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, 550 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
new file mode 100644
index 000000000..6621aa245
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_atomic.c
@@ -0,0 +1,550 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * 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 (including the next
+ * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+/**
+ * DOC: atomic modeset support
+ *
+ * The functions here implement the state management and hardware programming
+ * dispatch required by the atomic modeset infrastructure.
+ * See intel_atomic_plane.c for the plane-specific atomic functionality.
+ */
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_fourcc.h>
+
+#include "i915_drv.h"
+#include "i915_reg.h"
+#include "intel_atomic.h"
+#include "intel_cdclk.h"
+#include "intel_display_types.h"
+#include "intel_global_state.h"
+#include "intel_hdcp.h"
+#include "intel_psr.h"
+#include "skl_universal_plane.h"
+
+/**
+ * intel_digital_connector_atomic_get_property - hook for connector->atomic_get_property.
+ * @connector: Connector to get the property for.
+ * @state: Connector state to retrieve the property from.
+ * @property: Property to retrieve.
+ * @val: Return value for the property.
+ *
+ * Returns the atomic property value for a digital connector.
+ */
+int intel_digital_connector_atomic_get_property(struct drm_connector *connector,
+						const struct drm_connector_state *state,
+						struct drm_property *property,
+						u64 *val)
+{
+	struct drm_device *dev = connector->dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_digital_connector_state *intel_conn_state =
+		to_intel_digital_connector_state(state);
+
+	if (property == dev_priv->display.properties.force_audio)
+		*val = intel_conn_state->force_audio;
+	else if (property == dev_priv->display.properties.broadcast_rgb)
+		*val = intel_conn_state->broadcast_rgb;
+	else {
+		drm_dbg_atomic(&dev_priv->drm,
+			       "Unknown property [PROP:%d:%s]\n",
+			       property->base.id, property->name);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ * intel_digital_connector_atomic_set_property - hook for connector->atomic_set_property.
+ * @connector: Connector to set the property for.
+ * @state: Connector state to set the property on.
+ * @property: Property to set.
+ * @val: New value for the property.
+ *
+ * Sets the atomic property value for a digital connector.
+ */
+int intel_digital_connector_atomic_set_property(struct drm_connector *connector,
+						struct drm_connector_state *state,
+						struct drm_property *property,
+						u64 val)
+{
+	struct drm_device *dev = connector->dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_digital_connector_state *intel_conn_state =
+		to_intel_digital_connector_state(state);
+
+	if (property == dev_priv->display.properties.force_audio) {
+		intel_conn_state->force_audio = val;
+		return 0;
+	}
+
+	if (property == dev_priv->display.properties.broadcast_rgb) {
+		intel_conn_state->broadcast_rgb = val;
+		return 0;
+	}
+
+	drm_dbg_atomic(&dev_priv->drm, "Unknown property [PROP:%d:%s]\n",
+		       property->base.id, property->name);
+	return -EINVAL;
+}
+
+int intel_digital_connector_atomic_check(struct drm_connector *conn,
+					 struct drm_atomic_state *state)
+{
+	struct drm_connector_state *new_state =
+		drm_atomic_get_new_connector_state(state, conn);
+	struct intel_digital_connector_state *new_conn_state =
+		to_intel_digital_connector_state(new_state);
+	struct drm_connector_state *old_state =
+		drm_atomic_get_old_connector_state(state, conn);
+	struct intel_digital_connector_state *old_conn_state =
+		to_intel_digital_connector_state(old_state);
+	struct drm_crtc_state *crtc_state;
+
+	intel_hdcp_atomic_check(conn, old_state, new_state);
+
+	if (!new_state->crtc)
+		return 0;
+
+	crtc_state = drm_atomic_get_new_crtc_state(state, new_state->crtc);
+
+	/*
+	 * These properties are handled by fastset, and might not end
+	 * up in a modeset.
+	 */
+	if (new_conn_state->force_audio != old_conn_state->force_audio ||
+	    new_conn_state->broadcast_rgb != old_conn_state->broadcast_rgb ||
+	    new_conn_state->base.colorspace != old_conn_state->base.colorspace ||
+	    new_conn_state->base.picture_aspect_ratio != old_conn_state->base.picture_aspect_ratio ||
+	    new_conn_state->base.content_type != old_conn_state->base.content_type ||
+	    new_conn_state->base.scaling_mode != old_conn_state->base.scaling_mode ||
+	    new_conn_state->base.privacy_screen_sw_state != old_conn_state->base.privacy_screen_sw_state ||
+	    !drm_connector_atomic_hdr_metadata_equal(old_state, new_state))
+		crtc_state->mode_changed = true;
+
+	return 0;
+}
+
+/**
+ * intel_digital_connector_duplicate_state - duplicate connector state
+ * @connector: digital connector
+ *
+ * Allocates and returns a copy of the connector state (both common and
+ * digital connector specific) for the specified connector.
+ *
+ * Returns: The newly allocated connector state, or NULL on failure.
+ */
+struct drm_connector_state *
+intel_digital_connector_duplicate_state(struct drm_connector *connector)
+{
+	struct intel_digital_connector_state *state;
+
+	state = kmemdup(connector->state, sizeof(*state), GFP_KERNEL);
+	if (!state)
+		return NULL;
+
+	__drm_atomic_helper_connector_duplicate_state(connector, &state->base);
+	return &state->base;
+}
+
+/**
+ * intel_connector_needs_modeset - check if connector needs a modeset
+ * @state: the atomic state corresponding to this modeset
+ * @connector: the connector
+ */
+bool
+intel_connector_needs_modeset(struct intel_atomic_state *state,
+			      struct drm_connector *connector)
+{
+	const struct drm_connector_state *old_conn_state, *new_conn_state;
+
+	old_conn_state = drm_atomic_get_old_connector_state(&state->base, connector);
+	new_conn_state = drm_atomic_get_new_connector_state(&state->base, connector);
+
+	return old_conn_state->crtc != new_conn_state->crtc ||
+	       (new_conn_state->crtc &&
+		drm_atomic_crtc_needs_modeset(drm_atomic_get_new_crtc_state(&state->base,
+									    new_conn_state->crtc)));
+}
+
+/**
+ * intel_any_crtc_needs_modeset - check if any CRTC needs a modeset
+ * @state: the atomic state corresponding to this modeset
+ *
+ * Returns true if any CRTC in @state needs a modeset.
+ */
+bool intel_any_crtc_needs_modeset(struct intel_atomic_state *state)
+{
+	struct intel_crtc *crtc;
+	struct intel_crtc_state *crtc_state;
+	int i;
+
+	for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
+		if (intel_crtc_needs_modeset(crtc_state))
+			return true;
+	}
+
+	return false;
+}
+
+struct intel_digital_connector_state *
+intel_atomic_get_digital_connector_state(struct intel_atomic_state *state,
+					 struct intel_connector *connector)
+{
+	struct drm_connector_state *conn_state;
+
+	conn_state = drm_atomic_get_connector_state(&state->base,
+						    &connector->base);
+	if (IS_ERR(conn_state))
+		return ERR_CAST(conn_state);
+
+	return to_intel_digital_connector_state(conn_state);
+}
+
+/**
+ * intel_crtc_duplicate_state - duplicate crtc state
+ * @crtc: drm crtc
+ *
+ * Allocates and returns a copy of the crtc state (both common and
+ * Intel-specific) for the specified crtc.
+ *
+ * Returns: The newly allocated crtc state, or NULL on failure.
