From adc567e8a9c25f08e91eb18b83bdaa5ff9705919 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= Date: Fri, 19 Dec 2008 18:12:11 -0800 Subject: [PATCH] Staging: android: add ram_console driver MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Doesn't quite link properly under all configurations, and it has way too many different build options, but it's a start. Signed-off-by: Arve Hjønnevåg Signed-off-by: Brian Swetland Cc: Robert Love Signed-off-by: Greg Kroah-Hartman --- drivers/staging/android/Kconfig | 58 ++++ drivers/staging/android/Makefile | 1 + drivers/staging/android/ram_console.c | 395 ++++++++++++++++++++++++++ 3 files changed, 454 insertions(+) create mode 100644 drivers/staging/android/ram_console.c diff --git a/drivers/staging/android/Kconfig b/drivers/staging/android/Kconfig index c8899581545e..7728b84bf07c 100644 --- a/drivers/staging/android/Kconfig +++ b/drivers/staging/android/Kconfig @@ -14,4 +14,62 @@ config ANDROID_LOGGER tristate "Android log driver" default n +config ANDROID_RAM_CONSOLE + bool "Android RAM buffer console" + default n + +config ANDROID_RAM_CONSOLE_ENABLE_VERBOSE + bool "Enable verbose console messages on Android RAM console" + default y + depends on ANDROID_RAM_CONSOLE + +menuconfig ANDROID_RAM_CONSOLE_ERROR_CORRECTION + bool "Android RAM Console Enable error correction" + default n + depends on ANDROID_RAM_CONSOLE + select REED_SOLOMON + select REED_SOLOMON_ENC8 + select REED_SOLOMON_DEC8 + +if ANDROID_RAM_CONSOLE_ERROR_CORRECTION + +config ANDROID_RAM_CONSOLE_ERROR_CORRECTION_DATA_SIZE + int "Android RAM Console Data data size" + default 128 + help + Must be a power of 2. + +config ANDROID_RAM_CONSOLE_ERROR_CORRECTION_ECC_SIZE + int "Android RAM Console ECC size" + default 16 + +config ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE + int "Android RAM Console Symbol size" + default 8 + +config ANDROID_RAM_CONSOLE_ERROR_CORRECTION_POLYNOMIAL + hex "Android RAM Console Polynomial" + default 0x19 if (ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE = 4) + default 0x29 if (ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE = 5) + default 0x61 if (ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE = 6) + default 0x89 if (ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE = 7) + default 0x11d if (ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE = 8) + +endif # ANDROID_RAM_CONSOLE_ERROR_CORRECTION + +config ANDROID_RAM_CONSOLE_EARLY_INIT + bool "Start Android RAM console early" + default n + depends on ANDROID_RAM_CONSOLE + +config ANDROID_RAM_CONSOLE_EARLY_ADDR + hex "Android RAM console virtual address" + default 0 + depends on ANDROID_RAM_CONSOLE_EARLY_INIT + +config ANDROID_RAM_CONSOLE_EARLY_SIZE + hex "Android RAM console buffer size" + default 0 + depends on ANDROID_RAM_CONSOLE_EARLY_INIT + endmenu diff --git a/drivers/staging/android/Makefile b/drivers/staging/android/Makefile index b354b5d90143..357abd73142a 100644 --- a/drivers/staging/android/Makefile +++ b/drivers/staging/android/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_ANDROID) += android.o obj-$(CONFIG_ANDROID_BINDER_IPC) += binder.o obj-$(CONFIG_ANDROID_LOGGER) += logger.o +obj-$(CONFIG_ANDROID_RAM_CONSOLE) += ram_console.o diff --git a/drivers/staging/android/ram_console.c b/drivers/staging/android/ram_console.c new file mode 100644 index 000000000000..bf006857a87a --- /dev/null +++ b/drivers/staging/android/ram_console.c @@ -0,0 +1,395 @@ +/* drivers/android/ram_console.c + * + * Copyright (C) 2007-2008 Google, Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION +#include +#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 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(); +} + +static struct console ram_console = { + .name = "ram", + .write = ram_console_write, + .flags = CON_PRINTBUFFER | CON_ENABLED, + .index = -1, +}; + +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; + char strbuf[80]; + int strbuf_len; + + 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; + old_log_size += strbuf_len; +#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); +#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION + memcpy(ram_console_old_log + old_log_size - strbuf_len, + strbuf, strbuf_len); +#endif +} + +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); + +#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION + ram_console_buffer_size -= (DIV_ROUND_UP(ram_console_buffer_size, + ECC_BLOCK_SIZE) + 1) * ECC_SIZE; + 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); +#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, + 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; + + 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 = res->end - res->start + 1; + start = res->start; + printk(KERN_INFO "ram_console: got buffer at %x, size %x\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; + } + + return ram_console_init(buffer, buffer_size, NULL/* allocate */); +} + +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; +} +#endif + +static ssize_t ram_console_read_old(struct file *file, char __user *buf, + size_t len, loff_t *offset) +{ + loff_t pos = *offset; + ssize_t count; + + if (pos >= ram_console_old_log_size) + return 0; + + count = min(len, (size_t)(ram_console_old_log_size - pos)); + if (copy_to_user(buf, ram_console_old_log + pos, count)) + return -EFAULT; + + *offset += count; + return count; +} + +static struct file_operations ram_console_file_ops = { + .owner = THIS_MODULE, + .read = ram_console_read_old, +}; + +static int __init ram_console_late_init(void) +{ + struct proc_dir_entry *entry; + + if (ram_console_old_log == NULL) + return 0; +#ifdef CONFIG_ANDROID_RAM_CONSOLE_EARLY_INIT + ram_console_old_log = kmalloc(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; + return 0; + } + memcpy(ram_console_old_log, + ram_console_old_log_init_buffer, ram_console_old_log_size); +#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; + return 0; + } + + entry->proc_fops = &ram_console_file_ops; + entry->size = ram_console_old_log_size; + return 0; +} + +#ifdef CONFIG_ANDROID_RAM_CONSOLE_EARLY_INIT +console_initcall(ram_console_early_init); +#else +module_init(ram_console_module_init); +#endif +late_initcall(ram_console_late_init); + -- 2.20.1