From: Suganath prabu Subramani <suganath-prabu.subramani@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Chaitra P B <chaitra.basappa@xxxxxxxxxxxxx>
---
drivers/scsi/mpt3sas/mpt3sas_base.c | 34 +++++++++++++++++++++++-----------
1 file changed, 23 insertions(+), 11 deletions(-)
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index 31838d9a..a1a3b39 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -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);
- irq_set_affinity_hint(reply_q->vector, NULL);
- free_cpumask_var(reply_q->affinity_hint);
+ 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 +1850,11 @@ _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))
- return -ENOMEM;
- cpumask_clear(reply_q->affinity_hint);
+ if (smp_affinity_enable) {
+ if (!alloc_cpumask_var(&reply_q->affinity_hint, GFP_KERNEL))
+ return -ENOMEM;
+ cpumask_clear(reply_q->affinity_hint);
+ }
atomic_set(&reply_q->busy, 0);
if (ioc->msix_enable)
@@ -1909,16 +1917,17 @@ _base_assign_reply_queues(struct MPT3SAS_ADAPTER *ioc)
for (i = 0 ; i < group ; i++) {
ioc->cpu_msix_table[cpu] = index;
- cpumask_or(reply_q->affinity_hint,
+ 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 (irq_set_affinity_hint(reply_q->vector,
+ 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",
- ioc->name, reply_q->vector));
+ dinitprintk(ioc, pr_info(MPT3SAS_FMT
+ "Err setting affinity hint to irq vector %d\n",
+ ioc->name, reply_q->vector));
index++;
}
}
@@ -1976,6 +1985,9 @@ _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) {
--
1.8.3.1
--
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