From patchwork Fri Feb 5 08:06:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 12069551 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA5BDC43381 for ; Fri, 5 Feb 2021 08:12:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8254264FCA for ; Fri, 5 Feb 2021 08:12:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231591AbhBEIMZ (ORCPT ); Fri, 5 Feb 2021 03:12:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55568 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231576AbhBEIHH (ORCPT ); Fri, 5 Feb 2021 03:07:07 -0500 Received: from mail-pf1-x434.google.com (mail-pf1-x434.google.com [IPv6:2607:f8b0:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B44B7C06178B for ; Fri, 5 Feb 2021 00:06:27 -0800 (PST) Received: by mail-pf1-x434.google.com with SMTP id f63so3799059pfa.13 for ; Fri, 05 Feb 2021 00:06:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=vyfEY4onehbYsafXLmYmoPdU8uLUNcWKOMLwNwKoKkY=; b=kfBKmBc2V0gCtxWa0NO7oYwzFwIGrntrUmxp3VWtIk9vVbZiIidKiPuJA8fq913qm6 y/TLIbZegnoQtgZWXnoY0F50XKk+gmOZBOwtXXODAsfVg6j2csvgf5rnxg3kvcEij+Ww iA5FM3Ee09ZD6RBVdpGH/37PXPYY7mc9loOttqO8p5Kpw0YabwufzJtMCqY7VcFk+oAq YvAiZsgXhttv4oltgliHjQ1eb+C68HNj8UhmQEkTcS00U71i/PuTJSsaCPgh+0YnQ3Ya Y10M/IVlNiVkfY9tmMF4EnfFLAG+Ffi0ChQ48uNWk5lSk1S2yOklIIh9QB1yixCp6BMu 8Evg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=vyfEY4onehbYsafXLmYmoPdU8uLUNcWKOMLwNwKoKkY=; b=WJUnWDm26lmDmzPFPnb6QYe4oXSabpOg3rlq+Ac9IkjdbDWle8KciFO655BSm/Muhk Sn/wSszA1hRBSqzqEOJWuq/V8a8J1sTr3e0iVjDuZ8MvFnwjeHBWCTXAjaaIkav7wHP6 2qG9n+KCtCIM1Y1KVA2ejGoKj4PTf8rQhcR653H0yW8cg23ATJeeQiydd04WIOcqmbGA EumiTcAV/p0UaLG2SqN6lCuPiCoJtpHSwSorbrQBM2Zq+/3+dOJdh/96UbzzkNx1yeWf TCRz2CEj0BBNSpunV2XliCqPw1gaJFwTYJMLP0LdyLJHF/dLIQpffHTXTCP7XqD39ciT Wc7w== X-Gm-Message-State: AOAM530jFFyE5J/olOmYRf9NG6I6f3rhlIEooq7hNgOfnlSiqrkEFoHV fS1cPC90+5QmlInaXhpWpfRVTg== X-Google-Smtp-Source: ABdhPJxFjQUH9qw9ZOiSQdFgimdjCJe9nf79dM7toVaJnYzL9q5QJkTgttrX+W6LBLzy/l57Ue2JIA== X-Received: by 2002:a63:f19:: with SMTP id e25mr3205563pgl.220.1612512387276; Fri, 05 Feb 2021 00:06:27 -0800 (PST) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id 32sm9520070pgq.80.2021.02.05.00.06.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Feb 2021 00:06:26 -0800 (PST) From: John Stultz To: lkml Cc: John Stultz , Daniel Vetter , Christian Koenig , Sumit Semwal , Liam Mark , Chris Goldsworthy , Laura Abbott , Brian Starkey , Hridya Valsaraju , Suren Baghdasaryan , Sandeep Patil , Daniel Mentz , =?utf-8?q?=C3=98rjan_Eide?= , Robin Murphy , Ezequiel Garcia , Simon Ser , James Jones , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [RFC][PATCH v6 1/7] drm: Add a sharable drm page-pool implementation Date: Fri, 5 Feb 2021 08:06:15 +0000 Message-Id: <20210205080621.3102035-2-john.stultz@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210205080621.3102035-1-john.stultz@linaro.org> References: <20210205080621.3102035-1-john.stultz@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This adds a shrinker controlled page pool, closely following the ttm_pool logic, which is abstracted out a bit so it can be used by other non-ttm drivers. Cc: Daniel Vetter Cc: Christian Koenig Cc: Sumit Semwal Cc: Liam Mark Cc: Chris Goldsworthy Cc: Laura Abbott Cc: Brian Starkey Cc: Hridya Valsaraju Cc: Suren Baghdasaryan Cc: Sandeep Patil Cc: Daniel Mentz Cc: Ørjan Eide Cc: Robin Murphy Cc: Ezequiel Garcia Cc: Simon Ser Cc: James Jones Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Signed-off-by: John Stultz --- drivers/gpu/drm/Kconfig | 4 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/page_pool.c | 220 ++++++++++++++++++++++++++++++++++++ include/drm/page_pool.h | 54 +++++++++ 4 files changed, 279 insertions(+) create mode 100644 drivers/gpu/drm/page_pool.c create mode 100644 include/drm/page_pool.h diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 0973f408d75f..d16bf340ed2e 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -174,6 +174,10 @@ config DRM_DP_CEC Note: not all adapters support this feature, and even for those that do support this they often do not hook up the CEC pin. +config DRM_PAGE_POOL + bool + depends on DRM + config DRM_TTM tristate depends on DRM && MMU diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index fefaff4c832d..877e0111ed34 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -32,6 +32,7 @@ drm-$(CONFIG_AGP) += drm_agpsupport.o drm-$(CONFIG_PCI) += drm_pci.o drm-$(CONFIG_DEBUG_FS) += drm_debugfs.o drm_debugfs_crc.o drm-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o +drm-$(CONFIG_DRM_PAGE_POOL) += page_pool.o drm_vram_helper-y := drm_gem_vram_helper.o obj-$(CONFIG_DRM_VRAM_HELPER) += drm_vram_helper.o diff --git a/drivers/gpu/drm/page_pool.c b/drivers/gpu/drm/page_pool.c new file mode 100644 index 000000000000..2139f86e6ca7 --- /dev/null +++ b/drivers/gpu/drm/page_pool.c @@ -0,0 +1,220 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * DRM page pool system + * + * Copyright (C) 2020 Linaro Ltd. + * + * Based on the ION page pool code + * Copyright (C) 2011 Google, Inc. + * As well as the ttm_pool code + * Copyright (C) 2020 Advanced Micro Devices, Inc. + */ + +#include +#include +#include +#include +#include +#include + +static LIST_HEAD(pool_list); +static DEFINE_MUTEX(pool_list_lock); +static atomic_long_t total_pages; +static unsigned long page_pool_max; +MODULE_PARM_DESC(page_pool_max, "Number of pages in the WC/UC/DMA pool"); +module_param(page_pool_max, ulong, 0644); + +void drm_page_pool_set_max(unsigned long max) +{ + /* only write once */ + if (!page_pool_max) + page_pool_max = max; +} + +unsigned long drm_page_pool_get_max(void) +{ + return page_pool_max; +} + +unsigned long drm_page_pool_get_total(void) +{ + return atomic_long_read(&total_pages); +} + +int drm_page_pool_get_size(struct drm_page_pool *pool) +{ + int ret; + + spin_lock(&pool->lock); + ret = pool->count; + spin_unlock(&pool->lock); + return ret; +} + +static inline unsigned int drm_page_pool_free_pages(struct drm_page_pool *pool, + struct page *page) +{ + return pool->free(page, pool->order); +} + +static int drm_page_pool_shrink_one(void); + +void drm_page_pool_add(struct drm_page_pool *pool, struct page *page) +{ + spin_lock(&pool->lock); + list_add_tail(&page->lru, &pool->items); + pool->count++; + atomic_long_add(1 << pool->order, &total_pages); + spin_unlock(&pool->lock); + + mod_node_page_state(page_pgdat(page), NR_KERNEL_MISC_RECLAIMABLE, + 1 << pool->order); + + /* make sure we don't grow too large */ + while (page_pool_max && atomic_long_read(&total_pages) > page_pool_max) + drm_page_pool_shrink_one(); +} +EXPORT_SYMBOL_GPL(drm_page_pool_add); + +static struct page *drm_page_pool_remove(struct drm_page_pool *pool) +{ + struct page *page; + + if (!pool->count) + return NULL; + + page = list_first_entry(&pool->items, struct page, lru); + pool->count--; + atomic_long_sub(1 << pool->order, &total_pages); + + list_del(&page->lru); + mod_node_page_state(page_pgdat(page), NR_KERNEL_MISC_RECLAIMABLE, + -(1 << pool->order)); + return page; +} + +struct page *drm_page_pool_fetch(struct drm_page_pool *pool) +{ + struct page *page = NULL; + + if (!pool) { + WARN_ON(!pool); + return NULL; + } + + spin_lock(&pool->lock); + page = drm_page_pool_remove(pool); + spin_unlock(&pool->lock); + + return page; +} +EXPORT_SYMBOL_GPL(drm_page_pool_fetch); + +struct drm_page_pool *drm_page_pool_create(unsigned int order, + int (*free_page)(struct page *p, unsigned int order)) +{ + struct drm_page_pool *pool = kmalloc(sizeof(*pool), GFP_KERNEL); + + if (!pool) + return NULL; + + pool->count = 0; + INIT_LIST_HEAD(&pool->items); + pool->order = order; + pool->free = free_page; + spin_lock_init(&pool->lock); + INIT_LIST_HEAD(&pool->list); + + mutex_lock(&pool_list_lock); + list_add(&pool->list, &pool_list); + mutex_unlock(&pool_list_lock); + + return pool; +} +EXPORT_SYMBOL_GPL(drm_page_pool_create); + +void drm_page_pool_destroy(struct drm_page_pool *pool) +{ + struct page *page; + + /* Remove us from the pool list */ + mutex_lock(&pool_list_lock); + list_del(&pool->list); + mutex_unlock(&pool_list_lock); + + /* Free any remaining pages in the pool */ + spin_lock(&pool->lock); + while (pool->count) { + page = drm_page_pool_remove(pool); + spin_unlock(&pool->lock); + drm_page_pool_free_pages(pool, page); + spin_lock(&pool->lock); + } + spin_unlock(&pool->lock); + + kfree(pool); +} +EXPORT_SYMBOL_GPL(drm_page_pool_destroy); + +static int drm_page_pool_shrink_one(void) +{ + struct drm_page_pool *pool; + struct page *page; + int nr_freed = 0; + + mutex_lock(&pool_list_lock); + pool = list_first_entry(&pool_list, typeof(*pool), list); + + spin_lock(&pool->lock); + page = drm_page_pool_remove(pool); + spin_unlock(&pool->lock); + + if (page) + nr_freed = drm_page_pool_free_pages(pool, page); + + list_move_tail(&pool->list, &pool_list); + mutex_unlock(&pool_list_lock); + + return nr_freed; +} + +static unsigned long drm_page_pool_shrink_count(struct shrinker *shrinker, + struct shrink_control *sc) +{ + unsigned long count = atomic_long_read(&total_pages); + + return count ? count : SHRINK_EMPTY; +} + +static unsigned long drm_page_pool_shrink_scan(struct shrinker *shrinker, + struct shrink_control *sc) +{ + int to_scan = sc->nr_to_scan; + int nr_total = 0; + + if (to_scan == 0) + return 0; + + do { + int nr_freed = drm_page_pool_shrink_one(); + + to_scan -= nr_freed; + nr_total += nr_freed; + } while (to_scan >= 0 && atomic_long_read(&total_pages)); + + return nr_total; +} + +static struct shrinker pool_shrinker = { + .count_objects = drm_page_pool_shrink_count, + .scan_objects = drm_page_pool_shrink_scan, + .seeks = 1, + .batch = 0, +}; + +int drm_page_pool_init_shrinker(void) +{ + return register_shrinker(&pool_shrinker); +} +module_init(drm_page_pool_init_shrinker); +MODULE_LICENSE("GPL v2"); diff --git a/include/drm/page_pool.h b/include/drm/page_pool.h new file mode 100644 index 000000000000..47e240b2bc69 --- /dev/null +++ b/include/drm/page_pool.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0 OR MIT */ +/* + * Copyright 2020 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Christian König + */ + +#ifndef _DRM_PAGE_POOL_H_ +#define _DRM_PAGE_POOL_H_ + +#include +#include +#include + +struct drm_page_pool { + int count; + struct list_head items; + + int order; + int (*free)(struct page *p, unsigned int order); + + spinlock_t lock; + struct list_head list; +}; + +void drm_page_pool_set_max(unsigned long max); +unsigned long drm_page_pool_get_max(void); +unsigned long drm_page_pool_get_total(void); +int drm_page_pool_get_size(struct drm_page_pool *pool); +struct page *drm_page_pool_fetch(struct drm_page_pool *pool); +void drm_page_pool_add(struct drm_page_pool *pool, struct page *page); +struct drm_page_pool *drm_page_pool_create(unsigned int order, + int (*free_page)(struct page *p, unsigned int order)); +void drm_page_pool_destroy(struct drm_page_pool *pool); + +#endif From patchwork Fri Feb 5 08:06:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 12069537 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 545B6C433DB for ; Fri, 5 Feb 2021 08:07:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0D72F64FBB for ; Fri, 5 Feb 2021 08:07:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231269AbhBEIHj (ORCPT ); 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Fri, 05 Feb 2021 00:06:28 -0800 (PST) From: John Stultz To: lkml Cc: John Stultz , Daniel Vetter , Christian Koenig , Sumit Semwal , Liam Mark , Chris Goldsworthy , Laura Abbott , Brian Starkey , Hridya Valsaraju , Suren Baghdasaryan , Sandeep Patil , Daniel Mentz , =?utf-8?q?=C3=98rjan_Eide?= , Robin Murphy , Ezequiel Garcia , Simon Ser , James Jones , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [RFC][PATCH v6 2/7] drm: ttm_pool: Rename the ttm_pool_dma structure to ttm_pool_page_dat Date: Fri, 5 Feb 2021 08:06:16 +0000 Message-Id: <20210205080621.3102035-3-john.stultz@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210205080621.3102035-1-john.stultz@linaro.org> References: <20210205080621.3102035-1-john.stultz@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This patch simply renames the ttm_pool_dma structure to ttm_pool_page_dat, as we will extend it to store more then just dma related info in it. Cc: Daniel Vetter Cc: Christian Koenig Cc: Sumit Semwal Cc: Liam Mark Cc: Chris Goldsworthy Cc: Laura Abbott Cc: Brian Starkey Cc: Hridya Valsaraju Cc: Suren Baghdasaryan Cc: Sandeep Patil Cc: Daniel Mentz Cc: Ørjan Eide Cc: Robin Murphy Cc: Ezequiel Garcia Cc: Simon Ser Cc: James Jones Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Signed-off-by: John Stultz --- drivers/gpu/drm/ttm/ttm_pool.c | 37 +++++++++++++++++----------------- 1 file changed, 18 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c index 11e0313db0ea..c0274e256be3 100644 --- a/drivers/gpu/drm/ttm/ttm_pool.c +++ b/drivers/gpu/drm/ttm/ttm_pool.c @@ -37,18 +37,17 @@ #ifdef CONFIG_X86 #include #endif - #include #include #include /** - * struct ttm_pool_dma - Helper object for coherent DMA mappings + * struct ttm_pool_page_dat - Helper object for coherent DMA mappings * * @addr: original DMA address returned for the mapping * @vaddr: original vaddr return for the mapping and order in the lower bits */ -struct ttm_pool_dma { +struct ttm_pool_page_dat { dma_addr_t addr; unsigned long vaddr; }; @@ -75,7 +74,7 @@ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags, unsigned int order) { unsigned long attr = DMA_ATTR_FORCE_CONTIGUOUS; - struct ttm_pool_dma *dma; + struct ttm_pool_page_dat *dat; struct page *p; void *vaddr; @@ -94,15 +93,15 @@ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags, return p; } - dma = kmalloc(sizeof(*dma), GFP_KERNEL); - if (!dma) + dat = kmalloc(sizeof(*dat), GFP_KERNEL); + if (!dat) return NULL; if (order) attr |= DMA_ATTR_NO_WARN; vaddr = dma_alloc_attrs(pool->dev, (1ULL << order) * PAGE_SIZE, - &dma->addr, gfp_flags, attr); + &dat->addr, gfp_flags, attr); if (!vaddr) goto error_free; @@ -114,12 +113,12 @@ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags, else p = virt_to_page(vaddr); - dma->vaddr = (unsigned long)vaddr | order; - p->private = (unsigned long)dma; + dat->vaddr = (unsigned long)vaddr | order; + p->private = (unsigned long)dat; return p; error_free: - kfree(dma); + kfree(dat); return NULL; } @@ -128,7 +127,7 @@ static void ttm_pool_free_page(struct ttm_pool *pool, enum ttm_caching caching, unsigned int order, struct page *p) { unsigned long attr = DMA_ATTR_FORCE_CONTIGUOUS; - struct ttm_pool_dma *dma; + struct ttm_pool_page_dat *dat; void *vaddr; #ifdef CONFIG_X86 @@ -147,11 +146,11 @@ static void ttm_pool_free_page(struct ttm_pool *pool, enum ttm_caching caching, if (order) attr |= DMA_ATTR_NO_WARN; - dma = (void *)p->private; - vaddr = (void *)(dma->vaddr & PAGE_MASK); - dma_free_attrs(pool->dev, (1UL << order) * PAGE_SIZE, vaddr, dma->addr, + dat = (void *)p->private; + vaddr = (void *)(dat->vaddr & PAGE_MASK); + dma_free_attrs(pool->dev, (1UL << order) * PAGE_SIZE, vaddr, dat->addr, attr); - kfree(dma); + kfree(dat); } /* Apply a new caching to an array of pages */ @@ -184,9 +183,9 @@ static int ttm_pool_map(struct ttm_pool *pool, unsigned int order, unsigned int i; if (pool->use_dma_alloc) { - struct ttm_pool_dma *dma = (void *)p->private; + struct ttm_pool_page_dat *dat = (void *)p->private; - addr = dma->addr; + addr = dat->addr; } else { size_t size = (1ULL << order) * PAGE_SIZE; @@ -324,9 +323,9 @@ static unsigned int ttm_pool_shrink(void) static unsigned int ttm_pool_page_order(struct ttm_pool *pool, struct page *p) { if (pool->use_dma_alloc) { - struct ttm_pool_dma *dma = (void *)p->private; + struct ttm_pool_page_dat *dat = (void *)p->private; - return dma->vaddr & ~PAGE_MASK; + return dat->vaddr & ~PAGE_MASK; } return p->private; From patchwork Fri Feb 5 08:06:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 12069547 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 33AFCC433DB for ; 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Fri, 05 Feb 2021 00:06:30 -0800 (PST) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id 32sm9520070pgq.80.2021.02.05.00.06.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Feb 2021 00:06:30 -0800 (PST) From: John Stultz To: lkml Cc: John Stultz , Daniel Vetter , Christian Koenig , Sumit Semwal , Liam Mark , Chris Goldsworthy , Laura Abbott , Brian Starkey , Hridya Valsaraju , Suren Baghdasaryan , Sandeep Patil , Daniel Mentz , =?utf-8?q?=C3=98rjan_Eide?= , Robin Murphy , Ezequiel Garcia , Simon Ser , James Jones , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [RFC][PATCH v6 3/7] drm: ttm_pool: Rework ttm_pool_free_page to allow us to use it as a function pointer Date: Fri, 5 Feb 2021 08:06:17 +0000 Message-Id: <20210205080621.3102035-4-john.stultz@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210205080621.3102035-1-john.stultz@linaro.org> References: <20210205080621.3102035-1-john.stultz@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This refactors ttm_pool_free_page(), and by adding extra entries to ttm_pool_page_dat, we then use it for all allocations, which allows us to simplify the arguments needed to be passed to ttm_pool_free_page(). This is critical for allowing the free function to be called by the sharable drm_page_pool logic. Cc: Daniel Vetter Cc: Christian Koenig Cc: Sumit Semwal Cc: Liam Mark Cc: Chris Goldsworthy Cc: Laura Abbott Cc: Brian Starkey Cc: Hridya Valsaraju Cc: Suren Baghdasaryan Cc: Sandeep Patil Cc: Daniel Mentz Cc: Ørjan Eide Cc: Robin Murphy Cc: Ezequiel Garcia Cc: Simon Ser Cc: James Jones Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Signed-off-by: John Stultz --- drivers/gpu/drm/ttm/ttm_pool.c | 60 ++++++++++++++++++---------------- 1 file changed, 32 insertions(+), 28 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c index c0274e256be3..eca36678f967 100644 --- a/drivers/gpu/drm/ttm/ttm_pool.c +++ b/drivers/gpu/drm/ttm/ttm_pool.c @@ -44,10 +44,14 @@ /** * struct ttm_pool_page_dat - Helper object for coherent DMA mappings * + * @pool: ttm_pool pointer the page was allocated by + * @caching: the caching value the allocated page was configured for * @addr: original DMA address returned for the mapping * @vaddr: original vaddr return for the mapping and order in the lower bits */ struct ttm_pool_page_dat { + struct ttm_pool *pool; + enum ttm_caching caching; dma_addr_t addr; unsigned long vaddr; }; @@ -71,13 +75,20 @@ static struct shrinker mm_shrinker; /* Allocate pages of size 1 << order with the given gfp_flags */ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags, - unsigned int order) + unsigned int order, enum ttm_caching caching) { unsigned long attr = DMA_ATTR_FORCE_CONTIGUOUS; struct ttm_pool_page_dat *dat; struct page *p; void *vaddr; + dat = kmalloc(sizeof(*dat), GFP_KERNEL); + if (!dat) + return NULL; + + dat->pool = pool; + dat->caching = caching; + /* Don't set the __GFP_COMP flag for higher order allocations. * Mapping pages directly into an userspace process and calling * put_page() on a TTM allocated page is illegal. @@ -88,15 +99,13 @@ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags, if (!pool->use_dma_alloc) { p = alloc_pages(gfp_flags, order); - if (p) - p->private = order; + if (!p) + goto error_free; + dat->vaddr = order; + p->private = (unsigned long)dat; return p; } - dat = kmalloc(sizeof(*dat), GFP_KERNEL); - if (!dat) - return NULL; - if (order) attr |= DMA_ATTR_NO_WARN; @@ -123,34 +132,34 @@ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags, } /* Reset the caching and pages of size 1 << order */ -static void ttm_pool_free_page(struct ttm_pool *pool, enum ttm_caching caching, - unsigned int order, struct page *p) +static int ttm_pool_free_page(struct page *p, unsigned int order) { unsigned long attr = DMA_ATTR_FORCE_CONTIGUOUS; - struct ttm_pool_page_dat *dat; + struct ttm_pool_page_dat *dat = (void *)p->private; void *vaddr; #ifdef CONFIG_X86 /* We don't care that set_pages_wb is inefficient here. This is only * used when we have to shrink and CPU overhead is irrelevant then. */ - if (caching != ttm_cached && !PageHighMem(p)) + if (dat->caching != ttm_cached && !PageHighMem(p)) set_pages_wb(p, 1 << order); #endif - if (!pool || !pool->use_dma_alloc) { + if (!dat->pool || !dat->pool->use_dma_alloc) { __free_pages(p, order); - return; + goto out; } if (order) attr |= DMA_ATTR_NO_WARN; - dat = (void *)p->private; vaddr = (void *)(dat->vaddr & PAGE_MASK); - dma_free_attrs(pool->dev, (1UL << order) * PAGE_SIZE, vaddr, dat->addr, + dma_free_attrs(dat->pool->dev, (1UL << order) * PAGE_SIZE, vaddr, dat->addr, attr); +out: kfree(dat); + return 1 << order; } /* Apply a new caching to an array of pages */ @@ -264,7 +273,7 @@ static void ttm_pool_type_fini(struct ttm_pool_type *pt) mutex_unlock(&shrinker_lock); list_for_each_entry_safe(p, tmp, &pt->pages, lru) - ttm_pool_free_page(pt->pool, pt->caching, pt->order, p); + ttm_pool_free_page(p, pt->order); } /* Return the pool_type to use for the given caching and order */ @@ -307,7 +316,7 @@ static unsigned int ttm_pool_shrink(void) p = ttm_pool_type_take(pt); if (p) { - ttm_pool_free_page(pt->pool, pt->caching, pt->order, p); + ttm_pool_free_page(p, pt->order); num_freed = 1 << pt->order; } else { num_freed = 0; @@ -322,13 +331,9 @@ static unsigned int ttm_pool_shrink(void) /* Return the allocation order based for a page */ static unsigned int ttm_pool_page_order(struct ttm_pool *pool, struct page *p) { - if (pool->use_dma_alloc) { - struct ttm_pool_page_dat *dat = (void *)p->private; - - return dat->vaddr & ~PAGE_MASK; - } + struct ttm_pool_page_dat *dat = (void *)p->private; - return p->private; + return dat->vaddr & ~PAGE_MASK; } /** @@ -379,7 +384,7 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt, if (p) { apply_caching = true; } else { - p = ttm_pool_alloc_page(pool, gfp_flags, order); + p = ttm_pool_alloc_page(pool, gfp_flags, order, tt->caching); if (p && PageHighMem(p)) apply_caching = true; } @@ -428,13 +433,13 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt, ttm_mem_global_free_page(&ttm_mem_glob, p, (1 << order) * PAGE_SIZE); error_free_page: - ttm_pool_free_page(pool, tt->caching, order, p); + ttm_pool_free_page(p, order); error_free_all: num_pages = tt->num_pages - num_pages; for (i = 0; i < num_pages; ) { order = ttm_pool_page_order(pool, tt->pages[i]); - ttm_pool_free_page(pool, tt->caching, order, tt->pages[i]); + ttm_pool_free_page(tt->pages[i], order); i += 1 << order; } @@ -470,8 +475,7 @@ void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt) if (pt) ttm_pool_type_give(pt, tt->pages[i]); else - ttm_pool_free_page(pool, tt->caching, order, - tt->pages[i]); + ttm_pool_free_page(tt->pages[i], order); i += num_pages; } From patchwork Fri Feb 5 08:06:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 12069541 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97708C433DB for ; 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Fri, 05 Feb 2021 00:06:32 -0800 (PST) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id 32sm9520070pgq.80.2021.02.05.00.06.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Feb 2021 00:06:31 -0800 (PST) From: John Stultz To: lkml Cc: John Stultz , Daniel Vetter , Christian Koenig , Sumit Semwal , Liam Mark , Chris Goldsworthy , Laura Abbott , Brian Starkey , Hridya Valsaraju , Suren Baghdasaryan , Sandeep Patil , Daniel Mentz , =?utf-8?q?=C3=98rjan_Eide?= , Robin Murphy , Ezequiel Garcia , Simon Ser , James Jones , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [RFC][PATCH v6 4/7] drm: ttm_pool: Rework ttm_pool to use drm_page_pool Date: Fri, 5 Feb 2021 08:06:18 +0000 Message-Id: <20210205080621.3102035-5-john.stultz@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210205080621.3102035-1-john.stultz@linaro.org> References: <20210205080621.3102035-1-john.stultz@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This patch reworks the ttm_pool logic to utilize the recently added drm_page_pool code. Basically all the ttm_pool_type structures are replaced with drm_page_pool pointers, and since the drm_page_pool logic has its own shrinker, we can remove all of the ttm_pool shrinker logic. NOTE: There is one mismatch in the interfaces I'm not totally happy with. The ttm_pool tracks all of its pooled pages across a number of different pools, and tries to keep this size under the specified page_pool_size value. With the drm_page_pool, there may other users, however there is still one global shrinker list of pools. So we can't easily reduce the ttm pool under the ttm specified size without potentially doing a lot of shrinking to other non-ttm pools. So either we can: 1) Try to split it so each user of drm_page_pools manages its own pool shrinking. 2) Push the max value into the drm_page_pool, and have it manage shrinking to fit under that global max. Then share those size/max values out so the ttm_pool debug output can have more context. I've taken the second path in this patch set, but wanted to call it out so folks could look closely. Thoughts would be greatly appreciated here! Cc: Daniel Vetter Cc: Christian Koenig Cc: Sumit Semwal Cc: Liam Mark Cc: Chris Goldsworthy Cc: Laura Abbott Cc: Brian Starkey Cc: Hridya Valsaraju Cc: Suren Baghdasaryan Cc: Sandeep Patil Cc: Daniel Mentz Cc: Ørjan Eide Cc: Robin Murphy Cc: Ezequiel Garcia Cc: Simon Ser Cc: James Jones Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Signed-off-by: John Stultz --- drivers/gpu/drm/Kconfig | 1 + drivers/gpu/drm/ttm/ttm_pool.c | 199 +++++++-------------------------- include/drm/ttm/ttm_pool.h | 23 +--- 3 files changed, 41 insertions(+), 182 deletions(-) diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index d16bf340ed2e..d427abefabfb 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -181,6 +181,7 @@ config DRM_PAGE_POOL config DRM_TTM tristate depends on DRM && MMU + select DRM_PAGE_POOL help GPU memory management subsystem for devices with multiple GPU memory types. Will be enabled automatically if a device driver diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c index eca36678f967..dbbaf55ca5df 100644 --- a/drivers/gpu/drm/ttm/ttm_pool.c +++ b/drivers/gpu/drm/ttm/ttm_pool.c @@ -37,6 +37,7 @@ #ifdef CONFIG_X86 #include #endif +#include #include #include #include @@ -63,15 +64,13 @@ module_param(page_pool_size, ulong, 0644); static atomic_long_t allocated_pages; -static struct ttm_pool_type global_write_combined[MAX_ORDER]; -static struct ttm_pool_type global_uncached[MAX_ORDER]; +static struct drm_page_pool *global_write_combined[MAX_ORDER]; +static struct drm_page_pool *global_uncached[MAX_ORDER]; -static struct ttm_pool_type global_dma32_write_combined[MAX_ORDER]; -static struct ttm_pool_type global_dma32_uncached[MAX_ORDER]; +static struct drm_page_pool *global_dma32_write_combined[MAX_ORDER]; +static struct drm_page_pool *global_dma32_uncached[MAX_ORDER]; static struct mutex shrinker_lock; -static struct list_head shrinker_list; -static struct shrinker mm_shrinker; /* Allocate pages of size 1 << order with the given gfp_flags */ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags, @@ -223,79 +222,26 @@ static void ttm_pool_unmap(struct ttm_pool *pool, dma_addr_t dma_addr, DMA_BIDIRECTIONAL); } -/* Give pages into a specific pool_type */ -static void ttm_pool_type_give(struct ttm_pool_type *pt, struct page *p) -{ - spin_lock(&pt->lock); - list_add(&p->lru, &pt->pages); - spin_unlock(&pt->lock); - atomic_long_add(1 << pt->order, &allocated_pages); -} - -/* Take pages from a specific pool_type, return NULL when nothing available */ -static struct page *ttm_pool_type_take(struct ttm_pool_type *pt) -{ - struct page *p; - - spin_lock(&pt->lock); - p = list_first_entry_or_null(&pt->pages, typeof(*p), lru); - if (p) { - atomic_long_sub(1 << pt->order, &allocated_pages); - list_del(&p->lru); - } - spin_unlock(&pt->lock); - - return p; -} - -/* Initialize and add a pool type to the global shrinker list */ -static void ttm_pool_type_init(struct ttm_pool_type *pt, struct ttm_pool *pool, - enum ttm_caching caching, unsigned int order) -{ - pt->pool = pool; - pt->caching = caching; - pt->order = order; - spin_lock_init(&pt->lock); - INIT_LIST_HEAD(&pt->pages); - - mutex_lock(&shrinker_lock); - list_add_tail(&pt->shrinker_list, &shrinker_list); - mutex_unlock(&shrinker_lock); -} - -/* Remove a pool_type from the global shrinker list and free all pages */ -static void ttm_pool_type_fini(struct ttm_pool_type *pt) -{ - struct page *p, *tmp; - - mutex_lock(&shrinker_lock); - list_del(&pt->shrinker_list); - mutex_unlock(&shrinker_lock); - - list_for_each_entry_safe(p, tmp, &pt->pages, lru) - ttm_pool_free_page(p, pt->order); -} - /* Return the pool_type to use for the given caching and order */ -static struct ttm_pool_type *ttm_pool_select_type(struct ttm_pool *pool, +static struct drm_page_pool *ttm_pool_select_type(struct ttm_pool *pool, enum ttm_caching caching, unsigned int order) { if (pool->use_dma_alloc) - return &pool->caching[caching].orders[order]; + return pool->caching[caching].orders[order]; #ifdef CONFIG_X86 switch (caching) { case ttm_write_combined: if (pool->use_dma32) - return &global_dma32_write_combined[order]; + return global_dma32_write_combined[order]; - return &global_write_combined[order]; + return global_write_combined[order]; case ttm_uncached: if (pool->use_dma32) - return &global_dma32_uncached[order]; + return global_dma32_uncached[order]; - return &global_uncached[order]; + return global_uncached[order]; default: break; } @@ -304,30 +250,6 @@ static struct ttm_pool_type *ttm_pool_select_type(struct ttm_pool *pool, return NULL; } -/* Free pages using the global shrinker list */ -static unsigned int ttm_pool_shrink(void) -{ - struct ttm_pool_type *pt; - unsigned int num_freed; - struct page *p; - - mutex_lock(&shrinker_lock); - pt = list_first_entry(&shrinker_list, typeof(*pt), shrinker_list); - - p = ttm_pool_type_take(pt); - if (p) { - ttm_pool_free_page(p, pt->order); - num_freed = 1 << pt->order; - } else { - num_freed = 0; - } - - list_move_tail(&pt->shrinker_list, &shrinker_list); - mutex_unlock(&shrinker_lock); - - return num_freed; -} - /* Return the allocation order based for a page */ static unsigned int ttm_pool_page_order(struct ttm_pool *pool, struct page *p) { @@ -377,10 +299,10 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt, for (order = min(MAX_ORDER - 1UL, __fls(num_pages)); num_pages; order = min_t(unsigned int, order, __fls(num_pages))) { bool apply_caching = false; - struct ttm_pool_type *pt; + struct drm_page_pool *pt; pt = ttm_pool_select_type(pool, tt->caching, order); - p = pt ? ttm_pool_type_take(pt) : NULL; + p = pt ? drm_page_pool_fetch(pt) : NULL; if (p) { apply_caching = true; } else { @@ -462,7 +384,7 @@ void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt) for (i = 0; i < tt->num_pages; ) { struct page *p = tt->pages[i]; unsigned int order, num_pages; - struct ttm_pool_type *pt; + struct drm_page_pool *pt; order = ttm_pool_page_order(pool, p); num_pages = 1ULL << order; @@ -473,15 +395,12 @@ void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt) pt = ttm_pool_select_type(pool, tt->caching, order); if (pt) - ttm_pool_type_give(pt, tt->pages[i]); + drm_page_pool_add(pt, tt->pages[i]); else ttm_pool_free_page(tt->pages[i], order); i += num_pages; } - - while (atomic_long_read(&allocated_pages) > page_pool_size) - ttm_pool_shrink(); } EXPORT_SYMBOL(ttm_pool_free); @@ -508,8 +427,8 @@ void ttm_pool_init(struct ttm_pool *pool, struct device *dev, for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i) for (j = 0; j < MAX_ORDER; ++j) - ttm_pool_type_init(&pool->caching[i].orders[j], - pool, i, j); + pool->caching[i].orders[j] = drm_page_pool_create(j, + ttm_pool_free_page); } /** @@ -526,33 +445,18 @@ void ttm_pool_fini(struct ttm_pool *pool) for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i) for (j = 0; j < MAX_ORDER; ++j) - ttm_pool_type_fini(&pool->caching[i].orders[j]); + drm_page_pool_destroy(pool->caching[i].orders[j]); } #ifdef CONFIG_DEBUG_FS -/* Count the number of pages available in a pool_type */ -static unsigned int ttm_pool_type_count(struct ttm_pool_type *pt) -{ - unsigned int count = 0; - struct page *p; - - spin_lock(&pt->lock); - /* Only used for debugfs, the overhead doesn't matter */ - list_for_each_entry(p, &pt->pages, lru) - ++count; - spin_unlock(&pt->lock); - - return count; -} - /* Dump information about the different pool types */ -static void ttm_pool_debugfs_orders(struct ttm_pool_type *pt, +static void ttm_pool_debugfs_orders(struct drm_page_pool **pt, struct seq_file *m) { unsigned int i; for (i = 0; i < MAX_ORDER; ++i) - seq_printf(m, " %8u", ttm_pool_type_count(&pt[i])); + seq_printf(m, " %8u", drm_page_pool_get_size(pt[i])); seq_puts(m, "\n"); } @@ -602,7 +506,10 @@ int ttm_pool_debugfs(struct ttm_pool *pool, struct seq_file *m) } seq_printf(m, "\ntotal\t: %8lu of %8lu\n", - atomic_long_read(&allocated_pages), page_pool_size); + atomic_long_read(&allocated_pages), + drm_page_pool_get_max()); + seq_printf(m, "(%8lu in non-ttm pools)\n", drm_page_pool_get_total() - + atomic_long_read(&allocated_pages)); mutex_unlock(&shrinker_lock); @@ -612,28 +519,6 @@ EXPORT_SYMBOL(ttm_pool_debugfs); #endif -/* As long as pages are available make sure to release at least one */ -static unsigned long ttm_pool_shrinker_scan(struct shrinker *shrink, - struct shrink_control *sc) -{ - unsigned long num_freed = 0; - - do - num_freed += ttm_pool_shrink(); - while (!num_freed && atomic_long_read(&allocated_pages)); - - return num_freed; -} - -/* Return the number of pages available or SHRINK_EMPTY if we have none */ -static unsigned long ttm_pool_shrinker_count(struct shrinker *shrink, - struct shrink_control *sc) -{ - unsigned long num_pages = atomic_long_read(&allocated_pages); - - return num_pages ? num_pages : SHRINK_EMPTY; -} - /** * ttm_pool_mgr_init - Initialize globals * @@ -648,24 +533,21 @@ int ttm_pool_mgr_init(unsigned long num_pages) if (!page_pool_size) page_pool_size = num_pages; + drm_page_pool_set_max(page_pool_size); + mutex_init(&shrinker_lock); - INIT_LIST_HEAD(&shrinker_list); for (i = 0; i < MAX_ORDER; ++i) { - ttm_pool_type_init(&global_write_combined[i], NULL, - ttm_write_combined, i); - ttm_pool_type_init(&global_uncached[i], NULL, ttm_uncached, i); - - ttm_pool_type_init(&global_dma32_write_combined[i], NULL, - ttm_write_combined, i); - ttm_pool_type_init(&global_dma32_uncached[i], NULL, - ttm_uncached, i); + global_write_combined[i] = drm_page_pool_create(i, + ttm_pool_free_page); + global_uncached[i] = drm_page_pool_create(i, + ttm_pool_free_page); + global_dma32_write_combined[i] = drm_page_pool_create(i, + ttm_pool_free_page); + global_dma32_uncached[i] = drm_page_pool_create(i, + ttm_pool_free_page); } - - mm_shrinker.count_objects = ttm_pool_shrinker_count; - mm_shrinker.scan_objects = ttm_pool_shrinker_scan; - mm_shrinker.seeks = 1; - return register_shrinker(&mm_shrinker); + return 0; } /** @@ -678,13 +560,10 @@ void ttm_pool_mgr_fini(void) unsigned int i; for (i = 0; i < MAX_ORDER; ++i) { - ttm_pool_type_fini(&global_write_combined[i]); - ttm_pool_type_fini(&global_uncached[i]); + drm_page_pool_destroy(global_write_combined[i]); + drm_page_pool_destroy(global_uncached[i]); - ttm_pool_type_fini(&global_dma32_write_combined[i]); - ttm_pool_type_fini(&global_dma32_uncached[i]); + drm_page_pool_destroy(global_dma32_write_combined[i]); + drm_page_pool_destroy(global_dma32_uncached[i]); } - - unregister_shrinker(&mm_shrinker); - WARN_ON(!list_empty(&shrinker_list)); } diff --git a/include/drm/ttm/ttm_pool.h b/include/drm/ttm/ttm_pool.h index 4321728bdd11..460ab232fd22 100644 --- a/include/drm/ttm/ttm_pool.h +++ b/include/drm/ttm/ttm_pool.h @@ -36,27 +36,6 @@ struct ttm_tt; struct ttm_pool; struct ttm_operation_ctx; -/** - * ttm_pool_type - Pool for a certain memory type - * - * @pool: the pool we belong to, might be NULL for the global ones - * @order: the allocation order our pages have - * @caching: the caching type our pages have - * @shrinker_list: our place on the global shrinker list - * @lock: protection of the page list - * @pages: the list of pages in the pool - */ -struct ttm_pool_type { - struct ttm_pool *pool; - unsigned int order; - enum ttm_caching caching; - - struct list_head shrinker_list; - - spinlock_t lock; - struct list_head pages; -}; - /** * ttm_pool - Pool for all caching and orders * @@ -71,7 +50,7 @@ struct ttm_pool { bool use_dma32; struct { - struct ttm_pool_type orders[MAX_ORDER]; + struct drm_page_pool *orders[MAX_ORDER]; } caching[TTM_NUM_CACHING_TYPES]; }; From patchwork Fri Feb 5 08:06:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 12069543 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 51945C433DB for ; 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Fri, 05 Feb 2021 00:06:35 -0800 (PST) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id 32sm9520070pgq.80.2021.02.05.00.06.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Feb 2021 00:06:34 -0800 (PST) From: John Stultz To: lkml Cc: John Stultz , Daniel Vetter , Christian Koenig , Sumit Semwal , Liam Mark , Chris Goldsworthy , Laura Abbott , Brian Starkey , Hridya Valsaraju , Suren Baghdasaryan , Sandeep Patil , Daniel Mentz , =?utf-8?q?=C3=98rjan_Eide?= , Robin Murphy , Ezequiel Garcia , Simon Ser , James Jones , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [RFC][PATCH v6 5/7] dma-buf: heaps: Add deferred-free-helper library code Date: Fri, 5 Feb 2021 08:06:19 +0000 Message-Id: <20210205080621.3102035-6-john.stultz@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210205080621.3102035-1-john.stultz@linaro.org> References: <20210205080621.3102035-1-john.stultz@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This patch provides infrastructure for deferring buffer frees. This is a feature ION provided which when used with some form of a page pool, provides a nice performance boost in an allocation microbenchmark. The reason it helps is it allows the page-zeroing to be done out of the normal allocation/free path, and pushed off to a kthread. As not all heaps will find this useful, its implemented as a optional helper library that heaps can utilize. Cc: Daniel Vetter Cc: Christian Koenig Cc: Sumit Semwal Cc: Liam Mark Cc: Chris Goldsworthy Cc: Laura Abbott Cc: Brian Starkey Cc: Hridya Valsaraju Cc: Suren Baghdasaryan Cc: Sandeep Patil Cc: Daniel Mentz Cc: Ørjan Eide Cc: Robin Murphy Cc: Ezequiel Garcia Cc: Simon Ser Cc: James Jones Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Signed-off-by: John Stultz --- v2: * Fix sleep in atomic issue from using a mutex, by switching to a spinlock as Reported-by: kernel test robot * Cleanup API to use a reason enum for clarity and add some documentation comments as suggested by Suren Baghdasaryan. v3: * Minor tweaks so it can be built as a module * A few small fixups suggested by Daniel Mentz v4: * Tweak from Daniel Mentz to make sure the shrinker count/freed values are tracked in pages not bytes v5: * Fix up page count tracking as suggested by Suren Baghdasaryan --- drivers/dma-buf/heaps/Kconfig | 3 + drivers/dma-buf/heaps/Makefile | 1 + drivers/dma-buf/heaps/deferred-free-helper.c | 145 +++++++++++++++++++ drivers/dma-buf/heaps/deferred-free-helper.h | 55 +++++++ 4 files changed, 204 insertions(+) create mode 100644 drivers/dma-buf/heaps/deferred-free-helper.c create mode 100644 drivers/dma-buf/heaps/deferred-free-helper.h diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig index a5eef06c4226..f7aef8bc7119 100644 --- a/drivers/dma-buf/heaps/Kconfig +++ b/drivers/dma-buf/heaps/Kconfig @@ -1,3 +1,6 @@ +config DMABUF_HEAPS_DEFERRED_FREE + tristate + config DMABUF_HEAPS_SYSTEM bool "DMA-BUF System Heap" depends on DMABUF_HEAPS diff --git a/drivers/dma-buf/heaps/Makefile b/drivers/dma-buf/heaps/Makefile index 974467791032..4e7839875615 100644 --- a/drivers/dma-buf/heaps/Makefile +++ b/drivers/dma-buf/heaps/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_DMABUF_HEAPS_DEFERRED_FREE) += deferred-free-helper.o obj-$(CONFIG_DMABUF_HEAPS_SYSTEM) += system_heap.o obj-$(CONFIG_DMABUF_HEAPS_CMA) += cma_heap.o diff --git a/drivers/dma-buf/heaps/deferred-free-helper.c b/drivers/dma-buf/heaps/deferred-free-helper.c new file mode 100644 index 000000000000..672c3d5872e9 --- /dev/null +++ b/drivers/dma-buf/heaps/deferred-free-helper.c @@ -0,0 +1,145 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Deferred dmabuf freeing helper + * + * Copyright (C) 2020 Linaro, Ltd. + * + * Based on the ION page pool code + * Copyright (C) 2011 Google, Inc. + */ + +#include +#include +#include +#include +#include + +#include "deferred-free-helper.h" + +static LIST_HEAD(free_list); +static size_t list_size_pages; +wait_queue_head_t freelist_waitqueue; +struct task_struct *freelist_task; +static DEFINE_SPINLOCK(free_list_lock); + +static inline size_t size_to_pages(size_t size) +{ + if (!size) + return 0; + return ((size - 1) >> PAGE_SHIFT) + 1; +} + +void deferred_free(struct deferred_freelist_item *item, + void (*free)(struct deferred_freelist_item*, + enum df_reason), + size_t size) +{ + unsigned long flags; + + INIT_LIST_HEAD(&item->list); + item->size = size; + item->free = free; + + spin_lock_irqsave(&free_list_lock, flags); + list_add(&item->list, &free_list); + list_size_pages += size_to_pages(size); + spin_unlock_irqrestore(&free_list_lock, flags); + wake_up(&freelist_waitqueue); +} +EXPORT_SYMBOL_GPL(deferred_free); + +static size_t free_one_item(enum df_reason reason) +{ + unsigned long flags; + size_t nr_pages; + struct deferred_freelist_item *item; + + spin_lock_irqsave(&free_list_lock, flags); + if (list_empty(&free_list)) { + spin_unlock_irqrestore(&free_list_lock, flags); + return 0; + } + item = list_first_entry(&free_list, struct deferred_freelist_item, list); + list_del(&item->list); + nr_pages = size_to_pages(item->size); + list_size_pages -= nr_pages; + spin_unlock_irqrestore(&free_list_lock, flags); + + item->free(item, reason); + return nr_pages; +} + +static unsigned long get_freelist_size_pages(void) +{ + unsigned long size; + unsigned long flags; + + spin_lock_irqsave(&free_list_lock, flags); + size = list_size_pages; + spin_unlock_irqrestore(&free_list_lock, flags); + return size; +} + +static unsigned long freelist_shrink_count(struct shrinker *shrinker, + struct shrink_control *sc) +{ + return get_freelist_size_pages(); +} + +static unsigned long freelist_shrink_scan(struct shrinker *shrinker, + struct shrink_control *sc) +{ + unsigned long total_freed = 0; + + if (sc->nr_to_scan == 0) + return 0; + + while (total_freed < sc->nr_to_scan) { + size_t pages_freed = free_one_item(DF_UNDER_PRESSURE); + + if (!pages_freed) + break; + + total_freed += pages_freed; + } + + return total_freed; +} + +static struct shrinker freelist_shrinker = { + .count_objects = freelist_shrink_count, + .scan_objects = freelist_shrink_scan, + .seeks = DEFAULT_SEEKS, + .batch = 0, +}; + +static int deferred_free_thread(void *data) +{ + while (true) { + wait_event_freezable(freelist_waitqueue, + get_freelist_size_pages() > 0); + + free_one_item(DF_NORMAL); + } + + return 0; +} + +static int deferred_freelist_init(void) +{ + list_size_pages = 0; + + init_waitqueue_head(&freelist_waitqueue); + freelist_task = kthread_run(deferred_free_thread, NULL, + "%s", "dmabuf-deferred-free-worker"); + if (IS_ERR(freelist_task)) { + pr_err("Creating thread for deferred free failed\n"); + return -1; + } + sched_set_normal(freelist_task, 19); + + return register_shrinker(&freelist_shrinker); +} +module_init(deferred_freelist_init); +MODULE_LICENSE("GPL v2"); + diff --git a/drivers/dma-buf/heaps/deferred-free-helper.h b/drivers/dma-buf/heaps/deferred-free-helper.h new file mode 100644 index 000000000000..18b44ac86ef6 --- /dev/null +++ b/drivers/dma-buf/heaps/deferred-free-helper.h @@ -0,0 +1,55 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef DEFERRED_FREE_HELPER_H +#define DEFERRED_FREE_HELPER_H + +/** + * df_reason - enum for reason why item was freed + * + * This provides a reason for why the free function was called + * on the item. This is useful when deferred_free is used in + * combination with a pagepool, so under pressure the page can + * be immediately freed. + * + * DF_NORMAL: Normal deferred free + * + * DF_UNDER_PRESSURE: Free was called because the system + * is under memory pressure. Usually + * from a shrinker. Avoid allocating + * memory in the free call, as it may + * fail. + */ +enum df_reason { + DF_NORMAL, + DF_UNDER_PRESSURE, +}; + +/** + * deferred_freelist_item - item structure for deferred freelist + * + * This is to be added to the structure for whatever you want to + * defer freeing on. + * + * @size: size of the item to be freed + * @free: function pointer to be called when freeing the item + * @list: list entry for the deferred list + */ +struct deferred_freelist_item { + size_t size; + void (*free)(struct deferred_freelist_item *i, + enum df_reason reason); + struct list_head list; +}; + +/** + * deferred_free - call to add item to the deferred free list + * + * @item: Pointer to deferred_freelist_item field of a structure + * @free: Function pointer to the free call + * @size: Size of the item to be freed + */ +void deferred_free(struct deferred_freelist_item *item, + void (*free)(struct deferred_freelist_item *i, + enum df_reason reason), + size_t size); +#endif From patchwork Fri Feb 5 08:06:20 2021 Content-Type: text/plain; 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Fri, 05 Feb 2021 00:06:36 -0800 (PST) From: John Stultz To: lkml Cc: John Stultz , Daniel Vetter , Christian Koenig , Sumit Semwal , Liam Mark , Chris Goldsworthy , Laura Abbott , Brian Starkey , Hridya Valsaraju , Suren Baghdasaryan , Sandeep Patil , Daniel Mentz , =?utf-8?q?=C3=98rjan_Eide?= , Robin Murphy , Ezequiel Garcia , Simon Ser , James Jones , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [RFC][PATCH v6 6/7] dma-buf: system_heap: Add drm pagepool support to system heap Date: Fri, 5 Feb 2021 08:06:20 +0000 Message-Id: <20210205080621.3102035-7-john.stultz@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210205080621.3102035-1-john.stultz@linaro.org> References: <20210205080621.3102035-1-john.stultz@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Utilize the drm pagepool code to speed up allocation performance. This is similar to the ION pagepool usage, but tries to utilize generic code instead of a custom implementation. Cc: Daniel Vetter Cc: Christian Koenig Cc: Sumit Semwal Cc: Liam Mark Cc: Chris Goldsworthy Cc: Laura Abbott Cc: Brian Starkey Cc: Hridya Valsaraju Cc: Suren Baghdasaryan Cc: Sandeep Patil Cc: Daniel Mentz Cc: Ørjan Eide Cc: Robin Murphy Cc: Ezequiel Garcia Cc: Simon Ser Cc: James Jones Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Signed-off-by: John Stultz --- v2: * Fix build issue caused by selecting PAGE_POOL w/o NET as Reported-by: kernel test robot v3: * Simplify the page zeroing logic a bit by using kmap_atomic instead of vmap as suggested by Daniel Mentz v5: * Shift away from networking page pool completely to dmabuf page pool implementation v6: * Switch again to using the drm_page_pool code shared w/ ttm_pool --- drivers/dma-buf/heaps/Kconfig | 1 + drivers/dma-buf/heaps/system_heap.c | 56 +++++++++++++++++++++++++++-- 2 files changed, 54 insertions(+), 3 deletions(-) diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig index f7aef8bc7119..7e28934e0def 100644 --- a/drivers/dma-buf/heaps/Kconfig +++ b/drivers/dma-buf/heaps/Kconfig @@ -4,6 +4,7 @@ config DMABUF_HEAPS_DEFERRED_FREE config DMABUF_HEAPS_SYSTEM bool "DMA-BUF System Heap" depends on DMABUF_HEAPS + select DRM_PAGE_POOL help Choose this option to enable the system dmabuf heap. The system heap is backed by pages from the buddy allocator. If in doubt, say Y. diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c index 17e0e9a68baf..6d39e9f32e36 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -21,6 +21,8 @@ #include #include +#include + static struct dma_heap *sys_heap; struct system_heap_buffer { @@ -53,6 +55,7 @@ static gfp_t order_flags[] = {HIGH_ORDER_GFP, LOW_ORDER_GFP, LOW_ORDER_GFP}; */ static const unsigned int orders[] = {8, 4, 0}; #define NUM_ORDERS ARRAY_SIZE(orders) +struct drm_page_pool *pools[NUM_ORDERS]; static struct sg_table *dup_sg_table(struct sg_table *table) { @@ -281,18 +284,49 @@ static void system_heap_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map) dma_buf_map_clear(map); } +static int system_heap_free_pages(struct page *p, unsigned int order) +{ + __free_pages(p, order); + return 1 << order; +} + +static int system_heap_zero_buffer(struct system_heap_buffer *buffer) +{ + struct sg_table *sgt = &buffer->sg_table; + struct sg_page_iter piter; + struct page *p; + void *vaddr; + int ret = 0; + + for_each_sgtable_page(sgt, &piter, 0) { + p = sg_page_iter_page(&piter); + vaddr = kmap_atomic(p); + memset(vaddr, 0, PAGE_SIZE); + kunmap_atomic(vaddr); + } + + return ret; +} + static void system_heap_dma_buf_release(struct dma_buf *dmabuf) { struct system_heap_buffer *buffer = dmabuf->priv; struct sg_table *table; struct scatterlist *sg; - int i; + int i, j; + + /* Zero the buffer pages before adding back to the pool */ + system_heap_zero_buffer(buffer); table = &buffer->sg_table; for_each_sg(table->sgl, sg, table->nents, i) { struct page *page = sg_page(sg); - __free_pages(page, compound_order(page)); + for (j = 0; j < NUM_ORDERS; j++) { + if (compound_order(page) == orders[j]) + break; + } + drm_page_pool_add(pools[j], page); } sg_free_table(table); kfree(buffer); @@ -323,7 +357,9 @@ static struct page *alloc_largest_available(unsigned long size, if (max_order < orders[i]) continue; - page = alloc_pages(order_flags[i], orders[i]); + page = drm_page_pool_fetch(pools[i]); + if (!page) + page = alloc_pages(order_flags[i], orders[i]); if (!page) continue; return page; @@ -428,6 +464,20 @@ static const struct dma_heap_ops system_heap_ops = { static int system_heap_create(void) { struct dma_heap_export_info exp_info; + int i; + + for (i = 0; i < NUM_ORDERS; i++) { + pools[i] = drm_page_pool_create(orders[i], + system_heap_free_pages); + if (IS_ERR(pools[i])) { + int j; + + pr_err("%s: page pool creation failed!\n", __func__); + for (j = 0; j < i; j++) + drm_page_pool_destroy(pools[j]); + return PTR_ERR(pools[i]); + } + } exp_info.name = "system"; exp_info.ops = &system_heap_ops; From patchwork Fri Feb 5 08:06:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 12069549 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 792A1C433E6 for ; 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Fri, 05 Feb 2021 00:06:39 -0800 (PST) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id 32sm9520070pgq.80.2021.02.05.00.06.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Feb 2021 00:06:38 -0800 (PST) From: John Stultz To: lkml Cc: John Stultz , Daniel Vetter , Christian Koenig , Sumit Semwal , Liam Mark , Chris Goldsworthy , Laura Abbott , Brian Starkey , Hridya Valsaraju , Suren Baghdasaryan , Sandeep Patil , Daniel Mentz , =?utf-8?q?=C3=98rjan_Eide?= , Robin Murphy , Ezequiel Garcia , Simon Ser , James Jones , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [RFC][PATCH v6 7/7] dma-buf: system_heap: Add deferred freeing to the system heap Date: Fri, 5 Feb 2021 08:06:21 +0000 Message-Id: <20210205080621.3102035-8-john.stultz@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210205080621.3102035-1-john.stultz@linaro.org> References: <20210205080621.3102035-1-john.stultz@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Utilize the deferred free helper library in the system heap. This provides a nice performance bump and puts the system heap performance on par with ION. Cc: Daniel Vetter Cc: Christian Koenig Cc: Sumit Semwal Cc: Liam Mark Cc: Chris Goldsworthy Cc: Laura Abbott Cc: Brian Starkey Cc: Hridya Valsaraju Cc: Suren Baghdasaryan Cc: Sandeep Patil Cc: Daniel Mentz Cc: Ørjan Eide Cc: Robin Murphy Cc: Ezequiel Garcia Cc: Simon Ser Cc: James Jones Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Signed-off-by: John Stultz --- v2: * Rework deferred-free api to use reason enum as suggested by Suren Baghdasaryan --- drivers/dma-buf/heaps/Kconfig | 1 + drivers/dma-buf/heaps/system_heap.c | 31 ++++++++++++++++++++++------- 2 files changed, 25 insertions(+), 7 deletions(-) diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig index 7e28934e0def..10632ccfb4a5 100644 --- a/drivers/dma-buf/heaps/Kconfig +++ b/drivers/dma-buf/heaps/Kconfig @@ -5,6 +5,7 @@ config DMABUF_HEAPS_SYSTEM bool "DMA-BUF System Heap" depends on DMABUF_HEAPS select DRM_PAGE_POOL + select DMABUF_HEAPS_DEFERRED_FREE help Choose this option to enable the system dmabuf heap. The system heap is backed by pages from the buddy allocator. If in doubt, say Y. diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c index 6d39e9f32e36..042244407db5 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -22,6 +22,7 @@ #include #include +#include "deferred-free-helper.h" static struct dma_heap *sys_heap; @@ -33,6 +34,7 @@ struct system_heap_buffer { struct sg_table sg_table; int vmap_cnt; void *vaddr; + struct deferred_freelist_item deferred_free; }; struct dma_heap_attachment { @@ -308,30 +310,45 @@ static int system_heap_zero_buffer(struct system_heap_buffer *buffer) return ret; } -static void system_heap_dma_buf_release(struct dma_buf *dmabuf) +static void system_heap_buf_free(struct deferred_freelist_item *item, + enum df_reason reason) { - struct system_heap_buffer *buffer = dmabuf->priv; + struct system_heap_buffer *buffer; struct sg_table *table; struct scatterlist *sg; int i, j; + buffer = container_of(item, struct system_heap_buffer, deferred_free); /* Zero the buffer pages before adding back to the pool */ - system_heap_zero_buffer(buffer); + if (reason == DF_NORMAL) + if (system_heap_zero_buffer(buffer)) + reason = DF_UNDER_PRESSURE; // On failure, just free table = &buffer->sg_table; for_each_sg(table->sgl, sg, table->nents, i) { struct page *page = sg_page(sg); - for (j = 0; j < NUM_ORDERS; j++) { - if (compound_order(page) == orders[j]) - break; + if (reason == DF_UNDER_PRESSURE) { + __free_pages(page, compound_order(page)); + } else { + for (j = 0; j < NUM_ORDERS; j++) { + if (compound_order(page) == orders[j]) + break; + } + drm_page_pool_add(pools[j], page); } - drm_page_pool_add(pools[j], page); } sg_free_table(table); kfree(buffer); } +static void system_heap_dma_buf_release(struct dma_buf *dmabuf) +{ + struct system_heap_buffer *buffer = dmabuf->priv; + + deferred_free(&buffer->deferred_free, system_heap_buf_free, buffer->len); +} + static const struct dma_buf_ops system_heap_buf_ops = { .attach = system_heap_attach, .detach = system_heap_detach,