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[2001:1ae9:1c2:4c00:20f:c6b4:1e57:7965]) by smtp.gmail.com with ESMTPSA id j20-20020a170906095400b00992e14af9b9sm8176963ejd.134.2023.08.09.09.58.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Aug 2023 09:58:16 -0700 (PDT) Date: Wed, 9 Aug 2023 18:58:15 +0200 From: Andrew Jones To: Evan Green Cc: linux-riscv@lists.infradead.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, conor.dooley@microchip.com, apatel@ventanamicro.com Subject: Re: [PATCH 2/6] RISC-V: Enable cbo.zero in usermode Message-ID: <20230809-7aa41e2dd2fd2909f1266a20@orel> References: <20230809115516.214537-8-ajones@ventanamicro.com> <20230809115516.214537-10-ajones@ventanamicro.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230809_095819_855692_57C0948D X-CRM114-Status: GOOD ( 19.37 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gV2VkLCBBdWcgMDksIDIwMjMgYXQgMDk6MDA6MzVBTSAtMDcwMCwgRXZhbiBHcmVlbiB3cm90 ZToKPiBPbiBXZWQsIEF1ZyA5LCAyMDIzIGF0IDQ6NTXigK9BTSBBbmRyZXcgSm9uZXMgPGFqb25l c0B2ZW50YW5hbWljcm8uY29tPiB3cm90ZToKLi4uCj4gPiArc3RhdGljIF9fYWx3YXlzX2lubGlu ZSBib29sIHJpc2N2X3RoaXNfY3B1X2hhc19leHRlbnNpb25fbGlrZWx5KGNvbnN0IHVuc2lnbmVk IGxvbmcgZXh0KQo+ID4gK3sKPiA+ICsgICAgICAgaWYgKElTX0VOQUJMRUQoQ09ORklHX1JJU0NW X0FMVEVSTkFUSVZFKSAmJiByaXNjdl9oYXNfZXh0ZW5zaW9uX2xpa2VseShleHQpKQo+ID4gKyAg ICAgICAgICAgICAgIHJldHVybiB0cnVlOwo+ID4gKwo+ID4gKyAgICAgICByZXR1cm4gX19yaXNj dl9pc2FfZXh0ZW5zaW9uX2F2YWlsYWJsZShoYXJ0X2lzYVtzbXBfcHJvY2Vzc29yX2lkKCldLmlz YSwgZXh0KTsKPiA+ICt9Cj4gPiArCj4gPiArc3RhdGljIF9fYWx3YXlzX2lubGluZSBib29sIHJp c2N2X3RoaXNfY3B1X2hhc19leHRlbnNpb25fdW5saWtlbHkoY29uc3QgdW5zaWduZWQgbG9uZyBl eHQpCj4gPiArewo+ID4gKyAgICAgICBpZiAoSVNfRU5BQkxFRChDT05GSUdfUklTQ1ZfQUxURVJO QVRJVkUpICYmIHJpc2N2X2hhc19leHRlbnNpb25fdW5saWtlbHkoZXh0KSkKPiA+ICsgICAgICAg ICAgICAgICByZXR1cm4gdHJ1ZTsKPiA+ICsKPiA+ICsgICAgICAgcmV0dXJuIF9fcmlzY3ZfaXNh X2V4dGVuc2lvbl9hdmFpbGFibGUoaGFydF9pc2Fbc21wX3Byb2Nlc3Nvcl9pZCgpXS5pc2EsIGV4 dCk7Cj4gPiArfQo+IAo+IEFub3RoZXIgd2F5IHRvIGRvIHRoaXMgd291bGQgYmUgdG8gYWRkIGEg cGFyYW1ldGVyIHRvCj4gcmlzY3ZfaGFzX2V4dGVuc2lvbl8qKCkgKGFzIHRoZXJlIGFyZSB2ZXJ5 IGZldyB1c2VycyksIHRoZW4gdGhlc2UgbmV3Cj4gZnVuY3Rpb25zIGNhbiB0dXJuIGFyb3VuZCBh bmQgY2FsbCB0aG9zZSB3aXRoIHRoZSBuZXcgcGFyYW1ldGVyIHNldCB0bwo+IGhhcnRfaXNhW3Nt cF9wcm9jZXNzb3JfaWQoKV0uaXNhLiBJdCdzIGEgdG9zc3VwLCBzbyB1cCB0byB5b3UuIFRoZQo+ IG9ubHkgYWR2YW50YWdlIHRvIGl0IEkgY2FuIGFyZ3VlIGlzIGl0IGtlZXBzIHRoZSBjb2RlIGZs b3dzIG1vcmUKPiB1bmlmaWVkLgo+CgpJIGxpa2UgdW5pZmljYXRpb24sIGJ1dCBJIHRoaW5rIEkn ZCBwcmVmZXIgd2UgY3JlYXRlIHdyYXBwZXJzIGFuZAp0cnkgdG8gYXZvaWQgY2FsbGVycyBuZWVk