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From: Guo Ren <ren_guo@c-sky.com>
To: Greentime Hu <green.hu@gmail.com>
Cc: Greentime <greentime@andestech.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Arnd Bergmann <arnd@arndb.de>,
	linux-arch <linux-arch@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Jason Cooper <jason@lakedaemon.net>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Rob Herring <robh+dt@kernel.org>, netdev <netdev@vger.kernel.org>,
	Vincent Chen <deanbo422@gmail.com>,
	DTML <devicetree@vger.kernel.org>,
	Al Viro <viro@zeniv.linux.org.uk>,
	David Howells <dhowells@redhat.com>,
	Will Deacon <will.deacon@arm.com>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	linux-serial@vger.kernel.org,
	Geert Uytterhoeven <geert.uytterhoeven@gmail.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Mark Rutland <mark.rutland@arm.com>, Greg KH <greg@kroah.com>,
	Vincent Chen <vincentc@andestech.com>
Subject: Re: [PATCH v3 09/33] nds32: Cache and TLB routines
Date: Wed, 13 Dec 2017 17:45:48 +0800	[thread overview]
Message-ID: <20171213094548.GA23563@gary-OptiPlex-3050> (raw)
In-Reply-To: <CAEbi=3fvdWMExreVsSu3TJqXUr5Zpt4k_q=cXXB3miJCvY-+1g@mail.gmail.com>

Hello,

CPU team could improve the tlbop_*. Eg: Design a hardware
internal flag bit for SR_TLB_VPN, tlbop_* will invalid it and mtsr
SR_TLB_VPN will valid it.

So:
On Wed, Dec 13, 2017 at 05:03:33PM +0800, Greentime Hu wrote:
> mtsr addr1 NDS32_SR_TLB_VPN
>     interrupt coming
>         mtsr addr2 NDS32_SR_TLB_VPN <- TLB_VPN has been set to addr2 
	mtsr SR_TLB_VPN will valid the flag bit
>         tlbop_rwr(*pte);
	tlbop_rwr will invalid SR_TLB_VPN flag bit
>     interrupt finish
> tlbop_rwr(*pte); <- it will use the wrong TLB_VPN
Because SR_TLB_VPN is in a invalid state, no operation happen on
tlbop_rwr.

Then they are atomic safe ,no spin_lock_irq need.
:)

 Guo Ren

  reply	other threads:[~2017-12-13  9:46 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-08  9:11 [PATCH v3 00/33] Andes(nds32) Linux Kernel Port Greentime Hu
2017-12-08  9:11 ` [PATCH v3 01/33] asm-generic/io.h: move ioremap_nocache/ioremap_uc/ioremap_wc/ioremap_wt out of ifndef CONFIG_MMU Greentime Hu
2017-12-08  9:11 ` [PATCH v3 02/33] earlycon: add reg-offset to physical address before mapping Greentime Hu
2017-12-08  9:11 ` [PATCH v3 03/33] nds32: Assembly macros and definitions Greentime Hu
2017-12-08  9:11 ` [PATCH v3 04/33] nds32: Kernel booting and initialization Greentime Hu
2017-12-08 13:19   ` Philippe Ombredanne
2017-12-08 13:25     ` Greentime Hu
2017-12-08  9:11 ` [PATCH v3 05/33] nds32: Exception handling Greentime Hu
2017-12-08 15:05   ` Al Viro
2017-12-08  9:11 ` [PATCH v3 06/33] nds32: MMU definitions Greentime Hu
2017-12-08  9:11 ` [PATCH v3 07/33] nds32: MMU initialization Greentime Hu
2017-12-18  9:08   ` Guo Ren
2017-12-18 11:21     ` Greentime Hu
2017-12-18 12:22       ` Guo Ren
2017-12-19  6:56         ` Greentime Hu
2017-12-08  9:11 ` [PATCH v3 08/33] nds32: MMU fault handling and page table management Greentime Hu
2017-12-08  9:11 ` [PATCH v3 09/33] nds32: Cache and TLB routines Greentime Hu
2017-12-13  2:16   ` Guo Ren
2017-12-13  5:45     ` Greentime Hu
2017-12-13  8:19       ` Guo Ren
2017-12-13  8:30         ` Greentime Hu
2017-12-13  8:53           ` Guo Ren
2017-12-13  9:03             ` Greentime Hu
2017-12-13  9:45               ` Guo Ren [this message]
2017-12-13 10:04                 ` Greentime Hu
2017-12-08  9:11 ` [PATCH v3 10/33] nds32: Process management Greentime Hu
2017-12-08  9:11 ` [PATCH v3 11/33] nds32: IRQ handling Greentime Hu
2017-12-08  9:11 ` [PATCH v3 12/33] nds32: Atomic operations Greentime Hu
2017-12-08  9:11 ` [PATCH v3 13/33] nds32: Device specific operations Greentime Hu
2017-12-08  9:11 ` [PATCH v3 14/33] nds32: DMA mapping API Greentime Hu
2017-12-08  9:11 ` [PATCH v3 15/33] nds32: ELF definitions Greentime Hu
2017-12-08  9:11 ` [PATCH v3 16/33] nds32: System calls handling Greentime Hu
2017-12-08  9:12 ` [PATCH v3 17/33] nds32: VDSO support Greentime Hu
2017-12-08 10:21   ` Mark Rutland
2017-12-08 11:54     ` Greentime Hu
2017-12-08 12:14       ` Mark Rutland
2017-12-12  1:58         ` Vincent Chen
2017-12-08 12:29       ` Marc Zyngier
2017-12-08 12:46         ` Greentime Hu
2017-12-08  9:12 ` [PATCH v3 18/33] nds32: Signal handling support Greentime Hu
2017-12-08  9:12 ` [PATCH v3 19/33] nds32: Library functions Greentime Hu
2017-12-08  9:12 ` [PATCH v3 20/33] nds32: Debugging support Greentime Hu
2017-12-08  9:12 ` [PATCH v3 21/33] nds32: L2 cache support Greentime Hu
2017-12-08  9:12 ` [PATCH v3 22/33] nds32: Loadable modules Greentime Hu
2017-12-08  9:12 ` [PATCH v3 23/33] nds32: Generic timers support Greentime Hu
2017-12-08 13:43   ` Linus Walleij
2017-12-08  9:12 ` [PATCH v3 24/33] nds32: Device tree support Greentime Hu
2017-12-08 10:23   ` Mark Rutland
2017-12-08 10:27   ` Mark Rutland
2017-12-08  9:12 ` [PATCH v3 25/33] nds32: Miscellaneous header files Greentime Hu
2017-12-08  9:12 ` [PATCH v3 26/33] nds32: defconfig Greentime Hu
2017-12-08  9:12 ` [PATCH v3 27/33] nds32: Build infrastructure Greentime Hu
2017-12-08  9:12 ` [PATCH v3 28/33] MAINTAINERS: Add nds32 Greentime Hu
2017-12-08  9:12 ` [PATCH v3 29/33] dt-bindings: nds32 CPU Bindings Greentime Hu
2017-12-12 20:10   ` Rob Herring
2017-12-08  9:12 ` [PATCH v3 30/33] dt-bindings: nds32 SoC Bindings Greentime Hu
2017-12-12 20:12   ` Rob Herring
2017-12-08  9:12 ` [PATCH v3 31/33] dt-bindings: interrupt-controller: Andestech Internal Vector Interrupt Controller Greentime Hu
2017-12-12 17:33   ` Rob Herring
2017-12-08  9:12 ` [PATCH v3 32/33] irqchip: Andestech Internal Vector Interrupt Controller driver Greentime Hu
2017-12-11  9:16   ` Marc Zyngier
2017-12-08  9:12 ` [PATCH v3 33/33] net: faraday add nds32 support Greentime Hu

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