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path: root/drivers/scsi/lpfc/lpfc_attr.c
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Diffstat (limited to 'drivers/scsi/lpfc/lpfc_attr.c')
-rw-r--r--drivers/scsi/lpfc/lpfc_attr.c92
1 files changed, 90 insertions, 2 deletions
diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index 89e8222bc7cc..5625a8c2a8fd 100644
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -278,6 +278,71 @@ lpfc_board_online_store(struct class_device *cdev, const char *buf,
return -EIO;
}
+static ssize_t
+lpfc_poll_show(struct class_device *cdev, char *buf)
+{
+ struct Scsi_Host *host = class_to_shost(cdev);
+ struct lpfc_hba *phba = (struct lpfc_hba*)host->hostdata[0];
+
+ return snprintf(buf, PAGE_SIZE, "%#x\n", phba->cfg_poll);
+}
+
+static ssize_t
+lpfc_poll_store(struct class_device *cdev, const char *buf,
+ size_t count)
+{
+ struct Scsi_Host *host = class_to_shost(cdev);
+ struct lpfc_hba *phba = (struct lpfc_hba*)host->hostdata[0];
+ uint32_t creg_val;
+ uint32_t old_val;
+ int val=0;
+
+ if (!isdigit(buf[0]))
+ return -EINVAL;
+
+ if (sscanf(buf, "%i", &val) != 1)
+ return -EINVAL;
+
+ if ((val & 0x3) != val)
+ return -EINVAL;
+
+ spin_lock_irq(phba->host->host_lock);
+
+ old_val = phba->cfg_poll;
+
+ if (val & ENABLE_FCP_RING_POLLING) {
+ if ((val & DISABLE_FCP_RING_INT) &&
+ !(old_val & DISABLE_FCP_RING_INT)) {
+ creg_val = readl(phba->HCregaddr);
+ creg_val &= ~(HC_R0INT_ENA << LPFC_FCP_RING);
+ writel(creg_val, phba->HCregaddr);
+ readl(phba->HCregaddr); /* flush */
+
+ lpfc_poll_start_timer(phba);
+ }
+ } else if (val != 0x0) {
+ spin_unlock_irq(phba->host->host_lock);
+ return -EINVAL;
+ }
+
+ if (!(val & DISABLE_FCP_RING_INT) &&
+ (old_val & DISABLE_FCP_RING_INT))
+ {
+ spin_unlock_irq(phba->host->host_lock);
+ del_timer(&phba->fcp_poll_timer);
+ spin_lock_irq(phba->host->host_lock);
+ creg_val = readl(phba->HCregaddr);
+ creg_val |= (HC_R0INT_ENA << LPFC_FCP_RING);
+ writel(creg_val, phba->HCregaddr);
+ readl(phba->HCregaddr); /* flush */
+ }
+
+ phba->cfg_poll = val;
+
+ spin_unlock_irq(phba->host->host_lock);
+
+ return strlen(buf);
+}
#define lpfc_param_show(attr) \
static ssize_t \
@@ -416,6 +481,15 @@ static CLASS_DEVICE_ATTR(management_version, S_IRUGO, management_version_show,
static CLASS_DEVICE_ATTR(board_online, S_IRUGO | S_IWUSR,
lpfc_board_online_show, lpfc_board_online_store);
+static int lpfc_poll = 0;
+module_param(lpfc_poll, int, 0);
+MODULE_PARM_DESC(lpfc_poll, "FCP ring polling mode control:"
+ " 0 - none,"
+ " 1 - poll with interrupts enabled"
+ " 3 - poll and disable FCP ring interrupts");
+
+static CLASS_DEVICE_ATTR(lpfc_poll, S_IRUGO | S_IWUSR,
+ lpfc_poll_show, lpfc_poll_store);
/*
# lpfc_log_verbose: Only turn this flag on if you are willing to risk being
@@ -523,10 +597,10 @@ LPFC_ATTR_R(ack0, 0, 0, 1, "Enable ACK0 support");
# is 0. Default value of cr_count is 1. The cr_count feature is disabled if
# cr_delay is set to 0.
*/
-LPFC_ATTR(cr_delay, 0, 0, 63, "A count of milliseconds after which an"
+LPFC_ATTR_RW(cr_delay, 0, 0, 63, "A count of milliseconds after which an"
"interrupt response is generated");
-LPFC_ATTR(cr_count, 1, 1, 255, "A count of I/O completions after which an"
+LPFC_ATTR_RW(cr_count, 1, 1, 255, "A count of I/O completions after which an"
"interrupt response is generated");
/*
@@ -553,6 +627,13 @@ LPFC_ATTR(discovery_threads, 32, 1, 64, "Maximum number of ELS commands"
LPFC_ATTR_R(max_luns, 256, 1, 32768,
"Maximum number of LUNs per target driver will support");
+/*
+# lpfc_poll_tmo: .Milliseconds driver will wait between polling FCP ring.
+# Value range is [1,255], default value is 10.
+*/
+LPFC_ATTR_RW(poll_tmo, 10, 1, 255,
+ "Milliseconds driver will wait between polling FCP ring");
+
struct class_device_attribute *lpfc_host_attrs[] = {
&class_device_attr_info,
&class_device_attr_serialnum,
@@ -575,11 +656,15 @@ struct class_device_attribute *lpfc_host_attrs[] = {
&class_device_attr_lpfc_topology,
&class_device_attr_lpfc_scan_down,
&class_device_attr_lpfc_link_speed,
+ &class_device_attr_lpfc_cr_delay,
+ &class_device_attr_lpfc_cr_count,
&class_device_attr_lpfc_fdmi_on,
&class_device_attr_lpfc_max_luns,
&class_device_attr_nport_evt_cnt,
&class_device_attr_management_version,
&class_device_attr_board_online,
+ &class_device_attr_lpfc_poll,
+ &class_device_attr_lpfc_poll_tmo,
NULL,
};
@@ -1292,6 +1377,9 @@ lpfc_get_cfgparam(struct lpfc_hba *phba)
lpfc_fdmi_on_init(phba, lpfc_fdmi_on);
lpfc_discovery_threads_init(phba, lpfc_discovery_threads);
lpfc_max_luns_init(phba, lpfc_max_luns);
+ lpfc_poll_tmo_init(phba, lpfc_poll_tmo);
+
+ phba->cfg_poll = lpfc_poll;
/*
* The total number of segments is the configuration value plus 2