From: guoren@kernel.org
To: paul.walmsley@sifive.com, palmer@dabbelt.com, guoren@kernel.org,
panqinglin2020@iscas.ac.cn, bjorn@rivosinc.com,
conor.dooley@microchip.com, leobras@redhat.com,
peterz@infradead.org, keescook@chromium.org,
wuwei2016@iscas.ac.cn, xiaoguang.xing@sophgo.com,
chao.wei@sophgo.com, unicorn_wang@outlook.com, uwu@icenowy.me,
jszhang@kernel.org, wefu@redhat.com, atishp@atishpatra.org,
ajones@ventanamicro.com, anup@brainfault.org, mingo@redhat.com,
will@kernel.org, palmer@rivosinc.com, longman@redhat.com,
boqun.feng@gmail.com, tglx@linutronix.de, paulmck@kernel.org,
rostedt@goodmis.org, rdunlap@infradead.org,
catalin.marinas@arm.com, alexghiti@rivosinc.com,
greentime.hu@sifive.com
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, linux-doc@vger.kernel.org,
kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
linux-csky@vger.kernel.org, Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V11 03/17] riscv: Use Zicbop in arch_xchg when available
Date: Sun, 31 Dec 2023 03:29:54 -0500 [thread overview]
Message-ID: <20230910082911.3378782-4-guoren@kernel.org> (raw)
Message-ID: <20231231082954.9UbRvmTdGANYH68arC7VcPicuoiQlk1-YT4Q6wzWvpI@z> (raw)
In-Reply-To: <20230910082911.3378782-1-guoren@kernel.org>
From: Guo Ren <guoren@linux.alibaba.com>
Cache-block prefetch instructions are HINTs to the hardware to
indicate that software intends to perform a particular type of
memory access in the near future. Enable ARCH_HAS_PREFETCHW and
improve the arch_xchg for qspinlock xchg_tail.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
arch/riscv/Kconfig | 15 +++++++++++++++
arch/riscv/include/asm/cmpxchg.h | 4 +++-
arch/riscv/include/asm/hwcap.h | 1 +
arch/riscv/include/asm/insn-def.h | 5 +++++
arch/riscv/include/asm/processor.h | 13 +++++++++++++
arch/riscv/kernel/cpufeature.c | 1 +
6 files changed, 38 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index e9ae6fa232c3..2c346fe169c1 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -617,6 +617,21 @@ config RISCV_ISA_ZICBOZ
If you don't know what to do here, say Y.
+config RISCV_ISA_ZICBOP
+ bool "Zicbop extension support for cache block prefetch"
+ depends on MMU
+ depends on RISCV_ALTERNATIVE
+ default y
+ help
+ Adds support to dynamically detect the presence of the ZICBOP
+ extension (Cache Block Prefetch Operations) and enable its
+ usage.
+
+ The Zicbop extension can be used to prefetch cache block for
+ read/write/instruction fetch.
+
+ If you don't know what to do here, say Y.
