[Skiboot] [PATCH] lshw: Parse OPAL firmware properties from the device tree

[Jeremy Kerr]

OPAL-firmware-based Power machines expose a firmware device tree node in
/ibm,opal, containing version information and available interfaces.

This change adds a function to parse information about OPAL firmware and
add it to lshw's machine information. With a current OpenPower machine,
we get something like this:

     *-firmware
          product: OPAL firmware
          physical id: 1
          version: skiboot-5.0.2
          capabilities: opal-v2 opal-v3 prd ipmi

Signed-off-by: Jeremy Kerr <jk at ozlabs.org>

---
Lionel: I only saw your email address in the lshw sources - let me know
if I should send this elsewhere

---
 src/core/device-tree.cc |   59 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/src/core/device-tree.cc b/src/core/device-tree.cc
index 8908fd1..73a98a9 100644
--- a/src/core/device-tree.cc
+++ b/src/core/device-tree.cc
@@ -168,6 +168,64 @@ static void scan_devtree_bootrom(hwNode & core)
   }
 }
 
+static void scan_devtree_opal_firmware(hwNode & core)
+{
+  vector < string >::iterator it;
+  vector < string > compat;
+  struct dirent **namelist;
+  int i, n;
+
+  if (!exists(DEVICETREE "/ibm,opal"))
+    return;
+
+  hwNode opal("firmware", hw::memory);
+
+  opal.setProduct("OPAL firmware");
+  if (exists(DEVICETREE "/ibm,opal/firmware/version"))
+    opal.setVersion(get_string(DEVICETREE "/ibm,opal/firmware/version"));
+
+  compat = get_strings(DEVICETREE "/ibm,opal/compatible");
+
+  for (it = compat.begin(); it != compat.end(); ++it) {
+    if (matches(*it, "^ibm,opal-v2"))
+      opal.addCapability("opal-v2");
+    if (matches(*it, "^ibm,opal-v3"))
+      opal.addCapability("opal-v3");
+  }
+
+  /* collect compatible strings from firmware sub-nodes */
+  compat.clear();
+  pushd(DEVICETREE "/ibm,opal");
+  n = scandir(".", &namelist, selectdir, alphasort);
+  popd();
+  for (i = 0; i < n; i++) {
+    string path = string(DEVICETREE "/ibm,opal/")
+                        + string(namelist[i]->d_name)
+                        + string("/compatible");
+
+    vector < string > tmp = get_strings(path);
+    compat.insert(compat.end(), tmp.begin(), tmp.end());
+
+    free(namelist[i]);
+  }
+
+  if (n >= 0)
+    free(namelist);
+
+  /* check our collected compatible strings for known capabilities */
+  for (it = compat.begin(); it != compat.end(); ++it) {
+
+    if (*it == "ibm,opal-prd")
+      opal.addCapability("prd");
+
+    if (*it == "ibm,opal-ipmi")
+      opal.addCapability("ipmi");
+  }
+
+  opal.claim();
+  core.addChild(opal);
+}
+
 
 static string cpubusinfo(int cpu)
 {
@@ -696,6 +754,7 @@ bool scan_device_tree(hwNode & n)
       scan_devtree_root(*core);
       scan_devtree_memory_powernv(*core);
       scan_devtree_cpu(*core);
+      scan_devtree_opal_firmware(*core);
       n.addCapability("powernv", "Non-virtualized");
       n.addCapability("opal", "OPAL firmware");
     }