drm/i915/display: Cover all possible pipes in TP_printk()

Tracepoints that display frame and scanline counters for all pipes were
added with commit 1489bba82433 ("drm/i915: Add cxsr toggle tracepoint")
and commit 0b2599a43ca9 ("drm/i915: Add pipe enable/disable
tracepoints"). At that time, we only had pipes A, B and C. Now that we
can also have pipe D, the TP_printk() calls are missing it.

As a quick and dirty fix for that, let's define two common macros to be
used for the format and values respectively, and also ensure we raise a
build bug if more pipes are added to enum pipe.

In the future, we should probably have a way of printing information for
available pipes only.

Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241016135300.21428-6-gustavo.sousa@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display_trace.h b/drivers/gpu/drm/i915/display/intel_display_trace.h
index eec9aed..9bd8f1e 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_trace.h
+++ b/drivers/gpu/drm/i915/display/intel_display_trace.h
@@ -31,6 +31,29 @@
 #define _TRACE_PIPE_A  0
 #define _TRACE_PIPE_B  1
 #define _TRACE_PIPE_C  2
+#define _TRACE_PIPE_D  3
+
+/*
+ * FIXME: Several TP_printk() calls below display frame and scanline numbers for
+ * all possible pipes (regardless of whether they are available) and that is
+ * done with a constant format string. A better approach would be to generate
+ * that info dynamically based on available pipes, but, while we do not have
+ * that implemented yet, let's assert that the constant format string indeed
+ * covers all possible pipes.
+ */
+static_assert(I915_MAX_PIPES - 1 == _TRACE_PIPE_D);
+
+#define _PIPES_FRAME_AND_SCANLINE_FMT          \
+       "pipe A: frame=%u, scanline=%u"         \
+       ", pipe B: frame=%u, scanline=%u"       \
+       ", pipe C: frame=%u, scanline=%u"       \
+       ", pipe D: frame=%u, scanline=%u"
+
+#define _PIPES_FRAME_AND_SCANLINE_VALUES                                       \
+       __entry->frame[_TRACE_PIPE_A], __entry->scanline[_TRACE_PIPE_A]         \
+       , __entry->frame[_TRACE_PIPE_B], __entry->scanline[_TRACE_PIPE_B]       \
+       , __entry->frame[_TRACE_PIPE_C], __entry->scanline[_TRACE_PIPE_C]       \
+       , __entry->frame[_TRACE_PIPE_D], __entry->scanline[_TRACE_PIPE_D]
 
 /*
  * Paranoid sanity check that at least the enumeration starts at the
@@ -63,11 +86,8 @@ TRACE_EVENT(intel_pipe_enable,
                           __entry->pipe_name = pipe_name(crtc->pipe);
                           ),
 
-           TP_printk("dev %s, pipe %c enable, pipe A: frame=%u, scanline=%u, pipe B: frame=%u, scanline=%u, pipe C: frame=%u, scanline=%u",
-                     __get_str(dev), __entry->pipe_name,
-                     __entry->frame[_TRACE_PIPE_A], __entry->scanline[_TRACE_PIPE_A],
-                     __entry->frame[_TRACE_PIPE_B], __entry->scanline[_TRACE_PIPE_B],
-                     __entry->frame[_TRACE_PIPE_C], __entry->scanline[_TRACE_PIPE_C])
+           TP_printk("dev %s, pipe %c enable, " _PIPES_FRAME_AND_SCANLINE_FMT,
+                     __get_str(dev), __entry->pipe_name, _PIPES_FRAME_AND_SCANLINE_VALUES)
 );
 
 TRACE_EVENT(intel_pipe_disable,
@@ -96,11 +116,8 @@ TRACE_EVENT(intel_pipe_disable,
                           __entry->pipe_name = pipe_name(crtc->pipe);
                           ),
 
-           TP_printk("dev %s, pipe %c disable, pipe A: frame=%u, scanline=%u, pipe B: frame=%u, scanline=%u, pipe C: frame=%u, scanline=%u",
-                     __get_str(dev), __entry->pipe_name,
-                     __entry->frame[_TRACE_PIPE_A], __entry->scanline[_TRACE_PIPE_A],
-                     __entry->frame[_TRACE_PIPE_B], __entry->scanline[_TRACE_PIPE_B],
-                     __entry->frame[_TRACE_PIPE_C], __entry->scanline[_TRACE_PIPE_C])
+           TP_printk("dev %s, pipe %c disable, " _PIPES_FRAME_AND_SCANLINE_FMT,
+                     __get_str(dev), __entry->pipe_name, _PIPES_FRAME_AND_SCANLINE_VALUES)
 );
 
 TRACE_EVENT(intel_crtc_flip_done,
@@ -230,11 +247,9 @@ TRACE_EVENT(intel_memory_cxsr,
                           __entry->new = new;
                           ),
 
-           TP_printk("dev %s, cxsr %s->%s, pipe A: frame=%u, scanline=%u, pipe B: frame=%u, scanline=%u, pipe C: frame=%u, scanline=%u",
+           TP_printk("dev %s, cxsr %s->%s, " _PIPES_FRAME_AND_SCANLINE_FMT,
                      __get_str(dev), str_on_off(__entry->old), str_on_off(__entry->new),
-                     __entry->frame[_TRACE_PIPE_A], __entry->scanline[_TRACE_PIPE_A],
-                     __entry->frame[_TRACE_PIPE_B], __entry->scanline[_TRACE_PIPE_B],
-                     __entry->frame[_TRACE_PIPE_C], __entry->scanline[_TRACE_PIPE_C])
+                     _PIPES_FRAME_AND_SCANLINE_VALUES)
 );
 
 TRACE_EVENT(g4x_wm,