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author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-05 12:39:30 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-05 12:39:30 -0700 |
commit | 7ae77150d94d3b535c7b85e6b3647113095e79bf (patch) | |
tree | 90fe894e7efd92898e813d88acfd4611d79be969 /arch/powerpc/kernel/exceptions-64s.S | |
parent | Merge tag 'modules-for-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux (diff) | |
parent | Merge branch 'topic/ppc-kvm' into next (diff) | |
download | linux-dev-7ae77150d94d3b535c7b85e6b3647113095e79bf.tar.xz linux-dev-7ae77150d94d3b535c7b85e6b3647113095e79bf.zip |
Merge tag 'powerpc-5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc updates from Michael Ellerman:
- Support for userspace to send requests directly to the on-chip GZIP
accelerator on Power9.
- Rework of our lockless page table walking (__find_linux_pte()) to
make it safe against parallel page table manipulations without
relying on an IPI for serialisation.
- A series of fixes & enhancements to make our machine check handling
more robust.
- Lots of plumbing to add support for "prefixed" (64-bit) instructions
on Power10.
- Support for using huge pages for the linear mapping on 8xx (32-bit).
- Remove obsolete Xilinx PPC405/PPC440 support, and an associated sound
driver.
- Removal of some obsolete 40x platforms and associated cruft.
- Initial support for booting on Power10.
- Lots of other small features, cleanups & fixes.
Thanks to: Alexey Kardashevskiy, Alistair Popple, Andrew Donnellan,
Andrey Abramov, Aneesh Kumar K.V, Balamuruhan S, Bharata B Rao, Bulent
Abali, Cédric Le Goater, Chen Zhou, Christian Zigotzky, Christophe
JAILLET, Christophe Leroy, Dmitry Torokhov, Emmanuel Nicolet, Erhard F.,
Gautham R. Shenoy, Geoff Levand, George Spelvin, Greg Kurz, Gustavo A.
R. Silva, Gustavo Walbon, Haren Myneni, Hari Bathini, Joel Stanley,
Jordan Niethe, Kajol Jain, Kees Cook, Leonardo Bras, Madhavan
Srinivasan., Mahesh Salgaonkar, Markus Elfring, Michael Neuling, Michal
Simek, Nathan Chancellor, Nathan Lynch, Naveen N. Rao, Nicholas Piggin,
Oliver O'Halloran, Paul Mackerras, Pingfan Liu, Qian Cai, Ram Pai,
Raphael Moreira Zinsly, Ravi Bangoria, Sam Bobroff, Sandipan Das, Segher
Boessenkool, Stephen Rothwell, Sukadev Bhattiprolu, Tyrel Datwyler,
Wolfram Sang, Xiongfeng Wang.
* tag 'powerpc-5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (299 commits)
powerpc/pseries: Make vio and ibmebus initcalls pseries specific
cxl: Remove dead Kconfig options
powerpc: Add POWER10 architected mode
powerpc/dt_cpu_ftrs: Add MMA feature
powerpc/dt_cpu_ftrs: Enable Prefixed Instructions
powerpc/dt_cpu_ftrs: Advertise support for ISA v3.1 if selected
powerpc: Add support for ISA v3.1
powerpc: Add new HWCAP bits
powerpc/64s: Don't set FSCR bits in INIT_THREAD
powerpc/64s: Save FSCR to init_task.thread.fscr after feature init
powerpc/64s: Don't let DT CPU features set FSCR_DSCR
powerpc/64s: Don't init FSCR_DSCR in __init_FSCR()
powerpc/32s: Fix another build failure with CONFIG_PPC_KUAP_DEBUG
powerpc/module_64: Use special stub for _mcount() with -mprofile-kernel
powerpc/module_64: Simplify check for -mprofile-kernel ftrace relocations
powerpc/module_64: Consolidate ftrace code
powerpc/32: Disable KASAN with pages bigger than 16k
powerpc/uaccess: Don't set KUEP by default on book3s/32
powerpc/uaccess: Don't set KUAP by default on book3s/32
powerpc/8xx: Reduce time spent in allow_user_access() and friends
...
