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-rw-r--r--include/linux/pci-epc.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 4ccb4f4f3883..cc2f70d061c8 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -164,6 +164,11 @@ enum pci_epc_bar_type {
* should be configured as 32-bit or 64-bit, the EPF driver must
* configure this BAR as 64-bit. Additionally, the BAR succeeding
* this BAR must be set to type BAR_RESERVED.
+ *
+ * only_64bit should not be set on a BAR of type BAR_RESERVED.
+ * (If BARx is a 64-bit BAR that an EPF driver is not allowed to
+ * touch, then both BARx and BARx+1 must be set to type
+ * BAR_RESERVED.)
*/
struct pci_epc_bar_desc {
enum pci_epc_bar_type type;