* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
- * $Id: user_mad.c 2814 2005-07-06 19:14:09Z halr $
+ * $Id: user_mad.c 4010 2005-11-09 23:11:56Z roland $
*/
#include <linux/module.h>
IB_UMAD_MINOR_BASE = 0
};
+/*
+ * Our lifetime rules for these structs are the following: each time a
+ * device special file is opened, we look up the corresponding struct
+ * ib_umad_port by minor in the umad_port[] table while holding the
+ * port_lock. If this lookup succeeds, we take a reference on the
+ * ib_umad_port's struct ib_umad_device while still holding the
+ * port_lock; if the lookup fails, we fail the open(). We drop these
+ * references in the corresponding close().
+ *
+ * In addition to references coming from open character devices, there
+ * is one more reference to each ib_umad_device representing the
+ * module's reference taken when allocating the ib_umad_device in
+ * ib_umad_add_one().
+ *
+ * When destroying an ib_umad_device, we clear all of its
+ * ib_umad_ports from umad_port[] while holding port_lock before
+ * dropping the module's reference to the ib_umad_device. This is
+ * always safe because any open() calls will either succeed and obtain
+ * a reference before we clear the umad_port[] entries, or fail after
+ * we clear the umad_port[] entries.
+ */
+
struct ib_umad_port {
- int devnum;
- struct cdev dev;
- struct class_device class_dev;
+ struct cdev *dev;
+ struct class_device *class_dev;
- int sm_devnum;
- struct cdev sm_dev;
- struct class_device sm_class_dev;
+ struct cdev *sm_dev;
+ struct class_device *sm_class_dev;
struct semaphore sm_sem;
+ struct rw_semaphore mutex;
+ struct list_head file_list;
+
struct ib_device *ib_dev;
struct ib_umad_device *umad_dev;
+ int dev_num;
u8 port_num;
};
};
struct ib_umad_file {
- struct ib_umad_port *port;
- spinlock_t recv_lock;
- struct list_head recv_list;
- wait_queue_head_t recv_wait;
- struct rw_semaphore agent_mutex;
- struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
- struct ib_mr *mr[IB_UMAD_MAX_AGENTS];
+ struct ib_umad_port *port;
+ struct list_head recv_list;
+ struct list_head port_list;
+ spinlock_t recv_lock;
+ wait_queue_head_t recv_wait;
+ struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
+ int agents_dead;
};
struct ib_umad_packet {
- struct ib_ah *ah;
struct ib_mad_send_buf *msg;
struct list_head list;
int length;
- DECLARE_PCI_UNMAP_ADDR(mapping)
struct ib_user_mad mad;
};
+static struct class *umad_class;
+
static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
-static spinlock_t map_lock;
+
+static DEFINE_SPINLOCK(port_lock);
+static struct ib_umad_port *umad_port[IB_UMAD_MAX_PORTS];
static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS * 2);
static void ib_umad_add_one(struct ib_device *device);
static void ib_umad_remove_one(struct ib_device *device);
+static void ib_umad_release_dev(struct kref *ref)
+{
+ struct ib_umad_device *dev =
+ container_of(ref, struct ib_umad_device, ref);
+
+ kfree(dev);
+}
+
+/* caller must hold port->mutex at least for reading */
+static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
+{
+ return file->agents_dead ? NULL : file->agent[id];
+}
+
static int queue_packet(struct ib_umad_file *file,
struct ib_mad_agent *agent,
struct ib_umad_packet *packet)
{
int ret = 1;
- down_read(&file->agent_mutex);
+ down_read(&file->port->mutex);
+
for (packet->mad.hdr.id = 0;
packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
packet->mad.hdr.id++)
- if (agent == file->agent[packet->mad.hdr.id]) {
+ if (agent == __get_agent(file, packet->mad.hdr.id)) {
spin_lock_irq(&file->recv_lock);
list_add_tail(&packet->list, &file->recv_list);
spin_unlock_irq(&file->recv_lock);
break;
}
- up_read(&file->agent_mutex);
+ up_read(&file->port->mutex);
return ret;
}
struct ib_mad_send_wc *send_wc)
{
struct ib_umad_file *file = agent->context;
- struct ib_umad_packet *timeout, *packet =
- (void *) (unsigned long) send_wc->wr_id;
+ struct ib_umad_packet *timeout;
+ struct ib_umad_packet *packet = send_wc->send_buf->context[0];
- ib_destroy_ah(packet->msg->send_wr.wr.ud.ah);
+ ib_destroy_ah(packet->msg->ah);
ib_free_send_mad(packet->msg);
if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
- timeout = kmalloc(sizeof *timeout + sizeof (struct ib_mad_hdr),
- GFP_KERNEL);
+ timeout = kzalloc(sizeof *timeout + IB_MGMT_MAD_HDR, GFP_KERNEL);
if (!timeout)
goto out;
- memset(timeout, 0, sizeof *timeout + sizeof (struct ib_mad_hdr));
-
- timeout->length = sizeof (struct ib_mad_hdr);
- timeout->mad.hdr.id = packet->mad.hdr.id;
+ timeout->length = IB_MGMT_MAD_HDR;
+ timeout->mad.hdr.id = packet->mad.hdr.id;
timeout->mad.hdr.status = ETIMEDOUT;
memcpy(timeout->mad.data, packet->mad.data,
sizeof (struct ib_mad_hdr));
goto out;
length = mad_recv_wc->mad_len;
- packet = kmalloc(sizeof *packet + length, GFP_KERNEL);
+ packet = kzalloc(sizeof *packet + length, GFP_KERNEL);
if (!packet)
goto out;
- memset(packet, 0, sizeof *packet + length);
packet->length = length;
ib_coalesce_recv_mad(mad_recv_wc, packet->mad.data);
else
ret = -ENOSPC;
} else if (copy_to_user(buf, &packet->mad,
- packet->length + sizeof (struct ib_user_mad)))
+ packet->length + sizeof (struct ib_user_mad)))
ret = -EFAULT;
else
ret = packet->length + sizeof (struct ib_user_mad);
struct ib_umad_packet *packet;
struct ib_mad_agent *agent;
struct ib_ah_attr ah_attr;
- struct ib_send_wr *bad_wr;
+ struct ib_ah *ah;
struct ib_rmpp_mad *rmpp_mad;
u8 method;
__be64 *tid;
- int ret, length, hdr_len, data_len, rmpp_hdr_size;
- int rmpp_active = 0;
+ int ret, length, hdr_len, copy_offset;
+ int rmpp_active, has_rmpp_header;
- if (count < sizeof (struct ib_user_mad))
+ if (count < sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR)
return -EINVAL;
length = count - sizeof (struct ib_user_mad);
- packet = kmalloc(sizeof *packet + sizeof(struct ib_mad_hdr) +
- sizeof(struct ib_rmpp_hdr), GFP_KERNEL);
+ packet = kmalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
if (!packet)
return -ENOMEM;
if (copy_from_user(&packet->mad, buf,
- sizeof (struct ib_user_mad) +
- sizeof(struct ib_mad_hdr) +
- sizeof(struct ib_rmpp_hdr))) {
+ sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR)) {
ret = -EFAULT;
goto err;
}
goto err;
}
- packet->length = length;
-
- down_read(&file->agent_mutex);
+ down_read(&file->port->mutex);
- agent = file->agent[packet->mad.hdr.id];
+ agent = __get_agent(file, packet->mad.hdr.id);
if (!agent) {
ret = -EINVAL;
goto err_up;
ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
}
- packet->ah = ib_create_ah(agent->qp->pd, &ah_attr);
- if (IS_ERR(packet->ah)) {
- ret = PTR_ERR(packet->ah);
+ ah = ib_create_ah(agent->qp->pd, &ah_attr);
+ if (IS_ERR(ah)) {
+ ret = PTR_ERR(ah);
goto err_up;
}
rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
