From patchwork Sun Mar 6 05:32:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 12770561 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 2F2ACC433F5 for ; Sun, 6 Mar 2022 05:33:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232933AbiCFFeA (ORCPT ); Sun, 6 Mar 2022 00:34:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229481AbiCFFd7 (ORCPT ); Sun, 6 Mar 2022 00:33:59 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0950B3E5DF; Sat, 5 Mar 2022 21:33:06 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 62917B80DEE; Sun, 6 Mar 2022 05:33:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 89E4AC340EF; Sun, 6 Mar 2022 05:33:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1646544784; bh=JPrGfrBIfwoosLcMMvbL+zi9gIDR6vfO7x+qghhJuJA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ByezMtLM7pcFwWtRCMJjNb7r+tsYkR20cW5WDkFodbF3t/Og2PifK6FN2xWyvcW3Y +OPaUcWvx8G4lwaH/q4ZVGbc2LaF/6RMJHEJgMyidNDEAp43XVjwZwV+WB1h8jlsxv UrrZxY9Jsaddk3KqjRF1cX/7WaZbHHogXHVIb0luBogdEswsEnFgoD7Vd9KP2r37S+ s1QduZpoGTpn6FqxN2/QKmMkAujXwfnT9XJ6l7r8cXocklj+F32I9VbWXbekniYscU 82Ghr0Citc5HwkAIkUMCxbS/Aq5L97CsDRRbXgEwTI+P6U6wgzrv8snZPam5pKCgko g6KOgW0lQbfpw== From: Jarkko Sakkinen To: linux-mm@kvack.org Cc: Dave Hansen , Nathaniel McCallum , Reinette Chatre , Andrew Morton , linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, Jarkko Sakkinen , Florian Fainelli , Thomas Bogendoerfer , Matthew Auld , =?utf-8?q?Thomas_Hellstr=C3=B6m?= , Daniel Vetter , Jason Ekstrand , Chris Wilson , Maarten Lankhorst , Tvrtko Ursulin , Greg Kroah-Hartman , Shakeel Butt , Vasily Averin , zhangyiru , Alexander Mikhalitsyn , Alexey Gladkov , linux-mips@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, codalist@coda.cs.cmu.edu, linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH RFC 1/3] mm: Add f_ops->populate() Date: Sun, 6 Mar 2022 07:32:05 +0200 Message-Id: <20220306053211.135762-2-jarkko@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220306053211.135762-1-jarkko@kernel.org> References: <20220306053211.135762-1-jarkko@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org Sometimes you might want to use MAP_POPULATE to ask a device driver to initialize the device memory in some specific manner. SGX driver can use this to request more memory by issuing ENCLS[EAUG] x86 opcode for each page in the address range. Add f_ops->populate() with the same parameters as f_ops->mmap() and make it conditionally called inside call_mmap(). Update call sites accodingly. --- Signed-off-by: Jarkko Sakkinen v3: - if (!ret && do_populate && file->f_op->populate) + if (!ret && do_populate && file->f_op->populate && + !!(vma->vm_flags & (VM_IO | VM_PFNMAP))) (reported by Matthew Wilcox) v2: - if (!ret && do_populate) + if (!ret && do_populate && file->f_op->populate) (reported by Jan Harkes) --- arch/mips/kernel/vdso.c | 2 +- drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 2 +- fs/coda/file.c | 2 +- fs/overlayfs/file.c | 2 +- include/linux/fs.h | 12 ++++++++++-- include/linux/mm.h | 2 +- ipc/shm.c | 2 +- mm/mmap.c | 10 +++++----- mm/nommu.c | 4 ++-- 9 files changed, 23 insertions(+), 15 deletions(-) diff --git a/arch/mips/kernel/vdso.c b/arch/mips/kernel/vdso.c index 3d0cf471f2fe..89f3f3da9abd 100644 --- a/arch/mips/kernel/vdso.c +++ b/arch/mips/kernel/vdso.c @@ -102,7 +102,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) base = mmap_region(NULL, STACK_TOP, PAGE_SIZE, VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC, - 0, NULL); + 0, NULL, false); if (IS_ERR_VALUE(base)) { ret = base; goto out; diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c index 1b526039a60d..4c71f64d6a79 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c @@ -107,7 +107,7 @@ static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct * if (!obj->base.filp) return -ENODEV; - ret = call_mmap(obj->base.filp, vma); + ret = call_mmap(obj->base.filp, vma, false); if (ret) return ret; diff --git a/fs/coda/file.c b/fs/coda/file.c index 29dd87be2fb8..e14f312fdbf8 100644 --- a/fs/coda/file.c +++ b/fs/coda/file.c @@ -173,7 +173,7 @@ coda_file_mmap(struct file *coda_file, struct vm_area_struct *vma) spin_unlock(&cii->c_lock); vma->vm_file = get_file(host_file); - ret = call_mmap(vma->vm_file, vma); + ret = call_mmap(vma->vm_file, vma, false); if (ret) { /* if call_mmap fails, our caller will put host_file so we diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c index fa125feed0ff..b963a9397e80 100644 --- a/fs/overlayfs/file.c +++ b/fs/overlayfs/file.c @@ -503,7 +503,7 @@ static int ovl_mmap(struct file *file, struct vm_area_struct *vma) vma_set_file(vma, realfile); old_cred = ovl_override_creds(file_inode(file)->i_sb); - ret = call_mmap(vma->vm_file, vma); + ret = call_mmap(vma->vm_file, vma, false); revert_creds(old_cred); ovl_file_accessed(file); diff --git a/include/linux/fs.h b/include/linux/fs.h index e2d892b201b0..2909e2d14af8 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -42,6 +42,7 @@ #include #include #include +#include #include #include @@ -1993,6 +1994,7 @@ struct file_operations { long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); long (*compat_ioctl) (struct file *, unsigned int, unsigned long); int (*mmap) (struct file *, struct vm_area_struct *); + int (*populate)(struct file *, struct vm_area_struct *); unsigned long mmap_supported_flags; int (*open) (struct inode *, struct file *); int (*flush) (struct file *, fl_owner_t id); @@ -2074,9 +2076,15 @@ static inline ssize_t call_write_iter(struct file *file, struct kiocb *kio, return file->f_op->write_iter(kio, iter); } -static inline int call_mmap(struct file *file, struct vm_area_struct *vma) +static inline int call_mmap(struct file *file, struct vm_area_struct *vma, bool do_populate) { - return file->f_op->mmap(file, vma); + int ret = file->f_op->mmap(file, vma); + + if (!ret && do_populate && file->f_op->populate && + !!(vma->vm_flags & (VM_IO | VM_PFNMAP))) + ret = file->f_op->populate(file, vma); + + return ret; } extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); diff --git a/include/linux/mm.h b/include/linux/mm.h index 213cc569b192..6c8c036f423b 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2683,7 +2683,7 @@ extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned lo extern unsigned long mmap_region(struct file *file, unsigned long addr, unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, - struct list_head *uf); + struct list_head *uf, bool do_populate); extern unsigned long do_mmap(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long pgoff, unsigned long *populate, struct list_head *uf); diff --git a/ipc/shm.c b/ipc/shm.c index b3048ebd5c31..89b28f32acf0 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -587,7 +587,7 @@ static int shm_mmap(struct file *file, struct vm_area_struct *vma) if (ret) return ret; - ret = call_mmap(sfd->file, vma); + ret = call_mmap(sfd->file, vma, do_populate); if (ret) { shm_close(vma); return ret; diff --git a/mm/mmap.c b/mm/mmap.c index 1e8fdb0b51ed..5eca79957d4c 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1413,6 +1413,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr, unsigned long flags, unsigned long pgoff, unsigned long *populate, struct list_head *uf) { + bool do_populate = (flags & (MAP_POPULATE | MAP_NONBLOCK)) == MAP_POPULATE; struct mm_struct *mm = current->mm; vm_flags_t vm_flags; int pkey = 0; @@ -1579,10 +1580,9 @@ unsigned long do_mmap(struct file *file, unsigned long addr, vm_flags |= VM_NORESERVE; } - addr = mmap_region(file, addr, len, vm_flags, pgoff, uf); + addr = mmap_region(file, addr, len, vm_flags, pgoff, uf, do_populate); if (!IS_ERR_VALUE(addr) && - ((vm_flags & VM_LOCKED) || - (flags & (MAP_POPULATE | MAP_NONBLOCK)) == MAP_POPULATE)) + ((vm_flags & VM_LOCKED) || do_populate)) *populate = len; return addr; } @@ -1721,7 +1721,7 @@ static inline int accountable_mapping(struct file *file, vm_flags_t vm_flags) unsigned long mmap_region(struct file *file, unsigned long addr, unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, - struct list_head *uf) + struct list_head *uf, bool do_populate) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma, *prev, *merge; @@ -1790,7 +1790,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr, } vma->vm_file = get_file(file); - error = call_mmap(file, vma); + error = call_mmap(file, vma, do_populate); if (error) goto unmap_and_free_vma; diff --git a/mm/nommu.c b/mm/nommu.c index 55a9e48a7a02..a3c20b803c27 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -941,7 +941,7 @@ static int do_mmap_shared_file(struct vm_area_struct *vma) { int ret; - ret = call_mmap(vma->vm_file, vma); + ret = call_mmap(vma->vm_file, vma, false); if (ret == 0) { vma->vm_region->vm_top = vma->vm_region->vm_end; return 0; @@ -972,7 +972,7 @@ static int do_mmap_private(struct vm_area_struct *vma, * - VM_MAYSHARE will be set if it may attempt to share */ if (capabilities & NOMMU_MAP_DIRECT) { - ret = call_mmap(vma->vm_file, vma); + ret = call_mmap(vma->vm_file, vma, false); if (ret == 0) { /* shouldn't return success if we're not sharing */ BUG_ON(!(vma->vm_flags & VM_MAYSHARE));