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Subject[PATCH v4 07/29] scsi: aic79xx: use generic power management
Date
Drivers should do only device-specific jobs. But in general, drivers using
legacy PCI PM framework for .suspend()/.resume() have to manage many PCI
PM-related tasks themselves which can be done by PCI Core itself. This
brings extra load on the driver and it directly calls PCI helper functions
to handle them.

Switch to the new generic framework by updating function signatures and
define a "struct dev_pm_ops" variable to bind PM callbacks. Also, remove
unnecessary calls to the PCI Helper functions along with the legacy
.suspend & .resume bindings.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
drivers/scsi/aic7xxx/aic79xx.h | 12 +++----
drivers/scsi/aic7xxx/aic79xx_core.c | 8 ++---
drivers/scsi/aic7xxx/aic79xx_osm_pci.c | 43 +++++++-------------------
drivers/scsi/aic7xxx/aic79xx_pci.c | 6 ++--
4 files changed, 20 insertions(+), 49 deletions(-)

diff --git a/drivers/scsi/aic7xxx/aic79xx.h b/drivers/scsi/aic7xxx/aic79xx.h
index 9a515551641c..dd5dfd4f30a5 100644
--- a/drivers/scsi/aic7xxx/aic79xx.h
+++ b/drivers/scsi/aic7xxx/aic79xx.h
@@ -1330,10 +1330,8 @@ const struct ahd_pci_identity *ahd_find_pci_device(ahd_dev_softc_t);
int ahd_pci_config(struct ahd_softc *,
const struct ahd_pci_identity *);
int ahd_pci_test_register_access(struct ahd_softc *);
-#ifdef CONFIG_PM
-void ahd_pci_suspend(struct ahd_softc *);
-void ahd_pci_resume(struct ahd_softc *);
-#endif
+void __maybe_unused ahd_pci_suspend(struct ahd_softc *);
+void __maybe_unused ahd_pci_resume(struct ahd_softc *);

/************************** SCB and SCB queue management **********************/
void ahd_qinfifo_requeue_tail(struct ahd_softc *ahd,
@@ -1344,10 +1342,8 @@ struct ahd_softc *ahd_alloc(void *platform_arg, char *name);
int ahd_softc_init(struct ahd_softc *);
void ahd_controller_info(struct ahd_softc *ahd, char *buf);
int ahd_init(struct ahd_softc *ahd);
-#ifdef CONFIG_PM
-int ahd_suspend(struct ahd_softc *ahd);
-void ahd_resume(struct ahd_softc *ahd);
-#endif
+int __maybe_unused ahd_suspend(struct ahd_softc *ahd);
+void __maybe_unused ahd_resume(struct ahd_softc *ahd);
int ahd_default_config(struct ahd_softc *ahd);
int ahd_parse_vpddata(struct ahd_softc *ahd,
struct vpd_config *vpd);
diff --git a/drivers/scsi/aic7xxx/aic79xx_core.c b/drivers/scsi/aic7xxx/aic79xx_core.c
index 98b02e7d38bb..78560a85b1e3 100644
--- a/drivers/scsi/aic7xxx/aic79xx_core.c
+++ b/drivers/scsi/aic7xxx/aic79xx_core.c
@@ -7866,11 +7866,9 @@ ahd_pause_and_flushwork(struct ahd_softc *ahd)
ahd->flags &= ~AHD_ALL_INTERRUPTS;
}

-#ifdef CONFIG_PM
-int
+int __maybe_unused
ahd_suspend(struct ahd_softc *ahd)
{
-
ahd_pause_and_flushwork(ahd);

if (LIST_FIRST(&ahd->pending_scbs) != NULL) {
@@ -7881,15 +7879,13 @@ ahd_suspend(struct ahd_softc *ahd)
return (0);
}

-void
+void __maybe_unused
ahd_resume(struct ahd_softc *ahd)
{
-
ahd_reset(ahd, /*reinit*/TRUE);
ahd_intr_enable(ahd, TRUE);
ahd_restart(ahd);
}
-#endif

