[PATCH 07/13] drm/amdgpu/userq: enable support for queue priorities

[Alex Deucher]

Enable users to create queues at different priority levels.
The highest level is restricted to drm master.

Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c | 26 ++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
index 57a4ef64e0b8b..b8b13b6ab4631 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
@@ -22,6 +22,7 @@
  *
  */
 
+#include <drm/drm_auth.h>
 #include <drm/drm_exec.h>
 #include "amdgpu.h"
 #include "amdgpu_vm.h"
@@ -260,6 +261,21 @@ amdgpu_userqueue_destroy(struct drm_file *filp, int 
queue_id)
        return r;
 }
 
+static int amdgpu_userq_priority_permit(struct drm_file *filp,
+                                       int priority)
+{
+       if (priority < AMDGPU_USERQ_CREATE_FLAGS_QUEUE_PRIORITY_HIGH)
+               return 0;
+
+       if (capable(CAP_SYS_NICE))
+               return 0;
+
+       if (drm_is_current_master(filp))
+               return 0;
+
+       return -EACCES;
+}
+
 static int
 amdgpu_userqueue_create(struct drm_file *filp, union drm_amdgpu_userq *args)
 {
@@ -271,6 +287,9 @@ amdgpu_userqueue_create(struct drm_file *filp, union 
drm_amdgpu_userq *args)
        struct amdgpu_db_info db_info;
        uint64_t index;
        int qid, r = 0;
+       int priority =
+               (args->in.flags & 
AMDGPU_USERQ_CREATE_FLAGS_QUEUE_PRIORITY_MASK) >>
+               AMDGPU_USERQ_CREATE_FLAGS_QUEUE_PRIORITY_SHIFT;
 
        /* Usermode queues are only supported for GFX IP as of now */
        if (args->in.ip_type != AMDGPU_HW_IP_GFX &&
@@ -280,6 +299,10 @@ amdgpu_userqueue_create(struct drm_file *filp, union 
drm_amdgpu_userq *args)
                return -EINVAL;
        }
 
+       r = amdgpu_userq_priority_permit(filp, priority);
+       if (r)
+               return r;
+
        /*
         * There could be a situation that we are creating a new queue while
         * the other queues under this UQ_mgr are suspended. So if there is any
@@ -305,6 +328,7 @@ amdgpu_userqueue_create(struct drm_file *filp, union 
drm_amdgpu_userq *args)
        queue->doorbell_handle = args->in.doorbell_handle;
        queue->queue_type = args->in.ip_type;
        queue->vm = &fpriv->vm;
+       queue->priority = priority;
 
        db_info.queue_type = queue->queue_type;
        db_info.doorbell_handle = queue->doorbell_handle;
@@ -377,7 +401,7 @@ int amdgpu_userq_ioctl(struct drm_device *dev, void *data,
 
        switch (args->in.op) {
        case AMDGPU_USERQ_OP_CREATE:
-               if (args->in.flags)
+               if (args->in.flags & 
~AMDGPU_USERQ_CREATE_FLAGS_QUEUE_PRIORITY_MASK)
                        return -EINVAL;
                r = amdgpu_userqueue_create(filp, args);
                if (r)
-- 
2.49.0