From patchwork Fri Aug 19 08:43:09 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: akash.goel@intel.com X-Patchwork-Id: 9289815 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 6E6D560574 for ; Fri, 19 Aug 2016 08:30:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5FA2229301 for ; Fri, 19 Aug 2016 08:30:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 546F729307; Fri, 19 Aug 2016 08:30:10 +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 DAC0F29301 for ; Fri, 19 Aug 2016 08:30:09 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8A3BD6EBB0; Fri, 19 Aug 2016 08:30:07 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTP id DE68B6EBA3 for ; Fri, 19 Aug 2016 08:29:54 +0000 (UTC) Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga103.fm.intel.com with ESMTP; 19 Aug 2016 01:29:54 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.28,544,1464678000"; d="scan'208";a="158284740" Received: from akashgoe-desktop.iind.intel.com ([10.223.82.36]) by fmsmga004.fm.intel.com with ESMTP; 19 Aug 2016 01:29:53 -0700 From: akash.goel@intel.com To: intel-gfx@lists.freedesktop.org Date: Fri, 19 Aug 2016 14:13:09 +0530 Message-Id: <1471596198-30748-11-git-send-email-akash.goel@intel.com> X-Mailer: git-send-email 1.9.2 In-Reply-To: <1471596198-30748-1-git-send-email-akash.goel@intel.com> References: <1471596198-30748-1-git-send-email-akash.goel@intel.com> Cc: Akash Goel Subject: [Intel-gfx] [PATCH 10/19] drm/i915: Add stats for GuC log buffer flush interrupts 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: Akash Goel GuC firmware sends an interrupt to flush the log buffer when it becomes half full. GuC firmware also tracks how many times the buffer overflowed. It would be useful to maintain a statistics of how many flush interrupts were received and for which type of log buffer, along with the overflow count of each buffer type. Augmented i915_log_info debugfs to report back these statistics. v2: - Update the logic to detect multiple overflows between the 2 flush interrupts and also log a message for overflow (Tvrtko) - Track the number of times there was no free sub buffer to capture the GuC log buffer. (Tvrtko) v3: - Fix the printf field width for overflow counter, set it to 10 as per the max value of u32, which takes 10 digits in decimal form. (Tvrtko) v4: - Move the log buffer overflow handling to a new function for better readability. (Tvrtko) Signed-off-by: Akash Goel Reviewed-by: Tvrtko Ursulin --- drivers/gpu/drm/i915/i915_debugfs.c | 28 +++++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_guc_submission.c | 31 +++++++++++++++++++++++++++++- drivers/gpu/drm/i915/i915_irq.c | 2 ++ drivers/gpu/drm/i915/intel_guc.h | 7 +++++++ 4 files changed, 67 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index b2cfcf4..aaa51bc 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -2491,6 +2491,32 @@ static int i915_guc_load_status_info(struct seq_file *m, void *data) return 0; } +static void i915_guc_log_info(struct seq_file *m, + struct drm_i915_private *dev_priv) +{ + struct intel_guc *guc = &dev_priv->guc; + + seq_puts(m, "\nGuC logging stats:\n"); + + seq_printf(m, "\tISR: flush count %10u, overflow count %10u\n", + guc->log.flush_count[GUC_ISR_LOG_BUFFER], + guc->log.total_overflow_count[GUC_ISR_LOG_BUFFER]); + + seq_printf(m, "\tDPC: flush count %10u, overflow count %10u\n", + guc->log.flush_count[GUC_DPC_LOG_BUFFER], + guc->log.total_overflow_count[GUC_DPC_LOG_BUFFER]); + + seq_printf(m, "\tCRASH: flush count %10u, overflow count %10u\n", + guc->log.flush_count[GUC_CRASH_DUMP_LOG_BUFFER], + guc->log.total_overflow_count[GUC_CRASH_DUMP_LOG_BUFFER]); + + seq_printf(m, "\tTotal