#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/io.h>
+#include "persistent_ram.h"
#include "ram_console.h"
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
-#include <linux/rslib.h>
-#endif
-
-struct ram_console_buffer {
- uint32_t sig;
- uint32_t start;
- uint32_t size;
- uint8_t data[0];
-};
-
-#define RAM_CONSOLE_SIG (0x43474244) /* DBGC */
-
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_EARLY_INIT
-static char __initdata
- ram_console_old_log_init_buffer[CONFIG_ANDROID_RAM_CONSOLE_EARLY_SIZE];
-#endif
-static char *ram_console_old_log;
-static size_t ram_console_old_log_size;
-
-static struct ram_console_buffer *ram_console_buffer;
-static size_t ram_console_buffer_size;
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
-static char *ram_console_par_buffer;
-static struct rs_control *ram_console_rs_decoder;
-static int ram_console_corrected_bytes;
-static int ram_console_bad_blocks;
-#define ECC_BLOCK_SIZE CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION_DATA_SIZE
-#define ECC_SIZE CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION_ECC_SIZE
-#define ECC_SYMSIZE CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE
-#define ECC_POLY CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION_POLYNOMIAL
-#endif
-
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
-static void ram_console_encode_rs8(uint8_t *data, size_t len, uint8_t *ecc)
-{
- int i;
- uint16_t par[ECC_SIZE];
- /* Initialize the parity buffer */
- memset(par, 0, sizeof(par));
- encode_rs8(ram_console_rs_decoder, data, len, par, 0);
- for (i = 0; i < ECC_SIZE; i++)
- ecc[i] = par[i];
-}
-
-static int ram_console_decode_rs8(void *data, size_t len, uint8_t *ecc)
-{
- int i;
- uint16_t par[ECC_SIZE];
- for (i = 0; i < ECC_SIZE; i++)
- par[i] = ecc[i];
- return decode_rs8(ram_console_rs_decoder, data, par, len,
- NULL, 0, NULL, 0, NULL);
-}
-#endif
-
-static void ram_console_update(const char *s, unsigned int count)
-{
- struct ram_console_buffer *buffer = ram_console_buffer;
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
- uint8_t *buffer_end = buffer->data + ram_console_buffer_size;
- uint8_t *block;
- uint8_t *par;
- int size = ECC_BLOCK_SIZE;
-#endif
- memcpy(buffer->data + buffer->start, s, count);
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
- block = buffer->data + (buffer->start & ~(ECC_BLOCK_SIZE - 1));
- par = ram_console_par_buffer +
- (buffer->start / ECC_BLOCK_SIZE) * ECC_SIZE;
- do {
- if (block + ECC_BLOCK_SIZE > buffer_end)
- size = buffer_end - block;
- ram_console_encode_rs8(block, size, par);
- block += ECC_BLOCK_SIZE;
- par += ECC_SIZE;
- } while (block < buffer->data + buffer->start + count);
-#endif
-}
-
-static void ram_console_update_header(void)
-{
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
- struct ram_console_buffer *buffer = ram_console_buffer;
- uint8_t *par;
- par = ram_console_par_buffer +
- DIV_ROUND_UP(ram_console_buffer_size, ECC_BLOCK_SIZE) * ECC_SIZE;
- ram_console_encode_rs8((uint8_t *)buffer, sizeof(*buffer), par);
-#endif
-}
+static struct persistent_ram_zone *ram_console_zone;
+static const char *bootinfo;
+static size_t bootinfo_size;
static void
ram_console_write(struct console *console, const char *s, unsigned int count)
{
- int rem;
- struct ram_console_buffer *buffer = ram_console_buffer;
-
- if (count > ram_console_buffer_size) {
- s += count - ram_console_buffer_size;
- count = ram_console_buffer_size;
- }
- rem = ram_console_buffer_size - buffer->start;
- if (rem < count) {
- ram_console_update(s, rem);
- s += rem;
- count -= rem;
- buffer->start = 0;
- buffer->size = ram_console_buffer_size;
- }
- ram_console_update(s, count);
-
- buffer->start += count;
- if (buffer->size < ram_console_buffer_size)
- buffer->size += count;
- ram_console_update_header();
+ struct persistent_ram_zone *prz = console->data;
+ persistent_ram_write(prz, s, count);
}
static struct console ram_console = {
.name = "ram",
.write = ram_console_write,
- .flags = CON_PRINTBUFFER | CON_ENABLED,
+ .flags = CON_PRINTBUFFER | CON_ENABLED | CON_ANYTIME,
.index = -1,
};
ram_console.flags &= ~CON_ENABLED;
}
-static void __init
-ram_console_save_old(struct ram_console_buffer *buffer, const char *bootinfo,
- char *dest)
-{
- size_t old_log_size = buffer->size;
- size_t bootinfo_size = 0;
- size_t total_size = old_log_size;
- char *ptr;
- const char *bootinfo_label = "Boot info:\n";
-
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
- uint8_t *block;
- uint8_t *par;
- char strbuf[80];
- int strbuf_len = 0;
-
- block = buffer->data;
- par = ram_console_par_buffer;
- while (block < buffer->data + buffer->size) {
- int numerr;
- int size = ECC_BLOCK_SIZE;
- if (block + size > buffer->data + ram_console_buffer_size)
- size = buffer->data + ram_console_buffer_size - block;
- numerr = ram_console_decode_rs8(block, size, par);
- if (numerr > 0) {
-#if 0
- printk(KERN_INFO "ram_console: error in block %p, %d\n",
- block, numerr);
-#endif
- ram_console_corrected_bytes += numerr;
- } else if (numerr < 0) {
-#if 0
- printk(KERN_INFO "ram_console: uncorrectable error in "
- "block %p\n", block);
-#endif
- ram_console_bad_blocks++;
- }
- block += ECC_BLOCK_SIZE;
- par += ECC_SIZE;
- }
- if (ram_console_corrected_bytes || ram_console_bad_blocks)
- strbuf_len = snprintf(strbuf, sizeof(strbuf),
- "\n%d Corrected bytes, %d unrecoverable blocks\n",
- ram_console_corrected_bytes, ram_console_bad_blocks);
- else
- strbuf_len = snprintf(strbuf, sizeof(strbuf),
- "\nNo errors detected\n");
- if (strbuf_len >= sizeof(strbuf))
- strbuf_len = sizeof(strbuf) - 1;
- total_size += strbuf_len;
-#endif
-
- if (bootinfo)
- bootinfo_size = strlen(bootinfo) + strlen(bootinfo_label);
- total_size += bootinfo_size;
-
- if (dest == NULL) {
- dest = kmalloc(total_size, GFP_KERNEL);
- if (dest == NULL) {
- printk(KERN_ERR
- "ram_console: failed to allocate buffer\n");
- return;
- }
- }
-
- ram_console_old_log = dest;
- ram_console_old_log_size = total_size;
- memcpy(ram_console_old_log,
- &buffer->data[buffer->start], buffer->size - buffer->start);
- memcpy(ram_console_old_log + buffer->size - buffer->start,
- &buffer->data[0], buffer->start);
- ptr = ram_console_old_log + old_log_size;
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
- memcpy(ptr, strbuf, strbuf_len);
- ptr += strbuf_len;
-#endif
- if (bootinfo) {
- memcpy(ptr, bootinfo_label, strlen(bootinfo_label));
- ptr += strlen(bootinfo_label);
- memcpy(ptr, bootinfo, bootinfo_size);
- ptr += bootinfo_size;
- }
-}
-
-static int __init ram_console_init(struct ram_console_buffer *buffer,
- size_t buffer_size, const char *bootinfo,
- char *old_buf)
+static int __init ram_console_probe(struct platform_device *pdev)
{
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
- int numerr;
- uint8_t *par;
-#endif
- ram_console_buffer = buffer;
- ram_console_buffer_size =
- buffer_size - sizeof(struct ram_console_buffer);
-
- if (ram_console_buffer_size > buffer_size) {
- pr_err("ram_console: buffer %p, invalid size %zu, "
- "datasize %zu\n", buffer, buffer_size,
- ram_console_buffer_size);
- return 0;
- }
-
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
- ram_console_buffer_size -= (DIV_ROUND_UP(ram_console_buffer_size,
- ECC_BLOCK_SIZE) + 1) * ECC_SIZE;
-
- if (ram_console_buffer_size > buffer_size) {
- pr_err("ram_console: buffer %p, invalid size %zu, "
- "non-ecc datasize %zu\n",
- buffer, buffer_size, ram_console_buffer_size);
- return 0;
- }
-
- ram_console_par_buffer = buffer->data + ram_console_buffer_size;
-
-
- /* first consecutive root is 0
- * primitive element to generate roots = 1
- */
- ram_console_rs_decoder = init_rs(ECC_SYMSIZE, ECC_POLY, 0, 1, ECC_SIZE);
- if (ram_console_rs_decoder == NULL) {
- printk(KERN_INFO "ram_console: init_rs failed\n");
- return 0;
- }
-
- ram_console_corrected_bytes = 0;
- ram_console_bad_blocks = 0;
+ struct ram_console_platform_data *pdata = pdev->dev.platform_data;
+ struct persistent_ram_zone *prz;
- par = ram_console_par_buffer +
- DIV_ROUND_UP(ram_console_buffer_size, ECC_BLOCK_SIZE) * ECC_SIZE;
+ prz = persistent_ram_init_ringbuffer(&pdev->dev, true);
+ if (IS_ERR(prz))
+ return PTR_ERR(prz);
- numerr = ram_console_decode_rs8(buffer, sizeof(*buffer), par);
- if (numerr > 0) {
- printk(KERN_INFO "ram_console: error in header, %d\n", numerr);
- ram_console_corrected_bytes += numerr;
- } else if (numerr < 0) {
- printk(KERN_INFO
- "ram_console: uncorrectable error in header\n");
- ram_console_bad_blocks++;
- }
-#endif
- if (buffer->sig == RAM_CONSOLE_SIG) {
- if (buffer->size > ram_console_buffer_size
- || buffer->start > buffer->size)
- printk(KERN_INFO "ram_console: found existing invalid "
- "buffer, size %d, start %d\n",
- buffer->size, buffer->start);
- else {
- printk(KERN_INFO "ram_console: found existing buffer, "
- "size %d, start %d\n",
- buffer->size, buffer->start);
- ram_console_save_old(buffer, bootinfo, old_buf);
- }
- } else {
- printk(KERN_INFO "ram_console: no valid data in buffer "
- "(sig = 0x%08x)\n", buffer->sig);
+ if (pdata) {
+ bootinfo = kstrdup(pdata->bootinfo, GFP_KERNEL);
+ if (bootinfo)
+ bootinfo_size = strlen(bootinfo);
}
- buffer->sig = RAM_CONSOLE_SIG;
- buffer->start = 0;
- buffer->size = 0;
+ ram_console_zone = prz;
+ ram_console.data = prz;
register_console(&ram_console);
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_ENABLE_VERBOSE
- console_verbose();
-#endif
- return 0;
-}
-
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_EARLY_INIT
-static int __init ram_console_early_init(void)
-{
- return ram_console_init((struct ram_console_buffer *)
- CONFIG_ANDROID_RAM_CONSOLE_EARLY_ADDR,
- CONFIG_ANDROID_RAM_CONSOLE_EARLY_SIZE,
- NULL,
- ram_console_old_log_init_buffer);
-}
-#else
-static int ram_console_driver_probe(struct platform_device *pdev)
-{
- struct resource *res = pdev->resource;
- size_t start;
- size_t buffer_size;
- void *buffer;
- const char *bootinfo = NULL;
- struct ram_console_platform_data *pdata = pdev->dev.platform_data;
-
- if (res == NULL || pdev->num_resources != 1 ||
- !(res->flags & IORESOURCE_MEM)) {
- printk(KERN_ERR "ram_console: invalid resource, %p %d flags "
- "%lx\n", res, pdev->num_resources, res ? res->flags : 0);
- return -ENXIO;
- }
- buffer_size = resource_size(res);
- start = res->start;
- printk(KERN_INFO "ram_console: got buffer at %zx, size %zx\n",
