[PATCH 2/2] drm/amdkfd: support the debugger during per-queue reset
Alex Deucher
alexdeucher at gmail.com
Fri Jul 26 18:56:49 UTC 2024
On Fri, Jul 26, 2024 at 11:40 AM Jonathan Kim <Jonathan.Kim at amd.com> wrote:
>
> In order to allow ROCm GDB to handle reset queues, raise an
> EC_QUEUE_RESET exception so that the debugger can subscribe and
> query this exception.
>
> Reset queues should still be considered suspendable with a status
> flag of KFD_DBG_QUEUE_RESET_MASK.
> However they should not be resumable since user space will no longer
> be able to access reset queues.
Do you have a link to the proposed debugger code which uses this?
Alex
>
> v2: move per-queue reset flag to this patch
> rebase based on patch 1 changes
>
> Signed-off-by: Jonathan Kim <jonathan.kim at amd.com>
> ---
> .../drm/amd/amdkfd/kfd_device_queue_manager.c | 31 ++++++++++++++++---
> drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 1 +
> include/uapi/linux/kfd_ioctl.h | 4 +++
> 3 files changed, 31 insertions(+), 5 deletions(-)
>
> 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 e335703eff84..cb7b5bbf5c40 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> @@ -164,6 +164,10 @@ static void kfd_hws_hang(struct device_queue_manager *dqm)
> struct kfd_process_device *pdd = qpd_to_pdd(qpd);
>
> pdd->has_reset_queue = true;
> + q->properties.is_reset = true;
> + kfd_dbg_ev_raise(KFD_EC_MASK(EC_QUEUE_RESET),
> + q->process, q->device, q->doorbell_id,
> + false, NULL, 0);
> }
> }
>
> @@ -986,7 +990,7 @@ static int suspend_single_queue(struct device_queue_manager *dqm,
> {
> bool is_new;
>
> - if (q->properties.is_suspended)
> + if (q->properties.is_suspended || q->properties.is_reset)
> return 0;
>
> pr_debug("Suspending PASID %u queue [%i]\n",
> @@ -1007,6 +1011,9 @@ static int suspend_single_queue(struct device_queue_manager *dqm,
> if (dqm->dev->kfd->shared_resources.enable_mes) {
> int r = remove_queue_mes(dqm, q, &pdd->qpd);
>
> + if (q->properties.is_reset)
> + return 0;
> +
> if (r)
> return r;
> }
> @@ -1967,10 +1974,14 @@ static void set_queue_as_reset(struct device_queue_manager *dqm, struct queue *q
> q->properties.queue_id, q->process->pasid);
>
> pdd->has_reset_queue = true;
> + q->properties.is_reset = true;
> if (q->properties.is_active) {
> q->properties.is_active = false;
> decrement_queue_count(dqm, qpd, q);
> }
> +
> + kfd_dbg_ev_raise(KFD_EC_MASK(EC_QUEUE_RESET), q->process, q->device,
> + q->doorbell_id, false, NULL, 0);
> }
>
> static int detect_queue_hang(struct device_queue_manager *dqm)
> @@ -3037,7 +3048,8 @@ int resume_queues(struct kfd_process *p,
> queue_ids[q_idx] &=
> ~KFD_DBG_QUEUE_INVALID_MASK;
> } else {
> - queue_ids[q_idx] |=
> + queue_ids[q_idx] |= q->properties.is_reset ?
