From: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
To: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: mpe@ellerman.id.au, mikey@neuling.org, apopple@linux.ibm.com,
paulus@samba.org, npiggin@gmail.com,
naveen.n.rao@linux.vnet.ibm.com, peterz@infradead.org,
jolsa@kernel.org, oleg@redhat.com, fweisbec@gmail.com,
mingo@kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org,
Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Subject: Re: [PATCH 07/15] powerpc/watchpoint: Get watchpoint count dynamically while disabling them
Date: Thu, 26 Mar 2020 09:02:05 +0530 [thread overview]
Message-ID: <a7cde9ea-02d6-a5f9-3124-6047b4e1c622@linux.ibm.com> (raw)
In-Reply-To: <cca28aeb-d1f8-5668-0743-2269f621e926@linux.ibm.com>
On 3/18/20 12:27 PM, Ravi Bangoria wrote:
>
>
> On 3/17/20 4:02 PM, Christophe Leroy wrote:
>>
>>
>> Le 09/03/2020 à 09:57, Ravi Bangoria a écrit :
>>> Instead of disabling only one watchpooint, get num of available
>>> watchpoints dynamically and disable all of them.
>>>
>>> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
>>> ---
>>> arch/powerpc/include/asm/hw_breakpoint.h | 15 +++++++--------
>>> 1 file changed, 7 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/arch/powerpc/include/asm/hw_breakpoint.h b/arch/powerpc/include/asm/hw_breakpoint.h
>>> index 980ac7d9f267..ec61e2b7195c 100644
>>> --- a/arch/powerpc/include/asm/hw_breakpoint.h
>>> +++ b/arch/powerpc/include/asm/hw_breakpoint.h
>>> @@ -75,14 +75,13 @@ extern void ptrace_triggered(struct perf_event *bp,
>>> struct perf_sample_data *data, struct pt_regs *regs);
>>> static inline void hw_breakpoint_disable(void)
>>> {
>>> - struct arch_hw_breakpoint brk;
>>> -
>>> - brk.address = 0;
>>> - brk.type = 0;
>>> - brk.len = 0;
>>> - brk.hw_len = 0;
>>> - if (ppc_breakpoint_available())
>>> - __set_breakpoint(&brk, 0);
>>> + int i;
>>> + struct arch_hw_breakpoint null_brk = {0};
>>> +
>>> + if (ppc_breakpoint_available()) {
>>
>> I think this test should go into nr_wp_slots() which should return zero when no breakpoint is available.
>
> Seems possible. Will change it in next version.
Once we move ppc_breakpoint_available() logic into nr_wp_slots(),
'dawr_force_enable' variable is checked in nr_wp_slots() before
it gets initialized in dawr_force_setup():
start_kernel()
|-> perf_event_init()
| init_hw_breakpoint()
| hw_breakpoint_slots()
| nr_wp_slots()
| /* Check dawr_force_enable variable */
|
|-> arch_call_rest_init()
rest_init()
kernel_thread(kernel_init, ...)
...
kernel_init()
kernel_init_freeable()
...
do_one_initcall()
dawr_force_setup()
/* Set dawr_force_enable = true */
Because of this, hw-breakpoint infrastructure is initialized with
no DAWRs. So I'm thinking to keep the code as it is i.e. not moving
ppc_breakpoint_available() test inside nr_wp_slots().
