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[73.241.114.122]) by smtp.gmail.com with ESMTPSA id q3sm9871423pfg.22.2020.05.23.18.47.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 May 2020 18:47:24 -0700 (PDT) Date: Sat, 23 May 2020 18:47:21 -0700 From: Richard Cochran To: Jianyong Wu Subject: Re: [RFC PATCH v12 10/11] arm64: add mechanism to let user choose which counter to return Message-ID: <20200524014721.GB335@localhost> References: <20200522083724.38182-1-jianyong.wu@arm.com> <20200522083724.38182-11-jianyong.wu@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200522083724.38182-11-jianyong.wu@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) Cc: maz@kernel.org, justin.he@arm.com, Wei.Chen@arm.com, kvm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, sean.j.christopherson@intel.com, steven.price@arm.com, john.stultz@linaro.org, yangbo.lu@nxp.com, pbonzini@redhat.com, tglx@linutronix.de, nd@arm.com, will@kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Fri, May 22, 2020 at 04:37:23PM +0800, Jianyong Wu wrote: > To use this feature, you should call PTP_EXTTS_REQUEST(2) ioctl with flag > set bit PTP_KVM_ARM_PHY_COUNTER in its argument then call > PTP_SYS_OFFSET_PRECISE(2) ioctl to get the cross timestamp and phyical > counter will return. If the bit not set or no call for PTP_EXTTS_REQUEST2, > virtual counter will return by default. I'm sorry, but NAK on this completely bizarre twisting of the user space API. > diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c > index fef72f29f3c8..8b0a7b328bcd 100644 > --- a/drivers/ptp/ptp_chardev.c > +++ b/drivers/ptp/ptp_chardev.c > @@ -123,6 +123,9 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) > struct timespec64 ts; > int enable, err = 0; > > +#ifdef CONFIG_ARM64 > + static long flag; > +#endif > switch (cmd) { > > case PTP_CLOCK_GETCAPS: > @@ -149,6 +152,24 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) > err = -EFAULT; > break; > } > + > +#ifdef CONFIG_ARM64 > + /* > + * Just using this ioctl to tell kvm ptp driver to get PHC > + * with physical counter, so if bit PTP_KVM_ARM_PHY_COUNTER > + * is set then just exit directly. > + * In most cases, we just need virtual counter from host and > + * there is limited scenario using this to get physical counter > + * in guest. > + * Be careful to use this as there is no way to set it back > + * unless you reinstall the module. > + * This is only for arm64. > + */ > + if (req.extts.flags & PTP_KVM_ARM_PHY_COUNTER) { > + flag = 1; > + break; > + } > +#endif This file contains the generic PTP Hardware Clock character device implementation. It is no place for platform specific hacks. Sorry, Richard _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm