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From da5c33dd94949fa27243faf15cd87e98c53ccb29 Mon Sep 17 00:00:00 2001
From: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Date: Tue, 5 Nov 2013 10:16:14 +0200
Subject: [PATCH] fdtdump: Add live tree dump capability
Adds the capability to dump any point of the kernel's live tree
which resides usually in /proc/device-tree.
For example you can do this:
# fdtdump /proc/device-tree/ocp/ethernet\@4a100000/
/* dump of live tree at /proc/device-tree/ocp/ethernet@4a100000 */
/ {
name = "ethernet";
pinctrl-1 = <0x0000000b>;
pinctrl-0 = <0x0000000a>;
pinctrl-names = "default", "sleep";
ranges;
interrupts = <0x00000028 0x00000000 0x00000000 0x00000000>;
interrupt-parent = <0x00000001>;
#size-cells = <0x00000001>;
#address-cells = <0x00000001>;
reg = <0x4a100000 0x00000000 0x00000000 0x00000000>;
cpts_clock_shift = <0x0000001d>;
cpts_clock_mult = <0x80000000>;
active_slave = <0x00000000>;
slaves = <0x00000002>;
mac_control = <0x00000020>;
rx_descs = <0x00000040>;
no_bd_ram = <0x00000000>;
bd_ram_size = <0x00002000>;
ale_entries = <0x00000400>;
cpdma_channels = <0x00000008>;
ti,hwmods = "cpgmac0";
compatible = "ti,cpsw";
slave@4a100300 {
name = "slave";
phy-mode = "mii";
phy_id = <0x0000000e 0x00000000>;
mac-address = [00 00 00 00 00 00];
};
slave@4a100200 {
name = "slave";
phy-mode = "mii";
phy_id = <0x0000000e 0x00000000>;
mac-address = [00 00 00 00 00 00];
};
mdio@4a101000 {
name = "mdio";
phandle = <0x0000000e>;
linux,phandle = <0x0000000e>;
pinctrl-1 = <0x0000000d>;
pinctrl-0 = <0x0000000c>;
pinctrl-names = "default", "sleep";
reg = <0x4a101000 0x00000000>;
bus_freq = <0x000f4240>;
ti,hwmods = "davinci_mdio";
#size-cells = <0x00000000>;
#address-cells = <0x00000001>;
compatible = "ti,davinci_mdio";
};
};
This makes it much easier to see the state of the kernel's live tree.
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
---
fdtdump.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 107 insertions(+)
diff --git a/fdtdump.c b/fdtdump.c
index 95a6a20..9183555 100644
--- a/fdtdump.c
+++ b/fdtdump.c
@@ -8,6 +8,14 @@
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <alloca.h>
+#include <dirent.h>
+#include <limits.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
#include <libfdt.h>
#include <libfdt_env.h>
@@ -143,6 +151,95 @@ static void dump_blob(void *blob, bool debug)
}
}
+static void dump_live_internal(const char *path, bool debug, int depth)
+{
+ int maxsz = strlen(path) + 1 + PATH_MAX;
+ char *new_path = alloca(maxsz + 1);
+ struct stat sb;
+ struct dirent *de;
+ char *buf, *p;
+ int buf_alloc, shift, chunk, left, fd, ret;
+ DIR *d;
+
+ shift = 4;
+ buf_alloc = 4 * 1024; /* 4K (maximum chunk) */
+ buf = alloca(buf_alloc + sizeof(uint32_t));
+ buf[buf_alloc] = '\0'; /* always terminate (just in case) */
+
+ d = opendir(path);
+ if (d == NULL)
+ die("Could not open %s directory\n", path);
+
+ /* first dump the properties (files) */
+ while ((de = readdir(d)) != NULL) {
+ /* properties are files */
+ if (de->d_type != DT_REG)
+ continue;
+ snprintf(new_path, maxsz, "%s/%s", path, de->d_name);
+ new_path[maxsz] = '\0';
+ printf("%*s%s", depth * shift, "", de->d_name);
+
+ if (stat(new_path, &sb) != 0)
+ die("could not open: %s\n", new_path);
+
+ fd = open(new_path, O_RDONLY);
+ if (fd == -1)
+ die("Could not open: %s\n", new_path);
+
+ chunk = sb.st_size > buf_alloc ? buf_alloc : sb.st_size;
+ p = buf;
+ left = chunk;
+ while (left > 0) {
+ do {
+ ret = read(fd, p, left);
+ } while (ret == -1 && (errno == EAGAIN || errno == EINTR));
+ if (ret == -1)
+ die("Read failed on: %s\n", new_path);
+ left -= ret;
+ p += ret;
+ }
+ close(fd);
+
+ if (chunk < sb.st_size)
+ printf(" (trunc)");
+ utilfdt_print_data(buf, chunk);
+ printf(";\n");
+ }
+
+ /* now recurse to the directories */
+ rewinddir(d);
+ while ((de = readdir(d)) != NULL) {
+ /* properties are files */
+ if (de->d_type != DT_DIR)
+ continue;
+ /* skip current and parent directories */
+ if (strcmp(de->d_name, ".") == 0 ||
+ strcmp(de->d_name, "..") == 0)
+ continue;
+ snprintf(new_path, maxsz, "%s/%s", path, de->d_name);
+ new_path[maxsz] = '\0';
+ printf("%*s%s {\n", depth * shift, "", de->d_name);
+ dump_live_internal(new_path, debug, depth + 1);
+ printf("%*s};\n", depth * shift, "");
+ }
+}
+
+static void dump_live(const char *path, bool debug)
+{
+ char *fixed_path = alloca(strlen(path) + 1);
+ char *p;
+
+ /* strip trailing / */
+ strcpy(fixed_path, path);
+ p = fixed_path + strlen(fixed_path) - 1;
+ while (*p == '/' && p > fixed_path)
+ *p-- = '\0';
+ printf("/* dump of live tree at %s */\n", fixed_path);
+ printf("/ {\n");
+ dump_live_internal(fixed_path, debug, 1);
+ printf("};\n");
+}
+
/* Usage related data. */
static const char usage_synopsis[] = "fdtdump [options] <file>";
static const char usage_short_opts[] = "ds" USAGE_COMMON_SHORT_OPTS;
@@ -165,6 +262,7 @@ int main(int argc, char *argv[])
bool debug = false;
bool scan = false;
off_t len;
+ struct stat sb;
while ((opt = util_getopt_long()) != EOF) {
switch (opt) {
@@ -182,6 +280,15 @@ int main(int argc, char *argv[])
usage("missing input filename");
file = argv[optind];
+ if (stat(file, &sb) != 0)
+ die("could not open: %s\n", file);
+
+ /* dump live tree if it's a directory */
+ if (S_ISDIR(sb.st_mode)) {
+ dump_live(file, debug);
+ return 0;
+ }
+
buf = utilfdt_read_len(file, &len);
if (!buf)
die("could not read: %s\n", file);
--
1.9.1
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