[V4,4/7] PCI: Unify try slot and bus reset API

Commit Message

Sinan Kaya June 28, 2018, 7:31 p.m. UTC

Drivers are expected to call pci_try_reset_slot() or pci_try_reset_bus() by
querying if a system supports hotplug or not. A survey showed that most
drivers don't do this and we are leaking hotplug capability to the user.

Hide pci_try_slot_reset() from drivers and embed into pci_try_bus_reset().
Change pci_try_reset_bus() parameter from struct pci_bus to struct pci_dev.

Signed-off-by: Sinan Kaya <[e-mail]>
---
 drivers/infiniband/hw/hfi1/pcie.c |  2 +-
 drivers/pci/pci.c                 | 26 +++++++++++++++++++++-----
 drivers/vfio/pci/vfio_pci.c       |  6 ++----
 include/linux/pci.h               |  3 +--
 4 files changed, 25 insertions(+), 12 deletions(-)

Comments

Andy Shevchenko June 29, 2018, 9:43 p.m. UTC | #1

On Thu, Jun 28, 2018 at 10:31 PM, Sinan Kaya <[e-mail]> wrote:
> Drivers are expected to call pci_try_reset_slot() or pci_try_reset_bus() by
> querying if a system supports hotplug or not. A survey showed that most
> drivers don't do this and we are leaking hotplug capability to the user.
>
> Hide pci_try_slot_reset() from drivers and embed into pci_try_bus_reset().
> Change pci_try_reset_bus() parameter from struct pci_bus to struct pci_dev.

> +/**
> + * pci_try_reset_bus - Try to reset a PCI bus
> + * @pdev: top level PCI device to reset via slot/bus
> + *
> + * Same as above except return -EAGAIN if the bus cannot be locked
> + */
> +int pci_try_reset_bus(struct pci_dev *pdev)
> +{
> +       bool slot = false;
> +
> +       if (!pci_probe_reset_slot(pdev->slot))
> +               slot = true;
> +
> +       return slot ? __pci_try_reset_slot(pdev->slot) :
> +                       __pci_try_reset_bus(pdev->bus);

This can be as simple as

  return pci_probe_reset_slot(pdev->slot) ?
    __pci_try_reset_bus(pdev->slot) : __pci_try_reset_slot(pdev->bus);


> +}
>  EXPORT_SYMBOL_GPL(pci_try_reset_bus);

Sinan Kaya July 2, 2018, 8:40 p.m. UTC | #2

On 6/29/2018 5:43 PM, Andy Shevchenko wrote:
>> +int pci_try_reset_bus(struct pci_dev *pdev)
>> +{
>> +       bool slot = false;
>> +
>> +       if (!pci_probe_reset_slot(pdev->slot))
>> +               slot = true;
>> +
>> +       return slot ? __pci_try_reset_slot(pdev->slot) :
>> +                       __pci_try_reset_bus(pdev->bus);
> This can be as simple as
> 
>   return pci_probe_reset_slot(pdev->slot) ?
>     __pci_try_reset_bus(pdev->slot) : __pci_try_reset_slot(pdev->bus);
> 
> 

done

Patch

diff --git a/drivers/infiniband/hw/hfi1/pcie.c b/drivers/infiniband/hw/hfi1/pcie.c
index 4570c4d..df4f2d3 100644
--- a/drivers/infiniband/hw/hfi1/pcie.c
+++ b/drivers/infiniband/hw/hfi1/pcie.c
@@ -905,7 +905,7 @@  static int trigger_sbr(struct hfi1_devdata *dd)
 	 * delay after a reset is required.  Per spec requirements,
 	 * the link is either working or not after that point.
 	 */
-	return pci_try_reset_bus(dev->bus);
+	return pci_try_reset_bus(dev);
 }
 
 /*
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 236220c..79a1566 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4817,12 +4817,12 @@  int pci_reset_slot(struct pci_slot *slot)
 EXPORT_SYMBOL_GPL(pci_reset_slot);
 
