[PATCH] PPC64: EEH Recovery
From: Linas Vepstas
Date: Thu Jan 06 2005 - 15:39:35 EST
Hi Paul,
The patch below implements hotplug style EEH error recovery.
Its split into two pieces: a part that needs to be applied to the
PPC64 arch tree, and a part that needs to be applied to the
RPA PHP hotplug tree. The PPC64 part needs to go in first.
Assuming this doesn't generate a round of discussion, please
forward upstream to akpm/torvalds.
Signed-off-by: Linas Vepstas <linas@xxxxxxxxx>
===== arch/ppc64/kernel/eeh.c 1.41 vs edited =====
--- 1.41/arch/ppc64/kernel/eeh.c 2005-01-06 13:05:42 -06:00
+++ edited/arch/ppc64/kernel/eeh.c 2005-01-06 13:08:03 -06:00
@@ -17,21 +17,19 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
-#include <linux/bootmem.h>
+#include <linux/delay.h>
#include <linux/init.h>
#include <linux/list.h>
-#include <linux/mm.h>
#include <linux/notifier.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/rbtree.h>
#include <linux/seq_file.h>
-#include <linux/spinlock.h>
+#include <asm/atomic.h>
#include <asm/eeh.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/rtas.h>
-#include <asm/atomic.h>
#include "pci.h"
#undef DEBUG
@@ -89,7 +87,6 @@ static struct notifier_block *eeh_notifi
* attempts we allow before panicking.
*/
#define EEH_MAX_FAILS 1000
-static atomic_t eeh_fail_count;
/* RTAS tokens */
static int ibm_set_eeh_option;
@@ -106,6 +103,10 @@ static spinlock_t slot_errbuf_lock = SPI
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);
@@ -224,9 +225,9 @@ pci_addr_cache_insert(struct pci_dev *de
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 ||
@@ -244,6 +245,11 @@ pci_addr_cache_insert(struct pci_dev *de
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);
@@ -368,6 +374,7 @@ void pci_addr_cache_remove_device(struct
*/
void __init pci_addr_cache_build(void)
{
+ struct device_node *dn;
struct pci_dev *dev = NULL;
spin_lock_init(&pci_io_addr_cache_root.piar_lock);
@@ -378,6 +385,14 @@ void __init pci_addr_cache_build(void)
continue;
}
pci_addr_cache_insert_device(dev);
+
+ /* Save the BAR's; firmware doesn't restore these after EEH reset */
+ dn = pci_device_to_OF_node(dev);
+ if (dn) {
+ int i;
+ for (i = 0; i < 16; i++)
+ pci_read_config_dword(dev, i * 4, &dn->config_space[i]);
+ }
}
#ifdef DEBUG
@@ -389,6 +404,32 @@ 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 device_node *dn, int severity)
+{
+ unsigned long flags;
+ int rc;
+
+ if (!dn) return;
+
+ /* 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, dn->eeh_config_addr,
+ BUID_HI(dn->phb->buid),
+ BUID_LO(dn->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);
+}
+
+EXPORT_SYMBOL(eeh_slot_error_detail);
+
/**
* eeh_register_notifier - Register to find out about EEH events.
* @nb: notifier block to callback on events
@@ -484,11 +525,9 @@ static void eeh_event_handler(void *dumm
"%s %s\n", event->reset_state,
pci_name(event->dev), pci_pretty_name(event->dev));
- atomic_set(&eeh_fail_count, 0);
- notifier_call_chain (&eeh_notifier_chain,
- EEH_NOTIFY_FREEZE, event);
-
__get_cpu_var(slot_resets)++;
+ notifier_call_chain (&eeh_notifier_chain,
+ EEH_NOTIFY_FREEZE, event);
pci_dev_put(event->dev);
kfree(event);
@@ -496,8 +535,8 @@ static void eeh_event_handler(void *dumm
}
/**
- * eeh_token_to_phys - convert EEH address token to phys address
- * @token i/o token, should be address in the form 0xE....
+ * eeh_token_to_phys - convert I/O address to phys address
+ * @token i/o address, should be address in the form 0xA....
*/
static inline unsigned long eeh_token_to_phys(unsigned long token)
{
@@ -512,6 +551,17 @@ static inline unsigned long eeh_token_to
return pa | (token & (PAGE_SIZE-1));
}
+static inline struct pci_dev * eeh_get_pci_dev(struct device_node *dn)
+{
+ struct pci_dev *dev = NULL;
+
+ for_each_pci_dev(dev) {
+ if (pci_device_to_OF_node(dev) == dn)
+ return dev;
+ }
+ return NULL;
+}
+
/**
* eeh_dn_check_failure - check if all 1's data is due to EEH slot freeze
* @dn device node
@@ -532,7 +582,7 @@ int eeh_dn_check_failure(struct device_n
int ret;
int rets[3];
unsigned long flags;
- int rc, reset_state;
+ int reset_state;
struct eeh_event *event;
__get_cpu_var(total_mmio_ffs)++;
@@ -540,16 +590,20 @@ int eeh_dn_check_failure(struct device_n
if (!eeh_subsystem_enabled)
return 0;
- if (!dn)
+ if (!dn) {
+ __get_cpu_var(no_dn)++;
return 0;
+ }
/* Access to IO BARs might get this far and still not want checking. */
if (!(dn->eeh_mode & EEH_MODE_SUPPORTED) ||
dn->eeh_mode & EEH_MODE_NOCHECK) {
+ __get_cpu_var(ignored_check)++;
return 0;
}
if (!dn->eeh_config_addr) {
+ __get_cpu_var(no_cfg_addr)++;
return 0;
}
@@ -558,8 +612,9 @@ int eeh_dn_check_failure(struct device_n
* slot, we know it's bad already, we don't need to check...
*/
if (dn->eeh_mode & EEH_MODE_ISOLATED) {
- atomic_inc(&eeh_fail_count);
- if (atomic_read(&eeh_fail_count) >= EEH_MAX_FAILS) {
+ dn->eeh_freeze_count ++;
+ if (dn->eeh_freeze_count >= EEH_MAX_FAILS) {
+ dump_stack();
/* re-read the slot reset state */
if (read_slot_reset_state(dn, rets) != 0)
rets[0] = -1; /* reset state unknown */
@@ -581,34 +636,25 @@ int eeh_dn_check_failure(struct device_n
return 0;
}
- /* prevent repeated reports of this failure */
+ /* Prevent repeated reports of this failure */
dn->eeh_mode |= EEH_MODE_ISOLATED;
reset_state = rets[0];
+ /* Log the error with the rtas logger */
+ if (dn->eeh_freeze_count < EEH_MAX_ALLOWED_FREEZES) {
+ eeh_slot_error_detail (dn, 1 /* Temporary Error */);
+ } else {
+ eeh_slot_error_detail (dn, 2 /* Permanent Error */);
+ }
- 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, dn->eeh_config_addr,
- BUID_HI(dn->phb->buid),
- BUID_LO(dn->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);
-
- 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);
+ printk (KERN_ERR "EEH: out of memory, event not handled\n");
return 1;
}
+ if (!dev)
+ dev = eeh_get_pci_dev (dn);
event->dev = dev;
event->dn = dn;
event->reset_state = reset_state;
@@ -634,7 +680,6 @@ 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
@@ -642,6 +687,7 @@ EXPORT_SYMBOL(eeh_dn_check_failure);
*
* 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;
@@ -651,8 +697,10 @@ unsigned long eeh_check_failure(const vo
/* 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);
@@ -663,6 +711,172 @@ unsigned long eeh_check_failure(const vo
EXPORT_SYMBOL(eeh_check_failure);
+/* ------------------------------------------------------------- */
+/* The code below deals with error recovery */
+
+void
+rtas_set_slot_reset(struct device_node *dn)
+{
+ int token = rtas_token ("ibm,set-slot-reset");
+ int rc;
+
+ if (token == RTAS_UNKNOWN_SERVICE)
+ return;
+ rc = rtas_call(token,4,1, NULL,
+ dn->eeh_config_addr,
+ BUID_HI(dn->phb->buid),
+ BUID_LO(dn->phb->buid),
+ 1);
+ if (rc) {
+ printk (KERN_WARNING "EEH: Unable to reset the failed slot\n");
+ return;
+ }
+
+ /* The PCI bus requires that the reset be held high for at least
+ * a 100 milliseconds. We wait a bit longer 'just in case'.
+ */
+ msleep (200);
+
+ rc = rtas_call(token,4,1, NULL,
+ dn->eeh_config_addr,
+ BUID_HI(dn->phb->buid),
+ BUID_LO(dn->phb->buid),
+ 0);
+}
+
+EXPORT_SYMBOL(rtas_set_slot_reset);
+
+void
+rtas_configure_bridge(struct device_node *dn)
+{
+ int token = rtas_token ("ibm,configure-bridge");
+ int rc;
+
+ if (token == RTAS_UNKNOWN_SERVICE)
+ return;
+ rc = rtas_call(token,3,1, NULL,
+ dn->eeh_config_addr,
+ BUID_HI(dn->phb->buid),
+ BUID_LO(dn->phb->buid));
+ if (rc) {
+ printk (KERN_WARNING "EEH: Unable to configure device bridge\n");
+ }
+}
+
+EXPORT_SYMBOL(rtas_configure_bridge);
+
+/* ------------------------------------------------------- */
+/** Save and restore of PCI BARs
+ *
+ * Although firmware will set up BARs during boot, it doesn't
+ * set up device BAR's after a device reset, although it will,
+ * if requested, set up bridge configuration. Thus, we need to
+ * configure the PCI devices ourselves. Config-space setup is
+ * stored in the PCI structures which are normally deleted during
+ * device removal. Thus, the "save" routine references the
+ * structures so that they aren't deleted.
+ */
+
+
+struct eeh_cfg_tree
+{
+ struct eeh_cfg_tree *sibling;
+ struct eeh_cfg_tree *child;
+ struct device_node *dn;
+ int is_bridge;
+};
+
+/**
+ * eeh_save_bars - save the PCI config space info
+ */
+struct eeh_cfg_tree * eeh_save_bars(struct device_node *dn)
+{
+ struct pci_dev *dev;
+ struct eeh_cfg_tree *cnode;
+
+ dev = eeh_get_pci_dev(dn);
+ if (!dev)
+ return NULL;
+
+ cnode = kmalloc(sizeof(struct eeh_cfg_tree), GFP_KERNEL);
+ if (!cnode)
+ return NULL;
+
+ cnode->is_bridge = 0;
+
+ if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
+ cnode->is_bridge = 1;
+
+ of_node_get(dn);
+ cnode->dn = dn;
+
+ cnode->sibling = NULL;
+ cnode->child = NULL;
+
+ if (dn->child) {
+ cnode->child = eeh_save_bars (dn->child);
+ }
+ if (dn->sibling) {
+ cnode->sibling = eeh_save_bars (dn->sibling);
+ }
+
+ return cnode;
+}
+EXPORT_SYMBOL(eeh_save_bars);
+
+/**
+ * __restore_bars - Restore the Base Address Registers
+ * Loads the PCI configuration space base address registers,
+ * the expansion ROM base address, the latency timer, and etc.
+ * from the saved values in the device node.
+ */
+static inline void __restore_bars (struct device_node *dn)
+{
+ int i;
+ for (i=4; i<10; i++) {
+ rtas_write_config(dn, i*4, 4, dn->config_space[i]);
+ }
+
+ /* 12 == Expansion ROM Address */
+ rtas_write_config(dn, 12*4, 4, dn->config_space[12]);
+
+#define SAVED_BYTE(OFF) (((u8 *)(dn->config_space))[OFF])
+
+ rtas_write_config (dn, PCI_CACHE_LINE_SIZE, 1,
+ SAVED_BYTE(PCI_CACHE_LINE_SIZE));
+
+ rtas_write_config (dn, PCI_LATENCY_TIMER, 1,
+ SAVED_BYTE(PCI_LATENCY_TIMER));
+
+ rtas_write_config (dn, PCI_INTERRUPT_LINE, 1,
+ SAVED_BYTE(PCI_INTERRUPT_LINE));
+}
+
+/**
+ * eeh_restore_bars - restore the PCI config space info
+ */
+void eeh_restore_bars(struct eeh_cfg_tree *tree)
+{
+ if (!(tree->is_bridge))
+ __restore_bars (tree->dn);
+
+ if (tree->child)
+ eeh_restore_bars (tree->child);
+
+ if (tree->sibling)
+ eeh_restore_bars (tree->sibling);
+
+ of_node_put (tree->dn);
+ kfree (tree);
+}
+EXPORT_SYMBOL(eeh_restore_bars);
+
+/* ------------------------------------------------------------- */
+/* The code below deals with enabling EEH for devices during the
+ * early boot sequence. EEH must be enabled before any PCI probing
+ * can be done.
