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Commit cfb9a30e authored by Shivasharan S's avatar Shivasharan S Committed by Martin K. Petersen
Browse files

scsi: megaraid_sas: Dump system interface regs from sysfs 



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

Signed-off-by: default avatarSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: default avatarShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 4fe55035

drivers/scsi/megaraid/megaraid_sas_base.c

+37 −0
Original line number Original line Diff line number Diff line
@@ -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

 * 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));

	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,

static DEVICE_ATTR(fw_crash_buffer, S_IRUGO | S_IWUSR,

	megasas_fw_crash_buffer_show, megasas_fw_crash_buffer_store);

	megasas_fw_crash_buffer_show, megasas_fw_crash_buffer_store);

static DEVICE_ATTR(fw_crash_buffer_size, S_IRUGO,

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);

	megasas_ldio_outstanding_show, NULL);

static DEVICE_ATTR(fw_cmds_outstanding, S_IRUGO,

static DEVICE_ATTR(fw_cmds_outstanding, S_IRUGO,

	megasas_fw_cmds_outstanding_show, NULL);

	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[] = {

struct device_attribute *megaraid_host_attrs[] = {

	&dev_attr_fw_crash_buffer_size,

	&dev_attr_fw_crash_buffer_size,
@@ -3242,6 +3278,7 @@ struct device_attribute *megaraid_host_attrs[] = { 
	&dev_attr_page_size,

	&dev_attr_page_size,

	&dev_attr_ldio_outstanding,

	&dev_attr_ldio_outstanding,

	&dev_attr_fw_cmds_outstanding,

	&dev_attr_fw_cmds_outstanding,

	&dev_attr_dump_system_regs,

	NULL,

	NULL,

};

};