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.
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| @@ -1119,6 +1119,7 @@ · 1118 unmodified lines | ||
| 1119 | 1119 | #define PCI_DOE_STATUS_DATA_OBJECT_READY 0x80000000 /* Data Object Ready */ |
| 1120 | 1120 | #define PCI_DOE_WRITE 0x10 /* DOE Write Data Mailbox Register */ |
| 1121 | 1121 | #define PCI_DOE_READ 0x14 /* DOE Read Data Mailbox Register */ |
| 1122 | +#define PCI_DOE_CAP_SIZEOF 0x18 /* Size of DOE register block */ | |
| 1122 | 1123 | |
| 1123 | 1124 | /* DOE Data Object - note not actually registers */ |
| 1124 | 1125 | #define PCI_DOE_DATA_OBJECT_HEADER_1_VID 0x0000ffff |