Re: [PATCH v4 1/4] s390x/css: Introduce an ESW struct

[Cornelia Huck <cohuck@redhat.com>]

On Fri, Jun 18 2021, Cornelia Huck <cohuck@redhat.com> wrote:

> On Fri, Jun 18 2021, Eric Farman <farman@linux.ibm.com> wrote:
>
>> The Interrupt Response Block is comprised of several other
>> structures concatenated together, but only the 12-byte
>> Subchannel-Status Word (SCSW) is defined as a proper struct.
>> Everything else is a simple array of 32-bit words.
>>
>> Let's define a proper struct for the 20-byte Extended-Status
>> Word (ESW) so that we can make good decisions about the sense
>> data that would go into the ECW area for virtual vs
>> passthrough devices.
>>
>> Signed-off-by: Eric Farman <farman@linux.ibm.com>
>> ---
>>  hw/s390x/css.c            | 19 +++++++++++++------
>>  include/hw/s390x/ioinst.h | 12 +++++++++++-
>>  2 files changed, 24 insertions(+), 7 deletions(-)
>>
>> diff --git a/include/hw/s390x/ioinst.h b/include/hw/s390x/ioinst.h
>> index c6737a30d4..e7ab401781 100644
>> --- a/include/hw/s390x/ioinst.h
>> +++ b/include/hw/s390x/ioinst.h
>> @@ -123,10 +123,20 @@ typedef struct SCHIB {
>>      uint8_t mda[4];
>>  } QEMU_PACKED SCHIB;
>>  
>> +/* format-0 extended-status word */
>> +typedef struct ESW {
>> +   uint32_t word0;
>> +   uint32_t erw;
>> +   uint64_t f_addr;     /* Zeros for other ESW formats */
>> +   uint32_t s_addr;     /* Zeros for other ESW formats */
>> +} QEMU_PACKED ESW;
>
> Eww, this fails with mingw:
> https://gitlab.com/cohuck/qemu/-/jobs/1358335494
>
> i686-w64-mingw32-gcc -Ilibcommon.fa.p -I../slirp -I../slirp/src -I../dtc/libfdt -I../capstone/include/capstone -I. -Iqapi -Itrace -Iui -Iui/shader -I/usr/i686-w64-mingw32/sys-root/mingw/include -I/usr/i686-w64-mingw32/sys-root/mingw/include/glib-2.0 -I/usr/i686-w64-mingw32/sys-root/mingw/lib/glib-2.0/include -I/usr/i686-w64-mingw32/sys-root/mingw/include/gtk-3.0 -I/usr/i686-w64-mingw32/sys-root/mingw/include/cairo -I/usr/i686-w64-mingw32/sys-root/mingw/include/pango-1.0 -I/usr/i686-w64-mingw32/sys-root/mingw/include/fribidi -I/usr/i686-w64-mingw32/sys-root/mingw/include/harfbuzz -I/usr/i686-w64-mingw32/sys-root/mingw/include/atk-1.0 -I/usr/i686-w64-mingw32/sys-root/mingw/include/pixman-1 -I/usr/i686-w64-mingw32/sys-root/mingw/include/freetype2 -I/usr/i686-w64-mingw32/sys-root/mingw/include/libpng16 -I/usr/i686-w64-mingw32/sys-root/mingw/include/gdk-pixbuf-2.0 -I/usr/i686-w64-mingw32/sys-root/mingw/lib/libffi-3.1/include -I/usr/i686-w64-mingw32/sys-root/mingw/include/p11-kit-1 -I/usr/i686-w64-mingw32/sys-root/mingw/include/SDL2 -fdiagnostics-color=auto -pipe -Wall -Winvalid-pch -Werror -std=gnu99 -O2 -g -iquote . -iquote /builds/cohuck/qemu -iquote /builds/cohuck/qemu/include -iquote /builds/cohuck/qemu/disas/libvixl -iquote /builds/cohuck/qemu/tcg/i386 -mms-bitfields -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -m32 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv -Wold-style-declaration -Wold-style-definition -Wtype-limits -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wempty-body -Wnested-externs -Wendif-labels -Wexpansion-to-defined -Wimplicit-fallthrough=2 -Wno-missing-include-dirs -Wno-shift-negative-value -Wno-psabi -fstack-protector-strong -Dmain=SDL_main -Wno-undef -mms-bitfields -mms-bitfields -mms-bitfields -MD -MQ libcommon.fa.p/hw_s390x_virtio-ccw-gpu.c.obj -MF libcommon.fa.p/hw_s390x_virtio-ccw-gpu.c.obj.d -o libcommon.fa.p/hw_s390x_virtio-ccw-gpu.c.obj -c ../hw/s390x/virtio-ccw-gpu.c
> In file included from /usr/i686-w64-mingw32/sys-root/mingw/include/winsock2.h:54,
>                  from /builds/cohuck/qemu/include/sysemu/os-win32.h:29,
>                  from /builds/cohuck/qemu/include/qemu/osdep.h:135,
>                  from ../hw/s390x/virtio-ccw-gpu.c:11:
> /builds/cohuck/qemu/include/hw/s390x/ioinst.h:131:13: error: expected ':', ',', ';', '}' or '__attribute__' before '.' token
>   131 |    uint32_t s_addr;     /* Zeros for other ESW formats */
>       |             ^~~~~~

It seems to be the name that is tripping it; if I rename it to sec_addr
and the preceding field to fail_addr, the build passes.

Anyone know why that is? And if renaming is unavoidable, are fail_addr
and sec_addr ok, or can we find better names?

> In file included from /builds/cohuck/qemu/include/qemu/osdep.h:37,
>                  from ../hw/s390x/virtio-ccw-gpu.c:11:
> /builds/cohuck/qemu/include/qemu/compiler.h:80:36: error: static assertion failed: "size of IRB is wrong"
>    80 | #define QEMU_BUILD_BUG_MSG(x, msg) _Static_assert(!(x), msg)
>       |                                    ^~~~~~~~~~~~~~
> /builds/cohuck/qemu/include/hw/s390x/ioinst.h:143:1: note: in expansion of macro 'QEMU_BUILD_BUG_MSG'
>   143 | QEMU_BUILD_BUG_MSG(sizeof(IRB) != 96, "size of IRB is wrong");
>       | ^~~~~~~~~~~~~~~~~~
>

These were just follow-on errors.

>> +
>> +#define ESW_ERW_SENSE 0x01000000
>> +
>>  /* interruption response block */
>>  typedef struct IRB {
>>      SCSW scsw;
>> -    uint32_t esw[5];
>> +    ESW esw;
>>      uint32_t ecw[8];
>>      uint32_t emw[8];
>>  } IRB;