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[PATCH] powerpc: get rid of per_cpu EEH counters 

242-eeh-no-percpu-counters.patch

Remove per-cpu counters from the EEH code.  These statistics counters
are incremented at a very low frequency, and the performance gains of
per-cpu variables are negligable.  By contrast, the counters weren't
safe against cpu off/online operations, and its not worth the effort
to make them so (other than to turn them into plain globals).

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
(cherry picked from be3b5d1be053ccb41e91fa5a6f43ef5db301357d commit)
This commit is contained in:
Linas Vepstas 2005-11-03 18:55:25 -06:00 коммит произвёл Paul Mackerras
Родитель 7684b40cb5
Коммит 257ffc64a6
1 изменённых файлов: 23 добавлений и 37 удалений
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60
arch/powerpc/platforms/pseries/eeh.c
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@ -97,14 +97,14 @@ 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);
static unsigned long no_device;
static unsigned long no_dn;
static unsigned long no_cfg_addr;
static unsigned long ignored_check;
static unsigned long total_mmio_ffs;
static unsigned long false_positives;
static unsigned long ignored_failures;
static unsigned long slot_resets;
#define IS_BRIDGE(class_code) (((class_code)<<16) == PCI_BASE_CLASS_BRIDGE)
@ -288,13 +288,13 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
enum pci_channel_state state;
int rc = 0;
__get_cpu_var(total_mmio_ffs)++;
total_mmio_ffs++;
if (!eeh_subsystem_enabled)
return 0;
if (!dn) {
__get_cpu_var(no_dn)++;
no_dn++;
return 0;
}
pdn = PCI_DN(dn);
@ -302,7 +302,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
/* 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)++;
ignored_check++;
#ifdef DEBUG
printk ("EEH:ignored check (%x) for %s %s\n",
pdn->eeh_mode, pci_name (dev), dn->full_name);
@ -311,7 +311,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
}
if (!pdn->eeh_config_addr && !pdn->eeh_pe_config_addr) {
__get_cpu_var(no_cfg_addr)++;
no_cfg_addr++;
return 0;
}
@ -353,7 +353,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
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)++;
false_positives++;
rc = 0;
goto dn_unlock;
}
@ -362,14 +362,14 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
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)++;
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)++;
false_positives++;
rc = 0;
goto dn_unlock;
}
@ -377,12 +377,12 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
/* 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)++;
false_positives++;
rc = 0;
goto dn_unlock;
}
__get_cpu_var(slot_resets)++;
slot_resets++;
/* Avoid repeated reports of this failure, including problems
* with other functions on this device, and functions under
@ -432,7 +432,7 @@ unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned lon
addr = eeh_token_to_phys((unsigned long __force) token);
dev = pci_get_device_by_addr(addr);
if (!dev) {
__get_cpu_var(no_device)++;
no_device++;
return val;
}
@ -963,25 +963,9 @@ EXPORT_SYMBOL_GPL(eeh_remove_bus_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);
seq_printf(m, "eeh_total_mmio_ffs=%ld\n", total_mmio_ffs);
} else {
seq_printf(m, "EEH Subsystem is enabled\n");
seq_printf(m,
@ -993,8 +977,10 @@ static int proc_eeh_show(struct seq_file *m, void *v)
"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);
no_device, no_dn, no_cfg_addr,
ignored_check, total_mmio_ffs,
false_positives, ignored_failures,
slot_resets);
}
return 0;