drm/i915: Nuke display error state

I doubt anyone has used the display error state since CS flips
went the way of the dodo. Just nuke it.

It might be semi interesting to have something like this for
FIFO underruns and the like, but as it stands this wouldn't
provide a sufficient amount of information. So would need
an extensive rewrite anyway.

The lockless power well handling is also racy, so this could
just be contributing noise to test results if we end up
accessing something with the relevant power well already
disabled.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210505191140.14215-1-ville.syrjala@linux.intel.comAcked-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_display.c

@@ -12978,207 +12978,3 @@ void intel_display_driver_unregister(struct drm_i915_private *i915)
 	acpi_video_unregister();
 	intel_opregion_unregister(i915);
 }
-
-#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
-
-struct intel_display_error_state {
-
-	u32 power_well_driver;
-
-	struct intel_cursor_error_state {
-		u32 control;
-		u32 position;
-		u32 base;
-		u32 size;
-	} cursor[I915_MAX_PIPES];
-
-	struct intel_pipe_error_state {
-		bool power_domain_on;
-		u32 source;
-		u32 stat;
-	} pipe[I915_MAX_PIPES];
-
-	struct intel_plane_error_state {
-		u32 control;
-		u32 stride;
-		u32 size;
-		u32 pos;
-		u32 addr;
-		u32 surface;
-		u32 tile_offset;
-	} plane[I915_MAX_PIPES];
-
-	struct intel_transcoder_error_state {
-		bool available;
-		bool power_domain_on;
-		enum transcoder cpu_transcoder;
-
-		u32 conf;
-
-		u32 htotal;
-		u32 hblank;
-		u32 hsync;
-		u32 vtotal;
-		u32 vblank;
-		u32 vsync;
-	} transcoder[5];
-};
-
-struct intel_display_error_state *
-intel_display_capture_error_state(struct drm_i915_private *dev_priv)
-{
-	struct intel_display_error_state *error;
-	int transcoders[] = {
-		TRANSCODER_A,
-		TRANSCODER_B,
-		TRANSCODER_C,
-		TRANSCODER_D,
-		TRANSCODER_EDP,
-	};
-	int i;
-
-	BUILD_BUG_ON(ARRAY_SIZE(transcoders) != ARRAY_SIZE(error->transcoder));
-
-	if (!HAS_DISPLAY(dev_priv))
-		return NULL;
-
-	error = kzalloc(sizeof(*error), GFP_ATOMIC);
-	if (error == NULL)
-		return NULL;
-
-	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
-		error->power_well_driver = intel_de_read(dev_priv,
-							 HSW_PWR_WELL_CTL2);
-
-	for_each_pipe(dev_priv, i) {
-		error->pipe[i].power_domain_on =
-			__intel_display_power_is_enabled(dev_priv,
-							 POWER_DOMAIN_PIPE(i));
-		if (!error->pipe[i].power_domain_on)
-			continue;
-
-		error->cursor[i].control = intel_de_read(dev_priv, CURCNTR(i));
-		error->cursor[i].position = intel_de_read(dev_priv, CURPOS(i));
-		error->cursor[i].base = intel_de_read(dev_priv, CURBASE(i));
-
-		error->plane[i].control = intel_de_read(dev_priv, DSPCNTR(i));
-		error->plane[i].stride = intel_de_read(dev_priv, DSPSTRIDE(i));
-		if (DISPLAY_VER(dev_priv) <= 3) {
-			error->plane[i].size = intel_de_read(dev_priv,
-							     DSPSIZE(i));
-			error->plane[i].pos = intel_de_read(dev_priv,
-							    DSPPOS(i));
-		}
-		if (DISPLAY_VER(dev_priv) <= 7 && !IS_HASWELL(dev_priv))
-			error->plane[i].addr = intel_de_read(dev_priv,
-							     DSPADDR(i));
-		if (DISPLAY_VER(dev_priv) >= 4) {
-			error->plane[i].surface = intel_de_read(dev_priv,
-								DSPSURF(i));
-			error->plane[i].tile_offset = intel_de_read(dev_priv,
-								    DSPTILEOFF(i));
-		}
-
-		error->pipe[i].source = intel_de_read(dev_priv, PIPESRC(i));
-
-		if (HAS_GMCH(dev_priv))
-			error->pipe[i].stat = intel_de_read(dev_priv,
-							    PIPESTAT(i));
-	}
-
-	for (i = 0; i < ARRAY_SIZE(error->transcoder); i++) {
-		enum transcoder cpu_transcoder = transcoders[i];
-
-		if (!HAS_TRANSCODER(dev_priv, cpu_transcoder))
-			continue;
-
-		error->transcoder[i].available = true;
-		error->transcoder[i].power_domain_on =
-			__intel_display_power_is_enabled(dev_priv,
-				POWER_DOMAIN_TRANSCODER(cpu_transcoder));
-		if (!error->transcoder[i].power_domain_on)
-			continue;
-
-		error->transcoder[i].cpu_transcoder = cpu_transcoder;
-
-		error->transcoder[i].conf = intel_de_read(dev_priv,
-							  PIPECONF(cpu_transcoder));
-		error->transcoder[i].htotal = intel_de_read(dev_priv,
-							    HTOTAL(cpu_transcoder));
-		error->transcoder[i].hblank = intel_de_read(dev_priv,
-							    HBLANK(cpu_transcoder));
-		error->transcoder[i].hsync = intel_de_read(dev_priv,
-							   HSYNC(cpu_transcoder));
-		error->transcoder[i].vtotal = intel_de_read(dev_priv,
-							    VTOTAL(cpu_transcoder));
-		error->transcoder[i].vblank = intel_de_read(dev_priv,
-							    VBLANK(cpu_transcoder));
-		error->transcoder[i].vsync = intel_de_read(dev_priv,
-							   VSYNC(cpu_transcoder));
-	}
-
-	return error;
-}
-
-#define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
-
-void
-intel_display_print_error_state(struct drm_i915_error_state_buf *m,
-				struct intel_display_error_state *error)
-{
-	struct drm_i915_private *dev_priv = m->i915;
-	int i;
-
-	if (!error)
-		return;
-
-	err_printf(m, "Num Pipes: %d\n", INTEL_NUM_PIPES(dev_priv));
-	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
-		err_printf(m, "PWR_WELL_CTL2: %08x\n",
-			   error->power_well_driver);
-	for_each_pipe(dev_priv, i) {
-		err_printf(m, "Pipe [%d]:\n", i);
-		err_printf(m, "  Power: %s\n",
-			   onoff(error->pipe[i].power_domain_on));
-		err_printf(m, "  SRC: %08x\n", error->pipe[i].source);
-		err_printf(m, "  STAT: %08x\n", error->pipe[i].stat);
-
-		err_printf(m, "Plane [%d]:\n", i);
-		err_printf(m, "  CNTR: %08x\n", error->plane[i].control);
-		err_printf(m, "  STRIDE: %08x\n", error->plane[i].stride);
-		if (DISPLAY_VER(dev_priv) <= 3) {
-			err_printf(m, "  SIZE: %08x\n", error->plane[i].size);
-			err_printf(m, "  POS: %08x\n", error->plane[i].pos);
-		}
-		if (DISPLAY_VER(dev_priv) <= 7 && !IS_HASWELL(dev_priv))
-			err_printf(m, "  ADDR: %08x\n", error->plane[i].addr);
-		if (DISPLAY_VER(dev_priv) >= 4) {
-			err_printf(m, "  SURF: %08x\n", error->plane[i].surface);
-			err_printf(m, "  TILEOFF: %08x\n", error->plane[i].tile_offset);
-		}
-
-		err_printf(m, "Cursor [%d]:\n", i);
-		err_printf(m, "  CNTR: %08x\n", error->cursor[i].control);
-		err_printf(m, "  POS: %08x\n", error->cursor[i].position);
-		err_printf(m, "  BASE: %08x\n", error->cursor[i].base);
-	}
-
-	for (i = 0; i < ARRAY_SIZE(error->transcoder); i++) {
-		if (!error->transcoder[i].available)
-			continue;
-
-		err_printf(m, "CPU transcoder: %s\n",
-			   transcoder_name(error->transcoder[i].cpu_transcoder));
-		err_printf(m, "  Power: %s\n",
-			   onoff(error->transcoder[i].power_domain_on));
-		err_printf(m, "  CONF: %08x\n", error->transcoder[i].conf);
-		err_printf(m, "  HTOTAL: %08x\n", error->transcoder[i].htotal);
-		err_printf(m, "  HBLANK: %08x\n", error->transcoder[i].hblank);
-		err_printf(m, "  HSYNC: %08x\n", error->transcoder[i].hsync);
-		err_printf(m, "  VTOTAL: %08x\n", error->transcoder[i].vtotal);
-		err_printf(m, "  VBLANK: %08x\n", error->transcoder[i].vblank);
-		err_printf(m, "  VSYNC: %08x\n", error->transcoder[i].vsync);
-	}
-}
-
-#endif

