Messages in this thread Patch in this message | | | From | Jorgen Hansen <> | Subject | [PATCH v2 4/8] VMCI: dma dg: set OS page size | Date | Thu, 3 Feb 2022 05:12:33 -0800 |
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Tell the device the page size used by the OS.
Reviewed-by: Vishnu Dasa <vdasa@vmware.com> Signed-off-by: Jorgen Hansen <jhansen@vmware.com> --- drivers/misc/vmw_vmci/vmci_guest.c | 9 +++++++++ include/linux/vmw_vmci_defs.h | 1 + 2 files changed, 10 insertions(+)
diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c index 5a99d8e27873..808680dc0820 100644 --- a/drivers/misc/vmw_vmci/vmci_guest.c +++ b/drivers/misc/vmw_vmci/vmci_guest.c @@ -581,6 +581,15 @@ static int vmci_guest_probe_device(struct pci_dev *pdev, /* Let the host know which capabilities we intend to use. */ vmci_write_reg(vmci_dev, caps_in_use, VMCI_CAPS_ADDR); + if (caps_in_use & VMCI_CAPS_DMA_DATAGRAM) { + uint32_t page_shift; + + /* Let the device know the size for pages passed down. */ + vmci_write_reg(vmci_dev, PAGE_SHIFT, VMCI_GUEST_PAGE_SHIFT); + page_shift = vmci_read_reg(vmci_dev, VMCI_GUEST_PAGE_SHIFT); + dev_info(&pdev->dev, "Using page shift %d\n", page_shift); + } + /* Set up global device so that we can start sending datagrams */ spin_lock_irq(&vmci_dev_spinlock); vmci_dev_g = vmci_dev; diff --git a/include/linux/vmw_vmci_defs.h b/include/linux/vmw_vmci_defs.h index 1ce2cffdc3ae..4167779469fd 100644 --- a/include/linux/vmw_vmci_defs.h +++ b/include/linux/vmw_vmci_defs.h @@ -21,6 +21,7 @@ #define VMCI_CAPS_ADDR 0x18 #define VMCI_RESULT_LOW_ADDR 0x1c #define VMCI_RESULT_HIGH_ADDR 0x20 +#define VMCI_GUEST_PAGE_SHIFT 0x34 /* Max number of devices. */ #define VMCI_MAX_DEVICES 1 -- 2.25.1
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