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Date: Tue, 23 Jul 2024 11:33:00 +0100
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Subject: Re: [PATCH v1 4/4] power/amd_uncore: uncore power management support
for AMD EPYC processors
To: Sivaprasad Tummala <sivaprasad.tummala@amd.com>,
<anatoly.burakov@intel.com>, <jerinj@marvell.com>, <lihuisong@huawei.com>,
<david.marchand@redhat.com>, <ferruh.yigit@amd.com>,
<konstantin.ananyev@huawei.com>
CC: <dev@dpdk.org>
References: <20240220153326.6236-1-sivaprasad.tummala@amd.com>
<20240720165030.246294-1-sivaprasad.tummala@amd.com>
<20240720165030.246294-5-sivaprasad.tummala@amd.com>
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Errors-To: dev-bounces@dpdk.org
On 20/07/2024 17:50, Sivaprasad Tummala wrote:
> This patch introduces driver support for power management of uncore
> components in AMD EPYC processors.
>
> Signed-off-by: Sivaprasad Tummala <sivaprasad.tummala@amd.com>
> ---
> drivers/power/amd_uncore/amd_uncore.c | 321 ++++++++++++++++++++++++++
> drivers/power/amd_uncore/amd_uncore.h | 226 ++++++++++++++++++
> drivers/power/amd_uncore/meson.build | 20 ++
> drivers/power/meson.build | 1 +
> 4 files changed, 568 insertions(+)
> create mode 100644 drivers/power/amd_uncore/amd_uncore.c
> create mode 100644 drivers/power/amd_uncore/amd_uncore.h
> create mode 100644 drivers/power/amd_uncore/meson.build
>
> diff --git a/drivers/power/amd_uncore/amd_uncore.c b/drivers/power/amd_uncore/amd_uncore.c
> new file mode 100644
> index 0000000000..f15eaaa307
> --- /dev/null
> +++ b/drivers/power/amd_uncore/amd_uncore.c
> @@ -0,0 +1,321 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2024 Advanced Micro Devices, Inc.
> + */
> +
> +#include <errno.h>
> +#include <dirent.h>
> +#include <fnmatch.h>
> +
> +#include <rte_memcpy.h>
> +
> +#include "amd_uncore.h"
> +#include "power_common.h"
> +#include "e_smi/e_smi.h"
> +
> +#define MAX_UNCORE_FREQS 8
> +#define MAX_NUMA_DIE 8
> +
> +#define BUS_FREQ 1000
> +
> +struct __rte_cache_aligned uncore_power_info {
> + unsigned int die; /* Core die id */
> + unsigned int pkg; /* Package id */
> + uint32_t freqs[MAX_UNCORE_FREQS]; /* Frequency array */
> + uint32_t nb_freqs; /* Number of available freqs */
> + uint32_t curr_idx; /* Freq index in freqs array */
> + uint32_t max_freq; /* System max uncore freq */
> + uint32_t min_freq; /* System min uncore freq */
> +};
> +
> +static struct uncore_power_info uncore_info[RTE_MAX_NUMA_NODES][MAX_NUMA_DIE];
> +static int esmi_initialized;
> +
> +static int
> +set_uncore_freq_internal(struct uncore_power_info *ui, uint32_t idx)
> +{
> + int ret;
> +
> + if (idx >= MAX_UNCORE_FREQS || idx >= ui->nb_freqs) {
> + POWER_LOG(DEBUG, "Invalid uncore frequency index %u, which "
> + "should be less than %u", idx, ui->nb_freqs);
> + return -1;
> + }
> +
> + ret = esmi_apb_disable(ui->pkg, idx);
> + if (ret != ESMI_SUCCESS) {
> + POWER_LOG(ERR, "DF P-state '%u' set failed for pkg %02u",
> + idx, ui->pkg);
> + return -1;
> + }
> +
> + POWER_DEBUG_LOG("DF P-state '%u' to be set for pkg %02u die %02u",
> + idx, ui->pkg, ui->die);
> +
> + /* write the minimum value first if the target freq is less than current max */
> + ui->curr_idx = idx;
> +
> + return 0;
> +}
> +
> +/*
> + * Fopen the sys file for the future setting of the uncore die frequency.
> + */
Comment may need updating, as function is not reading any sysfs files
(for the moment, at least).
> +static int
> +power_init_for_setting_uncore_freq(struct uncore_power_info *ui)
> +{
> + /* open and read all uncore sys files */
Comment may need updating, as function is not reading any sysfs files
(for the moment, at least).
> + /* Base max */
> + ui->max_freq = 1800000;
> + ui->min_freq = 1200000;
> +
> + return 0;
> +}
> +
> +/*
> + * Get the available uncore frequencies of the specific die by reading the
> + * sys file.
> + */
Comment may need updating, as function is not reading any sysfs files. 3
uncore frequencies hard-coded for the moment, may get via esmi or sysfs
in the future.
> +static int
> +power_get_available_uncore_freqs(struct uncore_power_info *ui)
> +{
> + int ret = -1;
> + uint32_t i, num_uncore_freqs = 3;
> + uint32_t fabric_freqs[] = {
> + /* to be extended for probing support in future */
> + 1800,
> + 1444,
> + 1200
> + };
> +
> + if (num_uncore_freqs >= MAX_UNCORE_FREQS) {
> + POWER_LOG(ERR, "Too many available uncore frequencies: %d",
> + num_uncore_freqs);
> + goto out;
> + }
> +
> + /* Generate the uncore freq bucket array. */
> + for (i = 0; i < num_uncore_freqs; i++)
> + ui->freqs[i] = fabric_freqs[i] * BUS_FREQ;
> +
> + ui->nb_freqs = num_uncore_freqs;
> +
> + ret = 0;
> +
> + POWER_DEBUG_LOG("%d frequency(s) of pkg %02u die %02u are available",
> + num_uncore_freqs, ui->pkg, ui->die);
> +
> +out:
> + return ret;
> +}
> +
--snip--
>