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Thu, 03 Sep 2020 03:02:18 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0832tGF5175846; Thu, 3 Sep 2020 03:02:17 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3030.oracle.com with ESMTP id 3380kr1e6r-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 03 Sep 2020 03:02:17 +0000 Received: from abhmp0020.oracle.com (abhmp0020.oracle.com [141.146.116.26]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 08332CPZ032089; Thu, 3 Sep 2020 03:02:12 GMT Received: from monkey.oracle.com (/50.38.35.18) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 02 Sep 2020 20:02:11 -0700 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org Subject: [RFC PATCH] cma: make number of CMA areas dynamic, remove CONFIG_CMA_AREAS Date: Wed, 2 Sep 2020 20:02:04 -0700 Message-Id: <20200903030204.253433-1-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.25.4 MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9732 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 spamscore=0 adultscore=0 mlxscore=0 suspectscore=0 malwarescore=0 mlxlogscore=999 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009030027 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9732 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 clxscore=1011 priorityscore=1501 lowpriorityscore=0 malwarescore=0 adultscore=0 spamscore=0 mlxscore=0 phishscore=0 impostorscore=0 mlxlogscore=999 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009030027 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200902_230239_915775_36CBB884 X-CRM114-Status: GOOD ( 33.81 ) X-Spam-Score: -2.5 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.5 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [156.151.31.86 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.0 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [156.151.31.86 listed in wl.mailspike.net] -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Barry Song , Aslan Bakirov , Joonsoo Kim , Rik van Riel , Michal Hocko , Andrew Morton , Roman Gushchin , Mike Kravetz Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org The number of distinct CMA areas is limited by the constant CONFIG_CMA_AREAS. In most environments, this was set to a default value of 7. Not too long ago, support was added to allocate hugetlb gigantic pages from CMA. More recent changes to make dma_alloc_coherent NUMA-aware on arm64 added more potential users of CMA areas. Along with the dma_alloc_coherent changes, the default value of CMA_AREAS was bumped up to 19 if NUMA is enabled. It seems that the number of CMA users is likely to grow. Instead of using a static array for cma areas, use a simple linked list. These areas are used before normal memory allocators, so use the memblock allocator. Signed-off-by: Mike Kravetz Acked-by: Roman Gushchin --- arch/arm/mm/dma-mapping.c | 29 ++++++++++++------- arch/mips/configs/cu1000-neo_defconfig | 1 - arch/mips/configs/cu1830-neo_defconfig | 1 - include/linux/cma.h | 12 -------- mm/Kconfig | 12 -------- mm/cma.c | 40 +++++++++++++------------- mm/cma.h | 4 +-- mm/cma_debug.c | 6 ++-- 8 files changed, 44 insertions(+), 61 deletions(-) diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 8a8949174b1c..a35a760cc0f4 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -383,25 +383,34 @@ postcore_initcall(atomic_pool_init); struct dma_contig_early_reserve { phys_addr_t base; unsigned long size; + struct list_head areas; }; -static struct dma_contig_early_reserve dma_mmu_remap[MAX_CMA_AREAS] __initdata; - -static int dma_mmu_remap_num __initdata; +static __initdata LIST_HEAD(dma_mmu_remap_areas); void __init dma_contiguous_early_fixup(phys_addr_t base, unsigned long size) { - dma_mmu_remap[dma_mmu_remap_num].base = base; - dma_mmu_remap[dma_mmu_remap_num].size = size; - dma_mmu_remap_num++; + struct dma_contig_early_reserve *d; + + d = memblock_alloc(sizeof(struct dma_contig_early_reserve), + sizeof(void *)); + if (!d) { + pr_err("Unable to allocate dma_contig_early_reserve struct!\n"); + return; + } + + d->base = base; + d->size = size; + list_add_tail(&d->areas, &dma_mmu_remap_areas); } void __init dma_contiguous_remap(void) { - int i; - for (i = 0; i < dma_mmu_remap_num; i++) { - phys_addr_t start = dma_mmu_remap[i].base; - phys_addr_t end = start + dma_mmu_remap[i].size; + struct dma_contig_early_reserve *d; + + list_for_each_entry(d, &dma_mmu_remap_areas, areas) { + phys_addr_t start = d->base; + phys_addr_t end = start + d->size; struct map_desc map; unsigned long addr; diff --git a/arch/mips/configs/cu1000-neo_defconfig b/arch/mips/configs/cu1000-neo_defconfig index e924c817f73d..b86f3fd420f2 100644 --- a/arch/mips/configs/cu1000-neo_defconfig +++ b/arch/mips/configs/cu1000-neo_defconfig @@ -31,7 +31,6 @@ CONFIG_HZ_100=y # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set # CONFIG_COMPACTION is not set CONFIG_CMA=y -CONFIG_CMA_AREAS=7 CONFIG_NET=y CONFIG_PACKET=y CONFIG_UNIX=y diff --git a/arch/mips/configs/cu1830-neo_defconfig