- if (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE) {
- /* RMPP active */
- if (!agent->rmpp_version) {
- ret = -EINVAL;
- goto err_ah;
- }
-
- /* Validate that the management class can support RMPP */
- if (rmpp_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_ADM) {
- hdr_len = offsetof(struct ib_sa_mad, data);
- data_len = length - hdr_len;
- } else if ((rmpp_mad->mad_hdr.mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
- (rmpp_mad->mad_hdr.mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) {
- hdr_len = offsetof(struct ib_vendor_mad, data);
- data_len = length - hdr_len;
- } else {
- ret = -EINVAL;
- goto err_ah;
- }
- rmpp_active = 1;
+ if (rmpp_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_ADM) {
+ hdr_len = IB_MGMT_SA_HDR;
+ copy_offset = IB_MGMT_RMPP_HDR;
+ has_rmpp_header = 1;
+ } else if (rmpp_mad->mad_hdr.mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START &&
+ rmpp_mad->mad_hdr.mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END) {
+ hdr_len = IB_MGMT_VENDOR_HDR;
+ copy_offset = IB_MGMT_RMPP_HDR;
+ has_rmpp_header = 1;
} else {
- if (length > sizeof(struct ib_mad)) {
- ret = -EINVAL;
- goto err_ah;
- }
- hdr_len = offsetof(struct ib_mad, data);
- data_len = length - hdr_len;
+ hdr_len = IB_MGMT_MAD_HDR;
+ copy_offset = IB_MGMT_MAD_HDR;
+ has_rmpp_header = 0;
+ }
+
+ if (has_rmpp_header)
+ rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
+ IB_MGMT_RMPP_FLAG_ACTIVE;
+ else
+ rmpp_active = 0;
+
+ /* Validate that the management class can support RMPP */
+ if (rmpp_active && !agent->rmpp_version) {
+ ret = -EINVAL;
+ goto err_ah;
}
packet->msg = ib_create_send_mad(agent,
be32_to_cpu(packet->mad.hdr.qpn),
- 0, packet->ah, rmpp_active,
- hdr_len, data_len,
+ 0, rmpp_active,
+ hdr_len, length - hdr_len,
GFP_KERNEL);
if (IS_ERR(packet->msg)) {
ret = PTR_ERR(packet->msg);
goto err_ah;
}
- packet->msg->send_wr.wr.ud.timeout_ms = packet->mad.hdr.timeout_ms;
- packet->msg->send_wr.wr.ud.retries = packet->mad.hdr.retries;
-
- /* Override send WR WRID initialized in ib_create_send_mad */
- packet->msg->send_wr.wr_id = (unsigned long) packet;
-
- if (!rmpp_active) {
- /* Copy message from user into send buffer */
- if (copy_from_user(packet->msg->mad,
- buf + sizeof(struct ib_user_mad), length)) {
- ret = -EFAULT;
- goto err_msg;
- }
- } else {
- rmpp_hdr_size = sizeof(struct ib_mad_hdr) +
- sizeof(struct ib_rmpp_hdr);
-
- /* Only copy MAD headers (RMPP header in place) */
- memcpy(packet->msg->mad, packet->mad.data,
- sizeof(struct ib_mad_hdr));
+ packet->msg->ah = ah;
+ packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
+ packet->msg->retries = packet->mad.hdr.retries;
+ packet->msg->context[0] = packet;
- /* Now, copy rest of message from user into send buffer */
- if (copy_from_user(((struct ib_rmpp_mad *) packet->msg->mad)->data,
- buf + sizeof (struct ib_user_mad) + rmpp_hdr_size,
- length - rmpp_hdr_size)) {
- ret = -EFAULT;
- goto err_msg;
- }
+ /* Copy MAD headers (RMPP header in place) */
+ memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
+ /* Now, copy rest of message from user into send buffer */
+ if (copy_from_user(packet->msg->mad + copy_offset,
+ buf + sizeof (struct ib_user_mad) + copy_offset,
+ length - copy_offset)) {
+ ret = -EFAULT;
+ goto err_msg;
}
/*
* transaction ID matches the agent being used to send the
* MAD.
