SCIF module initialization, DMA mapping, ioremap wrapper APIs
and debugfs hooks. SCIF gets probed by the SCIF hardware bus
if SCIF devices were registered by base drivers. A MISC device
is registered to provide the SCIF character device interface.
Reviewed-by: Nikhil Rao <nikhil.rao@xxxxxxxxx>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@xxxxxxxxx>
Signed-off-by: Sudeep Dutt <sudeep.dutt@xxxxxxxxx>
---
drivers/misc/mic/scif/scif_main.h | 252 ++++++++++++++++++++++
drivers/misc/mic/scif/scif_map.h | 113 ++++++++++
drivers/misc/mic/scif/scif_debugfs.c | 85 ++++++++
drivers/misc/mic/scif/scif_main.c | 391 +++++++++++++++++++++++++++++++++++
4 files changed, 841 insertions(+)
create mode 100644 drivers/misc/mic/scif/scif_main.h
create mode 100644 drivers/misc/mic/scif/scif_map.h
create mode 100644 drivers/misc/mic/scif/scif_debugfs.c
create mode 100644 drivers/misc/mic/scif/scif_main.c
diff --git a/drivers/misc/mic/scif/scif_main.h b/drivers/misc/mic/scif/scif_main.h
new file mode 100644
index 0000000..acd1233
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_main.h
@@ -0,0 +1,252 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#ifndef SCIF_MAIN_H
+#define SCIF_MAIN_H
+
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/miscdevice.h>
+#include <linux/dmaengine.h>
+#include <linux/file.h>
+#include <linux/scif.h>
+
+#include "../common/mic_dev.h"
+
+#define SCIF_MGMT_NODE 0
+#define SCIF_DEFAULT_WATCHDOG_TO 30
+#define SCIF_NODE_ACCEPT_TIMEOUT (3 * HZ)
+#define SCIF_NODE_ALIVE_TIMEOUT (SCIF_DEFAULT_WATCHDOG_TO * HZ)
+
+/*
+ * Generic state used for certain node QP message exchanges
+ * like Unregister, Alloc etc.
+ */
+enum scif_msg_state {
+ OP_IDLE = 1,
+ OP_IN_PROGRESS,
+ OP_COMPLETED,
+ OP_FAILED
+};
+
+/*
+ * struct scif_info - Global SCIF information
+ *
+ * @nodeid: Node ID this node is to others
+ * @maxid: Max known node ID
+ * @total: Total number of SCIF nodes
+ * @nr_zombies: number of zombie endpoints
+ * @eplock: Lock to synchronize listening, zombie endpoint lists
+ * @connlock: Lock to synchronize connected and disconnected lists
+ * @nb_connect_lock: Synchronize non blocking connect operations
+ * @port_lock: Synchronize access to SCIF ports
+ * @uaccept: List of user acceptreq waiting for acceptreg
+ * @listen: List of listening end points
+ * @zombie: List of zombie end points with pending RMA's
+ * @connected: List of end points in connected state
+ * @disconnected: List of end points in disconnected state
+ * @nb_connect_list: List for non blocking connections
+ * @misc_work: miscellaneous SCIF tasks
+ * @conflock: Lock to synchronize SCIF node configuration changes
+ * @en_msg_log: Enable debug message logging
+ * @p2p_enable: Enable P2P SCIF network
+ * @mdev: The MISC device
+ * @conn_work: Work for workqueue handling all connections
+ * @exitwq: Wait queue for waiting for an EXIT node QP message response
+ * @loopb_dev: Dummy SCIF device used for loopback
+ * @loopb_wq: Workqueue used for handling loopback messages
+ * @loopb_wqname[16]: Name of loopback workqueue
+ * @loopb_work: Used for submitting work to loopb_wq
+ * @loopb_recv_q: List of messages received on the loopb_wq
+ * @card_initiated_exit: set when the card has initiated the exit
+ */
+struct scif_info {
+ u8 nodeid;
+ u8 maxid;
+ u8 total;
+ u32 nr_zombies;
+ spinlock_t eplock;
+ struct mutex connlock;
+ spinlock_t nb_connect_lock;
+ spinlock_t port_lock;
+ struct list_head uaccept;
+ struct list_head listen;
+ struct list_head zombie;
+ struct list_head connected;
+ struct list_head disconnected;
