linux-kernel - Re: [mpt3sas driver 06/10] mpt3sas: Added smp_affinity

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Date:	Mon, 8 Feb 2016 11:31:22 +0530
From:	Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>
To:	Tomas Henzl <thenzl@...hat.com>
Cc:	Suganath prabu Subaramani 
	<suganath-prabu.subramani@...gotech.com>, JBottomley@...allels.com,
	jejb@...nel.org, Christoph Hellwig <hch@...radead.org>,
	martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
	Sathya Prakash <Sathya.Prakash@...gotech.com>,
	Kashyap Desai <kashyap.desai@...gotech.com>,
	Krishnaraddi Mankani <krishnaraddi.mankani@...gotech.com>,
	linux-kernel@...r.kernel.org,
	Chaitra Basappa <chaitra.basappa@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>
Subject: Re: [mpt3sas driver 06/10] mpt3sas: Added smp_affinity_enable module parameter.

Hi Tomas,
Initially, we posted this patch with "zalloc_cpumassk_var" and Robert
has suggested to use "alloc_cpumask_var". Please check the below link.
"http://www.gossamer-threads.com/lists/linux/kernel/2068280?do=post_view_threaded#2068280"

We incorporated other review comments for freeing reply_q and
cpumask_var in this patch and sending it soon.

Thanks,
Suganath prabu S

On Thu, Feb 4, 2016 at 8:31 PM, Tomas Henzl <thenzl@...hat.com> wrote:
> On 28.1.2016 07:37, Suganath prabu Subaramani wrote:
>> From: Suganath prabu Subramani <suganath-prabu.subramani@...gotech.com>
>>
>> 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@...gotech.com>
>> Signed-off-by: Chaitra P B <chaitra.basappa@...gotech.com>
>> ---
>>  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))
>
> a kfree(reply_q); should go here
>
>> +                     return -ENOMEM;
>> +             cpumask_clear(reply_q->affinity_hint);
>
> maybe zalloc_cpumask_var ?
>
>> +     }
>
>         if (r) {
>                 pr_err(MPT3SAS_FMT "unable to allocate interrupt %d!\n",
>                     reply_q->name, vector);
>                 kfree(reply_q);
> and a  free_cpumask_var (..)  here ?
>                 return -EBUSY;
>
>
> cheers,
> tomash
>