From: Marc Zyngier <maz@kernel.org>
To: Zhenyu Ye <yezhenyu2@huawei.com>
Cc: <will@kernel.org>, <mark.rutland@arm.com>,
<catalin.marinas@arm.com>, <aneesh.kumar@linux.ibm.com>,
<akpm@linux-foundation.org>, <npiggin@gmail.com>,
<peterz@infradead.org>, <arnd@arndb.de>, <rostedt@goodmis.org>,
<suzuki.poulose@arm.com>, <tglx@linutronix.de>,
<yuzhao@google.com>, <Dave.Martin@arm.com>,
<steven.price@arm.com>, <broonie@kernel.org>,
<guohanjun@huawei.com>, <linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <linux-arch@vger.kernel.org>,
<linux-mm@kvack.org>, <arm@kernel.org>, <xiexiangyou@huawei.com>,
<prime.zeng@hisilicon.com>, <zhangshaokun@hisilicon.com>
Subject: Re: [RFC PATCH v4 3/6] arm64: Add level-hinted TLB invalidation helper to tlbi_user
Date: Tue, 24 Mar 2020 14:19:39 +0000 [thread overview]
Message-ID: <20200324141939.51917225@why> (raw)
In-Reply-To: <20200324134534.1570-4-yezhenyu2@huawei.com>
On Tue, 24 Mar 2020 21:45:31 +0800
Zhenyu Ye <yezhenyu2@huawei.com> wrote:
> Add a level-hinted parameter to __tlbi_user, which only gets used
> if ARMv8.4-TTL gets detected.
>
> ARMv8.4-TTL provides the TTL field in tlbi instruction to indicate
> the level of translation table walk holding the leaf entry for the
> address that is being invalidated.
>
> This patch set the default level value to 0.
>
> Signed-off-by: Zhenyu Ye <yezhenyu2@huawei.com>
> ---
> arch/arm64/include/asm/tlbflush.h | 42 ++++++++++++++++++++++++++-----
> 1 file changed, 36 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
> index a3f70778a325..d141c080e494 100644
> --- a/arch/arm64/include/asm/tlbflush.h
> +++ b/arch/arm64/include/asm/tlbflush.h
> @@ -89,6 +89,36 @@
> __tlbi(op, arg); \
> } while(0)
>
> +#define __tlbi_user_level(op, addr, level) \
> + do { \
> + u64 arg = addr; \
> + \
> + if (!arm64_kernel_unmapped_at_el0()) \
> + break; \
> + \
> + if (cpus_have_const_cap(ARM64_HAS_ARMv8_4_TTL) && \
> + level) { \
> + u64 ttl = level; \
> + \
> + switch (PAGE_SIZE) { \
> + case SZ_4K: \
> + ttl |= 1 << 2; \
> + break; \
> + case SZ_16K: \
> + ttl |= 2 << 2; \
> + break; \
> + case SZ_64K: \
> + ttl |= 3 << 2; \
> + break; \
> + } \
> + \
> + arg &= ~TLBI_TTL_MASK; \
> + arg |= FIELD_PREP(TLBI_TTL_MASK, ttl); \
> + } \
> + \
> + __tlbi(op, (arg) | USER_ASID_FLAG);
> \
> + } while (0)
> +
Isn't this just:
define __tlbi_user_level(op, addr, level) \
do { \
if (!arm64_kernel_unmapped_at_el0()) \
break; \
\
__tlbi_level(op, addr | USER_ASID_FLAG, level); \
} while (0)
Thanks,
M.
--
Jazz is not dead. It just smells funny...
next prev parent reply other threads:[~2020-03-24 14:19 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-24 13:45 [RFC PATCH v4 0/6] arm64: tlb: add support for TTL feature Zhenyu Ye
2020-03-24 13:45 ` [RFC PATCH v4 1/6] arm64: Detect the ARMv8.4 " Zhenyu Ye
2020-03-24 13:45 ` [RFC PATCH v4 2/6] arm64: Add level-hinted TLB invalidation helper Zhenyu Ye
2020-03-24 13:45 ` [RFC PATCH v4 3/6] arm64: Add level-hinted TLB invalidation helper to tlbi_user Zhenyu Ye
2020-03-24 14:19 ` Marc Zyngier [this message]
2020-03-25 2:47 ` Zhenyu Ye
2020-03-24 13:45 ` [RFC PATCH v4 4/6] mm: Add page table level flags to vm_flags Zhenyu Ye
2020-03-24 18:44 ` Steven Rostedt
2020-03-25 2:10 ` yezhenyu (A)
2020-03-24 13:45 ` [RFC PATCH v4 5/6] arm64: tlb: Use translation level hint in vm_flags Zhenyu Ye
2020-03-24 14:45 ` Marc Zyngier
2020-03-25 8:00 ` Zhenyu Ye
2020-03-25 14:13 ` Marc Zyngier
2020-03-26 7:11 ` Zhenyu Ye
2020-03-24 13:45 ` [RFC PATCH v4 6/6] mm: Set VM_LEVEL flags in some tlb_flush functions Zhenyu Ye
2020-03-24 15:01 ` [RFC PATCH v4 0/6] arm64: tlb: add support for TTL feature Peter Zijlstra
2020-03-25 4:49 ` Zhenyu Ye
2020-03-25 13:32 ` Peter Zijlstra
2020-03-26 7:15 ` Zhenyu Ye
2020-03-25 16:15 ` James Morse
2020-03-25 16:41 ` Peter Zijlstra
2020-03-26 6:45 ` Zhenyu Ye
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200324141939.51917225@why \
--to=maz@kernel.org \
--cc=Dave.Martin@arm.com \
--cc=akpm@linux-foundation.org \
--cc=aneesh.kumar@linux.ibm.com \
--cc=arm@kernel.org \
--cc=arnd@arndb.de \
--cc=broonie@kernel.org \
--cc=catalin.marinas@arm.com \
--cc=guohanjun@huawei.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mark.rutland@arm.com \
--cc=npiggin@gmail.com \
--cc=peterz@infradead.org \
--cc=prime.zeng@hisilicon.com \
--cc=rostedt@goodmis.org \
--cc=steven.price@arm.com \
--cc=suzuki.poulose@arm.com \
--cc=tglx@linutronix.de \
--cc=will@kernel.org \
--cc=xiexiangyou@huawei.com \
--cc=yezhenyu2@huawei.com \
--cc=yuzhao@google.com \
--cc=zhangshaokun@hisilicon.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).