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AJvYcCUovLVW31vwt2Iic4ObT5PcsnowH5s8IYM4Pagal83VCDEaquCtPR/gLBoBm3mjvM4FpBWvr3bokQ==@kvack.org X-Gm-Message-State: AOJu0Yw9ncEBEAgcEI6xZBUZ1Lpk6g3apc/MgX2Y8dcKjx7KjwYnYXiQ FkOQCyTewTZPVA7ku990xrbFFvGTHsb58Uk1eDhEJjvkfI7fWW8QsgpOtY2Pfe6Xsg3oYUpRu39 jXQ== X-Google-Smtp-Source: AGHT+IFIgtoncBq9NM/3xD7Imlcbq1xmz7ZhqdBzB7CyCMtuFxcwQyRcHUOe3EsR477ZgjHZHfVYEHABcPU= X-Received: from plbkj16.prod.google.com ([2002:a17:903:6d0:b0:220:ecac:27e5]) (user=surenb job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:e888:b0:223:35cb:e421 with SMTP id d9443c01a7336-22780e258cemr2827355ad.49.1742492380069; Thu, 20 Mar 2025 10:39:40 -0700 (PDT) Date: Thu, 20 Mar 2025 10:39:31 -0700 In-Reply-To: <20250320173931.1583800-1-surenb@google.com> Mime-Version: 1.0 References: <20250320173931.1583800-1-surenb@google.com> X-Mailer: git-send-email 2.49.0.395.g12beb8f557-goog Message-ID: <20250320173931.1583800-4-surenb@google.com> Subject: [RFC 3/3] mm: integrate GCMA with CMA using dt-bindings From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: willy@infradead.org, david@redhat.com, vbabka@suse.cz, lorenzo.stoakes@oracle.com, liam.howlett@oracle.com, alexandru.elisei@arm.com, peterx@redhat.com, hannes@cmpxchg.org, mhocko@kernel.org, m.szyprowski@samsung.com, iamjoonsoo.kim@lge.com, mina86@mina86.com, axboe@kernel.dk, viro@zeniv.linux.org.uk, brauner@kernel.org, hch@infradead.org, jack@suse.cz, hbathini@linux.ibm.com, sourabhjain@linux.ibm.com, ritesh.list@gmail.com, aneesh.kumar@kernel.org, bhelgaas@google.com, sj@kernel.org, fvdl@google.com, ziy@nvidia.com, yuzhao@google.com, minchan@kernel.org, surenb@google.com, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Minchan Kim X-Rspam-User: X-Rspamd-Queue-Id: 33982A0003 X-Stat-Signature: is4p9e8tgj8tj5si9hmjqmjnmdkuqpgh X-Rspamd-Server: rspam06 X-HE-Tag: 1742492380-628271 X-HE-Meta: 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 jfWjPJby 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This patch introduces a new "guarantee" property for shared-dma-pool. With this property, admin can create specific memory pool as GCMA-based CMA if they care about allocation success rate and latency. The downside of GCMA is that it can host only clean file-backed pages since it's using cleancache as its secondary user. Signed-off-by: Minchan Kim Signed-off-by: Suren Baghdasaryan --- arch/powerpc/kernel/fadump.c | 2 +- include/linux/cma.h | 2 +- kernel/dma/contiguous.c | 11 ++++++++++- mm/cma.c | 33 ++++++++++++++++++++++++++------- mm/cma.h | 1 + mm/cma_sysfs.c | 10 ++++++++++ 6 files changed, 49 insertions(+), 10 deletions(-) diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index 4b371c738213..4eb7be0cdcdb 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -111,7 +111,7 @@ void __init fadump_cma_init(void) return; } - rc = cma_init_reserved_mem(base, size, 0, "fadump_cma", &fadump_cma); + rc = cma_init_reserved_mem(base, size, 0, "fadump_cma", &fadump_cma, false); if (rc) { pr_err("Failed to init cma area for firmware-assisted dump,%d\n", rc); /* diff --git a/include/linux/cma.h b/include/linux/cma.h index 62d9c1cf6326..3207db979e94 100644 --- a/include/linux/cma.h +++ b/include/linux/cma.h @@ -46,7 +46,7 @@ extern int __init cma_declare_contiguous_multi(phys_addr_t size, extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, unsigned int order_per_bit, const char *name, - struct cma **res_cma); + struct cma **res_cma, bool gcma); extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align, bool no_warn); extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count); diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c index 055da410ac71..a68b3123438c 100644 --- a/kernel/dma/contiguous.c +++ b/kernel/dma/contiguous.c @@ -459,6 +459,7 @@ static int __init rmem_cma_setup(struct reserved_mem *rmem) unsigned long node = rmem->fdt_node; bool default_cma = of_get_flat_dt_prop(node, "linux,cma-default", NULL); struct cma *cma; + bool gcma; int err; if (size_cmdline != -1 && default_cma) { @@ -476,7 +477,15 @@ static int __init rmem_cma_setup(struct reserved_mem *rmem) return -EINVAL; } - err = cma_init_reserved_mem(rmem->base, rmem->size, 0, rmem->name, &cma); + gcma = !!of_get_flat_dt_prop(node, "guarantee", NULL); +#ifndef CONFIG_GCMA + if (gcma) { + pr_err("Reserved memory: unable to setup GCMA region, GCMA is not enabled\n"); + return -EINVAL; + } +#endif + err = cma_init_reserved_mem(rmem->base, rmem->size, 0, rmem->name, + &cma, gcma); if (err) { pr_err("Reserved memory: unable to setup CMA region\n"); return err; diff --git a/mm/cma.c b/mm/cma.c index b06d5fe73399..f12cef849e58 100644 --- a/mm/cma.c +++ b/mm/cma.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include @@ -165,11 +166,18 @@ static void __init cma_activate_area(struct cma *cma) count = cmr->early_pfn - cmr->base_pfn; bitmap_count = cma_bitmap_pages_to_bits(cma, count); bitmap_set(cmr->bitmap, 0, bitmap_count); + } else { + count = 0; } - for (pfn = cmr->early_pfn; pfn < cmr->base_pfn + cmr->count; - pfn += pageblock_nr_pages) - init_cma_reserved_pageblock(pfn_to_page(pfn)); + if (cma->gcma) { + gcma_register_area(cma->name, cmr->early_pfn, + cma->count - count); + } else { + for (pfn = cmr->early_pfn; pfn < cmr->base_pfn + cmr->count; + pfn += pageblock_nr_pages) + init_cma_reserved_pageblock(pfn_to_page(pfn)); + } } spin_lock_init(&cma->lock); @@ -270,7 +278,7 @@ static void __init cma_drop_area(struct cma *cma) int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, unsigned int order_per_bit, const char *name, - struct cma **res_cma) + struct cma **res_cma, bool gcma) { struct cma *cma; int ret; @@ -301,6 +309,7 @@ int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, cma->ranges[0].count = cma->count; cma->nranges = 1; cma->nid = NUMA_NO_NODE; + cma->gcma = gcma; *res_cma = cma; @@ -721,7 +730,8 @@ static int __init __cma_declare_contiguous_nid(phys_addr_t base, base = addr; } - ret = cma_init_reserved_mem(base, size, order_per_bit, name, res_cma); + ret = cma_init_reserved_mem(base, size, order_per_bit, name, res_cma, + false); if (ret) memblock_phys_free(base, size); @@ -815,7 +825,13 @@ static int cma_range_alloc(struct cma *cma, struct cma_memrange *cmr, pfn = cmr->base_pfn + (bitmap_no << cma->order_per_bit); mutex_lock(&cma->alloc_mutex); - ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA, gfp); + if (cma->gcma) { + gcma_alloc_range(pfn, count); + ret = 0; + } else { + ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA, + gfp); + } mutex_unlock(&cma->alloc_mutex); if (ret == 0) { page = pfn_to_page(pfn); @@ -992,7 +1008,10 @@ bool cma_release(struct cma *cma, const struct page *pages, if (r == cma->nranges) return false; - free_contig_range(pfn, count); + if (cma->gcma) + gcma_free_range(pfn, count); + else + free_contig_range(pfn, count); cma_clear_bitmap(cma, cmr, pfn, count); cma_sysfs_account_release_pages(cma, count); trace_cma_release(cma->name, pfn, pages, count); diff --git a/mm/cma.h b/mm/cma.h index 41a3ab0ec3de..c2a5576d7987 100644 --- a/mm/cma.h +++ b/mm/cma.h @@ -47,6 +47,7 @@ struct cma { char name[CMA_MAX_NAME]; int nranges; struct cma_memrange ranges[CMA_MAX_RANGES]; + bool gcma; #ifdef CONFIG_CMA_SYSFS /* the number of CMA page successful allocations */ atomic64_t nr_pages_succeeded; diff --git a/mm/cma_sysfs.c b/mm/cma_sysfs.c index 97acd3e5a6a5..4ecc36270a4d 100644 --- a/mm/cma_sysfs.c +++ b/mm/cma_sysfs.c @@ -80,6 +80,15 @@ static ssize_t available_pages_show(struct kobject *kobj, } CMA_ATTR_RO(available_pages); +static ssize_t gcma_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct cma *cma = cma_from_kobj(kobj); + + return sysfs_emit(buf, "%d\n", cma->gcma); +} +CMA_ATTR_RO(gcma); + static void cma_kobj_release(struct kobject *kobj) { struct cma *cma = cma_from_kobj(kobj); @@ -95,6 +104,7 @@ static struct attribute *cma_attrs[] = { &release_pages_success_attr.attr, &total_pages_attr.attr, &available_pages_attr.attr, + &gcma_attr.attr, NULL, }; ATTRIBUTE_GROUPS(cma);