| Message ID | 20241028120829.78735-1-vinod.govindapillai@intel.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | drm/i915: Implement Dbuf overlap detection feature starting from LNL | expand |
On Mon, 28 Oct 2024, Vinod Govindapillai <vinod.govindapillai@intel.com> wrote: > From: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> > > From LNL onwards there is a new hardware feature, which > allows to detect if the driver wrongly allocated DBuf > entries and they happen to overlap. If enabled this will > cause a specific interrupt to occur. > We now handle it in the driver, by writing correspondent > error message to kernel log. > > v2: Initialize dbuf overlap flag in runtime_defaults (Jani Nikula) > > v3: Unmask the overlap detection interrupt (Uma) > > Bspec: 69450 > Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> > Signed-off-by: Vinod Govindapillai <vinod.govindapillai@intel.com> > --- > drivers/gpu/drm/i915/display/intel_display_device.c | 5 +++++ > drivers/gpu/drm/i915/display/intel_display_device.h | 2 ++ > drivers/gpu/drm/i915/display/intel_display_irq.c | 10 ++++++++++ > drivers/gpu/drm/i915/i915_reg.h | 2 ++ > 4 files changed, 19 insertions(+) > > diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c b/drivers/gpu/drm/i915/display/intel_display_device.c > index aa22189e3853..0ac9a35e5f7b 100644 > --- a/drivers/gpu/drm/i915/display/intel_display_device.c > +++ b/drivers/gpu/drm/i915/display/intel_display_device.c > @@ -1227,6 +1227,7 @@ static const struct intel_display_device_info xe2_lpd_display = { > .__runtime_defaults.fbc_mask = > BIT(INTEL_FBC_A) | BIT(INTEL_FBC_B) | > BIT(INTEL_FBC_C) | BIT(INTEL_FBC_D), > + .__runtime_defaults.has_dbuf_overlap_detection = true, > }; > > static const struct intel_display_device_info xe2_hpd_display = { > @@ -1668,6 +1669,10 @@ static void __intel_display_device_info_runtime_init(struct drm_i915_private *i9 > if (IS_DISPLAY_VER(i915, 10, 12) && > (dfsm & GLK_DFSM_DISPLAY_DSC_DISABLE)) > display_runtime->has_dsc = 0; > + > + if (DISPLAY_VER(i915) >= 20 && Always use display over i915 when possible: DISPLAY_VER(display) > + (dfsm & XE2LPD_DFSM_DBUF_OVERLAP_DISABLE)) > + display_runtime->has_dbuf_overlap_detection = false; > } > > if (DISPLAY_VER(i915) >= 20) { > diff --git a/drivers/gpu/drm/i915/display/intel_display_device.h b/drivers/gpu/drm/i915/display/intel_display_device.h > index 071a36b51f79..6bf5672d874d 100644 > --- a/drivers/gpu/drm/i915/display/intel_display_device.h > +++ b/drivers/gpu/drm/i915/display/intel_display_device.h > @@ -125,6 +125,7 @@ enum intel_display_subplatform { > #define HAS_CDCLK_SQUASH(i915) (DISPLAY_INFO(i915)->has_cdclk_squash) > #define HAS_CUR_FBC(i915) (!HAS_GMCH(i915) && IS_DISPLAY_VER(i915, 7, 13)) > #define HAS_D12_PLANE_MINIMIZATION(i915) (IS_ROCKETLAKE(i915) || IS_ALDERLAKE_S(i915)) > +#define HAS_DBUF_OVERLAP_DETECTION(__i915) (DISPLAY_RUNTIME_INFO(__i915)->has_dbuf_overlap_detection) > #define HAS_DDI(i915) (DISPLAY_INFO(i915)->has_ddi) > #define HAS_DISPLAY(i915) (DISPLAY_RUNTIME_INFO(i915)->pipe_mask != 0) > #define HAS_DMC(i915) (DISPLAY_RUNTIME_INFO(i915)->has_dmc) > @@ -232,6 +233,7 @@ struct intel_display_runtime_info { > bool has_hdcp; > bool has_dmc; > bool has_dsc; > + bool has_dbuf_overlap_detection; > }; > > struct intel_display_device_info { > diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c b/drivers/gpu/drm/i915/display/intel_display_irq.c > index a4f42ed3f21a..3d3c0c1fd184 100644 > --- a/drivers/gpu/drm/i915/display/intel_display_irq.c > +++ b/drivers/gpu/drm/i915/display/intel_display_irq.c > @@ -902,6 +902,13 @@ gen8_de_misc_irq_handler(struct drm_i915_private *dev_priv, u32 iir) > struct intel_display *display = &dev_priv->display; > bool found = false; > > + if (HAS_DBUF_OVERLAP_DETECTION(dev_priv)) { HAS_DBUF_OVERLAP_DETECTION(display) > + if (iir & XE2LPD_DBUF_OVERLAP_DETECTED) { > + drm_warn(&dev_priv->drm, "DBuf overlap detected\n"); drm_warn(display->drm, ...) So the end result is that we get a warning, and that's it? > + found = true; > + } > + } > + > if (DISPLAY_VER(dev_priv) >= 14) { > if (iir & (XELPDP_PMDEMAND_RSP | > XELPDP_PMDEMAND_RSPTOUT_ERR)) { > @@ -1789,6 +1796,9 @@ void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv) > de_port_masked |= DSI0_TE | DSI1_TE; > } > > + if (HAS_DBUF_OVERLAP_DETECTION(dev_priv)) HAS_DBUF_OVERLAP_DETECTION(display) > + de_misc_masked |= XE2LPD_DBUF_OVERLAP_DETECTED; > + > if (HAS_DSB(dev_priv)) > de_pipe_masked |= GEN12_DSB_INT(INTEL_DSB_0) | > GEN12_DSB_INT(INTEL_DSB_1) | > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > index 405f409e9761..327d1aa3f211 100644 > --- a/drivers/gpu/drm/i915/i915_reg.h > +++ b/drivers/gpu/drm/i915/i915_reg.h > @@ -2589,6 +2589,7 @@ > #define GEN8_DE_MISC_GSE REG_BIT(27) > #define GEN8_DE_EDP_PSR REG_BIT(19) > #define XELPDP_PMDEMAND_RSP REG_BIT(3) > +#define XE2LPD_DBUF_OVERLAP_DETECTED REG_BIT(1) > > #define GEN8_DE_MISC_IRQ_REGS I915_IRQ_REGS(GEN8_DE_MISC_IMR, \ > GEN8_DE_MISC_IER, \ > @@ -2894,6 +2895,7 @@ > #define SKL_DFSM_PIPE_C_DISABLE (1 << 28) > #define TGL_DFSM_PIPE_D_DISABLE (1 << 22) > #define GLK_DFSM_DISPLAY_DSC_DISABLE (1 << 7) > +#define XE2LPD_DFSM_DBUF_OVERLAP_DISABLE (1 << 3) > > #define XE2LPD_DE_CAP _MMIO(0x41100) > #define XE2LPD_DE_CAP_3DLUT_MASK REG_GENMASK(31, 30)
On Mon, 2024-10-28 at 14:43 +0200, Jani Nikula wrote: > On Mon, 28 Oct 2024, Vinod Govindapillai <vinod.govindapillai@intel.com> wrote: > > From: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> > > > > From LNL onwards there is a new hardware feature, which > > allows to detect if the driver wrongly allocated DBuf > > entries and they happen to overlap. If enabled this will > > cause a specific interrupt to occur. > > We now handle it in the driver, by writing correspondent > > error message to kernel log. > > > > v2: Initialize dbuf overlap flag in runtime_defaults (Jani Nikula) > > > > v3: Unmask the overlap detection interrupt (Uma) > > > > Bspec: 69450 > > Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> > > Signed-off-by: Vinod Govindapillai <vinod.govindapillai@intel.com> > > --- > > drivers/gpu/drm/i915/display/intel_display_device.c | 5 +++++ > > drivers/gpu/drm/i915/display/intel_display_device.h | 2 ++ > > drivers/gpu/drm/i915/display/intel_display_irq.c | 10 ++++++++++ > > drivers/gpu/drm/i915/i915_reg.h | 2 ++ > > 4 files changed, 19 insertions(+) > > > > diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c > > b/drivers/gpu/drm/i915/display/intel_display_device.c > > index aa22189e3853..0ac9a35e5f7b 100644 > > --- a/drivers/gpu/drm/i915/display/intel_display_device.c > > +++ b/drivers/gpu/drm/i915/display/intel_display_device.c > > @@ -1227,6 +1227,7 @@ static const struct intel_display_device_info xe2_lpd_display = { > > .__runtime_defaults.fbc_mask = > > BIT(INTEL_FBC_A) | BIT(INTEL_FBC_B) | > > BIT(INTEL_FBC_C) | BIT(INTEL_FBC_D), > > + .__runtime_defaults.has_dbuf_overlap_detection = true, > > }; > > > > static const struct intel_display_device_info xe2_hpd_display = { > > @@ -1668,6 +1669,10 @@ static void __intel_display_device_info_runtime_init(struct > > drm_i915_private *i9 > > if (IS_DISPLAY_VER(i915, 10, 12) && > > (dfsm & GLK_DFSM_DISPLAY_DSC_DISABLE)) > > display_runtime->has_dsc = 0; > > + > > + if (DISPLAY_VER(i915) >= 20 && > > Always use display over i915 when possible: > > DISPLAY_VER(display) > > > + (dfsm & XE2LPD_DFSM_DBUF_OVERLAP_DISABLE)) > > + display_runtime->has_dbuf_overlap_detection = false; > > } > > > > if (DISPLAY_VER(i915) >= 20) { > > diff --git a/drivers/gpu/drm/i915/display/intel_display_device.h > > b/drivers/gpu/drm/i915/display/intel_display_device.h > > index 071a36b51f79..6bf5672d874d 100644 > > --- a/drivers/gpu/drm/i915/display/intel_display_device.h > > +++ b/drivers/gpu/drm/i915/display/intel_display_device.h > > @@ -125,6 +125,7 @@ enum intel_display_subplatform { > > #define HAS_CDCLK_SQUASH(i915) (DISPLAY_INFO(i915)->has_cdclk_squash) > > #define HAS_CUR_FBC(i915) (!HAS_GMCH(i915) && IS_DISPLAY_VER(i915, 7, 13)) > > #define HAS_D12_PLANE_MINIMIZATION(i915) (IS_ROCKETLAKE(i915) || IS_ALDERLAKE_S(i915)) > > +#define HAS_DBUF_OVERLAP_DETECTION(__i915) (DISPLAY_RUNTIME_INFO(__i915)- > > >has_dbuf_overlap_detection) > > #define HAS_DDI(i915) (DISPLAY_INFO(i915)->has_ddi) > > #define HAS_DISPLAY(i915) (DISPLAY_RUNTIME_INFO(i915)->pipe_mask != 0) > > #define HAS_DMC(i915) (DISPLAY_RUNTIME_INFO(i915)->has_dmc) > > @@ -232,6 +233,7 @@ struct intel_display_runtime_info { > > bool has_hdcp; > > bool has_dmc; > > bool has_dsc; > > + bool has_dbuf_overlap_detection; > > }; > > > > struct intel_display_device_info { > > diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c > > b/drivers/gpu/drm/i915/display/intel_display_irq.c > > index a4f42ed3f21a..3d3c0c1fd184 