On Wed, 2019-01-09 at 15:13:42 UTC, Frederic Barrat wrote: > 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 > Oops: Kernel access of bad area, sig: 7 [#1] > LE SMP NR_CPUS=2048 NUMA PowerNV > Modules linked in: > CPU: 5 PID: 1 Comm: swapper/4 Not tainted 5.0.0-rc1-fxb-00001-g3bd6e94bec12 > NIP: c0000000000aa38c LR: c0000000000a6608 CTR: c000000000097480 > REGS: c000000005783700 TRAP: 0300 Not tainted (5.0.0-rc1-fxb-00001-g3bd6 > MSR: 9000000002009033 <SF,HV,VEC,EE,ME,IR,DR,RI,LE> CR: 28000228 XER: 20 > CFAR: c0000000000a6604 DAR: 0000000000000028 DSISR: 00080000 IRQMASK: 0 > GPR00: c0000000000a6608 c000000005783990 c000000001036100 c0000007bf761860 > GPR04: 0000000000000000 c000000005783834 0000000000000000 0000000000000000 > GPR08: 69626d2c6e707500 0000000000000000 0000000000000000 9000000002001003 > GPR12: 0000000000000000 c0000007bfff8300 c000000000010450 0000000000000000 > GPR16: c000000000ced938 0000000000000100 c000000000ced948 00000000000a0000 > GPR20: 00000000000bfffe c000000000ced9a8 0000000000000200 c000000000ced978 > GPR24: 00000000006080c0 c000000716d09828 c00000002e6fd000 0000000000000000 > GPR28: c0000007bf4aff68 c0000007bf8d0080 c000000000f23938 c0000007bf761860 > NIP [c0000000000aa38c] pnv_try_setup_npu_table_group+0x1c/0x1a0 > LR [c0000000000a6608] pnv_pci_ioda_fixup+0x1f8/0x660 > Call Trace: > [c000000005783990] [c0000000000aa3d0] pnv_try_setup_npu_table_group+0x60/0x > [c0000000057839d0] [c0000000000a661c] pnv_pci_ioda_fixup+0x20c/0x660 > [c000000005783ab0] [c000000000e1d4c0] pcibios_resource_survey+0x2c8/0x31c > [c000000005783b90] [c000000000e1caf4] pcibios_init+0xb0/0xe4 > [c000000005783c10] [c000000000010054] do_one_initcall+0x64/0x264 > [c000000005783ce0] [c000000000e1132c] kernel_init_freeable+0x36c/0x468 > [c000000005783db0] [c000000000010474] kernel_init+0x2c/0x148 > [c000000005783e20] [c00000000000b794] 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: 0bd971676e68 ("powerpc/powernv/npu: Add compound IOMMU groups") > Signed-off-by: Frederic Barrat <fbar...@linux.ibm.com> > Reviewed-by: Greg Kurz <gr...@kaod.org> > Reviewed-by: Andrew Donnellan <andrew.donnel...@au1.ibm.com>
Applied to powerpc fixes, thanks. https://git.kernel.org/powerpc/c/6bca515917515b66b7e1dfc1d1d3b7bd cheers