From patchwork Thu Oct 10 06:35:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: gaosong X-Patchwork-Id: 13829589 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 68219CF07B5 for ; Thu, 10 Oct 2024 06:54:40 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1syn32-00018I-Az; Thu, 10 Oct 2024 02:53:20 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1syn2z-00017Y-45 for qemu-devel@nongnu.org; Thu, 10 Oct 2024 02:53:17 -0400 Received: from mail.loongson.cn ([114.242.206.163]) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1syn2w-00040c-0f for qemu-devel@nongnu.org; Thu, 10 Oct 2024 02:53:16 -0400 Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8BxnnPWeQdn9+IRAA--.26015S3; Thu, 10 Oct 2024 14:53:10 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by front1 (Coremail) with SMTP id qMiowMBxXuTTeQdnBiAiAA--.41709S7; Thu, 10 Oct 2024 14:53:09 +0800 (CST) From: Song Gao To: qemu-devel@nongnu.org Cc: richard.henderson@linaro.org, maobibo@loongson.cn, philmd@linaro.org Subject: [PATCH v2 5/5] target/loongarch/tcg: Add hardware page table walker support Date: Thu, 10 Oct 2024 14:35:36 +0800 Message-Id: <20241010063536.2276871-6-gaosong@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20241010063536.2276871-1-gaosong@loongson.cn> References: <20241010063536.2276871-1-gaosong@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: qMiowMBxXuTTeQdnBiAiAA--.41709S7 X-CM-SenderInfo: 5jdr20tqj6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Received-SPF: pass client-ip=114.242.206.163; envelope-from=gaosong@loongson.cn; helo=mail.loongson.cn X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add hardware page table walker (HPTW) feature for la664. Set CPUCFG2.HPTW = 1 to indicate that HPTW is implemented on this CPU. Set PWCH.HPTW_EN = 1 to enable HPTW. Signed-off-by: Song Gao --- target/loongarch/cpu-csr.h | 3 + target/loongarch/cpu.c | 1 + target/loongarch/cpu.h | 1 + target/loongarch/cpu_helper.c | 26 +++++- target/loongarch/internals.h | 4 +- target/loongarch/tcg/tlb_helper.c | 147 +++++++++++++++++++++++++++++- 6 files changed, 176 insertions(+), 6 deletions(-) diff --git a/target/loongarch/cpu-csr.h b/target/loongarch/cpu-csr.h index 0834e91f30..1aa015dc44 100644 --- a/target/loongarch/cpu-csr.h +++ b/target/loongarch/cpu-csr.h @@ -68,6 +68,8 @@ FIELD(TLBENTRY, PLV, 2, 2) FIELD(TLBENTRY, MAT, 4, 2) FIELD(TLBENTRY, G, 6, 1) FIELD(TLBENTRY, HUGE, 6, 1) +FIELD(TLBENTRY, PRESENT, 7, 1) +FIELD(TLBENTRY, WRITE, 8, 1) FIELD(TLBENTRY, HGLOBAL, 12, 1) FIELD(TLBENTRY, LEVEL, 13, 2) FIELD(TLBENTRY_32, PPN, 8, 24) @@ -103,6 +105,7 @@ FIELD(CSR_PWCH, DIR3_BASE, 0, 6) FIELD(CSR_PWCH, DIR3_WIDTH, 6, 6) FIELD(CSR_PWCH, DIR4_BASE, 12, 6) FIELD(CSR_PWCH, DIR4_WIDTH, 18, 6) +FIELD(CSR_PWCH, HPTW_EN, 24, 1) #define LOONGARCH_CSR_STLBPS 0x1e /* Stlb page size */ FIELD(CSR_STLBPS, PS, 0, 5) diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c index d55b4110a9..9dbf2ce67b 100644 --- a/target/loongarch/cpu.c +++ b/target/loongarch/cpu.c @@ -476,6 +476,7 @@ static void loongarch_la664_initfn(Object *obj) env->cpucfg[0] = 0x14d000; /* PRID */ loongarch_common_initfn(env, obj); + env->cpucfg[2] = FIELD_DP32(env->cpucfg[2], CPUCFG2, HPTW, 1); } static void loongarch_la464_initfn(Object *obj) diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h index 6c41fafb70..84f92507d6 100644 --- a/target/loongarch/cpu.h +++ b/target/loongarch/cpu.h @@ -155,6 +155,7 @@ FIELD(CPUCFG2, LBT_ARM, 19, 1) FIELD(CPUCFG2, LBT_MIPS, 20, 1) FIELD(CPUCFG2, LSPW, 21, 1) FIELD(CPUCFG2, LAM, 22, 1) +FIELD(CPUCFG2, HPTW, 24, 1) /* cpucfg[3] bits */ FIELD(CPUCFG3, CCDMA, 0, 1) diff --git a/target/loongarch/cpu_helper.c