[PATCH 1/2] mpt3sas: Reload SBR without rebooting HBA

[Ranjan Kumar <ranjan.kumar@broadcom.com>]

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Added a new IOCTL command MPT3ENABLEDIAGSBRRELOAD.
As a part of firmware update operation, applications use this IOCTL
command to set the SBR reload bit in the Host Diagnostic register.
So that HBA firmware is updated without power-cycling the system.

Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
---
 drivers/scsi/mpt3sas/mpt3sas_base.c  | 75 ++++++++++++++++++++--------
 drivers/scsi/mpt3sas/mpt3sas_base.h  |  4 ++
 drivers/scsi/mpt3sas/mpt3sas_ctl.c   | 54 ++++++++++++++++++++
 drivers/scsi/mpt3sas/mpt3sas_ctl.h   | 10 ++++
 drivers/scsi/mpt3sas/mpt3sas_scsih.c |  1 +
 5 files changed, 123 insertions(+), 21 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index 4e981ccaac41..594b19d06058 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -7920,26 +7920,20 @@ mpt3sas_base_validate_event_type(struct MPT3SAS_ADAPTER *ioc, u32 *event_type)
 }
 
 /**
- * _base_diag_reset - the "big hammer" start of day reset
+ * mpt3sas_base_unlock_and_get_host_diagnostic- enable Host Diagnostic Register writes
  * @ioc: per adapter object
+ * @host_diagnostic: host diagnostic register content
  *
  * Return: 0 for success, non-zero for failure.
  */
-static int
-_base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
+int
+mpt3sas_base_unlock_and_get_host_diagnostic(struct MPT3SAS_ADAPTER *ioc,
+	u32 *host_diagnostic)
 {
-	u32 host_diagnostic;
-	u32 ioc_state;
 	u32 count;
-	u32 hcb_size;
-
-	ioc_info(ioc, "sending diag reset !!\n");
-
-	pci_cfg_access_lock(ioc->pdev);
-
-	drsprintk(ioc, ioc_info(ioc, "clear interrupts\n"));
-
+	*host_diagnostic = 0;
 	count = 0;
+
 	do {
 		/* Write magic sequence to WriteSequence register
 		 * Loop until in diagnostic mode
@@ -7960,15 +7954,55 @@ _base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
 			ioc_info(ioc,
 			    "Stop writing magic sequence after 20 retries\n");
 			_base_dump_reg_set(ioc);
-			goto out;
+			return -EFAULT;
 		}
 
-		host_diagnostic = ioc->base_readl(&ioc->chip->HostDiagnostic);
+		*host_diagnostic = ioc->base_readl(&ioc->chip->HostDiagnostic);
 		drsprintk(ioc,
 			  ioc_info(ioc, "wrote magic sequence: count(%d), host_diagnostic(0x%08x)\n",
-				   count, host_diagnostic));
+				    count, *host_diagnostic));
+
+		} while ((*host_diagnostic & MPI2_DIAG_DIAG_WRITE_ENABLE) == 0);
+		return 0;
+}
+
+/**
+ * mpt3sas_base_lock_host_diagnostic - Disable Host Diagnostic Register writes
+ * @ioc: per adapter object
+ *
+ */
+void
+mpt3sas_base_lock_host_diagnostic(struct MPT3SAS_ADAPTER *ioc)
+{
+	drsprintk(ioc, ioc_info(ioc, "disable writes to the diagnostic register\n"));
+	writel(MPI2_WRSEQ_FLUSH_KEY_VALUE, &ioc->chip->WriteSequence);
+}
 