+ */
+
struct eeh_early_enable_info {
unsigned int buid_hi;
unsigned int buid_lo;
@@ -829,7 +1043,9 @@ void eeh_add_device_early(struct device_
return;
phb = 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;
}
@@ -848,6 +1064,9 @@ EXPORT_SYMBOL(eeh_add_device_early);
*/
void eeh_add_device_late(struct pci_dev *dev)
{
+ int i;
+ struct device_node *dn;
+
if (!dev || !eeh_subsystem_enabled)
return;
@@ -857,6 +1076,11 @@ void eeh_add_device_late(struct pci_dev
#endif
pci_addr_cache_insert_device (dev);
+
+ /* Save the BAR's; firmware doesn't restore these after EEH reset */
+ dn = pci_device_to_OF_node(dev);
+ for (i = 0; i < 16; i++)
+ pci_read_config_dword(dev, i * 4, &dn->config_space[i]);
}
EXPORT_SYMBOL(eeh_add_device_late);
@@ -886,12 +1110,17 @@ static int proc_eeh_show(struct seq_file
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) {
@@ -899,13 +1128,17 @@ static int proc_eeh_show(struct seq_file
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"
+ 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"
- "eeh_fail_count=%d\n",
- ffs, positives, failures, resets,
- eeh_fail_count.counter);
+ "eeh_slot_resets=%ld\n",
+ no_dev, no_dn, no_cfg, no_check,
+ ffs, positives, failures, resets);
}
return 0;
===== arch/ppc64/kernel/pSeries_pci.c 1.59 vs edited =====
--- 1.59/arch/ppc64/kernel/pSeries_pci.c 2004-11-15 21:29:10 -06:00
+++ edited/arch/ppc64/kernel/pSeries_pci.c 2005-01-05 13:41:09 -06:00
@@ -102,7 +102,7 @@ static int rtas_pci_read_config(struct p
return PCIBIOS_DEVICE_NOT_FOUND;
}
-static int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
+int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
{
unsigned long buid, addr;
int ret;
===== include/asm-ppc64/eeh.h 1.23 vs edited =====
--- 1.23/include/asm-ppc64/eeh.h 2004-10-25 18:17:38 -05:00
+++ edited/include/asm-ppc64/eeh.h 2005-01-05 13:47:55 -06:00
@@ -22,8 +22,8 @@
#include <linux/init.h>
#include <linux/list.h>
-#include <linux/string.h>
#include <linux/notifier.h>
+#include <linux/string.h>
struct pci_dev;
struct device_node;
@@ -33,6 +33,10 @@ struct device_node;
#define EEH_MODE_NOCHECK (1<<1)
#define EEH_MODE_ISOLATED (1<<2)
+/* Max number of EEH freezes allowed before we consider the device
+ * to be permanently disabled. */
+#define EEH_MAX_ALLOWED_FREEZES 5
+
#ifdef CONFIG_PPC_PSERIES
extern void __init eeh_init(void);
unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val);
@@ -57,6 +61,34 @@ void eeh_add_device_early(struct device_
void eeh_add_device_late(struct pci_dev *);
/**
+ * eeh_slot_error_detail -- record and EEH error condition to the log
+ * @severity: 1 if temporary, 2 if permanent failure.
+ *
+ * Obtains the the EEH error details from the RTAS subsystem,
+ * and then logs these details with the RTAS error log system.
+ */
+void eeh_slot_error_detail (struct device_node *dn, int severity);
+
+/**
+ * rtas_set_slot_reset -- unfreeze a frozen slot
+ *
+ * Clear the EEH-frozen condition on a slot. This routine
+ * does this by asserting the PCI #RST line for 1/8th of
+ * a second; this routine will sleep while the adapter is
+ * being reset.
