Hi!
This is my first attempt at ahci autosuspend. It is _very_ hacky at
this moment, I'll seriously need to clean it up. But it seems to work
here.
It includes Alan Stern's patches. I guess I could/should produce
separate version.
Pavel
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 54f38c2..58c558c 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -32,6 +32,7 @@
*
*/
+#define DEBUG
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
@@ -259,8 +260,8 @@ static void ahci_fill_cmd_slot(struct ah
u32 opts);
#ifdef CONFIG_PM
static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
-static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
-static int ahci_pci_device_resume(struct pci_dev *pdev);
+int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
+int ahci_pci_device_resume(struct pci_dev *pdev);
#endif
static struct class_device_attribute *ahci_shost_attrs[] = {
@@ -268,6 +269,37 @@ static struct class_device_attribute *ah
NULL
};
+struct pci_dev *my_pdev;
+int ahci_runtime_suspend(struct pci_dev *pdev);
+int ahci_runtime_resume(struct pci_dev *pdev);
+int autosuspend_enabled;
+
+/* The host and its devices are all idle so we can autosuspend */
+static int autosuspend(struct Scsi_Host *host)
+{
+ if (my_pdev && autosuspend_enabled) {
+ printk("ahci: should autosuspend\n");
+ ahci_runtime_suspend(my_pdev);
+ return 0;
+ }
+ printk("ahci: autosuspend disabled\n");
+ return -EINVAL;
+}
+
+/* The host needs to be autoresumed */
+static int autoresume(struct Scsi_Host *host)
+{
+ if (my_pdev && autosuspend_enabled) {
+ printk("ahci: should autoresume\n");
+ ahci_runtime_resume(my_pdev);
+ return 0;
+ }
+ printk("ahci: autoresume disabled\n");
+ return -EINVAL;
+}
+
+
+
static struct scsi_host_template ahci_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
@@ -286,6 +318,8 @@ static struct scsi_host_template ahci_sh
.slave_destroy = ata_scsi_slave_destroy,
.bios_param = ata_std_bios_param,
.shost_attrs = ahci_shost_attrs,
+ .autosuspend = autosuspend,
+ .autoresume = autoresume,
};
static const struct ata_port_operations ahci_ops = {
@@ -1810,6 +1844,10 @@ static void ahci_thaw(struct ata_port *a
static void ahci_error_handler(struct ata_port *ap)
{
+ struct ata_host *host = ap->host;
+ int rc;
+ extern int slept;
+
if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
/* restart engine */
ahci_stop_engine(ap);
@@ -1916,7 +1954,7 @@ static int ahci_port_suspend(struct ata_
return rc;
}
-static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
+int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
{
struct ata_host *host = dev_get_drvdata(&pdev->dev);
void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
@@ -1936,7 +1974,8 @@ static int ahci_pci_device_suspend(struc
return ata_pci_device_suspend(pdev, mesg);
}
-static int ahci_pci_device_resume(struct pci_dev *pdev)
+
+int ahci_pci_device_resume(struct pci_dev *pdev)
{
struct ata_host *host = dev_get_drvdata(&pdev->dev);
int rc;
@@ -1945,7 +1984,7 @@ static int ahci_pci_device_resume(struct
if (rc)
return rc;
- if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
+ if (1) {
rc = ahci_reset_controller(host);
if (rc)
return rc;
@@ -1957,6 +1996,55 @@ static int ahci_pci_device_resume(struct
return 0;
}
+
+int ahci_runtime_suspend(struct pci_dev *pdev)
+{
+ struct ata_host *host = dev_get_drvdata(&pdev->dev);
+ int i;
+
+ printk("ahci_runtime_suspend...\n");
+
+#if 0
+ for (i = 0; i < host->n_ports; i++) {
+ struct ata_port *ap = host->ports[i];
+
+ if (ata_port_is_dummy(ap))
+ continue;
+
+ printk("suspending ata port %d...\n", i);
+ ahci_port_suspend(ap, PMSG_SUSPEND);
