Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 657 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/rtas.c b/arch/ppc64/kernel/rtas.c
new file mode 100644
index 000000000000..5575603def27
--- /dev/null
+++ b/arch/ppc64/kernel/rtas.c
@@ -0,0 +1,657 @@
+/*
+ *
+ * Procedures for interfacing to the RTAS on CHRP machines.
+ *
+ * Peter Bergner, IBM   March 2001.
+ * Copyright (C) 2001 IBM.
+ *
+ *      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 <stdarg.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+#include <asm/prom.h>
+#include <asm/rtas.h>
+#include <asm/semaphore.h>
+#include <asm/machdep.h>
+#include <asm/page.h>
+#include <asm/param.h>
+#include <asm/system.h>
+#include <asm/abs_addr.h>
+#include <asm/udbg.h>
+#include <asm/delay.h>
+#include <asm/uaccess.h>
+#include <asm/systemcfg.h>
+
+struct flash_block_list_header rtas_firmware_flash_list = {0, NULL};
+
+struct rtas_t rtas = { 
+        .lock = SPIN_LOCK_UNLOCKED
+};
+
+EXPORT_SYMBOL(rtas);
+
+char rtas_err_buf[RTAS_ERROR_LOG_MAX];
+
+DEFINE_SPINLOCK(rtas_data_buf_lock);
+char rtas_data_buf[RTAS_DATA_BUF_SIZE]__page_aligned;
+unsigned long rtas_rmo_buf;
+
+void
+call_rtas_display_status(unsigned char c)
+{
+        struct rtas_args *args = &rtas.args;
+        unsigned long s;
+
+        if (!rtas.base)
+                return;
+        spin_lock_irqsave(&rtas.lock, s);
+
+        args->token = 10;
+        args->nargs = 1;
+        args->nret  = 1;
+        args->rets  = (rtas_arg_t *)&(args->args[1]);
+        args->args[0] = (int)c;
+
+        enter_rtas(__pa(args));
+
+        spin_unlock_irqrestore(&rtas.lock, s);
+}
+
+void
+call_rtas_display_status_delay(unsigned char c)
+{
+        static int pending_newline = 0;  /* did last write end with unprinted newline? */
+        static int width = 16;
+
+        if (c == '\n') {        
+                while (width-- > 0)
+                        call_rtas_display_status(' ');
+                width = 16;
+                udelay(500000);
+                pending_newline = 1;
+        } else {
+                if (pending_newline) {
+                        call_rtas_display_status('\r');
+                        call_rtas_display_status('\n');
+                } 
+                pending_newline = 0;
+                if (width--) {
+                        call_rtas_display_status(c);
+                        udelay(10000);
+                }
+        }
+}
+
+int
+rtas_token(const char *service)
+{
+        int *tokp;
+        if (rtas.dev == NULL) {
+                PPCDBG(PPCDBG_RTAS,"\tNo rtas device in device-tree...\n");
+                return RTAS_UNKNOWN_SERVICE;
+        }
+        tokp = (int *) get_property(rtas.dev, service, NULL);
+        return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
+}
+
+/*
+ * Return the firmware-specified size of the error log buffer
+ *  for all rtas calls that require an error buffer argument.
+ *  This includes 'check-exception' and 'rtas-last-error'.
+ */
+int rtas_get_error_log_max(void)
+{
+        static int rtas_error_log_max;
+        if (rtas_error_log_max)
+                return rtas_error_log_max;
+
+        rtas_error_log_max = rtas_token ("rtas-error-log-max");
+        if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
+            (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
+                printk (KERN_WARNING "RTAS: bad log buffer size %d\n", rtas_error_log_max);
+                rtas_error_log_max = RTAS_ERROR_LOG_MAX;
+        }
+        return rtas_error_log_max;
+}
+
+
+/** Return a copy of the detailed error text associated with the
+ *  most recent failed call to rtas.  Because the error text
+ *  might go stale if there are any other intervening rtas calls,
+ *  this routine must be called atomically with whatever produced
+ *  the error (i.e. with rtas.lock still held from the previous call).
