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Mon, 9 Aug 2021 19:59:44 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NEFpvwjXFb1y for ; Mon, 9 Aug 2021 19:59:42 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp3.osuosl.org (Postfix) with ESMTP id CD431605D4 for ; Mon, 9 Aug 2021 19:59:42 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id F19E66D; Mon, 9 Aug 2021 12:59:41 -0700 (PDT) Received: from [10.57.36.146] (unknown [10.57.36.146]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3261C3F40C; Mon, 9 Aug 2021 12:59:40 -0700 (PDT) Subject: Re: [PATCH v3 24/25] iommu/dma: Factor out flush queue init To: Rajat Jain References: <3b5284ee394f267ba966839173f874fc9a996bb2.1628094601.git.robin.murphy@arm.com> From: Robin Murphy Message-ID: <00baf83a-5eb3-4d72-309c-5adfd3242c07@arm.com> Date: Mon, 9 Aug 2021 20:59:35 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-GB Cc: linux-kernel@vger.kernel.org, dianders@chromium.org, iommu@lists.linux-foundation.org, will@kernel.org, linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 2021-08-09 20:05, Rajat Jain wrote: > On Wed, Aug 4, 2021 at 10:16 AM Robin Murphy wrote: >> >> Factor out flush queue setup from the initial domain init so that we >> can potentially trigger it from sysfs later on in a domain's lifetime. >> >> Reviewed-by: Lu Baolu >> Reviewed-by: John Garry >> Signed-off-by: Robin Murphy >> --- >> drivers/iommu/dma-iommu.c | 30 ++++++++++++++++++++---------- >> include/linux/dma-iommu.h | 9 ++++++--- >> 2 files changed, 26 insertions(+), 13 deletions(-) >> >> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c >> index 2e19505dddf9..f51b8dc99ac6 100644 >> --- a/drivers/iommu/dma-iommu.c >> +++ b/drivers/iommu/dma-iommu.c >> @@ -310,6 +310,25 @@ static bool dev_is_untrusted(struct device *dev) >> return dev_is_pci(dev) && to_pci_dev(dev)->untrusted; >> } >> >> +int iommu_dma_init_fq(struct iommu_domain *domain) >> +{ >> + struct iommu_dma_cookie *cookie = domain->iova_cookie; >> + >> + if (domain->type != IOMMU_DOMAIN_DMA_FQ) >> + return -EINVAL; >> + if (cookie->fq_domain) >> + return 0; >> + >> + if (init_iova_flush_queue(&cookie->iovad, iommu_dma_flush_iotlb_all, >> + iommu_dma_entry_dtor)) { >> + pr_warn("iova flush queue initialization failed\n"); >> + domain->type = IOMMU_DOMAIN_DMA; >> + return -ENODEV; >> + } >> + cookie->fq_domain = domain; >> + return 0; >> +} >> + >> /** >> * iommu_dma_init_domain - Initialise a DMA mapping domain >> * @domain: IOMMU domain previously prepared by iommu_get_dma_cookie() >> @@ -362,16 +381,7 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, >> } >> >> init_iova_domain(iovad, 1UL << order, base_pfn); >> - >> - if (domain->type == IOMMU_DOMAIN_DMA_FQ && !cookie->fq_domain) { >> - if (init_iova_flush_queue(iovad, iommu_dma_flush_iotlb_all, >> - iommu_dma_entry_dtor)) { >> - pr_warn("iova flush queue initialization failed\n"); >> - domain->type = IOMMU_DOMAIN_DMA; >> - } else { >> - cookie->fq_domain = domain; >> - } >> - } >> + iommu_dma_init_fq(domain); >> >> return iova_reserve_iommu_regions(dev, domain); >> } >> diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h >> index 758ca4694257..81ab647f1618 100644 >> --- a/include/linux/dma-iommu.h >> +++ b/include/linux/dma-iommu.h >> @@ -20,6 +20,7 @@ void iommu_put_dma_cookie(struct iommu_domain *domain); >> >> /* Setup call for arch DMA mapping code */ >> void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit); >> +int iommu_dma_init_fq(struct iommu_domain *domain); >> >> /* The DMA API isn't _quite_ the whole story, though... */ >> /* >> @@ -37,9 +38,6 @@ void iommu_dma_compose_msi_msg(struct msi_desc *desc, >> >> void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list); >> >> -void iommu_dma_free_cpu_cached_iovas(unsigned int cpu, >> - struct iommu_domain *domain); >> - > > This looks like an unrelated code cleanup. Should this be a separate patch? Ha, busted! Much of this was done in the "stream of consciousness" style where I made a big sprawling mess then split it up into patches and branches afterwards. TBH it was already feeling pretty tenuous having a separate patch just to move this one function, and it only gets more so with the simplification Will pointed out earlier. I think I'll squash iommu_dma_init_fq() into the next patch then do a thorough header sweep, since I've now spotted some things in iova.h which could probably go as well. Thanks for the poke! Robin. > > Thanks, > > Rajat > > >> extern bool iommu_dma_forcedac; >> >> #else /* CONFIG_IOMMU_DMA */ >> @@ -54,6 +52,11 @@ static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base, >> { >> } >> >> +static inline int iommu_dma_init_fq(struct iommu_domain *domain) >> +{ >> + return -EINVAL; >> +} >> + >> static inline int iommu_get_dma_cookie(struct iommu_domain *domain) >> { >> return -ENODEV; >> -- >> 2.25.1 >> _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu