[PATCH pci/host-iproc] PCI: iproc: Allow more than slot 0 on PAXC
Ray Jui
ray.jui at broadcom.com
Mon Dec 19 14:01:59 PST 2016
On 12/19/2016 1:30 PM, Andy Gospodarek wrote:
> On Mon, Dec 19, 2016 at 10:54:15AM -0800, Ray Jui wrote:
>>
>>
>> On 12/8/2016 1:30 PM, Andy Gospodarek wrote:
>>> The iproc host driver limits the number of slots that are available on
>>> PAXC devices. Enforcing this limit prevents VFs from being created
>>> beyond the first port. After this change it is possible to create VFs
>>> associated with all four devices.
>>>
>>> The first four devices below are the PFs and the next four are the newly
>>> created VFs:
>>>
>>> 0008:01:00.0 Ethernet controller: Broadcom Limited Device 16cd
>>> 0008:01:00.1 Ethernet controller: Broadcom Limited Device 16cd
>>> 0008:01:00.2 Ethernet controller: Broadcom Limited Device 16cd
>>> 0008:01:00.3 Ethernet controller: Broadcom Limited Device 16cd
>>> 0008:01:00.4 Ethernet controller: Broadcom Limited BCM57304 NetXtreme-C Ethernet Virtual Function
>>> 0008:01:01.0 Ethernet controller: Broadcom Limited BCM57304 NetXtreme-C Ethernet Virtual Function
>>> 0008:01:01.4 Ethernet controller: Broadcom Limited BCM57304 NetXtreme-C Ethernet Virtual Function
>>> 0008:01:02.0 Ethernet controller: Broadcom Limited BCM57304 NetXtreme-C Ethernet Virtual Function
>>>
>>> Based on the git history around 923c6bb1f641 ("PCI: iproc: Allow multiple
>>> devices except on PAXC") and 943ebae781f5 ("PCI: iproc: Add PAXC interface
>>> support") I expect there may be an unmentioned or unknown-to-me reason why this
>>> code exists. I certainly cannot create and use VFs without some kind of change
>>> around this space, so I would like to see the current limitation simply removed.
>>>
>>> Fixes: 923c6bb1f641 ("PCI: iproc: Allow multiple devices except on PAXC")
>>
>>> Signed-off-by: Andy Gospodarek <gospo at broadcom.com>
>>> ---
>>> drivers/pci/host/pcie-iproc.c | 8 --------
>>> 1 file changed, 8 deletions(-)
>>>
>>> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
>>> index 3ebc025..9311826 100644
>>> --- a/drivers/pci/host/pcie-iproc.c
>>> +++ b/drivers/pci/host/pcie-iproc.c
>>> @@ -477,14 +477,6 @@ static void __iomem *iproc_pcie_map_cfg_bus(struct pci_bus *bus,
>>> return (pcie->base + offset);
>>> }
>>>
>>> - /*
>>> - * PAXC is connected to an internally emulated EP within the SoC. It
>>> - * allows only one device.
>>> - */
>>> - if (pcie->ep_is_internal)
>>> - if (slot > 0)
>>> - return NULL;
>>> -
>>> /* EP device access */
>>> val = (busno << CFG_ADDR_BUS_NUM_SHIFT) |
>>> (slot << CFG_ADDR_DEV_NUM_SHIFT) |
>>>
>>
>> With this change, standard v4.9 kernel would crash on a NS2 SVK with the
>> log shown below. This is inline with my previous observation and
>> therefore slot number has been limited to only zero for the PAXC
>> interface. Does it require more than just this change in order for the
>> kernel to boot to complete?
