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charset="utf-8" Hotplug memory sources may have opinions on what the memblock size should be - usually for alignment purposes. For example, CXL memory extents can be 256MB with a matching alignment. If this size/alignment is smaller than the block size, it can result in stranded capacity. Implement memory_block_advise_max_size for use prior to allocator init, for software to advise the system on the max block size. Implement memory_block_probe_max_size for use by arch init code to calculate the best block size. Use of advice is architecture defined. The probe value can never change after first probe. Calls to advise after probe will return -EBUSY to aid debugging. On systems without hotplug, always return -ENODEV and 0 respectively. Suggested-by: Ira Weiny Signed-off-by: Gregory Price Acked-by: David Hildenbrand Acked-by: Mike Rapoport (Microsoft) Suggested-by: Dan Williams Suggested-by: David Hildenbrand --- drivers/base/memory.c | 53 ++++++++++++++++++++++++++++++++++++++++++ include/linux/memory.h | 10 ++++++++ 2 files changed, 63 insertions(+) diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 67858eeb92ed..835793150b41 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -110,6 +110,59 @@ static void memory_block_release(struct device *dev) kfree(mem); } =20 + +/* Max block size to be set by memory_block_advise_max_size */ +static unsigned long memory_block_advised_size; +static bool memory_block_advised_size_queried; + +/** + * memory_block_advise_max_size() - advise memory hotplug on the max sugge= sted + * block size, usually for alignment. + * @size: suggestion for maximum block size. must be aligned on power of 2. + * + * Early boot software (pre-allocator init) may advise archs on the max bl= ock + * size. This value can only decrease after initialization, as the intent = is + * to identify the largest supported alignment for all sources. + * + * Use of this value is arch-defined, as is min/max block size. + * + * Return: 0 on success + * -EINVAL if size is 0 or not pow2 aligned + * -EBUSY if value has already been probed + */ +int __init memory_block_advise_max_size(unsigned long size) +{ + if (!size || !is_power_of_2(size)) + return -EINVAL; + + if (memory_block_advised_size_queried) + return -EBUSY; + + if (memory_block_advised_size) { + memory_block_advised_size =3D min(memory_block_advised_size, + size); + } else { + memory_block_advised_size =3D size; + } + + return 0; +} + +/** + * memory_block_advised_max_size() - query advised max hotplug block size. + * + * After the first call, the value can never change. Callers looking for t= he + * actual block size should use memory_block_size_bytes. This interface is + * intended for use by arch-init when initializing the hotplug block size. + * + * Return: advised size in bytes, or 0 if never set. + */ +unsigned long memory_block_advised_max_size(void) +{ + memory_block_advised_size_queried =3D true; + return memory_block_advised_size; +} + unsigned long __weak memory_block_size_bytes(void) { return MIN_MEMORY_BLOCK_SIZE; diff --git a/include/linux/memory.h b/include/linux/memory.h index c0afee5d126e..8202d0efbf46 100644 --- a/include/linux/memory.h +++ b/include/linux/memory.h @@ -149,6 +149,14 @@ static inline int hotplug_memory_notifier(notifier_fn_= t fn, int pri) { return 0; } +static inline int memory_block_advise_max_size(unsigned long size) +{ + return -ENODEV; +} +static inline unsigned long memory_block_advised_max_size(void) +{ + return 0; +} #else /* CONFIG_MEMORY_HOTPLUG */ extern int register_memory_notifier(struct notifier_block *nb); extern void unregister_memory_notifier(struct notifier_block *nb); @@ -181,6 +189,8 @@ int walk_dynamic_memory_groups(int nid, walk_memory_gro= ups_func_t func, void memory_block_add_nid(struct memory_block *mem, int nid, enum meminit_context context); #endif /* CONFIG_NUMA */ +int memory_block_advise_max_size(unsigned long size); +unsigned long memory_block_advised_max_size(void); #endif /* CONFIG_MEMORY_HOTPLUG */ =20 /* --=20 2.43.0 From nobody Sun Nov 24 20:32:31 2024 Received: from mail-yb1-f171.google.com (mail-yb1-f171.google.com [209.85.219.