Update Linux to v5.10.109
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz
Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/tools/lib/perf/mmap.c b/tools/lib/perf/mmap.c
new file mode 100644
index 0000000..79d5ed6
--- /dev/null
+++ b/tools/lib/perf/mmap.c
@@ -0,0 +1,275 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <sys/mman.h>
+#include <inttypes.h>
+#include <asm/bug.h>
+#include <errno.h>
+#include <string.h>
+#include <linux/ring_buffer.h>
+#include <linux/perf_event.h>
+#include <perf/mmap.h>
+#include <perf/event.h>
+#include <internal/mmap.h>
+#include <internal/lib.h>
+#include <linux/kernel.h>
+#include "internal.h"
+
+void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,
+ bool overwrite, libperf_unmap_cb_t unmap_cb)
+{
+ map->fd = -1;
+ map->overwrite = overwrite;
+ map->unmap_cb = unmap_cb;
+ refcount_set(&map->refcnt, 0);
+ if (prev)
+ prev->next = map;
+}
+
+size_t perf_mmap__mmap_len(struct perf_mmap *map)
+{
+ return map->mask + 1 + page_size;
+}
+
+int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
+ int fd, int cpu)
+{
+ map->prev = 0;
+ map->mask = mp->mask;
+ map->base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,
+ MAP_SHARED, fd, 0);
+ if (map->base == MAP_FAILED) {
+ map->base = NULL;
+ return -1;
+ }
+
+ map->fd = fd;
+ map->cpu = cpu;
+ return 0;
+}
+
+void perf_mmap__munmap(struct perf_mmap *map)
+{
+ if (map && map->base != NULL) {
+ munmap(map->base, perf_mmap__mmap_len(map));
+ map->base = NULL;
+ map->fd = -1;
+ refcount_set(&map->refcnt, 0);
+ }
+ if (map && map->unmap_cb)
+ map->unmap_cb(map);
+}
+
+void perf_mmap__get(struct perf_mmap *map)
+{
+ refcount_inc(&map->refcnt);
+}
+
+void perf_mmap__put(struct perf_mmap *map)
+{
+ BUG_ON(map->base && refcount_read(&map->refcnt) == 0);
+
+ if (refcount_dec_and_test(&map->refcnt))
+ perf_mmap__munmap(map);
+}
+
+static inline void perf_mmap__write_tail(struct perf_mmap *md, u64 tail)
+{
+ ring_buffer_write_tail(md->base, tail);
+}
+
+u64 perf_mmap__read_head(struct perf_mmap *map)
+{
+ return ring_buffer_read_head(map->base);
+}
+
+static bool perf_mmap__empty(struct perf_mmap *map)
+{
+ struct perf_event_mmap_page *pc = map->base;
+
+ return perf_mmap__read_head(map) == map->prev && !pc->aux_size;
+}
+
+void perf_mmap__consume(struct perf_mmap *map)
+{
+ if (!map->overwrite) {
+ u64 old = map->prev;
+
+ perf_mmap__write_tail(map, old);
+ }
+
+ if (refcount_read(&map->refcnt) == 1 && perf_mmap__empty(map))
+ perf_mmap__put(map);
+}
+
+static int overwrite_rb_find_range(void *buf, int mask, u64 *start, u64 *end)
+{
+ struct perf_event_header *pheader;
+ u64 evt_head = *start;
+ int size = mask + 1;
+
+ pr_debug2("%s: buf=%p, start=%"PRIx64"\n", __func__, buf, *start);
+ pheader = (struct perf_event_header *)(buf + (*start & mask));
+ while (true) {
+ if (evt_head - *start >= (unsigned int)size) {
+ pr_debug("Finished reading overwrite ring buffer: rewind\n");
+ if (evt_head - *start > (unsigned int)size)
+ evt_head -= pheader->size;
+ *end = evt_head;
+ return 0;
+ }
+
+ pheader = (struct perf_event_header *)(buf + (evt_head & mask));
+
+ if (pheader->size == 0) {
+ pr_debug("Finished reading overwrite ring buffer: get start\n");
+ *end = evt_head;
+ return 0;
+ }
+
+ evt_head += pheader->size;
+ pr_debug3("move evt_head: %"PRIx64"\n", evt_head);
+ }
+ WARN_ONCE(1, "Shouldn't get here\n");
+ return -1;
+}
+
+/*
+ * Report the start and end of the available data in ringbuffer
+ */
+static int __perf_mmap__read_init(struct perf_mmap *md)
+{
+ u64 head = perf_mmap__read_head(md);
+ u64 old = md->prev;
+ unsigned char *data = md->base + page_size;
+ unsigned long size;
+
+ md->start = md->overwrite ? head : old;
+ md->end = md->overwrite ? old : head;
+
+ if ((md->end - md->start) < md->flush)
+ return -EAGAIN;
+
+ size = md->end - md->start;
+ if (size > (unsigned long)(md->mask) + 1) {
+ if (!md->overwrite) {
+ WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n");
+
+ md->prev = head;
+ perf_mmap__consume(md);
+ return -EAGAIN;
+ }
+
+ /*
+ * Backward ring buffer is full. We still have a chance to read
+ * most of data from it.
