[PATCH 1/2] cciss: Adds simple mode functionality

[PATCH 1/2] cciss: Adds simple mode functionality

[Joe Handzik]

From: Joseph Handzik <joseph.t.handzik@beardog.cce.hp.com>

Signed-off-by: Joseph Handzik <joseph.t.handzik@beardog.cce.hp.com>
---
 Documentation/blockdev/cciss.txt |   10 +++++++
 drivers/block/cciss.c            |   56 +++++++++++++++++++++++++++++++-------
 drivers/block/cciss.h            |    1 +
 3 files changed, 56 insertions(+), 11 deletions(-)

diff --git a/Documentation/blockdev/cciss.txt b/Documentation/blockdev/cciss.txt
index c00c6a5..71464e0 100644
--- a/Documentation/blockdev/cciss.txt
+++ b/Documentation/blockdev/cciss.txt
@@ -78,6 +78,16 @@ The device naming scheme is:
 /dev/cciss/c1d1p2		Controller 1, disk 1, partition 2
 /dev/cciss/c1d1p3		Controller 1, disk 1, partition 3
 
+CCISS simple mode support
+-------------------------
+
+The "cciss_simple_mode=1" boot parameter may be used to prevent the driver
+from putting the controller into "performant" mode. The difference is that
+with simple mode, each command completion requires an interrupt, while with
+"performant mode" (the default, and ordinarily better performing) it is
+possible to have multiple command completions indicated by a single
+interrupt.
+
 SCSI tape drive and medium changer support
 ------------------------------------------
 
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 8f4ef65..61f0b5b 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -68,6 +68,10 @@ static int cciss_tape_cmds = 6;
 module_param(cciss_tape_cmds, int, 0644);
 MODULE_PARM_DESC(cciss_tape_cmds,
 	"number of commands to allocate for tape devices (default: 6)");
+static int cciss_simple_mode;
+module_param(cciss_simple_mode, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(cciss_simple_mode,
+	"Use 'simple mode' rather than 'performant mode'");
 
 static DEFINE_MUTEX(cciss_mutex);
 static struct proc_dir_entry *proc_cciss;
@@ -176,6 +180,7 @@ static void cciss_geometry_inquiry(ctlr_info_t *h, int logvol,
 			unsigned int block_size, InquiryData_struct *inq_buff,
 				   drive_info_struct *drv);
 static void __devinit cciss_interrupt_mode(ctlr_info_t *);
+static int __devinit cciss_enter_simple_mode(struct ctlr_info *h);
 static void start_io(ctlr_info_t *h);
 static int sendcmd_withirq(ctlr_info_t *h, __u8 cmd, void *buff, size_t size,
 			__u8 page_code, unsigned char scsi3addr[],
@@ -388,7 +393,7 @@ static void cciss_seq_show_header(struct seq_file *seq)
 		h->product_name,
 		(unsigned long)h->board_id,
 		h->firm_ver[0], h->firm_ver[1], h->firm_ver[2],
-		h->firm_ver[3], (unsigned int)h->intr[PERF_MODE_INT],
+		h->firm_ver[3], (unsigned int)h->intr[h->intr_mode],
 		h->num_luns,
 		h->Qdepth, h->commands_outstanding,
 		h->maxQsinceinit, h->max_outstanding, h->maxSG);
@@ -3984,6 +3989,9 @@ static void __devinit cciss_put_controller_into_performant_mode(ctlr_info_t *h)
 {
 	__u32 trans_support;
 
+	if (cciss_simple_mode)
+		return;
+
 	dev_dbg(&h->pdev->dev, "Trying to put board into Performant mode\n");
 	/* Attempt to put controller into performant mode if supported */
 	/* Does board support performant mode? */
@@ -4081,7 +4089,7 @@ static void __devinit cciss_interrupt_mode(ctlr_info_t *h)
 default_int_mode:
 #endif				/* CONFIG_PCI_MSI */
 	/* if we get here we're going to use the default interrupt mode */
-	h->intr[PERF_MODE_INT] = h->pdev->irq;
+	h->intr[h->intr_mode] = h->pdev->irq;
 	return;
 }
 
@@ -4341,6 +4349,9 @@ static int __devinit cciss_pci_init(ctlr_info_t *h)
 	}
 	cciss_enable_scsi_prefetch(h);
 	cciss_p600_dma_prefetch_quirk(h);
+	err = cciss_enter_simple_mode(h);
+	if (err)
+		goto err_out_free_res;
 	cciss_put_controller_into_performant_mode(h);
 	return 0;
 
