To reduce the memory footprints of the driver in kdump kernel,
we have made below driver setting when system boots in to kdump kernel,
1. Used single MSI-x vector.
2. Disable RDPQ mode.
3. Set sg_table_size to 32 by default.
4) Set SCSI IO Queue depth to 200.
Signed-off-by: Sreekanth Reddy <sreekanth.re...@broadcom.com>
---
drivers/scsi/mpt3sas/mpt3sas_base.c | 14 +++++++++++---
drivers/scsi/mpt3sas/mpt3sas_base.h | 2 ++
2 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c
b/drivers/scsi/mpt3sas/mpt3sas_base.c
index 844e29c..11c6afe 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -1990,7 +1990,7 @@ _base_enable_msix(struct MPT3SAS_ADAPTER *ioc)
ioc->cpu_count, max_msix_vectors);
if (!ioc->rdpq_array_enable && max_msix_vectors == -1)
- local_max_msix_vectors = 8;
+ local_max_msix_vectors = (reset_devices) ? 1 : 8;
else
local_max_msix_vectors = max_msix_vectors;
@@ -3308,6 +3308,11 @@ _base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc)
sg_tablesize = MPT3SAS_SG_DEPTH;
}
+ /* max sgl entries <= MPT_KDUMP_MIN_PHYS_SEGMENTS in KDUMP mode */
+ if (reset_devices)
+ sg_tablesize = min_t(unsigned short, sg_tablesize,
+ MPT_KDUMP_MIN_PHYS_SEGMENTS);
+
if (sg_tablesize < MPT_MIN_PHYS_SEGMENTS)
sg_tablesize = MPT_MIN_PHYS_SEGMENTS;
else if (sg_tablesize > MPT_MAX_PHYS_SEGMENTS) {
@@ -3340,7 +3345,10 @@ _base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc)
ioc->internal_depth, facts->RequestCredit);
if (max_request_credit > MAX_HBA_QUEUE_DEPTH)
max_request_credit = MAX_HBA_QUEUE_DEPTH;
- } else
+ } else if (reset_devices)
+ max_request_credit = min_t(u16, facts->RequestCredit,
+ (MPT3SAS_KDUMP_SCSI_IO_DEPTH + ioc->internal_depth));
+ else
max_request_credit = min_t(u16, facts->RequestCredit,
MAX_HBA_QUEUE_DEPTH);
@@ -4446,7 +4454,7 @@ _base_get_ioc_facts(struct MPT3SAS_ADAPTER *ioc)
if ((facts->IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_INTEGRATED_RAID))
ioc->ir_firmware = 1;
if ((facts->IOCCapabilities &
- MPI2_IOCFACTS_CAPABILITY_RDPQ_ARRAY_CAPABLE))
+ MPI2_IOCFACTS_CAPABILITY_RDPQ_ARRAY_CAPABLE) && (!reset_devices))
ioc->rdpq_array_capable = 1;
if (facts->IOCCapabilities & MPI26_IOCFACTS_CAPABILITY_ATOMIC_REQ)
ioc->atomic_desc_capable = 1;
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h
b/drivers/scsi/mpt3sas/mpt3sas_base.h
index a77bb7d..95ee1c6 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.h
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.h
@@ -92,6 +92,7 @@
*/
#define MPT_MAX_PHYS_SEGMENTS SG_CHUNK_SIZE
#define MPT_MIN_PHYS_SEGMENTS 16
+#define MPT_KDUMP_MIN_PHYS_SEGMENTS 32
#ifdef CONFIG_SCSI_MPT3SAS_MAX_SGE
#define MPT3SAS_SG_DEPTH CONFIG_SCSI_MPT3SAS_MAX_SGE
@@ -111,6 +112,7 @@
#define MPT3SAS_SATA_QUEUE_DEPTH 32
#define MPT3SAS_SAS_QUEUE_DEPTH 254
#define MPT3SAS_RAID_QUEUE_DEPTH 128
+#define MPT3SAS_KDUMP_SCSI_IO_DEPTH 200
#define MPT3SAS_RAID_MAX_SECTORS 8192
--
2.4.3
