Messages in this thread Patch in this message | | | From | Kieran Bingham <> | Subject | [PATCHv3 12/13] scripts/gdb: Add interrupts command | Date | Thu, 3 Mar 2016 11:41:06 +0000 |
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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(+)
diff --git a/scripts/gdb/linux/constants.py.in b/scripts/gdb/linux/constants.py.in index b38b9085c702..17b719ead54f 100644 --- a/scripts/gdb/linux/constants.py.in +++ b/scripts/gdb/linux/constants.py.in @@ -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 diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py index e5a8dbe3aa3a..0676a14e8d48 100644 --- a/scripts/gdb/linux/proc.py +++ b/scripts/gdb/linux/proc.py @@ -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() -- 2.5.0
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