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Mon, 13 Jan 2020 06:46:53 +0000 From: Rajan Vaja To: Sudeep Holla , Jolly Shah CC: "ard.biesheuvel@linaro.org" , "mingo@kernel.org" , "gregkh@linuxfoundation.org" , "matt@codeblueprint.co.uk" , "hkallweit1@gmail.com" , "keescook@chromium.org" , "dmitry.torokhov@gmail.com" , Michal Simek , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Tejas Patel Subject: RE: [PATCH 0/2] arch: arm64: xilinx: Make zynqmp_firmware driver optional Thread-Topic: [PATCH 0/2] arch: arm64: xilinx: Make zynqmp_firmware driver optional Thread-Index: AQHVxx/fTp0hk3voQU+k+EbrUrDiSqfjyxyAgARcgUA= Date: Mon, 13 Jan 2020 06:46:52 +0000 Message-ID: References: <1578596764-29351-1-git-send-email-jolly.shah@xilinx.com> <20200110115415.GC39451@bogus> In-Reply-To: <20200110115415.GC39451@bogus> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=RAJANV@xilinx.com; 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x-microsoft-antispam-message-info: nAKgNQZhGFoNroJhafWP73JhB+Mn6usySi2myHF2ba4sw9b17vs2GkzltV0RyhbK55/1HhtVae14jcyb2BK39XLN+6ftzhfxB2mH9vVqEqnfSTNRkvKjqCHIkML0jbo9b5AqhIeCEJh/I4WFaCSz/86kSLyIn8H6dZP/khVt47cKDym++6kO8bFraRzCxnZ4aKgfxbhBtLhH0IjHVo/+2E9J0MH2CcXnKh7VIRo29RgK/yLXPJXjwCTxVGt6YKjNbIWSs6lqWH4lTKzFHVzbru6Di+SlxsY26VeZ6+QWSpVlLVrWsdJ8OA+bRsVPMcQ/StdNeJK1UhVCC8uDOKeJG/dobwc4xhojJHdmQR1lq0OpaYa2ssvTJhmqw3aT3xg0MpZ4PNqHaZFo0XlCaa0Aq3J168QFgxYbTQ4LUi5fTtBkcHHSzTEiY8hH9EzqK4Vm Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1bcce14a-0afb-4db4-60bf-08d797f45fbe X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Jan 2020 06:46:52.8891 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 6z1nV7YtSIYq67J+gveFWN2FlgQZ+UInLbrkHSVhKNoAIOkHAL+tIJRJgebpl2LYaK0lCCQZT5WuRClMnem3nw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR02MB4007 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sudeep, Thanks for the reviewing patch. > -----Original Message----- > From: Sudeep Holla > Sent: 10 January 2020 05:24 PM > To: Jolly Shah > Cc: ard.biesheuvel@linaro.org; mingo@kernel.org; gregkh@linuxfoundation.o= rg; > matt@codeblueprint.co.uk; hkallweit1@gmail.com; keescook@chromium.org; > dmitry.torokhov@gmail.com; Michal Simek ; Rajan Vaja > ; linux-arm-kernel@lists.infradead.org; linux- > kernel@vger.kernel.org; Sudeep Holla ; Tejas Patel > > Subject: Re: [PATCH 0/2] arch: arm64: xilinx: Make zynqmp_firmware driver > optional >=20 > EXTERNAL EMAIL >=20 > On Thu, Jan 09, 2020 at 11:06:02AM -0800, Jolly Shah wrote: > > From: Tejas Patel > > > > Zynqmp firmware driver requires firmware to be present in system. > > Zynqmp firmware driver will crash if firmware is not present in system. > > For example single arch QEMU, may not have firmware, with such setup > > Linux booting fails. > > > > So make zynqmp_firmware driver as optional to disable it if user don't > > have firmware in system. > > >=20 > Why can't it be detected runtime ? How do you handle single binary if you > make this compile time option ? [Rajan] There is PMU register which indicates if firmware is present or not= , but in case of single arch QEMU that register will not be available so t= here is no way to detect if firmware is present or not from Linux. Linux firmware crashes while arm_smccc_smc() call for firmware, but before = this call there is no way to identify if firmware is present or not. So we= are just giving user an option if they want to use it on single arch Platform they can disable firmware driver. Thanks, Rajan > -- > Regards, > Sudeep