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habanalabs: support hard-reset scheduling during soft-reset 

As hard-reset can be requested during soft-reset, driver must allow
it or else critical events received during soft-reset will be
ignored.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
Ofir Bitton 2021-11-23 16:34:28 +02:00 committed by Oded Gabbay
parent 42eb2872e0
commit ce80098db2
2 changed files with 31 additions and 3 deletions
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31
drivers/misc/habanalabs/common/device.c
View File

@ -978,7 +978,7 @@ static void handle_reset_trigger(struct hl_device *hdev, u32 flags)
int hl_device_reset(struct hl_device *hdev, u32 flags)
{
bool hard_reset, from_hard_reset_thread, fw_reset, hard_instead_soft = false,
reset_upon_device_release = false;
reset_upon_device_release = false, schedule_hard_reset = false;
u64 idle_mask[HL_BUSY_ENGINES_MASK_EXT_SIZE] = {0};
struct hl_ctx *ctx;
int i, rc;
@ -1031,6 +1031,9 @@ do_reset:
/* Block future CS/VM/JOB completion operations */
spin_lock(&hdev->reset_info.lock);
if (hdev->reset_info.in_reset) {
/* We only allow scheduling of a hard reset during soft reset */
if (hard_reset && hdev->reset_info.is_in_soft_reset)
hdev->reset_info.hard_reset_schedule_flags = flags;
spin_unlock(&hdev->reset_info.lock);
return 0;
}
@ -1193,7 +1196,6 @@ kill_processes:
* is required for the initialization itself
*/
hdev->disabled = false;
hdev->reset_info.is_in_soft_reset = false;
rc = hdev->asic_funcs->hw_init(hdev);
if (rc) {
@ -1243,7 +1245,20 @@ kill_processes:
}
}
hdev->reset_info.in_reset = 0;
spin_lock(&hdev->reset_info.lock);
hdev->reset_info.is_in_soft_reset = false;
/* Schedule hard reset only if requested and if not already in hard reset.
* We keep 'in_reset' enabled, so no other reset can go in during the hard
* reset schedule
*/
if (!hard_reset && hdev->reset_info.hard_reset_schedule_flags)
schedule_hard_reset = true;
else
hdev->reset_info.in_reset = 0;
spin_unlock(&hdev->reset_info.lock);
hdev->reset_info.needs_reset = false;
dev_notice(hdev->dev, "Successfully finished resetting the device\n");
@ -1261,6 +1276,16 @@ kill_processes:
hdev->reset_info.soft_reset_cnt++;
}
if (schedule_hard_reset) {
dev_info(hdev->dev, "Performing hard reset scheduled during soft reset\n");
flags = hdev->reset_info.hard_reset_schedule_flags;
hdev->reset_info.hard_reset_schedule_flags = 0;
hdev->disabled = true;
hard_reset = true;
handle_reset_trigger(hdev, flags);
goto again;
}
return 0;
out_err:

3
drivers/misc/habanalabs/common/habanalabs.h
View File

@ -2460,6 +2460,8 @@ struct last_error_session_info {
* @lock: lock to protect critical reset flows.
* @soft_reset_cnt: number of soft reset since the driver was loaded.
* @hard_reset_cnt: number of hard reset since the driver was loaded.
* @hard_reset_schedule_flags: hard reset is scheduled to after current soft reset,
* here we hold the hard reset flags.
* @in_reset: is device in reset flow.
* @is_in_soft_reset: Device is currently in soft reset process.
* @needs_reset: true if reset_on_lockup is false and device should be reset
@ -2478,6 +2480,7 @@ struct hl_reset_info {
spinlock_t lock;
u32 soft_reset_cnt;
u32 hard_reset_cnt;
u32 hard_reset_schedule_flags;
u8 in_reset;
u8 is_in_soft_reset;
u8 needs_reset;