From 437a58db57c61385baaa1cb8b7fa590b6a2f1607 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Fri, 18 Nov 2005 15:43:34 +1100 Subject: powerpc: Move remaining .c files from arch/ppc64 to arch/powerpc This also deletes the now-unused Makefiles under arch/ppc64. Both of the files moved over could use some merging, but for now I have moved them as-is and arranged for them to be used only in 64-bit kernels. For 32-bit kernels we still use arch/ppc/kernel/idle.c and drivers/char/generic_nvram.c as before. Signed-off-by: Paul Mackerras --- arch/powerpc/Makefile | 4 +- arch/powerpc/kernel/Makefile | 5 +- arch/powerpc/kernel/idle_64.c | 121 +++++++ arch/powerpc/kernel/nvram_64.c | 742 +++++++++++++++++++++++++++++++++++++++++ arch/ppc64/Makefile | 142 -------- arch/ppc64/kernel/Makefile | 7 - arch/ppc64/kernel/idle.c | 121 ------- arch/ppc64/kernel/nvram.c | 742 ----------------------------------------- 8 files changed, 869 insertions(+), 1015 deletions(-) create mode 100644 arch/powerpc/kernel/idle_64.c create mode 100644 arch/powerpc/kernel/nvram_64.c delete mode 100644 arch/ppc64/Makefile delete mode 100644 arch/ppc64/kernel/Makefile delete mode 100644 arch/ppc64/kernel/idle.c delete mode 100644 arch/ppc64/kernel/nvram.c diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 99dbea8c5c5..987036b60c8 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -125,11 +125,11 @@ head-$(CONFIG_PPC64) += arch/powerpc/kernel/entry_64.o head-$(CONFIG_PPC_FPU) += arch/powerpc/kernel/fpu.o core-y += arch/powerpc/kernel/ \ - arch/$(OLDARCH)/kernel/ \ arch/powerpc/mm/ \ arch/powerpc/lib/ \ arch/powerpc/sysdev/ \ arch/powerpc/platforms/ +core-$(CONFIG_PPC32) += arch/ppc/kernel/ core-$(CONFIG_MATH_EMULATION) += arch/ppc/math-emu/ core-$(CONFIG_XMON) += arch/powerpc/xmon/ core-$(CONFIG_APUS) += arch/ppc/amiga/ @@ -165,7 +165,7 @@ define archhelp @echo ' (your) ~/bin/installkernel or' @echo ' (distribution) /sbin/installkernel or' @echo ' install to $$(INSTALL_PATH) and run lilo' - @echo ' *_defconfig - Select default config from arch/$(ARCH)/ppc/configs' + @echo ' *_defconfig - Select default config from arch/$(ARCH)/configs' endef archclean: diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index 0e679afb2e2..9ed551b6c17 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -17,7 +17,7 @@ obj-y += vdso32/ obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \ signal_64.o ptrace32.o systbl.o \ paca.o ioctl32.o cpu_setup_power4.o \ - firmware.o sysfs.o udbg.o + firmware.o sysfs.o udbg.o idle_64.o obj-$(CONFIG_PPC64) += vdso64/ obj-$(CONFIG_ALTIVEC) += vecemu.o vector.o obj-$(CONFIG_POWER4) += idle_power4.o @@ -35,6 +35,7 @@ obj-$(CONFIG_PPC_PSERIES) += udbg_16550.o obj-$(CONFIG_PPC_MAPLE) += udbg_16550.o udbgscc-$(CONFIG_PPC64) := udbg_scc.o obj-$(CONFIG_PPC_PMAC) += $(udbgscc-y) +obj64-$(CONFIG_PPC_MULTIPLATFORM) += nvram_64.o ifeq ($(CONFIG_PPC_MERGE),y) @@ -78,5 +79,7 @@ smpobj-$(CONFIG_SMP) += smp.o endif +obj-$(CONFIG_PPC64) += $(obj64-y) + extra-$(CONFIG_PPC_FPU) += fpu.o extra-$(CONFIG_PPC64) += entry_64.o diff --git a/arch/powerpc/kernel/idle_64.c b/arch/powerpc/kernel/idle_64.c new file mode 100644 index 00000000000..b879d3057ef --- /dev/null +++ b/arch/powerpc/kernel/idle_64.c @@ -0,0 +1,121 @@ +/* + * Idle daemon for PowerPC. Idle daemon will handle any action + * that needs to be taken when the system becomes idle. + * + * Originally Written by Cort Dougan (cort@cs.nmt.edu) + * + * iSeries supported added by Mike Corrigan + * + * Additional shared processor, SMT, and firmware support + * Copyright (c) 2003 Dave Engebretsen + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +extern void power4_idle(void); + +void default_idle(void) +{ + unsigned int cpu = smp_processor_id(); + set_thread_flag(TIF_POLLING_NRFLAG); + + while (1) { + if (!need_resched()) { + while (!need_resched() && !cpu_is_offline(cpu)) { + ppc64_runlatch_off(); + + /* + * Go into low thread priority and possibly + * low power mode. + */ + HMT_low(); + HMT_very_low(); + } + + HMT_medium(); + } + + ppc64_runlatch_on(); + preempt_enable_no_resched(); + schedule(); + preempt_disable(); + if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING) + cpu_die(); + } +} + +void native_idle(void) +{ + while (1) { + ppc64_runlatch_off(); + + if (!need_resched()) + power4_idle(); + + if (need_resched()) { + ppc64_runlatch_on(); + preempt_enable_no_resched(); + schedule(); + preempt_disable(); + } + + if (cpu_is_offline(smp_processor_id()) && + system_state == SYSTEM_RUNNING) + cpu_die(); + } +} + +void cpu_idle(void) +{ + BUG_ON(NULL == ppc_md.idle_loop); + ppc_md.idle_loop(); +} + +int powersave_nap; + +#ifdef CONFIG_SYSCTL +/* + * Register the sysctl to set/clear powersave_nap. + */ +static ctl_table powersave_nap_ctl_table[]={ + { + .ctl_name = KERN_PPC_POWERSAVE_NAP, + .procname = "powersave-nap", + .data = &powersave_nap, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { 0, }, +}; +static ctl_table powersave_nap_sysctl_root[] = { + { 1, "kernel", NULL, 0, 0755, powersave_nap_ctl_table, }, + { 0,}, +}; + +static int __init +register_powersave_nap_sysctl(void) +{ + register_sysctl_table(powersave_nap_sysctl_root, 0); + + return 0; +} +__initcall(register_powersave_nap_sysctl); +#endif diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c new file mode 100644 index 00000000000..c0fcd29918c --- /dev/null +++ b/arch/powerpc/kernel/nvram_64.c @@ -0,0 +1,742 @@ +/* + * c 2001 PPC 64 Team, IBM Corp + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * /dev/nvram driver for PPC64 + * + * This perhaps should live in drivers/char + * + * TODO: Split the /dev/nvram part (that one can use + * drivers/char/generic_nvram.c) from the arch & partition + * parsing code. + */ + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#undef DEBUG_NVRAM + +static int nvram_scan_partitions(void); +static int nvram_setup_partition(void); +static int nvram_create_os_partition(void); +static int nvram_remove_os_partition(void); + +static struct nvram_partition * nvram_part; +static long nvram_error_log_index = -1; +static long nvram_error_log_size = 0; + +int no_logging = 1; /* Until we initialize everything, + * make sure we don't try logging + * anything */ + +extern volatile int error_log_cnt; + +struct err_log_info { + int error_type; + unsigned int seq_num; +}; + +static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin) +{ + int size; + + if (ppc_md.nvram_size == NULL) + return -ENODEV; + size = ppc_md.nvram_size(); + + switch (origin) { + case 1: + offset += file->f_pos; + break; + case 2: + offset += size; + break; + } + if (offset < 0) + return -EINVAL; + file->f_pos = offset; + return file->f_pos; +} + + +static ssize_t dev_nvram_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + ssize_t len; + char *tmp_buffer; + int size; + + if (ppc_md.nvram_size == NULL) + return -ENODEV; + size = ppc_md.nvram_size(); + + if (!access_ok(VERIFY_WRITE, buf, count)) + return -EFAULT; + if (*ppos >= size) + return 0; + if (count > size) + count = size; + + tmp_buffer = (char *) kmalloc(count, GFP_KERNEL); + if (!tmp_buffer) { + printk(KERN_ERR "dev_read_nvram: kmalloc failed\n"); + return -ENOMEM; + } + + len = ppc_md.nvram_read(tmp_buffer, count, ppos); + if ((long)len <= 0) { + kfree(tmp_buffer); + return len; + } + + if (copy_to_user(buf, tmp_buffer, len)) { + kfree(tmp_buffer); + return -EFAULT; + } + + kfree(tmp_buffer); + return len; + +} + +static ssize_t dev_nvram_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + ssize_t len; + char * tmp_buffer; + int size; + + if (ppc_md.nvram_size == NULL) + return -ENODEV; + size = ppc_md.nvram_size(); + + if (!access_ok(VERIFY_READ, buf, count)) + return -EFAULT; + if (*ppos >= size) + return 0; + if (count > size) + count = size; + + tmp_buffer = (char *) kmalloc(count, GFP_KERNEL); + if (!tmp_buffer) { + printk(KERN_ERR "dev_nvram_write: kmalloc failed\n"); + return -ENOMEM; + } + + if (copy_from_user(tmp_buffer, buf, count)) { + kfree(tmp_buffer); + return -EFAULT; + } + + len = ppc_md.nvram_write(tmp_buffer, count, ppos); + if ((long)len <= 0) { + kfree(tmp_buffer); + return len; + } + + kfree(tmp_buffer); + return len; +} + +static int dev_nvram_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + switch(cmd) { +#ifdef CONFIG_PPC_PMAC + case OBSOLETE_PMAC_NVRAM_GET_OFFSET: + printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n"); + case IOC_NVRAM_GET_OFFSET: { + int part, offset; + + if (_machine != PLATFORM_POWERMAC) + return -EINVAL; + if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0) + return -EFAULT; + if (part < pmac_nvram_OF || part > pmac_nvram_NR) + return -EINVAL; + offset = pmac_get_partition(part); + if (offset < 0) + return offset; + if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0) + return -EFAULT; + return 0; + } +#endif /* CONFIG_PPC_PMAC */ + } + return -EINVAL; +} + +struct file_operations nvram_fops = { + .owner = THIS_MODULE, + .llseek = dev_nvram_llseek, + .read = dev_nvram_read, + .write = dev_nvram_write, + .ioctl = dev_nvram_ioctl, +}; + +static struct miscdevice nvram_dev = { + NVRAM_MINOR, + "nvram", + &nvram_fops +}; + + +#ifdef DEBUG_NVRAM +static void nvram_print_partitions(char * label) +{ + struct list_head * p; + struct nvram_partition * tmp_part; + + printk(KERN_WARNING "--------%s---------\n", label); + printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n"); + list_for_each(p, &nvram_part->partition) { + tmp_part = list_entry(p, struct nvram_partition, partition); + printk(KERN_WARNING "%d \t%02x\t%02x\t%d\t%s\n", + tmp_part->index, tmp_part->header.signature, + tmp_part->header.checksum, tmp_part->header.length, + tmp_part->header.name); + } +} +#endif + + +static int nvram_write_header(struct nvram_partition * part) +{ + loff_t tmp_index; + int rc; + + tmp_index = part->index; + rc = ppc_md.nvram_write((char *)&part->header, NVRAM_HEADER_LEN, &tmp_index); + + return rc; +} + + +static unsigned char nvram_checksum(struct nvram_header *p) +{ + unsigned int c_sum, c_sum2; + unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */ + c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5]; + + /* The sum may have spilled into the 3rd byte. Fold it back. */ + c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff; + /* The sum cannot exceed 2 bytes. Fold it into a checksum */ + c_sum2 = (c_sum >> 8) + (c_sum << 8); + c_sum = ((c_sum + c_sum2) >> 8) & 0xff; + return c_sum; +} + + +/* + * Find an nvram partition, sig can be 0 for any + * partition or name can be NULL for any name, else + * tries to match both + */ +struct nvram_partition *nvram_find_partition(int sig, const char *name) +{ + struct nvram_partition * part; + struct list_head * p; + + list_for_each(p, &nvram_part->partition) { + part = list_entry(p, struct nvram_partition, partition); + + if (sig && part->header.signature != sig) + continue; + if (name && 0 != strncmp(name, part->header.name, 12)) + continue; + return part; + } + return NULL; +} +EXPORT_SYMBOL(nvram_find_partition); + + +static int nvram_remove_os_partition(void) +{ + struct list_head *i; + struct list_head *j; + struct nvram_partition * part; + struct nvram_partition * cur_part; + int rc; + + list_for_each(i, &nvram_part->partition) { + part = list_entry(i, struct nvram_partition, partition); + if (part->header.signature != NVRAM_SIG_OS) + continue; + + /* Make os 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); + return rc; + } + + } + + return 0; +} + +/* nvram_create_os_partition + * + * 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. + */ +static int nvram_create_os_partition(void) +{ + struct nvram_partition *part; + struct nvram_partition *new_part; + struct nvram_partition *free_part = NULL; + int seq_init[2] = { 0, 0 }; + loff_t tmp_index; + long size = 0; + int rc; + + /* 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; + free_part = part; + break; + } + if (!size && part->header.length >= NVRAM_MIN_REQ) { + size = NVRAM_MIN_REQ; + free_part = part; + } + } + if (!size) + return -ENOSPC; + + /* 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"); + return -ENOMEM; + } + + new_part->index = free_part->index; + new_part->header.signature = NVRAM_SIG_OS; + new_part->header.length = size; + strcpy(new_part->header.name, "ppc64,linux"); + 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 " + "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) { + 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; + } + + return 0; +} + + +/* nvram_setup_partition + * + * This will setup the partition we need for buffering the + * error logs and cleanup partitions if needed. + * + * The general strategy is the following: + * 1.) If there is ppc64,linux partition large enough then use it. + * 2.) If there is not a ppc64,linux partition large enough, search + * for a free partition that is large enough. + * 3.) If there is not a free partition large enough remove + * _all_ OS partitions and consolidate the space. + * 4.) Will first try getting a chunk that will satisfy the maximum + * error log size (NVRAM_MAX_REQ). + * 5.) If the max chunk cannot be allocated then try finding a chunk + * that will satisfy the minum needed (NVRAM_MIN_REQ). + */ +static int nvram_setup_partition(void) +{ + struct list_head * p; + struct nvram_partition * part; + int rc; + + /* For now, we don't do any of this on pmac, until I + * have figured out if it's worth killing some unused stuffs + * in our nvram, as Apple defined partitions use pretty much + * all of the space + */ + if (_machine == PLATFORM_POWERMAC) + return -ENOSPC; + + /* see if we have an OS partition that meets our needs. + will try getting the max we need. If not we'll delete + partitions and try again. */ + list_for_each(p, &nvram_part->partition) { + part = list_entry(p, struct nvram_partition, partition); + if (part->header.signature != NVRAM_SIG_OS) + continue; + + if (strcmp(part->header.name, "ppc64,linux")) + continue; + + if (part->header.length >= 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; + } + } + + /* 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; + } + + /* 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; + } + + return 0; +} + + +static int nvram_scan_partitions(void) +{ + loff_t cur_index = 0; + struct nvram_header phead; + struct nvram_partition * tmp_part; + unsigned char c_sum; + char * header; + int total_size; + int err; + + if (ppc_md.nvram_size == NULL) + return -ENODEV; + total_size = ppc_md.nvram_size(); + + header = (char *) kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL); + if (!header) { + printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n"); + return -ENOMEM; + } + + while (cur_index < total_size) { + + err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index); + if (err != NVRAM_HEADER_LEN) { + printk(KERN_ERR "nvram_scan_partitions: Error parsing " + "nvram partitions\n"); + goto out; + } + + cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */ + + memcpy(&phead, header, NVRAM_HEADER_LEN); + + err = 0; + c_sum = nvram_checksum(&phead); + if (c_sum != phead.checksum) { + printk(KERN_WARNING "WARNING: nvram partition checksum" + " was %02x, should be %02x!\n", + phead.checksum, c_sum); + printk(KERN_WARNING "Terminating nvram partition scan\n"); + goto out; + } + if (!phead.length) { + printk(KERN_WARNING "WARNING: nvram corruption " + "detected: 0-length partition\n"); + goto out; + } + tmp_part = (struct nvram_partition *) + kmalloc(sizeof(struct nvram_partition), GFP_KERNEL); + err = -ENOMEM; + if (!tmp_part) { + printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n"); + goto out; + } + + memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN); + tmp_part->index = cur_index; + list_add_tail(&tmp_part->partition, &nvram_part->partition); + + cur_index += phead.length * NVRAM_BLOCK_LEN; + } + err = 0; + + out: + kfree(header); + return err; +} + +static int __init nvram_init(void) +{ + int error; + int rc; + + if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) + return -ENODEV; + + rc = misc_register(&nvram_dev); + if (rc != 0) { + printk(KERN_ERR "nvram_init: failed to register device\n"); + return rc; + } + + /* initialize our anchor for the nvram partition list */ + nvram_part = (struct nvram_partition *) kmalloc(sizeof(struct nvram_partition), GFP_KERNEL); + if (!nvram_part) { + printk(KERN_ERR "nvram_init: Failed kmalloc\n"); + return -ENOMEM; + } + INIT_LIST_HEAD(&nvram_part->partition); + + /* Get all the NVRAM partitions */ + error = nvram_scan_partitions(); + if (error) { + printk(KERN_ERR "nvram_init: Failed nvram_scan_partitions\n"); + return error; + } + + if(nvram_setup_partition()) + printk(KERN_WARNING "nvram_init: Could not find nvram partition" + " for nvram buffered error logging.