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 79DF01A2545 for ; Fri, 1 Nov 2024 13:47:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730468839; cv=none; b=FRKcu7cUaFN1C3S4Dia0VTNNysEla92PmPsigiMJx1YTD0UWEOGY/bVvfDfQtAi/P0ShQIcOuqJKYMX3iQb9jnFlfCSgLdd/HNyc3gjLQxV2VMvhfuJR0GJZ7Ld7gXEdYyO70vCGt02OgXNt0JBAf0y0F6yJBH+KQfklHusZ1UU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730468839; c=relaxed/simple; bh=N0XPOmy3aARI7v9y/OYZfrAo+KC130k3/XQolnRqYXs=; 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charset="utf-8" Systems with hotplug may provide an advisement value on what the memblock size should be. Probe this value when the rest of the configuration values are considered. The new heuristic is as follows 1) set_memory_block_size_order value if already set (cmdline param) 2) minimum block size if memory is less than large block limit 3) if no hotplug advice: Max block size if system is bare-metal, otherwise use end of memory alignment. 4) if hotplug advice: lesser of advice and end of memory alignment. Suggested-by: David Hildenbrand Signed-off-by: Gregory Price Acked-by: David Hildenbrand Acked-by: Dave Hansen Acked-by: Mike Rapoport (Microsoft) Suggested-by: Dan Williams Suggested-by: Ira Weiny --- arch/x86/mm/init_64.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index ff253648706f..f1a495e998ce 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1452,16 +1452,21 @@ static unsigned long probe_memory_block_size(void) } =20 /* - * Use max block size to minimize overhead on bare metal, where - * alignment for memory hotplug isn't a concern. + * When hotplug alignment is not a concern, maximize blocksize + * to minimize overhead. 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Fri, 01 Nov 2024 06:47:20 -0700 (PDT) Received: from PC2K9PVX.TheFacebook.com ([50.193.156.113]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-462ad0cac07sm18840631cf.48.2024.11.01.06.47.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Nov 2024 06:47:19 -0700 (PDT) From: Gregory Price To: x86@kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-mm@kvack.org Cc: linux-cxl@vger.kernel.org, Jonathan.Cameron@huawei.com, dan.j.williams@intel.com, rrichter@amd.com, Terry.Bowman@amd.com, dave.jiang@intel.com, ira.weiny@intel.com, alison.schofield@intel.com, gourry@gourry.net, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, rafael@kernel.org, lenb@kernel.org, david@redhat.com, osalvador@suse.de, gregkh@linuxfoundation.org, akpm@linux-foundation.org, rppt@kernel.org Subject: [PATCH v5 3/3] acpi,srat: give memory block size advice based on CFMWS alignment Date: Fri, 1 Nov 2024 09:47:05 -0400 Message-ID: <20241101134706.1185-4-gourry@gourry.net> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241101134706.1185-1-gourry@gourry.net> References: <20241101134706.1185-1-gourry@gourry.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Capacity is stranded when CFMWS regions are not aligned to block size. On x86, block size increases with capacity (2G blocks @ 64G capacity). Use CFMWS base/size to report memory block size alignment advice. Suggested-by: Dan Williams Signed-off-by: Gregory Price Acked-by: David Hildenbrand Acked-by: Mike Rapoport (Microsoft) Suggested-by: David Hildenbrand Suggested-by: Ira Weiny --- drivers/acpi/numa/srat.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c index 44f91f2c6c5d..34b6993e7d6c 100644 --- a/drivers/acpi/numa/srat.c +++ b/drivers/acpi/numa/srat.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -338,13 +339,22 @@ static int __init acpi_parse_cfmws(union acpi_subtabl= e_headers *header, { struct acpi_cedt_cfmws *cfmws; int *fake_pxm =3D arg; - u64 start, end; + u64 start, end, align; int node; =20 cfmws =3D (struct acpi_cedt_cfmws *)header; start =3D cfmws->base_hpa; end =3D cfmws->base_hpa + cfmws->window_size; =20 + /* Align memblock size to CFMW regions if possible */ + align =3D 1UL << __ffs(start | end); + if (align >=3D SZ_256M) { + if (memory_block_advise_max_size(align) < 0) + pr_warn("CFMWS: memblock size advise failed\n"); + } else { + pr_err("CFMWS: [BIOS BUG] base/size alignment violates spec\n"); + } + /* * The SRAT may have already described NUMA details for all, * or a portion of, this CFMWS HPA range. Extend the memblks --=20 2.43.0