b/target/loongarch/cpu_helper.c index 580362ac3e..35c95e9a27 100644 --- a/target/loongarch/cpu_helper.c +++ b/target/loongarch/cpu_helper.c @@ -178,10 +178,11 @@ static hwaddr dmw_va2pa(CPULoongArchState *env, target_ulong va, int get_physical_address(CPULoongArchState *env, hwaddr *physical, int *prot, target_ulong address, - MMUAccessType access_type, int mmu_idx) + MMUAccessType access_type, int mmu_idx, bool is_debug) { int user_mode = mmu_idx == MMU_USER_IDX; int kernel_mode = mmu_idx == MMU_KERNEL_IDX; + int ret; uint32_t plv, base_c, base_v; int64_t addr_high; uint8_t da = FIELD_EX64(env->CSR_CRMD, CSR_CRMD, DA); @@ -221,8 +222,25 @@ int get_physical_address(CPULoongArchState *env, hwaddr *physical, } /* Mapped address */ - return loongarch_map_address(env, physical, prot, address, - access_type, mmu_idx); + ret = loongarch_map_address(env, physical, prot, address, + access_type, mmu_idx); +#ifdef CONFIG_TCG + if (!FIELD_EX32(env->cpucfg[2], CPUCFG2, HPTW)) { + return ret; + } + + if (!FIELD_EX32(env->CSR_PWCH, CSR_PWCH, HPTW_EN)) { + return ret; + } + + if (do_page_walk(env, address, access_type, ret, physical, is_debug)) { + if (!is_debug) { + ret = loongarch_map_address(env, physical, prot, address, + access_type, mmu_idx); + } + } +#endif + return ret; } hwaddr loongarch_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) @@ -232,7 +250,7 @@ hwaddr loongarch_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) int prot; if (get_physical_address(env, &phys_addr, &prot, addr, MMU_DATA_LOAD, - cpu_mmu_index(cs, false)) != 0) { + cpu_mmu_index(cs, false), true) != 0) { return -1; } return phys_addr; diff --git a/target/loongarch/internals.h b/target/loongarch/internals.h index 1a02427627..fc8357914b 100644 --- a/target/loongarch/internals.h +++ b/target/loongarch/internals.h @@ -56,13 +56,15 @@ bool loongarch_tlb_search(CPULoongArchState *env, target_ulong vaddr, int *index); int get_physical_address(CPULoongArchState *env, hwaddr *physical, int *prot, target_ulong address, - MMUAccessType access_type, int mmu_idx); + MMUAccessType access_type, int mmu_idx, bool is_debug); hwaddr loongarch_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr); #ifdef CONFIG_TCG bool loongarch_cpu_tlb_fill(CPUState *cs, vaddr address, int size, MMUAccessType access_type, int mmu_idx, bool probe, uintptr_t retaddr); +bool do_page_walk(CPULoongArchState *env, vaddr address, + MMUAccessType, int tlb_error, hwaddr *physical, bool is_debug); #endif #endif /* !CONFIG_USER_ONLY */ diff --git a/target/loongarch/tcg/tlb_helper.c b/target/loongarch/tcg/tlb_helper.c index 463e9be7f2..cecffde56e 100644 --- a/target/loongarch/tcg/tlb_helper.c +++ b/target/loongarch/tcg/tlb_helper.c @@ -8,6 +8,7 @@ #include "qemu/osdep.h" #include "qemu/guest-random.h" +#include "qemu/atomic.h" #include "cpu.h" #include "internals.h" @@ -504,7 +505,7 @@ bool loongarch_cpu_tlb_fill(CPUState *cs, vaddr address, int size, /* Data access */ ret = get_physical_address(env, &physical, &prot, address, - access_type, mmu_idx); + access_type, mmu_idx, false); if (ret == TLBRET_MATCH) { tlb_set_page(cs, address & TARGET_PAGE_MASK, @@ -651,3 +652,147 @@ void helper_ldpte(CPULoongArchState *env, target_ulong base, target_ulong odd, } env->CSR_TLBREHI = FIELD_DP64(env->CSR_TLBREHI, CSR_TLBREHI, PS, ps); } + +static target_ulong get_pte_base(CPULoongArchState *env, vaddr address) +{ + uint64_t dir_base, dir_width; + target_ulong base; + int i; + + /* Get PGD */ + base = ((address >> 63) & 0x1) ? env->CSR_PGDH : env->CSR_PGDL; + + for (i = 4; i > 0; i--) { + get_dir_base_width(env, &dir_base, &dir_width, i); + /* + * LDDIR: level = 2 corresponds