diff options
Diffstat (limited to 'drivers/staging/android/ram_console.c')
-rw-r--r-- | drivers/staging/android/ram_console.c | 309 |
1 files changed, 36 insertions, 273 deletions
diff --git a/drivers/staging/android/ram_console.c b/drivers/staging/android/ram_console.c index 73215e2ee204..689c3dc47d2e 100644 --- a/drivers/staging/android/ram_console.c +++ b/drivers/staging/android/ram_console.c @@ -21,121 +21,18 @@ #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 */ - -static char *ram_console_old_log; -static size_t ram_console_old_log_size; +static struct persistent_ram_zone ram_console_zone; static const char *bootinfo; static size_t bootinfo_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 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 = { @@ -153,159 +50,6 @@ void ram_console_enable_console(int enabled) ram_console.flags &= ~CON_ENABLED; } -static void __init -ram_console_save_old(struct ram_console_buffer *buffer, char *dest) -{ - size_t old_log_size = buffer->size; - -#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION - uint8_t *block; - uint8_t *par; - - 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; - } -#endif - - if (dest == NULL) { - dest = kmalloc(old_log_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 = old_log_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); -} - -static int __init ram_console_init(struct ram_console_buffer *buffer, - size_t buffer_size, char *old_buf) -{ -#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; - - par = ram_console_par_buffer + - DIV_ROUND_UP(ram_console_buffer_size, ECC_BLOCK_SIZE) * ECC_SIZE; - - 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, old_buf); - } - } else { - printk(KERN_INFO "ram_console: no valid data in buffer " - "(sig = 0x%08x)\n", buffer->sig); - } - - buffer->sig = RAM_CONSOLE_SIG; - buffer->start = 0; - buffer->size = 0; - - register_console(&ram_console); - return 0; -} - -static ssize_t ram_console_ecc_string(char *str, size_t len) -{ -#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION - ssize_t ret; - - if (ram_console_corrected_bytes || ram_console_bad_blocks) - ret = snprintf(str, len, "" - "\n%d Corrected bytes, %d unrecoverable blocks\n", - ram_console_corrected_bytes, ram_console_bad_blocks); - else - ret = snprintf(str, len, "\nNo errors detected\n"); - - return ret; -#else - return 0; -#endif -} - static int ram_console_driver_probe(struct platform_device *pdev) { struct resource *res = pdev->resource; @@ -313,6 +57,7 @@ static int ram_console_driver_probe(struct platform_device *pdev) size_t buffer_size; void *buffer; struct ram_console_platform_data *pdata = pdev->dev.platform_data; + int ret; if (res == NULL || pdev->num_resources != 1 || !(res->flags & IORESOURCE_MEM)) { @@ -330,13 +75,25 @@ static int ram_console_driver_probe(struct platform_device *pdev) return -ENOMEM; } + ret = persistent_ram_init_ringbuffer(&ram_console_zone, buffer, + buffer_size); + if (ret) + goto err; + if (pdata) { bootinfo = kstrdup(pdata->bootinfo, GFP_KERNEL); if (bootinfo) bootinfo_size = strlen(bootinfo); } - return ram_console_init(buffer, buffer_size, NULL/* allocate */); + ram_console.data = &ram_console_zone; + + register_console(&ram_console); + return 0; + +err: + iounmap(buffer); + return ret; } static struct platform_driver ram_console_driver = { @@ -358,25 +115,28 @@ 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; /* Main last_kmsg log */ - if (pos < ram_console_old_log_size) { - count = min(len, (size_t)(ram_console_old_log_size - pos)); - if (copy_to_user(buf, ram_console_old_log + pos, count)) + 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; } /* ECC correction notice */ - pos -= ram_console_old_log_size; - count = ram_console_ecc_string(NULL, 0); + pos -= old_log_size; + count = persistent_ram_ecc_string(prz, NULL, 0); if (pos < count) { str = kmalloc(count, GFP_KERNEL); if (!str) return -ENOMEM; - ram_console_ecc_string(str, count + 1); + 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); @@ -410,22 +170,25 @@ static const struct file_operations ram_console_file_ops = { 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 (persistent_ram_old_size(prz) == 0) return 0; + 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; } -postcore_initcall(ram_console_module_init); late_initcall(ram_console_late_init); - +postcore_initcall(ram_console_module_init); |