+ */
+void rtas_set_slot_reset (struct device_node *dn);
+
+/**
+ * rtas_configure_bridge -- firmware initialization of pci bridge
+ *
+ * Ask the firmware to configure any PCI bridge devices
+ * located behind the indicated node. Required after a
+ * pci device reset.
+ */
+void rtas_configure_bridge(struct device_node *dn);
+
+/**
* eeh_remove_device - undo EEH setup for the indicated pci device
* @dev: pci device to be removed
*
@@ -91,6 +123,13 @@ struct eeh_event {
/** Register to find out about EEH events. */
int eeh_register_notifier(struct notifier_block *nb);
int eeh_unregister_notifier(struct notifier_block *nb);
+
+/** Save and restore device configuration info across
+ * device resets.
+ */
+struct eeh_cfg_tree;
+struct eeh_cfg_tree * eeh_save_bars(struct device_node *dn);
+void eeh_restore_bars(struct eeh_cfg_tree *tree);
/**
* EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
===== include/asm-ppc64/prom.h 1.24 vs edited =====
--- 1.24/include/asm-ppc64/prom.h 2004-11-25 00:42:42 -06:00
+++ edited/include/asm-ppc64/prom.h 2005-01-05 13:41:09 -06:00
@@ -164,8 +164,10 @@ struct device_node {
int status; /* Current device status (non-zero is bad) */
int eeh_mode; /* See eeh.h for possible EEH_MODEs */
int eeh_config_addr;
+ int eeh_freeze_count; /* number of times this device froze up. */
struct pci_controller *phb; /* for pci devices */
struct iommu_table *iommu_table; /* for phb's or bridges */
+ u32 config_space[16]; /* saved PCI config space */
struct property *properties;
struct device_node *parent;
===== include/asm-ppc64/rtas.h 1.25 vs edited =====
--- 1.25/include/asm-ppc64/rtas.h 2004-11-25 00:42:42 -06:00
+++ edited/include/asm-ppc64/rtas.h 2005-01-05 13:41:09 -06:00
@@ -241,4 +241,6 @@ extern void rtas_stop_self(void);
/* RMO buffer reserved for user-space RTAS use */
extern unsigned long rtas_rmo_buf;
+extern int rtas_write_config(struct device_node *dn, int where, int size, u32 val);
+
#endif /* _PPC64_RTAS_H */
===== drivers/pci/hotplug/rpaphp.h 1.11 vs edited =====
--- 1.11/drivers/pci/hotplug/rpaphp.h 2004-10-06 11:43:44 -05:00
+++ edited/drivers/pci/hotplug/rpaphp.h 2005-01-05 13:41:09 -06:00
@@ -126,6 +126,8 @@ extern int register_pci_slot(struct slot
extern int rpaphp_unconfig_pci_adapter(struct slot *slot);
extern int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value);
extern struct hotplug_slot *rpaphp_find_hotplug_slot(struct pci_dev *dev);
+extern void init_eeh_handler (void);
+extern void exit_eeh_handler (void);
/* rpaphp_core.c */
extern int rpaphp_add_slot(struct device_node *dn);
===== drivers/pci/hotplug/rpaphp_core.c 1.18 vs edited =====
--- 1.18/drivers/pci/hotplug/rpaphp_core.c 2004-10-06 11:43:44 -05:00
+++ edited/drivers/pci/hotplug/rpaphp_core.c 2005-01-05 13:41:09 -06:00
@@ -443,12 +443,18 @@ static int __init rpaphp_init(void)
{
info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
+ /* Get set to handle EEH events. */
+ init_eeh_handler();
+
/* read all the PRA info from the system */
return init_rpa();
}
static void __exit rpaphp_exit(void)
{
+ /* Let EEH know we are going away. */
+ exit_eeh_handler();
+
cleanup_slots();
}
===== drivers/pci/hotplug/rpaphp_pci.c 1.17 vs edited =====
--- 1.17/drivers/pci/hotplug/rpaphp_pci.c 2004-11-18 02:36:18 -06:00
+++ edited/drivers/pci/hotplug/rpaphp_pci.c 2005-01-05 15:30:29 -06:00
@@ -22,8 +22,12 @@
* Send feedback to <lxie@xxxxxxxxxx>
*
*/
+#include <linux/delay.h>
+#include <linux/notifier.h>
#include <linux/pci.h>
+#include <asm/eeh.h>
#include <asm/pci-bridge.h>
+#include <asm/prom.h>
#include <asm/rtas.h>
#include "../pci.h" /* for pci_add_new_bus */
@@ -62,6 +66,7 @@ int rpaphp_claim_resource(struct pci_dev
root ? "Address space collision on" :
"No parent found for",
resource, dtype, pci_name(dev), res->start, res->end);
+ dump_stack();
}
return err;
}
@@ -184,6 +189,19 @@ rpaphp_fixup_new_pci_devices(struct pci_
static int rpaphp_pci_config_bridge(struct pci_dev *dev);
+static void rpaphp_eeh_add_bus_device(struct pci_bus *bus)
+{
+ struct pci_dev *dev;
+ list_for_each_entry(dev, &bus->devices, bus_list) {
+ eeh_add_device_late(dev);
+ if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
+ struct pci_bus *subbus = dev->subordinate;
+ if (bus)
+ rpaphp_eeh_add_bus_device (subbus);
+ }
+ }
+}
+
/*****************************************************************************
rpaphp_pci_config_slot() will configure all devices under the
given slot->dn and return the the first pci_dev.
