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PCI/IOV: Restore VF resizable BAR state after reset

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Similar to regular resizable BARs, VF BARs can also be resized, e.g. by the
system firmware or the PCI subsystem itself.

The capability layout is the same as PCI_EXT_CAP_ID_REBAR.

Add the capability ID and restore it as a part of IOV state.

See PCIe r6.2, sec 7.8.7.

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patch.msgid.link/20250702093522.518099-2-michal.winiarski@intel.com
This commit is contained in:
Michał Winiarski
2025-07-14 14:58:13 -05:00
committed by Bjorn Helgaas
parent 19272b37aa
commit 5a8f77e24a
3 changed files with 50 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/uapi/linux/pci_regs.h
+9
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@@ -745,6 +745,7 @@
#define PCI_EXT_CAP_ID_L1SS 0x1E /* L1 PM Substates */
#define PCI_EXT_CAP_ID_PTM 0x1F /* Precision Time Measurement */
#define PCI_EXT_CAP_ID_DVSEC 0x23 /* Designated Vendor-Specific */
#define PCI_EXT_CAP_ID_VF_REBAR 0x24 /* VF Resizable BAR */
#define PCI_EXT_CAP_ID_DLF 0x25 /* Data Link Feature */
#define PCI_EXT_CAP_ID_PL_16GT 0x26 /* Physical Layer 16.0 GT/s */
#define PCI_EXT_CAP_ID_NPEM 0x29 /* Native PCIe Enclosure Management */
@@ -1141,6 +1142,14 @@
#define PCI_DVSEC_HEADER2 0x8 /* Designated Vendor-Specific Header2 */
#define PCI_DVSEC_HEADER2_ID(x) ((x) & 0xffff)
/* VF Resizable BARs, same layout as PCI_REBAR */
#define PCI_VF_REBAR_CAP PCI_REBAR_CAP
#define PCI_VF_REBAR_CAP_SIZES PCI_REBAR_CAP_SIZES
#define PCI_VF_REBAR_CTRL PCI_REBAR_CTRL
#define PCI_VF_REBAR_CTRL_BAR_IDX PCI_REBAR_CTRL_BAR_IDX
#define PCI_VF_REBAR_CTRL_NBAR_MASK PCI_REBAR_CTRL_NBAR_MASK
#define PCI_VF_REBAR_CTRL_BAR_SIZE PCI_REBAR_CTRL_BAR_SIZE
/* Data Link Feature */
#define PCI_DLF_CAP 0x04 /* Capabilities Register */
#define PCI_DLF_EXCHANGE_ENABLE 0x80000000 /* Data Link Feature Exchange Enable */