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Date:   Fri, 23 Dec 2016 15:24:38 +0800
From:   Ming Lei <tom.leiming@...il.com>
To:     "zhichang.yuan" <yuanzhichang@...ilicon.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxarm@...wei.com,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        linux-serial@...r.kernel.org, Corey Minyard <minyard@....org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Liviu Dudau <liviu.dudau@....com>,
        Zou Rongrong <zourongrong@...il.com>, john.garry@...wei.com,
        gabriele.paoloni@...wei.com, zhichang.yuan02@...il.com,
        kantyzc@....com, xuwei5@...ilicon.com
Subject: Re: [PATCH V5 1/3] ARM64 LPC: Indirect ISA port IO introduced

On Fri, Dec 23, 2016 at 9:43 AM, zhichang.yuan
<yuanzhichang@...ilicon.com> wrote:
> Hi´╝îMing,
>
>
> On 2016/12/22 16:15, Ming Lei wrote:
>> Hi Guys,
>>
>> On Tue, Nov 8, 2016 at 11:47 AM, zhichang.yuan
>> <yuanzhichang@...ilicon.com> wrote:
>>> For arm64, there is no I/O space as other architectural platforms, such as
>>> X86. Most I/O accesses are achieved based on MMIO. But for some arm64 SoCs,
>>> such as Hip06, when accessing some legacy ISA devices connected to LPC, those
>>> known port addresses are used to control the corresponding target devices, for
>>> example, 0x2f8 is for UART, 0xe4 is for ipmi-bt. It is different from the
>>> normal MMIO mode in using.
>>>
>>> To drive these devices, this patch introduces a method named indirect-IO.
>>> In this method the in/out pair in arch/arm64/include/asm/io.h will be
>>> redefined. When upper layer drivers call in/out with those known legacy port
>>> addresses to access the peripherals, the hooking functions corrresponding to
>>> those target peripherals will be called. Through this way, those upper layer
>>> drivers which depend on in/out can run on Hip06 without any changes.
>>>
>>> Cc: Catalin Marinas <catalin.marinas@....com>
>>> Cc: Will Deacon <will.deacon@....com>
>>> Signed-off-by: zhichang.yuan <yuanzhichang@...ilicon.com>
>>> Signed-off-by: Gabriele Paoloni <gabriele.paoloni@...wei.com>
>>> ---
>>>  arch/arm64/Kconfig             |  6 +++
>>>  arch/arm64/include/asm/extio.h | 94 ++++++++++++++++++++++++++++++++++++++++++
>>>  arch/arm64/include/asm/io.h    | 29 +++++++++++++
>>>  arch/arm64/kernel/Makefile     |  1 +
>>>  arch/arm64/kernel/extio.c      | 27 ++++++++++++
>>>  5 files changed, 157 insertions(+)
>>
>> When I applied these three patches against current linus tree and
>> enable CONFIG_HISILICON_LPC, the following build failure[1] is
>> triggered when running 'make modules'.
>>
>
> Thanks for your report!
>
> This patch has compilation issue on some architectures, sorry for the inconvenience caused by this!
> The ongoing v6 will solve these issues.
> I will trace this failure and provide a fix if you can not wait for the next version.
>
> Could you send me your .config in private? I don't want to bother all the hacker in the mail-list.
>

Sure, please see the config in attachment.

>
> Thanks,
> Zhichang
>
>>
>> Thanks,
>> Ming
>>
>> [1] 'make modules' failure log
>>
>>   Building modules, stage 2.
>>   MODPOST 2260 modules
>> ERROR: "inb" [drivers/watchdog/wdt_pci.ko] undefined!
>> ERROR: "outb" [drivers/watchdog/wdt_pci.ko] undefined!
>> ERROR: "outb" [drivers/watchdog/pcwd_pci.ko] undefined!
>> ERROR: "inb" [drivers/watchdog/pcwd_pci.ko] undefined!
>> ERROR: "outw" [drivers/video/vgastate.ko] undefined!
>> ERROR: "outb" [drivers/video/vgastate.ko] undefined!
>> ERROR: "inb" [drivers/video/vgastate.ko] undefined!
>> ERROR: "outw" [drivers/video/fbdev/vt8623fb.ko] undefined!
>> ERROR: "inb" [drivers/video/fbdev/vt8623fb.ko] undefined!
>> ERROR: "outb" [drivers/video/fbdev/vt8623fb.ko] undefined!
>> ERROR: "outw" [drivers/video/fbdev/tridentfb.ko] undefined!
>> ERROR: "inb" [drivers/video/fbdev/tridentfb.ko] undefined!
>> ERROR: "outb" [drivers/video/fbdev/tridentfb.ko] undefined!
>> ERROR: "inb" [drivers/video/fbdev/tdfxfb.ko] undefined!
>> .....
>> ERROR: "inb" [drivers/ata/pata_cmd64x.ko] undefined!
>> ERROR: "inb" [drivers/ata/pata_artop.ko] undefined!
>> scripts/Makefile.modpost:91: recipe for target '__modpost' failed
>> make[1]: *** [__modpost] Error 1
>> Makefile:1196: recipe for target 'modules' failed
>> make: *** [modules] Error 2
>>
>>
>>>  create mode 100644 arch/arm64/include/asm/extio.h
>>>  create mode 100644 arch/arm64/kernel/extio.c
>>>
>>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>>> index 969ef88..b44070b 100644
>>> --- a/arch/arm64/Kconfig
>>> +++ b/arch/arm64/Kconfig
>>> @@ -163,6 +163,12 @@ config ARCH_MMAP_RND_COMPAT_BITS_MIN
>>>  config ARCH_MMAP_RND_COMPAT_BITS_MAX
>>>         default 16
>>>
>>> +config ARM64_INDIRECT_PIO
>>> +       bool "access peripherals with legacy I/O port"
>>> +       help
>>> +         Support special accessors for ISA I/O devices. This is needed for
>>> +         SoCs that do not support standard read/write for the ISA range.
>>> +
>>>  config NO_IOPORT_MAP
>>>         def_bool y if !PCI
>>>
>>> diff --git a/arch/arm64/include/asm/extio.h b/arch/arm64/include/asm/extio.h
>>> new file mode 100644
>>> index 0000000..6ae0787
>>> --- /dev/null
>>> +++ b/arch/arm64/include/asm/extio.h
>>> @@ -0,0 +1,94 @@
>>> +/*
>>> + * Copyright (C) 2016 Hisilicon Limited, All Rights Reserved.
>>> + * Author: Zhichang Yuan <yuanzhichang@...ilicon.com>
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU General Public License version 2 as
>>> + * published by the Free Software Foundation.
>>> + *
>>> + * This program is distributed in the hope that it will be useful,
>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>> + * GNU General Public License for more details.
>>> + *
>>> + * You should have received a copy of the GNU General Public License
>>> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
>>> + */
>>> +
>>> +#ifndef __LINUX_EXTIO_H
>>> +#define __LINUX_EXTIO_H
>>> +
>>> +struct extio_ops {
>>> +       unsigned long start;/* inclusive, sys io addr */
>>> +       unsigned long end;/* inclusive, sys io addr */
>>> +
>>> +       u64 (*pfin)(void *devobj, unsigned long ptaddr, size_t dlen);
>>> +       void (*pfout)(void *devobj, unsigned long ptaddr, u32 outval,
>>> +                                       size_t dlen);
>>> +       u64 (*pfins)(void *devobj, unsigned long ptaddr, void *inbuf,
>>> +                               size_t dlen, unsigned int count);
>>> +       void (*pfouts)(void *devobj, unsigned long ptaddr,
>>> +                               const void *outbuf, size_t dlen,
>>> +                               unsigned int count);
>>> +       void *devpara;
>>> +};
>>> +
>>> +extern struct extio_ops *arm64_extio_ops;
>>> +
>>> +#define DECLARE_EXTIO(bw, type)                                                \
>>> +extern type in##bw(unsigned long addr);                                        \
>>> +extern void out##bw(type value, unsigned long addr);                   \
>>> +extern void ins##bw(unsigned long addr, void *buffer, unsigned int count);\
>>> +extern void outs##bw(unsigned long addr, const void *buffer, unsigned int count);
>>> +
>>> +#define BUILD_EXTIO(bw, type)                                          \
>>> +type in##bw(unsigned long addr)                                                \
>>> +{                                                                      \
>>> +       if (!arm64_extio_ops || arm64_extio_ops->start > addr ||        \
>>> +                       arm64_extio_ops->end < addr)                    \
>>> +               return read##bw(PCI_IOBASE + addr);                     \
>>> +       return arm64_extio_ops->pfin ?                                  \
>>> +               arm64_extio_ops->pfin(arm64_extio_ops->devpara,         \
>>> +                       addr, sizeof(type)) : -1;                       \
>>> +}                                                                      \
>>> +                                                                       \
>>> +void out##bw(type value, unsigned long addr)                           \
>>> +{                                                                      \
>>> +       if (!arm64_extio_ops || arm64_extio_ops->start > addr ||        \
>>> +                       arm64_extio_ops->end < addr)                    \
