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authorKieran Bingham <kieran.bingham@linaro.org>2016-05-23 16:24:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-23 17:04:14 -0700
commite7165a2d7d87cd397d166ebf4d49763d28f5fc3d (patch)
treed9f2c2e9989b4a182fccc2e5594328900c6c5a52
parent74627cf2df50bfc29f51341578038e284796a101 (diff)
scripts/gdb: add io resource readers
Provide iomem_resource and ioports_resource printers and command hooks It can be quite interesting to halt the kernel as it's booting and check to see this list as it is being populated. It should be useful in the event that a kernel is not booting, you can identify what memory resources have been registered Link: http://lkml.kernel.org/r/f0a6b9fa9c92af4d7ed2e7343ccc84150e9c6fc5.1462865983.git.jan.kiszka@siemens.com Signed-off-by: Kieran Bingham <kieran.bingham@linaro.org> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--scripts/gdb/linux/proc.py57
1 files changed, 57 insertions, 0 deletions
diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py
index 6e6709c1830c..d855b2fd9a06 100644
--- a/scripts/gdb/linux/proc.py
+++ b/scripts/gdb/linux/proc.py
@@ -39,3 +39,60 @@ class LxVersion(gdb.Command):
gdb.write(gdb.parse_and_eval("linux_banner").string())
LxVersion()
+
+
+# Resource Structure Printers
+# /proc/iomem
+# /proc/ioports
+
+def get_resources(resource, depth):
+ while resource:
+ yield resource, depth
+
+ child = resource['child']
+ if child:
+ for res, deep in get_resources(child, depth + 1):
+ yield res, deep
+
+ resource = resource['sibling']
+
+
+def show_lx_resources(resource_str):
+ resource = gdb.parse_and_eval(resource_str)
+ width = 4 if resource['end'] < 0x10000 else 8
+ # Iterate straight to the first child
+ for res, depth in get_resources(resource['child'], 0):
+ start = int(res['start'])
+ end = int(res['end'])
+ gdb.write(" " * depth * 2 +
+ "{0:0{1}x}-".format(start, width) +
+ "{0:0{1}x} : ".format(end, width) +
+ res['name'].string() + "\n")
+
+
+class LxIOMem(gdb.Command):
+ """Identify the IO memory resource locations defined by the kernel
+
+Equivalent to cat /proc/iomem on a running target"""
+
+ def __init__(self):
+ super(LxIOMem, self).__init__("lx-iomem", gdb.COMMAND_DATA)
+
+ def invoke(self, arg, from_tty):
+ return show_lx_resources("iomem_resource")
+
+LxIOMem()
+
+
+class LxIOPorts(gdb.Command):
+ """Identify the IO port resource locations defined by the kernel
+
+Equivalent to cat /proc/ioports on a running target"""
+
+ def __init__(self):
+ super(LxIOPorts, self).__init__("lx-ioports", gdb.COMMAND_DATA)
+
+ def invoke(self, arg, from_tty):
+ return show_lx_resources("ioport_resource")
+
+LxIOPorts()