From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BC9ACD1039A for ; Mon, 28 Oct 2024 12:43:51 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 595A710E499; Mon, 28 Oct 2024 12:43:51 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="RTVInMJb"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.10]) by gabe.freedesktop.org (Postfix) with ESMTPS id C1E5810E499 for ; Mon, 28 Oct 2024 12:43:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1730119430; x=1761655430; h=from:to:cc:subject:in-reply-to:references:date: message-id:mime-version; bh=g0BP5CSCQvH2ZrJ789UyLf2JUb7cgFakH4J7/zoAyjo=; b=RTVInMJbiGAbAddaRZsMbD340nfu41pDEWfzrnA+xBWl13Va/X/KeIp3 vXRBuGFqJ5ySOwSFT1qmMiOBgM1nj3VT68NbbqHkpyhZGNhX+2jeehIDg 793Hi0ioXCueuHKHiEu40siTyq8DJnwPiV2ZcvcB2NMxvw0fG9M5iaS8m Gm9+Z0SrKMIKr13RuagqFJeDxZ7K11KdgCFoDUI/HQhTrqkvkst6reyRN 5xfsJWzBMEzIaqnOhdOPgG4vK8Yxwhvy1FW8wqzNp05Lo26KR9u1+yIq1 0PiHg9pw182oPP+3OnxLkoNS28qlXBDTeqyb89gYZmkvWwcN7HJc6xBEz g==; X-CSE-ConnectionGUID: KdWiIA/kRrKenR276MbuMw== X-CSE-MsgGUID: jdce0B16S2mUc5CIQWehMA== X-IronPort-AV: E=McAfee;i="6700,10204,11238"; a="41079628" X-IronPort-AV: E=Sophos;i="6.11,239,1725346800"; d="scan'208";a="41079628" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Oct 2024 05:43:48 -0700 X-CSE-ConnectionGUID: KzAiAWwWTp6fdXnu9EK5qA== X-CSE-MsgGUID: dYcKK8JNT9Wv1Gc3sbvQUg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,239,1725346800"; d="scan'208";a="104925888" Received: from fdefranc-mobl3.ger.corp.intel.com (HELO localhost) ([10.245.246.21]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Oct 2024 05:43:46 -0700 From: Jani Nikula To: Vinod Govindapillai , intel-gfx@lists.freedesktop.org Cc: vinod.govindapillai@intel.com, uma.shankar@intel.com Subject: Re: [PATCH] drm/i915: Implement Dbuf overlap detection feature starting from LNL In-Reply-To: <20241028120829.78735-1-vinod.govindapillai@intel.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20241028120829.78735-1-vinod.govindapillai@intel.com> Date: Mon, 28 Oct 2024 14:43:43 +0200 Message-ID: <87iktcpfcw.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Mon, 28 Oct 2024, Vinod Govindapillai wrote: > From: Stanislav Lisovskiy > > 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 > Signed-off-by: Vinod Govindapillai > --- > 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) -- Jani Nikula, Intel