Convert IRQ bottom half from the thread handler into workqueue.
This increases a stability in rare scenarios where driver on
debugging/hardening kernels processes IRQ too slow and misses
some interrupts due to it.
Workqueue handler also gives a very minor performance increase.
Signed-off-by: Maciej Falkowski <maciej.falkowski@xxxxxxxxxxxxxxx>
---
drivers/accel/ivpu/ivpu_drv.c | 39 ++++++++-----------------------
drivers/accel/ivpu/ivpu_drv.h | 5 +++-
drivers/accel/ivpu/ivpu_hw.c | 5 ----
drivers/accel/ivpu/ivpu_hw.h | 9 -------
drivers/accel/ivpu/ivpu_hw_btrs.c | 3 +--
drivers/accel/ivpu/ivpu_ipc.c | 7 +++---
drivers/accel/ivpu/ivpu_ipc.h | 2 +-
drivers/accel/ivpu/ivpu_job.c | 2 +-
drivers/accel/ivpu/ivpu_job.h | 2 +-
drivers/accel/ivpu/ivpu_pm.c | 3 ++-
drivers/accel/ivpu/ivpu_pm.h | 2 +-
11 files changed, 24 insertions(+), 55 deletions(-)
diff --git a/drivers/accel/ivpu/ivpu_drv.c b/drivers/accel/ivpu/ivpu_drv.c
index 300eea8c305f..9b0d99873fb3 100644
--- a/drivers/accel/ivpu/ivpu_drv.c
+++ b/drivers/accel/ivpu/ivpu_drv.c
@@ -7,6 +7,7 @@
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
+#include <linux/workqueue.h>
#include <generated/utsrelease.h>
#include <drm/drm_accel.h>
@@ -421,6 +422,9 @@ void ivpu_prepare_for_reset(struct ivpu_device *vdev)
{
ivpu_hw_irq_disable(vdev);
disable_irq(vdev->irq);
+ cancel_work_sync(&vdev->irq_ipc_work);
+ cancel_work_sync(&vdev->irq_dct_work);
+ cancel_work_sync(&vdev->context_abort_work);
ivpu_ipc_disable(vdev);
ivpu_mmu_disable(vdev);
}
@@ -465,31 +469,6 @@ static const struct drm_driver driver = {
.major = 1,
};
-static irqreturn_t ivpu_irq_thread_handler(int irq, void *arg)
-{
- struct ivpu_device *vdev = arg;
- u8 irq_src;
-
- if (kfifo_is_empty(&vdev->hw->irq.fifo))
- return IRQ_NONE;
-
- while (kfifo_get(&vdev->hw->irq.fifo, &irq_src)) {
- switch (irq_src) {
- case IVPU_HW_IRQ_SRC_IPC:
- ivpu_ipc_irq_thread_handler(vdev);
- break;
- case IVPU_HW_IRQ_SRC_DCT:
- ivpu_pm_dct_irq_thread_handler(vdev);
- break;
- default:
- ivpu_err_ratelimited(vdev, "Unknown IRQ source: %u\n", irq_src);
- break;
- }
- }
-
- return IRQ_HANDLED;
-}
-
static int ivpu_irq_init(struct ivpu_device *vdev)
{
struct pci_dev *pdev = to_pci_dev(vdev->drm.dev);
@@ -501,12 +480,16 @@ static int ivpu_irq_init(struct ivpu_device *vdev)
return ret;
}
+ INIT_WORK(&vdev->irq_ipc_work, ivpu_ipc_irq_work_fn);
+ INIT_WORK(&vdev->irq_dct_work, ivpu_pm_irq_dct_work_fn);
+ INIT_WORK(&vdev->context_abort_work, ivpu_context_abort_work_fn);
+
ivpu_irq_handlers_init(vdev);
vdev->irq = pci_irq_vector(pdev, 0);
- ret = devm_request_threaded_irq(vdev->drm.dev, vdev->irq, ivpu_hw_irq_handler,
- ivpu_irq_thread_handler, IRQF_NO_AUTOEN, DRIVER_NAME, vdev);
+ ret = devm_request_irq(vdev->drm.dev, vdev->irq, ivpu_hw_irq_handler,
+ IRQF_NO_AUTOEN, DRIVER_NAME, vdev);
if (ret)
ivpu_err(vdev, "Failed to request an IRQ %d\n", ret);
@@ -599,8 +582,6 @@ static int ivpu_dev_init(struct ivpu_device *vdev)
vdev->db_limit.min = IVPU_MIN_DB;
vdev->db_limit.max = IVPU_MAX_DB;
- INIT_WORK(&vdev->context_abort_work, ivpu_context_abort_thread_handler);
-
ret = drmm_mutex_init(&vdev->drm, &vdev->context_list_lock);
if (ret)
goto err_xa_destroy;
diff --git a/drivers/accel/ivpu/ivpu_drv.h b/drivers/accel/ivpu/ivpu_drv.h
index ebfcf3e42a3d..b57d878f2fcd 100644
--- a/drivers/accel/ivpu/ivpu_drv.h
+++ b/drivers/accel/ivpu/ivpu_drv.h
@@ -137,12 +137,15 @@ struct ivpu_device {
struct mutex context_list_lock; /* Protects user context addition/removal */
struct xarray context_xa;
struct xa_limit context_xa_limit;
- struct work_struct context_abort_work;
struct xarray db_xa;
struct xa_limit db_limit;
u32 db_next;
+ struct work_struct irq_ipc_work;
+ struct work_struct irq_dct_work;
+ struct work_struct context_abort_work;
+
struct mutex bo_list_lock; /* Protects bo_list */
struct list_head bo_list;
diff --git a/drivers/accel/ivpu/ivpu_hw.c b/drivers/accel/ivpu/ivpu_hw.c
index 4e1054f3466e..1b691375ee4d 100644
--- a/drivers/accel/ivpu/ivpu_hw.c
+++ b/drivers/accel/ivpu/ivpu_hw.c
@@ -285,8 +285,6 @@ void ivpu_hw_profiling_freq_drive(struct ivpu_device *vdev, bool enable)
void ivpu_irq_handlers_init(struct ivpu_device *vdev)
{
- INIT_KFIFO(vdev->hw->irq.fifo);
-
if (ivpu_hw_ip_gen(vdev) == IVPU_HW_IP_37XX)
vdev->hw->irq.ip_irq_handler = ivpu_hw_ip_irq_handler_37xx;
else
@@ -300,7 +298,6 @@ void ivpu_irq_handlers_init(struct ivpu_device *vdev)
void ivpu_hw_irq_enable(struct ivpu_device *vdev)
{
- kfifo_reset(&vdev->hw->irq.fifo);
ivpu_hw_ip_irq_enable(vdev);
ivpu_hw_btrs_irq_enable(vdev);
}
@@ -327,8 +324,6 @@ irqreturn_t ivpu_hw_irq_handler(int irq, void *ptr)
/* Re-enable global interrupts to re-trigger MSI for pending interrupts */
ivpu_hw_btrs_global_int_enable(vdev);
- if (!kfifo_is_empty(&vdev->hw->irq.fifo))
- return IRQ_WAKE_THREAD;
if (ip_handled || btrs_handled)
return IRQ_HANDLED;
return IRQ_NONE;
diff --git a/drivers/accel/ivpu/ivpu_hw.h b/drivers/accel/ivpu/ivpu_hw.h
index fc4dbfc980c8..fbef9816b9d0 100644
--- a/drivers/accel/ivpu/ivpu_hw.h
+++ b/drivers/accel/ivpu/ivpu_hw.h
@@ -6,18 +6,10 @@
#ifndef __IVPU_HW_H__
#define __IVPU_HW_H__
-#include <linux/kfifo.h>
-
#include "ivpu_drv.h"
#include "ivpu_hw_btrs.h"
#include "ivpu_hw_ip.h"
-#define IVPU_HW_IRQ_FIFO_LENGTH 1024
-
-#define IVPU_HW_IRQ_SRC_IPC 1
-#define IVPU_HW_IRQ_SRC_MMU_EVTQ 2
-#define IVPU_HW_IRQ_SRC_DCT 3
-
struct ivpu_addr_range {
resource_size_t start;
resource_size_t end;
@@ -27,7 +19,6 @@ struct ivpu_hw_info {
struct {
bool (*btrs_irq_handler)(struct ivpu_device *vdev, int irq);
bool (*ip_irq_handler)(struct ivpu_device *vdev, int irq);
- DECLARE_KFIFO(fifo, u8, IVPU_HW_IRQ_FIFO_LENGTH);
} irq;
struct {
struct ivpu_addr_range global;
diff --git a/drivers/accel/ivpu/ivpu_hw_btrs.c b/drivers/accel/ivpu/ivpu_hw_btrs.c
index 3212c99f3682..3753b00ed2d6 100644
--- a/drivers/accel/ivpu/ivpu_hw_btrs.c
+++ b/drivers/accel/ivpu/ivpu_hw_btrs.c
@@ -630,8 +630,7 @@ bool ivpu_hw_btrs_irq_handler_lnl(struct ivpu_device *vdev, int irq)
if (REG_TEST_FLD(VPU_HW_BTRS_LNL_INTERRUPT_STAT, SURV_ERR, status)) {
ivpu_dbg(vdev, IRQ, "Survivability IRQ\n");
- if (!kfifo_put(&vdev->hw->irq.fifo, IVPU_HW_IRQ_SRC_DCT))
- ivpu_err_ratelimited(vdev, "IRQ FIFO full\n");
+ queue_work(system_wq, &vdev->irq_dct_work);
}
if (REG_TEST_FLD(VPU_HW_BTRS_LNL_INTERRUPT_STAT, FREQ_CHANGE, status))
diff --git a/drivers/accel/ivpu/ivpu_ipc.c b/drivers/accel/ivpu/ivpu_ipc.c
index 01ebf88fe6ef..0e096fd9b95d 100644
--- a/drivers/accel/ivpu/ivpu_ipc.c
+++ b/drivers/accel/ivpu/ivpu_ipc.c
@@ -459,13 +459,12 @@ void ivpu_ipc_irq_handler(struct ivpu_device *vdev)
}
}
- if (!list_empty(&ipc->cb_msg_list))
