Am 2021-07-15 um 9:34 p.m. schrieb Oak Zeng:
> start_cpsch and stop_cpsch can be called during kfd device
> initialization or during gpu reset/recovery. So they can
> run concurrently. Currently in start_cpsch and stop_cpsch,
> pm_init and pm_uninit is not protected by the dpm lock.
> Imagine such a case that user use packet manager's function
> to submit a pm4 packet to hang hws (ie through command
> cat /sys/class/kfd/kfd/topology/nodes/1/gpu_id | sudo tee
> /sys/kernel/debug/kfd/hang_hws), while kfd device is under
> device reset/recovery so packet manager can be not initialized.
> There will be unpredictable protection fault in such case.
>
> This patch moves pm_init/uninit inside the dpm lock and check
> packet manager is initialized before using packet manager
> function.
>
> Signed-off-by: Oak Zeng <Oak.Zeng@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdkfd/kfd_device.c | 8 +-------
> drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 10 ++++++++--
> drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c | 3 +++
> 3 files changed, 12 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
> index c51402b..adc2342 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
> @@ -1383,18 +1383,12 @@ void kgd2kfd_smi_event_throttle(struct kfd_dev *kfd, uint32_t throttle_bitmask)
> */
> int kfd_debugfs_hang_hws(struct kfd_dev *dev)
> {
> - int r = 0;
> -
> if (dev->dqm->sched_policy != KFD_SCHED_POLICY_HWS) {
> pr_err("HWS is not enabled");
> return -EINVAL;
> }
>
> - r = pm_debugfs_hang_hws(&dev->dqm->dpm);
> - if (!r)
> - r = dqm_debugfs_execute_queues(dev->dqm);
> -
> - return r;
> + return dqm_debugfs_execute_queues(dev->dqm);
This function should now probably be renamed to something like
dqm_debugfs_hang_hws. Other than that, this patch looks good to me.
Regards,
Felix
> }
>
> #endif
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> index f2984d3..44136d2 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> @@ -1164,6 +1164,7 @@ static int start_cpsch(struct device_queue_manager *dqm)
>
> retval = 0;
>
> + dqm_lock(dqm);
> retval = pm_init(&dqm->dpm, dqm);
> if (retval)
> goto fail_packet_manager_init;
> @@ -1186,7 +1187,6 @@ static int start_cpsch(struct device_queue_manager *dqm)
>
> init_interrupts(dqm);
>
> - dqm_lock(dqm);
> /* clear hang status when driver try to start the hw scheduler */
> dqm->is_hws_hang = false;
> dqm->is_resetting = false;
> @@ -1199,6 +1199,7 @@ static int start_cpsch(struct device_queue_manager *dqm)
> fail_set_sched_resources:
> pm_uninit(&dqm->dpm, false);
> fail_packet_manager_init:
> + dqm_unlock(dqm);
> return retval;
> }
>
> @@ -1211,12 +1212,12 @@ static int stop_cpsch(struct device_queue_manager *dqm)
> unmap_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES, 0);
> hanging = dqm->is_hws_hang || dqm->is_resetting;
> dqm->sched_running = false;
> - dqm_unlock(dqm);
>
> pm_release_ib(&dqm->dpm);
>
> kfd_gtt_sa_free(dqm->dev, dqm->fence_mem);
> pm_uninit(&dqm->dpm, hanging);
> + dqm_unlock(dqm);
>
> return 0;
> }
> @@ -2104,6 +2105,11 @@ int dqm_debugfs_execute_queues(struct device_queue_manager *dqm)
> int r = 0;
>
> dqm_lock(dqm);
> + r = pm_debugfs_hang_hws(&dqm->dpm);
> + if (r) {
> + dqm_unlock(dqm);
> + return r;
> + }
> dqm->active_runlist = true;
> r = execute_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES, 0);
> dqm_unlock(dqm);
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c
> index b130cc0..0123e64 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c
> @@ -448,6 +448,9 @@ int pm_debugfs_hang_hws(struct packet_manager *pm)
> uint32_t *buffer, size;
> int r = 0;
>
> + if (!pm->priv_queue)
> + return -EBUSY;
> +
> size = pm->pmf->query_status_size;
> mutex_lock(&pm->lock);
> kq_acquire_packet_buffer(pm->priv_queue,
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