This commit modifies the Resizable BAR Capability Register fields to better
support varying BAR sizes. Additionally, the function `pci_rebar_get_possible_sizes`
has been updated with a more detailed comment to clarify its role in querying
and returning the supported BAR sizes.
For more details, refer to PCI Express庐 Base Specification Revision 5.0, Section 7.8.6.2.
Signed-off-by: Zhiyuan Dai <daizhiyuan@xxxxxxxxxxxxxx>
---
drivers/pci/pci.c | 2 +-
include/uapi/linux/pci_regs.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 661f98c6c63a..03fe5e6e1d72 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3752,7 +3752,7 @@ static int pci_rebar_find_pos(struct pci_dev *pdev, int bar)
* @bar: BAR to query
*
* Get the possible sizes of a resizable BAR as bitmask defined in the spec
- * (bit 0=1MB, bit 19=512GB). Returns 0 if BAR isn't resizable.
+ * (bit 0=1MB, bit 31=128TB). Returns 0 if BAR isn't resizable.
*/
u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar)
{
diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index 1601c7ed5fab..ce99d4f34ce5 100644
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -1013,7 +1013,7 @@
/* Resizable BARs */
#define PCI_REBAR_CAP 4 /* capability register */
-#define PCI_REBAR_CAP_SIZES 0x00FFFFF0 /* supported BAR sizes */
+#define PCI_REBAR_CAP_SIZES 0xFFFFFFF0 /* supported BAR sizes */
#define PCI_REBAR_CTRL 8 /* control register */
#define PCI_REBAR_CTRL_BAR_IDX 0x00000007 /* BAR index */
#define PCI_REBAR_CTRL_NBAR_MASK 0x000000E0 /* # of resizable BARs */
--
2.43.0
