linux-kernel - [PATCH v3 3/8] VMCI: dma dg: detect DMA datagram capability

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Date:   Mon,  7 Feb 2022 02:27:20 -0800
From:   Jorgen Hansen <jhansen@...are.com>
To:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Cc:     gregkh@...uxfoundation.org, pv-drivers@...are.com,
        Jorgen Hansen <jhansen@...are.com>,
        Vishnu Dasa <vdasa@...are.com>
Subject: [PATCH v3 3/8] VMCI: dma dg: detect DMA datagram capability

Detect the VMCI DMA datagram capability, and if present, ack it
to the device.

Reviewed-by: Vishnu Dasa <vdasa@...are.com>
Signed-off-by: Jorgen Hansen <jhansen@...are.com>
---
 drivers/misc/vmw_vmci/vmci_guest.c | 11 +++++++++++
 include/linux/vmw_vmci_defs.h      |  1 +
 2 files changed, 12 insertions(+)

diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c
index d30d66258e52..b93afe7f7119 100644
--- a/drivers/misc/vmw_vmci/vmci_guest.c
+++ b/drivers/misc/vmw_vmci/vmci_guest.c
@@ -562,6 +562,17 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
 		}
 	}
 
+	if (mmio_base != NULL) {
+		if (capabilities & VMCI_CAPS_DMA_DATAGRAM) {
+			caps_in_use |= VMCI_CAPS_DMA_DATAGRAM;
+		} else {
+			dev_err(&pdev->dev,
+				"Missing capability: VMCI_CAPS_DMA_DATAGRAM\n");
+			error = -ENXIO;
+			goto err_free_data_buffer;
+		}
+	}
+
 	dev_info(&pdev->dev, "Using capabilities 0x%x\n", caps_in_use);
 
 	/* Let the host know which capabilities we intend to use. */
diff --git a/include/linux/vmw_vmci_defs.h b/include/linux/vmw_vmci_defs.h
index 8fc00e2685cf..1ce2cffdc3ae 100644
--- a/include/linux/vmw_vmci_defs.h
+++ b/include/linux/vmw_vmci_defs.h
@@ -39,6 +39,7 @@
 #define VMCI_CAPS_DATAGRAM      BIT(2)
 #define VMCI_CAPS_NOTIFICATIONS BIT(3)
 #define VMCI_CAPS_PPN64         BIT(4)
+#define VMCI_CAPS_DMA_DATAGRAM  BIT(5)
 
 /* Interrupt Cause register bits. */
 #define VMCI_ICR_DATAGRAM      BIT(0)
-- 
2.25.1