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Wysocki" , Len Brown , Andrew Morton , David Hildenbrand , Oscar Salvador , Dan Williams , Dave Jiang Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, Huang Ying , Dave Hansen , Vishal Verma X-Mailer: b4 0.13-dev-02a79 X-Developer-Signature: v=1; a=openpgp-sha256; l=5348; i=vishal.l.verma@intel.com; h=from:subject:message-id; bh=y9Fdd4CaXjYhM8c/kYRc/ffM8uFuEd3rHTJq5W9ozIE=; b=owGbwMvMwCXGf25diOft7jLG02pJDCndXdJbnAJ++yhZVS3cvOTdxff5fUeOOrvs/W7jtJclP WTj/uU/OkpZGMS4GGTFFFn+7vnIeExuez5PYIIjzBxWJpAhDFycAjARjZWMDOcv2YmZnLWzVvS7 ZmDA/pxvkXo8w7k/p3WUixhuPrsgsYuR4cuznZa5advZfkrwz5A/cUmgei/3H+NlJ99c6hPf5ON 4lxcA X-Developer-Key: i=vishal.l.verma@intel.com; a=openpgp; fpr=F8682BE134C67A12332A2ED07AFA61BEA3B84DFF X-Rspamd-Queue-Id: 8C9CE140028 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: jtmtnnkhpnp44t7ki9ynqfhxca6wujyc X-HE-Tag: 1686866468-115961 X-HE-Meta: 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 UalWFadT stqaS7CYiqDt1C5mkVlcVDtTFuWsgiIU/o4Hw5Te8MOpt/npKxQTrNCr/3J0Kb0nukMctve1ooiDvM9I1tNPAbE5Z6iqu4Shvz+801/YHUt2NRR7/nFgMyjYkh4xfoOF/d7Utqm153GWoCBiHJLiWwXpushQgc2mrOAts1g5mIdodmCM56Gr+YCD1M+SZZ9Vc+ZF89J5GiqGQhMNwU+7OyQr9FVKOKGm4NGbpT11nfqtep1D1WL2SSB00R+DJlGPCgbf9a4iG5ZdIDjB7dHurnJgryoXJRFEbFGknInTrGsyEsjHrlQBmjOaVQ4OeshZQKlU7AAeIo4qcr+OnYTU+HwIM5ZI4Qpjyw6jxxNWuWwHBpJs= 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: For memory hotplug to consider MHP_MEMMAP_ON_MEMORY behavior, the 'memmap_on_memory' module parameter was a hard requirement. In preparation for the dax/kmem driver to use memmap_on_memory semantics, arrange for the module parameter check to be bypassed via the appropriate mhp_flag. Recall that the kmem driver could contribute huge amounts of hotplugged memory originating from special purposes devices such as CXL memory expanders. In some cases memmap_on_memory may be the /only/ way this new memory can be hotplugged. Hence it makes sense for kmem to have a way to force memmap_on_memory without depending on a module param, if all the other conditions for it are met. The only other user of this interface is acpi/acpi_memoryhotplug.c, which only enables the mhp_flag if an initial mhp_supports_memmap_on_memory() test passes. Maintain the existing behavior and semantics for this by performing the initial check from acpi without the MHP_MEMMAP_ON_MEMORY flag, so its decision falls back to the module parameter. Cc: "Rafael J. Wysocki" Cc: Len Brown Cc: Andrew Morton Cc: David Hildenbrand Cc: Oscar Salvador Cc: Dan Williams Cc: Dave Jiang Cc: Dave Hansen Cc: Huang Ying Signed-off-by: Vishal Verma --- include/linux/memory_hotplug.h | 2 +- drivers/acpi/acpi_memhotplug.c | 2 +- mm/memory_hotplug.c | 24 ++++++++++++++++-------- 3 files changed, 18 insertions(+), 10 deletions(-) diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index 9fcbf5706595..c9ddcd3cad70 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -358,7 +358,7 @@ extern struct zone *zone_for_pfn_range(int online_type, int nid, extern int arch_create_linear_mapping(int nid, u64 start, u64 size, struct mhp_params *params); void arch_remove_linear_mapping(u64 start, u64 size); -extern bool mhp_supports_memmap_on_memory(unsigned long size); +extern bool mhp_supports_memmap_on_memory(unsigned long size, mhp_t mhp_flags); #endif /* CONFIG_MEMORY_HOTPLUG */ #endif /* __LINUX_MEMORY_HOTPLUG_H */ diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c index 24f662d8bd39..119d3bb49753 100644 --- a/drivers/acpi/acpi_memhotplug.c +++ b/drivers/acpi/acpi_memhotplug.c @@ -211,7 +211,7 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) if (!info->length) continue; - if (mhp_supports_memmap_on_memory(info->length)) + if (mhp_supports_memmap_on_memory(info->length, 0)) mhp_flags |= MHP_MEMMAP_ON_MEMORY; result = __add_memory(mgid, info->start_addr, info->length, mhp_flags); diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 8e0fa209d533..bb3845830922 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1283,15 +1283,21 @@ static int online_memory_block(struct memory_block *mem, void *arg) return device_online(&mem->dev); } -bool mhp_supports_memmap_on_memory(unsigned long size) +bool mhp_supports_memmap_on_memory(unsigned long size, mhp_t mhp_flags) { unsigned long nr_vmemmap_pages = size / PAGE_SIZE; unsigned long vmemmap_size = nr_vmemmap_pages * sizeof(struct page); unsigned long remaining_size = size - vmemmap_size; /* - * Besides having arch support and the feature enabled at runtime, we - * need a few more assumptions to hold true: + * The MHP_MEMMAP_ON_MEMORY flag indicates a caller that wants to force + * memmap_on_memory (if other conditions are met), regardless of the + * module parameter. drivers/dax/kmem.c is an example, where large + * amounts of hotplug memory may come from, and the only option to + * successfully online all of it is to place the memmap on this memory. + * + * Besides having arch support and the feature enabled at runtime or + * via the mhp_flag, we need a few more assumptions to hold true: * * a) We span a single memory block: memory onlining/offlinin;g happens * in memory block granularity. We don't want the vmemmap of online @@ -1315,10 +1321,12 @@ bool mhp_supports_memmap_on_memory(unsigned long size) * altmap as an alternative source of memory, and we do not exactly * populate a single PMD. */ - return mhp_memmap_on_memory() && - size == memory_block_size_bytes() && - IS_ALIGNED(vmemmap_size, PMD_SIZE) && - IS_ALIGNED(remaining_size, (pageblock_nr_pages << PAGE_SHIFT)); + + if ((mhp_flags & MHP_MEMMAP_ON_MEMORY) || mhp_memmap_on_memory()) + return size == memory_block_size_bytes() && + IS_ALIGNED(vmemmap_size, PMD_SIZE) && + IS_ALIGNED(remaining_size, (pageblock_nr_pages << PAGE_SHIFT)); + return false; } /* @@ -1375,7 +1383,7 @@ int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) * Self hosted memmap array */ if (mhp_flags & MHP_MEMMAP_ON_MEMORY) { - if (!mhp_supports_memmap_on_memory(size)) { + if (!mhp_supports_memmap_on_memory(size, mhp_flags)) { ret = -EINVAL; goto error; }