+ */
+struct drm_crtc_state *
+intel_crtc_duplicate_state(struct drm_crtc *crtc)
+{
+	const struct intel_crtc_state *old_crtc_state = to_intel_crtc_state(crtc->state);
+	struct intel_crtc_state *crtc_state;
+
+	crtc_state = kmemdup(old_crtc_state, sizeof(*crtc_state), GFP_KERNEL);
+	if (!crtc_state)
+		return NULL;
+
+	__drm_atomic_helper_crtc_duplicate_state(crtc, &crtc_state->uapi);
+
+	/* copy color blobs */
+	if (crtc_state->hw.degamma_lut)
+		drm_property_blob_get(crtc_state->hw.degamma_lut);
+	if (crtc_state->hw.ctm)
+		drm_property_blob_get(crtc_state->hw.ctm);
+	if (crtc_state->hw.gamma_lut)
+		drm_property_blob_get(crtc_state->hw.gamma_lut);
+
+	if (crtc_state->pre_csc_lut)
+		drm_property_blob_get(crtc_state->pre_csc_lut);
+	if (crtc_state->post_csc_lut)
+		drm_property_blob_get(crtc_state->post_csc_lut);
+
+	crtc_state->update_pipe = false;
+	crtc_state->disable_lp_wm = false;
+	crtc_state->disable_cxsr = false;
+	crtc_state->update_wm_pre = false;
+	crtc_state->update_wm_post = false;
+	crtc_state->fifo_changed = false;
+	crtc_state->preload_luts = false;
+	crtc_state->inherited = false;
+	crtc_state->wm.need_postvbl_update = false;
+	crtc_state->do_async_flip = false;
+	crtc_state->fb_bits = 0;
+	crtc_state->update_planes = 0;
+	crtc_state->dsb = NULL;
+
+	return &crtc_state->uapi;
+}
+
+static void intel_crtc_put_color_blobs(struct intel_crtc_state *crtc_state)
+{
+	drm_property_blob_put(crtc_state->hw.degamma_lut);
+	drm_property_blob_put(crtc_state->hw.gamma_lut);
+	drm_property_blob_put(crtc_state->hw.ctm);
+
+	drm_property_blob_put(crtc_state->pre_csc_lut);
+	drm_property_blob_put(crtc_state->post_csc_lut);
+}
+
+void intel_crtc_free_hw_state(struct intel_crtc_state *crtc_state)
+{
+	intel_crtc_put_color_blobs(crtc_state);
+}
+
+/**
+ * intel_crtc_destroy_state - destroy crtc state
+ * @crtc: drm crtc
+ * @state: the state to destroy
+ *
+ * Destroys the crtc state (both common and Intel-specific) for the
+ * specified crtc.
+ */
+void
+intel_crtc_destroy_state(struct drm_crtc *crtc,
+			 struct drm_crtc_state *state)
+{
+	struct intel_crtc_state *crtc_state = to_intel_crtc_state(state);
+
+	drm_WARN_ON(crtc->dev, crtc_state->dsb);
+
+	__drm_atomic_helper_crtc_destroy_state(&crtc_state->uapi);
+	intel_crtc_free_hw_state(crtc_state);
+	kfree(crtc_state);
+}
+
+static void intel_atomic_setup_scaler(struct intel_crtc_scaler_state *scaler_state,
+				      int num_scalers_need, struct intel_crtc *intel_crtc,
+				      const char *name, int idx,
+				      struct intel_plane_state *plane_state,
+				      int *scaler_id)
+{
+	struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
+	int j;
+	u32 mode;
+
+	if (*scaler_id < 0) {
+		/* find a free scaler */
+		for (j = 0; j < intel_crtc->num_scalers; j++) {
+			if (scaler_state->scalers[j].in_use)
+				continue;
+
+			*scaler_id = j;
+			scaler_state->scalers[*scaler_id].in_use = 1;
+			break;
+		}
+	}
+
+	if (drm_WARN(&dev_priv->drm, *scaler_id < 0,
+		     "Cannot find scaler for %s:%d\n", name, idx))
+		return;
+
+	/* set scaler mode */
+	if (plane_state && plane_state->hw.fb &&
+	    plane_state->hw.fb->format->is_yuv &&
+	    plane_state->hw.fb->format->num_planes > 1) {
+		struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
+		if (DISPLAY_VER(dev_priv) == 9) {
+			mode = SKL_PS_SCALER_MODE_NV12;
+		} else if (icl_is_hdr_plane(dev_priv, plane->id)) {
+			/*
+			 * On gen11+'s HDR planes we only use the scaler for
+			 * scaling. They have a dedicated chroma upsampler, so
+			 * we don't need the scaler to upsample the UV plane.
