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AJvYcCX9GfomGpyDfiUWdT8WK3ete2WfkfHJcDkWFxIVc1aGnXLtCCXQJV+ry5CxP/y0lHWoV9iTR1xaTA==@kvack.org X-Gm-Message-State: AOJu0Yx7bsZFRDrN5hHkGEwecivekfuz3ldN20Id/MieiATo5L8CPfwu Lid7iUaEbgwQLE2E3jS9o/aEZJm0nrGvILKY+UR63fjdi3I7SLTPVM4eTh/BiFlQaKRkAtQfdw= = X-Google-Smtp-Source: AGHT+IGswRfPvIKTnjtI+zMkN8y9+vmlGysmny2W+PeHbqNy2QPIL4i0nZkeiDjM4ghnJMXDuajKx5Z0 X-Received: from pjbpd11.prod.google.com ([2002:a17:90b:1dcb:b0:32e:73f6:ef02]) (user=fvdl job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:4b0c:b0:250:411d:fa83 with SMTP id d9443c01a7336-25d248c991amr137402865ad.15.1757965942499; Mon, 15 Sep 2025 12:52:22 -0700 (PDT) Date: Mon, 15 Sep 2025 19:51:44 +0000 In-Reply-To: <20250915195153.462039-1-fvdl@google.com> Mime-Version: 1.0 References: <20250915195153.462039-1-fvdl@google.com> X-Mailer: git-send-email 2.51.0.384.g4c02a37b29-goog Message-ID: <20250915195153.462039-4-fvdl@google.com> Subject: [RFC PATCH 03/12] mm/cma: add flags argument to init functions From: Frank van der Linden To: akpm@linux-foundation.org, muchun.song@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: hannes@cmpxchg.org, david@redhat.com, roman.gushchin@linux.dev, Frank van der Linden Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: 9juj7hhiinwknrfq7f1kigsd9i5upf74 X-Rspamd-Queue-Id: B1ADFA0013 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1757965943-97145 X-HE-Meta: U2FsdGVkX1/kd2UYGSjbpDoBbFUL6C93g/5e8cfx0zSkXn+it4XZ6fBozHCeUrHoaAo9X/Yu/cdtnapRgMgYzWZKDBec+D6+KLPlJRC+U/3e78INCuN33imffZxJ2+CqD3F7ekKpyzJZiV+xoRnbmLE/2CSXvuH1OaWVjBF2YequaQxv4DuzDk6Ky/LQjH4zu21Wg51Fv8/pOH8TpU8NrCHKNLki9KXDukIuGbVqRZY4gZJvUHhhJYu0DinliKTIQA7bEQRMZVJ1qxsTNfJQoWuqABFp1KrLYmwvPdP58ho+HxYZLHEESYD5drWnCM6qEgtzMIFNGTJxr+QhOFaAKd2kePL5d5dAna6gu1CKAAff5ObBfrq+/6Fiu5T1nV4FWuYL6TsUO9o1/a956cV/Jft1I51+8JFiDlIp9FKC27uRZ5nLpJp2vjeUp5X3yTHwLQTMKlC5SZ1kVMXZDm/vwrQQhVCbGh7uPqdqxZQhTh2+E57O/eJEgWHVL/osJuC4jU7b9v4ohHQbNMZOleuaGk6yc5XalNYmycbOAMoHoQJi+6Hz08cHrljiEJDKrNlIc4GfTkQA/I2nRmBEbAmxlffshMjjHhTyp7jZYWL0ierkhE66FFzNiP27f8wrfCFY4mZnJp7tHwqUHwBcSEYfluW+mdVYdnEQ4ntCwzca26XHYKLCX1eBLwGFX93A3ZXsakyvasMR2vIDAT9tPdJPkHWz9pVkZA8fGgVyph74eSx1l+8Bom0epGXTXBQTfw/HWhkk+VLponpjXR6qAd291Dz0B+LCZrwm+V+pgj4F15s6UI4Ud/Fy33l9QRLApeaFW5O/gEbwQWhKIalxql3U9wnz1PjHKqpnRfS8OF9fyAX1z3hUq2bU5yPhU6x5SWMyznOyxojbgnPQEHW+br9+KyYTME5+3hWKlTxlfOVk1H8lR3xw+OP1WRtN3UBU5VpqbelJaO8PDXvn0b/+OFR 7FqlVrt5 m9ZhagZ37bUfbX8RV4yKpj1wn6KeVYc/fXtGkRY/eTKhFSbPwzaZ3o3JW3Y4hlqXPzGNtub+cas7oALpbjALyFlJ4u4o5/K+F4KBP2TQIhFtHZOhNDO0/KotW8l1x11oNP50zrbkdz9QACFPXQWDGXBh6JIyQFVfPAIRiK6aaxsd9lb3dSrK2Lm0XC72vh/cQ8WUFGglgJZUMJLfRFc0PMbxTFqBFs9ubkWhdvdxc2Dzyr4imgPUxZaKEJPPMQVkv43U146I0FYPkDp5IznJAx4jrG5qXMDIt4rn99UGTpwJAZnsPCRP27rvf7d3tL/Qo7xuX9/DL9PbfhFa+AwcGzNchlwBxzOhuFr1lYdd4idBENfH5k/zOdKNTy7uwGbAdV0mx8r0iNUAgmHaIXPr2s8g9uo95GNRTQssnhag+mPkR6ZQFMUgi6TYr57zu/m3IovehRNe3pC0mOZR19+NTHcJmjJ+iUKRiwst0NgrmH/Q4aJTEBcOxOhSUcWTmQOSahqbNJoa3Gf3aS3WvY60AwUq9nw== 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: Add a flags argument to the various CMA init functions, as there will be a need to pass in more flags to control init and runtime behavior other than just the current 'fixed' argument. Replace the fixed