Re: [PATCH v3 06/24] powerpc/mm: properly set PAGE_KERNEL flags in ioremap()

[LEROY Christophe <christophe.leroy@xxxxxx>]

LEROY Christophe <christophe.leroy@xxxxxx> a écrit :

> Michael Ellerman <mpe@xxxxxxxxxxxxxx> a écrit :
>
> > Christophe Leroy <christophe.leroy@xxxxxx> writes:
> >
> > > Set PAGE_KERNEL directly in the caller and do not rely on a
> > > hack adding PAGE_KERNEL flags when _PAGE_PRESENT is not set.
> > >
> > > As already done for PPC64, use pgprot_cache() helpers instead of
> > > _PAGE_XXX flags in PPC32 ioremap() derived functions.
> > >
> > > Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>
> >
> > Something in here is breaking my p5020ds (both 32-bit and 64-bit):
> >
> > # first bad commit: [cb9220cc18345a2a1ec287752e576a2c88fa4a2b]  
> > powerpc/mm: properly set PAGE_KERNEL flags in ioremap()
>
> Strange, it is calling ioremap_prot(), it should have been calling  
> ioremap_cache() hence ioremap() since patch 4  of the serie. Did  
> patch 4 apply correctly ?

Oops, forget that stupid comment. ioremap_cache() uses ioremap_prot()  
but with the correct flags instead of 0

So patch 4 is needed anyway, because using 0 as flags will now not  
anymore implicitely imply PAGE_KERNEL

