[PATCH v3 11/30] s390/pci: add helper function to find device by handle

Matthew Rosato
2022-02-04T21:16:28Z

Intercepted zPCI instructions will specify the desired function via a
function handle. Add a routine to find the device with the specified
handle.

Acked-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
arch/s390/include/asm/pci.h | 1 +
arch/s390/pci/pci.c | 16 ++++++++++++++++
2 files changed, 17 insertions(+)

diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index 7ee52a70a96f..3c0b9986dcdc 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -275,6 +275,7 @@ static inline struct zpci_dev *to_zpci_dev(struct device *dev)
}

struct zpci_dev *get_zdev_by_fid(u32);
+struct zpci_dev *get_zdev_by_fh(u32 fh);

/* DMA */
int zpci_dma_init(void);
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index ca9c29386de6..04c16312ad54 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -76,6 +76,22 @@ struct zpci_dev *get_zdev_by_fid(u32 fid)
return zdev;
}

+struct zpci_dev *get_zdev_by_fh(u32 fh)
+{
+ struct zpci_dev *tmp, *zdev = NULL;
+
+ spin_lock(&zpci_list_lock);
+ list_for_each_entry(tmp, &zpci_list, entry) {
+ if (tmp->fh == fh) {
+ zdev = tmp;
+ break;
+ }
+ }
+ spin_unlock(&zpci_list_lock);
+ return zdev;
+}
+EXPORT_SYMBOL_GPL(get_zdev_by_fh);
+
void zpci_remove_reserved_devices(void)
{
struct zpci_dev *tmp, *zdev;
--
2.27.0