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Message-Id: <20240415142448.333271-1-skseofh@gmail.com>
Date: Mon, 15 Apr 2024 23:24:48 +0900
From: skseofh@...il.com
To: robh@...nel.org,
saravanak@...gle.com,
rppt@...nel.org,
akpm@...ux-foundation.org
Cc: devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-mm@...ck.org,
Daero Lee <daero_le.lee@...sung.com>
Subject: [PATCH] memblock: add no-map alloc functions
From: Daero Lee <daero_le.lee@...sung.com>
Like reserved-memory with the no-map property, there are memory regions
need to be allocated in memblock.memory marked with the
MEMBLOCK_NOMAP flag, but sholud not be allocated in memblock.reserved.
So, functions were added that find the required memory area in
memblock.memory, but do not allocate it to memblock.reserved.
The early_init_dt_alloc_reserved_memory_arch function was modified
using the no-map alloc function.
Signed-off-by: Daero Lee <daero_le.lee@...sung.com>
---
drivers/of/of_reserved_mem.c | 9 +++--
mm/memblock.c | 78 ++++++++++++++++++++++++++++++++++++
2 files changed, 84 insertions(+), 3 deletions(-)
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 8236ecae2953..504f2f60689c 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -40,15 +40,18 @@ static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end;
align = !align ? SMP_CACHE_BYTES : align;
- base = memblock_phys_alloc_range(size, align, start, end);
+ if (nomap) {
+ base = memblock_phys_alloc_range_nomap(size, align, start, end);
+ } else {
+ base = memblock_phys_alloc_range(size, align, start, end);
+ }
+
if (!base)
return -ENOMEM;
*res_base = base;
if (nomap) {
err = memblock_mark_nomap(base, size);
- if (err)
- memblock_phys_free(base, size);
}
kmemleak_ignore_phys(base);
diff --git a/mm/memblock.c b/mm/memblock.c
index d09136e040d3..f103f1ecbfad 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1506,6 +1506,72 @@ phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
return found;
}
+phys_addr_t __init memblock_alloc_range_nid_nomap(phys_addr_t size,
+ phys_addr_t align, phys_addr_t start,
+ phys_addr_t end, int nid,
+ bool exact_nid)
+{
+ enum memblock_flags flags = choose_memblock_flags();
+ phys_addr_t found;
+
+ if (WARN_ONCE(nid == MAX_NUMNODES, "Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
+ nid = NUMA_NO_NODE;
+
+ if (!align) {
+ /* Can't use WARNs this early in boot on powerpc */
+ dump_stack();
+ align = SMP_CACHE_BYTES;
+ }
+
+again:
+ found = memblock_find_in_range_node(size, align, start, end, nid,
+ flags);
+ if (found)
+ goto done;
+
+ if (nid != NUMA_NO_NODE && !exact_nid) {
+ found = memblock_find_in_range_node(size, align, start,
+ end, NUMA_NO_NODE,
+ flags);
+ if (found)
+ goto done;
+ }
+
+ if (flags & MEMBLOCK_MIRROR) {
+ flags &= ~MEMBLOCK_MIRROR;
+ pr_warn_ratelimited("Could not allocate %pap bytes of mirrored memory\n",
+ &size);
+ goto again;
+ }
+
+ return 0;
+
+done:
+ /*
+ * Skip kmemleak for those places like kasan_init() and
+ * early_pgtable_alloc() due to high volume.
+ */
+ if (end != MEMBLOCK_ALLOC_NOLEAKTRACE)
+ /*
+ * Memblock allocated blocks are never reported as
+ * leaks. This is because many of these blocks are
+ * only referred via the physical address which is
+ * not looked up by kmemleak.
+ */
+ kmemleak_alloc_phys(found, size, 0);
+
+ /*
+ * Some Virtual Machine platforms, such as Intel TDX or AMD SEV-SNP,
+ * require memory to be accepted before it can be used by the
+ * guest.
+ *
+ * Accept the memory of the allocated buffer.
+ */
+ accept_memory(found, found + size);
+
+ return found;
+}
+
/**
* memblock_phys_alloc_range - allocate a memory block inside specified range
* @size: size of memory block to be allocated in bytes
@@ -1530,6 +1596,18 @@ phys_addr_t __init memblock_phys_alloc_range(phys_addr_t size,
false);
}
+phys_addr_t __init memblock_phys_alloc_range_nomap(phys_addr_t size,
+ phys_addr_t align,
+ phys_addr_t start,
+ phys_addr_t end)
+{
+ memblock_dbg("%s: %llu bytes align=0x%llx from=%pa max_addr=%pa %pS\n",
+ __func__, (u64)size, (u64)align, &start, &end,
+ (void *)_RET_IP_);
+ return memblock_alloc_range_nid_nomap(size, align, start, end,
+ NUMA_NO_NODE, false);
+}
+
/**
* memblock_phys_alloc_try_nid - allocate a memory block from specified NUMA node
* @size: size of memory block to be allocated in bytes
--
2.25.1
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