\n"); + +#ifdef DEBUG_NVRAM + nvram_print_partitions("NVRAM Partitions"); +#endif + + return rc; +} + +void __exit nvram_cleanup(void) +{ + misc_deregister( &nvram_dev ); +} + + +#ifdef CONFIG_PPC_PSERIES + +/* nvram_write_error_log + * + * We need to buffer the error logs into nvram to ensure that we have + * the failure information to decode. If we have a severe error there + * is no way to guarantee that the OS or the machine is in a state to + * get back to user land and write the error to disk. For example if + * the SCSI device driver causes a Machine Check by writing to a bad + * IO address, there is no way of guaranteeing that the device driver + * is in any state that is would also be able to write the error data + * captured to disk, thus we buffer it in NVRAM for analysis on the + * next boot. + * + * In NVRAM the partition containing the error log buffer will looks like: + * Header (in bytes): + * +-----------+----------+--------+------------+------------------+ + * | signature | checksum | length | name | data | + * |0 |1 |2 3|4 15|16 length-1| + * +-----------+----------+--------+------------+------------------+ + * + * The 'data' section would look like (in bytes): + * +--------------+------------+-----------------------------------+ + * | event_logged | sequence # | error log | + * |0 3|4 7|8 nvram_error_log_size-1| + * +--------------+------------+-----------------------------------+ + * + * event_logged: 0 if event has not been logged to syslog, 1 if it has + * sequence #: The unique sequence # for each event. (until it wraps) + * error log: The error log from event_scan + */ +int nvram_write_error_log(char * buff, int length, unsigned int err_type) +{ + int rc; + loff_t tmp_index; + struct err_log_info info; + + if (no_logging) { + return -EPERM; + } + + if (nvram_error_log_index == -1) { + return -ESPIPE; + } + + if (length > nvram_error_log_size) { + length = nvram_error_log_size; + } + + info.error_type = err_type; + info.seq_num = error_log_cnt; + + tmp_index = nvram_error_log_index; + + rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), &tmp_index); + if (rc <= 0) { + printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc); + return rc; + } + + rc = ppc_md.nvram_write(buff, length, &tmp_index); + if (rc <= 0) { + printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc); + return rc; + } + + return 0; +} + +/* nvram_read_error_log + * + * Reads nvram for error log for at most 'length' + */ +int nvram_read_error_log(char * buff, int length, unsigned int * err_type) +{ + int rc; + loff_t tmp_index; + struct err_log_info info; + + if (nvram_error_log_index == -1) + return -1; + + if (length > nvram_error_log_size) + length = nvram_error_log_size; + + tmp_index = nvram_error_log_index; + + rc = ppc_md.nvram_read((char *)&info, sizeof(struct err_log_info), &tmp_index); + if (rc <= 0) { + printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc); + return rc; + } + + rc = ppc_md.nvram_read(buff, length, &tmp_index); + if (rc <= 0) { + printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc); + return rc; + } + + error_log_cnt = info.seq_num; + *err_type = info.error_type; + + return 0; +} + +/* This doesn't actually zero anything, but it sets the event_logged + * word to tell that this event is safely in syslog. + */ +int nvram_clear_error_log(void) +{ + loff_t tmp_index; + int clear_word = ERR_FLAG_ALREADY_LOGGED; + int rc; + + tmp_index = nvram_error_log_index; + + rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index); + if (rc <= 0) { + printk(KERN_ERR "nvram_clear_error_log: Failed nvram_write (%d)\n", rc); + return rc; + } + + return 0; +} + +#endif /* CONFIG_PPC_PSERIES */ + +module_init(nvram_init); +module_exit(nvram_cleanup); +MODULE_LICENSE("GPL"); diff --git a/arch/ppc64/Makefile b/arch/ppc64/Makefile deleted file mode 100644 index a55a82d145d..00000000000 --- a/arch/ppc64/Makefile +++ /dev/null @@ -1,142 +0,0 @@ -# This file is included by the global makefile so that you can add your own -# architecture-specific flags and dependencies. Remember to do have actions -# for "archclean" and "archdep" for cleaning up and making dependencies for -# this architecture -# -# This file is subject to the terms and conditions of the GNU General Public -# License. See the file "COPYING" in the main directory of this archive -# for more details. -# -# Copyright (C) 1994 by Linus Torvalds -# Changes for PPC by Gary Thomas -# Rewritten by Cort Dougan and Paul Mackerras -# Adjusted for PPC64 by Tom Gall -# - -KERNELLOAD := 0xc000000000000000 - -# Set default 32 bits cross compilers for vdso and boot wrapper -CROSS32_COMPILE ?