1 files changed, 583 insertions, 0 deletions

diff --git a/drivers/char/ipmi/ipmi_ipmb.c b/drivers/char/ipmi/ipmi_ipmb.c
new file mode 100644
index 000000000..3f1c9f157
--- /dev/null
+++ b/drivers/char/ipmi/ipmi_ipmb.c
@@ -0,0 +1,583 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Driver to talk to a remote management controller on IPMB.
+ */
+
+#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/semaphore.h>
+#include <linux/kthread.h>
+#include <linux/wait.h>
+#include <linux/ipmi_msgdefs.h>
+#include <linux/ipmi_smi.h>
+
+#define DEVICE_NAME "ipmi-ipmb"
+
+static int bmcaddr = 0x20;
+module_param(bmcaddr, int, 0644);
+MODULE_PARM_DESC(bmcaddr, "Address to use for BMC.");
+
+static unsigned int retry_time_ms = 250;
+module_param(retry_time_ms, uint, 0644);
+MODULE_PARM_DESC(retry_time_ms, "Timeout time between retries, in milliseconds.");
+
+static unsigned int max_retries = 1;
+module_param(max_retries, uint, 0644);
+MODULE_PARM_DESC(max_retries, "Max resends of a command before timing out.");
+
+/* Add room for the two slave addresses, two checksums, and rqSeq. */
+#define IPMB_MAX_MSG_LEN (IPMI_MAX_MSG_LENGTH + 5)
+
+struct ipmi_ipmb_dev {
+	struct ipmi_smi *intf;
+	struct i2c_client *client;
+	struct i2c_client *slave;
+
+	struct ipmi_smi_handlers handlers;
+
+	bool ready;
+
+	u8 curr_seq;
+
+	u8 bmcaddr;
+	u32 retry_time_ms;
+	u32 max_retries;
+
+	struct ipmi_smi_msg *next_msg;
+	struct ipmi_smi_msg *working_msg;
+
+	/* Transmit thread. */
+	struct task_struct *thread;
+	struct semaphore wake_thread;
+	struct semaphore got_rsp;
+	spinlock_t lock;
+	bool stopping;
+
+	u8 xmitmsg[IPMB_MAX_MSG_LEN];
+	unsigned int xmitlen;
+
+	u8 rcvmsg[IPMB_MAX_MSG_LEN];
+	unsigned int rcvlen;
+	bool overrun;
+};
+
+static bool valid_ipmb(struct ipmi_ipmb_dev *iidev)
+{
+	u8 *msg = iidev->rcvmsg;
+	u8 netfn;
+
+	if (iidev->overrun)
+		return false;
+
+	/* Minimum message size. */
+	if (iidev->rcvlen < 7)
+		return false;
+
+	/* Is it a response? */
+	netfn = msg[1] >> 2;
+	if (netfn & 1) {
+		/* Response messages have an added completion code. */
+		if (iidev->rcvlen < 8)
+			return false;
+	}
+
+	if (ipmb_checksum(msg, 3) != 0)
+		return false;
+	if (ipmb_checksum(msg + 3, iidev->rcvlen - 3) != 0)
+		return false;
+
+	return true;
+}
+
+static void ipmi_ipmb_check_msg_done(struct ipmi_ipmb_dev *iidev)
+{
+	struct ipmi_smi_msg *imsg = NULL;
+	u8 *msg = iidev->rcvmsg;
+	bool is_cmd;
+	unsigned long flags;
+
+	if (iidev->rcvlen == 0)
+		return;
+	if (!valid_ipmb(iidev))
+		goto done;
+
+	is_cmd = ((msg[1] >> 2) & 1) == 0;
+
+	if (is_cmd) {
+		/* Ignore commands until we are up. */
+		if (!iidev->ready)
+			goto done;
+
+		/* It's a command, allocate a message for it. */
+		imsg = ipmi_alloc_smi_msg();
+		if (!imsg)
+			goto done;
+		imsg->type = IPMI_SMI_MSG_TYPE_IPMB_DIRECT;
+		imsg->data_size = 0;
+	} else {
+		spin_lock_irqsave(&iidev->lock, flags);
+		if (iidev->working_msg) {
+			u8 seq = msg[4] >> 2;
+			bool xmit_rsp = (iidev->working_msg->data[0] >> 2) & 1;
+
+			/*
+			 * Responses should carry the sequence we sent
+			 * them with.  If it's a transmitted response,
+			 * ignore it.  And if the message hasn't been
+			 * transmitted, ignore it.