+ printk("done suspending port %d...\n", i);
+ }
+#endif
+
+ ata_pci_device_suspend(my_pdev, PMSG_SUSPEND);
+}
+
+int ahci_runtime_resume(struct pci_dev *pdev)
+{
+ struct ata_host *host = dev_get_drvdata(&pdev->dev);
+ int i;
+
+ printk("ahci_runtime_resume\n");
+ ata_pci_device_resume(my_pdev);
+
+#if 0
+
+ for (i = 0; i < host->n_ports; i++) {
+ struct ata_port *ap = host->ports[i];
+
+ if (ata_port_is_dummy(ap))
+ continue;
+
+ printk("resume ata port %d...\n", i);
+ ahci_port_resume(ap);
+ printk("done resume ata port %d...\n", i);
+ }
+#endif
+
+}
+
+
#endif
static int ahci_port_start(struct ata_port *ap)
@@ -2179,6 +2267,7 @@ static void ahci_p5wdh_workaround(struct
}
}
+
static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
static int printed_version;
@@ -2283,8 +2372,12 @@ static int ahci_init_one(struct pci_dev
ahci_print_info(host);
pci_set_master(pdev);
- return ata_host_activate(host, pdev->irq, ahci_interrupt, IRQF_SHARED,
+
+ rc = ata_host_activate(host, pdev->irq, ahci_interrupt, IRQF_SHARED,
&ahci_sht);
+ pci_save_state(pdev);
+ my_pdev = pdev;
+ return rc;
}
static int __init ahci_init(void)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 4753a18..b660611 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -779,6 +779,7 @@ void ata_lpm_schedule(struct ata_port *a
}
#ifdef CONFIG_PM
+/* This disables link power management */
static void ata_lpm_enable(struct ata_host *host)
{
struct ata_link *link;
@@ -795,6 +796,7 @@ static void ata_lpm_enable(struct ata_ho
}
}
+/* This enables link power management */
static void ata_lpm_disable(struct ata_host *host)
{
int i;
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index f0124a8..b725df6 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -32,6 +32,7 @@
*
*/
+#define DEBUG
#include <linux/kernel.h>
#include <linux/pci.h>
#include <scsi/scsi.h>
@@ -353,7 +354,7 @@ enum scsi_eh_timer_return ata_scsi_timed
* Inherited from SCSI layer (none, can sleep)
*
* RETURNS:
- * Zero.
+ * Nothing.
*/
void ata_scsi_error(struct Scsi_Host *host)
{
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index a883bb0..e2cca05 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -33,6 +33,7 @@
*
*/
+#define DEBUG
#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 691ffb6..e6dd899 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -183,7 +183,7 @@ static void dpm_power_up(void)
*
* Power on system devices then devices that required we shut them down
* with interrupts disabled.
- * Called with interrupts disabled.
+ * Called with interrupts disabled, may not sleep.
*/
void device_power_up(void)
@@ -353,6 +353,8 @@ EXPORT_SYMBOL_GPL(device_suspend);
* Walk the dpm_off_irq list, calling ->power_down() for each device that
* couldn't power down the device with interrupts enabled. When we're
* done, power down system devices.
+ *
+ * Must be called with disabled interrupts, may not sleep.
*/
int device_power_down(pm_message_t state)
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 5ffbb88..1f61299 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -765,6 +765,7 @@ static int __init init_netconsole(void)
if (err)
goto undonotifier;
+ disable_console_on_suspend++;
register_console(&netconsole);
printk(KERN_INFO "netconsole: network logging started\n");
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index a6676be..835e93d 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -43,8 +43,8 @@ config SCSI_TGT
config SCSI_NETLINK
bool
+ depends on NET
default n
- select NET
config SCSI_PROC_FS
bool "legacy /proc/scsi/ support"
@@ -57,6 +57,18 @@ config SCSI_PROC_FS
If unsure say Y.
+config SCSI_DYNAMIC_PM
+ bool "SCSI dynamic Power Management support (EXPERIMENTAL)"
+ depends on SCSI && PM && EXPERIMENTAL
+ ---help---
+ This option enables support for dynamic (or runtime)
+ power management of SCSI devices and host adapters.
+ If you say Y here, you can use the sysfs "power/level"
+ and "power/autosuspend" files to control manual or
+ automatic suspend/resume of individual SCSI devices.
+
+ If unsure say N.
+
comment "SCSI support type (disk, tape, CD-ROM)"
depends on SCSI
@@ -265,8 +277,7 @@ config SCSI_SPI_ATTRS
config SCSI_FC_ATTRS
tristate "FiberChannel Transport Attributes"
- depends on SCSI
- select SCSI_NETLINK
+ depends on SCSI && SCSI_NETLINK
help
If you wish to export transport-specific information about
each attached FiberChannel device to sysfs, say Y.
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 2e6129f..1f413cc 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -150,7 +150,8 @@ obj-$(CONFIG_SCSI_WAIT_SCAN) += scsi_wai
scsi_mod-y += scsi.o hosts.o scsi_ioctl.o constants.o \
scsicam.o scsi_error.o scsi_lib.o
scsi_mod-$(CONFIG_SCSI_DMA) += scsi_lib_dma.o
-scsi_mod-y += scsi_scan.o scsi_sysfs.o scsi_devinfo.o
+scsi_mod-y += scsi_scan.o scsi_sysfs.o scsi_devinfo.o \
+ scsi_pm.o
scsi_mod-$(CONFIG_SCSI_NETLINK) += scsi_netlink.o
scsi_mod-$(CONFIG_SYSCTL) += scsi_sysctl.o
scsi_mod-$(CONFIG_SCSI_PROC_FS) += scsi_proc.o
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 24271a8..96c1839 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -155,24 +155,15 @@ EXPORT_SYMBOL(scsi_host_set_state);
**/
void scsi_remove_host(struct Scsi_Host *shost)
{
- unsigned long flags;
- mutex_lock(&shost->scan_mutex);
- spin_lock_irqsave(shost->host_lock, flags);
- if (scsi_host_set_state(shost, SHOST_CANCEL))
- if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) {
- spin_unlock_irqrestore(shost->host_lock, flags);
- mutex_unlock(&shost->scan_mutex);
- return;
- }
- spin_unlock_irqrestore(shost->host_lock, flags);
- mutex_unlock(&shost->scan_mutex);
+ if (scsi_pm_host_stop(shost))
+ return;
scsi_forget_host(shost);
scsi_proc_host_rm(shost);
- spin_lock_irqsave(shost->host_lock, flags);
+ spin_lock_irq(shost->host_lock);
if (scsi_host_set_state(shost, SHOST_DEL))
BUG_ON(scsi_host_set_state(shost, SHOST_DEL_RECOVERY));
- spin_unlock_irqrestore(shost->host_lock, flags);
+ spin_unlock_irq(shost->host_lock);
transport_unregister_device(&shost->shost_gendev);
class_device_unregister(&shost->shost_classdev);
@@ -237,6 +228,7 @@ int scsi_add_host(struct Scsi_Host *shos
if (error)
goto out_destroy_host;
+ scsi_autosuspend_host(shost);
scsi_proc_host_add(shost);
return error;
@@ -388,6 +380,8 @@ struct Scsi_Host *scsi_host_alloc(struct
snprintf(shost->shost_classdev.class_id, BUS_ID_SIZE, "host%d",
shost->host_no);
+ scsi_pm_host_initialize(shost);
+
shost->ehandler = kthread_run(scsi_error_handler, shost,
"scsi_eh_%d", shost->host_no);
if (IS_ERR(shost->ehandler)) {
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 0fb1709..948a789 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -1078,15 +1078,20 @@ static int __init init_scsi(void)
error = scsi_init_sysctl();
if (error)
goto cleanup_hosts;
- error = scsi_sysfs_register();
+ error = scsi_init_pm();
if (error)
goto cleanup_sysctl;
+ error = scsi_sysfs_register();
+ if (error)
+ goto cleanup_pm;
scsi_netlink_init();
printk(KERN_NOTICE "SCSI subsystem initialized\n");
return 0;
+cleanup_pm:
+ scsi_exit_pm();
cleanup_sysctl:
scsi_exit_sysctl();
cleanup_hosts:
@@ -1106,6 +1111,7 @@ static void __exit exit_scsi(void)
{
scsi_netlink_exit();
scsi_sysfs_unregister();
+ scsi_exit_pm();
scsi_exit_sysctl();
scsi_exit_hosts();
scsi_exit_devinfo();
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index ebaca4c..222d7ca 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -468,30 +468,34 @@ static void scsi_eh_done(struct scsi_cmn
/**
* scsi_try_host_reset - ask host adapter to reset itself
- * @scmd: SCSI cmd to send hsot reset.
+ * @scmd: SCSI cmd to send host reset.
**/
static int scsi_try_host_reset(struct scsi_cmnd *scmd)
{
unsigned long flags;
int rtn;
+ struct Scsi_Host *shost = scmd->device->host;
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n",
__FUNCTION__));
if (!scmd->device->host->hostt->eh_host_reset_handler)
return FAILED;
+ if (scsi_autoresume_host(shost) != 0)
+ return FAILED;
- rtn = scmd->device->host->hostt->eh_host_reset_handler(scmd);
+ rtn = shost->hostt->eh_host_reset_handler(scmd);
if (rtn == SUCCESS) {
- if (!scmd->device->host->hostt->skip_settle_delay)
+ if (!shost->hostt->skip_settle_delay)
ssleep(HOST_RESET_SETTLE_TIME);
- spin_lock_irqsave(scmd->device->host->host_lock, flags);
- scsi_report_bus_reset(scmd->device->host,
+ spin_lock_irqsave(shost->host_lock, flags);
+ scsi_report_bus_reset(shost,
scmd_channel(scmd));
- spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+ spin_unlock_irqrestore(shost->host_lock, flags);
}
+ scsi_autosuspend_host(shost);
return rtn;
}
@@ -503,24 +507,28 @@ static int scsi_try_bus_reset(struct scs
{
unsigned long flags;
int rtn;
+ struct Scsi_Host *shost = scmd->device->host;
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n",
__FUNCTION__));
- if (!scmd->device->host->hostt->eh_bus_reset_handler)
+ if (!shost->hostt->eh_bus_reset_handler)
+ return FAILED;
+ if (scsi_autoresume_host(shost) != 0)
return FAILED;
- rtn = scmd->device->host->hostt->eh_bus_reset_handler(scmd);
+ rtn = shost->hostt->eh_bus_reset_handler(scmd);
if (rtn == SUCCESS) {
- if (!scmd->device->host->hostt->skip_settle_delay)
+ if (!shost->hostt->skip_settle_delay)
ssleep(BUS_RESET_SETTLE_TIME);
- spin_lock_irqsave(scmd->device->host->host_lock, flags);
- scsi_report_bus_reset(scmd->device->host,
+ spin_lock_irqsave(shost->host_lock, flags);
+ scsi_report_bus_reset(shost,
scmd_channel(scmd));
- spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+ spin_unlock_irqrestore(shost->host_lock, flags);
}
+ scsi_autosuspend_host(shost);
return rtn;
}
@@ -1544,6 +1552,7 @@ static void scsi_unjam_host(struct Scsi_
int scsi_error_handler(void *data)
{
struct Scsi_Host *shost = data;
+ int autoresume_rc;
/*
* We use TASK_INTERRUPTIBLE so that the thread is not
@@ -1573,6 +1582,11 @@ int scsi_error_handler(void *data)
* what we need to do to get it up and online again (if we can).
* If we fail, we end up taking the thing offline.
