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| author |   Sreekanth Reddy <sreekanth.reddy@broadcom.com> | 2019-09-13 09:04:44 -0400 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2019-09-30 22:32:47 -0400 |
| commit | a066f4c31359d07b1a2c5144b4b9a29901365fd0 (patch) | |
| tree | 1aa3057d4f132e3d81748a1b283137fbc40ff97c /drivers/scsi/mpt3sas/mpt3sas_ctl.h | |
| parent | scsi: mpt3sas: clear release bit when buffer reregistered (diff) | |
| download | linux-dev-a066f4c31359d07b1a2c5144b4b9a29901365fd0.tar.xz linux-dev-a066f4c31359d07b1a2c5144b4b9a29901365fd0.zip | |
scsi: mpt3sas: Reuse diag buffer allocated at load time
The diag buffer which is allocated during driver load time or through sysfs
parameter is marked as driver allocated diag buffer.
MPT3_DIAG_BUFFER_IS_DRIVER_ALLOCATED bit will be set for this buffer.
This buffer won't be de-allocated even when application issues unregister
command, driver just clears the registered status bit. Same buffer will be
reused while re-registering the same diag buffer type by any application.
While re-registering the same diag buffer type application has to register
with the same size that the buffer was allocated during driver load
time. This buffer size can be read by the application by issuing diag
'query' command.
This always makes sure that the memory is available for applications for
collecting the firmware logs. Only thing is that this won't allow the
application to re-register the diag buffer with different size, but the
buffer size which is allocated during driver load time will be enough for
most of the cases for collecting the firmware logs.
Link: https://lore.kernel.org/r/1568379890-18347-8-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>
Diffstat (limited to '')
| -rw-r--r-- | drivers/scsi/mpt3sas/mpt3sas_ctl.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.h b/drivers/scsi/mpt3sas/mpt3sas_ctl.h index d1a6ab148448..0f7aa4ddade0 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_ctl.h +++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.h @@ -318,6 +318,7 @@ struct mpt3_ioctl_btdh_mapping { #define MPT3_APP_FLAGS_APP_OWNED (0x0001) #define MPT3_APP_FLAGS_BUFFER_VALID (0x0002) #define MPT3_APP_FLAGS_FW_BUFFER_ACCESS (0x0004) +#define MPT3_APP_FLAGS_DYNAMIC_BUFFER_ALLOC (0x0008) /* flags for mpt3_diag_read_buffer */ #define MPT3_FLAGS_REREGISTER (0x0001) |