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Date: Fri, 13 Aug 2021 17:50:06 +0800
From: Weili Qian <qianweili@...wei.com>
To: <herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC: <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
<wangzhou1@...ilicon.com>, <liulongfang@...wei.com>
Subject: [PATCH v2 2/5] crypto: hisilicon - add runtime PM ops
Accelerator devices support runtime PM to reduce power consumption.
This patch adds the runtime PM suspend/resume callbacks to the
accelerator devices.
Signed-off-by: Weili Qian <qianweili@...wei.com>
---
drivers/crypto/hisilicon/qm.c | 118 ++++++++++++++++++++++++++++++++++++++++++
drivers/crypto/hisilicon/qm.h | 2 +
2 files changed, 120 insertions(+)
diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index e417cd0..dbe162a 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -5692,6 +5692,124 @@ int hisi_qm_init(struct hisi_qm *qm)
}
EXPORT_SYMBOL_GPL(hisi_qm_init);
+
+static int qm_prepare_for_suspend(struct hisi_qm *qm)
+{
+ struct pci_dev *pdev = qm->pdev;
+ int ret;
+ u32 val;
+
+ ret = qm->ops->set_msi(qm, false);
+ if (ret) {
+ pci_err(pdev, "failed to disable MSI before suspending!\n");
+ return ret;
+ }
+
+ /* shutdown OOO register */
+ writel(ACC_MASTER_GLOBAL_CTRL_SHUTDOWN,
+ qm->io_base + ACC_MASTER_GLOBAL_CTRL);
+
+ ret = readl_relaxed_poll_timeout(qm->io_base + ACC_MASTER_TRANS_RETURN,
+ val,
+ (val == ACC_MASTER_TRANS_RETURN_RW),
+ POLL_PERIOD, POLL_TIMEOUT);
+ if (ret) {
+ pci_emerg(pdev, "Bus lock! Please reset system.\n");
+ return ret;
+ }
+
+ ret = qm_set_pf_mse(qm, false);
+ if (ret)
+ pci_err(pdev, "failed to disable MSE before suspending!\n");
+
+ return ret;
+}
+
+static int qm_rebuild_for_resume(struct hisi_qm *qm)
+{
+ struct pci_dev *pdev = qm->pdev;
+ int ret;
+
+ ret = qm_set_pf_mse(qm, true);
+ if (ret) {
+ pci_err(pdev, "failed to enable MSE after resuming!\n");
+ return ret;
+ }
+
+ ret = qm->ops->set_msi(qm, true);
+ if (ret) {
+ pci_err(pdev, "failed to enable MSI after resuming!\n");
+ return ret;
+ }
+
+ ret = qm_dev_hw_init(qm);
+ if (ret) {
+ pci_err(pdev, "failed to init device after resuming\n");
+ return ret;
+ }
+
+ qm_cmd_init(qm);
+ hisi_qm_dev_err_init(qm);
+
+ return 0;
+}
+
+/**
+ * hisi_qm_suspend() - Runtime suspend of given device.
+ * @dev: device to suspend.
+ *
+ * Function that suspend the device.
+ */
+int hisi_qm_suspend(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct hisi_qm *qm = pci_get_drvdata(pdev);
+ int ret;
+
+ pci_info(pdev, "entering suspended state\n");
+
+ ret = hisi_qm_stop(qm, QM_NORMAL);
+ if (ret) {
+ pci_err(pdev, "failed to stop qm(%d)\n", ret);
+ return ret;
+ }
+
+ ret = qm_prepare_for_suspend(qm);
+ if (ret)
+ pci_err(pdev, "failed to prepare suspended(%d)\n", ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(hisi_qm_suspend);
+
+/**
+ * hisi_qm_resume() - Runtime resume of given device.
+ * @dev: device to resume.
+ *
+ * Function that resume the device.
+ */
+int hisi_qm_resume(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct hisi_qm *qm = pci_get_drvdata(pdev);
+ int ret;
+
+ pci_info(pdev, "resuming from suspend state\n");
+
+ ret = qm_rebuild_for_resume(qm);
+ if (ret) {
+ pci_err(pdev, "failed to rebuild resume(%d)\n", ret);
+ return ret;
+ }
+
+ ret = hisi_qm_start(qm);
+ if (ret)
+ pci_err(pdev, "failed to start qm(%d)\n", ret);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(hisi_qm_resume);
+
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Zhou Wang <wangzhou1@...ilicon.com>");
MODULE_DESCRIPTION("HiSilicon Accelerator queue manager driver");
diff --git a/drivers/crypto/hisilicon/qm.h b/drivers/crypto/hisilicon/qm.h
index 0e5df1c..59e1646 100644
--- a/drivers/crypto/hisilicon/qm.h
+++ b/drivers/crypto/hisilicon/qm.h
@@ -431,5 +431,7 @@ void hisi_qm_dev_shutdown(struct pci_dev *pdev);
void hisi_qm_wait_task_finish(struct hisi_qm *qm, struct hisi_qm_list *qm_list);
int hisi_qm_alg_register(struct hisi_qm *qm, struct hisi_qm_list *qm_list);
void hisi_qm_alg_unregister(struct hisi_qm *qm, struct hisi_qm_list *qm_list);
+int hisi_qm_resume(struct device *dev);
+int hisi_qm_suspend(struct device *dev);
void hisi_qm_regs_dump(struct seq_file *s, struct debugfs_regset32 *regset);
#endif
--
2.8.1
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