From ae65a391caf1830aea9e4cadd69bb1aa69aad492 Mon Sep 17 00:00:00 2001 From: linas Date: Thu, 3 Nov 2005 18:42:26 -0600 Subject: [PATCH] ppc64: uniform usage of bus unit id interfaces 01-pci-dn-uniformization.patch This patch changes the rtas_pci interface to use the new struct pci_dn structure for two routines that work with pci device nodes. This patch also does some minor janitorial work: it uses some handy macros and cleans up some trailing whitespace in the affected file. Signed-off-by: Linas Vepstas Signed-off-by: Paul Mackerras --- arch/ppc64/kernel/eeh.c | 4 ---- 1 file changed, 4 deletions(-) (limited to 'arch/ppc64/kernel/eeh.c') diff --git a/arch/ppc64/kernel/eeh.c b/arch/ppc64/kernel/eeh.c index 035d1b14a20..eedf21d5f3b 100644 --- a/arch/ppc64/kernel/eeh.c +++ b/arch/ppc64/kernel/eeh.c @@ -71,10 +71,6 @@ * and sent out for processing. */ -/** Bus Unit ID macros; get low and hi 32-bits of the 64-bit BUID */ -#define BUID_HI(buid) ((buid) >> 32) -#define BUID_LO(buid) ((buid) & 0xffffffff) - /* EEH event workqueue setup. */ static DEFINE_SPINLOCK(eeh_eventlist_lock); LIST_HEAD(eeh_eventlist); -- cgit v1.2.3 From 693765021460f19c5d7c638eb76e2efe1cd84752 Mon Sep 17 00:00:00 2001 From: Linas Vepstas Date: Thu, 3 Nov 2005 18:47:50 -0600 Subject: [PATCH] ppc64: misc minor cleanup 02-eeh-minor-cleanup.patch This patch performs some minor cleanup of the eeh.c file, including: -- trim some trailing whitespace -- remove extraneous #includes -- use the macro PCI_DN uniformly, instead of the void pointer chase. -- typos in comments -- improved debug printk's Signed-off-by: Linas Vepstas Signed-off-by: Paul Mackerras --- arch/ppc64/kernel/eeh.c | 53 +++++++++++++++++++++++-------------------------- 1 file changed, 25 insertions(+), 28 deletions(-) (limited to 'arch/ppc64/kernel/eeh.c') diff --git a/arch/ppc64/kernel/eeh.c b/arch/ppc64/kernel/eeh.c index eedf21d5f3b..bb11569d2b4 100644 --- a/arch/ppc64/kernel/eeh.c +++ b/arch/ppc64/kernel/eeh.c @@ -1,32 +1,31 @@ /* * eeh.c * Copyright (C) 2001 Dave Engebretsen & Todd Inglett 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 #include #include -#include #include #include #include #include #include #include +#include #include #include #include @@ -49,8 +48,8 @@ * were "empty": all reads return 0xff's and all writes are silently * ignored. EEH slot isolation events can be triggered by parity * errors on the address or data busses (e.g. during posted writes), - * which in turn might be caused by dust, vibration, humidity, - * radioactivity or plain-old failed hardware. + * which in turn might be caused by low voltage on the bus, dust, + * vibration, humidity, radioactivity or plain-old failed hardware. * * Note, however, that one of the leading causes of EEH slot * freeze events are buggy device drivers, buggy device microcode, @@ -256,18 +255,17 @@ static void __pci_addr_cache_insert_device(struct pci_dev *dev) dn = pci_device_to_OF_node(dev); if (!dn) { - printk(KERN_WARNING "PCI: no pci dn found for dev=%s\n", - pci_name(dev)); + printk(KERN_WARNING "PCI: no pci dn found for dev=%s\n", pci_name(dev)); return; } /* Skip any devices for which EEH is not enabled. */ - pdn = dn->data; + pdn = PCI_DN(dn); if (!(pdn->eeh_mode & EEH_MODE_SUPPORTED) || pdn->eeh_mode & EEH_MODE_NOCHECK) { #ifdef DEBUG - printk(KERN_INFO "PCI: skip building address cache for=%s\n", - pci_name(dev)); + printk(KERN_INFO "PCI: skip building address cache for=%s - %s\n", + pci_name(dev), pdn->node->full_name); #endif return; } @@ -410,16 +408,16 @@ int eeh_unregister_notifier(struct notifier_block *nb) * @dn: device node to read * @rets: array to return results in */ -static int read_slot_reset_state(struct device_node *dn, int rets[]) +static int read_slot_reset_state(struct pci_dn *pdn, int rets[]) { int token, outputs; - struct pci_dn *pdn = dn->data; if (ibm_read_slot_reset_state2 != RTAS_UNKNOWN_SERVICE) { token = ibm_read_slot_reset_state2; outputs = 4; } else { token = ibm_read_slot_reset_state; + rets[2] = 0; /* fake PE Unavailable info */ outputs = 3; } @@ -496,7 +494,7 @@ static void eeh_event_handler(void *dummy) /** * eeh_token_to_phys - convert EEH address token to phys address - * @token i/o token, should be address in the form 0xE.... + * @token i/o token, should be address in the form 0xA.... */ static inline unsigned long eeh_token_to_phys(unsigned long token) { @@ -522,7 +520,7 @@ static inline unsigned long eeh_token_to_phys(unsigned long token) * will query firmware for the EEH status. * * Returns 0 if there has not been an EEH error; otherwise returns - * a non-zero value and queues up a solt isolation event notification. + * a non-zero value and queues up a slot isolation event notification. * * It is safe to call this routine in an interrupt context. */ @@ -542,7 +540,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) if (!dn) return 0; - pdn = dn->data; + pdn = PCI_DN(dn); /* Access to IO BARs might get this far and still not want checking. */ if (!pdn->eeh_capable || !(pdn->eeh_mode & EEH_MODE_SUPPORTED) || @@ -562,7 +560,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) atomic_inc(&eeh_fail_count); if (atomic_read(&eeh_fail_count) >= EEH_MAX_FAILS) { /* re-read the slot reset state */ - if (read_slot_reset_state(dn, rets) != 0) + if (read_slot_reset_state(pdn, rets) != 0) rets[0] = -1; /* reset state unknown */ eeh_panic(dev, rets[0]); } @@ -576,7 +574,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) * function zero of a multi-function device. * In any case they must share a common PHB. */ - ret = read_slot_reset_state(dn, rets); + ret = read_slot_reset_state(pdn, rets); if (!(ret == 0 && rets[1] == 1 && (rets[0] == 2 || rets[0] == 4))) { __get_cpu_var(false_positives)++; return 0; @@ -635,7 +633,6 @@ EXPORT_SYMBOL(eeh_dn_check_failure); * @token i/o token, should be address in the form 0xA.... * @val value, should be all 1's (XXX why do we need this arg??) * - * Check for an eeh failure at the given token address. * Check for an EEH failure at the given token address. Call this * routine if the result of a read was all 0xff's and you want to * find out if this is due to an EEH slot freeze event. This routine @@ -680,7 +677,7 @@ static void *early_enable_eeh(struct device_node *dn, void *data) u32 *device_id = (u32 *)get_property(dn, "device-id", NULL); u32 *regs; int enable; - struct pci_dn *pdn = dn->data; + struct pci_dn *pdn = PCI_DN(dn); pdn->eeh_mode = 0; @@ -732,7 +729,7 @@ static void *early_enable_eeh(struct device_node *dn, void *data) /* This device doesn't support EEH, but it may have an * EEH parent, in which case we mark it as supported. */ - if (dn->parent && dn->parent->data + if (dn->parent && PCI_DN(dn->parent) && (PCI_DN(dn->parent)->eeh_mode & EEH_MODE_SUPPORTED)) { /* Parent supports EEH. */ pdn->eeh_mode |= EEH_MODE_SUPPORTED; @@ -745,7 +742,7 @@ static void *early_enable_eeh(struct device_node *dn, void *data) dn->full_name); } - return NULL; + return NULL; } /* @@ -793,13 +790,11 @@ void __init eeh_init(void) for (phb = of_find_node_by_name(NULL, "pci"); phb; phb = of_find_node_by_name(phb, "pci")) { unsigned long buid; - struct pci_dn *pci; buid = get_phb_buid(phb); - if (buid == 0 || phb->data == NULL) + if (buid == 0 || PCI_DN(phb) == NULL) continue; - pci = phb->data; info.buid_lo = BUID_LO(buid); info.buid_hi = BUID_HI(buid); traverse_pci_devices(phb, early_enable_eeh, &info); @@ -828,11 +823,13 @@ void eeh_add_device_early(struct device_node *dn) struct pci_controller *phb; struct eeh_early_enable_info info; - if (!dn || !dn->data) + if (!dn || !PCI_DN(dn)) return; phb = PCI_DN(dn)->phb; if (NULL == phb || 0 == phb->buid) { - printk(KERN_WARNING "EEH: Expected buid but found none\n"); + printk(KERN_WARNING "EEH: Expected buid but found none for %s\n", + dn->full_name); + dump_stack(); return; } -- cgit v1.2.3 From 56b0fca3a008ddec8c00cfdddbef17bd9ce188e3 Mon Sep 17 00:00:00 2001 From: Linas Vepstas Date: Thu, 3 Nov 2005 18:48:45 -0600 Subject: [PATCH] ppc64: PCI address cache minor fixes 03-eeh-addr-cache-cleanup.patch This is a minor patch to clean up a buglet related to the PCI address cache. (The buglet doesn't manifes itself unless there are also bugs elsewhere, which is why its minor.). Also: -- Improved debug printing. -- Declare some private routines as static -- Adds reference counting to struct pci_dn->pcidev structure Signed-off-by: Linas Vepstas Signed-off-by: Paul Mackerras --- arch/ppc64/kernel/eeh.c | 33 ++++++++++++++++++++++++++------- 1 file changed, 26 insertions(+), 7 deletions(-) (limited to 'arch/ppc64/kernel/eeh.c') diff --git a/arch/ppc64/kernel/eeh.c b/arch/ppc64/kernel/eeh.c index bb11569d2b4..99f11b66b5a 100644 --- a/arch/ppc64/kernel/eeh.c +++ b/arch/ppc64/kernel/eeh.c @@ -219,9 +219,9 @@ pci_addr_cache_insert(struct pci_dev *dev, unsigned long alo, while (*p) { parent = *p; piar = rb_entry(parent, struct pci_io_addr_range, rb_node); - if (alo < piar->addr_lo) { + if (ahi < piar->addr_lo) { p = &parent->rb_left; - } else if (ahi > piar->addr_hi) { + } else if (alo > piar->addr_hi) { p = &parent->rb_right; } else { if (dev != piar->pcidev || @@ -240,6 +240,11 @@ pci_addr_cache_insert(struct pci_dev *dev, unsigned long alo, piar->pcidev = dev; piar->flags = flags; +#ifdef DEBUG + printk(KERN_DEBUG "PIAR: insert range=[%lx:%lx] dev=%s\n", + alo, ahi, pci_name (dev)); +#endif + rb_link_node(&piar->rb_node, parent, p); rb_insert_color(&piar->rb_node, &pci_io_addr_cache_root.rb_root); @@ -301,7 +306,7 @@ static void __pci_addr_cache_insert_device(struct pci_dev *dev) * we maintain a cache of devices that can be quickly searched. * This routine adds a device to that cache. */ -void pci_addr_cache_insert_device(struct pci_dev *dev) +static void pci_addr_cache_insert_device(struct pci_dev *dev) { unsigned long flags; @@ -344,7 +349,7 @@ restart: * the tree multiple times (once per resource). * But so what; device removal doesn't need to be that fast. */ -void pci_addr_cache_remove_device(struct pci_dev *dev) +static void pci_addr_cache_remove_device(struct pci_dev *dev) { unsigned long flags; @@ -366,6 +371,9 @@ void __init pci_addr_cache_build(void) { struct pci_dev *dev = NULL; + if (!eeh_subsystem_enabled) + return; + spin_lock_init(&pci_io_addr_cache_root.piar_lock); while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { @@ -837,7 +845,7 @@ void eeh_add_device_early(struct device_node *dn) info.buid_lo = BUID_LO(phb->buid); early_enable_eeh(dn, &info); } -EXPORT_SYMBOL(eeh_add_device_early); +EXPORT_SYMBOL_GPL(eeh_add_device_early); /** * eeh_add_device_late - perform EEH initialization for the indicated pci device @@ -848,6 +856,8 @@ EXPORT_SYMBOL(eeh_add_device_early); */ void eeh_add_device_late(struct pci_dev *dev) { + struct device_node *dn; + if (!dev || !eeh_subsystem_enabled) return; @@ -855,9 +865,13 @@ void eeh_add_device_late(struct pci_dev *dev) printk(KERN_DEBUG "EEH: adding device %s\n", pci_name(dev)); #endif + pci_dev_get (dev); + dn = pci_device_to_OF_node(dev); + PCI_DN(dn)->pcidev = dev; + pci_addr_cache_insert_device (dev); } -EXPORT_SYMBOL(eeh_add_device_late); +EXPORT_SYMBOL_GPL(eeh_add_device_late); /** * eeh_remove_device - undo EEH setup for the indicated pci device @@ -868,6 +882,7 @@ EXPORT_SYMBOL(eeh_add_device_late); */ void eeh_remove_device(struct pci_dev *dev) { + struct device_node *dn; if (!dev || !eeh_subsystem_enabled) return; @@ -876,8 +891,12 @@ void eeh_remove_device(struct pci_dev *dev) printk(KERN_DEBUG "EEH: remove device %s\n", pci_name(dev)); #endif pci_addr_cache_remove_device(dev); + + dn = pci_device_to_OF_node(dev); + PCI_DN(dn)->pcidev = NULL; + pci_dev_put (dev); } -EXPORT_SYMBOL(eeh_remove_device); +EXPORT_SYMBOL_GPL(eeh_remove_device); static int proc_eeh_show(struct seq_file *m, void *v) { -- cgit v1.2.3 From 177bc9367efe89a642bc9a07351726fd2c31f5ff Mon Sep 17 00:00:00 2001 From: Linas Vepstas Date: Thu, 3 Nov 2005 18:48:52 -0600 Subject: [PATCH] ppc64: PCI error rate statistics 04-eeh-statistics.patch This minor patch adds some statistics-gathering counters that allow the behaviour of the EEH subsystem o be monitored. While far from perfect, it does provide a rudimentary device that makes understanding of the current state of the system a bit easier. Signed-off-by: Linas Vepstas Signed-off-by: Paul Mackerras --- arch/ppc64/kernel/eeh.c | 43 ++++++++++++++++++++++++++++++++----------- 1 file changed, 32 insertions(+), 11 deletions(-) (limited to 'arch/ppc64/kernel/eeh.c') diff --git a/arch/ppc64/kernel/eeh.c b/arch/ppc64/kernel/eeh.c index 99f11b66b5a..926d3110dfd 100644 --- a/arch/ppc64/kernel/eeh.c +++ b/arch/ppc64/kernel/eeh.c @@ -102,6 +102,10 @@ static DEFINE_SPINLOCK(slot_errbuf_lock); static int eeh_error_buf_size; /* System monitoring statistics */ +static DEFINE_PER_CPU(unsigned long, no_device); +static DEFINE_PER_CPU(unsigned long, no_dn); +static DEFINE_PER_CPU(unsigned long, no_cfg_addr); +static DEFINE_PER_CPU(unsigned long, ignored_check); static DEFINE_PER_CPU(unsigned long, total_mmio_ffs); static DEFINE_PER_CPU(unsigned long, false_positives); static DEFINE_PER_CPU(unsigned long, ignored_failures); @@ -493,8 +497,6 @@ static void eeh_event_handler(void *dummy) notifier_call_chain (&eeh_notifier_chain, EEH_NOTIFY_FREEZE, event); - __get_cpu_var(slot_resets)++; - pci_dev_put(event->dev); kfree(event); } @@ -546,17 +548,24 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) if (!eeh_subsystem_enabled) return 0; - if (!dn) + if (!dn) { + __get_cpu_var(no_dn)++; return 0; + } pdn = PCI_DN(dn); /* Access to IO BARs might get this far and still not want checking. */ if (!pdn->eeh_capable || !(pdn->eeh_mode & EEH_MODE_SUPPORTED) || pdn->eeh_mode & EEH_MODE_NOCHECK) { + __get_cpu_var(ignored_check)++; +#ifdef DEBUG + printk ("EEH:ignored check for %s %s\n", pci_name (dev), dn->full_name); +#endif return 0; } if (!pdn->eeh_config_addr) { + __get_cpu_var(no_cfg_addr)++; return 0; } @@ -590,6 +599,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) /* prevent repeated reports of this failure */ pdn->eeh_mode |= EEH_MODE_ISOLATED; + __get_cpu_var(slot_resets)++; reset_state = rets[0]; @@ -657,8 +667,10 @@ unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned lon /* Finding the phys addr + pci device; this is pretty quick. */ addr = eeh_token_to_phys((unsigned long __force) token); dev = pci_get_device_by_addr(addr); - if (!dev) + if (!dev) { + __get_cpu_var(no_device)++; return val; + } dn = pci_device_to_OF_node(dev); eeh_dn_check_failure (dn, dev); @@ -903,12 +915,17 @@ static int proc_eeh_show(struct seq_file *m, void *v) unsigned int cpu; unsigned long ffs = 0, positives = 0, failures = 0; unsigned long resets = 0; + unsigned long no_dev = 0, no_dn = 0, no_cfg = 0, no_check = 0; for_each_cpu(cpu) { ffs += per_cpu(total_mmio_ffs, cpu); positives += per_cpu(false_positives, cpu); failures += per_cpu(ignored_failures, cpu); resets += per_cpu(slot_resets, cpu); + no_dev += per_cpu(no_device, cpu); + no_dn += per_cpu(no_dn, cpu); + no_cfg += per_cpu(no_cfg_addr, cpu); + no_check += per_cpu(ignored_check, cpu); } if (0 == eeh_subsystem_enabled) { @@ -916,13 +933,17 @@ static int proc_eeh_show(struct seq_file *m, void *v) seq_printf(m, "eeh_total_mmio_ffs=%ld\n", ffs); } else { seq_printf(m, "EEH Subsystem is enabled\n"); - seq_printf(m, "eeh_total_mmio_ffs=%ld\n" - "eeh_false_positives=%ld\n" - "eeh_ignored_failures=%ld\n" - "eeh_slot_resets=%ld\n" - "eeh_fail_count=%d\n", - ffs, positives, failures, resets, - eeh_fail_count.counter); + seq_printf(m, + "no device=%ld\n" + "no device node=%ld\n" + "no config address=%ld\n" + "check not wanted=%ld\n" + "eeh_total_mmio_ffs=%ld\n" + "eeh_false_positives=%ld\n" + "eeh_ignored_failures=%ld\n" + "eeh_slot_resets=%ld\n", + no_dev, no_dn, no_cfg, no_check, + ffs, positives, failures, resets); } return 0; -- cgit v1.2.3 From df7242b1156966c3b1aa0fd2bc63e3736099b592 Mon Sep 17 00:00:00 2001 From: Linas