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Subject[PATCH 3/7] scsi: hisi_sas: Add controller runtime PM support for v3 hw
Date
From: Xiang Chen <chenxiang66@hisilicon.com>

Add controller runtime PM support for v3 hw.

Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
---
drivers/scsi/hisi_sas/hisi_sas.h | 2 +
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 56 +++++++++++++++++++++++++-
2 files changed, 56 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index c617ac8d8315..961842ee8906 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -19,6 +19,7 @@
#include <linux/of_address.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/timer.h>
@@ -32,6 +33,7 @@
#define HISI_SAS_MAX_DEVICES HISI_SAS_MAX_ITCT_ENTRIES
#define HISI_SAS_RESET_BIT 0
#define HISI_SAS_REJECT_CMD_BIT 1
+#define HISI_SAS_PM_BIT 2
#define HISI_SAS_MAX_COMMANDS (HISI_SAS_QUEUE_SLOTS)
#define HISI_SAS_RESERVED_IPTT 96
#define HISI_SAS_UNRESERVED_IPTT \
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index e73c124355e5..fa9db57cc3fc 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -3314,6 +3314,17 @@ hisi_sas_v3_probe(struct pci_dev *pdev, const struct pci_device_id *id)

scsi_scan_host(shost);

+ /*
+ * For the situation that there are ATA disks connected with SAS
+ * controller, it addtionly creates ata_port which will affect the
+ * child_count of hisi_hba->dev. Even if suspended all the disks,
+ * ata_port is still and the child_count of hisi_hba->dev is not 0.
+ * So use pm_suspend_ignore_children() to ignore the affect to
+ * hisi_hba->dev.
+ */
+ pm_suspend_ignore_children(dev, true);
+ pm_runtime_put_noidle(&pdev->dev);
+
return 0;

err_out_register_ha:
@@ -3353,6 +3364,7 @@ static void hisi_sas_v3_remove(struct pci_dev *pdev)
struct hisi_hba *hisi_hba = sha->lldd_ha;
struct Scsi_Host *shost = sha->core.shost;

+ pm_runtime_get_noresume(dev);
if (timer_pending(&hisi_hba->timer))
del_timer(&hisi_hba->timer);

@@ -3407,7 +3419,7 @@ enum {
hip08,
};

-static int suspend_v3_hw(struct device *device)
+static int _suspend_v3_hw(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct sas_ha_struct *sha = pci_get_drvdata(pdev);
@@ -3453,7 +3465,7 @@ static int suspend_v3_hw(struct device *device)
return 0;
}

-static int resume_v3_hw(struct device *device)
+static int _resume_v3_hw(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct sas_ha_struct *sha = pci_get_drvdata(pdev);
@@ -3492,6 +3504,34 @@ static int resume_v3_hw(struct device *device)
return 0;
}

+static int suspend_v3_hw(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct sas_ha_struct *sha = pci_get_drvdata(pdev);
+ struct hisi_hba *hisi_hba = sha->lldd_ha;
+ int rc;
+
+ set_bit(HISI_SAS_PM_BIT, &hisi_hba->flags);
+
+ rc = _suspend_v3_hw(device);
+ if (rc)
+ clear_bit(HISI_SAS_PM_BIT, &hisi_hba->flags);
+
+ return rc;
+}
+
+static int resume_v3_hw(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct sas_ha_struct *sha = pci_get_drvdata(pdev);
+ struct hisi_hba *hisi_hba = sha->lldd_ha;
+ int rc = _resume_v3_hw(device);
+
+ clear_bit(HISI_SAS_PM_BIT, &hisi_hba->flags);
+
+ return rc;
+}
+
static const struct pci_device_id sas_v3_pci_table[] = {
{ PCI_VDEVICE(HUAWEI, 0xa230), hip08 },
{}
@@ -3503,8 +3543,20 @@ static const struct pci_error_handlers hisi_sas_err_handler = {
.reset_done = hisi_sas_reset_done_v3_hw,
};

+static int runtime_suspend_v3_hw(struct device *dev)
+{
+ return suspend_v3_hw(dev);
+}
+
+static int runtime_resume_v3_hw(struct device *dev)
+{
+ return resume_v3_hw(dev);
+}
+
static const struct dev_pm_ops hisi_sas_v3_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(suspend_v3_hw, resume_v3_hw)
+ SET_RUNTIME_PM_OPS(runtime_suspend_v3_hw,
+ runtime_resume_v3_hw, NULL)
};

static struct pci_driver sas_v3_pci_driver = {
--
2.26.2
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