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accel/habanalabs: capture interrupt timestamp in handler

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In order for interrupt timestamp to be more accurate we should
capture it during the interrupt handling rather than in threaded
irq context.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
This commit is contained in:
Ofir Bitton
2023-02-01 19:35:54 +02:00
committed by Oded Gabbay
parent 6012235899
commit bcfcd084aa
2 changed files with 8 additions and 3 deletions
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2
drivers/accel/habanalabs/common/habanalabs.h
View File

@@ -1107,6 +1107,7 @@ enum hl_user_interrupt_type {
* @type: user interrupt type
* @wait_list_head: head to the list of user threads pending on this interrupt
* @wait_list_lock: protects wait_list_head
* @timestamp: last timestamp taken upon interrupt
* @interrupt_id: msix interrupt id
*/
struct hl_user_interrupt {
@@ -1114,6 +1115,7 @@ struct hl_user_interrupt {
enum hl_user_interrupt_type type;
struct list_head wait_list_head;
spinlock_t wait_list_lock;
ktime_t timestamp;
u32 interrupt_id;
};

9
drivers/accel/habanalabs/common/irq.c
View File

@@ -280,7 +280,6 @@ static void handle_user_interrupt(struct hl_device *hdev, struct hl_user_interru
struct list_head *ts_reg_free_list_head = NULL;
struct timestamp_reg_work_obj *job;
bool reg_node_handle_fail = false;
ktime_t now = ktime_get();
int rc;
/* For registration nodes:
@@ -303,13 +302,13 @@ static void handle_user_interrupt(struct hl_device *hdev, struct hl_user_interru
if (pend->ts_reg_info.buf) {
if (!reg_node_handle_fail) {
rc = handle_registration_node(hdev, pend,
&ts_reg_free_list_head, now);
&ts_reg_free_list_head, intr->timestamp);
if (rc)
reg_node_handle_fail = true;
}
} else {
/* Handle wait target value node */
pend->fence.timestamp = now;
pend->fence.timestamp = intr->timestamp;
complete_all(&pend->fence.completion);
}
}
@@ -335,6 +334,10 @@ static void handle_user_interrupt(struct hl_device *hdev, struct hl_user_interru
*/
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;
}