Ravi
next prev parent reply other threads:[~2020-03-26 3:32 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-09 8:57 [PATCH 00/15] powerpc/watchpoint: Preparation for more than one watchpoint Ravi Bangoria
2020-03-09 8:57 ` [PATCH 01/15] powerpc/watchpoint: Rename current DAWR macros Ravi Bangoria
2020-03-17 10:14 ` Christophe Leroy
2020-03-18 12:40 ` Ravi Bangoria
2020-03-09 8:57 ` [PATCH 02/15] powerpc/watchpoint: Add SPRN macros for second DAWR Ravi Bangoria
2020-03-17 10:16 ` Christophe Leroy
2020-03-18 18:30 ` Segher Boessenkool
2020-03-09 8:57 ` [PATCH 03/15] powerpc/watchpoint: Introduce function to get nr watchpoints dynamically Ravi Bangoria
2020-03-17 10:21 ` Christophe Leroy
2020-03-18 5:50 ` Ravi Bangoria
2020-03-09 8:57 ` [PATCH 04/15] powerpc/watchpoint/ptrace: Return actual num of available watchpoints Ravi Bangoria
2020-03-09 8:57 ` [PATCH 05/15] powerpc/watchpoint: Provide DAWR number to set_dawr Ravi Bangoria
2020-03-17 10:28 ` Christophe Leroy
2020-03-18 6:18 ` Ravi Bangoria
2020-03-09 8:57 ` [PATCH 06/15] powerpc/watchpoint: Provide DAWR number to __set_breakpoint Ravi Bangoria
2020-03-09 8:57 ` [PATCH 07/15] powerpc/watchpoint: Get watchpoint count dynamically while disabling them Ravi Bangoria
2020-03-17 10:32 ` Christophe Leroy
2020-03-18 6:57 ` Ravi Bangoria
2020-03-26 3:32 ` Ravi Bangoria [this message]
2020-03-09 8:57 ` [PATCH 08/15] powerpc/watchpoint: Disable all available watchpoints when !dawr_force_enable Ravi Bangoria
2020-03-17 10:35 ` Christophe Leroy
2020-03-18 7:32 ` Ravi Bangoria
2020-03-09 8:58 ` [PATCH 09/15] powerpc/watchpoint: Convert thread_struct->hw_brk to an array Ravi Bangoria
2020-03-17 10:37 ` Christophe Leroy
2020-03-18 8:36 ` Ravi Bangoria
2020-03-18 8:56 ` Christophe Leroy
2020-03-18 9:22 ` Ravi Bangoria
2020-03-09 8:58 ` [PATCH 10/15] powerpc/watchpoint: Use loop for thread_struct->ptrace_bps Ravi Bangoria
2020-03-17 10:48 ` Christophe Leroy
2020-03-18 9:43 ` Ravi Bangoria
2020-03-09 8:58 ` [PATCH 11/15] powerpc/watchpoint: Introduce is_ptrace_bp() function Ravi Bangoria
2020-03-17 10:49 ` Christophe Leroy
2020-03-09 8:58 ` [PATCH 12/15] powerpc/watchpoint: Prepare handler to handle more than one watcnhpoint Ravi Bangoria
2020-03-17 10:59 ` Christophe Leroy
2020-03-18 11:35 ` Michael Ellerman
2020-03-18 11:44 ` Christophe Leroy
2020-03-18 21:27 ` Segher Boessenkool
2020-03-18 23:36 ` Michael Ellerman
2020-03-18 12:14 ` Ravi Bangoria
2020-03-09 8:58 ` [PATCH 13/15] powerpc/watchpoint: Don't allow concurrent perf and ptrace events Ravi Bangoria
2020-03-17 11:08 ` Christophe Leroy
2020-03-18 12:35 ` Ravi Bangoria
2020-03-09 8:58 ` [PATCH 14/15] powerpc/watchpoint/xmon: Don't allow breakpoint overwriting Ravi Bangoria
2020-03-17 11:10 ` Christophe Leroy
2020-03-18 12:37 ` Ravi Bangoria
2020-03-18 13:31 ` Christophe Leroy
2020-03-09 8:58 ` [PATCH 15/15] powerpc/watchpoint/xmon: Support 2nd dawr Ravi Bangoria
2020-03-17 11:14 ` Christophe Leroy
2020-03-18 12:39 ` Ravi Bangoria
2020-03-16 15:05 ` [PATCH 00/15] powerpc/watchpoint: Preparation for more than one watchpoint Christophe Leroy
2020-03-16 18:43 ` Segher Boessenkool
2020-03-17 5:56 ` Christophe Leroy
2020-03-18 12:52 ` Ravi Bangoria
2020-03-23 13:37 ` Ravi Bangoria
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