gpu: nvgpu: Remove NVGPU_IOCTL_GET_BUFFER_INFO

The IOCTL was introduced for making efficient query of buffer
identity and size. It was never taken into use, and it adds a
dependency to Tegra specific dma_buf API, so remove it.

JIRA NVGPU-4

Change-Id: I194d7bb1f54997900a3be8d39c93331befa225c7
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1648001
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/common/linux/dmabuf.c

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+* Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -140,7 +140,6 @@ int gk20a_dmabuf_alloc_drvdata(struct dma_buf *dmabuf, struct device *dev)
 {
 	struct gk20a *g = gk20a_get_platform(dev)->g;
 	struct gk20a_dmabuf_priv *priv;
-	static u64 priv_count = 0;
 
 	priv = dma_buf_get_drvdata(dmabuf, dev);
 	if (likely(priv))
@@ -159,7 +158,6 @@ int gk20a_dmabuf_alloc_drvdata(struct dma_buf *dmabuf, struct device *dev)
 
 	nvgpu_mutex_init(&priv->lock);
 	nvgpu_init_list_node(&priv->states);
-	priv->buffer_id = ++priv_count;
 	priv->g = g;
 	dma_buf_set_drvdata(dmabuf, dev, priv, gk20a_mm_delete_priv);
 
@@ -214,34 +212,3 @@ out:
 		*state = s;
 	return err;
 }
-
-int gk20a_mm_get_buffer_info(struct device *dev, int dmabuf_fd,
-			     u64 *buffer_id, u64 *buffer_len)
-{
-	struct dma_buf *dmabuf;
-	struct gk20a_dmabuf_priv *priv;
-	int err = 0;
-
-	dmabuf = dma_buf_get(dmabuf_fd);
-	if (IS_ERR(dmabuf)) {
-		dev_warn(dev, "%s: fd %d is not a dmabuf", __func__, dmabuf_fd);
-		return PTR_ERR(dmabuf);
-	}
-
-	err = gk20a_dmabuf_alloc_drvdata(dmabuf, dev);
-	if (err) {
-		dev_warn(dev, "Failed to allocate dmabuf drvdata (err = %d)",
-			 err);
-		goto clean_up;
-	}
-
-	priv = dma_buf_get_drvdata(dmabuf, dev);
-	if (likely(priv)) {
-		*buffer_id = priv->buffer_id;
-		*buffer_len = dmabuf->size;
-	}
-
-clean_up:
-	dma_buf_put(dmabuf);
-	return err;
-}

drivers/gpu/nvgpu/common/linux/dmabuf.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+* Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -57,7 +57,4 @@ int gk20a_dmabuf_alloc_drvdata(struct dma_buf *dmabuf, struct device *dev);
 int gk20a_dmabuf_get_state(struct dma_buf *dmabuf, struct gk20a *g,
 			   u64 offset, struct gk20a_buffer_state **state);
 
-int gk20a_mm_get_buffer_info(struct device *dev, int dmabuf_fd,
-			     u64 *buffer_id, u64 *buffer_len);
-
 #endif

drivers/gpu/nvgpu/common/linux/ioctl_ctrl.c

@@ -753,13 +753,6 @@ static int gk20a_ctrl_vsm_mapping(struct gk20a *g,
 	return err;
 }
 
-static int gk20a_ctrl_get_buffer_info(
-	struct gk20a *g, struct nvgpu_gpu_get_buffer_info_args *args)
-{
-	return gk20a_mm_get_buffer_info(dev_from_gk20a(g), args->in.dmabuf_fd,
-					&args->out.id, &args->out.length);
-}
-
 static int nvgpu_gpu_get_cpu_time_correlation_info(
 	struct gk20a *g,
 	struct nvgpu_gpu_get_cpu_time_correlation_info_args *args)
@@ -1757,11 +1750,6 @@ long gk20a_ctrl_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg
 			(struct nvgpu_gpu_vsms_mapping *)buf);
 		break;
 
-	case NVGPU_GPU_IOCTL_GET_BUFFER_INFO:
-		err = gk20a_ctrl_get_buffer_info(g,
-			(struct nvgpu_gpu_get_buffer_info_args *)buf);
-		break;
-
 	case NVGPU_GPU_IOCTL_GET_CPU_TIME_CORRELATION_INFO:
 		err = nvgpu_gpu_get_cpu_time_correlation_info(g,
 			(struct nvgpu_gpu_get_cpu_time_correlation_info_args *)buf);

include/uapi/linux/nvgpu.h

@@ -1,7 +1,7 @@
 /*
  * NVGPU Public Interface Header
  *
- * Copyright (c) 2011-2017, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2011-2018, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -892,8 +892,6 @@ struct nvgpu_gpu_set_deterministic_opts_args {
 	_IOWR(NVGPU_GPU_IOCTL_MAGIC, 18, struct nvgpu_gpu_num_vsms)
 #define NVGPU_GPU_IOCTL_VSMS_MAPPING \
 	_IOWR(NVGPU_GPU_IOCTL_MAGIC, 19, struct nvgpu_gpu_vsms_mapping)
-#define NVGPU_GPU_IOCTL_GET_BUFFER_INFO \
-	_IOWR(NVGPU_GPU_IOCTL_MAGIC, 20, struct nvgpu_gpu_get_buffer_info_args)
 #define NVGPU_GPU_IOCTL_RESUME_FROM_PAUSE \
 	_IO(NVGPU_GPU_IOCTL_MAGIC, 21)
 #define NVGPU_GPU_IOCTL_TRIGGER_SUSPEND \