/************************** Busy Target Table *********************************/
/*
diff --git a/drivers/scsi/aic7xxx/aic79xx_osm_pci.c b/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
index 8b891a05d9e7..07b670b80f1b 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
@@ -74,11 +74,10 @@ static const struct pci_device_id ahd_linux_pci_id_table[] = {

MODULE_DEVICE_TABLE(pci, ahd_linux_pci_id_table);

-#ifdef CONFIG_PM
-static int
-ahd_linux_pci_dev_suspend(struct pci_dev *pdev, pm_message_t mesg)
+static int __maybe_unused
+ahd_linux_pci_dev_suspend(struct device *dev)
{
- struct ahd_softc *ahd = pci_get_drvdata(pdev);
+ struct ahd_softc *ahd = dev_get_drvdata(dev);
int rc;

if ((rc = ahd_suspend(ahd)))
@@ -86,39 +85,20 @@ ahd_linux_pci_dev_suspend(struct pci_dev *pdev, pm_message_t mesg)

ahd_pci_suspend(ahd);

- pci_save_state(pdev);
- pci_disable_device(pdev);
-
- if (mesg.event & PM_EVENT_SLEEP)
- pci_set_power_state(pdev, PCI_D3hot);
-
return rc;
}

-static int
-ahd_linux_pci_dev_resume(struct pci_dev *pdev)
+static int __maybe_unused
+ahd_linux_pci_dev_resume(struct device *dev)
{
- struct ahd_softc *ahd = pci_get_drvdata(pdev);
- int rc;
-
- pci_set_power_state(pdev, PCI_D0);
- pci_restore_state(pdev);
-
- if ((rc = pci_enable_device(pdev))) {
- dev_printk(KERN_ERR, &pdev->dev,
- "failed to enable device after resume (%d)\n", rc);
- return rc;
- }
-
- pci_set_master(pdev);
+ struct ahd_softc *ahd = dev_get_drvdata(dev);

ahd_pci_resume(ahd);

ahd_resume(ahd);

- return rc;
+ return 0;
}
-#endif

static void
ahd_linux_pci_dev_remove(struct pci_dev *pdev)
@@ -224,13 +204,14 @@ ahd_linux_pci_dev_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
return (0);
}

+static SIMPLE_DEV_PM_OPS(ahd_linux_pci_dev_pm_ops,
+ ahd_linux_pci_dev_suspend,
+ ahd_linux_pci_dev_resume);
+
static struct pci_driver aic79xx_pci_driver = {
.name = "aic79xx",
.probe = ahd_linux_pci_dev_probe,
-#ifdef CONFIG_PM
- .suspend = ahd_linux_pci_dev_suspend,
- .resume = ahd_linux_pci_dev_resume,
-#endif
+ .driver.pm = &ahd_linux_pci_dev_pm_ops,
.remove = ahd_linux_pci_dev_remove,
.id_table = ahd_linux_pci_id_table
};
diff --git a/drivers/scsi/aic7xxx/aic79xx_pci.c b/drivers/scsi/aic7xxx/aic79xx_pci.c
index 8397ae93f7dd..2f0bdb9225a4 100644
--- a/drivers/scsi/aic7xxx/aic79xx_pci.c
+++ b/drivers/scsi/aic7xxx/aic79xx_pci.c
@@ -377,8 +377,7 @@ ahd_pci_config(struct ahd_softc *ahd, const struct ahd_pci_identity *entry)
return ahd_pci_map_int(ahd);
}

-#ifdef CONFIG_PM
-void
+void __maybe_unused
ahd_pci_suspend(struct ahd_softc *ahd)
{
/*
@@ -394,7 +393,7 @@ ahd_pci_suspend(struct ahd_softc *ahd)

}

-void
+void __maybe_unused
ahd_pci_resume(struct ahd_softc *ahd)
{
ahd_pci_write_config(ahd->dev_softc, DEVCONFIG,
@@ -404,7 +403,6 @@ ahd_pci_resume(struct ahd_softc *ahd)
ahd_pci_write_config(ahd->dev_softc, CSIZE_LATTIME,
ahd->suspend_state.pci_state.csize_lattime, /*bytes*/1);
}
-#endif

/*
* Perform some simple tests that should catch situations where
--
2.28.0
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