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Subject[PATCH 03/10] mpt3sas: Reduce memory footprints in kdump kernel
Date
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.Reddy@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
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