On Fri, 30 Jan 2026 03:12:02 +0000 "Tian, Kevin" <[email protected]> wrote:
> > From: Jason Gunthorpe <[email protected]> > > Sent: Thursday, January 29, 2026 10:59 PM > > > > On Thu, Jan 29, 2026 at 07:06:37AM +0000, Tian, Kevin wrote: > > > Bear me if it's an ignorant question. > > > > > > The commit msg of patch6 says that VFIO doesn't tolerate unbounded > > > wait, which is the reason behind the 2nd timeout wait here. > > > > As far as I understand dmabuf design a fence wait should complete > > eventually under kernel control, because these sleeps are > > sprinkled all around the kernel today. > > > > I suspect that is not actually true for every HW, probably something > > like "shader programs can run forever technically". > > > > We can argue if those cases should not report revocable either, but at > > least this will work "correctly" even if it takes a huge amount of > > time. > > good to know those background. > > > > > I wouldn't mind seeing a shorter timeout and print on the fence too > > just in case. > > > > either way is OK. It's not difficult to figure out a long wait anyway. 😊 Please don't use Outlook when answering to patches - or ensure that it is properly patched to only send plain text - which I don't think it is possible. If you look on this message source code, it is not in plain text: Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Your message content is: PiBGcm9tOiBKYXNvbiBHdW50aG9ycGUgPGpnZ0B6aWVwZS5jYT4NCj4gU2VudDogVGh1cnNkYXks IEphbnVhcnkgMjksIDIwMjYgMTA6NTkgUE0NCj4gDQo+IE9uIFRodSwgSmFuIDI5LCAyMDI2IGF0 IDA3OjA2OjM3QU0gKzAwMDAsIFRpYW4sIEtldmluIHdyb3RlOg0KPiA+IEJlYXIgbWUgaWYgaXQn cyBhbiBpZ25vcmFudCBxdWVzdGlvbi4NCj4gPg0KPiA+IFRoZSBjb21taXQgbXNnIG9mIHBhdGNo NiBzYXlzIHRoYXQgVkZJTyBkb2Vzbid0IHRvbGVyYXRlIHVuYm91bmRlZA0KPiA+IHdhaXQsIHdo aWNoIGlzIHRoZSByZWFzb24gYmVoaW5kIHRoZSAybmQgdGltZW91dCB3YWl0IGhlcmUuDQo+IA0K PiBBcyBmYXIgYXMgSSB1bmRlcnN0YW5kIGRtYWJ1ZiBkZXNpZ24gYSBmZW5jZSB3YWl0IHNob3Vs ZCBjb21wbGV0ZQ0KPiBldmVudHVhbGx5IHVuZGVyIGtlcm5lbCBjb250cm9sLCBiZWNhdXNlIHRo ZXNlIHNsZWVwcyBhcmUNCj4gc3ByaW5rbGVkIGFsbCBhcm91bmQgdGhlIGtlcm5lbCB0b2RheS4N Cj4gDQo+IEkgc3VzcGVjdCB0aGF0IGlzIG5vdCBhY3R1YWxseSB0cnVlIGZvciBldmVyeSBIVywg cHJvYmFibHkgc29tZXRoaW5nDQo+IGxpa2UgInNoYWRlciBwcm9ncmFtcyBjYW4gcnVuIGZvcmV2 ZXIgdGVjaG5pY2FsbHkiLg0KPiANCj4gV2UgY2FuIGFyZ3VlIGlmIHRob3NlIGNhc2VzIHNob3Vs ZCBub3QgcmVwb3J0IHJldm9jYWJsZSBlaXRoZXIsIGJ1dCBhdA0KPiBsZWFzdCB0aGlzIHdpbGwg d29yayAiY29ycmVjdGx5IiBldmVuIGlmIGl0IHRha2VzIGEgaHVnZSBhbW91bnQgb2YNCj4gdGlt ZS4NCg0KZ29vZCB0byBrbm93IHRob3NlIGJhY2tncm91bmQuDQoNCj4gDQo+IEkgd291bGRuJ3Qg bWluZCBzZWVpbmcgYSBzaG9ydGVyIHRpbWVvdXQgYW5kIHByaW50IG9uIHRoZSBmZW5jZSB0b28N Cj4ganVzdCBpbiBjYXNlLg0KPiANCg0KZWl0aGVyIHdheSBpcyBPSy4gSXQncyBub3QgZGlmZmlj dWx0IHRvIGZpZ3VyZSBvdXQgYSBsb25nIHdhaXQgYW55d2F5LiDwn5iKDQo= which is something that patch tools - in special patchwork - won't handle. Thanks, Mauro