+			 */
+			mode = PS_SCALER_MODE_NORMAL;
+		} else {
+			struct intel_plane *linked =
+				plane_state->planar_linked_plane;
+
+			mode = PS_SCALER_MODE_PLANAR;
+
+			if (linked)
+				mode |= PS_PLANE_Y_SEL(linked->id);
+		}
+	} else if (DISPLAY_VER(dev_priv) >= 10) {
+		mode = PS_SCALER_MODE_NORMAL;
+	} else if (num_scalers_need == 1 && intel_crtc->num_scalers > 1) {
+		/*
+		 * when only 1 scaler is in use on a pipe with 2 scalers
+		 * scaler 0 operates in high quality (HQ) mode.
+		 * In this case use scaler 0 to take advantage of HQ mode
+		 */
+		scaler_state->scalers[*scaler_id].in_use = 0;
+		*scaler_id = 0;
+		scaler_state->scalers[0].in_use = 1;
+		mode = SKL_PS_SCALER_MODE_HQ;
+	} else {
+		mode = SKL_PS_SCALER_MODE_DYN;
+	}
+
+	drm_dbg_kms(&dev_priv->drm, "Attached scaler id %u.%u to %s:%d\n",
+		    intel_crtc->pipe, *scaler_id, name, idx);
+	scaler_state->scalers[*scaler_id].mode = mode;
+}
+
+/**
+ * intel_atomic_setup_scalers() - setup scalers for crtc per staged requests
+ * @dev_priv: i915 device
+ * @intel_crtc: intel crtc
+ * @crtc_state: incoming crtc_state to validate and setup scalers
+ *
+ * This function sets up scalers based on staged scaling requests for
+ * a @crtc and its planes. It is called from crtc level check path. If request
+ * is a supportable request, it attaches scalers to requested planes and crtc.
+ *
+ * This function takes into account the current scaler(s) in use by any planes
+ * not being part of this atomic state
+ *
+ *  Returns:
+ *         0 - scalers were setup succesfully
+ *         error code - otherwise
+ */
+int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
+			       struct intel_crtc *intel_crtc,
+			       struct intel_crtc_state *crtc_state)
+{
+	struct drm_plane *plane = NULL;
+	struct intel_plane *intel_plane;
+	struct intel_plane_state *plane_state = NULL;
+	struct intel_crtc_scaler_state *scaler_state =
+		&crtc_state->scaler_state;
+	struct drm_atomic_state *drm_state = crtc_state->uapi.state;
+	struct intel_atomic_state *intel_state = to_intel_atomic_state(drm_state);
+	int num_scalers_need;
+	int i;
+
+	num_scalers_need = hweight32(scaler_state->scaler_users);
+
+	/*
+	 * High level flow:
+	 * - staged scaler requests are already in scaler_state->scaler_users
+	 * - check whether staged scaling requests can be supported
+	 * - add planes using scalers that aren't in current transaction
+	 * - assign scalers to requested users
+	 * - as part of plane commit, scalers will be committed
+	 *   (i.e., either attached or detached) to respective planes in hw
+	 * - as part of crtc_commit, scaler will be either attached or detached
+	 *   to crtc in hw
+	 */
+
+	/* fail if required scalers > available scalers */
+	if (num_scalers_need > intel_crtc->num_scalers){
+		drm_dbg_kms(&dev_priv->drm,
+			    "Too many scaling requests %d > %d\n",
+			    num_scalers_need, intel_crtc->num_scalers);
+		return -EINVAL;
+	}
+
+	/* walkthrough scaler_users bits and start assigning scalers */
