- 根目录:
- drivers
- ata
- libata-transport.c
/*
* Copyright 2008 ioogle, Inc. All rights reserved.
* Released under GPL v2.
*
* Libata transport class.
*
* The ATA transport class contains common code to deal with ATA HBAs,
* an approximated representation of ATA topologies in the driver model,
* and various sysfs attributes to expose these topologies and management
* interfaces to user-space.
*
* There are 3 objects defined in in this class:
* - ata_port
* - ata_link
* - ata_device
* Each port has a link object. Each link can have up to two devices for PATA
* and generally one for SATA.
* If there is SATA port multiplier [PMP], 15 additional ata_link object are
* created.
*
* These objects are created when the ata host is initialized and when a PMP is
* found. They are removed only when the HBA is removed, cleaned before the
* error handler runs.
*/
#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <scsi/scsi_transport.h>
#include <linux/libata.h>
#include <linux/hdreg.h>
#include <linux/uaccess.h>
#include "libata.h"
#include "libata-transport.h"
#define ATA_PORT_ATTRS 2
#define ATA_LINK_ATTRS 3
#define ATA_DEV_ATTRS 9
struct scsi_transport_template;
struct scsi_transport_template *ata_scsi_transport_template;
struct ata_internal {
struct scsi_transport_template t;
struct device_attribute private_port_attrs[ATA_PORT_ATTRS];
struct device_attribute private_link_attrs[ATA_LINK_ATTRS];
struct device_attribute private_dev_attrs[ATA_DEV_ATTRS];
struct transport_container link_attr_cont;
struct transport_container dev_attr_cont;
/*
* The array of null terminated pointers to attributes
* needed by scsi_sysfs.c
*/
struct device_attribute *link_attrs[ATA_LINK_ATTRS + 1];
struct device_attribute *port_attrs[ATA_PORT_ATTRS + 1];
struct device_attribute *dev_attrs[ATA_DEV_ATTRS + 1];
};
#define to_ata_internal(tmpl) container_of(tmpl, struct ata_internal, t)
#define tdev_to_device(d) \
container_of((d), struct ata_device, tdev)
#define transport_class_to_dev(dev) \
tdev_to_device((dev)->parent)
#define tdev_to_link(d) \
container_of((d), struct ata_link, tdev)
#define transport_class_to_link(dev) \
tdev_to_link((dev)->parent)
#define tdev_to_port(d) \
container_of((d), struct ata_port, tdev)
#define transport_class_to_port(dev) \
tdev_to_port((dev)->parent)
/* Device objects are always created whit link objects */
static int ata_tdev_add(struct ata_device *dev);
static void ata_tdev_delete(struct ata_device *dev);
/*
* Hack to allow attributes of the same name in different objects.
*/
#define ATA_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
struct device_attribute device_attr_##_prefix##_##_name = \
__ATTR(_name,_mode,_show,_store)
#define ata_bitfield_name_match(title, table) \
static ssize_t \
get_ata_##title##_names(u32 table_key, char *buf) \
{ \
char *prefix = ""; \
ssize_t len = 0; \
int i; \
\
for (i = 0; i < ARRAY_SIZE(table); i++) { \
if (table[i].value & table_key) { \
len += sprintf(buf + len, "%s%s", \
prefix, table[i].name); \
prefix = ", "; \
} \
} \
len += sprintf(buf + len, "\n"); \
return len; \
}
#define ata_bitfield_name_search(title, table) \
static ssize_t \
get_ata_##title##_names(u32 table_key, char *buf) \
{ \
ssize_t len = 0; \
int i; \
\
for (i = 0; i < ARRAY_SIZE(table); i++) { \
if (table[i].value == table_key) { \
len += sprintf(buf + len, "%s", \
table[i].name); \
break; \
} \
} \
len += sprintf(buf + len, "\n"); \
return len; \
}
static struct {
u32 value;
char *name;
} ata_class_names[] = {
{ ATA_DEV_UNKNOWN, "unknown" },
{ ATA_DEV_ATA, "ata" },
{ ATA_DEV_ATA_UNSUP, "ata" },
{ ATA_DEV_ATAPI, "atapi" },
{ ATA_DEV_ATAPI_UNSUP, "atapi" },
{ ATA_DEV_PMP, "pmp" },
{ ATA_DEV_PMP_UNSUP, "pmp" },
{ ATA_DEV_SEMB, "semb" },
{ ATA_DEV_SEMB_UNSUP, "semb" },
{ ATA_DEV_NONE, "none" }
};
ata_bitfield_name_search(class, ata_class_names)
static struct {
u32 value;
char *name;
} ata_err_names[] = {
{ AC_ERR_DEV, "DeviceError" },
{ AC_ERR_HSM, "HostStateMachineError" },
{ AC_ERR_TIMEOUT, "Timeout" },
{ AC_ERR_MEDIA, "MediaError" },
{ AC_ERR_ATA_BUS, "BusError" },
{ AC_ERR_HOST_BUS, "HostBusError" },
{ AC_ERR_SYSTEM, "SystemError" },
{ AC_ERR_INVALID, "InvalidArg" },
{ AC_ERR_OTHER, "Unknown" },
{ AC_ERR_NODEV_HINT, "NoDeviceHint" },
{ AC_ERR_NCQ, "NCQError" }
};
ata_bitfield_name_match(err, ata_err_names)
static struct {
u32 value;
char *name;
} ata_xfer_names[] = {
{ XFER_UDMA_7, "XFER_UDMA_7" },
{ XFER_UDMA_6, "XFER_UDMA_6" },
{ XFER_UDMA_5, "XFER_UDMA_5" },
{ XFER_UDMA_4, "XFER_UDMA_4" },
{ XFER_UDMA_3, "XFER_UDMA_3" },
{ XFER_UDMA_2, "XFER_UDMA_2" },
{ XFER_UDMA_1, "XFER_UDMA_1" },
{ XFER_UDMA_0, "XFER_UDMA_0" },
{ XFER_MW_DMA_4, "XFER_MW_DMA_4" },
{ XFER_MW_DMA_3, "XFER_MW_DMA_3" },
{ XFER_MW_DMA_2, "XFER_MW_DMA_2" },
{ XFER_MW_DMA_1, "XFER_MW_DMA_1" },
{ XFER_MW_DMA_0, "XFER_MW_DMA_0" },
{ XFER_SW_DMA_2, "XFER_SW_DMA_2" },
{ XFER_SW_DMA_1, "XFER_SW_DMA_1" },
{ XFER_SW_DMA_0, "XFER_SW_DMA_0" },
{ XFER_PIO_6, "XFER_PIO_6" },
{ XFER_PIO_5, "XFER_PIO_5" },
{ XFER_PIO_4, "XFER_PIO_4" },
{ XFER_PIO_3, "XFER_PIO_3" },
{ XFER_PIO_2, "XFER_PIO_2" },
{ XFER_PIO_1, "XFER_PIO_1" },
{ XFER_PIO_0, "XFER_PIO_0" },
{ XFER_PIO_SLOW, "XFER_PIO_SLOW" }
};
ata_bitfield_name_match(xfer,ata_xfer_names)
/*
* ATA Port attributes
*/
#define ata_port_show_simple(field, name, format_string, cast) \
static ssize_t \
show_ata_port_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct ata_port *ap = transport_class_to_port(dev); \
\
return snprintf(buf, 20, format_string, cast ap->field); \
}
#define ata_port_simple_attr(field, name, format_string, type) \
ata_port_show_simple(field, name, format_string, (type)) \
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);
static DECLARE_TRANSPORT_CLASS(ata_port_class,
"ata_port", NULL, NULL, NULL);
static void ata_tport_release(struct device *dev)
{
put_device(dev->parent);
}
/**
* ata_is_port -- check if a struct device represents a ATA port
* @dev: device to check
*
* Returns:
* %1 if the device represents a ATA Port, %0 else
*/
int ata_is_port(const struct device *dev)
{
return dev->release == ata_tport_release;
}
static int ata_tport_match(struct attribute_container *cont,
struct device *dev)
{
if (!ata_is_port(dev))
return 0;
return &ata_scsi_transport_template->host_attrs.ac == cont;
}
/**
* ata_tport_delete -- remove ATA PORT
* @port: ATA PORT to remove
*
* Removes the specified ATA PORT. Remove the associated link as well.
*/
void ata_tport_delete(struct ata_port *ap)
{
struct device *dev = &ap->tdev;
ata_tlink_delete(&ap->link);
transport_remove_device(dev);
device_del(dev);
transport_destroy_device(dev);
put_device(dev);
}
/** ata_tport_add - initialize a transport ATA port structure
*
* : parent device
* @ap: existing ata_port structure
*
* Initialize a ATA port structure for sysfs. It will be added to the device
* tree below the device specified by which could be a PCI device.
*
* Returns %0 on success
*/
int ata_tport_add(struct device *parent,
struct ata_port *ap)
{
int error;
struct device *dev = &ap->tdev;
device_initialize(dev);
dev->parent = get_device(parent);
dev->release = ata_tport_release;
dev_set_name(dev, "ata%d", ap->print_id);
transport_setup_device(dev);
error = device_add(dev);
if (error) {
goto tport_err;
}
transport_add_device(dev);
transport_configure_device(dev);
error = ata_tlink_add(&ap->link);
if (error) {
goto tport_link_err;
}
return 0;
tport_link_err:
transport_remove_device(dev);
device_del(dev);
tport_err:
transport_destroy_device(dev);
put_device(dev);
return error;
}
/*
* ATA link attributes
*/
#define ata_link_show_linkspeed(field) \
static ssize_t \
show_ata_link_##field(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct ata_link *link = transport_class_to_link(dev); \
\
return sprintf(buf,"%s\n", sata_spd_string(fls(link->field))); \
}
#define ata_link_linkspeed_attr(field) \
ata_link_show_linkspeed(field) \
static DEVICE_ATTR(field, S_IRUGO, show_ata_link_##field, NULL)
ata_link_linkspeed_attr(hw_sata_spd_limit);
ata_link_linkspeed_attr(sata_spd_limit);
ata_link_linkspeed_attr(sata_spd);
static DECLARE_TRANSPORT_CLASS(ata_link_class,
"ata_link", NULL, NULL, NULL);
static void ata_tlink_release(struct device *dev)
{
put_device(dev->parent);
}
/**
* ata_is_link -- check if a struct device represents a ATA link
* @dev: device to check
*
* Returns:
* %1 if the device represents a ATA link, %0 else
*/
int ata_is_link(const struct device *dev)
{
return dev->release == ata_tlink_release;
}
static int ata_tlink_match(struct attribute_container *cont,
struct device *dev)
{
struct ata_internal* i = to_ata_internal(ata_scsi_transport_template);
if (!ata_is_link(dev))
return 0;
return &i->link_attr_cont.ac == cont;
}
/**
* ata_tlink_delete -- remove ATA LINK
* @port: ATA LINK to remove
*
* Removes the specified ATA LINK. remove associated ATA device(s) as well.
*/
void ata_tlink_delete(struct ata_link *link)
{
struct device *dev = &link->tdev;
struct ata_device *ata_dev;
ata_for_each_dev(ata_dev, link, ALL) {
ata_tdev_delete(ata_dev);
}
transport_remove_device(dev);
device_del(dev);
transport_destroy_device(dev);
put_device(dev);
}
/**
* ata_tlink_add -- initialize a transport ATA link structure
* @link: allocated ata_link structure.
*
* Initialize an ATA LINK structure for sysfs. It will be added in the
* device tree below the ATA PORT it belongs to.
*
* Returns %0 on success
*/
int ata_tlink_add(struct ata_link *link)
{
struct device *dev = &link->tdev;
struct ata_port *ap = link->ap;
struct ata_device *ata_dev;
int error;
device_initialize(dev);
dev->parent = get_device(&ap->tdev);
dev->release = ata_tlink_release;
if (ata_is_host_link(link))
dev_set_name(dev, "link%d", ap->print_id);
else
dev_set_name(dev, "link%d.%d", ap->print_id, link->pmp);
transport_setup_device(dev);
error = device_add(dev);
if (error) {
goto tlink_err;
}
transport_add_device(dev);
transport_configure_device(dev);
ata_for_each_dev(ata_dev, link, ALL) {
error = ata_tdev_add(ata_dev);
if (error) {
goto tlink_dev_err;
}
}
return 0;
tlink_dev_err:
while (--ata_dev >= link->device) {
ata_tdev_delete(ata_dev);
}
transport_remove_device(dev);
device_del(dev);
tlink_err:
transport_destroy_device(dev);
put_device(dev);
return error;
}
/*
* ATA device attributes
*/
#define ata_dev_show_class(title, field) \
static ssize_t \
show_ata_dev_##field(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct ata_device *ata_dev = transport_class_to_dev(dev); \
\
return get_ata_##title##_names(ata_dev->field, buf); \
}
#define ata_dev_attr(title, field) \
ata_dev_show_class(title, field) \
static DEVICE_ATTR(field, S_IRUGO, show_ata_dev_##field, NULL)