@@ -4843,20 +4854,20 @@ static int cciss_request_irq(ctlr_info_t *h,
 	irqreturn_t (*intxhandler)(int, void *))
 {
 	if (h->msix_vector || h->msi_vector) {
-		if (!request_irq(h->intr[PERF_MODE_INT], msixhandler,
+		if (!request_irq(h->intr[h->intr_mode], msixhandler,
 				IRQF_DISABLED, h->devname, h))
 			return 0;
 		dev_err(&h->pdev->dev, "Unable to get msi irq %d"
-			" for %s\n", h->intr[PERF_MODE_INT],
+			" for %s\n", h->intr[h->intr_mode],
 			h->devname);
 		return -1;
 	}
 
-	if (!request_irq(h->intr[PERF_MODE_INT], intxhandler,
+	if (!request_irq(h->intr[h->intr_mode], intxhandler,
 			IRQF_DISABLED, h->devname, h))
 		return 0;
 	dev_err(&h->pdev->dev, "Unable to get irq %d for %s\n",
-		h->intr[PERF_MODE_INT], h->devname);
+		h->intr[h->intr_mode], h->devname);
 	return -1;
 }
 
@@ -4887,7 +4898,7 @@ static void cciss_undo_allocations_after_kdump_soft_reset(ctlr_info_t *h)
 {
 	int ctlr = h->ctlr;
 
-	free_irq(h->intr[PERF_MODE_INT], h);
+	free_irq(h->intr[h->intr_mode], h);
 #ifdef CONFIG_PCI_MSI
 	if (h->msix_vector)
 		pci_disable_msix(h->pdev);
@@ -4953,6 +4964,7 @@ reinit_after_soft_reset:
 	h = hba[i];
 	h->pdev = pdev;
 	h->busy_initializing = 1;
+	h->intr_mode = cciss_simple_mode ? SIMPLE_MODE_INT : PERF_MODE_INT;
 	INIT_LIST_HEAD(&h->cmpQ);
 	INIT_LIST_HEAD(&h->reqQ);
 	mutex_init(&h->busy_shutting_down);
@@ -5009,7 +5021,7 @@ reinit_after_soft_reset:
 
 	dev_info(&h->pdev->dev, "%s: <0x%x> at PCI %s IRQ %d%s using DAC\n",
 	       h->devname, pdev->device, pci_name(pdev),
-	       h->intr[PERF_MODE_INT], dac ? "" : " not");
+	       h->intr[h->intr_mode], dac ? "" : " not");
 
 	if (cciss_allocate_cmd_pool(h))
 		goto clean4;
@@ -5056,7 +5068,7 @@ reinit_after_soft_reset:
 		spin_lock_irqsave(&h->lock, flags);
 		h->access.set_intr_mask(h, CCISS_INTR_OFF);
 		spin_unlock_irqrestore(&h->lock, flags);
-		free_irq(h->intr[PERF_MODE_INT], h);
+		free_irq(h->intr[h->intr_mode], h);
 		rc = cciss_request_irq(h, cciss_msix_discard_completions,
 					cciss_intx_discard_completions);
 		if (rc) {
@@ -5133,7 +5145,7 @@ clean4:
 	cciss_free_cmd_pool(h);
 	cciss_free_scatterlists(h);
 	cciss_free_sg_chain_blocks(h->cmd_sg_list, h->nr_cmds);
-	free_irq(h->intr[PERF_MODE_INT], h);
+	free_irq(h->intr[h->intr_mode], h);
 clean2:
 	unregister_blkdev(h->major, h->devname);
 clean1:
@@ -5172,9 +5184,31 @@ static void cciss_shutdown(struct pci_dev *pdev)
 	if (return_code != IO_OK)
 		dev_warn(&h->pdev->dev, "Error flushing cache\n");
 	h->access.set_intr_mask(h, CCISS_INTR_OFF);
-	free_irq(h->intr[PERF_MODE_INT], h);
+	free_irq(h->intr[h->intr_mode], h);
 }
 