+
config TOOLCHAIN_HAS_ZIHINTPAUSE
bool
default y
diff --git a/arch/riscv/include/asm/cmpxchg.h b/arch/riscv/include/asm/cmpxchg.h
index 702725727671..56eff7a9d2d2 100644
--- a/arch/riscv/include/asm/cmpxchg.h
+++ b/arch/riscv/include/asm/cmpxchg.h
@@ -11,6 +11,7 @@
#include <asm/barrier.h>
#include <asm/fence.h>
+#include <asm/processor.h>
#define __arch_xchg_masked(prepend, append, r, p, n) \
({ \
@@ -25,6 +26,7 @@
\
__asm__ __volatile__ ( \
prepend \
+ PREFETCHW_ASM(%5) \
"0: lr.w %0, %2\n" \
" and %1, %0, %z4\n" \
" or %1, %1, %z3\n" \
@@ -32,7 +34,7 @@
" bnez %1, 0b\n" \
append \
: "=&r" (__retx), "=&r" (__rc), "+A" (*(__ptr32b)) \
- : "rJ" (__newx), "rJ" (~__mask) \
+ : "rJ" (__newx), "rJ" (~__mask), "rJ" (__ptr32b) \
: "memory"); \
\
r = (__typeof__(*(p)))((__retx & __mask) >> __s); \
diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
index b7b58258f6c7..78b7b8b53778 100644
--- a/arch/riscv/include/asm/hwcap.h
+++ b/arch/riscv/include/asm/hwcap.h
@@ -58,6 +58,7 @@
#define RISCV_ISA_EXT_ZICSR 40
#define RISCV_ISA_EXT_ZIFENCEI 41
#define RISCV_ISA_EXT_ZIHPM 42
+#define RISCV_ISA_EXT_ZICBOP 43
#define RISCV_ISA_EXT_MAX 64
diff --git a/arch/riscv/include/asm/insn-def.h b/arch/riscv/include/asm/insn-def.h
index 6960beb75f32..dc590d331894 100644
--- a/arch/riscv/include/asm/insn-def.h
+++ b/arch/riscv/include/asm/insn-def.h
@@ -134,6 +134,7 @@
#define RV_OPCODE_MISC_MEM RV_OPCODE(15)
#define RV_OPCODE_SYSTEM RV_OPCODE(115)
+#define RV_OPCODE_PREFETCH RV_OPCODE(19)
#define HFENCE_VVMA(vaddr, asid) \
INSN_R(OPCODE_SYSTEM, FUNC3(0), FUNC7(17), \
@@ -196,4 +197,8 @@
INSN_I(OPCODE_MISC_MEM, FUNC3(2), __RD(0), \
RS1(base), SIMM12(4))
+#define CBO_prefetchw(base) \
+ INSN_R(OPCODE_PREFETCH, FUNC3(6), FUNC7(0), \
+ RD(x0), RS1(base), RS2(x0))
+
#endif /* __ASM_INSN_DEF_H */
diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index de9da852f78d..7ad3a24212e8 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -12,6 +12,8 @@
#include <vdso/processor.h>
#include <asm/ptrace.h>
+#include <asm/insn-def.h>
+#include <asm/hwcap.h>
#ifdef CONFIG_64BIT
#define DEFAULT_MAP_WINDOW (UL(1) << (MMAP_VA_BITS - 1))
@@ -103,6 +105,17 @@ static inline void arch_thread_struct_whitelist(unsigned long *offset,
#define KSTK_EIP(tsk) (ulong)(task_pt_regs(tsk)->epc)
#define KSTK_ESP(tsk) (ulong)(task_pt_regs(tsk)->sp)
+#define ARCH_HAS_PREFETCHW
+#define PREFETCHW_ASM(base) ALTERNATIVE(__nops(1), \
+ CBO_prefetchw(base), \
+ 0, \
+ RISCV_ISA_EXT_ZICBOP, \
+ CONFIG_RISCV_ISA_ZICBOP)
+static inline void prefetchw(const void *ptr)
+{
+ asm volatile(PREFETCHW_ASM(%0)
+ : : "r" (ptr) : "memory");
+}
/* Do necessary setup to start up a newly executed thread. */
extern void start_thread(struct pt_regs *regs,
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index ef7b4fd9e876..e0b897db0b97 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -159,6 +159,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
__RISCV_ISA_EXT_DATA(h, RISCV_ISA_EXT_h),
__RISCV_ISA_EXT_DATA(zicbom, RISCV_ISA_EXT_ZICBOM),
__RISCV_ISA_EXT_DATA(zicboz, RISCV_ISA_EXT_ZICBOZ),
+ __RISCV_ISA_EXT_DATA(zicbop, RISCV_ISA_EXT_ZICBOP),
