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Tue, 27 Aug 2019 20:37:28 +0000 From: Atish Patra To: "hch@infradead.org" CC: "linux-riscv@lists.infradead.org" , "alankao@andestech.com" , "gregkh@linuxfoundation.org" , "gary@garyguo.net" , "rppt@linux.ibm.com" , "paul.walmsley@sifive.com" , "aou@eecs.berkeley.edu" , "linux-kernel@vger.kernel.org" , "tglx@linutronix.de" , "anup@brainfault.org" , "alexios.zavras@intel.com" , "palmer@sifive.com" Subject: Re: [RFC PATCH 1/2] RISC-V: Mark existing SBI as legacy SBI. Thread-Topic: [RFC PATCH 1/2] RISC-V: Mark existing SBI as legacy SBI. 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Tue, 27 Aug 2019 20:37:28 +0000 From: Atish Patra To: "hch@infradead.org" Subject: Re: [RFC PATCH 1/2] RISC-V: Mark existing SBI as legacy SBI. Thread-Topic: [RFC PATCH 1/2] RISC-V: Mark existing SBI as legacy SBI. Thread-Index: AQHVXGawW0XtdcDDakm9TmNp3/W3LacPB3wAgABuMYA= Date: Tue, 27 Aug 2019 20:37:27 +0000 Message-ID: References: <20190826233256.32383-1-atish.patra@wdc.com> <20190826233256.32383-2-atish.patra@wdc.com> <20190827140304.GA21855@infradead.org> In-Reply-To: <20190827140304.GA21855@infradead.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Atish.Patra@wdc.com; x-originating-ip: [199.255.44.250] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 8021e8da-861b-4715-cdf8-08d72b2e6070 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0; PCL:0; RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600166)(711020)(4605104)(1401327)(4618075)(2017052603328)(7193020); SRVR:BYAPR04MB5079; x-ms-traffictypediagnostic: BYAPR04MB5079: x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:8882; x-forefront-prvs: 0142F22657 x-forefront-antispam-report: SFV:NSPM; SFS:(10019020)(4636009)(396003)(366004)(39860400002)(376002)(346002)(136003)(189003)(199004)(66946007)(5640700003)(2616005)(53936002)(6436002)(6116002)(3846002)(11346002)(446003)(76176011)(66556008)(316002)(229853002)(66476007)(66066001)(118296001)(7736002)(102836004)(6506007)(2351001)(6916009)(76116006)(478600001)(305945005)(6512007)(476003)(186003)(6246003)(36756003)(486006)(26005)(66446008)(64756008)(54906003)(2906002)(256004)(14454004)(25786009)(7416002)(86362001)(6486002)(8936002)(71190400001)(8676002)(71200400001)(1730700003)(81166006)(81156014)(5660300002)(99286004)(4326008)(2501003); DIR:OUT; SFP:1102; SCL:1; SRVR:BYAPR04MB5079; H:BYAPR04MB3990.namprd04.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; MX:1; A:1; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: moHSN5wxX+oVwXiIMMb1VIBUa2E1EtofZdpZ+KZsG3KcQnfsAxSVYAUf/j4WWzMk+Bfg0tq7NfvmhHQvAXxmCOjwVLuNefLfUTcJE5HTA2AmyIqr5qHv+25eFMo9fmOzt1YyT244br88ZA5bY4qsxQhSbOFM9JYVbeNWBn8NfTzbB3c2P7mvDuYJwl1Yfv7QRzLElfR4iWJdGc2SeHhfY636xBOyhiIWyNNnCzOHaaJiJZkEawJWnsklyE5Ct/Lw87dAHSYLyW/WGkVyNCRr6CPMohbAWKsIrBsJ4y9XfeyU5t5ZQBiwUDVDLq/FxYUmurwYp3L1o3qXXLc/nu8IxqdW1FW9MVQiyu2TYnef7lCRLPaszND0W9znn0mAC+Ku2kHVLe9Z4xD3PR/C8zgJfNDNlCYLTS2ByLzKlP9nIaU= x-ms-exchange-transport-forked: True Content-ID: MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8021e8da-861b-4715-cdf8-08d72b2e6070 X-MS-Exchange-CrossTenant-originalarrivaltime: 27 Aug 2019 20:37:27.9991 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: kZDeexZVHJ1tFVtPKh7fZ3pFZthKakuPKDMc+ZW+EFfbUYjXrKdV9y2SWPzJUVzjICyz73eAC3W6oLGmwyInfw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR04MB5079 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190827_133733_370887_4AE37CD5 X-CRM114-Status: GOOD ( 14.19 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "aou@eecs.berkeley.edu" , "alankao@andestech.com" , "gregkh@linuxfoundation.org" , "anup@brainfault.org" , "palmer@sifive.com" , "linux-kernel@vger.kernel.org" , "rppt@linux.ibm.com" , "alexios.zavras@intel.com" , "gary@garyguo.net" , "paul.walmsley@sifive.com" , "linux-riscv@lists.infradead.org" , "tglx@linutronix.de" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org On Tue, 2019-08-27 at 07:03 -0700, Christoph Hellwig wrote: > > +#define SBI_EXT_LEGACY_SET_TIMER 0x0 > > +#define SBI_EXT_LEGACY_CONSOLE_PUTCHAR 0x1 > > +#define SBI_EXT_LEGACY_CONSOLE_GETCHAR 0x2 > > +#define SBI_EXT_LEGACY_CLEAR_IPI 0x3 > > +#define SBI_EXT_LEGACY_SEND_IPI 0x4 > > +#define SBI_EXT_LEGACY_REMOTE_FENCE_I 0x5 > > +#define SBI_EXT_LEGACY_REMOTE_SFENCE_VMA 0x6 > > +#define SBI_EXT_LEGACY_REMOTE_SFENCE_VMA_ASID 0x7 > > +#define SBI_EXT_LEGACY_SHUTDOWN 0x8 > > As Mike said legacy is a bit of a weird name. I think this should > be SBI01_* or so. And pleae align the numeric values and maybe use > an enum. > Will do. > > + > > +#define SBI_CALL_LEGACY(which, arg0, arg1, arg2, arg3) > > ({ \ > > register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0); \ > > register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1); \ > > register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2); \ > > Instead of the weird inline assembly with forced register allocation, > why not move this to pure assembly? AFAICs this is the whole > assembly > code we'd need: > > ENTRY(sbi01_call) > ecall > END(sbi01_call) > That would split the implementation between C file & assembly file for no good reason. How about moving everything in sbi.c and just write everything inline assembly there. > > /* Lazy implementations until SBI is finalized */ > > -#define SBI_CALL_0(which) SBI_CALL(which, 0, 0, 0, 0) > > -#define SBI_CALL_1(which, arg0) SBI_CALL(which, arg0, 0, 0, 0) > > -#define SBI_CALL_2(which, arg0, arg1) SBI_CALL(which, arg0, arg1, > > 0, 0) > > -#define SBI_CALL_3(which, arg0, arg1, arg2) \ > > - SBI_CALL(which, arg0, arg1, arg2, 0) > > -#define SBI_CALL_4(which, arg0, arg1, arg2, arg3) \ > > - SBI_CALL(which, arg0, arg1, arg2, arg3) > > +#define SBI_CALL_LEGACY_0(which) SBI_CALL_LEGACY(which, 0, 0, 0, > > 0) > > +#define SBI_CALL_LEGACY_1(which, arg0) SBI_CALL_LEGACY(which, > > arg0, 0, 0, 0) > > +#define SBI_CALL_LEGACY_2(which, arg0, arg1) \ > > + SBI_CALL_LEGACY(which, arg0, arg1, 0, 0) > > +#define SBI_CALL_LEGACY_3(which, arg0, arg1, arg2) \ > > + SBI_CALL_LEGACY(which, arg0, arg1, arg2, 0) > > +#define SBI_CALL_LEGACY_4(which, arg0, arg1, arg2, arg3) \ > > + SBI_CALL_LEGACY(which, arg0, arg1, arg2, arg3) > > When you touch this anyway I'd suggest you kill these rather > pointless wrappers as well as the comment above them. Sure. I did not want make bigger chagnes in 1st RFC patches. But looking at the comments, I feel it was not a good decission. I will get rid of these wrappers and move necessary ones to sbi.c -- Regards, Atish _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv