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Date: Mon, 20 Jul 2020 19:04:14 +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: Vaibhav Gupta <vaibhavgupta40@...il.com>,
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: [PATCH v2 01/15] scsi: megaraid_sas: use generic power management
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. As the .suspend() work with "struct instance*",
extract it from "struct device*" using dev_get_drv_data().
Driver was also 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.
Compile-tested only.
Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>
---
drivers/scsi/megaraid/megaraid_sas_base.c | 61 ++++++-----------------
1 file changed, 16 insertions(+), 45 deletions(-)
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 00668335c2af..4a6ee7778977 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -7539,25 +7539,21 @@ static void megasas_shutdown_controller(struct megasas_instance *instance,
megasas_return_cmd(instance, cmd);
}
-#ifdef CONFIG_PM
/**
* megasas_suspend - driver suspend entry point
- * @pdev: PCI device structure
- * @state: PCI power state to suspend routine
+ * @dev: Device structure
*/
-static int
-megasas_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused
+megasas_suspend(struct device *dev)
{
- struct megasas_instance *instance;
-
- instance = pci_get_drvdata(pdev);
+ struct megasas_instance *instance = dev_get_drvdata(dev);
if (!instance)
return 0;
instance->unload = 1;
- dev_info(&pdev->dev, "%s is called\n", __func__);
+ dev_info(dev, "%s is called\n", __func__);
/* Shutdown SR-IOV heartbeat timer */
if (instance->requestorId && !instance->skip_heartbeat_timer_del)
@@ -7579,7 +7575,7 @@ megasas_suspend(struct pci_dev *pdev, pm_message_t state)
tasklet_kill(&instance->isr_tasklet);
- pci_set_drvdata(instance->pdev, instance);
+ dev_set_drvdata(dev, instance);
instance->instancet->disable_intr(instance);
megasas_destroy_irqs(instance);
@@ -7587,48 +7583,28 @@ megasas_suspend(struct pci_dev *pdev, pm_message_t state)
if (instance->msix_vectors)
pci_free_irq_vectors(instance->pdev);
- pci_save_state(pdev);
- pci_disable_device(pdev);
-
- pci_set_power_state(pdev, pci_choose_state(pdev, state));
-
return 0;
}
/**
* megasas_resume- driver resume entry point
- * @pdev: PCI device structure
+ * @dev: Device structure
*/
-static int
-megasas_resume(struct pci_dev *pdev)
+static int __maybe_unused
+megasas_resume(struct device *dev)
{
int rval;
struct Scsi_Host *host;
- struct megasas_instance *instance;
+ struct megasas_instance *instance = dev_get_drvdata(dev);
u32 status_reg;
- instance = pci_get_drvdata(pdev);
-
if (!instance)
return 0;
host = instance->host;
- pci_set_power_state(pdev, PCI_D0);
- pci_enable_wake(pdev, PCI_D0, 0);
- pci_restore_state(pdev);
+ device_wakeup_disable(dev);
- dev_info(&pdev->dev, "%s is called\n", __func__);
- /*
- * PCI prepping: enable device set bus mastering and dma mask
- */
- rval = pci_enable_device_mem(pdev);
-
- if (rval) {
- dev_err(&pdev->dev, "Enable device failed\n");
- return rval;
- }
-
- pci_set_master(pdev);
+ dev_info(dev, "%s is called\n", __func__);
/*
* We expect the FW state to be READY
@@ -7754,14 +7730,8 @@ megasas_resume(struct pci_dev *pdev)
fail_set_dma_mask:
fail_ready_state:
- pci_disable_device(pdev);
-
return -ENODEV;
}
-#else
-#define megasas_suspend NULL
-#define megasas_resume NULL
-#endif
static inline int
megasas_wait_for_adapter_operational(struct megasas_instance *instance)
@@ -7931,7 +7901,7 @@ static void megasas_detach_one(struct pci_dev *pdev)
/**
* megasas_shutdown - Shutdown entry point
- * @device: Generic device structure
+ * @pdev: PCI device structure
*/
static void megasas_shutdown(struct pci_dev *pdev)
{
@@ -8508,6 +8478,8 @@ static const struct file_operations megasas_mgmt_fops = {
.llseek = noop_llseek,
};
+static SIMPLE_DEV_PM_OPS(megasas_pm_ops, megasas_suspend, megasas_resume);
+
/*
* PCI hotplug support registration structure
*/
@@ -8517,8 +8489,7 @@ static struct pci_driver megasas_pci_driver = {
.id_table = megasas_pci_table,
.probe = megasas_probe_one,
.remove = megasas_detach_one,
- .suspend = megasas_suspend,
- .resume = megasas_resume,
+ .driver.pm = &megasas_pm_ops,
.shutdown = megasas_shutdown,
};
--
2.27.0
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