Re: [PATCH 13/33] drm/amdkfd: prepare map process for single process debug devices

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 

Am 2023-05-25 um 13:27 schrieb Jonathan Kim:

Older HW only supports debugging on a single process because the
SPI debug mode setting registers are device global.

The HWS has supplied a single pinned VMID (0xf) for MAP_PROCESS
for debug purposes. To pin the VMID, the KFD will remove the VMID from
the HWS dynamic VMID allocation via SET_RESOUCES so that a debugged
process will never migrate away from its pinned VMID.

The KFD is responsible for reserving and releasing this pinned VMID
accordingly whenever the debugger attaches and detaches respectively.

v2: spot fix ups using new kfd_node references

Signed-off-by: Jonathan Kim <jonathan.kim@xxxxxxx>


Reviewed-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>



---
  .../drm/amd/amdkfd/kfd_device_queue_manager.c | 93 +++++++++++++++++++
  .../drm/amd/amdkfd/kfd_device_queue_manager.h |  5 +
  .../drm/amd/amdkfd/kfd_packet_manager_v9.c    |  9 ++
  .../gpu/drm/amd/amdkfd/kfd_pm4_headers_ai.h   |  5 +-
  4 files changed, 111 insertions(+), 1 deletion(-)

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 d1f44feb7084..c8519adc89ac 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -1524,6 +1524,7 @@ static int initialize_cpsch(struct device_queue_manager *dqm)
  	dqm->gws_queue_count = 0;
  	dqm->active_runlist = false;
  	INIT_WORK(&dqm->hw_exception_work, kfd_process_hw_exception);
+	dqm->trap_debug_vmid = 0;
init_sdma_bitmaps(dqm); @@ -2500,6 +2501,98 @@ static void kfd_process_hw_exception(struct work_struct *work) 
  	amdgpu_amdkfd_gpu_reset(dqm->dev->adev);
  }
+int reserve_debug_trap_vmid(struct device_queue_manager *dqm, 
+				struct qcm_process_device *qpd)
+{
+	int r;
+	int updated_vmid_mask;
+
+	if (dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS) {
+		pr_err("Unsupported on sched_policy: %i\n", dqm->sched_policy);
+		return -EINVAL;
+	}
+
+	dqm_lock(dqm);
+
+	if (dqm->trap_debug_vmid != 0) {
+		pr_err("Trap debug id already reserved\n");
+		r = -EBUSY;
+		goto out_unlock;
+	}
+
+	r = unmap_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES, 0,
+			USE_DEFAULT_GRACE_PERIOD, false);
+	if (r)
+		goto out_unlock;
+
+	updated_vmid_mask = dqm->dev->kfd->shared_resources.compute_vmid_bitmap;
+	updated_vmid_mask &= ~(1 << dqm->dev->vm_info.last_vmid_kfd);
+
+	dqm->dev->kfd->shared_resources.compute_vmid_bitmap = updated_vmid_mask;
+	dqm->trap_debug_vmid = dqm->dev->vm_info.last_vmid_kfd;
+	r = set_sched_resources(dqm);
+	if (r)
+		goto out_unlock;
+
+	r = map_queues_cpsch(dqm);
+	if (r)
+		goto out_unlock;
+
+	pr_debug("Reserved VMID for trap debug: %i\n", dqm->trap_debug_vmid);
+
+out_unlock:
+	dqm_unlock(dqm);
+	return r;
+}
+
+/*
+ * Releases vmid for the trap debugger
+ */
+int release_debug_trap_vmid(struct device_queue_manager *dqm,
+			struct qcm_process_device *qpd)
+{
+	int r;
+	int updated_vmid_mask;
+	uint32_t trap_debug_vmid;
+
+	if (dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS) {
+		pr_err("Unsupported on sched_policy: %i\n", dqm->sched_policy);
+		return -EINVAL;
+	}
+
+	dqm_lock(dqm);
+	trap_debug_vmid = dqm->trap_debug_vmid;
+	if (dqm->trap_debug_vmid == 0) {
+		pr_err("Trap debug id is not reserved\n");
+		r = -EINVAL;
+		goto out_unlock;
+	}
+
+	r = unmap_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES, 0,
+			USE_DEFAULT_GRACE_PERIOD, false);
+	if (r)
+		goto out_unlock;
+
+	updated_vmid_mask = dqm->dev->kfd->shared_resources.compute_vmid_bitmap;
+	updated_vmid_mask |= (1 << dqm->dev->vm_info.last_vmid_kfd);
+
+	dqm->dev->kfd->shared_resources.compute_vmid_bitmap = updated_vmid_mask;
+	dqm->trap_debug_vmid = 0;
+	r = set_sched_resources(dqm);
+	if (r)
+		goto out_unlock;
+
+	r = map_queues_cpsch(dqm);
+	if (r)
+		goto out_unlock;
+
+	pr_debug("Released VMID for trap debug: %i\n", trap_debug_vmid);
+
+out_unlock:
+	dqm_unlock(dqm);
+	return r;
+}
+
  #if defined(CONFIG_DEBUG_FS)
static void seq_reg_dump(struct seq_file *m, 
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h
index d4dd3b4acbf0..bf7aa3f84182 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h
@@ -250,6 +250,7 @@ struct device_queue_manager {
  	struct kfd_mem_obj	*fence_mem;
  	bool			active_runlist;
  	int			sched_policy;
+	uint32_t		trap_debug_vmid;
/* hw exception */ 
  	bool			is_hws_hang;
@@ -285,6 +286,10 @@ unsigned int get_queues_per_pipe(struct device_queue_manager *dqm);
  unsigned int get_pipes_per_mec(struct device_queue_manager *dqm);
  unsigned int get_num_sdma_queues(struct device_queue_manager *dqm);
  unsigned int get_num_xgmi_sdma_queues(struct device_queue_manager *dqm);
+int reserve_debug_trap_vmid(struct device_queue_manager *dqm,
+			struct qcm_process_device *qpd);
+int release_debug_trap_vmid(struct device_queue_manager *dqm,
+			struct qcm_process_device *qpd);
static inline unsigned int get_sh_mem_bases_32(struct kfd_process_device *pdd) 
  {
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager_v9.c b/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager_v9.c
index 1fda6dcf84b1..0fe73dbd28af 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager_v9.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager_v9.c
@@ -34,6 +34,9 @@ static int pm_map_process_v9(struct packet_manager *pm,
  {
  	struct pm4_mes_map_process *packet;
  	uint64_t vm_page_table_base_addr = qpd->page_table_base;
+	struct kfd_node *kfd = pm->dqm->dev;
+	struct kfd_process_device *pdd =
+			container_of(qpd, struct kfd_process_device, qpd);
packet = (struct pm4_mes_map_process *)buffer; 
  	memset(buffer, 0, sizeof(struct pm4_mes_map_process));
@@ -49,6 +52,12 @@ static int pm_map_process_v9(struct packet_manager *pm,
  	packet->bitfields14.sdma_enable = 1;
  	packet->bitfields14.num_queues = (qpd->is_debug) ? 0 : qpd->queue_count;
+ if (kfd->dqm->trap_debug_vmid && pdd->process->debug_trap_enabled && 
+			pdd->process->runtime_info.runtime_state == DEBUG_RUNTIME_STATE_ENABLED) {
+		packet->bitfields2.debug_vmid = kfd->dqm->trap_debug_vmid;
+		packet->bitfields2.new_debug = 1;
+	}
+
  	packet->sh_mem_config = qpd->sh_mem_config;
  	packet->sh_mem_bases = qpd->sh_mem_bases;
  	if (qpd->tba_addr) {
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_pm4_headers_ai.h b/drivers/gpu/drm/amd/amdkfd/kfd_pm4_headers_ai.h
index 206f1960857f..8b6b2bd5c148 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_pm4_headers_ai.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_pm4_headers_ai.h
@@ -146,7 +146,10 @@ struct pm4_mes_map_process {
  	union {
  		struct {
  			uint32_t pasid:16;
-			uint32_t reserved1:8;
+			uint32_t reserved1:2;
+			uint32_t debug_vmid:4;
+			uint32_t new_debug:1;
+			uint32_t reserved2:1;
  			uint32_t diq_enable:1;
  			uint32_t process_quantum:7;
  		} bitfields2;
[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux