From: Jason Gunthorpe <jgg@ziepe.ca>
To: Christoph Hellwig <hch@lst.de>, Potnuri Bharat Teja <bharat@chelsio.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
dri-devel@lists.freedesktop.org, linux-mm@kvack.org,
devel@driverdev.osuosl.org, linux-s390@vger.kernel.org,
linux-rdma@vger.kernel.org, David Airlie <airlied@linux.ie>,
Dan Carpenter <dan.carpenter@oracle.com>,
linux-media@vger.kernel.org,
Intel Linux Wireless <linuxwifi@intel.com>,
intel-gfx@lists.freedesktop.org,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Jani Nikula <jani.nikula@linux.intel.com>,
Ian Abbott <abbotti@mev.co.uk>,
Rodrigo Vivi <rodrigo.vivi@intel.com>,
Sean Paul <sean@poorly.run>,
"moderated list:ARM PORT" <linux-arm-kernel@lists.infradead.org>,
netdev@vger.kernel.org, linux-wireless@vger.kernel.org,
linux-kernel@vger.kernel.org,
H Hartley Sweeten <hsweeten@visionengravers.com>,
iommu@lists.linux-foundation.org, Daniel Vetter <daniel@ffwll.ch>
Subject: Re: use exact allocation for dma coherent memory
Date: Wed, 19 Jun 2019 13:29:03 -0300 [thread overview]
Message-ID: <20190619162903.GF9360@ziepe.ca> (raw)
In-Reply-To: <20190617083342.GA7883@lst.de>
On Mon, Jun 17, 2019 at 10:33:42AM +0200, Christoph Hellwig wrote:
> > drivers/infiniband/hw/cxgb4/qp.c
> > 129 static int alloc_host_sq(struct c4iw_rdev *rdev, struct t4_sq *sq)
> > 130 {
> > 131 sq->queue = dma_alloc_coherent(&(rdev->lldi.pdev->dev), sq->memsize,
> > 132 &(sq->dma_addr), GFP_KERNEL);
> > 133 if (!sq->queue)
> > 134 return -ENOMEM;
> > 135 sq->phys_addr = virt_to_phys(sq->queue);
> > 136 dma_unmap_addr_set(sq, mapping, sq->dma_addr);
> > 137 return 0;
> > 138 }
> >
> > Is this a bug?
>
> Yes. This will blow up badly on many platforms, as sq->queue
> might be vmapped, ioremapped, come from a pool without page backing.
Gah, this addr gets fed into io_remap_pfn_range/remap_pfn_range too..
Potnuri, you should fix this..
You probably need to use dma_mmap_from_dev_coherent() in the mmap ?
Jason
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next prev parent reply other threads:[~2019-06-19 16:29 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-14 13:47 use exact allocation for dma coherent memory Christoph Hellwig
2019-06-14 13:47 ` [PATCH 01/16] media: videobuf-dma-contig: use dma_mmap_coherent Christoph Hellwig
2019-06-14 13:47 ` [PATCH 02/16] drm/ati_pcigart: stop using drm_pci_alloc Christoph Hellwig
2019-06-14 13:47 ` [PATCH 03/16] drm/i915: " Christoph Hellwig
2019-06-14 16:45 ` [Intel-gfx] " Ville Syrjälä
2019-06-14 13:47 ` [PATCH 04/16] drm: move drm_pci_{alloc,free} to drm_legacy Christoph Hellwig
2019-06-14 13:47 ` [PATCH 05/16] drm: don't mark pages returned from drm_pci_alloc reserved Christoph Hellwig
2019-06-14 13:47 ` [PATCH 06/16] drm: don't pass __GFP_COMP to dma_alloc_coherent in drm_pci_alloc Christoph Hellwig
2019-06-14 13:47 ` [PATCH 07/16] IB/hfi1: stop passing bogus gfp flags arguments to dma_alloc_coherent Christoph Hellwig
2019-06-14 13:47 ` [PATCH 08/16] IB/qib: " Christoph Hellwig
2019-06-14 13:47 ` [PATCH 09/16] cnic: " Christoph Hellwig
2019-06-14 13:47 ` [PATCH 10/16] iwlwifi: " Christoph Hellwig
2019-06-14 13:47 ` [PATCH 11/16] s390/ism: " Christoph Hellwig
2019-06-14 13:47 ` [PATCH 12/16] staging/comedi: mark as broken Christoph Hellwig
2019-06-14 14:02 ` Greg KH
2019-06-14 14:48 ` Christoph Hellwig
2019-06-14 15:30 ` Greg KH
2019-06-14 15:34 ` Christoph Hellwig
2019-06-17 13:15 ` Ian Abbott
2019-06-14 13:47 ` [PATCH 13/16] mm: rename alloc_pages_exact_nid to alloc_pages_exact_node Christoph Hellwig
2019-06-14 13:47 ` [PATCH 14/16] mm: use alloc_pages_exact_node to implement alloc_pages_exact Christoph Hellwig
2019-06-14 13:47 ` [PATCH 15/16] dma-mapping: clear __GFP_COMP in dma_alloc_attrs Christoph Hellwig
2019-06-14 13:47 ` [PATCH 16/16] dma-mapping: use exact allocation in dma_alloc_contiguous Christoph Hellwig
2019-06-14 14:15 ` David Laight
2019-06-14 14:50 ` 'Christoph Hellwig'
2019-06-14 15:01 ` David Laight
2019-06-14 15:05 ` 'Christoph Hellwig'
2019-06-14 15:05 ` Robin Murphy
2019-06-14 15:08 ` 'Christoph Hellwig'
2019-06-14 15:16 ` David Laight
2019-06-17 8:21 ` use exact allocation for dma coherent memory Dan Carpenter
2019-06-17 8:33 ` Christoph Hellwig
2019-06-19 16:29 ` Jason Gunthorpe [this message]
2019-06-20 10:51 ` Christoph Hellwig
2019-07-01 8:48 ` Christoph Hellwig
2019-07-02 9:48 ` Arend Van Spriel
2019-07-08 18:43 ` Christoph Hellwig
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