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Message-ID: <aFVmUN9hVWHWaddi@intel.com>
Date: Fri, 20 Jun 2025 09:46:56 -0400
From: Rodrigo Vivi <rodrigo.vivi@...el.com>
To: "Nilawar, Badal" <badal.nilawar@...el.com>
CC: Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>,
<intel-xe@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
<linux-kernel@...r.kernel.org>, <anshuman.gupta@...el.com>,
<alexander.usyskin@...el.com>, <gregkh@...uxfoundation.org>, <jgg@...dia.com>
Subject: Re: [PATCH v3 08/10] drm/xe/xe_late_bind_fw: Introduce debug fs node
to disable late binding
On Thu, Jun 19, 2025 at 12:21:10PM +0530, Nilawar, Badal wrote:
>
> On 19-06-2025 02:49, Daniele Ceraolo Spurio wrote:
> >
> >
> > On 6/18/2025 12:00 PM, Badal Nilawar wrote:
> > > 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.
> >
> > You haven't replied to my question on the previous rev in regards to the
> > expected use-case here.
> > Is this for testing only, or something an actual user might want to do?
> > If we only need this for testing, please specify so.
>
> Apologies for the oversight. Yes, this is only necessary for testing the
> binary before releasing it for up-streaming. There is internal
> tool which uses IGSC lib to download the binary. To avoid clash between the
> binaries, this debug fs node is provided.
>
> >
> > Also, what happens if we suspend with a user-loaded binary? userspace
> > doesn't have visibility to know that they have to re-load their binary.
>
> If the device enters D3 cold state, the binary needs to be reloaded.
> However, the kernel mode driver (KMD) does not have control over binaries
> downloaded via the IGSC library.
> If needed D3 cold can be disabled from BIOS or by setting up vram_threshold
> = 0.
Acked-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
>
> Regards,
> Badal
>
> > Daniele
> >
> > >
> > > v2:
> > > -s/(uval == 1) ? true : false/!!uval/ (Daniele)
> > >
> > > Signed-off-by: Badal Nilawar <badal.nilawar@...el.com>
> > > ---
> > > 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 | 3 ++
> > > 3 files changed, 47 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 c0be9611c73b..001e526e569a 100644
> > > --- a/drivers/gpu/drm/xe/xe_late_bind_fw.c
> > > +++ b/drivers/gpu/drm/xe/xe_late_bind_fw.c
> > > @@ -129,6 +129,9 @@ int xe_late_bind_fw_load(struct xe_late_bind
> > > *late_bind)
> > > if (!late_bind->component_added)
> > > return -EINVAL;
> > > + if (late_bind->disable)
> > > + return 0;
> > > +
> > > for (fw_id = 0; fw_id < MAX_FW_ID; fw_id++) {
> > > lbfw = &late_bind->late_bind_fw[fw_id];
> > > if (lbfw->valid)
> > > 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 d256f53d59e6..f79f0c0b2c4a 100644
> > > --- a/drivers/gpu/drm/xe/xe_late_bind_fw_types.h
> > > +++ b/drivers/gpu/drm/xe/xe_late_bind_fw_types.h
> > > @@ -71,6 +71,9 @@ struct xe_late_bind {
> > > struct xe_late_bind_fw late_bind_fw[MAX_FW_ID];
> > > /** @late_bind.wq: workqueue to submit request to download
> > > late bind blob */
> > > struct workqueue_struct *wq;
> > > +
> > > + /** @late_bind.disable to block late binding reload during pm
> > > resume flow*/
> > > + bool disable;
> > > };
> > > #endif
> >
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