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[SCSI] mpt2sas: Added sysfs support for trace buffer

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Added support so the diag ring buffer can be pulled via sysfs
Added three new shost attributes: host_trace_buffer,
host_trace_buffer_enable, and host_trace_buffer_size.  The
host_trace_buffer_enable attribute is used to either post or release
the trace buffers.   The host_trace_buffer_size attribute contains
the size of the trace buffer. The host_trace_buffer atttribute contains
a maximum 4KB window of the buffer. In order to read the entire host buffer,
you will need to write the offset to  host_trace_buffer prior to reading
it. release the host buffer, then write the entire host buffer contents to
a file.
In addition to this enhancement, we moved the automatic posting of host buffers
at driver load time to be called prior to port_enable, instead of after.
That way discovery is available in the host buffer.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Kashyap, Desai
2010-06-17 13:43:17 +05:30
committed by James Bottomley
parent 203d65b16c
commit 570c67ac44
3 changed files with 200 additions and 4 deletions
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10
drivers/scsi/mpt2sas/mpt2sas_base.c
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@@ -3529,8 +3529,12 @@ _base_make_ioc_operational(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
if (sleep_flag == CAN_SLEEP)
_base_static_config_pages(ioc);
if (ioc->wait_for_port_enable_to_complete && disable_discovery > 0)
return r;
if (ioc->wait_for_port_enable_to_complete) {
if (diag_buffer_enable != 0)
mpt2sas_enable_diag_buffer(ioc, diag_buffer_enable);
if (disable_discovery > 0)
return r;
}
r = _base_send_port_enable(ioc, sleep_flag);
if (r)
@@ -3679,8 +3683,6 @@ mpt2sas_base_attach(struct MPT2SAS_ADAPTER *ioc)
goto out_free_resources;
mpt2sas_base_start_watchdog(ioc);
if (diag_buffer_enable != 0)
mpt2sas_enable_diag_buffer(ioc, diag_buffer_enable);
return 0;
out_free_resources: