RE: [PATCHv5 06/10] drm/i915/histogram: histogram interrupt handling

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> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Arun
> R Murthy
> Sent: Tuesday, December 3, 2024 11:25 AM
> To: intel-xe@xxxxxxxxxxxxxxxxxxxxx; intel-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-
> devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: Murthy, Arun R <arun.r.murthy@xxxxxxxxx>
> Subject: [PATCHv5 06/10] drm/i915/histogram: histogram interrupt handling
> 
> Upon enabling histogram an interrupt is trigerred after the generation of the
> statistics. This patch registers the histogram interrupt and handles the
> interrupt.
> 
> v2: Added intel_crtc backpointer to intel_histogram struct (Jani)
>     Removed histogram_wq and instead use dev_priv->unodered_eq (Jani)
> v3: Replaced drm_i915_private with intel_display (Suraj)
>     Refactored the histogram read code (Jani)
> v4: Rebased after addressing comments on patch 1
> v5: removed the retry logic and moved to patch7 (Jani)
> 
> Signed-off-by: Arun R Murthy <arun.r.murthy@xxxxxxxxx>
> ---
>  .../gpu/drm/i915/display/intel_display_irq.c  |  6 +-
>  .../gpu/drm/i915/display/intel_histogram.c    | 87 ++++++++++++++++++-
>  .../gpu/drm/i915/display/intel_histogram.h    |  3 +
>  drivers/gpu/drm/i915/i915_reg.h               |  5 +-
>  4 files changed, 96 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c
> b/drivers/gpu/drm/i915/display/intel_display_irq.c
> index cb79c2796e3a..9eaca7125bf7 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_irq.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_irq.c
> @@ -20,6 +20,7 @@
>  #include "intel_fdi_regs.h"
>  #include "intel_fifo_underrun.h"
>  #include "intel_gmbus.h"
> +#include "intel_histogram.h"
>  #include "intel_hotplug_irq.h"
>  #include "intel_pipe_crc_regs.h"
>  #include "intel_pmdemand.h"
> @@ -1180,6 +1181,9 @@ void gen8_de_irq_handler(struct drm_i915_private
> *dev_priv, u32 master_ctl)
>  		if (iir & GEN8_PIPE_FIFO_UNDERRUN)
>  			intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);
> 
> +		if (iir & GEN9_PIPE_HISTOGRAM_EVENT)
> +			intel_histogram_irq_handler(display, pipe);
> +
>  		fault_errors = iir & gen8_de_pipe_fault_mask(dev_priv);
>  		if (fault_errors)
>  			drm_err_ratelimited(&dev_priv->drm,
> @@ -1774,7 +1778,7 @@ void gen8_de_irq_postinstall(struct
> drm_i915_private *dev_priv)
>  	struct intel_uncore *uncore = &dev_priv->uncore;
> 
>  	u32 de_pipe_masked = gen8_de_pipe_fault_mask(dev_priv) |
> -		GEN8_PIPE_CDCLK_CRC_DONE;
> +		GEN8_PIPE_CDCLK_CRC_DONE |
> GEN9_PIPE_HISTOGRAM_EVENT;
>  	u32 de_pipe_enables;
>  	u32 de_port_masked = gen8_de_port_aux_mask(dev_priv);
>  	u32 de_port_enables;
> diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c
> b/drivers/gpu/drm/i915/display/intel_histogram.c
> index e9a431800553..57bb45b36a03 100644
> --- a/drivers/gpu/drm/i915/display/intel_histogram.c
> +++ b/drivers/gpu/drm/i915/display/intel_histogram.c
> @@ -19,7 +19,7 @@
>  #define HISTOGRAM_GUARDBAND_THRESHOLD_DEFAULT 300
>  /* Precision factor for threshold guardband */  #define
> HISTOGRAM_GUARDBAND_PRECISION_FACTOR 10000 -#define
> HISTOGRAM_DEFAULT_GUARDBAND_DELAY 0x04
> +#define HISTOGRAM_BIN_READ_RETRY_COUNT 5
> 
>  struct intel_histogram {
>  	struct intel_crtc *crtc;
> @@ -29,6 +29,84 @@ struct intel_histogram {
>  	u32 bin_data[HISTOGRAM_BIN_COUNT];
>  };
> 
> +static bool intel_histogram_get_data(struct intel_crtc *intel_crtc) {
> +	struct intel_display *display = to_intel_display(intel_crtc);
> +	struct intel_histogram *histogram = intel_crtc->histogram;
> +	int index;
> +	u32 dpstbin;
> +
> +	for (index = 0; index < ARRAY_SIZE(histogram->bin_data); index++) {
> +		dpstbin = intel_de_read(display, DPST_BIN(intel_crtc->pipe));
> +		if (!(dpstbin & DPST_BIN_BUSY)) {
> +			histogram->bin_data[index] = dpstbin &
> DPST_BIN_DATA_MASK;
> +		} else
> +			return false;
> +	}
> +	return true;
> +}
> +
> +static void intel_histogram_handle_int_work(struct work_struct *work) {
> +	struct intel_histogram *histogram = container_of(work,
> +		struct intel_histogram, work.work);
> +	struct intel_crtc *intel_crtc = histogram->crtc;
> +	struct intel_display *display = to_intel_display(intel_crtc);
> +	char event[] = "HISTOGRAM=1", pipe_id[21];
> +	char *histogram_event[] = { event, pipe_id, NULL };
> +	int retry;
> +
> +	snprintf(pipe_id, sizeof(pipe_id),
> +		 "PIPE=%u", intel_crtc->base.base.id);
> +
> +	/*
> +	 * TODO: PSR to be exited while reading the Histogram data
> +	 * Set DPST_CTL Bin Reg function select to TC
> +	 * Set DPST_CTL Bin Register Index to 0
> +	 */
> +	intel_de_rmw(display, DPST_CTL(intel_crtc->pipe),
> +		     DPST_CTL_BIN_REG_FUNC_SEL |
> DPST_CTL_BIN_REG_MASK, 0);
> +	for (retry = 0; retry < HISTOGRAM_BIN_READ_RETRY_COUNT; retry++)
> {
> +		if (intel_histogram_get_data(intel_crtc)) {
> +			/* Notify user for Histogram rediness */

Typo readiness

> +			if (kobject_uevent_env(&display->drm->primary-
> >kdev->kobj,
> +					       KOBJ_CHANGE, histogram_event))
> +				drm_err(display->drm,
> +					"sending HISTOGRAM event
> failed\n");

Nit: Start the debug statements with capital letter *Sending ...

> +			break;
> +		}
> +	}
> +	if (retry >= HISTOGRAM_BIN_READ_RETRY_COUNT) {
> +		drm_err(display->drm, "Histogram bin read failed with max
> retry\n");
> +		return;
> +	}
> +
> +	/* Enable histogram interrupt */
> +	intel_de_rmw(display, DPST_GUARD(intel_crtc->pipe),
> DPST_GUARD_HIST_INT_EN,
> +		     DPST_GUARD_HIST_INT_EN);
> +
> +	/* Clear histogram interrupt by setting histogram interrupt status bit*/
> +	intel_de_rmw(display, DPST_GUARD(intel_crtc->pipe),
> +		     DPST_GUARD_HIST_EVENT_STATUS, 1); }
> +
> +void intel_histogram_irq_handler(struct intel_display *display, enum
> +pipe pipe) {
> +	struct intel_crtc *intel_crtc =
> +		to_intel_crtc(drm_crtc_from_index(display->drm, pipe));
> +	struct intel_histogram *histogram = intel_crtc->histogram;
> +	struct drm_i915_private *i915 = to_i915(intel_crtc->base.dev);
> +
> +	if (!histogram->enable) {
> +		drm_err(display->drm,
> +			"spurious interrupt, histogram not enabled\n");

Ditto.

