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scsi: megaraid_sas: Dump system interface regs from sysfs 

Add a sysfs interface to dump the controller's system interface registers.

Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Shivasharan S 2019-05-07 10:05:40 -07:00 committed by Martin K. Petersen
parent 4fe55035f3
commit cfb9a30e5d
1 changed files with 37 additions and 0 deletions
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37
drivers/scsi/megaraid/megaraid_sas_base.c
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@ -2900,6 +2900,29 @@ megasas_dump_fusion_io(struct scsi_cmnd *scmd)
}
/*
* megasas_dump_sys_regs - This function will dump system registers through
* sysfs.
* @reg_set: Pointer to System register set.
* @buf: Buffer to which output is to be written.
* @return: Number of bytes written to buffer.
*/
static inline ssize_t
megasas_dump_sys_regs(void __iomem *reg_set, char *buf)
{
unsigned int i, sz = 256;
int bytes_wrote = 0;
char *loc = (char *)buf;
u32 __iomem *reg = (u32 __iomem *)reg_set;
for (i = 0; i < sz / sizeof(u32); i++) {
bytes_wrote += snprintf(loc + bytes_wrote, PAGE_SIZE,
"%08x: %08x\n", (i * 4),
readl(&reg[i]));
}
return bytes_wrote;
}
/**
* megasas_reset_bus_host - Bus & host reset handler entry point
*/
@ -3222,6 +3245,17 @@ megasas_fw_cmds_outstanding_show(struct device *cdev,
return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&instance->fw_outstanding));
}
static ssize_t
megasas_dump_system_regs_show(struct device *cdev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(cdev);
struct megasas_instance *instance =
(struct megasas_instance *)shost->hostdata;
return megasas_dump_sys_regs(instance->reg_set, buf);
}
static DEVICE_ATTR(fw_crash_buffer, S_IRUGO | S_IWUSR,
megasas_fw_crash_buffer_show, megasas_fw_crash_buffer_store);
static DEVICE_ATTR(fw_crash_buffer_size, S_IRUGO,
@ -3234,6 +3268,8 @@ static DEVICE_ATTR(ldio_outstanding, S_IRUGO,
megasas_ldio_outstanding_show, NULL);
static DEVICE_ATTR(fw_cmds_outstanding, S_IRUGO,
megasas_fw_cmds_outstanding_show, NULL);
static DEVICE_ATTR(dump_system_regs, S_IRUGO,
megasas_dump_system_regs_show, NULL);
struct device_attribute *megaraid_host_attrs[] = {
&dev_attr_fw_crash_buffer_size,
@ -3242,6 +3278,7 @@ struct device_attribute *megaraid_host_attrs[] = {
&dev_attr_page_size,
&dev_attr_ldio_outstanding,
&dev_attr_fw_cmds_outstanding,
&dev_attr_dump_system_regs,
NULL,
};