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scsi: mpt3sas: Reduce memory footprint in kdump kernel 

To reduce the memory footprint of the driver in the kdump kernel, we
apply the following settings when reset_devices is set:

1. Use 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.

[mkp: fixed commit message]

Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@broadcom.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Sreekanth Reddy 2017-10-10 18:41:16 +05:30 коммит произвёл Martin K. Petersen
Родитель bbe3def3a1
Коммит 06f5f976a6
2 изменённых файлов: 13 добавлений и 3 удалений
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14
drivers/scsi/mpt3sas/mpt3sas_base.c
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@ -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;

2
drivers/scsi/mpt3sas/mpt3sas_base.h
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@ -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