@@ -84,6 +84,7 @@ LX_CONFIG(CONFIG_TRANSPARENT_HUGEPAGE)
LX_CONFIG(CONFIG_CMA)
LX_CONFIG(CONFIG_MMU)
LX_CONFIG(CONFIG_SWAP)
+LX_CONFIG(CONFIG_SPARSE_IRQ)
#ifndef CONFIG_NR_QUICK
#define CONFIG_NR_QUICK 0
@@ -16,6 +16,8 @@ from linux import constants
from linux import utils
from linux import tasks
from linux import lists
+from linux import cpus
+from linux import radixtree
class LxCmdLine(gdb.Command):
@@ -423,3 +425,66 @@ Equivalent to cat /proc/meminfo on a running target """
)
LxMeminfo()
+
+irq_desc = None
+irq_desc_type = utils.CachedType("struct irq_desc")
+
+
+class LxInterrupts(gdb.Command):
+ """ Report the interrupt counters of each CPU.
+ Equivalent to cat /proc/interrupts on a running target """
+
+ def __init__(self):
+ super(LxInterrupts, self).__init__("lx-interrupts", gdb.COMMAND_DATA)
+
+ def irq_to_desc(self, irq):
+ if constants.LX_CONFIG_SPARSE_IRQ:
+ irq_desc_tree = gdb.parse_and_eval("irq_desc_tree")
+ irq_desc_addr = radixtree.lookup(irq_desc_tree, irq)
+
+ if irq_desc_addr is None:
+ return None
+
+ if irq_desc_addr.address:
+ return irq_desc_addr.cast(irq_desc_type.get_type())
+ return None
+ else:
+ irq_desc_array = "irq_desc[{}]".format(irq)
+ return gdb.parse_and_eval(irq_desc_array)
+
+ def kstat_irqs_cpu(self, irq_desc, cpu):
+ return int(cpus.per_cpu(irq_desc['kstat_irqs'], cpu))
+
+ def invoke(self, arg, from_tty):
+ nr_irqs = int(gdb.parse_and_eval("nr_irqs"))
+
+ # Calculate the width of the first column
+ prec = 3
+ j = nr_irqs
+ while (j <= nr_irqs):
+ j *= 10
+ prec += 1
+
+ title = "{:{}}".format(" ", prec+8)
+ for cpu in cpus.each_online_cpu():
+ title += "CPU{:<8d}".format(cpu)
+ gdb.write(title + "\n")
+
+ for irq in range(0, nr_irqs):
+ desc = self.irq_to_desc(irq)
+ if desc is None:
+ continue
+
+ anycount = 0
+ for cpu in cpus.each_online_cpu():
+ anycount += self.kstat_irqs_cpu(desc, cpu)
+ if (anycount == 0):
+ continue
+
+ irq_line = "{:{}d}: ".format(irq, prec)
+ for cpu in cpus.each_online_cpu():
+ count = self.kstat_irqs_cpu(desc, cpu)
+ irq_line += "{:10d} ".format(count)
+ gdb.write(irq_line + "\n")
+
+LxInterrupts()
Allow the debugger to present a list of all interrupts and their associated counts. This will allow developers of drivers to identify hardware interactions in the event of crashed kernels and core dumps. Signed-off-by: Kieran Bingham <kieran.bingham@linaro.org> --- scripts/gdb/linux/constants.py.in | 1 + scripts/gdb/linux/proc.py | 65 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 66 insertions(+) -- 2.5.0