b/arch/mips/configs/cu1830-neo_defconfig index cbfb62900273..98a31334fc57 100644 --- a/arch/mips/configs/cu1830-neo_defconfig +++ b/arch/mips/configs/cu1830-neo_defconfig @@ -31,7 +31,6 @@ CONFIG_HZ_100=y # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set # CONFIG_COMPACTION is not set CONFIG_CMA=y -CONFIG_CMA_AREAS=7 CONFIG_NET=y CONFIG_PACKET=y CONFIG_UNIX=y diff --git a/include/linux/cma.h b/include/linux/cma.h index 217999c8a762..ea9a3dab0c20 100644 --- a/include/linux/cma.h +++ b/include/linux/cma.h @@ -6,18 +6,6 @@ #include #include -/* - * There is always at least global CMA area and a few optional - * areas configured in kernel .config. - */ -#ifdef CONFIG_CMA_AREAS -#define MAX_CMA_AREAS (1 + CONFIG_CMA_AREAS) - -#else -#define MAX_CMA_AREAS (0) - -#endif - #define CMA_MAX_NAME 64 struct cma; diff --git a/mm/Kconfig b/mm/Kconfig index 7d56281ff41e..a52345093f4d 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -513,18 +513,6 @@ config CMA_DEBUGFS help Turns on the DebugFS interface for CMA. -config CMA_AREAS - int "Maximum count of the CMA areas" - depends on CMA - default 19 if NUMA - default 7 - help - CMA allows to create CMA areas for particular purpose, mainly, - used as device private area. This parameter sets the maximum - number of CMA area in the system. - - If unsure, leave the default value "7" in UMA and "19" in NUMA. - config MEM_SOFT_DIRTY bool "Track memory changes" depends on CHECKPOINT_RESTORE && HAVE_ARCH_SOFT_DIRTY && PROC_FS diff --git a/mm/cma.c b/mm/cma.c index 7f415d7cda9f..2bd61137b2ca 100644 --- a/mm/cma.c +++ b/mm/cma.c @@ -36,8 +36,9 @@ #include "cma.h" -struct cma cma_areas[MAX_CMA_AREAS]; -unsigned cma_area_count; +/* modify here */ +LIST_HEAD(cma_areas); +static unsigned int cma_area_count; static DEFINE_MUTEX(cma_mutex); phys_addr_t cma_get_base(const struct cma *cma) @@ -143,10 +144,10 @@ static void __init cma_activate_area(struct cma *cma) static int __init cma_init_reserved_areas(void) { - int i; + struct cma *c; - for (i = 0; i < cma_area_count; i++) - cma_activate_area(&cma_areas[i]); + list_for_each_entry(c, &cma_areas, areas) + cma_activate_area(c); return 0; } @@ -172,15 +173,14 @@ int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, struct cma *cma; phys_addr_t alignment; - /* Sanity checks */ - if (cma_area_count == ARRAY_SIZE(cma_areas)) { - pr_err("Not enough slots for CMA reserved regions!\n"); - return -ENOSPC; - } + /* Do not attempt allocations after memblock allocator is torn down */ + if (slab_is_available()) + return -EINVAL; if (!size || !memblock_is_region_reserved(base, size)) return -EINVAL; + /* ensure minimal alignment required by mm core */ alignment = PAGE_SIZE << max_t(unsigned long, MAX_ORDER - 1, pageblock_order); @@ -192,12 +192,17 @@ int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, if (ALIGN(base, alignment) != base || ALIGN(size, alignment) != size) return -EINVAL; + cma = memblock_alloc(sizeof(struct cma), sizeof(long)); + if (!cma) { + pr_err("Unable to allocate CMA descriptor!\n"); + return -ENOSPC; + } + list_add_tail(&cma->areas, &cma_areas); + /* * Each reserved area must be initialised later, when more kernel * subsystems (like slab allocator) are available. */ - cma = &cma_areas[cma_area_count]; - if (name) snprintf(cma->name, CMA_MAX_NAME, name); else @@ -253,11 +258,6 @@ int __init cma_declare_contiguous_nid(phys_addr_t base, pr_debug("%s(size %pa, base %pa, limit %pa alignment %pa)\n", __func__, &size, &base, &limit, &alignment); - if (cma_area_count == ARRAY_SIZE(cma_areas)) { - pr_err("Not enough slots for CMA reserved regions!\n"); - return -ENOSPC; - } - if (!size) return -EINVAL; @@ -530,10 +530,10 @@ bool cma_release(struct cma *cma, const struct page *pages, unsigned int count) int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data) { - int i; + struct cma *c; - for (i = 0; i < cma_area_count; i++) { - int ret = it(&cma_areas[i], data); + list_for_each_entry(c, &cma_areas, areas) { + int ret = it(c, data); if (ret) return ret; diff --git a/mm/cma.h b/mm/cma.h index 42ae082cb067..fed800b63819 100644 --- a/mm/cma.h +++ b/mm/cma.h @@ -15,11 +15,11 @@ struct cma { spinlock_t mem_head_lock; struct debugfs_u32_array dfs_bitmap; #endif + struct list_head areas; char name[CMA_MAX_NAME]; }; -extern struct cma cma_areas[MAX_CMA_AREAS]; -extern unsigned cma_area_count; +extern struct list_head cma_areas; static inline unsigned long cma_bitmap_maxno(struct cma *cma) { diff --git a/mm/cma_debug.c b/mm/cma_debug.c index d5bf8aa34fdc..c39695d50224 100644 --- a/mm/cma_debug.c +++ b/mm/cma_debug.c @@ -188,12 +188,12 @@ static void cma_debugfs_add_one(struct cma *cma, struct dentry *root_dentry) static int __init cma_debugfs_init(void) { struct dentry *cma_debugfs_root; - int i; + struct cma *c; cma_debugfs_root = debugfs_create_dir("cma", NULL); - for (i = 0; i < cma_area_count; i++) - cma_debugfs_add_one(&cma_areas[i], cma_debugfs_root); + list_for_each_entry(c, &cma_areas, areas) + cma_debugfs_add_one(c, cma_debugfs_root); return 0; }