__RISCV_ISA_EXT_DATA(zicntr, RISCV_ISA_EXT_ZICNTR),
__RISCV_ISA_EXT_DATA(zicsr, RISCV_ISA_EXT_ZICSR),
__RISCV_ISA_EXT_DATA(zifencei, RISCV_ISA_EXT_ZIFENCEI),
--
2.36.1
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
next prev parent reply other threads:[~2023-12-31 8:30 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-10 8:28 [PATCH V11 00/17] riscv: Add Native/Paravirt qspinlock support guoren
2023-09-10 8:28 ` [PATCH V11 01/17] asm-generic: ticket-lock: Reuse arch_spinlock_t of qspinlock guoren
2023-09-11 19:05 ` Leonardo Brás
2023-09-13 1:55 ` Guo Ren
2023-09-13 7:59 ` Leonardo Bras
2023-09-10 8:28 ` [PATCH V11 02/17] asm-generic: ticket-lock: Move into ticket_spinlock.h guoren
2023-09-13 8:15 ` Leonardo Bras
2023-09-10 8:28 ` guoren [this message]
2023-09-13 8:49 ` [PATCH V11 03/17] riscv: Use Zicbop in arch_xchg when available Leonardo Bras
2023-09-15 12:36 ` Guo Ren
2023-09-16 1:25 ` Leonardo Bras
2023-09-17 14:34 ` Guo Ren
2023-09-19 5:13 ` Leonardo Bras
2023-09-19 7:53 ` Guo Ren
2023-09-19 14:38 ` Leonardo Bras
2023-09-14 13:47 ` Andrew Jones
2023-09-15 8:22 ` Leonardo Bras
2023-09-15 11:07 ` Andrew Jones
2023-09-15 11:26 ` Conor Dooley
2023-09-15 12:22 ` Andrew Jones
2023-09-15 12:42 ` Conor Dooley
2023-09-16 0:05 ` Conor Dooley
2023-09-15 20:32 ` Leonardo Bras
2023-09-14 14:25 ` Andrew Jones
2023-09-14 14:47 ` Andrew Jones
2023-09-15 11:37 ` Conor Dooley
2023-09-15 12:14 ` Andrew Jones
2023-09-15 12:53 ` Conor Dooley
2023-12-31 8:29 ` guoren
2023-09-10 8:28 ` [PATCH V11 04/17] locking/qspinlock: Improve xchg_tail for number of cpus >= 16k guoren
2023-09-11 2:35 ` Waiman Long
2023-09-11 3:09 ` Guo Ren
2023-09-11 13:03 ` Waiman Long
2023-09-12 1:10 ` Guo Ren
2023-09-13 8:55 ` Leonardo Bras
2023-09-13 12:52 ` Guo Ren
2023-09-13 13:06 ` Waiman Long
2023-09-14 3:45 ` Guo Ren
2023-09-10 8:28 ` [PATCH V11 05/17] riscv: qspinlock: Add basic queued_spinlock support guoren
2023-09-13 20:28 ` Leonardo Bras
2023-09-14 4:46 ` Guo Ren
2023-09-14 9:43 ` Leonardo Bras
2023-09-15 2:10 ` Guo Ren
2023-09-15 9:08 ` Leonardo Bras
2023-09-17 15:02 ` Guo Ren
2023-09-19 5:20 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 06/17] riscv: qspinlock: Introduce combo spinlock guoren
2023-09-10 11:06 ` Guo Ren
2023-09-13 20:37 ` Leonardo Bras
2023-09-13 20:49 ` Leonardo Bras
2023-09-14 4:49 ` Guo Ren
2023-09-14 7:17 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 07/17] riscv: qspinlock: Introduce qspinlock param for command line guoren
2023-09-11 15:22 ` Waiman Long
2023-09-12 1:06 ` Guo Ren
2023-09-11 15:34 ` Waiman Long
2023-09-12 1:08 ` Guo Ren
2023-09-14 7:32 ` Leonardo Bras
2023-09-14 17:23 ` Waiman Long
2023-09-10 8:29 ` [PATCH V11 08/17] riscv: qspinlock: Add virt_spin_lock() support for KVM guest guoren
2023-09-14 8:02 ` Leonardo Bras
2023-09-17 15:12 ` Guo Ren
2023-09-19 5:30 ` Leonardo Bras
2023-09-19 8:04 ` Guo Ren
2023-09-19 14:40 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 09/17] riscv: qspinlock: errata: Add ERRATA_THEAD_WRITE_ONCE fixup guoren
2023-09-14 8:32 ` Leonardo Bras
