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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Jim Quinlan <james.quinlan@broadcom.com>,
	heikki.krogerus@linux.intel.com,
	linux-devicetree <devicetree@vger.kernel.org>,
	peterz@infradead.org, linux-pci@vger.kernel.org,
	joonas.lahtinen@linux.intel.com, dri-devel@lists.freedesktop.org,
	chris@chris-wilson.co.uk, grant.likely@arm.com, paulus@samba.org,
	Frank Rowand <frowand.list@gmail.com>,
	mingo@kernel.org, Jianxiong Gao <jxgao@google.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Saravana Kannan <saravanak@google.com>,
	mpe@ellerman.id.au,
	"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	xypron.glpk@gmx.de,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	bskeggs@redhat.com, benh@kernel.crashing.org,
	xen-devel@lists.xenproject.org,
	Thierry Reding <treding@nvidia.com>,
	matthew.auld@intel.com, Nicolas Boichat <drinkcat@chromium.org>,
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	Will Deacon <will@kernel.org>,
	intel-gfx@lists.freedesktop.org,
	maarten.lankhorst@linux.intel.com, jani.nikula@linux.intel.com,
	Nathan Chancellor <nathan@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	rodrigo.vivi@intel.com, Bjorn Helgaas <bhelgaas@google.com>,
	Claire Chang <tientzu@chromium.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	boris.ostrovsky@oracle.com, airlied@linux.ie,
	linuxppc-dev@lists.ozlabs.org,
	Randy Dunlap <rdunlap@infradead.org>,
	Qian Cai <quic_qiancai@quicinc.com>,
	lkml <linux-kernel@vger.kernel.org>,
	"list@263.net:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>,
	Daniel Vetter <daniel@ffwll.ch>,
	Greg KH <gregkh@linuxfoundation.org>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Robin Murphy <robin.murphy@arm.com>,
	bauerman@linux.ibm.com
Subject: Re: [PATCH v15 06/12] swiotlb: Use is_swiotlb_force_bounce for swiotlb data bouncing
Date: Tue, 6 Jul 2021 10:46:07 -0400	[thread overview]
Message-ID: <YORsr0h7u5l9DZwh@char.us.oracle.com> (raw)
In-Reply-To: <20210706140513.GA26498@lst.de>

On Tue, Jul 06, 2021 at 04:05:13PM +0200, Christoph Hellwig wrote:
> On Tue, Jul 06, 2021 at 03:01:04PM +0100, Robin Murphy wrote:
> > FWIW I was pondering the question of whether to do something along those 
> > lines or just scrap the default assignment entirely, so since I hadn't got 
> > round to saying that I've gone ahead and hacked up the alternative 
> > (similarly untested) for comparison :)
> >
> > TBH I'm still not sure which one I prefer...
> 
> Claire did implement something like your suggestion originally, but
> I don't really like it as it doesn't scale for adding multiple global
> pools, e.g. for the 64-bit addressable one for the various encrypted
> secure guest schemes.

Couple of things:
 - I am not pushing to Linus the Claire's patchset until we have a
   resolution on this. I hope you all agree that is a sensible way
   forward as much as I hate doing that.

 - I like Robin's fix as it is simplest looking. Would love to see if it
   does fix the problem.

 - Christopher - we can always add multiple pools as the next milestone
   and just focus on this feature getting tested extensively during this
   release.

 - Would it be worth (for future or maybe in another tiny fix) to also add
   a printk in swiotlb when we de-allocate the buffer so when someone looks
   through the `dmesg` it becomes much easier to diagnose issues?

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  reply	other threads:[~2021-07-06 14:48 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-24 15:55 [PATCH v15 00/12] Restricted DMA Claire Chang
2021-06-24 15:55 ` [PATCH v15 01/12] swiotlb: Refactor swiotlb init functions Claire Chang
2021-06-24 15:55 ` [PATCH v15 02/12] swiotlb: Refactor swiotlb_create_debugfs Claire Chang
2021-06-24 15:55 ` [PATCH v15 03/12] swiotlb: Set dev->dma_io_tlb_mem to the swiotlb pool used Claire Chang
2021-06-24 15:55 ` [PATCH v15 04/12] swiotlb: Update is_swiotlb_buffer to add a struct device argument Claire Chang
2021-06-24 15:55 ` [PATCH v15 05/12] swiotlb: Update is_swiotlb_active " Claire Chang
2021-06-24 15:55 ` [PATCH v15 06/12] swiotlb: Use is_swiotlb_force_bounce for swiotlb data bouncing Claire Chang
2021-06-30  1:43   ` Nathan Chancellor
2021-06-30  9:17     ` Claire Chang
2021-06-30 11:43       ` Will Deacon
2021-06-30 15:56         ` Nathan Chancellor
2021-07-01  7:40           ` Will Deacon
2021-07-01  7:52             ` Nathan Chancellor
2021-07-02 13:58               ` Will Deacon
2021-07-02 15:13                 ` Robin Murphy
2021-07-03  5:55                   ` Nathan Chancellor
2021-07-05  7:29                     ` Claire Chang
2021-07-05 18:25                       ` Nathan Chancellor
2021-07-05 19:03                     ` Will Deacon
2021-07-06  4:48                       ` Christoph Hellwig
2021-07-06 13:24                         ` Will Deacon
2021-07-06 14:01                           ` Robin Murphy
2021-07-06 14:05                             ` Christoph Hellwig
2021-07-06 14:46                               ` Konrad Rzeszutek Wilk [this message]
2021-07-06 16:57                                 ` Will Deacon
2021-07-06 16:59                                   ` Konrad Rzeszutek Wilk
2021-07-12 13:56                                     ` Will Deacon
2021-07-14  0:06                                       ` Konrad Rzeszutek Wilk
2021-07-06 15:39                               ` Robin Murphy
2021-07-06 17:06                                 ` Will Deacon
2021-07-06 19:14                                   ` Nathan Chancellor
2021-07-08 16:44                                     ` Will Deacon
2021-06-24 15:55 ` [PATCH v15 07/12] swiotlb: Move alloc_size to swiotlb_find_slots Claire Chang
2021-06-24 15:55 ` [PATCH v15 08/12] swiotlb: Refactor swiotlb_tbl_unmap_single Claire Chang
2021-06-24 15:55 ` [PATCH v15 09/12] swiotlb: Add restricted DMA alloc/free support Claire Chang
2021-06-24 15:55 ` [PATCH v15 10/12] swiotlb: Add restricted DMA pool initialization Claire Chang
2021-08-24 14:26   ` Guenter Roeck
2021-08-27  3:50     ` Claire Chang
2021-08-27  6:58   ` Andy Shevchenko
2021-06-24 15:55 ` [PATCH v15 11/12] dt-bindings: of: Add restricted DMA pool Claire Chang
2021-06-24 15:55 ` [PATCH v15 12/12] of: Add plumbing for " Claire Chang
2021-07-02  3:08   ` Guenter Roeck
2021-07-02 11:39     ` Robin Murphy
2021-07-02 13:18       ` Will Deacon
2021-07-02 13:48         ` Guenter Roeck
2021-06-24 19:19 ` [PATCH v15 00/12] Restricted DMA Konrad Rzeszutek Wilk
2021-06-25  0:41   ` Claire Chang
2021-06-25 12:30   ` Will Deacon

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