diff options
| author | Steven Rostedt (Google) <rostedt@goodmis.org> | 2024-04-02 09:26:15 -0400 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2024-04-09 16:17:42 -0400 |
| commit | 3476bbecf61c5a2024f19357a5679e084557244b (patch) | |
| tree | 7096c611f7c4933262a98623f3643d48001f6de8 | |
| parent | 90868f5e3e1edbf6eead29331fc55173600a2bcd (diff) | |
| download | linux-trace-trace/memmap-top.tar.gz | |
pstore/ramoops: Add ramoops.mem_name= command line optiontrace/memmap-top
Add a method to find a region specified by memmap=nn*align:name for
ramoops. Adding a kernel command line parameter:
memmap=12M*4096:oops ramoops.mem_name=oops
Will use the size and location defined by the memmap parameter where it
finds the memory and labels it "oops". The "oops" in the ramoops option
is used to search for it.
This allows for arbitrary RAM to be used for ramoops if it is known that
the memory is not cleared on kernel crashes or soft reboots.
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
| -rw-r--r-- | fs/pstore/ram.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index b1a455f42e932..83ada9f351522 100644 --- a/fs/pstore/ram.c +++ b/fs/pstore/ram.c @@ -50,6 +50,11 @@ module_param_hw(mem_address, ullong, other, 0400); MODULE_PARM_DESC(mem_address, "start of reserved RAM used to store oops/panic logs"); +static char *mem_name; +module_param_named(mem_name, mem_name, charp, 0400); +MODULE_PARM_DESC(mem_name, + "name of kernel param that holds addr (builtin only)"); + static ulong mem_size; module_param(mem_size, ulong, 0400); MODULE_PARM_DESC(mem_size, @@ -914,6 +919,23 @@ static void __init ramoops_register_dummy(void) { struct ramoops_platform_data pdata; +#ifndef MODULE + /* Only allowed when builtin */ + printk("RAMOOPS HERE\n"); + if (mem_name) { + u64 start; + u64 size; + + printk("RAMOOPS: %s\n", mem_name); + if (memmap_named(mem_name, &start, &size)) { + mem_address = start; + mem_size = size; + + printk("FOUND RAMOOPS: %llx %llx\n", start, size); + } + } +#endif + /* * Prepare a dummy platform data structure to carry the module * parameters. If mem_size isn't set, then there are no module |