From patchwork Sun Sep 3 17:07:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 13373305 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 430BDC71153 for ; Sun, 3 Sep 2023 17:09:26 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9776610E119; Sun, 3 Sep 2023 17:09:24 +0000 (UTC) Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by gabe.freedesktop.org (Postfix) with ESMTPS id 60D6710E0FF for ; Sun, 3 Sep 2023 17:08:57 +0000 (UTC) Received: from workpc.. (109-252-153-31.dynamic.spd-mgts.ru [109.252.153.31]) (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 DD35866072BC; Sun, 3 Sep 2023 18:08:54 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1693760936; bh=pOKiy71IMLlm3lGoxRhMtwlXgaG4qiertKmg8u8awXo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kQQZicD0WIoPLFu0eJF00353J4Gis9ZIIXtkM6XY6dEyw8VaO/PIOF7Ia2qTj1hAo 1/c6VWcgxHNfHlSpnL1NM5GFmXAT+GqHeUUwnXVyk6VgoJUpEtc3H+fujup8WcG8/1 Rer/i/iKowfL9KlKVjcZmwtjnwrkj5A4Tql7xVSYhpDOBcdtsTUfNhnbM++jdohmpe 0sRjxtLjSHyk0k81Nfl0nCM0n0e9NTGQOREuJG8UOCgU5WzqAWYtX2L3dbEhd//JAJ jOxCSm/9kgN84NGFXMVRl02Hddy07rgLaHp0nX2WUGq8LgFXzLBznfmZ1PG1muf0fP iVCJ1Z8qACEVQ== From: Dmitry Osipenko To: David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , Daniel Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , =?utf-8?q?Christian_K=C3=B6nig?= , Qiang Yu , Steven Price , Boris Brezillon , Emma Anholt , Melissa Wen Subject: [PATCH v16 13/20] drm/shmem-helper: Switch drm_gem_shmem_vmap/vunmap to use pin/unpin Date: Sun, 3 Sep 2023 20:07:29 +0300 Message-ID: <20230903170736.513347-14-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230903170736.513347-1-dmitry.osipenko@collabora.com> References: <20230903170736.513347-1-dmitry.osipenko@collabora.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kernel@collabora.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The vmapped pages shall be pinned in memory and previously get/put_pages() were implicitly hard-pinning/unpinning the pages. This will no longer be the case with addition of memory shrinker because pages_use_count > 0 won't determine anymore whether pages are hard-pinned (they will be soft-pinned), while the new pages_pin_count will do the hard-pinning. Switch the vmap/vunmap() to use pin/unpin() functions in a preparation of addition of the memory shrinker support to drm-shmem. Signed-off-by: Dmitry Osipenko Reviewed-by: Boris Brezillon --- drivers/gpu/drm/drm_gem_shmem_helper.c | 19 ++++++++++++------- include/drm/drm_gem_shmem_helper.h | 2 +- 2 files changed, 13 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index d93ebfef20c7..899f655a65bb 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -257,6 +257,14 @@ static int drm_gem_shmem_pin_locked(struct drm_gem_shmem_object *shmem) return ret; } +static void drm_gem_shmem_unpin_locked(struct drm_gem_shmem_object *shmem) +{ + dma_resv_assert_held(shmem->base.resv); + + if (refcount_dec_and_test(&shmem->pages_pin_count)) + drm_gem_shmem_put_pages_locked(shmem); +} + /** * drm_gem_shmem_pin - Pin backing pages for a shmem GEM object * @shmem: shmem GEM object @@ -304,10 +312,7 @@ void drm_gem_shmem_unpin(struct drm_gem_shmem_object *shmem) return; dma_resv_lock(shmem->base.resv, NULL); - - if (refcount_dec_and_test(&shmem->pages_pin_count)) - drm_gem_shmem_put_pages_locked(shmem); - + drm_gem_shmem_unpin_locked(shmem); dma_resv_unlock(shmem->base.resv); } EXPORT_SYMBOL_GPL(drm_gem_shmem_unpin); @@ -345,7 +350,7 @@ int drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem, return 0; } - ret = drm_gem_shmem_get_pages_locked(shmem); + ret = drm_gem_shmem_pin_locked(shmem); if (ret) goto err_zero_use; @@ -368,7 +373,7 @@ int drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem, err_put_pages: if (!obj->import_attach) - drm_gem_shmem_put_pages_locked(shmem); + drm_gem_shmem_unpin_locked(shmem); err_zero_use: shmem->vmap_use_count = 0; @@ -405,7 +410,7 @@ void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *shmem, return; vunmap(shmem->vaddr); - drm_gem_shmem_put_pages_locked(shmem); + drm_gem_shmem_unpin_locked(shmem); } shmem->vaddr = NULL; diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h index bd545428a7ee..396958a98c34 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -137,7 +137,7 @@ int drm_gem_shmem_madvise_locked(struct drm_gem_shmem_object *shmem, int madv); static inline bool drm_gem_shmem_is_purgeable(struct drm_gem_shmem_object *shmem) { return (shmem->madv > 0) && - !shmem->vmap_use_count && shmem->sgt && + !refcount_read(&shmem->pages_pin_count) && shmem->sgt && !shmem->base.dma_buf && !shmem->base.import_attach; }