ipr: kexec boot speed improvements
Subsystems (4)
PATCH 3/3 ipr: kexec boot speed improvements
Currently when performing a kexec boot with an ipr adapter, the adapter gets shutdown completely, flushing all write cache, as well as performing a full hardware reset of the card during the shutdown phase of the old kernel. This forces the new kernel to then wait for the adapter firmware to reinitialize, which slows down kexec boot. There is no need to do all of this on the newer ipr adapters, since they support the ability to cancel outstanding error buffers.
This patch adds a special case for kexec boot to simply cancel these outstanding error buffers, and as long as there is no other I/O outstanding to the adapter, which there shouldn't be, place the adapter into a state where it has no memory of any DMA addresses from the old kernel, then disable the device. This significantly speeds up kexec boot, particularly in configurations with multiple ipr adapters.
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drivers/scsi/ipr.c | 158 ++++++++++++++++++++++++++++++++++++++++++++++++++--- drivers/scsi/ipr.h | 6 +- 2 files changed, 155 insertions(+), 9 deletions(-)
drivers/scsi/ipr.h renamed from drivers/scsi/ipr.h~ipr_cancel_hcams2 +5 -1
@@ -195,6 +195,8 @@/* * Adapter Commands */ +#define IPR_CANCEL_REQUEST 0xC0 +#define IPR_CANCEL_64BIT_IOARCB 0x01#define IPR_QUERY_RSRC_STATE 0xC2#define IPR_RESET_DEVICE 0xC3#define IPR_RESET_TYPE_SELECT 0x80
@@ -221,6 +223,7 @@#define IPR_ABBREV_SHUTDOWN_TIMEOUT (10 * HZ)#define IPR_DUAL_IOA_ABBR_SHUTDOWN_TO (2 * 60 * HZ)#define IPR_DEVICE_RESET_TIMEOUT (ipr_fastfail ? 10 * HZ : 30 * HZ) +#define IPR_CANCEL_TIMEOUT (ipr_fastfail ? 10 * HZ : 30 * HZ)#define IPR_CANCEL_ALL_TIMEOUT (ipr_fastfail ? 10 * HZ : 30 * HZ)#define IPR_ABORT_TASK_TIMEOUT (ipr_fastfail ? 10 * HZ : 30 * HZ)#define IPR_INTERNAL_TIMEOUT (ipr_fastfail ? 10 * HZ : 30 * HZ)
@@ -1401,7 +1404,8 @@ enum ipr_shutdown_type {IPR_SHUTDOWN_NORMAL =0x00 ,IPR_SHUTDOWN_PREPARE_FOR_NORMAL =0x40 ,IPR_SHUTDOWN_ABBREV =0x80 , -IPR_SHUTDOWN_NONE =0x100 +IPR_SHUTDOWN_NONE =0x100 , + IPR_SHUTDOWN_KEXEC = 0x101, }; struct ipr_trace_entry {
drivers/scsi/ipr.c renamed from drivers/scsi/ipr.c~ipr_cancel_hcams2 +150 -8
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