*/
- method = packet->msg->mad->mad_hdr.method;
+ method = ((struct ib_mad_hdr *) packet->msg->mad)->method;
if (!(method & IB_MGMT_METHOD_RESP) &&
method != IB_MGMT_METHOD_TRAP_REPRESS &&
method != IB_MGMT_METHOD_SEND) {
- tid = &packet->msg->mad->mad_hdr.tid;
+ tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
*tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
(be64_to_cpup(tid) & 0xffffffff));
}
- ret = ib_post_send_mad(agent, &packet->msg->send_wr, &bad_wr);
+ ret = ib_post_send_mad(packet->msg, NULL);
if (ret)
goto err_msg;
- up_read(&file->agent_mutex);
+ up_read(&file->port->mutex);
- return sizeof (struct ib_user_mad_hdr) + packet->length;
+ return count;
err_msg:
ib_free_send_mad(packet->msg);
err_ah:
- ib_destroy_ah(packet->ah);
+ ib_destroy_ah(ah);
err_up:
- up_read(&file->agent_mutex);
+ up_read(&file->port->mutex);
err:
kfree(packet);
int agent_id;
int ret;
- down_write(&file->agent_mutex);
+ down_write(&file->port->mutex);
+
+ if (!file->port->ib_dev) {
+ ret = -EPIPE;
+ goto out;
+ }
if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) {
ret = -EFAULT;
}
for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
- if (!file->agent[agent_id])
+ if (!__get_agent(file, agent_id))
goto found;
ret = -ENOMEM;
goto out;
}
- file->agent[agent_id] = agent;
-
- file->mr[agent_id] = ib_get_dma_mr(agent->qp->pd, IB_ACCESS_LOCAL_WRITE);
- if (IS_ERR(file->mr[agent_id])) {
- ret = -ENOMEM;
- goto err;
- }
-
if (put_user(agent_id,
(u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
ret = -EFAULT;
- goto err_mr;
+ ib_unregister_mad_agent(agent);
+ goto out;
}
+ file->agent[agent_id] = agent;
ret = 0;
- goto out;
-
-err_mr:
- ib_dereg_mr(file->mr[agent_id]);
-
-err:
- file->agent[agent_id] = NULL;
- ib_unregister_mad_agent(agent);
out:
- up_write(&file->agent_mutex);
+ up_write(&file->port->mutex);
return ret;
}
static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg)
{
+ struct ib_mad_agent *agent = NULL;
u32 id;
int ret = 0;
- down_write(&file->agent_mutex);
+ if (get_user(id, (u32 __user *) arg))
+ return -EFAULT;
- if (get_user(id, (u32 __user *) arg)) {
- ret = -EFAULT;
- goto out;
- }
+ down_write(&file->port->mutex);
- if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !file->agent[id]) {
+ if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
ret = -EINVAL;
goto out;
}
- ib_dereg_mr(file->mr[id]);
- ib_unregister_mad_agent(file->agent[id]);
+ agent = file->agent[id];
file->agent[id] = NULL;
out:
- up_write(&file->agent_mutex);
+ up_write(&file->port->mutex);
+
+ if (agent)
+ ib_unregister_mad_agent(agent);
+
return ret;
}
static int ib_umad_open(struct inode *inode, struct file *filp)
{
- struct ib_umad_port *port =
- container_of(inode->i_cdev, struct ib_umad_port, dev);
+ struct ib_umad_port *port;
struct ib_umad_file *file;
+ int ret = 0;
- file = kmalloc(sizeof *file, GFP_KERNEL);
- if (!file)
- return -ENOMEM;
+ spin_lock(&port_lock);
+ port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE];
+ if (port)
+ kref_get(&port->umad_dev->ref);
+ spin_unlock(&port_lock);
+
+ if (!port)
+ return -ENXIO;
- memset(file, 0, sizeof *file);
+ down_write(&port->mutex);
+
+ if (!port->ib_dev) {
+ ret = -ENXIO;
+ goto out;
+ }
+
+ file = kzalloc(sizeof *file, GFP_KERNEL);
+ if (!file) {
+ kref_put(&port->umad_dev->ref, ib_umad_release_dev);
+ ret = -ENOMEM;
+ goto out;
+ }
spin_lock_init(&file->recv_lock);
- init_rwsem(&file->agent_mutex);
INIT_LIST_HEAD(&file->recv_list);
init_waitqueue_head(&file->recv_wait);
file->port = port;
filp->private_data = file;
- return 0;
+ list_add_tail(&file->port_list, &port->file_list);
+
+out:
+ up_write(&port->mutex);
+ return ret;
}
static int ib_umad_close(struct inode *inode, struct file *filp)
{
struct ib_umad_file *file = filp->private_data;
+ struct ib_umad_device *dev = file->port->umad_dev;
struct ib_umad_packet *packet, *tmp;
+ int already_dead;
int i;
