* [PATCH v2 16/30] cxlflash: Fix host link up event handling
@ 2015-09-16 16:58 Matthew R. Ochs
0 siblings, 0 replies; 3+ messages in thread
From: Matthew R. Ochs @ 2015-09-16 16:58 UTC (permalink / raw)
To: linux-scsi, James.Bottomley, nab, brking, imunsie, dja,
andrew.donnellan
Cc: mikey, linuxppc-dev, Manoj N. Kumar
Following a link up event, the LUNs available to the host may
have changed. Without rescanning the host, the LUN topology is
unknown to the user. In such a state, the user would be unable
to locate provisioned resources.
To remedy, the host should be rescanned after a link up event.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
---
drivers/scsi/cxlflash/common.h | 2 +-
drivers/scsi/cxlflash/main.c | 17 +++++++++++++----
drivers/scsi/cxlflash/main.h | 1 +
3 files changed, 15 insertions(+), 5 deletions(-)
diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h
index c8327ac..517da25 100644
--- a/drivers/scsi/cxlflash/common.h
+++ b/drivers/scsi/cxlflash/common.h
@@ -102,7 +102,7 @@ struct cxlflash_cfg {
enum cxlflash_init_state init_state;
enum cxlflash_lr_state lr_state;
int lr_port;
-
+ atomic_t scan_host_needed;
atomic_t remove_active;
struct cxl_afu *cxl_afu;
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index b3838af..39ad7a3 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -1120,17 +1120,17 @@ static const struct asyc_intr_info ainfo[] = {
{SISL_ASTATUS_FC0_CRC_T, "CRC threshold exceeded", 0, LINK_RESET},
{SISL_ASTATUS_FC0_LOGI_R, "login timed out, retrying", 0, 0},
{SISL_ASTATUS_FC0_LOGI_F, "login failed", 0, CLR_FC_ERROR},
- {SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, 0},
+ {SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, SCAN_HOST},
{SISL_ASTATUS_FC0_LINK_DN, "link down", 0, 0},
- {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, 0},
+ {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, SCAN_HOST},
{SISL_ASTATUS_FC1_OTHER, "other error", 1, CLR_FC_ERROR | LINK_RESET},
{SISL_ASTATUS_FC1_LOGO, "target initiated LOGO", 1, 0},
{SISL_ASTATUS_FC1_CRC_T, "CRC threshold exceeded", 1, LINK_RESET},
{SISL_ASTATUS_FC1_LOGI_R, "login timed out, retrying", 1, 0},
{SISL_ASTATUS_FC1_LOGI_F, "login failed", 1, CLR_FC_ERROR},
- {SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, 0},
+ {SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, SCAN_HOST},
{SISL_ASTATUS_FC1_LINK_DN, "link down", 1, 0},
- {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, 0},
+ {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, SCAN_HOST},
{0x0, "", 0, 0} /* terminator */
};
@@ -1361,6 +1361,11 @@ static irqreturn_t cxlflash_async_err_irq(int irq, void *data)
writeq_be(reg, &global->fc_regs[port][FC_ERROR / 8]);
writeq_be(0, &global->fc_regs[port][FC_ERRCAP / 8]);
}
+
+ if (info->action & SCAN_HOST) {
+ atomic_inc(&cfg->scan_host_needed);
+ schedule_work(&cfg->work_q);
+ }
}
out:
@@ -2320,6 +2325,7 @@ MODULE_DEVICE_TABLE(pci, cxlflash_pci_table);
* - Link reset which cannot be performed on interrupt context due to
* blocking up to a few seconds
* - Read AFU command room
+ * - Rescan the host
*/
static void cxlflash_worker_thread(struct work_struct *work)
{
@@ -2362,6 +2368,9 @@ static void cxlflash_worker_thread(struct work_struct *work)
}
spin_unlock_irqrestore(cfg->host->host_lock, lock_flags);
+
+ if (atomic_dec_if_positive(&cfg->scan_host_needed) >= 0)
+ scsi_scan_host(cfg->host);
}
/**
diff --git a/drivers/scsi/cxlflash/main.h b/drivers/scsi/cxlflash/main.h
index cf0e809..6032456 100644
--- a/drivers/scsi/cxlflash/main.h
+++ b/drivers/scsi/cxlflash/main.h
@@ -99,6 +99,7 @@ struct asyc_intr_info {
u8 action;
#define CLR_FC_ERROR 0x01
#define LINK_RESET 0x02
+#define SCAN_HOST 0x04
};
#ifndef CONFIG_CXL_EEH
--
2.1.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH v2 16/30] cxlflash: Fix host link up event handling
2015-09-16 21:23 [PATCH v2 00/30] cxlflash: Miscellaneous bug fixes and corrections Matthew R. Ochs
@ 2015-09-16 21:30 ` Matthew R. Ochs
2015-09-21 21:47 ` Brian King
0 siblings, 1 reply; 3+ messages in thread
From: Matthew R. Ochs @ 2015-09-16 21:30 UTC (permalink / raw)
To: linux-scsi, James Bottomley, Nicholas A. Bellinger, Brian King,
Ian Munsie, Daniel Axtens, Andrew Donnellan
Cc: Michael Neuling, linuxppc-dev, Manoj N. Kumar
Following a link up event, the LUNs available to the host may
have changed. Without rescanning the host, the LUN topology is
unknown to the user. In such a state, the user would be unable
to locate provisioned resources.
To remedy, the host should be rescanned after a link up event.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
---
drivers/scsi/cxlflash/common.h | 2 +-
drivers/scsi/cxlflash/main.c | 17 +++++++++++++----
drivers/scsi/cxlflash/main.h | 1 +
3 files changed, 15 insertions(+), 5 deletions(-)
diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h
index c8327ac..517da25 100644
--- a/drivers/scsi/cxlflash/common.h
+++ b/drivers/scsi/cxlflash/common.h
@@ -102,7 +102,7 @@ struct cxlflash_cfg {
enum cxlflash_init_state init_state;
enum cxlflash_lr_state lr_state;
int lr_port;
-
+ atomic_t scan_host_needed;
atomic_t remove_active;
struct cxl_afu *cxl_afu;
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index b3838af..39ad7a3 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -1120,17 +1120,17 @@ static const struct asyc_intr_info ainfo[] = {
{SISL_ASTATUS_FC0_CRC_T, "CRC threshold exceeded", 0, LINK_RESET},
{SISL_ASTATUS_FC0_LOGI_R, "login timed out, retrying", 0, 0},
{SISL_ASTATUS_FC0_LOGI_F, "login failed", 0, CLR_FC_ERROR},
- {SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, 0},
+ {SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, SCAN_HOST},
{SISL_ASTATUS_FC0_LINK_DN, "link down", 0, 0},
- {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, 0},
+ {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, SCAN_HOST},
{SISL_ASTATUS_FC1_OTHER, "other error", 1, CLR_FC_ERROR | LINK_RESET},
{SISL_ASTATUS_FC1_LOGO, "target initiated LOGO", 1, 0},
{SISL_ASTATUS_FC1_CRC_T, "CRC threshold exceeded", 1, LINK_RESET},
{SISL_ASTATUS_FC1_LOGI_R, "login timed out, retrying", 1, 0},
{SISL_ASTATUS_FC1_LOGI_F, "login failed", 1, CLR_FC_ERROR},
- {SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, 0},
+ {SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, SCAN_HOST},
{SISL_ASTATUS_FC1_LINK_DN, "link down", 1, 0},
- {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, 0},
+ {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, SCAN_HOST},
{0x0, "", 0, 0} /* terminator */
};
@@ -1361,6 +1361,11 @@ static irqreturn_t cxlflash_async_err_irq(int irq, void *data)
writeq_be(reg, &global->fc_regs[port][FC_ERROR / 8]);
writeq_be(0, &global->fc_regs[port][FC_ERRCAP / 8]);
}
+
+ if (info->action & SCAN_HOST) {
+ atomic_inc(&cfg->scan_host_needed);
+ schedule_work(&cfg->work_q);
+ }
}
out:
@@ -2320,6 +2325,7 @@ MODULE_DEVICE_TABLE(pci, cxlflash_pci_table);
* - Link reset which cannot be performed on interrupt context due to
* blocking up to a few seconds
* - Read AFU command room
+ * - Rescan the host
*/
static void cxlflash_worker_thread(struct work_struct *work)
{
@@ -2362,6 +2368,9 @@ static void cxlflash_worker_thread(struct work_struct *work)
}
spin_unlock_irqrestore(cfg->host->host_lock, lock_flags);
+
+ if (atomic_dec_if_positive(&cfg->scan_host_needed) >= 0)
+ scsi_scan_host(cfg->host);
}
/**
diff --git a/drivers/scsi/cxlflash/main.h b/drivers/scsi/cxlflash/main.h
index cf0e809..6032456 100644
--- a/drivers/scsi/cxlflash/main.h
+++ b/drivers/scsi/cxlflash/main.h
@@ -99,6 +99,7 @@ struct asyc_intr_info {
u8 action;
#define CLR_FC_ERROR 0x01
#define LINK_RESET 0x02
+#define SCAN_HOST 0x04
};
#ifndef CONFIG_CXL_EEH
--
2.1.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2 16/30] cxlflash: Fix host link up event handling
2015-09-16 21:30 ` [PATCH v2 16/30] cxlflash: Fix host link up event handling Matthew R. Ochs
@ 2015-09-21 21:47 ` Brian King
0 siblings, 0 replies; 3+ messages in thread
From: Brian King @ 2015-09-21 21:47 UTC (permalink / raw)
To: Matthew R. Ochs, linux-scsi, James Bottomley,
Nicholas A. Bellinger, Ian Munsie, Daniel Axtens,
Andrew Donnellan
Cc: Michael Neuling, linuxppc-dev, Manoj N. Kumar
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
--
Brian King
Power Linux I/O
IBM Linux Technology Center
^ permalink raw reply [flat|nested] 3+ messages in thread
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2015-09-16 21:23 [PATCH v2 00/30] cxlflash: Miscellaneous bug fixes and corrections Matthew R. Ochs
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2015-09-21 21:47 ` Brian King
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