#undef DEBUG_NVRAM
+#define NVRAM_HEADER_LEN sizeof(struct nvram_header)
+#define NVRAM_BLOCK_LEN NVRAM_HEADER_LEN
+#define NVRAM_MAX_REQ 2079
+#define NVRAM_MIN_REQ 1055
+
+/* If change this size, then change the size of NVNAME_LEN */
+struct nvram_header {
+ unsigned char signature;
+ unsigned char checksum;
+ unsigned short length;
+ char name[12];
+};
+
+struct nvram_partition {
+ struct list_head partition;
+ struct nvram_header header;
+ unsigned int index;
+};
+
static struct nvram_partition * nvram_part;
static long nvram_error_log_index = -1;
static long nvram_error_log_size = 0;
return c_sum;
}
-static int __init nvram_remove_os_partition(void)
+/**
+ * nvram_remove_partition - Remove one or more partitions in nvram
+ * @name: name of the partition to remove, or NULL for a
+ * signature only match
+ * @sig: signature of the partition(s) to remove
+ */
+
+static int __init nvram_remove_partition(const char *name, int sig)
{
- struct list_head *i;
- struct list_head *j;
- struct nvram_partition * part;
- struct nvram_partition * cur_part;
+ struct nvram_partition *part, *prev, *tmp;
int rc;
- list_for_each(i, &nvram_part->partition) {
- part = list_entry(i, struct nvram_partition, partition);
- if (part->header.signature != NVRAM_SIG_OS)
+ list_for_each_entry(part, &nvram_part->partition, partition) {
+ if (part->header.signature != sig)
continue;
-
- /* Make os partition a free partition */
+ if (name && strncmp(name, part->header.name, 12))
+ continue;
+
+ /* Make partition a free partition */
part->header.signature = NVRAM_SIG_FREE;
sprintf(part->header.name, "wwwwwwwwwwww");
part->header.checksum = nvram_checksum(&part->header);
-
- /* Merge contiguous free partitions backwards */
- list_for_each_prev(j, &part->partition) {
- cur_part = list_entry(j, struct nvram_partition, partition);
- if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) {
- break;
- }
-
- part->header.length += cur_part->header.length;
- part->header.checksum = nvram_checksum(&part->header);
- part->index = cur_part->index;
-
- list_del(&cur_part->partition);
- kfree(cur_part);
- j = &part->partition; /* fixup our loop */
- }
-
- /* Merge contiguous free partitions forwards */
- list_for_each(j, &part->partition) {
- cur_part = list_entry(j, struct nvram_partition, partition);
- if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) {
- break;
- }
-
- part->header.length += cur_part->header.length;
- part->header.checksum = nvram_checksum(&part->header);
-
- list_del(&cur_part->partition);
- kfree(cur_part);
- j = &part->partition; /* fixup our loop */
- }
-
rc = nvram_write_header(part);
if (rc <= 0) {
- printk(KERN_ERR "nvram_remove_os_partition: nvram_write failed (%d)\n", rc);
+ printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc);
return rc;
}
+ }
+ /* Merge contiguous ones */
+ prev = NULL;
+ list_for_each_entry_safe(part, tmp, &nvram_part->partition, partition) {
+ if (part->header.signature != NVRAM_SIG_FREE) {
+ prev = NULL;
+ continue;
+ }
+ if (prev) {
+ prev->header.length += part->header.length;
+ prev->header.checksum = nvram_checksum(&part->header);
+ rc = nvram_write_header(part);
+ if (rc <= 0) {
+ printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc);
+ return rc;
+ }
+ list_del(&part->partition);
+ kfree(part);
+ } else
+ prev = part;
}
return 0;
}
-/* nvram_create_os_partition
+/**
+ * nvram_create_partition - Create a partition in nvram
+ * @name: name of the partition to create
+ * @sig: signature of the partition to create
+ * @req_size: size of data to allocate in bytes
+ * @min_size: minimum acceptable size (0 means req_size)
*
- * Create a OS linux partition to buffer error logs.
