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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/powerpc/platforms/pseries/ras.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/powerpc/platforms/pseries/ras.c')
-rw-r--r--kernel/arch/powerpc/platforms/pseries/ras.c416
1 files changed, 416 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/platforms/pseries/ras.c b/kernel/arch/powerpc/platforms/pseries/ras.c
new file mode 100644
index 000000000..02e4a1745
--- /dev/null
+++ b/kernel/arch/powerpc/platforms/pseries/ras.c
@@ -0,0 +1,416 @@
+/*
+ * Copyright (C) 2001 Dave Engebretsen IBM Corporation
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/fs.h>
+#include <linux/reboot.h>
+
+#include <asm/machdep.h>
+#include <asm/rtas.h>
+#include <asm/firmware.h>
+
+#include "pseries.h"
+
+static unsigned char ras_log_buf[RTAS_ERROR_LOG_MAX];
+static DEFINE_SPINLOCK(ras_log_buf_lock);
+
+static char global_mce_data_buf[RTAS_ERROR_LOG_MAX];
+static DEFINE_PER_CPU(__u64, mce_data_buf);
+
+static int ras_check_exception_token;
+
+#define EPOW_SENSOR_TOKEN 9
+#define EPOW_SENSOR_INDEX 0
+
+static irqreturn_t ras_epow_interrupt(int irq, void *dev_id);
+static irqreturn_t ras_error_interrupt(int irq, void *dev_id);
+
+
+/*
+ * Initialize handlers for the set of interrupts caused by hardware errors
+ * and power system events.
+ */
+static int __init init_ras_IRQ(void)
+{
+ struct device_node *np;
+
+ ras_check_exception_token = rtas_token("check-exception");
+
+ /* Internal Errors */
+ np = of_find_node_by_path("/event-sources/internal-errors");
+ if (np != NULL) {
+ request_event_sources_irqs(np, ras_error_interrupt,
+ "RAS_ERROR");
+ of_node_put(np);
+ }
+
+ /* EPOW Events */
+ np = of_find_node_by_path("/event-sources/epow-events");
+ if (np != NULL) {
+ request_event_sources_irqs(np, ras_epow_interrupt, "RAS_EPOW");
+ of_node_put(np);
+ }
+
+ return 0;
+}
+machine_subsys_initcall(pseries, init_ras_IRQ);
+
+#define EPOW_SHUTDOWN_NORMAL 1
+#define EPOW_SHUTDOWN_ON_UPS 2
+#define EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS 3
+#define EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH 4
+
+static void handle_system_shutdown(char event_modifier)
+{
+ switch (event_modifier) {
+ case EPOW_SHUTDOWN_NORMAL:
+ pr_emerg("Firmware initiated power off");
+ orderly_poweroff(true);
+ break;
+
+ case EPOW_SHUTDOWN_ON_UPS:
+ pr_emerg("Loss of power reported by firmware, system is "
+ "running on UPS/battery");
+ pr_emerg("Check RTAS error log for details");
+ orderly_poweroff(true);
+ break;
+
+ case EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS:
+ pr_emerg("Loss of system critical functions reported by "
+ "firmware");
+ pr_emerg("Check RTAS error log for details");
+ orderly_poweroff(true);
+ break;
+
+ case EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH:
+ pr_emerg("Ambient temperature too high reported by firmware");
+ pr_emerg("Check RTAS error log for details");
+ orderly_poweroff(true);
+ break;
+
+ default:
+ pr_err("Unknown power/cooling shutdown event (modifier %d)",
+ event_modifier);
+ }
+}
+
+struct epow_errorlog {
+ unsigned char sensor_value;
+ unsigned char event_modifier;
+ unsigned char extended_modifier;
+ unsigned char reserved;
+ unsigned char platform_reason;
+};
+
+#define EPOW_RESET 0
+#define EPOW_WARN_COOLING 1
+#define EPOW_WARN_POWER 2
+#define EPOW_SYSTEM_SHUTDOWN 3
+#define EPOW_SYSTEM_HALT 4
+#define EPOW_MAIN_ENCLOSURE 5
+#define EPOW_POWER_OFF 7
+
+static void rtas_parse_epow_errlog(struct rtas_error_log *log)
+{
+ struct pseries_errorlog *pseries_log;
+ struct epow_errorlog *epow_log;
+ char action_code;
+ char modifier;
+
+ pseries_log = get_pseries_errorlog(log, PSERIES_ELOG_SECT_ID_EPOW);
+ if (pseries_log == NULL)
+ return;
+
+ epow_log = (struct epow_errorlog *)pseries_log->data;
+ action_code = epow_log->sensor_value & 0xF; /* bottom 4 bits */
+ modifier = epow_log->event_modifier & 0xF; /* bottom 4 bits */
+
+ switch (action_code) {
+ case EPOW_RESET:
+ pr_err("Non critical power or cooling issue cleared");
+ break;
+
+ case EPOW_WARN_COOLING:
+ pr_err("Non critical cooling issue reported by firmware");
+ pr_err("Check RTAS error log for details");
+ break;
+
+ case EPOW_WARN_POWER:
+ pr_err("Non critical power issue reported by firmware");
+ pr_err("Check RTAS error log for details");
+ break;
+
+ case EPOW_SYSTEM_SHUTDOWN:
+ handle_system_shutdown(epow_log->event_modifier);
+ break;
+
+ case EPOW_SYSTEM_HALT:
+ pr_emerg("Firmware initiated power off");
+ orderly_poweroff(true);
+ break;
+
+ case EPOW_MAIN_ENCLOSURE:
+ case EPOW_POWER_OFF:
+ pr_emerg("Critical power/cooling issue reported by firmware");
+ pr_emerg("Check RTAS error log for details");
+ pr_emerg("Immediate power off");
+ emergency_sync();
+ kernel_power_off();
+ break;
+
+ default:
+ pr_err("Unknown power/cooling event (action code %d)",
+ action_code);
+ }
+}
+
+/* Handle environmental and power warning (EPOW) interrupts. */
+static irqreturn_t ras_epow_interrupt(int irq, void *dev_id)
+{
+ int status;
+ int state;
+ int critical;
+
+ status = rtas_get_sensor(EPOW_SENSOR_TOKEN, EPOW_SENSOR_INDEX, &state);
+
+ if (state > 3)
+ critical = 1; /* Time Critical */
+ else
+ critical = 0;
+
+ spin_lock(&ras_log_buf_lock);
+
+ status = rtas_call(ras_check_exception_token, 6, 1, NULL,
+ RTAS_VECTOR_EXTERNAL_INTERRUPT,
+ virq_to_hw(irq),
+ RTAS_EPOW_WARNING,
+ critical, __pa(&ras_log_buf),
+ rtas_get_error_log_max());
+
+ log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, 0);
+
+ rtas_parse_epow_errlog((struct rtas_error_log *)ras_log_buf);
+
+ spin_unlock(&ras_log_buf_lock);
+ return IRQ_HANDLED;
+}
+
+/*
+ * Handle hardware error interrupts.
+ *
+ * RTAS check-exception is called to collect data on the exception. If
+ * the error is deemed recoverable, we log a warning and return.
+ * For nonrecoverable errors, an error is logged and we stop all processing
+ * as quickly as possible in order to prevent propagation of the failure.
+ */
+static irqreturn_t ras_error_interrupt(int irq, void *dev_id)
+{
+ struct rtas_error_log *rtas_elog;
+ int status;
+ int fatal;
+
+ spin_lock(&ras_log_buf_lock);
+
+ status = rtas_call(ras_check_exception_token, 6, 1, NULL,
+ RTAS_VECTOR_EXTERNAL_INTERRUPT,
+ virq_to_hw(irq),
+ RTAS_INTERNAL_ERROR, 1 /* Time Critical */,
+ __pa(&ras_log_buf),
+ rtas_get_error_log_max());
+
+ rtas_elog = (struct rtas_error_log *)ras_log_buf;
+
+ if (status == 0 &&
+ rtas_error_severity(rtas_elog) >= RTAS_SEVERITY_ERROR_SYNC)
+ fatal = 1;
+ else
+ fatal = 0;
+
+ /* format and print the extended information */
+ log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, fatal);
+
+ if (fatal) {
+ pr_emerg("Fatal hardware error reported by firmware");
+ pr_emerg("Check RTAS error log for details");
+ pr_emerg("Immediate power off");
+ emergency_sync();
+ kernel_power_off();
+ } else {
+ pr_err("Recoverable hardware error reported by firmware");
+ }
+
+ spin_unlock(&ras_log_buf_lock);
+ return IRQ_HANDLED;
+}
+
+/*
+ * Some versions of FWNMI place the buffer inside the 4kB page starting at
+ * 0x7000. Other versions place it inside the rtas buffer. We check both.
+ */
+#define VALID_FWNMI_BUFFER(A) \
+ ((((A) >= 0x7000) && ((A) < 0x7ff0)) || \
+ (((A) >= rtas.base) && ((A) < (rtas.base + rtas.size - 16))))
+
+/*
+ * Get the error information for errors coming through the
+ * FWNMI vectors. The pt_regs' r3 will be updated to reflect
+ * the actual r3 if possible, and a ptr to the error log entry
+ * will be returned if found.
+ *
+ * If the RTAS error is not of the extended type, then we put it in a per
+ * cpu 64bit buffer. If it is the extended type we use global_mce_data_buf.
+ *
+ * The global_mce_data_buf does not have any locks or protection around it,
+ * if a second machine check comes in, or a system reset is done
+ * before we have logged the error, then we will get corruption in the
+ * error log. This is preferable over holding off on calling
+ * ibm,nmi-interlock which would result in us checkstopping if a
+ * second machine check did come in.
