* `pcilib: sysfs_read_vpd: read failed: Input/output error` on ASRock E350M1
@ 2016-05-15 16:56 Paul Menzel
2016-05-16 18:02 ` Myron Stowe
0 siblings, 1 reply; 8+ messages in thread
From: Paul Menzel @ 2016-05-15 16:56 UTC (permalink / raw)
To: Bjorn Helgaas; +Cc: linux-pci
[-- Attachment #1: Type: text/plain, Size: 3792 bytes --]
Dear Bjorn,
running Linux 4.6.0-rc5-686-pae from Debian experimental, running
`lspci -vv` on the ASRock E350M1 gives the error below. This wasn’t
there with Linux 4.6-rc3.
```
$ sudo lspci -s 3:0 -vv
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
Subsystem: ASRock Incorporation Motherboard (one of many)
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 26
Region 0: I/O ports at 1000 [size=256]
Region 2: Memory at f0004000 (64-bit, prefetchable) [size=4K]
Region 4: Memory at f0000000 (64-bit, prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Address: 00000000fee0300c Data: 41d1
Capabilities: [70] Express (v2) Endpoint, MSI 01
DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <512ns, L1 <64us
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 4096 bytes
DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <512ns, L1 <64us
ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Not Supported, TimeoutDis+, LTR-, OBFF Not Supported
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
Capabilities: [b0] MSI-X: Enable- Count=4 Masked-
Vector table: BAR=4 offset=00000000
PBA: BAR=4 offset=00000800
Capabilities: [d0] Vital Product Data
pcilib: sysfs_read_vpd: read failed: Input/output error
Not readable
Capabilities: [100 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
Capabilities: [140 v1] Virtual Channel
Caps: LPEVC=0 RefClk=100ns PATEntryBits=1
Arb: Fixed- WRR32- WRR64- WRR128-
Ctrl: ArbSelect=Fixed
Status: InProgress-
VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
Status: NegoPending- InProgress-
Capabilities: [160 v1] Device Serial Number 01-00-00-00-68-4c-e0-00
Kernel driver in use: r8169
Kernel modules: r8169
```
Is that related to [1]?
Thanks,
Paul
[1] https://lkml.org/lkml/2016/4/15/649
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: `pcilib: sysfs_read_vpd: read failed: Input/output error` on ASRock E350M1
2016-05-15 16:56 `pcilib: sysfs_read_vpd: read failed: Input/output error` on ASRock E350M1 Paul Menzel
@ 2016-05-16 18:02 ` Myron Stowe
2016-05-16 20:37 ` Paul Menzel
0 siblings, 1 reply; 8+ messages in thread
From: Myron Stowe @ 2016-05-16 18:02 UTC (permalink / raw)
To: Paul Menzel; +Cc: Bjorn Helgaas, linux-pci
On Sun, May 15, 2016 at 10:56 AM, Paul Menzel
<paulepanter@users.sourceforge.net> wrote:
> Dear Bjorn,
>
>
> running Linux 4.6.0-rc5-686-pae from Debian experimental, running
> `lspci -vv` on the ASRock E350M1 gives the error below. This wasn’t
> there with Linux 4.6-rc3.
>
> ```
> $ sudo lspci -s 3:0 -vv
> 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
> Subsystem: ASRock Incorporation Motherboard (one of many)
> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
> Latency: 0, Cache Line Size: 64 bytes
> Interrupt: pin A routed to IRQ 26
> Region 0: I/O ports at 1000 [size=256]
> Region 2: Memory at f0004000 (64-bit, prefetchable) [size=4K]
> Region 4: Memory at f0000000 (64-bit, prefetchable) [size=16K]
> Capabilities: [40] Power Management version 3
> Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
> Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
> Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
> Address: 00000000fee0300c Data: 41d1
> Capabilities: [70] Express (v2) Endpoint, MSI 01
> DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <512ns, L1 <64us
> ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
> DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
> RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
> MaxPayload 128 bytes, MaxReadReq 4096 bytes
> DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
> LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <512ns, L1 <64us
> ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp-
> LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
> ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
> DevCap2: Completion Timeout: Not Supported, TimeoutDis+, LTR-, OBFF Not Supported
> DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
> LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
> Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
> Compliance De-emphasis: -6dB
> LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1-
> EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
> Capabilities: [b0] MSI-X: Enable- Count=4 Masked-
> Vector table: BAR=4 offset=00000000
> PBA: BAR=4 offset=00000800
> Capabilities: [d0] Vital Product Data
> pcilib: sysfs_read_vpd: read failed: Input/output error
> Not readable
It looks as if reading the first byte(s) of VPD to decode the
"resource data types/tags" and "keywords" returned '0'. Since that is
invalid (i.e. does not conform to a properly formatted "tag") 'lspci'
aborted any further accessing and returned "Not readable" (this sounds
very similar to what happens on a Serial Attached SCSI controller: LSI
Logic / Symbios Logic SAS2308 PCI-Express Fusion-MPT SAS-2 device
which, while denoting it has VPD via the Express capability, doe not -
the data area is all 0's.
> Capabilities: [100 v1] Advanced Error Reporting
> UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
> UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
> UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
> CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
> CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
> AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
> Capabilities: [140 v1] Virtual Channel
> Caps: LPEVC=0 RefClk=100ns PATEntryBits=1
> Arb: Fixed- WRR32- WRR64- WRR128-
> Ctrl: ArbSelect=Fixed
> Status: InProgress-
> VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
> Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
> Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
> Status: NegoPending- InProgress-
> Capabilities: [160 v1] Device Serial Number 01-00-00-00-68-4c-e0-00
> Kernel driver in use: r8169
> Kernel modules: r8169
> ```
>
> Is that related to [1]?
