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(UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: LDl84dvL9RH+mAsa3sEJ4xkTKV+F7gGm/1Tw3dXRlGCPnoyY0a9uUfWUpOd4TcSPajpu8bwQXZJEIvfuVJkfz4l5BddpZlhVL0Js7wmQ+EY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR11MB4896 X-OriginatorOrg: intel.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210521_095056_062384_1D0A52F3 X-CRM114-Status: GOOD ( 42.03 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Fri, 2021-05-21 at 23:57 +0900, Keith Busch wrote: > On Fri, May 21, 2021 at 05:00:29AM +0000, Verma, Vishal L wrote: > > Hi, > > > > I ran into this failure to probe an nvme device in an emulator > > (simics). It looks like there is a ~60 second wait followed by a > > timeout and a failure to boot (the root device is an nvme disk) with > > these messages in the log: > > > > [ 67.174010] nvme nvme0: I/O 5 QID 0 timeout, disable controller > > [ 67.175793] nvme nvme0: Removing after probe failure status: -4 > > > > I bisected this to: > > 5befc7c26e5a ("nvme: implement non-mdts command limits") > > > > It's not immediately obvious to me what's causing the problem. > > Reverting the above commit fixes it. It is easily reproducible - I'd be > > happy to provide more info about the emulated device or test out > > patches or theories. > > > > It is of course possible that the emulated device is behaving in some > > non spec-compliant way, in which case I'd appreciate any help figuring > > out what that is. > > Hi Vishal, > > The patch you bisected to sends only a single Identify command, so it > sounds like that must be the command that times out. The controller is > not required to support this specific identify (CNS 0x6), but it is > required to produce a response. If the identify is unsupported, the > controller should respond with an appropriate error (Invalid Field In > Command), but it looks like the controller didn't respond at all. > > So based on your observation, it sounds like the simics implementation > has an identify bug. The spec doesn't provide a way for the driver to > know ahead of time whether or not this identification is supported, so > the driver just has to try it and react to the status code. If the > implmenetation can't be fixed, then we'll need to quirk your device. > > If you want to confirm for certain that the new identify is the source > of your timeout, you could try the following patch and the timeout > should go away: > > --- > diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c > index 1a73eed61eee..b16d31d82606 100644 > --- a/drivers/nvme/host/core.c > +++ b/drivers/nvme/host/core.c > @@ -2711,7 +2711,7 @@ static int nvme_init_non_mdts_limits(struct nvme_ctrl *ctrl) > else > ctrl->max_zeroes_sectors = 0; > > - if (nvme_ctrl_limited_cns(ctrl)) > + if (true || nvme_ctrl_limited_cns(ctrl)) > return 0; > > id = kzalloc(sizeof(*id), GFP_KERNEL); > -- Hi Keith, Thanks for looking into it - yes with that the problem goes away. Let me chat with the simics folks and see if I can get them to fix it. _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme