Thank you Corey!
-----Original Message-----
From: Corey Minyard <tcminyard@xxxxxxxxx> On Behalf Of Corey Minyard
Sent: Monday, June 10, 2019 3:51 PM
To: Asmaa Mnebhi <Asmaa@xxxxxxxxxxxx>
Cc: wsa@xxxxxxxxxxxxx; Vadim Pasternak <vadimp@xxxxxxxxxxxx>; Michael Shych <michaelsh@xxxxxxxxxxxx>; rdunlap@xxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-i2c@xxxxxxxxxxxxxxx
Subject: Re: [PATCH v12 1/1] Add support for IPMB driver
On Mon, Jun 10, 2019 at 02:57:02PM -0400, Asmaa Mnebhi wrote:
> Support receiving IPMB requests on a Satellite MC from the BMC.
> Once a response is ready, this driver will send back a response to the
> BMC via the IPMB channel.
Ok, you have been patient enough on this, and I think it's good now :). I've added it to the IPMI for-next tree.
I did move the config section to outside the CONFIG_IPMI_MSGHANLDER section, as it's not dependent on that option.
-corey
>
> Signed-off-by: Asmaa Mnebhi <Asmaa@xxxxxxxxxxxx>
> Acked-by: vadimp@xxxxxxxxxxxx
> ---
> Documentation/IPMB.txt | 103 +++++++++++
> drivers/char/ipmi/Kconfig | 8 +
> drivers/char/ipmi/Makefile | 1 +
> drivers/char/ipmi/ipmb_dev_int.c | 364
> +++++++++++++++++++++++++++++++++++++++
> 4 files changed, 476 insertions(+)
> create mode 100644 Documentation/IPMB.txt create mode 100644
> drivers/char/ipmi/ipmb_dev_int.c
>
> diff --git a/Documentation/IPMB.txt b/Documentation/IPMB.txt new file
> mode 100644 index 0000000..7160d53
> --- /dev/null
> +++ b/Documentation/IPMB.txt
> @@ -0,0 +1,103 @@
> +==============================
> +IPMB Driver for a Satellite MC
> +==============================
> +
> +The Intelligent Platform Management Bus or IPMB, is an I2C bus that
> +provides a standardized interconnection between different boards
> +within a chassis. This interconnection is between the baseboard
> +management (BMC) and chassis electronics.
> +IPMB is also associated with the messaging protocol through the IPMB
> +bus.
> +
> +The devices using the IPMB are usually management controllers that
> +perform management functions such as servicing the front panel
> +interface, monitoring the baseboard, hot-swapping disk drivers in the
> +system chassis, etc...
> +
> +When an IPMB is implemented in the system, the BMC serves as a
> +controller to give system software access to the IPMB. The BMC sends
> +IPMI requests to a device (usually a Satellite Management Controller
> +or Satellite MC) via IPMB and the device sends a response back to the
> +BMC.
> +
> +For more information on IPMB and the format of an IPMB message, refer
> +to the IPMB and IPMI specifications.
> +
> +IPMB driver for Satellite MC
> +----------------------------
> +
> +ipmb-dev-int - This is the driver needed on a Satellite MC to receive
> +IPMB messages from a BMC and send a response back.
> +This driver works with the I2C driver and a userspace program such as
> +OpenIPMI:
> +
> +1) It is an I2C slave backend driver. So, it defines a callback
> +function to set the Satellite MC as an I2C slave.
> +This callback function handles the received IPMI requests.
> +
> +2) It defines the read and write functions to enable a user space
> +program (such as OpenIPMI) to communicate with the kernel.
> +
> +
> +Load the IPMB driver
> +--------------------
> +
> +The driver needs to be loaded at boot time or manually first.
> +First, make sure you have the following in your config file:
> +CONFIG_IPMB_DEVICE_INTERFACE=y
> +
> +1) If you want the driver to be loaded at boot time:
> +
> +a) Add this entry to your ACPI table, under the appropriate SMBus:
> +
> +Device (SMB0) // Example SMBus host controller {
> + Name (_HID, "<Vendor-Specific HID>") // Vendor-Specific HID
> + Name (_UID, 0) // Unique ID of particular host controller
> + :
> + :
> + Device (IPMB)
> + {
> + Name (_HID, "IPMB0001") // IPMB device interface
> + Name (_UID, 0) // Unique device identifier
> + }
> +}
> +
> +b) Example for device tree:
> +
> +&i2c2 {
> + status = "okay";
> +
> + ipmb@10 {
> + compatible = "ipmb-dev";
> + reg = <0x10>;
> + };
> +};
> +
> +2) Manually from Linux:
> +modprobe ipmb-dev-int
> +
> +
> +Instantiate the device
> +----------------------
> +
> +After loading the driver, you can instantiate the device as described
> +in 'Documentation/i2c/instantiating-devices'.
> +If you have multiple BMCs, each connected to your Satellite MC via a
> +different I2C bus, you can instantiate a device for each of those
> +BMCs.
> +The name of the instantiated device contains the I2C bus number
> +associated with it as follows:
> +
> +BMC1 ------ IPMB/I2C bus 1 ---------| /dev/ipmb-1
> + Satellite MC
> +BMC1 ------ IPMB/I2C bus 2 ---------| /dev/ipmb-2
> +
> +For instance, you can instantiate the ipmb-dev-int device from user
> +space at the 7 bit address 0x10 on bus 2:
> +
> + # echo ipmb-dev 0x1010 > /sys/bus/i2c/devices/i2c-2/new_device
> +
> +This will create the device file /dev/ipmb-2, which can be accessed
> +by the user space program. The device needs to be instantiated before
> +running the user space program.
> diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig
> index caac5d2..811fccb 100644
> --- a/drivers/char/ipmi/Kconfig
> +++ b/drivers/char/ipmi/Kconfig
> @@ -75,6 +75,14 @@ config IPMI_SSIF
> have a driver that must be accessed over an I2C bus instead of a
> standard interface. This module requires I2C support.
>
> +config IPMB_DEVICE_INTERFACE
> + tristate 'IPMB Interface handler'
> + depends on I2C_SLAVE
> + help
> + Provides a driver for a device (Satellite MC) to
> + receive requests and send responses back to the BMC via
> + the IPMB interface. This module requires I2C support.
> +
> config IPMI_POWERNV
> depends on PPC_POWERNV
> tristate 'POWERNV (OPAL firmware) IPMI interface'
> diff --git a/drivers/char/ipmi/Makefile b/drivers/char/ipmi/Makefile
> index 3f06b20..0822adc 100644
> --- a/drivers/char/ipmi/Makefile
> +++ b/drivers/char/ipmi/Makefile
> @@ -26,3 +26,4 @@ obj-$(CONFIG_IPMI_KCS_BMC) += kcs_bmc.o
> obj-$(CONFIG_ASPEED_BT_IPMI_BMC) += bt-bmc.o
> obj-$(CONFIG_ASPEED_KCS_IPMI_BMC) += kcs_bmc_aspeed.o
> obj-$(CONFIG_NPCM7XX_KCS_IPMI_BMC) += kcs_bmc_npcm7xx.o
> +obj-$(CONFIG_IPMB_DEVICE_INTERFACE) += ipmb_dev_int.o
> diff --git a/drivers/char/ipmi/ipmb_dev_int.c
> b/drivers/char/ipmi/ipmb_dev_int.c
> new file mode 100644
> index 0000000..2895abf
> --- /dev/null
> +++ b/drivers/char/ipmi/ipmb_dev_int.c
> @@ -0,0 +1,364 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * IPMB driver to receive a request and send a response
> + *
> + * Copyright (C) 2019 Mellanox Techologies, Ltd.
> + *
> + * This was inspired by Brendan Higgins' ipmi-bmc-bt-i2c driver.
