From patchwork Fri Sep 9 08:01:01 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kumar, Mahesh" X-Patchwork-Id: 9322615 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 E012160231 for ; Fri, 9 Sep 2016 07:57:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D41B029CB4 for ; Fri, 9 Sep 2016 07:57:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C8E2229CBE; Fri, 9 Sep 2016 07:57:45 +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=-4.2 required=2.0 tests=BAYES_00, 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 5408429CB4 for ; Fri, 9 Sep 2016 07:57:45 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3E3736E72B; Fri, 9 Sep 2016 07:57:44 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id 929186E72C for ; Fri, 9 Sep 2016 07:57:42 +0000 (UTC) Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga104.fm.intel.com with ESMTP; 09 Sep 2016 00:57:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.30,304,1470726000"; d="scan'208";a="876758313" Received: from kumarmah-desk.iind.intel.com ([10.223.26.44]) by orsmga003.jf.intel.com with ESMTP; 09 Sep 2016 00:57:20 -0700 From: "Kumar, Mahesh" To: intel-gfx@lists.freedesktop.org Date: Fri, 9 Sep 2016 13:31:01 +0530 Message-Id: <20160909080106.17506-5-mahesh1.kumar@intel.com> X-Mailer: git-send-email 2.8.3 In-Reply-To: <20160909080106.17506-1-mahesh1.kumar@intel.com> References: <20160909080106.17506-1-mahesh1.kumar@intel.com> Cc: paulo.r.zanoni@intel.com Subject: [Intel-gfx] [PATCH v3 4/9] drm/i915: Decode system memory bandwidth X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 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 From: Mahesh Kumar This patch adds support to decode system memory bandwidth which will be used for arbitrated display memory percentage calculation in GEN9 based system. Signed-off-by: Mahesh Kumar --- drivers/gpu/drm/i915/i915_drv.c | 96 +++++++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_drv.h | 18 ++++++++ drivers/gpu/drm/i915/i915_reg.h | 25 +++++++++++ 3 files changed, 139 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 02c34d6..0a4f18d 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -973,6 +973,96 @@ static void intel_sanitize_options(struct drm_i915_private *dev_priv) DRM_DEBUG_DRIVER("use GPU sempahores? %s\n", yesno(i915.semaphores)); } +static void +intel_get_memdev_info(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = to_i915(dev); + uint32_t val = 0; + uint32_t mem_speed = 0; + uint8_t dram_type; + uint32_t dram_channel; + uint8_t num_channel; + bool rank_valid = false; + + if (!IS_GEN9(dev_priv)) + goto exit; + + val = I915_READ(P_CR_MC_BIOS_REQ_0_0_0); + mem_speed = div_u64((uint64_t) (val & REQ_DATA_MASK) * + MEMORY_FREQ_MULTIPLIER, 1000); + + if (mem_speed == 0) + goto exit; + + dev_priv->memdev_info.valid = true; + dev_priv->memdev_info.mem_speed = mem_speed; + dram_type = (val >> DRAM_TYPE_SHIFT) & DRAM_TYPE_MASK; + dram_channel = (val >> DRAM_CHANNEL_SHIFT) & DRAM_CHANNEL_MASK; + num_channel = hweight32(dram_channel); + + /* + * The lpddr3 and lpddr4 technologies can have 1-4 channels and the + * channels are 32bits wide; while ddr3l technologies can have 1-2 + * channels and the channels are 64 bits wide. But SV team found that in + * case of single 64 bit wide DDR3L dimms two bits were set and system + * with two DDR3L 64bit dimm all four bits were set. + */ + + switch (dram_type) { + case DRAM_TYPE_LPDDR3: + case DRAM_TYPE_LPDDR4: + dev_priv->memdev_info.data_width = 4; + dev_priv->memdev_info.num_channel = num_channel; + break; + case DRAM_TYPE_DDR3L: + dev_priv->memdev_info.data_width = 8; + dev_priv->memdev_info.num_channel = num_channel / 2; + break; + default: + dev_priv->memdev_info.data_width = 4; + dev_priv->memdev_info.num_channel = num_channel; + } + + /* + * Now read each DUNIT8/9/10/11 