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d="scan'208";a="435375555" Received: from allen-box.sh.intel.com (HELO [10.239.159.128]) ([10.239.159.128]) by fmsmga004.fm.intel.com with ESMTP; 22 Mar 2021 19:06:31 -0700 Subject: Re: [PATCH 2/3] iommu/vt-d: Remove IOVA domain rcache flushing for CPU offlining To: John Garry , dwmw2@infradead.org, joro@8bytes.org, will@kernel.org References: <1614600741-15696-1-git-send-email-john.garry@huawei.com> <1614600741-15696-3-git-send-email-john.garry@huawei.com> From: Lu Baolu Message-ID: Date: Tue, 23 Mar 2021 09:57:13 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <1614600741-15696-3-git-send-email-john.garry@huawei.com> Content-Language: en-US Cc: robin.murphy@arm.com, iommu@lists.linux-foundation.org, linuxarm@huawei.com, linux-kernel@vger.kernel.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 3/1/21 8:12 PM, John Garry wrote: > Now that the core code handles flushing per-IOVA domain CPU rcaches, > remove the handling here. > > Signed-off-by: John Garry > --- > drivers/iommu/intel/iommu.c | 31 ------------------------------- > include/linux/cpuhotplug.h | 1 - > 2 files changed, 32 deletions(-) > > diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c > index ee0932307d64..d1e66e1b07b8 100644 > --- a/drivers/iommu/intel/iommu.c > +++ b/drivers/iommu/intel/iommu.c > @@ -4065,35 +4065,6 @@ static struct notifier_block intel_iommu_memory_nb = { > .priority = 0 > }; > > -static void free_all_cpu_cached_iovas(unsigned int cpu) > -{ > - int i; > - > - for (i = 0; i < g_num_of_iommus; i++) { > - struct intel_iommu *iommu = g_iommus[i]; > - struct dmar_domain *domain; > - int did; > - > - if (!iommu) > - continue; > - > - for (did = 0; did < cap_ndoms(iommu->cap); did++) { > - domain = get_iommu_domain(iommu, (u16)did); > - > - if (!domain || domain->domain.type != IOMMU_DOMAIN_DMA) > - continue; > - > - iommu_dma_free_cpu_cached_iovas(cpu, &domain->domain); > - } > - } > -} > - > -static int intel_iommu_cpu_dead(unsigned int cpu) > -{ > - free_all_cpu_cached_iovas(cpu); > - return 0; > -} > - > static void intel_disable_iommus(void) > { > struct intel_iommu *iommu = NULL; > @@ -4388,8 +4359,6 @@ int __init intel_iommu_init(void) > bus_set_iommu(&pci_bus_type, &intel_iommu_ops); > if (si_domain && !hw_pass_through) > register_memory_notifier(&intel_iommu_memory_nb); > - cpuhp_setup_state(CPUHP_IOMMU_INTEL_DEAD, "iommu/intel:dead", NULL, > - intel_iommu_cpu_dead); > > down_read(&dmar_global_lock); > if (probe_acpi_namespace_devices()) > diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h > index cedac9986557..85996494bec1 100644 > --- a/include/linux/cpuhotplug.h > +++ b/include/linux/cpuhotplug.h > @@ -57,7 +57,6 @@ enum cpuhp_state { > CPUHP_PAGE_ALLOC_DEAD, > CPUHP_NET_DEV_DEAD, > CPUHP_PCI_XGENE_DEAD, > - CPUHP_IOMMU_INTEL_DEAD, > CPUHP_IOMMU_IOVA_DEAD, > CPUHP_LUSTRE_CFS_DEAD, > CPUHP_AP_ARM_CACHE_B15_RAC_DEAD, > Reviewed-by: Lu Baolu Best regards, baolu _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu