99a2dd955f
There is no reason for the DPDK libraries to all have 'librte_' prefix on the directory names. This prefix makes the directory names longer and also makes it awkward to add features referring to individual libraries in the build - should the lib names be specified with or without the prefix. Therefore, we can just remove the library prefix and use the library's unique name as the directory name, i.e. 'eal' rather than 'librte_eal' Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
124 lines
1.8 KiB
C
124 lines
1.8 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2017 Intel Corporation
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*/
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#include <fcntl.h>
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#include <unistd.h>
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#include <cpuid.h>
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#include <rte_common.h>
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#include "eal_private.h"
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static unsigned int
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rte_cpu_get_model(uint32_t fam_mod_step)
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{
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uint32_t family, model, ext_model;
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family = (fam_mod_step >> 8) & 0xf;
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model = (fam_mod_step >> 4) & 0xf;
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if (family == 6 || family == 15) {
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ext_model = (fam_mod_step >> 16) & 0xf;
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model += (ext_model << 4);
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}
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return model;
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}
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static int32_t
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rdmsr(int msr, uint64_t *val)
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{
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#ifdef RTE_EXEC_ENV_LINUX
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int fd;
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int ret;
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fd = open("/dev/cpu/0/msr", O_RDONLY);
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if (fd < 0)
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return fd;
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ret = pread(fd, val, sizeof(uint64_t), msr);
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close(fd);
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return ret;
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#else
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RTE_SET_USED(msr);
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RTE_SET_USED(val);
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return -1;
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#endif
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}
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static uint32_t
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check_model_wsm_nhm(uint8_t model)
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{
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switch (model) {
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/* Westmere */
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case 0x25:
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case 0x2C:
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case 0x2F:
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/* Nehalem */
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case 0x1E:
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case 0x1F:
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case 0x1A:
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case 0x2E:
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return 1;
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}
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return 0;
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}
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static uint32_t
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check_model_gdm_dnv(uint8_t model)
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{
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switch (model) {
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/* Goldmont */
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case 0x5C:
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/* Denverton */
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case 0x5F:
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return 1;
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}
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return 0;
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}
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uint64_t
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get_tsc_freq_arch(void)
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{
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uint64_t tsc_hz = 0;
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uint32_t a, b, c, d, maxleaf;
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uint8_t mult, model;
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int32_t ret;
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/*
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* Time Stamp Counter and Nominal Core Crystal Clock
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* Information Leaf
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*/
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maxleaf = __get_cpuid_max(0, NULL);
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if (maxleaf >= 0x15) {
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__cpuid(0x15, a, b, c, d);
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/* EBX : TSC/Crystal ratio, ECX : Crystal Hz */
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if (b && c)
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return c * (b / a);
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}
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__cpuid(0x1, a, b, c, d);
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model = rte_cpu_get_model(a);
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if (check_model_wsm_nhm(model))
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mult = 133;
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else if ((c & bit_AVX) || check_model_gdm_dnv(model))
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mult = 100;
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else
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return 0;
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ret = rdmsr(0xCE, &tsc_hz);
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if (ret < 0)
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return 0;
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return ((tsc_hz >> 8) & 0xff) * mult * 1E6;
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}
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