+ struct list_head nb_connect_list;
+ struct work_struct misc_work;
+ struct mutex conflock;
+ u8 en_msg_log;
+ u8 p2p_enable;
+ struct miscdevice mdev;
+ struct work_struct conn_work;
+ wait_queue_head_t exitwq;
+ struct scif_dev *loopb_dev;
+ struct workqueue_struct *loopb_wq;
+ char loopb_wqname[16];
+ struct work_struct loopb_work;
+ struct list_head loopb_recv_q;
+ bool card_initiated_exit;
+};
+
+/*
+ * struct scif_p2p_info - SCIF mapping information used for P2P
+ *
+ * @ppi_peer_id - SCIF peer node id
+ * @ppi_sg - Scatter list for bar information (One for mmio and one for aper)
+ * @sg_nentries - Number of entries in the scatterlist
+ * @ppi_da: DMA address for MMIO and APER bars
+ * @ppi_len: Length of MMIO and APER bars
+ * @ppi_list: Link in list of mapping information
+ */
+struct scif_p2p_info {
+ u8 ppi_peer_id;
+ struct scatterlist *ppi_sg[2];
+ u64 sg_nentries[2];
+ dma_addr_t ppi_da[2];
+ u64 ppi_len[2];
+#define SCIF_PPI_MMIO 0
+#define SCIF_PPI_APER 1
+ struct list_head ppi_list;
+};
+
+/*
+ * struct scif_dev - SCIF remote device specific fields
+ *
+ * @node: Node id
+ * @p2p: List of P2P mapping information
+ * @qpairs: The node queue pair for exchanging control messages
+ * @intr_wq: Workqueue for handling Node QP messages
+ * @intr_wqname: Name of node QP workqueue for handling interrupts
+ * @intr_bh: Used for submitting work to intr_wq
+ * @lock: Lock used for synchronizing access to the scif device
+ * @sdev: SCIF hardware device on the SCIF hardware bus
+ * @db: doorbell the peer will trigger to generate an interrupt on self
+ * @rdb: Doorbell to trigger on the peer to generate an interrupt on the peer
+ * @cookie: Cookie received while registering the interrupt handler
+ * init_msg_work: work scheduled for SCIF_INIT message processing
+ * @p2p_dwork: Delayed work to enable polling for P2P state
+ * @qp_dwork: Delayed work for enabling polling for remote QP information
+ * @p2p_retry: Number of times to retry polling of P2P state
+ * @base_addr: P2P aperture bar base address
+ * @mic_mw mmio: The peer MMIO information used for P2P
+ * @spdev: SCIF peer device on the SCIF peer bus
+ * @node_remove_ack_pending: True if a node_remove_ack is pending
+ * @exit_ack_pending: true if an exit_ack is pending
+ * @disconn_wq: Used while waiting for a node remove response
+ * @disconn_rescnt: Keeps track of number of node remove requests sent
+ * @exit: Status of exit message
+ * @qp_dma_addr: Queue pair DMA address passed to the peer
+*/
+struct scif_dev {
+ u8 node;
+ struct list_head p2p;
+ struct scif_qp *qpairs;
+ struct workqueue_struct *intr_wq;
+ char intr_wqname[16];
+ struct work_struct intr_bh;
+ struct mutex lock;
+ struct scif_hw_dev *sdev;
+ int db;
+ int rdb;
+ struct mic_irq *cookie;
+ struct work_struct init_msg_work;
+ struct delayed_work p2p_dwork;
+ struct delayed_work qp_dwork;
+ int p2p_retry;
+ dma_addr_t base_addr;
+ struct mic_mw mmio;
+ struct scif_peer_dev __rcu *spdev;
+ bool node_remove_ack_pending;
+ bool exit_ack_pending;
+ wait_queue_head_t disconn_wq;
+ atomic_t disconn_rescnt;
+ enum scif_msg_state exit;
+ dma_addr_t qp_dma_addr;
+};
+
+extern struct scif_info scif_info;
+extern struct idr scif_ports;
+extern struct scif_dev *scif_dev;
+extern const struct file_operations scif_fops;
+
+/* Size of the RB for the Node QP */
+#define SCIF_NODE_QP_SIZE 0x10000
+
+#include "scif_nodeqp.h"
+
+/*
+ * scifdev_self:
+ * @dev: The remote SCIF Device
+ *
+ * Returns true if the SCIF Device passed is the self aka Loopback SCIF device.