flush interrupt count: %u\n", + guc->log.flush_interrupt_count); + + seq_printf(m, "\tCapture miss count: %u\n", + guc->log.capture_miss_count); +} + static void i915_guc_client_info(struct seq_file *m, struct drm_i915_private *dev_priv, struct i915_guc_client *client) @@ -2565,6 +2591,8 @@ static int i915_guc_info(struct seq_file *m, void *data) seq_printf(m, "\nGuC execbuf client @ %p:\n", guc.execbuf_client); i915_guc_client_info(m, dev_priv, &client); + i915_guc_log_info(m, dev_priv); + /* Add more as required ... */ return 0; diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c index 6f945ef..d416fae 100644 --- a/drivers/gpu/drm/i915/i915_guc_submission.c +++ b/drivers/gpu/drm/i915/i915_guc_submission.c @@ -996,6 +996,29 @@ static void *guc_get_write_buffer(struct intel_guc *guc) return relay_reserve(guc->log.relay_chan, 0); } +static bool +guc_check_log_buf_overflow(struct intel_guc *guc, + enum guc_log_buffer_type type, unsigned int full_cnt) +{ + unsigned int prev_full_cnt = guc->log.prev_overflow_count[type]; + bool overflow = false; + + if (full_cnt != prev_full_cnt) { + overflow = true; + + guc->log.prev_overflow_count[type] = full_cnt; + guc->log.total_overflow_count[type] += full_cnt - prev_full_cnt; + + if (full_cnt < prev_full_cnt) { + /* buffer_full_cnt is a 4 bit counter */ + guc->log.total_overflow_count[type] += 16; + } + DRM_ERROR_RATELIMITED("GuC log buffer overflow\n"); + } + + return overflow; +} + static unsigned int guc_get_log_buffer_size(enum guc_log_buffer_type type) { switch (type) { @@ -1016,7 +1039,7 @@ static void guc_read_update_log_buffer(struct intel_guc *guc) { struct guc_log_buffer_state *log_buf_state, *log_buf_snapshot_state; struct guc_log_buffer_state log_buf_state_local; - unsigned int buffer_size, write_offset; + unsigned int buffer_size, write_offset, full_cnt; enum guc_log_buffer_type type; void *src_data, *dst_data; @@ -1042,6 +1065,11 @@ static void guc_read_update_log_buffer(struct intel_guc *guc) sizeof(struct guc_log_buffer_state)); buffer_size = guc_get_log_buffer_size(type); write_offset = log_buf_state_local.sampled_write_ptr; + full_cnt = log_buf_state_local.buffer_full_cnt; + + /* Bookkeeping stuff */ + guc->log.flush_count[type] += log_buf_state_local.flush_to_file; + guc_check_log_buf_overflow(guc, type, full_cnt); /* Update the state of shared log buffer */ log_buf_state->read_ptr = write_offset; @@ -1079,6 +1107,7 @@ static void guc_read_update_log_buffer(struct intel_guc *guc) * getting consumed by User at a slow rate. */ DRM_ERROR_RATELIMITED("no sub-buffer to capture logs\n"); + guc->log.capture_miss_count++; } } diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 19c0078..8cbb911 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -1684,6 +1684,8 @@ static void gen9_guc_irq_handler(struct drm_i915_private *dev_priv, u32 gt_iir) /* Handle flush interrupt in bottom half */ queue_work(dev_priv->guc.log.flush_wq, &dev_priv->guc.log.flush_work); + + dev_priv->guc.log.flush_interrupt_count++; } else { /* Not clearing of unhandled event bits won't result in * re-triggering of the interrupt. diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h index 1704495..8598f38 100644 --- a/drivers/gpu/drm/i915/intel_guc.h +++ b/drivers/gpu/drm/i915/intel_guc.h @@ -128,6 +128,13 @@ struct intel_guc_log { struct workqueue_struct *flush_wq; struct work_struct flush_work; struct rchan *relay_chan; + + /* logging related stats */ + u32 capture_miss_count; + u32 flush_interrupt_count; + u32 prev_overflow_count[GUC_MAX_LOG_BUFFER]; + u32 total_overflow_count[GUC_MAX_LOG_BUFFER]; + u32 flush_count[GUC_MAX_LOG_BUFFER]; }; struct intel_guc {