>
There have been a number of recent kernel commits to work-around know
buggy devices -
v4.6-rc5
67e6587 cxgb4: Set VPD size so we can read both VPD structures
cb92148 PCI: Add pci_set_vpd_size() to set VPD size
v4.6 -
7c20078 PCI: Prevent VPD access for buggy devices
c521b01 PCI: Sleep rather than busy-wait for VPD access completion
408641e PCI: Fold struct pci_vpd_pci22 into struct pci_vpd
f1cd93f PCI: Rename VPD symbols to remove unnecessary "pci22"
da00684 PCI: Remove struct pci_vpd_ops.release function pointer
6437907 PCI: Move pci_vpd_release() from header file to pci/access.c
fc0a407 PCI: Move pci_read_vpd() and pci_write_vpd() close to other code
104daa7 PCI: Determine actual VPD size on first access
c556388 PCI: Use bitfield instead of bool for struct pci_vpd_pci22.busy
f52e562 PCI: Allow access to VPD attributes with size 0
9eb45d5 PCI: Update VPD definitions
v4.3 -
da2d03e PCI: Use function 0 VPD only for identical functions
9d92407 PCI: Fix devfn for VPD access through function 0
7aa6ca4 PCI: Add VPD function 0 quirk for Intel Ethernet devices
932c435 PCI: Add dev_flags bit to access VPD through function 0
What were you getting/seeing before?
Myron
>
> Thanks,
>
> Paul
>
>
> [1] https://lkml.org/lkml/2016/4/15/649
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: `pcilib: sysfs_read_vpd: read failed: Input/output error` on ASRock E350M1
2016-05-16 18:02 ` Myron Stowe
@ 2016-05-16 20:37 ` Paul Menzel
2016-05-17 1:42 ` Myron Stowe
0 siblings, 1 reply; 8+ messages in thread
From: Paul Menzel @ 2016-05-16 20:37 UTC (permalink / raw)
To: Myron Stowe; +Cc: Bjorn Helgaas, linux-pci
[-- Attachment #1: Type: text/plain, Size: 2034 bytes --]
Dear Myron,
thank you for your response.
Am Montag, den 16.05.2016, 12:02 -0600 schrieb Myron Stowe:
> On Sun, May 15, 2016 at 10:56 AM, Paul Menzel wrote:
[…]
> > Is that related to [1]?
>
> There have been a number of recent kernel commits to work-around know
> buggy devices -
> v4.6-rc5
> 67e6587 cxgb4: Set VPD size so we can read both VPD structures
> cb92148 PCI: Add pci_set_vpd_size() to set VPD size
> v4.6 -
> 7c20078 PCI: Prevent VPD access for buggy devices
> c521b01 PCI: Sleep rather than busy-wait for VPD access completion
> 408641e PCI: Fold struct pci_vpd_pci22 into struct pci_vpd
> f1cd93f PCI: Rename VPD symbols to remove unnecessary "pci22"
> da00684 PCI: Remove struct pci_vpd_ops.release function pointer
> 6437907 PCI: Move pci_vpd_release() from header file to pci/access.c
> fc0a407 PCI: Move pci_read_vpd() and pci_write_vpd() close to other code
> 104daa7 PCI: Determine actual VPD size on first access
> c556388 PCI: Use bitfield instead of bool for struct pci_vpd_pci22.busy
> f52e562 PCI: Allow access to VPD attributes with size 0
> 9eb45d5 PCI: Update VPD definitions
> v4.3 -
> da2d03e PCI: Use function 0 VPD only for identical functions
> 9d92407 PCI: Fix devfn for VPD access through function 0
> 7aa6ca4 PCI: Add VPD function 0 quirk for Intel Ethernet devices
> 932c435 PCI: Add dev_flags bit to access VPD through function 0
>
> What were you getting/seeing before?
The error wasn’t shown. Sorry if that is not a helpful answer. If I
provide more information, please tell me how I can get them.
You can find a lot of lspci output for the ASRock E350M1 in coreboot’s
board status repository [2].
Thanks,
Paul
> > [1] https://lkml.org/lkml/2016/4/15/649
[2] http://review.coreboot.org/cgit/board-status.git/tree/asrock/e350m1
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: `pcilib: sysfs_read_vpd: read failed: Input/output error` on ASRock E350M1
2016-05-16 20:37 ` Paul Menzel
@ 2016-05-17 1:42 ` Myron Stowe
2016-05-17 21:21 ` Paul Menzel
0 siblings, 1 reply; 8+ messages in thread
From: Myron Stowe @ 2016-05-17 1:42 UTC (permalink / raw)
To: Paul Menzel; +Cc: Bjorn Helgaas, linux-pci
On Mon, May 16, 2016 at 2:37 PM, Paul Menzel
<paulepanter@users.sourceforge.net> wrote:
> Dear Myron,
>
>
> thank you for your response.
>
>
> Am Montag, den 16.05.2016, 12:02 -0600 schrieb Myron Stowe:
>> On Sun, May 15, 2016 at 10:56 AM, Paul Menzel wrote:
>
> […]
>
>> > Is that related to [1]?
>>
>> There have been a number of recent kernel commits to work-around know
>> buggy devices -
>> v4.6-rc5
>> 67e6587 cxgb4: Set VPD size so we can read both VPD structures
>> cb92148 PCI: Add pci_set_vpd_size() to set VPD size
>> v4.6 -
>> 7c20078 PCI: Prevent VPD access for buggy devices
>> c521b01 PCI: Sleep rather than busy-wait for VPD access completion
>> 408641e PCI: Fold struct pci_vpd_pci22 into struct pci_vpd
>> f1cd93f PCI: Rename VPD symbols to remove unnecessary "pci22"
>> da00684 PCI: Remove struct pci_vpd_ops.release function pointer
>> 6437907 PCI: Move pci_vpd_release() from header file to pci/access.c
>> fc0a407 PCI: Move pci_read_vpd() and pci_write_vpd() close to other code
>> 104daa7 PCI: Determine actual VPD size on first access
>> c556388 PCI: Use bitfield instead of bool for struct pci_vpd_pci22.busy
>> f52e562 PCI: Allow access to VPD attributes with size 0
>> 9eb45d5 PCI: Update VPD definitions
>> v4.3 -
>> da2d03e PCI: Use function 0 VPD only for identical functions
>> 9d92407 PCI: Fix devfn for VPD access through function 0
>> 7aa6ca4 PCI: Add VPD function 0 quirk for Intel Ethernet devices
>> 932c435 PCI: Add dev_flags bit to access VPD through function 0
>>
>> What were you getting/seeing before?
>
> The error wasn’t shown. Sorry if that is not a helpful answer. If I
> provide more information, please tell me how I can get them.
I expect that prior to the kernel updates you were seeing:
lspci -s 3:0 -vv
...
Capabilities: [d0] Vital Product Data
Unknown small resource type 00, will not decode more.
...
and with 'xxd', looking at the VPD area you likely would have seen:
# xxd /sys/bus/pci/devices/0000\:03\:00.0/vpd
0000000: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0000010: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0000020: 0000 0000 0000 0000 0000 0000 0000 0000 ................
...
and nothing in the 'dmesg' logs.
With the recent kernel updates you see the new output from the kernel
and 'lspci -vv' that started this thread. I expect that you also get
something close to the following from 'xxd':
# xxd /sys/bus/pci/devices/0000\:03\:00.0/vpd
xxd: Input/output error
and also see the following in the 'dmesg' logs.
# dmesg | grep VPD
r8169 0000:03:00.0: invalid short VPD tag 00 at offset 1
The new kernel behavior is correct in its complaint as the device is
advertising that it has VPD via a 'capability' yet its VPD data area
is likely all 0's. This is a device error - specifically an error
with the device's firmware: either it should _not_ advertise via the
'capability' that it has VPD or, it s VPD area needs to conform to the
VPD data format as expressed in the "PCI Local Bus Specification, Rev.
3.0" appendix I - "Vital Product Data".
With the new kernel behavior, effectively circumventing reading of an
invalid VPD area, you can't get to the data via "# xxd" (as shown
above). You could run a kernel prior to the changes and run the "xxd"
command and likely see that the VPD area is all 0's. I would be
interested in confirming such if you could do so please.
Thanks,
Myron
>
> You can find a lot of lspci output for the ASRock E350M1 in coreboot’s
> board status repository [2].
>
>
> Thanks,
>
> Paul
>
>
>> > [1] https://lkml.org/lkml/2016/4/15/649
> [2] http://review.coreboot.org/cgit/board-status.git/tree/asrock/e350m1
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: `pcilib: sysfs_read_vpd: read failed: Input/output error` on ASRock E350M1
2016-05-17 1:42 ` Myron Stowe
@ 2016-05-17 21:21 ` Paul Menzel
2016-05-18 1:52 ` Myron Stowe
0 siblings, 1 reply; 8+ messages in thread
From: Paul Menzel @ 2016-05-17 21:21 UTC (permalink / raw)
To: Myron Stowe; +Cc: Bjorn Helgaas, linux-pci
[-- Attachment #1: Type: text/plain, Size: 4922 bytes --]
Dear Myron,
Am Montag, den 16.05.2016, 19:42 -0600 schrieb Myron Stowe:
> On Mon, May 16, 2016 at 2:37 PM, Paul Menzel wrote:
> > Am Montag, den 16.05.2016, 12:02 -0600 schrieb Myron Stowe:
> > >
> > > On Sun, May 15, 2016 at 10:56 AM, Paul Menzel wrote:
> > […]
> > > >
> > > > Is that related to [1]?
> > > There have been a number of recent kernel commits to work-around know
> > > buggy devices -
> > > v4.6-rc5
> > > 67e6587 cxgb4: Set VPD size so we can read both VPD structures
> > > cb92148 PCI: Add pci_set_vpd_size() to set VPD size
> > > v4.6 -
> > > 7c20078 PCI: Prevent VPD access for buggy devices
> > > c521b01 PCI: Sleep rather than busy-wait for VPD access completion
> > > 408641e PCI: Fold struct pci_vpd_pci22 into struct pci_vpd
> > > f1cd93f PCI: Rename VPD symbols to remove unnecessary "pci22"
> > > da00684 PCI: Remove struct pci_vpd_ops.release function pointer
> > > 6437907 PCI: Move pci_vpd_release() from header file to pci/access.c
> > > fc0a407 PCI: Move pci_read_vpd() and pci_write_vpd() close to other code
> > > 104daa7 PCI: Determine actual VPD size on first access
> > > c556388 PCI: Use bitfield instead of bool for struct pci_vpd_pci22.busy
> > > f52e562 PCI: Allow access to VPD attributes with size 0
> > > 9eb45d5 PCI: Update VPD definitions
> > > v4.3 -
> > > da2d03e PCI: Use function 0 VPD only for identical functions
> > > 9d92407 PCI: Fix devfn for VPD access through function 0
> > > 7aa6ca4 PCI: Add VPD function 0 quirk for Intel Ethernet devices
> > > 932c435 PCI: Add dev_flags bit to access VPD through function 0
> > >
> > > What were you getting/seeing before?
> > The error wasn’t shown. Sorry if that is not a helpful answer. If I
> > provide more information, please tell me how I can get them.
> I expect that prior to the kernel updates you were seeing:
>
> lspci -s 3:0 -vv
> ...
> Capabilities: [d0] Vital Product Data
> Unknown small resource type 00, will not decode more.
> ...
From logs stored in coreboot’s board status repository [2].
```
$ more asrock/e350m1/4.3-817-g477a0d6/2016-04-22T18_41_34Z/lspci-vvxxx.txt
[…]
Capabilities: [d0] Vital Product Data
No end tag found
[…]
```
> and with 'xxd', looking at the VPD area you likely would have seen:
>
> # xxd /sys/bus/pci/devices/0000\:03\:00.0/vpd
> 0000000: 0000 0000 0000 0000 0000 0000 0000 0000 ................
> 0000010: 0000 0000 0000 0000 0000 0000 0000 0000 ................
> 0000020: 0000 0000 0000 0000 0000 0000 0000 0000 ................
> ...
>
> and nothing in the 'dmesg' logs.
```
$ more asrock/e350m1/4.3-817-g477a0d6/2016-04-22T18_41_34Z/lspci-vvxxx.txt
[…]
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 10 00 01 01 01 12 63 80 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 80 80 00 00 00 00 00 00 00 00 00
[…]
```
There is nothing in the Linux 3.16 messages.
