1 files changed, 611 insertions, 0 deletions

diff --git a/drivers/accel/habanalabs/common/irq.c b/drivers/accel/habanalabs/common/irq.c
new file mode 100644
index 0000000000..b1010d206c
--- /dev/null
+++ b/drivers/accel/habanalabs/common/irq.c
@@ -0,0 +1,611 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2016-2022 HabanaLabs, Ltd.
+ * All Rights Reserved.
+ */
+
+#include "habanalabs.h"
+
+#include <linux/slab.h>
+
+/**
+ * struct hl_eqe_work - This structure is used to schedule work of EQ
+ *                      entry and cpucp_reset event
+ *
+ * @eq_work:          workqueue object to run when EQ entry is received
+ * @hdev:             pointer to device structure
+ * @eq_entry:         copy of the EQ entry
+ */
+struct hl_eqe_work {
+	struct work_struct	eq_work;
+	struct hl_device	*hdev;
+	struct hl_eq_entry	eq_entry;
+};
+
+/**
+ * hl_cq_inc_ptr - increment ci or pi of cq
+ *
+ * @ptr: the current ci or pi value of the completion queue
+ *
+ * Increment ptr by 1. If it reaches the number of completion queue
+ * entries, set it to 0
+ */
+inline u32 hl_cq_inc_ptr(u32 ptr)
+{
+	ptr++;
+	if (unlikely(ptr == HL_CQ_LENGTH))
+		ptr = 0;
+	return ptr;
+}
+
+/**
+ * hl_eq_inc_ptr - increment ci of eq
+ *
+ * @ptr: the current ci value of the event queue
+ *
+ * Increment ptr by 1. If it reaches the number of event queue
+ * entries, set it to 0
+ */
+static inline u32 hl_eq_inc_ptr(u32 ptr)
+{
+	ptr++;
+	if (unlikely(ptr == HL_EQ_LENGTH))
+		ptr = 0;
+	return ptr;
+}
+
+static void irq_handle_eqe(struct work_struct *work)
+{
+	struct hl_eqe_work *eqe_work = container_of(work, struct hl_eqe_work,
+							eq_work);
+	struct hl_device *hdev = eqe_work->hdev;
+
+	hdev->asic_funcs->handle_eqe(hdev, &eqe_work->eq_entry);
+
+	kfree(eqe_work);
+}
+
+/**
+ * job_finish - queue job finish work
+ *
+ * @hdev: pointer to device structure
+ * @cs_seq: command submission sequence
+ * @cq: completion queue
+ * @timestamp: interrupt timestamp
+ *
+ */
+static void job_finish(struct hl_device *hdev, u32 cs_seq, struct hl_cq *cq, ktime_t timestamp)
+{
+	struct hl_hw_queue *queue;
+	struct hl_cs_job *job;
+
+	queue = &hdev->kernel_queues[cq->hw_queue_id];
+	job = queue->shadow_queue[hl_pi_2_offset(cs_seq)];
+	job->timestamp = timestamp;
+	queue_work(hdev->cq_wq[cq->cq_idx], &job->finish_work);
+
+	atomic_inc(&queue->ci);
+}
+
+/**
+ * cs_finish - queue all cs jobs finish work
+ *
+ * @hdev: pointer to device structure
+ * @cs_seq: command submission sequence
+ * @timestamp: interrupt timestamp
+ *
+ */
+static void cs_finish(struct hl_device *hdev, u16 cs_seq, ktime_t timestamp)
+{
+	struct asic_fixed_properties *prop = &hdev->asic_prop;
+	struct hl_hw_queue *queue;
+	struct hl_cs *cs;
+	struct hl_cs_job *job;
+
+	cs = hdev->shadow_cs_queue[cs_seq & (prop->max_pending_cs - 1)];
+	if (!cs) {
+		dev_warn(hdev->dev,
+			"No pointer to CS in shadow array at index %d\n",
+			cs_seq);
+		return;
+	}
+
+	list_for_each_entry(job, &cs->job_list, cs_node) {
+		queue = &hdev->kernel_queues[job->hw_queue_id];
+		atomic_inc(&queue->ci);
+	}
+
+	cs->completion_timestamp = timestamp;
+	queue_work(hdev->cs_cmplt_wq, &cs->finish_work);
+}
+
+/**
+ * hl_irq_handler_cq - irq handler for completion queue
+ *
+ * @irq: irq number
+ * @arg: pointer to completion queue structure
+ *
+ */
+irqreturn_t hl_irq_handler_cq(int irq, void *arg)
+{
+	struct hl_cq *cq = arg;
+	struct hl_device *hdev = cq->hdev;
+	bool shadow_index_valid, entry_ready;
+	u16 shadow_index;
+	struct hl_cq_entry *cq_entry, *cq_base;
+	ktime_t timestamp = ktime_get();
+
+	if (hdev->disabled) {
+		dev_dbg(hdev->dev,
+			"Device disabled but received IRQ %d for CQ %d\n",
+			irq, cq->hw_queue_id);
+		return IRQ_HANDLED;
+	}
+
+	cq_base = cq->kernel_address;
+
+	while (1) {
+		cq_entry = (struct hl_cq_entry *) &cq_base[cq->ci];
+
+		entry_ready = !!FIELD_GET(CQ_ENTRY_READY_MASK,
+				le32_to_cpu(cq_entry->data));
+		if (!entry_ready)
+			break;
+
+		/* Make sure we read CQ entry contents after we've
+		 * checked the ownership bit.
+		 */
+		dma_rmb();
+
+		shadow_index_valid =
+			!!FIELD_GET(CQ_ENTRY_SHADOW_INDEX_VALID_MASK,
+					le32_to_cpu(cq_entry->data));
+
+		shadow_index = FIELD_GET(CQ_ENTRY_SHADOW_INDEX_MASK,
+				le32_to_cpu(cq_entry->data));
+
+		/*
+		 * CQ interrupt handler has 2 modes of operation:
+		 * 1. Interrupt per CS completion: (Single CQ for all queues)
+		 *    CQ entry represents a completed CS
+		 *
+		 * 2. Interrupt per CS job completion in queue: (CQ per queue)
+		 *    CQ entry represents a completed job in a certain queue
+		 */
+		if (shadow_index_valid && !hdev->disabled) {
+			if (hdev->asic_prop.completion_mode ==
+					HL_COMPLETION_MODE_CS)
+				cs_finish(hdev, shadow_index, timestamp);
+			else
+				job_finish(hdev, shadow_index, cq, timestamp);
+		}
+
+		/* Clear CQ entry ready bit */
+		cq_entry->data = cpu_to_le32(le32_to_cpu(cq_entry->data) &
+						~CQ_ENTRY_READY_MASK);
+
+		cq->ci = hl_cq_inc_ptr(cq->ci);
+
+		/* Increment free slots */
+		atomic_inc(&cq->free_slots_cnt);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * hl_ts_free_objects - handler of the free objects workqueue.
+ * This function should put refcount to objects that the registration node
+ * took refcount to them.
+ * @work: workqueue object pointer
+ */
+static void hl_ts_free_objects(struct work_struct *work)
+{
+	struct timestamp_reg_work_obj *job =
+			container_of(work, struct timestamp_reg_work_obj, free_obj);
+	struct timestamp_reg_free_node *free_obj, *temp_free_obj;
+	struct list_head *free_list_head = job->free_obj_head;
+	struct hl_device *hdev = job->hdev;
+
+	list_for_each_entry_safe(free_obj, temp_free_obj, free_list_head, free_objects_node) {
+		dev_dbg(hdev->dev, "About to put refcount to buf (%p) cq_cb(%p)\n",
+					free_obj->buf,
+					free_obj->cq_cb);
+
+		hl_mmap_mem_buf_put(free_obj->buf);
+		hl_cb_put(free_obj->cq_cb);
+		kfree(free_obj);
+	}
+
+	kfree(free_list_head);
+	kfree(job);
+}
+
+/*
+ * This function called with spin_lock of wait_list_lock taken
+ * This function will set timestamp and delete the registration node from the
+ * wait_list_lock.
+ * and since we're protected with spin_lock here, so we cannot just put the refcount
+ * for the objects here, since the release function may be called and it's also a long
+ * logic (which might sleep also) that cannot be handled in irq context.
+ * so here we'll be filling a list with nodes of "put" jobs and then will send this
+ * list to a dedicated workqueue to do the actual put.
