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powerpc/powernv: Expose OPAL firmware symbol map

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Newer versions of OPAL will provide this, so let's expose it to user
space so tools like perf can use it to properly decode samples in
firmware space.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2014-12-11 12:39:49 +11:00 committed by Michael Ellerman
parent 77b54e9f21
commit c8742f8512
1 changed files with 37 additions and 1 deletions
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38
arch/powerpc/platforms/powernv/opal.c
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@ -9,8 +9,9 @@
* 2 of the License, or (at your option) any later version.
*/
#undef DEBUG
#define pr_fmt(fmt) "opal: " fmt
#include <linux/printk.h>
#include <linux/types.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
@ -625,6 +626,39 @@ static int opal_sysfs_init(void)
return 0;
}
static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
return memory_read_from_buffer(buf, count, &off, bin_attr->private,
bin_attr->size);
}
static BIN_ATTR_RO(symbol_map, 0);
static void opal_export_symmap(void)
{
const __be64 *syms;
unsigned int size;
struct device_node *fw;
int rc;
fw = of_find_node_by_path("/ibm,opal/firmware");
if (!fw)
return;
syms = of_get_property(fw, "symbol-map", &size);
if (!syms || size != 2 * sizeof(__be64))
return;
/* Setup attributes */
bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0]));
bin_attr_symbol_map.size = be64_to_cpu(syms[1]);
rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map);
if (rc)
pr_warn("Error %d creating OPAL symbols file\n", rc);
}
static void __init opal_dump_region_init(void)
{
void *addr;
@ -713,6 +747,8 @@ static int __init opal_init(void)
/* Create "opal" kobject under /sys/firmware */
rc = opal_sysfs_init();
if (rc == 0) {
/* Export symbol map to userspace */
opal_export_symmap();
/* Setup dump region interface */
opal_dump_region_init();
/* Setup error log interface */