status = ret;
141 validate_flash_data.buf_size = be32_to_cpu(size);
142 validate_flash_data.result = be32_to_cpu(result);
146 * Validate output format:
147 * validate result token
148 * current image version details
149 * new image version details
151 static ssize_t validate_show(struct kobject *kobj,
152 struct kobj_attribute *attr, char *buf)
154 struct validate_flash_t *args_buf = &validate_flash_data;
157 /* Candidate image is not validated */
158 if (args_buf->status < VALIDATE_TMP_UPDATE) {
159 len = sprintf(buf, "%d\n", args_buf->status);
164 len = sprintf(buf, "%d\n", args_buf->result);
166 /* Current and candidate image version details */
167 if ((args_buf->result != VALIDATE_TMP_UPDATE) &&
168 (args_buf->result < VALIDATE_CUR_UNKNOWN))
171 if (args_buf->buf_size > (VALIDATE_BUF_SIZE - len)) {
172 memcpy(buf + len, args_buf->buf, VALIDATE_BUF_SIZE - len);
173 len = VALIDATE_BUF_SIZE;
175 memcpy(buf + len, args_buf->buf, args_buf->buf_size);
176 len += args_buf->buf_size;
179 /* Set status to default */
180 args_buf->status = FLASH_NO_OP;
185 * Validate candidate firmware image
188 * We are only interested in first 4K bytes of the
191 static ssize_t validate_store(struct kobject *kobj,
192 struct kobj_attribute *attr,
193 const char *buf, size_t count)
195 struct validate_flash_t *args_buf = &validate_flash_data;
200 mutex_lock(&image_data_mutex);
202 if (image_data.status != IMAGE_READY ||
203 image_data.size < VALIDATE_BUF_SIZE) {
204 args_buf->result = VALIDATE_INVALID_IMG;
205 args_buf->status = VALIDATE_IMG_INCOMPLETE;
209 /* Copy first 4k bytes of candidate image */
210 memcpy(args_buf->buf, image_data.data, VALIDATE_BUF_SIZE);
212 args_buf->status = VALIDATE_IMG_READY;
213 args_buf->buf_size = VALIDATE_BUF_SIZE;
215 /* Validate candidate image */
216 opal_flash_validate();
219 mutex_unlock(&image_data_mutex);
224 * Manage flash routine
226 static inline void opal_flash_manage(uint8_t op)
228 struct manage_flash_t *const args_buf = &manage_flash_data;
230 args_buf->status = opal_manage_flash(op);
234 * Show manage flash status
236 static ssize_t manage_show(struct kobject *kobj,
237 struct kobj_attribute *attr, char *buf)
239 struct manage_flash_t *const args_buf = &manage_flash_data;
242 rc = sprintf(buf, "%d\n", args_buf->status);
243 /* Set status to default*/
244 args_buf->status = FLASH_NO_OP;
253 static ssize_t manage_store(struct kobject *kobj,
254 struct kobj_attribute *attr,
255 const char *buf, size_t count)
260 op = FLASH_REJECT_TMP_SIDE;
263 op = FLASH_COMMIT_TMP_SIDE;
269 /* commit/reject temporary image */
270 opal_flash_manage(op);
277 static void free_sg_list(struct opal_sg_list *list)
279 struct opal_sg_list *sg1;
289 * Build candidate image scatter gather list
292 * -----------------------------------
293 * | VER (8) | Entry length in bytes |
294 * -----------------------------------
295 * | Pointer to next entry |
296 * -----------------------------------
297 * | Address of memory area 1 |
298 * -----------------------------------
299 * | Length of memory area 1 |
300 * -----------------------------------
302 * -----------------------------------
304 * -----------------------------------
305 * | Address of memory area N |
306 * -----------------------------------
307 * | Length of memory area N |
308 * -----------------------------------
310 static struct opal_sg_list *image_data_to_sglist(void)
312 struct opal_sg_list *sg1, *list = NULL;
316 addr = image_data.data;
317 size = image_data.size;
319 sg1 = kzalloc(PAGE_SIZE, GFP_KERNEL);
324 sg1->num_entries = 0;
326 /* Translate virtual address to physical address */
327 sg1->entry[sg1->num_entries].data =
328 (void *)(vmalloc_to_pfn(addr) << PAGE_SHIFT);
330 if (size > PAGE_SIZE)
331 sg1->entry[sg1->num_entries].length = PAGE_SIZE;
333 sg1->entry[sg1->num_entries].length = size;
336 if (sg1->num_entries >= SG_ENTRIES_PER_NODE) {
337 sg1->next = kzalloc(PAGE_SIZE, GFP_KERNEL);
339 pr_err("%s : Failed to allocate memory\n",
345 sg1->num_entries = 0;
359 static int opal_flash_update(int op)
361 struct opal_sg_list *sg, *list, *next;
363 int64_t rc = OPAL_PARAMETER;
365 if (op == FLASH_UPDATE_CANCEL) {
366 pr_alert("FLASH: Image update cancelled\n");
371 list = image_data_to_sglist();
375 /* First entry address */
378 /* Translate sg list address to absolute */
379 for (sg = list; sg; sg = next) {
381 /* Don't translate NULL pointer for last entry */
383 sg->next = (struct opal_sg_list *)__pa(sg->next);
388 * Convert num_entries to version/length format
391 sg->num_entries = (SG_LIST_VERSION << 56) |
392 (sg->num_entries * sizeof(struct opal_sg_entry) + 16);
395 pr_alert("FLASH: Image is %u bytes\n", image_data.size);
396 pr_alert("FLASH: Image update requested\n");
397 pr_alert("FLASH: Image will be updated during system reboot\n");
398 pr_alert("FLASH: This will take several minutes. Do not power off!\n");
401 rc = opal_update_flash(addr);
408 * Show candidate image status
410 static ssize_t update_show(struct kobject *kobj,
411 struct kobj_attribute *attr, char *buf)
413 struct update_flash_t *const args_buf = &update_flash_data;
414 return sprintf(buf, "%d\n", args_buf->status);
418 * Set update image flag
419 * 1 - Flash new image
420 * 0 - Cancel flash request
422 static ssize_t update_store(struct kobject *kobj,
423 struct kobj_attribute *attr,
424 const char *buf, size_t count)
426 struct update_flash_t *const args_buf = &update_flash_data;
429 mutex_lock(&image_data_mutex);
433 if (args_buf->status == FLASH_IMG_READY)
434 opal_flash_update(FLASH_UPDATE_CANCEL);
435 args_buf->status = FLASH_NO_OP;
438 /* Image is loaded? */
439 if (image_data.status == IMAGE_READY)
441 opal_flash_update(FLASH_UPDATE_INIT);
443 args_buf->status = FLASH_INVALID_IMG;
449 mutex_unlock(&image_data_mutex);
456 static void free_image_buf(void)
461 addr = image_data.data;
462 size = PAGE_ALIGN(image_data.size);
464 ClearPageReserved(vmalloc_to_page(addr));
468 vfree(image_data.data);
469 image_data.data = NULL;
470 image_data.status = IMAGE_INVALID;
474 * Allocate image buffer.
