From patchwork Sun Sep 3 17:07:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 13373297 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 E0AAFC83F3E for ; Sun, 3 Sep 2023 17:09:08 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 26F8E10E108; Sun, 3 Sep 2023 17:08:58 +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 BC6CB10E0F4 for ; Sun, 3 Sep 2023 17:08:52 +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 4BDC366072B0; Sun, 3 Sep 2023 18:08:50 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1693760931; bh=7rk0oOgFvKXBqty2fz2L0StvvcIwJhpwP0k+0Avtm2g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QIfZEEyKjzA7iShhP4zkRA5JknETlKVn6+nz+MtfDEKHBfFCpRB7p3zb2IepRk0NF 89r0VrsTGcvp6b6HSABx6eJvQX3wyCRKvP5wUUhTTAJXRCNCPInNLYah3o6g6C+77e OHi4adamaGznLlZIUsJtzr6zgkJ7wvA45RD4AQ+en7K0ewaIh/jtAC4tKDax8XNhUf m14UkNtixI6eWr8puflP2BbPn6KqGs/mVIMB6Cq7RI51lDcKCZfP36SBS+N8nXlNi3 +PORZl54UM0A3eReaSu5GZiSzXB2Rvdc9mX3shWhf9me7BxLGcI6/+nOK6nzko+rYo ObtGwVniFG8/Q== 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 10/20] drm/shmem-helper: Add and use pages_pin_count Date: Sun, 3 Sep 2023 20:07:26 +0300 Message-ID: <20230903170736.513347-11-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" Add separate pages_pin_count for tracking of whether drm-shmem pages are moveable or not. With the addition of memory shrinker support to drm-shmem, the pages_use_count will no longer determine whether pages are hard-pinned in memory, but whether pages exist and are soft-pinned (and could be swapped out). The pages_pin_count > 1 will hard-pin pages in memory. Suggested-by: Boris Brezillon Signed-off-by: Dmitry Osipenko Reviewed-by: Boris Brezillon --- drivers/gpu/drm/drm_gem_shmem_helper.c | 24 ++++++++++++++++-------- include/drm/drm_gem_shmem_helper.h | 10 ++++++++++ 2 files changed, 26 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 25e99468ced2..7e1e674e2c9f 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -236,18 +236,16 @@ static int drm_gem_shmem_pin_locked(struct drm_gem_shmem_object *shmem) dma_resv_assert_held(shmem->base.resv); + if (refcount_inc_not_zero(&shmem->pages_pin_count)) + return 0; + ret = drm_gem_shmem_get_pages_locked(shmem); + if (!ret) + refcount_set(&shmem->pages_pin_count, 1); return ret; } -static void drm_gem_shmem_unpin_locked(struct drm_gem_shmem_object *shmem) -{ - dma_resv_assert_held(shmem->base.resv); - - drm_gem_shmem_put_pages_locked(shmem); -} - /** * drm_gem_shmem_pin - Pin backing pages for a shmem GEM object * @shmem: shmem GEM object @@ -265,6 +263,9 @@ int drm_gem_shmem_pin(struct drm_gem_shmem_object *shmem) drm_WARN_ON(obj->dev, obj->import_attach); + if (refcount_inc_not_zero(&shmem->pages_pin_count)) + return 0; + ret = dma_resv_lock_interruptible(shmem->base.resv, NULL); if (ret) return ret; @@ -288,8 +289,14 @@ void drm_gem_shmem_unpin(struct drm_gem_shmem_object *shmem) drm_WARN_ON(obj->dev, obj->import_attach); + if (refcount_dec_not_one(&shmem->pages_pin_count)) + return; + dma_resv_lock(shmem->base.resv, NULL); - drm_gem_shmem_unpin_locked(shmem); + + if (refcount_dec_and_test(&shmem->pages_pin_count)) + drm_gem_shmem_put_pages_locked(shmem); + dma_resv_unlock(shmem->base.resv); } EXPORT_SYMBOL_GPL(drm_gem_shmem_unpin); @@ -634,6 +641,7 @@ void drm_gem_shmem_print_info(const struct drm_gem_shmem_object *shmem, if (shmem->base.import_attach) return; + drm_printf_indent(p, indent, "pages_pin_count=%u\n", refcount_read(&shmem->pages_pin_count)); drm_printf_indent(p, indent, "pages_use_count=%u\n", shmem->pages_use_count); drm_printf_indent(p, indent, "vmap_use_count=%u\n", shmem->vmap_use_count); drm_printf_indent(p, indent, "vaddr=%p\n", shmem->vaddr); diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h index 808083279fd5..1cd74ae5761a 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -39,6 +39,16 @@ struct drm_gem_shmem_object { */ unsigned int pages_use_count; + /** + * @pages_pin_count: + * + * Reference count on the pinned pages table. + * The pages allowed to be evicted and purged by memory + * shrinker only when the count is zero, otherwise pages + * are hard-pinned in memory. + */ + refcount_t pages_pin_count; + /** * @madv: State for madvise *