From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E58C5C43334 for ; Tue, 14 Jun 2022 02:56:03 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 978B7417C4; Tue, 14 Jun 2022 02:56:03 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oRYJs5KE_y_R; Tue, 14 Jun 2022 02:56:02 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp4.osuosl.org (Postfix) with ESMTPS id 044F540985; Tue, 14 Jun 2022 02:56:02 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id CA201C0032; Tue, 14 Jun 2022 02:56:01 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [IPv6:2605:bc80:3010::137]) by lists.linuxfoundation.org (Postfix) with ESMTP id E6D8AC002D for ; Tue, 14 Jun 2022 02:56:00 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id C7BA7409ED for ; Tue, 14 Jun 2022 02:56:00 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7MgoTrQTEh-t for ; Tue, 14 Jun 2022 02:55:59 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by smtp4.osuosl.org (Postfix) with ESMTPS id B595940985 for ; Tue, 14 Jun 2022 02:55:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1655175359; x=1686711359; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=fgT3PdgsPjTnJV7XQS4uQIJjlx5l5+fnH5HeIY8TEvU=; b=SAbyF3xvw0Bkl2AOnsjeGA2c5pC06WC0uuKkTmVzGYfiXsEmJuLx1uiD KD8kbtkjIHxS8pK7aIR9Z+S5Ks1raQTEpXvyEZszbYsYZo51X8iFbpQ6X RXclwrxiQ9mEc7/l+5TYn/McokunV7FP3k7Epaums0mEwuUeixV/QSeUA 0mbS6ZcG1XVlbt9nBPS0DOC5heJ4qf9pWH04qmF5z9mMkUqECbCEIfIrq imZqGVazPyjCzM51HZc1zhfPAhqtbHDCKbHDdRCCMTIHCwUTHICLqm/6A 5ZRvF8KzSOMJezNR1gzf8mwWv9fKAZkgrRd3Ocsm085rwRL4GvKDwjonr g==; X-IronPort-AV: E=McAfee;i="6400,9594,10377"; a="303887136" X-IronPort-AV: E=Sophos;i="5.91,298,1647327600"; d="scan'208";a="303887136" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Jun 2022 19:55:59 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,298,1647327600"; d="scan'208";a="588166586" Received: from allen-box.sh.intel.com ([10.239.159.48]) by fmsmga007.fm.intel.com with ESMTP; 13 Jun 2022 19:55:56 -0700 From: Lu Baolu To: Joerg Roedel , Kevin Tian , Ashok Raj , Christoph Hellwig , Jason Gunthorpe Subject: [PATCH v2 08/12] iommu/vt-d: Replace spin_lock_irqsave() with spin_lock() Date: Tue, 14 Jun 2022 10:51:33 +0800 Message-Id: <20220614025137.1632762-9-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220614025137.1632762-1-baolu.lu@linux.intel.com> References: <20220614025137.1632762-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Cc: Will Deacon , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Jacob jun Pan , Robin Murphy 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-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" The iommu->lock is used to protect changes in root/context/pasid tables and domain ID allocation. There's no use case to change these resources in any interrupt context. Hence there's no need to disable interrupts when helding the spinlock. Signed-off-by: Lu Baolu --- drivers/iommu/intel/debugfs.c | 6 ++---- drivers/iommu/intel/iommu.c | 17 +++++++---------- 2 files changed, 9 insertions(+), 14 deletions(-) diff --git a/drivers/iommu/intel/debugfs.c b/drivers/iommu/intel/debugfs.c index 5ebfe32265d5..104f9d77b3f0 100644 --- a/drivers/iommu/intel/debugfs.c +++ b/drivers/iommu/intel/debugfs.c @@ -263,10 +263,9 @@ static void ctx_tbl_walk(struct seq_file *m, struct intel_iommu *iommu, u16 bus) static void root_tbl_walk(struct seq_file *m, struct intel_iommu *iommu) { - unsigned long flags; u16 bus; - spin_lock_irqsave(&iommu->lock, flags); + spin_lock(&iommu->lock); seq_printf(m, "IOMMU %s: Root Table Address: 0x%llx\n", iommu->name, (u64)virt_to_phys(iommu->root_entry)); seq_puts(m, "B.D.F\tRoot_entry\t\t\t\tContext_entry\t\t\t\tPASID\tPASID_table_entry\n"); @@ -278,8 +277,7 @@ static void root_tbl_walk(struct seq_file *m, struct intel_iommu *iommu) */ for (bus = 0; bus < 256; bus++) ctx_tbl_walk(m, iommu, bus); - - spin_unlock_irqrestore(&iommu->lock, flags); + spin_unlock(&iommu->lock); } static int dmar_translation_struct_show(struct seq_file *m, void *unused) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 12cd12fc86a4..aec33599c7f7 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -797,13 +797,12 @@ static int device_context_mapped(struct intel_iommu *iommu, u8 bus, u8 devfn) { struct context_entry *context; int ret = 0; - unsigned long flags; - spin_lock_irqsave(&iommu->lock, flags); + spin_lock(&iommu->lock); context = iommu_context_addr(iommu, bus, devfn, 0); if (context) ret = context_present(context); - spin_unlock_irqrestore(&iommu->lock, flags); + spin_unlock(&iommu->lock); return ret; } @@ -2295,16 +2294,15 @@ static void domain_context_clear_one(struct device_domain_info *info, u8 bus, u8 { struct intel_iommu *iommu = info->iommu; struct context_entry *context; - unsigned long flags; u16 did_old; if (!iommu) return; - spin_lock_irqsave(&iommu->lock, flags); + spin_lock(&iommu->lock); context = iommu_context_addr(iommu, bus, devfn, 0); if (!context) { - spin_unlock_irqrestore(&iommu->lock, flags); + spin_unlock(&iommu->lock); return; } @@ -2319,7 +2317,7 @@ static void domain_context_clear_one(struct device_domain_info *info, u8 bus, u8 context_clear_entry(context); __iommu_flush_cache(iommu, context, sizeof(*context)); - spin_unlock_irqrestore(&iommu->lock, flags); + spin_unlock(&iommu->lock); iommu->flush.flush_context(iommu, did_old, (((u16)bus) << 8) | devfn, @@ -2772,7 +2770,6 @@ static int copy_translation_tables(struct intel_iommu *iommu) struct root_entry *old_rt; phys_addr_t old_rt_phys; int ctxt_table_entries; - unsigned long flags; u64 rtaddr_reg; int bus, ret; bool new_ext, ext; @@ -2815,7 +2812,7 @@ static int copy_translation_tables(struct intel_iommu *iommu) } } - spin_lock_irqsave(&iommu->lock, flags); + spin_lock(&iommu->lock); /* Context tables are copied, now write them to the root_entry table */ for (bus = 0; bus < 256; bus++) { @@ -2834,7 +2831,7 @@ static int copy_translation_tables(struct intel_iommu *iommu) iommu->root_entry[bus].hi = val; } - spin_unlock_irqrestore(&iommu->lock, flags); + spin_unlock(&iommu->lock); kfree(ctxt_tbls); -- 2.25.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu