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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C9718C2D0E6 for ; Wed, 25 Mar 2020 17:50:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B1BF62077D for ; Wed, 25 Mar 2020 17:50:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728095AbgCYRuE (ORCPT ); Wed, 25 Mar 2020 13:50:04 -0400 Received: from mga12.intel.com ([192.55.52.136]:57497 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728078AbgCYRtu (ORCPT ); Wed, 25 Mar 2020 13:49:50 -0400 IronPort-SDR: PtnMxi2P0rxLgT6FNdDh6ehoTXVLl0KuSZPkNNRK7hq+jal0Ew8MVBuFL3AIgRvf5VTHvoqcu2 wKS15T6eDwiQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Mar 2020 10:49:49 -0700 IronPort-SDR: qKTvv5GSnA5h7dqv9DnrGdJZqJU8gD7hexGiDDXFQy5yYIbC1AU2gRqGWsrAJcoHVEJFEkb3MK ICEdMvGeLV8Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.72,305,1580803200"; d="scan'208";a="393702216" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga004.jf.intel.com with ESMTP; 25 Mar 2020 10:49:48 -0700 From: Jacob Pan To: Joerg Roedel , Alex Williamson , "Lu Baolu" , iommu@lists.linux-foundation.org, LKML , David Woodhouse , Jean-Philippe Brucker Cc: "Yi Liu" , "Tian, Kevin" , Raj Ashok , "Christoph Hellwig" , Jonathan Cameron , Eric Auger , Jacob Pan Subject: [PATCH 09/10] iommu/ioasid: Support ioasid_set quota adjustment Date: Wed, 25 Mar 2020 10:55:30 -0700 Message-Id: <1585158931-1825-10-git-send-email-jacob.jun.pan@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1585158931-1825-1-git-send-email-jacob.jun.pan@linux.intel.com> References: <1585158931-1825-1-git-send-email-jacob.jun.pan@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org IOASID set is allocated with an initial quota, at runtime there may be needs to balance IOASID resources among different VMs/sets. This patch adds a new API to adjust per set quota. Signed-off-by: Jacob Pan --- drivers/iommu/ioasid.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/ioasid.h | 6 ++++++ 2 files changed, 50 insertions(+) diff --git a/drivers/iommu/ioasid.c b/drivers/iommu/ioasid.c index 27dce2cb5af2..5ac28862a1db 100644 --- a/drivers/iommu/ioasid.c +++ b/drivers/iommu/ioasid.c @@ -578,6 +578,50 @@ void ioasid_free_set(int sid, bool destroy_set) } EXPORT_SYMBOL_GPL(ioasid_free_set); +/** + * ioasid_adjust_set - Adjust the quota of an IOASID set + * @quota: Quota allowed in this set + * @sid: IOASID set ID to be assigned + * + * Return 0 on success. If the new quota is smaller than the number of + * IOASIDs already allocated, -EINVAL will be returned. No change will be + * made to the existing quota. + */ +int ioasid_adjust_set(int sid, int quota) +{ + struct ioasid_set_data *sdata; + int ret = 0; + + mutex_lock(&ioasid_allocator_lock); + sdata = xa_load(&ioasid_sets, sid); + if (!sdata || sdata->nr_ioasids > quota) { + pr_err("Failed to adjust IOASID set %d quota %d\n", + sid, quota); + ret = -EINVAL; + goto done_unlock; + } + + if (quota >= ioasid_capacity_avail) { + ret = -ENOSPC; + goto done_unlock; + } + + /* Return the delta back to system pool */ + ioasid_capacity_avail += sdata->size - quota; + + /* + * May have a policy to prevent giving all available IOASIDs + * to one set. But we don't enforce here, it should be in the + * upper layers. + */ + sdata->size = quota; + +done_unlock: + mutex_unlock(&ioasid_allocator_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(ioasid_adjust_set); /** * ioasid_find - Find IOASID data diff --git a/include/linux/ioasid.h b/include/linux/ioasid.h index 32d032913828..6e7de6fb91bf 100644 --- a/include/linux/ioasid.h +++ b/include/linux/ioasid.h @@ -73,6 +73,7 @@ int ioasid_alloc_set(struct ioasid_set *token, ioasid_t quota, int *sid); void ioasid_free_set(int sid, bool destroy_set); int ioasid_find_sid(ioasid_t ioasid); int ioasid_notify(ioasid_t id, enum ioasid_notify_val cmd); +int ioasid_adjust_set(int sid, int quota); #else /* !CONFIG_IOASID */ static inline ioasid_t ioasid_alloc(int sid, ioasid_t min, @@ -136,5 +137,10 @@ static inline int ioasid_alloc_system_set(int quota) return -ENOTSUPP; } +static inline int ioasid_adjust_set(int sid, int quota) +{ + return -ENOTSUPP; +} + #endif /* CONFIG_IOASID */ #endif /* __LINUX_IOASID_H */ -- 2.7.4