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Date: Tue, 8 Sep 2020 22:34:27 +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 10/15] scsi: pm_8001: use generic power management
On Mon, Jul 20, 2020 at 07:04:23PM +0530, Vaibhav Gupta wrote:
> With legacy PM, drivers themselves were responsible for managing the
> device's power states and takes care of register states.
>
> After upgrading to the generic structure, PCI core will take care of
> required tasks and drivers should do only device-specific operations.
>
> The driver was calling pci_save/restore_state(), pci_choose_state(),
> pci_enable/disable_device() and pci_set_power_state() which is no more
> needed.
>
> Compile-tested only.
>
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>
> ---
> drivers/scsi/pm8001/pm8001_init.c | 46 ++++++++++++-------------------
> 1 file changed, 17 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
> index 9e99262a2b9d..d7d664b87720 100644
> --- a/drivers/scsi/pm8001/pm8001_init.c
> +++ b/drivers/scsi/pm8001/pm8001_init.c
> @@ -1178,23 +1178,21 @@ static void pm8001_pci_remove(struct pci_dev *pdev)
>
> /**
> * pm8001_pci_suspend - power management suspend main entry point
> - * @pdev: PCI device struct
> - * @state: PM state change to (usually PCI_D3)
> + * @dev: Device struct
> *
> * Returns 0 success, anything else error.
> */
> -static int pm8001_pci_suspend(struct pci_dev *pdev, pm_message_t state)
> +static int __maybe_unused pm8001_pci_suspend(struct device *dev)
> {
> + struct pci_dev *pdev = to_pci_dev(dev);
> struct sas_ha_struct *sha = pci_get_drvdata(pdev);
> - struct pm8001_hba_info *pm8001_ha;
> + struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
> int i, j;
> - u32 device_state;
> - pm8001_ha = sha->lldd_ha;
> sas_suspend_ha(sha);
> flush_workqueue(pm8001_wq);
> scsi_block_requests(pm8001_ha->shost);
> if (!pdev->pm_cap) {
> - dev_err(&pdev->dev, " PCI PM not supported\n");
> + dev_err(dev, " PCI PM not supported\n");
> return -ENODEV;
> }
> PM8001_CHIP_DISP->interrupt_disable(pm8001_ha, 0xFF);
> @@ -1217,24 +1215,21 @@ static int pm8001_pci_suspend(struct pci_dev *pdev, pm_message_t state)
> for (j = 0; j < PM8001_MAX_MSIX_VEC; j++)
> tasklet_kill(&pm8001_ha->tasklet[j]);
> #endif
> - device_state = pci_choose_state(pdev, state);
> pm8001_printk("pdev=0x%p, slot=%s, entering "
> - "operating state [D%d]\n", pdev,
> - pm8001_ha->name, device_state);
> - pci_save_state(pdev);
> - pci_disable_device(pdev);
> - pci_set_power_state(pdev, device_state);
> + "suspended state\n", pdev,
> + pm8001_ha->name);
> return 0;
> }
>
> /**
> * pm8001_pci_resume - power management resume main entry point
> - * @pdev: PCI device struct
> + * @dev: Device struct
> *
> * Returns 0 success, anything else error.
> */
> -static int pm8001_pci_resume(struct pci_dev *pdev)
> +static int __maybe_unused pm8001_pci_resume(struct device *dev)
> {
> + struct pci_dev *pdev = to_pci_dev(dev);
> struct sas_ha_struct *sha = pci_get_drvdata(pdev);
> struct pm8001_hba_info *pm8001_ha;
> int rc;
> @@ -1247,17 +1242,8 @@ static int pm8001_pci_resume(struct pci_dev *pdev)
> pm8001_printk("pdev=0x%p, slot=%s, resuming from previous "
> "operating state [D%d]\n", pdev, pm8001_ha->name, device_state);
>
> - pci_set_power_state(pdev, PCI_D0);
> - pci_enable_wake(pdev, PCI_D0, 0);
> - pci_restore_state(pdev);
> - rc = pci_enable_device(pdev);
> - if (rc) {
> - pm8001_printk("slot=%s Enable device failed during resume\n",
> - pm8001_ha->name);
> - goto err_out_enable;
> - }
> + device_wakeup_disable(dev);
>
> - pci_set_master(pdev);
> rc = pci_go_44(pdev);
> if (rc)
> goto err_out_disable;
> @@ -1318,8 +1304,7 @@ static int pm8001_pci_resume(struct pci_dev *pdev)
>
> err_out_disable:
> scsi_remove_host(pm8001_ha->shost);
> - pci_disable_device(pdev);
> -err_out_enable:
> +
> return rc;
> }
>
> @@ -1402,13 +1387,16 @@ static struct pci_device_id pm8001_pci_table[] = {
> {} /* terminate list */
> };
>
> +static SIMPLE_DEV_PM_OPS(pm8001_pci_pm_ops,
> + pm8001_pci_suspend,
> + pm8001_pci_resume);
> +
> static struct pci_driver pm8001_pci_driver = {
> .name = DRV_NAME,
> .id_table = pm8001_pci_table,
> .probe = pm8001_pci_probe,
> .remove = pm8001_pci_remove,
> - .suspend = pm8001_pci_suspend,
> - .resume = pm8001_pci_resume,
> + .driver.pm = &pm8001_pci_pm_ops,
> };
>
> /**
> --
> 2.27.0
>
.
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