Vepstas Date: Thu, 3 Nov 2005 18:49:01 -0600 Subject: [PATCH] ppc64: RTAS error reporting restructuring 05-eeh-slot-error-detail.patch This patch encapsulates a section of code that reports the EEH event. The new subroutine can be used in several places to report the error. Signed-off-by: Linas Vepstas Signed-off-by: Paul Mackerras --- arch/ppc64/kernel/eeh.c | 46 ++++++++++++++++++++++++++++++---------------- 1 file changed, 30 insertions(+), 16 deletions(-) (limited to 'arch/ppc64/kernel/eeh.c') diff --git a/arch/ppc64/kernel/eeh.c b/arch/ppc64/kernel/eeh.c index 926d3110dfd..b23159464ab 100644 --- a/arch/ppc64/kernel/eeh.c +++ b/arch/ppc64/kernel/eeh.c @@ -397,6 +397,28 @@ void __init pci_addr_cache_build(void) /* --------------------------------------------------------------- */ /* Above lies the PCI Address Cache. Below lies the EEH event infrastructure */ +void eeh_slot_error_detail (struct pci_dn *pdn, int severity) +{ + unsigned long flags; + int rc; + + /* Log the error with the rtas logger */ + spin_lock_irqsave(&slot_errbuf_lock, flags); + memset(slot_errbuf, 0, eeh_error_buf_size); + + rc = rtas_call(ibm_slot_error_detail, + 8, 1, NULL, pdn->eeh_config_addr, + BUID_HI(pdn->phb->buid), + BUID_LO(pdn->phb->buid), NULL, 0, + virt_to_phys(slot_errbuf), + eeh_error_buf_size, + severity); + + if (rc == 0) + log_error(slot_errbuf, ERR_TYPE_RTAS_LOG, 0); + spin_unlock_irqrestore(&slot_errbuf_lock, flags); +} + /** * eeh_register_notifier - Register to find out about EEH events. * @nb: notifier block to callback on events @@ -454,9 +476,12 @@ static void eeh_panic(struct pci_dev *dev, int reset_state) * Since the panic_on_oops sysctl is used to halt the system * in light of potential corruption, we can use it here. */ - if (panic_on_oops) + if (panic_on_oops) { + struct device_node *dn = pci_device_to_OF_node(dev); + eeh_slot_error_detail (PCI_DN(dn), 2 /* Permanent Error */); panic("EEH: MMIO failure (%d) on device:%s\n", reset_state, pci_name(dev)); + } else { __get_cpu_var(ignored_failures)++; printk(KERN_INFO "EEH: Ignored MMIO failure (%d) on device:%s\n", @@ -539,7 +564,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) int ret; int rets[3]; unsigned long flags; - int rc, reset_state; + int reset_state; struct eeh_event *event; struct pci_dn *pdn; @@ -603,20 +628,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) reset_state = rets[0]; - spin_lock_irqsave(&slot_errbuf_lock, flags); - memset(slot_errbuf, 0, eeh_error_buf_size); - - rc = rtas_call(ibm_slot_error_detail, - 8, 1, NULL, pdn->eeh_config_addr, - BUID_HI(pdn->phb->buid), - BUID_LO(pdn->phb->buid), NULL, 0, - virt_to_phys(slot_errbuf), - eeh_error_buf_size, - 1 /* Temporary Error */); - - if (rc == 0) - log_error(slot_errbuf, ERR_TYPE_RTAS_LOG, 0); - spin_unlock_irqrestore(&slot_errbuf_lock, flags); + eeh_slot_error_detail (pdn, 1 /* Temporary Error */); printk(KERN_INFO "EEH: MMIO failure (%d) on device: %s %s\n", rets[0], dn->name, dn->full_name); @@ -783,6 +795,8 @@ void __init eeh_init(void) struct device_node *phb, *np; struct eeh_early_enable_info info; + spin_lock_init(&slot_errbuf_lock); + np = of_find_node_by_path("/rtas"); if (np == NULL) return; -- cgit v1.2.3 From 76e6faf7a3a3ad3e18a1b70f9e4cd96cdf58140d Mon Sep 17 00:00:00 2001 From: Linas Vepstas Date: Thu, 3 Nov 2005 18:49:15 -0600 Subject: [PATCH] ppc64: avoid PCI error reporting for empty slots 06-eeh-empty-slot-error.patch Performing PCI config-space reads to empty PCI slots can lead to reports of "permanent failure" from the firmware. Ignore permanent failures on empty slots. Signed-off-by: Linas Vepstas Signed-off-by: Paul Mackerras --- arch/ppc64/kernel/eeh.c | 29 +++++++++++++++++++++++++++-- 1 file changed, 27 insertions(+), 2 deletions(-) (limited to 'arch/ppc64/kernel/eeh.c') diff --git a/arch/ppc64/kernel/eeh.c b/arch/ppc64/kernel/eeh.c index b23159464ab..0060934dffd 100644 --- a/arch/ppc64/kernel/eeh.c +++ b/arch/ppc64/kernel/eeh.c @@ -617,7 +617,32 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) * In any case they must share a common PHB. */ ret = read_slot_reset_state(pdn, rets); - if (!(ret == 0 && rets[1] == 1 && (rets[0] == 2 || rets[0] == 4))) { + + /* If the call to firmware failed, punt */ + if (ret != 0) { + printk(KERN_WARNING "EEH: read_slot_reset_state() failed; rc=%d dn=%s\n", + ret, dn->full_name); + __get_cpu_var(false_positives)++; + return 0; + } + + /* If EEH is not supported on this device, punt. */ + if (rets[1] != 1) { + printk(KERN_WARNING "EEH: event on unsupported device, rc=%d dn=%s\n", + ret, dn->full_name); + __get_cpu_var(false_positives)++; + return 0; + } + + /* If not the kind of error we know about, punt. */ + if (rets[0] != 2 && rets[0] != 4 && rets[0] != 5) { + __get_cpu_var(false_positives)++; + return 0; + } + + /* Note that config-io to empty slots may fail; + * we recognize empty because they don't have children. */ + if ((rets[0] == 5) && (dn->child == NULL)) { __get_cpu_var(false_positives)++; return 0; } @@ -650,7 +675,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) /* Most EEH events are due to device driver bugs. Having * a stack trace will help the device-driver authors figure * out what happened. So print that out. */ - dump_stack(); + if (rets[0] != 5) dump_stack(); schedule_work(&eeh_event_wq); return 0; -- cgit v1.2.3 From fd761fd876e4d1c0d07b6d93bc45c999fa596cb0 Mon Sep 17 00:00:00 2001 From: Linas Vepstas Date: Thu, 3 Nov 2005 18:49:23 -0600 Subject: [PATCH] ppc64: serialize reports of PCI errors 07-eeh-report-race.patch When a PCI slot is isolated, all PCI functions under that slot are affected. If hese functions have separate device drivers, the EEH isolation event might be reported multiple times. This patch adds a lock to prevent the racing of such multiple reports. It also marks every device under the slot as having experienced an EEH event, so that multiple reports may be recognized more easily. Signed-off-by: Linas Vepstas Signed-off-by: Paul Mackerras --- arch/ppc64/kernel/eeh.c | 98 ++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 85 insertions(+), 13 deletions(-) (limited to 'arch/ppc64/kernel/eeh.c') diff --git a/arch/ppc64/kernel/eeh.c b/arch/ppc64/kernel/eeh.c index 0060934dffd..e7522f6da69 100644 --- a/arch/ppc64/kernel/eeh.c +++ b/arch/ppc64/kernel/eeh.c @@ -96,6 +96,9 @@ static int ibm_slot_error_detail; static int eeh_subsystem_enabled; +/* Lock to avoid races due to multiple reports of an error */ +static DEFINE_SPINLOCK(confirm_error_lock); + /* Buffer for reporting slot-error-detail rtas calls */ static unsigned char slot_errbuf[RTAS_ERROR_LOG_MAX]; static DEFINE_SPINLOCK(slot_errbuf_lock); @@ -544,6 +547,55 @@ static inline unsigned long eeh_token_to_phys(unsigned long token) return pa | (token & (PAGE_SIZE-1)); } +/** + * Return the "partitionable endpoint" (pe) under which this device lies + */ +static struct device_node * find_device_pe(struct device_node *dn) +{ + while ((dn->parent) && PCI_DN(dn->parent) && + (PCI_DN(dn->parent)->eeh_mode & EEH_MODE_SUPPORTED)) { + dn = dn->parent; + } + return dn; +} + +/** Mark all devices that are peers of this device as failed. + * Mark the device driver too, so that it can see the failure + * immediately; this is critical, since some drivers poll + * status registers in interrupts ... If a driver is polling, + * and the slot is frozen, then the driver can deadlock in + * an interrupt context, which is bad. + */ + +static inline void __eeh_mark_slot (struct device_node *dn) +{ + while (dn) { + PCI_DN(dn)->eeh_mode |= EEH_MODE_ISOLATED; + + if (dn->child) + __eeh_mark_slot (dn->child); + dn = dn->sibling; + } +} + +static inline void __eeh_clear_slot (struct device_node *dn) +{ + while (dn) { + PCI_DN(dn)->eeh_mode &= ~EEH_MODE_ISOLATED; + if (dn->child) + __eeh_clear_slot (dn->child); + dn = dn->sibling; + } +} + +static inline void eeh_clear_slot (struct device_node *dn) +{ + unsigned long flags; + spin_lock_irqsave(&confirm_error_lock, flags); + __eeh_clear_slot (dn); + spin_unlock_irqrestore(&confirm_error_lock, flags); +} + /** * eeh_dn_check_failure - check if all 1's data is due to EEH slot freeze * @dn device node @@ -567,6 +619,8 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) int reset_state; struct eeh_event *event; struct pci_dn *pdn; + struct device_node *pe_dn; + int rc = 0; __get_cpu_var(total_mmio_ffs)++; @@ -594,10 +648,14 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) return 0; } - /* - * If we already have a pending isolation event for this - * slot, we know it's bad already, we don't need to check... + /* If we already have a pending isolation event for this + * slot, we know it's bad already, we don't need to check. + * Do this checking under a lock; as multiple PCI devices + * in one slot might report errors simultaneously, and we + * only want one error recovery routine running. */ + spin_lock_irqsave(&confirm_error_lock, flags); + rc = 1; if (pdn->eeh_mode & EEH_MODE_ISOLATED) { atomic_inc(&eeh_fail_count); if (atomic_read(&eeh_fail_count) >= EEH_MAX_FAILS) { @@ -606,7 +664,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) rets[0] = -1; /* reset state unknown */ eeh_panic(dev, rets[0]); } - return 0; + goto dn_unlock; } /* @@ -623,7 +681,8 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) printk(KERN_WARNING "EEH: read_slot_reset_state() failed; rc=%d dn=%s\n", ret, dn->full_name); __get_cpu_var(false_positives)++; - return 0; + rc = 0; + goto dn_unlock; } /* If EEH is not supported on this device, punt. */ @@ -631,25 +690,33 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) printk(KERN_WARNING "EEH: event on unsupported device, rc=%d dn=%s\n", ret, dn->full_name); __get_cpu_var(false_positives)++; - return 0; + rc = 0; + goto dn_unlock; } /* If not the kind of error we know about, punt. */ if (rets[0] != 2 && rets[0] != 4 && rets[0] != 5) { __get_cpu_var(false_positives)++; - return 0; + rc = 0; + goto dn_unlock; } /* Note that config-io to empty slots may fail; * we recognize empty because they don't have children. */ if ((rets[0] == 5) && (dn->child == NULL)) { __get_cpu_var(false_positives)++; - return 0; + rc = 0; + goto dn_unlock; } - /* prevent repeated reports of this failure */ - pdn->eeh_mode |= EEH_MODE_ISOLATED; - __get_cpu_var(slot_resets)++; + __get_cpu_var(slot_resets)++; + + /* Avoid repeated reports of this failure, including problems + * with other functions on this device, and functions under + * bridges. */ + pe_dn = find_device_pe (dn); + __eeh_mark_slot (pe_dn); + spin_unlock_irqrestore(&confirm_error_lock, flags); reset_state = rets[0]; @@ -678,10 +745,14 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) if (rets[0] != 5) dump_stack(); schedule_work(&eeh_event_wq); - return 0; + return 1; + +dn_unlock: + spin_unlock_irqrestore(&confirm_error_lock, flags); + return rc; } -EXPORT_SYMBOL(eeh_dn_check_failure); +EXPORT_SYMBOL_GPL(eeh_dn_check_failure); /** * eeh_check_failure - check if all 1's data is due to EEH slot freeze @@ -820,6 +891,7 @@ void __init eeh_init(void) struct device_node *phb, *np; struct eeh_early_enable_info info; + spin_lock_init(&confirm_error_lock); spin_lock_init(&slot_errbuf_lock); np = of_find_node_by_path("/rtas"); -- cgit v1.2.3 From 5c1344e988c716470b5609708215dd7f135f0e3a Mon Sep 17 00:00:00 2001 From: Linas Vepstas Date: Thu, 3 Nov 2005 18:49:31 -0600 Subject: [PATCH] ppc64: escape hatch for spinning interrupt deadlocks 08-eeh-spin-counter.patch One an EEH event is triggers, all further I/O to a device is blocked (until reset). Bad device drivers may end up spinning in their interrupt handlers, trying to read an interrupt status register that will never change state. This patch moves that spin counter to a per-device structure, and adds some diagnostic prints to help locate the bad driver. Signed-off-by: Linas Vepstas Signed-off-by: Paul Mackerras --- arch/ppc64/kernel/eeh.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) (limited to 'arch/ppc64/kernel/eeh.c') diff --git a/arch/ppc64/kernel/eeh.c b/arch/ppc64/kernel/eeh.c index e7522f6da69..0c52c2de92e 100644 --- a/arch/ppc64/kernel/eeh.c +++ b/arch/ppc64/kernel/eeh.c @@ -78,14 +78,12 @@ DECLARE_WORK(eeh_event_wq, eeh_event_handler, NULL); static struct notifier_block *eeh_notifier_chain; -/* - * If a device driver keeps reading an MMIO register in an interrupt +/* If a device driver keeps reading an MMIO register in an interrupt * handler after a slot isolation event has occurred, we assume it * is broken and panic. This sets the threshold for how many read * attempts we allow before panicking. */ -#define EEH_MAX_FAILS 1000 -static atomic_t eeh_fail_count; +#define EEH_MAX_FAILS 100000 /* RTAS tokens */ static int ibm_set_eeh_option; @@ -521,7 +519,6 @@ static void eeh_event_handler(void *dummy) "%s\n", event->reset_state, pci_name(event->dev)); - atomic_set(&eeh_fail_count, 0); notifier_call_chain (&eeh_notifier_chain, EEH_NOTIFY_FREEZE, event); @@ -657,12 +654,18 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) spin_lock_irqsave(&confirm_error_lock, flags); rc = 1; if (pdn->eeh_mode & EEH_MODE_ISOLATED) { - atomic_inc(&eeh_fail_count); - if (atomic_read(&eeh_fail_count) >= EEH_MAX_FAILS) { + pdn->eeh_check_count ++; + if (pdn->eeh_check_count >= EEH_MAX_FAILS) { + printk (KERN_ERR "EEH: Device driver ignored %d bad reads, panicing\n", + pdn->eeh_check_count); + dump_stack(); + /* re-read the slot reset state */ if (read_slot_reset_state(pdn, rets) != 0) rets[0] = -1; /* reset state unknown */ - eeh_panic(dev, rets[0]); + + /* If we are here, then we hit an infinite loop. Stop. */ + panic("EEH: MMIO halt (%d) on device:%s\n", rets[0], pci_name(dev)); } goto dn_unlock; } @@ -808,6 +811,8 @@ static void *early_enable_eeh(struct device_node *dn, void *data) struct pci_dn *pdn = PCI_DN(dn); pdn->eeh_mode = 0; + pdn->eeh_check_count = 0; + pdn->eeh_freeze_count = 0; if (status && strcmp(status, "ok") != 0) return NULL; /* ignore devices with bad status */ -- cgit v1.2.3 From f8632c822719cce08cfb128859e354007744cbba Mon Sep 17 00:00:00 2001 From: Linas Vepstas Date: Thu, 3 Nov 2005 18:49:45 -0600 Subject: [PATCH] ppc64: bugfix: don't silently ignore PCI errors 10-EEH-enable-bugfix.patch Bugfix: With the curent linux-2.6.14-rc2-git6, EEH errors are ignored because thier detection requires an unused, uninitialized flag to be set. This patch removes the unused flag. Signed-off-by: Linas Vepstas Signed-off-by: Paul Mackerras --- arch/ppc64/kernel/eeh.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'arch/ppc64/kernel/eeh.c') diff --git a/arch/ppc64/kernel/eeh.c b/arch/ppc64/kernel/eeh.c index 0c52c2de92e..9df1d501836 100644 --- a/arch/ppc64/kernel/eeh.c +++ b/arch/ppc64/kernel/eeh.c @@ -631,11 +631,12 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) pdn = PCI_DN(dn); /* Access to IO BARs might get this far and still not want checking. */ - if (!pdn->eeh_capable || !(pdn->eeh_mode & EEH_MODE_SUPPORTED) || + if (!(pdn->eeh_mode & EEH_MODE_SUPPORTED) || pdn->eeh_mode & EEH_MODE_NOCHECK) { __get_cpu_var(ignored_check)++; #ifdef DEBUG - printk ("EEH:ignored check for %s %s\n", pci_name (dev), dn->full_name); + printk ("EEH:ignored check (%x) for %s %s\n", + pdn->eeh_mode, pci_name (dev), dn->full_name); #endif return 0; } -- cgit v1.2.3 From 7f79da7accd63a6adb84f4602f66779f6a701e7b Mon Sep 17 00:00:00 2001 From: Linas Vepstas Date: Thu, 3 Nov 2005 18:49:51 -0600 Subject: [PATCH] ppc64: move eeh.c to powerpc directory from ppc64 11-eeh-move-to-powerpc.patch Move arch/ppc64/kernel/eeh.c to arch//powerpc/platforms/pseries/eeh.c No other changes (except for Makefile to build it) Signed-off-by: Linas Vepstas Signed-off-by: Paul Mackerras --- arch/ppc64/kernel/eeh.c | 1093 ----------------------------------------------- 1 file changed, 1093 deletions(-) delete mode 100644 arch/ppc64/kernel/eeh.c (limited to 'arch/ppc64/kernel/eeh.c') diff --git a/arch/ppc64/kernel/eeh.c b/arch/ppc64/kernel/eeh.c deleted file mode 100644 index 9df1d501836..00000000000 --- a/arch/ppc64/kernel/eeh.c +++ /dev/null @@ -1,1093 +0,0 @@ -/* - * eeh.c - * Copyright (C) 2001 Dave Engebretsen & Todd Inglett 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#undef DEBUG - -/** Overview: - * EEH, or "Extended Error Handling" is a PCI bridge technology for - * dealing with PCI bus errors that can't be dealt with within the - * usual PCI framework, except by check-stopping the CPU. Systems - * that are designed for high-availability/reliability cannot afford - * to crash due to a "mere" PCI error, thus the need for EEH. - * An EEH-capable bridge operates by converting a detected error - * into a "slot freeze", taking the PCI adapter off-line, making - * the slot behave, from the OS'es point of view, as if the slot - * were "empty": all reads return 0xff's and all writes are silently - * ignored. EEH slot isolation events can be triggered by parity - * errors on the address or data busses (e.g. during posted writes), - * which in turn might be caused by low voltage on the bus, dust, - * vibration, humidity, radioactivity or plain-old failed hardware. - * - * Note, however, that one of the leading causes of EEH slot - * freeze events are buggy device drivers, buggy device microcode, - * or buggy device hardware. This is because any attempt by the - * device to bus-master data to a memory address that is not - * assigned to the device will trigger a slot freeze. (The idea - * is to prevent devices-gone-wild from corrupting system memory). - * Buggy hardware/drivers will have a miserable time co-existing - * with EEH. - * - * Ideally, a PCI device driver, when suspecting that an isolation - * event has occured (e.g. by reading 0xff's), will then ask EEH - * whether this is the case, and then take appropriate steps to - * reset the PCI slot, the PCI device, and then resume operations. - * However, until that day, the checking is done here, with the - * eeh_check_failure() routine embedded in the MMIO macros. If - * the slot is found to be isolated, an "EEH Event" is synthesized - * and sent out for processing. - */ - -/* EEH event workqueue setup. */ -static DEFINE_SPINLOCK(eeh_eventlist_lock); -LIST_HEAD(eeh_eventlist); -static void eeh_event_handler(void *); -DECLARE_WORK(eeh_event_wq, eeh_event_handler, NULL); - -static struct notifier_block *eeh_notifier_chain; - -/* If a device driver keeps reading an MMIO register in an interrupt - * handler after a slot isolation event has occurred, we assume it - * is broken and panic. This sets the threshold for how many read - * attempts we allow before panicking. - */ -#define EEH_MAX_FAILS 100000 - -/* RTAS tokens */ -static int ibm_set_eeh_option; -static int ibm_set_slot_reset; -static int ibm_read_slot_reset_state; -static int ibm_read_slot_reset_state2; -static int ibm_slot_error_detail; - -static int eeh_subsystem_enabled; - -/* Lock to avoid races due to multiple reports of an error */ -static DEFINE_SPINLOCK(confirm_error_lock); - -/* Buffer for reporting slot-error-detail rtas calls */ -static unsigned char slot_errbuf[RTAS_ERROR_LOG_MAX]; -static DEFINE_SPINLOCK(slot_errbuf_lock); -static int eeh_error_buf_size; - -/* System monitoring statistics */ -static DEFINE_PER_CPU(unsigned long, no_device); -static DEFINE_PER_CPU(unsigned long, no_dn); -static DEFINE_PER_CPU(unsigned long, no_cfg_addr); -static DEFINE_PER_CPU(unsigned long, ignored_check); -static DEFINE_PER_CPU(unsigned long, total_mmio_ffs); -static DEFINE_PER_CPU(unsigned long, false_positives); -static DEFINE_PER_CPU(unsigned long, ignored_failures); -static DEFINE_PER_CPU(unsigned long, slot_resets); - -/** - * The pci address cache subsystem. This subsystem places - * PCI device address resources into a red-black tree, sorted - * according to the address range, so that given only an i/o - * address, the corresponding PCI device can be **quickly** - * found. It is safe to perform an address lookup in an interrupt - * context; this ability is an important feature. - * - * Currently, the only customer of this code is the EEH subsystem; - * thus, this code has been somewhat tailored to suit EEH better. - * In particular, the cache does *not* hold the addresses of devices - * for which EEH is not enabled. - * - * (Implementation Note: The RB tree seems to be better/faster - * than any hash algo I could think of for this problem, even - * with the penalty of slow pointer chases for d-cache misses). - */ -struct pci_io_addr_range -{ - struct rb_node rb_node; - unsigned long addr_lo; - unsigned long addr_hi; - struct pci_dev *pcidev; - unsigned int flags; -}; - -static struct pci_io_addr_cache -{ - struct rb_root rb_root; - spinlock_t piar_lock; -} pci_io_addr_cache_root; - -static inline struct pci_dev *__pci_get_device_by_addr(unsigned long addr) -{ - struct rb_node *n = pci_io_addr_cache_root.rb_root.rb_node; - - while (n) { - struct pci_io_addr_range *piar; - piar = rb_entry(n, struct pci_io_addr_range, rb_node); - - if (addr < piar->addr_lo) { - n = n->rb_left; - } else { - if (addr > piar->addr_hi) { - n = n->rb_right; - } else { - pci_dev_get(piar->pcidev); - return piar->pcidev; - } - } - } - - return NULL; -} - -/** - * pci_get_device_by_addr - Get device, given only address - * @addr: mmio (PIO) phys address or i/o port number - * - * Given an mmio phys address, or a port number, find a pci device - * that implements this address. Be sure to pci_dev_put the device - * when finished. I/O port numbers are assumed to be offset - * from zero (that is, they do *not* have pci_io_addr added in). - * It is safe to call this function within an interrupt. - */ -static struct pci_dev *pci_get_device_by_addr(unsigned long addr) -{ - struct pci_dev *dev; - unsigned long flags; - - spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags); - dev = __pci_get_device_by_addr(addr); - spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags); - return dev; -} - -#ifdef DEBUG -/* - * Handy-dandy debug print routine, does nothing more - * than print out the contents of our addr cache. - */ -static void pci_addr_cache_print(struct pci_io_addr_cache *cache) -{ - struct rb_node *n; - int cnt = 0; - - n = rb_first(&cache->rb_root); - while (n) { - struct pci_io_addr_range *piar; - piar = rb_entry(n, struct pci_io_addr_range, rb_node); - printk(KERN_DEBUG "PCI: %s addr range %d [%lx-%lx]: %s\n", - (piar->flags & IORESOURCE_IO) ? "i/o" : "mem", cnt, - piar->addr_lo, piar->addr_hi, pci_name(piar->pcidev)); - cnt++; - n = rb_next(n); - } -} -#endif - -/* Insert address range into the rb tree. */ -static struct pci_io_addr_range * -pci_addr_cache_insert(struct pci_dev *dev, unsigned long alo, - unsigned long ahi, unsigned int flags) -{ - struct rb_node **p = &pci_io_addr_cache_root.rb_root.rb_node; - struct rb_node *parent = NULL; - struct pci_io_addr_range *piar; - - /* Walk tree, find a place to insert into tree */ - while (*p) { - parent = *p; - piar = rb_entry(parent, struct pci_io_addr_range, rb_node); - if (ahi < piar->addr_lo) { - p = &parent->rb_left; - } else if (alo > piar->addr_hi) { - p = &parent->rb_right; - } else { - if (dev != piar->pcidev || - alo != piar->addr_lo || ahi != piar->addr_hi) { - printk(KERN_WARNING "PIAR: overlapping address range\n"); - } - return piar; - } - } - piar = (struct pci_io_addr_range *)kmalloc(sizeof(struct pci_io_addr_range), GFP_ATOMIC); - if (!piar) - return NULL; - - piar->addr_lo = alo; - piar->addr_hi = ahi; - piar->pcidev = dev; - piar->flags = flags; - -#ifdef DEBUG - printk(KERN_DEBUG "PIAR: insert range=[%lx:%lx] dev=%s\n", - alo, ahi, pci_name (dev)); -#endif - - rb_link_node(&piar->rb_node, parent, p); - rb_insert_color(&piar->rb_node, &pci_io_addr_cache_root.rb_root); - - return piar; -} - -static void __pci_addr_cache_insert_device(struct pci_dev *dev) -{ - struct device_node *dn; - struct pci_dn *pdn; - int i; - int inserted = 0; - - dn = pci_device_to_OF_node(dev); - if (!dn) { - printk(KERN_WARNING "PCI: no pci dn found for dev=%s\n", pci_name(dev)); - return; - } - - /* Skip any devices for which EEH is not enabled. */ - pdn = PCI_DN(dn); - if (!