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[PULL 02/22] target/riscv: implement Zicbom extension
From: |
Palmer Dabbelt |
Subject: |
[PULL 02/22] target/riscv: implement Zicbom extension |
Date: |
Mon, 6 Mar 2023 14:02:39 -0800 |
From: Christoph Muellner <cmuellner@linux.com>
Zicbom is the Cache-Block Management extension defined in the already
ratified RISC-V Base Cache Management Operation (CBO) ISA extension [1].
The extension contains three instructions: cbo.clean, cbo.flush and
cbo.inval. All of them must be implemented in the same group as LQ and
cbo.zero due to overlapping patterns.
All these instructions can throw a Illegal Instruction/Virtual
Instruction exception, similar to the existing cbo.zero. The same
check_zicbo_envcfg() is used to handle these exceptions.
Aside from that, these instructions also need to handle page faults and
guest page faults. This is done in a new check_zicbom_access() helper.
As with Zicboz, the cache block size for Zicbom is also configurable.
Note that the spec determines that Zicbo[mp] and Zicboz can have
different cache sizes (Section 2.7 of [1]), so we also include a
'cbom_blocksize' to go along with the existing 'cboz_blocksize'. They
are set to the same size, so unless users want to play around with the
settings both sizes will be the same.
[1]
https://github.com/riscv/riscv-CMOs/blob/master/specifications/cmobase-v1.0.1.pdf
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Weiwei Li <liweiwei@iscas.ac.cn>
Co-developed-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
Signed-off-by: Christoph Muellner <cmuellner@linux.com>
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20230224132536.552293-4-dbarboza@ventanamicro.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
---
target/riscv/cpu.c | 3 +
target/riscv/cpu.h | 2 +
target/riscv/helper.h | 2 +
target/riscv/insn32.decode | 5 ++
target/riscv/insn_trans/trans_rvzicbo.c.inc | 27 +++++++++
target/riscv/op_helper.c | 67 +++++++++++++++++++++
6 files changed, 106 insertions(+)
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index ab6c127859..3e8f21a47d 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -75,6 +75,7 @@ struct isa_ext_data {
static const struct isa_ext_data isa_edata_arr[] = {
ISA_EXT_DATA_ENTRY(h, false, PRIV_VERSION_1_12_0, ext_h),
ISA_EXT_DATA_ENTRY(v, false, PRIV_VERSION_1_10_0, ext_v),
+ ISA_EXT_DATA_ENTRY(zicbom, true, PRIV_VERSION_1_12_0, ext_icbom),
ISA_EXT_DATA_ENTRY(zicboz, true, PRIV_VERSION_1_12_0, ext_icboz),
ISA_EXT_DATA_ENTRY(zicond, true, PRIV_VERSION_1_12_0, ext_zicond),
ISA_EXT_DATA_ENTRY(zicsr, true, PRIV_VERSION_1_10_0, ext_icsr),
@@ -1168,6 +1169,8 @@ static Property riscv_cpu_extensions[] = {
DEFINE_PROP_BOOL("zhinx", RISCVCPU, cfg.ext_zhinx, false),
DEFINE_PROP_BOOL("zhinxmin", RISCVCPU, cfg.ext_zhinxmin, false),
+ DEFINE_PROP_BOOL("zicbom", RISCVCPU, cfg.ext_icbom, true),
+ DEFINE_PROP_UINT16("cbom_blocksize", RISCVCPU, cfg.cbom_blocksize, 64),
DEFINE_PROP_BOOL("zicboz", RISCVCPU, cfg.ext_icboz, true),
DEFINE_PROP_UINT16("cboz_blocksize", RISCVCPU, cfg.cboz_blocksize, 64),
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 73c9832fb7..b5b5425b99 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -434,6 +434,7 @@ struct RISCVCPUConfig {
bool ext_zkt;
bool ext_ifencei;
bool ext_icsr;
+ bool ext_icbom;
bool ext_icboz;
bool ext_zicond;
bool ext_zihintpause;
@@ -487,6 +488,7 @@ struct RISCVCPUConfig {
char *vext_spec;
uint16_t vlen;
uint16_t elen;
+ uint16_t cbom_blocksize;
uint16_t cboz_blocksize;
bool mmu;
bool pmp;
diff --git a/target/riscv/helper.h b/target/riscv/helper.h
index ce165821b8..37b54e0991 100644
--- a/target/riscv/helper.h
+++ b/target/riscv/helper.h
@@ -98,6 +98,8 @@ DEF_HELPER_FLAGS_2(fcvt_h_lu, TCG_CALL_NO_RWG, i64, env, tl)
DEF_HELPER_FLAGS_2(fclass_h, TCG_CALL_NO_RWG_SE, tl, env, i64)
/* Cache-block operations */
+DEF_HELPER_2(cbo_clean_flush, void, env, tl)
+DEF_HELPER_2(cbo_inval, void, env, tl)
DEF_HELPER_2(cbo_zero, void, env, tl)
/* Special functions */
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index a471adcea0..282e41aa3e 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -181,6 +181,11 @@ sraw 0100000 ..... ..... 101 ..... 0111011 @r
ldu ............ ..... 111 ..... 0000011 @i
{
[
+ # *** RV32 Zicbom Standard Extension ***
+ cbo_clean 0000000 00001 ..... 010 00000 0001111 @sfence_vm
+ cbo_flush 0000000 00010 ..... 010 00000 0001111 @sfence_vm
+ cbo_inval 0000000 00000 ..... 010 00000 0001111 @sfence_vm
+
# *** RV32 Zicboz Standard Extension ***
cbo_zero 0000000 00100 ..... 010 00000 0001111 @sfence_vm
]
diff --git a/target/riscv/insn_trans/trans_rvzicbo.c.inc
b/target/riscv/insn_trans/trans_rvzicbo.c.inc
index feabc28342..7df9c30b58 100644
--- a/target/riscv/insn_trans/trans_rvzicbo.c.inc
+++ b/target/riscv/insn_trans/trans_rvzicbo.c.inc
@@ -16,12 +16,39 @@
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#define REQUIRE_ZICBOM(ctx) do { \
+ if (!ctx->cfg_ptr->ext_icbom) { \
+ return false; \
+ } \
+} while (0)
+
#define REQUIRE_ZICBOZ(ctx) do { \
if (!ctx->cfg_ptr->ext_icboz) { \
return false; \
} \
} while (0)
+static bool trans_cbo_clean(DisasContext *ctx, arg_cbo_clean *a)
+{
+ REQUIRE_ZICBOM(ctx);
+ gen_helper_cbo_clean_flush(cpu_env, cpu_gpr[a->rs1]);
+ return true;
+}
+
+static bool trans_cbo_flush(DisasContext *ctx, arg_cbo_flush *a)
+{
+ REQUIRE_ZICBOM(ctx);
+ gen_helper_cbo_clean_flush(cpu_env, cpu_gpr[a->rs1]);
+ return true;
+}
+
+static bool trans_cbo_inval(DisasContext *ctx, arg_cbo_inval *a)
+{
+ REQUIRE_ZICBOM(ctx);
+ gen_helper_cbo_inval(cpu_env, cpu_gpr[a->rs1]);
+ return true;
+}
+
static bool trans_cbo_zero(DisasContext *ctx, arg_cbo_zero *a)
{
REQUIRE_ZICBOZ(ctx);
diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c
index d0217b6a98..84ee018f7d 100644
--- a/target/riscv/op_helper.c
+++ b/target/riscv/op_helper.c
@@ -191,6 +191,73 @@ void helper_cbo_zero(CPURISCVState *env, target_ulong
address)
}
}
+/*
+ * check_zicbom_access
+ *
+ * Check access permissions (LOAD, STORE or FETCH as specified in
+ * section 2.5.2 of the CMO specification) for Zicbom, raising
+ * either store page-fault (non-virtualized) or store guest-page
+ * fault (virtualized).
+ */
+static void check_zicbom_access(CPURISCVState *env,
+ target_ulong address,
+ uintptr_t ra)
+{
+ RISCVCPU *cpu = env_archcpu(env);
+ int mmu_idx = cpu_mmu_index(env, false);
+ uint16_t cbomlen = cpu->cfg.cbom_blocksize;
+ void *phost;
+ int ret;
+
+ /* Mask off low-bits to align-down to the cache-block. */
+ address &= ~(cbomlen - 1);
+
+ /*
+ * Section 2.5.2 of cmobase v1.0.1:
+ *
+ * "A cache-block management instruction is permitted to
+ * access the specified cache block whenever a load instruction
+ * or store instruction is permitted to access the corresponding
+ * physical addresses. If neither a load instruction nor store
+ * instruction is permitted to access the physical addresses,
+ * but an instruction fetch is permitted to access the physical
+ * addresses, whether a cache-block management instruction is
+ * permitted to access the cache block is UNSPECIFIED."
+ */
+ ret = probe_access_flags(env, address, cbomlen, MMU_DATA_LOAD,
+ mmu_idx, true, &phost, ra);
+ if (ret != TLB_INVALID_MASK) {
+ /* Success: readable */
+ return;
+ }
+
+ /*
+ * Since not readable, must be writable. On failure, store
+ * fault/store guest amo fault will be raised by
+ * riscv_cpu_tlb_fill(). PMP exceptions will be caught
+ * there as well.
+ */
+ probe_write(env, address, cbomlen, mmu_idx, ra);
+}
+
+void helper_cbo_clean_flush(CPURISCVState *env, target_ulong address)
+{
+ uintptr_t ra = GETPC();
+ check_zicbo_envcfg(env, MENVCFG_CBCFE, ra);
+ check_zicbom_access(env, address, ra);
+
+ /* We don't emulate the cache-hierarchy, so we're done. */
+}
+
+void helper_cbo_inval(CPURISCVState *env, target_ulong address)
+{
+ uintptr_t ra = GETPC();
+ check_zicbo_envcfg(env, MENVCFG_CBIE, ra);
+ check_zicbom_access(env, address, ra);
+
+ /* We don't emulate the cache-hierarchy, so we're done. */
+}
+
#ifndef CONFIG_USER_ONLY
target_ulong helper_sret(CPURISCVState *env)
--
2.39.2
- [PULL 00/22] Sixth RISC-V PR for 8.0, Palmer Dabbelt, 2023/03/06
- [PULL 01/22] target/riscv: implement Zicboz extension, Palmer Dabbelt, 2023/03/06
- [PULL 03/22] target/riscv: add Zicbop cbo.prefetch{i, r, m} placeholder, Palmer Dabbelt, 2023/03/06
- [PULL 05/22] disas/riscv Fix ctzw disassemble, Palmer Dabbelt, 2023/03/06
- [PULL 02/22] target/riscv: implement Zicbom extension,
Palmer Dabbelt <=
- [PULL 06/22] target/riscv: cpu: Implement get_arch_id callback, Palmer Dabbelt, 2023/03/06
- [PULL 04/22] hw/riscv/virt.c: add cbo[mz]-block-size fdt properties, Palmer Dabbelt, 2023/03/06
- [PULL 07/22] hw: intc: Use cpu_by_arch_id to fetch CPU state, Palmer Dabbelt, 2023/03/06
- [PULL 08/22] gitlab/opensbi: Move to docker:stable, Palmer Dabbelt, 2023/03/06
- [PULL 10/22] riscv: Pass Object to register_cpu_props instead of DeviceState, Palmer Dabbelt, 2023/03/06
- [PULL 11/22] riscv: Change type of valid_vm_1_10_[32|64] to bool, Palmer Dabbelt, 2023/03/06
- [PULL 09/22] roms/opensbi: Upgrade from v1.1 to v1.2, Palmer Dabbelt, 2023/03/06
- [PULL 15/22] hw/riscv/virt: Add OEM_ID and OEM_TABLE_ID fields, Palmer Dabbelt, 2023/03/06
- [PULL 12/22] riscv: Allow user to set the satp mode, Palmer Dabbelt, 2023/03/06
- [PULL 14/22] riscv: Correctly set the device-tree entry 'mmu-type', Palmer Dabbelt, 2023/03/06