From: adam radford <aradford@gmail.com>
To: linux-scsi <linux-scsi@vger.kernel.org>
Cc: Kashyap Desai <Kashyap.Desai@lsi.com>
Subject: [PATCH 2/7] megaraid_sas: Add module param for configurable MSI-X vector count
Date: Mon, 1 Oct 2012 19:26:59 -0700 [thread overview]
Message-ID: <CAHtARFFb6hkxFsdRxOe4f7kbstegyjBrTRdMQEpBGo4ED8qf-g@mail.gmail.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 1279 bytes --]
James/linux-scsi,
The following patch for megaraid_sas adds a module parameter for
configurable MSI-X vector count.
Signed-off-by: Adam Radford <aradford@gmail.com>
diff -Naur scsi-misc/drivers/scsi/megaraid/megaraid_sas_base.c
scsi-misc.new/drivers/scsi/megaraid/megaraid_sas_base.c
--- scsi-misc/drivers/scsi/megaraid/megaraid_sas_base.c 2012-10-01
18:03:42.000000000 -0700
+++ scsi-misc.new/drivers/scsi/megaraid/megaraid_sas_base.c 2012-10-01
18:05:20.831864155 -0700
@@ -71,6 +71,10 @@
module_param(msix_disable, int, S_IRUGO);
MODULE_PARM_DESC(msix_disable, "Disable MSI-X interrupt handling. Default: 0");
+static unsigned int msix_vectors;
+module_param(msix_vectors, int, S_IRUGO);
+MODULE_PARM_DESC(msix_vectors, "MSI-X max vector count. Default: Set by FW");
+
static int throttlequeuedepth = MEGASAS_THROTTLE_QUEUE_DEPTH;
module_param(throttlequeuedepth, int, S_IRUGO);
MODULE_PARM_DESC(throttlequeuedepth,
@@ -3520,6 +3524,10 @@
instance->msix_vectors = (readl(&instance->reg_set->
outbound_scratch_pad_2
) & 0x1F) + 1;
+ if (msix_vectors)
+ instance->msix_vectors =
+ min(msix_vectors,
+ instance->msix_vectors);
} else
instance->msix_vectors = 1;
/* Don't bother allocating more MSI-X vectors than cpus */
[-- Attachment #2: megaraid_sas.patch2 --]
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diff -Naur scsi-misc/drivers/scsi/megaraid/megaraid_sas_base.c scsi-misc.new/drivers/scsi/megaraid/megaraid_sas_base.c
--- scsi-misc/drivers/scsi/megaraid/megaraid_sas_base.c 2012-10-01 18:03:42.000000000 -0700
+++ scsi-misc.new/drivers/scsi/megaraid/megaraid_sas_base.c 2012-10-01 18:05:20.831864155 -0700
@@ -71,6 +71,10 @@
module_param(msix_disable, int, S_IRUGO);
MODULE_PARM_DESC(msix_disable, "Disable MSI-X interrupt handling. Default: 0");
+static unsigned int msix_vectors;
+module_param(msix_vectors, int, S_IRUGO);
+MODULE_PARM_DESC(msix_vectors, "MSI-X max vector count. Default: Set by FW");
+
static int throttlequeuedepth = MEGASAS_THROTTLE_QUEUE_DEPTH;
module_param(throttlequeuedepth, int, S_IRUGO);
MODULE_PARM_DESC(throttlequeuedepth,
@@ -3520,6 +3524,10 @@
instance->msix_vectors = (readl(&instance->reg_set->
outbound_scratch_pad_2
) & 0x1F) + 1;
+ if (msix_vectors)
+ instance->msix_vectors =
+ min(msix_vectors,
+ instance->msix_vectors);
} else
instance->msix_vectors = 1;
/* Don't bother allocating more MSI-X vectors than cpus */
reply other threads:[~2012-10-02 2:26 UTC|newest]
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