From 487d828d751d90cf9ca594f45b02dd0e0d712b64 Mon Sep 17 00:00:00 2001 From: Ira Weiny Date: Mon, 26 Sep 2022 14:57:11 -0700 Subject: cxl/doe: Request exclusive DOE access The PCIE Data Object Exchange (DOE) mailbox is a protocol run over configuration cycles. It assumes one initiator at a time. While the kernel has control of the mailbox user space writes could interfere with the kernel access. Mark DOE mailbox config space exclusive when iterated by the CXL driver. Signed-off-by: Ira Weiny Reviewed-by: Jonathan Cameron Link: https://lore.kernel.org/r/20220926215711.2893286-3-ira.weiny@intel.com Signed-off-by: Dan Williams --- include/uapi/linux/pci_regs.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/uapi/linux') diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h index 57b8e2ffb1dd..82a03ea954af 100644 --- a/include/uapi/linux/pci_regs.h +++ b/include/uapi/linux/pci_regs.h @@ -1119,6 +1119,7 @@ #define PCI_DOE_STATUS_DATA_OBJECT_READY 0x80000000 /* Data Object Ready */ #define PCI_DOE_WRITE 0x10 /* DOE Write Data Mailbox Register */ #define PCI_DOE_READ 0x14 /* DOE Read Data Mailbox Register */ +#define PCI_DOE_CAP_SIZEOF 0x18 /* Size of DOE register block */ /* DOE Data Object - note not actually registers */ #define PCI_DOE_DATA_OBJECT_HEADER_1_VID 0x0000ffff -- cgit v1.2.3