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Code Issues Releases Wiki Activity

s390/pci: introduce zpci_bus_scan_device()

Browse source 
To match zpci_bus_scan_device() and the PCI common code terminology and
to remove some code duplication, we pull the multiple uses of
pci_scan_single_device() into a function. For now this has the side
effect of adding each device to the PCI bus separately and locking and
unlocking the rescan/remove lock for each instead of just once per bus.
This is clearly less efficient but provides a correct intermediate
behavior until a follow on change does both the adding and scanning only
once per bus.

Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Acked-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Niklas Schnelle 2021-02-11 14:20:03 +01:00 committed by Heiko Carstens
parent 6f8daa2953
commit faf29a4d93
3 changed files with 28 additions and 17 deletions
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9
arch/s390/pci/pci.c
View file

@ -757,7 +757,6 @@ int zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
*/
int zpci_configure_device(struct zpci_dev *zdev, u32 fh)
{
struct pci_dev *pdev;
int rc;
zdev->fh = fh;
@ -777,14 +776,10 @@ int zpci_configure_device(struct zpci_dev *zdev, u32 fh)
if (!zdev->zbus->bus)
return 0;
pdev = pci_scan_single_device(zdev->zbus->bus, zdev->devfn);
if (!pdev)
rc = zpci_bus_scan_device(zdev);
if (rc)
goto error_disable;
pci_bus_add_device(pdev);
pci_lock_rescan_remove();
pci_bus_add_devices(zdev->zbus->bus);
pci_unlock_rescan_remove();
return 0;
error_disable:

35
arch/s390/pci/pci_bus.c
View file

@ -30,6 +30,29 @@ static LIST_HEAD(zbus_list);
static DEFINE_SPINLOCK(zbus_list_lock);
static int zpci_nb_devices;
/* zpci_bus_scan_device - Scan a single device adding it to the PCI core
* @zdev: the zdev to be scanned
*
* Scans the PCI function making it available to the common PCI code.
*
* Return: 0 on success, an error value otherwise
*/
int zpci_bus_scan_device(struct zpci_dev *zdev)
{
struct pci_dev *pdev;
pdev = pci_scan_single_device(zdev->zbus->bus, zdev->devfn);
if (!pdev)
return -ENODEV;
pci_bus_add_device(pdev);
pci_lock_rescan_remove();
pci_bus_add_devices(zdev->zbus->bus);
pci_unlock_rescan_remove();
return 0;
}
/* zpci_bus_remove_device - Removes the given zdev from the PCI core
* @zdev: the zdev to be removed from the PCI core
* @set_error: if true the device's error state is set to permanent failure
@ -176,10 +199,10 @@ void pcibios_bus_add_device(struct pci_dev *pdev)
static int zpci_bus_add_device(struct zpci_bus *zbus, struct zpci_dev *zdev)
{
struct pci_bus *bus;
struct resource_entry *window, *n;
struct resource *res;
struct pci_dev *pdev;
struct pci_bus *bus;
int rc;
bus = zbus->bus;
@ -203,11 +226,7 @@ static int zpci_bus_add_device(struct zpci_bus *zbus, struct zpci_dev *zdev)
pci_bus_add_resource(bus, res, 0);
}
pdev = pci_scan_single_device(bus, zdev->devfn);
if (pdev)
pci_bus_add_device(pdev);
return 0;
return zpci_bus_scan_device(zdev);
}
static void zpci_bus_add_devices(struct zpci_bus *zbus)
@ -217,10 +236,6 @@ static void zpci_bus_add_devices(struct zpci_bus *zbus)
for (i = 1; i < ZPCI_FUNCTIONS_PER_BUS; i++)
if (zbus->function[i])
zpci_bus_add_device(zbus, zbus->function[i]);
pci_lock_rescan_remove();
pci_bus_add_devices(zbus->bus);
pci_unlock_rescan_remove();
}
int zpci_bus_device_register(struct zpci_dev *zdev, struct pci_ops *ops)

1
arch/s390/pci/pci_bus.h
View file

@ -10,6 +10,7 @@
int zpci_bus_device_register(struct zpci_dev *zdev, struct pci_ops *ops);
void zpci_bus_device_unregister(struct zpci_dev *zdev);
int zpci_bus_scan_device(struct zpci_dev *zdev);
void zpci_bus_remove_device(struct zpci_dev *zdev, bool set_error);
void zpci_release_device(struct kref *kref);