[PATCH v3 3/9] drm/amdgpu: add new IOCTL for usermode queue

[Shashank Sharma]

From: Shashank Sharma <contactshashanksharma at gmail.com>

This patch adds:
- A new IOCTL function to create and destroy
- A new structure to keep all the user queue data in one place.
- A function to generate unique index for the queue.

V1: Worked on review comments from RFC patch series:
  - Alex: Keep a list of queues, instead of single queue per process.
  - Christian: Use the queue manager instead of global ptrs,
           Don't keep the queue structure in amdgpu_ctx

V2: Worked on review comments:
 - Christian:
   - Formatting of text
   - There is no need for queuing of userqueues, with idr in place
 - Alex:
   - Remove use_doorbell, its unnecessary
   - Reuse amdgpu_mqd_props for saving mqd fields

 - Code formatting and re-arrangement

V3:
 - Integration with doorbell manager

Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: Christian Koenig <christian.koenig at amd.com>
Signed-off-by: Shashank Sharma <contactshashanksharma at gmail.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       |   1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c | 113 ++++++++++++++++++
 .../gpu/drm/amd/include/amdgpu_userqueue.h    |   2 +
 3 files changed, 116 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 2d6bcfd727c8..229976a2d0e7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -2749,6 +2749,7 @@ const struct drm_ioctl_desc amdgpu_ioctls_kms[] = {
 	DRM_IOCTL_DEF_DRV(AMDGPU_GEM_VA, amdgpu_gem_va_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(AMDGPU_GEM_OP, amdgpu_gem_op_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(AMDGPU_GEM_USERPTR, amdgpu_gem_userptr_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
+	DRM_IOCTL_DEF_DRV(AMDGPU_USERQ, amdgpu_userq_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
 };
 
 static const struct drm_driver amdgpu_kms_driver = {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
index 13e1eebc1cb6..353f57c5a772 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
@@ -22,6 +22,119 @@
  */
 
 #include "amdgpu.h"
+#include "amdgpu_vm.h"
+#include "amdgpu_userqueue.h"
+
+static inline int
+amdgpu_userqueue_index(struct amdgpu_userq_mgr *uq_mgr, struct amdgpu_usermode_queue *queue)
+{
+    return idr_alloc(&uq_mgr->userq_idr, queue, 1, AMDGPU_MAX_USERQ, GFP_KERNEL);
+}
+
+static inline void
+amdgpu_userqueue_free_index(struct amdgpu_userq_mgr *uq_mgr, int queue_id)
+{
+    idr_remove(&uq_mgr->userq_idr, queue_id);
+}
+
+static struct amdgpu_usermode_queue *
+amdgpu_userqueue_find(struct amdgpu_userq_mgr *uq_mgr, int qid)
+{
+    return idr_find(&uq_mgr->userq_idr, qid);
+}
+
+static int amdgpu_userqueue_create(struct drm_file *filp, union drm_amdgpu_userq *args)
+{
+    struct amdgpu_usermode_queue *queue;
+    struct amdgpu_fpriv *fpriv = filp->driver_priv;
+    struct amdgpu_userq_mgr *uq_mgr = &fpriv->userq_mgr;
+    struct drm_amdgpu_userq_mqd *mqd_in = &args->in.mqd;
+    int r;
+
+    /* Do we have support userqueues for this IP ? */
+    if (!uq_mgr->userq_funcs[mqd_in->ip_type]) {
+        DRM_ERROR("GFX User queues not supported for this IP: %d\n", mqd_in->ip_type);
+        return -EINVAL;
+    }
+
+    queue = kzalloc(sizeof(struct amdgpu_usermode_queue), GFP_KERNEL);
+    if (!queue) {
+        DRM_ERROR("Failed to allocate memory for queue\n");
+        return -ENOMEM;
+    }
+
+    mutex_lock(&uq_mgr->userq_mutex);
+    queue->userq_prop.wptr_gpu_addr = mqd_in->wptr_va;
+    queue->userq_prop.rptr_gpu_addr = mqd_in->rptr_va;
+    queue->userq_prop.queue_size = mqd_in->queue_size;
+    queue->userq_prop.hqd_base_gpu_addr = mqd_in->queue_va;
+    queue->userq_prop.queue_size = mqd_in->queue_size;
+
+    queue->doorbell_handle = mqd_in->doorbell_handle;
+    queue->queue_type = mqd_in->ip_type;
+    queue->flags = mqd_in->flags;
+    queue->vm = &fpriv->vm;
+    queue->queue_id = amdgpu_userqueue_index(uq_mgr, queue);
+    if (queue->queue_id < 0) {
+        DRM_ERROR("Failed to allocate a queue id\n");
+        r = queue->queue_id;
+        goto free_queue;
+    }
+
+    args->out.queue_id = queue->queue_id;
+    args->out.flags = 0;
+    mutex_unlock(&uq_mgr->userq_mutex);
+    return 0;
+
+free_queue:
+    mutex_unlock(&uq_mgr->userq_mutex);
+    kfree(queue);
+    return r;
+}
+
+static void amdgpu_userqueue_destroy(struct drm_file *filp, int queue_id)
+{
+    struct amdgpu_fpriv *fpriv = filp->driver_priv;
+    struct amdgpu_userq_mgr *uq_mgr = &fpriv->userq_mgr;
+    struct amdgpu_usermode_queue *queue;
+
+    queue = amdgpu_userqueue_find(uq_mgr, queue_id);
+    if (!queue) {
+        DRM_DEBUG_DRIVER("Invalid queue id to destroy\n");
+        return;
+    }
+
+    mutex_lock(&uq_mgr->userq_mutex);
+    amdgpu_userqueue_free_index(uq_mgr, queue->queue_id);
+    mutex_unlock(&uq_mgr->userq_mutex);
+    kfree(queue);
+}
+
+int amdgpu_userq_ioctl(struct drm_device *dev, void *data,
+		       struct drm_file *filp)
+{
+    union drm_amdgpu_userq *args = data;
+    int r = 0;
+
+    switch (args->in.op) {
+    case AMDGPU_USERQ_OP_CREATE:
+        r = amdgpu_userqueue_create(filp, args);
+        if (r)
+            DRM_ERROR("Failed to create usermode queue\n");
+        break;
+
+    case AMDGPU_USERQ_OP_FREE:
+        amdgpu_userqueue_destroy(filp, args->in.queue_id);
+        break;
+
+    default:
+        DRM_ERROR("Invalid user queue op specified: %d\n", args->in.op);
+        return -EINVAL;
+    }
+
+    return r;
+}
+
 
 int amdgpu_userq_mgr_init(struct amdgpu_userq_mgr *userq_mgr, struct amdgpu_device *adev)
 {
diff --git a/drivers/gpu/drm/amd/include/amdgpu_userqueue.h b/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
index 7eeb8c9e6575..7625a862b1fc 100644
--- a/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
+++ b/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
@@ -42,6 +42,8 @@ struct amdgpu_userq_funcs {
 	void (*mqd_destroy)(struct amdgpu_userq_mgr *, struct amdgpu_usermode_queue *);
 };
 
+int amdgpu_userq_ioctl(struct drm_device *dev, void *data, struct drm_file *filp);
+
 int amdgpu_userq_mgr_init(struct amdgpu_userq_mgr *userq_mgr, struct amdgpu_device *adev);
 
 void amdgpu_userq_mgr_fini(struct amdgpu_userq_mgr *userq_mgr);
-- 
2.40.0