+ */
+static int
+__fetch_rtas_last_error(void)
+{
+        struct rtas_args err_args, save_args;
+        u32 bufsz;
+
+        bufsz = rtas_get_error_log_max();
+
+        err_args.token = rtas_token("rtas-last-error");
+        err_args.nargs = 2;
+        err_args.nret = 1;
+
+        err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
+        err_args.args[1] = bufsz;
+        err_args.args[2] = 0;
+
+        save_args = rtas.args;
+        rtas.args = err_args;
+
+        enter_rtas(__pa(&rtas.args));
+
+        err_args = rtas.args;
+        rtas.args = save_args;
+
+        return err_args.args[2];
+}
+
+int rtas_call(int token, int nargs, int nret, int *outputs, ...)
+{
+        va_list list;
+        int i, logit = 0;
+        unsigned long s;
+        struct rtas_args *rtas_args;
+        char * buff_copy = NULL;
+        int ret;
+
+        PPCDBG(PPCDBG_RTAS, "Entering rtas_call\n");
+        PPCDBG(PPCDBG_RTAS, "\ttoken    = 0x%x\n", token);
+        PPCDBG(PPCDBG_RTAS, "\tnargs    = %d\n", nargs);
+        PPCDBG(PPCDBG_RTAS, "\tnret     = %d\n", nret);
+        PPCDBG(PPCDBG_RTAS, "\t&outputs = 0x%lx\n", outputs);
+        if (token == RTAS_UNKNOWN_SERVICE)
+                return -1;
+
+        /* Gotta do something different here, use global lock for now... */
+        spin_lock_irqsave(&rtas.lock, s);
+        rtas_args = &rtas.args;
+
+        rtas_args->token = token;
+        rtas_args->nargs = nargs;
+        rtas_args->nret  = nret;
+        rtas_args->rets  = (rtas_arg_t *)&(rtas_args->args[nargs]);
+        va_start(list, outputs);
+        for (i = 0; i < nargs; ++i) {
+                rtas_args->args[i] = va_arg(list, rtas_arg_t);
+                PPCDBG(PPCDBG_RTAS, "\tnarg[%d] = 0x%x\n", i, rtas_args->args[i]);
+        }
+        va_end(list);
+
+        for (i = 0; i < nret; ++i)
+                rtas_args->rets[i] = 0;
+
+        PPCDBG(PPCDBG_RTAS, "\tentering rtas with 0x%lx\n",
+                __pa(rtas_args));
+        enter_rtas(__pa(rtas_args));
+        PPCDBG(PPCDBG_RTAS, "\treturned from rtas ...\n");
+
+        /* A -1 return code indicates that the last command couldn't
+           be completed due to a hardware error. */
+        if (rtas_args->rets[0] == -1)
+                logit = (__fetch_rtas_last_error() == 0);
+
+        ifppcdebug(PPCDBG_RTAS) {
+                for(i=0; i < nret ;i++)
+                        udbg_printf("\tnret[%d] = 0x%lx\n", i, (ulong)rtas_args->rets[i]);
+        }
+
+        if (nret > 1 && outputs != NULL)
+                for (i = 0; i < nret-1; ++i)
+                        outputs[i] = rtas_args->rets[i+1];
+        ret = (nret > 0)? rtas_args->rets[0]: 0;
+
+        /* Log the error in the unlikely case that there was one. */
+        if (unlikely(logit)) {
+                buff_copy = rtas_err_buf;
+                if (mem_init_done) {
+                        buff_copy = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
+                        if (buff_copy)
+                                memcpy(buff_copy, rtas_err_buf,
+                                       RTAS_ERROR_LOG_MAX);
+                }
+        }
+
+        /* Gotta do something different here, use global lock for now... */
+        spin_unlock_irqrestore(&rtas.lock, s);
+
+        if (buff_copy) {
+                log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
+                if (mem_init_done)
+                        kfree(buff_copy);
+        }
+        return ret;
+}
+
+/* Given an RTAS status code of 990n compute the hinted delay of 10^n
+ * (last digit) milliseconds.  For now we bound at n=5 (100 sec).