Otherwise LGTM,
Reviewed-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>

> +		return;
> +	}
> +
> +	queue_delayed_work(i915->unordered_wq,
> +			   &histogram->work, 0);
> +}
> +
>  int intel_histogram_atomic_check(struct intel_crtc *intel_crtc)  {
>  	struct intel_histogram *histogram = intel_crtc->histogram; @@ -78,7
> +156,7 @@ static int intel_histogram_enable(struct intel_crtc *intel_crtc)
>  		     DPST_GUARD_THRESHOLD_GB_MASK |
>  		     DPST_GUARD_INTERRUPT_DELAY_MASK |
> DPST_GUARD_HIST_INT_EN,
>  		     DPST_GUARD_THRESHOLD_GB(gbandthreshold) |
> -
> DPST_GUARD_INTERRUPT_DELAY(HISTOGRAM_DEFAULT_GUARDBAND_DELA
> Y) |
> +		     DPST_GUARD_INTERRUPT_DELAY(0x04) |
>  		     DPST_GUARD_HIST_INT_EN);
> 
>  	/* Clear pending interrupts has to be done on separate write */ @@ -
> 111,6 +189,7 @@ static void intel_histogram_disable(struct intel_crtc
> *intel_crtc)
>  	intel_de_rmw(display, DPST_CTL(pipe),
>  		     DPST_CTL_IE_HIST_EN, 0);
> 
> +	cancel_delayed_work(&histogram->work);
>  	histogram->enable = false;
>  }
> 
> @@ -181,6 +260,7 @@ void intel_histogram_finish(struct intel_crtc
> *intel_crtc)  {
>  	struct intel_histogram *histogram = intel_crtc->histogram;
> 
> +	cancel_delayed_work_sync(&histogram->work);
>  	kfree(histogram);
>  }
> 
> @@ -198,5 +278,8 @@ int intel_histogram_init(struct intel_crtc *intel_crtc)
>  	histogram->crtc = intel_crtc;
>  	histogram->can_enable = false;
> 
> +	INIT_DEFERRABLE_WORK(&histogram->work,
> +			     intel_histogram_handle_int_work);
> +
>  	return 0;
>  }
> diff --git a/drivers/gpu/drm/i915/display/intel_histogram.h
> b/drivers/gpu/drm/i915/display/intel_histogram.h
> index fb01ffe8903f..d7ddaab7ef54 100644
> --- a/drivers/gpu/drm/i915/display/intel_histogram.h
> +++ b/drivers/gpu/drm/i915/display/intel_histogram.h
> @@ -10,6 +10,8 @@
> 
>  struct drm_property_blob;
>  struct intel_crtc;
> +struct intel_display;
> +enum pipe;
> 
>  #define HISTOGRAM_BIN_COUNT                    32
>  #define HISTOGRAM_IET_LENGTH                   33
> @@ -28,6 +30,7 @@ enum intel_global_hist_lut {  };
> 
>  int intel_histogram_atomic_check(struct intel_crtc *intel_crtc);
> +void intel_histogram_irq_handler(struct intel_display *display, enum
> +pipe pipe);
>  int intel_histogram_update(struct intel_crtc *intel_crtc, bool enable);  int
> intel_histogram_set_iet_lut(struct intel_crtc *intel_crtc,
>  				struct drm_property_blob *blob);
> diff --git a/drivers/gpu/drm/i915/i915_reg.h
> b/drivers/gpu/drm/i915/i915_reg.h index f48b5c809cec..836602e47511
> 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1605,7 +1605,7 @@
>  #define   PIPE_HOTPLUG_INTERRUPT_ENABLE		(1UL << 26)
>  #define   PIPE_VSYNC_INTERRUPT_ENABLE		(1UL << 25)
>  #define   PIPE_DISPLAY_LINE_COMPARE_ENABLE	(1UL << 24)
> -#define   PIPE_DPST_EVENT_ENABLE		(1UL << 23)
> +#define   PIPE_HISTOGRAM_EVENT_ENABLE		(1UL << 23)
>  #define   SPRITE0_FLIP_DONE_INT_EN_VLV		(1UL << 22)
>  #define   PIPE_LEGACY_BLC_EVENT_ENABLE		(1UL << 22)
>  #define   PIPE_ODD_FIELD_INTERRUPT_ENABLE	(1UL << 21)
> @@ -1628,7 +1628,7 @@
>  #define   PIPE_HOTPLUG_INTERRUPT_STATUS		(1UL << 10)
>  #define   PIPE_VSYNC_INTERRUPT_STATUS		(1UL << 9)
>  #define   PIPE_DISPLAY_LINE_COMPARE_STATUS	(1UL << 8)
> -#define   PIPE_DPST_EVENT_STATUS		(1UL << 7)
> +#define   PIPE_HISTOGRAM_EVENT_STATUS		(1UL << 7)
>  #define   PIPE_A_PSR_STATUS_VLV			(1UL << 6)
>  #define   PIPE_LEGACY_BLC_EVENT_STATUS		(1UL << 6)
>  #define   PIPE_ODD_FIELD_INTERRUPT_STATUS	(1UL << 5)
> @@ -2470,6 +2470,7 @@
>  #define  GEN12_DSB_1_INT		REG_BIT(14) /* tgl+ */
>  #define  GEN12_DSB_0_INT		REG_BIT(13) /* tgl+ */
>  #define  GEN12_DSB_INT(dsb_id)		REG_BIT(13 + (dsb_id))
> +#define  GEN9_PIPE_HISTOGRAM_EVENT	REG_BIT(12) /* skl+ */
>  #define  GEN9_PIPE_CURSOR_FAULT		REG_BIT(11) /* skl+ */
>  #define  GEN9_PIPE_PLANE4_FAULT		REG_BIT(10) /* skl+ */
>  #define  GEN8_PIPE_CURSOR_FAULT		REG_BIT(10) /* bdw */
> --
> 2.25.1





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