linux-kernel - Re: [PATCH v6 00/16] dma-mapping: migrate to physical address-based API

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Message-ID: <aM1_9cS_LGl4GFC5@kbusch-mbp>
Date: Fri, 19 Sep 2025 10:08:21 -0600
From: Keith Busch <kbusch@...nel.org>
To: Leon Romanovsky <leon@...nel.org>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Abdiel Janulgue <abdiel.janulgue@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@....de>, Danilo Krummrich <dakr@...nel.org>,
	David Hildenbrand <david@...hat.com>, iommu@...ts.linux.dev,
	Jason Wang <jasowang@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	Joerg Roedel <joro@...tes.org>, Jonathan Corbet <corbet@....net>,
	Juergen Gross <jgross@...e.com>, kasan-dev@...glegroups.com,
	linux-block@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-nvme@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
	linux-trace-kernel@...r.kernel.org,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Robin Murphy <robin.murphy@....com>, rust-for-linux@...r.kernel.org,
	Sagi Grimberg <sagi@...mberg.me>,
	Stefano Stabellini <sstabellini@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	virtualization@...ts.linux.dev, Will Deacon <will@...nel.org>,
	xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v6 00/16] dma-mapping: migrate to physical address-based
 API

On Fri, Sep 12, 2025 at 12:03:27PM +0300, Leon Romanovsky wrote:
> On Fri, Sep 12, 2025 at 12:25:38AM +0200, Marek Szyprowski wrote:
> > >
> > > This series does the core code and modern flows. A followup series
> > > will give the same treatment to the legacy dma_ops implementation.
> > 
> > Applied patches 1-13 into dma-mapping-for-next branch. Let's check if it 
> > works fine in linux-next.
> 
> Thanks a lot.

Just fyi, when dma debug is enabled, we're seeing this new warning
below. I have not had a chance to look into it yet, so I'm just
reporting the observation.

 DMA-API: nvme 0006:01:00.0: cacheline tracking EEXIST, overlapping mappings aren't supported
 WARNING: kernel/dma/debug.c:598 at add_dma_entry+0x26c/0x328, CPU#1: (udev-worker)/773
 Modules linked in: acpi_power_meter(E) loop(E) efivarfs(E) autofs4(E)
 CPU: 1 UID: 0 PID: 773 Comm: (udev-worker) Tainted: G            E    N  6.17.0-rc6-next-20250918-debug #6 PREEMPT(none)
 Tainted: [E]=UNSIGNED_MODULE, [N]=TEST
 pstate: 63400009 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
 pc : add_dma_entry+0x26c/0x328
 lr : add_dma_entry+0x26c/0x328
 sp : ffff80009fe0f460
 x29: ffff80009fe0f470 x28: 0000000000000001 x27: 0000000000000001
 x26: ffff8000835d7f38 x25: ffff8000835d7000 x24: ffff8000835d7e60
 x23: 0000000000000000 x22: 0000000006e2cc00 x21: 0000000000000000
 x20: ffff800082e8f218 x19: ffff0000a908ff80 x18: 00000000ffffffff
 x17: ffff8000801972a0 x16: ffff800080197054 x15: 0000000000000000
 x14: 0000000000000000 x13: 0000000000000004 x12: 0000000000020006
 x11: 0000000030e4ef9f x10: ffff800083443358 x9 : ffff80008019499c
 x8 : 00000000fffeffff x7 : ffff800083443358 x6 : 0000000000000000
 x5 : 00000000000bfff4 x4 : 0000000000000000 x3 : ffff0000bb005ac0
 x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000bb005ac0
 Call trace:
  add_dma_entry+0x26c/0x328 (P)
  debug_dma_map_phys+0xc4/0xf0
  dma_map_phys+0xe0/0x410
  dma_map_page_attrs+0x94/0xf8
  blk_dma_map_direct.isra.0+0x64/0xb8
  blk_rq_dma_map_iter_next+0x6c/0xc8
  nvme_prep_rq+0x894/0xa98
  nvme_queue_rqs+0xb0/0x1a0
  blk_mq_dispatch_queue_requests+0x268/0x3b8
  blk_mq_flush_plug_list+0x90/0x188
  __blk_flush_plug+0x104/0x170
  blk_finish_plug+0x38/0x50
  read_pages+0x1a4/0x3b8
  page_cache_ra_unbounded+0x1a0/0x400
  force_page_cache_ra+0xa8/0xd8
  page_cache_sync_ra+0xa0/0x3f8
  filemap_get_pages+0x104/0x950
  filemap_read+0xf4/0x498
  blkdev_read_iter+0x88/0x180
  vfs_read+0x214/0x310
  ksys_read+0x70/0x110
  __arm64_sys_read+0x20/0x30
  invoke_syscall+0x4c/0x118
  el0_svc_common.constprop.0+0xc4/0xf0
  do_el0_svc+0x24/0x38
  el0_svc+0x1a0/0x340
  el0t_64_sync_handler+0x98/0xe0
  el0t_64_sync+0x17c/0x180
 ---[ end trace 0000000000000000 ]---