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From: John Stultz <john.stultz@linaro.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
	Sumit Semwal <sumit.semwal@linaro.org>,
	Liam Mark <lmark@codeaurora.org>,
	Laura Abbott <labbott@kernel.org>,
	Brian Starkey <Brian.Starkey@arm.com>,
	Hridya Valsaraju <hridya@google.com>,
	Suren Baghdasaryan <surenb@google.com>,
	Sandeep Patil <sspatil@google.com>,
	Daniel Mentz <danielmentz@google.com>,
	Chris Goldsworthy <cgoldswo@codeaurora.org>,
	"??rjan Eide" <orjan.eide@arm.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Ezequiel Garcia <ezequiel@collabora.com>,
	Simon Ser <contact@emersion.fr>, James Jones <jajones@nvidia.com>,
	linux-media <linux-media@vger.kernel.org>,
	dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: [PATCH v3 7/7] dma-buf: system_heap: Add a system-uncached heap re-using the system heap
Date: Wed, 7 Oct 2020 22:03:43 -0700	[thread overview]
Message-ID: <CALAqxLWSq3szE40hC_m-qpOOH1193jYLOT1_ZZh-eW9U0gnG8w@mail.gmail.com> (raw)
In-Reply-To: <20201005134528.GA11644@infradead.org>

On Mon, Oct 5, 2020 at 6:45 AM Christoph Hellwig <hch@infradead.org> wrote:
>
> How is this going to deal with VIVT caches?

Hrm. That's a good question.   I'm not sure I totally have my head
around it but, I guess we could make sure to call
invalidate_kernel_vmap_range() in begin_cpu_access()  and
flush_kernel_vmap_range() in end_cpu_access() rather then exiting out
early as we do now?

Unless you have better guidance?

Worse case we could check CONFIG_CPU_CACHE_VIVT and not register the
system-uncached heap.

thanks
-john

  reply	other threads:[~2020-10-08  5:04 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-03  4:02 [PATCH v3 0/7] dma-buf: Performance improvements for system heap & a system-uncached implementation John Stultz
2020-10-03  4:02 ` [PATCH v3 1/7] dma-buf: system_heap: Rework system heap to use sgtables instead of pagelists John Stultz
2020-10-03  4:02 ` [PATCH v3 2/7] dma-buf: heaps: Move heap-helper logic into the cma_heap implementation John Stultz
2020-10-03  4:02 ` [PATCH v3 3/7] dma-buf: heaps: Remove heap-helpers code John Stultz
2020-10-03  4:02 ` [PATCH v3 4/7] dma-buf: heaps: Skip sync if not mapped John Stultz
2020-10-03  4:02 ` [PATCH v3 5/7] dma-buf: system_heap: Allocate higher order pages if available John Stultz
2020-10-03  4:02 ` [PATCH v3 6/7] dma-buf: dma-heap: Keep track of the heap device struct John Stultz
2020-10-03  4:02 ` [PATCH v3 7/7] dma-buf: system_heap: Add a system-uncached heap re-using the system heap John Stultz
2020-10-05 13:45   ` Christoph Hellwig
2020-10-08  5:03     ` John Stultz [this message]
2020-10-08 11:51   ` Brian Starkey
2020-10-16 19:03     ` John Stultz
2020-10-16 23:15       ` John Stultz
2021-01-29  1:23       ` Daniel Mentz
2020-10-08 11:36 ` [PATCH v3 0/7] dma-buf: Performance improvements for system heap & a system-uncached implementation Brian Starkey
2020-10-16 18:47   ` John Stultz

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