+ */
+static inline int scifdev_self(struct scif_dev *dev)
+{
+ return dev->node == scif_info.nodeid;
+}
+
+static inline bool scif_is_mgmt_node(void)
+{
+ return !scif_info.nodeid;
+}
+
+/*
+ * scifdev_is_p2p:
+ * @dev: The remote SCIF Device
+ *
+ * Returns true if the SCIF Device is a MIC Peer to Peer SCIF device.
+ */
+static inline bool scifdev_is_p2p(struct scif_dev *dev)
+{
+ if (scif_is_mgmt_node())
+ return false;
+ else
+ return dev != &scif_dev[SCIF_MGMT_NODE] &&
+ !scifdev_self(dev);
+}
+
+/*
+ * scifdev_alive:
+ * @scifdev: The remote SCIF Device
+ *
+ * Returns true if the remote SCIF Device is running or sleeping for
+ * this endpoint.
+ */
+static inline int _scifdev_alive(struct scif_dev *scifdev)
+{
+ struct scif_peer_dev *spdev;
+
+ rcu_read_lock();
+ spdev = rcu_dereference(scifdev->spdev);
+ rcu_read_unlock();
+ return !!spdev;
+}
+
+void __init scif_init_debugfs(void);
+void scif_exit_debugfs(void);
+int scif_setup_intr_wq(struct scif_dev *scifdev);
+void scif_destroy_intr_wq(struct scif_dev *scifdev);
+void scif_cleanup_scifdev(struct scif_dev *dev);
+void scif_handle_remove_node(int node);
+void scif_disconnect_node(u32 node_id, bool mgmt_initiated);
+void scif_free_qp(struct scif_dev *dev);
+void scif_misc_handler(struct work_struct *work);
+void scif_stop(struct scif_dev *scifdev);
+irqreturn_t scif_intr_handler(int irq, void *data);
+#endif /* SCIF_MAIN_H */
diff --git a/drivers/misc/mic/scif/scif_map.h b/drivers/misc/mic/scif/scif_map.h
new file mode 100644
index 0000000..20e50b4
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_map.h
@@ -0,0 +1,113 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#ifndef SCIF_MAP_H
+#define SCIF_MAP_H
+
+#include "../bus/scif_bus.h"
+
+static __always_inline void *
+scif_alloc_coherent(dma_addr_t *dma_handle,
+ struct scif_dev *scifdev, size_t size,
+ gfp_t gfp)
+{
+ void *va;
+
+ if (scifdev_self(scifdev)) {
+ va = kmalloc(size, gfp);
+ if (va)
+ *dma_handle = virt_to_phys(va);
+ } else {
+ va = dma_alloc_coherent(&scifdev->sdev->dev,
+ size, dma_handle, gfp);
+ if (va && scifdev_is_p2p(scifdev))
+ *dma_handle = *dma_handle + scifdev->base_addr;
+ }
+ return va;
+}
+
+static __always_inline void
+scif_free_coherent(void *va, dma_addr_t local,
+ struct scif_dev *scifdev, size_t size)
+{
+ if (scifdev_self(scifdev)) {
+ kfree(va);
+ } else {
+ if (scifdev_is_p2p(scifdev) && local > scifdev->base_addr)
+ local = local - scifdev->base_addr;
+ dma_free_coherent(&scifdev->sdev->dev,
+ size, va, local);
+ }
+}
+
+static __always_inline int
+scif_map_single(dma_addr_t *dma_handle,
+ void *local, struct scif_dev *scifdev, size_t size)
+{
+ int err = 0;
+
+ if (scifdev_self(scifdev)) {
+ *dma_handle = virt_to_phys((local));
+ } else {
+ *dma_handle = dma_map_single(&scifdev->sdev->dev,
+ local, size, DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(&scifdev->sdev->dev, *dma_handle))
+ err = -ENOMEM;
+ else if (scifdev_is_p2p(scifdev))
+ *dma_handle = *dma_handle + scifdev->base_addr;
+ }
+ if (err)
