[PATCH 20/32] drm/amdkfd: add debug trap enabled flag to tma

[Jonathan Kim <jonathan.kim@amd.com>]

From: Jay Cornwall <jay.cornwall@amd.com>

Trap handler behavior will differ when a debugger is attached.

Make the debug trap flag available in the trap handler TMA.
Update it when the debug trap ioctl is invoked.

v4: fix up comments to clarify flagging implementation.

v3: Rebase for upstream

v2:
Add missing debug flag setup on APUs

Signed-off-by: Jay Cornwall <jay.cornwall@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Jonathan Kim <jonathan.kim@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_debug.c   | 11 +++++++++++
 drivers/gpu/drm/amd/amdkfd/kfd_priv.h    |  2 ++
 drivers/gpu/drm/amd/amdkfd/kfd_process.c | 15 +++++++++++++++
 3 files changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_debug.c b/drivers/gpu/drm/amd/amdkfd/kfd_debug.c
index 47f8425a0db3..16acf3d416eb 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_debug.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_debug.c
@@ -257,6 +257,8 @@ void kfd_dbg_trap_deactivate(struct kfd_process *target, bool unwind, int unwind
 		if (unwind && count == unwind_count)
 			break;
 
+		kfd_process_set_trap_debug_flag(&pdd->qpd, false);
+
 		/* GFX off is already disabled by debug activate if not RLC restore supported. */
 		if (kfd_dbg_is_rlc_restore_supported(pdd->dev))
 			amdgpu_gfx_off_ctrl(pdd->dev->adev, false);
@@ -355,6 +357,15 @@ int kfd_dbg_trap_activate(struct kfd_process *target)
 		if (kfd_dbg_is_rlc_restore_supported(pdd->dev))
 			amdgpu_gfx_off_ctrl(pdd->dev->adev, true);
 
+		/**
+		 * Setting the debug flag in the trap handler requires that the TMA has been
+		 * allocated, which occurs during CWSR initialization.
+		 * In the event that CWSR has not been initialized at this point, setting the
+		 * flag will be called again during CWSR initialization if the target process
+		 * is still debug enabled.
+		 */
+		kfd_process_set_trap_debug_flag(&pdd->qpd, true);
+
 		if (!pdd->dev->shared_resources.enable_mes)
 			r = debug_refresh_runlist(pdd->dev->dqm);
 		else
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index 63c59ad2a4ca..d7f00181ae6b 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -1104,6 +1104,8 @@ int kfd_init_apertures(struct kfd_process *process);
 void kfd_process_set_trap_handler(struct qcm_process_device *qpd,
 				  uint64_t tba_addr,
 				  uint64_t tma_addr);
+void kfd_process_set_trap_debug_flag(struct qcm_process_device *qpd,
+				     bool enabled);
 
 /* CWSR initialization */
 int kfd_process_init_cwsr_apu(struct kfd_process *process, struct file *filep);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index 8519604f7249..5da1edd36bd2 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -1250,6 +1250,8 @@ int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep)
 
 		memcpy(qpd->cwsr_kaddr, dev->cwsr_isa, dev->cwsr_isa_size);
 
+		kfd_process_set_trap_debug_flag(qpd, p->debug_trap_enabled);
+
 		qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET;
 		pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n",
 			qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr);
@@ -1286,6 +1288,9 @@ static int kfd_process_device_init_cwsr_dgpu(struct kfd_process_device *pdd)
 
 	memcpy(qpd->cwsr_kaddr, dev->cwsr_isa, dev->cwsr_isa_size);
 
+	kfd_process_set_trap_debug_flag(&pdd->qpd,
+					pdd->process->debug_trap_enabled);
+
 	qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET;
 	pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n",
 		 qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr);
@@ -1372,6 +1377,16 @@ bool kfd_process_xnack_mode(struct kfd_process *p, bool supported)
 	return true;
 }
 
+void kfd_process_set_trap_debug_flag(struct qcm_process_device *qpd,
+				     bool enabled)
+{
+	if (qpd->cwsr_kaddr) {
+		uint64_t *tma =
+			(uint64_t *)(qpd->cwsr_kaddr + KFD_CWSR_TMA_OFFSET);
+		tma[2] = enabled;
+	}
+}
+
 /*
  * On return the kfd_process is fully operational and will be freed when the
  * mm is released
-- 
2.25.1