accel/ivpu: Use threaded IRQ to handle JOB done messages

Remove job_done thread and replace it with generic callback based
mechanism.

Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231113170252.758137-6-jacek.lawrynowicz@linux.intel.com

1 files changed, 111 insertions, 85 deletions

diff --git a/drivers/accel/ivpu/ivpu_ipc.c b/drivers/accel/ivpu/ivpu_ipc.c
index 1dd4413dc88f..e86621f16f85 100644
--- a/drivers/accel/ivpu/ivpu_ipc.c
+++ b/drivers/accel/ivpu/ivpu_ipc.c
@@ -5,7 +5,6 @@
 
 #include <linux/genalloc.h>
 #include <linux/highmem.h>
-#include <linux/kthread.h>
 #include <linux/pm_runtime.h>
 #include <linux/wait.h>
 
@@ -18,19 +17,12 @@
 #include "ivpu_pm.h"
 
 #define IPC_MAX_RX_MSG	128
-#define IS_KTHREAD()	(get_current()->flags & PF_KTHREAD)
 
 struct ivpu_ipc_tx_buf {
 	struct ivpu_ipc_hdr ipc;
 	struct vpu_jsm_msg jsm;
 };
 
-struct ivpu_ipc_rx_msg {
-	struct list_head link;
-	struct ivpu_ipc_hdr *ipc_hdr;
-	struct vpu_jsm_msg *jsm_msg;
-};
-
 static void ivpu_ipc_msg_dump(struct ivpu_device *vdev, char *c,
 			      struct ivpu_ipc_hdr *ipc_hdr, u32 vpu_addr)
 {
@@ -140,8 +132,49 @@ static void ivpu_ipc_tx(struct ivpu_device *vdev, u32 vpu_addr)
 	ivpu_hw_reg_ipc_tx_set(vdev, vpu_addr);
 }
 
-void
-ivpu_ipc_consumer_add(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons, u32 channel)
+static void
+ivpu_ipc_rx_msg_add(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons,
+		    struct ivpu_ipc_hdr *ipc_hdr, struct vpu_jsm_msg *jsm_msg)
+{
+	struct ivpu_ipc_info *ipc = vdev->ipc;
+	struct ivpu_ipc_rx_msg *rx_msg;
+
+	lockdep_assert_held(&ipc->cons_lock);
+	lockdep_assert_irqs_disabled();
+
+	rx_msg = kzalloc(sizeof(*rx_msg), GFP_ATOMIC);
+	if (!rx_msg) {
+		ivpu_ipc_rx_mark_free(vdev, ipc_hdr, jsm_msg);
+		return;
+	}
+
+	atomic_inc(&ipc->rx_msg_count);
+
+	rx_msg->ipc_hdr = ipc_hdr;
+	rx_msg->jsm_msg = jsm_msg;
+	rx_msg->callback = cons->rx_callback;
+
+	if (rx_msg->callback) {
+		list_add_tail(&rx_msg->link, &ipc->cb_msg_list);
+	} else {
+		spin_lock(&cons->rx_lock);
+		list_add_tail(&rx_msg->link, &cons->rx_msg_list);
+		spin_unlock(&cons->rx_lock);
+		wake_up(&cons->rx_msg_wq);
+	}
+}
+
+static void
+ivpu_ipc_rx_msg_del(struct ivpu_device *vdev, struct ivpu_ipc_rx_msg *rx_msg)
+{
+	list_del(&rx_msg->link);
+	ivpu_ipc_rx_mark_free(vdev, rx_msg->ipc_hdr, rx_msg->jsm_msg);
+	atomic_dec(&vdev->ipc->rx_msg_count);
+	kfree(rx_msg);
+}
+
+void ivpu_ipc_consumer_add(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons,
+			   u32 channel, ivpu_ipc_rx_callback_t rx_callback)
 {
 	struct ivpu_ipc_info *ipc = vdev->ipc;
 
@@ -150,13 +183,14 @@ ivpu_ipc_consumer_add(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons,
 	cons->tx_vpu_addr = 0;
 	cons->request_id = 0;
 	cons->aborted = false;
+	cons->rx_callback = rx_callback;
 	spin_lock_init(&cons->rx_lock);
 	INIT_LIST_HEAD(&cons->rx_msg_list);
 	init_waitqueue_head(&cons->rx_msg_wq);
 
-	spin_lock_irq(&ipc->cons_list_lock);
+	spin_lock_irq(&ipc->cons_lock);
 	list_add_tail(&cons->link, &ipc->cons_list);
-	spin_unlock_irq(&ipc->cons_list_lock);
+	spin_unlock_irq(&ipc->cons_lock);
 }
 
 void ivpu_ipc_consumer_del(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons)
@@ -164,18 +198,13 @@ void ivpu_ipc_consumer_del(struct ivpu_device *vdev, struct ivpu_ipc_consumer *c
 	struct ivpu_ipc_info *ipc = vdev->ipc;
 	struct ivpu_ipc_rx_msg *rx_msg, *r;
 
-	spin_lock_irq(&ipc->cons_list_lock);
+	spin_lock_irq(&ipc->cons_lock);
 	list_del(&cons->link);
-	spin_unlock_irq(&ipc->cons_list_lock);
+	spin_unlock_irq(&ipc->cons_lock);
 
 	spin_lock_irq(&cons->rx_lock);
-	list_for_each_entry_safe(rx_msg, r, &cons->rx_msg_list, link) {
-		list_del(&rx_msg->link);
-		if (!cons->aborted)
-			ivpu_ipc_rx_mark_free(vdev, rx_msg->ipc_hdr, rx_msg->jsm_msg);
-		atomic_dec(&ipc->rx_msg_count);
-		kfree(rx_msg);
-	}
+	list_for_each_entry_safe(rx_msg, r, &cons->rx_msg_list, link)
+		ivpu_ipc_rx_msg_del(vdev, rx_msg);
 	spin_unlock_irq(&cons->rx_lock);
 
 	ivpu_ipc_tx_release(vdev, cons->tx_vpu_addr);
@@ -205,15 +234,12 @@ unlock:
 	return ret;
 }
 
-static int ivpu_ipc_rx_need_wakeup(struct ivpu_ipc_consumer *cons)
+static bool ivpu_ipc_rx_need_wakeup(struct ivpu_ipc_consumer *cons)
 {
-	int ret = 0;
-
-	if (IS_KTHREAD())
-		ret |= (kthread_should_stop() || kthread_should_park());
+	bool ret;
 
 	spin_lock_irq(&cons->rx_lock);
-	ret |= !list_empty(&cons->rx_msg_list) || cons->aborted;
+	ret = !list_empty(&cons->rx_msg_list) || cons->aborted;
 	spin_unlock_irq(&cons->rx_lock);
 
 	return ret;
@@ -221,19 +247,18 @@ static int ivpu_ipc_rx_need_wakeup(struct ivpu_ipc_consumer *cons)
 
 int ivpu_ipc_receive(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons,
 		     struct ivpu_ipc_hdr *ipc_buf,
-		     struct vpu_jsm_msg *ipc_payload, unsigned long timeout_ms)
+		     struct vpu_jsm_msg *jsm_msg, unsigned long timeout_ms)
 {
-	struct ivpu_ipc_info *ipc = vdev->ipc;
 	struct ivpu_ipc_rx_msg *rx_msg;
 	int wait_ret, ret = 0;
 
+	if (drm_WARN_ONCE(&vdev->drm, cons->rx_callback, "Consumer works only in async mode\n"))
+		return -EINVAL;
+
 	wait_ret = wait_event_timeout(cons->rx_msg_wq,
 				      ivpu_ipc_rx_need_wakeup(cons),
 				      msecs_to_jiffies(timeout_ms));
 
-	if (IS_KTHREAD() && kthread_should_stop())
-		return -EINTR;
-
 	if (wait_ret == 0)
 		return -ETIMEDOUT;
 
@@ -247,27 +272,23 @@ int ivpu_ipc_receive(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons,
 		spin_unlock_irq(&cons->rx_lock);
 		return -EAGAIN;
 	}
-	list_del(&rx_msg->link);
-	spin_unlock_irq(&cons->rx_lock);
 
 	if (ipc_buf)
 		memcpy(ipc_buf, rx_msg->ipc_hdr, sizeof(*ipc_buf));
 	if (rx_msg->jsm_msg) {
-		u32 size = min_t(int, rx_msg->ipc_hdr->data_size, sizeof(*ipc_payload));
+		u32 size = min_t(int, rx_msg->ipc_hdr->data_size, sizeof(*jsm_msg));
 
 		if (rx_msg->jsm_msg->result != VPU_JSM_STATUS_SUCCESS) {
 			ivpu_dbg(vdev, IPC, "IPC resp result error: %d\n", rx_msg->jsm_msg->result);
 			ret = -EBADMSG;
 		}
 