(pdn->eeh_mode & EEH_MODE_SUPPORTED) || - pdn->eeh_mode & EEH_MODE_NOCHECK) { -#ifdef DEBUG - printk(KERN_INFO "PCI: skip building address cache for=%s - %s\n", - pci_name(dev), pdn->node->full_name); -#endif - return; - } - - /* The cache holds a reference to the device... */ - pci_dev_get(dev); - - /* Walk resources on this device, poke them into the tree */ - for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { - unsigned long start = pci_resource_start(dev,i); - unsigned long end = pci_resource_end(dev,i); - unsigned int flags = pci_resource_flags(dev,i); - - /* We are interested only bus addresses, not dma or other stuff */ - if (0 == (flags & (IORESOURCE_IO | IORESOURCE_MEM))) - continue; - if (start == 0 || ~start == 0 || end == 0 || ~end == 0) - continue; - pci_addr_cache_insert(dev, start, end, flags); - inserted = 1; - } - - /* If there was nothing to add, the cache has no reference... */ - if (!inserted) - pci_dev_put(dev); -} - -/** - * pci_addr_cache_insert_device - Add a device to the address cache - * @dev: PCI device whose I/O addresses we are interested in. - * - * In order to support the fast lookup of devices based on addresses, - * we maintain a cache of devices that can be quickly searched. - * This routine adds a device to that cache. - */ -static void pci_addr_cache_insert_device(struct pci_dev *dev) -{ - unsigned long flags; - - spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags); - __pci_addr_cache_insert_device(dev); - spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags); -} - -static inline void __pci_addr_cache_remove_device(struct pci_dev *dev) -{ - struct rb_node *n; - int removed = 0; - -restart: - n = rb_first(&pci_io_addr_cache_root.rb_root); - while (n) { - struct pci_io_addr_range *piar; - piar = rb_entry(n, struct pci_io_addr_range, rb_node); - - if (piar->pcidev == dev) { - rb_erase(n, &pci_io_addr_cache_root.rb_root); - removed = 1; - kfree(piar); - goto restart; - } - n = rb_next(n); - } - - /* The cache no longer holds its reference to this device... */ - if (removed) - pci_dev_put(dev); -} - -/** - * pci_addr_cache_remove_device - remove pci device from addr cache - * @dev: device to remove - * - * Remove a device from the addr-cache tree. - * This is potentially expensive, since it will walk - * the tree multiple times (once per resource). - * But so what; device removal doesn't need to be that fast. - */ -static void pci_addr_cache_remove_device(struct pci_dev *dev) -{ - unsigned long flags; - - spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags); - __pci_addr_cache_remove_device(dev); - spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags); -} - -/** - * pci_addr_cache_build - Build a cache of I/O addresses - * - * Build a cache of pci i/o addresses. This cache will be used to - * find the pci device that corresponds to a given address. - * This routine scans all pci busses to build the cache. - * Must be run late in boot process, after the pci controllers - * have been scaned for devices (after all device resources are known). - */ -void __init pci_addr_cache_build(void) -{ - struct pci_dev *dev = NULL; - - if (!eeh_subsystem_enabled) - return; - - spin_lock_init(&pci_io_addr_cache_root.piar_lock); - - while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { - /* Ignore PCI bridges ( XXX why ??) */ - if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE) { - continue; - } - pci_addr_cache_insert_device(dev); - } - -#ifdef DEBUG - /* Verify tree built up above, echo back the list of addrs. */ - pci_addr_cache_print(&pci_io_addr_cache_root); -#endif -} - -/* --------------------------------------------------------------- */ -/* Above lies the PCI Address Cache. Below lies the EEH event infrastructure */ - -void eeh_slot_error_detail (struct pci_dn *pdn, int severity) -{ - unsigned long flags; - int rc; - - /* Log the error with the rtas logger */ - spin_lock_irqsave(&slot_errbuf_lock, flags); - memset(slot_errbuf, 0, eeh_error_buf_size); - - rc = rtas_call(ibm_slot_error_detail, - 8, 1, NULL, pdn->eeh_config_addr, - BUID_HI(pdn->phb->buid), - BUID_LO(pdn->phb->buid), NULL, 0, - virt_to_phys(slot_errbuf), - eeh_error_buf_size, - severity); - - if (rc == 0) - log_error(slot_errbuf, ERR_TYPE_RTAS_LOG, 0); - spin_unlock_irqrestore(&slot_errbuf_lock, flags); -} - -/** - * eeh_register_notifier - Register to find out about EEH events. - * @nb: notifier block to callback on events - */ -int eeh_register_notifier(struct notifier_block *nb) -{ - return notifier_chain_register(&eeh_notifier_chain, nb); -} - -/** - * eeh_unregister_notifier - Unregister to an EEH event notifier. - * @nb: notifier block to callback on events - */ -int eeh_unregister_notifier(struct notifier_block *nb) -{ - return notifier_chain_unregister(&eeh_notifier_chain, nb); -} - -/** - * read_slot_reset_state - Read the reset state of a device node's slot - * @dn: device node to read - * @rets: array to return results in - */ -static int read_slot_reset_state(struct pci_dn *pdn, int rets[]) -{ - int token, outputs; - - if (ibm_read_slot_reset_state2 != RTAS_UNKNOWN_SERVICE) { - token = ibm_read_slot_reset_state2; - outputs = 4; - } else { - token = ibm_read_slot_reset_state; - rets[2] = 0; /* fake PE Unavailable info */ - outputs = 3; - } - - return rtas_call(token, 3, outputs, rets, pdn->eeh_config_addr, - BUID_HI(pdn->phb->buid), BUID_LO(pdn->phb->buid)); -} - -/** - * eeh_panic - call panic() for an eeh event that cannot be handled. - * The philosophy of this routine is that it is better to panic and - * halt the OS than it is to risk possible data corruption by - * oblivious device drivers that don't know better. - * - * @dev pci device that had an eeh event - * @reset_state current reset state of the device slot - */ -static void eeh_panic(struct pci_dev *dev, int reset_state) -{ - /* - * XXX We should create a separate sysctl for this. - * - * Since the panic_on_oops sysctl is used to halt the system - * in light of potential corruption, we can use it here. - */ - if (panic_on_oops) { - struct device_node *dn = pci_device_to_OF_node(dev); - eeh_slot_error_detail (PCI_DN(dn), 2 /* Permanent Error */); - panic("EEH: MMIO failure (%d) on device:%s\n", reset_state, - pci_name(dev)); - } - else { - __get_cpu_var(ignored_failures)++; - printk(KERN_INFO "EEH: Ignored MMIO failure (%d) on device:%s\n", - reset_state, pci_name(dev)); - } -} - -/** - * eeh_event_handler - dispatch EEH events. The detection of a frozen - * slot can occur inside an interrupt, where it can be hard to do - * anything about it. The goal of this routine is to pull these - * detection events out of the context of the interrupt handler, and - * re-dispatch them for processing at a later time in a normal context. - * - * @dummy - unused - */ -static void eeh_event_handler(void *dummy) -{ - unsigned long flags; - struct eeh_event *event; - - while (1) { - spin_lock_irqsave(&eeh_eventlist_lock, flags); - event = NULL; - if (!list_empty(&eeh_eventlist)) { - event = list_entry(eeh_eventlist.next, struct eeh_event, list); - list_del(&event->list); - } - spin_unlock_irqrestore(&eeh_eventlist_lock, flags); - if (event == NULL) - break; - - printk(KERN_INFO "EEH: MMIO failure (%d), notifiying device " - "%s\n", event->reset_state, - pci_name(event->dev)); - - notifier_call_chain (&eeh_notifier_chain, - EEH_NOTIFY_FREEZE, event); - - pci_dev_put(event->dev); - kfree(event); - } -} - -/** - * eeh_token_to_phys - convert EEH address token to phys address - * @token i/o token, should be address in the form 0xA.... - */ -static inline unsigned long eeh_token_to_phys(unsigned long token) -{ - pte_t *ptep; - unsigned long pa; - - ptep = find_linux_pte(init_mm.pgd, token); - if (!ptep) - return token; - pa = pte_pfn(*ptep) << PAGE_SHIFT; - - return