>>> +               write##bw(value, PCI_IOBASE + addr);                    \
>>> +       else                                                            \
>>> +               if (arm64_extio_ops->pfout)                             \
>>> +                       arm64_extio_ops->pfout(arm64_extio_ops->devpara,\
>>> +                               addr, value, sizeof(type));             \
>>> +}                                                                      \
>>> +                                                                       \
>>> +void ins##bw(unsigned long addr, void *buffer, unsigned int count)     \
>>> +{                                                                      \
>>> +       if (!arm64_extio_ops || arm64_extio_ops->start > addr ||        \
>>> +                       arm64_extio_ops->end < addr)                    \
>>> +               reads##bw(PCI_IOBASE + addr, buffer, count);            \
>>> +       else                                                            \
>>> +               if (arm64_extio_ops->pfins)                             \
>>> +                       arm64_extio_ops->pfins(arm64_extio_ops->devpara,\
>>> +                               addr, buffer, sizeof(type), count);     \
>>> +}                                                                      \
>>> +                                                                       \
>>> +void outs##bw(unsigned long addr, const void *buffer, unsigned int count)      \
>>> +{                                                                      \
>>> +       if (!arm64_extio_ops || arm64_extio_ops->start > addr ||        \
>>> +                       arm64_extio_ops->end < addr)                    \
>>> +               writes##bw(PCI_IOBASE + addr, buffer, count);           \
>>> +       else                                                            \
>>> +               if (arm64_extio_ops->pfouts)                            \
>>> +                       arm64_extio_ops->pfouts(arm64_extio_ops->devpara,\
>>> +                               addr, buffer, sizeof(type), count);     \
>>> +}
>>> +
>>> +static inline void arm64_set_extops(struct extio_ops *ops)
>>> +{
>>> +       if (ops)
>>> +               WRITE_ONCE(arm64_extio_ops, ops);
>>> +}
>>> +
>>> +#endif /* __LINUX_EXTIO_H*/
>>> diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
>>> index 0bba427..136735d 100644
>>> --- a/arch/arm64/include/asm/io.h
>>> +++ b/arch/arm64/include/asm/io.h
>>> @@ -31,6 +31,7 @@
>>>  #include <asm/early_ioremap.h>
>>>  #include <asm/alternative.h>
>>>  #include <asm/cpufeature.h>
>>> +#include <asm/extio.h>
>>>
>>>  #include <xen/xen.h>
>>>
>>> @@ -149,6 +150,34 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
>>>  #define IO_SPACE_LIMIT         (PCI_IO_SIZE - 1)
>>>  #define PCI_IOBASE             ((void __iomem *)PCI_IO_START)
>>>
>>> +
>>> +/*
>>> + * redefine the in(s)b/out(s)b for indirect-IO.
>>> + */
>>> +#ifdef CONFIG_ARM64_INDIRECT_PIO
>>> +#define inb inb
>>> +#define outb outb
>>> +#define insb insb
>>> +#define outsb outsb
>>> +/* external declaration */
>>> +DECLARE_EXTIO(b, u8)
>>> +
>>> +#define inw inw
>>> +#define outw outw
>>> +#define insw insw
>>> +#define outsw outsw
>>> +
>>> +DECLARE_EXTIO(w, u16)
>>> +
>>> +#define inl inl
>>> +#define outl outl
>>> +#define insl insl
>>> +#define outsl outsl
>>> +
>>> +DECLARE_EXTIO(l, u32)
>>> +#endif
>>> +
>>> +
>>>  /*
>>>   * String version of I/O memory access operations.
>>>   */
>>> diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
>>> index 7d66bba..60e0482 100644
>>> --- a/arch/arm64/kernel/Makefile
>>> +++ b/arch/arm64/kernel/Makefile
>>> @@ -31,6 +31,7 @@ arm64-obj-$(CONFIG_COMPAT)            += sys32.o kuser32.o signal32.o         \
>>>                                            sys_compat.o entry32.o
>>>  arm64-obj-$(CONFIG_FUNCTION_TRACER)    += ftrace.o entry-ftrace.o
>>>  arm64-obj-$(CONFIG_MODULES)            += arm64ksyms.o module.o
>>> +arm64-obj-$(CONFIG_ARM64_INDIRECT_PIO) += extio.o
>>>  arm64-obj-$(CONFIG_ARM64_MODULE_PLTS)  += module-plts.o
>>>  arm64-obj-$(CONFIG_PERF_EVENTS)                += perf_regs.o perf_callchain.o
>>>  arm64-obj-$(CONFIG_HW_PERF_EVENTS)     += perf_event.o
>>> diff --git a/arch/arm64/kernel/extio.c b/arch/arm64/kernel/extio.c
>>> new file mode 100644
>>> index 0000000..647b3fa
>>> --- /dev/null
>>> +++ b/arch/arm64/kernel/extio.c
>>> @@ -0,0 +1,27 @@
>>> +/*
>>> + * Copyright (C) 2016 Hisilicon Limited, All Rights Reserved.
>>> + * Author: Zhichang Yuan <yuanzhichang@...ilicon.com>
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU General Public License version 2 as
>>> + * published by the Free Software Foundation.
>>> + *
>>> + * This program is distributed in the hope that it will be useful,
>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>> + * GNU General Public License for more details.
>>> + *
>>> + * You should have received a copy of the GNU General Public License
>>> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
>>> + */
>>> +
>>> +#include <linux/io.h>
>>> +
>>> +struct extio_ops *arm64_extio_ops;
>>> +
>>> +
>>> +BUILD_EXTIO(b, u8)
>>> +
>>> +BUILD_EXTIO(w, u16)
>>> +
>>> +BUILD_EXTIO(l, u32)
>>> --
>>> 1.9.1
>>>
>>
>>
>>
>



Thanks,
Ming Lei

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