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Subject[RFC PATCH 3/6] pci bus async shutdown support
Date
Add async shutdown shutdown fields and Convert pci's shutdown logic into
async shutdown calls so that individual pci device drivers can implement
async shutdown.

Signed-off-by: David Jeffery <djeffery@redhat.com>
Tested-by: Laurence Oberman <loberman@redhat.com>

---
drivers/pci/pci-driver.c | 24 ++++++++++++++++++++++--
include/linux/pci.h | 4 ++++
2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 51ec9e7e784f..0ad418905115 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -502,16 +502,28 @@ static void pci_device_remove(struct device *dev)
pci_dev_put(pci_dev);
}

-static void pci_device_shutdown(struct device *dev)
+static void pci_device_async_shutdown_start(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct pci_driver *drv = pci_dev->driver;

pm_runtime_resume(dev);

- if (drv && drv->shutdown)
+ if (drv && drv->async_shutdown_start)
+ drv->async_shutdown_start(pci_dev);
+ else if (drv && drv->shutdown)
drv->shutdown(pci_dev);

+}
+
+static void pci_device_async_shutdown_end(struct device *dev)
+{
+ struct pci_dev *pci_dev = to_pci_dev(dev);
+ struct pci_driver *drv = pci_dev->driver;
+
+ if (drv && drv->async_shutdown_end)
+ drv->async_shutdown_end(pci_dev);
+
/*
* If this is a kexec reboot, turn off Bus Master bit on the
* device to tell it to not continue to do DMA. Don't touch
@@ -523,6 +535,12 @@ static void pci_device_shutdown(struct device *dev)
pci_clear_master(pci_dev);
}

+static void pci_device_shutdown(struct device *dev)
+{
+ pci_device_async_shutdown_start(dev);
+ pci_device_async_shutdown_end(dev);
+}
+
#ifdef CONFIG_PM_SLEEP

/* Auxiliary functions used for system resume */
@@ -1682,6 +1700,8 @@ struct bus_type pci_bus_type = {
.probe = pci_device_probe,
.remove = pci_device_remove,
.shutdown = pci_device_shutdown,
+ .async_shutdown_start = pci_device_async_shutdown_start,
+ .async_shutdown_end = pci_device_async_shutdown_end,
.dev_groups = pci_dev_groups,
.bus_groups = pci_bus_groups,
.drv_groups = pci_drv_groups,
diff --git a/include/linux/pci.h b/include/linux/pci.h
index add9368e6314..6f61325c956a 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -917,6 +917,8 @@ struct module;
* Useful for enabling wake-on-lan (NIC) or changing
* the power state of a device before reboot.
* e.g. drivers/net/e100.c.
+ * @async_shutdown_start: This starts the asynchronous shutdown
+ * @async_shutdown_end: This completes the started asynchronous shutdown
* @sriov_configure: Optional driver callback to allow configuration of
* number of VFs to enable via sysfs "sriov_numvfs" file.
* @sriov_set_msix_vec_count: PF Driver callback to change number of MSI-X
@@ -947,6 +949,8 @@ struct pci_driver {
int (*suspend)(struct pci_dev *dev, pm_message_t state); /* Device suspended */
int (*resume)(struct pci_dev *dev); /* Device woken up */
void (*shutdown)(struct pci_dev *dev);
+ void (*async_shutdown_start)(struct pci_dev *dev);
+ void (*async_shutdown_end)(struct pci_dev *dev);
int (*sriov_configure)(struct pci_dev *dev, int num_vfs); /* On PF */
int (*sriov_set_msix_vec_count)(struct pci_dev *vf, int msix_vec_count); /* On PF */
u32 (*sriov_get_vf_total_msix)(struct pci_dev *pf);
--
2.43.0

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