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linux-next/drivers/scsi/mpt3sas
Sreekanth Reddy d04a6edfed scsi: mpt3sas: Register trace buffer based on NVDATA settings
Currently if user wishes to enable the host trace buffer during driver load
time, then user has to load the driver with module parameter
'diag_buffer_enable' set to one.

Alternatively now the user can enable host trace buffer by enabling the
following fields in manufacturing page11 in NVDATA (nvdata xml is used
while building HBA firmware image):

 * HostTraceBufferMaxSizeKB - Maximum trace buffer size in KB that host can
                              allocate,

 * HostTraceBufferMinSizeKB - Minimum trace buffer size in KB atleast host
                              should allocate,

 * HostTraceBufferDecrementSizeKB - size by which host can reduce from
                              buffer size and retry the buffer allocation
                              when buffer allocation failed with previous
                              calculated buffer size.

The driver will register the trace buffer automatically without any module
parameter during boot time when above fields are enabled in manufacturing
page11 in HBA firmware.

Driver follows the following algorithm for enabling the host trace buffer
during driver load time:

* If user has loaded the driver with module parameter 'diag_buffer_enable'
  set to one, then driver allocates 2MB buffer and registers this buffer
  with HBA firmware for capturing the firmware trace logs.

* Else driver reads manufacture page11 data and checks whether
  HostTraceBufferMaxSizeKB filed is zero or not?

  - If HostTraceBufferMaxSizeKB is non-zero then driver tries to allocate
    HostTraceBufferMaxSizeKB size of memory. If the buffer allocation is
    successful, then it will register this buffer with HBA firmware, else
    in a loop the driver will try again by reducing the current buffer size
    with HostTraceBufferDecrementSizeKB size until memory allocation is
    successful or buffer size falls below HostTraceBufferMinSizeKB. If the
    memory allocation is successful, then the buffer will be registered
    with the firmware. Else, if the buffer size falls below the
    HostTraceBufferMinSizeKB, then driver won't register trace buffer with
    HBA firmware.

  - If HostTraceBufferMaxSizeKB is zero, then driver won't register trace
    buffer with HBA firmware.

Link: https://lore.kernel.org/r/1568379890-18347-2-git-send-email-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-09-30 22:32:46 -04:00
..
mpi scsi: mpt3sas: Update MPI headers to 2.6.8 spec 2019-08-07 22:46:19 -04:00
Kconfig scsi: mpt3sas: Irq poll to avoid CPU hard lockups 2019-03-18 17:16:43 -04:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mpt3sas_base.c SCSI misc on 20190919 2019-09-21 10:50:15 -07:00
mpt3sas_base.h scsi: mpt3sas: Register trace buffer based on NVDATA settings 2019-09-30 22:32:46 -04:00
mpt3sas_config.c scsi: mpt3sas: Enable interrupt coalescing on high iops 2019-06-18 19:46:26 -04:00
mpt3sas_ctl.c scsi: mpt3sas: Register trace buffer based on NVDATA settings 2019-09-30 22:32:46 -04:00
mpt3sas_ctl.h scsi: mpt3sas: Increase event log buffer to support 24 port HBA's. 2018-05-08 00:34:20 -04:00
mpt3sas_debug.h mpt2sas, mpt3sas: Remove SCSI_MPTXSAS_LOGGING entry from Kconfig 2015-11-11 18:31:14 -05:00
mpt3sas_scsih.c scsi: mpt3sas: Register trace buffer based on NVDATA settings 2019-09-30 22:32:46 -04:00
mpt3sas_transport.c scsi: mpt3sas: function pointers of request descriptor 2019-06-18 19:46:25 -04:00
mpt3sas_trigger_diag.c scsi: mpt3sas: Convert uses of pr_<level> with MPT3SAS_FMT to ioc_<level> 2018-10-10 22:00:43 -04:00
mpt3sas_trigger_diag.h mpt2sas, mpt3sas: Update attribution language to Avago 2015-01-13 16:27:27 +01:00
mpt3sas_warpdrive.c scsi: mpt3sas: Convert uses of pr_<level> with MPT3SAS_FMT to ioc_<level> 2018-10-10 22:00:43 -04:00