[RFC 03/10] drm/amdgpu: introduce PMC ioctl handler

[Zhu Lingshan]

This commit introduces ioctl handler for PMC.

In this commit, the handler only performs
basic checkings, including permission and whether
user queues are enabled.

Signed-off-by: Zhu Lingshan <lingshan....@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.c | 28 +++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.c
index 04902696adab..feff37279575 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.c
@@ -23,9 +23,35 @@
  */
 
 #include <linux/errno.h>
+#include <linux/capability.h>
 #include <drm/amdgpu_drm.h>
+#include "amdgpu.h"
+#include "amdgpu_userq.h"
 #include "amdgpu_profiler.h"
 
+static int amdgpu_profiler_check_access(struct drm_device *dev)
+{
+       if (!perfmon_capable())
+               return -EPERM;
+
+       if (!amdgpu_userq_enabled(dev))
+               return -EOPNOTSUPP;
+
+       return 0;
+}
+
+static int amdgpu_profiler_pmc(struct drm_device *dev, struct drm_file *filp,
+                              bool enable)
+{
+       int ret;
+
+       ret = amdgpu_profiler_check_access(dev);
+       if (ret)
+               return ret;
+
+       return -EOPNOTSUPP;
+}
+
 int amdgpu_profiler_ioctl(struct drm_device *dev, void *data, struct drm_file 
*filp)
 {
        struct drm_amdgpu_profiler_args *args = data;
@@ -37,7 +63,7 @@ int amdgpu_profiler_ioctl(struct drm_device *dev, void *data, 
struct drm_file *f
        case AMDGPU_PROFILER_OP_RESERVE:
                return -EOPNOTSUPP;
        case AMDGPU_PROFILER_OP_PMC:
-               return -EOPNOTSUPP;
+               return amdgpu_profiler_pmc(dev, filp, args->perfcount_enable);
        default:
                return -EINVAL;
        }
-- 
2.55.0