+ */
+ if (overwrite_rb_find_range(data, md->mask, &md->start, &md->end))
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int perf_mmap__read_init(struct perf_mmap *map)
+{
+ /*
+ * Check if event was unmapped due to a POLLHUP/POLLERR.
+ */
+ if (!refcount_read(&map->refcnt))
+ return -ENOENT;
+
+ return __perf_mmap__read_init(map);
+}
+
+/*
+ * Mandatory for overwrite mode
+ * The direction of overwrite mode is backward.
+ * The last perf_mmap__read() will set tail to map->core.prev.
+ * Need to correct the map->core.prev to head which is the end of next read.
+ */
+void perf_mmap__read_done(struct perf_mmap *map)
+{
+ /*
+ * Check if event was unmapped due to a POLLHUP/POLLERR.
+ */
+ if (!refcount_read(&map->refcnt))
+ return;
+
+ map->prev = perf_mmap__read_head(map);
+}
+
+/* When check_messup is true, 'end' must points to a good entry */
+static union perf_event *perf_mmap__read(struct perf_mmap *map,
+ u64 *startp, u64 end)
+{
+ unsigned char *data = map->base + page_size;
+ union perf_event *event = NULL;
+ int diff = end - *startp;
+
+ if (diff >= (int)sizeof(event->header)) {
+ size_t size;
+
+ event = (union perf_event *)&data[*startp & map->mask];
+ size = event->header.size;
+
+ if (size < sizeof(event->header) || diff < (int)size)
+ return NULL;
+
+ /*
+ * Event straddles the mmap boundary -- header should always
+ * be inside due to u64 alignment of output.
+ */
+ if ((*startp & map->mask) + size != ((*startp + size) & map->mask)) {
+ unsigned int offset = *startp;
+ unsigned int len = min(sizeof(*event), size), cpy;
+ void *dst = map->event_copy;
+
+ do {
+ cpy = min(map->mask + 1 - (offset & map->mask), len);
+ memcpy(dst, &data[offset & map->mask], cpy);
+ offset += cpy;
+ dst += cpy;
+ len -= cpy;
+ } while (len);
+
+ event = (union perf_event *)map->event_copy;
+ }
+
+ *startp += size;
+ }
+
+ return event;
+}
+
+/*
+ * Read event from ring buffer one by one.
+ * Return one event for each call.
+ *
+ * Usage:
+ * perf_mmap__read_init()
+ * while(event = perf_mmap__read_event()) {
+ * //process the event
+ * perf_mmap__consume()
+ * }
+ * perf_mmap__read_done()
+ */
+union perf_event *perf_mmap__read_event(struct perf_mmap *map)
+{
+ union perf_event *event;
+
+ /*
+ * Check if event was unmapped due to a POLLHUP/POLLERR.
+ */
+ if (!refcount_read(&map->refcnt))
+ return NULL;
+
+ /* non-overwirte doesn't pause the ringbuffer */
+ if (!map->overwrite)
+ map->end = perf_mmap__read_head(map);
+
+ event = perf_mmap__read(map, &map->start, map->end);
+
+ if (!map->overwrite)
+ map->prev = map->start;
+
+ return event;
+}