ata_dev_attr(class, class);
ata_dev_attr(xfer, pio_mode);
ata_dev_attr(xfer, dma_mode);
ata_dev_attr(xfer, xfer_mode);
#define ata_dev_show_simple(field, format_string, cast) \
static ssize_t \
show_ata_dev_##field(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct ata_device *ata_dev = transport_class_to_dev(dev); \
\
return snprintf(buf, 20, format_string, cast ata_dev->field); \
}
#define ata_dev_simple_attr(field, format_string, type) \
ata_dev_show_simple(field, format_string, (type)) \
static DEVICE_ATTR(field, S_IRUGO, \
show_ata_dev_##field, NULL)
ata_dev_simple_attr(spdn_cnt, "%d\n", int);
struct ata_show_ering_arg {
char* buf;
int written;
};
static int ata_show_ering(struct ata_ering_entry *ent, void *void_arg)
{
struct ata_show_ering_arg* arg = void_arg;
struct timespec time;
jiffies_to_timespec(ent->timestamp,&time);
arg->written += sprintf(arg->buf + arg->written,
"[%5lu.%06lu]",
time.tv_sec, time.tv_nsec);
arg->written += get_ata_err_names(ent->err_mask,
arg->buf + arg->written);
return 0;
}
static ssize_t
show_ata_dev_ering(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ata_device *ata_dev = transport_class_to_dev(dev);
struct ata_show_ering_arg arg = { buf, 0 };
ata_ering_map(&ata_dev->ering, ata_show_ering, &arg);
return arg.written;
}
static DEVICE_ATTR(ering, S_IRUGO, show_ata_dev_ering, NULL);
static ssize_t
show_ata_dev_id(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ata_device *ata_dev = transport_class_to_dev(dev);
int written = 0, i = 0;
if (ata_dev->class == ATA_DEV_PMP)
return 0;
for(i=0;i<ATA_ID_WORDS;i++) {
written += snprintf(buf+written, 20, "%04x%c",
ata_dev->id[i],
((i+1) & 7) ? ' ' : '\n');
}
return written;
}
static DEVICE_ATTR(id, S_IRUGO, show_ata_dev_id, NULL);
static ssize_t
show_ata_dev_gscr(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ata_device *ata_dev = transport_class_to_dev(dev);
int written = 0, i = 0;
if (ata_dev->class != ATA_DEV_PMP)
return 0;
for(i=0;i<SATA_PMP_GSCR_DWORDS;i++) {
written += snprintf(buf+written, 20, "%08x%c",
ata_dev->gscr[i],
((i+1) & 3) ? ' ' : '\n');
}
if (SATA_PMP_GSCR_DWORDS & 3)
buf[written-1] = '\n';
return written;
}
static DEVICE_ATTR(gscr, S_IRUGO, show_ata_dev_gscr, NULL);
static DECLARE_TRANSPORT_CLASS(ata_dev_class,
"ata_device", NULL, NULL, NULL);
static void ata_tdev_release(struct device *dev)
{
put_device(dev->parent);
}
/**
* ata_is_ata_dev -- check if a struct device represents a ATA device
* @dev: device to check
*
* Returns:
* %1 if the device represents a ATA device, %0 else
*/
int ata_is_ata_dev(const struct device *dev)
{
return dev->release == ata_tdev_release;
}
static int ata_tdev_match(struct attribute_container *cont,
struct device *dev)
{
struct ata_internal* i = to_ata_internal(ata_scsi_transport_template);
if (!ata_is_ata_dev(dev))
return 0;
return &i->dev_attr_cont.ac == cont;
}
/**
* ata_tdev_free -- free a ATA LINK
* @dev: ATA PHY to free
*
* Frees the specified ATA PHY.
*
* Note:
* This function must only be called on a PHY that has not
* successfully been added using ata_tdev_add().
*/
static void ata_tdev_free(struct ata_device *dev)
{
transport_destroy_device(&dev->tdev);
put_device(&dev->tdev);
}
/**
* ata_tdev_delete -- remove ATA device
* @port: ATA PORT to remove
*
* Removes the specified ATA device.
*/
static void ata_tdev_delete(struct ata_device *ata_dev)
{
struct device *dev = &ata_dev->tdev;
transport_remove_device(dev);
device_del(dev);
ata_tdev_free(ata_dev);
}
/**
* ata_tdev_add -- initialize a transport ATA device structure.
* @ata_dev: ata_dev structure.
*
* Initialize an ATA device structure for sysfs. It will be added in the
* device tree below the ATA LINK device it belongs to.
*
* Returns %0 on success
*/
static int ata_tdev_add(struct ata_device *ata_dev)
{
struct device *dev = &ata_dev->tdev;
struct ata_link *link = ata_dev->link;
struct ata_port *ap = link->ap;
int error;
device_initialize(dev);
dev->parent = get_device(&link->tdev);
dev->release = ata_tdev_release;
if (ata_is_host_link(link))
dev_set_name(dev, "dev%d.%d", ap->print_id,ata_dev->devno);
else
dev_set_name(dev, "dev%d.%d.0", ap->print_id, link->pmp);
transport_setup_device(dev);
error = device_add(dev);
if (error) {
ata_tdev_free(ata_dev);
return error;
}
transport_add_device(dev);
transport_configure_device(dev);
return 0;
}
/*
* Setup / Teardown code
*/
#define SETUP_TEMPLATE(attrb, field, perm, test) \
i->private_##attrb[count] = dev_attr_##field; \
i->private_##attrb[count].attr.mode = perm; \
i->attrb[count] = &i->private_##attrb[count]; \
if (test) \
count++
#define SETUP_LINK_ATTRIBUTE(field) \
SETUP_TEMPLATE(link_attrs, field, S_IRUGO, 1)
#define SETUP_PORT_ATTRIBUTE(field) \
SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
#define SETUP_DEV_ATTRIBUTE(field) \
SETUP_TEMPLATE(dev_attrs, field, S_IRUGO, 1)
/**
* ata_attach_transport -- instantiate ATA transport template
*/
struct scsi_transport_template *ata_attach_transport(void)
{
struct ata_internal *i;
int count;
i = kzalloc(sizeof(struct ata_internal), GFP_KERNEL);
if (!i)
return NULL;
i->t.eh_strategy_handler = ata_scsi_error;
i->t.eh_timed_out = ata_scsi_timed_out;
i->t.user_scan = ata_scsi_user_scan;
i->t.host_attrs.ac.attrs = &i->port_attrs[0];
i->t.host_attrs.ac.class = &ata_port_class.class;
i->t.host_attrs.ac.match = ata_tport_match;
transport_container_register(&i->t.host_attrs);
i->link_attr_cont.ac.class = &ata_link_class.class;
i->link_attr_cont.ac.attrs = &i->link_attrs[0];
i->link_attr_cont.ac.match = ata_tlink_match;
transport_container_register(&i->link_attr_cont);
i->dev_attr_cont.ac.class = &ata_dev_class.class;
i->dev_attr_cont.ac.attrs = &i->dev_attrs[0];
i->dev_attr_cont.ac.match = ata_tdev_match;
transport_container_register(&i->dev_attr_cont);
count = 0;
SETUP_PORT_ATTRIBUTE(nr_pmp_links);
SETUP_PORT_ATTRIBUTE(idle_irq);
BUG_ON(count > ATA_PORT_ATTRS);
i->port_attrs[count] = NULL;
count = 0;
SETUP_LINK_ATTRIBUTE(hw_sata_spd_limit);
SETUP_LINK_ATTRIBUTE(sata_spd_limit);
SETUP_LINK_ATTRIBUTE(sata_spd);
BUG_ON(count > ATA_LINK_ATTRS);
i->link_attrs[count] = NULL;
count = 0;
SETUP_DEV_ATTRIBUTE(class);
SETUP_DEV_ATTRIBUTE(pio_mode);
SETUP_DEV_ATTRIBUTE(dma_mode);
SETUP_DEV_ATTRIBUTE(xfer_mode);
SETUP_DEV_ATTRIBUTE(spdn_cnt);
SETUP_DEV_ATTRIBUTE(ering);
SETUP_DEV_ATTRIBUTE(id);
SETUP_DEV_ATTRIBUTE(gscr);
BUG_ON(count > ATA_DEV_ATTRS);
i->dev_attrs[count] = NULL;
return &i->t;
}
/**
* ata_release_transport -- release ATA transport template instance
* @t: transport template instance
*/
void ata_release_transport(struct scsi_transport_template *t)
{
struct ata_internal *i = to_ata_internal(t);
transport_container_unregister(&i->t.host_attrs);
transport_container_unregister(&i->link_attr_cont);
transport_container_unregister(&i->dev_attr_cont);
kfree(i);
}
__init int libata_transport_init(void)
{
int error;
error = transport_class_register(&ata_link_class);
if (error)
goto out_unregister_transport;
error = transport_class_register(&ata_port_class);
if (error)
goto out_unregister_link;
error = transport_class_register(&ata_dev_class);
if (error)
goto out_unregister_port;
return 0;
out_unregister_port:
transport_class_unregister(&ata_port_class);
out_unregister_link:
transport_class_unregister(&ata_link_class);
out_unregister_transport:
return error;
}
void __exit libata_transport_exit(void)
{
transport_class_unregister(&ata_link_class);
transport_class_unregister(&ata_port_class);
transport_class_unregister(&ata_dev_class);
}