linux-kernel - RE: [PATCH v2] scsi: ufs: mcq: Limit the amount of inflight requests

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Message-ID: <DM6PR04MB65751D81F92C86E81C1AEE57FC639@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Thu, 20 Apr 2023 09:59:56 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Dan Carpenter <error27@...il.com>,
        "oe-kbuild@...ts.linux.dev" <oe-kbuild@...ts.linux.dev>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>
CC:     "lkp@...el.com" <lkp@...el.com>,
        "oe-kbuild-all@...ts.linux.dev" <oe-kbuild-all@...ts.linux.dev>,
        Asutosh Das <quic_asutoshd@...cinc.com>,
        "quic_cang@...cinc.com" <quic_cang@...cinc.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Johannes Thumshirn <Johannes.Thumshirn@....com>,
        Bart Van Assche <bvanassche@....org>
Subject: RE: [PATCH v2] scsi: ufs: mcq: Limit the amount of inflight requests

> Hi Avri,
> 
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Avri-Altman/scsi-ufs-
> mcq-Limit-the-amount-of-inflight-requests/20230331-155149
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next
> patch link:    https://lore.kernel.org/r/20230331074650.75-1-
> avri.altman%40wdc.com
> patch subject: [PATCH v2] scsi: ufs: mcq: Limit the amount of inflight requests
> config: parisc-randconfig-m031-20230329 (https://download.01.org/0day-
> ci/archive/20230401/202304011340.ltlHYazS-lkp@...el.com/config)
> compiler: hppa-linux-gcc (GCC) 12.1.0
> 
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
> | Reported-by: Dan Carpenter <error27@...il.com>
> | Link: https://lore.kernel.org/r/202304011340.ltlHYazS-lkp@intel.com/
> 
> New smatch warnings:
> drivers/ufs/core/ufshcd.c:8473 ufshcd_alloc_mcq() warn: missing error code
> 'ret'
> 
> Old smatch warnings:
> drivers/ufs/core/ufshcd.c:5412 ufshcd_uic_cmd_compl() error: we previously
> assumed 'hba->active_uic_cmd' could be null (see line 5400)
> drivers/ufs/core/ufshcd.c:2350 ufshcd_hba_capabilities() warn: missing error
> code? 'err'
> 
> vim +/ret +8473 drivers/ufs/core/ufshcd.c
> 
> 57b1c0ef89ac9d drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8457
> static int ufshcd_alloc_mcq(struct ufs_hba *hba)
> 57b1c0ef89ac9d drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8458  {
> 7224c806876e46 drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8459
> int ret;
> 7224c806876e46 drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8460
> int old_nutrs = hba->nutrs;
> 7224c806876e46 drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8461
> 7224c806876e46 drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8462
> ret = ufshcd_mcq_decide_queue_depth(hba);
> 7224c806876e46 drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8463
> if (ret < 0)
> 7224c806876e46 drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8464
> return ret;
> 7224c806876e46 drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8465
> 7224c806876e46 drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8466
> hba->nutrs = ret;
> 7224c806876e46 drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8467
> ret = ufshcd_mcq_init(hba);
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8468
> if (ret)
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8469
> goto err;
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8470
> 2580a95e61d461 drivers/ufs/core/ufshcd.c Avri Altman   2023-03-31  8471
> if (hba->nutrs * hba->nr_hw_queues > SZ_64K - 1) {
> 2580a95e61d461 drivers/ufs/core/ufshcd.c Avri Altman   2023-03-31  8472
> dev_info(hba->dev, "there can be at most 64K inflight requests\n");
> 2580a95e61d461 drivers/ufs/core/ufshcd.c Avri Altman   2023-03-31 @8473
> goto err;
> 
> ret = -EINVAL;
Thanks.

Avri

> 
> 2580a95e61d461 drivers/ufs/core/ufshcd.c Avri Altman   2023-03-31  8474
> }
> 2580a95e61d461 drivers/ufs/core/ufshcd.c Avri Altman   2023-03-31  8475
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8476
> /*
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8477
> * Previously allocated memory for nutrs may not be enough in MCQ mode.
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8478
> * Number of supported tags in MCQ mode may be larger than SDB mode.
> 6ccf44fe4cd7c4 drivers/scsi/ufs/ufshcd.c Seungwon Jeon 2013-06-26  8479
> */
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8480
> if (hba->nutrs != old_nutrs) {
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8481
> ufshcd_release_sdb_queue(hba, old_nutrs);
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8482
> ret = ufshcd_memory_alloc(hba);
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8483
> if (ret)
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8484
> goto err;
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8485
> ufshcd_host_memory_configure(hba);
> 7224c806876e46 drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8486
> }
> 7224c806876e46 drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8487
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8488
> ret = ufshcd_mcq_memory_alloc(hba);
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8489
> if (ret)
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8490
> goto err;
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8491
> 7224c806876e46 drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8492
> return 0;
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8493
> err:
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8494
> hba->nutrs = old_nutrs;
> 4682abfae2eb3a drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8495
> return ret;
> 57b1c0ef89ac9d drivers/ufs/core/ufshcd.c Asutosh Das   2023-01-13  8496  }
> 
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests