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Message-ID: <20200908165958.GE9948@gmail.com>
Date: Tue, 8 Sep 2020 22:29:58 +0530
From: Vaibhav Gupta <vaibhavgupta40@...il.com>
To: Bjorn Helgaas <helgaas@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Bjorn Helgaas <bjorn@...gaas.com>,
Vaibhav Gupta <vaibhav.varodek@...il.com>,
Adam Radford <aradford@...il.com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Adaptec OEM Raid Solutions <aacraid@...rosemi.com>,
Hannes Reinecke <hare@...e.com>,
Bradley Grove <linuxdrivers@...otech.com>,
John Garry <john.garry@...wei.com>,
Don Brace <don.brace@...rosemi.com>,
James Smart <james.smart@...adcom.com>,
Dick Kennedy <dick.kennedy@...adcom.com>,
Kashyap Desai <kashyap.desai@...adcom.com>,
Sumit Saxena <sumit.saxena@...adcom.com>,
Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
Sathya Prakash <sathya.prakash@...adcom.com>,
Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
Suganath Prabu Subramani
<suganath-prabu.subramani@...adcom.com>,
Jack Wang <jinpu.wang@...ud.ionos.com>
Cc: Shuah Khan <skhan@...uxfoundation.org>,
linux-kernel@...r.kernel.org,
linux-kernel-mentees@...ts.linuxfoundation.org,
linux-scsi@...r.kernel.org, esc.storagedev@...rosemi.com,
megaraidlinux.pdl@...adcom.com, MPT-FusionLinux.pdl@...adcom.com
Subject: Re: [PATCH v2 04/15] scsi: aic79xx: use generic power management
On Mon, Jul 20, 2020 at 07:04:17PM +0530, Vaibhav Gupta wrote:
> With legacy PM hooks, it was the responsibility of a driver to manage PCI
> states and also the device's power state. The generic approach is to let
> the PCI core handle the work.
>
> PCI core passes "struct device*" as an argument to the .suspend() and
> .resume() callbacks.
>
> Driver was using PCI helper functions like pci_save/restore_state(),
> pci_disable/enable_device(), pci_set_power_state() and pci_enable_wake().
> They should not be invoked by the driver.
>
> Also, .suspend() and .resume() were invoking other functions for PM, which
> were againg bounded by "#ifdef CONFIG_PM" directive. Remove them and mark
> them as "__maybe_unused".
>
> Compile-tested only.
>
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.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 e4a09b93d00c..06ee7abd0f8f 100644
> --- a/drivers/scsi/aic7xxx/aic79xx_core.c
> +++ b/drivers/scsi/aic7xxx/aic79xx_core.c
> @@ -7880,11 +7880,9 @@ 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) {
> @@ -7895,15 +7893,13 @@ 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
> --
> 2.27.0
>
.
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