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authorMika Westerberg <mika.westerberg@linux.intel.com>2016-06-02 11:17:15 +0300
committerBjorn Helgaas <bhelgaas@google.com>2016-06-13 14:58:53 -0500
commit006d44e49a259b39947366728d65a873a19aadc0 (patch)
tree2aee6e8ae4ae99d50f2f9a5b0964a12e0f12889e
parent16468c783cb4cf72475dcda23fabecb4a4bb0e17 (diff)
downloadlinux-006d44e49a259b39947366728d65a873a19aadc0.tar.gz
PCI: Add runtime PM support for PCIe ports
Add back runtime PM support for PCIe ports that was removed by fe9a743a2601 ("PCI/PM: Drop unused runtime PM support code for PCIe ports"). We cannot enable it automatically for all ports since there have been problems previously [1]. In summary suspended PCIe ports were not able to deal with ACPI-based hotplug reliably. One reason why this might happen is the fact that when a PCIe port is powered down, config space access to the devices behind the port is not possible. If the BIOS hotplug SMI handler assumes the port is always in D0 it will not be able to find the hotplugged devices. To be on the safe side only enable runtime PM if the port does not claim to support hotplug. For PCIe ports not using hotplug, we enable and allow runtime PM automatically. Since 'bridge_d3' can be changed any time we check this in driver ->runtime_idle() and ->runtime_suspend() and only allow runtime suspend if the flag is still set. Use autosuspend with default of 100ms idle time to prevent the port from repeatedly suspending and resuming on continuous configuration space access of devices behind the port. The actual power transition to D3 and back is handled in the PCI core. Idea to automatically unblock (allow) runtime PM for PCIe ports came from Dave Airlie. [1] https://bugzilla.kernel.org/show_bug.cgi?id=53811 This includes a fix for lockdep issue reported by Valdis Kletnieks. Tested-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/pci/pcie/portdrv_core.c3
-rw-r--r--drivers/pci/pcie/portdrv_pci.c51
2 files changed, 54 insertions, 0 deletions
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 32d4d0a3d20e..e9270b4026f3 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pm.h>
+#include <linux/pm_runtime.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/pcieport_if.h>
@@ -342,6 +343,8 @@ static int pcie_device_init(struct pci_dev *pdev, int service, int irq)
return retval;
}
+ pm_runtime_no_callbacks(device);
+
return 0;
}
diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c
index 6c6bb03392ea..70d7ad8c6d17 100644
--- a/drivers/pci/pcie/portdrv_pci.c
+++ b/drivers/pci/pcie/portdrv_pci.c
@@ -93,6 +93,26 @@ static int pcie_port_resume_noirq(struct device *dev)
return 0;
}
+static int pcie_port_runtime_suspend(struct device *dev)
+{
+ return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
+}
+
+static int pcie_port_runtime_resume(struct device *dev)
+{
+ return 0;
+}
+
+static int pcie_port_runtime_idle(struct device *dev)
+{
+ /*
+ * Assume the PCI core has set bridge_d3 whenever it thinks the port
+ * should be good to go to D3. Everything else, including moving
+ * the port to D3, is handled by the PCI core.
+ */
+ return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
+}
+
static const struct dev_pm_ops pcie_portdrv_pm_ops = {
.suspend = pcie_port_device_suspend,
.resume = pcie_port_device_resume,
@@ -101,6 +121,9 @@ static const struct dev_pm_ops pcie_portdrv_pm_ops = {
.poweroff = pcie_port_device_suspend,
.restore = pcie_port_device_resume,
.resume_noirq = pcie_port_resume_noirq,
+ .runtime_suspend = pcie_port_runtime_suspend,
+ .runtime_resume = pcie_port_runtime_resume,
+ .runtime_idle = pcie_port_runtime_idle,
};
#define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops)
@@ -134,11 +157,39 @@ static int pcie_portdrv_probe(struct pci_dev *dev,
return status;
pci_save_state(dev);
+
+ /*
+ * Prevent runtime PM if the port is advertising support for PCIe
+ * hotplug. Otherwise the BIOS hotplug SMI code might not be able
+ * to enumerate devices behind this port properly (the port is
+ * powered down preventing all config space accesses to the
+ * subordinate devices). We can't be sure for native PCIe hotplug
+ * either so prevent that as well.
+ */
+ if (!dev->is_hotplug_bridge) {
+ /*
+ * Keep the port resumed 100ms to make sure things like
+ * config space accesses from userspace (lspci) will not
+ * cause the port to repeatedly suspend and resume.
+ */
+ pm_runtime_set_autosuspend_delay(&dev->dev, 100);
+ pm_runtime_use_autosuspend(&dev->dev);
+ pm_runtime_mark_last_busy(&dev->dev);
+ pm_runtime_put_autosuspend(&dev->dev);
+ pm_runtime_allow(&dev->dev);
+ }
+
return 0;
}
static void pcie_portdrv_remove(struct pci_dev *dev)
{
+ if (!dev->is_hotplug_bridge) {
+ pm_runtime_forbid(&dev->dev);
+ pm_runtime_get_noresume(&dev->dev);
+ pm_runtime_dont_use_autosuspend(&dev->dev);
+ }
+
pcie_port_device_remove(dev);
}