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[2001:1ae9:1c2:4c00:20f:c6b4:1e57:7965]) by smtp.gmail.com with ESMTPSA id rl6-20020a170907216600b009937dbabbdasm3900308ejb.217.2023.07.13.05.45.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Jul 2023 05:45:58 -0700 (PDT) Date: Thu, 13 Jul 2023 14:45:57 +0200 From: Andrew Jones To: Conor Dooley Cc: Evan Green , Samuel Ortiz , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org, "Hongren (Zenithal) Zheng" , linux@rivosinc.com, Heiko Stuebner , Anup Patel , linux-kernel@vger.kernel.org, Guo Ren , Atish Patra , =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , devicetree@vger.kernel.org, sorear@fastmail.com, Jiatai He Subject: Re: [PATCH v4 1/4] RISC-V: Add Bitmanip/Scalar Crypto parsing from DT Message-ID: <20230713-692c967c7a08c15dacbcab10@orel> References: <20230712084134.1648008-1-sameo@rivosinc.com> <20230712084134.1648008-2-sameo@rivosinc.com> <20230712-bulldozer-affected-199042dc3afd@wendy> <20230713-3f574332a06678f908cee21e@orel> <20230713-aggregate-uncut-e16ee9270b14@wendy> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230713-aggregate-uncut-e16ee9270b14@wendy> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230713_054601_269350_978BAB35 X-CRM114-Status: GOOD ( 62.54 ) 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 T24gVGh1LCBKdWwgMTMsIDIwMjMgYXQgMTI6Mjc6MjRQTSArMDEwMCwgQ29ub3IgRG9vbGV5IHdy b3RlOgo+IE9uIFRodSwgSnVsIDEzLCAyMDIzIGF0IDEwOjQ2OjE0QU0gKzAyMDAsIEFuZHJldyBK b25lcyB3cm90ZToKPiA+IE9uIFdlZCwgSnVsIDEyLCAyMDIzIGF0IDEwOjQzOjMzQU0gLTA3MDAs IEV2YW4gR3JlZW4gd3JvdGU6Cj4gPiA+IE9uIFdlZCwgSnVsIDEyLCAyMDIzIGF0IDM6MznigK9B 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[2001:1ae9:1c2:4c00:20f:c6b4:1e57:7965]) by smtp.gmail.com with ESMTPSA id rl6-20020a170907216600b009937dbabbdasm3900308ejb.217.2023.07.13.05.45.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Jul 2023 05:45:58 -0700 (PDT) Date: Thu, 13 Jul 2023 14:45:57 +0200 From: Andrew Jones To: Conor Dooley Cc: Evan Green , Samuel Ortiz , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org, "Hongren (Zenithal) Zheng" , linux@rivosinc.com, Heiko Stuebner , Anup Patel , linux-kernel@vger.kernel.org, Guo Ren , Atish Patra , =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , devicetree@vger.kernel.org, sorear@fastmail.com, Jiatai He Subject: Re: [PATCH v4 1/4] RISC-V: Add Bitmanip/Scalar Crypto parsing from DT Message-ID: <20230713-692c967c7a08c15dacbcab10@orel> References: <20230712084134.1648008-1-sameo@rivosinc.com> <20230712084134.1648008-2-sameo@rivosinc.com> <20230712-bulldozer-affected-199042dc3afd@wendy> <20230713-3f574332a06678f908cee21e@orel> <20230713-aggregate-uncut-e16ee9270b14@wendy> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20230713-aggregate-uncut-e16ee9270b14@wendy> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Thu, Jul 13, 2023 at 12:27:24PM +0100, Conor Dooley wrote: > On Thu, Jul 13, 2023 at 10:46:14AM +0200, Andrew Jones wrote: > > On Wed, Jul 12, 2023 at 10:43:33AM -0700, Evan Green wrote: > > > On Wed, Jul 12, 2023 at 3:39 AM Conor Dooley wrote: > > > > On Wed, Jul 12, 2023 at 10:41:17AM +0200, Samuel Ortiz wrote: > > > > > From: "Hongren (Zenithal) Zheng" > > > > > > > > > > Parse Zb/Zk related string from DT and output them to cpuinfo. > > > > > > > > One thing that has sprung to mind is that this is not limited to DT > > > > anymore, since the information could in theory come from ACPI too. > > > > Ditto the title I guess. > > > > > > > > > It is worth noting that the Scalar Crypto extension defines "zk" as a > > > > > shorthand for the Zkn, Zkr