[PATCH v3 3/5] drm/amdgpu: set GPU workload via ctx IOCTL

[Shashank Sharma <shashank.sharma@amd.com>]

This patch adds new IOCTL flags in amdgpu_context_IOCTL to set
GPU workload profile. These calls will allow a user to switch
to a GPU power profile which might be better suitable to its
workload type. The currently supported workload types are:
    "None": Default workload profile
    "3D": Workload profile for 3D rendering work
    "Video": Workload profile for Media/Encode/Decode work
    "VR": Workload profile for VR rendering work
    "Compute": Workload profile for Compute work

The workload hint flag is saved in GPU context, and then its
applied when we actually run the job.

V3: Create only set_workload interface, there is no need for
    get_workload (Christian)

Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 42 +++++++++++++++++++++++--
 drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.h |  1 +
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
index 8ee4e8491f39..937c294f8d84 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -27,6 +27,7 @@
 #include "amdgpu.h"
 #include "amdgpu_sched.h"
 #include "amdgpu_ras.h"
+#include "amdgpu_ctx_workload.h"
 #include <linux/nospec.h>
 
 #define to_amdgpu_ctx_entity(e)	\
@@ -328,7 +329,7 @@ static int amdgpu_ctx_init(struct amdgpu_ctx_mgr *mgr, int32_t priority,
 		return r;
 
 	ctx->stable_pstate = current_stable_pstate;
-
+	ctx->workload_mode = AMDGPU_CTX_WORKLOAD_HINT_NONE;
 	return 0;
 }
 
@@ -633,11 +634,34 @@ static int amdgpu_ctx_stable_pstate(struct amdgpu_device *adev,
 	return r;
 }
 
+static int amdgpu_ctx_set_workload_profile(struct amdgpu_device *adev,
+				       struct amdgpu_fpriv *fpriv, uint32_t id,
+				       u32 workload_hint)
+{
+	struct amdgpu_ctx *ctx;
+	struct amdgpu_ctx_mgr *mgr;
+
+	if (!fpriv)
+		return -EINVAL;
+
+	mgr = &fpriv->ctx_mgr;
+	mutex_lock(&mgr->lock);
+	ctx = idr_find(&mgr->ctx_handles, id);
+	if (!ctx) {
+		mutex_unlock(&mgr->lock);
+		return -EINVAL;
+	}
+
+	ctx->workload_mode = workload_hint;
+	mutex_unlock(&mgr->lock);
+	return 0;
+}
+
 int amdgpu_ctx_ioctl(struct drm_device *dev, void *data,
 		     struct drm_file *filp)
 {
 	int r;
-	uint32_t id, stable_pstate;
+	uint32_t id, stable_pstate, wl_hint;
 	int32_t priority;
 
 	union drm_amdgpu_ctx *args = data;
@@ -681,6 +705,20 @@ int amdgpu_ctx_ioctl(struct drm_device *dev, void *data,
 			return -EINVAL;
 		r = amdgpu_ctx_stable_pstate(adev, fpriv, id, true, &stable_pstate);
 		break;
+	case AMDGPU_CTX_OP_SET_WORKLOAD_PROFILE:
+		if (args->in.flags & ~AMDGPU_CTX_WORKLOAD_HINT_MASK)
+			return -EINVAL;
+		wl_hint = args->in.flags & AMDGPU_CTX_WORKLOAD_HINT_MASK;
+		if (wl_hint > AMDGPU_CTX_WORKLOAD_HINT_MAX)
+			return -EINVAL;
+		r = amdgpu_ctx_set_workload_profile(adev, fpriv, id, wl_hint);
+		if (r)
+			DRM_ERROR("Failed to set workload profile to %s\n",
+				amdgpu_workload_profile_name(wl_hint));
+		else
+			DRM_DEBUG_DRIVER("Workload profile set to %s\n",
+				amdgpu_workload_profile_name(wl_hint));
+		break;
 	default:
 		return -EINVAL;
 	}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.h
index cc7c8afff414..6c8032c3291a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.h
@@ -58,6 +58,7 @@ struct amdgpu_ctx {
 	unsigned long			ras_counter_ce;
 	unsigned long			ras_counter_ue;
 	uint32_t			stable_pstate;
+	uint32_t			workload_mode;
 };
 
 struct amdgpu_ctx_mgr {
-- 
2.34.1