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powerpc fixes for 5.6 #4

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One fix for a recent regression to our breakpoint/watchpoint code.
 
 Another fix for our KUAP support, this time a missing annotation in a rarely
 used path in signal handling.
 
 A fix for our handling of a CPU feature that effects the PMU, when booting
 guests in some configurations.
 
 A minor fix to our linker script to explicitly include the .BTF section.
 
 Thanks to:
   Christophe Leroy, Desnes A. Nunes do Rosario, Leonardo Bras, Naveen N. Rao,
   Ravi Bangoria, Stefan Berger.
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Merge tag 'powerpc-5.6-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "Some more powerpc fixes for 5.6:

   - One fix for a recent regression to our breakpoint/watchpoint code.

   - Another fix for our KUAP support, this time a missing annotation in
     a rarely used path in signal handling.

   - A fix for our handling of a CPU feature that effects the PMU, when
     booting guests in some configurations.

   - A minor fix to our linker script to explicitly include the .BTF
     section.

  Thanks to: Christophe Leroy, Desnes A. Nunes do Rosario, Leonardo
  Bras, Naveen N. Rao, Ravi Bangoria, Stefan Berger"

* tag 'powerpc-5.6-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/mm: Fix missing KUAP disable in flush_coherent_icache()
  powerpc: fix hardware PMU exception bug on PowerVM compatibility mode systems
  powerpc: Include .BTF section
  powerpc/watchpoint: Don't call dar_within_range() for Book3S
This commit is contained in:
Linus Torvalds 2020-03-07 08:10:34 -06:00
parent cbee7c8b44 59bee45b97
commit 5236647adb
4 changed files with 18 additions and 6 deletions
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4
arch/powerpc/kernel/cputable.c
View file

@ -2193,11 +2193,13 @@ static struct cpu_spec * __init setup_cpu_spec(unsigned long offset,
* oprofile_cpu_type already has a value, then we are
* possibly overriding a real PVR with a logical one,
* and, in that case, keep the current value for
* oprofile_cpu_type.
* oprofile_cpu_type. Futhermore, let's ensure that the
* fix for the PMAO bug is enabled on compatibility mode.
*/
if (old.oprofile_cpu_type != NULL) {
t->oprofile_cpu_type = old.oprofile_cpu_type;
t->oprofile_type = old.oprofile_type;
t->cpu_features |= old.cpu_features & CPU_FTR_PMAO_BUG;
}
}

12
arch/powerpc/kernel/hw_breakpoint.c
View file

@ -331,11 +331,13 @@ int hw_breakpoint_handler(struct die_args *args)
}
info->type &= ~HW_BRK_TYPE_EXTRANEOUS_IRQ;
if (!dar_within_range(regs->dar, info))
info->type |= HW_BRK_TYPE_EXTRANEOUS_IRQ;
if (!IS_ENABLED(CONFIG_PPC_8xx) && !stepping_handler(regs, bp, info))
goto out;
if (IS_ENABLED(CONFIG_PPC_8xx)) {
if (!dar_within_range(regs->dar, info))
info->type |= HW_BRK_TYPE_EXTRANEOUS_IRQ;
} else {
if (!stepping_handler(regs, bp, info))
goto out;
}
/*
* As a policy, the callback is invoked in a 'trigger-after-execute'

6
arch/powerpc/kernel/vmlinux.lds.S
View file

@ -303,6 +303,12 @@ SECTIONS
*(.branch_lt)
}
#ifdef CONFIG_DEBUG_INFO_BTF
.BTF : AT(ADDR(.BTF) - LOAD_OFFSET) {
*(.BTF)
}
#endif
.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
__start_opd = .;
KEEP(*(.opd))

2
arch/powerpc/mm/mem.c
View file

@ -373,7 +373,9 @@ static inline bool flush_coherent_icache(unsigned long addr)
*/
if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) {
mb(); /* sync */
allow_read_from_user((const void __user *)addr, L1_CACHE_BYTES);
icbi((void *)addr);
prevent_read_from_user((const void __user *)addr, L1_CACHE_BYTES);
mb(); /* sync */
isync();
return true;