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/errno.h>
> +#include <linux/i2c.h>
> +#include <linux/miscdevice.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/poll.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +#include <linux/wait.h>
> +
> +#define MAX_MSG_LEN 128
> +#define IPMB_REQUEST_LEN_MIN 7
> +#define NETFN_RSP_BIT_MASK 0x4
> +#define REQUEST_QUEUE_MAX_LEN 256
> +
> +#define IPMB_MSG_LEN_IDX 0
> +#define RQ_SA_8BIT_IDX 1
> +#define NETFN_LUN_IDX 2
> +
> +#define GET_7BIT_ADDR(addr_8bit) (addr_8bit >> 1)
> +#define GET_8BIT_ADDR(addr_7bit) ((addr_7bit << 1) & 0xff)
> +
> +#define IPMB_MSG_PAYLOAD_LEN_MAX (MAX_MSG_LEN - IPMB_REQUEST_LEN_MIN
> +- 1)
> +
> +#define SMBUS_MSG_HEADER_LENGTH 2
> +#define SMBUS_MSG_IDX_OFFSET (SMBUS_MSG_HEADER_LENGTH + 1)
> +
> +struct ipmb_msg {
> + u8 len;
> + u8 rs_sa;
> + u8 netfn_rs_lun;
> + u8 checksum1;
> + u8 rq_sa;
> + u8 rq_seq_rq_lun;
> + u8 cmd;
> + u8 payload[IPMB_MSG_PAYLOAD_LEN_MAX];
> + /* checksum2 is included in payload */ } __packed;
> +
> +struct ipmb_request_elem {
> + struct list_head list;
> + struct ipmb_msg request;
> +};
> +
> +struct ipmb_dev {
> + struct i2c_client *client;
> + struct miscdevice miscdev;
> + struct ipmb_msg request;
> + struct list_head request_queue;
> + atomic_t request_queue_len;
> + size_t msg_idx;
> + spinlock_t lock;
> + wait_queue_head_t wait_queue;
> + struct mutex file_mutex;
> +};
> +
> +static inline struct ipmb_dev *to_ipmb_dev(struct file *file) {
> + return container_of(file->private_data, struct ipmb_dev, miscdev); }
> +
> +static ssize_t ipmb_read(struct file *file, char __user *buf, size_t count,
> + loff_t *ppos)
> +{
> + struct ipmb_dev *ipmb_dev = to_ipmb_dev(file);
> + struct ipmb_request_elem *queue_elem;
> + struct ipmb_msg msg;
> + ssize_t ret;
> +
> + memset(&msg, 0, sizeof(msg));
> +
> + spin_lock_irq(&ipmb_dev->lock);
> +
> + while (list_empty(&ipmb_dev->request_queue)) {
> + spin_unlock_irq(&ipmb_dev->lock);
> +
> + if (file->f_flags & O_NONBLOCK)
> + return -EAGAIN;
> +
> + ret = wait_event_interruptible(ipmb_dev->wait_queue,
> + !list_empty(&ipmb_dev->request_queue));
> + if (ret)
> + return ret;
> +
> + spin_lock_irq(&ipmb_dev->lock);
> + }
> +
> + queue_elem = list_first_entry(&ipmb_dev->request_queue,
> + struct ipmb_request_elem, list);
> + memcpy(&msg, &queue_elem->request, sizeof(msg));
> + list_del(&queue_elem->list);
> + kfree(queue_elem);
> + atomic_dec(&ipmb_dev->request_queue_len);
> +
> + spin_unlock_irq(&ipmb_dev->lock);
> +
> + count = min_t(size_t, count, msg.len + 1);
> + if (copy_to_user(buf, &msg, count))
> + ret = -EFAULT;
> +
> + return ret < 0 ? ret : count;
> +}
> +
> +static ssize_t ipmb_write(struct file *file, const char __user *buf,
> + size_t count, loff_t *ppos)
> +{
> + struct ipmb_dev *ipmb_dev = to_ipmb_dev(file);
> + u8 rq_sa, netf_rq_lun, msg_len;
> + struct i2c_client rq_client;
> + u8 msg[MAX_MSG_LEN];
> + ssize_t ret;
> +
> + if (count > sizeof(msg))
> + return -EINVAL;
> +
> + if (copy_from_user(&msg, buf, count))
> + return -EFAULT;
> +
> + if (count < msg[0])
> + return -EINVAL;
> +
> + rq_sa = GET_7BIT_ADDR(msg[RQ_SA_8BIT_IDX]);
> + netf_rq_lun = msg[NETFN_LUN_IDX];
> +
> + if (!(netf_rq_lun & NETFN_RSP_BIT_MASK))
> + return -EINVAL;
> +
> + /*
