perf: Fix mmap_page capabilities and docs

Complete the syscall-less self-profiling feature and address
all complaints, namely:

 - capabilities, so we can detect what is actually available at runtime

     Add a capabilities field to perf_event_mmap_page to indicate
     what is actually available for use.

 - on x86: RDPMC weirdness due to being 40/48 bits and not sign-extending
   properly.

 - ABI documentation as to how all this stuff works.

Also improve the documentation for the new features.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vweaver1@eecs.utk.edu>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1332433596.2487.33.camel@twins
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 73 insertions, 10 deletions

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 57ae485e80fc..ca9ed4e6a286 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -299,18 +299,31 @@ struct perf_event_mmap_page {
         /*
          * Bits needed to read the hw events in user-space.
          *
-         *   u32 seq;
-         *   s64 count;
+         *   u32 seq, time_mult, time_shift, idx, width;
+         *   u64 count, enabled, running;
+         *   u64 cyc, time_offset;
+         *   s64 pmc = 0;
          *
          *   do {
          *     seq = pc->lock;
-         *
          *     barrier()
-         *     if (pc->index) {
-         *       count = pmc_read(pc->index - 1);
-         *       count += pc->offset;
-         *     } else
-         *       goto regular_read;
+         *
+         *     enabled = pc->time_enabled;
+         *     running = pc->time_running;
+         *
+         *     if (pc->cap_usr_time && enabled != running) {
+         *       cyc = rdtsc();
+         *       time_offset = pc->time_offset;
+         *       time_mult   = pc->time_mult;
+         *       time_shift  = pc->time_shift;
+         *     }
+         *
+         *     idx = pc->index;
+         *     count = pc->offset;
+         *     if (pc->cap_usr_rdpmc && idx) {
+         *       width = pc->pmc_width;
+         *       pmc = rdpmc(idx - 1);
+         *     }
          *
          *     barrier();
          *   } while (pc->lock != seq);
@@ -323,14 +336,57 @@ struct perf_event_mmap_page {
         __s64   offset;                 /* add to hardware event value */
         __u64   time_enabled;           /* time event active */
         __u64   time_running;           /* time event on cpu */
-        __u32   time_mult, time_shift;
+        union {
+                __u64   capabilities;
+                __u64   cap_usr_time  : 1,
+                        cap_usr_rdpmc : 1,
+                        cap_____res   : 62;
+        };
+
+        /*
+         * If cap_usr_rdpmc this field provides the bit-width of the value
+         * read using the rdpmc() or equivalent instruction. This can be used
+         * to sign extend the result like:
+         *
+         *   pmc <<= 64 - width;
+         *   pmc >>= 64 - width; // signed shift right
+         *   count += pmc;
+         */
+        __u16   pmc_width;
+
+        /*
+         * If cap_usr_time the below fields can be used to compute the time
+         * delta since time_enabled (in ns) using rdtsc or similar.
+         *
+         *   u64 quot, rem;
+         *   u64 delta;
+         *
+         *   quot = (cyc >> time_shift);
+         *   rem = cyc & ((1 << time_shift) - 1);
+         *   delta = time_offset + quot * time_mult +
+         *              ((rem * time_mult) >> time_shift);
+         *
+         * Where time_offset,time_mult,time_shift and cyc are read in the
+         * seqcount loop described above. This delta can then be added to
+         * enabled and possible running (if idx), improving the scaling:
+         *
+         *   enabled += delta;
+         *   if (idx)
+         *     running += delta;
+         *
+         *   quot = count / running;
+         *   rem  = count % running;
+         *   count = quot * enabled + (rem * enabled) / running;
+         */
+        __u16   time_shift;
+        __u32   time_mult;
         __u64   time_offset;
 
                 /*
                  * Hole for extension of the self monitor capabilities
                  */
 
-        __u64   __reserved[121];        /* align to 1k */
+        __u64   __reserved[120];        /* align to 1k */
 
         /*
          * Control data for the mmap() data buffer.
@@ -347,6 +403,13 @@ struct perf_event_mmap_page {
         __u64   data_tail;              /* user-space written tail */
 };
 
+/*
+ * Build time assertion that we keep the data_head at the intended location.
+ * IOW, validation we got the __reserved[] size right.
+ */
+extern char __assert_mmap_data_head_offset
+        [1 - 2*!!(offsetof(struct perf_event_mmap_page, data_head) != 1024)];
+
 #define PERF_RECORD_MISC_CPUMODE_MASK           (7 << 0)
 #define PERF_RECORD_MISC_CPUMODE_UNKNOWN        (0 << 0)
 #define PERF_RECORD_MISC_KERNEL                 (1 << 0)