From nobody Sun Apr 12 02:53:31 2026 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 40B7BC19F2B for ; Mon, 1 Aug 2022 17:04:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232771AbiHAREh (ORCPT ); Mon, 1 Aug 2022 13:04:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52544 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232156AbiHAREc (ORCPT ); Mon, 1 Aug 2022 13:04:32 -0400 Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5B9393336D; Mon, 1 Aug 2022 10:04:31 -0700 (PDT) Received: by mail-pl1-x634.google.com with SMTP id w10so11065337plq.0; Mon, 01 Aug 2022 10:04:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc; bh=TkCavpnUSJ7vycAkcy6P7E6qdN3Z1ej/wDjztPEV1Xs=; b=mcZ6MXoEnw1JToD2hyRhIZ7pGnefjHTTti+cjwuy9wEhPI6rOCmXGKRxCCyNgpQVGQ 8ESBynZewyeP+SZ1jLeB8wARO2Qg6Ez0lCcZ4hW5Ad8Ij6Gv9RiSk4lnu4tQPos6Vs8t Wvq0L05TVB+4rbq4F2Qbli+EVXlKvq50rJMQBYzqGnXZ4V7U37sqyIGaTCR+TY+fWwKF OOkDDbKQsUeSAysdawliNu53PRsS1Ms5xw86ZQOU9y+IdzyNh61KweuH7ZDuCKbTwsxq HD4OvuUg7ZP692EA+mU+yv7FDvEb1AXFoMHE+NNT9MVfirvSgmZL52BvG/lfo29jqZoD uHkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc; bh=TkCavpnUSJ7vycAkcy6P7E6qdN3Z1ej/wDjztPEV1Xs=; b=5V9KOejNftjF02X6AyPWYfFXr2q47bCy2Rf4zHxq5DaJxAc9/EYMiZnhWzDGdC4zx9 Vrscv6THvK138YETVwlsXaiCzaElmRplwOmVmPVEm/Xu3hF9RN4hc+dmdS3TFOO96haK e05tEA2yWRmP7Ej9osrbdusoItnj2s7XFHNDjyS4dYV/l/jZG/hMWmJvUyLkQHwlbLHF a8SQFByAnE0+6a/FgxIv2X0tsetKv5iylqpEkIo40h3mZTuSdi+5XuZcwqZbKsFoIWvK YqMjjkcBTOdOsKLr7yaH316G8dcTj5Vgmhi9I0dknYolNfA7kWquMAFlF7Mu6qAHPI7F c1pg== X-Gm-Message-State: ACgBeo2Sqii70qw3+0C3rWNVrnz8CV9TrR0Qlt8MG3/h4MrgHMKPyPKe 3FvcbOtOh+GX+mRs2a/wSOq9ZlIeoXI= X-Google-Smtp-Source: AA6agR52MvgLOLsM9cuZ5dMaC0PMt05gnbIz5aCroJo5wVmxWfOtz0BXNBd1TvyuExGOeaD5YCdI6Q== X-Received: by 2002:a17:903:22cb:b0:16e:e31f:5197 with SMTP id y11-20020a17090322cb00b0016ee31f5197mr7430704plg.23.1659373470488; Mon, 01 Aug 2022 10:04:30 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:4a00:2703:3c72:eb1a:cffd]) by smtp.gmail.com with ESMTPSA id f13-20020a170902ce8d00b0016d5626af4fsm10105279plg.21.2022.08.01.10.04.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Aug 2022 10:04:29 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: freedreno@lists.freedesktop.org, Rob Clark , Sumit Semwal , =?UTF-8?q?Christian=20K=C3=B6nig?= , =?UTF-8?q?J=C3=A9r=C3=B4me=20Pouiller?= , linux-media@vger.kernel.org (open list:DMA BUFFER SHARING FRAMEWORK), linaro-mm-sig@lists.linaro.org (moderated list:DMA BUFFER SHARING FRAMEWORK), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v2 1/3] dma-buf: Add ioctl to query mmap info Date: Mon, 1 Aug 2022 10:04:55 -0700 Message-Id: <20220801170459.1593706-2-robdclark@gmail.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220801170459.1593706-1-robdclark@gmail.com> References: <20220801170459.1593706-1-robdclark@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Rob Clark This is a fairly narrowly focused interface, providing a way for a VMM in userspace to tell the guest kernel what pgprot settings to use when mapping a buffer to guest userspace. For buffers that get mapped into guest userspace, virglrenderer returns a dma-buf fd to the VMM (crosvm or qemu). In addition to mapping the pages into the guest VM, it needs to report to drm/virtio in the guest the cache settings to use for guest userspace. In particular, on some architectures, creating aliased mappings with different cache attributes is frowned upon, so it is important that the guest mappings have the same cache attributes as any potential host mappings. Signed-off-by: Rob Clark --- v2. fix compiler warning drivers/dma-buf/dma-buf.c | 26 ++++++++++++++++++++++++++ include/linux/dma-buf.h | 7 +++++++ include/uapi/linux/dma-buf.h | 28 ++++++++++++++++++++++++++++ 3 files changed, 61 insertions(+) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 32f55640890c..87c52f080274 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -326,6 +326,29 @@ static long dma_buf_set_name(struct dma_buf *dmabuf, c= onst char __user *buf) return 0; } =20 +static long dma_buf_info(struct dma_buf *dmabuf, void __user *uarg) +{ + struct dma_buf_info arg; + + if (copy_from_user(&arg, uarg, sizeof(arg))) + return -EFAULT; + + switch (arg.param) { + case DMA_BUF_INFO_VM_PROT: + if (!dmabuf->ops->mmap_info) + return -ENOSYS; + arg.value =3D dmabuf->ops->mmap_info(dmabuf); + break; + default: + return -EINVAL; + } + + if (copy_to_user(uarg, &arg, sizeof(arg))) + return -EFAULT; + + return 0; +} + static long dma_buf_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { @@ -369,6 +392,9 @@ static long dma_buf_ioctl(struct file *file, case DMA_BUF_SET_NAME_B: return dma_buf_set_name(dmabuf, (const char __user *)arg); =20 + case DMA_BUF_IOCTL_INFO: + return dma_buf_info(dmabuf, (void __user *)arg); + default: return -ENOTTY; } diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 71731796c8c3..6f4de64a5937 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -283,6 +283,13 @@ struct dma_buf_ops { */ int (*mmap)(struct dma_buf *, struct vm_area_struct *vma); =20 + /** + * @mmap_info: + * + * Return mmapping info for the buffer. See DMA_BUF_INFO_VM_PROT. + */ + int (*mmap_info)(struct dma_buf *); + int (*vmap)(struct dma_buf *dmabuf, struct iosys_map *map); void (*vunmap)(struct dma_buf *dmabuf, struct iosys_map *map); }; diff --git a/include/uapi/linux/dma-buf.h b/include/uapi/linux/dma-buf.h index b1523cb8ab30..a41adac0f46a 100644 --- a/include/uapi/linux/dma-buf.h +++ b/include/uapi/linux/dma-buf.h @@ -85,6 +85,32 @@ struct dma_buf_sync { =20 #define DMA_BUF_NAME_LEN 32 =20 + +/** + * struct dma_buf_info - Query info about the buffer. + */ +struct dma_buf_info { + +#define DMA_BUF_INFO_VM_PROT 1 +# define DMA_BUF_VM_PROT_WC 0 +# define DMA_BUF_VM_PROT_CACHED 1 + + /** + * @param: Which param to query + * + * DMA_BUF_INFO_BM_PROT: + * Query the access permissions of userspace mmap's of this buffer. + * Returns one of DMA_BUF_VM_PROT_x + */ + __u32 param; + __u32 pad; + + /** + * @value: Return value of the query. + */ + __u64 value; +}; + #define DMA_BUF_BASE 'b' #define DMA_BUF_IOCTL_SYNC _IOW(DMA_BUF_BASE, 0, struct dma_buf_sync) =20 @@ -95,4 +121,6 @@ struct dma_buf_sync { #define DMA_BUF_SET_NAME_A _IOW(DMA_BUF_BASE, 1, __u32) #define DMA_BUF_SET_NAME_B _IOW(DMA_BUF_BASE, 1, __u64) =20 +#define DMA_BUF_IOCTL_INFO _IOWR(DMA_BUF_BASE, 2, struct dma_buf_info) + #endif --=20 2.36.1 From nobody Sun Apr 12 02:53:31 2026 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 8A6CBC00144 for ; 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Mon, 01 Aug 2022 10:04:32 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: freedreno@lists.freedesktop.org, Rob Clark , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Sumit Semwal , =?UTF-8?q?Christian=20K=C3=B6nig?= , linux-kernel@vger.kernel.org (open list), linux-media@vger.kernel.org (open list:DMA BUFFER SHARING FRAMEWORK), linaro-mm-sig@lists.linaro.org (moderated list:DMA BUFFER SHARING FRAMEWORK) Subject: [PATCH v2 2/3] drm/prime: Wire up mmap_info support Date: Mon, 1 Aug 2022 10:04:56 -0700 Message-Id: <20220801170459.1593706-3-robdclark@gmail.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220801170459.1593706-1-robdclark@gmail.com> References: <20220801170459.1593706-1-robdclark@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Rob Clark Just plumbing the thing thru an extra layer. Signed-off-by: Rob Clark --- drivers/gpu/drm/drm_prime.c | 12 ++++++++++++ include/drm/drm_drv.h | 7 +++++++ 2 files changed, 19 insertions(+) diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index e3f09f18110c..f58586e131c5 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -784,6 +784,17 @@ int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struc= t vm_area_struct *vma) } EXPORT_SYMBOL(drm_gem_dmabuf_mmap); =20 +static int drm_gem_dmabuf_mmap_info(struct dma_buf *dma_buf) +{ + struct drm_gem_object *obj =3D dma_buf->priv; + struct drm_device *dev =3D obj->dev; + + if (!dev->driver->gem_prime_mmap_info) + return -ENOSYS; + + return dev->driver->gem_prime_mmap_info(obj); +} + static const struct dma_buf_ops drm_gem_prime_dmabuf_ops =3D { .cache_sgt_mapping =3D true, .attach =3D drm_gem_map_attach, @@ -792,6 +803,7 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_op= s =3D { .unmap_dma_buf =3D drm_gem_unmap_dma_buf, .release =3D drm_gem_dmabuf_release, .mmap =3D drm_gem_dmabuf_mmap, + .mmap_info =3D drm_gem_dmabuf_mmap_info, .vmap =3D drm_gem_dmabuf_vmap, .vunmap =3D drm_gem_dmabuf_vunmap, }; diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h index f6159acb8856..797c0f8c2dd0 100644 --- a/include/drm/drm_drv.h +++ b/include/drm/drm_drv.h @@ -355,6 +355,13 @@ struct drm_driver { */ int (*gem_prime_mmap)(struct drm_gem_object *obj, struct vm_area_struct *= vma); =20 + /** + * @gem_prim_mmap_info: + * + * Get info about mmap setup by gem_prime_mmap. See dma_buf_ops:mmap_inf= o. + */ + int (*gem_prime_mmap_info)(struct drm_gem_object *obj); + /** * @dumb_create: * --=20 2.36.1 From nobody Sun Apr 12 02:53:31 2026 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 68C36C00144 for ; Mon, 1 Aug 2022 17:04:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233232AbiHAREs (ORCPT ); Mon, 1 Aug 2022 13:04:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52740 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232361AbiHAREj (ORCPT ); Mon, 1 Aug 2022 13:04:39 -0400 Received: from mail-pf1-x431.google.com (mail-pf1-x431.google.com [IPv6:2607:f8b0:4864:20::431]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6904539B8B; Mon, 1 Aug 2022 10:04:37 -0700 (PDT) Received: by mail-pf1-x431.google.com with SMTP id z187so1269514pfb.12; 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Mon, 01 Aug 2022 10:04:36 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:4a00:2703:3c72:eb1a:cffd]) by smtp.gmail.com with ESMTPSA id o8-20020a17090a9f8800b001f2ef2f9c6fsm9041018pjp.56.2022.08.01.10.04.