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, 424 insertions, 0 deletions

diff --git a/drivers/gpu/drm/imx/dcss/dcss-ctxld.c b/drivers/gpu/drm/imx/dcss/dcss-ctxld.c
new file mode 100644
index 000000000..3a84cb320
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-ctxld.c
@@ -0,0 +1,424 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "dcss-dev.h"
+
+#define DCSS_CTXLD_CONTROL_STATUS	0x0
+#define   CTXLD_ENABLE			BIT(0)
+#define   ARB_SEL			BIT(1)
+#define   RD_ERR_EN			BIT(2)
+#define   DB_COMP_EN			BIT(3)
+#define   SB_HP_COMP_EN			BIT(4)
+#define   SB_LP_COMP_EN			BIT(5)
+#define   DB_PEND_SB_REC_EN		BIT(6)
+#define   SB_PEND_DISP_ACTIVE_EN	BIT(7)
+#define   AHB_ERR_EN			BIT(8)
+#define   RD_ERR			BIT(16)
+#define   DB_COMP			BIT(17)
+#define   SB_HP_COMP			BIT(18)
+#define   SB_LP_COMP			BIT(19)
+#define   DB_PEND_SB_REC		BIT(20)
+#define   SB_PEND_DISP_ACTIVE		BIT(21)
+#define   AHB_ERR			BIT(22)
+#define DCSS_CTXLD_DB_BASE_ADDR		0x10
+#define DCSS_CTXLD_DB_COUNT		0x14
+#define DCSS_CTXLD_SB_BASE_ADDR		0x18
+#define DCSS_CTXLD_SB_COUNT		0x1C
+#define   SB_HP_COUNT_POS		0
+#define   SB_HP_COUNT_MASK		0xffff
+#define   SB_LP_COUNT_POS		16
+#define   SB_LP_COUNT_MASK		0xffff0000
+#define DCSS_AHB_ERR_ADDR		0x20
+
+#define CTXLD_IRQ_COMPLETION		(DB_COMP | SB_HP_COMP | SB_LP_COMP)
+#define CTXLD_IRQ_ERROR			(RD_ERR | DB_PEND_SB_REC | AHB_ERR)
+
+/* The following sizes are in context loader entries, 8 bytes each. */
+#define CTXLD_DB_CTX_ENTRIES		1024	/* max 65536 */
+#define CTXLD_SB_LP_CTX_ENTRIES		10240	/* max 65536 */
+#define CTXLD_SB_HP_CTX_ENTRIES		20000	/* max 65536 */
+#define CTXLD_SB_CTX_ENTRIES		(CTXLD_SB_LP_CTX_ENTRIES + \
+					 CTXLD_SB_HP_CTX_ENTRIES)
+
+/* Sizes, in entries, of the DB, SB_HP and SB_LP context regions. */
+static u16 dcss_ctxld_ctx_size[3] = {
+	CTXLD_DB_CTX_ENTRIES,
+	CTXLD_SB_HP_CTX_ENTRIES,
+	CTXLD_SB_LP_CTX_ENTRIES
+};
+
+/* this represents an entry in the context loader map */
+struct dcss_ctxld_item {
+	u32 val;
+	u32 ofs;
+};
+
+#define CTX_ITEM_SIZE			sizeof(struct dcss_ctxld_item)
+
+struct dcss_ctxld {
+	struct device *dev;
+	void __iomem *ctxld_reg;
+	int irq;
+	bool irq_en;
+
+	struct dcss_ctxld_item *db[2];
+	struct dcss_ctxld_item *sb_hp[2];
+	struct dcss_ctxld_item *sb_lp[2];
+
+	dma_addr_t db_paddr[2];
+	dma_addr_t sb_paddr[2];
+
+	u16 ctx_size[2][3]; /* holds the sizes of DB, SB_HP and SB_LP ctx */
+	u8 current_ctx;
+
+	bool in_use;
+	bool armed;
+
+	spinlock_t lock; /* protects concurent access to private data */
+};
+
+static irqreturn_t dcss_ctxld_irq_handler(int irq, void *data)
+{
+	struct dcss_ctxld *ctxld = data;
+	struct dcss_dev *dcss = dcss_drv_dev_to_dcss(ctxld->dev);
+	u32 irq_status;
+
+	irq_status = dcss_readl(ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS);
+
+	if (irq_status & CTXLD_IRQ_COMPLETION &&
+	    !(irq_status & CTXLD_ENABLE) && ctxld->in_use) {
+		ctxld->in_use = false;
+
+		if (dcss && dcss->disable_callback)
+			dcss->disable_callback(dcss);
+	} else if (irq_status & CTXLD_IRQ_ERROR) {
+		/*
+		 * Except for throwing an error message and clearing the status
+		 * register, there's not much we can do here.