> + KFD_DBG_QUEUE_RESET_MASK :
> KFD_DBG_QUEUE_ERROR_MASK;
> break;
> }
> @@ -3072,7 +3084,7 @@ int resume_queues(struct kfd_process *p,
> queue_ids);
>
> /* mask queue as error on resume fail */
> - if (q_idx != QUEUE_NOT_FOUND)
> + if (q_idx != QUEUE_NOT_FOUND && !q->properties.is_reset)
> queue_ids[q_idx] |=
> KFD_DBG_QUEUE_ERROR_MASK;
> }
> @@ -3119,6 +3131,7 @@ int suspend_queues(struct kfd_process *p,
> struct qcm_process_device *qpd = &pdd->qpd;
> struct queue *q;
> int r, per_device_suspended = 0;
> + bool has_queue_reset_fail = false;
>
> mutex_lock(&p->event_mutex);
> dqm_lock(dqm);
> @@ -3135,6 +3148,9 @@ int suspend_queues(struct kfd_process *p,
>
> if (!err) {
> queue_ids[q_idx] &= ~KFD_DBG_QUEUE_INVALID_MASK;
> + if (q->properties.is_reset)
> + queue_ids[q_idx] |= KFD_DBG_QUEUE_RESET_MASK;
> +
> if (exception_clear_mask && is_mes)
> q->properties.exception_status &=
> ~exception_clear_mask;
> @@ -3176,13 +3192,18 @@ int suspend_queues(struct kfd_process *p,
> continue;
>
> /* mask queue as error on suspend fail */
> - if (r)
> + if (r && !q->properties.is_reset) {
> + has_queue_reset_fail = true;
> queue_ids[q_idx] |= KFD_DBG_QUEUE_ERROR_MASK;
> - else if (exception_clear_mask)
> + } else if (exception_clear_mask) {
> q->properties.exception_status &=
> ~exception_clear_mask;
> + }
> }
>
> + if (!has_queue_reset_fail)
> + total_suspended += per_device_suspended;
> +
> dqm_unlock(dqm);
> mutex_unlock(&p->event_mutex);
> amdgpu_device_flush_hdp(dqm->dev->adev, NULL);
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> index 892a85408c09..192e3102c152 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> @@ -504,6 +504,7 @@ struct queue_properties {
> bool is_being_destroyed;
> bool is_active;
> bool is_gws;
> + bool is_reset;
> uint32_t pm4_target_xcc;
> bool is_dbg_wa;
> bool is_user_cu_masked;
> diff --git a/include/uapi/linux/kfd_ioctl.h b/include/uapi/linux/kfd_ioctl.h
> index 285a36601dc9..4713f9a6796e 100644
> --- a/include/uapi/linux/kfd_ioctl.h
> +++ b/include/uapi/linux/kfd_ioctl.h
> @@ -875,6 +875,7 @@ enum kfd_dbg_trap_exception_code {
> EC_QUEUE_PACKET_DISPATCH_WORK_GROUP_SIZE_INVALID = 21,
> EC_QUEUE_PACKET_DISPATCH_REGISTER_INVALID = 22,
> EC_QUEUE_PACKET_VENDOR_UNSUPPORTED = 23,
> + EC_QUEUE_RESET = 29,
> EC_QUEUE_PREEMPTION_ERROR = 30,
> EC_QUEUE_NEW = 31,
> /* per device */
> @@ -907,6 +908,7 @@ enum kfd_dbg_trap_exception_code {
> KFD_EC_MASK(EC_QUEUE_PACKET_DISPATCH_WORK_GROUP_SIZE_INVALID) | \
> KFD_EC_MASK(EC_QUEUE_PACKET_DISPATCH_REGISTER_INVALID) | \
> KFD_EC_MASK(EC_QUEUE_PACKET_VENDOR_UNSUPPORTED) | \
> + KFD_EC_MASK(EC_QUEUE_RESET) | \
> KFD_EC_MASK(EC_QUEUE_PREEMPTION_ERROR) | \
> KFD_EC_MASK(EC_QUEUE_NEW))
> #define KFD_EC_MASK_DEVICE (KFD_EC_MASK(EC_DEVICE_QUEUE_DELETE) | \
> @@ -997,8 +999,10 @@ struct kfd_queue_snapshot_entry {
> };
>
> /* Queue status return for suspend/resume */
> +#define KFD_DBG_QUEUE_RESET_BIT 29
> #define KFD_DBG_QUEUE_ERROR_BIT 30
> #define KFD_DBG_QUEUE_INVALID_BIT 31
> +#define KFD_DBG_QUEUE_RESET_MASK (1 << KFD_DBG_QUEUE_RESET_BIT)
> #define KFD_DBG_QUEUE_ERROR_MASK (1 << KFD_DBG_QUEUE_ERROR_BIT)
> #define KFD_DBG_QUEUE_INVALID_MASK (1 << KFD_DBG_QUEUE_INVALID_BIT)
>
> --
> 2.34.1
>
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