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VMCI: dma dg: set OS page size

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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>
Link: https://lore.kernel.org/r/20220207102725.2742-5-jhansen@vmware.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jorgen Hansen 2022-02-07 02:27:21 -08:00 • committed by Greg Kroah-Hartman
parent eed2298d93
commit 8cb520bea1
2 changed files with 5 additions and 0 deletions
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4
drivers/misc/vmw_vmci/vmci_guest.c
View file

@ -578,6 +578,10 @@ 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);
/* Let the device know the size for pages passed down. */
if (caps_in_use & VMCI_CAPS_DMA_DATAGRAM)
vmci_write_reg(vmci_dev, PAGE_SHIFT, VMCI_GUEST_PAGE_SHIFT);
/* Set up global device so that we can start sending datagrams */
spin_lock_irq(&vmci_dev_spinlock);
vmci_dev_g = vmci_dev;

1
include/linux/vmw_vmci_defs.h
View file

@ -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