= - -CROSS32CC := $(CROSS32_COMPILE)gcc -CROSS32AS := $(CROSS32_COMPILE)as -CROSS32LD := $(CROSS32_COMPILE)ld -CROSS32OBJCOPY := $(CROSS32_COMPILE)objcopy - -# If we have a biarch compiler, use it for 32 bits cross compile if -# CROSS32_COMPILE wasn't explicitely defined, and add proper explicit -# target type to target compilers - -HAS_BIARCH := $(call cc-option-yn, -m64) -ifeq ($(HAS_BIARCH),y) -ifeq ($(CROSS32_COMPILE),) -CROSS32CC := $(CC) -m32 -CROSS32AS := $(AS) -a32 -CROSS32LD := $(LD) -m elf32ppc -CROSS32OBJCOPY := $(OBJCOPY) -endif -override AS += -a64 -override LD += -m elf64ppc -override CC += -m64 -endif - -export CROSS32CC CROSS32AS CROSS32LD CROSS32OBJCOPY - -new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi) - -ifeq ($(new_nm),y) -NM := $(NM) --synthetic - -endif - -CHECKFLAGS += -m64 -D__powerpc__ -D__powerpc64__ - -LDFLAGS := -m elf64ppc -LDFLAGS_vmlinux := -Bstatic -e $(KERNELLOAD) -Ttext $(KERNELLOAD) -CFLAGS += -msoft-float -pipe -mminimal-toc -mtraceback=none \ - -mcall-aixdesc -# Temporary hack until we have migrated to asm-powerpc -CPPFLAGS += -Iarch/$(ARCH)/include - -GCC_VERSION := $(call cc-version) -GCC_BROKEN_VEC := $(shell if [ $(GCC_VERSION) -lt 0400 ] ; then echo "y"; fi ;) - -ifeq ($(CONFIG_POWER4_ONLY),y) -ifeq ($(CONFIG_ALTIVEC),y) -ifeq ($(GCC_BROKEN_VEC),y) - CFLAGS += $(call cc-option,-mcpu=970) -else - CFLAGS += $(call cc-option,-mcpu=power4) -endif -else - CFLAGS += $(call cc-option,-mcpu=power4) -endif -else - CFLAGS += $(call cc-option,-mtune=power4) -endif - -# No AltiVec instruction when building kernel -CFLAGS += $(call cc-option, -mno-altivec) - -# Enable unit-at-a-time mode when possible. It shrinks the -# kernel considerably. -CFLAGS += $(call cc-option,-funit-at-a-time) - -head-y := arch/ppc64/kernel/head.o -head-y += arch/powerpc/kernel/fpu.o -head-y += arch/powerpc/kernel/entry_64.o - -core-y += arch/ppc64/kernel/ arch/powerpc/kernel/ -core-y += arch/powerpc/mm/ -core-y += arch/powerpc/sysdev/ -core-y += arch/powerpc/platforms/ -core-y += arch/powerpc/lib/ -core-$(CONFIG_XMON) += arch/powerpc/xmon/ -drivers-$(CONFIG_OPROFILE) += arch/powerpc/oprofile/ - -boot := arch/ppc64/boot - -boottargets-$(CONFIG_PPC_PSERIES) += zImage zImage.initrd -boottargets-$(CONFIG_PPC_PMAC) += zImage.vmode zImage.initrd.vmode -boottargets-$(CONFIG_PPC_MAPLE) += zImage zImage.initrd -boottargets-$(CONFIG_PPC_ISERIES) += vmlinux.sminitrd vmlinux.initrd vmlinux.sm -boottargets-$(CONFIG_PPC_BPA) += zImage zImage.initrd -$(boottargets-y): vmlinux - $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ - -bootimage-$(CONFIG_PPC_PSERIES) := $(boot)/zImage -bootimage-$(CONFIG_PPC_PMAC) := vmlinux -bootimage-$(CONFIG_PPC_MAPLE) := $(boot)/zImage -bootimage-$(CONFIG_PPC_BPA) := $(boot)/zImage -bootimage-$(CONFIG_PPC_ISERIES) := vmlinux -BOOTIMAGE := $(bootimage-y) -install: vmlinux - $(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) $@ - -defaultimage-$(CONFIG_PPC_PSERIES) := zImage -defaultimage-$(CONFIG_PPC_PMAC) := zImage.vmode -defaultimage-$(CONFIG_PPC_MAPLE) := zImage -defaultimage-$(CONFIG_PPC_ISERIES) := vmlinux -KBUILD_IMAGE := $(defaultimage-y) -all: $(KBUILD_IMAGE) - -archclean: - $(Q)$(MAKE) $(clean)=$(boot) - # Temporary hack until we have migrated to asm-powerpc - $(Q)rm -rf arch/$(ARCH)/include - - -# Temporary hack until we have migrated to asm-powerpc -include/asm: arch/$(ARCH)/include/asm -arch/$(ARCH)/include/asm: - $(Q)if [ ! -d arch/$(ARCH)/include ]; then mkdir -p arch/$(ARCH)/include; fi - $(Q)ln -fsn $(srctree)/include/asm-powerpc arch/$(ARCH)/include/asm - -define archhelp - echo ' zImage.vmode - Compressed kernel image (arch/$(ARCH)/boot/zImage.vmode)' - echo ' zImage.initrd.vmode - Compressed kernel image with initrd attached,' - echo ' sourced from arch/$(ARCH)/boot/ramdisk.image.gz' - echo ' (arch/$(ARCH)/boot/zImage.initrd.vmode)' - echo ' zImage - zImage for pSeries machines' - echo ' zImage.initrd - zImage with initrd for pSeries machines' -endef diff --git a/arch/ppc64/kernel/Makefile b/arch/ppc64/kernel/Makefile deleted file mode 100644 index 5f0abdb66e0..00000000000 --- a/arch/ppc64/kernel/Makefile +++ /dev/null @@ -1,7 +0,0 @@ -# -# Makefile for the linux ppc64 kernel. -# - -obj-y += idle.o - -obj-$(CONFIG_PPC_MULTIPLATFORM) += nvram.o diff --git a/arch/ppc64/kernel/idle.c b/arch/ppc64/kernel/idle.c deleted file mode 100644 index b879d3057ef..00000000000 --- a/arch/ppc64/kernel/idle.c +++ /dev/null @@ -1,121 +0,0 @@ -/* - * Idle daemon for PowerPC. Idle daemon will handle any action - * that needs to be taken when the system becomes idle. - * - * Originally Written by Cort Dougan (cort@cs.nmt.edu) - * - * iSeries supported added by Mike Corrigan - * - * Additional shared processor, SMT, and firmware support - * Copyright (c) 2003 Dave Engebretsen - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include - -extern void power4_idle(void); - -void default_idle(void) -{ - unsigned int cpu = smp_processor_id(); - set_thread_flag(TIF_POLLING_NRFLAG); - - while (1) { - if (!need_resched()) { - while (!need_resched() && !cpu_is_offline(cpu)) { - ppc64_runlatch_off(); - - /* - * Go into low thread priority and possibly - * low power mode. - */ - HMT_low(); - HMT_very_low(); - } - - HMT_medium(); - } - - ppc64_runlatch_on(); - preempt_enable_no_resched(); - schedule(); - preempt_disable(); - if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING) - cpu_die(); - } -} - -void native_idle(void) -{ - while (1) { - ppc64_runlatch_off(); - - if (!need_resched()) - power4_idle(); - - if (need_resched()) { - ppc64_runlatch_on(); - preempt_enable_no_resched(); - schedule(); - preempt_disable(); - } - - if (cpu_is_offline(smp_processor_id()) && - system_state == SYSTEM_RUNNING) - cpu_die(); - } -} - -void cpu_idle(void) -{ - BUG_ON(NULL == ppc_md.idle_loop); - ppc_md.idle_loop(); -} - -int powersave_nap; - -#ifdef CONFIG_SYSCTL -/* - * Register the sysctl to set/clear powersave_nap. - */ -static ctl_table powersave_nap_ctl_table[]={ - { - .ctl_name = KERN_PPC_POWERSAVE_NAP, - .procname = "powersave-nap", - .data = &powersave_nap, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = &proc_dointvec, - }, - { 0, }, -}; -static ctl_table powersave_nap_sysctl_root[] = { - { 1, "kernel", NULL, 0, 0755, powersave_nap_ctl_table, }, - { 0,}, -}; - -static int __init -register_powersave_nap_sysctl(void) -{ - register_sysctl_table(powersave_nap_sysctl_root, 0); - - return 0; -} -__initcall(register_powersave_nap_sysctl); -#endif diff --git a/arch/ppc64/kernel/nvram.c b/arch/ppc64/kernel/nvram.c deleted file mode 100644 index c0fcd29918c..00000000000 --- a/arch/ppc64/kernel/nvram.c +++ /dev/null @@ -1,742 +0,0 @@ -/* - * c 2001 PPC 64 Team, IBM Corp - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - * /dev/nvram driver for PPC64 - * - * This perhaps should live in drivers/char - * - * TODO: Split the /dev/nvram part (that one can use - * drivers/char/generic_nvram.c) from the arch & partition - * parsing code. - */ - -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#undef DEBUG_NVRAM - -static int nvram_scan_partitions(void); -static int nvram_setup_partition(void); -static int nvram_create_os_partition(void); -static int nvram_remove_os_partition(void); - -static struct nvram_partition * nvram_part; -static long nvram_error_log_index = -1; -static long nvram_error_log_size = 0; - -int no_logging = 1; /* Until we initialize everything, - * make sure we don't try logging - * anything */ - -extern volatile int error_log_cnt; - -struct err_log_info { - int error_type; - unsigned int seq_num; -}; - -static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin) -{ - int size; - - if (ppc_md.nvram_size == NULL) - return -ENODEV; - size = ppc_md.nvram_size(); - - switch (origin) { - case 1: - offset += file->f_pos; - break; - case 2: - offset += size; - break; - } - if (offset < 0) - return -EINVAL; - file->f_pos = offset; - return file->f_pos; -} - - -static ssize_t dev_nvram_read(struct file *file, char __user *buf, - size_t count, loff_t *ppos) -{ - ssize_t len; - char *tmp_buffer; - int size; - - if (ppc_md.nvram_size == NULL) - return -ENODEV; - size = ppc_md.nvram_size(); - - if (!access_ok(VERIFY_WRITE, buf, count)) - return -EFAULT; - if (*ppos >= size) - return 0; - if (count > size) - count = size; - - tmp_buffer = (char *) kmalloc(count, GFP_KERNEL); - if (!tmp_buffer) { - printk(KERN_ERR "dev_read_nvram: kmalloc failed\n"); - return -ENOMEM; - } - - len = ppc_md.nvram_read(tmp_buffer, count, ppos); - if ((long)len <= 0) { - kfree(tmp_buffer); - return len; - } - - if (copy_to_user(buf, tmp_buffer, len)) { - kfree(tmp_buffer); - return -EFAULT; - } - - kfree(tmp_buffer); - return len; - -} - -static ssize_t dev_nvram_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - ssize_t len; - char * tmp_buffer; - int size; - - if (ppc_md.nvram_size == NULL) - return -ENODEV; - size = ppc_md.nvram_size(); - - if (!access_ok(VERIFY_READ, buf, count)) - return -EFAULT; - if (*ppos >= size) - return 0; - if (count > size) - count = size; - - tmp_buffer = (char *) kmalloc(count, GFP_KERNEL); - if (!tmp_buffer) { - printk(KERN_ERR "dev_nvram_write: kmalloc failed\n"); - return -ENOMEM; - } - - if (copy_from_user(tmp_buffer, buf, count)) { - kfree(tmp_buffer); - return -EFAULT; - } - - len = ppc_md.nvram_write(tmp_buffer, count, ppos); - if ((long)len <= 0) { - kfree(tmp_buffer); - return len; - } - - kfree(tmp_buffer); - return len; -} - -static int dev_nvram_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - switch(cmd) { -#ifdef CONFIG_PPC_PMAC - case OBSOLETE_PMAC_NVRAM_GET_OFFSET: - printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n"); - case IOC_NVRAM_GET_OFFSET: { - int part, offset; - - if (_machine != PLATFORM_POWERMAC) - return -EINVAL; - if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0) - return -EFAULT; - if (part < pmac_nvram_OF || part > pmac_nvram_NR) - return -EINVAL; - offset = pmac_get_partition(part); - if (offset < 0) - return offset; - if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0) - return -EFAULT; - return 0; - } -#endif /* CONFIG_PPC_PMAC */ - } - return -EINVAL; -} - -struct file_operations nvram_fops = { - .owner = THIS_MODULE, - .llseek = dev_nvram_llseek, - .read = dev_nvram_read, - .write = dev_nvram_write, - .ioctl = dev_nvram_ioctl, -}; - -static struct miscdevice nvram_dev = { - NVRAM_MINOR, - "nvram", - &nvram_fops -}; - - -#ifdef DEBUG_NVRAM -static void nvram_print_partitions(char * label) -{ - struct list_head * p; - struct nvram_partition * tmp_part; - - printk(KERN_WARNING "--------%s---------\n", label); - printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n"); - list_for_each(p, &nvram_part->partition) { - tmp_part = list_entry(p, struct nvram_partition, partition); - printk(KERN_WARNING "%d \t%02x\t%02x\t%d\t%s\n", - tmp_part->index, tmp_part->header.signature, - tmp_part->header.checksum, tmp_part->header.length, - tmp_part->header.name); - } -} -#endif - - -static int nvram_write_header(struct