+static int __devinit cciss_enter_simple_mode(struct ctlr_info *h)
+{
+	u32 trans_support;
+
+	trans_support = readl(&(h->cfgtable->TransportSupport));
+	if (!(trans_support & SIMPLE_MODE))
+		return -ENOTSUPP;
+
+	h->max_commands = readl(&(h->cfgtable->CmdsOutMax));
+	writel(CFGTBL_Trans_Simple, &(h->cfgtable->HostWrite.TransportRequest));
+	writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
+	cciss_wait_for_mode_change_ack(h);
+	print_cfg_table(h);
+	if (!(readl(&(h->cfgtable->TransportActive)) & CFGTBL_Trans_Simple)) {
+		dev_warn(&h->pdev->dev, "unable to get board into simple mode\n");
+		return -ENODEV;
+	}
+	h->transMethod = CFGTBL_Trans_Simple;
+	return 0;
+}
+
+
 static void __devexit cciss_remove_one(struct pci_dev *pdev)
 {
 	ctlr_info_t *h;
diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
index 16b4d58..166fcd0 100644
--- a/drivers/block/cciss.h
+++ b/drivers/block/cciss.h
@@ -92,6 +92,7 @@ struct ctlr_info
 	unsigned int intr[4];
 	unsigned int msix_vector;
 	unsigned int msi_vector;
+	int	intr_mode;
 	int 	cciss_max_sectors;
 	BYTE	cciss_read;
 	BYTE	cciss_write;

[PATCH 2/2] cciss: add transport mode attribute to sys

[Joe Handzik]

From: Joseph Handzik <joseph.t.handzik@beardog.cce.hp.com>

Signed-off-by: Joseph Handzik <joseph.t.handzik@beardog.cce.hp.com>
---
 .../ABI/testing/sysfs-bus-pci-devices-cciss        |    7 +++++++
 drivers/block/cciss.c                              |   13 +++++++++++++
 2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss b/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
index f5bb0a3..53d99ed 100644
--- a/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
+++ b/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
@@ -71,3 +71,10 @@ Description:	Value of 1 indicates the controller can honor the reset_devices
 		a dump device, as kdump requires resetting the device in order
 		to work reliably.
 
+Where:		/sys/bus/pci/devices/<dev>/ccissX/transport_mode
+Date:		July 2011
+Kernel Version:	3.0
+Contact:	iss_storagedev@hp.com
+Description:	Value of "simple" indicates that the controller has been placed
+		in "simple mode". Value of "performant" indicates that the
+		controller has been placed in "performant mode".
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 61f0b5b..6da7ede 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -641,6 +641,18 @@ static ssize_t host_store_rescan(struct device *dev,
 }
 static DEVICE_ATTR(rescan, S_IWUSR, NULL, host_store_rescan);
 
+static ssize_t host_show_transport_mode(struct device *dev,
+				 struct device_attribute *attr,
+				 char *buf)
+{
+	struct ctlr_info *h = to_hba(dev);
+
+	return snprintf(buf, 20, "%s\n",
+		h->transMethod & CFGTBL_Trans_Performant ?
+			"performant" : "simple");
+}
+static DEVICE_ATTR(transport_mode, S_IRUGO, host_show_transport_mode, NULL);
+
 static ssize_t dev_show_unique_id(struct device *dev,
 				 struct device_attribute *attr,
 				 char *buf)
@@ -813,6 +825,7 @@ static DEVICE_ATTR(usage_count, S_IRUGO, cciss_show_usage_count, NULL);
 static struct attribute *cciss_host_attrs[] = {
 	&dev_attr_rescan.attr,
 	&dev_attr_resettable.attr,
+	&dev_attr_transport_mode.attr,
 	NULL
 };
 

Re: [PATCH 1/2] cciss: Adds simple mode functionality

[scameron]

On Wed, Jul 27, 2011 at 04:38:30PM -0500, Joe Handzik wrote:
> From: Joseph Handzik <joseph.t.handzik@beardog.cce.hp.com>
> 
> Signed-off-by: Joseph Handzik <joseph.t.handzik@beardog.cce.hp.com>

Looks ok to me.  Ack.

-- steve

> ---
>  Documentation/blockdev/cciss.txt |   10 +++++++
>  drivers/block/cciss.c            |   56 +++++++++++++++++++++++++++++++-------
>  drivers/block/cciss.h            |    1 +
>  3 files changed, 56 insertions(+), 11 deletions(-)
> 
> diff --git a/Documentation/blockdev/cciss.txt b/Documentation/blockdev/cciss.txt
> index c00c6a5..71464e0 100644
> --- a/Documentation/blockdev/cciss.txt
> +++ b/Documentation/blockdev/cciss.txt
> @@ -78,6 +78,16 @@ The device naming scheme is:
>  /dev/cciss/c1d1p2		Controller 1, disk 1, partition 2
>  /dev/cciss/c1d1p3		Controller 1, disk 1, partition 3
>  
> +CCISS simple mode support
> +-------------------------
> +
> +The "cciss_simple_mode=1" boot parameter may be used to prevent the driver
> +from putting the controller into "performant" mode. The difference is that
> +with simple mode, each command completion requires an interrupt, while with
> +"performant mode" (the default, and ordinarily better performing) it is
> +possible to have multiple command completions indicated by a single
> +interrupt.
> +
>  SCSI tape drive and medium changer support
>  ------------------------------------------
>  
> diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
> index 8f4ef65..61f0b5b 100644
> --- a/drivers/block/cciss.c
> +++ b/drivers/block/cciss.c
> @@ -68,6 +68,10 @@ static int cciss_tape_cmds = 6;
>  module_param(cciss_tape_cmds, int, 0644);
>  MODULE_PARM_DESC(cciss_tape_cmds,
>  	"number of commands to allocate for tape devices (default: 6)");
> +static int cciss_simple_mode;
> +module_param(cciss_simple_mode, int, S_IRUGO|S_IWUSR);
> +MODULE_PARM_DESC(cciss_simple_mode,
> +	"Use 'simple mode' rather than 'performant mode'");
>  
>  static DEFINE_MUTEX(cciss_mutex);
>  static struct proc_dir_entry *proc_cciss;
> @@ -176,6 +180,7 @@ static void cciss_geometry_inquiry(ctlr_info_t *h, int logvol,
>  			unsigned int block_size, InquiryData_struct *inq_buff,
>  				   drive_info_struct *drv);
>  static void __devinit cciss_interrupt_mode(ctlr_info_t *);
> +static int __devinit cciss_enter_simple_mode(struct ctlr_info *h);
>  static void start_io(ctlr_info_t *h);
>  static int sendcmd_withirq(ctlr_info_t *h, __u8 cmd, void *buff, size_t size,
>  			__u8 page_code, unsigned char scsi3addr[],
> @@ -388,7 +393,7 @@ static void cciss_seq_show_header(struct seq_file *seq)
>  		h->product_name,
>  		(unsigned long)h->board_id,
>  		h->firm_ver[0], h->firm_ver[1], h->firm_ver[2],
> -		h->firm_ver[3], (unsigned int)h->intr[PERF_MODE_INT],
> +		h->firm_ver[3], (unsigned int)h->intr[h->intr_mode],
>  		h->num_luns,
>  		h->Qdepth, h->commands_outstanding,
>  		h->maxQsinceinit, h->max_outstanding, h->maxSG);
> @@ -3984,6 +3989,9 @@ static void __devinit cciss_put_controller_into_performant_mode(ctlr_info_t *h)
>  {
>  	__u32 trans_support;
>  
> +	if (cciss_simple_mode)
> +		return;
> +
>  	dev_dbg(&h->pdev->dev, "Trying to put board into Performant mode\n");
>  	/* Attempt to put controller into performant mode if supported */
>  	/* Does board support performant mode? */
> @@ -4081,7 +4089,7 @@ static void __devinit cciss_interrupt_mode(ctlr_info_t *h)
>  default_int_mode:
>  #endif				/* CONFIG_PCI_MSI */
>  	/* if we get here we're going to use the default interrupt mode */
> -	h->intr[PERF_MODE_INT] = h->pdev->irq;
> +	h->intr[h->intr_mode] = h->pdev->irq;
>  	return;
>  }
>  
> @@ -4341,6 +4349,9 @@ static int __devinit cciss_pci_init(ctlr_info_t *h)
>  	}
>  	cciss_enable_scsi_prefetch(h);
>  	cciss_p600_dma_prefetch_quirk(h);
> +	err = cciss_enter_simple_mode(h);
> +	if (err)
> +		goto err_out_free_res;
>  	cciss_put_controller_into_performant_mode(h);
>  	return 0;
>  
> @@ -4843,20 +4854,20 @@ static int cciss_request_irq(ctlr_info_t *h,
>  	irqreturn_t (*intxhandler)(int, void *))
>  {