> With the recent kernel updates you see the new output from the kernel
> and 'lspci -vv' that started this thread. I expect that you also get
> something close to the following from 'xxd':
>
> # xxd /sys/bus/pci/devices/0000\:03\:00.0/vpd
> xxd: Input/output error
Correct.
> and also see the following in the 'dmesg' logs.
>
> # dmesg | grep VPD
> r8169 0000:03:00.0: invalid short VPD tag 00 at offset 1
Indeed similar:
```
$ dmesg | grep VPD
[15841.258561] r8169 0000:03:00.0: invalid large VPD tag 7f at offset 0
```
> The new kernel behavior is correct in its complaint as the device is
> advertising that it has VPD via a 'capability' yet its VPD data area
> is likely all 0's. This is a device error - specifically an error
> with the device's firmware: either it should _not_ advertise via the
> 'capability' that it has VPD or, it s VPD area needs to conform to the
> VPD data format as expressed in the "PCI Local Bus Specification, Rev.
> 3.0" appendix I - "Vital Product Data".
>
> With the new kernel behavior, effectively circumventing reading of an
> invalid VPD area, you can't get to the data via "# xxd" (as shown
> above). You could run a kernel prior to the changes and run the "xxd"
> command and likely see that the VPD area is all 0's. I would be
> interested in confirming such if you could do so please.
Please see the paste above. Please tell me if I missed something.
So what to do about this? Contact Realtek? Add a workaround?
Thanks,
Paul
> > > > [1] https://lkml.org/lkml/2016/4/15/649
> > [2] http://review.coreboot.org/cgit/board-status.git/tree/asrock/e350m1
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: `pcilib: sysfs_read_vpd: read failed: Input/output error` on ASRock E350M1
2016-05-17 21:21 ` Paul Menzel
@ 2016-05-18 1:52 ` Myron Stowe
2016-05-21 20:18 ` Paul Menzel
0 siblings, 1 reply; 8+ messages in thread
From: Myron Stowe @ 2016-05-18 1:52 UTC (permalink / raw)
To: Paul Menzel; +Cc: Bjorn Helgaas, linux-pci
On Tue, May 17, 2016 at 3:21 PM, Paul Menzel
<paulepanter@users.sourceforge.net> wrote:
> Dear Myron,
>
>
> Am Montag, den 16.05.2016, 19:42 -0600 schrieb Myron Stowe:
>> On Mon, May 16, 2016 at 2:37 PM, Paul Menzel wrote:
>
>> > Am Montag, den 16.05.2016, 12:02 -0600 schrieb Myron Stowe:
>> > >
>> > > On Sun, May 15, 2016 at 10:56 AM, Paul Menzel wrote:
>> > […]
>> > > >
>> > > > Is that related to [1]?
>> > > There have been a number of recent kernel commits to work-around know
>> > > buggy devices -
>> > > v4.6-rc5
>> > > 67e6587 cxgb4: Set VPD size so we can read both VPD structures
>> > > cb92148 PCI: Add pci_set_vpd_size() to set VPD size
>> > > v4.6 -
>> > > 7c20078 PCI: Prevent VPD access for buggy devices
>> > > c521b01 PCI: Sleep rather than busy-wait for VPD access completion
>> > > 408641e PCI: Fold struct pci_vpd_pci22 into struct pci_vpd
>> > > f1cd93f PCI: Rename VPD symbols to remove unnecessary "pci22"
>> > > da00684 PCI: Remove struct pci_vpd_ops.release function pointer
>> > > 6437907 PCI: Move pci_vpd_release() from header file to pci/access.c
>> > > fc0a407 PCI: Move pci_read_vpd() and pci_write_vpd() close to other code
>> > > 104daa7 PCI: Determine actual VPD size on first access
>> > > c556388 PCI: Use bitfield instead of bool for struct pci_vpd_pci22.busy
>> > > f52e562 PCI: Allow access to VPD attributes with size 0
>> > > 9eb45d5 PCI: Update VPD definitions
>> > > v4.3 -
>> > > da2d03e PCI: Use function 0 VPD only for identical functions
>> > > 9d92407 PCI: Fix devfn for VPD access through function 0
>> > > 7aa6ca4 PCI: Add VPD function 0 quirk for Intel Ethernet devices
>> > > 932c435 PCI: Add dev_flags bit to access VPD through function 0
>> > >
>> > > What were you getting/seeing before?
>> > The error wasn’t shown. Sorry if that is not a helpful answer. If I
>> > provide more information, please tell me how I can get them.
>> I expect that prior to the kernel updates you were seeing:
>>
>> lspci -s 3:0 -vv
>> ...
>> Capabilities: [d0] Vital Product Data
>> Unknown small resource type 00, will not decode more.
>> ...
>
> From logs stored in coreboot’s board status repository [2].
>
> ```
> $ more asrock/e350m1/4.3-817-g477a0d6/2016-04-22T18_41_34Z/lspci-vvxxx.txt
> […]
> Capabilities: [d0] Vital Product Data
> No end tag found
> […]
> ```
The above - "No end tag found" - is from 'lspci' reading the VPD area
and parsing it looking for an small resource data type "End Tag"
(0x0f) and never finding one. Thus it seems like the VPD area is
malformed at best.
>
>> and with 'xxd', looking at the VPD area you likely would have seen:
>>
>> # xxd /sys/bus/pci/devices/0000\:03\:00.0/vpd
>> 0000000: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>> 0000010: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>> 0000020: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>> ...
>>
>> and nothing in the 'dmesg' logs.
>
> ```
> $ more asrock/e350m1/4.3-817-g477a0d6/2016-04-22T18_41_34Z/lspci-vvxxx.txt
> […]
> c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> e0: 10 00 01 01 01 12 63 80 00 00 00 00 00 00 00 00
> f0: 00 00 00 00 00 80 80 00 00 00 00 00 00 00 00 00
> […]
> ```
Careful here, the above is _not_ the VPD area. The above is the
device's standard PCI (type 0) configuration header registers [I'm
thinking you mistook the 0xd0 from "Capabilities: [d0] Vital Product
Data" and thought that was the offset for the VPD area - it is not.
To get to the VPD area one has to manipulate a couple of VPD registers
which is basically obtaining the VPD bytes from within the device
itself (i.e. from within the device's firmware)].
To get the VPD area you will need to run a kernel prior to the commits
I pointed out and then use 'xxd' as shown above to gain insight into
what, if anything, is really there.
>
> There is nothing in the Linux 3.16 messages.
>
>> With the recent kernel updates you see the new output from the kernel
>> and 'lspci -vv' that started this thread. I expect that you also get
>> something close to the following from 'xxd':
>>
>> # xxd /sys/bus/pci/devices/0000\:03\:00.0/vpd
>> xxd: Input/output error
>
> Correct.
>
>> and also see the following in the 'dmesg' logs.
>>
>> # dmesg | grep VPD
>> r8169 0000:03:00.0: invalid short VPD tag 00 at offset 1
>
> Indeed similar:
>
> ```
> $ dmesg | grep VPD
> [15841.258561] r8169 0000:03:00.0: invalid large VPD tag 7f at offset 0
> ```
Humm, the above is interesting to me in that it implies that the VPD
area is not necessarily all 0's as I was expecting. A "Large VPD tag"
is denoted by the most significant bit of the first byte being set.
However, the value denoted - 0x7f - does not have the MSB set so now
I'm a bit confused (perhaps the MSB is stripped off - I'll need to
look at the related code). Either way, its looking like perhaps the
VPD area is not all 0's so I'd really be interested in knowing what is
there.
Ok, looking at the code - ./drivers/pci/access.c::pci_vpd_size() - the
tag value output - 7f - had its MSB stripped off via
'pci_vpd_lrdt_tag()'. So what must have been read for the first byte
was 0xff.
>
>> The new kernel behavior is correct in its complaint as the device is
>> advertising that it has VPD via a 'capability' yet its VPD data area
>> is likely all 0's. This is a device error - specifically an error
>> with the device's firmware: either it should _not_ advertise via the
>> 'capability' that it has VPD or, it s VPD area needs to conform to the
>> VPD data format as expressed in the "PCI Local Bus Specification, Rev.
>> 3.0" appendix I - "Vital Product Data".
>>
>> With the new kernel behavior, effectively circumventing reading of an
>> invalid VPD area, you can't get to the data via "# xxd" (as shown
>> above). You could run a kernel prior to the changes and run the "xxd"
>> command and likely see that the VPD area is all 0's. I would be
>> interested in confirming such if you could do so please.
>
> Please see the paste above. Please tell me if I missed something.
I have to admit I'm a bit surprised at this point (that the VPD area
is not all 0's as I was expecting). The only way we'll know is to
obtain the VPD area - if you can get that via 'xxd' it would be
interesting to see what is there exactly.
>
> So what to do about this? Contact Realtek? Add a workaround?
The VPD area is almost certainly malformed (or doesn't exist at all).
As a colleague of mine noted today, LSI devices seem to be especially
negligent in this manner (see commit 7c20078 ("PCI: Prevent VPD access
for buggy devices")). Assuming the VPD area of this device is at best
invalid then the kernel is correct in its current behavior - not much
more it can do. While it would be good for the device's firmware to
be upgraded to either not advertise it has VPD or to put in valid VPD,
I very much doubt you'd get any traction there. You could try adding
this device's signature (device and vendor id) to the 7c20078 quirk
and see if there is any subtle difference. If there was, it'd be very
subtle at best.
All that aside, you are just questioning the error output - correct
(i.e. you are not expecting, nor needing, valid VPD content for some
reason and questioning that I assume)?
Myron
>
>
> Thanks,
>
> Paul
>
>
>> > > > [1] https://lkml.org/lkml/2016/4/15/649
>> > [2] http://review.coreboot.org/cgit/board-status.git/tree/asrock/e350m1
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: `pcilib: sysfs_read_vpd: read failed: Input/output error` on ASRock E350M1
2016-05-18 1:52 ` Myron Stowe
@ 2016-05-21 20:18 ` Paul Menzel
2016-06-11 12:12 ` Paul Menzel
0 siblings, 1 reply; 8+ messages in thread
From: Paul Menzel @ 2016-05-21 20:18 UTC (permalink / raw)
To: Myron Stowe; +Cc: Bjorn Helgaas, linux-pci
[-- Attachment #1.1: Type: text/plain, Size: 8804 bytes --]
Dear Myron,
Am Dienstag, den 17.05.2016, 19:52 -0600 schrieb Myron Stowe:
> On Tue, May 17, 2016 at 3:21 PM, Paul Menzel wrote:
> > Am Montag, den 16.05.2016, 19:42 -0600 schrieb Myron Stowe:
> > > On Mon, May 16, 2016 at 2:37 PM, Paul Menzel wrote:
> >
> > > > Am Montag, den 16.05.2016, 12:02 -0600 schrieb Myron Stowe:
> > > > >
> > > > > On Sun, May 15, 2016 at 10:56 AM, Paul Menzel wrote:
> > > > […]
> > > > > >
> > > > > > Is that related to [1]?
> > > > > There have been a number of recent kernel commits to work-around know
> > > > > buggy devices -
> > > > > v4.6-rc5
> > > > > 67e6587 cxgb4: Set VPD size so we can read both VPD structures
> > > > > cb92148 PCI: Add pci_set_vpd_size() to set VPD size
> > > > > v4.6 -
> > > > > 7c20078 PCI: Prevent VPD access for buggy devices
> > > > > c521b01 PCI: Sleep rather than busy-wait for VPD access completion
> > > > > 408641e PCI: Fold struct pci_vpd_pci22 into struct pci_vpd
> > > > > f1cd93f PCI: Rename VPD symbols to remove unnecessary "pci22"
> > > > > da00684 PCI: Remove struct pci_vpd_ops.release function pointer
> > > > > 6437907 PCI: Move pci_vpd_release() from header file to pci/access.c
> > > > > fc0a407 PCI: Move pci_read_vpd() and pci_write_vpd() close to other code
> > > > > 104daa7 PCI: Determine actual VPD size on first access
> > > > > c556388 PCI: Use bitfield instead of bool for struct pci_vpd_pci22.busy
> > > > > f52e562 PCI: Allow access to VPD attributes with size 0
> > > > > 9eb45d5 PCI: Update VPD definitions
> > > > > v4.3 -
> > > > > da2d03e PCI: Use function 0 VPD only for identical functions
> > > > > 9d92407 PCI: Fix devfn for VPD access through function 0
> > > > > 7aa6ca4 PCI: Add VPD function 0 quirk for Intel Ethernet devices
> > > > > 932c435 PCI: Add dev_flags bit to access VPD through function 0
> > > > >
> > > > > What were you getting/seeing before?
> > > > The error wasn’t shown. Sorry if that is not a helpful answer. If I
> > > > provide more information, please tell me how I can get them.
> > > I expect that prior to the kernel updates you were seeing:
> > >
> > > lspci -s 3:0 -vv
> > > ...
> > > Capabilities: [d0] Vital Product Data
> > > Unknown small resource type 00, will not decode more.
> > > ...
> >
> > From logs stored in coreboot’s board status repository [2].
> >
> > ```
> > $ more asrock/e350m1/4.3-817-g477a0d6/2016-04-22T18_41_34Z/lspci-vvxxx.txt
> > […]
> > Capabilities: [d0] Vital Product Data
> > No end tag found
> > […]
> > ```
>
> The above - "No end tag found" - is from 'lspci' reading the VPD area
> and parsing it looking for an small resource data type "End Tag"
> (0x0f) and never finding one. Thus it seems like the VPD area is
> malformed at best.
>
> > > and with 'xxd', looking at the VPD area you likely would have seen:
> > >
> > > # xxd /sys/bus/pci/devices/0000\:03\:00.0/vpd
> > > 0000000: 0000 0000 0000 0000 0000 0000 0000 0000 ................
> > > 0000010: 0000 0000 0000 0000 0000 0000 0000 0000 ................
> > > 0000020: 0000 0000 0000 0000 0000 0000 0000 0000 ................
> > > ...
> > >
> > > and nothing in the 'dmesg' logs.
> >
> > ```
> > $ more asrock/e350m1/4.3-817-g477a0d6/2016-04-22T18_41_34Z/lspci-vvxxx.txt
> > […]
> > c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> > d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> > e0: 10 00 01 01 01 12 63 80 00 00 00 00 00 00 00 00
> > f0: 00 00 00 00 00 80 80 00 00 00 00 00 00 00 00 00
> > […]
> > ```
>
> Careful here, the above is _not_ the VPD area. The above is the
> device's standard PCI (type 0) configuration header registers [I'm
> thinking you mistook the 0xd0 from "Capabilities: [d0] Vital Product
> Data" and thought that was the offset for the VPD area - it is not.
> To get to the VPD area one has to manipulate a couple of VPD registers
> which is basically obtaining the VPD bytes from within the device
> itself (i.e. from within the device's firmware)].
>
> To get the VPD area you will need to run a kernel prior to the commits
> I pointed out and then use 'xxd' as shown above to gain insight into
> what, if anything, is really there.
>
> > There is nothing in the Linux 3.16 messages.
> >
> > > With the recent kernel updates you see the new output from the kernel
> > > and 'lspci -vv' that started this thread. I expect that you also get
> > > something close to the following from 'xxd':
> > >
> > > # xxd /sys/bus/pci/devices/0000\:03\:00.0/vpd
> > > xxd: Input/output error
> >
> > Correct.
> >
> > > and also see the following in the 'dmesg' logs.
> > >
> > > # dmesg | grep VPD
> > > r8169 0000:03:00.0: invalid short VPD tag 00 at offset 1
> >
> > Indeed similar:
> >
> > ```
> > $ dmesg | grep VPD
> > [15841.258561] r8169 0000:03:00.0: invalid large VPD tag 7f at offset 0
> > ```
>
> Humm, the above is interesting to me in that it implies that the VPD
> area is not necessarily all 0's as I was expecting. A "Large VPD tag"
> is denoted by the most significant bit of the first byte being set.
> However, the value denoted - 0x7f - does not have the MSB set so now
> I'm a bit confused (perhaps the MSB is stripped off - I'll need to
> look at the related code). Either way, its looking like perhaps the
> VPD area is not all 0's so I'd really be interested in knowing what is
> there.
>
> Ok, looking at the code - ./drivers/pci/access.c::pci_vpd_size() - the
> tag value output - 7f - had its MSB stripped off via
> 'pci_vpd_lrdt_tag()'. So what must have been read for the first byte
> was 0xff.
>
> > > The new kernel behavior is correct in its complaint as the device is
> > > advertising that it has VPD via a 'capability' yet its VPD data area
> > > is likely all 0's. This is a device error - specifically an error
> > > with the device's firmware: either it should _not_ advertise via the
> > > 'capability' that it has VPD or, it s VPD area needs to conform to the
> > > VPD data format as expressed in the "PCI Local Bus Specification, Rev.
> > > 3.0" appendix I - "Vital Product Data".
> > >
> > > With the new kernel behavior, effectively circumventing reading of an
> > > invalid VPD area, you can't get to the data via "# xxd" (as shown
> > > above). You could run a kernel prior to the changes and run the "xxd"
> > > command and likely see that the VPD area is all 0's. I would be
> > > interested in confirming such if you could do so please.
> >
> > Please see the paste above. Please tell me if I missed something.
>
> I have to admit I'm a bit surprised at this point (that the VPD area
> is not all 0's as I was expecting). The only way we'll know is to
> obtain the VPD area - if you can get that via 'xxd' it would be
> interesting to see what is there exactly.
Checking with xxd under Linux 3.19, the VPD area is all 0xff. Please
find the file obtained by the command below attached.
```
$ sudo cp /sys/devices/pci0000:00/0000:00:15.1/0000:03:00.0/vpd /tmp/20160521--realtek-vpd.bin
$ ls -l /tmp/20160521--realtek-vpd.bin
-rw------- 1 root root 32768 Mai 21 20:49 /tmp/20160521--realtek-vpd.bin
```
> > So what to do about this? Contact Realtek? Add a workaround?
>
> The VPD area is almost certainly malformed (or doesn't exist at all).
> As a colleague of mine noted today, LSI devices seem to be especially
> negligent in this manner (see commit 7c20078 ("PCI: Prevent VPD access
> for buggy devices")). Assuming the VPD area of this device is at best
> invalid then the kernel is correct in its current behavior - not much
> more it can do. While it would be good for the device's firmware to
> be upgraded to either not advertise it has VPD or to put in valid VPD,
> I very much doubt you'd get any traction there. You could try adding
> this device's signature (device and vendor id) to the 7c20078 quirk
> and see if there is any subtle difference. If there was, it'd be very
> subtle at best.
>
> All that aside, you are just questioning the error output - correct
> (i.e. you are not expecting, nor needing, valid VPD content for some
> reason and questioning that I assume)?
Correct. I was just surprised by the error by lspci, as I hadn’t seen
it before.
Thanks,
Paul
> > > > > > [1] https://lkml.org/lkml/2016/4/15/649
> > > > [2] http://review.coreboot.org/cgit/board-status.git/tree/asrock/e350m1
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[-- Type: application/octet-stream, Size: 32768 bytes --]
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: `pcilib: sysfs_read_vpd: read failed: Input/output error` on ASRock E350M1
2016-05-21 20:18 ` Paul Menzel
@ 2016-06-11 12:12 ` Paul Menzel
0 siblings, 0 replies; 8+ messages in thread
From: Paul Menzel @ 2016-06-11 12:12 UTC (permalink / raw)
To: Myron Stowe; +Cc: Bjorn Helgaas, linux-pci
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Dear Myron, dear Linux folks,
Am Samstag, den 21.05.2016, 22:18 +0200 schrieb Paul Menzel:
> Am Dienstag, den 17.05.2016, 19:52 -0600 schrieb Myron Stowe:
> > On Tue, May 17, 2016 at 3:21 PM, Paul Menzel wrote:
>
> > > Am Montag, den 16.05.2016, 19:42 -0600 schrieb Myron Stowe:
> > > > On Mon, May 16, 2016 at 2:37 PM, Paul Menzel wrote:
> > >
> > > > > Am Montag, den 16.05.2016, 12:02 -0600 schrieb Myron Stowe:
> > > > > >
> > > > > > On Sun, May 15, 2016 at 10:56 AM, Paul Menzel wrote:
> > > > > […]
> > > > > > >
> > > > > > > Is that related to [1]?
> > > > > > There have been a number of recent kernel commits to work-around know
> > > > > > buggy devices -
> > > > > > v4.6-rc5
> > > > > > 67e6587 cxgb4: Set VPD size so we can read both VPD structures
> > > > > > cb92148 PCI: Add pci_set_vpd_size() to set VPD size
> > > > > > v4.6 -
> > > > > > 7c20078 PCI: Prevent VPD access for buggy devices
> > > > > > c521b01 PCI: Sleep rather than busy-wait for VPD access completion
> > > > > > 408641e PCI: Fold struct pci_vpd_pci22 into struct pci_vpd
> > > > > > f1cd93f PCI: Rename VPD symbols to remove unnecessary "pci22"
> > > > > > da00684 PCI: Remove struct pci_vpd_ops.release function pointer
> > > > > > 6437907 PCI: Move pci_vpd_release() from header file to pci/access.c
> > > > > > fc0a407 PCI: Move pci_read_vpd() and pci_write_vpd() close to other code
> > > > > > 104daa7 PCI: Determine actual VPD size on first access
> > > > > > c556388 PCI: Use bitfield instead of bool for struct pci_vpd_pci22.busy
> > > > > > f52e562 PCI: Allow access to VPD attributes with size 0
> > > > > > 9eb45d5 PCI: Update VPD definitions
> > > > > > v4.3 -
> > > > > > da2d03e PCI: Use function 0 VPD only for identical functions
> > > > > > 9d92407 PCI: Fix devfn for VPD access through function 0
> > > > > > 7aa6ca4 PCI: Add VPD function 0 quirk for Intel Ethernet devices
> > > > > > 932c435 PCI: Add dev_flags bit to access VPD through function 0
> > > > > >
> > > > > > What were you getting/seeing before?
> > > > > The error wasn’t shown. Sorry if that is not a helpful answer. If I
> > > > > provide more information, please tell me how I can get them.
> > > > I expect that prior to the kernel updates you were seeing:
> > > >
> > > > lspci -s 3:0 -vv
> > > > ...
> > > > Capabilities: [d0] Vital Product Data
> > > > Unknown small resource type 00, will not decode more.
> > > > ...
> > >
> > > From logs stored in coreboot’s board status repository [2].
> > >
> > > ```
> > > $ more asrock/e350m1/4.3-817-g477a0d6/2016-04-22T18_41_34Z/lspci-vvxxx.txt
> > > […]
> > > Capabilities: [d0] Vital Product Data
> > > No end tag found
> > > […]
> > > ```
> >
> > The above - "No end tag found" - is from 'lspci' reading the VPD area
> > and parsing it looking for an small resource data type "End Tag"
> > (0x0f) and never finding one. Thus it seems like the VPD area is
> > malformed at best.
> >
> > > > and with 'xxd', looking at the VPD area you likely would have seen:
> > > >
> > > > # xxd /sys/bus/pci/devices/0000\:03\:00.0/vpd
> > > > 0000000: 0000 0000 0000 0000 0000 0000 0000 0000 ................
> > > > 0000010: 0000 0000 0000 0000 0000 0000 0000 0000 ................
> > > > 0000020: 0000 0000 0000 0000 0000 0000 0000 0000 ................
> > > > ...
> > > >
> > > > and nothing in the 'dmesg' logs.
> > >
> > > ```
> > > $ more asrock/e350m1/4.3-817-g477a0d6/2016-04-22T18_41_34Z/lspci-vvxxx.txt
> > > […]
> > > c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> > > d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> > > e0: 10 00 01 01 01 12 63 80 00 00 00 00 00 00 00 00
> > > f0: 00 00 00 00 00 80 80 00 00 00 00 00 00 00 00 00
> > > […]
> > > ```
> >
> > Careful here, the above is _not_ the VPD area. The above is the
> > device's standard PCI (type 0) configuration header registers [I'm
> > thinking you mistook the 0xd0 from "Capabilities: [d0] Vital Product
> > Data" and thought that was the offset for the VPD area - it is not.
> > To get to the VPD area one has to manipulate a couple of VPD registers
> > which is basically obtaining the VPD bytes from within the device
> > itself (i.e. from within the device's firmware)].
> >
> > To get the VPD area you will need to run a kernel prior to the commits
> > I pointed out and then use 'xxd' as shown above to gain insight into
> > what, if anything, is really there.
> >
> > > There is nothing in the Linux 3.16 messages.
> > >
> > > > With the recent kernel updates you see the new output from the kernel
> > > > and 'lspci -vv' that started this thread. I expect that you also get
> > > > something close to the following from 'xxd':
> > > >
> > > > # xxd /sys/bus/pci/devices/0000\:03\:00.0/vpd
> > > > xxd: Input/output error
> > >
> > > Correct.
> > >
> > > > and also see the following in the 'dmesg' logs.
> > > >
> > > > # dmesg | grep VPD
> > > > r8169 0000:03:00.0: invalid short VPD tag 00 at offset 1
> > >
> > > Indeed similar:
> > >
> > > ```
> > > $ dmesg | grep VPD
> > > [15841.258561] r8169 0000:03:00.0: invalid large VPD tag 7f at offset 0
> > > ```
> >
> > Humm, the above is interesting to me in that it implies that the VPD
> > area is not necessarily all 0's as I was expecting. A "Large VPD tag"
> > is denoted by the most significant bit of the first byte being set.
> > However, the value denoted - 0x7f - does not have the MSB set so now
> > I'm a bit confused (perhaps the MSB is stripped off - I'll need to
> > look at the related code). Either way, its looking like perhaps the
> > VPD area is not all 0's so I'd really be interested in knowing what is
> > there.
> >
> > Ok, looking at the code - ./drivers/pci/access.c::pci_vpd_size() - the
> > tag value output - 7f - had its MSB stripped off via
> > 'pci_vpd_lrdt_tag()'. So what must have been read for the first byte
> > was 0xff.
> >
> > > > The new kernel behavior is correct in its complaint as the device is
> > > > advertising that it has VPD via a 'capability' yet its VPD data area
> > > > is likely all 0's. This is a device error - specifically an error
> > > > with the device's firmware: either it should _not_ advertise via the
> > > > 'capability' that it has VPD or, it s VPD area needs to conform to the
> > > > VPD data format as expressed in the "PCI Local Bus Specification, Rev.
> > > > 3.0" appendix I - "Vital Product Data".
> > > >
> > > > With the new kernel behavior, effectively circumventing reading of an
> > > > invalid VPD area, you can't get to the data via "# xxd" (as shown
> > > > above). You could run a kernel prior to the changes and run the "xxd"
> > > > command and likely see that the VPD area is all 0's. I would be
> > > > interested in confirming such if you could do so please.
> > >
> > > Please see the paste above. Please tell me if I missed something.
> >
> > I have to admit I'm a bit surprised at this point (that the VPD area
> > is not all 0's as I was expecting). The only way we'll know is to
> > obtain the VPD area - if you can get that via 'xxd' it would be
> > interesting to see what is there exactly.
>
> Checking with xxd under Linux 3.19, the VPD area is all 0xff. Please
> find the file obtained by the command below attached.
>
> ```
> $ sudo cp /sys/devices/pci0000:00/0000:00:15.1/0000:03:00.0/vpd /tmp/20160521--realtek-vpd.bin
> $ ls -l /tmp/20160521--realtek-vpd.bin
> -rw------- 1 root root 32768 Mai 21 20:49 /tmp/20160521--realtek-vpd.bin
> ```
>
> > > So what to do about this? Contact Realtek? Add a workaround?
> >
> > The VPD area is almost certainly malformed (or doesn't exist at all).
> > As a colleague of mine noted today, LSI devices seem to be especially
> > negligent in this manner (see commit 7c20078 ("PCI: Prevent VPD access
> > for buggy devices")). Assuming the VPD area of this device is at best
> > invalid then the kernel is correct in its current behavior - not much
> > more it can do. While it would be good for the device's firmware to
> > be upgraded to either not advertise it has VPD or to put in valid VPD,
> > I very much doubt you'd get any traction there. You could try adding
> > this device's signature (device and vendor id) to the 7c20078 quirk
> > and see if there is any subtle difference. If there was, it'd be very
> > subtle at best.
> >
> > All that aside, you are just questioning the error output - correct
> > (i.e. you are not expecting, nor needing, valid VPD content for some
> > reason and questioning that I assume)?
>
> Correct. I was just surprised by the error by lspci, as I hadn’t seen
> it before.
Were you able to look at the VPD data I sent? If it’s not following the
standard, could you please confirm that, and tell me, what I could
report to the manufacturer?
Thanks,
Paul
> > > > > > > [1] https://lkml.org/lkml/2016/4/15/649
> > > > > [2] http://review.coreboot.org/cgit/board-status.git/tree/asrock/e350m1
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^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2016-06-11 12:12 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-05-15 16:56 `pcilib: sysfs_read_vpd: read failed: Input/output error` on ASRock E350M1 Paul Menzel
2016-05-16 18:02 ` Myron Stowe
2016-05-16 20:37 ` Paul Menzel
2016-05-17 1:42 ` Myron Stowe
2016-05-17 21:21 ` Paul Menzel
2016-05-18 1:52 ` Myron Stowe
2016-05-21 20:18 ` Paul Menzel
2016-06-11 12:12 ` Paul Menzel
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