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drm/i915/display: Zero-initialize frame/scanline counts in tracepoints

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In an upcoming change, we will also add support for logging
frame/scanline counts for pipe D in relevant tracepoints.

In [1], Matt mentioned the possibility of having garbage in those counts
for pipe D on a platform containing only 3 pipes. Indeed, it has been
verified that the counts for the extra pipe would not be
zero-initialized by the tracing system.

Since it is also possible that the same would happen for a fused-off
pipe, let's go ahead and add the logic to zero-initialize the arrays
now.

[1] https://lore.kernel.org/all/20240918224927.GU5091@mdroper-desk1.amr.corp.intel.com/

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/20241016135300.21428-3-gustavo.sousa@intel.com
This commit is contained in:
Gustavo Sousa
2024-10-16 10:52:28 -03:00
parent dba8bed8b6
commit 85c5cad1bf
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/i915/display/intel_display_trace.h
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@@ -9,6 +9,7 @@
#if !defined(__INTEL_DISPLAY_TRACE_H__) || defined(TRACE_HEADER_MULTI_READ)
#define __INTEL_DISPLAY_TRACE_H__
#include <linux/string.h>
#include <linux/string_helpers.h>
#include <linux/types.h>
#include <linux/tracepoint.h>
@@ -36,6 +37,10 @@ TRACE_EVENT(intel_pipe_enable,
struct intel_display *display = to_intel_display(crtc);
struct intel_crtc *it__;
__assign_str(dev);
memset(__entry->frame, 0,
sizeof(__entry->frame[0]) * I915_MAX_PIPES);
memset(__entry->scanline, 0,
sizeof(__entry->scanline[0]) * I915_MAX_PIPES);
for_each_intel_crtc(display->drm, it__) {
__entry->frame[it__->pipe] = intel_crtc_get_vblank_counter(it__);
__entry->scanline[it__->pipe] = intel_get_crtc_scanline(it__);
@@ -65,6 +70,10 @@ TRACE_EVENT(intel_pipe_disable,
struct intel_display *display = to_intel_display(crtc);
struct intel_crtc *it__;
__assign_str(dev);
memset(__entry->frame, 0,
sizeof(__entry->frame[0]) * I915_MAX_PIPES);
memset(__entry->scanline, 0,
sizeof(__entry->scanline[0]) * I915_MAX_PIPES);
for_each_intel_crtc(display->drm, it__) {
__entry->frame[it__->pipe] = intel_crtc_get_vblank_counter(it__);
__entry->scanline[it__->pipe] = intel_get_crtc_scanline(it__);
@@ -194,6 +203,10 @@ TRACE_EVENT(intel_memory_cxsr,
TP_fast_assign(
struct intel_crtc *crtc;
__assign_str(dev);
memset(__entry->frame, 0,
sizeof(__entry->frame[0]) * I915_MAX_PIPES);
memset(__entry->scanline, 0,
sizeof(__entry->scanline[0]) * I915_MAX_PIPES);
for_each_intel_crtc(display->drm, crtc) {
__entry->frame[crtc->pipe] = intel_crtc_get_vblank_counter(crtc);
__entry->scanline[crtc->pipe] = intel_get_crtc_scanline(crtc);