perf/x86/intel/pt: Use helpers to obtain ToPA entry size

There are a few places in the PT driver that need to obtain the size of
a ToPA entry, some of them for the current ToPA entry in the buffer.
Use helpers for those, to make the lines shorter and more readable.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/20190821124727.73310-3-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index 9d9258f..f269875 100644 (file)
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -572,6 +572,7 @@ struct topa {
 
 /* make -1 stand for the last table entry */
 #define TOPA_ENTRY(t, i) ((i) == -1 ? &(t)->table[(t)->last] : &(t)->table[(i)])
+#define TOPA_ENTRY_SIZE(t, i) (sizes(TOPA_ENTRY((t), (i))->size))
 
 /**
  * topa_alloc() - allocate page-sized ToPA table
@@ -771,7 +772,7 @@ static void pt_update_head(struct pt *pt)
 
        /* offset of the current output region within this table */
        for (topa_idx = 0; topa_idx < buf->cur_idx; topa_idx++)
-               base += sizes(buf->cur->table[topa_idx].size);
+               base += TOPA_ENTRY_SIZE(buf->cur, topa_idx);
 
        if (buf->snapshot) {
                local_set(&buf->data_size, base);
@@ -800,7 +801,7 @@ static void *pt_buffer_region(struct pt_buffer *buf)
  */
 static size_t pt_buffer_region_size(struct pt_buffer *buf)
 {
-       return sizes(buf->cur->table[buf->cur_idx].size);
+       return TOPA_ENTRY_SIZE(buf->cur, buf->cur_idx);
 }
 
 /**
@@ -830,7 +831,7 @@ static void pt_handle_status(struct pt *pt)
                 * know.
                 */
                if (!intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries) ||
-                   buf->output_off == sizes(TOPA_ENTRY(buf->cur, buf->cur_idx)->size)) {
+                   buf->output_off == pt_buffer_region_size(buf)) {
                        perf_aux_output_flag(&pt->handle,
                                             PERF_AUX_FLAG_TRUNCATED);
                        advance++;
@@ -925,8 +926,7 @@ static int pt_buffer_reset_markers(struct pt_buffer *buf,
        unsigned long idx, npages, wakeup;
 
        /* can't stop in the middle of an output region */
-       if (buf->output_off + handle->size + 1 <
-           sizes(TOPA_ENTRY(buf->cur, buf->cur_idx)->size)) {
+       if (buf->output_off + handle->size + 1 < pt_buffer_region_size(buf)) {
                perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
                return -EINVAL;
        }
@@ -1032,7 +1032,7 @@ static void pt_buffer_reset_offsets(struct pt_buffer *buf, unsigned long head)
        buf->cur = (struct topa *)((unsigned long)buf->topa_index[pg] & PAGE_MASK);
        buf->cur_idx = ((unsigned long)buf->topa_index[pg] -
                        (unsigned long)buf->cur) / sizeof(struct topa_entry);
-       buf->output_off = head & (sizes(buf->cur->table[buf->cur_idx].size) - 1);
+       buf->output_off = head & (pt_buffer_region_size(buf) - 1);
 
        local64_set(&buf->head, head);
        local_set(&buf->data_size, 0);