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 40727C433EF for ; Tue, 7 Jun 2022 01:54:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235910AbiFGByo (ORCPT ); Mon, 6 Jun 2022 21:54:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38490 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235868AbiFGByT (ORCPT ); Mon, 6 Jun 2022 21:54:19 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7B6D26FD03 for ; Mon, 6 Jun 2022 18:54:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1654566855; x=1686102855; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ZhVJrH8ZIL7/etGs0byavRR7lBKr0I4+Mu5OuvDVjHU=; b=dXOCkGDysil5aDrQbtqhMiO4MBNVnnSexPa+voPVty265TCyuWqUBWOh Q3L553CxXNnF1D7aCDOrljDDLckaJBkMl1t8BytrG0O6wrVqpQ6rLJyv7 bi3rEHvDy2hQQpLcVUR5aLn5iRcb/kEjQKTzIajQvSv6eOW7qy3W/RF3c viZ9YCCT0g6htWclUT+XGQ7YsOANj064rGWobDDbedE1Gnw23q0VUg46t 0Xi1NznqoKGDxdtnLvVgNE/ayTCs5nKMosWdhIq3VLWufwz+ClUgCSqOE 0PJMLMvQ1ER9vwA9jfT2jI9sg3LXQJwNJIkOdIO8GWt6dmF/FS1UyU0qM Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10370"; a="302064150" X-IronPort-AV: E=Sophos;i="5.91,282,1647327600"; d="scan'208";a="302064150" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Jun 2022 18:54:15 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,282,1647327600"; d="scan'208";a="635886324" Received: from allen-box.sh.intel.com ([10.239.159.48]) by fmsmga008.fm.intel.com with ESMTP; 06 Jun 2022 18:54:11 -0700 From: Lu Baolu To: Joerg Roedel , Jason Gunthorpe , Christoph Hellwig , Kevin Tian , Ashok Raj , Will Deacon , Robin Murphy , Jean-Philippe Brucker , Dave Jiang , Vinod Koul Cc: Eric Auger , Liu Yi L , Jacob jun Pan , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Lu Baolu , Jean-Philippe Brucker Subject: [PATCH v8 10/11] iommu: Per-domain I/O page fault handling Date: Tue, 7 Jun 2022 09:49:41 +0800 Message-Id: <20220607014942.3954894-11-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220607014942.3954894-1-baolu.lu@linux.intel.com> References: <20220607014942.3954894-1-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 Tweak the I/O page fault handling framework to route the page faults to the domain and call the page fault handler retrieved from the domain. This makes the I/O page fault handling framework possible to serve more usage scenarios as long as they have an IOMMU domain and install a page fault handler in it. Some unused functions are also removed to avoid dead code. The iommu_get_domain_for_dev_pasid() which retrieves attached domain for a {device, PASID} pair is used. It will be used by the page fault handling framework which knows {device, PASID} reported from the iommu driver. We have a guarantee that the SVA domain doesn't go away during IOPF handling, because unbind() waits for pending faults with iopf_queue_flush_dev() before freeing the domain. Hence, there's no need to synchronize life cycle of the iommu domains between the unbind() and the interrupt threads. Signed-off-by: Lu Baolu Reviewed-by: Jean-Philippe Brucker --- drivers/iommu/io-pgfault.c | 64 +++++--------------------------------- 1 file changed, 7 insertions(+), 57 deletions(-) diff --git a/drivers/iommu/io-pgfault.c b/drivers/iommu/io-pgfault.c index aee9e033012f..4f24ec703479 100644 --- a/drivers/iommu/io-pgfault.c +++ b/drivers/iommu/io-pgfault.c @@ -69,69 +69,18 @@ static int iopf_complete_group(struct device *dev, struct iopf_fault *iopf, return iommu_page_response(dev, &resp); } -static enum iommu_page_response_code -iopf_handle_single(struct iopf_fault *iopf) -{ - vm_fault_t ret; - struct mm_struct *mm; - struct vm_area_struct *vma; - unsigned int access_flags = 0; - unsigned int fault_flags = FAULT_FLAG_REMOTE; - struct iommu_fault_page_request *prm = &iopf->fault.prm; - enum iommu_page_response_code status = IOMMU_PAGE_RESP_INVALID; - - if (!(prm->flags & IOMMU_FAULT_PAGE_REQUEST_PASID_VALID)) - return status; - - mm = iommu_sva_find(prm->pasid); - if (IS_ERR_OR_NULL(mm)) - return status; - - mmap_read_lock(mm); - - vma = find_extend_vma(mm, prm->addr); - if (!vma) - /* Unmapped area */ - goto out_put_mm; - - if (prm->perm & IOMMU_FAULT_PERM_READ) - access_flags |= VM_READ; - - if (prm->perm & IOMMU_FAULT_PERM_WRITE) { - access_flags |= VM_WRITE; - fault_flags |= FAULT_FLAG_WRITE; - } - - if (prm->perm & IOMMU_FAULT_PERM_EXEC) { - access_flags |= VM_EXEC; - fault_flags |= FAULT_FLAG_INSTRUCTION; - } - - if (!(prm->perm & IOMMU_FAULT_PERM_PRIV)) - fault_flags |= FAULT_FLAG_USER; - - if (access_flags & ~vma->vm_flags) - /* Access fault */ - goto out_put_mm; - - ret = handle_mm_fault(vma, prm->addr, fault_flags, NULL); - status = ret & VM_FAULT_ERROR ? IOMMU_PAGE_RESP_INVALID : - IOMMU_PAGE_RESP_SUCCESS; - -out_put_mm: - mmap_read_unlock(mm); - mmput(mm); - - return status; -} - static void iopf_handle_group(struct work_struct *work) { struct iopf_group *group; + struct iommu_domain *domain; struct iopf_fault *iopf, *next; enum iommu_page_response_code status = IOMMU_PAGE_RESP_SUCCESS; group = container_of(work, struct iopf_group, work); + domain = iommu_get_domain_for_dev_pasid(group->dev, + group->last_fault.fault.prm.pasid); + if (!domain || !domain->iopf_handler) + status = IOMMU_PAGE_RESP_INVALID; list_for_each_entry_safe(iopf, next, &group->faults, list) { /* @@ -139,7 +88,8 @@ static void iopf_handle_group(struct work_struct *work) * faults in the group if there is an error. */ if (status == IOMMU_PAGE_RESP_SUCCESS) - status = iopf_handle_single(iopf); + status = domain->iopf_handler(&iopf->fault, + domain->fault_data); if (!(iopf->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) -- 2.25.1