mpt2sas: Added sysfs support for trace buffer

PATCH New Kashyap, Desai 1 participant 1 message Jun 17, 2010 SCSI

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Kashyap, Desai

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2010-06-17 08:48 UTC #0 lore raw

PATCH 8/17 mpt2sas: Added sysfs support for trace buffer

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 <[email protected]>

---

drivers/scsi/mpt2sas/mpt2sas_base.c +6 -4

index 88befc7..93c0623 100644
@@ -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:

drivers/scsi/mpt2sas/mpt2sas_base.h +2 -0

index ad277f3..d201c20 100644
@@ -750,6 +750,8 @@ struct MPT2SAS_ADAPTER {
 	Mpi2ManufacturingPage10_t manu_pg10;
 	u32		product_specific[MPI2_DIAG_BUF_TYPE_COUNT][23];
 	u32		diagnostic_flags[MPI2_DIAG_BUF_TYPE_COUNT];
+	u32		ring_buffer_offset;
+	u32		ring_buffer_sz;
 };
 
 typedef u8 (*MPT_CALLBACK)(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,

drivers/scsi/mpt2sas/mpt2sas_ctl.c +192 -0

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