Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 898 insertions, 0 deletions

diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c
new file mode 100644
index 000000000..1d2b27e3e
--- /dev/null
+++ b/drivers/soc/fsl/dpio/dpio-service.c
@@ -0,0 +1,898 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * Copyright 2014-2016 Freescale Semiconductor Inc.
+ * Copyright 2016-2019 NXP
+ *
+ */
+#include <linux/types.h>
+#include <linux/fsl/mc.h>
+#include <soc/fsl/dpaa2-io.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/dim.h>
+#include <linux/slab.h>
+
+#include "dpio.h"
+#include "qbman-portal.h"
+
+struct dpaa2_io {
+	struct dpaa2_io_desc dpio_desc;
+	struct qbman_swp_desc swp_desc;
+	struct qbman_swp *swp;
+	struct list_head node;
+	/* protect against multiple management commands */
+	spinlock_t lock_mgmt_cmd;
+	/* protect notifications list */
+	spinlock_t lock_notifications;
+	struct list_head notifications;
+	struct device *dev;
+
+	/* Net DIM */
+	struct dim rx_dim;
+	/* protect against concurrent Net DIM updates */
+	spinlock_t dim_lock;
+	u16 event_ctr;
+	u64 bytes;
+	u64 frames;
+};
+
+struct dpaa2_io_store {
+	unsigned int max;
+	dma_addr_t paddr;
+	struct dpaa2_dq *vaddr;
+	void *alloced_addr;    /* unaligned value from kmalloc() */
+	unsigned int idx;      /* position of the next-to-be-returned entry */
+	struct qbman_swp *swp; /* portal used to issue VDQCR */
+	struct device *dev;    /* device used for DMA mapping */
+};
+
+/* keep a per cpu array of DPIOs for fast access */
+static struct dpaa2_io *dpio_by_cpu[NR_CPUS];
+static struct list_head dpio_list = LIST_HEAD_INIT(dpio_list);
+static DEFINE_SPINLOCK(dpio_list_lock);
+
+static inline struct dpaa2_io *service_select_by_cpu(struct dpaa2_io *d,
+						     int cpu)
+{
+	if (d)
+		return d;
+
+	if (cpu != DPAA2_IO_ANY_CPU && cpu >= num_possible_cpus())
+		return NULL;
+
+	/*
+	 * If cpu == -1, choose the current cpu, with no guarantees about
+	 * potentially being migrated away.
+	 */
+	if (cpu < 0)
+		cpu = raw_smp_processor_id();
+
+	/* If a specific cpu was requested, pick it up immediately */
+	return dpio_by_cpu[cpu];
+}
+
+static inline struct dpaa2_io *service_select(struct dpaa2_io *d)
+{
+	if (d)
+		return d;
+
+	d = service_select_by_cpu(d, -1);
+	if (d)
+		return d;
+
+	spin_lock(&dpio_list_lock);
+	d = list_entry(dpio_list.next, struct dpaa2_io, node);
+	list_del(&d->node);
+	list_add_tail(&d->node, &dpio_list);
+	spin_unlock(&dpio_list_lock);
+
+	return d;
+}
+
+/**
+ * dpaa2_io_service_select() - return a dpaa2_io service affined to this cpu
+ * @cpu: the cpu id
+ *
+ * Return the affine dpaa2_io service, or NULL if there is no service affined
+ * to the specified cpu. If DPAA2_IO_ANY_CPU is used, return the next available
+ * service.
+ */
+struct dpaa2_io *dpaa2_io_service_select(int cpu)
+{
+	if (cpu == DPAA2_IO_ANY_CPU)
+		return service_select(NULL);
+
+	return service_select_by_cpu(NULL, cpu);
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_service_select);
+
+static void dpaa2_io_dim_work(struct work_struct *w)
+{
+	struct dim *dim = container_of(w, struct dim, work);
+	struct dim_cq_moder moder =
+		net_dim_get_rx_moderation(dim->mode, dim->profile_ix);
+	struct dpaa2_io *d = container_of(dim, struct dpaa2_io, rx_dim);
+
+	dpaa2_io_set_irq_coalescing(d, moder.usec);
+	dim->state = DIM_START_MEASURE;
+}
+
+/**
+ * dpaa2_io_create() - create a dpaa2_io object.
