Commit 7d77b247 authored by Tejun Heo's avatar Tejun Heo Committed by Jeff Garzik
Browse files

libata-pmp-prep: implement sata_async_notification()



AN serves multiple purposes.  For ATAPI, it's used for media change
notification.  For PMP, for downstream PHY status change notification.
Implement sata_async_notification() which demultiplexes AN.

To avoid unnecessary port events, ATAPI AN is not enabled if PMP is
attached but SNTF is not available.
Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
Cc: Kriten Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent e31e8531
......@@ -1356,27 +1356,17 @@ static void ahci_port_intr(struct ata_port *ap)
}
if (status & PORT_IRQ_SDB_FIS) {
/*
* if this is an ATAPI device with AN turned on,
* then we should interrogate the device to
* determine the cause of the interrupt
*
* for AN - this we should check the SDB FIS
* and find the I and N bits set
/* If the 'N' bit in word 0 of the FIS is set, we just
* received asynchronous notification. Tell libata
* about it. Note that as the SDB FIS itself is
* accessible, SNotification can be emulated by the
* driver but don't bother for the time being.
*/
const __le32 *f = pp->rx_fis + RX_FIS_SDB;
u32 f0 = le32_to_cpu(f[0]);
/* check the 'N' bit in word 0 of the FIS */
if (f0 & (1 << 15)) {
int port_addr = ((f0 & 0x00000f00) >> 8);
struct ata_device *adev;
if (port_addr < ATA_MAX_DEVICES) {
adev = &ap->link.device[port_addr];
if (adev->flags & ATA_DFLAG_AN)
ata_scsi_media_change_notify(adev);
}
}
if (f0 & (1 << 15))
sata_async_notification(ap);
}
if (ap->link.sactive)
......
......@@ -2016,6 +2016,7 @@ int ata_dev_configure(struct ata_device *dev)
else if (dev->class == ATA_DEV_ATAPI) {
const char *cdb_intr_string = "";
const char *atapi_an_string = "";
u32 sntf;
rc = atapi_cdb_len(id);
if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
......@@ -2027,11 +2028,14 @@ int ata_dev_configure(struct ata_device *dev)
}
dev->cdb_len = (unsigned int) rc;
/*
* check to see if this ATAPI device supports
* Asynchronous Notification
/* Enable ATAPI AN if both the host and device have
* the support. If PMP is attached, SNTF is required
* to enable ATAPI AN to discern between PHY status
* changed notifications and ATAPI ANs.
*/
if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id)) {
if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
(!ap->nr_pmp_links ||
sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
unsigned int err_mask;
/* issue SET feature command to turn this on */
......@@ -7248,6 +7252,7 @@ EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_link_abort);
EXPORT_SYMBOL_GPL(ata_port_abort);
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(sata_async_notification);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
......
......@@ -904,6 +904,79 @@ int ata_port_freeze(struct ata_port *ap)
return nr_aborted;
}
/**
* sata_async_notification - SATA async notification handler
* @ap: ATA port where async notification is received
*
* Handler to be called when async notification via SDB FIS is
* received. This function schedules EH if necessary.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*
* RETURNS:
* 1 if EH is scheduled, 0 otherwise.
*/
int sata_async_notification(struct ata_port *ap)
{
u32 sntf;
int rc;
if (!(ap->flags & ATA_FLAG_AN))
return 0;
rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
if (rc == 0)
sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
if (!ap->nr_pmp_links || rc) {
/* PMP is not attached or SNTF is not available */