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Aug 2022 10:04:35 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: freedreno@lists.freedesktop.org, Rob Clark , Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , David Airlie , Daniel Vetter , linux-arm-msm@vger.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v2 3/3] drm/msm/prime: Add mmap_info support Date: Mon, 1 Aug 2022 10:04:57 -0700 Message-Id: <20220801170459.1593706-4-robdclark@gmail.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220801170459.1593706-1-robdclark@gmail.com> References: <20220801170459.1593706-1-robdclark@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Rob Clark Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/msm_drv.c | 1 + drivers/gpu/drm/msm/msm_drv.h | 1 + drivers/gpu/drm/msm/msm_gem_prime.c | 11 +++++++++++ 3 files changed, 13 insertions(+) diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index 1ca4a92ba96e..4979aa8187ec 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -1044,6 +1044,7 @@ static const struct drm_driver msm_driver =3D { .prime_fd_to_handle =3D drm_gem_prime_fd_to_handle, .gem_prime_import_sg_table =3D msm_gem_prime_import_sg_table, .gem_prime_mmap =3D msm_gem_prime_mmap, + .gem_prime_mmap_info=3D msm_gem_prime_mmap_info, #ifdef CONFIG_DEBUG_FS .debugfs_init =3D msm_debugfs_init, #endif diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h index 7330d7b5de8e..b4ace34ec889 100644 --- a/drivers/gpu/drm/msm/msm_drv.h +++ b/drivers/gpu/drm/msm/msm_drv.h @@ -271,6 +271,7 @@ void msm_gem_shrinker_init(struct drm_device *dev); void msm_gem_shrinker_cleanup(struct drm_device *dev); =20 int msm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *= vma); +int msm_gem_prime_mmap_info(struct drm_gem_object *obj); struct sg_table *msm_gem_prime_get_sg_table(struct drm_gem_object *obj); int msm_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map); void msm_gem_prime_vunmap(struct drm_gem_object *obj, struct iosys_map *ma= p); diff --git a/drivers/gpu/drm/msm/msm_gem_prime.c b/drivers/gpu/drm/msm/msm_= gem_prime.c index c1d91863df05..2bacab7a1921 100644 --- a/drivers/gpu/drm/msm/msm_gem_prime.c +++ b/drivers/gpu/drm/msm/msm_gem_prime.c @@ -5,6 +5,7 @@ */ =20 #include +#include =20 #include =20 @@ -26,6 +27,16 @@ int msm_gem_prime_mmap(struct drm_gem_object *obj, struc= t vm_area_struct *vma) return drm_gem_prime_mmap(obj, vma); } =20 +int msm_gem_prime_mmap_info(struct drm_gem_object *obj) +{ + struct msm_gem_object *msm_obj =3D to_msm_bo(obj); + + if (msm_obj->flags & MSM_BO_WC) + return DMA_BUF_VM_PROT_WC; + + return DMA_BUF_VM_PROT_CACHED; +} + struct sg_table *msm_gem_prime_get_sg_table(struct drm_gem_object *obj) { struct msm_gem_object *msm_obj =3D to_msm_bo(obj); --=20 2.36.1