-	} while ((host_diagnostic & MPI2_DIAG_DIAG_WRITE_ENABLE) == 0);
+/**
+ * _base_diag_reset - the "big hammer" start of day reset
+ * @ioc: per adapter object
+ *
+ * Return: 0 for success, non-zero for failure.
+ */
+static int
+_base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
+{
+	u32 host_diagnostic;
+	u32 ioc_state;
+	u32 count;
+	u32 hcb_size;
+
+	ioc_info(ioc, "sending diag reset !!\n");
+
+	pci_cfg_access_lock(ioc->pdev);
+
+	drsprintk(ioc, ioc_info(ioc, "clear interrupts\n"));
+
+	mutex_lock(&ioc->hostdiag_unlock_mutex);
+	if (mpt3sas_base_unlock_and_get_host_diagnostic(ioc, &host_diagnostic)) {
+		mutex_unlock(&ioc->hostdiag_unlock_mutex);
+		goto out;
+	}
 
 	hcb_size = ioc->base_readl(&ioc->chip->HCBSize);
 
@@ -8013,10 +8047,8 @@ _base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
 	drsprintk(ioc, ioc_info(ioc, "restart the adapter\n"));
 	writel(host_diagnostic & ~MPI2_DIAG_HOLD_IOC_RESET,
 	    &ioc->chip->HostDiagnostic);
-
-	drsprintk(ioc,
-		  ioc_info(ioc, "disable writes to the diagnostic register\n"));
-	writel(MPI2_WRSEQ_FLUSH_KEY_VALUE, &ioc->chip->WriteSequence);
+	mpt3sas_base_lock_host_diagnostic(ioc);
+	mutex_unlock(&ioc->hostdiag_unlock_mutex);
 
 	drsprintk(ioc, ioc_info(ioc, "Wait for FW to go to the READY state\n"));
 	ioc_state = _base_wait_on_iocstate(ioc, MPI2_IOC_STATE_READY, 20);
@@ -8034,6 +8066,7 @@ _base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
  out:
 	pci_cfg_access_unlock(ioc->pdev);
 	ioc_err(ioc, "diag reset: FAILED\n");
+	mutex_unlock(&ioc->hostdiag_unlock_mutex);
 	return -EFAULT;
 }
 
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h b/drivers/scsi/mpt3sas/mpt3sas_base.h
index 05364aa15ecd..73f2b243729e 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.h
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.h
@@ -1367,6 +1367,7 @@ struct MPT3SAS_ADAPTER {
 	u8		got_task_abort_from_ioctl;
 
 	struct mutex	reset_in_progress_mutex;
+	struct mutex    hostdiag_unlock_mutex;
 	spinlock_t	ioc_reset_in_progress_lock;
 	u8		ioc_link_reset_in_progress;
 
@@ -1791,6 +1792,9 @@ void mpt3sas_base_disable_msix(struct MPT3SAS_ADAPTER *ioc);
 int mpt3sas_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num);
 void mpt3sas_base_pause_mq_polling(struct MPT3SAS_ADAPTER *ioc);
 void mpt3sas_base_resume_mq_polling(struct MPT3SAS_ADAPTER *ioc);
+int mpt3sas_base_unlock_and_get_host_diagnostic(struct MPT3SAS_ADAPTER *ioc,
+	u32 *host_diagnostic);
+void mpt3sas_base_lock_host_diagnostic(struct MPT3SAS_ADAPTER *ioc);
 
 /* scsih shared API */
 struct scsi_cmnd *mpt3sas_scsih_scsi_lookup_get(struct MPT3SAS_ADAPTER *ioc,
diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.c b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
index efdb8178db32..4a250ec0d6b9 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_ctl.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
@@ -2543,6 +2543,56 @@ _ctl_addnl_diag_query(struct MPT3SAS_ADAPTER *ioc, void __user *arg)
 	return 0;
 }
 