+ *dma_handle = 0;
+ return err;
+}
+
+static __always_inline void
+scif_unmap_single(dma_addr_t local, struct scif_dev *scifdev,
+ size_t size)
+{
+ if (!scifdev_self(scifdev)) {
+ if (scifdev_is_p2p(scifdev) && local > scifdev->base_addr)
+ local = local - scifdev->base_addr;
+ dma_unmap_single(&scifdev->sdev->dev, local,
+ size, DMA_BIDIRECTIONAL);
+ }
+}
+
+static __always_inline void *
+scif_ioremap(dma_addr_t phys, size_t size, struct scif_dev *scifdev)
+{
+ void *out_virt;
+ struct scif_hw_dev *sdev = scifdev->sdev;
+
+ if (scifdev_self(scifdev))
+ out_virt = phys_to_virt(phys);
+ else
+ out_virt = (void __force *)
+ sdev->hw_ops->ioremap(sdev, phys, size);
+ return out_virt;
+}
+
+static __always_inline void
+scif_iounmap(void *virt, size_t len, struct scif_dev *scifdev)
+{
+ if (!scifdev_self(scifdev)) {
+ struct scif_hw_dev *sdev = scifdev->sdev;
+
+ sdev->hw_ops->iounmap(sdev, (void __force __iomem *)virt);
+ }
+}
+#endif /* SCIF_MAP_H */
diff --git a/drivers/misc/mic/scif/scif_debugfs.c b/drivers/misc/mic/scif/scif_debugfs.c
new file mode 100644
index 0000000..51f14e2
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_debugfs.c
@@ -0,0 +1,85 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include "../common/mic_dev.h"
+#include "scif_main.h"
+
+/* Debugfs parent dir */
+static struct dentry *scif_dbg;
+
+static int scif_dev_test(struct seq_file *s, void *unused)
+{
+ int node;
+
+ seq_printf(s, "Total Nodes %d Self Node Id %d Maxid %d\n",
+ scif_info.total, scif_info.nodeid,
+ scif_info.maxid);
+
+ if (!scif_dev)
+ return 0;
+
+ seq_printf(s, "%-16s\t%-16s\n", "node_id", "state");
+
+ for (node = 0; node <= scif_info.maxid; node++)
+ seq_printf(s, "%-16d\t%-16s\n", scif_dev[node].node,
+ _scifdev_alive(&scif_dev[node]) ?
+ "Running" : "Offline");
+ return 0;
+}
+
+static int scif_dev_test_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, scif_dev_test, inode->i_private);
+}
+
+static int scif_dev_test_release(struct inode *inode, struct file *file)
+{
+ return single_release(inode, file);
+}
+
+static const struct file_operations scif_dev_ops = {
+ .owner = THIS_MODULE,
+ .open = scif_dev_test_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = scif_dev_test_release
+};
+
+void __init scif_init_debugfs(void)
+{
+ struct dentry *d;
+
+ scif_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
+ if (!scif_dbg) {
+ dev_err(scif_info.mdev.this_device,
+ "can't create debugfs dir scif\n");
+ return;
+ }
+
+ d = debugfs_create_file("scif_dev", 0444, scif_dbg,
+ NULL, &scif_dev_ops);
+ debugfs_create_u8("en_msg_log", 0666, scif_dbg, &scif_info.en_msg_log);
+ debugfs_create_u8("p2p_enable", 0666, scif_dbg, &scif_info.p2p_enable);
+}
+
+void scif_exit_debugfs(void)
+{
+ debugfs_remove_recursive(scif_dbg);
+}
diff --git a/drivers/misc/mic/scif/scif_main.c b/drivers/misc/mic/scif/scif_main.c
new file mode 100644
index 0000000..82792b1
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_main.c
@@ -0,0 +1,391 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include <linux/module.h>
+#include <linux/idr.h>
+
+#include <linux/mic_common.h>
+#include "../common/mic_dev.h"
+#include "../bus/scif_bus.h"
+#include "scif_peer_bus.h"
+#include "scif_main.h"
+#include "scif_map.h"
+
+struct scif_info scif_info = {
+ .mdev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "scif",
+ .fops = &scif_fops,
+ }
+};
+
+struct scif_dev *scif_dev;
+static atomic_t g_loopb_cnt;
+
+/* Runs in the context of intr_wq */
+static void scif_intr_bh_handler(struct work_struct *work)
+{
+ struct scif_dev *scifdev =
+ container_of(work, struct scif_dev, intr_bh);
+
+ if (scifdev_self(scifdev))
+ scif_loopb_msg_handler(scifdev, scifdev->qpairs);
+ else
+ scif_nodeqp_intrhandler(scifdev, scifdev->qpairs);
+}
+
+int scif_setup_intr_wq(struct scif_dev *scifdev)
+{
+ if (!scifdev->intr_wq) {
+ snprintf(scifdev->intr_wqname, sizeof(scifdev->intr_wqname),
+ "SCIF INTR %d", scifdev->node);
+ scifdev->intr_wq =
+ alloc_ordered_workqueue(scifdev->intr_wqname, 0);
+ if (!scifdev->intr_wq)
+ return -ENOMEM;
+ INIT_WORK(&scifdev->intr_bh, scif_intr_bh_handler);
+ }
+ return 0;
+}
+
+void scif_destroy_intr_wq(struct scif_dev *scifdev)
+{
+ if (scifdev->intr_wq) {
+ destroy_workqueue(scifdev->intr_wq);
+ scifdev->intr_wq = NULL;
+ }
+}
+
+irqreturn_t scif_intr_handler(int irq, void *data)
+{
+ struct scif_dev *scifdev = data;
+ struct scif_hw_dev *sdev = scifdev->sdev;
+
+ sdev->hw_ops->ack_interrupt(sdev, scifdev->db);
+ queue_work(scifdev->intr_wq, &scifdev->intr_bh);
+ return IRQ_HANDLED;
+}
+
+static int scif_peer_probe(struct scif_peer_dev *spdev)
+{
+ struct scif_dev *scifdev = &scif_dev[spdev->dnode];
+
+ mutex_lock(&scif_info.conflock);
+ scif_info.total++;
+ scif_info.maxid = max_t(u32, spdev->dnode, scif_info.maxid);
+ mutex_unlock(&scif_info.conflock);
+ rcu_assign_pointer(scifdev->spdev, spdev);
+
+ /* In the future SCIF kernel client devices will be added here */
+ dev_info(&spdev->dev, "Peer added dnode %d\n",
+ spdev->dnode);
+ return 0;
+}
+
+static void scif_peer_remove(struct scif_peer_dev *spdev)
+{
+ struct scif_dev *scifdev = &scif_dev[spdev->dnode];
+
+ /* In the future SCIF kernel client devices will be removed here */
+ spdev = rcu_dereference(scifdev->spdev);
+ if (spdev)
+ RCU_INIT_POINTER(scifdev->spdev, NULL);
+ synchronize_rcu();
+
+ mutex_lock(&scif_info.conflock);
+ scif_info.total--;
+ mutex_unlock(&scif_info.conflock);
+ dev_info(&spdev->dev, "Peer removed dnode %d\n",
+ spdev->dnode);
+}
+
+static void scif_qp_setup_handler(struct work_struct *work)
+{
+ struct scif_dev *scifdev = container_of(work, struct scif_dev,
+ qp_dwork.work);
+ struct scif_hw_dev *sdev = scifdev->sdev;
+ dma_addr_t da = 0;
+ int err;
+
+ if (scif_is_mgmt_node()) {
+ struct mic_bootparam *bp = sdev->dp;
+
+ da = bp->scif_card_dma_addr;
+ scifdev->rdb = bp->h2c_scif_db;
+ } else {
+ struct mic_bootparam __iomem *bp = sdev->rdp;
+
+ da = readq(&bp->scif_host_dma_addr);
+ scifdev->rdb = ioread8(&bp->c2h_scif_db);
+ }
+ if (da) {
+ err = scif_qp_response(da, scifdev);