and Zkt extensions. Since the Zkn one also > > > > > implies the Zbkb, Zbkc and Zbkx extensions, simply passing the valid > > > > > "zk" extension name through a DT will enable all of the Zbkb, Zbkc, > > > > > Zbkx, Zkn, Zkr and Zkt extensions. > > > > > > > > > > Also, since there currently is no mechanism to merge all enabled > > > > > extensions, the generated cpuinfo output could be relatively large. > > > > > For example, setting the "riscv,isa" DT property to "rv64imafdc_zk_zks" > > > > > will generate the following cpuinfo output: > > > > > "rv64imafdc_zbkb_zbkc_zbkx_zknd_zkne_zknh_zkr_zksed_zksh_zkt". > > > > > > > > On that note, I've created another version of what checking for > > > > supersets could look like, since it'll be needed either by my series or > > > > this one, depending on what gets merged first. I've yet to test the > > > > dedicated extensions part of it, but I wanted to get this out before I > > > > went looking at other fixes in the area. > > > > > > > > Evan, since it was you that commented on this stuff last time around, > > > > could you take another look? I'm still not keen on the "subset_of" > > > > arrays, but they're an improvement on what I had last time around for > > > > sure. > > > > > > > > > > This looks alright to me. At the risk of getting into bikeshedding > > > territory, the only awkward bit of it is it composes the extensions in > > > sort of the opposite way you'd expect. I tend to think of Zks as being > > > comprised of {zbkb, zbkc, zksed, zksh}, > > > > This is also the way I think of it, so, FWIW, I prefer the approach below, > > where bundles are expanded. > > I took the patch Evan sent me off-list & have spun it into a "real" > patch. I did some minor changes (c99 loop, __init marking) to match what > the code was already doing and expanded it to work for the new property > stuff. > I'm not sure that match_isa_ext() needs to be a function, given the > single user - it might be better refactored to drop the outer if & return > whether a match was found. > If done that would allow sharing the same function between isa string and > dedicated property parsing. I left it intact for now. Might also be > worth adding kerneldoc for that struct. > > -- >8 -- > From 8300b98e487e57d192bc9581c6a3639c40c52623 Mon Sep 17 00:00:00 2001 > From: Evan Green > Date: Wed, 12 Jul 2023 10:36:15 -0700 > Subject: [PATCH] RISC-V: Add support Scalar Crypto using "bundled extensions" > > The Scalar Crypto specification defines Zk as a shorthand for the > Zkn, Zkr and Zkt extensions. The same follows for both Zkn, Zks and Zbk, > which are all shorthands for various other extensions. The detailed > breakdown can be found in their dt-binding entries. > > Since Zkn also implies the Zbkb, Zbkc and Zbkx extensions, simply passing > "zk" through a DT should enable all of Zbkb, Zbkc, Zbkx, Zkn, Zkr and Zkt. > For example, setting the "riscv,isa" DT property to "rv64imafdc_zk" > should generate the following cpuinfo output: > "rv64imafdc_zicntr_zicsr_zifencei_zihpm_zbkb_zbkc_zbkx_zknd_zkne_zknh_zkr_zkt" > > riscv_isa_ext_data grows a pair of new members, to permit setting the > relevant bits for "bundled" extensions, both while parsing the ISA string > and the new dedicated extension properties > > Co-developed-by: Conor Dooley > Signed-off-by: Conor Dooley > --- > There's basically none of the original patch left, so I have dropped the > co-developed-bys and signed-off-bys from before. It does need one from > you now though Evan! > --- > arch/riscv/include/asm/hwcap.h | 13 +++++ > arch/riscv/kernel/cpufeature.c | 94 ++++++++++++++++++++++++++++------ > 2 files changed, 92 insertions(+), 15 deletions(-) > > diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h > index b7b58258f6c7..f74308633e45 100644 > --- a/arch/riscv/include/asm/hwcap.h > +++ b/arch/riscv/include/asm/hwcap.h > @@ -58,6 +58,17 @@ > #define RISCV_ISA_EXT_ZICSR 40 > #define RISCV_ISA_EXT_ZIFENCEI 41 > #define RISCV_ISA_EXT_ZIHPM 42 > +#define RISCV_ISA_EXT_ZBC 43 > +#define RISCV_ISA_EXT_ZBKB 44 > +#define RISCV_ISA_EXT_ZBKC 45 > +#define RISCV_ISA_EXT_ZBKX 46 > +#define RISCV_ISA_EXT_ZKND 47 > +#define RISCV_ISA_EXT_ZKNE 48 > +#define RISCV_ISA_EXT_ZKNH 49 > +#define RISCV_ISA_EXT_ZKR 50 > +#define RISCV_ISA_EXT_ZKSED 51 > +#define RISCV_ISA_EXT_ZKSH 52 > +#define RISCV_ISA_EXT_ZKT 53 > > #define RISCV_ISA_EXT_MAX 64 > > @@ -77,6 +88,8 @@ struct riscv_isa_ext_data { > const unsigned int id; > const char *name; > const char *property; > + const unsigned int *bundle_ids; > + const unsigned int bundle_size; > }; > > extern const struct riscv_isa_ext_data riscv_isa_ext[]; > diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c > index ccbe27b3060b..d999d73554f0 100644 > --- a/arch/riscv/kernel/cpufeature.c > +++ b/arch/riscv/kernel/cpufeature.c > @@ -105,6 +105,39 @@ static bool riscv_isa_extension_check(int id) > .id = _id, \ > } > > +#define __RISCV_ISA_EXT_BUNDLE(_name, _bundled_exts) { \ > + .name = #_name, \ > + .property = #_name, \ > + .bundle_ids = _bundled_exts, \ > + .bundle_size = ARRAY_SIZE(_bundled_exts) \ > +} > + > +static const unsigned int riscv_zk_bundled_exts[] = { > + RISCV_ISA_EXT_ZBKB, > + RISCV_ISA_EXT_ZBKC, > + RISCV_ISA_EXT_ZBKX, > + RISCV_ISA_EXT_ZKND, > + RISCV_ISA_EXT_ZKNE, > + RISCV_ISA_EXT_ZKR, > + RISCV_ISA_EXT_ZKT, I think RISCV_ISA_EXT_ZKNH also belongs in this bundle, since the spec says zk is the zkn bundle plus zkr and zkt. > +}; > + > +static const unsigned int riscv_zkn_bundled_exts[] = { > + RISCV_ISA_EXT_ZBKB, > + RISCV_ISA_EXT_ZBKC, > + RISCV_ISA_EXT_ZBKX, > + RISCV_ISA_EXT_ZKND, > + RISCV_ISA_EXT_ZKNE, > + RISCV_ISA_EXT_ZKNH, > +}; > + > +static const unsigned int riscv_zks_bundled_exts[] = { > + RISCV_ISA_EXT_ZBKB, > + RISCV_ISA_EXT_ZBKC, > + RISCV_ISA_EXT_ZKSED, > + RISCV_ISA_EXT_ZKSH And, per the spec, this one appears to be missing RISCV_ISA_EXT_ZBKX. I found [1] which calls these shorthands "group names", so maybe we should use the term "group" instead of "bundle"? I'm tempted to try to directly code that graphic in [1] with something like... #define Zks_group1 \ RISCV_ISA_EXT_ZKSED, \ RISCV_ISA_EXT_ZKSH #define Zks_group2 \ RISCV_ISA_EXT_ZBKB, \ RISCV_ISA_EXT_ZBKC, \ RISCV_ISA_EXT_ZBKX #define Zks_group \ Zks_group1, \ Zks_group2 #define Zkn_group1 \ RISCV_ISA_EXT_ZKND, \ RISCV_ISA_EXT_ZKNE, \ RISCV_ISA_EXT_ZKNH #define Zkn_group2 \ Zks_group2 #define Zkn_group \ Zkn_group1, \ Zkn_group2 static const unsigned int riscv_zks_group[] = { Zks_group, }; static const unsigned int riscv_zkn_group[] = { Zkn_group, }; static const unsigned int riscv_zk_group[] = { Zks_group, Zkn_group, RISCV_ISA_EXT_ZKR, RISCV_ISA_EXT_ZKT, }; ...but now that I have, I'm not sure I like the looks of it... [1] https://wiki.riscv.org/display/HOME/Scalar+Cryptography+Instruction+Set+Extension+Group+Names+Diagram Thanks, drew > +}; > + > /* > * The canonical order of ISA extension names in the ISA string is defined in > * chapter 27 of the unprivileged specification. > @@ -167,7 +200,20 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = { > __RISCV_ISA_EXT_DATA(zihpm, RISCV_ISA_EXT_ZIHPM), > __RISCV_ISA_EXT_DATA(zba, RISCV_ISA_EXT_ZBA), > __RISCV_ISA_EXT_DATA(zbb, RISCV_ISA_EXT_ZBB), > + __RISCV_ISA_EXT_DATA(zbc, RISCV_ISA_EXT_ZBC), > + __RISCV_ISA_EXT_DATA(zbkb, RISCV_ISA_EXT_ZBKB), > + __RISCV_ISA_EXT_DATA(zbkc, RISCV_ISA_EXT_ZBKC), > + __RISCV_ISA_EXT_DATA(zbkx, RISCV_ISA_EXT_ZBKX), > __RISCV_ISA_EXT_DATA(zbs, RISCV_ISA_EXT_ZBS), > + __RISCV_ISA_EXT_BUNDLE(zk, riscv_zk_bundled_exts), > + __RISCV_ISA_EXT_BUNDLE(zkn, riscv_zkn_bundled_exts), > + __RISCV_ISA_EXT_DATA(zknd, RISCV_ISA_EXT_ZKND), > + __RISCV_ISA_EXT_DATA(zkne, RISCV_ISA_EXT_ZKNE), > + __RISCV_ISA_EXT_DATA(zknh, RISCV_ISA_EXT_ZKNH), > + __RISCV_ISA_EXT_DATA(zkr, RISCV_ISA_EXT_ZKR), > + __RISCV_ISA_EXT_BUNDLE(zks, riscv_zks_bundled_exts), > + __RISCV_ISA_EXT_DATA(zksed, RISCV_ISA_EXT_ZKSED), > + __RISCV_ISA_EXT_DATA(zksh, RISCV_ISA_EXT_ZKSH), > __RISCV_ISA_EXT_DATA(smaia, RISCV_ISA_EXT_SMAIA), > __RISCV_ISA_EXT_DATA(ssaia, RISCV_ISA_EXT_SSAIA), > __RISCV_ISA_EXT_DATA(sscofpmf, RISCV_ISA_EXT_SSCOFPMF), > @@ -179,6 +225,26 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = { > > const size_t riscv_isa_ext_count = ARRAY_SIZE(riscv_isa_ext); > > +static void inline __init match_isa_ext(const struct riscv_isa_ext_data *ext, const char *name, > + const char *name_end, struct riscv_isainfo *isainfo) > +{ > + if ((name_end - name == strlen(ext->name)) && > + !strncasecmp(name, ext->name, name_end - name)) { > + /* > + * If this is a bundle, enable all the ISA extensions that > + * comprise the bundle. > + */ > + if (ext->bundle_size) { > + for (int i = 0; i < ext->bundle_size; i++) { > + if (riscv_isa_extension_check(ext->bundle_ids[i])) > + set_bit(ext->bundle_ids[i], isainfo->isa); > + } > + } else if (riscv_isa_extension_check(ext->id)) { > + set_bit(ext->id, isainfo->isa); > + } > + } > +} > + > static void __init riscv_parse_isa_string(unsigned long *this_hwcap, struct riscv_isainfo *isainfo, > unsigned long *isa2hwcap, const char *isa) > { > @@ -310,14 +376,6 @@ static void __init riscv_parse_isa_string(unsigned long *this_hwcap, struct risc > if (*isa == '_') > ++isa; > > -#define SET_ISA_EXT_MAP(name, bit) \ > - do { \ > - if ((ext_end - ext == strlen(name)) && \ > - !strncasecmp(ext, name, strlen(name)) && \ > - riscv_isa_extension_check(bit)) \ > - set_bit(bit, isainfo->isa); \ > - } while (false) \ > - > if (unlikely(ext_err)) > continue; > if (!ext_long) { > @@ -329,10 +387,8 @@ static void __init riscv_parse_isa_string(unsigned long *this_hwcap, struct risc > } > } else { > for (int i = 0; i < riscv_isa_ext_count; i++) > - SET_ISA_EXT_MAP(riscv_isa_ext[i].name, > - riscv_isa_ext[i].id); > + match_isa_ext(&riscv_isa_ext[i], ext, ext_end, isainfo); > } > -#undef SET_ISA_EXT_MAP > } > } > > @@ -436,18 +492,26 @@ static int __init riscv_fill_hwcap_from_ext_list(unsigned long *isa2hwcap) > } > > for (int i = 0; i < riscv_isa_ext_count; i++) { > + const struct riscv_isa_ext_data ext = riscv_isa_ext[i]; > + > if (of_property_match_string(cpu_node, "riscv,isa-extensions", > - riscv_isa_ext[i].property) < 0) > + ext.property) < 0) > continue; > > - if (!riscv_isa_extension_check(riscv_isa_ext[i].id)) > + if (ext.bundle_size) { > + for (int j = 0; j < ext.bundle_size; j++) { > + if (riscv_isa_extension_check(ext.bundle_ids[i])) > + set_bit(ext.bundle_ids[j], this_isa); > + } > + } else if (riscv_isa_extension_check(ext.id)) { > + set_bit(ext.id, this_isa); > + } else { > continue; > + } > > /* Only single letter extensions get set in hwcap */ > if (strnlen(riscv_isa_ext[i].name, 2) == 1) > this_hwcap |= isa2hwcap[riscv_isa_ext[i].id]; > - > - set_bit(riscv_isa_ext[i].id, this_isa); > } > > of_node_put(cpu_node); > -- > 2.40.1 > >