- * Will create a partition starting at the first free
- * space found if space has enough room.
+ * Returns a negative error code or a positive nvram index
+ * of the beginning of the data area of the newly created
+ * partition. If you provided a min_size smaller than req_size
+ * you need to query for the actual size yourself after the
+ * call using nvram_partition_get_size().
*/
-static int __init nvram_create_os_partition(void)
+static loff_t __init nvram_create_partition(const char *name, int sig,
+ int req_size, int min_size)
{
struct nvram_partition *part;
struct nvram_partition *new_part;
struct nvram_partition *free_part = NULL;
- int seq_init[2] = { 0, 0 };
+ static char nv_init_vals[16];
loff_t tmp_index;
long size = 0;
int rc;
-
+
+ /* Convert sizes from bytes to blocks */
+ req_size = _ALIGN_UP(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
+ min_size = _ALIGN_UP(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
+
+ /* If no minimum size specified, make it the same as the
+ * requested size
+ */
+ if (min_size == 0)
+ min_size = req_size;
+ if (min_size > req_size)
+ return -EINVAL;
+
+ /* Now add one block to each for the header */
+ req_size += 1;
+ min_size += 1;
+
/* Find a free partition that will give us the maximum needed size
If can't find one that will give us the minimum size needed */
list_for_each_entry(part, &nvram_part->partition, partition) {
if (part->header.signature != NVRAM_SIG_FREE)
continue;
- if (part->header.length >= NVRAM_MAX_REQ) {
- size = NVRAM_MAX_REQ;
+ if (part->header.length >= req_size) {
+ size = req_size;
free_part = part;
break;
}
- if (!size && part->header.length >= NVRAM_MIN_REQ) {
- size = NVRAM_MIN_REQ;
+ if (part->header.length > size &&
+ part->header.length >= min_size) {
+ size = part->header.length;
free_part = part;
}
}
/* Create our OS partition */
new_part = kmalloc(sizeof(*new_part), GFP_KERNEL);
if (!new_part) {
- printk(KERN_ERR "nvram_create_os_partition: kmalloc failed\n");
+ pr_err("nvram_create_os_partition: kmalloc failed\n");
return -ENOMEM;
}
new_part->index = free_part->index;
- new_part->header.signature = NVRAM_SIG_OS;
+ new_part->header.signature = sig;
new_part->header.length = size;
- strcpy(new_part->header.name, "ppc64,linux");
+ strncpy(new_part->header.name, name, 12);
new_part->header.checksum = nvram_checksum(&new_part->header);
rc = nvram_write_header(new_part);
if (rc <= 0) {
- printk(KERN_ERR "nvram_create_os_partition: nvram_write_header "
- "failed (%d)\n", rc);
- return rc;
- }
-
- /* make sure and initialize to zero the sequence number and the error
- type logged */
- tmp_index = new_part->index + NVRAM_HEADER_LEN;
- rc = ppc_md.nvram_write((char *)&seq_init, sizeof(seq_init), &tmp_index);
- if (rc <= 0) {
- printk(KERN_ERR "nvram_create_os_partition: nvram_write "
+ pr_err("nvram_create_os_partition: nvram_write_header "
"failed (%d)\n", rc);
return rc;
}
-
- nvram_error_log_index = new_part->index + NVRAM_HEADER_LEN;
- nvram_error_log_size = ((part->header.length - 1) *
- NVRAM_BLOCK_LEN) - sizeof(struct err_log_info);
-
list_add_tail(&new_part->partition, &free_part->partition);
- if (free_part->header.length <= size) {
+ /* Adjust or remove the partition we stole the space from */
+ if (free_part->header.length > size) {
+ free_part->index += size * NVRAM_BLOCK_LEN;
+ free_part->header.length -= size;
