diff options
Diffstat (limited to 'drivers/infiniband/hw/hfi1/file_ops.c')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/file_ops.c | 1498 |
1 files changed, 1498 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hfi1/file_ops.c b/drivers/infiniband/hw/hfi1/file_ops.c new file mode 100644 index 0000000..7a5b0e6 --- /dev/null +++ b/drivers/infiniband/hw/hfi1/file_ops.c @@ -0,0 +1,1498 @@ +/* + * Copyright(c) 2015, 2016 Intel Corporation. + * + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License 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. + * + * BSD LICENSE + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * - Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * - Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * - Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ +#include <linux/poll.h> +#include <linux/cdev.h> +#include <linux/vmalloc.h> +#include <linux/io.h> + +#include <rdma/ib.h> + +#include "hfi.h" +#include "pio.h" +#include "device.h" +#include "common.h" +#include "trace.h" +#include "user_sdma.h" +#include "user_exp_rcv.h" +#include "eprom.h" +#include "aspm.h" +#include "mmu_rb.h" + +#undef pr_fmt +#define pr_fmt(fmt) DRIVER_NAME ": " fmt + +#define SEND_CTXT_HALT_TIMEOUT 1000 /* msecs */ + +/* + * File operation functions + */ +static int hfi1_file_open(struct inode *, struct file *); +static int hfi1_file_close(struct inode *, struct file *); +static ssize_t hfi1_write_iter(struct kiocb *, struct iov_iter *); +static unsigned int hfi1_poll(struct file *, struct poll_table_struct *); +static int hfi1_file_mmap(struct file *, struct vm_area_struct *); + +static u64 kvirt_to_phys(void *); +static int assign_ctxt(struct file *, struct hfi1_user_info *); +static int init_subctxts(struct hfi1_ctxtdata *, const struct hfi1_user_info *); +static int user_init(struct file *); +static int get_ctxt_info(struct file *, void __user *, __u32); +static int get_base_info(struct file *, void __user *, __u32); +static int setup_ctxt(struct file *); +static int setup_subctxt(struct hfi1_ctxtdata *); +static int get_user_context(struct file *, struct hfi1_user_info *, int); +static int find_shared_ctxt(struct file *, const struct hfi1_user_info *); +static int allocate_ctxt(struct file *, struct hfi1_devdata *, + struct hfi1_user_info *); +static unsigned int poll_urgent(struct file *, struct poll_table_struct *); +static unsigned int poll_next(struct file *, struct poll_table_struct *); +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, + .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, +}; + +static struct vm_operations_struct vm_ops = { + .fault = vma_fault, +}; + +/* + * Types of memories mapped into user processes' space + */ +enum mmap_types { + PIO_BUFS = 1, + PIO_BUFS_SOP, + PIO_CRED, + RCV_HDRQ, + RCV_EGRBUF, + UREGS, + EVENTS, + STATUS, + RTAIL, + SUBCTXT_UREGS, + SUBCTXT_RCV_HDRQ, + SUBCTXT_EGRBUF, + SDMA_COMP +}; + +/* + * Masks and offsets defining the mmap tokens + */ +#define HFI1_MMAP_OFFSET_MASK 0xfffULL +#define HFI1_MMAP_OFFSET_SHIFT 0 +#define HFI1_MMAP_SUBCTXT_MASK 0xfULL +#define HFI1_MMAP_SUBCTXT_SHIFT 12 +#define HFI1_MMAP_CTXT_MASK 0xffULL +#define HFI1_MMAP_CTXT_SHIFT 16 +#define HFI1_MMAP_TYPE_MASK 0xfULL +#define HFI1_MMAP_TYPE_SHIFT 24 +#define HFI1_MMAP_MAGIC_MASK 0xffffffffULL +#define HFI1_MMAP_MAGIC_SHIFT 32 + +#define HFI1_MMAP_MAGIC 0xdabbad00 + +#define HFI1_MMAP_TOKEN_SET(field, val) \ + (((val) & HFI1_MMAP_##field##_MASK) << HFI1_MMAP_##field##_SHIFT) +#define HFI1_MMAP_TOKEN_GET(field, token) \ + (((token) >> HFI1_MMAP_##field##_SHIFT) & HFI1_MMAP_##field##_MASK) +#define HFI1_MMAP_TOKEN(type, ctxt, subctxt, addr) \ + (HFI1_MMAP_TOKEN_SET(MAGIC, HFI1_MMAP_MAGIC) | \ + HFI1_MMAP_TOKEN_SET(TYPE, type) | \ + HFI1_MMAP_TOKEN_SET(CTXT, ctxt) | \ + HFI1_MMAP_TOKEN_SET(SUBCTXT, subctxt) | \ + HFI1_MMAP_TOKEN_SET(OFFSET, (offset_in_page(addr)))) + +#define dbg(fmt, ...) \ + pr_info(fmt, ##__VA_ARGS__) + +static inline int is_valid_mmap(u64 token) +{ + return (HFI1_MMAP_TOKEN_GET(MAGIC, token) == HFI1_MMAP_MAGIC); +} + +static int hfi1_file_open(struct