nvram_partition * part) -{ - loff_t tmp_index; - int rc; - - tmp_index = part->index; - rc = ppc_md.nvram_write((char *)&part->header, NVRAM_HEADER_LEN, &tmp_index); - - return rc; -} - - -static unsigned char nvram_checksum(struct nvram_header *p) -{ - unsigned int c_sum, c_sum2; - unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */ - c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5]; - - /* The sum may have spilled into the 3rd byte. Fold it back. */ - c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff; - /* The sum cannot exceed 2 bytes. Fold it into a checksum */ - c_sum2 = (c_sum >> 8) + (c_sum << 8); - c_sum = ((c_sum + c_sum2) >> 8) & 0xff; - return c_sum; -} - - -/* - * Find an nvram partition, sig can be 0 for any - * partition or name can be NULL for any name, else - * tries to match both - */ -struct nvram_partition *nvram_find_partition(int sig, const char *name) -{ - struct nvram_partition * part; - struct list_head * p; - - list_for_each(p, &nvram_part->partition) { - part = list_entry(p, struct nvram_partition, partition); - - if (sig && part->header.signature != sig) - continue; - if (name && 0 != strncmp(name, part->header.name, 12)) - continue; - return part; - } - return NULL; -} -EXPORT_SYMBOL(nvram_find_partition); - - -static int nvram_remove_os_partition(void) -{ - struct list_head *i; - struct list_head *j; - struct nvram_partition * part; - struct nvram_partition * cur_part; - int rc; - - list_for_each(i, &nvram_part->partition) { - part = list_entry(i, struct nvram_partition, partition); - if (part->header.signature != NVRAM_SIG_OS) - continue; - - /* Make os 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); - return rc; - } - - } - - return 0; -} - -/* nvram_create_os_partition - * - * 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. - */ -static int nvram_create_os_partition(void) -{ - struct nvram_partition *part; - struct nvram_partition *new_part; - struct nvram_partition *free_part = NULL; - int seq_init[2] = { 0, 0 }; - loff_t tmp_index; - long size = 0; - int rc; - - /* 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; - free_part = part; - break; - } - if (!size && part->header.length >= NVRAM_MIN_REQ) { - size = NVRAM_MIN_REQ; - free_part = part; - } - } - if (!size) - return -ENOSPC; - - /* 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"); - return -ENOMEM; - } - - new_part->index = free_part->index; - new_part->header.signature = NVRAM_SIG_OS; - new_part->header.length = size; - strcpy(new_part->header.name, "ppc64,linux"); - 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 " - "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) { - 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; - } - - return 0; -} - - -/* nvram_setup_partition - * - * This will setup the partition we need for buffering the - * error logs and cleanup partitions if needed. - * - * The general strategy is the following: - * 1.) If there is ppc64,linux partition large enough then use it. - * 2.) If there is not a ppc64,linux partition large enough, search - * for a free partition that is large enough. - * 3.) If there is not a free partition large enough remove - * _all_ OS partitions and consolidate the space. - * 4.) Will first try getting a chunk that will satisfy the maximum - * error log size (NVRAM_MAX_REQ). - * 5.) If the max chunk cannot be allocated then try finding a chunk - * that will satisfy the minum needed (NVRAM_MIN_REQ). - */ -static int nvram_setup_partition(void) -{ - struct list_head * p; - struct nvram_partition * part; - int rc; - - /* For now, we don't do any of this on pmac, until I - * have figured out if it's worth killing some unused stuffs - * in our nvram, as Apple defined partitions use pretty much - * all of the space - */ - if (_machine == PLATFORM_POWERMAC) - return -ENOSPC; - - /* see if we have an OS partition that meets our needs. - will try getting the max we need. If not we'll delete - partitions and try again. */ - list_for_each(p, &nvram_part->partition) { - part = list_entry(p, struct nvram_partition, partition); - if (part->header.signature != NVRAM_SIG_OS) - continue; - - if (strcmp(part->header.name, "ppc64,linux")) - continue; - - if (part->header.length >= 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; - } - } - - /* 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; - } - - /* 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; - } - - return 0; -} - - -static int nvram_scan_partitions(void) -{ - loff_t cur_index = 0; - struct nvram_header phead; - struct nvram_partition * tmp_part; - unsigned char c_sum; - char * header; - int total_size; - int err; - - if (ppc_md.nvram_size == NULL) - return -ENODEV; - total_size = ppc_md.nvram_size(); - - header = (char *) kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL); - if (!header) { - printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n"); - return -ENOMEM; - } - - while (cur_index < total_size) { - - err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index); - if (err != NVRAM_HEADER_LEN) { - printk(KERN_ERR "nvram_scan_partitions: Error parsing " - "nvram partitions\n"); - goto out; - } - - cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */ - - memcpy(&phead, header, NVRAM_HEADER_LEN); - - err = 0; - c_sum = nvram_checksum(&phead); - if (c_sum != phead.checksum) { - printk(KERN_WARNING "WARNING: nvram partition checksum" - " was %02x, should be %02x!