+ free_part->header.checksum = nvram_checksum(&free_part->header);
+ rc = nvram_write_header(free_part);
+ if (rc <= 0) {
+ pr_err("nvram_create_os_partition: nvram_write_header "
+ "failed (%d)\n", rc);
+ return rc;
+ }
+ } else {
list_del(&free_part->partition);
kfree(free_part);
- return 0;
}
- /* Adjust the partition we stole the space from */
- free_part->index += size * NVRAM_BLOCK_LEN;
- free_part->header.length -= size;
- free_part->header.checksum = nvram_checksum(&free_part->header);
-
- rc = nvram_write_header(free_part);
- if (rc <= 0) {
- printk(KERN_ERR "nvram_create_os_partition: nvram_write_header "
- "failed (%d)\n", rc);
- return rc;
+ /* Clear the new partition */
+ for (tmp_index = new_part->index + NVRAM_HEADER_LEN;
+ tmp_index < ((size - 1) * NVRAM_BLOCK_LEN);
+ tmp_index += NVRAM_BLOCK_LEN) {
+ rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index);
+ if (rc <= 0) {
+ pr_err("nvram_create_partition: nvram_write failed (%d)\n", rc);
+ return rc;
+ }
}
+
+ return new_part->index + NVRAM_HEADER_LEN;
+}
- return 0;
+/**
+ * nvram_get_partition_size - Get the data size of an nvram partition
+ * @data_index: This is the offset of the start of the data of
+ * the partition. The same value that is returned by
+ * nvram_create_partition().
+ */
+static int nvram_get_partition_size(loff_t data_index)
+{
+ struct nvram_partition *part;
+
+ list_for_each_entry(part, &nvram_part->partition, partition) {
+ if (part->index + NVRAM_HEADER_LEN == data_index)
+ return (part->header.length - 1) * NVRAM_BLOCK_LEN;
+ }
+ return -1;
}
if (strcmp(part->header.name, "ppc64,linux"))
continue;
- if (part->header.length >= NVRAM_MIN_REQ) {
+ if ((part->header.length - 1) * NVRAM_BLOCK_LEN >= NVRAM_MIN_REQ) {
/* found our partition */
nvram_error_log_index = part->index + NVRAM_HEADER_LEN;
nvram_error_log_size = ((part->header.length - 1) *
NVRAM_BLOCK_LEN) - sizeof(struct err_log_info);
return 0;
}
+
+ /* Found one but it's too small, remove it */
+ nvram_remove_partition("ppc64,linux", NVRAM_SIG_OS);
}
/* try creating a partition with the free space we have */
- rc = nvram_create_os_partition();
- if (!rc) {
- return 0;
- }
-
- /* need to free up some space */
- rc = nvram_remove_os_partition();
- if (rc) {
- return rc;
- }
+ rc = nvram_create_partition("ppc64,linux", NVRAM_SIG_OS,
+ NVRAM_MAX_REQ, NVRAM_MIN_REQ);
+ if (rc < 0) {
+ /* need to free up some space, remove any "OS" partition */
+ nvram_remove_partition(NULL, NVRAM_SIG_OS);
- /* create a partition in this new space */
- rc = nvram_create_os_partition();
- if (rc) {
- printk(KERN_ERR "nvram_create_os_partition: Could not find a "
- "NVRAM partition large enough\n");
- return rc;
+ /* Try again */
+ rc = nvram_create_partition("ppc64,linux", NVRAM_SIG_OS,
+ NVRAM_MAX_REQ, NVRAM_MIN_REQ);
+ if (rc < 0) {
+ pr_err("nvram_create_partition: Could not find"
+ " enough space in NVRAM for partition\n");
+ return rc;
+ }
}
+ nvram_error_log_index = rc;
+ nvram_error_log_size = nvram_get_partition_size(rc) - sizeof(struct err_log_info);
return 0;
}
-
static int __init nvram_scan_partitions(void)
{
loff_t cur_index = 0;
int error;
int rc;
+ BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16);
+
if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
return -ENODEV;
git.openpandora.org / pandora-kernel.git / blobdiff