On Thu, 2025-01-16 at 19:47 +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrj...@linux.intel.com>
>
> Hook up the display fault irq handlers for VLV/CHV.
>
> Unfortunately the actual hardware doesn't agree with the
> spec on how DPINVGTT should behave. The docs claim that
> the status bits can be cleared by writing '1' to them,
> but in reality there doesn't seem to be any way to clear
> them. So we must disable and ignore any fault we've already
> seen in the past. The entire register does reset when
> the display power well goes down, so we can just always
> re-enable all the bits in irq postinstall without having
> to track the state beyond that.
>
> Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> .../gpu/drm/i915/display/intel_display_irq.c | 131 +++++++++++++++++-
> .../gpu/drm/i915/display/intel_display_irq.h | 3 +
> drivers/gpu/drm/i915/i915_irq.c | 14 ++
> drivers/gpu/drm/i915/i915_reg.h | 10 ++
> drivers/gpu/drm/xe/display/ext/i915_irq.c | 23 +++
> 5 files changed, 180 insertions(+), 1 deletion(-)
Reviewed-by: Vinod Govindapillai <vinod.govindapil...@intel.com>
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c
> b/drivers/gpu/drm/i915/display/intel_display_irq.c
> index c80183b0acaf..071b7fdf7da3 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_irq.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_irq.c
> @@ -1729,6 +1729,115 @@ void bdw_disable_vblank(struct drm_crtc *_crtc)
> schedule_work(&display->irq.vblank_dc_work);
> }
>
> +static u32 vlv_dpinvgtt_pipe_fault_mask(enum pipe pipe)
> +{
> + switch (pipe) {
> + case PIPE_A:
> + return SPRITEB_INVALID_GTT_STATUS |
> + SPRITEA_INVALID_GTT_STATUS |
> + PLANEA_INVALID_GTT_STATUS |
> + CURSORA_INVALID_GTT_STATUS;
> + case PIPE_B:
> + return SPRITED_INVALID_GTT_STATUS |
> + SPRITEC_INVALID_GTT_STATUS |
> + PLANEB_INVALID_GTT_STATUS |
> + CURSORB_INVALID_GTT_STATUS;
> + case PIPE_C:
> + return SPRITEF_INVALID_GTT_STATUS |
> + SPRITEE_INVALID_GTT_STATUS |
> + PLANEC_INVALID_GTT_STATUS |
> + CURSORC_INVALID_GTT_STATUS;
> + default:
> + return 0;
> + }
> +}
> +
> +static const struct pipe_fault_handler vlv_pipe_fault_handlers[] = {
> + { .fault = SPRITEB_INVALID_GTT_STATUS, .handle = handle_plane_fault,
> .plane_id =
> PLANE_SPRITE1, },
> + { .fault = SPRITEA_INVALID_GTT_STATUS, .handle = handle_plane_fault,
> .plane_id =
> PLANE_SPRITE0, },
> + { .fault = PLANEA_INVALID_GTT_STATUS, .handle = handle_plane_fault,
> .plane_id =
> PLANE_PRIMARY, },
> + { .fault = CURSORA_INVALID_GTT_STATUS, .handle = handle_plane_fault,
> .plane_id =
> PLANE_CURSOR, },
> + { .fault = SPRITED_INVALID_GTT_STATUS, .handle = handle_plane_fault,
> .plane_id =
> PLANE_SPRITE1, },
> + { .fault = SPRITEC_INVALID_GTT_STATUS, .handle = handle_plane_fault,
> .plane_id =
> PLANE_SPRITE0, },
> + { .fault = PLANEB_INVALID_GTT_STATUS, .handle = handle_plane_fault,
> .plane_id =
> PLANE_PRIMARY, },
> + { .fault = CURSORB_INVALID_GTT_STATUS, .handle = handle_plane_fault,
> .plane_id =
> PLANE_CURSOR, },
> + { .fault = SPRITEF_INVALID_GTT_STATUS, .handle = handle_plane_fault,
> .plane_id =
> PLANE_SPRITE1, },
> + { .fault = SPRITEE_INVALID_GTT_STATUS, .handle = handle_plane_fault,
> .plane_id =
> PLANE_SPRITE0, },
> + { .fault = PLANEC_INVALID_GTT_STATUS, .handle = handle_plane_fault,
> .plane_id =
> PLANE_PRIMARY, },
> + { .fault = CURSORC_INVALID_GTT_STATUS, .handle = handle_plane_fault,
> .plane_id =
> PLANE_CURSOR, },
> + {}
> +};
> +
> +static void vlv_page_table_error_irq_ack(struct drm_i915_private *i915, u32
> *dpinvgtt)
> +{
> + u32 status, enable, tmp;
> +
> + tmp = intel_uncore_read(&i915->uncore, DPINVGTT);
> +
> + enable = tmp >> 16;
> + status = tmp & 0xffff;
> +
> + /*
> + * Despite what the docs claim, the status bits seem to get
> + * stuck permanently (similar the old PGTBL_ER register), so
> + * we have to disable and ignore them once set. They do get
> + * reset if the display power well goes down, so no need to
> + * track the enable mask explicitly.
> + */
> + *dpinvgtt = status & enable;
> + enable &= ~status;
> +
> + /* customary ack+disable then re-enable to guarantee an edge */
> + intel_uncore_write(&i915->uncore, DPINVGTT, status);
> + intel_uncore_write(&i915->uncore, DPINVGTT, enable << 16);
> +}
> +
> +static void vlv_page_table_error_irq_handler(struct drm_i915_private *i915,
> u32 dpinvgtt)
> +{
> + struct intel_display *display = &i915->display;
> + enum pipe pipe;
> +
> + for_each_pipe(i915, pipe) {
> + u32 fault_errors;
> +
> + fault_errors = dpinvgtt & vlv_dpinvgtt_pipe_fault_mask(pipe);
> + if (fault_errors)
> + intel_pipe_fault_irq_handler(display,
> vlv_pipe_fault_handlers,
> + pipe, fault_errors);
> + }
> +}
> +
> +void vlv_display_error_irq_ack(struct drm_i915_private *dev_priv,
> + u32 *eir, u32 *dpinvgtt)
> +{
> + u32 emr;
> +
> + *eir = intel_uncore_read(&dev_priv->uncore, VLV_EIR);
> +
> + if (*eir & VLV_ERROR_PAGE_TABLE)
> + vlv_page_table_error_irq_ack(dev_priv, dpinvgtt);
> +
> + intel_uncore_write(&dev_priv->uncore, VLV_EIR, *eir);
> +
> + /*
> + * Toggle all EMR bits to make sure we get an edge
> + * in the ISR master error bit if we don't clear
> + * all the EIR bits.
> + */
> + emr = intel_uncore_read(&dev_priv->uncore, VLV_EMR);
> + intel_uncore_write(&dev_priv->uncore, VLV_EMR, 0xffffffff);
> + intel_uncore_write(&dev_priv->uncore, VLV_EMR, emr);
> +}
> +
> +void vlv_display_error_irq_handler(struct drm_i915_private *dev_priv,
> + u32 eir, u32 dpinvgtt)
> +{
> + drm_dbg(&dev_priv->drm, "Master Error, EIR 0x%08x\n", eir);
> +
> + if (eir & VLV_ERROR_PAGE_TABLE)
> + vlv_page_table_error_irq_handler(dev_priv, dpinvgtt);
> +}
> +
> static void _vlv_display_irq_reset(struct drm_i915_private *dev_priv)
> {
> struct intel_uncore *uncore = &dev_priv->uncore;
> @@ -1738,6 +1847,8 @@ static void _vlv_display_irq_reset(struct
> drm_i915_private *dev_priv)
> else
> intel_uncore_write(uncore, DPINVGTT, DPINVGTT_STATUS_MASK_VLV);
>
> + gen2_error_reset(&dev_priv->uncore, VLV_ERROR_REGS);
> +
> i915_hotplug_interrupt_update_locked(dev_priv, 0xffffffff, 0);
> intel_uncore_rmw(uncore, PORT_HOTPLUG_STAT(dev_priv), 0, 0);
>
> @@ -1764,6 +1875,12 @@ void i9xx_display_irq_reset(struct drm_i915_private
> *i915)
> i9xx_pipestat_irq_reset(i915);
> }
>
> +static u32 vlv_error_mask(void)
> +{
> + /* TODO enable other errors too? */
> + return VLV_ERROR_PAGE_TABLE;
> +}
> +
> void vlv_display_irq_postinstall(struct drm_i915_private *dev_priv)
> {
> struct intel_uncore *uncore = &dev_priv->uncore;
> @@ -1775,6 +1892,17 @@ void vlv_display_irq_postinstall(struct
> drm_i915_private *dev_priv)
> if (!dev_priv->display.irq.vlv_display_irqs_enabled)
> return;
>
> + if (IS_CHERRYVIEW(dev_priv))
> + intel_uncore_write(uncore, DPINVGTT,
> + DPINVGTT_STATUS_MASK_CHV |
> + DPINVGTT_EN_MASK_CHV);
> + else
> + intel_uncore_write(uncore, DPINVGTT,
> + DPINVGTT_STATUS_MASK_VLV |
> + DPINVGTT_EN_MASK_VLV);
> +
> + gen2_error_init(&dev_priv->uncore, VLV_ERROR_REGS, ~vlv_error_mask());
> +
> pipestat_mask = PIPE_CRC_DONE_INTERRUPT_STATUS;
>
> i915_enable_pipestat(dev_priv, PIPE_A, PIPE_GMBUS_INTERRUPT_STATUS);
> @@ -1785,7 +1913,8 @@ void vlv_display_irq_postinstall(struct
> drm_i915_private *dev_priv)
> I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
> I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
> I915_LPE_PIPE_A_INTERRUPT |
> - I915_LPE_PIPE_B_INTERRUPT;
> + I915_LPE_PIPE_B_INTERRUPT |
> + I915_MASTER_ERROR_INTERRUPT;
>
> if (IS_CHERRYVIEW(dev_priv))
> enable_mask |= I915_DISPLAY_PIPE_C_EVENT_INTERRUPT |
> diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.h
> b/drivers/gpu/drm/i915/display/intel_display_irq.h
> index b077712b7be1..c3651a4750e4 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_irq.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_irq.h
> @@ -75,6 +75,9 @@ void i915_pipestat_irq_handler(struct drm_i915_private
> *i915, u32 iir, u32 pipe_
> void i965_pipestat_irq_handler(struct drm_i915_private *i915, u32 iir, u32
> pipe_stats[I915_MAX_PIPES]);
> void valleyview_pipestat_irq_handler(struct drm_i915_private *i915, u32
> pipe_stats[I915_MAX_PIPES]);
>
> +void vlv_display_error_irq_ack(struct drm_i915_private *i915, u32 *eir, u32
> *dpinvgtt);
> +void vlv_display_error_irq_handler(struct drm_i915_private *i915, u32 eir,
> u32 dpinvgtt);
> +
> void intel_display_irq_init(struct drm_i915_private *i915);
>
> void i915gm_irq_cstate_wa(struct drm_i915_private *i915, bool enable);
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index bd5956262c6d..e582a33fac23 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -241,6 +241,7 @@ static irqreturn_t valleyview_irq_handler(int irq, void
> *arg)
>
> do {
> u32 iir, gt_iir, pm_iir;
> + u32 eir = 0, dpinvgtt = 0;
> u32 pipe_stats[I915_MAX_PIPES] = {};
> u32 hotplug_status = 0;
> u32 ier = 0;
> @@ -278,6 +279,9 @@ static irqreturn_t valleyview_irq_handler(int irq, void
> *arg)
> if (iir & I915_DISPLAY_PORT_INTERRUPT)
> hotplug_status = i9xx_hpd_irq_ack(dev_priv);
>
> + if (iir & I915_MASTER_ERROR_INTERRUPT)
> + vlv_display_error_irq_ack(dev_priv, &eir, &dpinvgtt);
> +
> /* Call regardless, as some status bits might not be
> * signalled in IIR */
> i9xx_pipestat_irq_ack(dev_priv, iir, pipe_stats);
> @@ -304,6 +308,9 @@ static irqreturn_t valleyview_irq_handler(int irq, void
> *arg)
> if (hotplug_status)
> i9xx_hpd_irq_handler(dev_priv, hotplug_status);
>
> + if (iir & I915_MASTER_ERROR_INTERRUPT)
> + vlv_display_error_irq_handler(dev_priv, eir, dpinvgtt);
> +
> valleyview_pipestat_irq_handler(dev_priv, pipe_stats);
> } while (0);
>
> @@ -328,6 +335,7 @@ static irqreturn_t cherryview_irq_handler(int irq, void
> *arg)
>
> do {
> u32 master_ctl, iir;
> + u32 eir = 0, dpinvgtt = 0;
> u32 pipe_stats[I915_MAX_PIPES] = {};