to Dir1 in PWCL. + * PWCL/PWCH: dir >= 1 && dir_width == 0 means no such level. + */ + if (i >= 2 && dir_width == 0) { + continue; + } + base = do_lddir(env, base, address, i); + } + + return base; +} + +bool do_page_walk(CPULoongArchState *env, vaddr address, + MMUAccessType access_type, int tlb_error, + hwaddr *physical, bool is_debug) +{ + CPUState *cs = env_cpu(env); + target_ulong base, ps, tmp0, tmp1, ptindex, ptoffset, cur_val, new_val, old_val; + uint64_t entrylo0, entrylo1, tlbehi, vppn; + uint64_t ptbase = FIELD_EX64(env->CSR_PWCL, CSR_PWCL, PTBASE); + uint64_t ptwidth = FIELD_EX64(env->CSR_PWCL, CSR_PWCL, PTWIDTH); + int index, shift; + bool ret = false; + + /* + * tlb error map : + * TLBRET_NOMATCH : tlb fill + * TLBRET_INVALID : access_type = 0/2 tlb_load + * : access_type = 1 tlb_store + * TLBRET_DIRTY : tlb_modify + */ + switch (tlb_error) { + case TLBRET_NOMATCH: + base = get_pte_base(env, address); + if (base == 0) { + return ret; + } + do_ldpte(env, base, address, &tmp0, &tmp1, &ps); + entrylo0 = tmp0; + entrylo1 = tmp1; + tlbehi = address & (TARGET_PAGE_MASK << 1); + vppn = FIELD_EX64(tlbehi, CSR_TLBEHI_64, VPPN); + if (is_debug) { + uint64_t tlb_ppn, tlb_entry; + uint8_t n; + n = (address >> ps) & 0x1;/* Odd or even */ + + tlb_entry = n ? entrylo1: entrylo1; + tlb_ppn = FIELD_EX64(tlb_entry, TLBENTRY_64, PPN); + /* Remove sw bit between bit12 -- bit PS */ + tlb_ppn = tlb_ppn & ~(((0x1UL << (ps - 12)) -1)); + *physical = (tlb_ppn << R_TLBENTRY_64_PPN_SHIFT) | + (address & MAKE_64BIT_MASK(0, ps)); + } else { + index = get_random_tlb_index(env, tlbehi, ps); + invalidate_tlb(env, index); + do_fill_tlb_entry(env, vppn, entrylo0, entrylo1, index, ps); + } + + ret = true; + break; + case TLBRET_DIRTY: + case TLBRET_INVALID: + base = get_pte_base(env, address); + + /* 0:64bit, 1:128bit, 2:192bit, 3:256bit */ + shift = FIELD_EX64(env->CSR_PWCL, CSR_PWCL, PTEWIDTH); + shift = (shift + 1) * 3; + ptindex = (address >> ptbase) & ((1 << ptwidth) -1); + ptoffset = ptindex << shift; + tmp0 = base | ptoffset; + retry: + old_val = ldq_phys(cs->as, tmp0) & TARGET_PHYS_MASK; + + if (old_val == 0) { + return ret; + } + + new_val = old_val; + /* Check pte val, and do tlb modify. */ + if ((tlb_error == TLBRET_INVALID) && + (access_type == MMU_INST_FETCH )) { + if (!(FIELD_EX64(new_val, TLBENTRY, PRESENT))) { + break; + } + new_val = FIELD_DP64(new_val, TLBENTRY, V, 1); + } else if ((tlb_error == TLBRET_INVALID) && + access_type == MMU_DATA_STORE) { + if (!((FIELD_EX64(new_val, TLBENTRY, PRESENT) && + (FIELD_EX64(new_val, TLBENTRY, WRITE))))){ + break; + } + new_val = FIELD_DP64(new_val, TLBENTRY, V, 1); + } else if (tlb_error == TLBRET_DIRTY) { + if (!(FIELD_EX64(new_val, TLBENTRY, PRESENT) && + (FIELD_EX64(new_val, TLBENTRY, WRITE)))) { + break; + } + new_val = FIELD_DP64(new_val, TLBENTRY, V, 1); + } + + if (old_val != new_val) { + cur_val = qatomic_cmpxchg((uint64_t *)tmp0, old_val, new_val); + if (cur_val == old_val) { + goto retry; + } + } + + tmp0 = tmp0 & (~0x8); + entrylo0 = ldq_phys(cs->as, tmp0) & TARGET_PHYS_MASK; + entrylo1 = ldq_phys(cs->as, tmp0 | 0x8) & TARGET_PHYS_MASK; + tlbehi = address & (TARGET_PAGE_MASK << 1); + ps = FIELD_EX64(env->CSR_PWCL, CSR_PWCL, PTBASE); + vppn = FIELD_EX64(tlbehi, CSR_TLBEHI_64, VPPN); + + /* + * srch tlb index with tlb entryhi + * if no match, we use get_random_tlb_index() to get random index. + */ + if (!loongarch_tlb_search(env, tlbehi, &index)) { + index = get_random_tlb_index(env, tlbehi, ps); + } + invalidate_tlb(env, index); + do_fill_tlb_entry(env, vppn, entrylo0, entrylo1, index, ps); + ret = true; + break; + default: + ; + } + return ret; +}