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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7564FC43334 for ; Sat, 2 Jul 2022 02:00:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231514AbiGBCAp (ORCPT ); Fri, 1 Jul 2022 22:00:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35044 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231293AbiGBCAm (ORCPT ); Fri, 1 Jul 2022 22:00:42 -0400 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 395A5403DA for ; Fri, 1 Jul 2022 19:00:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1656727242; x=1688263242; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=DFPmBvFWYw27ZARg+5iSaqlrtN1/1OkiNoJ7ea+BTfU=; b=fgic+F8qDXJDaGY93VGtEL3+R6WCo/YDY0zdLHylehKbWGYsmQ5xwwUE BvsMicTB6zwmevqOub1tIOb2los4hUzYNF40qi62HbZdYSYET3C4AiUip oN4wN1uBNoXa0vQZZVE6TPqwVqa1TtYRjd/QHA59CfAZeSiN/ZzJ5d6Bx U2C4YZOQzw33nJX22t5pcmbsER4gR+95z8y1BXcisNBx0X+CUfROMDcPA 8ScDW1wPaCZcURzngtuIeZlI+efdYxqUXWAj2hS8yR5vlS+07KvrcCst9 XJiL2fr7ec7YmI4Td0/SUEWfQv+ApQOwRbWnKcwi66bMxX/JowH8DypHC Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10395"; a="262573735" X-IronPort-AV: E=Sophos;i="5.92,238,1650956400"; d="scan'208";a="262573735" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jul 2022 19:00:41 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.92,238,1650956400"; d="scan'208";a="589518295" Received: from allen-box.sh.intel.com ([10.239.159.48]) by orsmga007.jf.intel.com with ESMTP; 01 Jul 2022 19:00:39 -0700 From: Lu Baolu To: Joerg Roedel , Steve Wahl , Kevin Tian Cc: David Woodhouse , Jerry Snitselaar , Mike Travis , Dimitri Sivanich , Russ Anderson , iommu@lists.linux.dev, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH v2 2/6] iommu/vt-d: Use IDA interface to manage iommu sequence id Date: Sat, 2 Jul 2022 09:56:06 +0800 Message-Id: <20220702015610.2849494-3-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220702015610.2849494-1-baolu.lu@linux.intel.com> References: <20220702015610.2849494-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Switch dmar unit sequence id allocation and release from bitmap to IDA interface. Signed-off-by: Lu Baolu --- drivers/iommu/intel/dmar.c | 35 ++++++++--------------------------- 1 file changed, 8 insertions(+), 27 deletions(-) diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c index 2a5e0f91e647..6327b34f5aa7 100644 --- a/drivers/iommu/intel/dmar.c +++ b/drivers/iommu/intel/dmar.c @@ -60,7 +60,7 @@ LIST_HEAD(dmar_drhd_units); struct acpi_table_header * __initdata dmar_tbl; static int dmar_dev_scope_status = 1; -static unsigned long dmar_seq_ids[BITS_TO_LONGS(DMAR_UNITS_SUPPORTED)]; +static DEFINE_IDA(dmar_seq_ids); static int alloc_iommu(struct dmar_drhd_unit *drhd); static void free_iommu(struct intel_iommu *iommu); @@ -1023,28 +1023,6 @@ static int map_iommu(struct intel_iommu *iommu, u64 phys_addr) return err; } -static int dmar_alloc_seq_id(struct intel_iommu *iommu) -{ - iommu->seq_id = find_first_zero_bit(dmar_seq_ids, - DMAR_UNITS_SUPPORTED); - if (iommu->seq_id >= DMAR_UNITS_SUPPORTED) { - iommu->seq_id = -1; - } else { - set_bit(iommu->seq_id, dmar_seq_ids); - sprintf(iommu->name, "dmar%d", iommu->seq_id); - } - - return iommu->seq_id; -} - -static void dmar_free_seq_id(struct intel_iommu *iommu) -{ - if (iommu->seq_id >= 0) { - clear_bit(iommu->seq_id, dmar_seq_ids); - iommu->seq_id = -1; - } -} - static int alloc_iommu(struct dmar_drhd_unit *drhd) { struct intel_iommu *iommu; @@ -1062,11 +1040,14 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd) if (!iommu) return -ENOMEM; - if (dmar_alloc_seq_id(iommu) < 0) { + iommu->seq_id = ida_alloc_range(&dmar_seq_ids, 0, + DMAR_UNITS_SUPPORTED - 1, GFP_KERNEL); + if (iommu->seq_id < 0) { pr_err("Failed to allocate seq_id\n"); - err = -ENOSPC; + err = iommu->seq_id; goto error; } + sprintf(iommu->name, "dmar%d", iommu->seq_id); err = map_iommu(iommu, drhd->reg_base_addr); if (err) { @@ -1150,7 +1131,7 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd) err_unmap: unmap_iommu(iommu); error_free_seq_id: - dmar_free_seq_id(iommu); + ida_free(&dmar_seq_ids, iommu->seq_id); error: kfree(iommu); return err; @@ -1183,7 +1164,7 @@ static void free_iommu(struct intel_iommu *iommu) if (iommu->reg) unmap_iommu(iommu); - dmar_free_seq_id(iommu); + ida_free(&dmar_seq_ids, iommu->seq_id); kfree(iommu); } -- 2.25.1