Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754427Ab0KMDaX (ORCPT ); Fri, 12 Nov 2010 22:30:23 -0500 Received: from wolverine01.qualcomm.com ([199.106.114.254]:28676 "EHLO wolverine01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753981Ab0KMDaO (ORCPT ); Fri, 12 Nov 2010 22:30:14 -0500 X-IronPort-AV: E=McAfee;i="5400,1158,6165"; a="61810878" From: Stepan Moskovchenko To: dwalker@codeaurora.org Cc: davidb@codeaurora.org, bryanh@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Stepan Moskovchenko Subject: [PATCH 08/14] msm: iommu: Don't flush page tables if no devices attached Date: Fri, 12 Nov 2010 19:29:54 -0800 Message-Id: <1289619000-13167-9-git-send-email-stepanm@codeaurora.org> X-Mailer: git-send-email 1.7.0.2 In-Reply-To: <1289619000-13167-1-git-send-email-stepanm@codeaurora.org> References: <1289619000-13167-1-git-send-email-stepanm@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1719 Lines: 49 Don't flush the page tables on an IOMMU domain if there are no IOMMU devices attached to the domain. The act of attaching to the domain will cause an implicit flush of those areas if the page tables are configured to not be L2 cacheable. Signed-off-by: Stepan Moskovchenko --- arch/arm/mach-msm/iommu.c | 15 +++++++++------ 1 files changed, 9 insertions(+), 6 deletions(-) diff --git a/arch/arm/mach-msm/iommu.c b/arch/arm/mach-msm/iommu.c index 134add7..74f2157 100644 --- a/arch/arm/mach-msm/iommu.c +++ b/arch/arm/mach-msm/iommu.c @@ -50,13 +50,16 @@ static void __flush_iotlb(struct iommu_domain *domain) unsigned long *fl_table = priv->pgtable; int i; - dmac_flush_range(fl_table, fl_table + SZ_16K); + if (!list_empty(&priv->list_attached)) { + dmac_flush_range(fl_table, fl_table + SZ_16K); - for (i = 0; i < NUM_FL_PTE; i++) - if ((fl_table[i] & 0x03) == FL_TYPE_TABLE) { - void *sl_table = __va(fl_table[i] & FL_BASE_MASK); - dmac_flush_range(sl_table, sl_table + SZ_4K); - } + for (i = 0; i < NUM_FL_PTE; i++) + if ((fl_table[i] & 0x03) == FL_TYPE_TABLE) { + void *sl_table = __va(fl_table[i] & + FL_BASE_MASK); + dmac_flush_range(sl_table, sl_table + SZ_4K); + } + } #endif list_for_each_entry(ctx_drvdata, &priv->list_attached, attached_elm) { -- 1.7.0.2 Sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. -- 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/