if (!ap->nr_pmp_links) {
/* PMP is not attached. Check whether ATAPI
* AN is configured. If so, notify media
* change.
*/
struct ata_device *dev = ap->link.device;
if ((dev->class == ATA_DEV_ATAPI) &&
(dev->flags & ATA_DFLAG_AN))
ata_scsi_media_change_notify(dev);
return 0;
} else {
/* PMP is attached but SNTF is not available.
* ATAPI async media change notification is
* not used. The PMP must be reporting PHY
* status change, schedule EH.
*/
ata_port_schedule_eh(ap);
return 1;
}
} else {
/* PMP is attached and SNTF is available */
struct ata_link *link;
/* check and notify ATAPI AN */
ata_port_for_each_link(link, ap) {
if (!(sntf & (1 << link->pmp)))
continue;
if ((link->device->class == ATA_DEV_ATAPI) &&
(link->device->flags & ATA_DFLAG_AN))
ata_scsi_media_change_notify(link->device);
}
/* If PMP is reporting that PHY status of some
* downstream ports has changed, schedule EH.
*/
if (sntf & (1 << SATA_PMP_CTRL_PORT)) {
ata_port_schedule_eh(ap);
return 1;
}
return 0;
}
}
/**
* ata_eh_freeze_port - EH helper to freeze port
* @ap: ATA port to freeze
......
......@@ -3244,7 +3244,6 @@ void ata_scsi_media_change_notify(struct ata_device *dev)
scsi_device_event_notify(dev->sdev, SDEV_MEDIA_CHANGE);
#endif
}
EXPORT_SYMBOL_GPL(ata_scsi_media_change_notify);
/**
* ata_scsi_hotplug - SCSI part of hotplug
......
......@@ -119,6 +119,7 @@ extern int ata_scsi_add_hosts(struct ata_host *host,
struct scsi_host_template *sht);
extern void ata_scsi_scan_host(struct ata_port *ap, int sync);
extern int ata_scsi_offline_dev(struct ata_device *dev);
extern void ata_scsi_media_change_notify(struct ata_device *dev);
extern void ata_scsi_hotplug(struct work_struct *work);
extern unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
unsigned int buflen);
......
......@@ -821,11 +821,8 @@ static void sil24_error_intr(struct ata_port *ap)
ata_ehi_push_desc(ehi, "irq_stat 0x%08x", irq_stat);
if (irq_stat & PORT_IRQ_SDB_NOTIFY) {
struct ata_device *dev = ap->link.device;
ata_ehi_push_desc(ehi, "SDB notify");
if (dev->flags & ATA_DFLAG_AN)
ata_scsi_media_change_notify(dev);
sata_async_notification(ap);
}
if (irq_stat & (PORT_IRQ_PHYRDY_CHG | PORT_IRQ_DEV_XCHG)) {
......
......@@ -139,7 +139,7 @@ enum {
ATA_DFLAG_FLUSH_EXT = (1 << 4), /* do FLUSH_EXT instead of FLUSH */
ATA_DFLAG_ACPI_PENDING = (1 << 5), /* ACPI resume action pending */
ATA_DFLAG_ACPI_FAILED = (1 << 6), /* ACPI on devcfg has failed */
ATA_DFLAG_AN = (1 << 7), /* device supports AN */
ATA_DFLAG_AN = (1 << 7), /* AN configured */
ATA_DFLAG_CFG_MASK = (1 << 12) - 1,
ATA_DFLAG_PIO = (1 << 12), /* device limited to PIO mode */
......@@ -787,7 +787,6 @@ extern void ata_host_init(struct ata_host *, struct device *,
extern int ata_scsi_detect(struct scsi_host_template *sht);
extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
extern void ata_scsi_media_change_notify(struct ata_device *atadev);
extern void ata_sas_port_destroy(struct ata_port *);
extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
struct ata_port_info *, struct Scsi_Host *);
......@@ -953,6 +952,7 @@ extern void ata_port_schedule_eh(struct ata_port *ap);
extern int ata_link_abort(struct ata_link *link);
extern int ata_port_abort(struct ata_port *ap);
extern int ata_port_freeze(struct ata_port *ap);
extern int sata_async_notification(struct ata_port *ap);
extern void ata_eh_freeze_port(struct ata_port *ap);
extern void ata_eh_thaw_port(struct ata_port *ap);
......
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