From patchwork Mon Oct 17 17:22:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 13009089 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 21F38C433FE for ; Mon, 17 Oct 2022 17:24:33 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A64A010E570; Mon, 17 Oct 2022 17:24:22 +0000 (UTC) Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by gabe.freedesktop.org (Postfix) with ESMTPS id BAB4510E3AE; Mon, 17 Oct 2022 17:24:17 +0000 (UTC) Received: from dimapc.. (109-252-119-114.nat.spd-mgts.ru [109.252.119.114]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: dmitry.osipenko) by madras.collabora.co.uk (Postfix) with ESMTPSA id 2F9B2660232A; Mon, 17 Oct 2022 18:24:12 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1666027456; bh=Ex3AyquhNB6SUyXxM39A6LQM86DSUXI6d8WILYiNDB4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D14SQhLaDc3wymEhfQ7kLOLaTxtKSAiqblynz43C7tbL9D87TBKj9qtbPtRFBl5Ic kvkmX9iLBEezccTFptMYfIZsAxP7NV4mdV6qTt+Lf3Ckfx6h1kPMZGVHErAzDSPl5F P1D6fEHo10EcXP/Bipt6/vA++Ef96gT5IAOt6Aj40ir/ztZO4RQYBUBkohSMkXIFbx WLQ5L+mUh9KjBkUe0zWKlm27XCOHUx7l+LZ6Pu0jBhzR1UzXVlzAEmfsnxx8Grpzmd +KBvqdSOy6UATlaRldthV2/8tkSd2Qa2P/DOAMyCHnepVWOFc+PuG0157aUl6S2IIY kEb5ReGRHuzpw== From: Dmitry Osipenko To: David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , Daniel Vetter , Daniel Almeida , Gert Wollny , Gustavo Padovan , Daniel Stone , Tomeu Vizoso , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Clark , Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , "Pan, Xinhui" , Thierry Reding , Tomasz Figa , Marek Szyprowski , Mauro Carvalho Chehab , Alex Deucher , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , =?utf-8?q?Thomas_Hellstr?= =?utf-8?q?=C3=B6m?= , Qiang Yu , Srinivas Kandagatla , Amol Maheshwari , Jason Gunthorpe , Leon Romanovsky , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Tomi Valkeinen , Russell King , Lucas Stach , Christian Gmeiner , Ruhl Michael J Date: Mon, 17 Oct 2022 20:22:09 +0300 Message-Id: <20221017172229.42269-2-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221017172229.42269-1-dmitry.osipenko@collabora.com> References: <20221017172229.42269-1-dmitry.osipenko@collabora.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v7 01/21] dma-buf: Add unlocked variant of vmapping functions X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-rdma@vger.kernel.org, linux-arm-msm@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, virtualization@lists.linux-foundation.org, linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org, Dmitry Osipenko , kernel@collabora.com, linux-media@vger.kernel.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Add unlocked variant of dma_buf_vmap/vunmap() that will be utilized by drivers that don't take the reservation lock explicitly. Acked-by: Sumit Semwal Acked-by: Christian König Signed-off-by: Dmitry Osipenko --- drivers/dma-buf/dma-buf.c | 43 +++++++++++++++++++++++++++++++++++++++ include/linux/dma-buf.h | 2 ++ 2 files changed, 45 insertions(+) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index efb4990b29e1..e95fc8dc3aed 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -1425,6 +1425,33 @@ int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map) } EXPORT_SYMBOL_NS_GPL(dma_buf_vmap, DMA_BUF); +/** + * dma_buf_vmap_unlocked - Create virtual mapping for the buffer object into kernel + * address space. Same restrictions as for vmap and friends apply. + * @dmabuf: [in] buffer to vmap + * @map: [out] returns the vmap pointer + * + * Unlocked version of dma_buf_vmap() + * + * Returns 0 on success, or a negative errno code otherwise. + */ +int dma_buf_vmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map) +{ + int ret; + + iosys_map_clear(map); + + if (WARN_ON(!dmabuf)) + return -EINVAL; + + dma_resv_lock(dmabuf->resv, NULL); + ret = dma_buf_vmap(dmabuf, map); + dma_resv_unlock(dmabuf->resv); + + return ret; +} +EXPORT_SYMBOL_NS_GPL(dma_buf_vmap_unlocked, DMA_BUF); + /** * dma_buf_vunmap - Unmap a vmap obtained by dma_buf_vmap. * @dmabuf: [in] buffer to vunmap @@ -1449,6 +1476,22 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct iosys_map *map) } EXPORT_SYMBOL_NS_GPL(dma_buf_vunmap, DMA_BUF); +/** + * dma_buf_vunmap_unlocked - Unmap a vmap obtained by dma_buf_vmap. + * @dmabuf: [in] buffer to vunmap + * @map: [in] vmap pointer to vunmap + */ +void dma_buf_vunmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map) +{ + if (WARN_ON(!dmabuf)) + return; + + dma_resv_lock(dmabuf->resv, NULL); + dma_buf_vunmap(dmabuf, map); + dma_resv_unlock(dmabuf->resv); +} +EXPORT_SYMBOL_NS_GPL(dma_buf_vunmap_unlocked, DMA_BUF); + #ifdef CONFIG_DEBUG_FS static int dma_buf_debug_show(struct seq_file *s, void *unused) { diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 71731796c8c3..8daa054dd7fe 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -632,4 +632,6 @@ int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *, unsigned long); int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map); void dma_buf_vunmap(struct dma_buf *dmabuf, struct iosys_map *map); +int dma_buf_vmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map); +void dma_buf_vunmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map); #endif /* __DMA_BUF_H__ */