> + * subtract rq_sa and netf_rq_lun from the length of the msg passed to
> + * i2c_smbus_write_block_data_local
> + */
> + msg_len = msg[IPMB_MSG_LEN_IDX] - SMBUS_MSG_HEADER_LENGTH;
> +
> + strcpy(rq_client.name, "ipmb_requester");
> + rq_client.adapter = ipmb_dev->client->adapter;
> + rq_client.flags = ipmb_dev->client->flags;
> + rq_client.addr = rq_sa;
> +
> + ret = i2c_smbus_write_block_data(&rq_client, netf_rq_lun, msg_len,
> + msg + SMBUS_MSG_IDX_OFFSET);
> +
> + return ret ? : count;
> +}
> +
> +static unsigned int ipmb_poll(struct file *file, poll_table *wait) {
> + struct ipmb_dev *ipmb_dev = to_ipmb_dev(file);
> + unsigned int mask = POLLOUT;
> +
> + mutex_lock(&ipmb_dev->file_mutex);
> + poll_wait(file, &ipmb_dev->wait_queue, wait);
> +
> + if (atomic_read(&ipmb_dev->request_queue_len))
> + mask |= POLLIN;
> + mutex_unlock(&ipmb_dev->file_mutex);
> +
> + return mask;
> +}
> +
> +static const struct file_operations ipmb_fops = {
> + .owner = THIS_MODULE,
> + .read = ipmb_read,
> + .write = ipmb_write,
> + .poll = ipmb_poll,
> +};
> +
> +/* Called with ipmb_dev->lock held. */ static void
> +ipmb_handle_request(struct ipmb_dev *ipmb_dev) {
> + struct ipmb_request_elem *queue_elem;
> +
> + if (atomic_read(&ipmb_dev->request_queue_len) >=
> + REQUEST_QUEUE_MAX_LEN)
> + return;
> +
> + queue_elem = kmalloc(sizeof(*queue_elem), GFP_ATOMIC);
> + if (!queue_elem)
> + return;
> +
> + memcpy(&queue_elem->request, &ipmb_dev->request,
> + sizeof(struct ipmb_msg));
> + list_add(&queue_elem->list, &ipmb_dev->request_queue);
> + atomic_inc(&ipmb_dev->request_queue_len);
> + wake_up_all(&ipmb_dev->wait_queue);
> +}
> +
> +static u8 ipmb_verify_checksum1(struct ipmb_dev *ipmb_dev, u8 rs_sa)
> +{
> + /* The 8 lsb of the sum is 0 when the checksum is valid */
> + return (rs_sa + ipmb_dev->request.netfn_rs_lun +
> + ipmb_dev->request.checksum1);
> +}
> +
> +static bool is_ipmb_request(struct ipmb_dev *ipmb_dev, u8 rs_sa) {
> + if (ipmb_dev->msg_idx >= IPMB_REQUEST_LEN_MIN) {
> + if (ipmb_verify_checksum1(ipmb_dev, rs_sa))
> + return false;
> +
> + /*
> + * Check whether this is an IPMB request or
> + * response.
> + * The 6 MSB of netfn_rs_lun are dedicated to the netfn
> + * while the remaining bits are dedicated to the lun.
> + * If the LSB of the netfn is cleared, it is associated
> + * with an IPMB request.
> + * If the LSB of the netfn is set, it is associated with
> + * an IPMB response.
> + */
> + if (!(ipmb_dev->request.netfn_rs_lun & NETFN_RSP_BIT_MASK))
> + return true;
> + }
> + return false;
> +}
> +
> +/*
> + * The IPMB protocol only supports I2C Writes so there is no need
> + * to support I2C_SLAVE_READ* events.
> + * This i2c callback function only monitors IPMB request messages
> + * and adds them in a queue, so that they can be handled by
> + * receive_ipmb_request.
> + */
> +static int ipmb_slave_cb(struct i2c_client *client,
> + enum i2c_slave_event event, u8 *val) {
> + struct ipmb_dev *ipmb_dev = i2c_get_clientdata(client);
> + u8 *buf = (u8 *)&ipmb_dev->request;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&ipmb_dev->lock, flags);
> + switch (event) {
> + case I2C_SLAVE_WRITE_REQUESTED:
> + memset(&ipmb_dev->request, 0, sizeof(ipmb_dev->request));
> + ipmb_dev->msg_idx = 0;
> +
> + /*
> + * At index 0, ipmb_msg stores the length of msg,
> + * skip it for now.
