On Thu, 2025-07-10 at 11:08 -0400, Rodrigo Vivi wrote:
> From: Badal Nilawar <badal.nila...@intel.com>
>
> Introduce a debug filesystem node to disable late binding fw reload
> during the system or runtime resume. This is intended for situations
> where the late binding fw needs to be loaded from user mode,
> perticularly for validation purpose.
> Note that xe kmd doesn't participate in late binding flow from user
> space. Binary loaded from the userspace will be lost upon entering to
> D3 cold hence user space app need to handle this situation.
>
> v2:
> - s/(uval == 1) ? true : false/!!uval/ (Daniele)
> v3:
> - Refine the commit message (Daniele)
>
> Acked-by: Rodrigo Vivi <rodrigo.v...@intel.com>
> Signed-off-by: Badal Nilawar <badal.nila...@intel.com>
> Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospu...@intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.v...@intel.com>
Bit of a flyby comment here, but would it be better if this was
configfs rather than debugfs in case we wanted to skip this on the
first probe?
Thanks,
Stuart
> ---
> drivers/gpu/drm/xe/xe_debugfs.c | 41
> ++++++++++++++++++++++
> drivers/gpu/drm/xe/xe_late_bind_fw.c | 3 ++
> drivers/gpu/drm/xe/xe_late_bind_fw_types.h | 2 ++
> 3 files changed, 46 insertions(+)
>
> diff --git a/drivers/gpu/drm/xe/xe_debugfs.c
> b/drivers/gpu/drm/xe/xe_debugfs.c
> index d83cd6ed3fa8..d1f6f556efa2 100644
> --- a/drivers/gpu/drm/xe/xe_debugfs.c
> +++ b/drivers/gpu/drm/xe/xe_debugfs.c
> @@ -226,6 +226,44 @@ static const struct file_operations
> atomic_svm_timeslice_ms_fops = {
> .write = atomic_svm_timeslice_ms_set,
> };
>
> +static ssize_t disable_late_binding_show(struct file *f, char __user
> *ubuf,
> + size_t size, loff_t *pos)
> +{
> + struct xe_device *xe = file_inode(f)->i_private;
> + struct xe_late_bind *late_bind = &xe->late_bind;
> + char buf[32];
> + int len;
> +
> + len = scnprintf(buf, sizeof(buf), "%d\n", late_bind-
> >disable);
> +
> + return simple_read_from_buffer(ubuf, size, pos, buf, len);
> +}
> +
> +static ssize_t disable_late_binding_set(struct file *f, const char
> __user *ubuf,
> + size_t size, loff_t *pos)
> +{
> + struct xe_device *xe = file_inode(f)->i_private;
> + struct xe_late_bind *late_bind = &xe->late_bind;
> + u32 uval;
> + ssize_t ret;
> +
> + ret = kstrtouint_from_user(ubuf, size, sizeof(uval), &uval);
> + if (ret)
> + return ret;
> +
> + if (uval > 1)
> + return -EINVAL;
> +
> + late_bind->disable = !!uval;
> + return size;
> +}
> +
> +static const struct file_operations disable_late_binding_fops = {
> + .owner = THIS_MODULE,
> + .read = disable_late_binding_show,
> + .write = disable_late_binding_set,
> +};
> +
> void xe_debugfs_register(struct xe_device *xe)
> {
> struct ttm_device *bdev = &xe->ttm;
> @@ -249,6 +287,9 @@ void xe_debugfs_register(struct xe_device *xe)
> debugfs_create_file("atomic_svm_timeslice_ms", 0600, root,
> xe,
> &atomic_svm_timeslice_ms_fops);
>
> + debugfs_create_file("disable_late_binding", 0600, root, xe,
> + &disable_late_binding_fops);
> +
> for (mem_type = XE_PL_VRAM0; mem_type <= XE_PL_VRAM1;
> ++mem_type) {
> man = ttm_manager_type(bdev, mem_type);
>
> diff --git a/drivers/gpu/drm/xe/xe_late_bind_fw.c
> b/drivers/gpu/drm/xe/xe_late_bind_fw.c
> index df43523e9043..88355adce1d0 100644
> --- a/drivers/gpu/drm/xe/xe_late_bind_fw.c
> +++ b/drivers/gpu/drm/xe/xe_late_bind_fw.c
> @@ -167,6 +167,9 @@ int xe_late_bind_fw_load(struct xe_late_bind
> *late_bind)
> if (!late_bind->component_added)
> return -ENODEV;
>
> + if (late_bind->disable)
> + return 0;
> +
> for (fw_id = 0; fw_id < XE_LB_FW_MAX_ID; fw_id++) {
> lbfw = &late_bind->late_bind_fw[fw_id];
> if (lbfw->payload) {
> diff --git a/drivers/gpu/drm/xe/xe_late_bind_fw_types.h
> b/drivers/gpu/drm/xe/xe_late_bind_fw_types.h
> index 5c0574aff7b9..158dc1abe072 100644
> --- a/drivers/gpu/drm/xe/xe_late_bind_fw_types.h
> +++ b/drivers/gpu/drm/xe/xe_late_bind_fw_types.h
> @@ -65,6 +65,8 @@ struct xe_late_bind {
> struct workqueue_struct *wq;
> /** @component_added: whether the component has been added */
> bool component_added;
> + /** @disable: to block late binding reload during pm resume
> flow*/
> + bool disable;
> };
>
> #endif