aW5nIHRvIGNvbnN0cnVjdCBoYXJ0X2lzYVtdLmlzYSBwYXJhbWV0ZXJzCnRoZW1zZWx2ZXMuIEkn bSBhbHNvIG5vdCBhIGJpZyBmYW4gb2YgdGhlIE5VTEwgcGFyYW1ldGVyIG5lZWRlZCB3aGVuCnJp c2N2X2lzYV9leHRlbnNpb25fYXZhaWxhYmxlKCkgaXMgaW52b2tlZCBmb3IgdGhlIHJpc2N2X2lz YSBiaXRtYXAuClNvIHdlIG5lZWQ6CgogIDEuIGNoZWNrIGlmIGFuIGV4dGVuc2lvbiBpcyBpbiBy aXNjdl9pc2EKICAyLiBjaGVjayBpZiBhbiBleHRlbnNpb24gaXMgaW4gYSBiaXRtYXAgcHJvdmlk ZWQgYnkgdGhlIGNhbGxlcgogIDMuIGNoZWNrIGlmIGFuIGV4dGVuc2lvbiBpcyBpbiB0aGlzIGNw dSdzIGlzYSBiaXRtYXAKICA0LiBjaGVjayBpZiBhbiBleHRlbnNpb24gaXMgaW4gdGhlIGlzYSBi aXRtYXAgb2YgYSBjcHUgcHJvdmlkZWQgYnkgdGhlCiAgICAgY2FsbGVyCgpUaGUgb25seSBvbmUg d2UgY2FuIG9wdGltaXplIHdpdGggYWx0ZXJuYXRpdmVzIGlzICgxKSwgc28gaXQgZGVmaW5pdGVs eQpnZXRzIHdyYXBwZXJzIChyaXNjdl9oYXNfZXh0ZW5zaW9uX2xpa2VseS91bmxpa2VseSgpKS4g KDMpIGFuZCAoNCkgY2FuCmFsc28gZ2V0IHdyYXBwZXJzIHdoaWNoIGZpcnN0IHRyeSB0aGUgb3B0 aW1pemVkICgxKSwgbGlrZSBJIGhhdmUgYWJvdmUuCkFjdHVhbGx5ICgzKSdzIHdyYXBwZXIgY291 bGQgYmUgYmFzZWQgb24gKDQpJ3MsIG9yIG9ubHkgcHJvdmlkZSB3cmFwcGVycwpmb3IgKDQpCgog c3RhdGljIF9fYWx3YXlzX2lubGluZSBib29sIHJpc2N2X2NwdV9oYXNfZXh0ZW5zaW9uX2xpa2Vs eShpbnQgY3B1LCBjb25zdCB1bnNpZ25lZCBsb25nIGV4dCkKIHsKICAgICBpZiAoSVNfRU5BQkxF RChDT05GSUdfUklTQ1ZfQUxURVJOQVRJVkUpICYmIHJpc2N2X2hhc19leHRlbnNpb25fbGlrZWx5 KGV4dCkpCiAgICAgICAgIHJldHVybiB0cnVlOwoKICAgICByZXR1cm4gX19yaXNjdl9pc2FfZXh0 ZW5zaW9uX2F2YWlsYWJsZShoYXJ0X2lzYVtjcHVdLmlzYSwgZXh0KTsKIH0KCiBzdGF0aWMgX19h bHdheXNfaW5saW5lIGJvb2wgcmlzY3ZfY3B1X2hhc19leHRlbnNpb25fdW5saWtlbHkoaW50IGNw dSwgY29uc3QgdW5zaWduZWQgbG9uZyBleHQpCiB7CiAgICAgaWYgKElTX0VOQUJMRUQoQ09ORklH X1JJU0NWX0FMVEVSTkFUSVZFKSAmJiByaXNjdl9oYXNfZXh0ZW5zaW9uX3VubGlrZWx5KGV4dCkp CiAgICAgICAgIHJldHVybiB0cnVlOwoKICAgICByZXR1cm4gX19yaXNjdl9pc2FfZXh0ZW5zaW9u X2F2YWlsYWJsZShoYXJ0X2lzYVtjcHVdLmlzYSwgZXh0KTsKIH0KCmFuZCB0aGVuIHVzZSBzbXBf cHJvY2Vzc29yX2lkKCkgZGlyZWN0bHkgaW4gdGhlIGNhbGxlcnMgdGhhdCBuZWVkCnRvIGNoZWNr IHRoaXNfY3B1J3MgZXh0ZW5zaW9ucy4KCkZvciBjYXNlICgyKSwgSSdkIGFkdm9jYXRlIHdlIHJl bmFtZSBfX3Jpc2N2X2lzYV9leHRlbnNpb25fYXZhaWxhYmxlKCkgdG8KcmlzY3ZfaGFzX2V4dGVu c2lvbigpIGFuZCBkcm9wIHRoZSByaXNjdl9pc2FfZXh0ZW5zaW9uX2F2YWlsYWJsZSgpIG1hY3Jv CmluIG9yZGVyIHRvIGF2b2lkIGhhdmluZyBzb21lIGNhbGxzIHdpdGggUklTQ1ZfSVNBX0VYVF8q IHNwZWxsZWQgb3V0IGFuZApvdGhlcnMgdGhhdCByZWx5IG9uIHRoZSBwYXN0aW5nLiBBbmQsIGlk ZWFsbHksIHdlJ2QgY29udmVydCBtb3N0CnJpc2N2X2hhc19leHRlbnNpb24oTlVMTCwgZXh0KSBj YWxscyB0byByaXNjdl9oYXNfZXh0ZW5zaW9uX1t1bl1saWtlbHkoKS4KClRoYW5rcywKZHJldwoK X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtcmlz Y3YgbWFpbGluZyBsaXN0CmxpbnV4LXJpc2N2QGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xp c3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1yaXNjdgo=