From patchwork Tue Aug 23 00:03:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Umesh Nerlige Ramappa X-Patchwork-Id: 12951528 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 AF0F4C32792 for ; Tue, 23 Aug 2022 00:07:02 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 79C0EA754D; Tue, 23 Aug 2022 00:04:52 +0000 (UTC) Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7C987A74C2 for ; Tue, 23 Aug 2022 00:03:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1661213025; x=1692749025; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=MEItcs6gWbfTHv2Y4h3DBvV6+v7UVGqqVsNc91Q5Ezs=; b=lCGQfwgJaBcjMWnRivlGsFCDcYWEJP60R7a0kM3kXlxRKNdq8Kgo+H7d U/GFlJIbsXmm2k/W+KGZmbWUARh/JFgnDu98N3Ganj238Um7xq3pCQvXA 1BKVP9eXOIY+KmxZHu3BF24CNY4WsbE1B2R69t1qF1Qg7sAiNyDbUDVAN bSjmyLbH3x0oZZXcrHwEl92wlmCfJok/JGCxxUSjWiuCsYXC9UdkPz7ph tFD5t/j6AU+W2jOHJj6oG2CLgOnA4iPmi6/t4f5+R/QS6nnTKbfZtoWUE aCVZSHNTKKyYWl/SuA6CFZ10vrbFdvAaN7dOtyrYgCJZMiYGkT/4zAbxq g==; X-IronPort-AV: E=McAfee;i="6500,9779,10447"; a="273304842" X-IronPort-AV: E=Sophos;i="5.93,255,1654585200"; d="scan'208";a="273304842" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Aug 2022 17:03:42 -0700 X-IronPort-AV: E=Sophos;i="5.93,255,1654585200"; d="scan'208";a="669775554" Received: from dut042-dg2frd.fm.intel.com ([10.105.19.4]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Aug 2022 17:03:42 -0700 From: Umesh Nerlige Ramappa To: intel-gfx@lists.freedesktop.org, Lionel G Landwerlin , Ashutosh Dixit Date: Tue, 23 Aug 2022 00:03:39 +0000 Message-Id: <20220823000342.281222-17-umesh.nerlige.ramappa@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220823000342.281222-1-umesh.nerlige.ramappa@intel.com> References: <20220823000342.281222-1-umesh.nerlige.ramappa@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 16/19] drm/i915/perf: Apply Wa_18013179988 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" OA reports in the OA buffer contain an OA timestamp field that helps user calculate delta between 2 OA reports. The calculation relies on the CS timestamp frequency to convert the timestamp value to nanoseconds. The CS timestamp frequency is a function of the CTC_SHIFT value in RPM_CONFIG0. In DG2, OA unit assumes that the CTC_SHIFT is 3, instead of using the actual value from RPM_CONFIG0. At the user level, this results in an error in calculating delta between 2 OA reports since the OA timestamp is not shifted in the same manner as CS timestamp. To resolve this, return actual OA timestamp frequency to the user in i915_getparam_ioctl. Signed-off-by: Umesh Nerlige Ramappa --- drivers/gpu/drm/i915/i915_getparam.c | 3 +++ drivers/gpu/drm/i915/i915_perf.c | 30 ++++++++++++++++++++++++++-- drivers/gpu/drm/i915/i915_perf.h | 2 ++ include/uapi/drm/i915_drm.h | 6 ++++++ 4 files changed, 39 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_getparam.c b/drivers/gpu/drm/i915/i915_getparam.c index 6fd15b39570c..cdb2208ecabd 100644 --- a/drivers/gpu/drm/i915/i915_getparam.c +++ b/drivers/gpu/drm/i915/i915_getparam.c @@ -175,6 +175,9 @@ int i915_getparam_ioctl(struct drm_device *dev, void *data, case I915_PARAM_PERF_REVISION: value = i915_perf_ioctl_version(); break; + case I915_PARAM_OA_TIMESTAMP_FREQUENCY: + value = i915_perf_oa_timestamp_frequency(i915); + break; default: DRM_DEBUG("Unknown parameter %d\n", param->param); return -EINVAL; diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c index ce379ac88a60..00371b4146d7 100644 --- a/drivers/gpu/drm/i915/i915_perf.c +++ b/drivers/gpu/drm/i915/i915_perf.c @@ -3189,6 +3189,30 @@ get_sseu_config(struct intel_sseu *out_sseu, return i915_gem_user_to_context_sseu(engine->gt, drm_sseu, out_sseu); } +/* + * OA timestamp frequency = CS timestamp frequency in most platforms. On some + * platforms OA unit ignores the CTC_SHIFT and the 2 timestamps differ. In such + * cases, return the adjusted CS timestamp frequency to the user. + */ +u32 i915_perf_oa_timestamp_frequency(struct drm_i915_private *i915) +{ + /* Wa_18013179988:dg2 */ + if (IS_DG2(i915)) { + intel_wakeref_t wakeref; + u32 reg, shift; + + with_intel_runtime_pm(to_gt(i915)->uncore->rpm, wakeref) + reg = intel_uncore_read(to_gt(i915)->uncore, RPM_CONFIG0); + + shift = (reg & GEN10_RPM_CONFIG0_CTC_SHIFT_PARAMETER_MASK) >> + GEN10_RPM_CONFIG0_CTC_SHIFT_PARAMETER_SHIFT; + + return to_gt(i915)->clock_frequency << (3 - shift); + } + + return to_gt(i915)->clock_frequency; +} + /** * i915_oa_stream_init - validate combined props for OA stream and init * @stream: An i915 perf stream @@ -3913,8 +3937,10 @@ i915_perf_open_ioctl_locked(struct i915_perf *perf, static u64 oa_exponent_to_ns(struct i915_perf *perf, int exponent) { - return intel_gt_clock_interval_to_ns(to_gt(perf->i915), - 2ULL << exponent); + u64 nom = (2ULL << exponent) * NSEC_PER_SEC; + u32 den = i915_perf_oa_timestamp_frequency(perf->i915); + + return div_u64(nom + den - 1, den); } static __always_inline bool diff --git a/drivers/gpu/drm/i915/i915_perf.h b/drivers/gpu/drm/i915/i915_perf.h index 1d1329e5af3a..f96e09a4af04 100644 --- a/drivers/gpu/drm/i915/i915_perf.h +++ b/drivers/gpu/drm/i915/i915_perf.h @@ -57,4 +57,6 @@ static inline void i915_oa_config_put(struct i915_oa_config *oa_config) kref_put(&oa_config->ref, i915_oa_config_release); } +u32 i915_perf_oa_timestamp_frequency(struct drm_i915_private *i915); + #endif /* __I915_PERF_H__ */ diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h index 9168412e0da8..18ada8ce1a58 100644 --- a/include/uapi/drm/i915_drm.h +++ b/include/uapi/drm/i915_drm.h @@ -749,6 +749,12 @@ typedef struct drm_i915_irq_wait { /* Query if the kernel supports the I915_USERPTR_PROBE flag. */ #define I915_PARAM_HAS_USERPTR_PROBE 56 +/* + * Frequency of the timestamps in OA reports. This used to be the same as the CS + * timestamp frequency, but differs on some platforms. + */ +#define I915_PARAM_OA_TIMESTAMP_FREQUENCY 57 + /* Must be kept compact -- no holes and well documented */ /**