1 files changed, 659 insertions, 0 deletions

diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
new file mode 100644
index 00000000000..4e3cba6da3f
--- /dev/null
+++ b/drivers/misc/mei/interrupt.c
@@ -0,0 +1,659 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+
+#include <linux/export.h>
+#include <linux/pci.h>
+#include <linux/kthread.h>
+#include <linux/interrupt.h>
+#include <linux/fs.h>
+#include <linux/jiffies.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+#include "client.h"
+
+
+/**
+ * mei_irq_compl_handler - dispatch complete handlers
+ *	for the completed callbacks
+ *
+ * @dev - mei device
+ * @compl_list - list of completed cbs
+ */
+void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *compl_list)
+{
+	struct mei_cl_cb *cb, *next;
+	struct mei_cl *cl;
+
+	list_for_each_entry_safe(cb, next, &compl_list->list, list) {
+		cl = cb->cl;
+		list_del(&cb->list);
+		if (!cl)
+			continue;
+
+		dev_dbg(&dev->pdev->dev, "completing call back.\n");
+		if (cl == &dev->iamthif_cl)
+			mei_amthif_complete(dev, cb);
+		else
+			mei_cl_complete(cl, cb);
+	}
+}
+EXPORT_SYMBOL_GPL(mei_irq_compl_handler);
+
+/**
+ * mei_cl_hbm_equal - check if hbm is addressed to the client
+ *
+ * @cl: host client
+ * @mei_hdr: header of mei client message
+ *
+ * returns true if matches, false otherwise
+ */
+static inline int mei_cl_hbm_equal(struct mei_cl *cl,
+			struct mei_msg_hdr *mei_hdr)
+{
+	return cl->host_client_id == mei_hdr->host_addr &&
+		cl->me_client_id == mei_hdr->me_addr;
+}
+/**
+ * mei_cl_is_reading - checks if the client
+		is the one to read this message
+ *
+ * @cl: mei client
+ * @mei_hdr: header of mei message
+ *
+ * returns true on match and false otherwise
+ */
+static bool mei_cl_is_reading(struct mei_cl *cl, struct mei_msg_hdr *mei_hdr)
+{
+	return mei_cl_hbm_equal(cl, mei_hdr) &&
+		cl->state == MEI_FILE_CONNECTED &&
+		cl->reading_state != MEI_READ_COMPLETE;
+}
+
+/**
+ * mei_irq_read_client_message - process client message
+ *
+ * @dev: the device structure
+ * @mei_hdr: header of mei client message
+ * @complete_list: An instance of our list structure
+ *
+ * returns 0 on success, <0 on failure.
+ */
+static int mei_cl_irq_read_msg(struct mei_device *dev,
+			       struct mei_msg_hdr *mei_hdr,
+			       struct mei_cl_cb *complete_list)
+{
+	struct mei_cl *cl;
+	struct mei_cl_cb *cb, *next;
+	unsigned char *buffer = NULL;
+
+	list_for_each_entry_safe(cb, next, &dev->read_list.list, list) {
+		cl = cb->cl;
+		if (!cl || !mei_cl_is_reading(cl, mei_hdr))
+			continue;
+
+		cl->reading_state = MEI_READING;
+
+		if (cb->response_buffer.size == 0 ||
+		    cb->response_buffer.data == NULL) {
+			cl_err(dev, cl, "response buffer is not allocated.\n");
+			list_del(&cb->list);
+			return -ENOMEM;
+		}
+
+		if (cb->response_buffer.size < mei_hdr->length + cb->buf_idx) {
+			cl_dbg(dev, cl, "message overflow. size %d len %d idx %ld\n",
+				cb->response_buffer.size,
+				mei_hdr->length, cb->buf_idx);
+			buffer = krealloc(cb->response_buffer.data,
+					  mei_hdr->length + cb->buf_idx,
+					  GFP_KERNEL);
+
+			if (!buffer) {
+				cl_err(dev, cl, "allocation failed.\n");
+				list_del(&cb->list);
+				return -ENOMEM;
+			}
+			cb->response_buffer.data = buffer;
+			cb->response_buffer.size =
+				mei_hdr->length + cb->buf_idx;
+		}
+
+		buffer = cb->response_buffer.data + cb->buf_idx;
+		mei_read_slots(dev, buffer, mei_hdr->length);
+
+		cb->buf_idx += mei_hdr->length;
+		if (mei_hdr->msg_complete) {
+			cl->status = 0;
+			list_del(&cb->list);
+			cl_dbg(dev, cl, "completed read length = %lu\n",
+				cb->buf_idx);
+			list_add_tail(&cb->list, &complete_list->list);
+		}
+		break;
+	}
+
+	dev_dbg(&dev->pdev->dev, "message read\n");
+	if (!buffer) {
+		mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
+		dev_dbg(&dev->pdev->dev, "discarding message " MEI_HDR_FMT "\n",
+				MEI_HDR_PRM(mei_hdr));
+	}
+
+	return 0;
+}
+
+/**
+ * mei_cl_irq_disconnect_rsp - send disconnection response message
+ *
+ * @cl: client
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int mei_cl_irq_disconnect_rsp(struct mei_cl *cl, struct mei_cl_cb *cb,
+				     struct mei_cl_cb *cmpl_list)
+{
+	struct mei_device *dev = cl->dev;
+	u32 msg_slots;
+	int slots;
+	int ret;
+
+	slots = mei_hbuf_empty_slots(dev);
+	msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_response));
+
+	if (slots < msg_slots)
+		return -EMSGSIZE;
+
+	ret = mei_hbm_cl_disconnect_rsp(dev, cl);
+
+	cl->state = MEI_FILE_DISCONNECTED;
+	cl->status = 0;
+	list_del(&cb->list);
+	mei_io_cb_free(cb);
+
+	return ret;
+}
+
+
+
+/**
+ * mei_cl_irq_close - processes close related operation from
+ *	interrupt thread context - send disconnect request
+ *
+ * @cl: client
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int mei_cl_irq_close(struct mei_cl *cl, struct mei_cl_cb *cb,
+			    struct mei_cl_cb *cmpl_list)
+{
+	struct mei_device *dev = cl->dev;
+	u32 msg_slots;
+	int slots;
+
+	msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
+	slots = mei_hbuf_empty_slots(dev);
+
+	if (slots < msg_slots)
+		return -EMSGSIZE;
+
+	if (mei_hbm_cl_disconnect_req(dev, cl)) {
+		cl->status = 0;
+		cb->buf_idx = 0;
+		list_move_tail(&cb->list, &cmpl_list->list);
+		return -EIO;
+	}
+
+	cl->state = MEI_FILE_DISCONNECTING;
+	cl->status = 0;
+	cb->buf_idx = 0;
+	list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
+	cl->timer_count = MEI_CONNECT_TIMEOUT;
+
+	return 0;
+}
+
+
+/**
+ * mei_cl_irq_close - processes client read related operation from the
+ *	interrupt thread context - request for flow control credits
+ *
+ * @cl: client
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
+			   struct mei_cl_cb *cmpl_list)
+{
+	struct mei_device *dev = cl->dev;
+	u32 msg_slots;
+	int slots;
+	int ret;
+
+	msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
+	slots = mei_hbuf_empty_slots(dev);
+
+	if (slots < msg_slots)
+		return -EMSGSIZE;
+
+	ret = mei_hbm_cl_flow_control_req(dev, cl);
+	if (ret) {
+		cl->status = ret;
+		cb->buf_idx = 0;
+		list_move_tail(&cb->list, &cmpl_list->list);
+		return ret;
+	}
+
+	list_move_tail(&cb->list, &dev->read_list.list);
+
+	return 0;
+}
+
+
+/**
+ * mei_cl_irq_connect - send connect request in irq_thread context
+ *
+ * @cl: client
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
+			      struct mei_cl_cb *cmpl_list)
+{
+	struct mei_device *dev = cl->dev;
+	u32 msg_slots;
+	int slots;
+	int ret;
+
+	msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
+	slots = mei_hbuf_empty_slots(dev);
+
+	if (mei_cl_is_other_connecting(cl))
+		return 0;
+
+	if (slots < msg_slots)
+		return -EMSGSIZE;
+
+	cl->state = MEI_FILE_CONNECTING;
+
+	ret = mei_hbm_cl_connect_req(dev, cl);
+	if (ret) {
+		cl->status = ret;
+		cb->buf_idx = 0;
+		list_del(&cb->list);
+		return ret;
+	}
+
+	list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
+	cl->timer_count = MEI_CONNECT_TIMEOUT;
+	return 0;
+}
+
+
+/**
+ * mei_irq_read_handler - bottom half read routine after ISR to
+ * handle the read processing.
+ *
+ * @dev: the device structure
+ * @cmpl_list: An instance of our list structure
+ * @slots: slots to read.
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_irq_read_handler(struct mei_device *dev,
+		struct mei_cl_cb *cmpl_list, s32 *slots)
+{
+	struct mei_msg_hdr *mei_hdr;
+	struct mei_cl *cl;
+	int ret;
+
+	if (!dev->rd_msg_hdr) {
+		dev->rd_msg_hdr = mei_read_hdr(dev);
+		(*slots)--;
+		dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
+	}
+	mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
+	dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
+
+	if (mei_hdr->reserved || !dev->rd_msg_hdr) {
+		dev_err(&dev->pdev->dev, "corrupted message header 0x%08X\n",
+				dev->rd_msg_hdr);
+		ret = -EBADMSG;
+		goto end;
+	}
+
+	if (mei_slots2data(*slots) < mei_hdr->length) {
+		dev_err(&dev->pdev->dev, "less data available than length=%08x.\n",
+				*slots);
+		/* we can't read the message */
+		ret = -ENODATA;
+		goto end;
+	}
+
+	/*  HBM message */
+	if (mei_hdr->host_addr == 0 && mei_hdr->me_addr == 0) {
+		ret = mei_hbm_dispatch(dev, mei_hdr);
+		if (ret) {
+			dev_dbg(&dev->pdev->dev, "mei_hbm_dispatch failed ret = %d\n",
+					ret);
+			goto end;
+		}
+		goto reset_slots;
+	}
+
+	/* find recipient cl */
+	list_for_each_entry(cl, &dev->file_list, link) {
+		if (mei_cl_hbm_equal(cl, mei_hdr)) {
+			cl_dbg(dev, cl, "got a message\n");
+			break;
+		}
+	}
+
+	/* if no recipient cl was found we assume corrupted header */
+	if (&cl->link == &dev->file_list) {
+		dev_err(&dev->pdev->dev, "no destination client found 0x%08X\n",
+				dev->rd_msg_hdr);
+		ret = -EBADMSG;
+		goto end;
+	}
+
+	if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
+	    MEI_FILE_CONNECTED == dev->iamthif_cl.state &&
+	    dev->iamthif_state == MEI_IAMTHIF_READING) {
+
+		ret = mei_amthif_irq_read_msg(dev, mei_hdr, cmpl_list);
+		if (ret) {
+			dev_err(&dev->pdev->dev, "mei_amthif_irq_read_msg failed = %d\n",
+					ret);
+			goto end;
+		}
+	} else {
+		ret = mei_cl_irq_read_msg(dev, mei_hdr, cmpl_list);
+		if (ret) {
+			dev_err(&dev->pdev->dev, "mei_cl_irq_read_msg failed = %d\n",
+					ret);
+			goto end;
+		}
+	}
+
+reset_slots:
+	/* reset the number of slots and header */
+	*slots = mei_count_full_read_slots(dev);
+	dev->rd_msg_hdr = 0;
+
+	if (*slots == -EOVERFLOW) {
+		/* overflow - reset */
+		dev_err(&dev->pdev->dev, "resetting due to slots overflow.\n");
+		/* set the event since message has been read */
+		ret = -ERANGE;
+		goto end;
+	}
+end:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(mei_irq_read_handler);
+
+
+/**
+ * mei_irq_write_handler -  dispatch write requests
+ *  after irq received
+ *
+ * @dev: the device structure
+ * @cmpl_list: An instance of our list structure
