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SubjectRe: [PATCH v8 08/12] mfd: intel-peci-client: Add PECI client MFD driver
On Tue, 18 Sep 2018, Jae Hyun Yoo wrote:

> This commit adds PECI client MFD driver.
>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Randy Dunlap <rdunlap@infradead.org>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Andrew Jeffery <andrew@aj.id.au>
> Cc: James Feist <james.feist@linux.intel.com>
> Cc: Jason M Biils <jason.m.bills@linux.intel.com>
> Cc: Joel Stanley <joel@jms.id.au>
> Cc: Vernon Mauery <vernon.mauery@linux.intel.com>
> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
> ---
> drivers/mfd/Kconfig | 14 ++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/intel-peci-client.c | 181 ++++++++++++++++++++++++++
> include/linux/mfd/intel-peci-client.h | 81 ++++++++++++
> 4 files changed, 277 insertions(+)
> create mode 100644 drivers/mfd/intel-peci-client.c
> create mode 100644 include/linux/mfd/intel-peci-client.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 11841f4b7b2b..e68ae5d820ba 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -595,6 +595,20 @@ config MFD_INTEL_MSIC
> Passage) chip. This chip embeds audio, battery, GPIO, etc.
> devices used in Intel Medfield platforms.
>
> +config MFD_INTEL_PECI_CLIENT
> + bool "Intel PECI client"
> + depends on (PECI || COMPILE_TEST)
> + select MFD_CORE
> + help
> + If you say yes to this option, support will be included for the
> + multi-functional Intel PECI (Platform Environment Control Interface)

Remove 'multi-functional' from this sentence.

> + client. PECI is a one-wire bus interface that provides a communication
> + channel from PECI clients in Intel processors and chipset components
> + to external monitoring or control devices.
> +
> + Additional drivers must be enabled in order to use the functionality
> + of the device.
> +
> config MFD_IPAQ_MICRO
> bool "Atmel Micro ASIC (iPAQ h3100/h3600/h3700) Support"
> depends on SA1100_H3100 || SA1100_H3600
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 5856a9489cbd..ed05583dc30e 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -203,6 +203,7 @@ obj-$(CONFIG_MFD_INTEL_LPSS) += intel-lpss.o
> obj-$(CONFIG_MFD_INTEL_LPSS_PCI) += intel-lpss-pci.o
> obj-$(CONFIG_MFD_INTEL_LPSS_ACPI) += intel-lpss-acpi.o
> obj-$(CONFIG_MFD_INTEL_MSIC) += intel_msic.o
> +obj-$(CONFIG_MFD_INTEL_PECI_CLIENT) += intel-peci-client.o
> obj-$(CONFIG_MFD_PALMAS) += palmas.o
> obj-$(CONFIG_MFD_VIPERBOARD) += viperboard.o
> obj-$(CONFIG_MFD_RC5T583) += rc5t583.o rc5t583-irq.o
> diff --git a/drivers/mfd/intel-peci-client.c b/drivers/mfd/intel-peci-client.c
> new file mode 100644
> index 000000000000..507e4ac66dfa
> --- /dev/null
> +++ b/drivers/mfd/intel-peci-client.c
> @@ -0,0 +1,181 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2018 Intel Corporation
> +
> +#include <linux/bitfield.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/intel-peci-client.h>
> +#include <linux/module.h>
> +#include <linux/peci.h>
> +#include <linux/of_device.h>
> +
> +enum cpu_gens {
> + CPU_GEN_HSX = 0, /* Haswell Xeon */
> + CPU_GEN_BRX, /* Broadwell Xeon */
> + CPU_GEN_SKX, /* Skylake Xeon */
> +};
> +
> +static struct mfd_cell peci_functions[] = {
> + {
> + .name = "peci-cputemp",
> + },
> + {
> + .name = "peci-dimmtemp",
> + },

{ .name = "peci-cputemp", },
{ .name = "peci-dimmtemp", },

Do these have 2 different drivers? Where are you putting them?

> + /* TODO: Add additional PECI sideband functions into here */

When will this be done?

> +};
> +
> +static const struct cpu_gen_info cpu_gen_info_table[] = {
> + [CPU_GEN_HSX] = {
> + .family = 6, /* Family code */
> + .model = INTEL_FAM6_HASWELL_X,
> + .core_max = CORE_MAX_ON_HSX,
> + .chan_rank_max = CHAN_RANK_MAX_ON_HSX,
> + .dimm_idx_max = DIMM_IDX_MAX_ON_HSX },
> + [CPU_GEN_BRX] = {
> + .family = 6, /* Family code */
> + .model = INTEL_FAM6_BROADWELL_X,
> + .core_max = CORE_MAX_ON_BDX,
> + .chan_rank_max = CHAN_RANK_MAX_ON_BDX,
> + .dimm_idx_max = DIMM_IDX_MAX_ON_BDX },
> + [CPU_GEN_SKX] = {
> + .family = 6, /* Family code */
> + .model = INTEL_FAM6_SKYLAKE_X,
> + .core_max = CORE_MAX_ON_SKX,
> + .chan_rank_max = CHAN_RANK_MAX_ON_SKX,
> + .dimm_idx_max = DIMM_IDX_MAX_ON_SKX },

The '},'s should go on the line below.

