IB/hfi1: Add ioctl() interface for user commands

IOCTL is more suited to what user space commands need to do than the
write() interface. Add IOCTL definitions for all existing write commands
and the handling for those. The write() interface will be removed in a
follow on patch.

Reviewed-by: Mitko Haralanov <mitko.haralanov@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 204 insertions, 0 deletions

diff --git a/drivers/staging/rdma/hfi1/file_ops.c b/drivers/staging/rdma/hfi1/file_ops.c
index 322e55f7b4b4..a338238bef92 100644
--- a/drivers/staging/rdma/hfi1/file_ops.c
+++ b/drivers/staging/rdma/hfi1/file_ops.c
@@ -96,6 +96,8 @@ static int user_event_ack(struct hfi1_ctxtdata *, int, unsigned long);
 static int set_ctxt_pkey(struct hfi1_ctxtdata *, unsigned, u16);
 static int manage_rcvq(struct hfi1_ctxtdata *, unsigned, int);
 static int vma_fault(struct vm_area_struct *, struct vm_fault *);
+static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
+			    unsigned long arg);
 
 static const struct file_operations hfi1_file_ops = {
 	.owner = THIS_MODULE,
@@ -103,6 +105,7 @@ static const struct file_operations hfi1_file_ops = {
 	.write_iter = hfi1_write_iter,
 	.open = hfi1_file_open,
 	.release = hfi1_file_close,
+	.unlocked_ioctl = hfi1_file_ioctl,
 	.poll = hfi1_poll,
 	.mmap = hfi1_file_mmap,
 	.llseek = noop_llseek,
@@ -175,6 +178,207 @@ static int hfi1_file_open(struct inode *inode, struct file *fp)
 	return fp->private_data ? 0 : -ENOMEM;
 }
 
