1 files changed, 1 insertions, 248 deletions

diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
index bf8dda1a7e04..b8513dc3e53a 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -114,253 +114,6 @@ static bool is_ptrace_bp(struct perf_event *bp)
 	return bp->overflow_handler == ptrace_triggered;
 }
 
-struct breakpoint {
-	struct list_head list;
-	struct perf_event *bp;
-	bool ptrace_bp;
-};
-
-/*
- * While kernel/events/hw_breakpoint.c does its own synchronization, we cannot
- * rely on it safely synchronizing internals here; however, we can rely on it
- * not requesting more breakpoints than available.
- */
-static DEFINE_SPINLOCK(cpu_bps_lock);
-static DEFINE_PER_CPU(struct breakpoint *, cpu_bps[HBP_NUM_MAX]);
-static DEFINE_SPINLOCK(task_bps_lock);
-static LIST_HEAD(task_bps);
-
-static struct breakpoint *alloc_breakpoint(struct perf_event *bp)
-{
-	struct breakpoint *tmp;
-
-	tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
-	if (!tmp)
-		return ERR_PTR(-ENOMEM);
-	tmp->bp = bp;
-	tmp->ptrace_bp = is_ptrace_bp(bp);
-	return tmp;
-}
-
-static bool bp_addr_range_overlap(struct perf_event *bp1, struct perf_event *bp2)
-{
-	__u64 bp1_saddr, bp1_eaddr, bp2_saddr, bp2_eaddr;
-
-	bp1_saddr = ALIGN_DOWN(bp1->attr.bp_addr, HW_BREAKPOINT_SIZE);
-	bp1_eaddr = ALIGN(bp1->attr.bp_addr + bp1->attr.bp_len, HW_BREAKPOINT_SIZE);
-	bp2_saddr = ALIGN_DOWN(bp2->attr.bp_addr, HW_BREAKPOINT_SIZE);
-	bp2_eaddr = ALIGN(bp2->attr.bp_addr + bp2->attr.bp_len, HW_BREAKPOINT_SIZE);
-
-	return (bp1_saddr < bp2_eaddr && bp1_eaddr > bp2_saddr);
-}
-
-static bool alternate_infra_bp(struct breakpoint *b, struct perf_event *bp)
-{
-	return is_ptrace_bp(bp) ? !b->ptrace_bp : b->ptrace_bp;
-}
-
-static bool can_co_exist(struct breakpoint *b, struct perf_event *bp)
-{
-	return !(alternate_infra_bp(b, bp) && bp_addr_range_overlap(b->bp, bp));
-}
-
-static int task_bps_add(struct perf_event *bp)
-{
-	struct breakpoint *tmp;
-
-	tmp = alloc_breakpoint(bp);
-	if (IS_ERR(tmp))
-		return PTR_ERR(tmp);
-
-	spin_lock(&task_bps_lock);
-	list_add(&tmp->list, &task_bps);
-	spin_unlock(&task_bps_lock);
-	return 0;
-}
-
-static void task_bps_remove(struct perf_event *bp)
-{
-	struct list_head *pos, *q;
-
-	spin_lock(&task_bps_lock);
-	list_for_each_safe(pos, q, &task_bps) {
-		struct breakpoint *tmp = list_entry(pos, struct breakpoint, list);
-
-		if (tmp->bp == bp) {
-			list_del(&tmp->list);
-			kfree(tmp);
-			break;
-		}
-	}
-	spin_unlock(&task_bps_lock);
-}
-
-/*
- * If any task has breakpoint from alternate infrastructure,
- * return true. Otherwise return false.
- */
-static bool all_task_bps_check(struct perf_event *bp)
-{
-	struct breakpoint *tmp;
-	bool ret = false;
-
-	spin_lock(&task_bps_lock);
-	list_for_each_entry(tmp, &task_bps, list) {
-		if (!can_co_exist(tmp, bp)) {
-			ret = true;
-			break;
-		}
-	}
-	spin_unlock(&task_bps_lock);
-	return ret;
-}
-
-/*
- * If same task has breakpoint from alternate infrastructure,
- * return true. Otherwise return false.