+		 */
+		dev_err(ctxld->dev, "ctxld: error encountered: %08x\n",
+			irq_status);
+		dev_err(ctxld->dev, "ctxld: db=%d, sb_hp=%d, sb_lp=%d\n",
+			ctxld->ctx_size[ctxld->current_ctx ^ 1][CTX_DB],
+			ctxld->ctx_size[ctxld->current_ctx ^ 1][CTX_SB_HP],
+			ctxld->ctx_size[ctxld->current_ctx ^ 1][CTX_SB_LP]);
+	}
+
+	dcss_clr(irq_status & (CTXLD_IRQ_ERROR | CTXLD_IRQ_COMPLETION),
+		 ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS);
+
+	return IRQ_HANDLED;
+}
+
+static int dcss_ctxld_irq_config(struct dcss_ctxld *ctxld,
+				 struct platform_device *pdev)
+{
+	int ret;
+
+	ctxld->irq = platform_get_irq_byname(pdev, "ctxld");
+	if (ctxld->irq < 0)
+		return ctxld->irq;
+
+	ret = request_irq(ctxld->irq, dcss_ctxld_irq_handler,
+			  0, "dcss_ctxld", ctxld);
+	if (ret) {
+		dev_err(ctxld->dev, "ctxld: irq request failed.\n");
+		return ret;
+	}
+
+	ctxld->irq_en = true;
+
+	return 0;
+}
+
+static void dcss_ctxld_hw_cfg(struct dcss_ctxld *ctxld)
+{
+	dcss_writel(RD_ERR_EN | SB_HP_COMP_EN |
+		    DB_PEND_SB_REC_EN | AHB_ERR_EN | RD_ERR | AHB_ERR,
+		    ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS);
+}
+
+static void dcss_ctxld_free_ctx(struct dcss_ctxld *ctxld)
+{
+	struct dcss_ctxld_item *ctx;
+	int i;
+
+	for (i = 0; i < 2; i++) {
+		if (ctxld->db[i]) {
+			dma_free_coherent(ctxld->dev,
+					  CTXLD_DB_CTX_ENTRIES * sizeof(*ctx),
+					  ctxld->db[i], ctxld->db_paddr[i]);
+			ctxld->db[i] = NULL;
+			ctxld->db_paddr[i] = 0;
+		}
+
+		if (ctxld->sb_hp[i]) {
+			dma_free_coherent(ctxld->dev,
+					  CTXLD_SB_CTX_ENTRIES * sizeof(*ctx),
+					  ctxld->sb_hp[i], ctxld->sb_paddr[i]);
+			ctxld->sb_hp[i] = NULL;
+			ctxld->sb_paddr[i] = 0;
+		}
+	}
+}
+
+static int dcss_ctxld_alloc_ctx(struct dcss_ctxld *ctxld)
+{
+	struct dcss_ctxld_item *ctx;
+	int i;
+
+	for (i = 0; i < 2; i++) {
+		ctx = dma_alloc_coherent(ctxld->dev,
+					 CTXLD_DB_CTX_ENTRIES * sizeof(*ctx),
+					 &ctxld->db_paddr[i], GFP_KERNEL);
+		if (!ctx)
+			return -ENOMEM;
+
+		ctxld->db[i] = ctx;
+
+		ctx = dma_alloc_coherent(ctxld->dev,
+					 CTXLD_SB_CTX_ENTRIES * sizeof(*ctx),
+					 &ctxld->sb_paddr[i], GFP_KERNEL);
+		if (!ctx)
+			return -ENOMEM;
+
+		ctxld->sb_hp[i] = ctx;
+		ctxld->sb_lp[i] = ctx + CTXLD_SB_HP_CTX_ENTRIES;
+	}
+
+	return 0;
+}
+
+int dcss_ctxld_init(struct dcss_dev *dcss, unsigned long ctxld_base)
+{
+	struct dcss_ctxld *ctxld;
+	int ret;
+
+	ctxld = kzalloc(sizeof(*ctxld), GFP_KERNEL);
+	if (!ctxld)
+		return -ENOMEM;
+
+	dcss->ctxld = ctxld;
+	ctxld->dev = dcss->dev;
+
+	spin_lock_init(&ctxld->lock);
+
+	ret = dcss_ctxld_alloc_ctx(ctxld);
+	if (ret) {
+		dev_err(dcss->dev, "ctxld: cannot allocate context memory.\n");
+		goto err;
+	}
+
+	ctxld->ctxld_reg = ioremap(ctxld_base, SZ_4K);
+	if (!ctxld->ctxld_reg) {
+		dev_err(dcss->dev, "ctxld: unable to remap ctxld base\n");
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	ret = dcss_ctxld_irq_config(ctxld, to_platform_device(dcss->dev));
+	if (ret)
+		goto err_irq;
+
+	dcss_ctxld_hw_cfg(ctxld);
+
+	return 0;
+
+err_irq:
+	iounmap(ctxld->ctxld_reg);
+
+err:
+	dcss_ctxld_free_ctx(ctxld);
+	kfree(ctxld);
+
+	return ret;
+}
+
+void dcss_ctxld_exit(struct dcss_ctxld *ctxld)
+{
+	free_irq(ctxld->irq, ctxld);
+
+	if (ctxld->ctxld_reg)
+		iounmap(ctxld->ctxld_reg);
+
+	dcss_ctxld_free_ctx(ctxld);
+	kfree(ctxld);
+}
+
+static int dcss_ctxld_enable_locked(struct dcss_ctxld *ctxld)
+{
+	int curr_ctx = ctxld->current_ctx;
+	u32 db_base, sb_base, sb_count;
+	u32 sb_hp_cnt, sb_lp_cnt, db_cnt;
+	struct dcss_dev *dcss = dcss_drv_dev_to_dcss(ctxld->dev);
+
+	if (!dcss)
+		return 0;
+
+	dcss_dpr_write_sysctrl(dcss->dpr);
+
+	dcss_scaler_write_sclctrl(dcss->scaler);
+
+	sb_hp_cnt = ctxld->ctx_size[curr_ctx][CTX_SB_HP];
+	sb_lp_cnt = ctxld->ctx_size[curr_ctx][CTX_SB_LP];
+	db_cnt = ctxld->ctx_size[curr_ctx][CTX_DB];
+
+	/* make sure SB_LP context area comes after SB_HP */
+	if (sb_lp_cnt &&
+	    ctxld->sb_lp[curr_ctx] != ctxld->sb_hp[curr_ctx] + sb_hp_cnt) {
+		struct dcss_ctxld_item *sb_lp_adjusted;
+
+		sb_lp_adjusted = ctxld->sb_hp[curr_ctx] + sb_hp_cnt;
+
+		memcpy(sb_lp_adjusted, ctxld->sb_lp[curr_ctx],
+		       sb_lp_cnt * CTX_ITEM_SIZE);
+	}
+
+	db_base = db_cnt ? ctxld->db_paddr[curr_ctx] : 0;
+
+	dcss_writel(db_base, ctxld->ctxld_reg + DCSS_CTXLD_DB_BASE_ADDR);
+	dcss_writel(db_cnt, ctxld->ctxld_reg + DCSS_CTXLD_DB_COUNT);
+
+	if (sb_hp_cnt)
+		sb_count = ((sb_hp_cnt << SB_HP_COUNT_POS) & SB_HP_COUNT_MASK) |
+			   ((sb_lp_cnt << SB_LP_COUNT_POS) & SB_LP_COUNT_MASK);
+	else
+		sb_count = (sb_lp_cnt << SB_HP_COUNT_POS) & SB_HP_COUNT_MASK;
+
+	sb_base = sb_count ? ctxld->sb_paddr[curr_ctx] : 0;
+
+	dcss_writel(sb_base, ctxld->ctxld_reg + DCSS_CTXLD_SB_BASE_ADDR);
+	dcss_writel(sb_count, ctxld->ctxld_reg + DCSS_CTXLD_SB_COUNT);
+
+	/* enable the context loader */
+	dcss_set(CTXLD_ENABLE, ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS);
+
+	ctxld->in_use = true;
+
+	/*
+	 * Toggle the current context to the alternate one so that any updates
+	 * in the modules' settings take place there.
+	 */
+	ctxld->current_ctx ^= 1;
+
+	ctxld->ctx_size[ctxld->current_ctx][CTX_DB] = 0;
+	ctxld->ctx_size[ctxld->current_ctx][CTX_SB_HP] = 0;
+	ctxld->ctx_size[ctxld->current_ctx][CTX_SB_LP] = 0;
+
+	return 0;
+}
+
+int dcss_ctxld_enable(struct dcss_ctxld *ctxld)
+{
+	spin_lock_irq(&ctxld->lock);
+	ctxld->armed = true;
+	spin_unlock_irq(&ctxld->lock);
+
+	return 0;
+}
+
+void dcss_ctxld_kick(struct dcss_ctxld *ctxld)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&ctxld->lock, flags);
+	if (ctxld->armed && !ctxld->in_use) {
+		ctxld->armed = false;
+		dcss_ctxld_enable_locked(ctxld);
+	}
+	spin_unlock_irqrestore(&ctxld->lock, flags);
+}
+
+void dcss_ctxld_write_irqsafe(struct dcss_ctxld *ctxld, u32 ctx_id, u32 val,
+			      u32 reg_ofs)
+{
+	int curr_ctx = ctxld->current_ctx;
+	struct dcss_ctxld_item *ctx[] = {
+		[CTX_DB] = ctxld->db[curr_ctx],
+		[CTX_SB_HP] = ctxld->sb_hp[curr_ctx],
+		[CTX_SB_LP] = ctxld->sb_lp[curr_ctx]
+	};
+	int item_idx = ctxld->ctx_size[curr_ctx][ctx_id];
+
+	if (item_idx + 1 > dcss_ctxld_ctx_size[ctx_id]) {
+		WARN_ON(1);
+		return;
+	}
+
+	ctx[ctx_id][item_idx].val = val;
+	ctx[ctx_id][item_idx].ofs = reg_ofs;
+	ctxld->ctx_size[curr_ctx][ctx_id] += 1;
+}
+
+void dcss_ctxld_write(struct dcss_ctxld *ctxld, u32 ctx_id,
+		      u32 val, u32 reg_ofs)
+{
+	spin_lock_irq(&ctxld->lock);
+	dcss_ctxld_write_irqsafe(ctxld, ctx_id, val, reg_ofs);
+	spin_unlock_irq(&ctxld->lock);
+}
+
+bool dcss_ctxld_is_flushed(struct dcss_ctxld *ctxld)
+{
+	return ctxld->ctx_size[ctxld->current_ctx][CTX_DB] == 0 &&
+		ctxld->ctx_size[ctxld->current_ctx][CTX_SB_HP] == 0 &&
+		ctxld->ctx_size[ctxld->current_ctx][CTX_SB_LP] == 0;
+}
+
+int dcss_ctxld_resume(struct dcss_ctxld *ctxld)
+{
+	dcss_ctxld_hw_cfg(ctxld);
+
+	if (!ctxld->irq_en) {
+		enable_irq(ctxld->irq);
+		ctxld->irq_en = true;
+	}
+
+	return 0;
+}
+
+int dcss_ctxld_suspend(struct dcss_ctxld *ctxld)
+{
+	int ret = 0;
+	unsigned long timeout = jiffies + msecs_to_jiffies(500);
+
+	if (!dcss_ctxld_is_flushed(ctxld)) {
+		dcss_ctxld_kick(ctxld);
+
+		while (!time_after(jiffies, timeout) && ctxld->in_use)
+			msleep(20);
+
+		if (time_after(jiffies, timeout))
+			return -ETIMEDOUT;
+	}
+
+	spin_lock_irq(&ctxld->lock);
+
+	if (ctxld->irq_en) {
+		disable_irq_nosync(ctxld->irq);
+		ctxld->irq_en = false;
+	}
+
+	/* reset context region and sizes */
+	ctxld->current_ctx = 0;
+	ctxld->ctx_size[0][CTX_DB] = 0;
+	ctxld->ctx_size[0][CTX_SB_HP] = 0;
+	ctxld->ctx_size[0][CTX_SB_LP] = 0;
+
+	spin_unlock_irq(&ctxld->lock);
+
+	return ret;
+}
+
+void dcss_ctxld_assert_locked(struct dcss_ctxld *ctxld)
+{
+	lockdep_assert_held(&ctxld->lock);
+}