+			 */
+			if (!xmit_rsp && seq == iidev->curr_seq) {
+				iidev->curr_seq = (iidev->curr_seq + 1) & 0x3f;
+
+				imsg = iidev->working_msg;
+				iidev->working_msg = NULL;
+			}
+		}
+		spin_unlock_irqrestore(&iidev->lock, flags);
+	}
+
+	if (!imsg)
+		goto done;
+
+	if (imsg->type == IPMI_SMI_MSG_TYPE_IPMB_DIRECT) {
+		imsg->rsp[0] = msg[1]; /* NetFn/LUN */
+		/*
+		 * Keep the source address, rqSeq.  Drop the trailing
+		 * checksum.
+		 */
+		memcpy(imsg->rsp + 1, msg + 3, iidev->rcvlen - 4);
+		imsg->rsp_size = iidev->rcvlen - 3;
+	} else {
+		imsg->rsp[0] = msg[1]; /* NetFn/LUN */
+		/*
+		 * Skip the source address, rqSeq.  Drop the trailing
+		 * checksum.
+		 */
+		memcpy(imsg->rsp + 1, msg + 5, iidev->rcvlen - 6);
+		imsg->rsp_size = iidev->rcvlen - 5;
+	}
+	ipmi_smi_msg_received(iidev->intf, imsg);
+	if (!is_cmd)
+		up(&iidev->got_rsp);
+
+done:
+	iidev->overrun = false;
+	iidev->rcvlen = 0;
+}
+
+/*
+ * The IPMB protocol only supports i2c writes so there is no need to
+ * support I2C_SLAVE_READ* events, except to know if the other end has
+ * issued a read without going to stop mode.
+ */
+static int ipmi_ipmb_slave_cb(struct i2c_client *client,
+			      enum i2c_slave_event event, u8 *val)
+{
+	struct ipmi_ipmb_dev *iidev = i2c_get_clientdata(client);
+
+	switch (event) {
+	case I2C_SLAVE_WRITE_REQUESTED:
+		ipmi_ipmb_check_msg_done(iidev);
+		/*
+		 * First byte is the slave address, to ease the checksum
+		 * calculation.
+		 */
+		iidev->rcvmsg[0] = client->addr << 1;
+		iidev->rcvlen = 1;
+		break;
+
+	case I2C_SLAVE_WRITE_RECEIVED:
+		if (iidev->rcvlen >= sizeof(iidev->rcvmsg))
+			iidev->overrun = true;
+		else
+			iidev->rcvmsg[iidev->rcvlen++] = *val;
+		break;
+
+	case I2C_SLAVE_READ_REQUESTED:
+	case I2C_SLAVE_STOP:
+		ipmi_ipmb_check_msg_done(iidev);
+		break;
+
+	case I2C_SLAVE_READ_PROCESSED:
+		break;
+	}
+
+	return 0;
+}
+
+static void ipmi_ipmb_send_response(struct ipmi_ipmb_dev *iidev,
+				    struct ipmi_smi_msg *msg, u8 cc)
+{
+	if ((msg->data[0] >> 2) & 1) {
+		/*
+		 * It's a response being sent, we need to return a
+		 * response to the response.  Fake a send msg command
+		 * response with channel 0.  This will always be ipmb
+		 * direct.