2023-09-17 15:15 ` Guo Ren
2023-09-19 5:34 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 10/17] riscv: qspinlock: errata: Enable qspinlock for T-HEAD processors guoren
2023-09-14 9:36 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 11/17] RISC-V: paravirt: pvqspinlock: Add paravirt qspinlock skeleton guoren
2023-09-15 5:42 ` Leonardo Bras
2023-09-17 14:58 ` Guo Ren
2023-09-19 5:43 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 12/17] RISC-V: paravirt: pvqspinlock: Add nopvspin kernel parameter guoren
2023-09-15 6:05 ` Leonardo Bras
2023-09-17 15:03 ` Guo Ren
2023-09-19 5:44 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 13/17] RISC-V: paravirt: pvqspinlock: Add SBI implementation guoren
2023-09-15 6:23 ` Leonardo Bras
2023-09-17 15:06 ` Guo Ren
2023-09-19 5:45 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 14/17] RISC-V: paravirt: pvqspinlock: Add kconfig entry guoren
2023-09-15 6:25 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 15/17] RISC-V: paravirt: pvqspinlock: Add trace point for pv_kick/wait guoren
2023-09-15 6:33 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 16/17] RISC-V: paravirt: pvqspinlock: KVM: Add paravirt qspinlock skeleton guoren
2023-09-15 6:46 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 17/17] RISC-V: paravirt: pvqspinlock: KVM: Implement kvm_sbi_ext_pvlock_kick_cpu() guoren
2023-09-15 6:52 ` Leonardo Bras
2023-09-10 8:58 ` [PATCH V11 00/17] riscv: Add Native/Paravirt qspinlock support Conor Dooley
2023-09-10 9:16 ` Guo Ren
2023-09-10 9:20 ` Guo Ren
2023-09-10 9:31 ` Conor Dooley
2023-09-10 9:49 ` Guo Ren
2023-09-10 19:45 ` Conor Dooley
2023-09-11 3:36 ` Guo Ren
2023-09-11 12:52 ` Conor Dooley
2023-09-12 1:33 ` Guo Ren
2023-09-12 8:07 ` Conor Dooley
2023-09-12 10:58 ` Guo Ren
2023-11-06 20:42 ` Leonardo Bras
2023-11-12 4:23 ` Guo Ren
2023-11-13 10:19 ` Leonardo Bras Soares Passos
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230910082911.3378782-4-guoren@kernel.org \
--to=guoren@kernel.org \
--cc=ajones@ventanamicro.com \
--cc=alexghiti@rivosinc.com \
--cc=anup@brainfault.org \
--cc=atishp@atishpatra.org \
--cc=bjorn@rivosinc.com \
--cc=boqun.feng@gmail.com \
--cc=catalin.marinas@arm.com \
--cc=chao.wei@sophgo.com \
--cc=conor.dooley@microchip.com \
--cc=greentime.hu@sifive.com \
--cc=guoren@linux.alibaba.com \
--cc=jszhang@kernel.org \
--cc=keescook@chromium.org \
--cc=kvm@vger.kernel.org \
--cc=leobras@redhat.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-csky@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=longman@redhat.com \
--cc=mingo@redhat.com \
--cc=palmer@dabbelt.com \
--cc=palmer@rivosinc.com \
--cc=panqinglin2020@iscas.ac.cn \
--cc=paul.walmsley@sifive.com \
--cc=paulmck@kernel.org \
--cc=peterz@infradead.org \
--cc=rdunlap@infradead.org \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
--cc=unicorn_wang@outlook.com \
--cc=uwu@icenowy.me \
--cc=virtualization@lists.linux-foundation.org \
--cc=wefu@redhat.com \
--cc=will@kernel.org \
--cc=wuwei2016@iscas.ac.cn \
--cc=xiaoguang.xing@sophgo.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).