> + * The len will be populated once the whole
> + * buf is populated.
> + *
> + * The I2C bus driver's responsibility is to pass the
> + * data bytes to the backend driver; it does not
> + * forward the i2c slave address.
> + * Since the first byte in the IPMB message is the
> + * address of the responder, it is the responsibility
> + * of the IPMB driver to format the message properly.
> + * So this driver prepends the address of the responder
> + * to the received i2c data before the request message
> + * is handled in userland.
> + */
> + buf[++ipmb_dev->msg_idx] = GET_8BIT_ADDR(client->addr);
> + break;
> +
> + case I2C_SLAVE_WRITE_RECEIVED:
> + if (ipmb_dev->msg_idx >= sizeof(struct ipmb_msg))
> + break;
> +
> + buf[++ipmb_dev->msg_idx] = *val;
> + break;
> +
> + case I2C_SLAVE_STOP:
> + ipmb_dev->request.len = ipmb_dev->msg_idx;
> +
> + if (is_ipmb_request(ipmb_dev, GET_8BIT_ADDR(client->addr)))
> + ipmb_handle_request(ipmb_dev);
> + break;
> +
> + default:
> + break;
> + }
> + spin_unlock_irqrestore(&ipmb_dev->lock, flags);
> +
> + return 0;
> +}
> +
> +static int ipmb_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct ipmb_dev *ipmb_dev;
> + int ret;
> +
> + ipmb_dev = devm_kzalloc(&client->dev, sizeof(*ipmb_dev),
> + GFP_KERNEL);
> + if (!ipmb_dev)
> + return -ENOMEM;
> +
> + spin_lock_init(&ipmb_dev->lock);
> + init_waitqueue_head(&ipmb_dev->wait_queue);
> + atomic_set(&ipmb_dev->request_queue_len, 0);
> + INIT_LIST_HEAD(&ipmb_dev->request_queue);
> +
> + mutex_init(&ipmb_dev->file_mutex);
> +
> + ipmb_dev->miscdev.minor = MISC_DYNAMIC_MINOR;
> +
> + ipmb_dev->miscdev.name = devm_kasprintf(&client->dev, GFP_KERNEL,
> + "%s%d", "ipmb-",
> + client->adapter->nr);
> + ipmb_dev->miscdev.fops = &ipmb_fops;
> + ipmb_dev->miscdev.parent = &client->dev;
> + ret = misc_register(&ipmb_dev->miscdev);
> + if (ret)
> + return ret;
> +
> + ipmb_dev->client = client;
> + i2c_set_clientdata(client, ipmb_dev);
> + ret = i2c_slave_register(client, ipmb_slave_cb);
> + if (ret) {
> + misc_deregister(&ipmb_dev->miscdev);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int ipmb_remove(struct i2c_client *client) {
> + struct ipmb_dev *ipmb_dev = i2c_get_clientdata(client);
> +
> + i2c_slave_unregister(client);
> + misc_deregister(&ipmb_dev->miscdev);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id ipmb_id[] = {
> + { "ipmb-dev", 0 },
> + {},
> +};
> +MODULE_DEVICE_TABLE(i2c, ipmb_id);
> +
> +static const struct acpi_device_id acpi_ipmb_id[] = {
> + { "IPMB0001", 0 },
> + {},
> +};
> +MODULE_DEVICE_TABLE(acpi, acpi_ipmb_id);
> +
> +static struct i2c_driver ipmb_driver = {
> + .driver = {
> + .owner = THIS_MODULE,
> + .name = "ipmb-dev",
> + .acpi_match_table = ACPI_PTR(acpi_ipmb_id),
> + },
> + .probe = ipmb_probe,
> + .remove = ipmb_remove,
> + .id_table = ipmb_id,
> +};
> +module_i2c_driver(ipmb_driver);
> +
> +MODULE_AUTHOR("Mellanox Technologies"); MODULE_DESCRIPTION("IPMB
> +driver"); MODULE_LICENSE("GPL v2");
> --
> 2.1.2
>
