The doorbell test relies on the endpoint being able to update inbound
translations at runtime so the host can reach the doorbell target
through a BAR mapping.
If the endpoint does not advertise CAP_DYNAMIC_INBOUND_MAPPING, return
-EOPNOTSUPP from PCITEST_DOORBELL.
This avoids confusing failures in user space and kselftests when the
required capability is not available.
Suggested-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Koichiro Den <den@valinux.co.jp>
---
drivers/misc/pci_endpoint_test.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 74ab5b5b9011..93cd57d20881 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -84,6 +84,7 @@
#define CAP_MSIX BIT(2)
#define CAP_INTX BIT(3)
#define CAP_SUBRANGE_MAPPING BIT(4)
+#define CAP_DYNAMIC_INBOUND_MAPPING BIT(5)
#define PCI_ENDPOINT_TEST_DB_BAR 0x34
#define PCI_ENDPOINT_TEST_DB_OFFSET 0x38
@@ -1060,6 +1061,9 @@ static int pci_endpoint_test_doorbell(struct pci_endpoint_test *test)
u32 addr;
int left;
+ if (!(test->ep_caps & CAP_DYNAMIC_INBOUND_MAPPING))
+ return -EOPNOTSUPP;
+
if (irq_type < PCITEST_IRQ_TYPE_INTX ||
irq_type > PCITEST_IRQ_TYPE_MSIX) {
dev_err(dev, "Invalid IRQ type\n");
--
2.51.0