From patchwork Tue Jul 19 12:59:14 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Gordon X-Patchwork-Id: 9237099 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 668486075D for ; Tue, 19 Jul 2016 12:59:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5851926B4A for ; Tue, 19 Jul 2016 12:59:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4D21F26D08; Tue, 19 Jul 2016 12:59:53 +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]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0B15926B4A for ; Tue, 19 Jul 2016 12:59:53 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A19046E527; Tue, 19 Jul 2016 12:59:47 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTP id DBCDB6E3D1 for ; Tue, 19 Jul 2016 12:59:25 +0000 (UTC) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga102.jf.intel.com with ESMTP; 19 Jul 2016 05:59:26 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="5.28,389,1464678000"; d="scan'208"; a="1024757459" Received: from dsgordon-linux2.isw.intel.com ([10.102.226.88]) by fmsmga002.fm.intel.com with ESMTP; 19 Jul 2016 05:59:25 -0700 From: Dave Gordon To: intel-gfx@lists.freedesktop.org Date: Tue, 19 Jul 2016 13:59:14 +0100 Message-Id: <1468933157-22412-2-git-send-email-david.s.gordon@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1468933157-22412-1-git-send-email-david.s.gordon@intel.com> References: <1468933157-22412-1-git-send-email-david.s.gordon@intel.com> Organization: Intel Corporation (UK) Ltd. - Co. Reg. #1134945 - Pipers Way, Swindon SN3 1RJ Subject: [Intel-gfx] [PATCH 2/5] drm/i915/guc: refactor guc_init_doorbell_hw() 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 Signed-off-by: Dave Gordon --- drivers/gpu/drm/i915/i915_guc_submission.c | 54 +++++++++++++++++------------- 1 file changed, 30 insertions(+), 24 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c index d8402e4..dc5f485 100644 --- a/drivers/gpu/drm/i915/i915_guc_submission.c +++ b/drivers/gpu/drm/i915/i915_guc_submission.c @@ -698,32 +698,47 @@ static void gem_release_guc_obj(struct drm_i915_gem_object *obj) kfree(client); } +/* Check that a doorbell register is in the expected state */ +static bool guc_doorbell_check(struct intel_guc *guc, uint16_t db_id) +{ + struct drm_i915_private *dev_priv = guc_to_i915(guc); + i915_reg_t drbreg = GEN8_DRBREGL(db_id); + uint32_t value = I915_READ(drbreg); + bool enabled = (value & GUC_DOORBELL_ENABLED) != 0; + bool expected = test_bit(db_id, guc->doorbell_bitmap); + + if (enabled == expected) + return true; + + DRM_DEBUG_DRIVER("Doorbell %d (reg 0x%x) 0x%x, should be %s\n", + db_id, drbreg.reg, value, + expected ? "active" : "inactive"); + + return false; +} + /* * Borrow the first client to set up & tear down each unused doorbell * in turn, to ensure that all doorbell h/w is (re)initialised. */ static void guc_init_doorbell_hw(struct intel_guc *guc) { - struct drm_i915_private *dev_priv = guc_to_i915(guc); struct i915_guc_client *client = guc->execbuf_client; - uint16_t db_id, i; - int err; + uint16_t db_id; + int i, err; + /* Save client's original doorbell selection */ db_id = client->doorbell_id; for (i = 0; i < GUC_MAX_DOORBELLS; ++i) { - i915_reg_t drbreg = GEN8_DRBREGL(i); - u32 value = I915_READ(drbreg); - - if (test_bit(i, guc->doorbell_bitmap)) + /* Skip if doorbell is OK */ + if (guc_doorbell_check(guc, i)) continue; err = guc_update_doorbell_id(guc, client, i); - - /* Report update failure or unexpectedly active doorbell */ - if (err || (i != db_id && (value & GUC_DOORBELL_ENABLED))) - DRM_DEBUG_DRIVER("Doorbell %d (reg 0x%x) was 0x%x, err %d\n", - i, drbreg.reg, value, err); + if (err) + DRM_DEBUG_DRIVER("Doorbell %d update failed, err %d\n", + i, err); } /* Restore to original value */ @@ -732,18 +747,9 @@ static void guc_init_doorbell_hw(struct intel_guc *guc) DRM_ERROR("Failed to restore doorbell to %d, err %d\n", db_id, err); - for (i = 0; i < GUC_MAX_DOORBELLS; ++i) { - i915_reg_t drbreg = GEN8_DRBREGL(i); - u32 value = I915_READ(drbreg); - - if (test_bit(i, guc->doorbell_bitmap)) - continue; - - if (i != db_id && (value & GUC_DOORBELL_ENABLED)) - DRM_DEBUG_DRIVER("Doorbell %d (reg 0x%x) finally 0x%x\n", - i, drbreg.reg, value); - - } + /* Read back & verify all doorbell registers */ + for (i = 0; i < GUC_MAX_DOORBELLS; ++i) + (void)guc_doorbell_check(guc, i); } /**