+ */
+static int handle_registration_node(struct hl_device *hdev, struct hl_user_pending_interrupt *pend,
+						struct list_head **free_list, ktime_t now)
+{
+	struct timestamp_reg_free_node *free_node;
+	u64 timestamp;
+
+	if (!(*free_list)) {
+		/* Alloc/Init the timestamp registration free objects list */
+		*free_list = kmalloc(sizeof(struct list_head), GFP_ATOMIC);
+		if (!(*free_list))
+			return -ENOMEM;
+
+		INIT_LIST_HEAD(*free_list);
+	}
+
+	free_node = kmalloc(sizeof(*free_node), GFP_ATOMIC);
+	if (!free_node)
+		return -ENOMEM;
+
+	timestamp = ktime_to_ns(now);
+
+	*pend->ts_reg_info.timestamp_kernel_addr = timestamp;
+
+	dev_dbg(hdev->dev, "Timestamp is set to ts cb address (%p), ts: 0x%llx\n",
+			pend->ts_reg_info.timestamp_kernel_addr,
+			*(u64 *)pend->ts_reg_info.timestamp_kernel_addr);
+
+	list_del(&pend->wait_list_node);
+
+	/* Mark kernel CB node as free */
+	pend->ts_reg_info.in_use = 0;
+
+	/* Putting the refcount for ts_buff and cq_cb objects will be handled
+	 * in workqueue context, just add job to free_list.
+	 */
+	free_node->buf = pend->ts_reg_info.buf;
+	free_node->cq_cb = pend->ts_reg_info.cq_cb;
+	list_add(&free_node->free_objects_node, *free_list);
+
+	return 0;
+}
+
+static void handle_user_interrupt(struct hl_device *hdev, struct hl_user_interrupt *intr)
+{
+	struct hl_user_pending_interrupt *pend, *temp_pend;
+	struct list_head *ts_reg_free_list_head = NULL;
+	struct timestamp_reg_work_obj *job;
+	bool reg_node_handle_fail = false;
+	int rc;
+
+	/* For registration nodes:
+	 * As part of handling the registration nodes, we should put refcount to
+	 * some objects. the problem is that we cannot do that under spinlock
+	 * or in irq handler context at all (since release functions are long and
+	 * might sleep), so we will need to handle that part in workqueue context.
+	 * To avoid handling kmalloc failure which compels us rolling back actions
+	 * and move nodes hanged on the free list back to the interrupt wait list
+	 * we always alloc the job of the WQ at the beginning.
+	 */
+	job = kmalloc(sizeof(*job), GFP_ATOMIC);
+	if (!job)
+		return;
+
+	spin_lock(&intr->wait_list_lock);
+	list_for_each_entry_safe(pend, temp_pend, &intr->wait_list_head, wait_list_node) {
+		if ((pend->cq_kernel_addr && *(pend->cq_kernel_addr) >= pend->cq_target_value) ||
+				!pend->cq_kernel_addr) {
+			if (pend->ts_reg_info.buf) {
+				if (!reg_node_handle_fail) {
+					rc = handle_registration_node(hdev, pend,
+							&ts_reg_free_list_head, intr->timestamp);
+					if (rc)
+						reg_node_handle_fail = true;
+				}
+			} else {
+				/* Handle wait target value node */
+				pend->fence.timestamp = intr->timestamp;
+				complete_all(&pend->fence.completion);
+			}
+		}
+	}
+	spin_unlock(&intr->wait_list_lock);
+
+	if (ts_reg_free_list_head) {
+		INIT_WORK(&job->free_obj, hl_ts_free_objects);
+		job->free_obj_head = ts_reg_free_list_head;
+		job->hdev = hdev;
+		queue_work(hdev->ts_free_obj_wq, &job->free_obj);
+	} else {
+		kfree(job);
+	}
+}
+
+static void handle_tpc_interrupt(struct hl_device *hdev)
+{
+	u64 event_mask;
+	u32 flags;
+
+	event_mask = HL_NOTIFIER_EVENT_TPC_ASSERT |
+		HL_NOTIFIER_EVENT_USER_ENGINE_ERR |
+		HL_NOTIFIER_EVENT_DEVICE_RESET;
+
+	flags = HL_DRV_RESET_DELAY;
+
+	dev_err_ratelimited(hdev->dev, "Received TPC assert\n");
+	hl_device_cond_reset(hdev, flags, event_mask);
+}
+
+static void handle_unexpected_user_interrupt(struct hl_device *hdev)
+{
+	dev_err_ratelimited(hdev->dev, "Received unexpected user error interrupt\n");
+}
+
+/**
+ * hl_irq_handler_user_interrupt - irq handler for user interrupts
+ *
+ * @irq: irq number
+ * @arg: pointer to user interrupt structure
+ *
+ */
+irqreturn_t hl_irq_handler_user_interrupt(int irq, void *arg)
+{
+	struct hl_user_interrupt *user_int = arg;
+
+	user_int->timestamp = ktime_get();
+
+	return IRQ_WAKE_THREAD;
+}
+
+/**
+ * hl_irq_user_interrupt_thread_handler - irq thread handler for user interrupts.
+ * This function is invoked by threaded irq mechanism
+ *
+ * @irq: irq number
+ * @arg: pointer to user interrupt structure
+ *
+ */
+irqreturn_t hl_irq_user_interrupt_thread_handler(int irq, void *arg)
+{
+	struct hl_user_interrupt *user_int = arg;
+	struct hl_device *hdev = user_int->hdev;
+
+	switch (user_int->type) {
+	case HL_USR_INTERRUPT_CQ:
+		handle_user_interrupt(hdev, &hdev->common_user_cq_interrupt);
+
+		/* Handle user cq interrupt registered on this specific irq */
+		handle_user_interrupt(hdev, user_int);
+		break;
+	case HL_USR_INTERRUPT_DECODER:
+		handle_user_interrupt(hdev, &hdev->common_decoder_interrupt);
+
+		/* Handle decoder interrupt registered on this specific irq */
+		handle_user_interrupt(hdev, user_int);
+		break;
+	case HL_USR_INTERRUPT_TPC:
+		handle_tpc_interrupt(hdev);
+		break;
+	case HL_USR_INTERRUPT_UNEXPECTED:
+		handle_unexpected_user_interrupt(hdev);
+		break;
+	default:
+		break;
+	}
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * hl_irq_handler_eq - irq handler for event queue
+ *
+ * @irq: irq number
+ * @arg: pointer to event queue structure
+ *
+ */
+irqreturn_t hl_irq_handler_eq(int irq, void *arg)
+{
+	struct hl_eq *eq = arg;
+	struct hl_device *hdev = eq->hdev;
+	struct hl_eq_entry *eq_entry;
+	struct hl_eq_entry *eq_base;
+	struct hl_eqe_work *handle_eqe_work;
+	bool entry_ready;
+	u32 cur_eqe, ctl;
+	u16 cur_eqe_index, event_type;
+
+	eq_base = eq->kernel_address;
+
+	while (1) {
+		cur_eqe = le32_to_cpu(eq_base[eq->ci].hdr.ctl);
+		entry_ready = !!FIELD_GET(EQ_CTL_READY_MASK, cur_eqe);
+
+		if (!entry_ready)
+			break;
+
+		cur_eqe_index = FIELD_GET(EQ_CTL_INDEX_MASK, cur_eqe);
+		if ((hdev->event_queue.check_eqe_index) &&
+				(((eq->prev_eqe_index + 1) & EQ_CTL_INDEX_MASK) != cur_eqe_index)) {
+			dev_err(hdev->dev,
+				"EQE %#x in queue is ready but index does not match %d!=%d",
+				cur_eqe,
+				((eq->prev_eqe_index + 1) & EQ_CTL_INDEX_MASK),
+				cur_eqe_index);
+			break;
+		}
+
+		eq->prev_eqe_index++;
+
+		eq_entry = &eq_base[eq->ci];
+
+		/*
+		 * Make sure we read EQ entry contents after we've
+		 * checked the ownership bit.
+		 */
+		dma_rmb();
+
+		if (hdev->disabled && !hdev->reset_info.in_compute_reset) {
+			ctl = le32_to_cpu(eq_entry->hdr.ctl);
+			event_type = ((ctl & EQ_CTL_EVENT_TYPE_MASK) >> EQ_CTL_EVENT_TYPE_SHIFT);
+			dev_warn(hdev->dev,
+				"Device disabled but received an EQ event (%u)\n", event_type);
+			goto skip_irq;
+		}
+
+		handle_eqe_work = kmalloc(sizeof(*handle_eqe_work), GFP_ATOMIC);
+		if (handle_eqe_work) {
+			INIT_WORK(&handle_eqe_work->eq_work, irq_handle_eqe);
+			handle_eqe_work->hdev = hdev;
+
+			memcpy(&handle_eqe_work->eq_entry, eq_entry,
+					sizeof(*eq_entry));
+
+			queue_work(hdev->eq_wq, &handle_eqe_work->eq_work);
+		}
+skip_irq:
+		/* Clear EQ entry ready bit */
+		eq_entry->hdr.ctl =
+			cpu_to_le32(le32_to_cpu(eq_entry->hdr.ctl) &
+							~EQ_CTL_READY_MASK);
+
+		eq->ci = hl_eq_inc_ptr(eq->ci);
+
+		hdev->asic_funcs->update_eq_ci(hdev, eq->ci);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * hl_irq_handler_dec_abnrm - Decoder error interrupt handler
+ * @irq: IRQ number
+ * @arg: pointer to decoder structure.
+ */
+irqreturn_t hl_irq_handler_dec_abnrm(int irq, void *arg)
+{
+	struct hl_dec *dec = arg;
+
+	schedule_work(&dec->abnrm_intr_work);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * hl_cq_init - main initialization function for an cq object
+ *
+ * @hdev: pointer to device structure
+ * @q: pointer to cq structure
+ * @hw_queue_id: The H/W queue ID this completion queue belongs to
+ *               HL_INVALID_QUEUE if cq is not attached to any specific queue
+ *
+ * Allocate dma-able memory for the completion queue and initialize fields
+ * Returns 0 on success
+ */
+int hl_cq_init(struct hl_device *hdev, struct hl_cq *q, u32 hw_queue_id)
+{
+	void *p;
+
+	p = hl_asic_dma_alloc_coherent(hdev, HL_CQ_SIZE_IN_BYTES, &q->bus_address,
+					GFP_KERNEL | __GFP_ZERO);
+	if (!p)
+		return -ENOMEM;
+
+	q->hdev = hdev;
+	q->kernel_address = p;
+	q->hw_queue_id = hw_queue_id;
+	q->ci = 0;
+	q->pi = 0;
+
+	atomic_set(&q->free_slots_cnt, HL_CQ_LENGTH);
+
+	return 0;
+}
+
+/**
+ * hl_cq_fini - destroy completion queue
+ *
+ * @hdev: pointer to device structure
+ * @q: pointer to cq structure
+ *
+ * Free the completion queue memory
+ */
+void hl_cq_fini(struct hl_device *hdev, struct hl_cq *q)
+{
+	hl_asic_dma_free_coherent(hdev, HL_CQ_SIZE_IN_BYTES, q->kernel_address, q->bus_address);
+}
+
+void hl_cq_reset(struct hl_device *hdev, struct hl_cq *q)
+{
+	q->ci = 0;
+	q->pi = 0;
+
+	atomic_set(&q->free_slots_cnt, HL_CQ_LENGTH);
+
+	/*
+	 * It's not enough to just reset the PI/CI because the H/W may have
+	 * written valid completion entries before it was halted and therefore
+	 * we need to clean the actual queues so we won't process old entries
+	 * when the device is operational again
+	 */
+
+	memset(q->kernel_address, 0, HL_CQ_SIZE_IN_BYTES);
+}
+
+/**
+ * hl_eq_init - main initialization function for an event queue object
+ *
+ * @hdev: pointer to device structure
+ * @q: pointer to eq structure
+ *
+ * Allocate dma-able memory for the event queue and initialize fields
+ * Returns 0 on success
+ */
+int hl_eq_init(struct hl_device *hdev, struct hl_eq *q)
+{
+	void *p;
+
+	p = hl_cpu_accessible_dma_pool_alloc(hdev, HL_EQ_SIZE_IN_BYTES, &q->bus_address);
+	if (!p)
+		return -ENOMEM;
+
+	q->hdev = hdev;
+	q->kernel_address = p;
+	q->ci = 0;
+	q->prev_eqe_index = 0;
+
+	return 0;
+}
+
+/**
+ * hl_eq_fini - destroy event queue
+ *
+ * @hdev: pointer to device structure
+ * @q: pointer to eq structure
+ *
+ * Free the event queue memory
+ */
+void hl_eq_fini(struct hl_device *hdev, struct hl_eq *q)
+{
+	flush_workqueue(hdev->eq_wq);
+
+	hl_cpu_accessible_dma_pool_free(hdev, HL_EQ_SIZE_IN_BYTES, q->kernel_address);
+}
+
+void hl_eq_reset(struct hl_device *hdev, struct hl_eq *q)
+{
+	q->ci = 0;
+	q->prev_eqe_index = 0;
+
+	/*
+	 * It's not enough to just reset the PI/CI because the H/W may have
+	 * written valid completion entries before it was halted and therefore
+	 * we need to clean the actual queues so we won't process old entries
+	 * when the device is operational again
+	 */
+
+	memset(q->kernel_address, 0, HL_EQ_SIZE_IN_BYTES);
+}