Christophe

> Christophe
>
> > 64-bit:
> >
> >  io scheduler mq-deadline registered
> >  io scheduler kyber registered
> >  pcieport 0000:00:00.0: AER enabled with IRQ 482
> >  pcieport 2000:00:00.0: AER enabled with IRQ 480
> >  Unable to handle kernel paging request for data at address  
> > 0x8000080080080000
> >  Faulting instruction address: 0xc0000000000152e4
> >  Oops: Kernel access of bad area, sig: 11 [#1]
> >  BE SMP NR_CPUS=32 CoreNet Generic
> >  Modules linked in:
> >  CPU: 1 PID: 1 Comm: swapper/0 Not tainted  
> > 4.19.0-rc3-gcc-7.3.1-00135-gcb9220cc1834 #16
> >  NIP:  c0000000000152e4 LR: c0000000005173b8 CTR: 0000000000100000
> >  REGS: c0000000f30eb420 TRAP: 0300   Not tainted   
> > (4.19.0-rc3-gcc-7.3.1-00135-gcb9220cc1834)
> >  MSR:  0000000080029000 <CE,EE,ME>  CR: 24000224  XER: 00000000
> >  DEAR: 8000080080080000 ESR: 0000000000800000 IRQMASK: 0
> >  GPR00: c0000000005173a0 c0000000f30eb6a0 c000000000f86e00 8000080080080000
> >  GPR04: 0000000000000000 0000000000400000 00000ffbff000004 0000000000000008
> >  GPR08: 0000000000000000 0000000000100000 0000000000000000 0000000000000080
> >  GPR12: 0000000084000422 c00000003ffff7c0 c00000000000263c 0000000000000000
> >  GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> >  GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> >  GPR24: c000000000dbe0a0 c000000000d41bf8 8000080080080000 c0000000ffff89a8
> >  GPR28: c0000000f3492400 c0000000f3492410 0000000000400000 c000000000ff0a18
> >  NIP [c0000000000152e4] ._memset_io+0x6c/0x9c
> >  LR [c0000000005173b8] .fsl_qman_probe+0x188/0x918
> >  Call Trace:
> >  [c0000000f30eb6a0] [c0000000005173a0] .fsl_qman_probe+0x170/0x918  
> > (unreliable)
> >  [c0000000f30eb740] [c0000000005797dc] .platform_drv_probe+0x58/0xac
> >  [c0000000f30eb7c0] [c0000000005772b0] .really_probe+0x2a8/0x380
> >  [c0000000f30eb860] [c0000000005776f0] .__driver_attach+0x138/0x13c
> >  [c0000000f30eb8f0] [c000000000574550] .bus_for_each_dev+0x9c/0x110
> >  [c0000000f30eb9a0] [c000000000576a18] .driver_attach+0x24/0x38
> >  [c0000000f30eba10] [c0000000005761ec] .bus_add_driver+0x16c/0x2ac
> >  [c0000000f30ebab0] [c000000000578194] .driver_register+0x88/0x178
> >  [c0000000f30ebb30] [c000000000579770] .__platform_driver_register+0x48/0x5c
> >  [c0000000f30ebba0] [c000000000d85744] .fsl_qman_driver_init+0x1c/0x30
> >  [c0000000f30ebc10] [c000000000002374] .do_one_initcall+0x70/0x258
> >  [c0000000f30ebcf0] [c000000000d4a244] .kernel_init_freeable+0x340/0x43c
> >  [c0000000f30ebdb0] [c000000000002658] .kernel_init+0x1c/0x130
> >  [c0000000f30ebe30] [c0000000000009e4] .ret_from_kernel_thread+0x58/0x74
> >  Instruction dump:
> >  4e800020 2ba50003 40dd003c 3925fffc 5488402e 7929f082 7d082378 39290001
> >  550a801e 7d2903a6 7d4a4378 794a0020 <91430000> 38630004 4200fff8 70a50003
> >  ---[ end trace 372a57fd67efb6fe ]---
> >
> > 32 bit:
> >
> >  [    1.076133] pcieport 2000:02:00.0: AER enabled with IRQ 480
> >  [    1.082106] Unable to handle kernel paging request for data at  
> > address 0xf1100000
> >  [    1.089488] Faulting instruction address: 0xc0011c80
> >  [    1.094437] Oops: Kernel access of bad area, sig: 11 [#1]
> >  [    1.099816] BE SMP NR_CPUS=24 CoreNet Generic
> >  [    1.104157] Modules linked in:
> >  [    1.107197] CPU: 0 PID: 1 Comm: swapper/0 Not tainted  
> > 4.19.0-rc3-gcc7x-g8f0c636b0542 #1
> >  [    1.115181] NIP:  c0011c80 LR: c058f970 CTR: 00100000
> >  [    1.120216] REGS: e8107c80 TRAP: 0300   Not tainted   
> > (4.19.0-rc3-gcc7x-g8f0c636b0542)
> >  [    1.128026] MSR:  00029002 <CE,EE,ME>  CR: 24000284  XER: 00000000
> >  [    1.134190] DEAR: f1100000 ESR: 00800000
