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-rw-r--r--arch/powerpc/kernel/rtas_flash.c777
1 files changed, 777 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/rtas_flash.c b/arch/powerpc/kernel/rtas_flash.c
new file mode 100644
index 000000000..56bd0aa30
--- /dev/null
+++ b/arch/powerpc/kernel/rtas_flash.c
@@ -0,0 +1,777 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * c 2001 PPC 64 Team, IBM Corp
+ *
+ * /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 <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 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 */
+};
+
+/* 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, rc;
+ struct flash_block_list *fl;
+
+ mutex_lock(&rtas_update_flash_mutex);
+
+ if (uf->status == FLASH_AUTH || count == 0)
+ goto out; /* 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)
+ goto nomem;
+ }
+
+ 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)
+ goto nomem;
+ 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)
+ goto nomem;
+
+ if(copy_from_user(p, buffer, count)) {
+ kmem_cache_free(flash_block_cache, p);
+ rc = -EFAULT;
+ goto error;
+ }
+ fl->blocks[next_free].data = p;
+ fl->blocks[next_free].length = count;
+ fl->num_blocks++;
+out:
+ mutex_unlock(&rtas_update_flash_mutex);
+ return count;
+
+nomem:
+ rc = -ENOMEM;
+error:
+ mutex_unlock(&rtas_update_flash_mutex);
+ return rc;
+}
+
+/*
+ * Flash management routines.
+ */
+static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op)
+{
+ s32 rc;
+
+ do {
+ rc = rtas_call(rtas_token("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, rc;
+
+ mutex_lock(&rtas_manage_flash_mutex);
+
+ if ((args_buf->status == MANAGE_AUTH) || (count == 0))
+ goto out;
+
+ op = -1;
+ if (buf) {
+ if (count > 9) count = 9;
+ rc = -EFAULT;
+ if (copy_from_user (stkbuf, buf, count))
+ goto error;
+ 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 */
+ rc = -EINVAL;
+ goto error;
+ }
+
+ manage_flash(args_buf, op);
+out:
+ mutex_unlock(&rtas_manage_flash_mutex);
+ return count;
+
+error:
+ mutex_unlock(&rtas_manage_flash_mutex);
+ return rc;
+}
+
+/*
+ * Validation routines.
+ */
+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 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;
+ int rc;
+
+ mutex_lock(&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;
+ mutex_unlock(&rtas_validate_flash_mutex);
+ 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)) {
+ rc = -EFAULT;
+ goto done;
+ }
+ if (copy_from_user(args_buf->buf + *off, buf, count)) {
+ rc = -EFAULT;
+ goto done;
+ }
+
+ *off += count;
+ rc = count;
+done:
+ mutex_unlock(&rtas_validate_flash_mutex);
+ return rc;
+}
+
+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_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 = __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 char *rtas_call_name;
+ int *status;
+ const struct proc_ops ops;
+};
+
+static const struct rtas_flash_file rtas_flash_files[] = {
+ {
+ .filename = "powerpc/rtas/" FIRMWARE_FLASH_NAME,
+ .rtas_call_name = "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,
+ .rtas_call_name = "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,
+ .rtas_call_name = "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,
+ .rtas_call_name = "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_token("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_token(f->rtas_call_name);
+ 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_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 06:26:14 +0000