From patchwork Tue Apr 14 17:02:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Philippe Brucker X-Patchwork-Id: 11488725 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 41A9014DD for ; Tue, 14 Apr 2020 17:04:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A64B2075E for ; Tue, 14 Apr 2020 17:04:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="s8kwev4q" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728549AbgDNRE3 (ORCPT ); Tue, 14 Apr 2020 13:04:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34552 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S2391162AbgDNREZ (ORCPT ); Tue, 14 Apr 2020 13:04:25 -0400 Received: from mail-wm1-x344.google.com (mail-wm1-x344.google.com [IPv6:2a00:1450:4864:20::344]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A9263C061A10 for ; Tue, 14 Apr 2020 10:04:24 -0700 (PDT) Received: by mail-wm1-x344.google.com with SMTP id d77so13808089wmd.3 for ; Tue, 14 Apr 2020 10:04:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=VGMc5wLgmgx1eLWq9RQ7RG7NMxWRw2tpIDY5WHUtd3w=; b=s8kwev4qB+FwMlvJnZIEgUlpsfPv5PqQmyfezwvPiaaBckIACLW3XMkbvKRq6DnKDi t2UKqeUTPQYcigtkMp+zlJsyJsWC29+hzyF/YILdw1kem5LX+rUdahvgddngTIewGKPI Ls9qOOWbX1+GZLw2eHVDQ0C+3Q+XuIo7i0CpC5yzUkrPvbUvTws6yMxrz4kHGk4gH7S2 lLF7B3VkEZoHfACdrS90vN31rEj3/80zND2C7VWgfzHYgNywd5gdWfI831crvwFJA6Fr T0J9K0/WC/Dm3PeoZXFwuI8vTy1x6RYRQz3w1oY7B7IC5RAT8PsArjVC3oEpvuMEqYG7 NofQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=VGMc5wLgmgx1eLWq9RQ7RG7NMxWRw2tpIDY5WHUtd3w=; b=aJ1sVZDN8VFWWkbytwOZXREtPoHT3cKrMLU5e7jhnWmcsKy5Azs9iZ2zq60Ysomw1e ZSrMaZmTMcTc/xuEC1hEGi39Jo1tkjHoTMlNvpnCnQZCK3SpMksoMuXr3lcxpHKPGZco B4OFliGZtHolYQkvynoxdqZTaz2HL3SeTYmsQ5iz4Xw27mSg/QQoRGF34ou23g85u4bF rBuMoHHtD2Ojf1zf12mC8g+wFT9OqbFgX+2nPoR+gIXuDyPldsOEgwFBUSAnpfiP7AJM QsVWdWPtz81PibPaMQ8Zs4G1mwJ4OO4VxytvBqUEdcbbQi2NO1DlYz1PyB1htB6kBR63 kIOg== X-Gm-Message-State: AGi0Pub2XHr8LoqLitXuDHkUefYc3xyJ4zHShOThvZpE239ZPRtmScCV TAKXL7RO80mX7L4e8OaTueu3Bg== X-Google-Smtp-Source: APiQypL42n0W5SIMAbcNDaJARHcsQO61MSaD9RMrsbqmlsVv6uHGjdhQFjv16aEzCb2QZXgo0ox3nw== X-Received: by 2002:a1c:e906:: with SMTP id q6mr775518wmc.62.1586883863302; Tue, 14 Apr 2020 10:04:23 -0700 (PDT) Received: from localhost.localdomain ([2001:171b:226b:54a0:116c:c27a:3e7f:5eaf]) by smtp.gmail.com with ESMTPSA id x18sm19549147wrs.11.2020.04.14.10.04.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Apr 2020 10:04:22 -0700 (PDT) From: Jean-Philippe Brucker To: iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-mm@kvack.org Cc: joro@8bytes.org, catalin.marinas@arm.com, will@kernel.org, robin.murphy@arm.com, kevin.tian@intel.com, baolu.lu@linux.intel.com, Jonathan.Cameron@huawei.com, jacob.jun.pan@linux.intel.com, christian.koenig@amd.com, zhangfei.gao@linaro.org, jgg@ziepe.ca, xuzaibo@huawei.com, Jean-Philippe Brucker Subject: [PATCH v5 04/25] iommu/sva: Search mm by PASID Date: Tue, 14 Apr 2020 19:02:32 +0200 Message-Id: <20200414170252.714402-5-jean-philippe@linaro.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200414170252.714402-1-jean-philippe@linaro.org> References: <20200414170252.714402-1-jean-philippe@linaro.org> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The fault handler will need to find an mm given its PASID. This is the reason we have an IDR for storing address spaces, so hook it up. Signed-off-by: Jean-Philippe Brucker --- include/linux/iommu.h | 9 +++++++++ drivers/iommu/iommu-sva.c | 19 +++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 5a3d092c2568a..4b9c25d7246d5 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -1081,6 +1081,15 @@ void iommu_debugfs_setup(void); static inline void iommu_debugfs_setup(void) {} #endif +#ifdef CONFIG_IOMMU_SVA +extern struct mm_struct *iommu_sva_find(int pasid); +#else /* !CONFIG_IOMMU_SVA */ +static inline struct mm_struct *iommu_sva_find(int pasid) +{ + return NULL; +} +#endif /* !CONFIG_IOMMU_SVA */ + #ifdef CONFIG_IOMMU_PAGE_FAULT extern int iommu_queue_iopf(struct iommu_fault *fault, void *cookie); diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c index 7fecc74a9f7d6..b177d6cbf4fff 100644 --- a/drivers/iommu/iommu-sva.c +++ b/drivers/iommu/iommu-sva.c @@ -525,3 +525,22 @@ int iommu_sva_get_pasid_generic(struct iommu_sva *handle) return bond->io_mm->pasid; } EXPORT_SYMBOL_GPL(iommu_sva_get_pasid_generic); + +/* ioasid wants a void * argument */ +static bool __mmget_not_zero(void *mm) +{ + return mmget_not_zero(mm); +} + +/** + * iommu_sva_find() - Find mm associated to the given PASID + * @pasid: Process Address Space ID assigned to the mm + * + * Returns the mm corresponding to this PASID, or an error if not found. A + * reference to the mm is taken, and must be released with mmput(). + */ +struct mm_struct *iommu_sva_find(int pasid) +{ + return ioasid_find(&shared_pasid, pasid, __mmget_not_zero); +} +EXPORT_SYMBOL_GPL(iommu_sva_find);