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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/module.h>#include <linux/init.h>#include <linux/slab.h>#include <linux/proc_fs.h>#include <linux/reboot.h>#include <asm/delay.h>#include <linux/uaccess.h>#include <asm/rtas.h>
#define MODULE_VERS "1.0"#define MODULE_NAME "rtas_flash"
#define FIRMWARE_FLASH_NAME "firmware_flash" #define FIRMWARE_UPDATE_NAME "firmware_update"#define MANAGE_FLASH_NAME "manage_flash"#define VALIDATE_FLASH_NAME "validate_flash"
/* General RTAS Status Codes */#define RTAS_RC_SUCCESS 0#define RTAS_RC_HW_ERR -1#define RTAS_RC_BUSY -2
/* Flash image status values */#define FLASH_AUTH -9002 /* RTAS Not Service Authority Partition */#define FLASH_NO_OP -1099 /* No operation initiated by user */ #define FLASH_IMG_SHORT -1005 /* Flash image shorter than expected */#define FLASH_IMG_BAD_LEN -1004 /* Bad length value in flash list block */#define FLASH_IMG_NULL_DATA -1003 /* Bad data value in flash list block */#define FLASH_IMG_READY 0 /* Firmware img ready for flash on reboot */
/* Manage image status values */#define MANAGE_AUTH -9002 /* RTAS Not Service Authority Partition */#define MANAGE_ACTIVE_ERR -9001 /* RTAS Cannot Overwrite Active Img */#define MANAGE_NO_OP -1099 /* No operation initiated by user */#define MANAGE_PARAM_ERR -3 /* RTAS Parameter Error */#define MANAGE_HW_ERR -1 /* RTAS Hardware Error */
/* Validate image status values */#define VALIDATE_AUTH -9002 /* RTAS Not Service Authority Partition */#define VALIDATE_NO_OP -1099 /* No operation initiated by the user */#define VALIDATE_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */#define VALIDATE_READY -1001 /* Firmware image ready for validation */#define VALIDATE_PARAM_ERR -3 /* RTAS Parameter Error */#define VALIDATE_HW_ERR -1 /* RTAS Hardware Error */
/* ibm,validate-flash-image update result tokens */#define VALIDATE_TMP_UPDATE 0 /* T side will be updated */#define VALIDATE_FLASH_AUTH 1 /* Partition does not have authority */#define VALIDATE_INVALID_IMG 2 /* Candidate image is not valid */#define VALIDATE_CUR_UNKNOWN 3 /* Current fixpack level is unknown *//* * Current T side will be committed to P side before being replace with new * image, and the new image is downlevel from current image */#define VALIDATE_TMP_COMMIT_DL 4/* * Current T side will be committed to P side before being replaced with new * image */#define VALIDATE_TMP_COMMIT 5/* * T side will be updated with a downlevel image */#define VALIDATE_TMP_UPDATE_DL 6/* * The candidate image's release date is later than the system's firmware * service entitlement date - service warranty period has expired */#define VALIDATE_OUT_OF_WRNTY 7
/* ibm,manage-flash-image operation tokens */#define RTAS_REJECT_TMP_IMG 0#define RTAS_COMMIT_TMP_IMG 1
/* Array sizes */#define VALIDATE_BUF_SIZE 4096 #define VALIDATE_MSG_LEN 256#define RTAS_MSG_MAXLEN 64
/* Quirk - RTAS requires 4k list length and block size */#define RTAS_BLKLIST_LENGTH 4096#define RTAS_BLK_SIZE 4096
struct flash_block { char *data; unsigned long length;};
/* This struct is very similar but not identical to * that needed by the rtas flash update. * All we need to do for rtas is rewrite num_blocks * into a version/length and translate the pointers * to absolute. */#define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block))struct flash_block_list { unsigned long num_blocks; struct flash_block_list *next; struct flash_block blocks[FLASH_BLOCKS_PER_NODE];};
static struct flash_block_list *rtas_firmware_flash_list;
/* Use slab cache to guarantee 4k alignment */static struct kmem_cache *flash_block_cache = NULL;
#define FLASH_BLOCK_LIST_VERSION (1UL)
/* * Local copy of the flash block list. * * The rtas_firmware_flash_list variable will be * set once the data is fully read. * * For convenience as we build the list we use virtual addrs, * we do not fill in the version number, and the length field * is treated as the number of entries currently in the block * (i.e. not a byte count). This is all fixed when calling * the flash routine. */
/* Status int must be first member of struct */struct rtas_update_flash_t{ int status; /* Flash update status */ struct flash_block_list *flist; /* Local copy of flash block list */};
/* Status int must be first member of struct */struct rtas_manage_flash_t{ int status; /* Returned status */};
/* Status int must be first member of struct */struct rtas_validate_flash_t{ int status; /* Returned status */ char *buf; /* Candidate image buffer */ unsigned int buf_size; /* Size of image buf */ unsigned int update_results; /* Update results token */};
static struct rtas_update_flash_t rtas_update_flash_data;static struct rtas_manage_flash_t rtas_manage_flash_data;static struct rtas_validate_flash_t rtas_validate_flash_data;static DEFINE_MUTEX(rtas_update_flash_mutex);static DEFINE_MUTEX(rtas_manage_flash_mutex);static DEFINE_MUTEX(rtas_validate_flash_mutex);
/* Do simple sanity checks on the flash image. */static int flash_list_valid(struct flash_block_list *flist){ struct flash_block_list *f; int i; unsigned long block_size, image_size;
/* Paranoid self test here. We also collect the image size. */ image_size = 0; for (f = flist; f; f = f->next) { for (i = 0; i < f->num_blocks; i++) { if (f->blocks[i].data == NULL) { return FLASH_IMG_NULL_DATA; } block_size = f->blocks[i].length; if (block_size <= 0 || block_size > RTAS_BLK_SIZE) { return FLASH_IMG_BAD_LEN; } image_size += block_size; } }
if (image_size < (256 << 10)) { if (image_size < 2) return FLASH_NO_OP; }
printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size);
return FLASH_IMG_READY;}
static void free_flash_list(struct flash_block_list *f){ struct flash_block_list *next; int i;
while (f) { for (i = 0; i < f->num_blocks; i++) kmem_cache_free(flash_block_cache, f->blocks[i].data); next = f->next; kmem_cache_free(flash_block_cache, f); f = next; }}
static int rtas_flash_release(struct inode *inode, struct file *file){ struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
mutex_lock(&rtas_update_flash_mutex);
if (uf->flist) { /* File was opened in write mode for a new flash attempt */ /* Clear saved list */ if (rtas_firmware_flash_list) { free_flash_list(rtas_firmware_flash_list); rtas_firmware_flash_list = NULL; }
if (uf->status != FLASH_AUTH) uf->status = flash_list_valid(uf->flist);
if (uf->status == FLASH_IMG_READY) rtas_firmware_flash_list = uf->flist; else free_flash_list(uf->flist);
uf->flist = NULL; }
mutex_unlock(&rtas_update_flash_mutex); return 0;}
static size_t get_flash_status_msg(int status, char *buf){ const char *msg; size_t len;
switch (status) { case FLASH_AUTH: msg = "error: this partition does not have service authority\n"; break; case FLASH_NO_OP: msg = "info: no firmware image for flash\n"; break; case FLASH_IMG_SHORT: msg = "error: flash image short\n"; break; case FLASH_IMG_BAD_LEN: msg = "error: internal error bad length\n"; break; case FLASH_IMG_NULL_DATA: msg = "error: internal error null data\n"; break; case FLASH_IMG_READY: msg = "ready: firmware image ready for flash on reboot\n"; break; default: return sprintf(buf, "error: unexpected status value %d\n", status); }
len = strlen(msg); memcpy(buf, msg, len + 1); return len;}
/* Reading the proc file will show status (not the firmware contents) */static ssize_t rtas_flash_read_msg(struct file *file, char __user *buf, size_t count, loff_t *ppos){ struct rtas_update_flash_t *const uf = &rtas_update_flash_data; char msg[RTAS_MSG_MAXLEN]; size_t len; int status;
mutex_lock(&rtas_update_flash_mutex); status = uf->status; mutex_unlock(&rtas_update_flash_mutex);
/* Read as text message */ len = get_flash_status_msg(status, msg); return simple_read_from_buffer(buf, count, ppos, msg, len);}
static ssize_t rtas_flash_read_num(struct file *file, char __user *buf, size_t count, loff_t *ppos){ struct rtas_update_flash_t *const uf = &rtas_update_flash_data; char msg[RTAS_MSG_MAXLEN]; int status;
mutex_lock(&rtas_update_flash_mutex); status = uf->status; mutex_unlock(&rtas_update_flash_mutex);
/* Read as number */ sprintf(msg, "%d\n", status); return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg));}
/* We could be much more efficient here. But to keep this function * simple we allocate a page to the block list no matter how small the * count is. If the system is low on memory it will be just as well * that we fail.... */static ssize_t rtas_flash_write(struct file *file, const char __user *buffer, size_t count, loff_t *off){ struct rtas_update_flash_t *const uf = &rtas_update_flash_data; char *p; int next_free; struct flash_block_list *fl;
guard(mutex)(&rtas_update_flash_mutex);
if (uf->status == FLASH_AUTH || count == 0) return count; /* discard data */
/* In the case that the image is not ready for flashing, the memory * allocated for the block list will be freed upon the release of the * proc file */ if (uf->flist == NULL) { uf->flist = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); if (!uf->flist) return -ENOMEM; }
fl = uf->flist; while (fl->next) fl = fl->next; /* seek to last block_list for append */ next_free = fl->num_blocks; if (next_free == FLASH_BLOCKS_PER_NODE) { /* Need to allocate another block_list */ fl->next = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); if (!fl->next) return -ENOMEM; fl = fl->next; next_free = 0; }
if (count > RTAS_BLK_SIZE) count = RTAS_BLK_SIZE; p = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); if (!p) return -ENOMEM; if(copy_from_user(p, buffer, count)) { kmem_cache_free(flash_block_cache, p); return -EFAULT; } fl->blocks[next_free].data = p; fl->blocks[next_free].length = count; fl->num_blocks++;
return count;}
/* * Flash management routines. */static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op){ s32 rc;
do { rc = rtas_call(rtas_function_token(RTAS_FN_IBM_MANAGE_FLASH_IMAGE), 1, 1, NULL, op); } while (rtas_busy_delay(rc));
args_buf->status = rc;}
static ssize_t manage_flash_read(struct file *file, char __user *buf, size_t count, loff_t *ppos){ struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data; char msg[RTAS_MSG_MAXLEN]; int msglen, status;
mutex_lock(&rtas_manage_flash_mutex); status = args_buf->status; mutex_unlock(&rtas_manage_flash_mutex);
msglen = sprintf(msg, "%d\n", status); return simple_read_from_buffer(buf, count, ppos, msg, msglen);}
static ssize_t manage_flash_write(struct file *file, const char __user *buf, size_t count, loff_t *off){ struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data; static const char reject_str[] = "0"; static const char commit_str[] = "1"; char stkbuf[10]; int op;
guard(mutex)(&rtas_manage_flash_mutex);
if ((args_buf->status == MANAGE_AUTH) || (count == 0)) return count; op = -1; if (buf) { if (count > 9) count = 9; if (copy_from_user (stkbuf, buf, count)) return -EFAULT; if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) op = RTAS_REJECT_TMP_IMG; else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) op = RTAS_COMMIT_TMP_IMG; } if (op == -1) { /* buf is empty, or contains invalid string */ return -EINVAL; }
manage_flash(args_buf, op); return count;}
/* * Validation routines. */static void validate_flash(struct rtas_validate_flash_t *args_buf){ int token = rtas_function_token(RTAS_FN_IBM_VALIDATE_FLASH_IMAGE); int update_results; s32 rc;
rc = 0; do { spin_lock(&rtas_data_buf_lock); memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE); rc = rtas_call(token, 2, 2, &update_results, (u32) __pa(rtas_data_buf), args_buf->buf_size); memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE); spin_unlock(&rtas_data_buf_lock); } while (rtas_busy_delay(rc));
args_buf->status = rc; args_buf->update_results = update_results;}
static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, char *msg, int msglen){ int n;
if (args_buf->status >= VALIDATE_TMP_UPDATE) { n = sprintf(msg, "%d\n", args_buf->update_results); if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) || (args_buf->update_results == VALIDATE_TMP_UPDATE)) n += snprintf(msg + n, msglen - n, "%s\n", args_buf->buf); } else { n = sprintf(msg, "%d\n", args_buf->status); } return n;}
static ssize_t validate_flash_read(struct file *file, char __user *buf, size_t count, loff_t *ppos){ struct rtas_validate_flash_t *const args_buf = &rtas_validate_flash_data; char msg[VALIDATE_MSG_LEN]; int msglen;
mutex_lock(&rtas_validate_flash_mutex); msglen = get_validate_flash_msg(args_buf, msg, VALIDATE_MSG_LEN); mutex_unlock(&rtas_validate_flash_mutex);
return simple_read_from_buffer(buf, count, ppos, msg, msglen);}
static ssize_t validate_flash_write(struct file *file, const char __user *buf, size_t count, loff_t *off){ struct rtas_validate_flash_t *const args_buf = &rtas_validate_flash_data;
guard(mutex)(&rtas_validate_flash_mutex);
/* We are only interested in the first 4K of the * candidate image */ if ((*off >= VALIDATE_BUF_SIZE) || (args_buf->status == VALIDATE_AUTH)) { *off += count; return count; }
if (*off + count >= VALIDATE_BUF_SIZE) { count = VALIDATE_BUF_SIZE - *off; args_buf->status = VALIDATE_READY; } else { args_buf->status = VALIDATE_INCOMPLETE; }
if (!access_ok(buf, count)) return -EFAULT;
if (copy_from_user(args_buf->buf + *off, buf, count)) return -EFAULT;
*off += count; return count;}
static int validate_flash_release(struct inode *inode, struct file *file){ struct rtas_validate_flash_t *const args_buf = &rtas_validate_flash_data;
mutex_lock(&rtas_validate_flash_mutex);
if (args_buf->status == VALIDATE_READY) { args_buf->buf_size = VALIDATE_BUF_SIZE; validate_flash(args_buf); }
mutex_unlock(&rtas_validate_flash_mutex); return 0;}
/* * On-reboot flash update applicator. */static void rtas_flash_firmware(int reboot_type){ unsigned long image_size; struct flash_block_list *f, *next, *flist; unsigned long rtas_block_list; int i, status, update_token;
if (rtas_firmware_flash_list == NULL) return; /* nothing to do */
if (reboot_type != SYS_RESTART) { printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n"); printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n"); return; }
update_token = rtas_function_token(RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT); if (update_token == RTAS_UNKNOWN_SERVICE) { printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot " "is not available -- not a service partition?\n"); printk(KERN_ALERT "FLASH: firmware will not be flashed\n"); return; }
/* * Just before starting the firmware flash, cancel the event scan work * to avoid any soft lockup issues. */ rtas_cancel_event_scan();
/* * NOTE: the "first" block must be under 4GB, so we create * an entry with no data blocks in the reserved buffer in * the kernel data segment. */ spin_lock(&rtas_data_buf_lock); flist = (struct flash_block_list *)&rtas_data_buf[0]; flist->num_blocks = 0; flist->next = rtas_firmware_flash_list; rtas_block_list = __pa(flist); if (rtas_block_list >= 4UL*1024*1024*1024) { printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n"); spin_unlock(&rtas_data_buf_lock); return; }
printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n"); /* Update the block_list in place. */ rtas_firmware_flash_list = NULL; /* too hard to backout on error */ image_size = 0; for (f = flist; f; f = next) { /* Translate data addrs to absolute */ for (i = 0; i < f->num_blocks; i++) { f->blocks[i].data = (char *)cpu_to_be64(__pa(f->blocks[i].data)); image_size += f->blocks[i].length; f->blocks[i].length = cpu_to_be64(f->blocks[i].length); } next = f->next; /* Don't translate NULL pointer for last entry */ if (f->next) f->next = (struct flash_block_list *)cpu_to_be64(__pa(f->next)); else f->next = NULL; /* make num_blocks into the version/length field */ f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16); f->num_blocks = cpu_to_be64(f->num_blocks); }
printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size); printk(KERN_ALERT "FLASH: performing flash and reboot\n"); rtas_progress("Flashing \n", 0x0); rtas_progress("Please Wait... ", 0x0); printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n"); status = rtas_call(update_token, 1, 1, NULL, rtas_block_list); switch (status) { /* should only get "bad" status */ case 0: printk(KERN_ALERT "FLASH: success\n"); break; case -1: printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n"); break; case -3: printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n"); break; case -4: printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n"); break; default: printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status); break; } spin_unlock(&rtas_data_buf_lock);}
/* * Manifest of proc files to create */struct rtas_flash_file { const char *filename; const rtas_fn_handle_t handle; int *status; const struct proc_ops ops;};
static const struct rtas_flash_file rtas_flash_files[] = { { .filename = "powerpc/rtas/" FIRMWARE_FLASH_NAME, .handle = RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT, .status = &rtas_update_flash_data.status, .ops.proc_read = rtas_flash_read_msg, .ops.proc_write = rtas_flash_write, .ops.proc_release = rtas_flash_release, .ops.proc_lseek = default_llseek, }, { .filename = "powerpc/rtas/" FIRMWARE_UPDATE_NAME, .handle = RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT, .status = &rtas_update_flash_data.status, .ops.proc_read = rtas_flash_read_num, .ops.proc_write = rtas_flash_write, .ops.proc_release = rtas_flash_release, .ops.proc_lseek = default_llseek, }, { .filename = "powerpc/rtas/" VALIDATE_FLASH_NAME, .handle = RTAS_FN_IBM_VALIDATE_FLASH_IMAGE, .status = &rtas_validate_flash_data.status, .ops.proc_read = validate_flash_read, .ops.proc_write = validate_flash_write, .ops.proc_release = validate_flash_release, .ops.proc_lseek = default_llseek, }, { .filename = "powerpc/rtas/" MANAGE_FLASH_NAME, .handle = RTAS_FN_IBM_MANAGE_FLASH_IMAGE, .status = &rtas_manage_flash_data.status, .ops.proc_read = manage_flash_read, .ops.proc_write = manage_flash_write, .ops.proc_lseek = default_llseek, }};
static int __init rtas_flash_init(void){ int i;
if (rtas_function_token(RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT) == RTAS_UNKNOWN_SERVICE) { pr_info("rtas_flash: no firmware flash support\n"); return -EINVAL; }
rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL); if (!rtas_validate_flash_data.buf) return -ENOMEM;
flash_block_cache = kmem_cache_create_usercopy("rtas_flash_cache", RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0, 0, RTAS_BLK_SIZE, NULL); if (!flash_block_cache) { printk(KERN_ERR "%s: failed to create block cache\n", __func__); goto enomem_buf; }
for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) { const struct rtas_flash_file *f = &rtas_flash_files[i]; int token;
if (!proc_create(f->filename, 0600, NULL, &f->ops)) goto enomem;
/* * This code assumes that the status int is the first member of the * struct */ token = rtas_function_token(f->handle); if (token == RTAS_UNKNOWN_SERVICE) *f->status = FLASH_AUTH; else *f->status = FLASH_NO_OP; }
rtas_flash_term_hook = rtas_flash_firmware; return 0;
enomem: while (--i >= 0) { const struct rtas_flash_file *f = &rtas_flash_files[i]; remove_proc_entry(f->filename, NULL); }
kmem_cache_destroy(flash_block_cache);enomem_buf: kfree(rtas_validate_flash_data.buf); return -ENOMEM;}
static void __exit rtas_flash_cleanup(void){ int i;
rtas_flash_term_hook = NULL;
if (rtas_firmware_flash_list) { free_flash_list(rtas_firmware_flash_list); rtas_firmware_flash_list = NULL; }
for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) { const struct rtas_flash_file *f = &rtas_flash_files[i]; remove_proc_entry(f->filename, NULL); }
kmem_cache_destroy(flash_block_cache); kfree(rtas_validate_flash_data.buf);}
module_init(rtas_flash_init);module_exit(rtas_flash_cleanup);MODULE_DESCRIPTION("PPC procfs firmware flash interface");MODULE_LICENSE("GPL");