+ * @desc: the dpaa2_io descriptor
+ * @dev: the actual DPIO device
+ *
+ * Activates a "struct dpaa2_io" corresponding to the given config of an actual
+ * DPIO object.
+ *
+ * Return a valid dpaa2_io object for success, or NULL for failure.
+ */
+struct dpaa2_io *dpaa2_io_create(const struct dpaa2_io_desc *desc,
+				 struct device *dev)
+{
+	struct dpaa2_io *obj = kmalloc(sizeof(*obj), GFP_KERNEL);
+	u32 qman_256_cycles_per_ns;
+
+	if (!obj)
+		return NULL;
+
+	/* check if CPU is out of range (-1 means any cpu) */
+	if (desc->cpu != DPAA2_IO_ANY_CPU && desc->cpu >= num_possible_cpus()) {
+		kfree(obj);
+		return NULL;
+	}
+
+	obj->dpio_desc = *desc;
+	obj->swp_desc.cena_bar = obj->dpio_desc.regs_cena;
+	obj->swp_desc.cinh_bar = obj->dpio_desc.regs_cinh;
+	obj->swp_desc.qman_clk = obj->dpio_desc.qman_clk;
+	obj->swp_desc.qman_version = obj->dpio_desc.qman_version;
+
+	/* Compute how many 256 QBMAN cycles fit into one ns. This is because
+	 * the interrupt timeout period register needs to be specified in QBMAN
+	 * clock cycles in increments of 256.
+	 */
+	qman_256_cycles_per_ns = 256000 / (obj->swp_desc.qman_clk / 1000000);
+	obj->swp_desc.qman_256_cycles_per_ns = qman_256_cycles_per_ns;
+	obj->swp = qbman_swp_init(&obj->swp_desc);
+
+	if (!obj->swp) {
+		kfree(obj);
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&obj->node);
+	spin_lock_init(&obj->lock_mgmt_cmd);
+	spin_lock_init(&obj->lock_notifications);
+	spin_lock_init(&obj->dim_lock);
+	INIT_LIST_HEAD(&obj->notifications);
+
+	/* For now only enable DQRR interrupts */
+	qbman_swp_interrupt_set_trigger(obj->swp,
+					QBMAN_SWP_INTERRUPT_DQRI);
+	qbman_swp_interrupt_clear_status(obj->swp, 0xffffffff);
+	if (obj->dpio_desc.receives_notifications)
+		qbman_swp_push_set(obj->swp, 0, 1);
+
+	spin_lock(&dpio_list_lock);
+	list_add_tail(&obj->node, &dpio_list);
+	if (desc->cpu >= 0 && !dpio_by_cpu[desc->cpu])
+		dpio_by_cpu[desc->cpu] = obj;
+	spin_unlock(&dpio_list_lock);
+
+	obj->dev = dev;
+
+	memset(&obj->rx_dim, 0, sizeof(obj->rx_dim));
+	INIT_WORK(&obj->rx_dim.work, dpaa2_io_dim_work);
+	obj->event_ctr = 0;
+	obj->bytes = 0;
+	obj->frames = 0;
+
+	return obj;
+}
+
+/**
+ * dpaa2_io_down() - release the dpaa2_io object.
+ * @d: the dpaa2_io object to be released.
+ *
+ * The "struct dpaa2_io" type can represent an individual DPIO object (as
+ * described by "struct dpaa2_io_desc") or an instance of a "DPIO service",
+ * which can be used to group/encapsulate multiple DPIO objects. In all cases,
+ * each handle obtained should be released using this function.
+ */
+void dpaa2_io_down(struct dpaa2_io *d)
+{
+	spin_lock(&dpio_list_lock);
+	dpio_by_cpu[d->dpio_desc.cpu] = NULL;
+	list_del(&d->node);
+	spin_unlock(&dpio_list_lock);
+
+	kfree(d);
+}
+
+#define DPAA_POLL_MAX 32
+
+/**
+ * dpaa2_io_irq() - ISR for DPIO interrupts
+ *
+ * @obj: the given DPIO object.
+ *
+ * Return IRQ_HANDLED for success or IRQ_NONE if there
+ * were no pending interrupts.
+ */
+irqreturn_t dpaa2_io_irq(struct dpaa2_io *obj)
+{
+	const struct dpaa2_dq *dq;
+	int max = 0;
+	struct qbman_swp *swp;
+	u32 status;
+
+	obj->event_ctr++;
+
+	swp = obj->swp;
+	status = qbman_swp_interrupt_read_status(swp);
+	if (!status)
+		return IRQ_NONE;
+
+	dq = qbman_swp_dqrr_next(swp);
+	while (dq) {
+		if (qbman_result_is_SCN(dq)) {
+			struct dpaa2_io_notification_ctx *ctx;
+			u64 q64;
+
+			q64 = qbman_result_SCN_ctx(dq);
+			ctx = (void *)(uintptr_t)q64;
+			ctx->cb(ctx);
+		} else {
+			pr_crit("fsl-mc-dpio: Unrecognised/ignored DQRR entry\n");
+		}
+		qbman_swp_dqrr_consume(swp, dq);
+		++max;
+		if (max > DPAA_POLL_MAX)
+			goto done;
+		dq = qbman_swp_dqrr_next(swp);
+	}
+done:
+	qbman_swp_interrupt_clear_status(swp, status);
+	qbman_swp_interrupt_set_inhibit(swp, 0);
+	return IRQ_HANDLED;
+}
+
+/**
+ * dpaa2_io_get_cpu() - get the cpu associated with a given DPIO object
+ *
+ * @d: the given DPIO object.
+ *
+ * Return the cpu associated with the DPIO object
+ */
+int dpaa2_io_get_cpu(struct dpaa2_io *d)
+{
+	return d->dpio_desc.cpu;
+}
+EXPORT_SYMBOL(dpaa2_io_get_cpu);
+
+/**
+ * dpaa2_io_service_register() - Prepare for servicing of FQDAN or CDAN
+ *                               notifications on the given DPIO service.
+ * @d:   the given DPIO service.
+ * @ctx: the notification context.
+ * @dev: the device that requests the register
+ *
+ * The caller should make the MC command to attach a DPAA2 object to
+ * a DPIO after this function completes successfully.  In that way:
+ *    (a) The DPIO service is "ready" to handle a notification arrival
+ *        (which might happen before the "attach" command to MC has
+ *        returned control of execution back to the caller)
+ *    (b) The DPIO service can provide back to the caller the 'dpio_id' and
+ *        'qman64' parameters that it should pass along in the MC command
+ *        in order for the object to be configured to produce the right
+ *        notification fields to the DPIO service.
+ *
+ * Return 0 for success, or -ENODEV for failure.
+ */
+int dpaa2_io_service_register(struct dpaa2_io *d,
+			      struct dpaa2_io_notification_ctx *ctx,
+			      struct device *dev)
+{
+	struct device_link *link;
+	unsigned long irqflags;
+
+	d = service_select_by_cpu(d, ctx->desired_cpu);
+	if (!d)
+		return -ENODEV;
+
+	link = device_link_add(dev, d->dev, DL_FLAG_AUTOREMOVE_CONSUMER);
+	if (!link)
+		return -EINVAL;
+
+	ctx->dpio_id = d->dpio_desc.dpio_id;
+	ctx->qman64 = (u64)(uintptr_t)ctx;
+	ctx->dpio_private = d;
+	spin_lock_irqsave(&d->lock_notifications, irqflags);
+	list_add(&ctx->node, &d->notifications);
+	spin_unlock_irqrestore(&d->lock_notifications, irqflags);
+
+	/* Enable the generation of CDAN notifications */
+	if (ctx->is_cdan)
+		return qbman_swp_CDAN_set_context_enable(d->swp,
+							 (u16)ctx->id,
+							 ctx->qman64);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_service_register);
+
+/**
+ * dpaa2_io_service_deregister - The opposite of 'register'.
+ * @service: the given DPIO service.
+ * @ctx: the notification context.
+ * @dev: the device that requests to be deregistered
+ *
+ * This function should be called only after sending the MC command to
+ * to detach the notification-producing device from the DPIO.
+ */
+void dpaa2_io_service_deregister(struct dpaa2_io *service,
+				 struct dpaa2_io_notification_ctx *ctx,
+				 struct device *dev)
+{
+	struct dpaa2_io *d = ctx->dpio_private;
+	unsigned long irqflags;
+
+	if (ctx->is_cdan)
+		qbman_swp_CDAN_disable(d->swp, (u16)ctx->id);
+
+	spin_lock_irqsave(&d->lock_notifications, irqflags);
+	list_del(&ctx->node);
+	spin_unlock_irqrestore(&d->lock_notifications, irqflags);
+
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_service_deregister);
+
+/**
+ * dpaa2_io_service_rearm() - Rearm the notification for the given DPIO service.
+ * @d: the given DPIO service.
+ * @ctx: the notification context.
+ *
+ * Once a FQDAN/CDAN has been produced, the corresponding FQ/channel is
+ * considered "disarmed". Ie. the user can issue pull dequeue operations on that
+ * traffic source for as long as it likes. Eventually it may wish to "rearm"
+ * that source to allow it to produce another FQDAN/CDAN, that's what this
+ * function achieves.
+ *
+ * Return 0 for success.
+ */
+int dpaa2_io_service_rearm(struct dpaa2_io *d,
+			   struct dpaa2_io_notification_ctx *ctx)
+{
+	unsigned long irqflags;
+	int err;
+
+	d = service_select_by_cpu(d, ctx->desired_cpu);
+	if (!unlikely(d))
+		return -ENODEV;
+
+	spin_lock_irqsave(&d->lock_mgmt_cmd, irqflags);
+	if (ctx->is_cdan)
+		err = qbman_swp_CDAN_enable(d->swp, (u16)ctx->id);
+	else
+		err = qbman_swp_fq_schedule(d->swp, ctx->id);
+	spin_unlock_irqrestore(&d->lock_mgmt_cmd, irqflags);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_service_rearm);
+
+/**
+ * dpaa2_io_service_pull_fq() - pull dequeue functions from a fq.
+ * @d: the given DPIO service.
+ * @fqid: the given frame queue id.
+ * @s: the dpaa2_io_store object for the result.
+ *
+ * Return 0 for success, or error code for failure.
+ */
+int dpaa2_io_service_pull_fq(struct dpaa2_io *d, u32 fqid,
+			     struct dpaa2_io_store *s)
+{
+	struct qbman_pull_desc pd;
+	int err;
+
+	qbman_pull_desc_clear(&pd);
+	qbman_pull_desc_set_storage(&pd, s->vaddr, s->paddr, 1);
+	qbman_pull_desc_set_numframes(&pd, (u8)s->max);
+	qbman_pull_desc_set_fq(&pd, fqid);
+
+	d = service_select(d);
+	if (!d)
+		return -ENODEV;
+	s->swp = d->swp;
+	err = qbman_swp_pull(d->swp, &pd);
+	if (err)
+		s->swp = NULL;
+
+	return err;
+}
+EXPORT_SYMBOL(dpaa2_io_service_pull_fq);
+
+/**
+ * dpaa2_io_service_pull_channel() - pull dequeue functions from a channel.
+ * @d: the given DPIO service.
+ * @channelid: the given channel id.
+ * @s: the dpaa2_io_store object for the result.
+ *
+ * Return 0 for success, or error code for failure.
+ */
+int dpaa2_io_service_pull_channel(struct dpaa2_io *d, u32 channelid,
+				  struct dpaa2_io_store *s)
+{
+	struct qbman_pull_desc pd;
+	int err;
+
+	qbman_pull_desc_clear(&pd);
+	qbman_pull_desc_set_storage(&pd, s->vaddr, s->paddr, 1);
+	qbman_pull_desc_set_numframes(&pd, (u8)s->max);
+	qbman_pull_desc_set_channel(&pd, channelid, qbman_pull_type_prio);
+
+	d = service_select(d);
+	if (!d)
+		return -ENODEV;
+
+	s->swp = d->swp;
+	err = qbman_swp_pull(d->swp, &pd);
+	if (err)
+		s->swp = NULL;
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_service_pull_channel);
+
+/**
+ * dpaa2_io_service_enqueue_fq() - Enqueue a frame to a frame queue.
+ * @d: the given DPIO service.
+ * @fqid: the given frame queue id.
+ * @fd: the frame descriptor which is enqueued.
+ *
+ * Return 0 for successful enqueue, -EBUSY if the enqueue ring is not ready,
+ * or -ENODEV if there is no dpio service.
+ */
+int dpaa2_io_service_enqueue_fq(struct dpaa2_io *d,
+				u32 fqid,
+				const struct dpaa2_fd *fd)
+{
+	struct qbman_eq_desc ed;
+
+	d = service_select(d);
+	if (!d)
+		return -ENODEV;
+
+	qbman_eq_desc_clear(&ed);
+	qbman_eq_desc_set_no_orp(&ed, 0);
+	qbman_eq_desc_set_fq(&ed, fqid);
+
+	return qbman_swp_enqueue(d->swp, &ed, fd);
+}
+EXPORT_SYMBOL(dpaa2_io_service_enqueue_fq);
+
+/**
+ * dpaa2_io_service_enqueue_multiple_fq() - Enqueue multiple frames
+ * to a frame queue using one fqid.
+ * @d: the given DPIO service.
+ * @fqid: the given frame queue id.
+ * @fd: the frame descriptor which is enqueued.
+ * @nb: number of frames to be enqueud
+ *
+ * Return 0 for successful enqueue, -EBUSY if the enqueue ring is not ready,
+ * or -ENODEV if there is no dpio service.
+ */
+int dpaa2_io_service_enqueue_multiple_fq(struct dpaa2_io *d,
+				u32 fqid,
+				const struct dpaa2_fd *fd,
+				int nb)
+{
+	struct qbman_eq_desc ed;
+
+	d = service_select(d);
+	if (!d)
+		return -ENODEV;
+
+	qbman_eq_desc_clear(&ed);
+	qbman_eq_desc_set_no_orp(&ed, 0);
+	qbman_eq_desc_set_fq(&ed, fqid);
+
+	return qbman_swp_enqueue_multiple(d->swp, &ed, fd, NULL, nb);
+}
+EXPORT_SYMBOL(dpaa2_io_service_enqueue_multiple_fq);
+
+/**
+ * dpaa2_io_service_enqueue_multiple_desc_fq() - Enqueue multiple frames
+ * to different frame queue using a list of fqids.
+ * @d: the given DPIO service.
+ * @fqid: the given list of frame queue ids.
+ * @fd: the frame descriptor which is enqueued.
+ * @nb: number of frames to be enqueud
+ *
+ * Return 0 for successful enqueue, -EBUSY if the enqueue ring is not ready,
+ * or -ENODEV if there is no dpio service.
+ */
+int dpaa2_io_service_enqueue_multiple_desc_fq(struct dpaa2_io *d,
+				u32 *fqid,
+				const struct dpaa2_fd *fd,
+				int nb)
+{
+	struct qbman_eq_desc *ed;
+	int i, ret;
+
+	ed = kcalloc(sizeof(struct qbman_eq_desc), 32, GFP_KERNEL);
+	if (!ed)
+		return -ENOMEM;
+
+	d = service_select(d);
+	if (!d) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	for (i = 0; i < nb; i++) {
+		qbman_eq_desc_clear(&ed[i]);
+		qbman_eq_desc_set_no_orp(&ed[i], 0);
+		qbman_eq_desc_set_fq(&ed[i], fqid[i]);
+	}
+
+	ret = qbman_swp_enqueue_multiple_desc(d->swp, &ed[0], fd, nb);
+out:
+	kfree(ed);
+	return ret;
+}
+EXPORT_SYMBOL(dpaa2_io_service_enqueue_multiple_desc_fq);
+
+/**
+ * dpaa2_io_service_enqueue_qd() - Enqueue a frame to a QD.
+ * @d: the given DPIO service.
+ * @qdid: the given queuing destination id.
+ * @prio: the given queuing priority.
+ * @qdbin: the given queuing destination bin.
+ * @fd: the frame descriptor which is enqueued.
