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[70.228.75.190]) by smtp.gmail.com with ESMTPSA id i26sm5739249oou.27.2022.02.22.14.38.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Feb 2022 14:38:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=CMLA9XmhgLmnrkJsSU7Hf5KvpAaSmmAL50O+rMZoAIk=; b=Esplp2JEBoi/M9Je+p3QbS5+zMCULPlcJGio/hN0G+ivPqAtAjSZbS4SXBkZ2zVQfX Eh/psQEuF3x7UoeJLJRCazCx31dAeh8b9OfD9fnzHOEhs/zmkUdImziHPikgdKaoowlM q9lx87JZNOabIzZeTQsZ4QLLr3r5UIC4npaLkSzyQkesPGFkmgOS//Vv4sOQKCc8JIbe +cFyDrGr8grs3Kvkycen1NAr2B86774Nt9gOSW0zWxvFUE5CKArpdTbvY9Gtm8cxdYFy +ts4MvMW/i+UZHPIk28WCOxnMpJ+c0puU0Yqmoh9prF/mtxr7Esn86FvFLUgPcvSjXq6 72cA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=CMLA9XmhgLmnrkJsSU7Hf5KvpAaSmmAL50O+rMZoAIk=; b=qiW7lw/3qtN6ijte0bAscI2XXGMsMTzLBJcFZ36ly2IToYGTV1MvLUhVjt+dNdEHVm Bq3gQY07fOXH2W+YSyl/ojlnVLk7vQpq+bk3YmPNFydjKXn5T168L11kk8ivjARD27uV RGiZTDJl2BUcJUIeXW0JrvUGNnsGlcJao6zWrUJzD4e30dhOFxJSm+UsMtZqpw9VR1az xRgmtvTll9lCoX8irnlcgmW9fJEnikPxywFn5UeZYiKxKOpPoYnxxsmd4QgYEuNDhr2t 1cOYsnIPhLLrrNO25QPwtaeF0qV/9dJf0S5JOg2yLD7MAlSqAtucXmMsONbAelKqwlr2 s2Xw== X-Gm-Message-State: AOAM530BnAqciewYgXpCmzXRzaeoEQDmfex+LUYy76pOGM1C7FptwGFX RC+UVE5oV1N7/Kntl6B/t9RWcJMxEhJyaw== X-Google-Smtp-Source: ABdhPJz2gKUiYfTKgfLp4heybsrWR39pL9STFr7mVTMHyOkQJ2wsNnyerdlIpupU2L6QHbx5wHe4Hg== X-Received: by 2002:a05:6808:14c9:b0:2d5:166:5937 with SMTP id f9-20020a05680814c900b002d501665937mr3223736oiw.122.1645569535447; Tue, 22 Feb 2022 14:38:55 -0800 (PST) From: Atish Patra To: qemu-devel@nongnu.org Subject: [PATCH v3] target/riscv: Add isa extenstion strings to the device tree Date: Tue, 22 Feb 2022 14:38:30 -0800 Message-Id: <20220222223830.2319856-1-atishp@rivosinc.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::233 (failed) Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::233; envelope-from=atishp@rivosinc.com; helo=mail-oi1-x233.google.com X-Spam_score_int: -4 X-Spam_score: -0.5 X-Spam_bar: / X-Spam_report: (-0.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-riscv@nongnu.org, Heiko Stubner , Bin Meng , Atish Patra , Alistair Francis , Palmer Dabbelt Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1645569727837100001 Content-Type: text/plain; charset="utf-8" The Linux kernel parses the ISA extensions from "riscv,isa" DT property. It used to parse only the single letter base extensions until now. A generic ISA extension parsing framework was proposed[1] recently that can parse multi-letter ISA extensions as well. Generate the extended ISA string by appending the available ISA extensions to the "riscv,isa" string if it is enabled so that kernel can process it. [1] https://lkml.org/lkml/2022/2/15/263 Suggested-by: Heiko Stubner Signed-off-by: Atish Patra Reviewed-by: Alistair Francis Reviewed-by: Anup Patel --- Changes from v2->v3: 1. Used g_strconcat to replace snprintf & a max isa string length as suggested by Anup. 2. I have not included the Tested-by Tag from Heiko because the implementation changed from v2 to v3. Changes from v1->v2: 1. Improved the code redability by using arrays instead of individual check --- target/riscv/cpu.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index b0a40b83e7a8..2c7ff6ef555a 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -34,6 +34,12 @@ =20 /* RISC-V CPU definitions */ =20 +/* This includes the null terminated character '\0' */ +struct isa_ext_data { + const char *name; + bool enabled; +}; + static const char riscv_exts[26] =3D "IEMAFDQCLBJTPVNSUHKORWXYZG"; =20 const char * const riscv_int_regnames[] =3D { @@ -881,6 +887,28 @@ static void riscv_cpu_class_init(ObjectClass *c, void = *data) device_class_set_props(dc, riscv_cpu_properties); } =20 +static void riscv_isa_string_ext(RISCVCPU *cpu, char **isa_str, int max_st= r_len) +{ + char *old =3D *isa_str; + char *new =3D *isa_str; + int i; + struct isa_ext_data isa_edata_arr[] =3D { + { "svpbmt", cpu->cfg.ext_svpbmt }, + { "svinval", cpu->cfg.ext_svinval }, + { "svnapot", cpu->cfg.ext_svnapot }, + }; + + for (i =3D 0; i < ARRAY_SIZE(isa_edata_arr); i++) { + if (isa_edata_arr[i].enabled) { + new =3D g_strconcat(old, "_", isa_edata_arr[i].name, NULL); + g_free(old); + old =3D new; + } + } + + *isa_str =3D new; +} + char *riscv_isa_string(RISCVCPU *cpu) { int i; @@ -893,6 +921,7 @@ char *riscv_isa_string(RISCVCPU *cpu) } } *p =3D '\0'; + riscv_isa_string_ext(cpu, &isa_str, maxlen); return isa_str; } =20 --=20 2.30.2