>  	if (h->msix_vector || h->msi_vector) {
> -		if (!request_irq(h->intr[PERF_MODE_INT], msixhandler,
> +		if (!request_irq(h->intr[h->intr_mode], msixhandler,
>  				IRQF_DISABLED, h->devname, h))
>  			return 0;
>  		dev_err(&h->pdev->dev, "Unable to get msi irq %d"
> -			" for %s\n", h->intr[PERF_MODE_INT],
> +			" for %s\n", h->intr[h->intr_mode],
>  			h->devname);
>  		return -1;
>  	}
>  
> -	if (!request_irq(h->intr[PERF_MODE_INT], intxhandler,
> +	if (!request_irq(h->intr[h->intr_mode], intxhandler,
>  			IRQF_DISABLED, h->devname, h))
>  		return 0;
>  	dev_err(&h->pdev->dev, "Unable to get irq %d for %s\n",
> -		h->intr[PERF_MODE_INT], h->devname);
> +		h->intr[h->intr_mode], h->devname);
>  	return -1;
>  }
>  
> @@ -4887,7 +4898,7 @@ static void cciss_undo_allocations_after_kdump_soft_reset(ctlr_info_t *h)
>  {
>  	int ctlr = h->ctlr;
>  
> -	free_irq(h->intr[PERF_MODE_INT], h);
> +	free_irq(h->intr[h->intr_mode], h);
>  #ifdef CONFIG_PCI_MSI
>  	if (h->msix_vector)
>  		pci_disable_msix(h->pdev);
> @@ -4953,6 +4964,7 @@ reinit_after_soft_reset:
>  	h = hba[i];
>  	h->pdev = pdev;
>  	h->busy_initializing = 1;
> +	h->intr_mode = cciss_simple_mode ? SIMPLE_MODE_INT : PERF_MODE_INT;
>  	INIT_LIST_HEAD(&h->cmpQ);
>  	INIT_LIST_HEAD(&h->reqQ);
>  	mutex_init(&h->busy_shutting_down);
> @@ -5009,7 +5021,7 @@ reinit_after_soft_reset:
>  
>  	dev_info(&h->pdev->dev, "%s: <0x%x> at PCI %s IRQ %d%s using DAC\n",
>  	       h->devname, pdev->device, pci_name(pdev),
> -	       h->intr[PERF_MODE_INT], dac ? "" : " not");
> +	       h->intr[h->intr_mode], dac ? "" : " not");
>  
>  	if (cciss_allocate_cmd_pool(h))
>  		goto clean4;
> @@ -5056,7 +5068,7 @@ reinit_after_soft_reset:
>  		spin_lock_irqsave(&h->lock, flags);
>  		h->access.set_intr_mask(h, CCISS_INTR_OFF);
>  		spin_unlock_irqrestore(&h->lock, flags);
> -		free_irq(h->intr[PERF_MODE_INT], h);
> +		free_irq(h->intr[h->intr_mode], h);
>  		rc = cciss_request_irq(h, cciss_msix_discard_completions,
>  					cciss_intx_discard_completions);
>  		if (rc) {
> @@ -5133,7 +5145,7 @@ clean4:
>  	cciss_free_cmd_pool(h);
>  	cciss_free_scatterlists(h);
>  	cciss_free_sg_chain_blocks(h->cmd_sg_list, h->nr_cmds);
> -	free_irq(h->intr[PERF_MODE_INT], h);
> +	free_irq(h->intr[h->intr_mode], h);
>  clean2:
>  	unregister_blkdev(h->major, h->devname);
>  clean1:
> @@ -5172,9 +5184,31 @@ static void cciss_shutdown(struct pci_dev *pdev)
>  	if (return_code != IO_OK)
>  		dev_warn(&h->pdev->dev, "Error flushing cache\n");
>  	h->access.set_intr_mask(h, CCISS_INTR_OFF);
> -	free_irq(h->intr[PERF_MODE_INT], h);
> +	free_irq(h->intr[h->intr_mode], h);
>  }
>  
> +static int __devinit cciss_enter_simple_mode(struct ctlr_info *h)
> +{
> +	u32 trans_support;
> +
> +	trans_support = readl(&(h->cfgtable->TransportSupport));
> +	if (!(trans_support & SIMPLE_MODE))
> +		return -ENOTSUPP;
> +
> +	h->max_commands = readl(&(h->cfgtable->CmdsOutMax));
> +	writel(CFGTBL_Trans_Simple, &(h->cfgtable->HostWrite.TransportRequest));
> +	writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
> +	cciss_wait_for_mode_change_ack(h);
> +	print_cfg_table(h);
> +	if (!(readl(&(h->cfgtable->TransportActive)) & CFGTBL_Trans_Simple)) {
> +		dev_warn(&h->pdev->dev, "unable to get board into simple mode\n");
> +		return -ENODEV;
> +	}
> +	h->transMethod = CFGTBL_Trans_Simple;
> +	return 0;
> +}
> +
> +
>  static void __devexit cciss_remove_one(struct pci_dev *pdev)
>  {
>  	ctlr_info_t *h;
> diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
> index 16b4d58..166fcd0 100644
> --- a/drivers/block/cciss.h
> +++ b/drivers/block/cciss.h
> @@ -92,6 +92,7 @@ struct ctlr_info
>  	unsigned int intr[4];
>  	unsigned int msix_vector;
>  	unsigned int msi_vector;
> +	int	intr_mode;
>  	int 	cciss_max_sectors;
>  	BYTE	cciss_read;
>  	BYTE	cciss_write;

