More arm64 fixes

- Reject CHAIN PMU events when they are not part of a 64-bit counter
 
 - Fix WARN_ON_ONCE() that triggers for reserved regions that don't
   correspond to mapped memory
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Will writes:
  "More arm64 fixes

   - Reject CHAIN PMU events when they are not part of a 64-bit counter

   - Fix WARN_ON_ONCE() that triggers for reserved regions that don't
     correspond to mapped memory"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: perf: Reject stand-alone CHAIN events for PMUv3
  arm64: Fix /proc/iomem for reserved but not memory regions

arch/arm64/kernel/perf_event.c

@@ -966,6 +966,12 @@ static int armv8pmu_set_event_filter(struct hw_perf_event *event,
 	return 0;
 }
 
+static int armv8pmu_filter_match(struct perf_event *event)
+{
+	unsigned long evtype = event->hw.config_base & ARMV8_PMU_EVTYPE_EVENT;
+	return evtype != ARMV8_PMUV3_PERFCTR_CHAIN;
+}
+
 static void armv8pmu_reset(void *info)
 {
 	struct arm_pmu *cpu_pmu = (struct arm_pmu *)info;
@@ -1114,6 +1120,7 @@ static int armv8_pmu_init(struct arm_pmu *cpu_pmu)
 	cpu_pmu->stop			= armv8pmu_stop,
 	cpu_pmu->reset			= armv8pmu_reset,
 	cpu_pmu->set_event_filter	= armv8pmu_set_event_filter;
+	cpu_pmu->filter_match		= armv8pmu_filter_match;
 
 	return 0;
 }

arch/arm64/kernel/setup.c

@@ -64,6 +64,9 @@
 #include <asm/xen/hypervisor.h>
 #include <asm/mmu_context.h>
 
+static int num_standard_resources;
+static struct resource *standard_resources;
+
 phys_addr_t __fdt_pointer __initdata;
 
 /*
@@ -206,14 +209,19 @@ static void __init request_standard_resources(void)
 {
 	struct memblock_region *region;
 	struct resource *res;
+	unsigned long i = 0;
 
 	kernel_code.start   = __pa_symbol(_text);
 	kernel_code.end     = __pa_symbol(__init_begin - 1);
 	kernel_data.start   = __pa_symbol(_sdata);
 	kernel_data.end     = __pa_symbol(_end - 1);
 
+	num_standard_resources = memblock.memory.cnt;
+	standard_resources = alloc_bootmem_low(num_standard_resources *
+					       sizeof(*standard_resources));
+
 	for_each_memblock(memory, region) {
-		res = alloc_bootmem_low(sizeof(*res));
+		res = &standard_resources[i++];
 		if (memblock_is_nomap(region)) {
 			res->name  = "reserved";
 			res->flags = IORESOURCE_MEM;
@@ -243,36 +251,26 @@ static void __init request_standard_resources(void)
 
 static int __init reserve_memblock_reserved_regions(void)
 {
-	phys_addr_t start, end, roundup_end = 0;
-	struct resource *mem, *res;
-	u64 i;
+	u64 i, j;
 
-	for_each_reserved_mem_region(i, &start, &end) {
-		if (end <= roundup_end)
-			continue; /* done already */
+	for (i = 0; i < num_standard_resources; ++i) {
+		struct resource *mem = &standard_resources[i];
+		phys_addr_t r_start, r_end, mem_size = resource_size(mem);
 
-		start = __pfn_to_phys(PFN_DOWN(start));
-		end = __pfn_to_phys(PFN_UP(end)) - 1;
-		roundup_end = end;
-
-		res = kzalloc(sizeof(*res), GFP_ATOMIC);
-		if (WARN_ON(!res))
-			return -ENOMEM;
-		res->start = start;
-		res->end = end;
-		res->name  = "reserved";
-		res->flags = IORESOURCE_MEM;
-
-		mem = request_resource_conflict(&iomem_resource, res);
-		/*
-		 * We expected memblock_reserve() regions to conflict with
-		 * memory created by request_standard_resources().
-		 */
-		if (WARN_ON_ONCE(!mem))
+		if (!memblock_is_region_reserved(mem->start, mem_size))
 			continue;
-		kfree(res);
 
-		reserve_region_with_split(mem, start, end, "reserved");
+		for_each_reserved_mem_region(j, &r_start, &r_end) {
+			resource_size_t start, end;
+
+			start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
+			end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
+
+			if (start > mem->end || end < mem->start)
+				continue;
+
+			reserve_region_with_split(mem, start, end, "reserved");
+		}
 	}
 
 	return 0;

drivers/perf/arm_pmu.c

@@ -485,7 +485,13 @@ static int armpmu_filter_match(struct perf_event *event)
 {
 	struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
 	unsigned int cpu = smp_processor_id();
-	return cpumask_test_cpu(cpu, &armpmu->supported_cpus);
+	int ret;
+
+	ret = cpumask_test_cpu(cpu, &armpmu->supported_cpus);
+	if (ret && armpmu->filter_match)
+		return armpmu->filter_match(event);
+
+	return ret;
 }
 
 static ssize_t armpmu_cpumask_show(struct device *dev,

include/linux/perf/arm_pmu.h

@@ -99,6 +99,7 @@ struct arm_pmu {
 	void		(*stop)(struct arm_pmu *);
 	void		(*reset)(void *);
 	int		(*map_event)(struct perf_event *event);
+	int		(*filter_match)(struct perf_event *event);
 	int		num_events;
 	bool		secure_access; /* 32-bit ARM only */
 #define ARMV8_PMUV3_MAX_COMMON_EVENTS 0x40