From patchwork Fri Aug 31 11:09:42 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kumar, Mahesh" X-Patchwork-Id: 10583621 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8AEA7112B for ; Fri, 31 Aug 2018 11:07:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 785422B2DA for ; Fri, 31 Aug 2018 11:07:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6C6B72B694; Fri, 31 Aug 2018 11:07:32 +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 07C762B2DA for ; Fri, 31 Aug 2018 11:07:31 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 421E16E8BB; Fri, 31 Aug 2018 11:07:31 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id AF2366E8B6 for ; Fri, 31 Aug 2018 11:07:29 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 31 Aug 2018 04:07:29 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,311,1531810800"; d="scan'208";a="69332135" Received: from unknown (HELO localhost.localdomain) ([10.223.25.241]) by orsmga007.jf.intel.com with ESMTP; 31 Aug 2018 04:07:14 -0700 From: Mahesh Kumar To: intel-gfx@lists.freedesktop.org Date: Fri, 31 Aug 2018 16:39:42 +0530 Message-Id: <20180831110942.9234-1-mahesh1.kumar@intel.com> X-Mailer: git-send-email 2.16.2 In-Reply-To: References: Subject: [Intel-gfx] [PATCH V4 3/5] drm/i915: Implement 16GB dimm wa for latency level-0 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 Memory with 16GB dimms require an increase of 1us in level-0 latency. This patch implements the same. Bspec: 4381 changes since V1: - s/memdev_info/dram_info - make skl_is_16gb_dimm pure function Changes since V2: - make is_16gb_dimm more generic - rebase Changes since V3: - Simplify condition (Maarten) Signed-off-by: Mahesh Kumar --- drivers/gpu/drm/i915/i915_drv.c | 33 +++++++++++++++++++++++++++++++-- drivers/gpu/drm/i915/i915_drv.h | 3 +++ drivers/gpu/drm/i915/intel_pm.c | 10 ++++++++++ 3 files changed, 44 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index e09e9ce8fadf..2bc74c01a0e5 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1088,6 +1088,21 @@ static enum dram_rank skl_get_dimm_rank(u8 size, u32 rank) return I915_DRAM_RANK_INVALID; } +static bool +skl_is_16gb_dimm(enum dram_rank rank, u8 size, u8 width) +{ + if (rank == I915_DRAM_RANK_SINGLE && width == 8 && size == 16) + return true; + else if (rank == I915_DRAM_RANK_DUAL && width == 8 && size == 32) + return true; + else if (rank == SKL_DRAM_RANK_SINGLE && width == 16 && size == 8) + return true; + else if (rank == SKL_DRAM_RANK_DUAL && width == 16 && size == 16) + return true; + + return false; +} + static int skl_dram_get_channel_info(struct dram_channel_info *ch, u32 val) { @@ -1125,6 +1140,11 @@ skl_dram_get_channel_info(struct dram_channel_info *ch, u32 val) else ch->rank = I915_DRAM_RANK_SINGLE; + ch->is_16gb_dimm = skl_is_16gb_dimm(ch->l_info.rank, ch->l_info.size, + ch->l_info.width) || + skl_is_16gb_dimm(ch->s_info.rank, ch->s_info.size, + ch->s_info.width); + DRM_DEBUG_KMS("(size:width:rank) L(%dGB:X%d:%s) S(%dGB:X%d:%s)\n", ch->l_info.size, ch->l_info.width, ch->l_info.rank ? "dual" : "single", @@ -1157,6 +1177,8 @@ skl_dram_get_channels_info(struct drm_i915_private *dev_priv) return -EINVAL; } + dram_info->valid_dimm = true; + /* * If any of the channel is single rank channel, worst case output * will be same as if single rank memory, so consider single rank @@ -1172,6 +1194,10 @@ skl_dram_get_channels_info(struct drm_i915_private *dev_priv) DRM_INFO("couldn't get memory rank information\n"); return -EINVAL; } + + if (ch0.is_16gb_dimm || ch1.is_16gb_dimm) + dram_info->is_16gb_dimm = true; + return 0; } @@ -1284,6 +1310,7 @@ bxt_get_dram_info(struct drm_i915_private *dev_priv) return -EINVAL; } + dram_info->valid_dimm = true; dram_info->valid = true; return 0; } @@ -1296,6 +1323,8 @@ intel_get_dram_info(struct drm_i915_private *dev_priv) int ret; dram_info->valid = false; + dram_info->valid_dimm = false; + dram_info->is_16gb_dimm = false; dram_info->rank = I915_DRAM_RANK_INVALID; dram_info->bandwidth_kbps = 0; dram_info->num_channels = 0; @@ -1319,9 +1348,9 @@ intel_get_dram_info(struct drm_i915_private *dev_priv) sprintf(bandwidth_str, "unknown"); DRM_DEBUG_KMS("DRAM bandwidth:%s, total-channels: %u\n", bandwidth_str, dram_info->num_channels); - DRM_DEBUG_KMS("DRAM rank: %s rank\n", + DRM_DEBUG_KMS("DRAM rank: %s rank 16GB-dimm:%s\n", (dram_info->rank == I915_DRAM_RANK_DUAL) ? - "dual" : "single"); + "dual" : "single", yesno(dram_info->is_16gb_dimm)); } /** diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 9195e99a6aba..fe08a883e39f 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1946,6 +1946,8 @@ struct drm_i915_private { struct dram_info { bool valid; + bool valid_dimm; + bool is_16gb_dimm; u8 num_channels; enum dram_rank { I915_DRAM_RANK_INVALID = 0, @@ -2174,6 +2176,7 @@ struct dram_channel_info { enum dram_rank rank; } l_info, s_info; enum dram_rank rank; + bool is_16gb_dimm; }; static inline struct drm_i915_private *to_i915(const struct drm_device *dev) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index d99e5fabe93c..09463e3d7948 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -2875,6 +2875,16 @@ static void intel_read_wm_latency(struct drm_i915_private *dev_priv, } } + /* + * WA Level-0 adjustment for 16GB DIMMs: SKL+ + * If we could not get dimm info enable this WA to prevent from + * any underrun. If not able to get Dimm info assume 16GB dimm + * to avoid any underrun. + */ + if (!dev_priv->dram_info.valid_dimm || + dev_priv->dram_info.is_16gb_dimm) + wm[0] += 1; + } else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) { uint64_t sskpd = I915_READ64(MCH_SSKPD);