pa | (token & (PAGE_SIZE-1)); -} - -/** - * Return the "partitionable endpoint" (pe) under which this device lies - */ -static struct device_node * find_device_pe(struct device_node *dn) -{ - while ((dn->parent) && PCI_DN(dn->parent) && - (PCI_DN(dn->parent)->eeh_mode & EEH_MODE_SUPPORTED)) { - dn = dn->parent; - } - return dn; -} - -/** Mark all devices that are peers of this device as failed. - * Mark the device driver too, so that it can see the failure - * immediately; this is critical, since some drivers poll - * status registers in interrupts ... If a driver is polling, - * and the slot is frozen, then the driver can deadlock in - * an interrupt context, which is bad. - */ - -static inline void __eeh_mark_slot (struct device_node *dn) -{ - while (dn) { - PCI_DN(dn)->eeh_mode |= EEH_MODE_ISOLATED; - - if (dn->child) - __eeh_mark_slot (dn->child); - dn = dn->sibling; - } -} - -static inline void __eeh_clear_slot (struct device_node *dn) -{ - while (dn) { - PCI_DN(dn)->eeh_mode &= ~EEH_MODE_ISOLATED; - if (dn->child) - __eeh_clear_slot (dn->child); - dn = dn->sibling; - } -} - -static inline void eeh_clear_slot (struct device_node *dn) -{ - unsigned long flags; - spin_lock_irqsave(&confirm_error_lock, flags); - __eeh_clear_slot (dn); - spin_unlock_irqrestore(&confirm_error_lock, flags); -} - -/** - * eeh_dn_check_failure - check if all 1's data is due to EEH slot freeze - * @dn device node - * @dev pci device, if known - * - * Check for an EEH failure for the given device node. Call this - * routine if the result of a read was all 0xff's and you want to - * find out if this is due to an EEH slot freeze. This routine - * will query firmware for the EEH status. - * - * Returns 0 if there has not been an EEH error; otherwise returns - * a non-zero value and queues up a slot isolation event notification. - * - * It is safe to call this routine in an interrupt context. - */ -int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) -{ - int ret; - int rets[3]; - unsigned long flags; - int reset_state; - struct eeh_event *event; - struct pci_dn *pdn; - struct device_node *pe_dn; - int rc = 0; - - __get_cpu_var(total_mmio_ffs)++; - - if (!eeh_subsystem_enabled) - return 0; - - if (!dn) { - __get_cpu_var(no_dn)++; - return 0; - } - pdn = PCI_DN(dn); - - /* Access to IO BARs might get this far and still not want checking. */ - if (!(pdn->eeh_mode & EEH_MODE_SUPPORTED) || - pdn->eeh_mode & EEH_MODE_NOCHECK) { - __get_cpu_var(ignored_check)++; -#ifdef DEBUG - printk ("EEH:ignored check (%x) for %s %s\n", - pdn->eeh_mode, pci_name (dev), dn->full_name); -#endif - return 0; - } - - if (!pdn->eeh_config_addr) { - __get_cpu_var(no_cfg_addr)++; - return 0; - } - - /* If we already have a pending isolation event for this - * slot, we know it's bad already, we don't need to check. - * Do this checking under a lock; as multiple PCI devices - * in one slot might report errors simultaneously, and we - * only want one error recovery routine running. - */ - spin_lock_irqsave(&confirm_error_lock, flags); - rc = 1; - if (pdn->eeh_mode & EEH_MODE_ISOLATED) { - pdn->eeh_check_count ++; - if (pdn->eeh_check_count >= EEH_MAX_FAILS) { - printk (KERN_ERR "EEH: Device driver ignored %d bad reads, panicing\n", - pdn->eeh_check_count); - dump_stack(); - - /* re-read the slot reset state */ - if (read_slot_reset_state(pdn, rets) != 0) - rets[0] = -1; /* reset state unknown */ - - /* If we are here, then we hit an infinite loop. Stop. */ - panic("EEH: MMIO halt (%d) on device:%s\n", rets[0], pci_name(dev)); - } - goto dn_unlock; - } - - /* - * Now test for an EEH failure. This is VERY expensive. - * Note that the eeh_config_addr may be a parent device - * in the case of a device behind a bridge, or it may be - * function zero of a multi-function device. - * In any case they must share a common PHB. - */ - ret = read_slot_reset_state(pdn, rets); - - /* If the call to firmware failed, punt */ - if (ret != 0) { - printk(KERN_WARNING "EEH: read_slot_reset_state() failed; rc=%d dn=%s\n", - ret, dn->full_name); - __get_cpu_var(false_positives)++; - rc = 0; - goto dn_unlock; - } - - /* If EEH is not supported on this device, punt. */ - if (rets[1] != 1) { - printk(KERN_WARNING "EEH: event on unsupported device, rc=%d dn=%s\n", - ret, dn->full_name); - __get_cpu_var(false_positives)++; - rc = 0; - goto dn_unlock; - } - - /* If not the kind of error we know about, punt. */ - if (rets[0] != 2 && rets[0] != 4 && rets[0] != 5) { - __get_cpu_var(false_positives)++; - rc = 0; - goto dn_unlock; - } - - /* Note that config-io to empty slots may fail; - * we recognize empty because they don't have children. */ - if ((rets[0] == 5) && (dn->child == NULL)) { - __get_cpu_var(false_positives)++; - rc = 0; - goto dn_unlock; - } - - __get_cpu_var(slot_resets)++; - - /* Avoid repeated reports of this failure, including problems - * with other functions on this device, and functions under - * bridges. */ - pe_dn = find_device_pe (dn); - __eeh_mark_slot (pe_dn); - spin_unlock_irqrestore(&confirm_error_lock, flags); - - reset_state = rets[0]; - - eeh_slot_error_detail (pdn, 1 /* Temporary Error */); - - printk(KERN_INFO "EEH: MMIO failure (%d) on device: %s %s\n", - rets[0], dn->name, dn->full_name); - event = kmalloc(sizeof(*event), GFP_ATOMIC); - if (event == NULL) { - eeh_panic(dev, reset_state); - return 1; - } - - event->dev = dev; - event->dn = dn; - event->reset_state = reset_state; - - /* We may or may not be called in an interrupt context */ - spin_lock_irqsave(&eeh_eventlist_lock, flags); - list_add(&event->list, &eeh_eventlist); - spin_unlock_irqrestore(&eeh_eventlist_lock, flags); - - /* Most EEH events are due to device driver bugs. Having - * a stack trace will help the device-driver authors figure - * out what happened. So print that out. */ - if (rets[0] != 5) dump_stack(); - schedule_work(&eeh_event_wq); - - return 1; - -dn_unlock: - spin_unlock_irqrestore(&confirm_error_lock, flags); - return rc; -} - -EXPORT_SYMBOL_GPL(eeh_dn_check_failure); - -/** - * eeh_check_failure - check if all 1's data is due to EEH slot freeze - * @token i/o token, should be address in the form 0xA.... - * @val value, should be all 1's (XXX why do we need this arg??) - * - * Check for an EEH failure at the given token address. Call this - * routine if the result of a read was all 0xff's and you want to - * find out if this is due to an EEH slot freeze event. This routine - * will query firmware for the EEH status. - * - * Note this routine is safe to call in an interrupt context. - */ -unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val) -{ - unsigned long addr; - struct pci_dev *dev; - struct device_node *dn; - - /* Finding the phys addr + pci device; this is pretty quick. */ - addr = eeh_token_to_phys((unsigned long __force) token); - dev = pci_get_device_by_addr(addr); - if (!dev) { - __get_cpu_var(no_device)++; - return val; - } - - dn = pci_device_to_OF_node(dev); - eeh_dn_check_failure (dn, dev); - - pci_dev_put(dev); - return val; -} - -EXPORT_SYMBOL(eeh_check_failure); - -struct eeh_early_enable_info { - unsigned int buid_hi; - unsigned int buid_lo; -}; - -/* Enable eeh for the given device node. */ -static void *early_enable_eeh(struct device_node *dn, void *data) -{ - struct eeh_early_enable_info *info = data; - int ret; - char *status = get_property(dn, "status", NULL); - u32 *class_code = (u32 *)get_property(dn, "class-code", NULL); - u32 *vendor_id = (u32 *)get_property(dn, "vendor-id", NULL); - u32 *device_id = (u32 *)get_property(dn, "device-id", NULL); - u32 *regs; - int enable; - struct pci_dn *pdn = PCI_DN(dn); - - pdn->eeh_mode = 0; - pdn->eeh_check_count = 0; - pdn->eeh_freeze_count = 0; - - if (status && strcmp(status, "ok") != 0) - return NULL; /* ignore devices with bad status */ - - /* Ignore bad nodes. */ - if (!class_code || !vendor_id || !device_id) - return NULL; - - /* There is nothing to check on PCI to ISA bridges */ - if (dn->type && !strcmp(dn->type, "isa")) { - pdn->eeh_mode |= EEH_MODE_NOCHECK; - return NULL; - } - - /* - * Now decide if we are going to "Disable" EEH checking - * for this device. We still run with the EEH hardware active, - * but we won't be checking for ff's. This means a driver - * could return bad data (very bad!), an interrupt handler could - * hang waiting on status bits that won't change, etc. - * But there are a few cases like display devices that make sense. - */ - enable = 1; /* i.e. we will do checking */ - if ((*class_code >> 16) == PCI_BASE_CLASS_DISPLAY) - enable = 0; - - if (!enable) - pdn->eeh_mode |= EEH_MODE_NOCHECK; - - /* Ok... see if this device supports EEH. Some do, some don't, - * and the only way to find out is to check each and every one. */ - regs = (u32 *)get_property(dn, "reg", NULL); - if (regs) { - /* First register entry is addr (00BBSS00) */ - /* Try to enable eeh */ - ret = rtas_call(ibm_set_eeh_option, 4, 1, NULL, - regs[0], info->buid_hi, info->buid_lo, - EEH_ENABLE); - if (ret == 0) { - eeh_subsystem_enabled = 1; - pdn->eeh_mode |= EEH_MODE_SUPPORTED; - pdn->eeh_config_addr = regs[0]; -#ifdef DEBUG - printk(KERN_DEBUG "EEH: %s: eeh enabled\n", dn->full_name); -#endif - } else { - - /* This device doesn't support EEH, but it may have an - * EEH parent, in which case we mark it as supported. */ - if (dn->parent && PCI_DN(dn->parent) - && (PCI_DN(dn->parent)->eeh_mode & EEH_MODE_SUPPORTED)) { - /* Parent supports EEH. */ - pdn->eeh_mode |= EEH_MODE_SUPPORTED; - pdn->eeh_config_addr = PCI_DN(dn->parent)->eeh_config_addr; - return NULL; - } - } - } else { - printk(KERN_WARNING "EEH: %s: unable to get reg property.\n", - dn->full_name); - } - - return NULL; -} - -/* - * Initialize EEH by trying to enable it for all of the adapters in the system. - * As a side effect we can determine here if eeh is supported at all. - * Note that we leave EEH on so failed config cycles won't cause a machine - * check. If a user turns off EEH for a particular adapter they are really - * telling Linux to ignore errors. Some hardware (e.g. POWER5) won't - * grant access to a slot if EEH isn't enabled, and so we always enable - * EEH for all slots/all devices. - * - * The eeh-force-off option disables EEH checking globally, for all slots. - * Even if force-off is set, the EEH hardware is still enabled, so that - * newer systems can boot. - */ -void __init eeh_init(void) -{ - struct device_node *phb, *np; - struct eeh_early_enable_info info; - - spin_lock_init(&confirm_error_lock); - spin_lock_init(&slot_errbuf_lock); - - np = of_find_node_by_path("/rtas"); - if (np == NULL) - return; - - ibm_set_eeh_option = rtas_token("ibm,set-eeh-option"); - ibm_set_slot_reset = rtas_token("ibm,set-slot-reset"); - ibm_read_slot_reset_state2 = rtas_token("ibm,read-slot-reset-state2"); - ibm_read_slot_reset_state = rtas_token("ibm,read-slot-reset-state"); - ibm_slot_error_detail = rtas_token("ibm,slot-error-detail"); - - if (ibm_set_eeh_option == RTAS_UNKNOWN_SERVICE) - return; - - eeh_error_buf_size = rtas_token("rtas-error-log-max"); - if (eeh_error_buf_size == RTAS_UNKNOWN_SERVICE) { - eeh_error_buf_size = 1024; - } - if (eeh_error_buf_size > RTAS_ERROR_LOG_MAX) { - printk(KERN_WARNING "EEH: rtas-error-log-max is bigger than allocated " - "buffer ! (%d vs %d)", eeh_error_buf_size, RTAS_ERROR_LOG_MAX); - eeh_error_buf_size = RTAS_ERROR_LOG_MAX; - } - - /* Enable EEH for all adapters. Note that eeh requires buid's */ - for (phb = of_find_node_by_name(NULL, "pci"); phb; - phb = of_find_node_by_name(phb, "pci")) { - unsigned long buid; - - buid = get_phb_buid(phb); - if (buid == 0 || PCI_DN(phb) == NULL) - continue; - - info.buid_lo = BUID_LO(buid); - info.buid_hi = BUID_HI(buid); - traverse_pci_devices(phb, early_enable_eeh, &info); - } - - if (eeh_subsystem_enabled) - printk(KERN_INFO "EEH: PCI Enhanced I/O Error Handling Enabled\n"); - else - printk(KERN_WARNING "EEH: No capable adapters found\n"); -} - -/** - * eeh_add_device_early - enable EEH for the indicated device_node - * @dn: device node for which to set up EEH - * - * This routine must be used to perform EEH initialization for PCI - * devices that were added after system boot (e.g. hotplug, dlpar). - * This routine must be called before any i/o is performed to the - * adapter (inluding any config-space i/o). - * Whether this actually enables EEH or not for this device depends - * on the CEC architecture, type of the device, on earlier boot - * command-line arguments & etc. - */ -void eeh_add_device_early(struct device_node *dn) -{ - struct pci_controller *phb; - struct eeh_early_enable_info info; - - if (!dn || !PCI_DN(dn)) - return; - phb = PCI_DN(dn)->phb; - if (NULL == phb || 0 == phb->buid) { - printk(KERN_WARNING "EEH: Expected buid but found none for %s\n", - dn->full_name); - dump_stack(); - return; - } - - info.buid_hi = BUID_HI(phb->buid); - info.buid_lo = BUID_LO(phb->buid); - early_enable_eeh(dn, &info); -} -EXPORT_SYMBOL_GPL(eeh_add_device_early); - -/** - * eeh_add_device_late - perform EEH initialization for the indicated pci device - * @dev: pci device for which to set up EEH - * - * This routine must be used to complete EEH initialization for PCI - * devices that were added after system boot (e.g. hotplug, dlpar). - */ -void eeh_add_device_late(struct pci_dev *dev) -{ - struct device_node *dn; - - if (!dev || !eeh_subsystem_enabled) - return; - -#ifdef DEBUG - printk(KERN_DEBUG "EEH: adding device %s\n", pci_name(dev)); -#endif - - pci_dev_get (dev); - dn = pci_device_to_OF_node(dev); - PCI_DN(dn)->pcidev = dev; - - pci_addr_cache_insert_device (dev); -} -EXPORT_SYMBOL_GPL(eeh_add_device_late); - -/** - * eeh_remove_device - undo EEH setup for the indicated pci device - * @dev: pci device to be removed - * - * This routine should be when a device is removed from a running - * system (e.g. by hotplug or dlpar). - */ -void eeh_remove_device(struct pci_dev *dev) -{ - struct device_node *dn; - if (!dev || !eeh_subsystem_enabled) - return; - - /* Unregister the device with the EEH/PCI address search system */ -#ifdef DEBUG - printk(KERN_DEBUG "EEH: remove device %s\n", pci_name(dev)); -#endif - pci_addr_cache_remove_device(dev); - - dn = pci_device_to_OF_node(dev); - PCI_DN(dn)->pcidev = NULL; - pci_dev_put (dev); -} -EXPORT_SYMBOL_GPL(eeh_remove_device); - -static int proc_eeh_show(struct seq_file *m, void *v) -{ - unsigned int cpu; - unsigned long ffs = 0, positives = 0, failures = 0; - unsigned long resets = 0; - unsigned long no_dev = 0, no_dn = 0, no_cfg = 0, no_check = 0; - - for_each_cpu(cpu) { - ffs += per_cpu(total_mmio_ffs, cpu); - positives += per_cpu(false_positives, cpu); - failures += per_cpu(ignored_failures, cpu); - resets += per_cpu(slot_resets, cpu); - no_dev += per_cpu(no_device, cpu); - no_dn += per_cpu(no_dn, cpu); - no_cfg += per_cpu(no_cfg_addr, cpu); - no_check += per_cpu(ignored_check, cpu); - } - - if (0 == eeh_subsystem_enabled) { - seq_printf(m, "EEH Subsystem is globally disabled\n"); - seq_printf(m, "eeh_total_mmio_ffs=%ld\n", ffs); - } else { - seq_printf(m, "EEH Subsystem is enabled\n"); - seq_printf(m, - "no device=%ld\n" - "no device node=%ld\n" - "no config address=%ld\n" - "check not wanted=%ld\n" - "eeh_total_mmio_ffs=%ld\n" - "eeh_false_positives=%ld\n" - "eeh_ignored_failures=%ld\n" - "eeh_slot_resets=%ld\n", - no_dev, no_dn, no_cfg, no_check, - ffs, positives, failures, resets); - } - - return 0; -} - -static int proc_eeh_open(struct inode *inode, struct file *file) -{ - return single_open(file, proc_eeh_show, NULL); -} - -static struct file_operations proc_eeh_operations = { - .open = proc_eeh_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - -static int __init eeh_init_proc(void) -{ - struct proc_dir_entry *e; - - if (systemcfg->platform & PLATFORM_PSERIES) { - e = create_proc_entry("ppc64/eeh", 0, NULL); - if (e) - e->proc_fops = &proc_eeh_operations; - } - - return 0; -} -__initcall(eeh_init_proc); -- cgit v1.2.3