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Date: Mon, 16 Apr 2012 16:25:14 -0700 From: Greg K H <gregkh@...uxfoundation.org> To: Mauro Carvalho Chehab <mchehab@...hat.com> Cc: Linux Edac Mailing List <linux-edac@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Doug Thompson <norsk5@...oo.com> Subject: Re: [EDAC ABI v13 17/25] edac: Create a per-Memory Controller bus On Mon, Apr 16, 2012 at 05:38:41PM -0300, Mauro Carvalho Chehab wrote: > I'm getting this bug on machines with more than one memory controller: > > [ 819.094946] EDAC DEBUG: find_mci_by_dev: find_mci_by_dev() > [ 819.094948] EDAC DEBUG: edac_create_sysfs_mci_device: edac_create_sysfs_mci_device() idx=1 > [ 819.094952] EDAC DEBUG: edac_create_sysfs_mci_device: edac_create_sysfs_mci_device(): creating device mc1 > [ 819.094967] EDAC DEBUG: edac_create_sysfs_mci_device: edac_create_sysfs_mci_device creating dimm0, located at channel 0 slot 0 > [ 819.094984] ------------[ cut here ]------------ > [ 819.100142] WARNING: at fs/sysfs/dir.c:481 sysfs_add_one+0xc1/0xf0() > [ 819.107282] Hardware name: S2600CP > [ 819.111078] sysfs: cannot create duplicate filename '/bus/edac/devices/dimm0' > [ 819.119062] Modules linked in: sb_edac(+) edac_core ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle iptable_filter ip_tables bridge stp llc sunrpc binfmt_misc dm_mirror dm_region_hash dm_log vhost_net macvtap macvlan tun kvm microcode pcspkr iTCO_wdt iTCO_vendor_support igb i2c_i801 i2c_core sg ioatdma dca sr_mod cdrom sd_mod crc_t10dif ahci libahci isci libsas libata scsi_transport_sas scsi_mod wmi dm_mod [last unloaded: scsi_wait_scan] > [ 819.175748] Pid: 10902, comm: modprobe Not tainted 3.3.0-0.11.el7.v12.2.x86_64 #1 > [ 819.184113] Call Trace: > [ 819.186868] [<ffffffff8105adaf>] warn_slowpath_common+0x7f/0xc0 > [ 819.193573] [<ffffffff8105aea6>] warn_slowpath_fmt+0x46/0x50 > [ 819.200000] [<ffffffff811f53d1>] sysfs_add_one+0xc1/0xf0 > [ 819.206025] [<ffffffff811f5cf5>] sysfs_do_create_link+0x135/0x220 > [ 819.212944] [<ffffffff811f7023>] ? sysfs_create_group+0x13/0x20 > [ 819.219656] [<ffffffff811f5df3>] sysfs_create_link+0x13/0x20 > [ 819.226109] [<ffffffff813b04f6>] bus_add_device+0xe6/0x1b0 > [ 819.232350] [<ffffffff813ae7cb>] device_add+0x2db/0x460 > [ 819.238300] [<ffffffffa0325634>] edac_create_dimm_object+0x84/0xf0 [edac_core] > [ 819.246460] [<ffffffffa0325e18>] edac_create_sysfs_mci_device+0xe8/0x290 [edac_core] > [ 819.255215] [<ffffffffa0322e2a>] edac_mc_add_mc+0x5a/0x2c0 [edac_core] > [ 819.262611] [<ffffffffa03412df>] sbridge_register_mci+0x1bc/0x279 [sb_edac] > [ 819.270493] [<ffffffffa03417a3>] sbridge_probe+0xef/0x175 [sb_edac] > [ 819.277630] [<ffffffff813ba4e8>] ? pm_runtime_enable+0x58/0x90 > [ 819.284268] [<ffffffff812f430c>] local_pci_probe+0x5c/0xd0 > [ 819.290508] [<ffffffff812f5ba1>] __pci_device_probe+0xf1/0x100 > [ 819.297117] [<ffffffff812f5bea>] pci_device_probe+0x3a/0x60 > [ 819.303457] [<ffffffff813b1003>] really_probe+0x73/0x270 > [ 819.309496] [<ffffffff813b138e>] driver_probe_device+0x4e/0xb0 > [ 819.316104] [<ffffffff813b149b>] __driver_attach+0xab/0xb0 > [ 819.322337] [<ffffffff813b13f0>] ? driver_probe_device+0xb0/0xb0 > [ 819.329151] [<ffffffff813af5d6>] bus_for_each_dev+0x56/0x90 > [ 819.335489] [<ffffffff813b0d7e>] driver_attach+0x1e/0x20 > [ 819.341534] [<ffffffff813b0980>] bus_add_driver+0x1b0/0x2a0 > [ 819.347884] [<ffffffffa0347000>] ? 0xffffffffa0346fff > [ 819.353641] [<ffffffff813b19f6>] driver_register+0x76/0x140 > [ 819.359980] [<ffffffff8159f18b>] ? printk+0x51/0x53 > [ 819.365524] [<ffffffffa0347000>] ? 0xffffffffa0346fff > [ 819.371291] [<ffffffff812f5896>] __pci_register_driver+0x56/0xd0 > [ 819.378096] [<ffffffffa0347054>] sbridge_init+0x54/0x1000 [sb_edac] > [ 819.385231] [<ffffffff8100203f>] do_one_initcall+0x3f/0x170 > [ 819.391577] [<ffffffff810bcd2e>] sys_init_module+0xbe/0x230 > [ 819.397926] [<ffffffff815bb529>] system_call_fastpath+0x16/0x1b > [ 819.404633] ---[ end trace 1654fdd39556689f ]--- > > This is happening because the bus is not being properly initialized. > Instead of putting the memory sub-devices inside the memory controller, > it is putting everything under the same directory: > > $ tree /sys/bus/edac/ > /sys/bus/edac/ > ├── devices > │ ├── all_channel_counts -> ../../../devices/system/edac/mc/mc0/all_channel_counts > │ ├── csrow0 -> ../../../devices/system/edac/mc/mc0/csrow0 > │ ├── csrow1 -> ../../../devices/system/edac/mc/mc0/csrow1 > │ ├── csrow2 -> ../../../devices/system/edac/mc/mc0/csrow2 > │ ├── dimm0 -> ../../../devices/system/edac/mc/mc0/dimm0 > │ ├── dimm1 -> ../../../devices/system/edac/mc/mc0/dimm1 > │ ├── dimm3 -> ../../../devices/system/edac/mc/mc0/dimm3 > │ ├── dimm6 -> ../../../devices/system/edac/mc/mc0/dimm6 > │ ├── inject_addrmatch -> ../../../devices/system/edac/mc/mc0/inject_addrmatch > │ ├── mc -> ../../../devices/system/edac/mc > │ └── mc0 -> ../../../devices/system/edac/mc/mc0 > ├── drivers > ├── drivers_autoprobe > ├── drivers_probe > └── uevent > > On a multi-memory controller system, the names "csrow%d" and "dimm%d" > should be under "mc%d", and not at the main hierarchy level. > > So, we need to create a per-MC bus, in order to have its own namespace. > > Reviewed-by: Aristeu Rozanski <arozansk@...hat.com> > Cc: Doug Thompson <norsk5@...oo.com> > Cc: Greg K H <gregkh@...uxfoundation.org> Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> -- 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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