*/
+#if 0
+ /* libata uses scsi_error_handler to suspend its parts; we deadlock
+ if we try to autoresume here */
+ autoresume_rc = scsi_autoresume_host(shost);
+#endif
if (shost->transportt->eh_strategy_handler)
shost->transportt->eh_strategy_handler(shost);
else
@@ -1586,6 +1600,10 @@ int scsi_error_handler(void *data)
* which are still online.
*/
scsi_restart_operations(shost);
+#if 0
+ if (autoresume_rc == 0)
+ scsi_autosuspend_host(shost);
+#endif
set_current_state(TASK_INTERRUPTIBLE);
}
__set_current_state(TASK_RUNNING);
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index a9ac5b1..11667b9 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -64,8 +64,6 @@ #endif
};
#undef SP
-static void scsi_run_queue(struct request_queue *q);
-
/*
* Function: scsi_unprep_request()
*
@@ -457,6 +455,7 @@ void scsi_device_unbusy(struct scsi_devi
spin_unlock(shost->host_lock);
spin_lock(sdev->request_queue->queue_lock);
sdev->device_busy--;
+ scsi_mark_last_busy(sdev);
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
}
@@ -518,7 +517,7 @@ static void scsi_single_lun_run(struct s
* Notes: The previous command was completely finished, start
* a new one if possible.
*/
-static void scsi_run_queue(struct request_queue *q)
+void scsi_run_queue(struct request_queue *q)
{
struct scsi_device *sdev = q->queuedata;
struct Scsi_Host *shost = sdev->host;
@@ -1278,6 +1277,8 @@ int scsi_prep_state_check(struct scsi_de
ret = BLKPREP_KILL;
break;
case SDEV_QUIESCE:
+ ret = scsi_pm_state_check(sdev, req);
+ break;
case SDEV_BLOCK:
/*
* If the devices is blocked we defer normal commands.
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index 3f34e93..c331de4 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -4,11 +4,13 @@ #define _SCSI_PRIV_H
#include <linux/device.h>
struct request_queue;
+struct request;
struct scsi_cmnd;
struct scsi_device;
struct scsi_host_template;
struct Scsi_Host;
struct scsi_nl_hdr;
+struct workqueue_struct;
/*
@@ -67,6 +69,7 @@ int scsi_eh_get_sense(struct list_head *
extern int scsi_maybe_unblock_host(struct scsi_device *sdev);
extern void scsi_device_unbusy(struct scsi_device *sdev);
extern int scsi_queue_insert(struct scsi_cmnd *cmd, int reason);
+extern void scsi_run_queue(struct request_queue *q);
extern void scsi_next_command(struct scsi_cmnd *cmd);
extern void scsi_io_completion(struct scsi_cmnd *, unsigned int);
extern void scsi_run_host_queues(struct Scsi_Host *shost);
@@ -132,6 +135,41 @@ static inline void scsi_netlink_init(voi
static inline void scsi_netlink_exit(void) {}
#endif
+/* scsi_pm.c */
+extern int scsi_bus_suspend(struct device *, pm_message_t);
+extern int scsi_bus_resume(struct device *);
+extern int scsi_pm_state_check(struct scsi_device *, struct request *);
+extern int scsi_pm_device_stop(struct scsi_device *);
+extern int scsi_pm_host_stop(struct Scsi_Host *);
+#ifdef CONFIG_SCSI_DYNAMIC_PM
+extern void scsi_autosuspend_host(struct Scsi_Host *);
+extern int scsi_autoresume_host(struct Scsi_Host *);
+extern void scsi_pm_host_initialize(struct Scsi_Host *);
+extern void scsi_mark_last_busy(struct scsi_device *);
+extern void scsi_use_ULD_pm(struct scsi_device *, int);
+extern void scsi_autosuspend_device(struct scsi_device *);
+extern int scsi_autoresume_device(struct scsi_device *);
+extern int scsi_pm_create_device_files(struct scsi_device *);
+extern void scsi_pm_device_initialize(struct scsi_device *);
+extern int scsi_init_pm(void);
+extern void scsi_exit_pm(void);
+#else
+static inline void scsi_autosuspend_host(struct Scsi_Host *shost) {}
+static inline int scsi_autoresume_host(struct Scsi_Host *shost)
+ { return 0; }
+static inline void scsi_pm_host_initialize(struct Scsi_Host *shost) {}
+static inline void scsi_mark_last_busy(struct scsi_device *sdev) {}
+static inline void scsi_use_ULD_pm(struct scsi_device *sdev, int v) {}
+static inline void scsi_autosuspend_device(struct scsi_device *sdev) {}
+static inline int scsi_autoresume_device(struct scsi_device *sdev)
+ { return 0; }
+static inline int scsi_pm_create_device_files(struct scsi_device *sdev)
+ { return 0; }
+static inline void scsi_pm_device_initialize(struct scsi_device *sdev) {}
+static inline int scsi_init_pm(void) { return 0; }
+static inline void scsi_exit_pm(void) {}
+#endif /* CONFIG_SCSI_DYNAMIC_PM */
+
/*
* internal scsi timeout functions: for use by mid-layer and transport
* classes.
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 40ea71c..de8c8ca 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -294,6 +294,9 @@ static struct scsi_device *scsi_alloc_sd
scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
scsi_sysfs_device_initialize(sdev);
+ scsi_pm_device_initialize(sdev);
+ if (scsi_autoresume_host(shost) != 0)
+ goto out_device_destroy;
if (shost->hostt->slave_alloc) {
ret = shost->hostt->slave_alloc(sdev);
@@ -304,6 +307,7 @@ static struct scsi_device *scsi_alloc_sd
*/
if (ret == -ENXIO)
display_failure_msg = 0;
+ scsi_autosuspend_host(shost);
goto out_device_destroy;
}
}
@@ -920,6 +924,7 @@ static int scsi_add_lun(struct scsi_devi
static inline void scsi_destroy_sdev(struct scsi_device *sdev)
{
scsi_device_set_state(sdev, SDEV_DEL);
+ scsi_autosuspend_host(sdev->host);
if (sdev->host->hostt->slave_destroy)
sdev->host->hostt->slave_destroy(sdev);
transport_destroy_device(&sdev->sdev_gendev);
@@ -1082,6 +1087,7 @@ static int scsi_probe_and_add_lun(struct
res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
if (res == SCSI_SCAN_LUN_PRESENT) {
+ scsi_autosuspend_device(sdev);
if (bflags & BLIST_KEY) {
sdev->lockable = 0;
scsi_unlock_floptical(sdev, result);
@@ -1775,6 +1781,8 @@ static void scsi_finish_async_scan(struc
static void do_scsi_scan_host(struct Scsi_Host *shost)
{
+ if (scsi_autoresume_host(shost) != 0)
+ return;
if (shost->hostt->scan_finished) {
unsigned long start = jiffies;
if (shost->hostt->scan_start)
@@ -1786,6 +1794,7 @@ static void do_scsi_scan_host(struct Scs
scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
SCAN_WILD_CARD, 0);
}
+ scsi_autosuspend_host(shost);
}
static int do_scan_async(void *_data)
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 00b3866..4228cb4 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -340,39 +340,6 @@ static int scsi_bus_uevent(struct device
return 0;
}
-static int scsi_bus_suspend(struct device * dev, pm_message_t state)
-{
- struct device_driver *drv = dev->driver;
- struct scsi_device *sdev = to_scsi_device(dev);
- int err;
-
- err = scsi_device_quiesce(sdev);
- if (err)
- return err;
-
- if (drv && drv->suspend) {
- err = drv->suspend(dev, state);
- if (err)
- return err;
- }
-
- return 0;
-}
-
-static int scsi_bus_resume(struct device * dev)
-{
- struct device_driver *drv = dev->driver;
- struct scsi_device *sdev = to_scsi_device(dev);
- int err = 0;