- for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
- if (file->agent[i]) {
- ib_dereg_mr(file->mr[i]);
- ib_unregister_mad_agent(file->agent[i]);
- }
+ down_write(&file->port->mutex);
+
+ already_dead = file->agents_dead;
+ file->agents_dead = 1;
list_for_each_entry_safe(packet, tmp, &file->recv_list, list)
kfree(packet);
+ list_del(&file->port_list);
+
+ downgrade_write(&file->port->mutex);
+
+ if (!already_dead)
+ for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
+ if (file->agent[i])
+ ib_unregister_mad_agent(file->agent[i]);
+
+ up_read(&file->port->mutex);
+
kfree(file);
+ kref_put(&dev->ref, ib_umad_release_dev);
return 0;
}
static int ib_umad_sm_open(struct inode *inode, struct file *filp)
{
- struct ib_umad_port *port =
- container_of(inode->i_cdev, struct ib_umad_port, sm_dev);
+ struct ib_umad_port *port;
struct ib_port_modify props = {
.set_port_cap_mask = IB_PORT_SM
};
int ret;
+ spin_lock(&port_lock);
+ port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE - IB_UMAD_MAX_PORTS];
+ if (port)
+ kref_get(&port->umad_dev->ref);
+ spin_unlock(&port_lock);
+
+ if (!port)
+ return -ENXIO;
+
if (filp->f_flags & O_NONBLOCK) {
- if (down_trylock(&port->sm_sem))
- return -EAGAIN;
+ if (down_trylock(&port->sm_sem)) {
+ ret = -EAGAIN;
+ goto fail;
+ }
} else {
- if (down_interruptible(&port->sm_sem))
- return -ERESTARTSYS;
+ if (down_interruptible(&port->sm_sem)) {
+ ret = -ERESTARTSYS;
+ goto fail;
+ }
}
ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
if (ret) {
up(&port->sm_sem);
- return ret;
+ goto fail;
}
filp->private_data = port;
return 0;
+
+fail:
+ kref_put(&port->umad_dev->ref, ib_umad_release_dev);
+ return ret;
}
static int ib_umad_sm_close(struct inode *inode, struct file *filp)
struct ib_port_modify props = {
.clr_port_cap_mask = IB_PORT_SM
};
- int ret;
+ int ret = 0;
+
+ down_write(&port->mutex);
+ if (port->ib_dev)
+ ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
+ up_write(&port->mutex);
- ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
up(&port->sm_sem);
+ kref_put(&port->umad_dev->ref, ib_umad_release_dev);
+
return ret;
}
.remove = ib_umad_remove_one
};
-static ssize_t show_dev(struct class_device *class_dev, char *buf)
-{
- struct ib_umad_port *port = class_get_devdata(class_dev);
-
- if (class_dev == &port->class_dev)
- return print_dev_t(buf, port->dev.dev);
- else
- return print_dev_t(buf, port->sm_dev.dev);
-}
-static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL);
-
static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
{
struct ib_umad_port *port = class_get_devdata(class_dev);
+ if (!port)
+ return -ENODEV;
+
return sprintf(buf, "%s\n", port->ib_dev->name);
}
static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
{
struct ib_umad_port *port = class_get_devdata(class_dev);
+ if (!port)
+ return -ENODEV;
+
return sprintf(buf, "%d\n", port->port_num);
}
static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
-static void ib_umad_release_dev(struct kref *ref)
-{
- struct ib_umad_device *dev =
- container_of(ref, struct ib_umad_device, ref);
-
- kfree(dev);
-}
-
-static void ib_umad_release_port(struct class_device *class_dev)
-{
- struct ib_umad_port *port = class_get_devdata(class_dev);
-
- if (class_dev == &port->class_dev) {
- cdev_del(&port->dev);
- clear_bit(port->devnum, dev_map);
- } else {
- cdev_del(&port->sm_dev);
- clear_bit(port->sm_devnum, dev_map);
- }
-
- kref_put(&port->umad_dev->ref, ib_umad_release_dev);
-}
-
-static struct class umad_class = {
- .name = "infiniband_mad",
- .release = ib_umad_release_port
-};
-
static ssize_t show_abi_version(struct class *class, char *buf)
{
return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
static int ib_umad_init_port(struct ib_device *device, int port_num,
struct ib_umad_port *port)
{
- spin_lock(&map_lock);
- port->devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
- if (port->devnum >= IB_UMAD_MAX_PORTS) {
- spin_unlock(&map_lock);
- return -1;
- }
- port->sm_devnum = find_next_zero_bit(dev_map, IB_UMAD_MAX_PORTS * 2, IB_UMAD_MAX_PORTS);
- if (port->sm_devnum >= IB_UMAD_MAX_PORTS * 2) {
- spin_unlock(&map_lock);
+ spin_lock(&port_lock);
+ port->dev_num = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
+ if (port->dev_num >= IB_UMAD_MAX_PORTS) {
+ spin_unlock(&port_lock);
return -1;
}
- set_bit(port->devnum, dev_map);
- set_bit(port->sm_devnum, dev_map);
- spin_unlock(&map_lock);
+ set_bit(port->dev_num, dev_map);
+ spin_unlock(&port_lock);
port->ib_dev = device;
port->port_num = port_num;
init_MUTEX(&port->sm_sem);
+ init_rwsem(&port->mutex);
+ INIT_LIST_HEAD(&port->file_list);
- cdev_init(&port->dev, &umad_fops);
- port->dev.owner = THIS_MODULE;
- kobject_set_name(&port->dev.kobj, "umad%d", port->devnum);
- if (cdev_add(&port->dev, base_dev + port->devnum, 1))
+ port->dev = cdev_alloc();
+ if (!port->dev)
return -1;
-
- port->class_dev.class = &umad_class;
- port->class_dev.dev = device->dma_device;
-
- snprintf(port->class_dev.class_id, BUS_ID_SIZE, "umad%d", port->devnum);
-
- if (class_device_register(&port->class_dev))
+ port->dev->owner = THIS_MODULE;
+ port->dev->ops = &umad_fops;
+ kobject_set_name(&port->dev->kobj, "umad%d", port->dev_num);
+ if (cdev_add(port->dev, base_dev + port->dev_num, 1))
goto err_cdev;
- class_set_devdata(&port->class_dev, port);
- kref_get(&port->umad_dev->ref);
+ port->class_dev = class_device_create(umad_class, NULL, port->dev->dev,
+ device->dma_device,
+ "umad%d", port->dev_num);
+ if (IS_ERR(port->class_dev))
+ goto err_cdev;
- if (class_device_create_file(&port->class_dev, &class_device_attr_dev))
- goto err_class;
- if (class_device_create_file(&port->class_dev, &class_device_attr_ibdev))
+ if (class_device_create_file(port->class_dev, &class_device_attr_ibdev))
goto err_class;
- if (class_device_create_file(&port->class_dev, &class_device_attr_port))
+ if (class_device_create_file(port->class_dev, &class_device_attr_port))
goto err_class;
- cdev_init(&port->sm_dev, &umad_sm_fops);
- port->sm_dev.owner = THIS_MODULE;
- kobject_set_name(&port->dev.kobj, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS);
- if (cdev_add(&port->sm_dev, base_dev + port->sm_devnum, 1))
- return -1;
-
- port->sm_class_dev.class = &umad_class;
- port->sm_class_dev.dev = device->dma_device;
-
- snprintf(port->sm_class_dev.class_id, BUS_ID_SIZE, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS);
+ port->sm_dev = cdev_alloc();
+ if (!port->sm_dev)
+ goto err_class;
+ port->sm_dev->owner = THIS_MODULE;
+ port->sm_dev->ops = &umad_sm_fops;
+ kobject_set_name(&port->sm_dev->kobj, "issm%d", port->dev_num);
+ if (cdev_add(port->sm_dev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1))
+ goto err_sm_cdev;
- if (class_device_register(&port->sm_class_dev))
+ port->sm_class_dev = class_device_create(umad_class, NULL, port->sm_dev->dev,
+ device->dma_device,
+ "issm%d", port->dev_num);
+ if (IS_ERR(port->sm_class_dev))
goto err_sm_cdev;
- class_set_devdata(&port->sm_class_dev, port);
- kref_get(&port->umad_dev->ref);
+ class_set_devdata(port->class_dev, port);
+ class_set_devdata(port->sm_class_dev, port);
- if (class_device_create_file(&port->sm_class_dev, &class_device_attr_dev))
+ if (class_device_create_file(port->sm_class_dev, &class_device_attr_ibdev))
goto err_sm_class;
- if (class_device_create_file(&port->sm_class_dev, &class_device_attr_ibdev))
- goto err_sm_class;
- if (class_device_create_file(&port->sm_class_dev, &class_device_attr_port))
+ if (class_device_create_file(port->sm_class_dev, &class_device_attr_port))
goto err_sm_class;
+ spin_lock(&port_lock);
+ umad_port[port->dev_num] = port;
+ spin_unlock(&port_lock);
+
return 0;
err_sm_class:
- class_device_unregister(&port->sm_class_dev);
+ class_device_destroy(umad_class, port->sm_dev->dev);
err_sm_cdev:
- cdev_del(&port->sm_dev);
+ cdev_del(port->sm_dev);
