RISC-V: Provide the frequency of time CSR via hwprobe

The RISC-V architecture makes a real time counter CSR (via RDTIME
instruction) available for applications in U-mode but there is no
architected mechanism for an application to discover the frequency
the counter is running at. Some applications (e.g., DPDK) use the
time counter for basic performance analysis as well as fine grained
time-keeping.

Add support to the hwprobe system call to export the time CSR
frequency to code running in U-mode.

Signed-off-by: Yunhui Cui <cuiyunhui@bytedance.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Acked-by: Punit Agrawal <punit.agrawal@bytedance.com>
Link: https://lore.kernel.org/r/20240702033731.71955-2-cuiyunhui@bytedance.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
index 02eb4d9..3db60a0 100644 (file)
--- a/Documentation/arch/riscv/hwprobe.rst
+++ b/Documentation/arch/riscv/hwprobe.rst
@@ -264,3 +264,5 @@ The following keys are defined:
 
 * :c:macro:`RISCV_HWPROBE_KEY_HIGHEST_VIRT_ADDRESS`: An unsigned long which
   represent the highest userspace virtual address usable.
+
+* :c:macro:`RISCV_HWPROBE_KEY_TIME_CSR_FREQ`: Frequency (in Hz) of `time CSR`.

diff --git a/arch/riscv/include/asm/hwprobe.h b/arch/riscv/include/asm/hwprobe.h
index 150a987..ef01c18 100644 (file)
--- a/arch/riscv/include/asm/hwprobe.h
+++ b/arch/riscv/include/asm/hwprobe.h
@@ -8,7 +8,7 @@
 
 #include <uapi/asm/hwprobe.h>
 
-#define RISCV_HWPROBE_MAX_KEY 7
+#define RISCV_HWPROBE_MAX_KEY 8
 
 static inline bool riscv_hwprobe_key_is_valid(__s64 key)
 {

diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h
index 8b8f6ac..b706c8e 100644 (file)
--- a/arch/riscv/include/uapi/asm/hwprobe.h
+++ b/arch/riscv/include/uapi/asm/hwprobe.h
@@ -81,6 +81,7 @@ struct riscv_hwprobe {
 #define                RISCV_HWPROBE_MISALIGNED_MASK           (7 << 0)
 #define RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE    6
 #define RISCV_HWPROBE_KEY_HIGHEST_VIRT_ADDRESS 7
+#define RISCV_HWPROBE_KEY_TIME_CSR_FREQ        8
 /* Increase RISCV_HWPROBE_MAX_KEY when adding items. */
 
 /* Flags */

diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c
index 8a1c9ce..8d1b5c3 100644 (file)
--- a/arch/riscv/kernel/sys_hwprobe.c
+++ b/arch/riscv/kernel/sys_hwprobe.c
@@ -9,6 +9,7 @@
 #include <asm/cpufeature.h>
 #include <asm/hwprobe.h>
 #include <asm/processor.h>
+#include <asm/delay.h>
 #include <asm/sbi.h>
 #include <asm/switch_to.h>
 #include <asm/uaccess.h>
@@ -236,6 +237,10 @@ static void hwprobe_one_pair(struct riscv_hwprobe *pair,
                pair->value = user_max_virt_addr();
                break;
 
+       case RISCV_HWPROBE_KEY_TIME_CSR_FREQ:
+               pair->value = riscv_timebase;
+               break;
+
        /*
         * For forward compatibility, unknown keys don't fail the whole
         * call, but get their element key set to -1 and value set to 0