linux-kernel - [PATCH v2 3/3] scsi: smartpqi: fix DMA overlapping mappings asymmetry

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Message-Id: <20230316140912.1038404-4-desnesn@redhat.com>
Date:   Thu, 16 Mar 2023 11:09:12 -0300
From:   Desnes Nunes <desnesn@...hat.com>
To:     iommu@...ts.linux.dev, linux-scsi@...r.kernel.org,
        storagedev@...rochip.com, linux-kernel@...r.kernel.org
Cc:     hch@....de, martin.petersen@...cle.com, don.brace@...rochip.com,
        m.szyprowski@...sung.com, robin.murphy@....com, jejb@...ux.ibm.com,
        jsnitsel@...hat.com, Desnes Nunes <desnesn@...hat.com>
Subject: [PATCH v2 3/3] scsi: smartpqi: fix DMA overlapping mappings asymmetry

Currently, pqi_keep_device_offline() calls pqi_build_raid_path_request()
(i.e., a wrapper to pqi_map_single()), but there isn't a pqi_pci_unmap()
call in pqi_keep_device_offline(). Hence, this is flaged as an API viola-
tion due to the overlapping mapping of the physical address.

This patch fixes following warning:

  DMA-API: smartpqi 0000:43:00.0: cacheline tracking EEXIST, overlapping
  mappings aren't supported
  WARNING: CPU: 0 PID: 15 at kernel/dma/debug.c:570
  add_dma_entry+0x1f6/0x2f0
  CPU: 0 PID: 15 Comm: kworker/0:1 Not tainted 6.3.0-rc1-linux #1
  Call Trace:
   <TASK>
   dma_map_page_attrs+0x6f/0xa0
   pqi_map_single+0xaa/0x160 [smartpqi]
   pqi_keep_device_offline+0xaf/0x160 [smartpqi]
   ? dma_unmap_page_attrs+0x1a1/0x1e0
   ? pqi_identify_physical_device.constprop.0+0xd3/0xe0 [smartpqi]
   pqi_update_scsi_devices+0x284/0x7e0 [smartpqi]
   pqi_scan_scsi_devices+0x87/0xe0 [smartpqi]
   pqi_ctrl_init+0x725/0xa60 [smartpqi]
   pqi_pci_probe+0xa7/0x130 [smartpqi]
   local_pci_probe+0x46/0xa0
   work_for_cpu_fn+0x16/0x20
   process_one_work+0x2bf/0x670
   ? __pfx_worker_thread+0x10/0x10
   worker_thread+0x1d1/0x3b0
   ? __pfx_worker_thread+0x10/0x10
   kthread+0xf3/0x120
   ? __pfx_kthread+0x10/0x10
   ret_from_fork+0x2c/0x50
   </TASK>

Fixes: be76f90668d8 ("scsi: smartpqi: Add TEST UNIT READY check for SANITIZE operation")
Signed-off-by: Desnes Nunes <desnesn@...hat.com>
---
 drivers/scsi/smartpqi/smartpqi_init.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 49a8f91810b6..6fca497ca605 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -1726,6 +1726,8 @@ static bool pqi_keep_device_offline(struct pqi_ctrl_info *ctrl_info,

 	rc = pqi_submit_raid_request_synchronous(ctrl_info, &request.header, 0, &error_info);

+	pqi_pci_unmap(ctrl_info->pci_dev, request.sg_descriptors, 1, dir);
+
 	if (rc)
 		goto out; /* Assume not offline */

-- 
2.39.1