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mpt3sas: Added smp_affinity_enable module parameter. 

Module parameter to enable/disable configuring affinity hint for msix
vector.  SMP affinity feature can be enabled/disabled by setting module
parameter "smp_affinity_enable" to 1/0.  By default this feature is
enabled. (smp_affinity_enable = 1 enabled).

Signed-off-by: Suganath prabu Subramani <suganath-prabu.subramani@avagotech.com>
Signed-off-by: Chaitra P B <chaitra.basappa@avagotech.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Suganath Prabu Subramani 2016-02-08 22:13:39 +05:30 committed by Martin K. Petersen
parent fd0331b328
commit 64038301ba
1 changed files with 26 additions and 11 deletions
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21
drivers/scsi/mpt3sas/mpt3sas_base.c
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@ -83,6 +83,10 @@ static int msix_disable = -1;
module_param(msix_disable, int, 0);
MODULE_PARM_DESC(msix_disable, " disable msix routed interrupts (default=0)");
static int smp_affinity_enable = 1;
module_param(smp_affinity_enable, int, S_IRUGO);
MODULE_PARM_DESC(smp_affinity_enable, "SMP affinity feature enable/disbale Default: enable(1)");
static int max_msix_vectors = -1;
module_param(max_msix_vectors, int, 0);
MODULE_PARM_DESC(max_msix_vectors,
@ -1812,8 +1816,10 @@ _base_free_irq(struct MPT3SAS_ADAPTER *ioc)
list_for_each_entry_safe(reply_q, next, &ioc->reply_queue_list, list) {
list_del(&reply_q->list);
if (smp_affinity_enable) {
irq_set_affinity_hint(reply_q->vector, NULL);
free_cpumask_var(reply_q->affinity_hint);
}
synchronize_irq(reply_q->vector);
free_irq(reply_q->vector, reply_q);
kfree(reply_q);
@ -1844,9 +1850,13 @@ _base_request_irq(struct MPT3SAS_ADAPTER *ioc, u8 index, u32 vector)
reply_q->msix_index = index;
reply_q->vector = vector;
if (!alloc_cpumask_var(&reply_q->affinity_hint, GFP_KERNEL))
if (smp_affinity_enable) {
if (!zalloc_cpumask_var(&reply_q->affinity_hint, GFP_KERNEL)) {
kfree(reply_q);
return -ENOMEM;
}
cpumask_clear(reply_q->affinity_hint);
}
atomic_set(&reply_q->busy, 0);
if (ioc->msix_enable)
@ -1861,6 +1871,7 @@ _base_request_irq(struct MPT3SAS_ADAPTER *ioc, u8 index, u32 vector)
pr_err(MPT3SAS_FMT "unable to allocate interrupt %d!\n",
reply_q->name, vector);
kfree(reply_q);
free_cpumask_var(reply_q->affinity_hint);
return -EBUSY;
}
@ -1909,15 +1920,16 @@ _base_assign_reply_queues(struct MPT3SAS_ADAPTER *ioc)
for (i = 0 ; i < group ; i++) {
ioc->cpu_msix_table[cpu] = index;
if (smp_affinity_enable)
cpumask_or(reply_q->affinity_hint,
reply_q->affinity_hint, get_cpu_mask(cpu));
cpu = cpumask_next(cpu, cpu_online_mask);
}
if (smp_affinity_enable)
if (irq_set_affinity_hint(reply_q->vector,
reply_q->affinity_hint))
dinitprintk(ioc, pr_info(MPT3SAS_FMT
"error setting affinity hint for irq vector %d\n",
"Err setting affinity hint to irq vector %d\n",
ioc->name, reply_q->vector));
index++;
}
@ -1976,6 +1988,9 @@ _base_enable_msix(struct MPT3SAS_ADAPTER *ioc)
} else if (max_msix_vectors == 0)
goto try_ioapic;
if (ioc->msix_vector_count < ioc->cpu_count)
smp_affinity_enable = 0;
entries = kcalloc(ioc->reply_queue_count, sizeof(struct msix_entry),
GFP_KERNEL);
if (!entries) {