linux_dsm_epyc7002/arch/powerpc/platforms
Oliver O'Halloran 42de19d5ef powerpc/pseries/eeh: Allow zero to be a valid PE configuration address
There's no real reason why zero can't be a valid PE configuration address.
Under qemu each sPAPR PHB (i.e. EEH supporting) has the passed-though
devices on bus zero, so the PE address of bus <dddd>:00 should be zero.

However, all previous versions of Linux will reject that, so Qemu at least
goes out of it's way to avoid it. The Qemu implementation of
ibm,get-config-addr-info2 RTAS has the following comment:

> /*
>  * We always have PE address of form "00BB0001". "BB"
>  * represents the bus number of PE's primary bus.
>  */

So qemu puts a one into the register portion of the PE's config_addr to
avoid it being zero. The whole is pretty silly considering that RTAS will
return a negative error code if it can't map the device's config_addr to a
PE.

This patch fixes Linux to treat zero as a valid PE address. This shouldn't
have any real effects due to the Qemu hack mentioned above. And the fact
that Linux EEH has worked historically on PowerVM means they never pass
through devices on bus zero so we would never see the problem there either.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200918093050.37344-8-oohall@gmail.com
2020-10-06 23:22:25 +11:00
..
4xx powerpc/4xx: Don't unmap NULL mbase 2020-05-28 23:24:36 +10:00
8xx mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
40x powerpc: Remove IBM405 Erratum #77 2020-05-28 23:24:36 +10:00
44x powerpc: Move flush_instruction_cache() prototype in asm/cacheflush.h 2020-09-02 11:00:21 +10:00
52xx powerpc updates for 5.9 2020-08-07 10:33:50 -07:00
82xx powerpc/82xx: Blacklist pq2_restart() for kprobe 2020-06-02 20:59:09 +10:00
83xx powerpc: Use simple i2c probe function 2020-09-02 11:00:20 +10:00
85xx powerpc/smp: Move ppc_md.cpu_die() to smp_ops.cpu_offline_self() 2020-09-18 19:59:43 +10:00
86xx mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
512x powerpc/512x: Use dma_request_chan() instead dma_request_slave_channel() 2020-01-06 16:25:29 +11:00
amigaone powerpc/32: drop unused ISA_DMA_THRESHOLD 2020-04-01 14:30:50 +11:00
cell powerpc updates for 5.9 2020-08-07 10:33:50 -07:00
chrp mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
embedded6xx powerpc: Drop _nmask_and_or_msr() 2020-09-02 11:00:20 +10:00
maple mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
pasemi powerpc: use for_each_child_of_node() macro 2020-07-29 22:30:33 +10:00
powermac powerpc/smp: Move ppc_md.cpu_die() to smp_ops.cpu_offline_self() 2020-09-18 19:59:43 +10:00
powernv powerpc/eeh: Move EEH initialisation to an arch initcall 2020-10-06 23:22:25 +11:00
ps3 powerpc/ps3: make two symbols static 2020-09-15 22:13:38 +10:00
pseries powerpc/pseries/eeh: Allow zero to be a valid PE configuration address 2020-10-06 23:22:25 +11:00
fsl_uli1575.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
Kconfig powerpc/tau: Disable TAU between measurements 2020-09-15 22:13:30 +10:00
Kconfig.cputype powerpc/64: Make VDSO32 track COMPAT on 64-bit 2020-09-14 23:07:04 +10:00
Makefile powerpc: Add -Werror at arch/powerpc level 2018-10-19 00:56:17 +11:00