s390/test_unwind: add irq context tests
Add unwinding from irq context tests. Unwinder should be able to unwind through irq stack to task stack up to task pt_regs. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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0610154650
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@ -11,6 +11,8 @@
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/wait.h>
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#include <asm/irq.h>
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#include <asm/delay.h>
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#define BT_BUF_SIZE (PAGE_SIZE * 4)
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@ -100,11 +102,15 @@ static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs,
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/* State of the task being unwound. */
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struct unwindme {
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int flags;
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int ret;
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struct task_struct *task;
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struct completion task_ready;
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wait_queue_head_t task_wq;
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unsigned long sp;
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};
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static struct unwindme *unwindme;
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/* Values of unwindme.flags. */
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#define UWM_DEFAULT 0x0
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#define UWM_THREAD 0x1 /* Unwind a separate task. */
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@ -112,6 +118,7 @@ struct unwindme {
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#define UWM_SP 0x4 /* Pass sp to test_unwind(). */
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#define UWM_CALLER 0x8 /* Unwind starting from caller. */
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#define UWM_SWITCH_STACK 0x10 /* Use CALL_ON_STACK. */
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#define UWM_IRQ 0x20 /* Unwind from irq context. */
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static __always_inline unsigned long get_psw_addr(void)
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{
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@ -173,6 +180,34 @@ static noinline int unwindme_func1(void *u)
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return unwindme_func2((struct unwindme *)u);
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}
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static void unwindme_irq_handler(struct ext_code ext_code,
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unsigned int param32,
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unsigned long param64)
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{
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struct unwindme *u = READ_ONCE(unwindme);
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if (u && u->task == current) {
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unwindme = NULL;
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u->task = NULL;
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u->ret = unwindme_func1(u);
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}
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}
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static int test_unwind_irq(struct unwindme *u)
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{
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preempt_disable();
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if (register_external_irq(EXT_IRQ_CLK_COMP, unwindme_irq_handler)) {
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pr_info("Couldn't reqister external interrupt handler");
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return -1;
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}
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u->task = current;
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unwindme = u;
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udelay(1);
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unregister_external_irq(EXT_IRQ_CLK_COMP, unwindme_irq_handler);
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preempt_enable();
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return u->ret;
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}
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/* Spawns a task and passes it to test_unwind(). */
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static int test_unwind_task(struct unwindme *u)
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{
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@ -211,6 +246,8 @@ static int test_unwind_flags(int flags)
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u.flags = flags;
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if (u.flags & UWM_THREAD)
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return test_unwind_task(&u);
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else if (u.flags & UWM_IRQ)
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return test_unwind_irq(&u);
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else
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return unwindme_func1(&u);
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}
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@ -241,6 +278,14 @@ do { \
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TEST(UWM_THREAD);
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TEST(UWM_THREAD | UWM_SP);
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TEST(UWM_THREAD | UWM_CALLER | UWM_SP);
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TEST(UWM_IRQ);
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TEST(UWM_IRQ | UWM_SWITCH_STACK);
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TEST(UWM_IRQ | UWM_SP);
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TEST(UWM_IRQ | UWM_REGS);
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TEST(UWM_IRQ | UWM_SP | UWM_REGS);
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TEST(UWM_IRQ | UWM_CALLER | UWM_SP);
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TEST(UWM_IRQ | UWM_CALLER | UWM_SP | UWM_REGS);
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TEST(UWM_IRQ | UWM_CALLER | UWM_SP | UWM_REGS | UWM_SWITCH_STACK);
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#undef TEST
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return ret;
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