From: Masami Hiramatsu <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>,
Frank Rowand <frowand.list@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>,
Namhyung Kim <namhyung@kernel.org>, Tim Bird <Tim.Bird@sony.com>,
Jiri Olsa <jolsa@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Tom Zanussi <tom.zanussi@linux.intel.com>,
Rob Herring <robh+dt@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alexey Dobriyan <adobriyan@gmail.com>,
Jonathan Corbet <corbet@lwn.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [RFC PATCH v3 03/19] skc: Add a boot setup routine from cmdline
Date: Mon, 26 Aug 2019 12:16:13 +0900 [thread overview]
Message-ID: <156678937345.21459.4178076251522180375.stgit@devnote2> (raw)
In-Reply-To: <156678933823.21459.4100380582025186209.stgit@devnote2>
Add a boot setup routine from cmdline option "skc=ADDR,SIZE".
Bootloader has to setup this cmdline option when it loads
the skc file on memory. The ADDR must be a physical address.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Documentation/admin-guide/kernel-parameters.txt | 5 ++
init/main.c | 54 +++++++++++++++++++++++
2 files changed, 59 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 47d981a86e2f..9a955b1bd1bf 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4273,6 +4273,11 @@
simeth= [IA-64]
simscsi=
+ skc=paddr,size [SKC]
+ Pass the physical memory address and size of loaded
+ supplemental kernel cmdline (SKC) text. This will
+ be treated by bootloader which loads the SKC file.
+
slram= [HW,MTD]
slab_nomerge [MM]
diff --git a/init/main.c b/init/main.c
index 96f8d5af52d6..d06eb3d63b77 100644
--- a/init/main.c
+++ b/init/main.c
@@ -36,6 +36,7 @@
#include <linux/kernel_stat.h>
#include <linux/start_kernel.h>
#include <linux/security.h>
+#include <linux/skc.h>
#include <linux/smp.h>
#include <linux/profile.h>
#include <linux/rcupdate.h>
@@ -245,6 +246,58 @@ static int __init loglevel(char *str)
early_param("loglevel", loglevel);
+#ifdef CONFIG_SKC
+__initdata unsigned long initial_skc;
+__initdata unsigned long initial_skc_len;
+
+static int __init save_skc_address(char *str)
+{
+ char *p;
+
+ p = strchr(str, ',');
+ if (!p)
+ return -EINVAL;
+ *p++ = '\0';
+ /* First options should be physical address - int is not enough */
+ if (kstrtoul(str, 0, &initial_skc) < 0)
+ return -EINVAL;
+ if (kstrtoul(p, 0, &initial_skc_len) < 0)
+ return -EINVAL;
+ if (initial_skc_len > SKC_DATA_MAX)
+ return -E2BIG;
+ /* Reserve it for protection */
+ memblock_reserve(initial_skc, initial_skc_len);
+
+ return 0;
+}
+early_param("skc", save_skc_address);
+
+static void __init setup_skc(void)
+{
+ u32 size;
+ char *data, *copy;
+
+ if (!initial_skc)
+ return;
+
+ data = early_memremap(initial_skc, initial_skc_len);
+ size = initial_skc_len + 1;
+
+ copy = memblock_alloc(size, SMP_CACHE_BYTES);
+ if (!copy) {
+ pr_err("Failed to allocate memory for structured kernel cmdline\n");
+ goto end;
+ }
+ memcpy(copy, data, initial_skc_len);
+ copy[size - 1] = '\0';
+
+ skc_init(copy);
+end:
+ early_memunmap(data, initial_skc_len);
+}
+#else
+#define setup_skc() do { } while (0)
+#endif
/* Change NUL term back to "=", to make "param" the whole string. */
static int __init repair_env_string(char *param, char *val,
const char *unused, void *arg)
@@ -596,6 +649,7 @@ asmlinkage __visible void __init start_kernel(void)
setup_arch(&command_line);
mm_init_cpumask(&init_mm);
setup_command_line(command_line);
+ setup_skc();
setup_nr_cpu_ids();
setup_per_cpu_areas();
smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
next prev parent reply other threads:[~2019-08-26 3:16 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-26 3:15 [RFC PATCH v3 00/19] tracing: skc: Boot-time tracing and Supplemental Kernel Cmdline Masami Hiramatsu
2019-08-26 3:15 ` [RFC PATCH v3 01/19] skc: Add supplemental kernel cmdline support Masami Hiramatsu
2019-08-26 13:27 ` Rob Herring
2019-08-27 2:37 ` Masami Hiramatsu
2019-08-26 3:16 ` [RFC PATCH v3 02/19] skc: Add /proc/sup_cmdline to show SKC key-value list Masami Hiramatsu
2019-08-26 3:16 ` Masami Hiramatsu [this message]
2019-08-26 3:16 ` [RFC PATCH v3 04/19] Documentation: skc: Add a doc for supplemental kernel cmdline Masami Hiramatsu
2019-08-26 3:16 ` [RFC PATCH v3 05/19] tracing: Apply soft-disabled and filter to tracepoints printk Masami Hiramatsu
2019-08-26 3:16 ` [RFC PATCH v3 06/19] tracing: kprobes: Output kprobe event to printk buffer Masami Hiramatsu
2019-08-26 3:17 ` [RFC PATCH v3 07/19] tracing: Expose EXPORT_SYMBOL_GPL symbol Masami Hiramatsu
2019-08-26 3:17 ` [RFC PATCH v3 08/19] tracing: kprobes: Register to dynevent earlier stage Masami Hiramatsu
2019-08-26 3:17 ` [RFC PATCH v3 09/19] tracing: Accept different type for synthetic event fields Masami Hiramatsu
2019-08-26 3:17 ` [RFC PATCH v3 10/19] tracing: Add NULL trace-array check in print_synth_event() Masami Hiramatsu
2019-08-26 3:17 ` [RFC PATCH v3 11/19] tracing/boot: Add boot-time tracing by supplemental kernel cmdline Masami Hiramatsu
2019-08-26 3:18 ` [RFC PATCH v3 12/19] tracing/boot: Add per-event settings Masami Hiramatsu
2019-08-26 3:18 ` [RFC PATCH v3 13/19] tracing/boot Add kprobe event support Masami Hiramatsu
2019-08-26 3:18 ` [RFC PATCH v3 14/19] tracing/boot: Add synthetic " Masami Hiramatsu
2019-08-26 3:18 ` [RFC PATCH v3 15/19] tracing/boot: Add instance node support Masami Hiramatsu
2019-08-26 3:18 ` [RFC PATCH v3 16/19] tracing/boot: Add cpu_mask option support Masami Hiramatsu
2019-08-26 3:18 ` [RFC PATCH v3 17/19] tracing/boot: Add function tracer filter options Masami Hiramatsu
2019-08-26 3:19 ` [RFC PATCH v3 18/19] tracing/boot: Add function-graph tracer options Masami Hiramatsu
2019-08-26 3:19 ` [RFC PATCH v3 19/19] Documentation: tracing: Add boot-time tracing document Masami Hiramatsu
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