\n", - phead.checksum, c_sum); - printk(KERN_WARNING "Terminating nvram partition scan\n"); - goto out; - } - if (!phead.length) { - printk(KERN_WARNING "WARNING: nvram corruption " - "detected: 0-length partition\n"); - goto out; - } - tmp_part = (struct nvram_partition *) - kmalloc(sizeof(struct nvram_partition), GFP_KERNEL); - err = -ENOMEM; - if (!tmp_part) { - printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n"); - goto out; - } - - memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN); - tmp_part->index = cur_index; - list_add_tail(&tmp_part->partition, &nvram_part->partition); - - cur_index += phead.length * NVRAM_BLOCK_LEN; - } - err = 0; - - out: - kfree(header); - return err; -} - -static int __init nvram_init(void) -{ - int error; - int rc; - - if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) - return -ENODEV; - - rc = misc_register(&nvram_dev); - if (rc != 0) { - printk(KERN_ERR "nvram_init: failed to register device\n"); - return rc; - } - - /* initialize our anchor for the nvram partition list */ - nvram_part = (struct nvram_partition *) kmalloc(sizeof(struct nvram_partition), GFP_KERNEL); - if (!nvram_part) { - printk(KERN_ERR "nvram_init: Failed kmalloc\n"); - return -ENOMEM; - } - INIT_LIST_HEAD(&nvram_part->partition); - - /* Get all the NVRAM partitions */ - error = nvram_scan_partitions(); - if (error) { - printk(KERN_ERR "nvram_init: Failed nvram_scan_partitions\n"); - return error; - } - - if(nvram_setup_partition()) - printk(KERN_WARNING "nvram_init: Could not find nvram partition" - " for nvram buffered error logging.\n"); - -#ifdef DEBUG_NVRAM - nvram_print_partitions("NVRAM Partitions"); -#endif - - return rc; -} - -void __exit nvram_cleanup(void) -{ - misc_deregister( &nvram_dev ); -} - - -#ifdef CONFIG_PPC_PSERIES - -/* nvram_write_error_log - * - * We need to buffer the error logs into nvram to ensure that we have - * the failure information to decode. If we have a severe error there - * is no way to guarantee that the OS or the machine is in a state to - * get back to user land and write the error to disk. For example if - * the SCSI device driver causes a Machine Check by writing to a bad - * IO address, there is no way of guaranteeing that the device driver - * is in any state that is would also be able to write the error data - * captured to disk, thus we buffer it in NVRAM for analysis on the - * next boot. - * - * In NVRAM the partition containing the error log buffer will looks like: - * Header (in bytes): - * +-----------+----------+--------+------------+------------------+ - * | signature | checksum | length | name | data | - * |0 |1 |2 3|4 15|16 length-1| - * +-----------+----------+--------+------------+------------------+ - * - * The 'data' section would look like (in bytes): - * +--------------+------------+-----------------------------------+ - * | event_logged | sequence # | error log | - * |0 3|4 7|8 nvram_error_log_size-1| - * +--------------+------------+-----------------------------------+ - * - * event_logged: 0 if event has not been logged to syslog, 1 if it has - * sequence #: The unique sequence # for each event. (until it wraps) - * error log: The error log from event_scan - */ -int nvram_write_error_log(char * buff, int length, unsigned int err_type) -{ - int rc; - loff_t tmp_index; - struct err_log_info info; - - if (no_logging) { - return -EPERM; - } - - if (nvram_error_log_index == -1) { - return -ESPIPE; - } - - if (length > nvram_error_log_size) { - length = nvram_error_log_size; - } - - info.error_type = err_type; - info.seq_num = error_log_cnt; - - tmp_index = nvram_error_log_index; - - rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), &tmp_index); - if (rc <= 0) { - printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc); - return rc; - } - - rc = ppc_md.nvram_write(buff, length, &tmp_index); - if (rc <= 0) { - printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc); - return rc; - } - - return 0; -} - -/* nvram_read_error_log - * - * Reads nvram for error log for at most 'length' - */ -int nvram_read_error_log(char * buff, int length, unsigned int * err_type) -{ - int rc; - loff_t tmp_index; - struct err_log_info info; - - if (nvram_error_log_index == -1) - return -1; - - if (length > nvram_error_log_size) - length = nvram_error_log_size; - - tmp_index = nvram_error_log_index; - - rc = ppc_md.nvram_read((char *)&info, sizeof(struct err_log_info), &tmp_index); - if (rc <= 0) { - printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc); - return rc; - } - - rc = ppc_md.nvram_read(buff, length, &tmp_index); - if (rc <= 0) { - printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc); - return rc; - } - - error_log_cnt = info.seq_num; - *err_type = info.error_type; - - return 0; -} - -/* This doesn't actually zero anything, but it sets the event_logged - * word to tell that this event is safely in syslog. - */ -int nvram_clear_error_log(void) -{ - loff_t tmp_index; - int clear_word = ERR_FLAG_ALREADY_LOGGED; - int rc; - - tmp_index = nvram_error_log_index; - - rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index); - if (rc <= 0) { - printk(KERN_ERR "nvram_clear_error_log: Failed nvram_write (%d)\n", rc); - return rc; - } - - return 0; -} - -#endif /* CONFIG_PPC_PSERIES */ - -module_init(nvram_init); -module_exit(nvram_cleanup); -MODULE_LICENSE("GPL"); -- cgit v1.2.3