err_class:
- class_device_unregister(&port->class_dev);
+ class_device_destroy(umad_class, port->dev->dev);
err_cdev:
- cdev_del(&port->dev);
- clear_bit(port->devnum, dev_map);
+ cdev_del(port->dev);
+ clear_bit(port->dev_num, dev_map);
return -1;
}
+static void ib_umad_kill_port(struct ib_umad_port *port)
+{
+ struct ib_umad_file *file;
+ int id;
+
+ class_set_devdata(port->class_dev, NULL);
+ class_set_devdata(port->sm_class_dev, NULL);
+
+ class_device_destroy(umad_class, port->dev->dev);
+ class_device_destroy(umad_class, port->sm_dev->dev);
+
+ cdev_del(port->dev);
+ cdev_del(port->sm_dev);
+
+ spin_lock(&port_lock);
+ umad_port[port->dev_num] = NULL;
+ spin_unlock(&port_lock);
+
+ down_write(&port->mutex);
+
+ port->ib_dev = NULL;
+
+ /*
+ * Now go through the list of files attached to this port and
+ * unregister all of their MAD agents. We need to hold
+ * port->mutex while doing this to avoid racing with
+ * ib_umad_close(), but we can't hold the mutex for writing
+ * while calling ib_unregister_mad_agent(), since that might
+ * deadlock by calling back into queue_packet(). So we
+ * downgrade our lock to a read lock, and then drop and
+ * reacquire the write lock for the next iteration.
+ *
+ * We do list_del_init() on the file's list_head so that the
+ * list_del in ib_umad_close() is still OK, even after the
+ * file is removed from the list.
+ */
+ while (!list_empty(&port->file_list)) {
+ file = list_entry(port->file_list.next, struct ib_umad_file,
+ port_list);
+
+ file->agents_dead = 1;
+ list_del_init(&file->port_list);
+
+ downgrade_write(&port->mutex);
+
+ for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
+ if (file->agent[id])
+ ib_unregister_mad_agent(file->agent[id]);
+
+ up_read(&port->mutex);
+ down_write(&port->mutex);
+ }
+
+ up_write(&port->mutex);
+
+ clear_bit(port->dev_num, dev_map);
+}
+
static void ib_umad_add_one(struct ib_device *device)
{
struct ib_umad_device *umad_dev;
e = device->phys_port_cnt;
}
- umad_dev = kmalloc(sizeof *umad_dev +
+ umad_dev = kzalloc(sizeof *umad_dev +
(e - s + 1) * sizeof (struct ib_umad_port),
GFP_KERNEL);
if (!umad_dev)
return;
- memset(umad_dev, 0, sizeof *umad_dev +
- (e - s + 1) * sizeof (struct ib_umad_port));
-
kref_init(&umad_dev->ref);
umad_dev->start_port = s;
return;
err:
- while (--i >= s) {
- class_device_unregister(&umad_dev->port[i - s].class_dev);
- class_device_unregister(&umad_dev->port[i - s].sm_class_dev);
- }
+ while (--i >= s)
+ ib_umad_kill_port(&umad_dev->port[i - s]);
kref_put(&umad_dev->ref, ib_umad_release_dev);
}
if (!umad_dev)
return;
- for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) {
- class_device_unregister(&umad_dev->port[i].class_dev);
- class_device_unregister(&umad_dev->port[i].sm_class_dev);
- }
+ for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i)
+ ib_umad_kill_port(&umad_dev->port[i]);
kref_put(&umad_dev->ref, ib_umad_release_dev);
}
{
int ret;
- spin_lock_init(&map_lock);
-
ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
"infiniband_mad");
if (ret) {
goto out;
}
- ret = class_register(&umad_class);
- if (ret) {
+ umad_class = class_create(THIS_MODULE, "infiniband_mad");
+ if (IS_ERR(umad_class)) {
+ ret = PTR_ERR(umad_class);
printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
goto out_chrdev;
}
- ret = class_create_file(&umad_class, &class_attr_abi_version);
+ ret = class_create_file(umad_class, &class_attr_abi_version);
if (ret) {
printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
goto out_class;
return 0;
out_class:
- class_unregister(&umad_class);
+ class_destroy(umad_class);
out_chrdev:
unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
static void __exit ib_umad_cleanup(void)
{
ib_unregister_client(&umad_client);
- class_unregister(&umad_class);
+ class_destroy(umad_class);
unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
}
git.openpandora.org / pandora-kernel.git / blobdiff