inode *inode, struct file *fp) +{ + struct hfi1_devdata *dd = container_of(inode->i_cdev, + struct hfi1_devdata, + user_cdev); + + /* Just take a ref now. Not all opens result in a context assign */ + kobject_get(&dd->kobj); + + /* The real work is performed later in assign_ctxt() */ + fp->private_data = kzalloc(sizeof(struct hfi1_filedata), GFP_KERNEL); + if (fp->private_data) /* no cpu affinity by default */ + ((struct hfi1_filedata *)fp->private_data)->rec_cpu_num = -1; + 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; + + hfi1_cdbg(IOCTL, "IOCTL recv: 0x%x", cmd); + 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_write_iter(struct kiocb *kiocb, struct iov_iter *from) +{ + struct hfi1_filedata *fd = kiocb->ki_filp->private_data; + struct hfi1_user_sdma_pkt_q *pq = fd->pq; + struct hfi1_user_sdma_comp_q *cq = fd->cq; + int ret = 0, done = 0, reqs = 0; + unsigned long dim = from->nr_segs; + + if (!cq || !pq) { + ret = -EIO; + goto done; + } + + if (!iter_is_iovec(from) || !dim) { + ret = -EINVAL; + goto done; + } + + hfi1_cdbg(SDMA, "SDMA request from %u:%u (%lu)", + fd->uctxt->ctxt, fd->subctxt, dim); + + if (atomic_read(&pq->n_reqs) == pq->n_max_reqs) { + ret = -ENOSPC; + goto done; + } + + while (dim) { + unsigned long count = 0; + + ret = hfi1_user_sdma_process_request( + kiocb->ki_filp, (struct iovec *)(from->iov + done), + dim, &count); + if (ret) + goto done; + dim -= count; + done += count; + reqs++; + } +done: + return ret ? ret : reqs; +} + +static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma) +{ + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + struct hfi1_devdata *dd; + unsigned long flags, pfn; + u64 token = vma->vm_pgoff << PAGE_SHIFT, + memaddr = 0; + u8 subctxt, mapio = 0, vmf = 0, type; + ssize_t memlen = 0; + int ret = 0; + u16 ctxt; + + if (!is_valid_mmap(token) || !uctxt || + !(vma->vm_flags & VM_SHARED)) { + ret = -EINVAL; + goto done; + } + dd = uctxt->dd; + ctxt = HFI1_MMAP_TOKEN_GET(CTXT, token); + subctxt = HFI1_MMAP_TOKEN_GET(SUBCTXT, token); + type = HFI1_MMAP_TOKEN_GET(TYPE, token); + if (ctxt != uctxt->ctxt || subctxt != fd->subctxt) { + ret = -EINVAL; + goto done; + } + + flags = vma->vm_flags; + + switch (type) { + case PIO_BUFS: + case PIO_BUFS_SOP: + memaddr = ((dd->physaddr + TXE_PIO_SEND) + + /* chip pio base */ + (uctxt->sc->hw_context * BIT(16))) + + /* 64K PIO space / ctxt */ + (type == PIO_BUFS_SOP ? + (TXE_PIO_SIZE / 2) : 0); /* sop? */ + /* + * Map only the amount allocated to the context, not the + * entire available context's PIO space. + */ + memlen = PAGE_ALIGN(uctxt->sc->credits * PIO_BLOCK_SIZE); + flags &= ~VM_MAYREAD; + flags |= VM_DONTCOPY | VM_DONTEXPAND; + vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); + mapio = 1; + break; + case PIO_CRED: + if (flags & VM_WRITE) { + ret = -EPERM; + goto done; + } + /* + * The credit return location for this context could be on the + * second or third page allocated for credit returns (if number + * of enabled contexts > 64 and 128 respectively). + */ + memaddr = dd->cr_base[uctxt->numa_id].pa + + (((u64)uctxt->sc->hw_free - + (u64)dd->cr_base[uctxt->numa_id].va) & PAGE_MASK); + memlen = PAGE_SIZE; + flags &= ~VM_MAYWRITE; + flags |= VM_DONTCOPY | VM_DONTEXPAND; + /* + * The driver has already allocated memory for credit + * returns and programmed it into the chip. Has that + * memory been flagged as non-cached? + */ + /* vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); */ + mapio = 1; + break; + case RCV_HDRQ: + memaddr = uctxt->rcvhdrq_phys; + memlen = uctxt->rcvhdrq_size; + break; + case RCV_EGRBUF: { + unsigned long addr; + int i; + /* + * The RcvEgr buffer need to be handled differently + * as multiple non-contiguous pages need to be mapped + * into the user process. + */ + memlen = uctxt->egrbufs.size; + if ((vma->vm_end - vma->vm_start) != memlen) { + dd_dev_err(dd, "Eager buffer map size invalid (%lu != %lu)\n", + (vma->vm_end - vma->vm_start), memlen); + ret = -EINVAL; + goto done; + } + if (vma->vm_flags & VM_WRITE) { + ret = -EPERM; + goto done; + } + vma->vm_flags &= ~VM_MAYWRITE; + addr = vma->vm_start; + for (i = 0 ; i < uctxt->egrbufs.numbufs; i++) { + ret = remap_pfn_range( + vma, addr, + uctxt->egrbufs.buffers[i].phys >> PAGE_SHIFT, + uctxt->egrbufs.buffers[i].len, + vma->vm_page_prot); + if (ret < 0) + goto done; + addr += uctxt->egrbufs.buffers[i].len; + } + ret = 0; + goto done; + } + case UREGS: + /* + * Map only the page that contains this context's user + * registers. + */ + memaddr = (unsigned long) + (dd->physaddr + RXE_PER_CONTEXT_USER) + + (uctxt->ctxt * RXE_PER_CONTEXT_SIZE); + /* + * TidFlow table is on the same page as the rest of the + * user registers. + */ + memlen = PAGE_SIZE; + flags |= VM_DONTCOPY | VM_DONTEXPAND; + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + mapio = 1; + break; + case EVENTS: + /* + * 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_user_ctxt) * + HFI1_MAX_SHARED_CTXTS)) & PAGE_MASK; + memlen = PAGE_SIZE; + /* + * v3.7 removes VM_RESERVED but the effect is kept by + * using VM_IO. + */ + flags |= VM_IO | VM_DONTEXPAND; + vmf = 1; + break; + case STATUS: + memaddr = kvirt_to_phys((void *)dd->status); + memlen = PAGE_SIZE; + flags |= VM_IO | VM_DONTEXPAND; + break; + case RTAIL: + if (!HFI1_CAP_IS_USET(DMA_RTAIL)) { + /* + * If the memory allocation failed, the context alloc + * also would have failed, so we would never get here + */ + ret = -EINVAL; + goto done; + } + if (flags & VM_WRITE) { + ret = -EPERM; + goto done; + } + memaddr = uctxt->rcvhdrqtailaddr_phys; + memlen = PAGE_SIZE; + flags &= ~VM_MAYWRITE; + break; + case SUBCTXT_UREGS: + memaddr = (u64)uctxt->subctxt_uregbase; + memlen = PAGE_SIZE; + flags |= VM_IO | VM_DONTEXPAND; + vmf = 1; + break; + case SUBCTXT_RCV_HDRQ: + memaddr = (u64)uctxt->subctxt_rcvhdr_base; + memlen = uctxt->rcvhdrq_size * uctxt->subctxt_cnt; + flags |= VM_IO | VM_DONTEXPAND; + vmf = 1; + break; + case SUBCTXT_EGRBUF: + memaddr = (u64)uctxt->subctxt_rcvegrbuf; + memlen = uctxt->egrbufs.size * uctxt->subctxt_cnt; + flags |= VM_IO | VM_DONTEXPAND; + flags &= ~VM_MAYWRITE; + vmf = 1; + break; + case SDMA_COMP: { + struct hfi1_user_sdma_comp_q *cq = fd->cq; + + if (!cq) { + ret = -EFAULT; + goto done; + } + memaddr = (u64)cq->comps; + memlen = PAGE_ALIGN(sizeof(*cq->comps) * cq->nentries); + flags |= VM_IO | VM_DONTEXPAND; + vmf = 1; + break; + } + default: + ret = -EINVAL; + break; + } + + if ((vma->vm_end - vma->vm_start) != memlen) { + hfi1_cdbg(PROC, "%u:%u Memory size mismatch %lu:%lu", + uctxt->ctxt, fd->subctxt, + (vma->vm_end - vma->vm_start), memlen); + ret = -EINVAL; + goto done; + } + + vma->vm_flags = flags; + hfi1_cdbg(PROC, + "%u:%u type:%u io/vf:%d/%d, addr:0x%llx, len:%lu(%lu), flags:0x%lx\n", + ctxt, subctxt, type, mapio, vmf, memaddr, memlen, + vma->vm_end - vma->vm_start, vma->vm_flags); + pfn = (unsigned long)(memaddr >> PAGE_SHIFT); + if (vmf) { + vma->vm_pgoff = pfn; + vma->vm_ops = &vm_ops; + ret = 0; + } else if (mapio) { + ret = io_remap_pfn_range(vma, vma->vm_start, pfn, memlen, + vma->vm_page_prot); + } else { + ret = remap_pfn_range(vma, vma->vm_start, pfn, memlen, + vma->vm_page_prot); + } +done: + return ret; +} + +/* + * Local (non-chip) user memory is not mapped right away but as it is + * accessed by the user-level code. + */ +static int vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + struct page *page; + + page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT)); + if (!page) + return VM_FAULT_SIGBUS; + + get_page(page); + vmf->page = page; + + return 0; +} + +static unsigned int hfi1_poll(struct file *fp, struct poll_table_struct *pt) +{ + struct hfi1_ctxtdata *uctxt; + unsigned pollflag; + + uctxt = ((struct hfi1_filedata *)fp->private_data)->uctxt; + if (!uctxt) + pollflag = POLLERR; + else if (uctxt->poll_type == HFI1_POLL_TYPE_URGENT) + pollflag = poll_urgent(fp, pt); + else if (uctxt->poll_type == HFI1_POLL_TYPE_ANYRCV) + pollflag = poll_next(fp, pt); + else /* invalid */ + pollflag = POLLERR; + + return pollflag; +} + +static int hfi1_file_close(struct inode *inode, struct file *fp) +{ + struct hfi1_filedata *fdata = fp->private_data; + struct hfi1_ctxtdata *uctxt = fdata->uctxt; + struct hfi1_devdata *dd = container_of(inode->i_cdev, + struct hfi1_devdata, + user_cdev); + unsigned long flags, *ev; + + fp->private_data = NULL; + + if (!uctxt) + goto done; + + hfi1_cdbg(PROC, "freeing ctxt %u:%u", uctxt->ctxt, fdata->subctxt); + mutex_lock(&hfi1_mutex); + + flush_wc(); + /* drain user sdma queue */ + hfi1_user_sdma_free_queues(fdata); + + /* release the cpu */ + hfi1_put_proc_affinity(dd, fdata->rec_cpu_num); + + /* + * 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_user_ctxt) * + HFI1_MAX_SHARED_CTXTS) + fdata->subctxt; + *ev = 0; + + if (--uctxt->cnt) { + uctxt->active_slaves &= ~(1 << fdata->subctxt); + uctxt->subpid[fdata->subctxt] = 0; + mutex_unlock(&hfi1_mutex); + goto done; + } + + spin_lock_irqsave(&dd->uctxt_lock, flags); + /* + * Disable receive context and interrupt available, reset all + * RcvCtxtCtrl bits to default values. + */ + hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_DIS | + HFI1_RCVCTRL_TIDFLOW_DIS | + HFI1_RCVCTRL_INTRAVAIL_DIS | + HFI1_RCVCTRL_TAILUPD_DIS | + HFI1_RCVCTRL_ONE_PKT_EGR_DIS | + HFI1_RCVCTRL_NO_RHQ_DROP_DIS | + HFI1_RCVCTRL_NO_EGR_DROP_DIS, uctxt->ctxt); + /* Clear the context's J_KEY */ + hfi1_clear_ctxt_jkey(dd, uctxt->ctxt); + /* + * Reset context integrity checks to default. + * (writes to CSRs probably belong in chip.c) + */ + write_kctxt_csr(dd, uctxt->sc->hw_context, SEND_CTXT_CHECK_ENABLE, + hfi1_pkt_default_send_ctxt_mask(dd, uctxt->sc->type)); + sc_disable(uctxt->sc); + uctxt->pid = 0; + spin_unlock_irqrestore(&dd->uctxt_lock, flags); + + dd->rcd[uctxt->ctxt] = NULL; + + hfi1_user_exp_rcv_free(fdata); + hfi1_clear_ctxt_pkey(dd, uctxt->ctxt); + + uctxt->rcvwait_to = 0; + uctxt->piowait_to = 0; + uctxt->rcvnowait = 0; + uctxt->pionowait = 0; + uctxt->event_flags = 0; + + hfi1_stats.sps_ctxts--; + if (++dd->freectxts == dd->num_user_contexts) + aspm_enable_all(dd); + mutex_unlock(&hfi1_mutex); + hfi1_free_ctxtdata(dd, uctxt); +done: + kobject_put(&dd->kobj); + kfree(fdata); + return 0; +} + +/* + * Convert kernel *virtual* addresses to physical addresses. + * This is used to vmalloc'ed addresses. + */ +static u64 kvirt_to_phys(void *addr) +{ + struct page *page; + u64 paddr = 0; + + page = vmalloc_to_page(addr); + if (page) + paddr = page_to_pfn(page) << PAGE_SHIFT; + + return paddr; +} + +static int assign_ctxt(struct file *fp, struct hfi1_user_info *uinfo) +{ + int i_minor, ret = 0; + unsigned int swmajor, swminor; + + swmajor = uinfo->userversion >> 16; + if (swmajor != HFI1_USER_SWMAJOR) { + ret = -ENODEV; + goto done; + } + + swminor = uinfo->userversion & 0xffff; + + mutex_lock(&hfi1_mutex); + /* First, lets check if we need to setup a shared context? */ + if (uinfo->subctxt_cnt) { + struct hfi1_filedata *fd = fp->private_data; + + ret = find_shared_ctxt(fp, uinfo); + if (ret < 0) + goto done_unlock; + if (ret) + fd->rec_cpu_num = hfi1_get_proc_affinity( + fd->uctxt->dd, fd->uctxt->numa_id); + } + + /* + * We execute the following block if we couldn't find a + * shared context or if context sharing is not required. + */ + if (!ret) { + i_minor = iminor(file_inode(fp)) - HFI1_USER_MINOR_BASE; + ret = get_user_context(fp, uinfo, i_minor); + } +done_unlock: + mutex_unlock(&hfi1_mutex); +done: + return ret; +} + +static int get_user_context(struct file *fp, struct hfi1_user_info *uinfo, + int devno) +{ + struct hfi1_devdata *dd = NULL; + int devmax, npresent, nup; + + devmax = hfi1_count_units(&npresent, &nup); + if (!npresent) + return -ENXIO; + + if (!nup) + return -ENETDOWN; + + dd = hfi1_lookup(devno); + if (!dd) + return -ENODEV; + else if (!dd->freectxts) + return -EBUSY; + + return allocate_ctxt(fp, dd, uinfo); +} + +static int find_shared_ctxt(struct file *fp, + const struct hfi1_user_info *uinfo) +{ + int devmax, ndev, i; + int ret = 0; + struct hfi1_filedata *fd = fp->private_data; + + devmax = hfi1_count_units(NULL, NULL); + + for (ndev = 0; ndev < devmax; ndev++) { + struct hfi1_devdata *dd = hfi1_lookup(ndev); + + if (!(dd && (dd->flags & HFI1_PRESENT) && dd->kregbase)) + continue; + for (i = dd->first_user_ctxt; i < dd->num_rcv_contexts; i++) { + struct hfi1_ctxtdata *uctxt = dd->rcd[i]; + + /* Skip ctxts which are not yet open */ + if (!uctxt || !uctxt->cnt) + continue; + /* Skip ctxt if it doesn't match the requested one */ + if (memcmp(uctxt->uuid, uinfo->uuid, + sizeof(uctxt->uuid)) || + uctxt->jkey != generate_jkey(current_uid()) || + uctxt->subctxt_id != uinfo->subctxt_id || + uctxt->subctxt_cnt != uinfo->subctxt_cnt) + continue; + + /* Verify the sharing process matches the master */ + if (uctxt->userversion != uinfo->userversion || + uctxt->cnt >= uctxt->subctxt_cnt) { + ret = -EINVAL; + goto done; + } + fd->uctxt = uctxt; + fd->subctxt = uctxt->cnt++; + uctxt->subpid[fd->subctxt] = current->pid; + uctxt->active_slaves |= 1 << fd->subctxt; + ret = 1; + goto done; + } + } + +done: + return ret; +} + +static int allocate_ctxt(struct file *fp, struct hfi1_devdata *dd, + struct hfi1_user_info *uinfo) +{ + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt; + unsigned ctxt; + int ret, numa; + + if (dd->flags & HFI1_FROZEN) { + /* + * Pick an error that is unique from all other errors + * that are returned so the user process knows that + * it tried to allocate while the SPC was frozen. It + * it should be able to retry with success in a short + * while. + */ + return -EIO; + } + + for (ctxt = dd->first_user_ctxt; ctxt < dd->num_rcv_contexts; ctxt++) + if (!dd->rcd[ctxt]) + break; + + if (ctxt == dd->num_rcv_contexts) + return -EBUSY; + + fd->rec_cpu_num = hfi1_get_proc_affinity(dd, -1); + if (fd->rec_cpu_num != -1) + numa = cpu_to_node(fd->rec_cpu_num); + else + numa = numa_node_id(); + uctxt = hfi1_create_ctxtdata(dd->pport, ctxt, numa); + if (!uctxt) { + dd_dev_err(dd, + "Unable to allocate ctxtdata memory, failing open\n"); + return -ENOMEM; + } + hfi1_cdbg(PROC, "[%u:%u] pid %u assigned to CPU %d (NUMA %u)", + uctxt->ctxt, fd->subctxt, current->pid, fd->rec_cpu_num, + uctxt->numa_id); + + /* + * Allocate and enable a PIO send context. + */ + uctxt->sc = sc_alloc(dd, SC_USER, uctxt->rcvhdrqentsize, + uctxt->dd->node); + if (!uctxt->sc) + return -ENOMEM; + + hfi1_cdbg(PROC, "allocated send context %u(%u)\n", uctxt->sc->sw_index, + uctxt->sc->hw_context); + ret = sc_enable(uctxt->sc); + if (ret) + return ret; + /* + * Setup shared context resources if the user-level has requested + * shared contexts and this is the 'master' process. + * This has to be done here so the rest of the sub-contexts find the + * proper master. + */ + if (uinfo->subctxt_cnt && !fd->subctxt) { + ret = init_subctxts(uctxt, uinfo); + /* + * On error, we don't need to disable and de-allocate the + * send context because it will be done during file close + */ + if (ret) + return ret; + } + uctxt->userversion = uinfo->userversion; + uctxt->pid = current->pid; + uctxt->flags = HFI1_CAP_UGET(MASK); + init_waitqueue_head(&uctxt->wait); + strlcpy(uctxt->comm, current->comm, sizeof(uctxt->comm)); + memcpy(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid)); + uctxt->jkey = generate_jkey(current_uid()); + INIT_LIST_HEAD(&uctxt->sdma_queues); + spin_lock_init(&uctxt->sdma_qlock); + hfi1_stats.sps_ctxts++; + /* + * Disable ASPM when there are open user/PSM contexts to avoid + * issues with ASPM L1 exit latency + */ + if (dd->freectxts-- == dd->num_user_contexts) + aspm_disable_all(dd); + fd->uctxt = uctxt; + + return 0; +} + +static int init_subctxts(struct hfi1_ctxtdata *uctxt, + const struct hfi1_user_info *uinfo) +{ + unsigned num_subctxts; + + num_subctxts = uinfo->subctxt_cnt; + if (num_subctxts > HFI1_MAX_SHARED_CTXTS) + return -EINVAL; + + uctxt->subctxt_cnt = uinfo->subctxt_cnt; + uctxt->subctxt_id = uinfo->subctxt_id; + uctxt->active_slaves = 1; + uctxt->redirect_seq_cnt = 1; + set_bit(HFI1_CTXT_MASTER_UNINIT, &uctxt->event_flags); + + return 0; +} + +static int setup_subctxt(struct hfi1_ctxtdata *uctxt) +{ + int ret = 0; + unsigned num_subctxts = uctxt->subctxt_cnt; + + uctxt->subctxt_uregbase = vmalloc_user(PAGE_SIZE); + if (!uctxt->subctxt_uregbase) { + ret = -ENOMEM; + goto bail; + } + /* We can take the size of the RcvHdr Queue from the master */ + uctxt->subctxt_rcvhdr_base = vmalloc_user(uctxt->rcvhdrq_size * + num_subctxts); + if (!uctxt->subctxt_rcvhdr_base) { + ret = -ENOMEM; + goto bail_ureg; + } + + uctxt->subctxt_rcvegrbuf = vmalloc_user(uctxt->egrbufs.size * + num_subctxts); + if (!uctxt->subctxt_rcvegrbuf) { + ret = -ENOMEM; + goto bail_rhdr; + } + goto bail; +bail_rhdr: + vfree(uctxt->subctxt_rcvhdr_base); +bail_ureg: + vfree(uctxt->subctxt_uregbase); + uctxt->subctxt_uregbase = NULL; +bail: + return ret; +} + +static int user_init(struct file *fp) +{ + unsigned int rcvctrl_ops = 0; + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + + /* make sure that the context has already been setup */ + if (!test_bit(HFI1_CTXT_SETUP_DONE, &uctxt->event_flags)) + return -EFAULT; + + /* initialize poll variables... */ + uctxt->urgent = 0; + uctxt->urgent_poll = 0; + + /* + * Now enable the ctxt for receive. + * For chips that are set to DMA the tail register to memory + * when they change (and when the update bit transitions from + * 0 to 1. So for those chips, we turn it off and then back on. + * This will (very briefly) affect any other open ctxts, but the + * duration is very short, and therefore isn't an issue. We + * explicitly set the in-memory tail copy to 0 beforehand, so we + * don't have to wait to be sure the DMA update has happened + * (chip resets head/tail to 0 on transition to enable). + */ + if (uctxt->rcvhdrtail_kvaddr) + clear_rcvhdrtail(uctxt); + + /* Setup J_KEY before enabling the context */ + hfi1_set_ctxt_jkey(uctxt->dd, uctxt->ctxt, uctxt->jkey); + + rcvctrl_ops = HFI1_RCVCTRL_CTXT_ENB; + if (HFI1_CAP_KGET_MASK(uctxt->flags, HDRSUPP)) + rcvctrl_ops |= HFI1_RCVCTRL_TIDFLOW_ENB; + /* + * Ignore the bit in the flags for now until proper + * support for multiple packet per rcv array entry is + * added. + */ + if (!HFI1_CAP_KGET_MASK(uctxt->flags, MULTI_PKT_EGR)) + rcvctrl_ops |= HFI1_RCVCTRL_ONE_PKT_EGR_ENB; + if (HFI1_CAP_KGET_MASK(uctxt->flags, NODROP_EGR_FULL)) + rcvctrl_ops |= HFI1_RCVCTRL_NO_EGR_DROP_ENB; + if (HFI1_CAP_KGET_MASK(uctxt->flags, NODROP_RHQ_FULL)) + rcvctrl_ops |= HFI1_RCVCTRL_NO_RHQ_DROP_ENB; + /* + * The RcvCtxtCtrl.TailUpd bit has to be explicitly written. + * We can't rely on the correct value to be set from prior + * uses of the chip or ctxt. Therefore, add the rcvctrl op + * for both cases. + */ + if (HFI1_CAP_KGET_MASK(uctxt->flags, DMA_RTAIL)) + rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_ENB; + else + rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_DIS; + hfi1_rcvctrl(uctxt->dd, rcvctrl_ops, uctxt->ctxt); + + /* Notify any waiting slaves */ + if (uctxt->subctxt_cnt) { + clear_bit(HFI1_CTXT_MASTER_UNINIT, &uctxt->event_flags); + wake_up(&uctxt->wait); + } + + return 0; +} + +static int get_ctxt_info(struct file *fp, void __user *ubase, __u32 len) +{ + struct hfi1_ctxt_info cinfo; + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + int ret = 0; + + memset(&cinfo, 0, sizeof(cinfo)); + ret = hfi1_get_base_kinfo(uctxt, &cinfo); + if (ret < 0) + goto done; + cinfo.num_active = hfi1_count_active_units(); + cinfo.unit = uctxt->dd->unit; + cinfo.ctxt = uctxt->ctxt; + cinfo.subctxt = fd->subctxt; + cinfo.rcvtids = roundup(uctxt->egrbufs.alloced, + uctxt->dd->rcv_entries.group_size) + + uctxt->expected_count; + cinfo.credits = uctxt->sc->credits; + cinfo.numa_node = uctxt->numa_id; + cinfo.rec_cpu = fd->rec_cpu_num; + cinfo.send_ctxt = uctxt->sc->hw_context; + + cinfo.egrtids = uctxt->egrbufs.alloced; + cinfo.rcvhdrq_cnt = uctxt->rcvhdrq_cnt; + cinfo.rcvhdrq_entsize = uctxt->rcvhdrqentsize << 2; + cinfo.sdma_ring_size = fd->cq->nentries; + 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; +done: + return ret; +} + +static int setup_ctxt(struct file *fp) +{ + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + struct hfi1_devdata *dd = uctxt->dd; + int ret = 0; + + /* + * Context should be set up only once, including allocation and + * programming of eager buffers. This is done if context sharing + * is not requested or by the master process. + */ + if (!uctxt->subctxt_cnt || !fd->subctxt) { + ret = hfi1_init_ctxt(uctxt->sc); + if (ret) + goto done; + + /* Now allocate the RcvHdr queue and eager buffers. */ + ret = hfi1_create_rcvhdrq(dd, uctxt); + if (ret) + goto done; + ret = hfi1_setup_eagerbufs(uctxt); + if (ret) + goto done; + if (uctxt->subctxt_cnt && !fd->subctxt) { + ret = setup_subctxt(uctxt); + if (ret) + goto done; + } + } else { + ret = wait_event_interruptible(uctxt->wait, !test_bit( + HFI1_CTXT_MASTER_UNINIT, + &uctxt->event_flags)); + if (ret) + goto done; + } + + ret = hfi1_user_sdma_alloc_queues(uctxt, fp); + if (ret) + goto done; + /* + * Expected receive has to be setup for all processes (including + * shared contexts). However, it has to be done after the master + * context has been fully configured as it depends on the + * eager/expected split of the RcvArray entries. + * Setting it up here ensures that the subcontexts will be waiting + * (due to the above wait_event_interruptible() until the master + * is setup. + */ + ret = hfi1_user_exp_rcv_init(fp); + if (ret) + goto done; + + set_bit(HFI1_CTXT_SETUP_DONE, &uctxt->event_flags); +done: + return ret; +} + +static int get_base_info(struct file *fp, void __user *ubase, __u32 len) +{ + struct hfi1_base_info binfo; + struct hfi1_filedata *fd = fp->private_data; + 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); + + memset(&binfo, 0, sizeof(binfo)); + binfo.hw_version = dd->revision; + binfo.sw_version = HFI1_KERN_SWVERSION; + binfo.bthqp = kdeth_qp; + binfo.jkey = uctxt->jkey; + /* + * If more than 64 contexts are enabled the allocated credit + * return will span two or three contiguous pages. Since we only + * map the page containing the context's credit return address, + * we need to calculate the offset in the proper page. + */ + offset = ((u64)uctxt->sc->hw_free - + (u64)dd->cr_base[uctxt->numa_id].va) % PAGE_SIZE; + binfo.sc_credits_addr = HFI1_MMAP_TOKEN(PIO_CRED, uctxt->ctxt, + fd->subctxt, offset); + binfo.pio_bufbase = HFI1_MMAP_TOKEN(PIO_BUFS, uctxt->ctxt, + fd->subctxt, + uctxt->sc->base_addr); + binfo.pio_bufbase_sop = HFI1_MMAP_TOKEN(PIO_BUFS_SOP, + uctxt->ctxt, + fd->subctxt, + uctxt->sc->base_addr); + binfo.rcvhdr_bufbase = HFI1_MMAP_TOKEN(RCV_HDRQ, uctxt->ctxt, + fd->subctxt, + uctxt->rcvhdrq); + binfo.rcvegr_bufbase = HFI1_MMAP_TOKEN(RCV_EGRBUF, uctxt->ctxt, + fd->subctxt, + uctxt->egrbufs.rcvtids[0].phys); + binfo.sdma_comp_bufbase = HFI1_MMAP_TOKEN(SDMA_COMP, uctxt->ctxt, + 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_user_ctxt) * + HFI1_MAX_SHARED_CTXTS) + fd->subctxt) * + sizeof(*dd->events)); + binfo.events_bufbase = HFI1_MMAP_TOKEN(EVENTS, uctxt->ctxt, + fd->subctxt, + offset); + binfo.status_bufbase = HFI1_MMAP_TOKEN(STATUS, uctxt->ctxt, + fd->subctxt, + dd->status); + if (HFI1_CAP_IS_USET(DMA_RTAIL)) + binfo.rcvhdrtail_base = HFI1_MMAP_TOKEN(RTAIL, uctxt->ctxt, + 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_rcvegrbuf = HFI1_MMAP_TOKEN(SUBCTXT_EGRBUF, + uctxt->ctxt, + fd->subctxt, 0); + } + sz = (len < sizeof(binfo)) ? len : sizeof(binfo); + if (copy_to_user(ubase, &binfo, sz)) + ret = -EFAULT; + return ret; +} + +static unsigned int poll_urgent(struct file *fp, + struct poll_table_struct *pt) +{ + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + struct hfi1_devdata *dd = uctxt->dd; + unsigned pollflag; + + poll_wait(fp, &uctxt->wait, pt); + + spin_lock_irq(&dd->uctxt_lock); + if (uctxt->urgent != uctxt->urgent_poll) { + pollflag = POLLIN | POLLRDNORM; + uctxt->urgent_poll = uctxt->urgent; + } else { + pollflag = 0; + set_bit(HFI1_CTXT_WAITING_URG, &uctxt->event_flags); + } + spin_unlock_irq(&dd->uctxt_lock); + + return pollflag; +} + +static unsigned int poll_next(struct file *fp, + struct poll_table_struct *pt) +{ + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + struct hfi1_devdata *dd = uctxt->dd; + unsigned pollflag; + + poll_wait(fp, &uctxt->wait, pt); + + spin_lock_irq(&dd->uctxt_lock); + if (hdrqempty(uctxt)) { + set_bit(HFI1_CTXT_WAITING_RCV, &uctxt->event_flags); + hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_ENB, uctxt->ctxt); + pollflag = 0; + } else { + pollflag = POLLIN | POLLRDNORM; + } + spin_unlock_irq(&dd->uctxt_lock); + + return pollflag; +} + +/* + * Find all user contexts in use, and set the specified bit in their + * event mask. + * See also find_ctxt() for a similar use, that is specific to send buffers. + */ +int hfi1_set_uevent_bits(struct hfi1_pportdata *ppd, const int evtbit) +{ + struct hfi1_ctxtdata *uctxt; + struct hfi1_devdata *dd = ppd->dd; + unsigned ctxt; + int ret = 0; + unsigned long flags; + + if (!dd->events) { + ret = -EINVAL; + goto done; + } + + spin_lock_irqsave(&dd->uctxt_lock, flags); + for (ctxt = dd->first_user_ctxt; ctxt < dd->num_rcv_contexts; + ctxt++) { + uctxt = dd->rcd[ctxt]; + if (uctxt) { + unsigned long *evs = dd->events + + (uctxt->ctxt - dd->first_user_ctxt) * + HFI1_MAX_SHARED_CTXTS; + int i; + /* + * subctxt_cnt is 0 if not shared, so do base + * separately, first, then remaining subctxt, if any + */ + set_bit(evtbit, evs); + for (i = 1; i < uctxt->subctxt_cnt; i++) + set_bit(evtbit, evs + i); + } + } + spin_unlock_irqrestore(&dd->uctxt_lock, flags); +done: + return ret; +} + +/** + * manage_rcvq - manage a context's receive queue + * @uctxt: the context + * @subctxt: the sub-context + * @start_stop: action to carry out + * + * start_stop == 0 disables receive on the context, for use in queue + * overflow conditions. start_stop==1 re-enables, to be used to + * re-init the software copy of the head register + */ +static int manage_rcvq(struct hfi1_ctxtdata *uctxt, unsigned subctxt, + int start_stop) +{ + struct hfi1_devdata *dd = uctxt->dd; + unsigned int rcvctrl_op; + + if (subctxt) + goto bail; + /* atomically clear receive enable ctxt. */ + if (start_stop) { + /* + * On enable, force in-memory copy of the tail register to + * 0, so that protocol code doesn't have to worry about + * whether or not the chip has yet updated the in-memory + * copy or not on return from the system call. The chip + * always resets it's tail register back to 0 on a + * transition from disabled to enabled. + */ + if (uctxt->rcvhdrtail_kvaddr) + clear_rcvhdrtail(uctxt); + rcvctrl_op = HFI1_RCVCTRL_CTXT_ENB; + } else { + rcvctrl_op = HFI1_RCVCTRL_CTXT_DIS; + } + hfi1_rcvctrl(dd, rcvctrl_op, uctxt->ctxt); + /* always; new head should be equal to new tail; see above */ +bail: + return 0; +} + +/* + * clear the event notifier events for this context. + * User process then performs actions appropriate to bit having been + * set, if desired, and checks again in future. + */ +static int user_event_ack(struct hfi1_ctxtdata *uctxt, int subctxt, + unsigned long events) +{ + int i; + struct hfi1_devdata *dd = uctxt->dd; + unsigned long *evs; + + if (!dd->events) + return 0; + + evs = dd->events + ((uctxt->ctxt - dd->first_user_ctxt) * + HFI1_MAX_SHARED_CTXTS) + subctxt; + + for (i = 0; i <= _HFI1_MAX_EVENT_BIT; i++) { + if (!test_bit(i, &events)) + continue; + clear_bit(i, evs); + } + return 0; +} + +static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned subctxt, + u16 pkey) +{ + int ret = -ENOENT, i, intable = 0; + struct hfi1_pportdata *ppd = uctxt->ppd; + struct hfi1_devdata *dd = uctxt->dd; + + if (pkey == LIM_MGMT_P_KEY || pkey == FULL_MGMT_P_KEY) { + ret = -EINVAL; + goto done; + } + + for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) + if (pkey == ppd->pkeys[i]) { + intable = 1; + break; + } + + if (intable) + ret = hfi1_set_ctxt_pkey(dd, uctxt->ctxt, pkey); +done: + return ret; +} + +static void user_remove(struct hfi1_devdata *dd) +{ + + hfi1_cdev_cleanup(&dd->user_cdev, &dd->user_device); +} + +static int user_add(struct hfi1_devdata *dd) +{ + char name[10]; + int ret; + + snprintf(name, sizeof(name), "%s_%d", class_name(), dd->unit); + ret = hfi1_cdev_init(dd->unit, name, &hfi1_file_ops, + &dd->user_cdev, &dd->user_device, + true, &dd->kobj); + if (ret) + user_remove(dd); + + return ret; +} + +/* + * Create per-unit files in /dev + */ +int hfi1_device_create(struct hfi1_devdata *dd) +{ + return user_add(dd); +} + +/* + * Remove per-unit files in /dev + * void, core kernel returns no errors for this stuff + */ +void hfi1_device_remove(struct hfi1_devdata *dd) +{ + user_remove(dd); +} |