Re: [PATCH 2/2] cciss: add transport mode attribute to sys

[scameron]

On Wed, Jul 27, 2011 at 04:38:36PM -0500, Joe Handzik wrote:
> From: Joseph Handzik <joseph.t.handzik@beardog.cce.hp.com>
> 
> Signed-off-by: Joseph Handzik <joseph.t.handzik@beardog.cce.hp.com>

looks ok to me.  Ack.

-- steve

> ---
>  .../ABI/testing/sysfs-bus-pci-devices-cciss        |    7 +++++++
>  drivers/block/cciss.c                              |   13 +++++++++++++
>  2 files changed, 20 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss b/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
> index f5bb0a3..53d99ed 100644
> --- a/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
> +++ b/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
> @@ -71,3 +71,10 @@ Description:	Value of 1 indicates the controller can honor the reset_devices
>  		a dump device, as kdump requires resetting the device in order
>  		to work reliably.
>  
> +Where:		/sys/bus/pci/devices/<dev>/ccissX/transport_mode
> +Date:		July 2011
> +Kernel Version:	3.0
> +Contact:	iss_storagedev@hp.com
> +Description:	Value of "simple" indicates that the controller has been placed
> +		in "simple mode". Value of "performant" indicates that the
> +		controller has been placed in "performant mode".
> diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
> index 61f0b5b..6da7ede 100644
> --- a/drivers/block/cciss.c
> +++ b/drivers/block/cciss.c
> @@ -641,6 +641,18 @@ static ssize_t host_store_rescan(struct device *dev,
>  }
>  static DEVICE_ATTR(rescan, S_IWUSR, NULL, host_store_rescan);
>  
> +static ssize_t host_show_transport_mode(struct device *dev,
> +				 struct device_attribute *attr,
> +				 char *buf)
> +{
> +	struct ctlr_info *h = to_hba(dev);
> +
> +	return snprintf(buf, 20, "%s\n",
> +		h->transMethod & CFGTBL_Trans_Performant ?
> +			"performant" : "simple");
> +}
> +static DEVICE_ATTR(transport_mode, S_IRUGO, host_show_transport_mode, NULL);
> +
>  static ssize_t dev_show_unique_id(struct device *dev,
>  				 struct device_attribute *attr,
>  				 char *buf)
> @@ -813,6 +825,7 @@ static DEVICE_ATTR(usage_count, S_IRUGO, cciss_show_usage_count, NULL);
>  static struct attribute *cciss_host_attrs[] = {
>  	&dev_attr_rescan.attr,
>  	&dev_attr_resettable.attr,
> +	&dev_attr_transport_mode.attr,
>  	NULL
>  };
>  

Re: [PATCH 1/2] cciss: Adds simple mode functionality

[Jens Axboe]

On 2011-07-27 23:38, Joe Handzik wrote:
> From: Joseph Handzik <joseph.t.handzik@beardog.cce.hp.com>

I'll add these for 3.2 with Stephens ack.

-- 
Jens Axboe