From patchwork Tue Aug 21 10:11:38 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 10571329 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 B6E57920 for ; Tue, 21 Aug 2018 10:11:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A1B3B29E1C for ; Tue, 21 Aug 2018 10:11:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8D5C229E02; Tue, 21 Aug 2018 10:11:45 +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=-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 2EC5429DC9 for ; Tue, 21 Aug 2018 10:11:44 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4ECB36E2C2; Tue, 21 Aug 2018 10:11:44 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from fireflyinternet.com (mail.fireflyinternet.com [109.228.58.192]) by gabe.freedesktop.org (Postfix) with ESMTPS id B774E6E2C2 for ; Tue, 21 Aug 2018 10:11:42 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from haswell.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 13103532-1500050 for ; Tue, 21 Aug 2018 11:11:42 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Tue, 21 Aug 2018 11:11:38 +0100 Message-Id: <20180821101138.15822-1-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.18.0 Subject: [Intel-gfx] [CI] drm/i915: Correct CSB probing for engine state dumper 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 Since we no longer maintain our read position in the CSB pointers register, it always returns 0 and not where we last read up to. As a result the CSB probing in the state dumper starts from 0, either missing entries or showing stale one. Signed-off-by: Chris Wilson Cc: Mika Kuoppala Reviewed-by: Mika Kuoppala --- drivers/gpu/drm/i915/intel_engine_cs.c | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c index 8628567d8f6e..1a34e8ff82d5 100644 --- a/drivers/gpu/drm/i915/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/intel_engine_cs.c @@ -1345,20 +1345,19 @@ static void intel_engine_print_registers(const struct intel_engine_cs *engine, if (HAS_EXECLISTS(dev_priv)) { const u32 *hws = &engine->status_page.page_addr[I915_HWS_CSB_BUF0_INDEX]; - u32 ptr, read, write; unsigned int idx; + u8 read, write; drm_printf(m, "\tExeclist status: 0x%08x %08x\n", I915_READ(RING_EXECLIST_STATUS_LO(engine)), I915_READ(RING_EXECLIST_STATUS_HI(engine))); - ptr = I915_READ(RING_CONTEXT_STATUS_PTR(engine)); - read = GEN8_CSB_READ_PTR(ptr); - write = GEN8_CSB_WRITE_PTR(ptr); - drm_printf(m, "\tExeclist CSB read %d [%d cached], write %d [%d from hws], tasklet queued? %s (%s)\n", - read, execlists->csb_head, - write, - intel_read_status_page(engine, intel_hws_csb_write_index(engine->i915)), + read = execlists->csb_head; + write = READ_ONCE(*execlists->csb_write); + + drm_printf(m, "\tExeclist CSB read %d, write %d [mmio:%d], tasklet queued? %s (%s)\n", + read, write, + GEN8_CSB_WRITE_PTR(I915_READ(RING_CONTEXT_STATUS_PTR(engine))), yesno(test_bit(TASKLET_STATE_SCHED, &engine->execlists.tasklet.state)), enableddisabled(!atomic_read(&engine->execlists.tasklet.count))); @@ -1370,12 +1369,12 @@ static void intel_engine_print_registers(const struct intel_engine_cs *engine, write += GEN8_CSB_ENTRIES; while (read < write) { idx = ++read % GEN8_CSB_ENTRIES; - drm_printf(m, "\tExeclist CSB[%d]: 0x%08x [0x%08x in hwsp], context: %d [%d in hwsp]\n", + drm_printf(m, "\tExeclist CSB[%d]: 0x%08x [mmio:0x%08x], context: %d [mmio:%d]\n", idx, - I915_READ(RING_CONTEXT_STATUS_BUF_LO(engine, idx)), hws[idx * 2], - I915_READ(RING_CONTEXT_STATUS_BUF_HI(engine, idx)), - hws[idx * 2 + 1]); + I915_READ(RING_CONTEXT_STATUS_BUF_LO(engine, idx)), + hws[idx * 2 + 1], + I915_READ(RING_CONTEXT_STATUS_BUF_HI(engine, idx))); } rcu_read_lock();