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authorSreekanth Reddy <Sreekanth.Reddy@lsi.com>2013-08-14 18:23:20 +0530
committerJames Bottomley <JBottomley@Parallels.com>2013-09-03 07:27:55 -0700
commit9c5000606d2a0dda8de892ac00b1bcf44b1834f6 (patch)
tree0d890cc0f393a7adb02ca117f4808aacb32ff665 /drivers/scsi/mpt3sas
parenta9623da05f8a2930fadafd27fe621b16886b259d (diff)
[SCSI] mpt3sas: Added a driver module parameter max_msix_vectors
Added a driver module parameter max_msix_vectors. Using this module parameter the maximum number of MSI-X vectors could be set. The number of MSI-X vectors used would be the minimum of MSI-X vectors supported by the HBA, the number of CPU cores and the value set to max_msix_vectors module parameter. The default value of this module parameter is set to 8. The default value of this parameter is set to 8 inorder to reduce the amount of memory required for Reply Descriptor Post queue. This is because with the higher MSI-X vectors, some times kernel is not able to allocate the requested amount of memory and crash is observed. To overcome this problem, the default value is set to 8. Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@lsi.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/mpt3sas')
-rw-r--r--drivers/scsi/mpt3sas/mpt3sas_base.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index 34ff896a140d..fa785062e97b 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -82,6 +82,10 @@ static int msix_disable = -1;
module_param(msix_disable, int, 0);
MODULE_PARM_DESC(msix_disable, " disable msix routed interrupts (default=0)");
+static int max_msix_vectors = 8;
+module_param(max_msix_vectors, int, 0);
+MODULE_PARM_DESC(max_msix_vectors,
+ " max msix vectors - (default=8)");
static int mpt3sas_fwfault_debug;
MODULE_PARM_DESC(mpt3sas_fwfault_debug,
@@ -1721,6 +1725,16 @@ _base_enable_msix(struct MPT3SAS_ADAPTER *ioc)
ioc->reply_queue_count = min_t(int, ioc->cpu_count,
ioc->msix_vector_count);
+ printk(MPT3SAS_FMT "MSI-X vectors supported: %d, no of cores"
+ ": %d, max_msix_vectors: %d\n", ioc->name, ioc->msix_vector_count,
+ ioc->cpu_count, max_msix_vectors);
+
+ if (max_msix_vectors > 0) {
+ ioc->reply_queue_count = min_t(int, max_msix_vectors,
+ ioc->reply_queue_count);
+ ioc->msix_vector_count = ioc->reply_queue_count;
+ }
+
entries = kcalloc(ioc->reply_queue_count, sizeof(struct msix_entry),
GFP_KERNEL);
if (!entries) {