100644 > > --- a/drivers/gpu/drm/i915/display/intel_display_irq.c > > +++ b/drivers/gpu/drm/i915/display/intel_display_irq.c > > @@ -902,6 +902,13 @@ gen8_de_misc_irq_handler(struct drm_i915_private *dev_priv, u32 iir) > > struct intel_display *display = &dev_priv->display; > > bool found = false; > > > > + if (HAS_DBUF_OVERLAP_DETECTION(dev_priv)) { > > HAS_DBUF_OVERLAP_DETECTION(display) > > > + if (iir & XE2LPD_DBUF_OVERLAP_DETECTED) { > > + drm_warn(&dev_priv->drm, "DBuf overlap detected\n"); > > drm_warn(display->drm, ...) > > So the end result is that we get a warning, and that's it? Yes. Just print the warning. Thats what HAS says. With this feature support, one WA can be avoided related FBC + PAVP. But we dont have that at the moment. I will update the patch with "display". Thanks Vinod > > > + found = true; > > + } > > + } > > + > > if (DISPLAY_VER(dev_priv) >= 14) { > > if (iir & (XELPDP_PMDEMAND_RSP | > > XELPDP_PMDEMAND_RSPTOUT_ERR)) { > > @@ -1789,6 +1796,9 @@ void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv) > > de_port_masked |= DSI0_TE | DSI1_TE; > > } > > > > + if (HAS_DBUF_OVERLAP_DETECTION(dev_priv)) > > HAS_DBUF_OVERLAP_DETECTION(display) > > > + de_misc_masked |= XE2LPD_DBUF_OVERLAP_DETECTED; > > + > > if (HAS_DSB(dev_priv)) > > de_pipe_masked |= GEN12_DSB_INT(INTEL_DSB_0) | > > GEN12_DSB_INT(INTEL_DSB_1) | > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > > index 405f409e9761..327d1aa3f211 100644 > > --- a/drivers/gpu/drm/i915/i915_reg.h > > +++ b/drivers/gpu/drm/i915/i915_reg.h > > @@ -2589,6 +2589,7 @@ > > #define GEN8_DE_MISC_GSE REG_BIT(27) > > #define GEN8_DE_EDP_PSR REG_BIT(19) > > #define XELPDP_PMDEMAND_RSP REG_BIT(3) > > +#define XE2LPD_DBUF_OVERLAP_DETECTED REG_BIT(1) > > > > #define GEN8_DE_MISC_IRQ_REGS I915_IRQ_REGS(GEN8_DE_MISC_IMR, \ > > GEN8_DE_MISC_IER, \ > > @@ -2894,6 +2895,7 @@ > > #define SKL_DFSM_PIPE_C_DISABLE (1 << 28) > > #define TGL_DFSM_PIPE_D_DISABLE (1 << 22) > > #define GLK_DFSM_DISPLAY_DSC_DISABLE (1 << 7) > > +#define XE2LPD_DFSM_DBUF_OVERLAP_DISABLE (1 << 3) > > > > #define XE2LPD_DE_CAP _MMIO(0x41100) > > #define XE2LPD_DE_CAP_3DLUT_MASK REG_GENMASK(31, 30) >
diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c b/drivers/gpu/drm/i915/display/intel_display_device.c index aa22189e3853..0ac9a35e5f7b 100644 --- a/drivers/gpu/drm/i915/display/intel_display_device.c +++ b/drivers/gpu/drm/i915/display/intel_display_device.c @@ -1227,6 +1227,7 @@ static const struct intel_display_device_info xe2_lpd_display = { .__runtime_defaults.fbc_mask = BIT(INTEL_FBC_A) | BIT(INTEL_FBC_B) | BIT(INTEL_FBC_C) | BIT(INTEL_FBC_D), + .