#ifndef __PERF_MAP_H
#define __PERF_MAP_H

#include <linux/atomic.h>
#include <linux/compiler.h>
#include <linux/list.h>
#include <linux/rbtree.h>
#include <pthread.h>
#include <stdio.h>
#include <stdbool.h>
#include <linux/types.h>

enum map_type {
	MAP__FUNCTION = 0,
	MAP__VARIABLE,
};

#define MAP__NR_TYPES (MAP__VARIABLE + 1)

extern const char *map_type__name[MAP__NR_TYPES];

struct dso;
struct ip_callchain;
struct ref_reloc_sym;
struct map_groups;
struct machine;
struct perf_evsel;

struct map {
	union {
		struct rb_node	rb_node;
		struct list_head node;
	};
	u64			start;
	u64			end;
	u8 /* enum map_type */	type;
	bool			erange_warned;
	u32			priv;
	u32			prot;
	u32			flags;
	u64			pgoff;
	u64			reloc;
	u32			maj, min; /* only valid for MMAP2 record */
	u64			ino;      /* only valid for MMAP2 record */
	u64			ino_generation;/* only valid for MMAP2 record */

	/* ip -> dso rip */
	u64			(*map_ip)(struct map *, u64);
	/* dso rip -> ip */
	u64			(*unmap_ip)(struct map *, u64);

	struct dso		*dso;
	struct map_groups	*groups;
	atomic_t		refcnt;
};

struct kmap {
	struct ref_reloc_sym	*ref_reloc_sym;
	struct map_groups	*kmaps;
};

struct maps {
	struct rb_root	 entries;
	pthread_rwlock_t lock;
};

struct map_groups {
	struct maps	 maps[MAP__NR_TYPES];
	struct machine	 *machine;
	atomic_t	 refcnt;
};

struct map_groups *map_groups__new(struct machine *machine);
void map_groups__delete(struct map_groups *mg);
bool map_groups__empty(struct map_groups *mg);

static inline struct map_groups *map_groups__get(struct map_groups *mg)
{
	if (mg)
		atomic_inc(&mg->refcnt);
	return mg;
}

void map_groups__put(struct map_groups *mg);

struct kmap *map__kmap(struct map *map);
struct map_groups *map__kmaps(struct map *map);

static inline u64 map__map_ip(struct map *map, u64 ip)
{
	return ip - map->start + map->pgoff;
}

static inline u64 map__unmap_ip(struct map *map, u64 ip)
{
	return ip + map->start - map->pgoff;
}

static inline u64 identity__map_ip(struct map *map __maybe_unused, u64 ip)
{
	return ip;
}


/* rip/ip <-> addr suitable for passing to `objdump --start-address=` */
u64 map__rip_2objdump(struct map *map, u64 rip);

/* objdump address -> memory address */
u64 map__objdump_2mem(struct map *map, u64 ip);

struct symbol;
struct thread;

/* map__for_each_symbol - iterate over the symbols in the given map
 *
 * @map: the 'struct map *' in which symbols itereated
 * @pos: the 'struct symbol *' to use as a loop cursor
 * @n: the 'struct rb_node *' to use as a temporary storage
 * Note: caller must ensure map->dso is not NULL (map is loaded).
 */
#define map__for_each_symbol(map, pos, n)	\
	dso__for_each_symbol(map->dso, pos, n, map->type)

/* map__for_each_symbol_with_name - iterate over the symbols in the given map
 *                                  that have the given name
 *
 * @map: the 'struct map *' in which symbols itereated
 * @sym_name: the symbol name
 * @pos: the 'struct symbol *' to use as a loop cursor
 */
#define __map__for_each_symbol_by_name(map, sym_name, pos)	\
	for (pos = map__find_symbol_by_name(map, sym_name);	\
	     pos && arch__compare_symbol_names(pos->name, sym_name) == 0;	\
	     pos = symbol__next_by_name(pos))

#define map__for_each_symbol_by_name(map, sym_name, pos)		\
	__map__for_each_symbol_by_name(map, sym_name, (pos))

int arch__compare_symbol_names(const char *namea, const char *nameb);
void map__init(struct map *map, enum map_type type,
	       u64 start, u64 end, u64 pgoff, struct dso *dso);
struct map *map__new(struct machine *machine, u64 start, u64 len,
		     u64 pgoff, u32 pid, u32 d_maj, u32 d_min, u64 ino,
		     u64 ino_gen, u32 prot, u32 flags,
		     char *filename, enum map_type type, struct thread *thread);
struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
void map__delete(struct map *map);
struct map *map__clone(struct map *map);

static inline struct map *map__get(struct map *map)
{
	if (map)
		atomic_inc(&map->refcnt);
	return map;
}

void map__put(struct map *map);

static inline void __map__zput(struct map **map)
{
	map__put(*map);
	*map = NULL;
}

#define map__zput(map) __map__zput(&map)

int map__overlap(struct map *l, struct map *r);
size_t map__fprintf(struct map *map, FILE *fp);
size_t map__fprintf_dsoname(struct map *map, FILE *fp);
int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
			 FILE *fp);

int map__load(struct map *map);
struct symbol *map__find_symbol(struct map *map, u64 addr);
struct symbol *map__find_symbol_by_name(struct map *map, const char *name);
void map__fixup_start(struct map *map);
void map__fixup_end(struct map *map);

void map__reloc_vmlinux(struct map *map);

size_t __map_groups__fprintf_maps(struct map_groups *mg, enum map_type type,
				  FILE *fp);
void maps__insert(struct maps *maps, struct map *map);
void maps__remove(struct maps *maps, struct map *map);
struct map *maps__find(struct maps *maps, u64 addr);
struct map *maps__first(struct maps *maps);
struct map *map__next(struct map *map);
struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name,
                                         struct map **mapp);
void map_groups__init(struct map_groups *mg, struct machine *machine);
void map_groups__exit(struct map_groups *mg);
int map_groups__clone(struct thread *thread,
		      struct map_groups *parent, enum map_type type);
size_t map_groups__fprintf(struct map_groups *mg, FILE *fp);

int maps__set_kallsyms_ref_reloc_sym(struct map **maps, const char *symbol_name,
				     u64 addr);

static inline void map_groups__insert(struct map_groups *mg, struct map *map)
{
	maps__insert(&mg->maps[map->type], map);
	map->groups = mg;
}

static inline void map_groups__remove(struct map_groups *mg, struct map *map)
{
	maps__remove(&mg->maps[map->type], map);
}

static inline struct map *map_groups__find(struct map_groups *mg,
					   enum map_type type, u64 addr)
{
	return maps__find(&mg->maps[type], addr);
}

static inline struct map *map_groups__first(struct map_groups *mg,
					    enum map_type type)
{
	return maps__first(&mg->maps[type]);
}

static inline struct map *map_groups__next(struct map *map)
{
	return map__next(map);
}

struct symbol *map_groups__find_symbol(struct map_groups *mg,
				       enum map_type type, u64 addr,
				       struct map **mapp);

struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg,
					       enum map_type type,
					       const char *name,
					       struct map **mapp);

struct addr_map_symbol;

int map_groups__find_ams(struct addr_map_symbol *ams);

static inline
struct symbol *map_groups__find_function_by_name(struct map_groups *mg,
						 const char *name, struct map **mapp)
{
	return map_groups__find_symbol_by_name(mg, MAP__FUNCTION, name, mapp);
}

int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map,
				   FILE *fp);

struct map *map_groups__find_by_name(struct map_groups *mg,
				     enum map_type type, const char *name);

bool __map__is_kernel(const struct map *map);

static inline bool __map__is_kmodule(const struct map *map)
{
	return !__map__is_kernel(map);
}

#endif /* __PERF_MAP_H */
/0x460
    fbcon_blank+0x30f/0x350
    do_unblank_screen+0xd2/0x1a0
    vt_ioctl+0x507/0x12a0
    tty_ioctl+0x355/0xc30
    do_vfs_ioctl+0xa3/0x5e0
    SyS_ioctl+0x79/0x90
    entry_SYSCALL_64_fastpath+0x13/0x94

 - i915 unpin_work workqueue:

    intel_unpin_work_fn+0x58/0x140 [i915]
    process_one_work+0x1f1/0x480
    worker_thread+0x48/0x4d0
    kthread+0x101/0x140

and this patch purely papers over the issue by adding a NULL pointer
check and a WARN_ON_ONCE() to avoid the oops that would then generally
make the machine unresponsive.

Other callers of i915_gem_object_to_ggtt() seem to also check for the
returned pointer being NULL and warn about it, so this clearly has
happened before in other places.

[ Reported it originally to the i915 developers on Jan 8, applying the
  ugly workaround on my own now after triggering the problem for the
  second time with no feedback.

  This is likely to be the same bug reported as

     https://bugs.freedesktop.org/show_bug.cgi?id=98829
     https://bugs.freedesktop.org/show_bug.cgi?id=99134

  which has a patch for the underlying problem, but it hasn't gotten to
  me, so I'm applying the workaround. ]

Cc: Daniel Vetter &lt;daniel.vetter@intel.com&gt;
Cc: Jani Nikula &lt;jani.nikula@linux.intel.com&gt;
Cc: Ville Syrjälä &lt;ville.syrjala@linux.intel.com&gt;
Cc: Chris Wilson &lt;chris@chris-wilson.co.uk&gt;
Cc: Maarten Lankhorst &lt;maarten.lankhorst@linux.intel.com&gt;
Cc: Tvrtko Ursulin &lt;tvrtko.ursulin@intel.com&gt;
Cc: Imre Deak &lt;imre.deak@intel.com&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>Diffstat</a> (limited to 'include/trace/events/host1x.h')</div><table summary='diffstat' class='diffstat'>