From patchwork Fri Jan 5 18:46:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 13512461 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 4FE89C47077 for ; Fri, 5 Jan 2024 18:47:08 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 62EC310E67D; Fri, 5 Jan 2024 18:47:06 +0000 (UTC) Received: from madrid.collaboradmins.com (madrid.collaboradmins.com [IPv6:2a00:1098:ed:100::25]) by gabe.freedesktop.org (Postfix) with ESMTPS id E347A10E67A for ; Fri, 5 Jan 2024 18:47:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1704480423; bh=xi7umfn3odK5/kuqYD+1GYoRfQ0wyb5ZdiidzOwD6Fg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aVeYBhwZRIhsDGR8JNg4W1K4IyB5of3osKSyffgpHpmO7cUAD1oSr6XDnxCxplEGt cbbPrZH8nlbs87hGn59EXGf+0cQikhVOXvLjnXqTEMhsQQmeXU2TOprdWPaqmKQU2Y S4xcYlV6Z5xpnLTyRXl+NS75Akvw9m3E1XRZh8n79DDi/WFqzdtCkqQKYi1WwPNDEv yOmMAYeaUOYaM5VGQsj3+pkIc+qjgOOfsC+L6yRRpZRu5Ztns/KvU4Zz2X8wnPYJNx 9Hz4sv675X/aEWT/iAeIqa+5ZYk0hgvY78HCj09JEyy+RhzHeff/yYtuvAT1PiC4WJ WYUY8nQfqD1Aw== Received: from workpc.. (cola.collaboradmins.com [195.201.22.229]) (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 madrid.collaboradmins.com (Postfix) with ESMTPSA id 6B0083782042; Fri, 5 Jan 2024 18:47:02 +0000 (UTC) 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 v19 12/30] drm/shmem-helper: Prepare drm_gem_shmem_free() to shrinker addition Date: Fri, 5 Jan 2024 21:46:06 +0300 Message-ID: <20240105184624.508603-13-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240105184624.508603-1-dmitry.osipenko@collabora.com> References: <20240105184624.508603-1-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" Prepare drm_gem_shmem_free() to addition of memory shrinker support to drm-shmem by adding and using variant of put_pages() that doesn't touch reservation lock. Reservation shouldn't be touched because lockdep will trigger a bogus warning about locking contention with fs_reclaim code paths that can't happen during the time when GEM is freed and lockdep doesn't know about that. Signed-off-by: Dmitry Osipenko Reviewed-by: Boris Brezillon --- drivers/gpu/drm/drm_gem_shmem_helper.c | 40 ++++++++++++++------------ 1 file changed, 21 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 3403700780c3..799a3c5015ad 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -128,6 +128,22 @@ struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t } EXPORT_SYMBOL_GPL(drm_gem_shmem_create); +static void +drm_gem_shmem_free_pages(struct drm_gem_shmem_object *shmem) +{ + struct drm_gem_object *obj = &shmem->base; + +#ifdef CONFIG_X86 + if (shmem->map_wc) + set_pages_array_wb(shmem->pages, obj->size >> PAGE_SHIFT); +#endif + + drm_gem_put_pages(obj, shmem->pages, + shmem->pages_mark_dirty_on_put, + shmem->pages_mark_accessed_on_put); + shmem->pages = NULL; +} + /** * drm_gem_shmem_free - Free resources associated with a shmem GEM object * @shmem: shmem GEM object to free @@ -142,8 +158,6 @@ void drm_gem_shmem_free(struct drm_gem_shmem_object *shmem) if (obj->import_attach) { drm_prime_gem_destroy(obj, shmem->sgt); } else { - dma_resv_lock(shmem->base.resv, NULL); - drm_WARN_ON(obj->dev, refcount_read(&shmem->vmap_use_count)); if (shmem->sgt) { @@ -152,13 +166,12 @@ void drm_gem_shmem_free(struct drm_gem_shmem_object *shmem) sg_free_table(shmem->sgt); kfree(shmem->sgt); } - if (shmem->pages) - drm_gem_shmem_put_pages_locked(shmem); + if (shmem->pages && + refcount_dec_and_test(&shmem->pages_use_count)) + drm_gem_shmem_free_pages(shmem); drm_WARN_ON(obj->dev, refcount_read(&shmem->pages_use_count)); drm_WARN_ON(obj->dev, refcount_read(&shmem->pages_pin_count)); - - dma_resv_unlock(shmem->base.resv); } drm_gem_object_release(obj); @@ -208,21 +221,10 @@ static int drm_gem_shmem_get_pages_locked(struct drm_gem_shmem_object *shmem) */ void drm_gem_shmem_put_pages_locked(struct drm_gem_shmem_object *shmem) { - struct drm_gem_object *obj = &shmem->base; - dma_resv_assert_held(shmem->base.resv); - if (refcount_dec_and_test(&shmem->pages_use_count)) { -#ifdef CONFIG_X86 - if (shmem->map_wc) - set_pages_array_wb(shmem->pages, obj->size >> PAGE_SHIFT); -#endif - - drm_gem_put_pages(obj, shmem->pages, - shmem->pages_mark_dirty_on_put, - shmem->pages_mark_accessed_on_put); - shmem->pages = NULL; - } + if (refcount_dec_and_test(&shmem->pages_use_count)) + drm_gem_shmem_free_pages(shmem); } EXPORT_SYMBOL_GPL(drm_gem_shmem_put_pages_locked);