__runtime_defaults.has_dbuf_overlap_detection = true, }; static const struct intel_display_device_info xe2_hpd_display = { @@ -1668,6 +1669,10 @@ static void __intel_display_device_info_runtime_init(struct drm_i915_private *i9 if (IS_DISPLAY_VER(i915, 10, 12) && (dfsm & GLK_DFSM_DISPLAY_DSC_DISABLE)) display_runtime->has_dsc = 0; + + if (DISPLAY_VER(i915) >= 20 && + (dfsm & XE2LPD_DFSM_DBUF_OVERLAP_DISABLE)) + display_runtime->has_dbuf_overlap_detection = false; } if (DISPLAY_VER(i915) >= 20) { diff --git a/drivers/gpu/drm/i915/display/intel_display_device.h b/drivers/gpu/drm/i915/display/intel_display_device.h index 071a36b51f79..6bf5672d874d 100644 --- a/drivers/gpu/drm/i915/display/intel_display_device.h +++ b/drivers/gpu/drm/i915/display/intel_display_device.h @@ -125,6 +125,7 @@ enum intel_display_subplatform { #define HAS_CDCLK_SQUASH(i915) (DISPLAY_INFO(i915)->has_cdclk_squash) #define HAS_CUR_FBC(i915) (!HAS_GMCH(i915) && IS_DISPLAY_VER(i915, 7, 13)) #define HAS_D12_PLANE_MINIMIZATION(i915) (IS_ROCKETLAKE(i915) || IS_ALDERLAKE_S(i915)) +#define HAS_DBUF_OVERLAP_DETECTION(__i915) (DISPLAY_RUNTIME_INFO(__i915)->has_dbuf_overlap_detection) #define HAS_DDI(i915) (DISPLAY_INFO(i915)->has_ddi) #define HAS_DISPLAY(i915) (DISPLAY_RUNTIME_INFO(i915)->pipe_mask != 0) #define HAS_DMC(i915) (DISPLAY_RUNTIME_INFO(i915)->has_dmc) @@ -232,6 +233,7 @@ struct intel_display_runtime_info { bool has_hdcp; bool has_dmc; bool has_dsc; + bool has_dbuf_overlap_detection; }; struct intel_display_device_info { diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c b/drivers/gpu/drm/i915/display/intel_display_irq.c index a4f42ed3f21a..3d3c0c1fd184 100644 --- a/drivers/gpu/drm/i915/display/intel_display_irq.c +++ b/drivers/gpu/drm/i915/display/intel_display_irq.c @@ -902,6 +902,13 @@ gen8_de_misc_irq_handler(struct drm_i915_private *dev_priv, u32 iir) struct intel_display *display = &dev_priv->display; bool found = false; + if (HAS_DBUF_OVERLAP_DETECTION(dev_priv)) { + if (iir & XE2LPD_DBUF_OVERLAP_DETECTED) { + drm_warn(&dev_priv->drm, "DBuf overlap detected\n"); + found = true; + } + } + if (DISPLAY_VER(dev_priv) >= 14) { if (iir & (XELPDP_PMDEMAND_RSP | XELPDP_PMDEMAND_RSPTOUT_ERR)) { @@ -1789,6 +1796,9 @@ void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv) de_port_masked |= DSI0_TE | DSI1_TE; } + if (HAS_DBUF_OVERLAP_DETECTION(dev_priv)) + de_misc_masked |= XE2LPD_DBUF_OVERLAP_DETECTED; + if (HAS_DSB(dev_priv)) de_pipe_masked |= GEN12_DSB_INT(INTEL_DSB_0) | GEN12_DSB_INT(INTEL_DSB_1) | diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 405f409e9761..327d1aa3f211 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -2589,6 +2589,7 @@ #define GEN8_DE_MISC_GSE REG_BIT(27) #define GEN8_DE_EDP_PSR REG_BIT(19) #define XELPDP_PMDEMAND_RSP REG_BIT(3) +#define XE2LPD_DBUF_OVERLAP_DETECTED REG_BIT(1) #define GEN8_DE_MISC_IRQ_REGS I915_IRQ_REGS(GEN8_DE_MISC_IMR, \ GEN8_DE_MISC_IER, \ @@ -2894,6 +2895,7 @@ #define SKL_DFSM_PIPE_C_DISABLE (1 << 28) #define TGL_DFSM_PIPE_D_DISABLE (1 << 22) #define GLK_DFSM_DISPLAY_DSC_DISABLE (1 << 7) +#define XE2LPD_DFSM_DBUF_OVERLAP_DISABLE (1 << 3) #define XE2LPD_DE_CAP _MMIO(0x41100) #define XE2LPD_DE_CAP_3DLUT_MASK REG_GENMASK(31, 30)