diff options
| author | Jorgen Hansen <jhansen@vmware.com> | 2022-02-07 02:27:20 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-08 12:15:58 +0100 |
| commit | eed2298d936087a1c85e0fa6f7170028e4f4fded (patch) | |
| tree | 4c290ad50b939625e4521cc0a24268f8b3e134ef | |
| parent | e283a0e8b7ea83915e988ed059384af166b444c0 (diff) | |
| download | lwn-eed2298d936087a1c85e0fa6f7170028e4f4fded.tar.gz lwn-eed2298d936087a1c85e0fa6f7170028e4f4fded.zip | |
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@vmware.com>
Signed-off-by: Jorgen Hansen <jhansen@vmware.com>
Link: https://lore.kernel.org/r/20220207102725.2742-4-jhansen@vmware.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/misc/vmw_vmci/vmci_guest.c | 11 | ||||
| -rw-r--r-- | include/linux/vmw_vmci_defs.h | 1 |
2 files changed, 12 insertions, 0 deletions
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) |