>>
>> [ 2.190515] OF: PCI: host bridge /pcie at 60c00000 ranges:
>> [ 2.196400] OF: PCI: MEM 0x60000000..0x60bfffff -> 0x00000000
>> [ 2.203135] iproc-pcie 60c00000.pcie: PCI host bridge to bus 0008:00
>> [ 2.210289] pci_bus 0008:00: root bus resource [bus 00-01]
>> [ 2.216349] pci_bus 0008:00: root bus resource [mem
>> 0x60000000-0x60bfffff] (bus address [0x00000000-0x00bfffff])
>> [ 2.227769] iproc-pcie 60c00000.pcie: not using iProc MSI
>> [ 2.234050] pci 0008:00:00.0: bridge configuration invalid ([bus
>> 00-00]), reconfiguring
>> [ 2.244285] Bad mode in Error handler detected on CPU1, code
>> 0xbf000002 -- SError
>> [ 2.252661] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.9.0+ #24
>> [ 2.259430] Hardware name: Broadcom NS2 SVK (DT)
>> [ 2.264550] task: ffff8000fb488000 task.stack: ffff8000fb490000
>> [ 2.271161] PC is at pci_generic_config_read32+0x74/0xa0
>> [ 2.277043] LR is at pci_generic_config_read32+0x28/0xa0
>> [ 2.283005] pc : [<ffff00000839d984>] lr : [<ffff00000839d938>]
>> pstate: 200000c5
>> [ 2.291225] sp : ffff8000fb4937f0
>> [ 2.294937] x29: ffff8000fb4937f0 x28: ffff8000fadb9000
>> [ 2.300884] x27: ffff8000faf27098 x26: 0000000000000000
>> [ 2.306803] x25: 0000000000000000 x24: ffff8000fadb9400
>> [ 2.312757] x23: 0000000000000040 x22: ffff0000089c55d8
>> [ 2.318730] x21: 0000000000000010 x20: ffff8000fb49391c
>> [ 2.324666] x19: 0000000000000000 x18: 000000000000077f
>> [ 2.330594] x17: ffffffffffffffff x16: ffff000008a49fff
>> [ 2.336539] x15: ffff000008a49fff x14: 0000000000000000
>> [ 2.342502] x13: 0000000000000007 x12: 0000000000000018
>> [ 2.348456] x11: 0101010101010101 x10: 7f7f7f7f7f7f7f7f
>> [ 2.354392] x9 : 0000000000000000 x8 : ffff8000fa80e680
>> [ 2.360355] x7 : 000000000000ffff x6 : ffff8000faf0ca98
>> [ 2.366300] x5 : 0000000000000002 x4 : ffff8000fb49389c
>> [ 2.372290] x3 : 0000000000000004 x2 : 0000000000100001
>> [ 2.378209] x1 : ffff000008a49000 x0 : 0000000000000000
>> [ 2.384145]
>> [ 2.385807] Internal error: Oops - bad mode: 0 [#1] PREEMPT SMP
>> [ 2.392351] Modules linked in:
>> [ 2.395770] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.9.0+ #24
>> [ 2.402529] Hardware name: Broadcom NS2 SVK (DT)
>> [ 2.407693] task: ffff8000fb488000 task.stack: ffff8000fb490000
>> [ 2.414301] PC is at pci_generic_config_read32+0x74/0xa0
>> [ 2.420299] LR is at pci_generic_config_read32+0x28/0xa0
>> [ 2.426279] pc : [<ffff00000839d984>] lr : [<ffff00000839d938>]
>> pstate: 200000c5
>> [ 2.434552] sp : ffff8000fb4937f0
>> [ 2.438246] x29: ffff8000fb4937f0 x28: ffff8000fadb9000
>> [ 2.444209] x27: ffff8000faf27098 x26: 0000000000000000
>> [ 2.450137] x25: 0000000000000000 x24: ffff8000fadb9400
>> [ 2.456091] x23: 0000000000000040 x22: ffff0000089c55d8
>> [ 2.462037] x21: 0000000000000010 x20: ffff8000fb49391c
>> [ 2.467947] x19: 0000000000000000 x18: 000000000000077f
>> [ 2.473945] x17: ffffffffffffffff x16: ffff000008a49fff
>> [ 2.479881] x15: ffff000008a49fff x14: 0000000000000000
>> [ 2.485826] x13: 0000000000000007 x12: 0000000000000018
>> [ 2.491798] x11: 0101010101010101 x10: 7f7f7f7f7f7f7f7f
>> [ 2.497752] x9 : 0000000000000000 x8 : ffff8000fa80e680
>> [ 2.503689] x7 : 000000000000ffff x6 : ffff8000faf0ca98
>> [ 2.509643] x5 : 0000000000000002 x4 : ffff8000fb49389c
>> [ 2.515561] x3 : 0000000000000004 x2 : 0000000000100001
>> [ 2.521453] x1 : ffff000008a49000 x0 : 0000000000000000
>> [ 2.527388]
>> [ 2.529058] Process swapper/0 (pid: 1, stack limit = 0xffff8000fb490020)
>> [ 2.536607] Stack: (0xffff8000fb4937f0 to 0xffff8000fb494000)
>> [ 2.543044] 37e0: ffff8000fb493820
>> ffff0000083b65cc
>> [ 2.551830] 3800: ffff8000fadb9400 ffff00000867606c 0000000000000004
>> ffff8000fb49389c
>> [ 2.560481] 3820: ffff8000fb493840 ffff00000839dcc8 ffff8000fadb9400
>> ffff00000839dce0
>> [ 2.569158] 3840: ffff8000fb4938a0 ffff00000839fcb8 0000000000000000
>> ffff8000fb49391c
>> [ 2.577915] 3860: 000000000000ea60 0000000000000001 0000000000000010
>> 0000000000000000
>> [ 2.586718] 3880: ffff8000faef9000 0000000000000000 ffff8000fb4938b0
>> 00000000083a94d8
>> [ 2.595548] 38a0: ffff8000fb4938e0 ffff0000083a1380 0000000000000000
>> ffff8000fadb9400
>> [ 2.604359] 38c0: 0000000000000010 0000000000000001 ffff0000087fb000
>> ffff8000fadb9528
>> [ 2.613180] 38e0: ffff8000fb493920 ffff0000083a1444 ffff8000fadb9400
>> ffff8000fadb9400
>> [ 2.621938] 3900: 0000000000000010 0000000000000004 ffff8000fb493960
>> fffffffffb493960
>> [ 2.630767] 3920: ffff8000fb493960 ffff0000083a237c 0000000000000018
>> ffff8000fadb9400
>> [ 2.639543] 3940: 0000000000000001 0000000000000000 ffff8000fadb9000
>> 0000000000000007
>> [ 2.648355] 3960: ffff8000fb4939b0 ffff0000083a20d8 ffff8000faf27000
>> ffff8000fadb9400
>> [ 2.657166] 3980: 0000000000000001 0000000000000000 0000000000000000
>> 0000000000000001
>> [ 2.665960] 39a0: 0000000000000000 0000000000000018 ffff8000fb493a30
>> ffff0000083a23d8
>> [ 2.674789] 39c0: ffff8000faf27000 ffff8000fadb9000 ffff8000fadb9028
>> 0000000000000000
>> [ 2.683547] 39e0: ffff0000087fb000 ffff8000fadb9128 0000000000000001
>> ffff0000088c0460
>> [ 2.692341] 3a00: ffff0000089a4000 ffff0000088f8b60 ffff8000fb49396c
>> 0000000000000000
>> [ 2.701117] 3a20: 0000000000000000 00ff010000000000 ffff8000fb493a80
>> ffff0000083b731c
>> [ 2.709910] 3a40: ffff8000faf0e218 ffff8000fffe7748 ffff8000fb63f410
>> ffff8000fadb9000
>> [ 2.718695] 3a60: ffff0000086e9000 ffff8000fffe1e00 ffff0000088f8bc0
>> 6c6071652c6c3175
>> [ 2.727489] 3a80: ffff8000fb493bc0 ffff0000083b8774 0000000000000000
>> ffff8000faf0e218
>> [ 2.736291] 3aa0: ffff8000fb63f410 ffff8000fb493c10 ffff8000fffe1e00
>> ffff8000fb63f400
>> [ 2.745058] 3ac0: ffff0000088f8bc0 ffff0000088c0460 ffff0000089a4000
>> ffff0000088f8b60
>> [ 2.753816] 3ae0: ffff8000fb493b20 ffff00000858b7b0 ffff8000fb493c08
>> ffff000008855f08
>> [ 2.762583] 3b00: ffff0000089b6000 ffff8000fb493c10 ffff8000fffe1e00
>> 0000000060000000
>> [ 2.771376] 3b20: ffff8000fb493bc0 ffff0000083b8744 0000000000000000
>> ffff8000faf0e218
>> [ 2.780125] 3b40: ffff8000fb63f410 ffff8000fb493c10 ffff8000fffe1e00
>> ffff8000fb63f400
>> [ 2.788937] 3b60: ffff8000fffe1e00 0000000000000000 ffff0000004d454d
>> 0000000200000007
>> [ 2.797731] 3b80: ffff7dfffe8009dc ffff7dfffe8009dc 0000000200000007
>> ffff000000000083
>> [ 2.806533] 3ba0: 0000000000000000 0000000060000000 0000000000c00000
>> 0000000000000200
>> [ 2.815372] 3bc0: ffff8000fb493c60 ffff000008414ef8 ffff000008962258
>> ffff8000fb63f410
>> [ 2.824121] 3be0: 0000000000000000 ffff000008962280 0000000000000000
>> ffff0000089a4000
>> [ 2.832950] 3c00: ffff8000fb493c40 ffffffffffffffff ffff8000fb493c10
>> ffff8000fb493c10
>> [ 2.841717] 3c20: 0000000060c00000 0000000060c00fff ffff8000fffe1ea8
>> 0000000000000200
>> [ 2.850529] 3c40: 0000000000000000 0000000000000000 0000000000000000
>> 0000000000000000
>> [ 2.859358] 3c60: ffff8000fb493c80 ffff000008413688 ffff8000fb63f410
>> ffff0000089c8000
>> [ 2.868161] 3c80: ffff8000fb493cc0 ffff0000084137c0 ffff8000fb63f410
>> ffff000008962280
>> [ 2.876919] 3ca0: ffff8000fb63f470 ffff00000896cd30 ffff00000896c000
>> ffff00000841190c
>> [ 2.885677] 3cc0: ffff8000fb493cf0 ffff000008411900 0000000000000000
>> ffff000008962280
>> [ 2.894497] 3ce0: ffff000008413720 ffff8000fb493d40 ffff8000fb493d30
>> ffff000008413124
>> [ 2.903308] 3d00: ffff000008962280 ffff8000faf0e100 0000000000000000
>> ffff00000867606c
>> [ 2.912058] 3d20: ffff8000fb43eca8 ffff8000fb625b68 ffff8000fb493d40
>> ffff000008412d84
>> [ 2.920815] 3d40: ffff8000fb493d80 ffff000008413eb4 ffff000008962280
>> ffff0000088e1438
>> [ 2.929591] 3d60: 0000000000000000 ffff0000088f8b30 ffff0000088aba00
>> ffff0000089c5000
>> [ 2.938358] 3d80: ffff8000fb493db0 ffff000008414eb8 ffff8000fb490000
>> ffff0000088e1438
>> [ 2.947134] 3da0: 0000000000000000 0000000000000000 ffff8000fb493dc0
>> ffff0000088e1450
>> [ 2.955936] 3dc0: ffff8000fb493dd0 ffff000008083144 ffff8000fb493e40
>> ffff0000088c0c98
>> [ 2.964658] 3de0: ffff000008907240 0000000000000006 00000000000000e7
>> ffff0000088f8b30
>> [ 2.973506] 3e00: ffff8000fb493e00 ffff0000087f42c8 ffff8000fb493e20
>> ffff0000087f3ae8
>> [ 2.982326] 3e20: 0000000600000006 0000000000000000 0000000000000000
>> ffff0000088aba00
>> [ 2.991129] 3e40: ffff8000fb493ea0 ffff000008678154 ffff000008678144
>> 0000000000000000
>> [ 2.999922] 3e60: 0000000000000000 0000000000000000 0000000000000000
>> 0000000000000000
>> [ 3.008671] 3e80: 0000000000000000 0000000000000000 0000000000000000
>> 0000000000000000
>> [ 3.017500] 3ea0: 0000000000000000 ffff000008082e80 ffff000008678144
>> 0000000000000000
>> [ 3.026294] 3ec0: 0000000000000000 0000000000000000 0000000000000000
>> 0000000000000000
>> [ 3.035043] 3ee0: 0000000000000000 0000000000000000 0000000000000000
>> 0000000000000000
>> [ 3.043818] 3f00: 0000000000000000 0000000000000000 0000000000000000
>> 0000000000000000
>> [ 3.052639] 3f20: 0000000000000000 0000000000000000 0000000000000000
