Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754630AbaJUIE4 (ORCPT ); Tue, 21 Oct 2014 04:04:56 -0400 Received: from g4t3427.houston.hp.com ([15.201.208.55]:11041 "EHLO g4t3427.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754574AbaJUIEt (ORCPT ); Tue, 21 Oct 2014 04:04:49 -0400 From: "Li, Zhen-Hua" To: , , , , , Cc: , , , , , , , , , , , , , "Li, Zhen-Hua" Subject: [PATCH 1/5] iommu/vt-d: Update iommu_attach_domain() and its callers Date: Tue, 21 Oct 2014 16:04:15 +0800 Message-Id: <1413878659-1383-2-git-send-email-zhen-hual@hp.com> X-Mailer: git-send-email 2.0.0-rc0 In-Reply-To: <1413878659-1383-1-git-send-email-zhen-hual@hp.com> References: <1413878659-1383-1-git-send-email-zhen-hual@hp.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Allow specification of the domain-id for the new domain. This patch only adds the 'did' parameter to iommu_attach_domain() and modifies all of its callers to specify the default value of -1 which says "no did specified, allocate a new one". This is no functional change from current behaviour -- just enables a functional change to be made in a later patch. Bill Sumner: Original version. Li, Zhenhua: Minor change, add change to function __iommu_attach_domain. Signed-off-by: Bill Sumner Signed-off-by: Li, Zhen-Hua --- drivers/iommu/intel-iommu.c | 32 +++++++++++++++++++------------- 1 file changed, 19 insertions(+), 13 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index a27d6cb..1c7350d 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1531,31 +1531,36 @@ static struct dmar_domain *alloc_domain(int flags) } static int __iommu_attach_domain(struct dmar_domain *domain, - struct intel_iommu *iommu) + struct intel_iommu *iommu, + int domain_number) { int num; unsigned long ndomains; ndomains = cap_ndoms(iommu->cap); - num = find_first_zero_bit(iommu->domain_ids, ndomains); - if (num < ndomains) { - set_bit(num, iommu->domain_ids); - iommu->domains[num] = domain; - } else { - num = -ENOSPC; - } + if (domain_number < 0) { + num = find_first_zero_bit(iommu->domain_ids, ndomains); + if (num < ndomains) { + set_bit(num, iommu->domain_ids); + iommu->domains[num] = domain; + } else { + num = -ENOSPC; + } + } else + num = domain_number; return num; } static int iommu_attach_domain(struct dmar_domain *domain, - struct intel_iommu *iommu) + struct intel_iommu *iommu, + int domain_number) { int num; unsigned long flags; spin_lock_irqsave(&iommu->lock, flags); - num = __iommu_attach_domain(domain, iommu); + num = __iommu_attach_domain(domain, iommu, domain_number); spin_unlock_irqrestore(&iommu->lock, flags); if (num < 0) pr_err("IOMMU: no free domain ids\n"); @@ -1574,7 +1579,7 @@ static int iommu_attach_vm_domain(struct dmar_domain *domain, if (iommu->domains[num] == domain) return num; - return __iommu_attach_domain(domain, iommu); + return __iommu_attach_domain(domain, iommu, -1); } static void iommu_detach_domain(struct dmar_domain *domain, @@ -2230,6 +2235,7 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw) u16 dma_alias; unsigned long flags; u8 bus, devfn; + int did = -1; /* Default to "no domain_id supplied" */ domain = find_domain(dev); if (domain) @@ -2263,7 +2269,7 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw) domain = alloc_domain(0); if (!domain) return NULL; - domain->id = iommu_attach_domain(domain, iommu); + domain->id = iommu_attach_domain(domain, iommu, did); if (domain->id < 0) { free_domain_mem(domain); return NULL; @@ -2441,7 +2447,7 @@ static int __init si_domain_init(int hw) return -EFAULT; for_each_active_iommu(iommu, drhd) { - ret = iommu_attach_domain(si_domain, iommu); + ret = iommu_attach_domain(si_domain, iommu, -1); if (ret < 0) { domain_exit(si_domain); return -EFAULT; -- 2.0.0-rc0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/