| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Tue, 18 Mar 2014 22:52:02 +0200
From: Tomas Winkler <tomas.winkler@...el.com>
To: gregkh@...uxfoundation.org
Cc: arnd@...db.de, rjw@...ysocki.net, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org, Tomas Winkler <tomas.winkler@...el.com>,
Alexander Usyskin <alexander.usyskin@...el.com>
Subject: [char-misc-next 08/13] mei: me: add runtime pm framework
Add runtime pm framework for ME devices.
The runtime pm handlers are used to run
me power gating isolation protocol
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
---
drivers/misc/mei/hbm.c | 8 +++++
drivers/misc/mei/hw-me.h | 2 ++
drivers/misc/mei/pci-me.c | 92 +++++++++++++++++++++++++++++++++++++++++++++--
3 files changed, 100 insertions(+), 2 deletions(-)
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index a725365..b9a4bb5 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -19,6 +19,7 @@
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/mei.h>
+#include <linux/pm_runtime.h>
#include "mei_dev.h"
#include "hbm.h"
@@ -742,6 +743,13 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
dev->pg_event = MEI_PG_EVENT_RECEIVED;
if (waitqueue_active(&dev->wait_pg))
wake_up(&dev->wait_pg);
+ else
+ /*
+ * If the driver is not waiting on this then
+ * this is HW initiated exit from PG.
+ * Start runtime pm resume sequence to exit from PG.
+ */
+ pm_request_resume(&dev->pdev->dev);
break;
case HOST_CLIENT_PROPERTIES_RES_CMD:
diff --git a/drivers/misc/mei/hw-me.h b/drivers/misc/mei/hw-me.h
index 1d72b55..dbea454 100644
--- a/drivers/misc/mei/hw-me.h
+++ b/drivers/misc/mei/hw-me.h
@@ -23,6 +23,8 @@
#include "mei_dev.h"
#include "client.h"
+#define MEI_ME_RPM_TIMEOUT 500 /* ms */
+
struct mei_me_hw {
void __iomem *mem_addr;
/*
diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index 1c8fd3a..967f2f2 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -33,6 +33,8 @@
#include <linux/interrupt.h>
#include <linux/miscdevice.h>
+#include <linux/pm_runtime.h>
+
#include <linux/mei.h>
#include "mei_dev.h"
@@ -196,6 +198,9 @@ static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
goto release_irq;
}
+ pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_ME_RPM_TIMEOUT);
+ pm_runtime_use_autosuspend(&pdev->dev);
+
err = mei_register(dev);
if (err)
goto release_irq;
@@ -204,6 +209,9 @@ static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
schedule_delayed_work(&dev->timer_work, HZ);
+ if (mei_pg_is_enabled(dev))
+ pm_runtime_put_noidle(&pdev->dev);
+
dev_dbg(&pdev->dev, "initialization successful.\n");
return 0;
@@ -243,6 +251,9 @@ static void mei_me_remove(struct pci_dev *pdev)
if (!dev)
return;
+ if (mei_pg_is_enabled(dev))
+ pm_runtime_get_noresume(&pdev->dev);
+
hw = to_me_hw(dev);
@@ -327,12 +338,89 @@ static int mei_me_pci_resume(struct device *device)
return 0;
}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM_RUNTIME
+static int mei_me_pm_runtime_idle(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct mei_device *dev;
+
+ dev_dbg(&pdev->dev, "rpm: me: runtime_idle\n");
+
+ dev = pci_get_drvdata(pdev);
+ if (!dev)
+ return -ENODEV;
+ if (mei_write_is_idle(dev))
+ pm_schedule_suspend(device, MEI_ME_RPM_TIMEOUT * 2);
+
+ return -EBUSY;
+}
+
+static int mei_me_pm_runtime_suspend(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct mei_device *dev;
+ int ret;
+
+ dev_dbg(&pdev->dev, "rpm: me: runtime suspend\n");
+
+ dev = pci_get_drvdata(pdev);
+ if (!dev)
+ return -ENODEV;
+
+ mutex_lock(&dev->device_lock);
+
+ if (mei_write_is_idle(dev))
+ ret = mei_me_pg_set_sync(dev);
+ else
+ ret = -EAGAIN;
+
+ mutex_unlock(&dev->device_lock);
+
+ dev_dbg(&pdev->dev, "rpm: me: runtime suspend ret=%d\n", ret);
+
+ return ret;
+}
+
+static int mei_me_pm_runtime_resume(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct mei_device *dev;
+ int ret;
+
+ dev_dbg(&pdev->dev, "rpm: me: runtime resume\n");
+
+ dev = pci_get_drvdata(pdev);
+ if (!dev)
+ return -ENODEV;
+
+ mutex_lock(&dev->device_lock);
+
+ ret = mei_me_pg_unset_sync(dev);
+
+ mutex_unlock(&dev->device_lock);
+
+ dev_dbg(&pdev->dev, "rpm: me: runtime resume ret = %d\n", ret);
+
+ return ret;
+}
+#endif /* CONFIG_PM_RUNTIME */
+
+#ifdef CONFIG_PM
+static const struct dev_pm_ops mei_me_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
+ mei_me_pci_resume)
+ SET_RUNTIME_PM_OPS(
+ mei_me_pm_runtime_suspend,
+ mei_me_pm_runtime_resume,
+ mei_me_pm_runtime_idle)
+};
-static SIMPLE_DEV_PM_OPS(mei_me_pm_ops, mei_me_pci_suspend, mei_me_pci_resume);
#define MEI_ME_PM_OPS (&mei_me_pm_ops)
#else
#define MEI_ME_PM_OPS NULL
-#endif /* CONFIG_PM_SLEEP */
+#endif /* CONFIG_PM */
/*
* PCI driver structure
*/
--
1.8.5.3
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists