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, 408 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
new file mode 100644
index 000000000..56a306354
--- /dev/null
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
@@ -0,0 +1,408 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ */
+
+#include <drm/drm_fourcc.h>
+#include <drm/drm_util.h>
+
+#include "mdp5_kms.h"
+#include "mdp5_smp.h"
+
+
+struct mdp5_smp {
+	struct drm_device *dev;
+
+	uint8_t reserved[MAX_CLIENTS]; /* fixed MMBs allocation per client */
+
+	int blk_cnt;
+	int blk_size;
+
+	/* register cache */
+	u32 alloc_w[22];
+	u32 alloc_r[22];
+	u32 pipe_reqprio_fifo_wm0[SSPP_MAX];
+	u32 pipe_reqprio_fifo_wm1[SSPP_MAX];
+	u32 pipe_reqprio_fifo_wm2[SSPP_MAX];
+};
+
+static inline
+struct mdp5_kms *get_kms(struct mdp5_smp *smp)
+{
+	struct msm_drm_private *priv = smp->dev->dev_private;
+
+	return to_mdp5_kms(to_mdp_kms(priv->kms));
+}
+
+static inline u32 pipe2client(enum mdp5_pipe pipe, int plane)
+{
+#define CID_UNUSED	0
+
+	if (WARN_ON(plane >= pipe2nclients(pipe)))
+		return CID_UNUSED;
+
+	/*
+	 * Note on SMP clients:
+	 * For ViG pipes, fetch Y/Cr/Cb-components clients are always
+	 * consecutive, and in that order.
+	 *
+	 * e.g.:
+	 * if mdp5_cfg->smp.clients[SSPP_VIG0] = N,
+	 *	Y  plane's client ID is N
+	 *	Cr plane's client ID is N + 1
+	 *	Cb plane's client ID is N + 2
+	 */
+
+	return mdp5_cfg->smp.clients[pipe] + plane;
+}
+
+/* allocate blocks for the specified request: */
+static int smp_request_block(struct mdp5_smp *smp,
+		struct mdp5_smp_state *state,
+		u32 cid, int nblks)
+{
+	void *cs = state->client_state[cid];
+	int i, avail, cnt = smp->blk_cnt;
+	uint8_t reserved;
+
+	/* we shouldn't be requesting blocks for an in-use client: */
+	WARN_ON(!bitmap_empty(cs, cnt));
+
+	reserved = smp->reserved[cid];
+
+	if (reserved) {
+		nblks = max(0, nblks - reserved);
+		DBG("%d MMBs allocated (%d reserved)", nblks, reserved);
+	}
+
+	avail = cnt - bitmap_weight(state->state, cnt);
+	if (nblks > avail) {
+		DRM_DEV_ERROR(smp->dev->dev, "out of blks (req=%d > avail=%d)\n",
+				nblks, avail);
+		return -ENOSPC;
+	}
+
+	for (i = 0; i < nblks; i++) {
+		int blk = find_first_zero_bit(state->state, cnt);
+		set_bit(blk, cs);
+		set_bit(blk, state->state);
+	}
+
+	return 0;
+}
+
+static void set_fifo_thresholds(struct mdp5_smp *smp,
+		enum mdp5_pipe pipe, int nblks)
+{
+	u32 smp_entries_per_blk = smp->blk_size / (128 / BITS_PER_BYTE);
+	u32 val;
+
+	/* 1/4 of SMP pool that is being fetched */
+	val = (nblks * smp_entries_per_blk) / 4;
+
+	smp->pipe_reqprio_fifo_wm0[pipe] = val * 1;
+	smp->pipe_reqprio_fifo_wm1[pipe] = val * 2;
+	smp->pipe_reqprio_fifo_wm2[pipe] = val * 3;
+}
+
+/*
+ * NOTE: looks like if horizontal decimation is used (if we supported that)
+ * then the width used to calculate SMP block requirements is the post-
+ * decimated width.  Ie. SMP buffering sits downstream of decimation (which
+ * presumably happens during the dma from scanout buffer).
+ */
+uint32_t mdp5_smp_calculate(struct mdp5_smp *smp,
+		const struct mdp_format *format,
+		u32 width, bool hdecim)
+{
+	const struct drm_format_info *info = drm_format_info(format->base.pixel_format);
+	struct mdp5_kms *mdp5_kms = get_kms(smp);
+	int rev = mdp5_cfg_get_hw_rev(mdp5_kms->cfg);
+	int i, hsub, nplanes, nlines;
+	uint32_t blkcfg = 0;
+
+	nplanes = info->num_planes;
+	hsub = info->hsub;
+
+	/* different if BWC (compressed framebuffer?) enabled: */
+	nlines = 2;
+
+	/* Newer MDPs have split/packing logic, which fetches sub-sampled
+	 * U and V components (splits them from Y if necessary) and packs
+	 * them together, writes to SMP using a single client.
+	 */
+	if ((rev > 0) && (format->chroma_sample > CHROMA_FULL)) {
+		nplanes = 2;
+
+		/* if decimation is enabled, HW decimates less on the
+		 * sub sampled chroma components
+		 */
+		if (hdecim && (hsub > 1))
+			hsub = 1;
+	}
+
+	for (i = 0; i < nplanes; i++) {
+		int n, fetch_stride, cpp;
+
+		cpp = info->cpp[i];
+		fetch_stride = width * cpp / (i ? hsub : 1);
+
+		n = DIV_ROUND_UP(fetch_stride * nlines, smp->blk_size);
+
+		/* for hw rev v1.00 */
+		if (rev == 0)
+			n = roundup_pow_of_two(n);
+
+		blkcfg |= (n << (8 * i));
+	}
+
+	return blkcfg;
+}
+
+int mdp5_smp_assign(struct mdp5_smp *smp, struct mdp5_smp_state *state,
+		enum mdp5_pipe pipe, uint32_t blkcfg)
+{
+	struct mdp5_kms *mdp5_kms = get_kms(smp);
+	struct drm_device *dev = mdp5_kms->dev;
+	int i, ret;
+
+	for (i = 0; i < pipe2nclients(pipe); i++) {
+		u32 cid = pipe2client(pipe, i);
+		int n = blkcfg & 0xff;
+
+		if (!n)
+			continue;
+
+		DBG("%s[%d]: request %d SMP blocks", pipe2name(pipe), i, n);
+		ret = smp_request_block(smp, state, cid, n);
+		if (ret) {
+			DRM_DEV_ERROR(dev->dev, "Cannot allocate %d SMP blocks: %d\n",
+					n, ret);
+			return ret;
+		}
+
+		blkcfg >>= 8;
+	}
+
+	state->assigned |= (1 << pipe);
+
+	return 0;
+}
+
+/* Release SMP blocks for all clients of the pipe */
+void mdp5_smp_release(struct mdp5_smp *smp, struct mdp5_smp_state *state,
+		enum mdp5_pipe pipe)
+{
+	int i;
+	int cnt = smp->blk_cnt;
+
+	for (i = 0; i < pipe2nclients(pipe); i++) {
+		u32 cid = pipe2client(pipe, i);
+		void *cs = state->client_state[cid];
+
+		/* update global state: */
+		bitmap_andnot(state->state, state->state, cs, cnt);
+
+		/* clear client's state */
+		bitmap_zero(cs, cnt);
+	}
+
+	state->released |= (1 << pipe);
+}
+
+/* NOTE: SMP_ALLOC_* regs are *not* double buffered, so release has to
+ * happen after scanout completes.
+ */
+static unsigned update_smp_state(struct mdp5_smp *smp,
+		u32 cid, mdp5_smp_state_t *assigned)
+{
+	int cnt = smp->blk_cnt;
+	unsigned nblks = 0;
+	u32 blk, val;
+
+	for_each_set_bit(blk, *assigned, cnt) {
+		int idx = blk / 3;
+		int fld = blk % 3;
+
+		val = smp->alloc_w[idx];
+
+		switch (fld) {
+		case 0:
+			val &= ~MDP5_SMP_ALLOC_W_REG_CLIENT0__MASK;
+			val |= MDP5_SMP_ALLOC_W_REG_CLIENT0(cid);
+			break;
+		case 1:
+			val &= ~MDP5_SMP_ALLOC_W_REG_CLIENT1__MASK;
+			val |= MDP5_SMP_ALLOC_W_REG_CLIENT1(cid);
+			break;
+		case 2:
+			val &= ~MDP5_SMP_ALLOC_W_REG_CLIENT2__MASK;
+			val |= MDP5_SMP_ALLOC_W_REG_CLIENT2(cid);
+			break;
+		}
+
+		smp->alloc_w[idx] = val;
+		smp->alloc_r[idx] = val;
+
+		nblks++;
+	}
+
+	return nblks;
+}
+
+static void write_smp_alloc_regs(struct mdp5_smp *smp)
+{
+	struct mdp5_kms *mdp5_kms = get_kms(smp);
+	int i, num_regs;
+
+	num_regs = smp->blk_cnt / 3 + 1;
+
+	for (i = 0; i < num_regs; i++) {
+		mdp5_write(mdp5_kms, REG_MDP5_SMP_ALLOC_W_REG(i),
+			   smp->alloc_w[i]);
+		mdp5_write(mdp5_kms, REG_MDP5_SMP_ALLOC_R_REG(i),
+			   smp->alloc_r[i]);
+	}
+}
+
+static void write_smp_fifo_regs(struct mdp5_smp *smp)
+{
+	struct mdp5_kms *mdp5_kms = get_kms(smp);
+	int i;
+
+	for (i = 0; i < mdp5_kms->num_hwpipes; i++) {
+		struct mdp5_hw_pipe *hwpipe = mdp5_kms->hwpipes[i];
+		enum mdp5_pipe pipe = hwpipe->pipe;
+
+		mdp5_write(mdp5_kms, REG_MDP5_PIPE_REQPRIO_FIFO_WM_0(pipe),
+			   smp->pipe_reqprio_fifo_wm0[pipe]);
+		mdp5_write(mdp5_kms, REG_MDP5_PIPE_REQPRIO_FIFO_WM_1(pipe),
+			   smp->pipe_reqprio_fifo_wm1[pipe]);
+		mdp5_write(mdp5_kms, REG_MDP5_PIPE_REQPRIO_FIFO_WM_2(pipe),
+			   smp->pipe_reqprio_fifo_wm2[pipe]);
+	}
+}
+
+void mdp5_smp_prepare_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state)
+{
+	enum mdp5_pipe pipe;
+
+	for_each_set_bit(pipe, &state->assigned, sizeof(state->assigned) * 8) {
+		unsigned i, nblks = 0;
+
+		for (i = 0; i < pipe2nclients(pipe); i++) {
+			u32 cid = pipe2client(pipe, i);
+			void *cs = state->client_state[cid];
+
+			nblks += update_smp_state(smp, cid, cs);
+
+			DBG("assign %s:%u, %u blks",
+				pipe2name(pipe), i, nblks);
+		}
+
+		set_fifo_thresholds(smp, pipe, nblks);
+	}
+
+	write_smp_alloc_regs(smp);
+	write_smp_fifo_regs(smp);
+
+	state->assigned = 0;
+}
+
+void mdp5_smp_complete_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state)
+{
+	enum mdp5_pipe pipe;
+
+	for_each_set_bit(pipe, &state->released, sizeof(state->released) * 8) {
+		DBG("release %s", pipe2name(pipe));
+		set_fifo_thresholds(smp, pipe, 0);
+	}
+
+	write_smp_fifo_regs(smp);
+
+	state->released = 0;
+}
+
+void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p)
+{
+	struct mdp5_kms *mdp5_kms = get_kms(smp);
+	struct mdp5_hw_pipe_state *hwpstate;
+	struct mdp5_smp_state *state;
+	struct mdp5_global_state *global_state;
+	int total = 0, i, j;
+
+	drm_printf(p, "name\tinuse\tplane\n");
+	drm_printf(p, "----\t-----\t-----\n");
+
+	if (drm_can_sleep())
+		drm_modeset_lock(&mdp5_kms->glob_state_lock, NULL);
+
+	global_state = mdp5_get_existing_global_state(mdp5_kms);
+
+	/* grab these *after* we hold the state_lock */
+	hwpstate = &global_state->hwpipe;
+	state = &global_state->smp;
+
+	for (i = 0; i < mdp5_kms->num_hwpipes; i++) {
+		struct mdp5_hw_pipe *hwpipe = mdp5_kms->hwpipes[i];
+		struct drm_plane *plane = hwpstate->hwpipe_to_plane[hwpipe->idx];
+		enum mdp5_pipe pipe = hwpipe->pipe;
+		for (j = 0; j < pipe2nclients(pipe); j++) {
+			u32 cid = pipe2client(pipe, j);
+			void *cs = state->client_state[cid];
+			int inuse = bitmap_weight(cs, smp->blk_cnt);
+
+			drm_printf(p, "%s:%d\t%d\t%s\n",
+				pipe2name(pipe), j, inuse,
+				plane ? plane->name : NULL);
+
+			total += inuse;
+		}
+	}
+
+	drm_printf(p, "TOTAL:\t%d\t(of %d)\n", total, smp->blk_cnt);
+	drm_printf(p, "AVAIL:\t%d\n", smp->blk_cnt -
+			bitmap_weight(state->state, smp->blk_cnt));
+
+	if (drm_can_sleep())
+		drm_modeset_unlock(&mdp5_kms->glob_state_lock);
+}
+
+void mdp5_smp_destroy(struct mdp5_smp *smp)
+{
+	kfree(smp);
+}
+
+struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms, const struct mdp5_smp_block *cfg)
+{
+	struct mdp5_smp_state *state;
+	struct mdp5_global_state *global_state;
+	struct mdp5_smp *smp = NULL;
+	int ret;
+
+	smp = kzalloc(sizeof(*smp), GFP_KERNEL);
+	if (unlikely(!smp)) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	smp->dev = mdp5_kms->dev;
+	smp->blk_cnt = cfg->mmb_count;
+	smp->blk_size = cfg->mmb_size;
+
+	global_state = mdp5_get_existing_global_state(mdp5_kms);
+	state = &global_state->smp;
+
+	/* statically tied MMBs cannot be re-allocated: */
+	bitmap_copy(state->state, cfg->reserved_state, smp->blk_cnt);
+	memcpy(smp->reserved, cfg->reserved, sizeof(smp->reserved));
+
+	return smp;
+fail:
+	if (smp)
+		mdp5_smp_destroy(smp);
+
+	return ERR_PTR(ret);
+}