+ */
+static struct rtas_error_log *fwnmi_get_errinfo(struct pt_regs *regs)
+{
+ unsigned long *savep;
+ struct rtas_error_log *h, *errhdr = NULL;
+
+ /* Mask top two bits */
+ regs->gpr[3] &= ~(0x3UL << 62);
+
+ if (!VALID_FWNMI_BUFFER(regs->gpr[3])) {
+ printk(KERN_ERR "FWNMI: corrupt r3 0x%016lx\n", regs->gpr[3]);
+ return NULL;
+ }
+
+ savep = __va(regs->gpr[3]);
+ regs->gpr[3] = savep[0]; /* restore original r3 */
+
+ /* If it isn't an extended log we can use the per cpu 64bit buffer */
+ h = (struct rtas_error_log *)&savep[1];
+ if (!rtas_error_extended(h)) {
+ memcpy(this_cpu_ptr(&mce_data_buf), h, sizeof(__u64));
+ errhdr = (struct rtas_error_log *)this_cpu_ptr(&mce_data_buf);
+ } else {
+ int len, error_log_length;
+
+ error_log_length = 8 + rtas_error_extended_log_length(h);
+ len = max_t(int, error_log_length, RTAS_ERROR_LOG_MAX);
+ memset(global_mce_data_buf, 0, RTAS_ERROR_LOG_MAX);
+ memcpy(global_mce_data_buf, h, len);
+ errhdr = (struct rtas_error_log *)global_mce_data_buf;
+ }
+
+ return errhdr;
+}
+
+/* Call this when done with the data returned by FWNMI_get_errinfo.
+ * It will release the saved data area for other CPUs in the
+ * partition to receive FWNMI errors.
+ */
+static void fwnmi_release_errinfo(void)
+{
+ int ret = rtas_call(rtas_token("ibm,nmi-interlock"), 0, 1, NULL);
+ if (ret != 0)
+ printk(KERN_ERR "FWNMI: nmi-interlock failed: %d\n", ret);
+}
+
+int pSeries_system_reset_exception(struct pt_regs *regs)
+{
+ if (fwnmi_active) {
+ struct rtas_error_log *errhdr = fwnmi_get_errinfo(regs);
+ if (errhdr) {
+ /* XXX Should look at FWNMI information */
+ }
+ fwnmi_release_errinfo();
+ }
+ return 0; /* need to perform reset */
+}
+
+/*
+ * See if we can recover from a machine check exception.
+ * This is only called on power4 (or above) and only via
+ * the Firmware Non-Maskable Interrupts (fwnmi) handler
+ * which provides the error analysis for us.
+ *
+ * Return 1 if corrected (or delivered a signal).
+ * Return 0 if there is nothing we can do.
+ */
+static int recover_mce(struct pt_regs *regs, struct rtas_error_log *err)
+{
+ int recovered = 0;
+ int disposition = rtas_error_disposition(err);
+
+ if (!(regs->msr & MSR_RI)) {
+ /* If MSR_RI isn't set, we cannot recover */
+ recovered = 0;
+
+ } else if (disposition == RTAS_DISP_FULLY_RECOVERED) {
+ /* Platform corrected itself */
+ recovered = 1;
+
+ } else if (disposition == RTAS_DISP_LIMITED_RECOVERY) {
+ /* Platform corrected itself but could be degraded */
+ printk(KERN_ERR "MCE: limited recovery, system may "
+ "be degraded\n");
+ recovered = 1;
+
+ } else if (user_mode(regs) && !is_global_init(current) &&
+ rtas_error_severity(err) == RTAS_SEVERITY_ERROR_SYNC) {
+
+ /*
+ * If we received a synchronous error when in userspace
+ * kill the task. Firmware may report details of the fail
+ * asynchronously, so we can't rely on the target and type
+ * fields being valid here.
+ */
+ printk(KERN_ERR "MCE: uncorrectable error, killing task "
+ "%s:%d\n", current->comm, current->pid);
+
+ _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
+ recovered = 1;
+ }
+
+ log_error((char *)err, ERR_TYPE_RTAS_LOG, 0);
+
+ return recovered;
+}
+
+/*
+ * Handle a machine check.
+ *
+ * Note that on Power 4 and beyond Firmware Non-Maskable Interrupts (fwnmi)
+ * should be present. If so the handler which called us tells us if the
+ * error was recovered (never true if RI=0).
+ *
+ * On hardware prior to Power 4 these exceptions were asynchronous which
+ * means we can't tell exactly where it occurred and so we can't recover.
+ */
+int pSeries_machine_check_exception(struct pt_regs *regs)
+{
+ struct rtas_error_log *errp;
+
+ if (fwnmi_active) {
+ errp = fwnmi_get_errinfo(regs);
+ fwnmi_release_errinfo();
+ if (errp && recover_mce(regs, errp))
+ return 1;
+ }
+
+ return 0;
+}