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6bca515917
linux_dsm_epyc7002/arch/powerpc
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Frederic Barrat 6bca515917 powerpc/powernv/npu: Fix oops in pnv_try_setup_npu_table_group() 
With a recent change around IOMMU group, a system with an opencapi
adapter is no longer booting and we get a kernel oops:

  BUG: Kernel NULL pointer dereference at 0x00000028
  Faulting instruction address: 0xc0000000000aa38c
  ...
  NIP pnv_try_setup_npu_table_group+0x1c/0x1a0
  LR  pnv_pci_ioda_fixup+0x1f8/0x660
  Call Trace:
    pnv_try_setup_npu_table_group+0x60/0x
    pnv_pci_ioda_fixup+0x20c/0x660
    pcibios_resource_survey+0x2c8/0x31c
    pcibios_init+0xb0/0xe4
    do_one_initcall+0x64/0x264
    kernel_init_freeable+0x36c/0x468
    kernel_init+0x2c/0x148
    ret_from_kernel_thread+0x5c/0x68

An opencapi device is using a device PE, so the current code breaks
because pe->pbus is not defined.

More generally, there's no need to define an IOMMU group for opencapi,
as the device sends real addresses directly (admittedly, the
virtualization story is yet to be written). So let's fix it by
skipping the IOMMU group setup for opencapi PHBs.

Fixes: 0bd971676e ("powerpc/powernv/npu: Add compound IOMMU groups")
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-01-11 23:45:00 +11:00
..
boot Kbuild updates for v4.21 2018-12-29 12:03:17 -08:00
configs powerpc/configs: Add PPC4xx_OCM to ppc40x_defconfig 2018-12-30 14:00:47 +11:00
crypto powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
include powerpc/perf: Update perf_regs structure to include MMCRA 2019-01-08 19:22:47 +11:00
kernel powerpc/tm: Limit TM code inside PPC_TRANSACTIONAL_MEM 2019-01-11 23:45:00 +11:00
kvm Merge branch 'master' into fixes 2019-01-04 22:07:47 +11:00
lib Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
math-emu License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mm Merge branch 'akpm' (patches from Andrew) 2019-01-05 09:16:18 -08:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-12-10 18:00:43 -08:00
oprofile Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
perf powerpc/perf: Update perf_regs structure to include MMCRA 2019-01-08 19:22:47 +11:00
platforms powerpc/powernv/npu: Fix oops in pnv_try_setup_npu_table_group() 2019-01-11 23:45:00 +11:00
purgatory powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
sysdev Revert "powerpc/fsl_pci: simplify fsl_pci_dma_set_mask" 2018-12-23 20:11:20 -06:00
tools powerpc/tools/checkpatch: Ignore DT_SPLIT_BINDING_PATCH 2018-12-04 19:45:01 +11:00
xmon powerpc/xmon: fix dump_segments() 2018-12-19 18:56:32 +11:00
Kbuild powerpc: Add -Werror at arch/powerpc level 2018-10-19 00:56:17 +11:00
Kconfig Kconfig file consolidation for v4.21 2018-12-29 13:40:29 -08:00
Kconfig.debug powerpc: remove redundant 'default n' from Kconfig-s 2018-10-13 22:21:25 +11:00
Makefile powerpc updates for 4.21 2018-12-27 10:43:24 -08:00
Makefile.postlink License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00