linux-kernel - Re: [PATCH v11 01/14] s390/vfio-ap: No need to disable IRQ after queue reset

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Date:   Mon, 26 Oct 2020 12:57:12 -0400
From:   Tony Krowiak <akrowiak@...ux.ibm.com>
To:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, freude@...ux.ibm.com,
        borntraeger@...ibm.com, cohuck@...hat.com, mjrosato@...ux.ibm.com,
        pasic@...ux.ibm.com, alex.williamson@...hat.com,
        kwankhede@...dia.com
Subject: Re: [PATCH v11 01/14] s390/vfio-ap: No need to disable IRQ after
 queue reset



On 10/22/20 3:44 PM, kernel test robot wrote:
> Hi Tony,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on s390/features]
> [also build test WARNING on linus/master kvms390/next linux/master v5.9 next-20201022]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
>
> url:    https://github.com/0day-ci/linux/commits/Tony-Krowiak/s390-vfio-ap-dynamic-configuration-support/20201023-011543
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features
> config: s390-allyesconfig (attached as .config)
> compiler: s390-linux-gcc (GCC) 9.3.0
> reproduce (this is a W=1 build):
>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>          chmod +x ~/bin/make.cross
>          # https://github.com/0day-ci/linux/commit/572c94c40a76754d49f07e4e383097d2db132f8c
>          git remote add linux-review https://github.com/0day-ci/linux
>          git fetch --no-tags linux-review Tony-Krowiak/s390-vfio-ap-dynamic-configuration-support/20201023-011543
>          git checkout 572c94c40a76754d49f07e4e383097d2db132f8c
>          # save the attached .config to linux build tree
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
>>> drivers/s390/crypto/vfio_ap_ops.c:1119:5: warning: no previous prototype for 'vfio_ap_mdev_reset_queue' [-Wmissing-prototypes]
>      1119 | int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi,
>           |     ^~~~~~~~~~~~~~~~~~~~~~~~

This function needs to be made static because it is no longer defined in 
the header file.

>
> vim +/vfio_ap_mdev_reset_queue +1119 drivers/s390/crypto/vfio_ap_ops.c
>
> 258287c994de8f Tony Krowiak 2018-09-25  1118
> ec89b55e3bce7c Pierre Morel 2019-05-21 @1119  int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi,
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1120  			     unsigned int retry)
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1121  {
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1122  	struct ap_queue_status status;
> ec89b55e3bce7c Pierre Morel 2019-05-21  1123  	int retry2 = 2;
> ec89b55e3bce7c Pierre Morel 2019-05-21  1124  	int apqn = AP_MKQID(apid, apqi);
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1125
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1126  	do {
> ec89b55e3bce7c Pierre Morel 2019-05-21  1127  		status = ap_zapq(apqn);
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1128  		switch (status.response_code) {
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1129  		case AP_RESPONSE_NORMAL:
> ec89b55e3bce7c Pierre Morel 2019-05-21  1130  			while (!status.queue_empty && retry2--) {
> ec89b55e3bce7c Pierre Morel 2019-05-21  1131  				msleep(20);
> ec89b55e3bce7c Pierre Morel 2019-05-21  1132  				status = ap_tapq(apqn, NULL);
> ec89b55e3bce7c Pierre Morel 2019-05-21  1133  			}
> 024cdcdbf3cf99 Halil Pasic  2019-09-03  1134  			WARN_ON_ONCE(retry2 <= 0);
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1135  			return 0;
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1136  		case AP_RESPONSE_RESET_IN_PROGRESS:
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1137  		case AP_RESPONSE_BUSY:
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1138  			msleep(20);
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1139  			break;
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1140  		default:
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1141  			/* things are really broken, give up */
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1142  			return -EIO;
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1143  		}
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1144  	} while (retry--);
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1145
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1146  	return -EBUSY;
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1147  }
> 46a7263d4746a2 Tony Krowiak 2018-09-25  1148
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org