> +};
> +
> +static int peci_client_get_cpu_gen_info(struct peci_mfd *priv)

Remove all mention of 'mfd'. It's not a thing.

> +{
> + u32 cpu_id;
> + int i, rc;
> +
> + rc = peci_get_cpu_id(priv->adapter, priv->addr, &cpu_id);
> + if (rc)
> + return rc;
> +
> + for (i = 0; i < ARRAY_SIZE(cpu_gen_info_table); i++) {
> + if (FIELD_GET(CPU_ID_FAMILY_MASK, cpu_id) +
> + FIELD_GET(CPU_ID_EXT_FAMILY_MASK, cpu_id) ==
> + cpu_gen_info_table[i].family &&
> + FIELD_GET(CPU_ID_MODEL_MASK, cpu_id) ==
> + FIELD_GET(LOWER_NIBBLE_MASK,
> + cpu_gen_info_table[i].model) &&
> + FIELD_GET(CPU_ID_EXT_MODEL_MASK, cpu_id) ==
> + FIELD_GET(UPPER_NIBBLE_MASK,
> + cpu_gen_info_table[i].model)) {
> + break;
> + }
> + }

This is really read. Please reformat it, even if you have to use
local variables to make it more legible.

> + if (i >= ARRAY_SIZE(cpu_gen_info_table))
> + return -ENODEV;

Do you really want to fail silently?

> + priv->gen_info = &cpu_gen_info_table[i];

If you do this in the for(), you can then test priv->gen_info instead
of seeing if the iterator maxed out. Much nicer I think.

> + return 0;
> +}
> +
> +bool peci_temp_need_update(struct temp_data *temp)
> +{
> + if (temp->valid &&
> + time_before(jiffies, temp->last_updated + UPDATE_INTERVAL))
> + return false;
> +
> + return true;
> +}
> +EXPORT_SYMBOL_GPL(peci_temp_need_update);
> +
> +void peci_temp_mark_updated(struct temp_data *temp)
> +{
> + temp->valid = 1;
> + temp->last_updated = jiffies;
> +}
> +EXPORT_SYMBOL_GPL(peci_temp_mark_updated);

These are probably better suited as inline functions to be placed in
a header file. No need to export them, since they only use their own
data.

> +int peci_client_command(struct peci_mfd *priv, enum peci_cmd cmd, void *vmsg)
> +{
> + return peci_command(priv->adapter, cmd, vmsg);
> +}
> +EXPORT_SYMBOL_GPL(peci_client_command);

If you share the adaptor with the client, you can call peci_command()
directly. There should also be some locking in here somewhere too.

> +int peci_client_rd_pkg_cfg_cmd(struct peci_mfd *priv, u8 mbx_idx,

This is gobbledegook. What's rd? Read?

> + u16 param, u8 *data)
> +{
> + struct peci_rd_pkg_cfg_msg msg;
> + int rc;
> +
> + msg.addr = priv->addr;
> + msg.index = mbx_idx;
> + msg.param = param;
> + msg.rx_len = 4;
> +
> + rc = peci_command(priv->adapter, PECI_CMD_RD_PKG_CFG, &msg);
> + if (!rc)
> + memcpy(data, msg.pkg_config, 4);
> +
> + return rc;
> +}
> +EXPORT_SYMBOL_GPL(peci_client_rd_pkg_cfg_cmd);

This too should be set-up as an inline function, not an exported one.

> +static int peci_client_probe(struct peci_client *client)
> +{
> + struct device *dev = &client->dev;
> + struct peci_mfd *priv;
> + int rc;

'ret' is more common.

> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + dev_set_drvdata(dev, priv);
> + priv->client = client;
> + priv->dev = dev;

> + priv->adapter = client->adapter;
> + priv->addr = client->addr;

You're already saving client. No need to save its individual
attributes as well.

> + priv->cpu_no = client->addr - PECI_BASE_ADDR;

This seems clunky. Does the spec say that the addresses have to be in
numerical order with no gaps? What if someone chooses to implement 4
CPUs at 0x30, 0x35, 0x45 and 0x60?

What do you then do with cpu_no?

> + snprintf(priv->name, PECI_NAME_SIZE, "peci_client.cpu%d", priv->cpu_no);
> +
> + rc = peci_client_get_cpu_gen_info(priv);
> + if (rc)
> + return rc;
> +
> + rc = devm_mfd_add_devices(priv->dev, priv->cpu_no, peci_functions,
> + ARRAY_SIZE(peci_functions), NULL, 0, NULL);
> + if (rc < 0) {
> + dev_err(priv->dev, "devm_mfd_add_devices failed: %d\n", rc);

This to too specific.