- start, buffer_size);
- buffer = ioremap(res->start, buffer_size);
- if (buffer == NULL) {
- printk(KERN_ERR "ram_console: failed to map memory\n");
- return -ENOMEM;
- }
- if (pdata)
- bootinfo = pdata->bootinfo;
-
- return ram_console_init(buffer, buffer_size, bootinfo, NULL/* allocate */);
+ return 0;
}
static struct platform_driver ram_console_driver = {
- .probe = ram_console_driver_probe,
.driver = {
.name = "ram_console",
},
static int __init ram_console_module_init(void)
{
- int err;
- err = platform_driver_register(&ram_console_driver);
- return err;
+ return platform_driver_probe(&ram_console_driver, ram_console_probe);
}
+
+#ifndef CONFIG_PRINTK
+#define dmesg_restrict 0
#endif
static ssize_t ram_console_read_old(struct file *file, char __user *buf,
{
loff_t pos = *offset;
ssize_t count;
+ struct persistent_ram_zone *prz = ram_console_zone;
+ size_t old_log_size = persistent_ram_old_size(prz);
+ const char *old_log = persistent_ram_old(prz);
+ char *str;
+ int ret;
+
+ if (dmesg_restrict && !capable(CAP_SYSLOG))
+ return -EPERM;
+
+ /* Main last_kmsg log */
+ if (pos < old_log_size) {
+ count = min(len, (size_t)(old_log_size - pos));
+ if (copy_to_user(buf, old_log + pos, count))
+ return -EFAULT;
+ goto out;
+ }
- if (pos >= ram_console_old_log_size)
- return 0;
+ /* ECC correction notice */
+ pos -= old_log_size;
+ count = persistent_ram_ecc_string(prz, NULL, 0);
+ if (pos < count) {
+ str = kmalloc(count, GFP_KERNEL);
+ if (!str)
+ return -ENOMEM;
+ persistent_ram_ecc_string(prz, str, count + 1);
+ count = min(len, (size_t)(count - pos));
+ ret = copy_to_user(buf, str + pos, count);
+ kfree(str);
+ if (ret)
+ return -EFAULT;
+ goto out;
+ }
+
+ /* Boot info passed through pdata */
+ pos -= count;
+ if (pos < bootinfo_size) {
+ count = min(len, (size_t)(bootinfo_size - pos));
+ if (copy_to_user(buf, bootinfo + pos, count))
+ return -EFAULT;
+ goto out;
+ }
- count = min(len, (size_t)(ram_console_old_log_size - pos));
- if (copy_to_user(buf, ram_console_old_log + pos, count))
- return -EFAULT;
+ /* EOF */
+ return 0;
+out:
*offset += count;
return count;
}
static int __init ram_console_late_init(void)
{
struct proc_dir_entry *entry;
+ struct persistent_ram_zone *prz = ram_console_zone;
- if (ram_console_old_log == NULL)
+ if (!prz)
return 0;
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_EARLY_INIT
- ram_console_old_log = kmemdup(ram_console_old_log_init_buffer,
- ram_console_old_log_size, GFP_KERNEL);
- if (ram_console_old_log == NULL) {
- printk(KERN_ERR
- "ram_console: failed to allocate buffer for old log\n");
- ram_console_old_log_size = 0;
+
+ if (persistent_ram_old_size(prz) == 0)
return 0;
- }
-#endif
+
entry = create_proc_entry("last_kmsg", S_IFREG | S_IRUGO, NULL);
if (!entry) {
printk(KERN_ERR "ram_console: failed to create proc entry\n");
- kfree(ram_console_old_log);
- ram_console_old_log = NULL;
+ persistent_ram_free_old(prz);
return 0;
}
entry->proc_fops = &ram_console_file_ops;
- entry->size = ram_console_old_log_size;
+ entry->size = persistent_ram_old_size(prz) +
+ persistent_ram_ecc_string(prz, NULL, 0) +
+ bootinfo_size;
+
return 0;
}
-#ifdef CONFIG_ANDROID_RAM_CONSOLE_EARLY_INIT
-console_initcall(ram_console_early_init);
-#else
-postcore_initcall(ram_console_module_init);
-#endif
late_initcall(ram_console_late_init);
-
+module_init(ram_console_module_init);
git.openpandora.org / pandora-kernel.git / blobdiff