Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 473 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
new file mode 100644
index 000000000..22125daf9
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
@@ -0,0 +1,473 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright 2022 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+#include <drm/drm_vblank.h>
+#include <drm/drm_atomic_helper.h>
+
+#include "dc.h"
+#include "amdgpu.h"
+#include "amdgpu_dm_psr.h"
+#include "amdgpu_dm_crtc.h"
+#include "amdgpu_dm_plane.h"
+#include "amdgpu_dm_trace.h"
+#include "amdgpu_dm_debugfs.h"
+
+void dm_crtc_handle_vblank(struct amdgpu_crtc *acrtc)
+{
+	struct drm_crtc *crtc = &acrtc->base;
+	struct drm_device *dev = crtc->dev;
+	unsigned long flags;
+
+	drm_crtc_handle_vblank(crtc);
+
+	spin_lock_irqsave(&dev->event_lock, flags);
+
+	/* Send completion event for cursor-only commits */
+	if (acrtc->event && acrtc->pflip_status != AMDGPU_FLIP_SUBMITTED) {
+		drm_crtc_send_vblank_event(crtc, acrtc->event);
+		drm_crtc_vblank_put(crtc);
+		acrtc->event = NULL;
+	}
+
+	spin_unlock_irqrestore(&dev->event_lock, flags);
+}
+
+bool modeset_required(struct drm_crtc_state *crtc_state,
+			     struct dc_stream_state *new_stream,
+			     struct dc_stream_state *old_stream)
+{
+	return crtc_state->active && drm_atomic_crtc_needs_modeset(crtc_state);
+}
+
+bool amdgpu_dm_vrr_active_irq(struct amdgpu_crtc *acrtc)
+
+{
+	return acrtc->dm_irq_params.freesync_config.state ==
+		       VRR_STATE_ACTIVE_VARIABLE ||
+	       acrtc->dm_irq_params.freesync_config.state ==
+		       VRR_STATE_ACTIVE_FIXED;
+}
+
+int dm_set_vupdate_irq(struct drm_crtc *crtc, bool enable)
+{
+	enum dc_irq_source irq_source;
+	struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);
+	struct amdgpu_device *adev = drm_to_adev(crtc->dev);
+	int rc;
+
+	irq_source = IRQ_TYPE_VUPDATE + acrtc->otg_inst;
+
+	rc = dc_interrupt_set(adev->dm.dc, irq_source, enable) ? 0 : -EBUSY;
+
+	DRM_DEBUG_VBL("crtc %d - vupdate irq %sabling: r=%d\n",
+		      acrtc->crtc_id, enable ? "en" : "dis", rc);
+	return rc;
+}
+
+bool amdgpu_dm_vrr_active(struct dm_crtc_state *dm_state)
+{
+	return dm_state->freesync_config.state == VRR_STATE_ACTIVE_VARIABLE ||
+	       dm_state->freesync_config.state == VRR_STATE_ACTIVE_FIXED;
+}
+
+static void vblank_control_worker(struct work_struct *work)
+{
+	struct vblank_control_work *vblank_work =
+		container_of(work, struct vblank_control_work, work);
+	struct amdgpu_display_manager *dm = vblank_work->dm;
+
+	mutex_lock(&dm->dc_lock);
+
+	if (vblank_work->enable)
+		dm->active_vblank_irq_count++;
+	else if (dm->active_vblank_irq_count)
+		dm->active_vblank_irq_count--;
+
+	dc_allow_idle_optimizations(
+		dm->dc, dm->active_vblank_irq_count == 0 ? true : false);
+
+	DRM_DEBUG_KMS("Allow idle optimizations (MALL): %d\n", dm->active_vblank_irq_count == 0);
+
+	/*
+	 * Control PSR based on vblank requirements from OS
+	 *
+	 * If panel supports PSR SU, there's no need to disable PSR when OS is
+	 * submitting fast atomic commits (we infer this by whether the OS
+	 * requests vblank events). Fast atomic commits will simply trigger a
+	 * full-frame-update (FFU); a specific case of selective-update (SU)
+	 * where the SU region is the full hactive*vactive region. See
+	 * fill_dc_dirty_rects().
+	 */
+	if (vblank_work->stream && vblank_work->stream->link) {
+		if (vblank_work->enable) {
+			if (vblank_work->stream->link->psr_settings.psr_version < DC_PSR_VERSION_SU_1 &&
+			    vblank_work->stream->link->psr_settings.psr_allow_active)
+				amdgpu_dm_psr_disable(vblank_work->stream);
+		} else if (vblank_work->stream->link->psr_settings.psr_feature_enabled &&
+			   !vblank_work->stream->link->psr_settings.psr_allow_active &&
+#ifdef CONFIG_DRM_AMD_SECURE_DISPLAY
+			   !amdgpu_dm_crc_window_is_activated(&vblank_work->acrtc->base) &&
+#endif
+			   vblank_work->acrtc->dm_irq_params.allow_psr_entry) {
+			amdgpu_dm_psr_enable(vblank_work->stream);
+		}
+	}
+
+	mutex_unlock(&dm->dc_lock);
+
+	dc_stream_release(vblank_work->stream);
+
+	kfree(vblank_work);
+}
+
+static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable)
+{
+	enum dc_irq_source irq_source;
+	struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);
+	struct amdgpu_device *adev = drm_to_adev(crtc->dev);
+	struct dm_crtc_state *acrtc_state = to_dm_crtc_state(crtc->state);
+	struct amdgpu_display_manager *dm = &adev->dm;
+	struct vblank_control_work *work;
+	int rc = 0;
+
+	if (enable) {
+		/* vblank irq on -> Only need vupdate irq in vrr mode */
+		if (amdgpu_dm_vrr_active(acrtc_state))
+			rc = dm_set_vupdate_irq(crtc, true);
+	} else {
+		/* vblank irq off -> vupdate irq off */
+		rc = dm_set_vupdate_irq(crtc, false);
+	}
+
+	if (rc)
+		return rc;
+
+	irq_source = IRQ_TYPE_VBLANK + acrtc->otg_inst;
+
+	if (!dc_interrupt_set(adev->dm.dc, irq_source, enable))
+		return -EBUSY;
+
+	if (amdgpu_in_reset(adev))
+		return 0;
+
+	if (dm->vblank_control_workqueue) {
+		work = kzalloc(sizeof(*work), GFP_ATOMIC);
+		if (!work)
+			return -ENOMEM;
+
+		INIT_WORK(&work->work, vblank_control_worker);
+		work->dm = dm;
+		work->acrtc = acrtc;
+		work->enable = enable;
+
+		if (acrtc_state->stream) {
+			dc_stream_retain(acrtc_state->stream);
+			work->stream = acrtc_state->stream;
+		}
+
+		queue_work(dm->vblank_control_workqueue, &work->work);
+	}
+
+	return 0;
+}
+
+int dm_enable_vblank(struct drm_crtc *crtc)
+{
+	return dm_set_vblank(crtc, true);
+}
+
+void dm_disable_vblank(struct drm_crtc *crtc)
+{
+	dm_set_vblank(crtc, false);
+}
+
+static void dm_crtc_destroy_state(struct drm_crtc *crtc,
+				  struct drm_crtc_state *state)
+{
+	struct dm_crtc_state *cur = to_dm_crtc_state(state);
+
+	/* TODO Destroy dc_stream objects are stream object is flattened */
+	if (cur->stream)
+		dc_stream_release(cur->stream);
+
+
+	__drm_atomic_helper_crtc_destroy_state(state);
+
+
+	kfree(state);
+}
+
+static struct drm_crtc_state *dm_crtc_duplicate_state(struct drm_crtc *crtc)
+{
+	struct dm_crtc_state *state, *cur;
+
+	cur = to_dm_crtc_state(crtc->state);
+
+	if (WARN_ON(!crtc->state))
+		return NULL;
+
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (!state)
+		return NULL;
+
+	__drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
+
+	if (cur->stream) {
+		state->stream = cur->stream;
+		dc_stream_retain(state->stream);
+	}
+
+	state->active_planes = cur->active_planes;
+	state->vrr_infopacket = cur->vrr_infopacket;
+	state->abm_level = cur->abm_level;
+	state->vrr_supported = cur->vrr_supported;
+	state->freesync_config = cur->freesync_config;
+	state->cm_has_degamma = cur->cm_has_degamma;
+	state->cm_is_degamma_srgb = cur->cm_is_degamma_srgb;
+	state->crc_skip_count = cur->crc_skip_count;
+	state->mpo_requested = cur->mpo_requested;
+	/* TODO Duplicate dc_stream after objects are stream object is flattened */
+
+	return &state->base;
+}
+
+static void amdgpu_dm_crtc_destroy(struct drm_crtc *crtc)
+{
+	drm_crtc_cleanup(crtc);
+	kfree(crtc);
+}
+