+ *
+ * Return 0 for successful enqueue, or -EBUSY if the enqueue ring is not ready,
+ * or -ENODEV if there is no dpio service.
+ */
+int dpaa2_io_service_enqueue_qd(struct dpaa2_io *d,
+				u32 qdid, u8 prio, u16 qdbin,
+				const struct dpaa2_fd *fd)
+{
+	struct qbman_eq_desc ed;
+
+	d = service_select(d);
+	if (!d)
+		return -ENODEV;
+
+	qbman_eq_desc_clear(&ed);
+	qbman_eq_desc_set_no_orp(&ed, 0);
+	qbman_eq_desc_set_qd(&ed, qdid, qdbin, prio);
+
+	return qbman_swp_enqueue(d->swp, &ed, fd);
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_service_enqueue_qd);
+
+/**
+ * dpaa2_io_service_release() - Release buffers to a buffer pool.
+ * @d: the given DPIO object.
+ * @bpid: the buffer pool id.
+ * @buffers: the buffers to be released.
+ * @num_buffers: the number of the buffers to be released.
+ *
+ * Return 0 for success, and negative error code for failure.
+ */
+int dpaa2_io_service_release(struct dpaa2_io *d,
+			     u16 bpid,
+			     const u64 *buffers,
+			     unsigned int num_buffers)
+{
+	struct qbman_release_desc rd;
+
+	d = service_select(d);
+	if (!d)
+		return -ENODEV;
+
+	qbman_release_desc_clear(&rd);
+	qbman_release_desc_set_bpid(&rd, bpid);
+
+	return qbman_swp_release(d->swp, &rd, buffers, num_buffers);
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_service_release);
+
+/**
+ * dpaa2_io_service_acquire() - Acquire buffers from a buffer pool.
+ * @d: the given DPIO object.
+ * @bpid: the buffer pool id.
+ * @buffers: the buffer addresses for acquired buffers.
+ * @num_buffers: the expected number of the buffers to acquire.
+ *
+ * Return a negative error code if the command failed, otherwise it returns
+ * the number of buffers acquired, which may be less than the number requested.
+ * Eg. if the buffer pool is empty, this will return zero.
+ */
+int dpaa2_io_service_acquire(struct dpaa2_io *d,
+			     u16 bpid,
+			     u64 *buffers,
+			     unsigned int num_buffers)
+{
+	unsigned long irqflags;
+	int err;
+
+	d = service_select(d);
+	if (!d)
+		return -ENODEV;
+
+	spin_lock_irqsave(&d->lock_mgmt_cmd, irqflags);
+	err = qbman_swp_acquire(d->swp, bpid, buffers, num_buffers);
+	spin_unlock_irqrestore(&d->lock_mgmt_cmd, irqflags);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_service_acquire);
+
+/*
+ * 'Stores' are reusable memory blocks for holding dequeue results, and to
+ * assist with parsing those results.
+ */
+
+/**
+ * dpaa2_io_store_create() - Create the dma memory storage for dequeue result.
+ * @max_frames: the maximum number of dequeued result for frames, must be <= 32.
+ * @dev:        the device to allow mapping/unmapping the DMAable region.
+ *
+ * The size of the storage is "max_frames*sizeof(struct dpaa2_dq)".
+ * The 'dpaa2_io_store' returned is a DPIO service managed object.
+ *
+ * Return pointer to dpaa2_io_store struct for successfully created storage
+ * memory, or NULL on error.
+ */
+struct dpaa2_io_store *dpaa2_io_store_create(unsigned int max_frames,
+					     struct device *dev)
+{
+	struct dpaa2_io_store *ret;
+	size_t size;
+
+	if (!max_frames || (max_frames > 32))
+		return NULL;
+
+	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
+	if (!ret)
+		return NULL;
+
+	ret->max = max_frames;
+	size = max_frames * sizeof(struct dpaa2_dq) + 64;
+	ret->alloced_addr = kzalloc(size, GFP_KERNEL);
+	if (!ret->alloced_addr) {
+		kfree(ret);
+		return NULL;
+	}
+
+	ret->vaddr = PTR_ALIGN(ret->alloced_addr, 64);
+	ret->paddr = dma_map_single(dev, ret->vaddr,
+				    sizeof(struct dpaa2_dq) * max_frames,
+				    DMA_FROM_DEVICE);
+	if (dma_mapping_error(dev, ret->paddr)) {
+		kfree(ret->alloced_addr);
+		kfree(ret);
+		return NULL;
+	}
+
+	ret->idx = 0;
+	ret->dev = dev;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_store_create);
+
+/**
+ * dpaa2_io_store_destroy() - Frees the dma memory storage for dequeue
+ *                            result.
+ * @s: the storage memory to be destroyed.
+ */
+void dpaa2_io_store_destroy(struct dpaa2_io_store *s)
+{
+	dma_unmap_single(s->dev, s->paddr, sizeof(struct dpaa2_dq) * s->max,
+			 DMA_FROM_DEVICE);
+	kfree(s->alloced_addr);
+	kfree(s);
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_store_destroy);
+
+/**
+ * dpaa2_io_store_next() - Determine when the next dequeue result is available.
+ * @s: the dpaa2_io_store object.
+ * @is_last: indicate whether this is the last frame in the pull command.
+ *
+ * When an object driver performs dequeues to a dpaa2_io_store, this function
+ * can be used to determine when the next frame result is available. Once
+ * this function returns non-NULL, a subsequent call to it will try to find
+ * the next dequeue result.
+ *
+ * Note that if a pull-dequeue has a NULL result because the target FQ/channel
+ * was empty, then this function will also return NULL (rather than expecting
+ * the caller to always check for this. As such, "is_last" can be used to
+ * differentiate between "end-of-empty-dequeue" and "still-waiting".
+ *
+ * Return dequeue result for a valid dequeue result, or NULL for empty dequeue.
+ */
+struct dpaa2_dq *dpaa2_io_store_next(struct dpaa2_io_store *s, int *is_last)
+{
+	int match;
+	struct dpaa2_dq *ret = &s->vaddr[s->idx];
+
+	match = qbman_result_has_new_result(s->swp, ret);
+	if (!match) {
+		*is_last = 0;
+		return NULL;
+	}
+
+	s->idx++;
+
+	if (dpaa2_dq_is_pull_complete(ret)) {
+		*is_last = 1;
+		s->idx = 0;
+		/*
+		 * If we get an empty dequeue result to terminate a zero-results
+		 * vdqcr, return NULL to the caller rather than expecting him to
+		 * check non-NULL results every time.
+		 */
+		if (!(dpaa2_dq_flags(ret) & DPAA2_DQ_STAT_VALIDFRAME))
+			ret = NULL;
+	} else {
+		prefetch(&s->vaddr[s->idx]);
+		*is_last = 0;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_store_next);
+
+/**
+ * dpaa2_io_query_fq_count() - Get the frame and byte count for a given fq.
+ * @d: the given DPIO object.
+ * @fqid: the id of frame queue to be queried.
+ * @fcnt: the queried frame count.
+ * @bcnt: the queried byte count.
+ *
+ * Knowing the FQ count at run-time can be useful in debugging situations.
+ * The instantaneous frame- and byte-count are hereby returned.
+ *
+ * Return 0 for a successful query, and negative error code if query fails.
+ */
+int dpaa2_io_query_fq_count(struct dpaa2_io *d, u32 fqid,
+			    u32 *fcnt, u32 *bcnt)
+{
+	struct qbman_fq_query_np_rslt state;
+	struct qbman_swp *swp;
+	unsigned long irqflags;
+	int ret;
+
+	d = service_select(d);
+	if (!d)
+		return -ENODEV;
+
+	swp = d->swp;
+	spin_lock_irqsave(&d->lock_mgmt_cmd, irqflags);
+	ret = qbman_fq_query_state(swp, fqid, &state);
+	spin_unlock_irqrestore(&d->lock_mgmt_cmd, irqflags);
+	if (ret)
+		return ret;
+	*fcnt = qbman_fq_state_frame_count(&state);
+	*bcnt = qbman_fq_state_byte_count(&state);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_query_fq_count);
+
+/**
+ * dpaa2_io_query_bp_count() - Query the number of buffers currently in a
+ * buffer pool.
+ * @d: the given DPIO object.
+ * @bpid: the index of buffer pool to be queried.
+ * @num: the queried number of buffers in the buffer pool.
+ *
+ * Return 0 for a successful query, and negative error code if query fails.
+ */
+int dpaa2_io_query_bp_count(struct dpaa2_io *d, u16 bpid, u32 *num)
+{
+	struct qbman_bp_query_rslt state;
+	struct qbman_swp *swp;
+	unsigned long irqflags;
+	int ret;
+
+	d = service_select(d);
+	if (!d)
+		return -ENODEV;
+
+	swp = d->swp;
+	spin_lock_irqsave(&d->lock_mgmt_cmd, irqflags);
+	ret = qbman_bp_query(swp, bpid, &state);
+	spin_unlock_irqrestore(&d->lock_mgmt_cmd, irqflags);
+	if (ret)
+		return ret;
+	*num = qbman_bp_info_num_free_bufs(&state);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_query_bp_count);
+
+/**
+ * dpaa2_io_set_irq_coalescing() - Set new IRQ coalescing values
+ * @d: the given DPIO object
+ * @irq_holdoff: interrupt holdoff (timeout) period in us
+ *
+ * Return 0 for success, or negative error code on error.
+ */
+int dpaa2_io_set_irq_coalescing(struct dpaa2_io *d, u32 irq_holdoff)
+{
+	struct qbman_swp *swp = d->swp;
+
+	return qbman_swp_set_irq_coalescing(swp, swp->dqrr.dqrr_size - 1,
+					    irq_holdoff);
+}
+EXPORT_SYMBOL(dpaa2_io_set_irq_coalescing);
+
+/**
+ * dpaa2_io_get_irq_coalescing() - Get the current IRQ coalescing parameters
+ * @d: the given DPIO object
+ * @irq_holdoff: interrupt holdoff (timeout) period in us
+ */
+void dpaa2_io_get_irq_coalescing(struct dpaa2_io *d, u32 *irq_holdoff)
+{
+	struct qbman_swp *swp = d->swp;
+
+	qbman_swp_get_irq_coalescing(swp, NULL, irq_holdoff);
+}
+EXPORT_SYMBOL(dpaa2_io_get_irq_coalescing);
+
+/**
+ * dpaa2_io_set_adaptive_coalescing() - Enable/disable adaptive coalescing
+ * @d: the given DPIO object
+ * @use_adaptive_rx_coalesce: adaptive coalescing state
+ */
+void dpaa2_io_set_adaptive_coalescing(struct dpaa2_io *d,
+				      int use_adaptive_rx_coalesce)
+{
+	d->swp->use_adaptive_rx_coalesce = use_adaptive_rx_coalesce;
+}
+EXPORT_SYMBOL(dpaa2_io_set_adaptive_coalescing);
+
+/**
+ * dpaa2_io_get_adaptive_coalescing() - Query adaptive coalescing state
+ * @d: the given DPIO object
+ *
+ * Return 1 when adaptive coalescing is enabled on the DPIO object and 0
+ * otherwise.
+ */
+int dpaa2_io_get_adaptive_coalescing(struct dpaa2_io *d)
+{
+	return d->swp->use_adaptive_rx_coalesce;
+}
+EXPORT_SYMBOL(dpaa2_io_get_adaptive_coalescing);
+
+/**
+ * dpaa2_io_update_net_dim() - Update Net DIM
+ * @d: the given DPIO object
+ * @frames: how many frames have been dequeued by the user since the last call
+ * @bytes: how many bytes have been dequeued by the user since the last call
+ */
+void dpaa2_io_update_net_dim(struct dpaa2_io *d, __u64 frames, __u64 bytes)
+{
+	struct dim_sample dim_sample = {};
+
+	if (!d->swp->use_adaptive_rx_coalesce)
+		return;
+
+	spin_lock(&d->dim_lock);
+
+	d->bytes += bytes;
+	d->frames += frames;
+
+	dim_update_sample(d->event_ctr, d->frames, d->bytes, &dim_sample);
+	net_dim(&d->rx_dim, dim_sample);
+
+	spin_unlock(&d->dim_lock);
+}
+EXPORT_SYMBOL(dpaa2_io_update_net_dim);