+ */
+unsigned int
+rtas_extended_busy_delay_time(int status)
+{
+        int order = status - 9900;
+        unsigned long ms;
+
+        if (order < 0)
+                order = 0;      /* RTC depends on this for -2 clock busy */
+        else if (order > 5)
+                order = 5;      /* bound */
+
+        /* Use microseconds for reasonable accuracy */
+        for (ms=1; order > 0; order--)
+                ms *= 10;
+
+        return ms; 
+}
+
+int rtas_error_rc(int rtas_rc)
+{
+        int rc;
+
+        switch (rtas_rc) {
+                case -1:                /* Hardware Error */
+                        rc = -EIO;
+                        break;
+                case -3:                /* Bad indicator/domain/etc */
+                        rc = -EINVAL;
+                        break;
+                case -9000:             /* Isolation error */
+                        rc = -EFAULT;
+                        break;
+                case -9001:             /* Outstanding TCE/PTE */
+                        rc = -EEXIST;
+                        break;
+                case -9002:             /* No usable slot */
+                        rc = -ENODEV;
+                        break;
+                default:
+                        printk(KERN_ERR "%s: unexpected RTAS error %d\n",
+                                        __FUNCTION__, rtas_rc);
+                        rc = -ERANGE;
+                        break;
+        }
+        return rc;
+}
+
+int rtas_get_power_level(int powerdomain, int *level)
+{
+        int token = rtas_token("get-power-level");
+        int rc;
+
+        if (token == RTAS_UNKNOWN_SERVICE)
+                return -ENOENT;
+
+        while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
+                udelay(1);
+
+        if (rc < 0)
+                return rtas_error_rc(rc);
+        return rc;
+}
+
+int rtas_set_power_level(int powerdomain, int level, int *setlevel)
+{
+        int token = rtas_token("set-power-level");
+        unsigned int wait_time;
+        int rc;
+
+        if (token == RTAS_UNKNOWN_SERVICE)
+                return -ENOENT;
+
+        while (1) {
+                rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
+                if (rc == RTAS_BUSY)
+                        udelay(1);
+                else if (rtas_is_extended_busy(rc)) {
+                        wait_time = rtas_extended_busy_delay_time(rc);
+                        udelay(wait_time * 1000);
+                } else
+                        break;
+        }
+
+        if (rc < 0)
+                return rtas_error_rc(rc);
+        return rc;
+}
+
+int rtas_get_sensor(int sensor, int index, int *state)
+{
+        int token = rtas_token("get-sensor-state");
+        unsigned int wait_time;
+        int rc;
+
+        if (token == RTAS_UNKNOWN_SERVICE)
+                return -ENOENT;
+
+        while (1) {
+                rc = rtas_call(token, 2, 2, state, sensor, index);
+                if (rc == RTAS_BUSY)
+                        udelay(1);
+                else if (rtas_is_extended_busy(rc)) {
+                        wait_time = rtas_extended_busy_delay_time(rc);
+                        udelay(wait_time * 1000);
+                } else
+                        break;
+        }
+
+        if (rc < 0)
+                return rtas_error_rc(rc);
+        return rc;
+}
+
+int rtas_set_indicator(int indicator, int index, int new_value)
+{
+        int token = rtas_token("set-indicator");
+        unsigned int wait_time;
+        int rc;
+
+        if (token == RTAS_UNKNOWN_SERVICE)
+                return -ENOENT;
+
+        while (1) {
+                rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
+                if (rc == RTAS_BUSY)
+                        udelay(1);
+                else if (rtas_is_extended_busy(rc)) {
+                        wait_time = rtas_extended_busy_delay_time(rc);
+                        udelay(wait_time * 1000);
+                }
+                else
+                        break;
+        }
+
+        if (rc < 0)
+                return rtas_error_rc(rc);
+        return rc;
+}
+
+#define FLASH_BLOCK_LIST_VERSION (1UL)
+static void
+rtas_flash_firmware(void)
+{
+        unsigned long image_size;
+        struct flash_block_list *f, *next, *flist;
+        unsigned long rtas_block_list;
+        int i, status, update_token;
+
+        update_token = rtas_token("ibm,update-flash-64-and-reboot");
+        if (update_token == RTAS_UNKNOWN_SERVICE) {
+                printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot is not available -- not a service partition?\n");
+                printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
+                return;
+        }
+
+        /* NOTE: the "first" block list is a global var with no data
+         * blocks in the kernel data segment.  We do this because
+         * we want to ensure this block_list addr is under 4GB.