> u32 hotplug_status = 0;
> u32 ier = 0;
> @@ -361,6 +369,9 @@ static irqreturn_t cherryview_irq_handler(int irq, void
> *arg)
> if (iir & I915_DISPLAY_PORT_INTERRUPT)
> hotplug_status = i9xx_hpd_irq_ack(dev_priv);
>
> + if (iir & I915_MASTER_ERROR_INTERRUPT)
> + vlv_display_error_irq_ack(dev_priv, &eir, &dpinvgtt);
> +
> /* Call regardless, as some status bits might not be
> * signalled in IIR */
> i9xx_pipestat_irq_ack(dev_priv, iir, pipe_stats);
> @@ -383,6 +394,9 @@ static irqreturn_t cherryview_irq_handler(int irq, void
> *arg)
> if (hotplug_status)
> i9xx_hpd_irq_handler(dev_priv, hotplug_status);
>
> + if (iir & I915_MASTER_ERROR_INTERRUPT)
> + vlv_display_error_irq_handler(dev_priv, eir, dpinvgtt);
> +
> valleyview_pipestat_irq_handler(dev_priv, pipe_stats);
> } while (0);
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index aed109adfedf..de67547e738c 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -475,6 +475,16 @@
>
> #define GEN2_ERROR_REGS I915_ERROR_REGS(EMR, EIR)
>
> +#define VLV_EIR _MMIO(VLV_DISPLAY_BASE + 0x20b0)
> +#define VLV_EMR _MMIO(VLV_DISPLAY_BASE + 0x20b4)
> +#define VLV_ESR _MMIO(VLV_DISPLAY_BASE + 0x20b8)
> +#define VLV_ERROR_GUNIT_TLB_DATA (1 << 6)
> +#define VLV_ERROR_GUNIT_TLB_PTE (1 << 5)
> +#define VLV_ERROR_PAGE_TABLE (1 << 4)
> +#define VLV_ERROR_CLAIM (1 << 0)
> +
> +#define VLV_ERROR_REGS I915_ERROR_REGS(VLV_EMR, VLV_EIR)
> +
> #define INSTPM _MMIO(0x20c0)
> #define INSTPM_SELF_EN (1 << 12) /* 915GM only */
> #define INSTPM_AGPBUSY_INT_EN (1 << 11) /* gen3: when disabled, pending
> interrupts
> diff --git a/drivers/gpu/drm/xe/display/ext/i915_irq.c
> b/drivers/gpu/drm/xe/display/ext/i915_irq.c
> index ac4cda2d81c7..3c6bca66ddab 100644
> --- a/drivers/gpu/drm/xe/display/ext/i915_irq.c
> +++ b/drivers/gpu/drm/xe/display/ext/i915_irq.c
> @@ -51,6 +51,29 @@ void gen2_irq_init(struct intel_uncore *uncore, struct
> i915_irq_regs regs,
> intel_uncore_posting_read(uncore, regs.imr);
> }
>
> +void gen2_error_reset(struct intel_uncore *uncore, struct i915_error_regs
> regs)
> +{
> + intel_uncore_write(uncore, regs.emr, 0xffffffff);
> + intel_uncore_posting_read(uncore, regs.emr);
> +
> + intel_uncore_write(uncore, regs.eir, 0xffffffff);
> + intel_uncore_posting_read(uncore, regs.eir);
> + intel_uncore_write(uncore, regs.eir, 0xffffffff);
> + intel_uncore_posting_read(uncore, regs.eir);
> +}
> +
> +void gen2_error_init(struct intel_uncore *uncore, struct i915_error_regs
> regs,
> + u32 emr_val)
> +{
> + intel_uncore_write(uncore, regs.eir, 0xffffffff);
> + intel_uncore_posting_read(uncore, regs.eir);
> + intel_uncore_write(uncore, regs.eir, 0xffffffff);
> + intel_uncore_posting_read(uncore, regs.eir);
> +
> + intel_uncore_write(uncore, regs.emr, emr_val);
> + intel_uncore_posting_read(uncore, regs.emr);
> +}
> +
> bool intel_irqs_enabled(struct xe_device *xe)
> {
> return atomic_read(&xe->irq.enabled);
