Currently, there is no way for the pci-endpoint-test driver (RC side),
to know which features the EPC supports.
Expose some of the EPC:s capabilities in the test_reg_bar, such that
the pci-endpoint-test driver can know if a feature (e.g. MSI-X or DMA)
is supported before attempting to test it.
Signed-off-by: Niklas Cassel <cassel@xxxxxxxxxx>
---
drivers/misc/pci_endpoint_test.c | 34 +++++++++++++++
drivers/pci/endpoint/functions/pci-epf-test.c | 43 +++++++++++++++++++
2 files changed, 77 insertions(+)
diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 3aaaf47fa4ee..7eb045dc81b6 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -69,6 +69,20 @@
#define PCI_ENDPOINT_TEST_FLAGS 0x2c
#define FLAG_USE_DMA BIT(0)
+#define CAPS_MAGIC 0x25ccf687
+#define PCI_ENDPOINT_TEST_CAPS_MAGIC 0x30
+#define PCI_ENDPOINT_TEST_CAPS_VERSION 0x34
+#define PCI_ENDPOINT_TEST_CAPS 0x38
+
+#define CAPS_MSI_SUPPORT BIT(0)
+#define CAPS_MSIX_SUPPORT BIT(1)
+#define CAPS_DMA_SUPPORT BIT(2)
+#define CAPS_DMA_IS_PRIVATE BIT(3) /* only valid if DMA_SUPPORT */
+#define CAPS_DOORBELL_SUPPORT BIT(4)
+#define CAPS_DOORBELL_BAR_MASK GENMASK(7, 5) /* only valid if DOORBELL_SUPPORT */
+#define CAPS_DOORBELL_BAR_SHIFT 5
+#define CAPS_DOORBELL_BAR(x) (((x) & CAPS_DOORBELL_BAR_MASK) >> CAPS_DOORBELL_BAR_SHIFT)
+
#define PCI_DEVICE_ID_TI_AM654 0xb00c
#define PCI_DEVICE_ID_TI_J7200 0xb00f
#define PCI_DEVICE_ID_TI_AM64 0xb010
@@ -805,6 +819,24 @@ static const struct file_operations pci_endpoint_test_fops = {
.unlocked_ioctl = pci_endpoint_test_ioctl,
};
+static void pci_endpoint_get_caps(struct pci_endpoint_test *test)
+{
+ u32 caps_magic, caps;
+
+ /* check if endpoint has CAPS support */
+ caps_magic = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_CAPS_MAGIC);
+ if (caps_magic != CAPS_MAGIC)
+ return;
+
+ caps = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_CAPS);
+ pr_info("CAPS: MSI support: %u\n", (caps & CAPS_MSI_SUPPORT) ? 1 : 0);
+ pr_info("CAPS: MSI-X support: %u\n", (caps & CAPS_MSIX_SUPPORT) ? 1 : 0);
+ pr_info("CAPS: DMA support: %u\n", (caps & CAPS_DMA_SUPPORT) ? 1 : 0);
+ pr_info("CAPS: DMA is private: %u\n", (caps & CAPS_DMA_IS_PRIVATE) ? 1 : 0);
+ pr_info("CAPS: DOORBELL support: %u\n", (caps & CAPS_DOORBELL_SUPPORT) ? 1 : 0);
+ pr_info("CAPS: DOORBELL BAR: %lu\n", CAPS_DOORBELL_BAR(caps));
+}
+
static int pci_endpoint_test_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
@@ -906,6 +938,8 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
goto err_kfree_test_name;
}
+ pci_endpoint_get_caps(test);
+
misc_device = &test->miscdev;
misc_device->minor = MISC_DYNAMIC_MINOR;
misc_device->name = kstrdup(name, GFP_KERNEL);
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index a73bc0771d35..2dd90e2e8565 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -44,6 +44,18 @@
#define TIMER_RESOLUTION 1
+#define CAPS_MAGIC 0x25ccf687
+#define CAPS_VERSION 0x1
+
+#define CAPS_MSI_SUPPORT BIT(0)
+#define CAPS_MSIX_SUPPORT BIT(1)
+#define CAPS_DMA_SUPPORT BIT(2)
+#define CAPS_DMA_IS_PRIVATE BIT(3) /* only valid if DMA_SUPPORT */
+#define CAPS_DOORBELL_SUPPORT BIT(4)
+#define CAPS_DOORBELL_BAR_MASK GENMASK(7, 5) /* only valid if DOORBELL_SUPPORT */
+#define CAPS_DOORBELL_BAR_SHIFT 5
+#define CAPS_DOORBELL_BAR(x) (((x) & CAPS_DOORBELL_BAR_MASK) >> CAPS_DOORBELL_BAR_SHIFT)
+
static struct workqueue_struct *kpcitest_workqueue;
struct pci_epf_test {
@@ -74,6 +86,9 @@ struct pci_epf_test_reg {
u32 irq_type;
u32 irq_number;
u32 flags;
+ u32 caps_magic;
+ u32 caps_version;
+ u32 caps;
} __packed;
static struct pci_epf_header test_header = {
@@ -741,6 +756,32 @@ static void pci_epf_test_clear_bar(struct pci_epf *epf)
}
}
+static void pci_epf_test_init_caps(struct pci_epf *epf)
+{
+ struct pci_epf_test *epf_test = epf_get_drvdata(epf);
+ const struct pci_epc_features *epc_features = epf_test->epc_features;
+ enum pci_barno test_reg_bar = epf_test->test_reg_bar;
+ struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
+ u32 caps = 0;
+
+ reg->caps_magic = cpu_to_le32(CAPS_MAGIC);
+ reg->caps_version = cpu_to_le32(CAPS_VERSION);
+
+ if (epc_features->msi_capable)
+ caps |= CAPS_MSI_SUPPORT;
+
+ if (epc_features->msix_capable)
+ caps |= CAPS_MSIX_SUPPORT;
+
+ if (epf_test->dma_supported)
+ caps |= CAPS_DMA_SUPPORT;
+
+ if (epf_test->dma_private)
+ caps |= CAPS_DMA_IS_PRIVATE;
+
+ reg->caps = cpu_to_le64(caps);
+}
+
static int pci_epf_test_epc_init(struct pci_epf *epf)
{
struct pci_epf_test *epf_test = epf_get_drvdata(epf);
@@ -765,6 +806,8 @@ static int pci_epf_test_epc_init(struct pci_epf *epf)
}
}
+ pci_epf_test_init_caps(epf);
+
ret = pci_epf_test_set_bar(epf);
if (ret)
return ret;
--
2.47.0
