linux-kernel - NTB driver support in haswell platform?

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Date:	Wed, 11 Jun 2014 17:03:38 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Jon Mason <jon.mason@...el.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: NTB driver support in haswell platform?

Hi Jon,
   I have a Intel Haswell platform in hand, and our team want to use NTB in this platform.
I checked the current intel NTB driver in Linux kernel, I found the Haswell NTB pci device id
is not contained in ntb_pci_tbl[]. I want to know whether current kernel ntb driver can support
the ntb device in Haswell platform ?

Haswell NTB device id:

>From Haswell EDS 7.4.2

did
Bus: 0 Device: 3 Function: 0 Offset: 2
Bit Attr Default Description
15:0 RO-V 2F08h Device_Identification_Number — Device ID values vary from function to function.
Bits 15:8 are equal to 0x2F. The following list is a breakdown of the function groups.
  0x2F00 - 0x2F1F : PCI Express and DMI2
  0x2F20 - 0x2F3F : Integrated I/O Features
  0x2F40 - 0x2F5F : Performance Monitors
  0x2F80 - 0x2F9F : Intel QPI
  0x2FA0 - 0x2FBF : Home Agent/Memory Controller
  0x2FC0 - 0x2FDF : Power Management
  0x2FE0 - 0x2FFF : Cbo/Ring
Default value may vary based on bus, device, and function of this CSR location.

Current ntb_pci_tbl[] in Linux:

#define PCI_DEVICE_ID_INTEL_NTB_B2B_JSF		0x3725
#define PCI_DEVICE_ID_INTEL_NTB_PS_JSF		0x3726
#define PCI_DEVICE_ID_INTEL_NTB_SS_JSF		0x3727
#define PCI_DEVICE_ID_INTEL_NTB_B2B_SNB		0x3C0D
#define PCI_DEVICE_ID_INTEL_NTB_PS_SNB		0x3C0E
#define PCI_DEVICE_ID_INTEL_NTB_SS_SNB		0x3C0F
#define PCI_DEVICE_ID_INTEL_NTB_B2B_IVT		0x0E0D
#define PCI_DEVICE_ID_INTEL_NTB_PS_IVT		0x0E0E
#define PCI_DEVICE_ID_INTEL_NTB_SS_IVT		0x0E0F
#define PCI_DEVICE_ID_INTEL_NTB_B2B_HSX		0x2F0D
#define PCI_DEVICE_ID_INTEL_NTB_PS_HSX		0x2F0E
#define PCI_DEVICE_ID_INTEL_NTB_SS_HSX		0x2F0F
#define PCI_DEVICE_ID_INTEL_NTB_B2B_BWD		0x0C4E

So we should modify the default device id to 0x2F0D, 0x2F0E or 0x2F0F ?
What's the difference between them?

Thanks!
Yijing.

-- 
Thanks!
Yijing

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