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64s.S')
-rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 51 |
1 files changed, 38 insertions, 13 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index ebeebab74b56..e70ebb5c318c 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -939,13 +939,13 @@ EXC_COMMON_BEGIN(system_reset_common) * the right thing. We do not want to reconcile because that goes * through irq tracing which we don't want in NMI. * - * Save PACAIRQHAPPENED to _DAR (otherwise unused), and set HARD_DIS + * Save PACAIRQHAPPENED to RESULT (otherwise unused), and set HARD_DIS * as we are running with MSR[EE]=0. */ li r10,IRQS_ALL_DISABLED stb r10,PACAIRQSOFTMASK(r13) lbz r10,PACAIRQHAPPENED(r13) - std r10,_DAR(r1) + std r10,RESULT(r1) ori r10,r10,PACA_IRQ_HARD_DIS stb r10,PACAIRQHAPPENED(r13) @@ -966,12 +966,12 @@ EXC_COMMON_BEGIN(system_reset_common) /* * Restore soft mask settings. */ - ld r10,_DAR(r1) + ld r10,RESULT(r1) stb r10,PACAIRQHAPPENED(r13) ld r10,SOFTE(r1) stb r10,PACAIRQSOFTMASK(r13) - kuap_restore_amr r10 + kuap_restore_amr r9, r10 EXCEPTION_RESTORE_REGS RFI_TO_USER_OR_KERNEL @@ -1117,11 +1117,30 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) li r10,MSR_RI mtmsrd r10,1 + /* + * Set IRQS_ALL_DISABLED and save PACAIRQHAPPENED (see + * system_reset_common) + */ + li r10,IRQS_ALL_DISABLED + stb r10,PACAIRQSOFTMASK(r13) + lbz r10,PACAIRQHAPPENED(r13) + std r10,RESULT(r1) + ori r10,r10,PACA_IRQ_HARD_DIS + stb r10,PACAIRQHAPPENED(r13) + addi r3,r1,STACK_FRAME_OVERHEAD bl machine_check_early std r3,RESULT(r1) /* Save result */ ld r12,_MSR(r1) + /* + * Restore soft mask settings. + */ + ld r10,RESULT(r1) + stb r10,PACAIRQHAPPENED(r13) + ld r10,SOFTE(r1) + stb r10,PACAIRQSOFTMASK(r13) + #ifdef CONFIG_PPC_P7_NAP /* * Check if thread was in power saving mode. We come here when any @@ -1225,17 +1244,19 @@ EXC_COMMON_BEGIN(machine_check_idle_common) bl machine_check_queue_event /* - * We have not used any non-volatile GPRs here, and as a rule - * most exception code including machine check does not. - * Therefore PACA_NAPSTATELOST does not need to be set. Idle - * wakeup will restore volatile registers. + * GPR-loss wakeups are relatively straightforward, because the + * idle sleep code has saved all non-volatile registers on its + * own stack, and r1 in PACAR1. * - * Load the original SRR1 into r3 for pnv_powersave_wakeup_mce. + * For no-loss wakeups the r1 and lr registers used by the + * early machine check handler have to be restored first. r2 is + * the kernel TOC, so no need to restore it. * * Then decrement MCE nesting after finishing with the stack. */ ld r3,_MSR(r1) ld r4,_LINK(r1) + ld r1,GPR1(r1) lhz r11,PACA_IN_MCE(r13) subi r11,r11,1 @@ -1244,7 +1265,7 @@ EXC_COMMON_BEGIN(machine_check_idle_common) mtlr r4 rlwinm r10,r3,47-31,30,31 cmpwi cr1,r10,2 - bltlr cr1 /* no state loss, return to idle caller */ + bltlr cr1 /* no state loss, return to idle caller with r3=SRR1 */ b idle_return_gpr_loss #endif @@ -1266,6 +1287,10 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) andc r10,r10,r3 mtmsrd r10 + lhz r12,PACA_IN_MCE(r13) + subi r12,r12,1 + sth r12,PACA_IN_MCE(r13) + /* Invoke machine_check_exception to print MCE event and panic. */ addi r3,r1,STACK_FRAME_OVERHEAD bl machine_check_exception @@ -2740,7 +2765,7 @@ EXC_COMMON_BEGIN(soft_nmi_common) li r10,IRQS_ALL_DISABLED stb r10,PACAIRQSOFTMASK(r13) lbz r10,PACAIRQHAPPENED(r13) - std r10,_DAR(r1) + std r10,RESULT(r1) ori r10,r10,PACA_IRQ_HARD_DIS stb r10,PACAIRQHAPPENED(r13) @@ -2754,12 +2779,12 @@ EXC_COMMON_BEGIN(soft_nmi_common) /* * Restore soft mask settings. */ - ld r10,_DAR(r1) + ld r10,RESULT(r1) stb r10,PACAIRQHAPPENED(r13) ld r10,SOFTE(r1) stb r10,PACAIRQSOFTMASK(r13) - kuap_restore_amr r10 + kuap_restore_amr r9, r10 EXCEPTION_RESTORE_REGS hsrr=0 RFI_TO_KERNEL |