+         */
+        rtas_firmware_flash_list.num_blocks = 0;
+        flist = (struct flash_block_list *)&rtas_firmware_flash_list;
+        rtas_block_list = virt_to_abs(flist);
+        if (rtas_block_list >= 4UL*1024*1024*1024) {
+                printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
+                return;
+        }
+
+        printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
+        /* Update the block_list in place. */
+        image_size = 0;
+        for (f = flist; f; f = next) {
+                /* Translate data addrs to absolute */
+                for (i = 0; i < f->num_blocks; i++) {
+                        f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data);
+                        image_size += f->blocks[i].length;
+                }
+                next = f->next;
+                /* Don't translate NULL pointer for last entry */
+                if (f->next)
+                        f->next = (struct flash_block_list *)virt_to_abs(f->next);
+                else
+                        f->next = NULL;
+                /* make num_blocks into the version/length field */
+                f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
+        }
+
+        printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
+        printk(KERN_ALERT "FLASH: performing flash and reboot\n");
+        ppc_md.progress("Flashing        \n", 0x0);
+        ppc_md.progress("Please Wait...  ", 0x0);
+        printk(KERN_ALERT "FLASH: this will take several minutes.  Do not power off!\n");
+        status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
+        switch (status) {       /* should only get "bad" status */
+            case 0:
+                printk(KERN_ALERT "FLASH: success\n");
+                break;
+            case -1:
+                printk(KERN_ALERT "FLASH: hardware error.  Firmware may not be not flashed\n");
+                break;
+            case -3:
+                printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform.  Firmware not flashed\n");
+                break;
+            case -4:
+                printk(KERN_ALERT "FLASH: flash failed when partially complete.  System may not reboot\n");
+                break;
+            default:
+                printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
+                break;
+        }
+}
+
+void rtas_flash_bypass_warning(void)
+{
+        printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
+        printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
+}
+
+
+void
+rtas_restart(char *cmd)
+{
+        if (rtas_firmware_flash_list.next)
+                rtas_flash_firmware();
+
+        printk("RTAS system-reboot returned %d\n",
+               rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
+        for (;;);
+}
+
+void
+rtas_power_off(void)
+{
+        if (rtas_firmware_flash_list.next)
+                rtas_flash_bypass_warning();
+        /* allow power on only with power button press */
+        printk("RTAS power-off returned %d\n",
+               rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
+        for (;;);
+}
+
+void
+rtas_halt(void)
+{
+        if (rtas_firmware_flash_list.next)
+                rtas_flash_bypass_warning();
+        rtas_power_off();
+}
+
+/* Must be in the RMO region, so we place it here */
+static char rtas_os_term_buf[2048];
+
+void rtas_os_term(char *str)
+{
+        int status;
+
+        if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term"))
+                return;
+
+        snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
+
+        do {
+                status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
+                                   __pa(rtas_os_term_buf));
+
+                if (status == RTAS_BUSY)
+                        udelay(1);
+                else if (status != 0)
+                        printk(KERN_EMERG "ibm,os-term call failed %d\n",
+                               status);
+        } while (status == RTAS_BUSY);
+}
+
+
+asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
+{
+        struct rtas_args args;
+        unsigned long flags;
+        char * buff_copy;
+        int nargs;
+        int err_rc = 0;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
+                return -EFAULT;
+
+        nargs = args.nargs;
+        if (nargs > ARRAY_SIZE(args.args)
