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NTB: Add support for AMD PCI-Express Non-Transparent Bridge 

This adds support for AMD's PCI-Express Non-Transparent Bridge
(NTB) device on the Zeppelin platform. The driver connnects to the
standard NTB sub-system interface, with modification to add hooks
for power management in a separate patch. The AMD NTB device has 3
memory windows, 16 doorbell, 16 scratch-pad registers, and supports
up to 16 PCIe lanes running a Gen3 speeds.

Signed-off-by: Xiangliang Yu <Xiangliang.Yu@amd.com>
Reviewed-by: Allen Hubbe <Allen.Hubbe@emc.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Xiangliang Yu 2016-01-21 19:47:05 +08:00 committed by Jon Mason
parent 8a7b6a778a
commit a1b3695820
7 changed files with 1376 additions and 0 deletions
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6
MAINTAINERS
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@ -7586,6 +7586,12 @@ W: https://github.com/jonmason/ntb/wiki
T: git git://github.com/jonmason/ntb.git
F: drivers/ntb/hw/intel/
NTB AMD DRIVER
M: Xiangliang Yu <Xiangliang.Yu@amd.com>
L: linux-ntb@googlegroups.com
S: Supported
F: drivers/ntb/hw/amd/
NTFS FILESYSTEM
M: Anton Altaparmakov <anton@tuxera.com>
L: linux-ntfs-dev@lists.sourceforge.net

1
drivers/ntb/hw/Kconfig
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source "drivers/ntb/hw/amd/Kconfig"
source "drivers/ntb/hw/intel/Kconfig"

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drivers/ntb/hw/Makefile
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obj-$(CONFIG_NTB_AMD) += amd/
obj-$(CONFIG_NTB_INTEL) += intel/

7
drivers/ntb/hw/amd/Kconfig Normal file
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@ -0,0 +1,7 @@
config NTB_AMD
tristate "AMD Non-Transparent Bridge support"
depends on X86_64
help
This driver supports AMD NTB on capable Zeppelin hardware.
If unsure, say N.

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drivers/ntb/hw/amd/Makefile Normal file
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obj-$(CONFIG_NTB_AMD) += ntb_hw_amd.o

