From patchwork Thu Dec 21 15:39:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13502306 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.93]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E051055E54; Thu, 21 Dec 2023 15:39:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="RoufmXi8" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1703173196; x=1734709196; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=2K+3oxZajPraUVN7JvkrWuHOXQ1B60y8EHJmVtjdI44=; b=RoufmXi8lcO7NaG/gEGlFWq8VJ5M0lRpudZLIAm5vey8DLGAyBvMuiru 2nuJHJMyl/+R7NchKk6EXQS+JhzY975KcFrXVqDn+SRbZw0C5Bmqgef0i A6OI9zJRodSUo1dk4I42z8mLm2hCJuMCWnLjQixu86Ae71wucEOqf0/lM pZKkJPTSyK4QqYZJbTU12f4RrU+t2bTDZLedDeNLmFjbQ1vVs/Pat+/2a /sLdFq1zvkPHUAQPQB3axhM/LBA7RYklYG57pzNdhOBRJvbbifLYAAIgv FUWyf9kbCALz9RhAEkaIjhBO9acP44b5NaZf7TYzwgojVQSdfcw+wUXfH A==; X-IronPort-AV: E=McAfee;i="6600,9927,10931"; a="393155516" X-IronPort-AV: E=Sophos;i="6.04,293,1695711600"; d="scan'208";a="393155516" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Dec 2023 07:39:53 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10931"; a="949957244" X-IronPort-AV: E=Sophos;i="6.04,293,1695711600"; d="scan'208";a="949957244" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by orsmga005.jf.intel.com with ESMTP; 21 Dec 2023 07:39:52 -0800 From: Yi Liu To: joro@8bytes.org, alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com, robin.murphy@arm.com, baolu.lu@linux.intel.com Cc: cohuck@redhat.com, eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org, mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com, yi.l.liu@intel.com, yi.y.sun@linux.intel.com, peterx@redhat.com, jasowang@redhat.com, shameerali.kolothum.thodi@huawei.com, lulu@redhat.com, suravee.suthikulpanit@amd.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, zhenzhong.duan@intel.com, joao.m.martins@oracle.com, xin.zeng@intel.com, yan.y.zhao@intel.com, j.granados@samsung.com Subject: [PATCH v7 3/9] iommu: Add iommu_copy_struct_from_user_array helper Date: Thu, 21 Dec 2023 07:39:42 -0800 Message-Id: <20231221153948.119007-4-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231221153948.119007-1-yi.l.liu@intel.com> References: <20231221153948.119007-1-yi.l.liu@intel.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Nicolin Chen Wrap up the data pointer/num sanity and __iommu_copy_struct_from_user call for iommu drivers to copy driver specific data at a specific location in the struct iommu_user_data_array, and iommu_respond_struct_to_user_array() to copy response to a specific location in the struct iommu_user_data_array. And expect it to be used in cache_invalidate_user ops for example. Signed-off-by: Nicolin Chen Co-developed-by: Yi Liu Signed-off-by: Yi Liu Reviewed-by: Kevin Tian --- include/linux/iommu.h | 74 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 5c4a17f13761..cfab934e71a2 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -342,6 +342,80 @@ static inline int __iommu_copy_struct_from_user( sizeof(*kdst), \ offsetofend(typeof(*kdst), min_last)) +/** + * __iommu_copy_struct_from_user_array - Copy iommu driver specific user space + * data from an iommu_user_data_array + * @dst_data: Pointer to an iommu driver specific user data that is defined in + * include/uapi/linux/iommufd.h + * @src_array: Pointer to a struct iommu_user_data_array for a user space array + * @data_type: The data type of the @dst_data. Must match with @src_array.type + * @index: Index to the location in the array to copy user data from + * @data_len: Length of current user data structure, i.e. sizeof(struct _dst) + * @min_len: Initial length of user data structure for backward compatibility. + * This should be offsetofend using the last member in the user data + * struct that was initially added to include/uapi/linux/iommufd.h + */ +static inline int +__iommu_copy_struct_from_user_array(void *dst_data, + const struct iommu_user_data_array *src_array, + unsigned int data_type, unsigned int index, + size_t data_len, size_t min_len) +{ + struct iommu_user_data src_data; + + if (WARN_ON(!src_array || index >= src_array->entry_num)) + return -EINVAL; + if (!src_array->entry_num) + return -EINVAL; + src_data.uptr = src_array->uptr + src_array->entry_len * index; + src_data.len = src_array->entry_len; + src_data.type = src_array->type; + + return __iommu_copy_struct_from_user(dst_data, &src_data, data_type, + data_len, min_len); +} + +/** + * iommu_copy_struct_from_user_array - Copy iommu driver specific user space + * data from an iommu_user_data_array + * @kdst: Pointer to an iommu driver specific user data that is defined in + * include/uapi/linux/iommufd.h + * @user_array: Pointer to a struct iommu_user_data_array for a user space + * array + * @data_type: The data type of the @kdst. Must match with @user_array->type + * @index: Index to the location in the array to copy user data from + * @min_last: The last memember of the data structure @kdst points in the + * initial version. + * Return 0 for success, otherwise -error. + */ +#define iommu_copy_struct_from_user_array(kdst, user_array, data_type, \ + index, min_last) \ + __iommu_copy_struct_from_user_array(kdst, user_array, data_type, \ + index, sizeof(*kdst), \ + offsetofend(typeof(*kdst), \ + min_last)) + +/** + * iommu_respond_struct_to_user_array - Copy the response in @ksrc back to + * a specific entry of user array + * @user_array: Pointer to a struct iommu_user_data_array for a user space + * array + * @index: Index to the location in the array to copy response + * @ksrc: Pointer to kernel structure + * @klen: Length of @ksrc struct + * + * This only copies response of one entry (@index) in @user_array. + */ +static inline int +iommu_respond_struct_to_user_array(const struct iommu_user_data_array *array, + unsigned int index, void *ksrc, size_t klen) +{ + if (copy_to_user(array->uptr + array->entry_len * index, + ksrc, min_t(size_t, array->entry_len, klen))) + return -EFAULT; + return 0; +} + /** * struct iommu_ops - iommu ops and capabilities * @capable: check capability