> >  [    1.134190] GPR00: c058f958 e8107d30 e8108000 f1100000 00000000  
> > 00400000 e8107cd8 e8107d0c
> >  [    1.134190] GPR08: 00000000 00100000 00000000 ff000000 24000282  
> > 00000000 c0003340 00000000
> >  [    1.134190] GPR16: 00000000 00000000 00000000 00000000 c0d64410  
> > c0edb34c c0ec6700 00000007
> >  [    1.134190] GPR24: c0ef0000 f1100000 efffcab8 c0ef0000 e8231c00  
> > e8231c10 0040003f c101d290
> >  [    1.171519] NIP [c0011c80] _memset_io+0x90/0xd0
> >  [    1.176030] LR [c058f970] fsl_qman_probe+0x190/0x8c0
> >  [    1.180975] Call Trace:
> >  [    1.183410] [e8107d30] [c001f6c0] ioremap_prot+0x40/0x50 (unreliable)
> >  [    1.189830] [e8107d40] [c058f958] fsl_qman_probe+0x178/0x8c0
> >  [    1.195475] [e8107d70] [c0600894] platform_drv_probe+0x54/0xb0
> >  [    1.201287] [e8107d90] [c05fe15c] really_probe+0x28c/0x350
> >  [    1.206756] [e8107dc0] [c05fe73c] __driver_attach+0x12c/0x130
> >  [    1.212485] [e8107de0] [c05fb5a8] bus_for_each_dev+0x98/0x110
> >  [    1.218213] [e8107e10] [c05fd048] bus_add_driver+0x158/0x2b0
> >  [    1.223855] [e8107e40] [c05ff1c4] driver_register+0x94/0x180
> >  [    1.229498] [e8107e60] [c0002fc4] do_one_initcall+0x54/0x2d0
> >  [    1.235144] [e8107ed0] [c0d650e8] kernel_init_freeable+0x2e8/0x3bc
> >  [    1.241302] [e8107f20] [c0003364] kernel_init+0x24/0x130
> >  [    1.246599] [e8107f40] [c0015298] ret_from_kernel_thread+0x14/0x1c
> >  [    1.252758] Instruction dump:
> >  [    1.255711] 2b850003 40dd0040 5488402e 3925fffc 7d082378  
> > 5529f0be 550a801e 39290001
> >  [    1.263435] 7d4a4378 7d2903a6 60000000 60000000 <91430000>  
> > 38630004 4200fff8 70a50003
> >  [    1.271337] ---[ end trace f6eb249464967cf7 ]---
> >  [    1.275934]
> >  [    2.277413] BUG: sleeping function called from invalid context  
> > at ./include/linux/percpu-rwsem.h:34
> >  [    2.286358] in_atomic(): 0, irqs_disabled(): 1, pid: 1, name: swapper/0
> >  [    2.292956] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G      D      
> >       4.19.0-rc3-gcc7x-g8f0c636b0542 #1
> >  [    2.302328] Call Trace:
> >  [    2.304762] [e8107b80] [c0aa3774] dump_stack+0x88/0xc4 (unreliable)
> >  [    2.311011] [e8107ba0] [c0074e10] ___might_sleep+0xe0/0x130
> >  [    2.316567] [e8107bb0] [c0055410] exit_signals+0x50/0x2d0
> >  [    2.321949] [e8107bf0] [c00434dc] do_exit+0xcc/0xad0
> >  [    2.326897] [e8107c40] [c000ee98] die+0x228/0x390
> >  [    2.331582] [e8107c70] [c00153f4] handle_page_fault+0x34/0x38
> >  [    2.337311] --- interrupt: 300 at _memset_io+0x90/0xd0
> >  [    2.337311]     LR = fsl_qman_probe+0x190/0x8c0
> >  [    2.346945] [e8107d30] [c001f6c0] ioremap_prot+0x40/0x50 (unreliable)
> >  [    2.353368] [e8107d40] [c058f958] fsl_qman_probe+0x178/0x8c0
> >  [    2.359010] [e8107d70] [c0600894] platform_drv_probe+0x54/0xb0
> >  [    2.364825] [e8107d90] [c05fe15c] really_probe+0x28c/0x350
> >  [    2.370294] [e8107dc0] [c05fe73c] __driver_attach+0x12c/0x130
> >  [    2.376023] [e8107de0] [c05fb5a8] bus_for_each_dev+0x98/0x110
> >  [    2.381751] [e8107e10] [c05fd048] bus_add_driver+0x158/0x2b0
> >  [    2.387394] [e8107e40] [c05ff1c4] driver_register+0x94/0x180
> >  [    2.393035] [e8107e60] [c0002fc4] do_one_initcall+0x54/0x2d0
> >  [    2.398678] [e8107ed0] [c0d650e8] kernel_init_freeable+0x2e8/0x3bc
> >  [    2.404840] [e8107f20] [c0003364] kernel_init+0x24/0x130
> >  [    2.410135] [e8107f40] [c0015298] ret_from_kernel_thread+0x14/0x1c
> >  [    2.416312] Kernel panic - not syncing: Attempted to kill init!  
> > exitcode=0x0000000b
> >
> > cheers


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