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AJvYcCWlGC5kY7c4kWDoC7Z3Z4ADOlB3mn9BnOfOJ2gl1ZCt4LD98lv5ehWwBqn2zrQmKLRuVRteihmxRA==@kvack.org X-Gm-Message-State: AOJu0YwNenTvSE19HfX+PwLl0Cvam7pJdAyxEttd8P2Mp65qLyUMi4ne OpqHbXeSuuxqm3gCJA4tVNyp2m9owa+MSQnRnyIKEXjnUANcmu9U3FdoUtDIYTwB/p0p8EMmIjf bXFLL8bP1x0Qk0dQO1g== X-Google-Smtp-Source: AGHT+IE0ecbHFG5zaMIC4HVa8/XK/kIO72d826eBh5y/vMRu72CI084/gqbKkAhATPz+cmQRUmjqsO3tccHgC5XI X-Received: from ploh10.prod.google.com ([2002:a17:902:f70a:b0:223:5c97:5c3c]) (user=changyuanl job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:2309:b0:22e:7f20:52c6 with SMTP id d9443c01a7336-22fc8b5c3dfmr34558255ad.23.1746776814150; Fri, 09 May 2025 00:46:54 -0700 (PDT) Date: Fri, 9 May 2025 00:46:19 -0700 In-Reply-To: <20250509074635.3187114-1-changyuanl@google.com> Mime-Version: 1.0 References: <20250509074635.3187114-1-changyuanl@google.com> X-Mailer: git-send-email 2.49.0.1015.ga840276032-goog Message-ID: <20250509074635.3187114-2-changyuanl@google.com> Subject: [PATCH v8 01/17] memblock: add MEMBLOCK_RSRV_KERN flag From: Changyuan Lyu To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org Cc: anthony.yznaga@oracle.com, arnd@arndb.de, ashish.kalra@amd.com, benh@kernel.crashing.org, bp@alien8.de, catalin.marinas@arm.com, corbet@lwn.net, dave.hansen@linux.intel.com, devicetree@vger.kernel.org, dwmw2@infradead.org, ebiederm@xmission.com, graf@amazon.com, hpa@zytor.com, jgowans@amazon.com, kexec@lists.infradead.org, krzk@kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, luto@kernel.org, mark.rutland@arm.com, mingo@redhat.com, pasha.tatashin@soleen.com, pbonzini@redhat.com, peterz@infradead.org, ptyadav@amazon.de, robh@kernel.org, rostedt@goodmis.org, rppt@kernel.org, saravanak@google.com, skinsburskii@linux.microsoft.com, tglx@linutronix.de, thomas.lendacky@amd.com, will@kernel.org, x86@kernel.org, Changyuan Lyu Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 6AD9880005 X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: jjgcrsyjba754dgyd63rbyihp7d3dns3 X-HE-Tag: 1746776815-365784 X-HE-Meta: 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 ozvhGP+p 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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: From: "Mike Rapoport (Microsoft)" to denote areas that were reserved for kernel use either directly with memblock_reserve_kern() or via memblock allocations. Signed-off-by: Mike Rapoport (Microsoft) Co-developed-by: Changyuan Lyu Signed-off-by: Changyuan Lyu --- include/linux/memblock.h | 19 ++++++++- mm/memblock.c | 40 +++++++++++++++---- tools/testing/memblock/tests/alloc_api.c | 22 +++++----- .../memblock/tests/alloc_helpers_api.c | 4 +- tools/testing/memblock/tests/alloc_nid_api.c | 20 +++++----- 5 files changed, 73 insertions(+), 32 deletions(-) diff --git a/include/linux/memblock.h b/include/linux/memblock.h index ef5a1ecc6e595..6c00fbc085132 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -42,6 +42,9 @@ extern unsigned long long max_possible_pfn; * kernel resource tree. * @MEMBLOCK_RSRV_NOINIT: memory region for which struct pages are * not initialized (only for reserved regions). + * @MEMBLOCK_RSRV_KERN: memory region that is reserved for kernel use, + * either explictitly with memblock_reserve_kern() or via memblock + * allocation APIs. All memblock allocations set this flag. */ enum memblock_flags { MEMBLOCK_NONE = 0x0, /* No special request */ @@ -50,6 +53,7 @@ enum memblock_flags { MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */ MEMBLOCK_DRIVER_MANAGED = 0x8, /* always detected via a driver */ MEMBLOCK_RSRV_NOINIT = 0x10, /* don't initialize struct pages */ + MEMBLOCK_RSRV_KERN = 0x20, /* memory reserved for kernel use */ }; /** @@ -116,7 +120,19 @@ int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid, int memblock_add(phys_addr_t base, phys_addr_t size); int memblock_remove(phys_addr_t base, phys_addr_t size); int memblock_phys_free(phys_addr_t base, phys_addr_t size); -int memblock_reserve(phys_addr_t base, phys_addr_t size); +int __memblock_reserve(phys_addr_t base, phys_addr_t size, int nid, + enum memblock_flags flags); + +static __always_inline int memblock_reserve(phys_addr_t base, phys_addr_t size) +{ + return __memblock_reserve(base, size, NUMA_NO_NODE, 0); +} + +static __always_inline int memblock_reserve_kern(phys_addr_t base, phys_addr_t size) +{ + return __memblock_reserve(base, size, NUMA_NO_NODE, MEMBLOCK_RSRV_KERN); +} + #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP int memblock_physmem_add(phys_addr_t base, phys_addr_t size); #endif @@ -476,6 +492,7 @@ static inline __init_memblock bool memblock_bottom_up(void) phys_addr_t memblock_phys_mem_size(void); phys_addr_t memblock_reserved_size(void); +phys_addr_t memblock_reserved_kern_size(phys_addr_t limit, int nid); unsigned long memblock_estimated_nr_free_pages(void); phys_addr_t memblock_start_of_DRAM(void); phys_addr_t memblock_end_of_DRAM(void); diff --git a/mm/memblock.c b/mm/memblock.c index 0a53db4d9f7be..2dc95ecdee5ce 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -492,7 +492,7 @@ static int __init_memblock memblock_double_array(struct memblock_type *type, * needn't do it */ if (!use_slab) - BUG_ON(memblock_reserve(addr, new_alloc_size)); + BUG_ON(memblock_reserve_kern(addr, new_alloc_size)); /* Update slab flag */ *in_slab = use_slab; @@ -642,7 +642,7 @@ static int __init_memblock memblock_add_range(struct memblock_type *type, #ifdef CONFIG_NUMA WARN_ON(nid != memblock_get_region_node(rgn)); #endif - WARN_ON(flags != rgn->flags); + WARN_ON(flags != MEMBLOCK_NONE && flags != rgn->flags); nr_new++; if (insert) { if (start_rgn == -1) @@ -902,14 +902,15 @@ int __init_memblock memblock_phys_free(phys_addr_t base, phys_addr_t size) return memblock_remove_range(&memblock.reserved, base, size); } -int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size) +int __init_memblock __memblock_reserve(phys_addr_t base, phys_addr_t size, + int nid, enum memblock_flags flags) { phys_addr_t end = base + size - 1; - memblock_dbg("%s: [%pa-%pa] %pS\n", __func__, - &base, &end, (void *)_RET_IP_); + memblock_dbg("%s: [%pa-%pa] nid=%d flags=%x %pS\n", __func__, + &base, &end, nid, flags, (void *)_RET_IP_); - return memblock_add_range(&memblock.reserved, base, size, MAX_NUMNODES, 0); + return memblock_add_range(&memblock.reserved, base, size, nid, flags); } #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP @@ -1460,14 +1461,14 @@ phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size, again: found = memblock_find_in_range_node(size, align, start, end, nid, flags); - if (found && !memblock_reserve(found, size)) + if (found && !__memblock_reserve(found, size, nid, MEMBLOCK_RSRV_KERN)) goto done; if (numa_valid_node(nid) && !exact_nid) { found = memblock_find_in_range_node(size, align, start, end, NUMA_NO_NODE, flags); - if (found && !memblock_reserve(found, size)) + if (found && !memblock_reserve_kern(found, size)) goto done; } @@ -1752,6 +1753,28 @@ phys_addr_t __init_memblock memblock_reserved_size(void) return memblock.reserved.total_size; } +phys_addr_t __init_memblock memblock_reserved_kern_size(phys_addr_t limit, int nid) +{ + struct memblock_region *r; + phys_addr_t total = 0; + + for_each_reserved_mem_region(r) { + phys_addr_t size = r->size; + + if (r->base > limit) + break; + + if (r->base + r->size > limit) + size = limit - r->base; + + if (nid == memblock_get_region_node(r) || !numa_valid_node(nid)) + if (r->flags & MEMBLOCK_RSRV_KERN) + total += size; + } + + return total; +} + /** * memblock_estimated_nr_free_pages - return estimated number of free pages * from memblock point of view @@ -2441,6 +2464,7 @@ static const char * const flagname[] = { [ilog2(MEMBLOCK_NOMAP)] = "NOMAP", [ilog2(MEMBLOCK_DRIVER_MANAGED)] = "DRV_MNG", [ilog2(MEMBLOCK_RSRV_NOINIT)] = "RSV_NIT", + [ilog2(MEMBLOCK_RSRV_KERN)] = "RSV_KERN", }; static int memblock_debug_show(struct seq_file *m, void *private) diff --git a/tools/testing/memblock/tests/alloc_api.c b/tools/testing/memblock/tests/alloc_api.c index 68f1a75cd72c4..c55f67dd367d0 100644 --- a/tools/testing/memblock/tests/alloc_api.c +++ b/tools/testing/memblock/tests/alloc_api.c @@ -134,7 +134,7 @@ static int alloc_top_down_before_check(void) PREFIX_PUSH(); setup_memblock(); - memblock_reserve(memblock_end_of_DRAM() - total_size, r1_size); + memblock_reserve_kern(memblock_end_of_DRAM() - total_size, r1_size); allocated_ptr = run_memblock_alloc(r2_size, SMP_CACHE_BYTES); @@ -182,7 +182,7 @@ static int alloc_top_down_after_check(void) total_size = r1.size + r2_size; - memblock_reserve(r1.base, r1.size); + memblock_reserve_kern(r1.base, r1.size); allocated_ptr = run_memblock_alloc(r2_size, SMP_CACHE_BYTES); @@ -231,8 +231,8 @@ static int alloc_top_down_second_fit_check(void) total_size = r1.size + r2.size + r3_size; - memblock_reserve(r1.base, r1.size); - memblock_reserve(r2.base, r2.size); + memblock_reserve_kern(r1.base, r1.size); + memblock_reserve_kern(r2.base, r2.size); allocated_ptr = run_memblock_alloc(r3_size, SMP_CACHE_BYTES); @@ -285,8 +285,8 @@ static int alloc_in_between_generic_check(void) total_size = r1.size + r2.size + r3_size; - memblock_reserve(r1.base, r1.size); - memblock_reserve(r2.base, r2.size); + memblock_reserve_kern(r1.base, r1.size); + memblock_reserve_kern(r2.base, r2.size); allocated_ptr = run_memblock_alloc(r3_size, SMP_CACHE_BYTES); @@ -422,7 +422,7 @@ static int alloc_limited_space_generic_check(void) setup_memblock(); /* Simulate almost-full memory */ - memblock_reserve(memblock_start_of_DRAM(), reserved_size); + memblock_reserve_kern(memblock_start_of_DRAM(), reserved_size); allocated_ptr = run_memblock_alloc(available_size, SMP_CACHE_BYTES); @@ -608,7 +608,7 @@ static int alloc_bottom_up_before_check(void) PREFIX_PUSH(); setup_memblock(); - memblock_reserve(memblock_start_of_DRAM() + r1_size, r2_size); + memblock_reserve_kern(memblock_start_of_DRAM() + r1_size, r2_size); allocated_ptr = run_memblock_alloc(r1_size, SMP_CACHE_BYTES); @@ -655,7 +655,7 @@ static int alloc_bottom_up_after_check(void) total_size = r1.size + r2_size; - memblock_reserve(r1.base, r1.size); + memblock_reserve_kern(r1.base, r1.size); allocated_ptr = run_memblock_alloc(r2_size, SMP_CACHE_BYTES); @@ -705,8 +705,8 @@ static int alloc_bottom_up_second_fit_check(void) total_size = r1.size + r2.size + r3_size; - memblock_reserve(r1.base, r1.size); - memblock_reserve(r2.base, r2.size); + memblock_reserve_kern(r1.base, r1.size); + memblock_reserve_kern(r2.base, r2.size); allocated_ptr = run_memblock_alloc(r3_size, SMP_CACHE_BYTES); diff --git a/tools/testing/memblock/tests/alloc_helpers_api.c b/tools/testing/memblock/tests/alloc_helpers_api.c index 3ef9486da8a09..e5362cfd2ff30 100644 --- a/tools/testing/memblock/tests/alloc_helpers_api.c +++ b/tools/testing/memblock/tests/alloc_helpers_api.c @@ -163,7 +163,7 @@ static int alloc_from_top_down_no_space_above_check(void) min_addr = memblock_end_of_DRAM() - SMP_CACHE_BYTES * 2; /* No space above this address */ - memblock_reserve(min_addr, r2_size); + memblock_reserve_kern(min_addr, r2_size); allocated_ptr = memblock_alloc_from(r1_size, SMP_CACHE_BYTES, min_addr); @@ -199,7 +199,7 @@ static int alloc_from_top_down_min_addr_cap_check(void) start_addr = (phys_addr_t)memblock_start_of_DRAM(); min_addr = start_addr - SMP_CACHE_BYTES * 3; - memblock_reserve(start_addr + r1_size, MEM_SIZE - r1_size); + memblock_reserve_kern(start_addr + r1_size, MEM_SIZE - r1_size); allocated_ptr = memblock_alloc_from(r1_size, SMP_CACHE_BYTES, min_addr); diff --git a/tools/testing/memblock/tests/alloc_nid_api.c b/tools/testing/memblock/tests/alloc_nid_api.c index 49bb416d34ffc..562e4701b0e02 100644 --- a/tools/testing/memblock/tests/alloc_nid_api.c +++ b/tools/testing/memblock/tests/alloc_nid_api.c @@ -324,7 +324,7 @@ static int alloc_nid_min_reserved_generic_check(void) min_addr = max_addr - r2_size; reserved_base = min_addr - r1_size; - memblock_reserve(reserved_base, r1_size); + memblock_reserve_kern(reserved_base, r1_size); allocated_ptr = run_memblock_alloc_nid(r2_size, SMP_CACHE_BYTES, min_addr, max_addr, @@ -374,7 +374,7 @@ static int alloc_nid_max_reserved_generic_check(void) max_addr = memblock_end_of_DRAM() - r1_size; min_addr = max_addr - r2_size; - memblock_reserve(max_addr, r1_size); + memblock_reserve_kern(max_addr, r1_size); allocated_ptr = run_memblock_alloc_nid(r2_size, SMP_CACHE_BYTES, min_addr, max_addr, @@ -436,8 +436,8 @@ static int alloc_nid_top_down_reserved_with_space_check(void) min_addr = r2.base + r2.size; max_addr = r1.base; - memblock_reserve(r1.base, r1.size); - memblock_reserve(r2.base, r2.size); + memblock_reserve_kern(r1.base, r1.size); + memblock_reserve_kern(r2.base, r2.size); allocated_ptr = run_memblock_alloc_nid(r3_size, SMP_CACHE_BYTES, min_addr, max_addr, @@ -499,8 +499,8 @@ static int alloc_nid_reserved_full_merge_generic_check(void) min_addr = r2.base + r2.size; max_addr = r1.base; - memblock_reserve(r1.base, r1.size); - memblock_reserve(r2.base, r2.size); + memblock_reserve_kern(r1.base, r1.size); + memblock_reserve_kern(r2.base, r2.size); allocated_ptr = run_memblock_alloc_nid(r3_size, SMP_CACHE_BYTES, min_addr, max_addr, @@ -563,8 +563,8 @@ static int alloc_nid_top_down_reserved_no_space_check(void) min_addr = r2.base + r2.size; max_addr = r1.base; - memblock_reserve(r1.base, r1.size); - memblock_reserve(r2.base, r2.size); + memblock_reserve_kern(r1.base, r1.size); + memblock_reserve_kern(r2.base, r2.size); allocated_ptr = run_memblock_alloc_nid(r3_size, SMP_CACHE_BYTES, min_addr, max_addr, @@ -909,8 +909,8 @@ static int alloc_nid_bottom_up_reserved_with_space_check(void) min_addr = r2.base + r2.size; max_addr = r1.base; - memblock_reserve(r1.base, r1.size); - memblock_reserve(r2.base, r2.size); + memblock_reserve_kern(r1.base, r1.size); + memblock_reserve_kern(r2.base, r2.size); allocated_ptr = run_memblock_alloc_nid(r3_size, SMP_CACHE_BYTES, min_addr, max_addr, -- 2.49.0.1015.ga840276032-goog