Re: [PATCH V5 1/3] ARM64 LPC: Indirect ISA port IO introduced

["zhichang.yuan" <yuanzhichang@hisilicon.com>]

Hi，Ming,


On 2016/12/22 16:15, Ming Lei wrote:
> Hi Guys,
> 
> On Tue, Nov 8, 2016 at 11:47 AM, zhichang.yuan
> <yuanzhichang@hisilicon.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@arm.com>
>> Cc: Will Deacon <will.deacon@arm.com>
>> Signed-off-by: zhichang.yuan <yuanzhichang@hisilicon.com>
>> Signed-off-by: Gabriele Paoloni <gabriele.paoloni@huawei.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.


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@hisilicon.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@hisilicon.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
>>
> 
> 
>