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Mon, 29 Jan 2024 08:00:16 +0000 From: Sia Jee Heng To: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Cc: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, sudeep.holla@arm.com, jeeheng.sia@starfivetech.com, robh@kernel.org, conor.dooley@microchip.com, suagrfillet@gmail.com Subject: [RFC v1 1/2] riscv: cacheinfo: Remove unused parameter Date: Sun, 28 Jan 2024 23:59:56 -0800 Message-Id: <20240129075957.116033-2-jeeheng.sia@starfivetech.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240129075957.116033-1-jeeheng.sia@starfivetech.com> References: <20240129075957.116033-1-jeeheng.sia@starfivetech.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: NT0PR01CA0031.CHNPR01.prod.partner.outlook.cn (2406:e500:c510:c::14) To BJSPR01MB0561.CHNPR01.prod.partner.outlook.cn (2406:e500:c211:f::16) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BJSPR01MB0561:EE_|BJSPR01MB0545:EE_ X-MS-Office365-Filtering-Correlation-Id: 048c09d5-343a-4e89-2980-08dc20a0540f X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; 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charset="utf-8" Removing the unused parameter in ci_leaf_init() to simplify the code. Signed-off-by: Sia Jee Heng --- arch/riscv/kernel/cacheinfo.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/arch/riscv/kernel/cacheinfo.c b/arch/riscv/kernel/cacheinfo.c index 09e9b88110d1..30a6878287ad 100644 --- a/arch/riscv/kernel/cacheinfo.c +++ b/arch/riscv/kernel/cacheinfo.c @@ -64,7 +64,6 @@ uintptr_t get_cache_geometry(u32 level, enum cache_type t= ype) } =20 static void ci_leaf_init(struct cacheinfo *this_leaf, - struct device_node *node, enum cache_type type, unsigned int level) { this_leaf->level =3D level; @@ -80,11 +79,11 @@ int populate_cache_leaves(unsigned int cpu) int levels =3D 1, level =3D 1; =20 if (of_property_read_bool(np, "cache-size")) - ci_leaf_init(this_leaf++, np, CACHE_TYPE_UNIFIED, level); + ci_leaf_init(this_leaf++, CACHE_TYPE_UNIFIED, level); if (of_property_read_bool(np, "i-cache-size")) - ci_leaf_init(this_leaf++, np, CACHE_TYPE_INST, level); + ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level); if (of_property_read_bool(np, "d-cache-size")) - ci_leaf_init(this_leaf++, np, CACHE_TYPE_DATA, level); 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charset="utf-8" Refactoring the cache population function to support both DT and ACPI-based platforms. Signed-off-by: Sia Jee Heng --- arch/riscv/kernel/cacheinfo.c | 47 ++++++++++++++--------------------- 1 file changed, 19 insertions(+), 28 deletions(-) diff --git a/arch/riscv/kernel/cacheinfo.c b/arch/riscv/kernel/cacheinfo.c index 30a6878287ad..f10e26fb75b6 100644 --- a/arch/riscv/kernel/cacheinfo.c +++ b/arch/riscv/kernel/cacheinfo.c @@ -74,36 +74,27 @@ int populate_cache_leaves(unsigned int cpu) { struct cpu_cacheinfo *this_cpu_ci =3D get_cpu_cacheinfo(cpu); struct cacheinfo *this_leaf =3D this_cpu_ci->info_list; - struct device_node *np =3D of_cpu_device_node_get(cpu); - struct device_node *prev =3D NULL; - int levels =3D 1, level =3D 1; - - if (of_property_read_bool(np, "cache-size")) - ci_leaf_init(this_leaf++, CACHE_TYPE_UNIFIED, level); - if (of_property_read_bool(np, "i-cache-size")) - ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level); - if (of_property_read_bool(np, "d-cache-size")) - ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level); - - prev =3D np; - while ((np =3D of_find_next_cache_node(np))) { - of_node_put(prev); - prev =3D np; - if (!of_device_is_compatible(np, "cache")) - break; - if (of_property_read_u32(np, "cache-level", &level)) - break; - if (level <=3D levels) - break; - if (of_property_read_bool(np, "cache-size")) - ci_leaf_init(this_leaf++, CACHE_TYPE_UNIFIED, level); - if (of_property_read_bool(np, "i-cache-size")) - ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level); - if (of_property_read_bool(np, "d-cache-size")) + unsigned int level, idx; + + for (idx =3D 0, level =3D 1; level <=3D this_cpu_ci->num_levels && + idx < this_cpu_ci->num_leaves; idx++, level++) { + /* + * Since the RISC-V architecture doesn't provide any register for detect= ing the + * Cache Level and Cache type, this assumes that: + * - There cannot be any split caches (data/instruction) above a unified= cache. + * - Data/instruction caches come in pairs. + * - Significant work is required elsewhere to fully support data/instru= ction-only + * type caches. + * - The above assumptions are based on conventional system design and k= nown + * examples. + */ + if (level =3D=3D 1) { ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level); - levels =3D level; + ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level); + } else { + ci_leaf_init(this_leaf++, CACHE_TYPE_UNIFIED, level); + } } - of_node_put(np); =20 return 0; } --=20 2.34.1