linux/arch/powerpc/kernel/rtas_flash.c
Ravi K. Nittala df17f56d8a powerpc/pseries: Cancel RTAS event scan before firmware flash
The RTAS firmware flash update is conducted using an RTAS call that is
serialized by lock_rtas() which uses spin_lock. While the flash is in
progress, rtasd performs scan for any RTAS events that are generated by
the system. rtasd keeps scanning for the RTAS events generated on the
machine. This is performed via workqueue mechanism. The rtas_event_scan()
also uses an RTAS call to scan the events, eventually trying to acquire
the spin_lock before issuing the request.

The flash update takes a while to complete and during this time, any other
RTAS call has to wait. In this case, rtas_event_scan() waits for a long time
on the spin_lock resulting in a soft lockup.

Fix: Just before the flash update is performed, the queued rtas_event_scan()
work item is cancelled from the work queue so that there is no other RTAS
call issued while the flash is in progress. After the flash completes, the
system reboots and the rtas_event_scan() is rescheduled.

Signed-off-by: Suzuki Poulose <suzuki@in.ibm.com>
Signed-off-by: Ravi Nittala <ravi.nittala@in.ibm.com>
Reported-by: Divya Vikas <divya.vikas@in.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-11-25 14:11:29 +11:00

808 lines
22 KiB
C

/*
* c 2001 PPC 64 Team, IBM Corp
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* /proc/powerpc/rtas/firmware_flash interface
*
* This file implements a firmware_flash interface to pump a firmware
* image into the kernel. At reboot time rtas_restart() will see the
* firmware image and flash it as it reboots (see rtas.c).
*/
#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 <asm/uaccess.h>
#include <asm/rtas.h>
#include <asm/abs_addr.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 */
#define VALIDATE_TMP_UPDATE 0 /* Validate Return Status */
#define VALIDATE_FLASH_AUTH 1 /* Validate Return Status */
#define VALIDATE_INVALID_IMG 2 /* Validate Return Status */
#define VALIDATE_CUR_UNKNOWN 3 /* Validate Return Status */
#define VALIDATE_TMP_COMMIT_DL 4 /* Validate Return Status */
#define VALIDATE_TMP_COMMIT 5 /* Validate Return Status */
#define VALIDATE_TMP_UPDATE_DL 6 /* Validate Return Status */
/* 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 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.
* We only allow one open of the flash proc file and create this
* list as we go. The rtas_firmware_flash_list varable 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 */
unsigned int op; /* Reject or commit image */
};
/* Status int must be first member of struct */
struct rtas_validate_flash_t
{
int status; /* Returned status */
char buf[VALIDATE_BUF_SIZE]; /* Candidate image buffer */
unsigned int buf_size; /* Size of image buf */
unsigned int update_results; /* Update results token */
};
static DEFINE_SPINLOCK(flash_file_open_lock);
static struct proc_dir_entry *firmware_flash_pde;
static struct proc_dir_entry *firmware_update_pde;
static struct proc_dir_entry *validate_pde;
static struct proc_dir_entry *manage_pde;
/* 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 proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
struct rtas_update_flash_t *uf;
uf = (struct rtas_update_flash_t *) dp->data;
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;
}
atomic_dec(&dp->count);
return 0;
}
static void get_flash_status_msg(int status, char *buf)
{
char *msg;
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:
sprintf(buf, "error: unexpected status value %d\n", status);
return;
}
strcpy(buf, msg);
}
/* Reading the proc file will show status (not the firmware contents) */
static ssize_t rtas_flash_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
struct rtas_update_flash_t *uf;
char msg[RTAS_MSG_MAXLEN];
uf = dp->data;
if (!strcmp(dp->name, FIRMWARE_FLASH_NAME)) {
get_flash_status_msg(uf->status, msg);
} else { /* FIRMWARE_UPDATE_NAME */
sprintf(msg, "%d\n", uf->status);
}
return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg));
}
/* constructor for flash_block_cache */
void rtas_block_ctor(void *ptr)
{
memset(ptr, 0, RTAS_BLK_SIZE);
}
/* 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 proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
struct rtas_update_flash_t *uf;
char *p;
int next_free;
struct flash_block_list *fl;
uf = (struct rtas_update_flash_t *) dp->data;
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_alloc(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_alloc(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_alloc(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;
}
static int rtas_excl_open(struct inode *inode, struct file *file)
{
struct proc_dir_entry *dp = PDE(inode);
/* Enforce exclusive open with use count of PDE */
spin_lock(&flash_file_open_lock);
if (atomic_read(&dp->count) > 2) {
spin_unlock(&flash_file_open_lock);
return -EBUSY;
}
atomic_inc(&dp->count);
spin_unlock(&flash_file_open_lock);
return 0;
}
static int rtas_excl_release(struct inode *inode, struct file *file)
{
struct proc_dir_entry *dp = PDE(inode);
atomic_dec(&dp->count);
return 0;
}
static void manage_flash(struct rtas_manage_flash_t *args_buf)
{
s32 rc;
do {
rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1,
1, NULL, args_buf->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 proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
struct rtas_manage_flash_t *args_buf;
char msg[RTAS_MSG_MAXLEN];
int msglen;
args_buf = dp->data;
if (args_buf == NULL)
return 0;
msglen = sprintf(msg, "%d\n", args_buf->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 proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
struct rtas_manage_flash_t *args_buf;
const char reject_str[] = "0";
const char commit_str[] = "1";
char stkbuf[10];
int op;
args_buf = (struct rtas_manage_flash_t *) dp->data;
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;
args_buf->op = op;
manage_flash(args_buf);
return count;
}
static void validate_flash(struct rtas_validate_flash_t *args_buf)
{
int token = rtas_token("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 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 += sprintf(msg + 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 proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
struct rtas_validate_flash_t *args_buf;
char msg[RTAS_MSG_MAXLEN];
int msglen;
args_buf = dp->data;
msglen = get_validate_flash_msg(args_buf, msg);
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 proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
struct rtas_validate_flash_t *args_buf;
int rc;
args_buf = (struct rtas_validate_flash_t *) dp->data;
if (dp->data == NULL) {
dp->data = kmalloc(sizeof(struct rtas_validate_flash_t),
GFP_KERNEL);
if (dp->data == NULL)
return -ENOMEM;
}
/* 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(VERIFY_READ, buf, count)) {
rc = -EFAULT;
goto done;
}
if (copy_from_user(args_buf->buf + *off, buf, count)) {
rc = -EFAULT;
goto done;
}
*off += count;
rc = count;
done:
if (rc < 0) {
kfree(dp->data);
dp->data = NULL;
}
return rc;
}
static int validate_flash_release(struct inode *inode, struct file *file)
{
struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
struct rtas_validate_flash_t *args_buf;
args_buf = (struct rtas_validate_flash_t *) dp->data;
if (args_buf->status == VALIDATE_READY) {
args_buf->buf_size = VALIDATE_BUF_SIZE;
validate_flash(args_buf);
}
/* The matching atomic_inc was in rtas_excl_open() */
atomic_dec(&dp->count);
return 0;
}
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_token("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 = virt_to_abs(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 *)virt_to_abs(f->blocks[i].data);
image_size += f->blocks[i].length;
}
next = f->next;
/* Don't translate NULL pointer for last entry */
if (f->next)
f->next = (struct flash_block_list *)virt_to_abs(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);
}
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);
}
static void remove_flash_pde(struct proc_dir_entry *dp)
{
if (dp) {
kfree(dp->data);
remove_proc_entry(dp->name, dp->parent);
}
}
static int initialize_flash_pde_data(const char *rtas_call_name,
size_t buf_size,
struct proc_dir_entry *dp)
{
int *status;
int token;
dp->data = kzalloc(buf_size, GFP_KERNEL);
if (dp->data == NULL) {
remove_flash_pde(dp);
return -ENOMEM;
}
/*
* This code assumes that the status int is the first member of the
* struct
*/
status = (int *) dp->data;
token = rtas_token(rtas_call_name);
if (token == RTAS_UNKNOWN_SERVICE)
*status = FLASH_AUTH;
else
*status = FLASH_NO_OP;
return 0;
}
static struct proc_dir_entry *create_flash_pde(const char *filename,
const struct file_operations *fops)
{
return proc_create(filename, S_IRUSR | S_IWUSR, NULL, fops);
}
static const struct file_operations rtas_flash_operations = {
.owner = THIS_MODULE,
.read = rtas_flash_read,
.write = rtas_flash_write,
.open = rtas_excl_open,
.release = rtas_flash_release,
.llseek = default_llseek,
};
static const struct file_operations manage_flash_operations = {
.owner = THIS_MODULE,
.read = manage_flash_read,
.write = manage_flash_write,
.open = rtas_excl_open,
.release = rtas_excl_release,
.llseek = default_llseek,
};
static const struct file_operations validate_flash_operations = {
.owner = THIS_MODULE,
.read = validate_flash_read,
.write = validate_flash_write,
.open = rtas_excl_open,
.release = validate_flash_release,
.llseek = default_llseek,
};
static int __init rtas_flash_init(void)
{
int rc;
if (rtas_token("ibm,update-flash-64-and-reboot") ==
RTAS_UNKNOWN_SERVICE) {
printk(KERN_ERR "rtas_flash: no firmware flash support\n");
return 1;
}
firmware_flash_pde = create_flash_pde("powerpc/rtas/"
FIRMWARE_FLASH_NAME,
&rtas_flash_operations);
if (firmware_flash_pde == NULL) {
rc = -ENOMEM;
goto cleanup;
}
rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot",
sizeof(struct rtas_update_flash_t),
firmware_flash_pde);
if (rc != 0)
goto cleanup;
firmware_update_pde = create_flash_pde("powerpc/rtas/"
FIRMWARE_UPDATE_NAME,
&rtas_flash_operations);
if (firmware_update_pde == NULL) {
rc = -ENOMEM;
goto cleanup;
}
rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot",
sizeof(struct rtas_update_flash_t),
firmware_update_pde);
if (rc != 0)
goto cleanup;
validate_pde = create_flash_pde("powerpc/rtas/" VALIDATE_FLASH_NAME,
&validate_flash_operations);
if (validate_pde == NULL) {
rc = -ENOMEM;
goto cleanup;
}
rc = initialize_flash_pde_data("ibm,validate-flash-image",
sizeof(struct rtas_validate_flash_t),
validate_pde);
if (rc != 0)
goto cleanup;
manage_pde = create_flash_pde("powerpc/rtas/" MANAGE_FLASH_NAME,
&manage_flash_operations);
if (manage_pde == NULL) {
rc = -ENOMEM;
goto cleanup;
}
rc = initialize_flash_pde_data("ibm,manage-flash-image",
sizeof(struct rtas_manage_flash_t),
manage_pde);
if (rc != 0)
goto cleanup;
rtas_flash_term_hook = rtas_flash_firmware;
flash_block_cache = kmem_cache_create("rtas_flash_cache",
RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0,
rtas_block_ctor);
if (!flash_block_cache) {
printk(KERN_ERR "%s: failed to create block cache\n",
__func__);
rc = -ENOMEM;
goto cleanup;
}
return 0;
cleanup:
remove_flash_pde(firmware_flash_pde);
remove_flash_pde(firmware_update_pde);
remove_flash_pde(validate_pde);
remove_flash_pde(manage_pde);
return rc;
}
static void __exit rtas_flash_cleanup(void)
{
rtas_flash_term_hook = NULL;
if (flash_block_cache)
kmem_cache_destroy(flash_block_cache);
remove_flash_pde(firmware_flash_pde);
remove_flash_pde(firmware_update_pde);
remove_flash_pde(validate_pde);
remove_flash_pde(manage_pde);
}
module_init(rtas_flash_init);
module_exit(rtas_flash_cleanup);
MODULE_LICENSE("GPL");