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gpu: nvgpu: implement GET_BUFFER_INFO ioctl

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Userspace applications will need to query buffer information such as
size, comptags allocation status, user associated metadata etc. for
enabling newer IPC mechanisms. Add support for this new ioctl.

Bug 200586313

Change-Id: I87607eb306afa0cce1bec7a1fb2925ec3bc33e50
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2480763
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Sagar Kamble
2021-02-02 19:40:53 +05:30
committed by mobile promotions
parent ed16377983
commit 79fb97100d
2 changed files with 124 additions and 2 deletions
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88
drivers/gpu/nvgpu/os/linux/ioctl_ctrl.c
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@@ -1917,6 +1917,89 @@ out:
#endif
#ifdef CONFIG_NVGPU_COMPRESSION
static int nvgpu_gpu_ioctl_get_buffer_info(struct gk20a *g,
struct nvgpu_gpu_get_buffer_info_args *args)
{
u64 user_metadata_addr = args->in.metadata_addr;
u32 in_metadata_size = args->in.metadata_size;
struct gk20a_dmabuf_priv *priv = NULL;
s32 dmabuf_fd = args->in.dmabuf_fd;
struct dma_buf *dmabuf;
int err = 0;
nvgpu_log_fn(g, " ");
if (!nvgpu_is_enabled(g, NVGPU_SUPPORT_BUFFER_METADATA)) {
nvgpu_err(g, "Buffer metadata not supported");
return -EINVAL;
}
args->out.metadata_size = 0;
args->out.flags = 0;
args->out.size = 0;
dmabuf = dma_buf_get(dmabuf_fd);
if (IS_ERR(dmabuf)) {
nvgpu_warn(g, "%s: fd %d is not a dmabuf",
__func__, dmabuf_fd);
return PTR_ERR(dmabuf);
}
args->out.size = dmabuf->size;
priv = gk20a_dma_buf_get_drvdata(dmabuf, dev_from_gk20a(g));
if (!priv) {
nvgpu_log_info(g, "Buffer metadata not allocated");
goto out;
}
nvgpu_mutex_acquire(&priv->lock);
if (in_metadata_size > 0) {
size_t write_size = priv->metadata_blob_size;
nvgpu_speculation_barrier();
if (write_size > in_metadata_size) {
write_size = in_metadata_size;
}
if (copy_to_user((void __user *)(uintptr_t)
user_metadata_addr,
priv->metadata_blob, write_size)) {
nvgpu_err(g, "metadata blob copy failed");
err = -EFAULT;
goto out_priv_unlock;
}
}
args->out.metadata_size = priv->metadata_blob_size;
if (priv->registered) {
args->out.flags |=
NVGPU_GPU_BUFFER_INFO_FLAGS_METADATA_REGISTERED;
}
if (priv->comptags.enabled) {
args->out.flags |=
NVGPU_GPU_BUFFER_INFO_FLAGS_COMPTAGS_ALLOCATED;
}
if (priv->mutable_metadata) {
args->out.flags |=
NVGPU_GPU_BUFFER_INFO_FLAGS_MUTABLE_METADATA;
}
nvgpu_log_info(g, "buffer info: fd: %d, flags %llx, size %llu",
dmabuf_fd, args->out.flags, args->out.size);
out_priv_unlock:
nvgpu_mutex_release(&priv->lock);
out:
dma_buf_put(dmabuf);
return err;
}
static int nvgpu_handle_comptags_control(struct gk20a *g,
struct dma_buf *dmabuf,
struct gk20a_dmabuf_priv *priv,
@@ -2462,6 +2545,11 @@ long gk20a_ctrl_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg
err = nvgpu_gpu_ioctl_register_buffer(g,
(struct nvgpu_gpu_register_buffer_args *)buf);
break;
case NVGPU_GPU_IOCTL_GET_BUFFER_INFO:
err = nvgpu_gpu_ioctl_get_buffer_info(g,
(struct nvgpu_gpu_get_buffer_info_args *)buf);
break;
#endif
default: