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Message-ID: <120875582.20150515004429@eikelenboom.it> Date: Fri, 15 May 2015 00:44:29 +0200 From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, David Vrabel <david.vrabel@...rix.com> To: Sander Eikelenboom <linux@...elenboom.it> CC: "Rafael J. Wysocki" <rjw@...ysocki.net>, rafael.j.wysocki@...el.com, <linux-acpi@...r.kernel.org>, xen-devel <xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org> Subject: Re: Regression due to "device property: Make it possible to use secondary firmware nodes" Re: Xen-unstable + linux 4.1-mergewindow: problems with PV guest pci passthrough: pcifront pci-0: pciback not responding!!! Hi Konrad / David, One a big snip on this thread, got some more debug info, hopefully this will lead to something: On a working kernel (with the two seemingly non related patches reverted) i get: [ 0.717796] pcifront pci-0: Allocated pdev @ 0xffff880019e11780 pdev->sh_info @ 0xffff880018f58000 [ 0.717848] pcifront pci-0: ?!?!? before alloc gntref: 0 [ 0.717871] pcifront pci-0: ?!?!? after alloc gntref: 8 [ 0.717892] pcifront pci-0: ?!?!? before alloc evtchn: -1 [ 0.717915] pcifront pci-0: ?!?!? after alloc evtchn: 17 [ 0.717984] pcifront pci-0: ?!?!? bound evtchn:17 to irqhandler:-1 err:31 [ 0.721640] pcifront pci-0: publishing successful! [ 0.723684] usbcore: registered new interface driver udlfb [ 0.724664] xen:xen_evtchn: Event-channel device installed [ 0.726597] pcifront pci-0: Installing PCI frontend [ 0.726853] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled [ 0.727059] pcifront pci-0: Creating PCI Frontend Bus 0000:00 [ 0.727363] pcifront pci-0: PCI host bridge to bus 0000:00 [ 0.727391] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] [ 0.727417] pci_bus 0000:00: root bus resource [mem 0x00000000-0xffffffffffff] [ 0.727452] pci_bus 0000:00: root bus resource [bus 00-ff] [ 0.727475] pci_bus 0000:00: scanning bus [ 0.727503] pcifront pci-0: read dev=0000:00:00.0 - offset 0 size 4 [ 0.728253] Linux agpgart interface v0.103 [ 0.728387] Hangcheck: starting hangcheck timer 0.9.1 (tick is 180 seconds, margin is 60 seconds). [ 0.728474] [drm] Initialized drm 1.1.0 20060810 [ 0.728551] [drm] radeon kernel modesetting enabled. [ 0.730319] pcifront pci-0: ?!?!? pciback responded !!! irq:31 irq_flags:ffff880019e100a8 ns: 1431641785551700000 ns_timeout: 1431641787541235000 evtchn:17 gnt_ref:8 [ 0.730319] pcifront pci-0: ?!?!? op cmd:0 err:0 info:0 offset:0 size:4 [ 0.730319] pcifront pci-0: ?!?!? active_op cmd:0 err:0 info:0 offset:0 size:4 [ 0.730319] pcifront pci-0: read got back value 11113f6 [ 0.738845] pcifront pci-0: read dev=0000:00:00.0 - offset e size 1 [ 0.744976] brd: module loaded [ 0.745204] pcifront pci-0: ?!?!? pciback responded !!! irq:31 irq_flags:ffff880019e100a8 ns: 1431641785562852000 ns_timeout: 1431641787552580000 evtchn:17 gnt_ref:8 [ 0.745204] pcifront pci-0: ?!?!? op cmd:0 err:0 info:0 offset:14 size:1 [ 0.745204] pcifront pci-0: ?!?!? active_op cmd:0 err:0 info:0 offset:14 size:1 [ 0.745204] pcifront pci-0: read got back value 0 [ 0.749204] pcifront pci-0: read dev=0000:00:00.0 - offset 6 size 2 [ 0.750155] loop: module loaded [ 0.752527] pcifront pci-0: ?!?!? pciback responded !!! irq:31 irq_flags:ffff880019e100a8 ns: 1431641785570841000 ns_timeout: 1431641787562917000 evtchn:17 gnt_ref:8 [ 0.752527] pcifront pci-0: ?!?!? op cmd:0 err:0 info:0 offset:6 size:2 [ 0.752527] pcifront pci-0: ?!?!? active_op cmd:0 err:0 info:0 offset:6 size:2 [ 0.752527] pcifront pci-0: read got back value 210 [ 0.757187] pcifront pci-0: read dev=0000:00:00.0 - offset 34 size 1 Were as in the non-working situation i get: [ 0.751244] pcifront pci-0: Allocated pdev @ 0xffff880019ec2e00 pdev->sh_info @ 0xffff88001aa51000 [ 0.751295] pcifront pci-0: ?!?!? before alloc gntref: 0 [ 0.751315] pcifront pci-0: ?!?!? after alloc gntref: 8 [ 0.751334] pcifront pci-0: ?!?!? before alloc evtchn: -1 [ 0.751355] pcifront pci-0: ?!?!? after alloc evtchn: 17 [ 0.751422] pcifront pci-0: ?!?!? bound evtchn:17 to irqhandler:-1 err:31 [ 0.755215] pcifront pci-0: publishing successful! [ 0.757341] usbcore: registered new interface driver udlfb [ 0.758365] xen:xen_evtchn: Event-channel device installed [ 0.760419] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled [ 0.760819] pcifront pci-0: Installing PCI frontend [ 0.761518] pcifront pci-0: Creating PCI Frontend Bus 0000:00 [ 0.761684] pcifront pci-0: PCI host bridge to bus 0000:00 [ 0.761710] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] [ 0.761733] pci_bus 0000:00: root bus resource [mem 0x00000000-0xffffffffffff] [ 0.761763] pci_bus 0000:00: root bus resource [bus 00-ff] [ 0.761783] pci_bus 0000:00: scanning bus [ 0.761805] pcifront pci-0: read dev=0000:00:00.0 - offset 0 size 4 [ 0.767207] Linux agpgart interface v0.103 [ 0.767362] Hangcheck: starting hangcheck timer 0.9.1 (tick is 180 seconds, margin is 60 seconds). [ 0.767439] [drm] Initialized drm 1.1.0 20060810 [ 0.767515] [drm] radeon kernel modesetting enabled. [ 0.766948] pcifront pci-0: pciback not responding!!! irq:31 irq_flags:ffff880019ec0028 ns: 1431641983026498000 ns_timeout: 1431641983026497000 evtchn:0 gnt_ref:0 [ 0.766948] pcifront pci-0: ?!?!? op cmd:0 err:0 info:0 offset:0 size:4 [ 0.766948] pcifront pci-0: ?!?!? active_op cmd:0 err:0 info:0 offset:0 size:4 [ 0.766948] pcifront pci-0: other err read got back err: ffffffff value: 0 [ 2.762062] pcifront pci-0: read dev=0000:00:01.0 - offset 0 size 4 [ 2.765203] pcifront pci-0: pciback not responding!!! irq:31 irq_flags:ffff880019ec0028 ns: 1431641985026742000 ns_timeout: 1431641985026741000 evtchn:0 gnt_ref:0 [ 2.765203] pcifront pci-0: ?!?!? op cmd:0 err:0 info:0 offset:0 size:4 [ 2.765203] pcifront pci-0: ?!?!? active_op cmd:0 err:0 info:0 offset:0 size:4 [ 2.765203] pcifront pci-0: other err read got back err: ffffffff value: 0 [ 4.762172] pcifront pci-0: read dev=0000:00:02.0 - offset 0 size 4 [ 4.764231] brd: module loaded [ 4.765508] loop: module loaded [ 4.766748] pcifront pci-0: pciback not responding!!! irq:31 irq_flags:ffff880019ec0028 ns: 1431641987026850000 ns_timeout: 1431641987026849000 evtchn:0 gnt_ref:0 [ 4.766748] pcifront pci-0: ?!?!? op cmd:0 err:0 info:0 offset:0 size:4 [ 4.766748] pcifront pci-0: ?!?!? active_op cmd:0 err:0 info:0 offset:0 size:4 [ 4.766748] pcifront pci-0: other err read got back err: ffffffff value: 0 [ 6.762248] pcifront pci-0: read dev=0000:00:03.0 - offset 0 size 4 [ 6.765545] pcifront pci-0: pciback not responding!!! irq:31 irq_flags:ffff880019ec0028 ns: 1431641989026930000 ns_timeout: 1431641989026929000 evtchn:0 gnt_ref:0 [ 6.765545] pcifront pci-0: ?!?!? op cmd:0 err:0 info:0 offset:0 size:4 [ 6.765545] pcifront pci-0: ?!?!? active_op cmd:0 err:0 info:0 offset:0 size:4 [ 6.765545] pcifront pci-0: other err read got back err: ffffffff value: 0 [ 8.762329] pcifront pci-0: read dev=0000:00:04.0 - offset 0 size 4 [ 8.765626] pcifront pci-0: pciback not responding!!! irq:31 irq_flags:ffff880019ec0028 ns: 1431641991027006000 ns_timeout: 1431641991027005000 evtchn:0 gnt_ref:0 [ 8.765626] pcifront pci-0: ?!?!? op cmd:0 err:0 info:0 offset:0 size:4 [ 8.765626] pcifront pci-0: ?!?!? active_op cmd:0 err:0 info:0 offset:0 size:4 [ 8.765626] pcifront pci-0: other err read got back err: ffffffff value: 0 [ 10.762410] pcifront pci-0: read dev=0000:00:05.0 - offset 0 size 4 [ 10.765701] pcifront pci-0: pciback not responding!!! irq:31 irq_flags:ffff880019ec0028 ns: 1431641993027087000 ns_timeout: 1431641993027086000 evtchn:0 gnt_ref:0 [ 10.765701] pcifront pci-0: ?!?!? op cmd:0 err:0 info:0 offset:0 size:4 [ 10.765701] pcifront pci-0: ?!?!? active_op cmd:0 err:0 info:0 offset:0 size:4 [ 10.765701] pcifront pci-0: other err read got back err: ffffffff value: 0 [ 12.762472] pcifront pci-0: read dev=0000:00:06.0 - offset 0 size 4 So somehow in the non-working situation, pdev->evtchn and pdev->gnt_ref are 0 in xen-pcifront.c:do_pci_op(), so no wonder it's not getting a response back ... Question is .. why ? -- Sander -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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