+/**
+ * _ctl_enable_diag_sbr_reload - enable sbr reload bit
+ * @ioc: per adapter object
+ * @arg - user space buffer containing ioctl content
+ *
+ * Enable the SBR reload bit
+ */
+static int
+_ctl_enable_diag_sbr_reload(struct MPT3SAS_ADAPTER *ioc, void __user *arg)
+{
+	u32 ioc_state, host_diagnostic;
+
+	if (ioc->shost_recovery ||
+	    ioc->pci_error_recovery || ioc->is_driver_loading ||
+	    ioc->remove_host)
+		return -EAGAIN;
+
+	ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
+
+	if (ioc_state != MPI2_IOC_STATE_OPERATIONAL)
+		return -EFAULT;
+
+	host_diagnostic = ioc->base_readl(&ioc->chip->HostDiagnostic);
+
+	if (host_diagnostic & MPI2_DIAG_SBR_RELOAD)
+		return 0;
+
+	if (mutex_trylock(&ioc->hostdiag_unlock_mutex)) {
+		if (mpt3sas_base_unlock_and_get_host_diagnostic(ioc, &host_diagnostic)) {
+			mutex_unlock(&ioc->hostdiag_unlock_mutex);
+				return -EFAULT;
+		}
+	} else
+		return -EAGAIN;
+
+	host_diagnostic |= MPI2_DIAG_SBR_RELOAD;
+	writel(host_diagnostic, &ioc->chip->HostDiagnostic);
+	host_diagnostic = ioc->base_readl(&ioc->chip->HostDiagnostic);
+	mpt3sas_base_lock_host_diagnostic(ioc);
+	mutex_unlock(&ioc->hostdiag_unlock_mutex);
+
+	if (!(host_diagnostic & MPI2_DIAG_SBR_RELOAD)) {
+		ioc_err(ioc, "%s: Failed to set Diag SBR Reload Bit\n", __func__);
+		return -EFAULT;
+	}
+
+	ioc_info(ioc, "%s: Successfully set the Diag SBR Reload Bit\n", __func__);
+	return 0;
+}
+
 #ifdef CONFIG_COMPAT
 /**
  * _ctl_compat_mpt_command - convert 32bit pointers to 64bit.
@@ -2719,6 +2769,10 @@ _ctl_ioctl_main(struct file *file, unsigned int cmd, void __user *arg,
 		if (_IOC_SIZE(cmd) == sizeof(struct mpt3_addnl_diag_query))
 			ret = _ctl_addnl_diag_query(ioc, arg);
 		break;
+	case MPT3ENABLEDIAGSBRRELOAD:
+		if (_IOC_SIZE(cmd) == sizeof(struct mpt3_enable_diag_sbr_reload))
+			ret = _ctl_enable_diag_sbr_reload(ioc, arg);
+		break;
 	default:
 		dctlprintk(ioc,
 			   ioc_info(ioc, "unsupported ioctl opcode(0x%08x)\n",
diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.h b/drivers/scsi/mpt3sas/mpt3sas_ctl.h
index 8f6ffb40261c..171709e91006 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_ctl.h
+++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.h
@@ -98,6 +98,8 @@
 	struct mpt3_diag_read_buffer)
 #define MPT3ADDNLDIAGQUERY _IOWR(MPT3_MAGIC_NUMBER, 32, \
 	struct mpt3_addnl_diag_query)
+#define MPT3ENABLEDIAGSBRRELOAD _IOWR(MPT3_MAGIC_NUMBER, 33, \
+	struct mpt3_enable_diag_sbr_reload)
 
 /* Trace Buffer default UniqueId */
 #define MPT2DIAGBUFFUNIQUEID (0x07075900)
@@ -448,4 +450,12 @@ struct mpt3_addnl_diag_query {
 	uint32_t reserved2[2];
 };
 
+/**
+ * struct mpt3_enable_diag_sbr_reload - enable sbr reload
+ * @hdr - generic header
+ */
+struct mpt3_enable_diag_sbr_reload {
+	struct mpt3_ioctl_header hdr;
+};
+
 #endif /* MPT3SAS_CTL_H_INCLUDED */
diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index 8e24ebcebfe5..61d17c6400a8 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -12259,6 +12259,7 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	/* misc semaphores and spin locks */
 	mutex_init(&ioc->reset_in_progress_mutex);
+	mutex_init(&ioc->hostdiag_unlock_mutex);
 	/* initializing pci_access_mutex lock */
 	mutex_init(&ioc->pci_access_mutex);
 	spin_lock_init(&ioc->ioc_reset_in_progress_lock);
-- 
2.31.1


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