linux-kernel - [PATCH] PCI: add PCIe 8.0 GT/s supported link speed define

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Message-Id: <1353437939-29210-1-git-send-email-betty.dall@hp.com>
Date:	Tue, 20 Nov 2012 11:58:59 -0700
From:	Betty Dall <betty.dall@...com>
To:	bhelgaas@...gle.com, jbarnes@...tuousgeek.org,
	alex.williamson@...hat.com, wangyijing@...wei.com,
	ddutile@...hat.com
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Betty Dall <betty.dall@...com>
Subject: [PATCH] PCI: add PCIe 8.0 GT/s supported link speed define

Add a new define for the 8.0 GT/s supported link speed added in the PCI
3.0 specification.  This is used to identify a device's current link speed
(PCI_EXP_CLS).

Here is the section of the PCI 3.0 specification:
"Supported Link Speeds Vector – This field indicates the
supported Link speed(s) of the associated Port. For each bit, a
value of 1b indicates that the corresponding Link speed is
supported; otherwise, the Link speed is not supported.
Bit definitions within this field are:
Bit 0 2.5 GT/s
Bit 1 5.0 GT/s
Bit 2 8.0 GT/s
Bits 6:3 RsvdP
Multi-Function devices associated with an Upstream Port must
report the same value in this field for all Functions."

Signed-off-by: Betty Dall <betty.dall@...com>
---
 include/uapi/linux/pci_regs.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index 20ae747..0cf8abb 100644
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -469,6 +469,7 @@
 #define  PCI_EXP_LNKSTA_CLS	0x000f	/* Current Link Speed */
 #define  PCI_EXP_LNKSTA_CLS_2_5GB 0x01	/* Current Link Speed 2.5GT/s */
 #define  PCI_EXP_LNKSTA_CLS_5_0GB 0x02	/* Current Link Speed 5.0GT/s */
+#define  PCI_EXP_LNKSTA_CLS_8_0GB 0x04	/* Current Link Speed 8.0GT/s */
 #define  PCI_EXP_LNKSTA_NLW	0x03f0	/* Nogotiated Link Width */
 #define  PCI_EXP_LNKSTA_NLW_SHIFT 4	/* start of NLW mask in link status */
 #define  PCI_EXP_LNKSTA_LT	0x0800	/* Link Training */
-- 
1.7.7.6

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