+		 */
+		msg->data[0] = (IPMI_NETFN_APP_REQUEST | 1) << 2;
+		msg->data[3] = IPMI_SEND_MSG_CMD;
+		msg->data[4] = cc;
+		msg->data_size = 5;
+	}
+	msg->rsp[0] = msg->data[0] | (1 << 2);
+	if (msg->type == IPMI_SMI_MSG_TYPE_IPMB_DIRECT) {
+		msg->rsp[1] = msg->data[1];
+		msg->rsp[2] = msg->data[2];
+		msg->rsp[3] = msg->data[3];
+		msg->rsp[4] = cc;
+		msg->rsp_size = 5;
+	} else {
+		msg->rsp[1] = msg->data[1];
+		msg->rsp[2] = cc;
+		msg->rsp_size = 3;
+	}
+	ipmi_smi_msg_received(iidev->intf, msg);
+}
+
+static void ipmi_ipmb_format_for_xmit(struct ipmi_ipmb_dev *iidev,
+				      struct ipmi_smi_msg *msg)
+{
+	if (msg->type == IPMI_SMI_MSG_TYPE_IPMB_DIRECT) {
+		iidev->xmitmsg[0] = msg->data[1];
+		iidev->xmitmsg[1] = msg->data[0];
+		memcpy(iidev->xmitmsg + 4, msg->data + 2, msg->data_size - 2);
+		iidev->xmitlen = msg->data_size + 2;
+	} else {
+		iidev->xmitmsg[0] = iidev->bmcaddr;
+		iidev->xmitmsg[1] = msg->data[0];
+		iidev->xmitmsg[4] = 0;
+		memcpy(iidev->xmitmsg + 5, msg->data + 1, msg->data_size - 1);
+		iidev->xmitlen = msg->data_size + 4;
+	}
+	iidev->xmitmsg[3] = iidev->slave->addr << 1;
+	if (((msg->data[0] >> 2) & 1) == 0)
+		/* If it's a command, put in our own sequence number. */
+		iidev->xmitmsg[4] = ((iidev->xmitmsg[4] & 0x03) |
+				     (iidev->curr_seq << 2));
+
+	/* Now add on the final checksums. */
+	iidev->xmitmsg[2] = ipmb_checksum(iidev->xmitmsg, 2);
+	iidev->xmitmsg[iidev->xmitlen] =
+		ipmb_checksum(iidev->xmitmsg + 3, iidev->xmitlen - 3);
+	iidev->xmitlen++;
+}
+
+static int ipmi_ipmb_thread(void *data)
+{
+	struct ipmi_ipmb_dev *iidev = data;
+
+	while (!kthread_should_stop()) {
+		long ret;
+		struct i2c_msg i2c_msg;
+		struct ipmi_smi_msg *msg = NULL;
+		unsigned long flags;
+		unsigned int retries = 0;
+
+		/* Wait for a message to send */
+		ret = down_interruptible(&iidev->wake_thread);
+		if (iidev->stopping)
+			break;
+		if (ret)
+			continue;
+
+		spin_lock_irqsave(&iidev->lock, flags);
+		if (iidev->next_msg) {
+			msg = iidev->next_msg;
+			iidev->next_msg = NULL;
+		}
+		spin_unlock_irqrestore(&iidev->lock, flags);
+		if (!msg)
+			continue;
+
+		ipmi_ipmb_format_for_xmit(iidev, msg);
+
+retry:
+		i2c_msg.len = iidev->xmitlen - 1;
+		if (i2c_msg.len > 32) {
+			ipmi_ipmb_send_response(iidev, msg,
+						IPMI_REQ_LEN_EXCEEDED_ERR);
+			continue;
+		}
+
+		i2c_msg.addr = iidev->xmitmsg[0] >> 1;
+		i2c_msg.flags = 0;
+		i2c_msg.buf = iidev->xmitmsg + 1;
+
+		/* Rely on i2c_transfer for a barrier. */
+		iidev->working_msg = msg;
+
+		ret = i2c_transfer(iidev->client->adapter, &i2c_msg, 1);
+
+		if ((msg->data[0] >> 2) & 1) {
+			/*
+			 * It's a response, nothing will be returned
+			 * by the other end.
+			 */
+
+			iidev->working_msg = NULL;
+			ipmi_ipmb_send_response(iidev, msg,
+						ret < 0 ? IPMI_BUS_ERR : 0);
+			continue;
+		}
+		if (ret < 0) {
+			iidev->working_msg = NULL;
+			ipmi_ipmb_send_response(iidev, msg, IPMI_BUS_ERR);
+			continue;
+		}
+
+		/* A command was sent, wait for its response. */
+		ret = down_timeout(&iidev->got_rsp,
+				   msecs_to_jiffies(iidev->retry_time_ms));
+
+		/*
+		 * Grab the message if we can.  If the handler hasn't
+		 * already handled it, the message will still be there.
+		 */
+		spin_lock_irqsave(&iidev->lock, flags);
+		msg = iidev->working_msg;
+		iidev->working_msg = NULL;
+		spin_unlock_irqrestore(&iidev->lock, flags);
+
+		if (!msg && ret) {
+			/*
+			 * If working_msg is not set and we timed out,
+			 * that means the message grabbed by
+			 * check_msg_done before we could grab it
+			 * here.  Wait again for check_msg_done to up
+			 * the semaphore.
+			 */
+			down(&iidev->got_rsp);
+		} else if (msg && ++retries <= iidev->max_retries) {
+			spin_lock_irqsave(&iidev->lock, flags);
+			iidev->working_msg = msg;
+			spin_unlock_irqrestore(&iidev->lock, flags);
+			goto retry;
+		}
+
+		if (msg)
+			ipmi_ipmb_send_response(iidev, msg, IPMI_TIMEOUT_ERR);
+	}
+
+	if (iidev->next_msg)
+		/* Return an unspecified error. */
+		ipmi_ipmb_send_response(iidev, iidev->next_msg, 0xff);
+
+	return 0;
+}
+
+static int ipmi_ipmb_start_processing(void *send_info,
+				      struct ipmi_smi *new_intf)
+{
+	struct ipmi_ipmb_dev *iidev = send_info;
+
+	iidev->intf = new_intf;
+	iidev->ready = true;
+	return 0;
+}
+
+static void ipmi_ipmb_stop_thread(struct ipmi_ipmb_dev *iidev)
+{
+	if (iidev->thread) {
+		struct task_struct *t = iidev->thread;
+
+		iidev->thread = NULL;
+		iidev->stopping = true;
+		up(&iidev->wake_thread);
+		up(&iidev->got_rsp);
+		kthread_stop(t);
+	}
+}
+
+static void ipmi_ipmb_shutdown(void *send_info)
+{
+	struct ipmi_ipmb_dev *iidev = send_info;
+
+	ipmi_ipmb_stop_thread(iidev);
+}
+
+static void ipmi_ipmb_sender(void *send_info,
+			     struct ipmi_smi_msg *msg)
+{
+	struct ipmi_ipmb_dev *iidev = send_info;
+	unsigned long flags;
+
+	spin_lock_irqsave(&iidev->lock, flags);
+	BUG_ON(iidev->next_msg);
+
+	iidev->next_msg = msg;
+	spin_unlock_irqrestore(&iidev->lock, flags);
+
+	up(&iidev->wake_thread);
+}
+
+static void ipmi_ipmb_request_events(void *send_info)
+{
+	/* We don't fetch events here. */
+}
+
+static void ipmi_ipmb_cleanup(struct ipmi_ipmb_dev *iidev)
+{
+	if (iidev->slave) {
+		i2c_slave_unregister(iidev->slave);
+		if (iidev->slave != iidev->client)
+			i2c_unregister_device(iidev->slave);
+	}
+	iidev->slave = NULL;
+	iidev->client = NULL;
+	ipmi_ipmb_stop_thread(iidev);
+}
+
+static void ipmi_ipmb_remove(struct i2c_client *client)
+{
+	struct ipmi_ipmb_dev *iidev = i2c_get_clientdata(client);
+
+	ipmi_ipmb_cleanup(iidev);
+	ipmi_unregister_smi(iidev->intf);
+}
+
+static int ipmi_ipmb_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct ipmi_ipmb_dev *iidev;
+	struct device_node *slave_np;
+	struct i2c_adapter *slave_adap = NULL;
+	struct i2c_client *slave = NULL;
+	int rv;
+
+	iidev = devm_kzalloc(&client->dev, sizeof(*iidev), GFP_KERNEL);
+	if (!iidev)
+		return -ENOMEM;
+
+	if (of_property_read_u8(dev->of_node, "bmcaddr", &iidev->bmcaddr) != 0)
+		iidev->bmcaddr = bmcaddr;
+	if (iidev->bmcaddr == 0 || iidev->bmcaddr & 1) {
+		/* Can't have the write bit set. */
+		dev_notice(&client->dev,
+			   "Invalid bmc address value %2.2x\n", iidev->bmcaddr);
+		return -EINVAL;
