From patchwork Sun Aug 27 17:54:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 13367357 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 230BEC83F01 for ; Sun, 27 Aug 2023 17:56:46 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B095010E1F3; Sun, 27 Aug 2023 17:56:37 +0000 (UTC) Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3BBA810E1E4; Sun, 27 Aug 2023 17:56:32 +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 686AD6607297; Sun, 27 Aug 2023 18:56:29 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1693158991; bh=DszJGXwKHynZ1/vqDxxYVgeWqLyAdAH1M7V2d+HvxYQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aiKPzqnhWCbN+5JBrKao7DOl1Cavl2k6FwDQbvuLUSWLKdyLoTQytd0bnQGOIheUt 76yy1JcTtcur6z1hBOAZgKfXU9gmQgQVa0n4mCx+KDZrn0qf5jmMbkYVKJAH14z576 MbefKJRGQKCu2li3SRahZg7rPHYviaS8TxGCpbA//k49jNegQXe+D7CBG/DhAsT9gh w8Mm40SLn4Af7I2WaW840ompQhlO0PHJ7d4UMdXXtfhmxSa6ZtDMB9JDrSp7C7zie5 kcHA3sYcGv1uom2OnUyQ6HZ3V/rr2qUvza6NB28Lxdhr7KqWR9Rl2wdOqckFXunQgx mUwwDqBQItF7A== 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 , Will Deacon , Peter Zijlstra , Boqun Feng , Mark Rutland Subject: [PATCH v15 23/23] drm/panfrost: Switch to generic memory shrinker Date: Sun, 27 Aug 2023 20:54:49 +0300 Message-ID: <20230827175449.1766701-24-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230827175449.1766701-1-dmitry.osipenko@collabora.com> References: <20230827175449.1766701-1-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: intel-gfx@lists.freedesktop.org, 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" Replace Panfrost's custom memory shrinker with a common drm-shmem memory shrinker. Tested-by: Steven Price # Firefly-RK3288 Reviewed-by: Steven Price Signed-off-by: Dmitry Osipenko --- drivers/gpu/drm/panfrost/Makefile | 1 - drivers/gpu/drm/panfrost/panfrost_device.h | 4 - drivers/gpu/drm/panfrost/panfrost_drv.c | 27 ++-- drivers/gpu/drm/panfrost/panfrost_gem.c | 30 ++-- drivers/gpu/drm/panfrost/panfrost_gem.h | 9 -- .../gpu/drm/panfrost/panfrost_gem_shrinker.c | 129 ------------------ drivers/gpu/drm/panfrost/panfrost_job.c | 18 ++- include/drm/drm_gem_shmem_helper.h | 7 - 8 files changed, 47 insertions(+), 178 deletions(-) delete mode 100644 drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c diff --git a/drivers/gpu/drm/panfrost/Makefile b/drivers/gpu/drm/panfrost/Makefile index 7da2b3f02ed9..11622e22cf15 100644 --- a/drivers/gpu/drm/panfrost/Makefile +++ b/drivers/gpu/drm/panfrost/Makefile @@ -5,7 +5,6 @@ panfrost-y := \ panfrost_device.o \ panfrost_devfreq.o \ panfrost_gem.o \ - panfrost_gem_shrinker.o \ panfrost_gpu.o \ panfrost_job.o \ panfrost_mmu.o \ diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h index b0126b9fbadc..dcc2571c092b 100644 --- a/drivers/gpu/drm/panfrost/panfrost_device.h +++ b/drivers/gpu/drm/panfrost/panfrost_device.h @@ -116,10 +116,6 @@ struct panfrost_device { atomic_t pending; } reset; - struct mutex shrinker_lock; - struct list_head shrinker_list; - struct shrinker shrinker; - struct panfrost_devfreq pfdevfreq; }; diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c index 175443eacead..8cf338c2a03b 100644 --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -170,7 +170,6 @@ panfrost_lookup_bos(struct drm_device *dev, break; } - atomic_inc(&bo->gpu_usecount); job->mappings[i] = mapping; } @@ -395,7 +394,6 @@ static int panfrost_ioctl_madvise(struct drm_device *dev, void *data, { struct panfrost_file_priv *priv = file_priv->driver_priv; struct drm_panfrost_madvise *args = data; - struct panfrost_device *pfdev = dev->dev_private; struct drm_gem_object *gem_obj; struct panfrost_gem_object *bo; int ret = 0; @@ -408,11 +406,15 @@ static int panfrost_ioctl_madvise(struct drm_device *dev, void *data, bo = to_panfrost_bo(gem_obj); + if (bo->is_heap) { + args->retained = 1; + goto out_put_object; + } + ret = dma_resv_lock_interruptible(bo->base.base.resv, NULL); if (ret) goto out_put_object; - mutex_lock(&pfdev->shrinker_lock); mutex_lock(&bo->mappings.lock); if (args->madv == PANFROST_MADV_DONTNEED) { struct panfrost_gem_mapping *first; @@ -438,17 +440,8 @@ static int panfrost_ioctl_madvise(struct drm_device *dev, void *data, args->retained = drm_gem_shmem_madvise_locked(&bo->base, args->madv); - if (args->retained) { - if (args->madv == PANFROST_MADV_DONTNEED) - list_move_tail(&bo->base.madv_list, - &pfdev->shrinker_list); - else if (args->madv == PANFROST_MADV_WILLNEED) - list_del_init(&bo->base.madv_list); - } - out_unlock_mappings: mutex_unlock(&bo->mappings.lock); - mutex_unlock(&pfdev->shrinker_lock); dma_resv_unlock(bo->base.base.resv); out_put_object: drm_gem_object_put(gem_obj); @@ -577,9 +570,6 @@ static int panfrost_probe(struct platform_device *pdev) ddev->dev_private = pfdev; pfdev->ddev = ddev; - mutex_init(&pfdev->shrinker_lock); - INIT_LIST_HEAD(&pfdev->shrinker_list); - err = panfrost_device_init(pfdev); if (err) { if (err != -EPROBE_DEFER) @@ -601,10 +591,14 @@ static int panfrost_probe(struct platform_device *pdev) if (err < 0) goto err_out1; - panfrost_gem_shrinker_init(ddev); + err = drmm_gem_shmem_init(ddev); + if (err < 0) + goto err_out2; return 0; +err_out2: + drm_dev_unregister(ddev); err_out1: pm_runtime_disable(pfdev->dev); panfrost_device_fini(pfdev); @@ -620,7 +614,6 @@ static void panfrost_remove(struct platform_device *pdev) struct drm_device *ddev = pfdev->ddev; drm_dev_unregister(ddev); - panfrost_gem_shrinker_cleanup(ddev); pm_runtime_get_sync(pfdev->dev); pm_runtime_disable(pfdev->dev); diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c index 59c8c73c6a59..00165fca7f3d 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem.c +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c @@ -19,16 +19,6 @@ static void panfrost_gem_free_object(struct drm_gem_object *obj) struct panfrost_gem_object *bo = to_panfrost_bo(obj); struct panfrost_device *pfdev = obj->dev->dev_private; - /* - * Make sure the BO is no longer inserted in the shrinker list before - * taking care of the destruction itself. If we don't do that we have a - * race condition between this function and what's done in - * panfrost_gem_shrinker_scan(). - */ - mutex_lock(&pfdev->shrinker_lock); - list_del_init(&bo->base.madv_list); - mutex_unlock(&pfdev->shrinker_lock); - /* * If we still have mappings attached to the BO, there's a problem in * our refcounting. @@ -195,6 +185,25 @@ static int panfrost_gem_pin(struct drm_gem_object *obj) return drm_gem_shmem_object_pin(obj); } +static int panfrost_shmem_evict(struct drm_gem_object *obj) +{ + struct panfrost_gem_object *bo = to_panfrost_bo(obj); + + if (!drm_gem_shmem_is_purgeable(&bo->base)) + return -EBUSY; + + if (!mutex_trylock(&bo->mappings.lock)) + return -EBUSY; + + panfrost_gem_teardown_mappings_locked(bo); + + drm_gem_shmem_purge_locked(&bo->base); + + mutex_unlock(&bo->mappings.lock); + + return 0; +} + static const struct drm_gem_object_funcs panfrost_gem_funcs = { .free = panfrost_gem_free_object, .open = panfrost_gem_open, @@ -207,6 +216,7 @@ static const struct drm_gem_object_funcs panfrost_gem_funcs = { .vunmap = drm_gem_shmem_object_vunmap_locked, .mmap = drm_gem_shmem_object_mmap, .vm_ops = &drm_gem_shmem_vm_ops, + .evict = panfrost_shmem_evict, }; /** diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.h b/drivers/gpu/drm/panfrost/panfrost_gem.h index ad2877eeeccd..6ad1bcedb932 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem.h +++ b/drivers/gpu/drm/panfrost/panfrost_gem.h @@ -30,12 +30,6 @@ struct panfrost_gem_object { struct mutex lock; } mappings; - /* - * Count the number of jobs referencing this BO so we don't let the - * shrinker reclaim this object prematurely. - */ - atomic_t gpu_usecount; - bool noexec :1; bool is_heap :1; }; @@ -81,7 +75,4 @@ panfrost_gem_mapping_get(struct panfrost_gem_object *bo, void panfrost_gem_mapping_put(struct panfrost_gem_mapping *mapping); void panfrost_gem_teardown_mappings_locked(struct panfrost_gem_object *bo); -void panfrost_gem_shrinker_init(struct drm_device *dev); -void panfrost_gem_shrinker_cleanup(struct drm_device *dev); - #endif /* __PANFROST_GEM_H__ */ diff --git a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c deleted file mode 100644 index eb810403b027..000000000000 --- a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c +++ /dev/null @@ -1,129 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* Copyright (C) 2019 Arm Ltd. - * - * Based on msm_gem_freedreno.c: - * Copyright (C) 2016 Red Hat - * Author: Rob Clark - */ - -#include - -#include -#include - -#include "panfrost_device.h" -#include "panfrost_gem.h" -#include "panfrost_mmu.h" - -static bool panfrost_gem_shmem_is_purgeable(struct drm_gem_shmem_object *shmem) -{ - return (shmem->madv > 0) && - !kref_read(&shmem->pages_pin_count) && shmem->sgt && - !shmem->base.dma_buf && !shmem->base.import_attach; -} - -static unsigned long -panfrost_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) -{ - struct panfrost_device *pfdev = - container_of(shrinker, struct panfrost_device, shrinker); - struct drm_gem_shmem_object *shmem; - unsigned long count = 0; - - if (!mutex_trylock(&pfdev->shrinker_lock)) - return 0; - - list_for_each_entry(shmem, &pfdev->shrinker_list, madv_list) { - if (panfrost_gem_shmem_is_purgeable(shmem)) - count += shmem->base.size >> PAGE_SHIFT; - } - - mutex_unlock(&pfdev->shrinker_lock); - - return count; -} - -static bool panfrost_gem_purge(struct drm_gem_object *obj) -{ - struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); - struct panfrost_gem_object *bo = to_panfrost_bo(obj); - bool ret = false; - - if (atomic_read(&bo->gpu_usecount)) - return false; - - if (!mutex_trylock(&bo->mappings.lock)) - return false; - - if (!dma_resv_trylock(shmem->base.resv)) - goto unlock_mappings; - - panfrost_gem_teardown_mappings_locked(bo); - drm_gem_shmem_purge_locked(&bo->base); - ret = true; - - dma_resv_unlock(shmem->base.resv); - -unlock_mappings: - mutex_unlock(&bo->mappings.lock); - return ret; -} - -static unsigned long -panfrost_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) -{ - struct panfrost_device *pfdev = - container_of(shrinker, struct panfrost_device, shrinker); - struct drm_gem_shmem_object *shmem, *tmp; - unsigned long freed = 0; - - if (!mutex_trylock(&pfdev->shrinker_lock)) - return SHRINK_STOP; - - list_for_each_entry_safe(shmem, tmp, &pfdev->shrinker_list, madv_list) { - if (freed >= sc->nr_to_scan) - break; - if (drm_gem_shmem_is_purgeable(shmem) && - panfrost_gem_purge(&shmem->base)) { - freed += shmem->base.size >> PAGE_SHIFT; - list_del_init(&shmem->madv_list); - } - } - - mutex_unlock(&pfdev->shrinker_lock); - - if (freed > 0) - pr_info_ratelimited("Purging %lu bytes\n", freed << PAGE_SHIFT); - - return freed; -} - -/** - * panfrost_gem_shrinker_init - Initialize panfrost shrinker - * @dev: DRM device - * - * This function registers and sets up the panfrost shrinker. - */ -void panfrost_gem_shrinker_init(struct drm_device *dev) -{ - struct panfrost_device *pfdev = dev->dev_private; - pfdev->shrinker.count_objects = panfrost_gem_shrinker_count; - pfdev->shrinker.scan_objects = panfrost_gem_shrinker_scan; - pfdev->shrinker.seeks = DEFAULT_SEEKS; - WARN_ON(register_shrinker(&pfdev->shrinker, "drm-panfrost")); -} - -/** - * panfrost_gem_shrinker_cleanup - Clean up panfrost shrinker - * @dev: DRM device - * - * This function unregisters the panfrost shrinker. - */ -void panfrost_gem_shrinker_cleanup(struct drm_device *dev) -{ - struct panfrost_device *pfdev = dev->dev_private; - - if (pfdev->shrinker.nr_deferred) { - unregister_shrinker(&pfdev->shrinker); - } -} diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c index dbc597ab46fb..98d9751d2b2c 100644 --- a/drivers/gpu/drm/panfrost/panfrost_job.c +++ b/drivers/gpu/drm/panfrost/panfrost_job.c @@ -272,6 +272,19 @@ static void panfrost_attach_object_fences(struct drm_gem_object **bos, dma_resv_add_fence(bos[i]->resv, fence, DMA_RESV_USAGE_WRITE); } +static int panfrost_objects_prepare(struct drm_gem_object **bos, int bo_count) +{ + struct panfrost_gem_object *bo; + int ret = 0; + + while (!ret && bo_count--) { + bo = to_panfrost_bo(bos[bo_count]); + ret = bo->base.madv ? -ENOMEM : 0; + } + + return ret; +} + int panfrost_job_push(struct panfrost_job *job) { struct panfrost_device *pfdev = job->pfdev; @@ -283,6 +296,10 @@ int panfrost_job_push(struct panfrost_job *job) if (ret) return ret; + ret = panfrost_objects_prepare(job->bos, job->bo_count); + if (ret) + goto unlock; + mutex_lock(&pfdev->sched_lock); drm_sched_job_arm(&job->base); @@ -324,7 +341,6 @@ static void panfrost_job_cleanup(struct kref *ref) if (!job->mappings[i]) break; - atomic_dec(&job->mappings[i]->obj->gpu_usecount); panfrost_gem_mapping_put(job->mappings[i]); } kvfree(job->mappings); diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h index e10ba533f74d..e52921d03c6f 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -60,13 +60,6 @@ struct drm_gem_shmem_object { */ int madv; - /** - * @madv_list: List entry for madvise tracking - * - * Typically used by drivers to track purgeable objects - */ - struct list_head madv_list; - /** * @sgt: Scatter/gather table for imported PRIME buffers */