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
+{
+
+	struct mei_cl *cl;
+	struct mei_cl_cb *cb, *next;
+	struct mei_cl_cb *list;
+	s32 slots;
+	int ret;
+
+
+	if (!mei_hbuf_acquire(dev))
+		return 0;
+
+	slots = mei_hbuf_empty_slots(dev);
+	if (slots <= 0)
+		return -EMSGSIZE;
+
+	/* complete all waiting for write CB */
+	dev_dbg(&dev->pdev->dev, "complete all waiting for write cb.\n");
+
+	list = &dev->write_waiting_list;
+	list_for_each_entry_safe(cb, next, &list->list, list) {
+		cl = cb->cl;
+		if (cl == NULL)
+			continue;
+
+		cl->status = 0;
+		list_del(&cb->list);
+		if (cb->fop_type == MEI_FOP_WRITE &&
+		    cl != &dev->iamthif_cl) {
+			cl_dbg(dev, cl, "MEI WRITE COMPLETE\n");
+			cl->writing_state = MEI_WRITE_COMPLETE;
+			list_add_tail(&cb->list, &cmpl_list->list);
+		}
+		if (cl == &dev->iamthif_cl) {
+			cl_dbg(dev, cl, "check iamthif flow control.\n");
+			if (dev->iamthif_flow_control_pending) {
+				ret = mei_amthif_irq_read(dev, &slots);
+				if (ret)
+					return ret;
+			}
+		}
+	}
+
+	if (dev->wd_state == MEI_WD_STOPPING) {
+		dev->wd_state = MEI_WD_IDLE;
+		wake_up(&dev->wait_stop_wd);
+	}
+
+	if (mei_cl_is_connected(&dev->wd_cl)) {
+		if (dev->wd_pending &&
+		    mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
+			ret = mei_wd_send(dev);
+			if (ret)
+				return ret;
+			dev->wd_pending = false;
+		}
+	}
+
+	/* complete control write list CB */
+	dev_dbg(&dev->pdev->dev, "complete control write list cb.\n");
+	list_for_each_entry_safe(cb, next, &dev->ctrl_wr_list.list, list) {
+		cl = cb->cl;
+		if (!cl) {
+			list_del(&cb->list);
+			return -ENODEV;
+		}
+		switch (cb->fop_type) {
+		case MEI_FOP_CLOSE:
+			/* send disconnect message */
+			ret = mei_cl_irq_close(cl, cb, cmpl_list);
+			if (ret)
+				return ret;
+
+			break;
+		case MEI_FOP_READ:
+			/* send flow control message */
+			ret = mei_cl_irq_read(cl, cb, cmpl_list);
+			if (ret)
+				return ret;
+
+			break;
+		case MEI_FOP_CONNECT:
+			/* connect message */
+			ret = mei_cl_irq_connect(cl, cb, cmpl_list);
+			if (ret)
+				return ret;
+
+			break;
+		case MEI_FOP_DISCONNECT_RSP:
+			/* send disconnect resp */
+			ret = mei_cl_irq_disconnect_rsp(cl, cb, cmpl_list);
+			if (ret)
+				return ret;
+			break;
+		default:
+			BUG();
+		}
+
+	}
+	/* complete  write list CB */
+	dev_dbg(&dev->pdev->dev, "complete write list cb.\n");
+	list_for_each_entry_safe(cb, next, &dev->write_list.list, list) {
+		cl = cb->cl;
+		if (cl == NULL)
+			continue;
+		if (cl == &dev->iamthif_cl)
+			ret = mei_amthif_irq_write(cl, cb, cmpl_list);
+		else
+			ret = mei_cl_irq_write(cl, cb, cmpl_list);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mei_irq_write_handler);
+
+
+
+/**
+ * mei_timer - timer function.