+            || args.nret > ARRAY_SIZE(args.args)
+            || nargs + args.nret > ARRAY_SIZE(args.args))
+                return -EINVAL;
+
+        /* Copy in args. */
+        if (copy_from_user(args.args, uargs->args,
+                           nargs * sizeof(rtas_arg_t)) != 0)
+                return -EFAULT;
+
+        buff_copy = kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL);
+
+        spin_lock_irqsave(&rtas.lock, flags);
+
+        rtas.args = args;
+        enter_rtas(__pa(&rtas.args));
+        args = rtas.args;
+
+        args.rets = &args.args[nargs];
+
+        /* A -1 return code indicates that the last command couldn't
+           be completed due to a hardware error. */
+        if (args.rets[0] == -1) {
+                err_rc = __fetch_rtas_last_error();
+                if ((err_rc == 0) && buff_copy) {
+                        memcpy(buff_copy, rtas_err_buf, RTAS_ERROR_LOG_MAX);
+                }
+        }
+
+        spin_unlock_irqrestore(&rtas.lock, flags);
+
+        if (buff_copy) {
+                if ((args.rets[0] == -1) && (err_rc == 0)) {
+                        log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
+                }
+                kfree(buff_copy);
+        }
+
+        /* Copy out args. */
+        if (copy_to_user(uargs->args + nargs,
+                         args.args + nargs,
+                         args.nret * sizeof(rtas_arg_t)) != 0)
+                return -EFAULT;
+
+        return 0;
+}
+
+/* This version can't take the spinlock, because it never returns */
+
+struct rtas_args rtas_stop_self_args = {
+        /* The token is initialized for real in setup_system() */
+        .token = RTAS_UNKNOWN_SERVICE,
+        .nargs = 0,
+        .nret = 1,
+        .rets = &rtas_stop_self_args.args[0],
+};
+
+void rtas_stop_self(void)
+{
+        struct rtas_args *rtas_args = &rtas_stop_self_args;
+
+        local_irq_disable();
+
+        BUG_ON(rtas_args->token == RTAS_UNKNOWN_SERVICE);
+
+        printk("cpu %u (hwid %u) Ready to die...\n",
+               smp_processor_id(), hard_smp_processor_id());
+        enter_rtas(__pa(rtas_args));
+
+        panic("Alas, I survived.\n");
+}
+
+/*
+ * Call early during boot, before mem init or bootmem, to retreive the RTAS
+ * informations from the device-tree and allocate the RMO buffer for userland
+ * accesses.
+ */
+void __init rtas_initialize(void)
+{
+        /* Get RTAS dev node and fill up our "rtas" structure with infos
+         * about it.
+         */
+        rtas.dev = of_find_node_by_name(NULL, "rtas");
+        if (rtas.dev) {
+                u32 *basep, *entryp;
+                u32 *sizep;
+
+                basep = (u32 *)get_property(rtas.dev, "linux,rtas-base", NULL);
+                sizep = (u32 *)get_property(rtas.dev, "rtas-size", NULL);
+                if (basep != NULL && sizep != NULL) {
+                        rtas.base = *basep;
+                        rtas.size = *sizep;
+                        entryp = (u32 *)get_property(rtas.dev, "linux,rtas-entry", NULL);
+                        if (entryp == NULL) /* Ugh */
+                                rtas.entry = rtas.base;
+                        else
+                                rtas.entry = *entryp;
+                } else
+                        rtas.dev = NULL;
+        }
+        /* If RTAS was found, allocate the RMO buffer for it and look for
+         * the stop-self token if any
+         */
+        if (rtas.dev) {
+                unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
+                if (systemcfg->platform == PLATFORM_PSERIES_LPAR)
+                        rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX);
+
+                rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE,
+                                                        rtas_region);
+
+#ifdef CONFIG_HOTPLUG_CPU
+                rtas_stop_self_args.token = rtas_token("stop-self");
+#endif /* CONFIG_HOTPLUG_CPU */
+        }
+
+}
+
+
+EXPORT_SYMBOL(rtas_firmware_flash_list);
+EXPORT_SYMBOL(rtas_token);
+EXPORT_SYMBOL(rtas_call);
+EXPORT_SYMBOL(rtas_data_buf);
+EXPORT_SYMBOL(rtas_data_buf_lock);
+EXPORT_SYMBOL(rtas_extended_busy_delay_time);
+EXPORT_SYMBOL(rtas_get_sensor);
+EXPORT_SYMBOL(rtas_get_power_level);
+EXPORT_SYMBOL(rtas_set_power_level);
+EXPORT_SYMBOL(rtas_set_indicator);
+EXPORT_SYMBOL(rtas_get_error_log_max);