From patchwork Tue Jun 7 19:29:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Lyude Paul X-Patchwork-Id: 12872312 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 1FFD3CCA47E for ; Tue, 7 Jun 2022 19:39:08 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id AF58110E2AE; Tue, 7 Jun 2022 19:39:06 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0BE3B10E338 for ; Tue, 7 Jun 2022 19:39:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1654630744; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=J6UCoAjTBIhFULpI3th29L45PAQqa/yX0JAym4+DcxE=; b=B8wcz0m7DmpFiP6DYDwYvmccLlkfZdaB4QQQ7yAbIf3Hh7p7H1xvZoT4o+JKusmjDpo8Ya HY5bFqn9ojA9kFhTX+xO/hYFtX+doyRiYyVdyXgRv0Cqe8+Them+nwykVjYzil+QigbCBi +ay0R0uRzEXl5qEHHdFNaRqUBN+qCKI= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-299-en72QhIkMI6WKokoHAimKg-1; Tue, 07 Jun 2022 15:38:59 -0400 X-MC-Unique: en72QhIkMI6WKokoHAimKg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D5269800D91; Tue, 7 Jun 2022 19:37:32 +0000 (UTC) Received: from emerald.redhat.com (unknown [10.22.9.252]) by smtp.corp.redhat.com (Postfix) with ESMTP id C3AC82C0D502; Tue, 7 Jun 2022 19:37:03 +0000 (UTC) From: Lyude Paul To: dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, amd-gfx@lists.freedesktop.org Subject: [RESEND RFC 16/18] drm/display/dp_mst: Maintain time slot allocations when deleting payloads Date: Tue, 7 Jun 2022 15:29:31 -0400 Message-Id: <20220607192933.1333228-17-lyude@redhat.com> In-Reply-To: <20220607192933.1333228-1-lyude@redhat.com> References: <20220607192933.1333228-1-lyude@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas Zimmermann , Jani Nikula , Daniel Vetter , Javier Martinez Canillas , open list , Bhawanpreet Lakha , David Airlie , Fangzhi Zuo , Wayne Lin , Sean Paul Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Currently, we set drm_dp_atomic_payload->time_slots to 0 in order to indicate that we're about to delete a payload in the current atomic state. Since we're going to be dropping all of the legacy code for handling the payload table however, we need to be able to ensure that we still keep track of the current time slot allocations for each payload so we can reuse this info when asking the root MST hub to delete payloads. We'll also be using it to recalculate the start slots of each VC. So, let's keep track of the intent of a payload in drm_dp_atomic_payload by adding ->delete, which we set whenever we're planning on deleting a payload during the current atomic commit. Signed-off-by: Lyude Paul Cc: Wayne Lin Cc: Ville Syrjälä Cc: Fangzhi Zuo Cc: Jani Nikula Cc: Imre Deak Cc: Daniel Vetter Cc: Sean Paul --- drivers/gpu/drm/display/drm_dp_mst_topology.c | 14 +++++++------- include/drm/display/drm_dp_mst_helper.h | 5 ++++- 2 files changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index 70adb8db4335..10d26a7e028c 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -4410,7 +4410,7 @@ int drm_dp_atomic_find_time_slots(struct drm_atomic_state *state, * releasing and allocating the same timeslot allocation, * which is an error */ - if (WARN_ON(!prev_slots)) { + if (drm_WARN_ON(mgr->dev, payload->delete)) { drm_err(mgr->dev, "cannot allocate and release time slots on [MST PORT:%p] in the same state\n", port); @@ -4515,10 +4515,10 @@ int drm_dp_atomic_release_time_slots(struct drm_atomic_state *state, } drm_dbg_atomic(mgr->dev, "[MST PORT:%p] TU %d -> 0\n", port, payload->time_slots); - if (payload->time_slots) { + if (!payload->delete) { drm_dp_mst_put_port_malloc(port); - payload->time_slots = 0; payload->pbn = 0; + payload->delete = true; } return 0; @@ -5234,7 +5234,7 @@ drm_dp_mst_duplicate_state(struct drm_private_obj *obj) list_for_each_entry(pos, &old_state->payloads, next) { /* Prune leftover freed timeslot allocations */ - if (!pos->time_slots) + if (pos->delete) continue; payload = kmemdup(pos, sizeof(*payload), GFP_KERNEL); @@ -5266,8 +5266,8 @@ static void drm_dp_mst_destroy_state(struct drm_private_obj *obj, int i; list_for_each_entry_safe(pos, tmp, &mst_state->payloads, next) { - /* We only keep references to ports with non-zero VCPIs */ - if (pos->time_slots) + /* We only keep references to ports with active payloads */ + if (!pos->delete) drm_dp_mst_put_port_malloc(pos->port); kfree(pos); } @@ -5395,7 +5395,7 @@ drm_dp_mst_atomic_check_payload_alloc_limits(struct drm_dp_mst_topology_mgr *mgr list_for_each_entry(payload, &mst_state->payloads, next) { /* Releasing payloads is always OK-even if the port is gone */ - if (!payload->time_slots) { + if (payload->delete) { drm_dbg_atomic(mgr->dev, "[MST PORT:%p] releases all time slots\n", payload->port); continue; diff --git a/include/drm/display/drm_dp_mst_helper.h b/include/drm/display/drm_dp_mst_helper.h index 690ebcabb51f..ecd130028337 100644 --- a/include/drm/display/drm_dp_mst_helper.h +++ b/include/drm/display/drm_dp_mst_helper.h @@ -555,8 +555,11 @@ struct drm_dp_mst_atomic_payload { int time_slots; /** @pbn: The payload bandwidth for this payload */ int pbn; + + /** @delete: Whether or not we intend to delete this payload during this atomic commit */ + bool delete : 1; /** @dsc_enabled: Whether or not this payload has DSC enabled */ - bool dsc_enabled; + bool dsc_enabled : 1; /** @next: The list node for this payload */ struct list_head next;