[PATCH v4 21/24] mpi3mr: add support of PM suspend and resume

Kashyap Desai
2021-05-11T19:52:33Z

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Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>

Cc: sathya.prakash@broadcom.com
---
drivers/scsi/mpi3mr/mpi3mr_os.c | 84 +++++++++++++++++++++++++++++++++
1 file changed, 84 insertions(+)

diff --git a/drivers/scsi/mpi3mr/mpi3mr_os.c b/drivers/scsi/mpi3mr/mpi3mr_os.c
index 022356a1cd01..2f494bc8ea0d 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_os.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_os.c
@@ -3398,6 +3398,86 @@ static void mpi3mr_shutdown(struct pci_dev *pdev)
mpi3mr_cleanup_ioc(mrioc, 0);
}

+#ifdef CONFIG_PM
+/**
+ * mpi3mr_suspend - PCI power management suspend callback
+ * @pdev: PCI device instance
+ * @state: New power state
+ *
+ * Change the power state to the given value and cleanup the IOC
+ * by issuing MUR and shutdown notification
+ *
+ * Return: 0 always.
+ */
+static int mpi3mr_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ struct Scsi_Host *shost = pci_get_drvdata(pdev);
+ struct mpi3mr_ioc *mrioc;
+ pci_power_t device_state;
+
+ if (!shost)
+ return 0;
+
+ mrioc = shost_priv(shost);
+ while (mrioc->reset_in_progress || mrioc->is_driver_loading)
+ ssleep(1);
+ mrioc->stop_drv_processing = 1;
+ mpi3mr_cleanup_fwevt_list(mrioc);
+ scsi_block_requests(shost);
+ mpi3mr_stop_watchdog(mrioc);
+ mpi3mr_cleanup_ioc(mrioc, 1);
+
+ device_state = pci_choose_state(pdev, state);
+ ioc_info(mrioc, "pdev=0x%p, slot=%s, entering operating state [D%d]\n",
+ pdev, pci_name(pdev), device_state);
+ pci_save_state(pdev);
+ pci_set_power_state(pdev, device_state);
+ mpi3mr_cleanup_resources(mrioc);
+
+ return 0;
+}
+
+/**
+ * mpi3mr_resume - PCI power management resume callback
+ * @pdev: PCI device instance
+ *
+ * Restore the power state to D0 and reinitialize the controller
+ * and resume I/O operations to the target devices
+ *
+ * Return: 0 on success, non-zero on failure
+ */
+static int mpi3mr_resume(struct pci_dev *pdev)
+{
+ struct Scsi_Host *shost = pci_get_drvdata(pdev);
+ struct mpi3mr_ioc *mrioc;
+ pci_power_t device_state = pdev->current_state;
+ int r;
+
+ mrioc = shost_priv(shost);
+
+ ioc_info(mrioc, "pdev=0x%p, slot=%s, previous operating state [D%d]\n",
+ pdev, pci_name(pdev), device_state);
+ pci_set_power_state(pdev, PCI_D0);
+ pci_enable_wake(pdev, PCI_D0, 0);
+ pci_restore_state(pdev);
+ mrioc->pdev = pdev;
+ mrioc->cpu_count = num_online_cpus();
+ r = mpi3mr_setup_resources(mrioc);
+ if (r) {
+ ioc_info(mrioc, "%s: Setup resources failed[%d]\n",
+ __func__, r);
+ return r;
+ }
+
+ mrioc->stop_drv_processing = 0;
+ mpi3mr_init_ioc(mrioc, 1);
+ scsi_unblock_requests(shost);
+ mpi3mr_start_watchdog(mrioc);
+
+ return 0;
+}
+#endif
+
static const struct pci_device_id mpi3mr_pci_id_table[] = {
{
PCI_DEVICE_SUB(PCI_VENDOR_ID_LSI_LOGIC, 0x00A5,
@@ -3413,6 +3493,10 @@ static struct pci_driver mpi3mr_pci_driver = {
.probe = mpi3mr_probe,
.remove = mpi3mr_remove,
.shutdown = mpi3mr_shutdown,
+#ifdef CONFIG_PM
+ .suspend = mpi3mr_suspend,
+ .resume = mpi3mr_resume,
+#endif
};

static int __init mpi3mr_init(void)