-		if (ipc_payload)
-			memcpy(ipc_payload, rx_msg->jsm_msg, size);
+		if (jsm_msg)
+			memcpy(jsm_msg, rx_msg->jsm_msg, size);
 	}
 
-	ivpu_ipc_rx_mark_free(vdev, rx_msg->ipc_hdr, rx_msg->jsm_msg);
-	atomic_dec(&ipc->rx_msg_count);
-	kfree(rx_msg);
-
+	ivpu_ipc_rx_msg_del(vdev, rx_msg);
+	spin_unlock_irq(&cons->rx_lock);
 	return ret;
 }
 
@@ -280,7 +301,7 @@ ivpu_ipc_send_receive_internal(struct ivpu_device *vdev, struct vpu_jsm_msg *req
 	struct ivpu_ipc_consumer cons;
 	int ret;
 
-	ivpu_ipc_consumer_add(vdev, &cons, channel);
+	ivpu_ipc_consumer_add(vdev, &cons, channel, NULL);
 
 	ret = ivpu_ipc_send(vdev, &cons, req);
 	if (ret) {
@@ -359,35 +380,7 @@ ivpu_ipc_match_consumer(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons
 	return false;
 }
 
-static void
-ivpu_ipc_dispatch(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons,
-		  struct ivpu_ipc_hdr *ipc_hdr, struct vpu_jsm_msg *jsm_msg)
-{
-	struct ivpu_ipc_info *ipc = vdev->ipc;
-	struct ivpu_ipc_rx_msg *rx_msg;
-
-	lockdep_assert_held(&ipc->cons_list_lock);
-	lockdep_assert_irqs_disabled();
-
-	rx_msg = kzalloc(sizeof(*rx_msg), GFP_ATOMIC);
-	if (!rx_msg) {
-		ivpu_ipc_rx_mark_free(vdev, ipc_hdr, jsm_msg);
-		return;
-	}
-
-	atomic_inc(&ipc->rx_msg_count);
-
-	rx_msg->ipc_hdr = ipc_hdr;
-	rx_msg->jsm_msg = jsm_msg;
-
-	spin_lock(&cons->rx_lock);
-	list_add_tail(&rx_msg->link, &cons->rx_msg_list);
-	spin_unlock(&cons->rx_lock);
-
-	wake_up(&cons->rx_msg_wq);
-}
-
-int ivpu_ipc_irq_handler(struct ivpu_device *vdev)
+void ivpu_ipc_irq_handler(struct ivpu_device *vdev, bool *wake_thread)
 {
 	struct ivpu_ipc_info *ipc = vdev->ipc;
 	struct ivpu_ipc_consumer *cons;
@@ -405,7 +398,7 @@ int ivpu_ipc_irq_handler(struct ivpu_device *vdev)
 		vpu_addr = ivpu_hw_reg_ipc_rx_addr_get(vdev);
 		if (vpu_addr == REG_IO_ERROR) {
 			ivpu_err_ratelimited(vdev, "Failed to read IPC rx addr register\n");
-			return -EIO;
+			return;
 		}
 
 		ipc_hdr = ivpu_to_cpu_addr(ipc->mem_rx, vpu_addr);
@@ -435,15 +428,15 @@ int ivpu_ipc_irq_handler(struct ivpu_device *vdev)
 		}
 
 		dispatched = false;
-		spin_lock_irqsave(&ipc->cons_list_lock, flags);
+		spin_lock_irqsave(&ipc->cons_lock, flags);
 		list_for_each_entry(cons, &ipc->cons_list, link) {
 			if (ivpu_ipc_match_consumer(vdev, cons, ipc_hdr, jsm_msg)) {
-				ivpu_ipc_dispatch(vdev, cons, ipc_hdr, jsm_msg);
+				ivpu_ipc_rx_msg_add(vdev, cons, ipc_hdr, jsm_msg);
 				dispatched = true;
 				break;
 			}
 		}
-		spin_unlock_irqrestore(&ipc->cons_list_lock, flags);
+		spin_unlock_irqrestore(&ipc->cons_lock, flags);
 
 		if (!dispatched) {
 			ivpu_dbg(vdev, IPC, "IPC RX msg 0x%x dropped (no consumer)\n", vpu_addr);
@@ -451,7 +444,28 @@ int ivpu_ipc_irq_handler(struct ivpu_device *vdev)
 		}
 	}
 
-	return 0;
+	if (wake_thread)
+		*wake_thread = !list_empty(&ipc->cb_msg_list);
+}
+
+irqreturn_t ivpu_ipc_irq_thread_handler(struct ivpu_device *vdev)
+{
+	struct ivpu_ipc_info *ipc = vdev->ipc;
+	struct ivpu_ipc_rx_msg *rx_msg, *r;
+	struct list_head cb_msg_list;
+
+	INIT_LIST_HEAD(&cb_msg_list);
+
+	spin_lock_irq(&ipc->cons_lock);
+	list_splice_tail_init(&ipc->cb_msg_list, &cb_msg_list);
+	spin_unlock_irq(&ipc->cons_lock);
+
+	list_for_each_entry_safe(rx_msg, r, &cb_msg_list, link) {
+		rx_msg->callback(vdev, rx_msg->ipc_hdr, rx_msg->jsm_msg);
+		ivpu_ipc_rx_msg_del(vdev, rx_msg);
+	}
+
+	return IRQ_HANDLED;
 }
 
 int ivpu_ipc_init(struct ivpu_device *vdev)
@@ -486,10 +500,10 @@ int ivpu_ipc_init(struct ivpu_device *vdev)
 		goto err_free_rx;
 	}
 
+	spin_lock_init(&ipc->cons_lock);
 	INIT_LIST_HEAD(&ipc->cons_list);
-	spin_lock_init(&ipc->cons_list_lock);
+	INIT_LIST_HEAD(&ipc->cb_msg_list);
 	drmm_mutex_init(&vdev->drm, &ipc->lock);
-
 	ivpu_ipc_reset(vdev);
 	return 0;
 
@@ -502,6 +516,13 @@ err_free_tx:
 
 void ivpu_ipc_fini(struct ivpu_device *vdev)
 {
+	struct ivpu_ipc_info *ipc = vdev->ipc;
+
+	drm_WARN_ON(&vdev->drm, ipc->on);
+	drm_WARN_ON(&vdev->drm, !list_empty(&ipc->cons_list));
+	drm_WARN_ON(&vdev->drm, !list_empty(&ipc->cb_msg_list));
+	drm_WARN_ON(&vdev->drm, atomic_read(&ipc->rx_msg_count) > 0);
+
 	ivpu_ipc_mem_fini(vdev);
 }
 
@@ -518,22 +539,27 @@ void ivpu_ipc_disable(struct ivpu_device *vdev)
 {
 	struct ivpu_ipc_info *ipc = vdev->ipc;
 	struct ivpu_ipc_consumer *cons, *c;
-	unsigned long flags;
+	struct ivpu_ipc_rx_msg *rx_msg, *r;
+
+	drm_WARN_ON(&vdev->drm, !list_empty(&ipc->cb_msg_list));
 
 	mutex_lock(&ipc->lock);
 	ipc->on = false;
 	mutex_unlock(&ipc->lock);
 
-	spin_lock_irqsave(&ipc->cons_list_lock, flags);
+	spin_lock_irq(&ipc->cons_lock);
 	list_for_each_entry_safe(cons, c, &ipc->cons_list, link) {
-		if (cons->channel != VPU_IPC_CHAN_JOB_RET) {
-			spin_lock(&cons->rx_lock);
+		spin_lock(&cons->rx_lock);
+		if (!cons->rx_callback)
 			cons->aborted = true;
-			spin_unlock(&cons->rx_lock);
-		}
+		list_for_each_entry_safe(rx_msg, r, &cons->rx_msg_list, link)
+			ivpu_ipc_rx_msg_del(vdev, rx_msg);
+		spin_unlock(&cons->rx_lock);
 		wake_up(&cons->rx_msg_wq);
 	}
-	spin_unlock_irqrestore(&ipc->cons_list_lock, flags);
+	spin_unlock_irq(&ipc->cons_lock);
+
+	drm_WARN_ON(&vdev->drm, atomic_read(&ipc->rx_msg_count) > 0);
 }
 
 void ivpu_ipc_reset(struct ivpu_device *vdev)