argument with a flags argument, and adapt callers. Signed-off-by: Frank van der Linden --- arch/powerpc/kernel/fadump.c | 2 +- arch/powerpc/kvm/book3s_hv_builtin.c | 2 +- drivers/s390/char/vmcp.c | 2 +- include/linux/cma.h | 20 ++++++++++------ kernel/dma/contiguous.c | 10 ++++---- mm/cma.c | 36 ++++++++++++++++++---------- mm/hugetlb_cma.c | 2 +- 7 files changed, 46 insertions(+), 28 deletions(-) diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index 5782e743fd27..a763419bd1bc 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -112,7 +112,7 @@ 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, 0, "fadump_cma", &fadump_cma); if (rc) { pr_err("Failed to init cma area for firmware-assisted dump,%d\n", rc); /* diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index fa0e3a22cac0..23dcb67e797a 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -95,7 +95,7 @@ void __init kvm_cma_reserve(void) (unsigned long)selected_size / SZ_1M); align_size = HPT_ALIGN_PAGES << PAGE_SHIFT; cma_declare_contiguous(0, selected_size, 0, align_size, - KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, false, "kvm_cma", + KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, 0, "kvm_cma", &kvm_cma); } } diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c index 69899bb86b3e..cd0c0edc496b 100644 --- a/drivers/s390/char/vmcp.c +++ b/drivers/s390/char/vmcp.c @@ -54,7 +54,7 @@ void __init vmcp_cma_reserve(void) { if (!machine_is_vm()) return; - cma_declare_contiguous(0, vmcp_cma_size, 0, 0, 0, false, "vmcp", &vmcp_cma); + cma_declare_contiguous(0, vmcp_cma_size, 0, 0, 0, 0, "vmcp", &vmcp_cma); } static void vmcp_response_alloc(struct vmcp_session *session) diff --git a/include/linux/cma.h b/include/linux/cma.h index 5c3fdc5da908..ec48f2a11f1d 100644 --- a/include/linux/cma.h +++ b/include/linux/cma.h @@ -25,12 +25,16 @@ enum cma_flags { __CMA_ZONES_VALID, __CMA_ZONES_INVALID, __CMA_ACTIVATED, + __CMA_FIXED, }; #define CMA_RESERVE_PAGES_ON_ERROR BIT(__CMA_RESERVE_PAGES_ON_ERROR) #define CMA_ZONES_VALID BIT(__CMA_ZONES_VALID) #define CMA_ZONES_INVALID BIT(__CMA_ZONES_INVALID) #define CMA_ACTIVATED BIT(__CMA_ACTIVATED) +#define CMA_FIXED BIT(__CMA_FIXED) + +#define CMA_INIT_FLAGS (CMA_FIXED|CMA_RESERVE_PAGES_ON_ERROR) struct cma; @@ -42,23 +46,25 @@ extern const char *cma_get_name(const struct cma *cma); extern int __init cma_declare_contiguous_nid(phys_addr_t base, phys_addr_t size, phys_addr_t limit, phys_addr_t alignment, unsigned int order_per_bit, - bool fixed, const char *name, struct cma **res_cma, - int nid); + unsigned long flags, const char *name, + struct cma **res_cma, int nid); static inline int __init cma_declare_contiguous(phys_addr_t base, phys_addr_t size, phys_addr_t limit, phys_addr_t alignment, unsigned int order_per_bit, - bool fixed, const char *name, struct cma **res_cma) + unsigned long flags, const char *name, + struct cma **res_cma) { return cma_declare_contiguous_nid(base, size, limit, alignment, - order_per_bit, fixed, name, res_cma, NUMA_NO_NODE); + order_per_bit, flags, name, res_cma, NUMA_NO_NODE); } extern int __init cma_declare_contiguous_multi(phys_addr_t size, phys_addr_t align, unsigned int order_per_bit, - const char *name, struct cma **res_cma, int nid); + unsigned long flags, const char *name, + struct cma **res_cma, int nid); 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); + unsigned long flags, + const char *name, struct cma **res_cma); 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 d9b9dcba6ff7..7f2eed3b7cc5 100644 --- a/kernel/dma/contiguous.c +++ b/kernel/dma/contiguous.c @@ -175,7 +175,7 @@ static void __init dma_numa_cma_reserve(void) cma = &dma_contiguous_pernuma_area[nid]; snprintf(name, sizeof(name), "pernuma%d", nid); ret = cma_declare_contiguous_nid(0, pernuma_size_bytes, 0, 0, - 0, false, name, cma, nid); + 0, 0, name, cma, nid); if (ret) pr_warn("%s: reservation failed: err %d, node %d", __func__, ret, nid); @@ -185,7 +185,7 @@ static void __init dma_numa_cma_reserve(void) cma = &dma_contiguous_numa_area[nid]; snprintf(name, sizeof(name), "numa%d", nid); - ret = cma_declare_contiguous_nid(0, numa_cma_size[nid], 0, 0, 0, false, + ret = cma_declare_contiguous_nid(0, numa_cma_size[nid], 0, 0, 0, 0, name, cma, nid); if (ret) pr_warn("%s: reservation failed: err %d, node %d", __func__, @@ -279,7 +279,8 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base, { int ret; - ret = cma_declare_contiguous(base, size, limit, 0, 0, fixed, + ret = cma_declare_contiguous(base, size, limit, 0, 0, + fixed ? CMA_FIXED : 0, "reserved", res_cma); if (ret) return ret; @@ -478,7 +479,8 @@ 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); + err = cma_init_reserved_mem(rmem->base, rmem->size, 0, 0, rmem->name, + &cma); 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 549d85b2e3a3..00d8d365f0b5 100644 --- a/mm/cma.c +++ b/mm/cma.c @@ -35,6 +35,7 @@ struct cma cma_areas[MAX_CMA_AREAS]; unsigned int cma_area_count; +static DEFINE_MUTEX(cma_mutex); phys_addr_t cma_get_base(const struct cma *cma) { @@ -215,7 +216,7 @@ void __init cma_reserve_pages_on_error(struct cma *cma) } static int __init cma_new_area(const char *name, phys_addr_t size, - unsigned int order_per_bit, + unsigned int order_per_bit, unsigned long flags, struct cma **res_cma) { struct cma *cma; @@ -239,6 +240,7 @@ static int __init cma_new_area(const char *name, phys_addr_t size, cma->available_count = cma->count = size >> PAGE_SHIFT; cma->order_per_bit = order_per_bit; + cma->flags = flags; *res_cma = cma; totalcma_pages += cma->count; @@ -265,7 +267,7 @@ 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, + unsigned long flags, const char *name, struct cma **res_cma) { struct cma *cma; @@ -288,7 +290,7 @@ int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, if (!IS_ALIGNED(base | size, CMA_MIN_ALIGNMENT_BYTES)) return -EINVAL; - ret = cma_new_area(name, size, order_per_bit, &cma); + ret = cma_new_area(name, size, order_per_bit, flags, &cma); if (ret != 0) return ret; @@ -429,12 +431,18 @@ static phys_addr_t __init cma_alloc_mem(phys_addr_t base, phys_addr_t size, static int __init __cma_declare_contiguous_nid(phys_addr_t *basep, phys_addr_t size, phys_addr_t limit, phys_addr_t alignment, unsigned int order_per_bit, - bool fixed, const char *name, struct cma **res_cma, - int nid) + unsigned long flags, const char *name, + struct cma **res_cma, int nid) { phys_addr_t memblock_end = memblock_end_of_DRAM(); phys_addr_t base = *basep; int ret; + bool fixed; + + if (flags & ~CMA_INIT_FLAGS) + return -EINVAL; + + fixed = (flags & CMA_FIXED); pr_debug("%s(size %pa, base %pa, limit %pa alignment %pa)\n", __func__, &size, &base, &limit, &alignment); @@ -503,7 +511,8 @@ static int __init __cma_declare_contiguous_nid(phys_addr_t *basep, kmemleak_ignore_phys(base); } - ret = cma_init_reserved_mem(base, size, order_per_bit, name, res_cma); + ret = cma_init_reserved_mem(base, size, order_per_bit, flags, + name, res_cma); if (ret) { memblock_phys_free(base, size); return ret; @@ -526,7 +535,8 @@ static int __init __cma_declare_contiguous_nid(phys_addr_t *basep, */ int __init cma_declare_contiguous_multi(phys_addr_t total_size, phys_addr_t align, unsigned int order_per_bit, - const char *name, struct cma **res_cma, int nid) + unsigned long flags, const char *name, + struct cma **res_cma, int nid) { phys_addr_t start = 0, end; phys_addr_t size, sizesum, sizeleft; @@ -543,7 +553,7 @@ int __init cma_declare_contiguous_multi(phys_addr_t total_size, * First, try it the normal way, producing just one range. */ ret = __cma_declare_contiguous_nid(&start, total_size, 0, align, - order_per_bit, false, name, res_cma, nid); + order_per_bit, flags, name, res_cma, nid); if (ret != -ENOMEM) goto out; @@ -567,7 +577,7 @@ int __init cma_declare_contiguous_multi(phys_addr_t total_size, sizesum = 0; failed = NULL; - ret = cma_new_area(name, total_size, order_per_bit, &cma); + ret = cma_new_area(name, total_size, order_per_bit, flags, &cma); if (ret != 0) goto out; @@ -716,7 +726,7 @@ int __init cma_declare_contiguous_multi(phys_addr_t total_size, * @limit: End address of the reserved memory (optional, 0 for any). * @alignment: Alignment for the CMA area, should be power of 2 or zero * @order_per_bit: Order of pages represented by one bit on bitmap. - * @fixed: hint about where to place the reserved area + * @flags: flags controlling various aspects of the area * @name: The name of the area. See function cma_init_reserved_mem() * @res_cma: Pointer to store the created cma region. * @nid: nid of the free area to find, %NUMA_NO_NODE for any node @@ -732,13 +742,13 @@ int __init cma_declare_contiguous_multi(phys_addr_t total_size, int __init cma_declare_contiguous_nid(phys_addr_t base, phys_addr_t size, phys_addr_t limit, phys_addr_t alignment, unsigned int order_per_bit, - bool fixed, const char *name, struct cma **res_cma, - int nid) + unsigned long flags, const char *name, + struct cma **res_cma, int nid) { int ret; ret = __cma_declare_contiguous_nid(&base, size, limit, alignment, - order_per_bit, fixed, name, res_cma, nid); + order_per_bit, flags, name, res_cma, nid); if (ret != 0) pr_err("Failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M); diff --git a/mm/hugetlb_cma.c b/mm/hugetlb_cma.c index f58ef4969e7a..71d0e9a048d4 100644 --- a/mm/hugetlb_cma.c +++ b/mm/hugetlb_cma.c @@ -221,7 +221,7 @@ void __init hugetlb_cma_reserve(int order) * huge page demotion. */ res = cma_declare_contiguous_multi(size, PAGE_SIZE << order, - HUGETLB_PAGE_ORDER, name, + HUGETLB_PAGE_ORDER, 0, name, &hugetlb_cma[nid], nid); if (res) { pr_warn("hugetlb_cma: reservation failed: err %d, node %d", -- 2.51.0.384.g4c02a37b29-goog