+	}
+
+	if (of_property_read_u32(dev->of_node, "retry-time",
+				 &iidev->retry_time_ms) != 0)
+		iidev->retry_time_ms = retry_time_ms;
+
+	if (of_property_read_u32(dev->of_node, "max-retries",
+				 &iidev->max_retries) != 0)
+		iidev->max_retries = max_retries;
+
+	slave_np = of_parse_phandle(dev->of_node, "slave-dev", 0);
+	if (slave_np) {
+		slave_adap = of_get_i2c_adapter_by_node(slave_np);
+		of_node_put(slave_np);
+		if (!slave_adap) {
+			dev_notice(&client->dev,
+				   "Could not find slave adapter\n");
+			return -EINVAL;
+		}
+	}
+
+	iidev->client = client;
+
+	if (slave_adap) {
+		struct i2c_board_info binfo;
+
+		memset(&binfo, 0, sizeof(binfo));
+		strscpy(binfo.type, "ipmb-slave", I2C_NAME_SIZE);
+		binfo.addr = client->addr;
+		binfo.flags = I2C_CLIENT_SLAVE;
+		slave = i2c_new_client_device(slave_adap, &binfo);
+		i2c_put_adapter(slave_adap);
+		if (IS_ERR(slave)) {
+			rv = PTR_ERR(slave);
+			dev_notice(&client->dev,
+				   "Could not allocate slave device: %d\n", rv);
+			return rv;
+		}
+		i2c_set_clientdata(slave, iidev);
+	} else {
+		slave = client;
+	}
+	i2c_set_clientdata(client, iidev);
+	slave->flags |= I2C_CLIENT_SLAVE;
+
+	rv = i2c_slave_register(slave, ipmi_ipmb_slave_cb);
+	if (rv)
+		goto out_err;
+	iidev->slave = slave;
+	slave = NULL;
+
+	iidev->handlers.flags = IPMI_SMI_CAN_HANDLE_IPMB_DIRECT;
+	iidev->handlers.start_processing = ipmi_ipmb_start_processing;
+	iidev->handlers.shutdown = ipmi_ipmb_shutdown;
+	iidev->handlers.sender = ipmi_ipmb_sender;
+	iidev->handlers.request_events = ipmi_ipmb_request_events;
+
+	spin_lock_init(&iidev->lock);
+	sema_init(&iidev->wake_thread, 0);
+	sema_init(&iidev->got_rsp, 0);
+
+	iidev->thread = kthread_run(ipmi_ipmb_thread, iidev,
+				    "kipmb%4.4x", client->addr);
+	if (IS_ERR(iidev->thread)) {
+		rv = PTR_ERR(iidev->thread);
+		dev_notice(&client->dev,
+			   "Could not start kernel thread: error %d\n", rv);
+		goto out_err;
+	}
+
+	rv = ipmi_register_smi(&iidev->handlers,
+			       iidev,
+			       &client->dev,
+			       iidev->bmcaddr);
+	if (rv)
+		goto out_err;
+
+	return 0;
+
+out_err:
+	if (slave && slave != client)
+		i2c_unregister_device(slave);
+	ipmi_ipmb_cleanup(iidev);
+	return rv;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id of_ipmi_ipmb_match[] = {
+	{ .type = "ipmi", .compatible = DEVICE_NAME },
+	{},
+};
+MODULE_DEVICE_TABLE(of, of_ipmi_ipmb_match);
+#else
+#define of_ipmi_ipmb_match NULL
+#endif
+
+static const struct i2c_device_id ipmi_ipmb_id[] = {
+	{ DEVICE_NAME, 0 },
+	{},
+};
+MODULE_DEVICE_TABLE(i2c, ipmi_ipmb_id);
+
+static struct i2c_driver ipmi_ipmb_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver = {
+		.name = DEVICE_NAME,
+		.of_match_table = of_ipmi_ipmb_match,
+	},
+	.probe_new	= ipmi_ipmb_probe,
+	.remove		= ipmi_ipmb_remove,
+	.id_table	= ipmi_ipmb_id,
+};
+module_i2c_driver(ipmi_ipmb_driver);
+
+MODULE_AUTHOR("Corey Minyard");
+MODULE_DESCRIPTION("IPMI IPMB driver");
+MODULE_LICENSE("GPL v2");