@@ -211,6 +229,8 @@ rpaphp_pci_config_slot(struct device_nod
}
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
rpaphp_pci_config_bridge(dev);
+
+ rpaphp_eeh_add_bus_device(bus);
}
return dev;
}
@@ -219,7 +239,6 @@ static int rpaphp_pci_config_bridge(stru
{
u8 sec_busno;
struct pci_bus *child_bus;
- struct pci_dev *child_dev;
dbg("Enter %s: BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
@@ -236,11 +255,7 @@ static int rpaphp_pci_config_bridge(stru
/* do pci_scan_child_bus */
pci_scan_child_bus(child_bus);
- list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
- eeh_add_device_late(child_dev);
- }
-
- /* fixup new pci devices without touching bus struct */
+ /* Fixup new pci devices without touching bus struct */
rpaphp_fixup_new_pci_devices(child_bus, 0);
/* Make the discovered devices available */
@@ -278,7 +293,7 @@ static void print_slot_pci_funcs(struct
return;
}
#else
-static void print_slot_pci_funcs(struct slot *slot)
+static inline void print_slot_pci_funcs(struct slot *slot)
{
return;
}
@@ -360,7 +375,6 @@ static void rpaphp_eeh_remove_bus_device
if (pdev)
rpaphp_eeh_remove_bus_device(pdev);
}
-
}
return;
}
@@ -562,36 +576,154 @@ exit:
return retval;
}
-struct hotplug_slot *rpaphp_find_hotplug_slot(struct pci_dev *dev)
+/**
+ * rpaphp_find_slot - find and return the slot holding the device
+ * @dev: pci device for which we want the slot structure.
+ */
+static struct slot *rpaphp_find_slot(struct pci_dev *dev)
{
- struct list_head *tmp, *n;
- struct slot *slot;
+ struct list_head *tmp, *n;
+ struct slot *slot;
list_for_each_safe(tmp, n, &rpaphp_slot_head) {
struct pci_bus *bus;
struct list_head *ln;
slot = list_entry(tmp, struct slot, rpaphp_slot_list);
- if (slot->bridge == NULL) {
- if (slot->dev_type == PCI_DEV) {
- printk(KERN_WARNING "PCI slot missing bridge %s %s \n",
- slot->name, slot->location);
- }
+
+ /* PHB slots don't have bridges */
+ if (slot->bridge == NULL)
continue;
- }
+
+ /* the PCI device could be the PHB itself */
+ if (slot->bridge == dev)
+ return slot;
bus = slot->bridge->subordinate;
if (!bus) {
+ printk (KERN_WARNING "PCI bridge is missing bus: %s %s\n",
+ pci_name (slot->bridge), pci_pretty_name (slot->bridge));
continue; /* should never happen? */
}
+
for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
- struct pci_dev *pdev = pci_dev_b(ln);
- if (pdev == dev)
- return slot->hotplug_slot;
+ struct pci_dev *pdev = pci_dev_b(ln);
+ if (pdev == dev)
+ return slot;
}
}
return NULL;
}
-EXPORT_SYMBOL_GPL(rpaphp_find_hotplug_slot);
+/* ------------------------------------------------------- */
+/**
+ * handle_eeh_events -- reset a PCI device after hard lockup.
