* [PATCH 0/2] couple of minor DAWR fixes
@ 2018-04-01 5:50 Nicholas Piggin
2018-04-01 5:50 ` [PATCH 1/2] KVM: PPC: Book3S HV: Fix ppc_breakpoint_available compile error Nicholas Piggin
2018-04-01 5:50 ` [PATCH 2/2] powerpc: Fix DABR write in the case of DAWR disabled Nicholas Piggin
0 siblings, 2 replies; 5+ messages in thread
From: Nicholas Piggin @ 2018-04-01 5:50 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin
Nicholas Piggin (2):
KVM: PPC: Book3S HV: Fix ppc_breakpoint_available compile error
powerpc: Fix DABR write in the case of DAWR disabled
arch/powerpc/kernel/process.c | 13 +++++++++----
arch/powerpc/kvm/book3s_hv.c | 1 +
2 files changed, 10 insertions(+), 4 deletions(-)
--
2.16.3
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH 1/2] KVM: PPC: Book3S HV: Fix ppc_breakpoint_available compile error
2018-04-01 5:50 [PATCH 0/2] couple of minor DAWR fixes Nicholas Piggin
@ 2018-04-01 5:50 ` Nicholas Piggin
2018-04-03 16:03 ` [1/2] " Michael Ellerman
2018-04-01 5:50 ` [PATCH 2/2] powerpc: Fix DABR write in the case of DAWR disabled Nicholas Piggin
1 sibling, 1 reply; 5+ messages in thread
From: Nicholas Piggin @ 2018-04-01 5:50 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin, Michael Neuling
arch/powerpc/kvm/book3s_hv.c: In function ‘kvmppc_h_set_mode’:
arch/powerpc/kvm/book3s_hv.c:745:8: error: implicit declaration of function ‘ppc_breakpoint_available’; did you mean ‘hw_breakpoint_disable’? [-Werror=implicit-function-declaration]
if (!ppc_breakpoint_available())
^~~~~~~~~~~~~~~~~~~~~~~~
hw_breakpoint_disable
Cc: Michael Neuling <mikey@neuling.org>
Fixes: 398e712c00 ("KVM: PPC: Book3S HV: Return error from h_set_mode(SET_DAWR) on POWER9")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/kvm/book3s_hv.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 948642e16338..81e2ea882d97 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -49,6 +49,7 @@
#include <asm/reg.h>
#include <asm/ppc-opcode.h>
#include <asm/asm-prototypes.h>
+#include <asm/debug.h>
#include <asm/disassemble.h>
#include <asm/cputable.h>
#include <asm/cacheflush.h>
--
2.16.3
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH 2/2] powerpc: Fix DABR write in the case of DAWR disabled
2018-04-01 5:50 [PATCH 0/2] couple of minor DAWR fixes Nicholas Piggin
2018-04-01 5:50 ` [PATCH 1/2] KVM: PPC: Book3S HV: Fix ppc_breakpoint_available compile error Nicholas Piggin
@ 2018-04-01 5:50 ` Nicholas Piggin
2018-04-01 7:40 ` Nicholas Piggin
1 sibling, 1 reply; 5+ messages in thread
From: Nicholas Piggin @ 2018-04-01 5:50 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin, Michael Neuling
flush_thread will call set_breakpoint via set_debug_reg_defaults,
and cause POWER8 and above CPUs without the DAWR feature to try
to write to DAWR.
Cc: Michael Neuling <mikey@neuling.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/kernel/process.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 24a591b4dbe9..bfcf5437083c 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -718,7 +718,8 @@ static void set_debug_reg_defaults(struct thread_struct *thread)
{
thread->hw_brk.address = 0;
thread->hw_brk.type = 0;
- set_breakpoint(&thread->hw_brk);
+ if (ppc_breakpoint_available())
+ set_breakpoint(&thread->hw_brk);
}
#endif /* !CONFIG_HAVE_HW_BREAKPOINT */
#endif /* CONFIG_PPC_ADV_DEBUG_REGS */
@@ -814,10 +815,14 @@ void __set_breakpoint(struct arch_hw_breakpoint *brk)
{
memcpy(this_cpu_ptr(¤t_brk), brk, sizeof(*brk));
- if (cpu_has_feature(CPU_FTR_DAWR))
- set_dawr(brk);
- else
+ if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
+ if (cpu_has_feature(CPU_FTR_DAWR))
+ set_dawr(brk);
+ else
+ WARN_ON_ONCE(1);
+ } else {
set_dabr(brk);
+ }
}
void set_breakpoint(struct arch_hw_breakpoint *brk)
--
2.16.3
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH 2/2] powerpc: Fix DABR write in the case of DAWR disabled
2018-04-01 5:50 ` [PATCH 2/2] powerpc: Fix DABR write in the case of DAWR disabled Nicholas Piggin
@ 2018-04-01 7:40 ` Nicholas Piggin
0 siblings, 0 replies; 5+ messages in thread
From: Nicholas Piggin @ 2018-04-01 7:40 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Michael Neuling
On Sun, 1 Apr 2018 15:50:36 +1000
Nicholas Piggin <npiggin@gmail.com> wrote:
> flush_thread will call set_breakpoint via set_debug_reg_defaults,
> and cause POWER8 and above CPUs without the DAWR feature to try
> to write to DAWR.
^^^^
DABR
>
> Cc: Michael Neuling <mikey@neuling.org>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> ---
> arch/powerpc/kernel/process.c | 13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
> index 24a591b4dbe9..bfcf5437083c 100644
> --- a/arch/powerpc/kernel/process.c
> +++ b/arch/powerpc/kernel/process.c
> @@ -718,7 +718,8 @@ static void set_debug_reg_defaults(struct thread_struct *thread)
> {
> thread->hw_brk.address = 0;
> thread->hw_brk.type = 0;
> - set_breakpoint(&thread->hw_brk);
> + if (ppc_breakpoint_available())
> + set_breakpoint(&thread->hw_brk);
> }
> #endif /* !CONFIG_HAVE_HW_BREAKPOINT */
> #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
> @@ -814,10 +815,14 @@ void __set_breakpoint(struct arch_hw_breakpoint *brk)
> {
> memcpy(this_cpu_ptr(¤t_brk), brk, sizeof(*brk));
>
> - if (cpu_has_feature(CPU_FTR_DAWR))
> - set_dawr(brk);
> - else
> + if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
> + if (cpu_has_feature(CPU_FTR_DAWR))
> + set_dawr(brk);
> + else
> + WARN_ON_ONCE(1);
> + } else {
> set_dabr(brk);
> + }
> }
>
> void set_breakpoint(struct arch_hw_breakpoint *brk)
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [1/2] KVM: PPC: Book3S HV: Fix ppc_breakpoint_available compile error
2018-04-01 5:50 ` [PATCH 1/2] KVM: PPC: Book3S HV: Fix ppc_breakpoint_available compile error Nicholas Piggin
@ 2018-04-03 16:03 ` Michael Ellerman
0 siblings, 0 replies; 5+ messages in thread
From: Michael Ellerman @ 2018-04-03 16:03 UTC (permalink / raw)
To: Nicholas Piggin, linuxppc-dev; +Cc: Michael Neuling, Nicholas Piggin
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 731 bytes --]
On Sun, 2018-04-01 at 05:50:35 UTC, Nicholas Piggin wrote:
> arch/powerpc/kvm/book3s_hv.c: In function ‘kvmppc_h_set_mode’:
> arch/powerpc/kvm/book3s_hv.c:745:8: error: implicit declaration of function ‘ppc_breakpoint_available’; did you mean ‘hw_breakpoint_disable’? [-Werror=implicit-function-declaration]
> if (!ppc_breakpoint_available())
> ^~~~~~~~~~~~~~~~~~~~~~~~
> hw_breakpoint_disable
>
> Cc: Michael Neuling <mikey@neuling.org>
> Fixes: 398e712c00 ("KVM: PPC: Book3S HV: Return error from h_set_mode(SET_DAWR) on POWER9")
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Series applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/e303c08787c4cbe1ca07912817dff2
cheers
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-04-03 16:03 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2018-04-01 5:50 [PATCH 0/2] couple of minor DAWR fixes Nicholas Piggin
2018-04-01 5:50 ` [PATCH 1/2] KVM: PPC: Book3S HV: Fix ppc_breakpoint_available compile error Nicholas Piggin
2018-04-03 16:03 ` [1/2] " Michael Ellerman
2018-04-01 5:50 ` [PATCH 2/2] powerpc: Fix DABR write in the case of DAWR disabled Nicholas Piggin
2018-04-01 7:40 ` Nicholas Piggin
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