-
- if (drv && drv->resume)
- err = drv->resume(dev);
-
- scsi_device_resume(sdev);
-
- return err;
-}
-
static int scsi_bus_remove(struct device *dev)
{
struct device_driver *drv = dev->driver;
@@ -814,6 +781,12 @@ int scsi_sysfs_add_sdev(struct scsi_devi
goto out;
}
+ error = scsi_pm_create_device_files(sdev);
+ if (error) {
+ __scsi_remove_device(sdev);
+ goto out;
+ }
+
error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL);
if (error)
@@ -854,7 +827,7 @@ void __scsi_remove_device(struct scsi_de
{
struct device *dev = &sdev->sdev_gendev;
- if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
+ if (scsi_pm_device_stop(sdev) != 0)
return;
bsg_unregister_queue(sdev->request_queue);
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index a69b155..1bf4150 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -61,6 +61,7 @@ #include <scsi/scsicam.h>
#include <scsi/sd.h>
#include "scsi_logging.h"
+#include "scsi_priv.h"
MODULE_AUTHOR("Eric Youngdale");
MODULE_DESCRIPTION("SCSI disk (sd) driver");
@@ -1629,6 +1630,10 @@ static int sd_probe(struct device *dev)
if (error)
goto out_put;
+ error = scsi_autoresume_device(sdp);
+ if (error)
+ goto out_put;
+
sdkp->device = sdp;
sdkp->driver = &sd_template;
sdkp->disk = gd;
@@ -1648,7 +1653,7 @@ static int sd_probe(struct device *dev)
strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
if (class_device_add(&sdkp->cdev))
- goto out_put;
+ goto out_suspend;
get_device(&sdp->sdev_gendev);
@@ -1688,8 +1693,12 @@ static int sd_probe(struct device *dev)
sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
sdp->removable ? "removable " : "");
+ scsi_use_ULD_pm(sdp, 1);
+ scsi_autosuspend_device(sdp);
return 0;
+ out_suspend:
+ scsi_autosuspend_device(sdp);
out_put:
put_disk(gd);
out_free:
@@ -1715,6 +1724,7 @@ static int sd_remove(struct device *dev)
class_device_del(&sdkp->cdev);
del_gendisk(sdkp->disk);
+ scsi_use_ULD_pm(sdkp->device, 0);
sd_shutdown(dev);
mutex_lock(&sd_ref_mutex);
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index f1871ea..8bc3477 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -56,6 +56,7 @@ #include <scsi/scsi_driver.h>
#include <scsi/scsi_ioctl.h>
#include <scsi/sg.h>
+#include "scsi_priv.h"
#include "scsi_logging.h"
#ifdef CONFIG_SCSI_PROC_FS
@@ -225,6 +226,7 @@ sg_open(struct inode *inode, struct file
Sg_fd *sfp;
int res;
int retval;
+ int autoresume_rc = 1;
nonseekable_open(inode, filp);
SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
@@ -240,6 +242,10 @@ sg_open(struct inode *inode, struct file
if (retval)
return retval;
+ retval = autoresume_rc = scsi_autoresume_device(sdp->device);
+ if (retval)
+ goto error_out;
+
if (!((flags & O_NONBLOCK) ||
scsi_block_when_processing_errors(sdp->device))) {
retval = -ENXIO;
@@ -297,6 +303,8 @@ sg_open(struct inode *inode, struct file
return 0;
error_out:
+ if (autoresume_rc == 0)
+ scsi_autosuspend_device(sdp->device);
scsi_device_put(sdp->device);
return retval;
}
@@ -312,6 +320,8 @@ sg_release(struct inode *inode, struct f
return -ENXIO;
SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
sg_fasync(-1, filp, 0); /* remove filp from async notification list */
+ scsi_autosuspend_device(sdp->device);
+
if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
if (!sdp->detached) {
scsi_device_put(sdp->device);
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 7c9593b..740b6de 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -295,10 +295,15 @@ static int device_reset(struct scsi_cmnd
US_DEBUGP("%s called\n", __FUNCTION__);
- /* lock the device pointers and do the reset */
- mutex_lock(&(us->dev_mutex));
- result = us->transport_reset(us);
- mutex_unlock(&us->dev_mutex);
+ result = usb_autopm_get_interface(us->pusb_intf);
+ if (result == 0) {
+
+ /* lock the device pointers and do the reset */
+ mutex_lock(&(us->dev_mutex));
+ result = us->transport_reset(us);
+ mutex_unlock(&us->dev_mutex);
+ usb_autopm_put_interface(us->pusb_intf);
+ }
return result < 0 ? FAILED : SUCCESS;
}
@@ -341,6 +346,24 @@ void usb_stor_report_bus_reset(struct us
scsi_unlock(host);
}
+/* The host and its devices are all idle so we can autosuspend */
+static int autosuspend(struct Scsi_Host *host)
+{
+ struct us_data *us = host_to_us(host);
+
+ usb_autopm_put_interface(us->pusb_intf);
+ return 0;
+}
+
+/* The host needs to be autoresumed */
+static int autoresume(struct Scsi_Host *host)
+{
+ struct us_data *us = host_to_us(host);
+
+ return usb_autopm_get_interface(us->pusb_intf);
+}
+
+
/***********************************************************************
* /proc/scsi/ functions
***********************************************************************/
@@ -467,6 +490,10 @@ struct scsi_host_template usb_stor_host_
.eh_device_reset_handler = device_reset,
.eh_bus_reset_handler = bus_reset,
+ /* dynamic power management */
+ .autosuspend = autosuspend,
+ .autoresume = autoresume,
+
/* queue commands only, only one command per LUN */
.can_queue = 1,
.cmd_per_lun = 1,
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index ac6114e..a574646 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -184,16 +184,14 @@ static int storage_suspend(struct usb_in
{
struct us_data *us = usb_get_intfdata(iface);
+ US_DEBUGP("%s\n", __FUNCTION__);
+
/* Wait until no command is running */
mutex_lock(&us->dev_mutex);
- US_DEBUGP("%s\n", __FUNCTION__);
if (us->suspend_resume_hook)
(us->suspend_resume_hook)(us, US_SUSPEND);
- /* When runtime PM is working, we'll set a flag to indicate
- * whether we should autoresume when a SCSI request arrives. */
-
mutex_unlock(&us->dev_mutex);
return 0;
}
@@ -202,13 +200,10 @@ static int storage_resume(struct usb_int
{
struct us_data *us = usb_get_intfdata(iface);
- mutex_lock(&us->dev_mutex);
-
US_DEBUGP("%s\n", __FUNCTION__);
if (us->suspend_resume_hook)
(us->suspend_resume_hook)(us, US_RESUME);
- mutex_unlock(&us->dev_mutex);
return 0;
}
@@ -928,6 +923,7 @@ static int usb_stor_scan_thread(void * _
/* Should we unbind if no devices were detected? */
}
+ usb_autopm_put_interface(us->pusb_intf);
complete_and_exit(&us->scanning_done, 0);
}
@@ -957,6 +953,9 @@ static int storage_probe(struct usb_inte
return -ENOMEM;
}
+ /* Don't autosuspend until the SCSI core tells us */
+ usb_autopm_get_interface(intf);
+
/*
* Allow 16-byte CDBs and thus > 2TB
*/
@@ -1017,6 +1016,7 @@ static int storage_probe(struct usb_inte
goto BadDevice;
}
+ usb_autopm_get_interface(intf); /* dropped in the scanning thread */
wake_up_process(th);
return 0;
@@ -1054,6 +1054,7 @@ #endif
.pre_reset = storage_pre_reset,
.post_reset = storage_post_reset,
.id_table = storage_usb_ids,
+ .supports_autosuspend = 1,
};
static int __init usb_stor_init(void)
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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