476 static int alloc_image_buf(char *buffer, size_t count)
481 if (count < sizeof(struct image_header_t)) {
482 pr_warn("FLASH: Invalid candidate image\n");
486 memcpy(&image_header, (void *)buffer, sizeof(struct image_header_t));
487 image_data.size = be32_to_cpu(image_header.size);
488 pr_debug("FLASH: Candidate image size = %u\n", image_data.size);
490 if (image_data.size > MAX_IMAGE_SIZE) {
491 pr_warn("FLASH: Too large image\n");
494 if (image_data.size < VALIDATE_BUF_SIZE) {
495 pr_warn("FLASH: Image is shorter than expected\n");
499 image_data.data = vzalloc(PAGE_ALIGN(image_data.size));
500 if (!image_data.data) {
501 pr_err("%s : Failed to allocate memory\n", __func__);
506 addr = image_data.data;
507 size = PAGE_ALIGN(image_data.size);
509 SetPageReserved(vmalloc_to_page(addr));
514 image_data.status = IMAGE_LOADING;
519 * Copy candidate image
521 * Parse candidate image header to get total image size
522 * and pre-allocate required memory.
524 static ssize_t image_data_write(struct file *filp, struct kobject *kobj,
525 struct bin_attribute *bin_attr,
526 char *buffer, loff_t pos, size_t count)
530 mutex_lock(&image_data_mutex);
534 /* Free memory, if already allocated */
538 /* Cancel outstanding image update request */
539 if (update_flash_data.status == FLASH_IMG_READY)
540 opal_flash_update(FLASH_UPDATE_CANCEL);
542 /* Allocate memory */
543 rc = alloc_image_buf(buffer, count);
548 if (image_data.status != IMAGE_LOADING) {
553 if ((pos + count) > image_data.size) {
558 memcpy(image_data.data + pos, (void *)buffer, count);
561 /* Set image status */
562 if ((pos + count) == image_data.size) {
563 pr_debug("FLASH: Candidate image loaded....\n");
564 image_data.status = IMAGE_READY;
568 mutex_unlock(&image_data_mutex);
574 * OPAL uses below sysfs files for code update.
575 * We create these files under /sys/firmware/opal.
577 * image : Interface to load candidate firmware image
578 * validate_flash : Validate firmware image
579 * manage_flash : Commit/Reject firmware image
580 * update_flash : Flash new firmware image
583 static struct bin_attribute image_data_attr = {
584 .attr = {.name = "image", .mode = 0200},
585 .size = MAX_IMAGE_SIZE, /* Limit image size */
586 .write = image_data_write,
589 static struct kobj_attribute validate_attribute =
590 __ATTR(validate_flash, 0600, validate_show, validate_store);
592 static struct kobj_attribute manage_attribute =
593 __ATTR(manage_flash, 0600, manage_show, manage_store);
595 static struct kobj_attribute update_attribute =
596 __ATTR(update_flash, 0600, update_show, update_store);
598 static struct attribute *image_op_attrs[] = {
599 &validate_attribute.attr,
600 &manage_attribute.attr,
601 &update_attribute.attr,
602 NULL /* need to NULL terminate the list of attributes */
605 static struct attribute_group image_op_attr_group = {
606 .attrs = image_op_attrs,
609 void __init opal_flash_init(void)
613 /* Allocate validate image buffer */
614 validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL);
615 if (!validate_flash_data.buf) {
616 pr_err("%s : Failed to allocate memory\n", __func__);
620 /* Make sure /sys/firmware/opal directory is created */
622 pr_warn("FLASH: opal kobject is not available\n");
626 /* Create the sysfs files */
627 ret = sysfs_create_group(opal_kobj, &image_op_attr_group);
629 pr_warn("FLASH: Failed to create sysfs files\n");
633 ret = sysfs_create_bin_file(opal_kobj, &image_data_attr);
635 pr_warn("FLASH: Failed to create sysfs files\n");
639 /* Set default status */
640 validate_flash_data.status = FLASH_NO_OP;
641 manage_flash_data.status = FLASH_NO_OP;
642 update_flash_data.status = FLASH_NO_OP;
643 image_data.status = IMAGE_INVALID;
647 sysfs_remove_group(opal_kobj, &image_op_attr_group);
650 kfree(validate_flash_data.buf);