From patchwork Fri May 18 18:12:32 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yunwei Zhang X-Patchwork-Id: 10411783 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id ED24C602C2 for ; Fri, 18 May 2018 18:20:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DCC2F28A7F for ; Fri, 18 May 2018 18:20:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D119628A81; Fri, 18 May 2018 18:20:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 292E728A7F for ; Fri, 18 May 2018 18:20:58 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C38B96EE9D; Fri, 18 May 2018 18:20:57 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5D9B36EE9D for ; Fri, 18 May 2018 18:20:56 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 May 2018 11:20:55 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,415,1520924400"; d="scan'208";a="229733264" Received: from yzubuntu.fm.intel.com ([10.19.83.121]) by fmsmga005.fm.intel.com with ESMTP; 18 May 2018 11:20:55 -0700 From: Yunwei Zhang To: intel-gfx@lists.freedesktop.org Date: Fri, 18 May 2018 11:12:32 -0700 Message-Id: <1526667152-9371-1-git-send-email-yunwei.zhang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1526331868-14768-1-git-send-email-yunwei.zhang@intel.com> References: <1526331868-14768-1-git-send-email-yunwei.zhang@intel.com> Subject: [Intel-gfx] [PATCH v2 1/3] drm/i915/cnl: Implement WaProgramMgsrForCorrectSliceSpecificMmioReads X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP WaProgramMgsrForCorrectSliceSpecificMmioReads dictate that before any MMIO read into Slice/Subslice specific registers, MCR packet control register(0xFDC) needs to be programmed to point to any enabled slice/subslice pair. Otherwise, incorrect value will be returned. However, that means each subsequent MMIO read will be forwarded to a specific slice/subslice combination as read is unicast. This is OK since slice/subslice specific register values are consistent in almost all cases across slice/subslice. There are rare occasions such as INSTDONE that this value will be dependent on slice/subslice combo, in such cases, we need to program 0xFDC and recover this after. This is already covered by read_subslice_reg. Also, 0xFDC will lose its information after TDR/engine reset/power state change. References: HSD#1405586840, BSID#0575 v2: - use fls() instead of find_last_bit() (Chris) - added INTEL_SSEU to extract sseu from device info. (Chris) v3: - rebase on latest tip v5: - Added references (Mika) - Change the ordered of passing arguments and etc. (Ursulin) v7: - Moved WA explanation Comments(Oscar) - Rebased. v8: - Renamed sanitize_mcr to calculate_s_ss_select. (Oscar) - calculate s/ss selector instead of whole mcr. (Oscar) Cc: Oscar Mateo Cc: Michel Thierry Cc: Joonas Lahtinen Cc: Chris Wilson Cc: Mika Kuoppala Cc: Tvrtko Ursulin Signed-off-by: Yunwei Zhang --- drivers/gpu/drm/i915/i915_drv.h | 2 ++ drivers/gpu/drm/i915/intel_engine_cs.c | 33 +++++++++++++++++++++++++++----- drivers/gpu/drm/i915/intel_workarounds.c | 32 +++++++++++++++++++++++++++++++ 3 files changed, 62 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index e33c380..e697785 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2744,6 +2744,8 @@ int vlv_force_gfx_clock(struct drm_i915_private *dev_priv, bool on); int intel_engines_init_mmio(struct drm_i915_private *dev_priv); int intel_engines_init(struct drm_i915_private *dev_priv); +u32 intel_calculate_s_ss_select(struct drm_i915_private *dev_priv); + /* intel_hotplug.c */ void intel_hpd_irq_handler(struct drm_i915_private *dev_priv, u32 pin_mask, u32 long_mask); diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c index 26f9f8a..511975f 100644 --- a/drivers/gpu/drm/i915/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/intel_engine_cs.c @@ -819,12 +819,32 @@ const char *i915_cache_level_str(struct drm_i915_private *i915, int type) } } +u32 intel_calculate_s_ss_select(struct drm_i915_private *dev_priv) +{ + const struct sseu_dev_info *sseu = &(INTEL_INFO(dev_priv)->sseu); + u32 mcr_s_ss_mask; + u32 mcr_s_ss_select; + u32 slice = fls(sseu->slice_mask); + u32 subslice = fls(sseu->subslice_mask[slice]); + + mcr_s_ss_mask = GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK; + + if (INTEL_GEN(dev_priv) == 10) + mcr_s_ss_select = GEN8_MCR_SLICE(slice) | + GEN8_MCR_SUBSLICE(subslice); + else + mcr_s_ss_select = 0; + + return mcr_s_ss_select; +} + static inline uint32_t read_subslice_reg(struct drm_i915_private *dev_priv, int slice, int subslice, i915_reg_t reg) { uint32_t mcr_slice_subslice_mask; uint32_t mcr_slice_subslice_select; + uint32_t default_mcr_s_ss_select; uint32_t mcr; uint32_t ret; enum forcewake_domains fw_domains; @@ -841,6 +861,8 @@ read_subslice_reg(struct drm_i915_private *dev_priv, int slice, GEN8_MCR_SUBSLICE(subslice); } + default_mcr_s_ss_select = intel_calculate_s_ss_select(dev_priv); + fw_domains = intel_uncore_forcewake_for_reg(dev_priv, reg, FW_REG_READ); fw_domains |= intel_uncore_forcewake_for_reg(dev_priv, @@ -851,11 +873,10 @@ read_subslice_reg(struct drm_i915_private *dev_priv, int slice, intel_uncore_forcewake_get__locked(dev_priv, fw_domains); mcr = I915_READ_FW(GEN8_MCR_SELECTOR); - /* - * The HW expects the slice and sublice selectors to be reset to 0 - * after reading out the registers. - */ - WARN_ON_ONCE(mcr & mcr_slice_subslice_mask); + + WARN_ON_ONCE((mcr & mcr_slice_subslice_mask) != + default_mcr_s_ss_select); + mcr &= ~mcr_slice_subslice_mask; mcr |= mcr_slice_subslice_select; I915_WRITE_FW(GEN8_MCR_SELECTOR, mcr); @@ -863,6 +884,8 @@ read_subslice_reg(struct drm_i915_private *dev_priv, int slice, ret = I915_READ_FW(reg); mcr &= ~mcr_slice_subslice_mask; + mcr |= default_mcr_s_ss_select; + I915_WRITE_FW(GEN8_MCR_SELECTOR, mcr); intel_uncore_forcewake_put__locked(dev_priv, fw_domains); diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c index 2df3538..d814368 100644 --- a/drivers/gpu/drm/i915/intel_workarounds.c +++ b/drivers/gpu/drm/i915/intel_workarounds.c @@ -672,8 +672,40 @@ static void cfl_gt_workarounds_apply(struct drm_i915_private *dev_priv) GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS); } +static void wa_init_mcr(struct drm_i915_private *dev_priv) +{ + u32 mcr; + u32 mcr_slice_subslice_mask; + + mcr = I915_READ(GEN8_MCR_SELECTOR); + + if (INTEL_GEN(dev_priv) >= 11) + mcr_slice_subslice_mask = GEN11_MCR_SLICE_MASK | + GEN11_MCR_SUBSLICE_MASK; + else + mcr_slice_subslice_mask = GEN8_MCR_SLICE_MASK | + GEN8_MCR_SUBSLICE_MASK; + /* + * WaProgramMgsrForCorrectSliceSpecificMmioReads:cnl + * Before any MMIO read into slice/subslice specific registers, MCR + * packet control register needs to be programmed to point to any + * enabled s/ss pair. Otherwise, incorrect values will be returned. + * This means each subsequent MMIO read will be forwarded to an + * specific s/ss combination, but this is OK since these registers + * are consistent across s/ss in almost all cases. In the rare + * occasions, such as INSTDONE, where this value is dependent + * on s/ss combo, the read should be done with read_subslice_reg. + */ + mcr &= ~mcr_slice_subslice_mask; + mcr |= intel_calculate_s_ss_select(dev_priv); + I915_WRITE(GEN8_MCR_SELECTOR, mcr); +} + static void cnl_gt_workarounds_apply(struct drm_i915_private *dev_priv) { + /* WaProgramMgsrForCorrectSliceSpecificMmioReads: cnl */ + wa_init_mcr(dev_priv); + /* WaDisableI2mCycleOnWRPort:cnl (pre-prod) */ if (IS_CNL_REVID(dev_priv, CNL_REVID_B0, CNL_REVID_B0)) I915_WRITE(GAMT_CHKN_BIT_REG,