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author | Kashyap, Desai <kashyap.desai@lsi.com> | 2010-06-17 13:43:17 +0530 |
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committer | James Bottomley <James.Bottomley@suse.de> | 2010-07-27 12:02:14 -0500 |
commit | 570c67ac443dab5c46e5744e950f0539724cb65d (patch) | |
tree | dad14200b33f9c0d24c43886b7a88b2a7bf0f2eb /drivers/scsi/mpt2sas/mpt2sas_ctl.c | |
parent | 203d65b16cfef448dbfb79f66b672be4511fc6a9 (diff) | |
download | op-kernel-dev-570c67ac443dab5c46e5744e950f0539724cb65d.zip op-kernel-dev-570c67ac443dab5c46e5744e950f0539724cb65d.tar.gz |
[SCSI] 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 <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/mpt2sas/mpt2sas_ctl.c')
-rw-r--r-- | drivers/scsi/mpt2sas/mpt2sas_ctl.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/drivers/scsi/mpt2sas/mpt2sas_ctl.c b/drivers/scsi/mpt2sas/mpt2sas_ctl.c index 25c866e..371f063 100644 --- a/drivers/scsi/mpt2sas/mpt2sas_ctl.c +++ b/drivers/scsi/mpt2sas/mpt2sas_ctl.c @@ -2603,6 +2603,195 @@ _ctl_ioc_reset_count_show(struct device *cdev, struct device_attribute *attr, static DEVICE_ATTR(ioc_reset_count, S_IRUGO, _ctl_ioc_reset_count_show, NULL); +struct DIAG_BUFFER_START { + u32 Size; + u32 DiagVersion; + u8 BufferType; + u8 Reserved[3]; + u32 Reserved1; + u32 Reserved2; + u32 Reserved3; +}; +/** + * _ctl_host_trace_buffer_size_show - host buffer size (trace only) + * @cdev - pointer to embedded class device + * @buf - the buffer returned + * + * A sysfs 'read-only' shost attribute. + */ +static ssize_t +_ctl_host_trace_buffer_size_show(struct device *cdev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(cdev); + struct MPT2SAS_ADAPTER *ioc = shost_priv(shost); + u32 size = 0; + struct DIAG_BUFFER_START *request_data; + + if (!ioc->diag_buffer[MPI2_DIAG_BUF_TYPE_TRACE]) { + printk(MPT2SAS_ERR_FMT "%s: host_trace_buffer is not " + "registered\n", ioc->name, __func__); + return 0; + } + + if ((ioc->diag_buffer_status[MPI2_DIAG_BUF_TYPE_TRACE] & + MPT2_DIAG_BUFFER_IS_REGISTERED) == 0) { + printk(MPT2SAS_ERR_FMT "%s: host_trace_buffer is not " + "registered\n", ioc->name, __func__); + return 0; + } + + request_data = (struct DIAG_BUFFER_START *) + ioc->diag_buffer[MPI2_DIAG_BUF_TYPE_TRACE]; + if ((le32_to_cpu(request_data->DiagVersion) == 0x00000000 || + le32_to_cpu(request_data->DiagVersion) == 0x01000000) && + le32_to_cpu(request_data->Reserved3) == 0x4742444c) + size = le32_to_cpu(request_data->Size); + + ioc->ring_buffer_sz = size; + return snprintf(buf, PAGE_SIZE, "%d\n", size); +} +static DEVICE_ATTR(host_trace_buffer_size, S_IRUGO, + _ctl_host_trace_buffer_size_show, NULL); + +/** + * _ctl_host_trace_buffer_show - firmware ring buffer (trace only) + * @cdev - pointer to embedded class device + * @buf - the buffer returned + * + * A sysfs 'read/write' shost attribute. + * + * You will only be able to read 4k bytes of ring buffer at a time. + * In order to read beyond 4k bytes, you will have to write out the + * offset to the same attribute, it will move the pointer. + */ +static ssize_t +_ctl_host_trace_buffer_show(struct device *cdev, struct device_attribute *attr, + char *buf) +{ + struct Scsi_Host *shost = class_to_shost(cdev); + struct MPT2SAS_ADAPTER *ioc = shost_priv(shost); + void *request_data; + u32 size; + + if (!ioc->diag_buffer[MPI2_DIAG_BUF_TYPE_TRACE]) { + printk(MPT2SAS_ERR_FMT "%s: host_trace_buffer is not " + "registered\n", ioc->name, __func__); + return 0; + } + + if ((ioc->diag_buffer_status[MPI2_DIAG_BUF_TYPE_TRACE] & + MPT2_DIAG_BUFFER_IS_REGISTERED) == 0) { + printk(MPT2SAS_ERR_FMT "%s: host_trace_buffer is not " + "registered\n", ioc->name, __func__); + return 0; + } + + if (ioc->ring_buffer_offset > ioc->ring_buffer_sz) + return 0; + + size = ioc->ring_buffer_sz - ioc->ring_buffer_offset; + size = (size > PAGE_SIZE) ? PAGE_SIZE : size; + request_data = ioc->diag_buffer[0] + ioc->ring_buffer_offset; + memcpy(buf, request_data, size); + return size; +} + +static ssize_t +_ctl_host_trace_buffer_store(struct device *cdev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct Scsi_Host *shost = class_to_shost(cdev); + struct MPT2SAS_ADAPTER *ioc = shost_priv(shost); + int val = 0; + + if (sscanf(buf, "%d", &val) != 1) + return -EINVAL; + + ioc->ring_buffer_offset = val; + return strlen(buf); +} +static DEVICE_ATTR(host_trace_buffer, S_IRUGO | S_IWUSR, + _ctl_host_trace_buffer_show, _ctl_host_trace_buffer_store); + +/*****************************************/ + +/** + * _ctl_host_trace_buffer_enable_show - firmware ring buffer (trace only) + * @cdev - pointer to embedded class device + * @buf - the buffer returned + * + * A sysfs 'read/write' shost attribute. + * + * This is a mechnism to post/release host_trace_buffers + */ +static ssize_t +_ctl_host_trace_buffer_enable_show(struct device *cdev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(cdev); + struct MPT2SAS_ADAPTER *ioc = shost_priv(shost); + + if ((!ioc->diag_buffer[MPI2_DIAG_BUF_TYPE_TRACE]) || + ((ioc->diag_buffer_status[MPI2_DIAG_BUF_TYPE_TRACE] & + MPT2_DIAG_BUFFER_IS_REGISTERED) == 0)) + return snprintf(buf, PAGE_SIZE, "off\n"); + else if ((ioc->diag_buffer_status[MPI2_DIAG_BUF_TYPE_TRACE] & + MPT2_DIAG_BUFFER_IS_RELEASED)) + return snprintf(buf, PAGE_SIZE, "release\n"); + else + return snprintf(buf, PAGE_SIZE, "post\n"); +} + +static ssize_t +_ctl_host_trace_buffer_enable_store(struct device *cdev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct Scsi_Host *shost = class_to_shost(cdev); + struct MPT2SAS_ADAPTER *ioc = shost_priv(shost); + char str[10] = ""; + struct mpt2_diag_register diag_register; + u8 issue_reset = 0; + + if (sscanf(buf, "%s", str) != 1) + return -EINVAL; + + if (!strcmp(str, "post")) { + /* exit out if host buffers are already posted */ + if ((ioc->diag_buffer[MPI2_DIAG_BUF_TYPE_TRACE]) && + (ioc->diag_buffer_status[MPI2_DIAG_BUF_TYPE_TRACE] & + MPT2_DIAG_BUFFER_IS_REGISTERED) && + ((ioc->diag_buffer_status[MPI2_DIAG_BUF_TYPE_TRACE] & + MPT2_DIAG_BUFFER_IS_RELEASED) == 0)) + goto out; + memset(&diag_register, 0, sizeof(struct mpt2_diag_register)); + printk(MPT2SAS_INFO_FMT "posting host trace buffers\n", + ioc->name); + diag_register.buffer_type = MPI2_DIAG_BUF_TYPE_TRACE; + diag_register.requested_buffer_size = (1024 * 1024); + diag_register.unique_id = 0x7075900; + ioc->diag_buffer_status[MPI2_DIAG_BUF_TYPE_TRACE] = 0; + _ctl_diag_register_2(ioc, &diag_register); + } else if (!strcmp(str, "release")) { + /* exit out if host buffers are already released */ + if (!ioc->diag_buffer[MPI2_DIAG_BUF_TYPE_TRACE]) + goto out; + if ((ioc->diag_buffer_status[MPI2_DIAG_BUF_TYPE_TRACE] & + MPT2_DIAG_BUFFER_IS_REGISTERED) == 0) + goto out; + if ((ioc->diag_buffer_status[MPI2_DIAG_BUF_TYPE_TRACE] & + MPT2_DIAG_BUFFER_IS_RELEASED)) + goto out; + printk(MPT2SAS_INFO_FMT "releasing host trace buffer\n", + ioc->name); + _ctl_send_release(ioc, MPI2_DIAG_BUF_TYPE_TRACE, &issue_reset); + } + + out: + return strlen(buf); +} +static DEVICE_ATTR(host_trace_buffer_enable, S_IRUGO | S_IWUSR, + _ctl_host_trace_buffer_enable_show, _ctl_host_trace_buffer_enable_store); struct device_attribute *mpt2sas_host_attrs[] = { &dev_attr_version_fw, @@ -2621,6 +2810,9 @@ struct device_attribute *mpt2sas_host_attrs[] = { &dev_attr_fw_queue_depth, &dev_attr_host_sas_address, &dev_attr_ioc_reset_count, + &dev_attr_host_trace_buffer_size, + &dev_attr_host_trace_buffer, + &dev_attr_host_trace_buffer_enable, NULL, }; |