From: Jordan Niethe <jniethe5@gmail.com>
To: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>,
apopple@linux.ibm.com, mikey@neuling.org, miltonm@us.ibm.com,
peterz@infradead.org, oleg@redhat.com,
Nicholas Piggin <npiggin@gmail.com>,
linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
jolsa@kernel.org, fweisbec@gmail.com, pedromfc@br.ibm.com,
naveen.n.rao@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org,
mingo@kernel.org
Subject: Re: [PATCH v4 09/10] powerpc/watchpoint: Return available watchpoints dynamically
Date: Mon, 20 Jul 2020 13:42:42 +1000 [thread overview]
Message-ID: <CACzsE9r0acLUkV35mVxy1AEK_xObs0yz+fD6UdbNdc6uz=Buqw@mail.gmail.com> (raw)
In-Reply-To: <20200717040958.70561-10-ravi.bangoria@linux.ibm.com>
On Fri, Jul 17, 2020 at 2:11 PM Ravi Bangoria
<ravi.bangoria@linux.ibm.com> wrote:
>
> So far Book3S Powerpc supported only one watchpoint. Power10 is
> introducing 2nd DAWR. Enable 2nd DAWR support for Power10.
> Availability of 2nd DAWR will depend on CPU_FTR_DAWR1.
>
> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
> ---
> arch/powerpc/include/asm/cputable.h | 4 +++-
> arch/powerpc/include/asm/hw_breakpoint.h | 5 +++--
> 2 files changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
> index 3445c86e1f6f..36a0851a7a9b 100644
> --- a/arch/powerpc/include/asm/cputable.h
> +++ b/arch/powerpc/include/asm/cputable.h
> @@ -633,7 +633,9 @@ enum {
> * Maximum number of hw breakpoint supported on powerpc. Number of
> * breakpoints supported by actual hw might be less than this.
> */
> -#define HBP_NUM_MAX 1
> +#define HBP_NUM_MAX 2
> +#define HBP_NUM_ONE 1
> +#define HBP_NUM_TWO 2
I wonder if these defines are necessary - has it any advantage over
just using the literal?
>
> #endif /* !__ASSEMBLY__ */
>
> diff --git a/arch/powerpc/include/asm/hw_breakpoint.h b/arch/powerpc/include/asm/hw_breakpoint.h
> index cb424799da0d..d4eab1694bcd 100644
> --- a/arch/powerpc/include/asm/hw_breakpoint.h
> +++ b/arch/powerpc/include/asm/hw_breakpoint.h
> @@ -5,10 +5,11 @@
> * Copyright 2010, IBM Corporation.
> * Author: K.Prasad <prasad@linux.vnet.ibm.com>
> */
> -
Was removing this line deliberate?
> #ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
> #define _PPC_BOOK3S_64_HW_BREAKPOINT_H
>
> +#include <asm/cpu_has_feature.h>
> +
> #ifdef __KERNEL__
> struct arch_hw_breakpoint {
> unsigned long address;
> @@ -46,7 +47,7 @@ struct arch_hw_breakpoint {
>
> static inline int nr_wp_slots(void)
> {
> - return HBP_NUM_MAX;
> + return cpu_has_feature(CPU_FTR_DAWR1) ? HBP_NUM_TWO : HBP_NUM_ONE;
So it'd be something like:
+ return cpu_has_feature(CPU_FTR_DAWR1) ? HBP_NUM_MAX : 1;
But thinking that there might be more slots added in the future, it
may be better to make the number of slots a variable that is set
during the init and then have this function return that.
> }
>
> #ifdef CONFIG_HAVE_HW_BREAKPOINT
> --
> 2.26.2
>
next prev parent reply other threads:[~2020-07-20 3:47 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-17 4:09 [PATCH v4 00/10] powerpc/watchpoint: Enable 2nd DAWR on baremetal and powervm Ravi Bangoria
2020-07-17 4:09 ` [PATCH v4 01/10] powerpc/watchpoint: Fix 512 byte boundary limit Ravi Bangoria
2020-07-17 4:09 ` [PATCH v4 02/10] powerpc/watchpoint: Fix DAWR exception constraint Ravi Bangoria
2020-07-17 4:09 ` [PATCH v4 03/10] powerpc/watchpoint: Fix DAWR exception for CACHEOP Ravi Bangoria
2020-07-17 4:09 ` [PATCH v4 04/10] powerpc/watchpoint: Enable watchpoint functionality on power10 guest Ravi Bangoria
2020-07-17 4:23 ` Jordan Niethe
2020-07-17 4:09 ` [PATCH v4 05/10] powerpc/dt_cpu_ftrs: Add feature for 2nd DAWR Ravi Bangoria
2020-07-17 5:44 ` Jordan Niethe
2020-07-21 7:51 ` Ravi Bangoria
2020-07-21 11:29 ` Michael Ellerman
2020-07-21 13:42 ` Ravi Bangoria
2020-07-21 14:07 ` Michael Ellerman
2020-07-21 14:16 ` Ravi Bangoria
2020-07-17 4:09 ` [PATCH v4 06/10] powerpc/watchpoint: Set CPU_FTR_DAWR1 based on pa-features bit Ravi Bangoria
2020-07-20 1:39 ` Jordan Niethe
2020-07-17 4:09 ` [PATCH v4 07/10] powerpc/watchpoint: Rename current H_SET_MODE DAWR macro Ravi Bangoria
2020-07-20 1:50 ` Jordan Niethe
2020-07-17 4:09 ` [PATCH v4 08/10] powerpc/watchpoint: Guest support for 2nd DAWR hcall Ravi Bangoria
2020-07-17 4:09 ` [PATCH v4 09/10] powerpc/watchpoint: Return available watchpoints dynamically Ravi Bangoria
2020-07-20 3:42 ` Jordan Niethe [this message]
2020-07-21 3:57 ` Ravi Bangoria
2020-07-21 4:41 ` Jordan Niethe
2020-07-21 8:15 ` Ravi Bangoria
2020-07-21 11:36 ` Michael Ellerman
2020-07-21 13:33 ` Ravi Bangoria
2020-07-17 4:09 ` [PATCH v4 10/10] powerpc/watchpoint: Remove 512 byte boundary Ravi Bangoria
2020-07-20 6:54 ` Jordan Niethe
2020-07-21 3:24 ` Ravi Bangoria
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