"Failed to register child devices"

> + return rc;
> + }
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id peci_client_of_table[] = {
> + { .compatible = "intel,peci-client" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, peci_client_of_table);
> +#endif
> +
> +static const struct peci_device_id peci_client_ids[] = {
> + { .name = "peci-client", .driver_data = 0 },

Remove .driver_data if you're not going to use it.

> + { }
> +};
> +MODULE_DEVICE_TABLE(peci, peci_client_ids);
> +
> +static struct peci_driver peci_client_driver = {
> + .probe = peci_client_probe,
> + .id_table = peci_client_ids,
> + .driver = {
> + .name = "peci-client",
> + .of_match_table =
> + of_match_ptr(peci_client_of_table),
> + },
> +};

Odd tabbing.

> +module_peci_driver(peci_client_driver);
> +
> +MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>");
> +MODULE_DESCRIPTION("PECI client MFD driver");

Remove "MFD".

> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/mfd/intel-peci-client.h b/include/linux/mfd/intel-peci-client.h
> new file mode 100644
> index 000000000000..7ec272cddceb
> --- /dev/null
> +++ b/include/linux/mfd/intel-peci-client.h
> @@ -0,0 +1,81 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright (c) 2018 Intel Corporation */
> +
> +#ifndef __LINUX_MFD_PECI_CLIENT_H
> +#define __LINUX_MFD_PECI_CLIENT_H
> +
> +#include <linux/peci.h>
> +
> +#if IS_ENABLED(CONFIG_X86)
> +#include <asm/intel-family.h>
> +#else
> +/**
> + * Architectures other than x86 cannot include the header file so define these
> + * at here. These are needed for detecting type of client x86 CPUs behind a PECI
> + * connection.
> + */
> +#define INTEL_FAM6_HASWELL_X 0x3F
> +#define INTEL_FAM6_BROADWELL_X 0x4F
> +#define INTEL_FAM6_SKYLAKE_X 0x55
> +#endif
> +
> +#define LOWER_NIBBLE_MASK GENMASK(3, 0)
> +#define UPPER_NIBBLE_MASK GENMASK(7, 4)
> +
> +#define CPU_ID_MODEL_MASK GENMASK(7, 4)
> +#define CPU_ID_FAMILY_MASK GENMASK(11, 8)
> +#define CPU_ID_EXT_MODEL_MASK GENMASK(19, 16)
> +#define CPU_ID_EXT_FAMILY_MASK GENMASK(27, 20)
> +
> +#define CORE_MAX_ON_HSX 18 /* Max number of cores on Haswell */
> +#define CHAN_RANK_MAX_ON_HSX 8 /* Max number of channel ranks on Haswell */
> +#define DIMM_IDX_MAX_ON_HSX 3 /* Max DIMM index per channel on Haswell */
> +
> +#define CORE_MAX_ON_BDX 24 /* Max number of cores on Broadwell */
> +#define CHAN_RANK_MAX_ON_BDX 4 /* Max number of channel ranks on Broadwell */
> +#define DIMM_IDX_MAX_ON_BDX 3 /* Max DIMM index per channel on Broadwell */
> +
> +#define CORE_MAX_ON_SKX 28 /* Max number of cores on Skylake */
> +#define CHAN_RANK_MAX_ON_SKX 6 /* Max number of channel ranks on Skylake */
> +#define DIMM_IDX_MAX_ON_SKX 2 /* Max DIMM index per channel on Skylake */
> +
> +#define CORE_NUMS_MAX CORE_MAX_ON_SKX
> +#define CHAN_RANK_MAX CHAN_RANK_MAX_ON_HSX
> +#define DIMM_IDX_MAX DIMM_IDX_MAX_ON_HSX
> +#define DIMM_NUMS_MAX (CHAN_RANK_MAX * DIMM_IDX_MAX)
> +
> +#define TEMP_TYPE_PECI 6 /* Sensor type 6: Intel PECI */
> +
> +#define UPDATE_INTERVAL HZ
> +
> +struct temp_data {
> + uint valid;
> + s32 value;
> + ulong last_updated;
> +};
This should not live in here.

> +struct cpu_gen_info {
> + u16 family;
> + u8 model;
> + uint core_max;
> + uint chan_rank_max;
> + uint dimm_idx_max;
> +};
> +
> +struct peci_mfd {

Remove "_mfd".

> + struct peci_client *client;
> + struct device *dev;
> + struct peci_adapter *adapter;
> + char name[PECI_NAME_SIZE];

What is this used for?

> + u8 addr;
> + uint cpu_no;
> + const struct cpu_gen_info *gen_info;

Where is this used?

> +};

Both of these structs need kerneldoc headers.

> +bool peci_temp_need_update(struct temp_data *temp);
> +void peci_temp_mark_updated(struct temp_data *temp);

These should live in a temperature driver.

> +int peci_client_command(struct peci_mfd *mfd, enum peci_cmd cmd, void *vmsg);
> +int peci_client_rd_pkg_cfg_cmd(struct peci_mfd *mfd, u8 mbx_idx,
> + u16 param, u8 *data);
> +
> +#endif /* __LINUX_MFD_PECI_CLIENT_H */

--
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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