1143
drivers/ntb/hw/amd/ntb_hw_amd.c Normal file
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drivers/ntb/hw/amd/ntb_hw_amd.h Normal file
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/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright (C) 2016 Advanced Micro Devices, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* BSD LICENSE
*
* Copyright (C) 2016 Advanced Micro Devices, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copy
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of AMD Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* AMD PCIe NTB Linux driver
*
* Contact Information:
* Xiangliang Yu <Xiangliang.Yu@amd.com>
*/
#ifndef NTB_HW_AMD_H
#define NTB_HW_AMD_H
#include <linux/ntb.h>
#include <linux/pci.h>
#define PCI_DEVICE_ID_AMD_NTB 0x145B
#define AMD_LINK_HB_TIMEOUT msecs_to_jiffies(1000)
#define AMD_LINK_STATUS_OFFSET 0x68
#define NTB_LIN_STA_ACTIVE_BIT 0x00000002
#define NTB_LNK_STA_SPEED_MASK 0x000F0000
#define NTB_LNK_STA_WIDTH_MASK 0x03F00000
#define NTB_LNK_STA_ACTIVE(x) (!!((x) & NTB_LIN_STA_ACTIVE_BIT))
#define NTB_LNK_STA_SPEED(x) (((x) & NTB_LNK_STA_SPEED_MASK) >> 16)
#define NTB_LNK_STA_WIDTH(x) (((x) & NTB_LNK_STA_WIDTH_MASK) >> 20)
#ifndef read64
#ifdef readq
#define read64 readq
#else
#define read64 _read64
static inline u64 _read64(void __iomem *mmio)
{
u64 low, high;
low = readl(mmio);
high = readl(mmio + sizeof(u32));
return low | (high << 32);
}
#endif
#endif
#ifndef write64
#ifdef writeq
#define write64 writeq
#else
#define write64 _write64
static inline void _write64(u64 val, void __iomem *mmio)
{
writel(val, mmio);
writel(val >> 32, mmio + sizeof(u32));
}
#endif
#endif
enum {
/* AMD NTB Capability */
AMD_MW_CNT = 3,
AMD_DB_CNT = 16,
AMD_MSIX_VECTOR_CNT = 24,
AMD_SPADS_CNT = 16,
/* AMD NTB register offset */
AMD_CNTL_OFFSET = 0x200,
/* NTB control register bits */
PMM_REG_CTL = BIT(21),
SMM_REG_CTL = BIT(20),
SMM_REG_ACC_PATH = BIT(18),
PMM_REG_ACC_PATH = BIT(17),
NTB_CLK_EN = BIT(16),
AMD_STA_OFFSET = 0x204,
AMD_PGSLV_OFFSET = 0x208,
AMD_SPAD_MUX_OFFSET = 0x20C,
AMD_SPAD_OFFSET = 0x210,
AMD_RSMU_HCID = 0x250,
AMD_RSMU_SIID = 0x254,
AMD_PSION_OFFSET = 0x300,
AMD_SSION_OFFSET = 0x330,
AMD_MMINDEX_OFFSET = 0x400,
AMD_MMDATA_OFFSET = 0x404,
AMD_SIDEINFO_OFFSET = 0x408,
AMD_SIDE_MASK = BIT(0),
AMD_SIDE_READY = BIT(1),
/* limit register */
AMD_ROMBARLMT_OFFSET = 0x410,
AMD_BAR1LMT_OFFSET = 0x414,
AMD_BAR23LMT_OFFSET = 0x418,
AMD_BAR45LMT_OFFSET = 0x420,
/* xlat address */
AMD_POMBARXLAT_OFFSET = 0x428,
AMD_BAR1XLAT_OFFSET = 0x430,
AMD_BAR23XLAT_OFFSET = 0x438,
AMD_BAR45XLAT_OFFSET = 0x440,
/* doorbell and interrupt */
AMD_DBFM_OFFSET = 0x450,
AMD_DBREQ_OFFSET = 0x454,
AMD_MIRRDBSTAT_OFFSET = 0x458,
AMD_DBMASK_OFFSET = 0x45C,
AMD_DBSTAT_OFFSET = 0x460,
AMD_INTMASK_OFFSET = 0x470,
AMD_INTSTAT_OFFSET = 0x474,
/* event type */
AMD_PEER_FLUSH_EVENT = BIT(0),
AMD_PEER_RESET_EVENT = BIT(1),
AMD_PEER_D3_EVENT = BIT(2),
AMD_PEER_PMETO_EVENT = BIT(3),
AMD_PEER_D0_EVENT = BIT(4),
AMD_EVENT_INTMASK = (AMD_PEER_FLUSH_EVENT |
AMD_PEER_RESET_EVENT | AMD_PEER_D3_EVENT |
AMD_PEER_PMETO_EVENT | AMD_PEER_D0_EVENT),
AMD_PMESTAT_OFFSET = 0x480,
AMD_PMSGTRIG_OFFSET = 0x490,
AMD_LTRLATENCY_OFFSET = 0x494,
AMD_FLUSHTRIG_OFFSET = 0x498,
/* SMU register*/
AMD_SMUACK_OFFSET = 0x4A0,
AMD_SINRST_OFFSET = 0x4A4,
AMD_RSPNUM_OFFSET = 0x4A8,
AMD_SMU_SPADMUTEX = 0x4B0,
AMD_SMU_SPADOFFSET = 0x4B4,
AMD_PEER_OFFSET = 0x400,
};
struct amd_ntb_dev;
struct amd_ntb_vec {
struct amd_ntb_dev *ndev;
int num;
};
struct amd_ntb_dev {
struct ntb_dev ntb;
u32 ntb_side;
u32 lnk_sta;
u32 cntl_sta;
u32 peer_sta;
unsigned char mw_count;
unsigned char spad_count;
unsigned char db_count;
unsigned char msix_vec_count;
u64 db_valid_mask;
u64 db_mask;
u32 int_mask;
struct msix_entry *msix;
struct amd_ntb_vec *vec;
/* synchronize rmw access of db_mask and hw reg */
spinlock_t db_mask_lock;
void __iomem *self_mmio;
void __iomem *peer_mmio;
unsigned int self_spad;
unsigned int peer_spad;
struct delayed_work hb_timer;
struct dentry *debugfs_dir;
struct dentry *debugfs_info;
};
#define ndev_pdev(ndev) ((ndev)->ntb.pdev)
#define ndev_name(ndev) pci_name(ndev_pdev(ndev))
#define ndev_dev(ndev) (&ndev_pdev(ndev)->dev)
#define ntb_ndev(__ntb) container_of(__ntb, struct amd_ntb_dev, ntb)
#define hb_ndev(__work) container_of(__work, struct amd_ntb_dev, hb_timer.work)
#endif