- if (!kfifo_put(&vdev->hw->irq.fifo, IVPU_HW_IRQ_SRC_IPC))
- ivpu_err_ratelimited(vdev, "IRQ FIFO full\n");
+ queue_work(system_wq, &vdev->irq_ipc_work);
}
-void ivpu_ipc_irq_thread_handler(struct ivpu_device *vdev)
+void ivpu_ipc_irq_work_fn(struct work_struct *work)
{
+ struct ivpu_device *vdev = container_of(work, struct ivpu_device, irq_ipc_work);
struct ivpu_ipc_info *ipc = vdev->ipc;
struct ivpu_ipc_rx_msg *rx_msg, *r;
struct list_head cb_msg_list;
diff --git a/drivers/accel/ivpu/ivpu_ipc.h b/drivers/accel/ivpu/ivpu_ipc.h
index b4dfb504679b..b524a1985b9d 100644
--- a/drivers/accel/ivpu/ivpu_ipc.h
+++ b/drivers/accel/ivpu/ivpu_ipc.h
@@ -90,7 +90,7 @@ void ivpu_ipc_disable(struct ivpu_device *vdev);
void ivpu_ipc_reset(struct ivpu_device *vdev);
void ivpu_ipc_irq_handler(struct ivpu_device *vdev);
-void ivpu_ipc_irq_thread_handler(struct ivpu_device *vdev);
+void ivpu_ipc_irq_work_fn(struct work_struct *work);
void ivpu_ipc_consumer_add(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons,
u32 channel, ivpu_ipc_rx_callback_t callback);
diff --git a/drivers/accel/ivpu/ivpu_job.c b/drivers/accel/ivpu/ivpu_job.c
index 7fed3c8406ee..c678dcddb8d8 100644
--- a/drivers/accel/ivpu/ivpu_job.c
+++ b/drivers/accel/ivpu/ivpu_job.c
@@ -935,7 +935,7 @@ void ivpu_job_done_consumer_fini(struct ivpu_device *vdev)
ivpu_ipc_consumer_del(vdev, &vdev->job_done_consumer);
}
-void ivpu_context_abort_thread_handler(struct work_struct *work)
+void ivpu_context_abort_work_fn(struct work_struct *work)
{
struct ivpu_device *vdev = container_of(work, struct ivpu_device, context_abort_work);
struct ivpu_file_priv *file_priv;
diff --git a/drivers/accel/ivpu/ivpu_job.h b/drivers/accel/ivpu/ivpu_job.h
index fef8aed1fc88..ff77ee1fcee2 100644
--- a/drivers/accel/ivpu/ivpu_job.h
+++ b/drivers/accel/ivpu/ivpu_job.h
@@ -72,7 +72,7 @@ void ivpu_cmdq_abort_all_jobs(struct ivpu_device *vdev, u32 ctx_id, u32 cmdq_id)
void ivpu_job_done_consumer_init(struct ivpu_device *vdev);
void ivpu_job_done_consumer_fini(struct ivpu_device *vdev);
-void ivpu_context_abort_thread_handler(struct work_struct *work);
+void ivpu_context_abort_work_fn(struct work_struct *work);
void ivpu_jobs_abort_all(struct ivpu_device *vdev);
diff --git a/drivers/accel/ivpu/ivpu_pm.c b/drivers/accel/ivpu/ivpu_pm.c
index 6821051dfa3a..f41b3bfe40af 100644
--- a/drivers/accel/ivpu/ivpu_pm.c
+++ b/drivers/accel/ivpu/ivpu_pm.c
@@ -452,8 +452,9 @@ int ivpu_pm_dct_disable(struct ivpu_device *vdev)
return 0;
}
-void ivpu_pm_dct_irq_thread_handler(struct ivpu_device *vdev)
+void ivpu_pm_irq_dct_work_fn(struct work_struct *work)
{
+ struct ivpu_device *vdev = container_of(work, struct ivpu_device, irq_dct_work);
bool enable;
int ret;
diff --git a/drivers/accel/ivpu/ivpu_pm.h b/drivers/accel/ivpu/ivpu_pm.h
index b70efe6c36e4..89b264cc0e3e 100644
--- a/drivers/accel/ivpu/ivpu_pm.h
+++ b/drivers/accel/ivpu/ivpu_pm.h
@@ -45,6 +45,6 @@ void ivpu_stop_job_timeout_detection(struct ivpu_device *vdev);
int ivpu_pm_dct_init(struct ivpu_device *vdev);
int ivpu_pm_dct_enable(struct ivpu_device *vdev, u8 active_percent);
int ivpu_pm_dct_disable(struct ivpu_device *vdev);
-void ivpu_pm_dct_irq_thread_handler(struct ivpu_device *vdev);
+void ivpu_pm_irq_dct_work_fn(struct work_struct *work);
#endif /* __IVPU_PM_H__ */
--
2.43.0
