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Message-Id: <20240624123739.43604-1-cuiyunhui@bytedance.com>
Date: Mon, 24 Jun 2024 20:37:39 +0800
From: Yunhui Cui <cuiyunhui@...edance.com>
To: charlie@...osinc.com,
rppt@...nel.org,
paul.walmsley@...ive.com,
palmer@...belt.com,
aou@...s.berkeley.edu,
alexghiti@...osinc.com,
akpm@...ux-foundation.org,
bhe@...hat.com,
dawei.li@...ngroup.cn,
jszhang@...nel.org,
namcao@...utronix.de,
chenjiahao16@...wei.com,
bjorn@...osinc.com,
cuiyunhui@...edance.com,
vishal.moola@...il.com,
linux-riscv@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2] RISC-V: cmdline: Add support for 'memmap' parameter
Add parsing of 'memmap' to use or reserve a specific region of memory.
Implement the following memmap variants:
- memmap=nn[KMG]@ss[KMG]: force usage of a specific region of memory;
- memmap=nn[KMG]$ss[KMG]: mark specified memory as reserved;
Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
---
arch/riscv/mm/init.c | 46 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index e3405e4b99af..8e1d93ae5cb2 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -208,6 +208,52 @@ static int __init early_mem(char *p)
}
early_param("mem", early_mem);
+static void __init parse_memmap_one(char *p)
+{
+ char *oldp;
+ unsigned long start_at, mem_size;
+
+ if (!p)
+ return;
+
+ oldp = p;
+ mem_size = memparse(p, &p);
+ if (p == oldp)
+ return;
+
+ switch (*p) {
+ case '@':
+ start_at = memparse(p + 1, &p);
+ memblock_add(start_at, mem_size);
+ break;
+
+ case '$':
+ start_at = memparse(p + 1, &p);
+ memblock_reserve(start_at, mem_size);
+ break;
+
+ default:
+ pr_warn("Unrecognized memmap syntax: %s\n", p);
+ break;
+ }
+}
+
+static int __init parse_memmap_opt(char *str)
+{
+ while (str) {
+ char *k = strchr(str, ',');
+
+ if (k)
+ *k++ = 0;
+
+ parse_memmap_one(str);
+ str = k;
+ }
+
+ return 0;
+}
+early_param("memmap", parse_memmap_opt);
+
static void __init setup_bootmem(void)
{
phys_addr_t vmlinux_end = __pa_symbol(&_end);
--
2.20.1
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