[PATCH 2/3] drm/v3d: add generic ioctl extension
Iago Toral
itoral at igalia.com
Wed Sep 15 13:24:42 UTC 2021
On Wed, 2021-08-18 at 18:56 +0100, Melissa Wen wrote:
> Add support to attach generic extensions on job submission.
> This patch is a second prep work to enable multiple syncobjs on job
> submission. With this work, when the job submission interface needs
> to be extended to accomodate a new feature, we will use a generic
> extension struct where an id determines the data type to be pointed.
> The first application is to enable multiples in/out syncobj (next
> patch), but the base is already done for future features.
>
> Signed-off-by: Melissa Wen <mwen at igalia.com>
> ---
> drivers/gpu/drm/v3d/v3d_drv.c | 4 +-
> drivers/gpu/drm/v3d/v3d_gem.c | 80 ++++++++++++++++++++++++++++++++-
> --
> include/uapi/drm/v3d_drm.h | 38 ++++++++++++++++-
> 3 files changed, 113 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/v3d/v3d_drv.c
> b/drivers/gpu/drm/v3d/v3d_drv.c
> index 9403c3b36aca..6a0516160bb2 100644
> --- a/drivers/gpu/drm/v3d/v3d_drv.c
> +++ b/drivers/gpu/drm/v3d/v3d_drv.c
> @@ -83,7 +83,6 @@ static int v3d_get_param_ioctl(struct drm_device
> *dev, void *data,
> return 0;
> }
>
> -
> switch (args->param) {
> case DRM_V3D_PARAM_SUPPORTS_TFU:
> args->value = 1;
> @@ -147,7 +146,7 @@ v3d_postclose(struct drm_device *dev, struct
> drm_file *file)
> DEFINE_DRM_GEM_FOPS(v3d_drm_fops);
>
> /* DRM_AUTH is required on SUBMIT_CL for now, while we don't have
> GMP
> - * protection between clients. Note that render nodes would be be
> + * protection between clients. Note that render nodes would be
> * able to submit CLs that could access BOs from clients
> authenticated
> * with the master node. The TFU doesn't use the GMP, so it would
> * need to stay DRM_AUTH until we do buffer size/offset validation.
> @@ -222,7 +221,6 @@ static int v3d_platform_drm_probe(struct
> platform_device *pdev)
> u32 mmu_debug;
> u32 ident1;
>
> -
> v3d = devm_drm_dev_alloc(dev, &v3d_drm_driver, struct v3d_dev,
> drm);
> if (IS_ERR(v3d))
> return PTR_ERR(v3d);
> diff --git a/drivers/gpu/drm/v3d/v3d_gem.c
> b/drivers/gpu/drm/v3d/v3d_gem.c
> index 593ed2206d74..e254919b6c5e 100644
> --- a/drivers/gpu/drm/v3d/v3d_gem.c
> +++ b/drivers/gpu/drm/v3d/v3d_gem.c
> @@ -521,6 +521,38 @@ v3d_attach_fences_and_unlock_reservation(struct
> drm_file *file_priv,
> }
> }
>
> +static int
> +v3d_get_extensions(struct drm_file *file_priv,
> + u32 ext_count, u64 ext_handles)
> +{
> + int i;
> + struct drm_v3d_extension __user *handles;
> +
> + if (!ext_count)
> + return 0;
> +
> + handles = u64_to_user_ptr(ext_handles);
> + for (i = 0; i < ext_count; i++) {
> + struct drm_v3d_extension ext;
> +
> + if (copy_from_user(&ext, handles, sizeof(ext))) {
> + DRM_DEBUG("Failed to copy submit extension\n");
> + return -EFAULT;
> + }
> +
> + switch (ext.id) {
> + case 0:
> + default:
> + DRM_DEBUG_DRIVER("Unknown extension id: %d\n",
> ext.id);
> + return -EINVAL;
> + }
> +
> + handles = u64_to_user_ptr(ext.next);
> + }
> +
> + return 0;
> +}
> +
> /**
> * v3d_submit_cl_ioctl() - Submits a job (frame) to the V3D.
> * @dev: DRM device
> @@ -549,15 +581,23 @@ v3d_submit_cl_ioctl(struct drm_device *dev,
> void *data,
>
> trace_v3d_submit_cl_ioctl(&v3d->drm, args->rcl_start, args-
> >rcl_end);
>
> - if (args->pad != 0)
> - return -EINVAL;
> -
> - if (args->flags != 0 &&
> - args->flags != DRM_V3D_SUBMIT_CL_FLUSH_CACHE) {
> + if (args->flags &&
> + args->flags & ~(DRM_V3D_SUBMIT_CL_FLUSH_CACHE |
> + DRM_V3D_SUBMIT_EXTENSION)) {
> DRM_INFO("invalid flags: %d\n", args->flags);
> return -EINVAL;
> }
>
> + if (args->flags & DRM_V3D_SUBMIT_EXTENSION) {
> + ret = v3d_get_extensions(file_priv,
> + args->extension_count,
> + args->extensions);
> + if (ret) {
> + DRM_DEBUG("Failed to get extensions.\n");
> + return ret;
> + }
> + }
> +
> render = kcalloc(1, sizeof(*render), GFP_KERNEL);
> if (!render)
> return -ENOMEM;
> @@ -711,6 +751,21 @@ v3d_submit_tfu_ioctl(struct drm_device *dev,
> void *data,
>
> trace_v3d_submit_tfu_ioctl(&v3d->drm, args->iia);
>
> + if (args->flags && !(args->flags & DRM_V3D_SUBMIT_EXTENSION)) {
> + DRM_DEBUG("invalid flags: %d\n", args->flags);
> + return -EINVAL;
> + }
> +
> + if (args->flags & DRM_V3D_SUBMIT_EXTENSION) {
> + ret = v3d_get_extensions(file_priv,
> + args->extension_count,
> + args->extensions);
> + if (ret) {
> + DRM_DEBUG("Failed to get extensions.\n");
> + return ret;
> + }
> + }
> +
> job = kcalloc(1, sizeof(*job), GFP_KERNEL);
> if (!job)
> return -ENOMEM;
> @@ -806,6 +861,21 @@ v3d_submit_csd_ioctl(struct drm_device *dev,
> void *data,
> return -EINVAL;
> }
>
> + if (args->flags && !(args->flags & DRM_V3D_SUBMIT_EXTENSION)) {
> + DRM_DEBUG("Invalid flags: %d\n", args->flags);
> + return -EINVAL;
> + }
> +
> + if (args->flags & DRM_V3D_SUBMIT_EXTENSION) {
> + ret = v3d_get_extensions(file_priv,
> + args->extension_count,
> + args->extensions);
> + if (ret) {
> + DRM_DEBUG("Failed to get extensions.\n");
> + return ret;
> + }
> + }
> +
> job = kcalloc(1, sizeof(*job), GFP_KERNEL);
> if (!job)
> return -ENOMEM;
> diff --git a/include/uapi/drm/v3d_drm.h b/include/uapi/drm/v3d_drm.h
> index 4104f22fb3d3..1f4706010eb5 100644
> --- a/include/uapi/drm/v3d_drm.h
> +++ b/include/uapi/drm/v3d_drm.h
> @@ -58,6 +58,19 @@ extern "C" {
> struct
> drm_v3d_perfmon_get_values)
>
> #define DRM_V3D_SUBMIT_CL_FLUSH_CACHE 0x01
> +#define DRM_V3D_SUBMIT_EXTENSION 0x02
> +
> +/* struct drm_v3d_extension - ioctl extensions
> + *
> + * Linked-list of generic extensions where the id identify which
> struct is
> + * pointed by ext_data. Therefore, DRM_V3D_EXT_ID_* is used on id to
> identify
> + * the extension type.
> + */
> +struct drm_v3d_extension {
> + __u64 next;
> + __u64 ext_data;
> + __u32 id;
> +};
>
> /**
> * struct drm_v3d_submit_cl - ioctl argument for submitting commands
> to the 3D
> @@ -135,12 +148,17 @@ struct drm_v3d_submit_cl {
> /* Number of BO handles passed in (size is that times 4). */
> __u32 bo_handle_count;
>
> + /* DRM_V3D_SUBMIT_* properties */
> __u32 flags;
>
> /* ID of the perfmon to attach to this job. 0 means no perfmon.
> */
> __u32 perfmon_id;
>
> - __u32 pad;
> + /* Number of extensions*/
> + __u32 extension_count;
> +
> + /* Pointer to a list of ioctl extensions*/
> + __u64 extensions;
> };
>
> /**
> @@ -248,6 +266,15 @@ struct drm_v3d_submit_tfu {
> __u32 in_sync;
> /* Sync object to signal when the TFU job is done. */
> __u32 out_sync;
> +
> + /* Number of extensions*/
> + __u32 extension_count;
> +
> + /* Pointer to an array of ioctl extensions*/
> + __u64 extensions;
> +
> + /* DRM_V3D_SUBMIT_* properties */
> + __u32 flags;
A silly nit: maybe put flags before the extension fields above for
consistency with the CSD and CL submission commands.
> };
>
> /* Submits a compute shader for dispatch. This job will block on
> any
> @@ -276,6 +303,15 @@ struct drm_v3d_submit_csd {
>
> /* ID of the perfmon to attach to this job. 0 means no perfmon.
> */
> __u32 perfmon_id;
> +
> + /* DRM_V3D_SUBMIT_* properties */
> + __u32 flags;
> +
> + /* Number of extensions*/
> + __u32 extension_count;
> +
> + /* Pointer to a list of ioctl extensions*/
> + __u64 extensions;
> };
>
> enum {
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