+static void dm_crtc_reset_state(struct drm_crtc *crtc)
+{
+	struct dm_crtc_state *state;
+
+	if (crtc->state)
+		dm_crtc_destroy_state(crtc, crtc->state);
+
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (WARN_ON(!state))
+		return;
+
+	__drm_atomic_helper_crtc_reset(crtc, &state->base);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int amdgpu_dm_crtc_late_register(struct drm_crtc *crtc)
+{
+	crtc_debugfs_init(crtc);
+
+	return 0;
+}
+#endif
+
+/* Implemented only the options currently available for the driver */
+static const struct drm_crtc_funcs amdgpu_dm_crtc_funcs = {
+	.reset = dm_crtc_reset_state,
+	.destroy = amdgpu_dm_crtc_destroy,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.atomic_duplicate_state = dm_crtc_duplicate_state,
+	.atomic_destroy_state = dm_crtc_destroy_state,
+	.set_crc_source = amdgpu_dm_crtc_set_crc_source,
+	.verify_crc_source = amdgpu_dm_crtc_verify_crc_source,
+	.get_crc_sources = amdgpu_dm_crtc_get_crc_sources,
+	.get_vblank_counter = amdgpu_get_vblank_counter_kms,
+	.enable_vblank = dm_enable_vblank,
+	.disable_vblank = dm_disable_vblank,
+	.get_vblank_timestamp = drm_crtc_vblank_helper_get_vblank_timestamp,
+#if defined(CONFIG_DEBUG_FS)
+	.late_register = amdgpu_dm_crtc_late_register,
+#endif
+};
+
+static void dm_crtc_helper_disable(struct drm_crtc *crtc)
+{
+}
+
+static int count_crtc_active_planes(struct drm_crtc_state *new_crtc_state)
+{
+	struct drm_atomic_state *state = new_crtc_state->state;
+	struct drm_plane *plane;
+	int num_active = 0;
+
+	drm_for_each_plane_mask(plane, state->dev, new_crtc_state->plane_mask) {
+		struct drm_plane_state *new_plane_state;
+
+		/* Cursor planes are "fake". */
+		if (plane->type == DRM_PLANE_TYPE_CURSOR)
+			continue;
+
+		new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+
+		if (!new_plane_state) {
+			/*
+			 * The plane is enable on the CRTC and hasn't changed
+			 * state. This means that it previously passed
+			 * validation and is therefore enabled.
+			 */
+			num_active += 1;
+			continue;
+		}
+
+		/* We need a framebuffer to be considered enabled. */
+		num_active += (new_plane_state->fb != NULL);
+	}
+
+	return num_active;
+}
+
+static void dm_update_crtc_active_planes(struct drm_crtc *crtc,
+					 struct drm_crtc_state *new_crtc_state)
+{
+	struct dm_crtc_state *dm_new_crtc_state =
+		to_dm_crtc_state(new_crtc_state);
+
+	dm_new_crtc_state->active_planes = 0;
+
+	if (!dm_new_crtc_state->stream)
+		return;
+
+	dm_new_crtc_state->active_planes =
+		count_crtc_active_planes(new_crtc_state);
+}
+
+static bool dm_crtc_helper_mode_fixup(struct drm_crtc *crtc,
+				      const struct drm_display_mode *mode,
+				      struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+static int dm_crtc_helper_atomic_check(struct drm_crtc *crtc,
+				      struct drm_atomic_state *state)
+{
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+										crtc);
+	struct amdgpu_device *adev = drm_to_adev(crtc->dev);
+	struct dc *dc = adev->dm.dc;
+	struct dm_crtc_state *dm_crtc_state = to_dm_crtc_state(crtc_state);
+	int ret = -EINVAL;
+
+	trace_amdgpu_dm_crtc_atomic_check(crtc_state);
+
+	dm_update_crtc_active_planes(crtc, crtc_state);
+
+	if (WARN_ON(unlikely(!dm_crtc_state->stream &&
+			modeset_required(crtc_state, NULL, dm_crtc_state->stream)))) {
+		return ret;
+	}
+
+	/*
+	 * We require the primary plane to be enabled whenever the CRTC is, otherwise
+	 * drm_mode_cursor_universal may end up trying to enable the cursor plane while all other
+	 * planes are disabled, which is not supported by the hardware. And there is legacy
+	 * userspace which stops using the HW cursor altogether in response to the resulting EINVAL.
+	 */
+	if (crtc_state->enable &&
+		!(crtc_state->plane_mask & drm_plane_mask(crtc->primary))) {
+		DRM_DEBUG_ATOMIC("Can't enable a CRTC without enabling the primary plane\n");
+		return -EINVAL;
+	}
+
+	/* In some use cases, like reset, no stream is attached */
+	if (!dm_crtc_state->stream)
+		return 0;
+
+	if (dc_validate_stream(dc, dm_crtc_state->stream) == DC_OK)
+		return 0;
+
+	DRM_DEBUG_ATOMIC("Failed DC stream validation\n");
+	return ret;
+}
+
+static const struct drm_crtc_helper_funcs amdgpu_dm_crtc_helper_funcs = {
+	.disable = dm_crtc_helper_disable,
+	.atomic_check = dm_crtc_helper_atomic_check,
+	.mode_fixup = dm_crtc_helper_mode_fixup,
+	.get_scanout_position = amdgpu_crtc_get_scanout_position,
+};
+
+int amdgpu_dm_crtc_init(struct amdgpu_display_manager *dm,
+			       struct drm_plane *plane,
+			       uint32_t crtc_index)
+{
+	struct amdgpu_crtc *acrtc = NULL;
+	struct drm_plane *cursor_plane;
+	bool is_dcn;
+	int res = -ENOMEM;
+
+	cursor_plane = kzalloc(sizeof(*cursor_plane), GFP_KERNEL);
+	if (!cursor_plane)
+		goto fail;
+
+	cursor_plane->type = DRM_PLANE_TYPE_CURSOR;
+	res = amdgpu_dm_plane_init(dm, cursor_plane, 0, NULL);
+
+	acrtc = kzalloc(sizeof(struct amdgpu_crtc), GFP_KERNEL);
+	if (!acrtc)
+		goto fail;
+
+	res = drm_crtc_init_with_planes(
+			dm->ddev,
+			&acrtc->base,
+			plane,
+			cursor_plane,
+			&amdgpu_dm_crtc_funcs, NULL);
+
+	if (res)
+		goto fail;
+
+	drm_crtc_helper_add(&acrtc->base, &amdgpu_dm_crtc_helper_funcs);
+
+	/* Create (reset) the plane state */
+	if (acrtc->base.funcs->reset)
+		acrtc->base.funcs->reset(&acrtc->base);
+
+	acrtc->max_cursor_width = dm->adev->dm.dc->caps.max_cursor_size;
+	acrtc->max_cursor_height = dm->adev->dm.dc->caps.max_cursor_size;
+
+	acrtc->crtc_id = crtc_index;
+	acrtc->base.enabled = false;
+	acrtc->otg_inst = -1;
+
+	dm->adev->mode_info.crtcs[crtc_index] = acrtc;
+
+	/* Don't enable DRM CRTC degamma property for DCE since it doesn't
+	 * support programmable degamma anywhere.
+	 */
+	is_dcn = dm->adev->dm.dc->caps.color.dpp.dcn_arch;
+	drm_crtc_enable_color_mgmt(&acrtc->base, is_dcn ? MAX_COLOR_LUT_ENTRIES : 0,
+				   true, MAX_COLOR_LUT_ENTRIES);
+
+	drm_mode_crtc_set_gamma_size(&acrtc->base, MAX_COLOR_LEGACY_LUT_ENTRIES);
+
+	return 0;
+
+fail:
+	kfree(acrtc);
+	kfree(cursor_plane);
+	return res;
+}
+