[#upstream] libata: export ata_port port_no attribute via /sys

While registering host controller track port number based upon number
of ports available on the controller, export port_no attribute through
/sys.

# pwd
/sys/devices/pci0000:00/0000:00:1f.2/ata8/ata_port/ata8
# ll
total 0
lrwxrwxrwx. 1 root root    0 Mar  6 12:43 device -> ../../../ata8
-r--r--r--. 1 root root 4096 Mar  6 12:43 idle_irq
-r--r--r--. 1 root root 4096 Mar  6 12:43 nr_pmp_links
-r--r--r--. 1 root root 4096 Mar  6 12:43 port_no
drwxr-xr-x. 2 root root    0 Mar  6 12:42 power
lrwxrwxrwx. 1 root root    0 Mar  6 12:41 subsystem -> ../../../../../../class/ata_port
-rw-r--r--. 1 root root 4096 Mar  6 12:40 uevent
# cat port_no
1

Signed-off-by: David Milburn <dmilburn@redhat.com>
---
 drivers/ata/libata-core.c      |    6 ++++--
 drivers/ata/libata-transport.c |    4 +++-
 include/linux/libata.h         |    1 +
 3 files changed, 8 insertions(+), 3 deletions(-)

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David Milburn wrote:
> While registering host controller track port number based upon number
> of ports available on the controller, export port_no attribute through
> /sys.
> 
> # pwd
> /sys/devices/pci0000:00/0000:00:1f.2/ata8/ata_port/ata8
> # ll
> total 0
> lrwxrwxrwx. 1 root root    0 Mar  6 12:43 device -> ../../../ata8
> -r--r--r--. 1 root root 4096 Mar  6 12:43 idle_irq
> -r--r--r--. 1 root root 4096 Mar  6 12:43 nr_pmp_links
> -r--r--r--. 1 root root 4096 Mar  6 12:43 port_no
> drwxr-xr-x. 2 root root    0 Mar  6 12:42 power
> lrwxrwxrwx. 1 root root    0 Mar  6 12:41 subsystem -> ../../../../../../class/ata_port
> -rw-r--r--. 1 root root 4096 Mar  6 12:40 uevent
> # cat port_no
> 1
> 
> Signed-off-by: David Milburn <dmilburn@redhat.com>
> ---
>  drivers/ata/libata-core.c      |    6 ++++--
>  drivers/ata/libata-transport.c |    4 +++-
>  include/linux/libata.h         |    1 +
>  3 files changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
> index 497adea..82135b1 100644
> --- a/drivers/ata/libata-core.c
> +++ b/drivers/ata/libata-core.c
> @@ -5632,6 +5632,7 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
>  	ap->pflags |= ATA_PFLAG_INITIALIZING | ATA_PFLAG_FROZEN;
>  	ap->lock = &host->lock;
>  	ap->print_id = -1;
> +	ap->local_port_no = -1;
>  	ap->host = host;
>  	ap->dev = host->dev;
>  
> @@ -6122,9 +6123,10 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
>  		kfree(host->ports[i]);
>  
>  	/* give ports names and add SCSI hosts */
> -	for (i = 0; i < host->n_ports; i++)
> +	for (i = 0; i < host->n_ports; i++) {
>  		host->ports[i]->print_id = atomic_inc_return(&ata_print_id);
> -
> +		host->ports[i]->local_port_no = i + 1;
> +	}
>  
>  	/* Create associated sysfs transport objects  */
>  	for (i = 0; i < host->n_ports; i++) {
> diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c
> index c04d393..077a856 100644
> --- a/drivers/ata/libata-transport.c
> +++ b/drivers/ata/libata-transport.c
> @@ -37,7 +37,7 @@
>  #include "libata.h"
>  #include "libata-transport.h"
>  
> -#define ATA_PORT_ATTRS		2
> +#define ATA_PORT_ATTRS		3
>  #define ATA_LINK_ATTRS		3
>  #define ATA_DEV_ATTRS		9
>  
> @@ -216,6 +216,7 @@ static DEVICE_ATTR(name, S_IRUGO, show_ata_port_##name, NULL)
>  
>  ata_port_simple_attr(nr_pmp_links, nr_pmp_links, "%d\n", int);
>  ata_port_simple_attr(stats.idle_irq, idle_irq, "%ld\n", unsigned long);
> +ata_port_simple_attr(local_port_no, port_no, "%u\n", unsigned int);
>  
>  static DECLARE_TRANSPORT_CLASS(ata_port_class,
>  			       "ata_port", NULL, NULL, NULL);
> @@ -709,6 +710,7 @@ struct scsi_transport_template *ata_attach_transport(void)
>  	count = 0;
>  	SETUP_PORT_ATTRIBUTE(nr_pmp_links);
>  	SETUP_PORT_ATTRIBUTE(idle_irq);
> +	SETUP_PORT_ATTRIBUTE(port_no);
>  	BUG_ON(count > ATA_PORT_ATTRS);
>  	i->port_attrs[count] = NULL;
>  
> diff --git a/include/linux/libata.h b/include/linux/libata.h
> index 91c9d10..6eece8b 100644
> --- a/include/linux/libata.h
> +++ b/include/linux/libata.h
> @@ -745,6 +745,7 @@ struct ata_port {
>  	/* Flags that change dynamically, protected by ap->lock */
>  	unsigned int		pflags; /* ATA_PFLAG_xxx */
>  	unsigned int		print_id; /* user visible unique port ID */
> +	unsigned int            local_port_no; /* host local port num */
>  	unsigned int		port_no; /* 0 based port no. inside the host */
>  
>  #ifdef CONFIG_ATA_SFF
> --

Hi Jeff,

Would you consider this patch for 3.10?

Thanks,
David

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