+ if (err)
+ dev_err(&scifdev->sdev->dev,
+ "scif_qp_response err %d\n", err);
+ } else {
+ schedule_delayed_work(&scifdev->qp_dwork,
+ msecs_to_jiffies(1000));
+ }
+}
+
+static int scif_setup_scifdev(struct scif_hw_dev *sdev)
+{
+ int i;
+ u8 num_nodes;
+
+ if (sdev->snode) {
+ struct mic_bootparam __iomem *bp = sdev->rdp;
+
+ num_nodes = ioread8(&bp->tot_nodes);
+ } else {
+ struct mic_bootparam *bp = sdev->dp;
+
+ num_nodes = bp->tot_nodes;
+ }
+ scif_dev = kcalloc(num_nodes, sizeof(*scif_dev), GFP_KERNEL);
+ if (!scif_dev)
+ return -ENOMEM;
+ for (i = 0; i < num_nodes; i++) {
+ struct scif_dev *scifdev = &scif_dev[i];
+
+ scifdev->node = i;
+ scifdev->exit = OP_IDLE;
+ init_waitqueue_head(&scifdev->disconn_wq);
+ mutex_init(&scifdev->lock);
+ INIT_WORK(&scifdev->init_msg_work, scif_qp_response_ack);
+ INIT_DELAYED_WORK(&scifdev->p2p_dwork,
+ scif_poll_qp_state);
+ INIT_DELAYED_WORK(&scifdev->qp_dwork,
+ scif_qp_setup_handler);
+ INIT_LIST_HEAD(&scifdev->p2p);
+ RCU_INIT_POINTER(scifdev->spdev, NULL);
+ }
+ return 0;
+}
+
+static void scif_destroy_scifdev(void)
+{
+ kfree(scif_dev);
+}
+
+static int scif_probe(struct scif_hw_dev *sdev)
+{
+ struct scif_dev *scifdev;
+ int rc;
+
+ dev_set_drvdata(&sdev->dev, sdev);
+ if (1 == atomic_add_return(1, &g_loopb_cnt)) {
+ struct scif_dev *loopb_dev;
+
+ rc = scif_setup_scifdev(sdev);
+ if (rc)
+ goto exit;
+ scifdev = &scif_dev[sdev->dnode];
+ scifdev->sdev = sdev;
+ loopb_dev = &scif_dev[sdev->snode];
+ loopb_dev->sdev = sdev;
+ rc = scif_setup_loopback_qp(loopb_dev);
+ if (rc)
+ goto free_sdev;
+ } else {
+ scifdev = &scif_dev[sdev->dnode];
+ scifdev->sdev = sdev;
+ }
+ rc = scif_setup_intr_wq(scifdev);
+ if (rc)
+ goto destroy_loopb;
+ rc = scif_setup_qp(scifdev);
+ if (rc)
+ goto destroy_intr;
+ scifdev->db = sdev->hw_ops->next_db(sdev);
+ scifdev->cookie = sdev->hw_ops->request_irq(sdev, scif_intr_handler,
+ "SCIF_INTR", scifdev,
+ scifdev->db);
+ if (IS_ERR(scifdev->cookie)) {
+ rc = PTR_ERR(scifdev->cookie);
+ goto free_qp;
+ }
+ if (scif_is_mgmt_node()) {
+ struct mic_bootparam *bp = sdev->dp;
+
+ bp->c2h_scif_db = scifdev->db;
+ bp->scif_host_dma_addr = scifdev->qp_dma_addr;
+ } else {
+ struct mic_bootparam __iomem *bp = sdev->rdp;
+
+ iowrite8(scifdev->db, &bp->h2c_scif_db);
+ writeq(scifdev->qp_dma_addr, &bp->scif_card_dma_addr);
+ }
+ schedule_delayed_work(&scifdev->qp_dwork,
+ msecs_to_jiffies(1000));
+ return rc;
+free_qp:
+ scif_free_qp(scifdev);
+destroy_intr:
+ scif_destroy_intr_wq(scifdev);
+destroy_loopb:
+ if (atomic_dec_and_test(&g_loopb_cnt))
+ scif_destroy_loopback_qp(&scif_dev[sdev->snode]);
+free_sdev:
+ scif_destroy_scifdev();
+exit:
+ return rc;
+}
+
+void scif_stop(struct scif_dev *scifdev)
+{
+ struct scif_dev *dev;
+ int i;
+
+ for (i = scif_info.maxid; i >= 0; i--) {
+ dev = &scif_dev[i];
+ if (scifdev_self(dev))
+ continue;
+ scif_handle_remove_node(i);
+ }
+}
+
+static void scif_remove(struct scif_hw_dev *sdev)
+{
+ struct scif_dev *scifdev = &scif_dev[sdev->dnode];
+
+ if (scif_is_mgmt_node()) {
+ struct mic_bootparam *bp = sdev->dp;
+
+ bp->c2h_scif_db = -1;
+ bp->scif_host_dma_addr = 0x0;
+ } else {
+ struct mic_bootparam __iomem *bp = sdev->rdp;
+
+ iowrite8(-1, &bp->h2c_scif_db);
+ writeq(0x0, &bp->scif_card_dma_addr);
+ }
+ if (scif_is_mgmt_node()) {
+ scif_disconnect_node(scifdev->node, true);
+ } else {
+ scif_info.card_initiated_exit = true;
+ scif_stop(scifdev);
+ }
+ if (atomic_dec_and_test(&g_loopb_cnt))
+ scif_destroy_loopback_qp(&scif_dev[sdev->snode]);
+ if (scifdev->cookie) {
+ sdev->hw_ops->free_irq(sdev, scifdev->cookie, scifdev);
+ scifdev->cookie = NULL;
+ }
+ scif_destroy_intr_wq(scifdev);
+ cancel_delayed_work(&scifdev->qp_dwork);
+ scif_free_qp(scifdev);
+ scifdev->rdb = -1;
+ scifdev->sdev = NULL;
+}
+
+static struct scif_peer_driver scif_peer_driver = {
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .probe = scif_peer_probe,
+ .remove = scif_peer_remove,
+};
+
+static struct scif_hw_dev_id id_table[] = {
+ { MIC_SCIF_DEV, SCIF_DEV_ANY_ID },
+ { 0 },
+};
+
+static struct scif_driver scif_driver = {
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = scif_probe,
+ .remove = scif_remove,
+};
+
+static int _scif_init(void)
+{
+ spin_lock_init(&scif_info.eplock);
+ spin_lock_init(&scif_info.nb_connect_lock);
+ spin_lock_init(&scif_info.port_lock);
+ mutex_init(&scif_info.conflock);
+ mutex_init(&scif_info.connlock);
+ INIT_LIST_HEAD(&scif_info.uaccept);
+ INIT_LIST_HEAD(&scif_info.listen);
+ INIT_LIST_HEAD(&scif_info.zombie);
+ INIT_LIST_HEAD(&scif_info.connected);
+ INIT_LIST_HEAD(&scif_info.disconnected);
+ INIT_LIST_HEAD(&scif_info.nb_connect_list);
+ init_waitqueue_head(&scif_info.exitwq);
+ scif_info.en_msg_log = 0;
+ scif_info.p2p_enable = 1;
+ INIT_WORK(&scif_info.misc_work, scif_misc_handler);
+ idr_init(&scif_ports);
+ return 0;
+}
+
+static void _scif_exit(void)
+{
+ idr_destroy(&scif_ports);
+ scif_destroy_scifdev();
+}
+
+static int __init scif_init(void)
+{
+ struct miscdevice *mdev = &scif_info.mdev;
+ int rc;
+
+ _scif_init();
+ rc = scif_peer_bus_init();
+ if (rc)
+ goto exit;
+ rc = scif_peer_register_driver(&scif_peer_driver);
+ if (rc)
+ goto peer_bus_exit;
+ rc = scif_register_driver(&scif_driver);
+ if (rc)
+ goto unreg_scif_peer;
+ rc = misc_register(mdev);
+ if (rc)
+ goto unreg_scif;
+ scif_init_debugfs();
+ return 0;
+unreg_scif:
+ scif_unregister_driver(&scif_driver);
+unreg_scif_peer:
+ scif_peer_unregister_driver(&scif_peer_driver);
+peer_bus_exit:
+ scif_peer_bus_exit();
+exit:
+ _scif_exit();
+ return rc;
+}
+
+static void __exit scif_exit(void)
+{
+ scif_exit_debugfs();
+ misc_deregister(&scif_info.mdev);
+ scif_unregister_driver(&scif_driver);
+ scif_peer_unregister_driver(&scif_peer_driver);
+ scif_peer_bus_exit();
+ _scif_exit();
+}
+
+module_init(scif_init);
+module_exit(scif_exit);
+
+MODULE_DEVICE_TABLE(scif, id_table);
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Intel(R) SCIF driver");
+MODULE_LICENSE("GPL v2");
--
1.8.2.1
--
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