Fixes performance related issue when running vxWorks 5/7 images. The overall memory performance (L1, L2 cache and ram) was measured with Bandwidth [0].
Without this patch we get following numbers: - sequential 128-bit reads: ~5.2 GB/s - sequential 128-bit copy: ~2.1 GB/s - random 32-bit writes: ~1.2 GB/s
With this patch patch we get the following numbers: - sequential 128-bit reads: ~18.0 GB/s - sequential 128-bit copy: ~9.5 GB/s - random 32-bit writes: ~5.0 GB/s
[0] https://zsmith.co/bandwidth.html
v1 -> v2: - incorporate feedback from Bin Meng
Signed-off-by: Christian Gmeiner christian.gmeiner@gmail.com --- arch/x86/cpu/queensbay/Makefile | 2 +- arch/x86/cpu/queensbay/cpu.c | 58 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 59 insertions(+), 1 deletion(-) create mode 100644 arch/x86/cpu/queensbay/cpu.c
diff --git a/arch/x86/cpu/queensbay/Makefile b/arch/x86/cpu/queensbay/Makefile index c0681995bd..3dd23465d4 100644 --- a/arch/x86/cpu/queensbay/Makefile +++ b/arch/x86/cpu/queensbay/Makefile @@ -5,4 +5,4 @@ #
obj-y += fsp_configs.o irq.o -obj-y += tnc.o +obj-y += tnc.o cpu.o diff --git a/arch/x86/cpu/queensbay/cpu.c b/arch/x86/cpu/queensbay/cpu.c new file mode 100644 index 0000000000..805a94cc27 --- /dev/null +++ b/arch/x86/cpu/queensbay/cpu.c @@ -0,0 +1,58 @@ +/* + * Copyright (C) 2018, Bachmann electronic GmbH + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <cpu.h> +#include <dm.h> +#include <asm/cpu.h> +#include <asm/cpu_x86.h> +#include <asm/msr.h> + +static void set_max_freq(void) +{ + msr_t msr; + + /* Enable enhanced speed step */ + msr = msr_read(MSR_IA32_MISC_ENABLES); + msr.lo |= (1 << 16); + msr_write(MSR_IA32_MISC_ENABLES, msr); + + /* Set new performance state */ + msr = msr_read(MSR_IA32_PERF_CTL); + msr.lo = 0x101f; + msr_write(MSR_IA32_PERF_CTL, msr); +} + +static int cpu_x86_tunnelcreek_probe(struct udevice *dev) +{ + if (!ll_boot_init()) + return 0; + debug("Init TunnelCreek core\n"); + + /* Set core to max frequency ratio */ + set_max_freq(); + + return 0; +} + +static const struct cpu_ops cpu_x86_tunnelcreek_ops = { + .get_desc = cpu_x86_get_desc, + .get_count = cpu_x86_get_count, +}; + +static const struct udevice_id cpu_x86_tunnelcreek_ids[] = { + { .compatible = "intel,tunnelcreek-cpu" }, + { } +}; + +U_BOOT_DRIVER(cpu_x86_tunnelcreek_drv) = { + .name = "cpu_x86_tunnelcreek", + .id = UCLASS_CPU, + .of_match = cpu_x86_tunnelcreek_ids, + .bind = cpu_x86_bind, + .probe = cpu_x86_tunnelcreek_probe, + .ops = &cpu_x86_tunnelcreek_ops, +};