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megaraid_sas: reduce memory footprints in kdump mode 

This patch will reduce memory footprints of megaraid_sas driver when
booted in kdump mode.  Driver will not allocate memory for optional and
perfromance oriented features.  Below are key changes done in
megaraid_sas driver to do this:

1. Limit Controller's queue depth to 100 in kdump mode.

2. Do not allocate memory for system info buffer and PD info buffer.

3. Disable performance oriented features e.g. Disable RDPQ mode, disable
   dual queue depth, restrict to single MSI-x vector.

Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Reviewed-by: Hannes Reinicke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Sumit Saxena 2016-04-15 00:23:30 -07:00 committed by Martin K. Petersen
parent 1f275f976f
commit c3e385a1b9
3 changed files with 34 additions and 19 deletions
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2
drivers/scsi/megaraid/megaraid_sas.h
View File

@ -1344,6 +1344,8 @@ struct megasas_ctrl_info {
#define SCAN_PD_CHANNEL 0x1
#define SCAN_VD_CHANNEL 0x2
#define MEGASAS_KDUMP_QUEUE_DEPTH 100
enum MR_SCSI_CMD_TYPE {
READ_WRITE_LDIO = 0,
NON_READ_WRITE_LDIO = 1,

48
drivers/scsi/megaraid/megaraid_sas_base.c
View File

@ -5761,13 +5761,6 @@ static int megasas_probe_one(struct pci_dev *pdev,
break;
}
instance->system_info_buf = pci_zalloc_consistent(pdev,
sizeof(struct MR_DRV_SYSTEM_INFO),
&instance->system_info_h);
if (!instance->system_info_buf)
dev_info(&instance->pdev->dev, "Can't allocate system info buffer\n");
/* Crash dump feature related initialisation*/
instance->drv_buf_index = 0;
instance->drv_buf_alloc = 0;
@ -5777,14 +5770,6 @@ static int megasas_probe_one(struct pci_dev *pdev,
spin_lock_init(&instance->crashdump_lock);
instance->crash_dump_buf = NULL;
if (!reset_devices)
instance->crash_dump_buf = pci_alloc_consistent(pdev,
CRASH_DMA_BUF_SIZE,
&instance->crash_dump_h);
if (!instance->crash_dump_buf)
dev_err(&pdev->dev, "Can't allocate Firmware "
"crash dump DMA buffer\n");
megasas_poll_wait_aen = 0;
instance->flag_ieee = 0;
instance->ev = NULL;
@ -5803,11 +5788,26 @@ static int megasas_probe_one(struct pci_dev *pdev,
goto fail_alloc_dma_buf;
}
instance->pd_info = pci_alloc_consistent(pdev,
sizeof(struct MR_PD_INFO), &instance->pd_info_h);
if (!reset_devices) {
instance->system_info_buf = pci_zalloc_consistent(pdev,
sizeof(struct MR_DRV_SYSTEM_INFO),
&instance->system_info_h);
if (!instance->system_info_buf)
dev_info(&instance->pdev->dev, "Can't allocate system info buffer\n");
if (!instance->pd_info)
dev_err(&instance->pdev->dev, "Failed to alloc mem for pd_info\n");
instance->pd_info = pci_alloc_consistent(pdev,
sizeof(struct MR_PD_INFO), &instance->pd_info_h);
if (!instance->pd_info)
dev_err(&instance->pdev->dev, "Failed to alloc mem for pd_info\n");
instance->crash_dump_buf = pci_alloc_consistent(pdev,
CRASH_DMA_BUF_SIZE,
&instance->crash_dump_h);
if (!instance->crash_dump_buf)
dev_err(&pdev->dev, "Can't allocate Firmware "
"crash dump DMA buffer\n");
}
/*
* Initialize locks and queues
@ -7173,6 +7173,16 @@ static int __init megasas_init(void)
{
int rval;
/*
* Booted in kdump kernel, minimize memory footprints by
* disabling few features
*/
if (reset_devices) {
msix_vectors = 1;
rdpq_enable = 0;
dual_qdepth_disable = 1;
}
/*
* Announce driver version and other information
*/

3
drivers/scsi/megaraid/megaraid_sas_fusion.c
View File

@ -257,6 +257,9 @@ megasas_fusion_update_can_queue(struct megasas_instance *instance, int fw_boot_c
if (!instance->is_rdpq)
instance->max_fw_cmds = min_t(u16, instance->max_fw_cmds, 1024);
if (reset_devices)
instance->max_fw_cmds = min(instance->max_fw_cmds,
(u16)MEGASAS_KDUMP_QUEUE_DEPTH);
/*
* Reduce the max supported cmds by 1. This is to ensure that the
* reply_q_sz (1 more than the max cmd that driver may send)