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From: Lyude Paul <lyude@redhat.com>
To: dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org,
	amd-gfx@lists.freedesktop.org
Cc: Thomas Zimmermann <tzimmermann@suse.de>,
	Jani Nikula <jani.nikula@intel.com>,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	open list <linux-kernel@vger.kernel.org>,
	Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>,
	David Airlie <airlied@linux.ie>, Fangzhi Zuo <Jerry.Zuo@amd.com>,
	Wayne Lin <Wayne.Lin@amd.com>, Sean Paul <sean@poorly.run>
Subject: [RESEND RFC 07/18] drm/display/dp_mst: Add helper for finding payloads in atomic MST state
Date: Tue,  7 Jun 2022 15:29:22 -0400	[thread overview]
Message-ID: <20220607192933.1333228-8-lyude@redhat.com> (raw)
In-Reply-To: <20220607192933.1333228-1-lyude@redhat.com>

We already open-code this quite often, and will be iterating through
payloads even more once we've moved all of the payload tracking into the
atomic state. So, let's add a helper for doing this.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: Wayne Lin <Wayne.Lin@amd.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Fangzhi Zuo <Jerry.Zuo@amd.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Sean Paul <sean@poorly.run>
---
 drivers/gpu/drm/display/drm_dp_mst_topology.c | 109 ++++++++----------
 1 file changed, 45 insertions(+), 64 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
index ec52f91b1f0e..0bc2c7a90c37 100644
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -1737,6 +1737,19 @@ drm_dp_mst_dump_port_topology_history(struct drm_dp_mst_port *port) {}
 #define save_port_topology_ref(port, type)
 #endif
 
+static struct drm_dp_mst_atomic_payload *
+drm_atomic_get_mst_payload_state(struct drm_dp_mst_topology_state *state,
+				 struct drm_dp_mst_port *port)
+{
+	struct drm_dp_mst_atomic_payload *payload;
+
+	list_for_each_entry(payload, &state->payloads, next)
+		if (payload->port == port)
+			return payload;
+
+	return NULL;
+}
+
 static void drm_dp_destroy_mst_branch_device(struct kref *kref)
 {
 	struct drm_dp_mst_branch *mstb =
@@ -4381,39 +4394,31 @@ int drm_dp_atomic_find_time_slots(struct drm_atomic_state *state,
 				  int pbn_div)
 {
 	struct drm_dp_mst_topology_state *topology_state;
-	struct drm_dp_mst_atomic_payload *pos, *payload = NULL;
-	int prev_slots, prev_bw, req_slots;
+	struct drm_dp_mst_atomic_payload *payload = NULL;
+	int prev_slots = 0, prev_bw = 0, req_slots;
 
 	topology_state = drm_atomic_get_mst_topology_state(state, mgr);
 	if (IS_ERR(topology_state))
 		return PTR_ERR(topology_state);
 
 	/* Find the current allocation for this port, if any */
-	list_for_each_entry(pos, &topology_state->payloads, next) {
-		if (pos->port == port) {
-			payload = pos;
-			prev_slots = payload->time_slots;
-			prev_bw = payload->pbn;
-
-			/*
-			 * This should never happen, unless the driver tries
-			 * releasing and allocating the same timeslot allocation,
-			 * which is an error
-			 */
-			if (WARN_ON(!prev_slots)) {
-				drm_err(mgr->dev,
-					"cannot allocate and release time slots on [MST PORT:%p] in the same state\n",
-					port);
-				return -EINVAL;
-			}
+	payload = drm_atomic_get_mst_payload_state(topology_state, port);
+	if (payload) {
+		prev_slots = payload->time_slots;
+		prev_bw = payload->pbn;
 
-			break;
+		/*
+		 * This should never happen, unless the driver tries
+		 * releasing and allocating the same timeslot allocation,
+		 * which is an error
+		 */
+		if (WARN_ON(!prev_slots)) {
+			drm_err(mgr->dev,
+				"cannot allocate and release time slots on [MST PORT:%p] in the same state\n",
+				port);
+			return -EINVAL;
 		}
 	}
-	if (!payload) {
-		prev_slots = 0;
-		prev_bw = 0;
-	}
 
 	if (pbn_div <= 0)
 		pbn_div = mgr->pbn_div;
@@ -4474,30 +4479,24 @@ int drm_dp_atomic_release_time_slots(struct drm_atomic_state *state,
 				     struct drm_dp_mst_port *port)
 {
 	struct drm_dp_mst_topology_state *topology_state;
-	struct drm_dp_mst_atomic_payload *pos;
-	bool found = false;
+	struct drm_dp_mst_atomic_payload *payload;
 
 	topology_state = drm_atomic_get_mst_topology_state(state, mgr);
 	if (IS_ERR(topology_state))
 		return PTR_ERR(topology_state);
 
-	list_for_each_entry(pos, &topology_state->payloads, next) {
-		if (pos->port == port) {
-			found = true;
-			break;
-		}
-	}
-	if (WARN_ON(!found)) {
+	payload = drm_atomic_get_mst_payload_state(topology_state, port);
+	if (WARN_ON(!payload)) {
 		drm_err(mgr->dev, "No payload for [MST PORT:%p] found in mst state %p\n",
 			port, &topology_state->base);
 		return -EINVAL;
 	}
 
-	drm_dbg_atomic(mgr->dev, "[MST PORT:%p] TU %d -> 0\n", port, pos->time_slots);
-	if (pos->time_slots) {
+	drm_dbg_atomic(mgr->dev, "[MST PORT:%p] TU %d -> 0\n", port, payload->time_slots);
+	if (payload->time_slots) {
 		drm_dp_mst_put_port_malloc(port);
-		pos->time_slots = 0;
-		pos->pbn = 0;
+		payload->time_slots = 0;
+		payload->pbn = 0;
 	}
 
 	return 0;
@@ -5194,18 +5193,8 @@ drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port,
 		return 0;
 
 	if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) {
-		bool found = false;
-
-		list_for_each_entry(payload, &state->payloads, next) {
-			if (payload->port != port)
-				continue;
-			if (!payload->pbn)
-				return 0;
-
-			found = true;
-			break;
-		}
-		if (!found)
+		payload = drm_atomic_get_mst_payload_state(state, port);
+		if (!payload)
 			return 0;
 
 		/*
@@ -5360,34 +5349,26 @@ int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
 				 bool enable)
 {
 	struct drm_dp_mst_topology_state *mst_state;
-	struct drm_dp_mst_atomic_payload *pos;
-	bool found = false;
+	struct drm_dp_mst_atomic_payload *payload;
 	int time_slots = 0;
 
 	mst_state = drm_atomic_get_mst_topology_state(state, port->mgr);
-
 	if (IS_ERR(mst_state))
 		return PTR_ERR(mst_state);
 
-	list_for_each_entry(pos, &mst_state->payloads, next) {
-		if (pos->port == port) {
-			found = true;
-			break;
-		}
-	}
-
-	if (!found) {
+	payload = drm_atomic_get_mst_payload_state(mst_state, port);
+	if (!payload) {
 		drm_dbg_atomic(state->dev,
 			       "[MST PORT:%p] Couldn't find payload in mst state %p\n",
 			       port, mst_state);
 		return -EINVAL;
 	}
 
-	if (pos->dsc_enabled == enable) {
+	if (payload->dsc_enabled == enable) {
 		drm_dbg_atomic(state->dev,
 			       "[MST PORT:%p] DSC flag is already set to %d, returning %d time slots\n",
-			       port, enable, pos->time_slots);
-		time_slots = pos->time_slots;
+			       port, enable, payload->time_slots);
+		time_slots = payload->time_slots;
 	}
 
 	if (enable) {
@@ -5399,7 +5380,7 @@ int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
 			return -EINVAL;
 	}
 
-	pos->dsc_enabled = enable;
+	payload->dsc_enabled = enable;
 
 	return time_slots;
 }
-- 
2.35.3


  parent reply	other threads:[~2022-06-07 19:34 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-07 19:29 [RESEND RFC 00/18] drm/display/dp_mst: Drop Radeon MST support, make MST atomic-only Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 01/18] drm/amdgpu/dc/mst: Rename dp_mst_stream_allocation(_table) Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 02/18] drm/amdgpu/dm/mst: Rename get_payload_table() Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 03/18] drm/display/dp_mst: Rename drm_dp_mst_vcpi_allocation Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 04/18] drm/display/dp_mst: Call them time slots, not VCPI slots Lyude Paul
2022-06-15  4:28   ` Lin, Wayne
2022-08-02 21:29     ` Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 05/18] drm/display/dp_mst: Fix confusing docs for drm_dp_atomic_release_time_slots() Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 06/18] drm/display/dp_mst: Add some missing kdocs for atomic MST structs Lyude Paul
2022-06-15  4:43   ` Lin, Wayne
2022-08-08 23:07     ` Lyude Paul
2022-06-07 19:29 ` Lyude Paul [this message]
2022-06-29 13:22   ` [RESEND RFC 07/18] drm/display/dp_mst: Add helper for finding payloads in atomic MST state Jani Nikula
2022-06-07 19:29 ` [RESEND RFC 08/18] drm/display/dp_mst: Add nonblocking helpers for DP MST Lyude Paul
2022-06-29 13:30   ` Jani Nikula
2022-06-07 19:29 ` [RESEND RFC 09/18] drm/display/dp_mst: Don't open code modeset checks for releasing time slots Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 10/18] drm/display/dp_mst: Fix modeset tracking in drm_dp_atomic_release_vcpi_slots() Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 11/18] drm/nouveau/kms: Cache DP encoders in nouveau_connector Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 12/18] drm/nouveau/kms: Pull mst state in for all modesets Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 13/18] drm/display/dp_mst: Add helpers for serializing SST <-> MST transitions Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 14/18] drm/display/dp_mst: Drop all ports from topology on CSNs before queueing link address work Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 15/18] drm/display/dp_mst: Skip releasing payloads if last connected port isn't connected Lyude Paul
2022-07-05  8:45   ` Lin, Wayne
2022-08-02 22:12     ` Lyude Paul
2022-08-10  3:28       ` Lin, Wayne
2022-08-10 22:13         ` Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 16/18] drm/display/dp_mst: Maintain time slot allocations when deleting payloads Lyude Paul
2022-06-07 19:29 ` [RESEND RFC 17/18] drm/radeon: Drop legacy MST support Lyude Paul
2022-06-07 20:48   ` Alex Deucher
2022-06-07 19:29 ` [RESEND RFC 18/18] drm/display/dp_mst: Move all payload info into the atomic state Lyude Paul
2022-07-05  9:10   ` Lin, Wayne
2022-07-06 21:57     ` Lyude Paul
2022-08-03 20:27     ` Lyude Paul
2022-08-08 10:02       ` Lin, Wayne
2022-08-08 22:53         ` Lyude Paul
2022-06-29 13:33 ` [RESEND RFC 00/18] drm/display/dp_mst: Drop Radeon MST support, make MST atomic-only Jani Nikula
2022-07-28 22:21 ` Lyude Paul

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