to check the rank of each dimms. + * all the dimms should have same rank as in first valid Dimm + */ +#define D_CR_DRP0_DUNIT_INVALID 0xFFFFFFFF + + dev_priv->memdev_info.rank_valid = true; + if (I915_READ(D_CR_DRP0_DUNIT8) != D_CR_DRP0_DUNIT_INVALID) { + val = I915_READ(D_CR_DRP0_DUNIT8); + rank_valid = true; + } else if (I915_READ(D_CR_DRP0_DUNIT9) != D_CR_DRP0_DUNIT_INVALID) { + val = I915_READ(D_CR_DRP0_DUNIT9); + rank_valid = true; + } else if (I915_READ(D_CR_DRP0_DUNIT10) != D_CR_DRP0_DUNIT_INVALID) { + val = I915_READ(D_CR_DRP0_DUNIT10); + rank_valid = true; + } else if (I915_READ(D_CR_DRP0_DUNIT11) != D_CR_DRP0_DUNIT_INVALID) { + val = I915_READ(D_CR_DRP0_DUNIT11); + rank_valid = true; + } +#undef D_CR_DRP0_DUNIT_INVALID + + if (rank_valid) { + dev_priv->memdev_info.rank_valid = true; + dev_priv->memdev_info.rank = (val & DRAM_RANK_MASK); + } + + DRM_DEBUG_DRIVER("valid:%s speed-%d width-%d num_channel-%d\n", + dev_priv->memdev_info.valid ? "true" : "false", + dev_priv->memdev_info.mem_speed, + dev_priv->memdev_info.data_width, + dev_priv->memdev_info.num_channel); + DRM_DEBUG_DRIVER("rank_valid:%s rank-%d\n", + dev_priv->memdev_info.rank_valid ? "true" : "false", + dev_priv->memdev_info.rank); + return; +exit: + dev_priv->memdev_info.valid = false; +} + /** * i915_driver_init_hw - setup state requiring device access * @dev_priv: device private @@ -1076,6 +1166,12 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv) DRM_DEBUG_DRIVER("can't enable MSI"); } + /* + * Fill the memdev structure to get the system raw bandwidth + * This will be used by WM algorithm, to implement GEN9 based WA + */ + intel_get_memdev_info(dev); + return 0; out_ggtt: diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 4ec23e5..4313992 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2036,6 +2036,24 @@ struct drm_i915_private { bool distrust_bios_wm; } wm; + struct { + /* + * memory device info + * valid: memory info is valid or not + * mem_speed: memory freq in KHz + * channel_width: Channel width in bytes + * num_channel: total number of channels + * rank: 0-rank disable, 1-Single rank, 2-dual rank + */ + bool valid; + uint32_t mem_speed; + uint8_t data_width; + uint8_t num_channel; + bool rank_valid; + uint8_t rank; + } memdev_info; + + struct i915_runtime_pm pm; /* Abstract the submission mechanism (legacy ringbuffer or execlists) away */ diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index a29d707..b38445c 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -7716,6 +7716,31 @@ enum { #define DC_STATE_DEBUG_MASK_CORES (1<<0) #define DC_STATE_DEBUG_MASK_MEMORY_UP (1<<1) +#define P_CR_MC_BIOS_REQ_0_0_0 _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x7114) +#define REQ_DATA_MASK (0x3F << 0) +#define DRAM_TYPE_SHIFT 24 +#define DRAM_TYPE_MASK 0x7 +#define DRAM_CHANNEL_SHIFT 12 +#define DRAM_CHANNEL_MASK 0xF + +#define DRAM_TYPE_LPDDR3 0x1 +#define DRAM_TYPE_LPDDR4 0x2 +#define DRAM_TYPE_DDR3L 0x4 +/* + * BIOS programs this field of REQ_DATA [5:0] in integer + * multiple of 133330 KHz (133.33MHz) + */ +#define MEMORY_FREQ_MULTIPLIER 0x208D2 +#define D_CR_DRP0_DUNIT8 _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x1000) +#define D_CR_DRP0_DUNIT9 _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x1200) +#define D_CR_DRP0_DUNIT10 _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x1400) +#define D_CR_DRP0_DUNIT11 _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x1600) +#define D_CR_DRP0_RKEN0 (1 << 0) +#define D_CR_DRP0_RKEN1 (1 << 1) +#define DRAM_RANK_MASK 0x3 +#define DRAM_SINGLE_RANK 0x1 +#define DRAM_DUAL_RANK 0x3 + /* Please see hsw_read_dcomp() and hsw_write_dcomp() before using this register, * since on HSW we can't write to it using I915_WRITE. */ #define D_COMP_HSW _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5F0C)