>> 0000000000000000
>> [ 3.061432] 3f40: 0000000000000000 0000000000000000 0000000000000000
>> 0000000000000000
>> [ 3.070207] 3f60: 0000000000000000 0000000000000000 0000000000000000
>> 0000000000000000
>> [ 3.079036] 3f80: 0000000000000000 0000000000000000 0000000000000000
>> 0000000000000000
>> [ 3.087820] 3fa0: 0000000000000000 0000000000000000 0000000000000000
>> 0000000000000000
>> [ 3.096623] 3fc0: 0000000000000000 0000000000000005 0000000000000000
>> 0000000000000000
>> [ 3.105398] 3fe0: 0000000000000000 0000000000000000 000000017b493ff0
>> 000000017b493ff8
>> [ 3.114173] Call trace:
>> [ 3.116920] [<ffff00000839d984>] pci_generic_config_read32+0x74/0xa0
>> [ 3.124039] [<ffff0000083b65cc>] iproc_pcie_config_read32+0x2c/0xe0
>> [ 3.131041] [<ffff00000839dcc8>] pci_bus_read_config_dword+0x80/0xb0
>> [ 3.138143] [<ffff00000839fcb8>] pci_bus_read_dev_vendor_id+0x30/0x104
>> [ 3.145459] [<ffff0000083a1380>] pci_scan_single_device+0x50/0xc4
>> [ 3.152345] [<ffff0000083a1444>] pci_scan_slot+0x50/0xf0
>> [ 3.158334] [<ffff0000083a237c>] pci_scan_child_bus+0x50/0x164
>> [ 3.164798] [<ffff0000083a20d8>] pci_scan_bridge+0x2c0/0x514
>> [ 3.171154] [<ffff0000083a23d8>] pci_scan_child_bus+0xac/0x164
>> [ 3.177690] [<ffff0000083b731c>] iproc_pcie_setup+0x71c/0xc78
>> [ 3.184172] [<ffff0000083b8774>] iproc_pcie_pltfm_probe+0x170/0x260
>> [ 3.191176] [<ffff000008414ef8>] platform_drv_probe+0x38/0x7c
>> [ 3.197640] [<ffff000008413688>] really_probe+0x1b0/0x248
>> [ 3.203701] [<ffff0000084137c0>] __driver_attach+0xa0/0xb0
>> [ 3.209878] [<ffff000008411900>] bus_for_each_dev+0x58/0x98
>> [ 3.216110] [<ffff000008413124>] driver_attach+0x20/0x28
>> [ 3.222063] [<ffff000008412d84>] bus_add_driver+0x1c8/0x22c
>> [ 3.228285] [<ffff000008413eb4>] driver_register+0x68/0x108
>> [ 3.234517] [<ffff000008414eb8>] __platform_driver_register+0x4c/0x54
>> [ 3.241772] [<ffff0000088e1450>] iproc_pcie_pltfm_driver_init+0x18/0x20
>> [ 3.249224] [<ffff000008083144>] do_one_initcall+0x38/0x128
>> [ 3.255466] [<ffff0000088c0c98>] kernel_init_freeable+0x14c/0x1ec
>> [ 3.262344] [<ffff000008678154>] kernel_init+0x10/0xfc
>> [ 3.268118] [<ffff000008082e80>] ret_from_fork+0x10/0x50
>> [ 3.274108] Code: 52800000 f9400bf3 a8c37bfd d65f03c0 (b9000080)
>> [ 3.280984] ---[ end trace d90bb74924ac9e8e ]---
>> [ 3.286202] note: swapper/0[1] exited with preempt_count 1
>> [ 3.292340] Kernel panic - not syncing: Attempted to kill init!
>> exitcode=0x0000000b
>> [ 3.292340]
>>
>
> I originally tested this patch with the following DT change to enable
> that PCI slot on the host-iproc branch (uname reports it as 4.9.0-rc1+).
> I also just tested it again to be sure and I do not see the same crash
> you see. I'll test Linus' tree and see if I can reproduce what you are
> seeing. We can also share configs offline if needed.
>
Does this require a certain version of Chimp firmware to run on Nitro
for it to work properly?
Thanks,
Ray
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