diff options
Diffstat (limited to 'drivers/infiniband/hw/hfi1/file_ops.c')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/file_ops.c | 486 |
1 files changed, 280 insertions, 206 deletions
diff --git a/drivers/infiniband/hw/hfi1/file_ops.c b/drivers/infiniband/hw/hfi1/file_ops.c index d9a1e9893136..7750a9c38b06 100644 --- a/drivers/infiniband/hw/hfi1/file_ops.c +++ b/drivers/infiniband/hw/hfi1/file_ops.c @@ -78,16 +78,20 @@ static unsigned int hfi1_poll(struct file *fp, struct poll_table_struct *pt); static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma); static u64 kvirt_to_phys(void *addr); -static int assign_ctxt(struct hfi1_filedata *fd, struct hfi1_user_info *uinfo); +static int assign_ctxt(struct hfi1_filedata *fd, unsigned long arg, u32 len); static void init_subctxts(struct hfi1_ctxtdata *uctxt, const struct hfi1_user_info *uinfo); static int init_user_ctxt(struct hfi1_filedata *fd, struct hfi1_ctxtdata *uctxt); static void user_init(struct hfi1_ctxtdata *uctxt); -static int get_ctxt_info(struct hfi1_filedata *fd, void __user *ubase, - __u32 len); -static int get_base_info(struct hfi1_filedata *fd, void __user *ubase, - __u32 len); +static int get_ctxt_info(struct hfi1_filedata *fd, unsigned long arg, u32 len); +static int get_base_info(struct hfi1_filedata *fd, unsigned long arg, u32 len); +static int user_exp_rcv_setup(struct hfi1_filedata *fd, unsigned long arg, + u32 len); +static int user_exp_rcv_clear(struct hfi1_filedata *fd, unsigned long arg, + u32 len); +static int user_exp_rcv_invalid(struct hfi1_filedata *fd, unsigned long arg, + u32 len); static int setup_base_ctxt(struct hfi1_filedata *fd, struct hfi1_ctxtdata *uctxt); static int setup_subctxt(struct hfi1_ctxtdata *uctxt); @@ -101,10 +105,11 @@ static void deallocate_ctxt(struct hfi1_ctxtdata *uctxt); static unsigned int poll_urgent(struct file *fp, struct poll_table_struct *pt); static unsigned int poll_next(struct file *fp, struct poll_table_struct *pt); static int user_event_ack(struct hfi1_ctxtdata *uctxt, u16 subctxt, - unsigned long events); -static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, u16 subctxt, u16 pkey); + unsigned long arg); +static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned long arg); +static int ctxt_reset(struct hfi1_ctxtdata *uctxt); static int manage_rcvq(struct hfi1_ctxtdata *uctxt, u16 subctxt, - int start_stop); + unsigned long arg); static int vma_fault(struct vm_fault *vmf); static long hfi1_file_ioctl(struct file *fp, unsigned int cmd, unsigned long arg); @@ -221,13 +226,8 @@ static long hfi1_file_ioctl(struct file *fp, unsigned int cmd, { 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; hfi1_cdbg(IOCTL, "IOCTL recv: 0x%x", cmd); if (cmd != HFI1_IOCTL_ASSIGN_CTXT && @@ -237,171 +237,55 @@ static long hfi1_file_ioctl(struct file *fp, unsigned int cmd, switch (cmd) { case HFI1_IOCTL_ASSIGN_CTXT: - if (uctxt) - return -EINVAL; - - if (copy_from_user(&uinfo, - (struct hfi1_user_info __user *)arg, - sizeof(uinfo))) - return -EFAULT; - - ret = assign_ctxt(fd, &uinfo); + ret = assign_ctxt(fd, arg, _IOC_SIZE(cmd)); break; + case HFI1_IOCTL_CTXT_INFO: - ret = get_ctxt_info(fd, (void __user *)(unsigned long)arg, - sizeof(struct hfi1_ctxt_info)); + ret = get_ctxt_info(fd, arg, _IOC_SIZE(cmd)); break; + case HFI1_IOCTL_USER_INFO: - ret = get_base_info(fd, (void __user *)(unsigned long)arg, - sizeof(struct hfi1_base_info)); + ret = get_base_info(fd, arg, _IOC_SIZE(cmd)); break; + case HFI1_IOCTL_CREDIT_UPD: if (uctxt) 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(fd, &tinfo); - if (!ret) { - /* - * Copy the number of tidlist entries we used - * and the length of the buffer we registered. - */ - addr = arg + offsetof(struct hfi1_tid_info, tidcnt); - if (copy_to_user((void __user *)addr, &tinfo.tidcnt, - sizeof(tinfo.tidcnt))) - return -EFAULT; - - addr = arg + offsetof(struct hfi1_tid_info, length); - if (copy_to_user((void __user *)addr, &tinfo.length, - sizeof(tinfo.length))) - ret = -EFAULT; - } + ret = user_exp_rcv_setup(fd, arg, _IOC_SIZE(cmd)); 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(fd, &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; + ret = user_exp_rcv_clear(fd, arg, _IOC_SIZE(cmd)); 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(fd, &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; + ret = user_exp_rcv_invalid(fd, arg, _IOC_SIZE(cmd)); 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); + ret = manage_rcvq(uctxt, fd->subctxt, arg); break; case HFI1_IOCTL_POLL_TYPE: - ret = get_user(uval, (int __user *)arg); - if (ret != 0) + if (get_user(uval, (int __user *)arg)) 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); + ret = user_event_ack(uctxt, fd->subctxt, arg); 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; + ret = set_ctxt_pkey(uctxt, arg); 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); - } else { - ret = sc_restart(sc); - } - if (!ret) - sc_return_credits(sc); + case HFI1_IOCTL_CTXT_RESET: + ret = ctxt_reset(uctxt); break; - } case HFI1_IOCTL_GET_VERS: uval = HFI1_USER_SWVERSION; @@ -595,9 +479,8 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma) * Use the page where this context's flags are. User level * knows where it's own bitmap is within the page. */ - memaddr = (unsigned long)(dd->events + - ((uctxt->ctxt - dd->first_dyn_alloc_ctxt) * - HFI1_MAX_SHARED_CTXTS)) & PAGE_MASK; + memaddr = (unsigned long) + (dd->events + uctxt_offset(uctxt)) & PAGE_MASK; memlen = PAGE_SIZE; /* * v3.7 removes VM_RESERVED but the effect is kept by @@ -779,8 +662,7 @@ static int hfi1_file_close(struct inode *inode, struct file *fp) * Clear any left over, unhandled events so the next process that * gets this context doesn't get confused. */ - ev = dd->events + ((uctxt->ctxt - dd->first_dyn_alloc_ctxt) * - HFI1_MAX_SHARED_CTXTS) + fdata->subctxt; + ev = dd->events + uctxt_offset(uctxt) + fdata->subctxt; *ev = 0; spin_lock_irqsave(&dd->uctxt_lock, flags); @@ -891,21 +773,29 @@ static int complete_subctxt(struct hfi1_filedata *fd) return ret; } -static int assign_ctxt(struct hfi1_filedata *fd, struct hfi1_user_info *uinfo) +static int assign_ctxt(struct hfi1_filedata *fd, unsigned long arg, u32 len) { int ret; - unsigned int swmajor, swminor; + unsigned int swmajor; struct hfi1_ctxtdata *uctxt = NULL; + struct hfi1_user_info uinfo; + + if (fd->uctxt) + return -EINVAL; + + if (sizeof(uinfo) != len) + return -EINVAL; - swmajor = uinfo->userversion >> 16; + if (copy_from_user(&uinfo, (void __user *)arg, sizeof(uinfo))) + return -EFAULT; + + swmajor = uinfo.userversion >> 16; if (swmajor != HFI1_USER_SWMAJOR) return -ENODEV; - if (uinfo->subctxt_cnt > HFI1_MAX_SHARED_CTXTS) + if (uinfo.subctxt_cnt > HFI1_MAX_SHARED_CTXTS) return -EINVAL; - swminor = uinfo->userversion & 0xffff; - /* * Acquire the mutex to protect against multiple creations of what * could be a shared base context. @@ -915,14 +805,14 @@ static int assign_ctxt(struct hfi1_filedata *fd, struct hfi1_user_info *uinfo) * Get a sub context if available (fd->uctxt will be set). * ret < 0 error, 0 no context, 1 sub-context found */ - ret = find_sub_ctxt(fd, uinfo); + ret = find_sub_ctxt(fd, &uinfo); /* * Allocate a base context if context sharing is not required or a * sub context wasn't found. */ if (!ret) - ret = allocate_ctxt(fd, fd->dd, uinfo, &uctxt); + ret = allocate_ctxt(fd, fd->dd, &uinfo, &uctxt); mutex_unlock(&hfi1_mutex); @@ -1230,12 +1120,13 @@ static void user_init(struct hfi1_ctxtdata *uctxt) hfi1_rcvctrl(uctxt->dd, rcvctrl_ops, uctxt); } -static int get_ctxt_info(struct hfi1_filedata *fd, void __user *ubase, - __u32 len) +static int get_ctxt_info(struct hfi1_filedata *fd, unsigned long arg, u32 len) { struct hfi1_ctxt_info cinfo; struct hfi1_ctxtdata *uctxt = fd->uctxt; - int ret = 0; + + if (sizeof(cinfo) != len) + return -EINVAL; memset(&cinfo, 0, sizeof(cinfo)); cinfo.runtime_flags = (((uctxt->flags >> HFI1_CAP_MISC_SHIFT) & @@ -1265,10 +1156,10 @@ static int get_ctxt_info(struct hfi1_filedata *fd, void __user *ubase, cinfo.rcvegr_size = uctxt->egrbufs.rcvtid_size; trace_hfi1_ctxt_info(uctxt->dd, uctxt->ctxt, fd->subctxt, cinfo); - if (copy_to_user(ubase, &cinfo, sizeof(cinfo))) - ret = -EFAULT; + if (copy_to_user((void __user *)arg, &cinfo, len)) + return -EFAULT; - return ret; + return 0; } static int init_user_ctxt(struct hfi1_filedata *fd, @@ -1344,18 +1235,18 @@ done: return ret; } -static int get_base_info(struct hfi1_filedata *fd, void __user *ubase, - __u32 len) +static int get_base_info(struct hfi1_filedata *fd, unsigned long arg, u32 len) { struct hfi1_base_info binfo; struct hfi1_ctxtdata *uctxt = fd->uctxt; struct hfi1_devdata *dd = uctxt->dd; - ssize_t sz; unsigned offset; - int ret = 0; trace_hfi1_uctxtdata(uctxt->dd, uctxt, fd->subctxt); + if (sizeof(binfo) != len) + return -EINVAL; + memset(&binfo, 0, sizeof(binfo)); binfo.hw_version = dd->revision; binfo.sw_version = HFI1_KERN_SWVERSION; @@ -1385,39 +1276,152 @@ static int get_base_info(struct hfi1_filedata *fd, void __user *ubase, fd->subctxt, uctxt->egrbufs.rcvtids[0].dma); binfo.sdma_comp_bufbase = HFI1_MMAP_TOKEN(SDMA_COMP, uctxt->ctxt, - fd->subctxt, 0); + fd->subctxt, 0); /* * user regs are at * (RXE_PER_CONTEXT_USER + (ctxt * RXE_PER_CONTEXT_SIZE)) */ binfo.user_regbase = HFI1_MMAP_TOKEN(UREGS, uctxt->ctxt, - fd->subctxt, 0); - offset = offset_in_page((((uctxt->ctxt - dd->first_dyn_alloc_ctxt) * - HFI1_MAX_SHARED_CTXTS) + fd->subctxt) * - sizeof(*dd->events)); + fd->subctxt, 0); + offset = offset_in_page((uctxt_offset(uctxt) + fd->subctxt) * + sizeof(*dd->events)); binfo.events_bufbase = HFI1_MMAP_TOKEN(EVENTS, uctxt->ctxt, - fd->subctxt, - offset); + fd->subctxt, + offset); binfo.status_bufbase = HFI1_MMAP_TOKEN(STATUS, uctxt->ctxt, - fd->subctxt, - dd->status); + fd->subctxt, + dd->status); if (HFI1_CAP_IS_USET(DMA_RTAIL)) binfo.rcvhdrtail_base = HFI1_MMAP_TOKEN(RTAIL, uctxt->ctxt, - fd->subctxt, 0); + fd->subctxt, 0); if (uctxt->subctxt_cnt) { binfo.subctxt_uregbase = HFI1_MMAP_TOKEN(SUBCTXT_UREGS, - uctxt->ctxt, - fd->subctxt, 0); - binfo.subctxt_rcvhdrbuf = HFI1_MMAP_TOKEN(SUBCTXT_RCV_HDRQ, uctxt->ctxt, fd->subctxt, 0); + binfo.subctxt_rcvhdrbuf = HFI1_MMAP_TOKEN(SUBCTXT_RCV_HDRQ, + uctxt->ctxt, + fd->subctxt, 0); binfo.subctxt_rcvegrbuf = HFI1_MMAP_TOKEN(SUBCTXT_EGRBUF, - uctxt->ctxt, - fd->subctxt, 0); + uctxt->ctxt, + fd->subctxt, 0); } - sz = (len < sizeof(binfo)) ? len : sizeof(binfo); - if (copy_to_user(ubase, &binfo, sz)) + + if (copy_to_user((void __user *)arg, &binfo, len)) + return -EFAULT; + + return 0; +} + +/** + * user_exp_rcv_setup - Set up the given tid rcv list + * @fd: file data of the current driver instance + * @arg: ioctl argumnent for user space information + * @len: length of data structure associated with ioctl command + * + * Wrapper to validate ioctl information before doing _rcv_setup. + * + */ +static int user_exp_rcv_setup(struct hfi1_filedata *fd, unsigned long arg, + u32 len) +{ + int ret; + unsigned long addr; + struct hfi1_tid_info tinfo; + + if (sizeof(tinfo) != len) + return -EINVAL; + + if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo)))) + return -EFAULT; + + ret = hfi1_user_exp_rcv_setup(fd, &tinfo); + if (!ret) { + /* + * Copy the number of tidlist entries we used + * and the length of the buffer we registered. + */ + addr = arg + offsetof(struct hfi1_tid_info, tidcnt); + if (copy_to_user((void __user *)addr, &tinfo.tidcnt, + sizeof(tinfo.tidcnt))) + return -EFAULT; + + addr = arg + offsetof(struct hfi1_tid_info, length); + if (copy_to_user((void __user *)addr, &tinfo.length, + sizeof(tinfo.length))) + ret = -EFAULT; + } + + return ret; +} + +/** + * user_exp_rcv_clear - Clear the given tid rcv list + * @fd: file data of the current driver instance + * @arg: ioctl argumnent for user space information + * @len: length of data structure associated with ioctl command + * + * The hfi1_user_exp_rcv_clear() can be called from the error path. Because + * of this, we need to use this wrapper to copy the user space information + * before doing the clear. + */ +static int user_exp_rcv_clear(struct hfi1_filedata *fd, unsigned long arg, + u32 len) +{ + int ret; + unsigned long addr; + struct hfi1_tid_info tinfo; + + if (sizeof(tinfo) != len) + return -EINVAL; + + if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo)))) + return -EFAULT; + + ret = hfi1_user_exp_rcv_clear(fd, &tinfo); + if (!ret) { + addr = arg + offsetof(struct hfi1_tid_info, tidcnt); + if (copy_to_user((void __user *)addr, &tinfo.tidcnt, + sizeof(tinfo.tidcnt))) + return -EFAULT; + } + + return ret; +} + +/** + * user_exp_rcv_invalid - Invalidate the given tid rcv list + * @fd: file data of the current driver instance + * @arg: ioctl argumnent for user space information + * @len: length of data structure associated with ioctl command + * + * Wrapper to validate ioctl information before doing _rcv_invalid. + * + */ +static int user_exp_rcv_invalid(struct hfi1_filedata *fd, unsigned long arg, + u32 len) +{ + int ret; + unsigned long addr; + struct hfi1_tid_info tinfo; + + if (sizeof(tinfo) != len) + return -EINVAL; + + if (!fd->invalid_tids) + return -EINVAL; + + if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo)))) + return -EFAULT; + + ret = hfi1_user_exp_rcv_invalid(fd, &tinfo); + if (ret) + return ret; + + addr = arg + offsetof(struct hfi1_tid_info, tidcnt); + if (copy_to_user((void __user *)addr, &tinfo.tidcnt, + sizeof(tinfo.tidcnt))) ret = -EFAULT; + return ret; } @@ -1485,14 +1489,13 @@ int hfi1_set_uevent_bits(struct hfi1_pportdata *ppd, const int evtbit) ctxt++) { uctxt = hfi1_rcd_get_by_index(dd, ctxt); if (uctxt) { - unsigned long *evs = dd->events + - (uctxt->ctxt - dd->first_dyn_alloc_ctxt) * - HFI1_MAX_SHARED_CTXTS; + unsigned long *evs; int i; /* * subctxt_cnt is 0 if not shared, so do base * separately, first, then remaining subctxt, if any */ + evs = dd->events + uctxt_offset(uctxt); set_bit(evtbit, evs); for (i = 1; i < uctxt->subctxt_cnt; i++) set_bit(evtbit, evs + i); @@ -1514,13 +1517,18 @@ int hfi1_set_uevent_bits(struct hfi1_pportdata *ppd, const int evtbit) * re-init the software copy of the head register */ static int manage_rcvq(struct hfi1_ctxtdata *uctxt, u16 subctxt, - int start_stop) + unsigned long arg) { struct hfi1_devdata *dd = uctxt->dd; unsigned int rcvctrl_op; + int start_stop; if (subctxt) - goto bail; + return 0; + + if (get_user(start_stop, (int __user *)arg)) + return -EFAULT; + /* atomically clear receive enable ctxt. */ if (start_stop) { /* @@ -1539,7 +1547,7 @@ static int manage_rcvq(struct hfi1_ctxtdata *uctxt, u16 subctxt, } hfi1_rcvctrl(dd, rcvctrl_op, uctxt); /* always; new head should be equal to new tail; see above */ -bail: + return 0; } @@ -1549,17 +1557,20 @@ bail: * set, if desired, and checks again in future. */ static int user_event_ack(struct hfi1_ctxtdata *uctxt, u16 subctxt, - unsigned long events) + unsigned long arg) { int i; struct hfi1_devdata *dd = uctxt->dd; unsigned long *evs; + unsigned long events; if (!dd->events) return 0; - evs = dd->events + ((uctxt->ctxt - dd->first_dyn_alloc_ctxt) * - HFI1_MAX_SHARED_CTXTS) + subctxt; + if (get_user(events, (unsigned long __user *)arg)) + return -EFAULT; + + evs = dd->events + uctxt_offset(uctxt) + subctxt; for (i = 0; i <= _HFI1_MAX_EVENT_BIT; i++) { if (!test_bit(i, &events)) @@ -1569,26 +1580,89 @@ static int user_event_ack(struct hfi1_ctxtdata *uctxt, u16 subctxt, return 0; } -static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, u16 subctxt, u16 pkey) +static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned long arg) { - int ret = -ENOENT, i, intable = 0; + int i; struct hfi1_pportdata *ppd = uctxt->ppd; struct hfi1_devdata *dd = uctxt->dd; + u16 pkey; - if (pkey == LIM_MGMT_P_KEY || pkey == FULL_MGMT_P_KEY) { - ret = -EINVAL; - goto done; - } + if (!HFI1_CAP_IS_USET(PKEY_CHECK)) + return -EPERM; + + if (get_user(pkey, (u16 __user *)arg)) + return -EFAULT; + + if (pkey == LIM_MGMT_P_KEY || pkey == FULL_MGMT_P_KEY) + return -EINVAL; for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) - if (pkey == ppd->pkeys[i]) { - intable = 1; - break; - } + if (pkey == ppd->pkeys[i]) + return hfi1_set_ctxt_pkey(dd, uctxt, pkey); + + return -ENOENT; +} + +/** + * ctxt_reset - Reset the user context + * @uctxt: valid user context + */ +static int ctxt_reset(struct hfi1_ctxtdata *uctxt) +{ + struct send_context *sc; + struct hfi1_devdata *dd; + int ret = 0; + + 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, + !(READ_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); + } else { + ret = sc_restart(sc); + } + if (!ret) + sc_return_credits(sc); - if (intable) - ret = hfi1_set_ctxt_pkey(dd, uctxt, pkey); -done: return ret; } |