+static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
+			    unsigned long arg)
+{
+	struct hfi1_filedata *fd = fp->private_data;
+	struct hfi1_ctxtdata *uctxt = fd->uctxt;
+	struct hfi1_user_info uinfo;
+	struct hfi1_tid_info tinfo;
+	int ret = 0;
+	unsigned long addr;
+	int uval = 0;
+	unsigned long ul_uval = 0;
+	u16 uval16 = 0;
+
+	if (cmd != HFI1_IOCTL_ASSIGN_CTXT &&
+	    cmd != HFI1_IOCTL_GET_VERS &&
+	    !uctxt)
+		return -EINVAL;
+
+	switch (cmd) {
+	case HFI1_IOCTL_ASSIGN_CTXT:
+		if (copy_from_user(&uinfo,
+				   (struct hfi1_user_info __user *)arg,
+				   sizeof(uinfo)))
+			return -EFAULT;
+
+		ret = assign_ctxt(fp, &uinfo);
+		if (ret < 0)
+			return ret;
+		setup_ctxt(fp);
+		if (ret)
+			return ret;
+		ret = user_init(fp);
+		break;
+	case HFI1_IOCTL_CTXT_INFO:
+		ret = get_ctxt_info(fp, (void __user *)(unsigned long)arg,
+				    sizeof(struct hfi1_ctxt_info));
+		break;
+	case HFI1_IOCTL_USER_INFO:
+		ret = get_base_info(fp, (void __user *)(unsigned long)arg,
+				    sizeof(struct hfi1_base_info));
+		break;
+	case HFI1_IOCTL_CREDIT_UPD:
+		if (uctxt && uctxt->sc)
+			sc_return_credits(uctxt->sc);
+		break;
+
+	case HFI1_IOCTL_TID_UPDATE:
+		if (copy_from_user(&tinfo,
+				   (struct hfi11_tid_info __user *)arg,
+				   sizeof(tinfo)))
+			return -EFAULT;
+
+		ret = hfi1_user_exp_rcv_setup(fp, &tinfo);
+		if (!ret) {
+			/*
+			 * Copy the number of tidlist entries we used
+			 * and the length of the buffer we registered.
+			 * These fields are adjacent in the structure so
+			 * we can copy them at the same time.
+			 */
+			addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
+			if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
+					 sizeof(tinfo.tidcnt) +
+					 sizeof(tinfo.length)))
+				ret = -EFAULT;
+		}
+		break;
+
+	case HFI1_IOCTL_TID_FREE:
+		if (copy_from_user(&tinfo,
+				   (struct hfi11_tid_info __user *)arg,
+				   sizeof(tinfo)))
+			return -EFAULT;
+
+		ret = hfi1_user_exp_rcv_clear(fp, &tinfo);
+		if (ret)
+			break;
+		addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
+		if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
+				 sizeof(tinfo.tidcnt)))
+			ret = -EFAULT;
+		break;
+
+	case HFI1_IOCTL_TID_INVAL_READ:
+		if (copy_from_user(&tinfo,
+				   (struct hfi11_tid_info __user *)arg,
+				   sizeof(tinfo)))
+			return -EFAULT;
+
+		ret = hfi1_user_exp_rcv_invalid(fp, &tinfo);
+		if (ret)
+			break;
+		addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
+		if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
+				 sizeof(tinfo.tidcnt)))
+			ret = -EFAULT;
+		break;
+
+	case HFI1_IOCTL_RECV_CTRL:
+		ret = get_user(uval, (int __user *)arg);
+		if (ret != 0)
+			return -EFAULT;
+		ret = manage_rcvq(uctxt, fd->subctxt, uval);
+		break;
+
+	case HFI1_IOCTL_POLL_TYPE:
+		ret = get_user(uval, (int __user *)arg);
+		if (ret != 0)
+			return -EFAULT;
+		uctxt->poll_type = (typeof(uctxt->poll_type))uval;
+		break;
+
+	case HFI1_IOCTL_ACK_EVENT:
+		ret = get_user(ul_uval, (unsigned long __user *)arg);
+		if (ret != 0)
+			return -EFAULT;
+		ret = user_event_ack(uctxt, fd->subctxt, ul_uval);
+		break;
+
+	case HFI1_IOCTL_SET_PKEY:
+		ret = get_user(uval16, (u16 __user *)arg);
+		if (ret != 0)
+			return -EFAULT;
+		if (HFI1_CAP_IS_USET(PKEY_CHECK))
+			ret = set_ctxt_pkey(uctxt, fd->subctxt, uval16);
+		else
+			return -EPERM;
+		break;
+
+	case HFI1_IOCTL_CTXT_RESET: {
+		struct send_context *sc;
+		struct hfi1_devdata *dd;
+
+		if (!uctxt || !uctxt->dd || !uctxt->sc)
+			return -EINVAL;
+
+		/*
+		 * There is no protection here. User level has to
+		 * guarantee that no one will be writing to the send
+		 * context while it is being re-initialized.
+		 * If user level breaks that guarantee, it will break
+		 * it's own context and no one else's.
+		 */
+		dd = uctxt->dd;
+		sc = uctxt->sc;
+		/*
+		 * Wait until the interrupt handler has marked the
+		 * context as halted or frozen. Report error if we time
+		 * out.
+		 */
+		wait_event_interruptible_timeout(
+			sc->halt_wait, (sc->flags & SCF_HALTED),
+			msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
+		if (!(sc->flags & SCF_HALTED))
+			return -ENOLCK;
+
+		/*
+		 * If the send context was halted due to a Freeze,
+		 * wait until the device has been "unfrozen" before
+		 * resetting the context.
+		 */
+		if (sc->flags & SCF_FROZEN) {
+			wait_event_interruptible_timeout(
+				dd->event_queue,
+				!(ACCESS_ONCE(dd->flags) & HFI1_FROZEN),
+				msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
+			if (dd->flags & HFI1_FROZEN)
+				return -ENOLCK;
+
+			if (dd->flags & HFI1_FORCED_FREEZE)
+				/*
+				 * Don't allow context reset if we are into
+				 * forced freeze
+				 */
+				return -ENODEV;
+
+			sc_disable(sc);
+			ret = sc_enable(sc);
+			hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_ENB,
+				     uctxt->ctxt);
+		} else {
+			ret = sc_restart(sc);
+		}
+		if (!ret)
+			sc_return_credits(sc);
+		break;
+	}
+
+	case HFI1_IOCTL_GET_VERS:
+		uval = HFI1_USER_SWVERSION;
+		if (put_user(uval, (int __user *)arg))
+			return -EFAULT;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
 static ssize_t hfi1_file_write(struct file *fp, const char __user *data,
 			       size_t count, loff_t *offset)
 {