drivers/gpu/drm/i915/display/intel_display.h

@@ -37,7 +37,6 @@ struct drm_encoder;
 struct drm_file;
 struct drm_format_info;
 struct drm_framebuffer;
-struct drm_i915_error_state_buf;
 struct drm_i915_gem_object;
 struct drm_i915_private;
 struct drm_mode_fb_cmd2;
@@ -611,11 +610,6 @@ void ilk_pfit_disable(const struct intel_crtc_state *old_crtc_state);
 int bdw_get_pipemisc_bpp(struct intel_crtc *crtc);
 unsigned int intel_plane_fence_y_offset(const struct intel_plane_state *plane_state);
 
-struct intel_display_error_state *
-intel_display_capture_error_state(struct drm_i915_private *dev_priv);
-void intel_display_print_error_state(struct drm_i915_error_state_buf *e,
-				     struct intel_display_error_state *error);
-
 bool
 intel_format_info_is_yuv_semiplanar(const struct drm_format_info *info,
 				    u64 modifier);

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -36,7 +36,6 @@
 
 #include <drm/drm_print.h>
 
-#include "display/intel_atomic.h"
 #include "display/intel_csr.h"
 #include "display/intel_overlay.h"
 
@@ -808,9 +807,6 @@ static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
 	if (error->overlay)
 		intel_overlay_print_error_state(m, error->overlay);
 
-	if (error->display)
-		intel_display_print_error_state(m, error->display);
-
 	err_print_capabilities(m, error);
 	err_print_params(m, &error->params);
 }
@@ -974,7 +970,6 @@ void __i915_gpu_coredump_free(struct kref *error_ref)
 	}
 
 	kfree(error->overlay);
-	kfree(error->display);
 
 	cleanup_params(error);
 
@@ -1826,7 +1821,6 @@ i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask)
 	}
 
 	error->overlay = intel_overlay_capture_error_state(i915);
-	error->display = intel_display_capture_error_state(i915);
 
 	return error;
 }

drivers/gpu/drm/i915/i915_gpu_error.h

@@ -29,7 +29,6 @@ struct drm_i915_private;
 struct i915_vma_compress;
 struct intel_engine_capture_vma;
 struct intel_overlay_error_state;
-struct intel_display_error_state;
 
 struct i915_vma_coredump {
 	struct i915_vma_coredump *next;
@@ -182,7 +181,6 @@ struct i915_gpu_coredump {
 	struct i915_params params;
 
 	struct intel_overlay_error_state *overlay;
-	struct intel_display_error_state *display;
 
 	struct scatterlist *sgl, *fit;
 };