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Date: Mon, 17 Mar 2014 12:52:02 -0400 From: Josh Boyer <jwboyer@...oraproject.org> To: Arvind Kumar <arvindkumar@...are.com>, VMware PV-Drivers <pv-drivers@...are.com> Cc: "James E.J. Bottomley" <JBottomley@...allels.com>, "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>, "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org> Subject: DMA-API mapping errors in vmw_pvscsi Hi All, We've had a few reports[1][2] now on the vmw_pvscsi driver throwing DMA-API mapping errors when the DMA_API_DEBUG option is enabled. I've included one from a recent 3.14-rc6 kernel below. Looking at vmw_pvscsi.c, I can see pvscsi_map_buffers is missing the calls to pci_dma_mapping_error, which is what causes the warnings to be thrown. However, I'm not familiar with this driver and I can't see what the proper error path should be in this case. pvscsi_map_buffers is a void function and doesn't currently have the ability to return an error to the caller. Even if it did, I'm not sure what the proper response to an error should be. Thoughts? josh [ 2.962772] ------------[ cut here ]------------ [ 2.963764] WARNING: CPU: 1 PID: 6 at lib/dma-debug.c:1140 check_unmap+0x4ee/0x9e0() [ 2.965382] vmw_pvscsi 0000:03:00.0: DMA-API: device driver failed to check map error[device address=0x0000000078520f80] [size=96 bytes] [mapped as single] [ 2.968214] Modules linked in: [ 2.968897] vmwgfx(+) ttm drm ata_generic vmw_pvscsi(+) i2c_core pata_acpi [ 2.970302] CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 3.14.0-0.rc6.git4.1.fc21.x86_64 #1 [ 2.972028] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/30/2013 [ 2.974230] Workqueue: events_unbound async_run_entry_fn [ 2.975375] 0000000000000000 000000003e328dbc ffff88007fc03bf0 ffffffff817d19a8 [ 2.977032] ffff88007fc03c38 ffff88007fc03c28 ffffffff8109671d ffff88007bf63540 [ 2.978694] ffff88007bc52e50 ffffffff82d74a90 0000000000000082 ffffffff81a2cce8 [ 2.980352] Call Trace: [ 2.980882] <IRQ> [<ffffffff817d19a8>] dump_stack+0x4d/0x66 [ 2.982147] [<ffffffff8109671d>] warn_slowpath_common+0x7d/0xa0 [ 2.983398] [<ffffffff8109679c>] warn_slowpath_fmt+0x5c/0x80 [ 2.984606] [<ffffffff813f5bfe>] check_unmap+0x4ee/0x9e0 [ 2.985731] [<ffffffff813f6160>] debug_dma_unmap_page+0x70/0x90 [ 2.986981] [<ffffffffa00196e3>] pvscsi_unmap_buffers.isra.12+0x123/0x200 [vmw_pvscsi] [ 2.988635] [<ffffffffa00198c6>] pvscsi_process_completion_ring+0x106/0x2f0 [vmw_pvscsi] [ 2.990325] [<ffffffffa0019b64>] pvscsi_isr+0x34/0xa0 [vmw_pvscsi] [ 2.991631] [<ffffffff8110e26e>] handle_irq_event_percpu+0x3e/0x370 [ 2.992952] [<ffffffff8110e5dd>] handle_irq_event+0x3d/0x60 [ 2.994129] [<ffffffff811112c7>] handle_edge_irq+0x77/0x130 [ 2.995320] [<ffffffff8101dd6f>] handle_irq+0xbf/0x150 [ 2.996413] [<ffffffff8109da62>] ? irq_enter+0x42/0x90 [ 2.997514] [<ffffffff817e7b0f>] do_IRQ+0x4f/0xf0 [ 2.998521] [<ffffffff817db8f2>] common_interrupt+0x72/0x72 [ 2.999703] <EOI> [<ffffffff817dabab>] ? _raw_spin_unlock_irqrestore+0x3b/0x70 [ 3.001587] [<ffffffffa001a7c0>] pvscsi_queue+0x130/0x840 [vmw_pvscsi] [ 3.002970] [<ffffffff8151cbe0>] ? ftrace_raw_event_scsi_dispatch_cmd_error+0x220/0x220 [ 3.004681] [<ffffffff8151d2f7>] scsi_dispatch_cmd+0xb7/0x4e0 [ 3.006095] [<ffffffff8152575c>] scsi_request_fn+0x33c/0x540 [ 3.007299] [<ffffffff81396003>] __blk_run_queue+0x33/0x40 [ 3.008464] [<ffffffff813a0799>] blk_execute_rq_nowait+0xa9/0x140 [ 3.009751] [<ffffffff813a0993>] blk_execute_rq+0x133/0x1e0 [ 3.010954] [<ffffffff81272639>] ? bio_phys_segments+0x19/0x20 [ 3.012195] [<ffffffff8139bbb2>] ? blk_rq_bio_prep+0x72/0xf0 [ 3.013393] [<ffffffff81524207>] scsi_execute+0xd7/0x160 [ 3.014523] [<ffffffff81525a4c>] scsi_execute_req_flags+0x8c/0x100 [ 3.015833] [<ffffffff81527f95>] scsi_probe_and_add_lun+0x235/0xc50 [ 3.036404] [<ffffffff8150943c>] ? __pm_runtime_resume+0x5c/0x90 [ 3.037679] [<ffffffff81528e70>] __scsi_scan_target+0x110/0x6d0 [ 3.038936] [<ffffffff817daba6>] ? _raw_spin_unlock_irqrestore+0x36/0x70 [ 3.040345] [<ffffffff810f8b45>] ? trace_hardirqs_on_caller+0x105/0x1d0 [ 3.041741] [<ffffffff810f8c1d>] ? trace_hardirqs_on+0xd/0x10 [ 3.042957] [<ffffffff815295a6>] scsi_scan_channel.part.6+0x66/0x90 [ 3.044288] [<ffffffff81529769>] scsi_scan_host_selected+0xf9/0x1c0 [ 3.045773] [<ffffffff815298c1>] do_scsi_scan_host+0x91/0xa0 [ 3.046977] [<ffffffff81529a9c>] do_scan_async+0x1c/0x160 [ 3.048125] [<ffffffff810cc629>] async_run_entry_fn+0x39/0x120 [ 3.049358] [<ffffffff810bba30>] process_one_work+0x220/0x6f0 [ 3.050572] [<ffffffff810bb9c4>] ? process_one_work+0x1b4/0x6f0 [ 3.051822] [<ffffffff810bc01b>] worker_thread+0x11b/0x3a0 [ 3.052987] [<ffffffff810bbf00>] ? process_one_work+0x6f0/0x6f0 [ 3.054239] [<ffffffff810c43bf>] kthread+0xff/0x120 [ 3.055285] [<ffffffff810c42c0>] ? insert_kthread_work+0x80/0x80 [ 3.056558] [<ffffffff817e577c>] ret_from_fork+0x7c/0xb0 [ 3.057686] [<ffffffff810c42c0>] ? insert_kthread_work+0x80/0x80 [ 3.058954] ---[ end trace df8f36ebf71b314f ]--- [ 3.059922] Mapped at: [ 3.060431] [<ffffffff813f4821>] debug_dma_map_page+0x91/0x140 [ 3.061699] [<ffffffffa001a911>] pvscsi_queue+0x281/0x840 [vmw_pvscsi] [ 3.063105] [<ffffffff8151d2f7>] scsi_dispatch_cmd+0xb7/0x4e0 [ 3.064351] [<ffffffff8152575c>] scsi_request_fn+0x33c/0x540 [ 3.065607] [<ffffffff81396003>] __blk_run_queue+0x33/0x40 [1] https://bugzilla.redhat.com/show_bug.cgi?id=926917 [2] https://bugzilla.redhat.com/show_bug.cgi?id=1077118 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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