+	for (i = 0; i < sizeof(scaler_state->scaler_users) * 8; i++) {
+		int *scaler_id;
+		const char *name;
+		int idx;
+
+		/* skip if scaler not required */
+		if (!(scaler_state->scaler_users & (1 << i)))
+			continue;
+
+		if (i == SKL_CRTC_INDEX) {
+			name = "CRTC";
+			idx = intel_crtc->base.base.id;
+
+			/* panel fitter case: assign as a crtc scaler */
+			scaler_id = &scaler_state->scaler_id;
+		} else {
+			name = "PLANE";
+
+			/* plane scaler case: assign as a plane scaler */
+			/* find the plane that set the bit as scaler_user */
+			plane = drm_state->planes[i].ptr;
+
+			/*
+			 * to enable/disable hq mode, add planes that are using scaler
+			 * into this transaction
+			 */
+			if (!plane) {
+				struct drm_plane_state *state;
+
+				/*
+				 * GLK+ scalers don't have a HQ mode so it
+				 * isn't necessary to change between HQ and dyn mode
+				 * on those platforms.
+				 */
+				if (DISPLAY_VER(dev_priv) >= 10)
+					continue;
+
+				plane = drm_plane_from_index(&dev_priv->drm, i);
+				state = drm_atomic_get_plane_state(drm_state, plane);
+				if (IS_ERR(state)) {
+					drm_dbg_kms(&dev_priv->drm,
+						    "Failed to add [PLANE:%d] to drm_state\n",
+						    plane->base.id);
+					return PTR_ERR(state);
+				}
+			}
+
+			intel_plane = to_intel_plane(plane);
+			idx = plane->base.id;
+
+			/* plane on different crtc cannot be a scaler user of this crtc */
+			if (drm_WARN_ON(&dev_priv->drm,
+					intel_plane->pipe != intel_crtc->pipe))
+				continue;
+
+			plane_state = intel_atomic_get_new_plane_state(intel_state,
+								       intel_plane);
+			scaler_id = &plane_state->scaler_id;
+		}
+
+		intel_atomic_setup_scaler(scaler_state, num_scalers_need,
+					  intel_crtc, name, idx,
+					  plane_state, scaler_id);
+	}
+
+	return 0;
+}
+
+struct drm_atomic_state *
+intel_atomic_state_alloc(struct drm_device *dev)
+{
+	struct intel_atomic_state *state = kzalloc(sizeof(*state), GFP_KERNEL);
+
+	if (!state || drm_atomic_state_init(dev, &state->base) < 0) {
+		kfree(state);
+		return NULL;
+	}
+
+	return &state->base;
+}
+
+void intel_atomic_state_free(struct drm_atomic_state *_state)
+{
+	struct intel_atomic_state *state = to_intel_atomic_state(_state);
+
+	drm_atomic_state_default_release(&state->base);
+	kfree(state->global_objs);
+
+	i915_sw_fence_fini(&state->commit_ready);
+
+	kfree(state);
+}
+
+void intel_atomic_state_clear(struct drm_atomic_state *s)
+{
+	struct intel_atomic_state *state = to_intel_atomic_state(s);
+
+	drm_atomic_state_default_clear(&state->base);
+	intel_atomic_clear_global_state(state);
+
+	state->dpll_set = state->modeset = false;
+}
+
+struct intel_crtc_state *
+intel_atomic_get_crtc_state(struct drm_atomic_state *state,
+			    struct intel_crtc *crtc)
+{
+	struct drm_crtc_state *crtc_state;
+	crtc_state = drm_atomic_get_crtc_state(state, &crtc->base);
+	if (IS_ERR(crtc_state))
+		return ERR_CAST(crtc_state);
+
+	return to_intel_crtc_state(crtc_state);
+}