- */
-static bool same_task_bps_check(struct perf_event *bp)
-{
-	struct breakpoint *tmp;
-	bool ret = false;
-
-	spin_lock(&task_bps_lock);
-	list_for_each_entry(tmp, &task_bps, list) {
-		if (tmp->bp->hw.target == bp->hw.target &&
-		    !can_co_exist(tmp, bp)) {
-			ret = true;
-			break;
-		}
-	}
-	spin_unlock(&task_bps_lock);
-	return ret;
-}
-
-static int cpu_bps_add(struct perf_event *bp)
-{
-	struct breakpoint **cpu_bp;
-	struct breakpoint *tmp;
-	int i = 0;
-
-	tmp = alloc_breakpoint(bp);
-	if (IS_ERR(tmp))
-		return PTR_ERR(tmp);
-
-	spin_lock(&cpu_bps_lock);
-	cpu_bp = per_cpu_ptr(cpu_bps, bp->cpu);
-	for (i = 0; i < nr_wp_slots(); i++) {
-		if (!cpu_bp[i]) {
-			cpu_bp[i] = tmp;
-			break;
-		}
-	}
-	spin_unlock(&cpu_bps_lock);
-	return 0;
-}
-
-static void cpu_bps_remove(struct perf_event *bp)
-{
-	struct breakpoint **cpu_bp;
-	int i = 0;
-
-	spin_lock(&cpu_bps_lock);
-	cpu_bp = per_cpu_ptr(cpu_bps, bp->cpu);
-	for (i = 0; i < nr_wp_slots(); i++) {
-		if (!cpu_bp[i])
-			continue;
-
-		if (cpu_bp[i]->bp == bp) {
-			kfree(cpu_bp[i]);
-			cpu_bp[i] = NULL;
-			break;
-		}
-	}
-	spin_unlock(&cpu_bps_lock);
-}
-
-static bool cpu_bps_check(int cpu, struct perf_event *bp)
-{
-	struct breakpoint **cpu_bp;
-	bool ret = false;
-	int i;
-
-	spin_lock(&cpu_bps_lock);
-	cpu_bp = per_cpu_ptr(cpu_bps, cpu);
-	for (i = 0; i < nr_wp_slots(); i++) {
-		if (cpu_bp[i] && !can_co_exist(cpu_bp[i], bp)) {
-			ret = true;
-			break;
-		}
-	}
-	spin_unlock(&cpu_bps_lock);
-	return ret;
-}
-
-static bool all_cpu_bps_check(struct perf_event *bp)
-{
-	int cpu;
-
-	for_each_online_cpu(cpu) {
-		if (cpu_bps_check(cpu, bp))
-			return true;
-	}
-	return false;
-}
-
-int arch_reserve_bp_slot(struct perf_event *bp)
-{
-	int ret;
-
-	/* ptrace breakpoint */
-	if (is_ptrace_bp(bp)) {
-		if (all_cpu_bps_check(bp))
-			return -ENOSPC;
-
-		if (same_task_bps_check(bp))
-			return -ENOSPC;
-
-		return task_bps_add(bp);
-	}
-
-	/* perf breakpoint */
-	if (is_kernel_addr(bp->attr.bp_addr))
-		return 0;
-
-	if (bp->hw.target && bp->cpu == -1) {
-		if (same_task_bps_check(bp))
-			return -ENOSPC;
-
-		return task_bps_add(bp);
-	} else if (!bp->hw.target && bp->cpu != -1) {
-		if (all_task_bps_check(bp))
-			return -ENOSPC;
-
-		return cpu_bps_add(bp);
-	}
-
-	if (same_task_bps_check(bp))
-		return -ENOSPC;
-
-	ret = cpu_bps_add(bp);
-	if (ret)
-		return ret;
-	ret = task_bps_add(bp);
-	if (ret)
-		cpu_bps_remove(bp);
-
-	return ret;
-}
-
-void arch_release_bp_slot(struct perf_event *bp)
-{
-	if (!is_kernel_addr(bp->attr.bp_addr)) {
-		if (bp->hw.target)
-			task_bps_remove(bp);
-		if (bp->cpu != -1)
-			cpu_bps_remove(bp);
-	}
-}
-
 /*
  * Check for virtual address in kernel space.
  */
@@ -687,7 +440,7 @@ int hw_breakpoint_handler(struct die_args *args)
 	 */
 	if (ptrace_bp) {
 		for (i = 0; i < nr_wp_slots(); i++) {
-			if (!hit[i])
+			if (!hit[i] || !is_ptrace_bp(bp[i]))
 				continue;
 			perf_bp_event(bp[i], regs);
 			bp[i] = NULL;