From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Diego Domingos <diegodo@br.ibm.com>
Date: Wed, 24 Jun 2020 08:17:18 -0400
Subject: [PATCH] ieee1275/powerpc: implements fibre channel discovery for
 ofpathname

grub-ofpathname doesn't work with fibre channel because there is no
function currently implemented for it.
This patch enables it by prividing a function that looks for the port
name, building the entire path for OF devices.
---
 grub-core/osdep/linux/ofpath.c | 52 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/grub-core/osdep/linux/ofpath.c b/grub-core/osdep/linux/ofpath.c
index 8f24bc9e897..4334b19cace 100644
--- a/grub-core/osdep/linux/ofpath.c
+++ b/grub-core/osdep/linux/ofpath.c
@@ -300,6 +300,38 @@ of_path_of_ide(const char *sys_devname __attribute__((unused)), const char *devi
   return ret;
 }
 
+
+static void
+of_fc_port_name(const char *path, const char *subpath, char *port_name)
+{
+  char *bname, *basepath, *p;
+  int fd;
+
+  bname = xmalloc(sizeof(char)*150);
+  basepath = xmalloc(strlen(path));
+
+  /* Generate the path to get port name information from the drive */
+  strncpy(basepath,path,subpath-path);
+  basepath[subpath-path-1] = '\0';
+  p = get_basename(basepath);
+  snprintf(bname,sizeof(char)*150,"%s/fc_transport/%s/port_name",basepath,p);
+
+  /* Read the information from the port name */
+  fd = open (bname, O_RDONLY);
+  if (fd < 0)
+    grub_util_error (_("cannot open `%s': %s"), bname, strerror (errno));
+
+  if (read(fd,port_name,sizeof(char)*19) < 0)
+    grub_util_error (_("cannot read `%s': %s"), bname, strerror (errno));
+
+  sscanf(port_name,"0x%s",port_name);
+  
+  close(fd);
+
+  free(bname);
+  free(basepath);
+}
+
 static int
 vendor_is_ATA(const char *path)
 {
@@ -404,7 +436,7 @@ of_path_of_scsi(const char *sys_devname __attribute__((unused)), const char *dev
     }
 
   of_path = find_obppath(sysfs_path);
-  free (sysfs_path);
+
   if (!of_path)
     return NULL;
 
@@ -419,6 +451,16 @@ of_path_of_scsi(const char *sys_devname __attribute__((unused)), const char *dev
   digit_string = trailing_digits (device);
   if (strncmp (of_path, "/vdevice/", sizeof ("/vdevice/") - 1) == 0)
     {
+      if(strstr(of_path,"vfc-client"))
+      {
+	char * port_name = xmalloc(sizeof(char)*17);
+	of_fc_port_name(sysfs_path, p, port_name);
+	
+	snprintf(disk,sizeof(disk),"/%s@%s", disk_name, port_name);
+	free(port_name);
+      }
+      else
+      {
       unsigned long id = 0x8000 | (tgt << 8) | (bus << 5) | lun;
       if (*digit_string == '\0')
 	{
@@ -432,6 +474,13 @@ of_path_of_scsi(const char *sys_devname __attribute__((unused)), const char *dev
 	  snprintf(disk, sizeof (disk),
 		   "/%s@%04lx000000000000:%c", disk_name, id, 'a' + (part - 1));
 	}
+	}
+    } else if (strstr(of_path,"fibre-channel")||(strstr(of_path,"vfc-client"))){
+	char * port_name = xmalloc(sizeof(char)*17);
+	of_fc_port_name(sysfs_path, p, port_name);
+	
+	snprintf(disk,sizeof(disk),"/%s@%s", disk_name, port_name);
+	free(port_name);
     }
   else
     {
@@ -482,6 +531,7 @@ of_path_of_scsi(const char *sys_devname __attribute__((unused)), const char *dev
             }
         }
     }
+  free (sysfs_path);
   strcat(of_path, disk);
   return of_path;
 }