+ *
+ * @work: pointer to the work_struct structure
+ *
+ */
+void mei_timer(struct work_struct *work)
+{
+	unsigned long timeout;
+	struct mei_cl *cl;
+	struct mei_cl_cb  *cb_pos = NULL;
+	struct mei_cl_cb  *cb_next = NULL;
+
+	struct mei_device *dev = container_of(work,
+					struct mei_device, timer_work.work);
+
+
+	mutex_lock(&dev->device_lock);
+
+	/* Catch interrupt stalls during HBM init handshake */
+	if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
+	    dev->hbm_state != MEI_HBM_IDLE) {
+
+		if (dev->init_clients_timer) {
+			if (--dev->init_clients_timer == 0) {
+				dev_err(&dev->pdev->dev, "timer: init clients timeout hbm_state = %d.\n",
+					dev->hbm_state);
+				mei_reset(dev);
+				goto out;
+			}
+		}
+	}
+
+	if (dev->dev_state != MEI_DEV_ENABLED)
+		goto out;
+
+	/*** connect/disconnect timeouts ***/
+	list_for_each_entry(cl, &dev->file_list, link) {
+		if (cl->timer_count) {
+			if (--cl->timer_count == 0) {
+				dev_err(&dev->pdev->dev, "timer: connect/disconnect timeout.\n");
+				mei_reset(dev);
+				goto out;
+			}
+		}
+	}
+
+	if (!mei_cl_is_connected(&dev->iamthif_cl))
+		goto out;
+
+	if (dev->iamthif_stall_timer) {
+		if (--dev->iamthif_stall_timer == 0) {
+			dev_err(&dev->pdev->dev, "timer: amthif  hanged.\n");
+			mei_reset(dev);
+			dev->iamthif_msg_buf_size = 0;
+			dev->iamthif_msg_buf_index = 0;
+			dev->iamthif_canceled = false;
+			dev->iamthif_ioctl = true;
+			dev->iamthif_state = MEI_IAMTHIF_IDLE;
+			dev->iamthif_timer = 0;
+
+			mei_io_cb_free(dev->iamthif_current_cb);
+			dev->iamthif_current_cb = NULL;
+
+			dev->iamthif_file_object = NULL;
+			mei_amthif_run_next_cmd(dev);
+		}
+	}
+
+	if (dev->iamthif_timer) {
+
+		timeout = dev->iamthif_timer +
+			mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
+
+		dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
+				dev->iamthif_timer);
+		dev_dbg(&dev->pdev->dev, "timeout = %ld\n", timeout);
+		dev_dbg(&dev->pdev->dev, "jiffies = %ld\n", jiffies);
+		if (time_after(jiffies, timeout)) {
+			/*
+			 * User didn't read the AMTHI data on time (15sec)
+			 * freeing AMTHI for other requests
+			 */
+
+			dev_dbg(&dev->pdev->dev, "freeing AMTHI for other requests\n");
+
+			list_for_each_entry_safe(cb_pos, cb_next,
+				&dev->amthif_rd_complete_list.list, list) {
+
+				cl = cb_pos->file_object->private_data;
+
+				/* Finding the AMTHI entry. */
+				if (cl == &dev->iamthif_cl)
+					list_del(&cb_pos->list);
+			}
+			mei_io_cb_free(dev->iamthif_current_cb);
+			dev->iamthif_current_cb = NULL;
+
+			dev->iamthif_file_object->private_data = NULL;
+			dev->iamthif_file_object = NULL;
+			dev->iamthif_timer = 0;
+			mei_amthif_run_next_cmd(dev);
+
+		}
+	}
+out:
+	if (dev->dev_state != MEI_DEV_DISABLED)
+		schedule_delayed_work(&dev->timer_work, 2 * HZ);
+	mutex_unlock(&dev->device_lock);
+}
+