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charset="utf-8" The doorbell test requires the EPC driver to support dynamic inbound mapping so the host can map the doorbell target address into a BAR aperture. Expose epc_features->dynamic_inbound_mapping via a new CAP_DYNAMIC_INBOUND_MAPPING bit in the pci-epf-test capability register, so the host-side pci_endpoint_test driver can detect missing support and return -EOPNOTSUPP instead of running the test fruitlessly. Suggested-by: Niklas Cassel Signed-off-by: Koichiro Den Reviewed-by: Niklas Cassel --- drivers/pci/endpoint/functions/pci-epf-test.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/en= dpoint/functions/pci-epf-test.c index 0cb7af0919dc..c0db207ff143 100644 --- a/drivers/pci/endpoint/functions/pci-epf-test.c +++ b/drivers/pci/endpoint/functions/pci-epf-test.c @@ -64,6 +64,7 @@ #define CAP_MSIX BIT(2) #define CAP_INTX BIT(3) #define CAP_SUBRANGE_MAPPING BIT(4) +#define CAP_DYNAMIC_INBOUND_MAPPING BIT(5) =20 #define PCI_EPF_TEST_BAR_SUBRANGE_NSUB 2 =20 @@ -1102,6 +1103,9 @@ static void pci_epf_test_set_capabilities(struct pci_= epf *epf) if (epf_test->epc_features->intx_capable) caps |=3D CAP_INTX; =20 + if (epf_test->epc_features->dynamic_inbound_mapping) + caps |=3D CAP_DYNAMIC_INBOUND_MAPPING; + if (epf_test->epc_features->dynamic_inbound_mapping && epf_test->epc_features->subrange_mapping) caps |=3D CAP_SUBRANGE_MAPPING; 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charset="utf-8" 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 Signed-off-by: Koichiro Den Reviewed-by: Niklas Cassel --- 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_t= est.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) =20 #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_endp= oint_test *test) u32 addr; int left; =20 + 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"); --=20 2.51.0 From nobody Thu Apr 2 23:55:48 2026 Received: from TYVP286CU001.outbound.protection.outlook.com (mail-japaneastazon11021129.outbound.protection.outlook.com [52.101.125.129]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C69311C3BEB; 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charset="utf-8" PCITEST_DOORBELL may return -EOPNOTSUPP when the endpoint does not advertise CAP_DYNAMIC_INBOUND_MAPPING. Treat this like other optional capabilities and skip the doorbell test instead of reporting a failure. Suggested-by: Niklas Cassel Signed-off-by: Koichiro Den Reviewed-by: Niklas Cassel --- tools/testing/selftests/pci_endpoint/pci_endpoint_test.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/testing/selftests/pci_endpoint/pci_endpoint_test.c b/too= ls/testing/selftests/pci_endpoint/pci_endpoint_test.c index eecb776c33af..e0dbbb2af8c7 100644 --- a/tools/testing/selftests/pci_endpoint/pci_endpoint_test.c +++ b/tools/testing/selftests/pci_endpoint/pci_endpoint_test.c @@ -276,6 +276,8 @@ TEST_F(pcie_ep_doorbell, DOORBELL_TEST) ASSERT_EQ(0, ret) TH_LOG("Can't set AUTO IRQ type"); =20 pci_ep_ioctl(PCITEST_DOORBELL, 0); + if (ret =3D=3D -EOPNOTSUPP) + SKIP(return, "Doorbell test is not supported"); EXPECT_FALSE(ret) TH_LOG("Test failed for Doorbell\n"); } TEST_HARNESS_MAIN --=20 2.51.0