 /**
- * pci_try_reset_slot - Try to reset a PCI slot
+ * __pci_try_reset_slot - Try to reset a PCI slot
  * @slot: PCI slot to reset
  *
  * Same as above except return -EAGAIN if the slot cannot be locked
  */
-int pci_try_reset_slot(struct pci_slot *slot)
+static int __pci_try_reset_slot(struct pci_slot *slot)
 {
 	int rc;
 
@@ -4843,7 +4843,6 @@  int pci_try_reset_slot(struct pci_slot *slot)
 
 	return rc;
 }
-EXPORT_SYMBOL_GPL(pci_try_reset_slot);
 
 static int pci_bus_reset(struct pci_bus *bus, int probe)
 {
@@ -4906,12 +4905,12 @@  int pci_reset_bus(struct pci_bus *bus)
 EXPORT_SYMBOL_GPL(pci_reset_bus);
 
 /**
- * pci_try_reset_bus - Try to reset a PCI bus
+ * __pci_try_reset_bus - Try to reset a PCI bus
  * @bus: top level PCI bus to reset
  *
  * Same as above except return -EAGAIN if the bus cannot be locked
  */
-int pci_try_reset_bus(struct pci_bus *bus)
+static int __pci_try_reset_bus(struct pci_bus *bus)
 {
 	int rc;
 
@@ -4932,6 +4931,23 @@  int pci_try_reset_bus(struct pci_bus *bus)
 
 	return rc;
 }
+
+/**
+ * pci_try_reset_bus - Try to reset a PCI bus
+ * @pdev: top level PCI device to reset via slot/bus
+ *
+ * Same as above except return -EAGAIN if the bus cannot be locked
+ */
+int pci_try_reset_bus(struct pci_dev *pdev)
+{
+	bool slot = false;
+
+	if (!pci_probe_reset_slot(pdev->slot))
+		slot = true;
+
+	return slot ? __pci_try_reset_slot(pdev->slot) :
+			__pci_try_reset_bus(pdev->bus);
+}
 EXPORT_SYMBOL_GPL(pci_try_reset_bus);
 
 /**
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index b423a30..71018ec 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -1010,8 +1010,7 @@  static long vfio_pci_ioctl(void *device_data,
 						    &info, slot);
 		if (!ret)
 			/* User has access, do the reset */
-			ret = slot ? pci_try_reset_slot(vdev->pdev->slot) :
-				     pci_try_reset_bus(vdev->pdev->bus);
+			ret = pci_try_reset_bus(vdev->pdev);
 
 hot_reset_release:
 		for (i--; i >= 0; i--)
@@ -1373,8 +1372,7 @@  static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev)
 	}
 
 	if (needs_reset)
-		ret = slot ? pci_try_reset_slot(vdev->pdev->slot) :
-			     pci_try_reset_bus(vdev->pdev->bus);
+		ret = pci_try_reset_bus(vdev->pdev);
 
 put_devs:
 	for (i = 0; i < devs.cur_index; i++) {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 6b12ce2..f5c85b6 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1096,10 +1096,9 @@  int pci_reset_function_locked(struct pci_dev *dev);
 int pci_try_reset_function(struct pci_dev *dev);
 int pci_probe_reset_slot(struct pci_slot *slot);
 int pci_reset_slot(struct pci_slot *slot);
-int pci_try_reset_slot(struct pci_slot *slot);
 int pci_probe_reset_bus(struct pci_bus *bus);
 int pci_reset_bus(struct pci_bus *bus);
-int pci_try_reset_bus(struct pci_bus *bus);
+int pci_try_reset_bus(struct pci_dev *dev);
 void pci_reset_secondary_bus(struct pci_dev *dev);
 void pcibios_reset_secondary_bus(struct pci_dev *dev);
 void pci_update_resource(struct pci_dev *dev, int resno);