linux-kernel - [PATCH 1/3] pci: Add Designated Vendor Specific Capability

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Date:   Mon,  4 May 2020 18:32:04 -0700
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     bhelgaas@...gle.com, andy@...radead.org,
        alexander.h.duyck@...el.com
Cc:     "David E. Box" <david.e.box@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: [PATCH 1/3] pci: Add Designated Vendor Specific Capability

Add pcie dvsec extended capability id along with helper macros to
retrieve information from the headers.

https://members.pcisig.com/wg/PCI-SIG/document/12335

Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
 include/uapi/linux/pci_regs.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index f9701410d3b5..c96f08d1e711 100644
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -720,6 +720,7 @@
 #define PCI_EXT_CAP_ID_DPC	0x1D	/* Downstream Port Containment */
 #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	/* Desinated Vendor-Specific */
 #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_MAX	PCI_EXT_CAP_ID_PL_16GT
@@ -1062,6 +1063,10 @@
 #define  PCI_L1SS_CTL1_LTR_L12_TH_SCALE	0xe0000000  /* LTR_L1.2_THRESHOLD_Scale */
 #define PCI_L1SS_CTL2		0x0c	/* Control 2 Register */
 
+/* Designated Vendor-Specific (DVSEC, PCI_EXT_CAP_ID_DVSEC) */
+#define PCI_DVSEC_HEADER1		0x4 /* Vendor-Specific Header1 */
+#define PCI_DVSEC_HEADER2		0x8 /* Vendor-Specific Header2 */
+
 /* Data Link Feature */
 #define PCI_DLF_CAP		0x04	/* Capabilities Register */
 #define  PCI_DLF_EXCHANGE_ENABLE	0x80000000  /* Data Link Feature Exchange Enable */
-- 
2.20.1