+ *
+ * pSeries systems will isolate a PCI slot if the PCI-Host
+ * bridge detects address or data parity errors, DMA's
+ * occuring to wild addresses (which usually happen due to
+ * bugs in device drivers or in PCI adapter firmware).
+ * Slot isolations also occur if #SERR, #PERR or other misc
+ * PCI-related errors are detected.
+ *
+ * Recovery process consists of unplugging the device driver
+ * (which generated hotplug events to userspace), then issuing
+ * a PCI #RST to the device, then reconfiguring the PCI config
+ * space for all bridges & devices under this slot, and then
+ * finally restarting the device drivers (which cause a second
+ * set of hotplug events to go out to userspace).
+ */
+int handle_eeh_events (struct notifier_block *self,
+ unsigned long reason, void *ev)
+{
+ int freeze_count=0;
+ struct eeh_event *event = ev;
+ struct slot *frozen_slot;
+ struct eeh_cfg_tree * saved_bars;
+
+debug=1;
+ frozen_slot = rpaphp_find_slot(event->dev);
+ if (!frozen_slot)
+ {
+ printk (KERN_ERR
+ "EEH: Cannot find PCI slot for EEH error! dev=%p dn=%p\n",
+ event->dev, event->dn);
+ if (event->dev)
+ printk("EEH: above message for pci device %s %s\n",
+ pci_name(event->dev), pci_pretty_name (event->dev));
+ if (event->dn)
+ printk ("EEH: above message for dn %s\n", event->dn->full_name);
+ return 1;
+ }
+
+ /* Keep a copy of the config space registers */
+ saved_bars = eeh_save_bars(frozen_slot->dn);
+ of_node_get(event->dn);
+ pci_dev_get(event->dev);
+
+ if (frozen_slot->dn->child)
+ freeze_count = frozen_slot->dn->child->eeh_freeze_count;
+ rpaphp_unconfig_pci_adapter (frozen_slot);
+
+ freeze_count ++;
+ if (freeze_count > EEH_MAX_ALLOWED_FREEZES) {
+ /*
+ * About 90% of all real-life EEH failures in the field
+ * are due to poorly seated PCI cards. Only 10% or so are
+ * due to actual, failed cards
+ */
+ printk (KERN_ERR
+ "EEH: device %s:%s has failed %d times \n"
+ "and has been permanently disabled. Please try reseating\n"
+ "this device or replacing it.\n",
+ pci_name (event->dev),
+ pci_pretty_name (event->dev),
+ freeze_count);
+ goto rdone;
+ }
+ printk (KERN_WARNING
+ "EEH: This device has failed %d times since last reoobt: %s:%s\n",
+ freeze_count,
+ pci_name (event->dev),
+ pci_pretty_name (event->dev));
+
+ /* Reset the pci controller. (Asserts RST#; resets config space).
+ * Reconfigure bridges and devices */
+ rtas_set_slot_reset (event->dn);
+ rtas_configure_bridge(event->dn);
+ eeh_restore_bars(saved_bars);
+
+ /* Give the system 5 seconds to finish running the user-space
+ * hotplug scripts, e.g. ifdown for ethernet. Yes, this is a hack,
+ * but if we don't do this, weird things happen.
+ */
+ ssleep (5);
+
+ rpaphp_enable_pci_slot (frozen_slot);
+
+ /* Store the freeze count with the pci adapter, and not the slot.
+ * This way, if the device is replaced, the count is cleared.
+ */
+ if (frozen_slot->dn->child)
+ frozen_slot->dn->child->eeh_freeze_count = freeze_count;
+
+rdone:
+ of_node_put(event->dn);
+ pci_dev_put(event->dev);
+ return 0;
+}
+
+static struct notifier_block eeh_block;
+
+void __init init_eeh_handler (void)
+{
+ eeh_block.notifier_call = handle_eeh_events;
+ eeh_register_notifier (&eeh_block);
+}
+
+void __exit exit_eeh_handler (void)
+{
+ eeh_unregister_notifier (&eeh_block);
+}
+