diff options
Diffstat (limited to 'drivers/infiniband/hw/hfi1/file_ops.c')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/file_ops.c | 1683 |
1 files changed, 1683 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 000000000..7c5d487ec --- /dev/null +++ b/drivers/infiniband/hw/hfi1/file_ops.c @@ -0,0 +1,1683 @@ +// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause +/* + * Copyright(c) 2020 Cornelis Networks, Inc. + * Copyright(c) 2015-2020 Intel Corporation. + */ + +#include <linux/poll.h> +#include <linux/cdev.h> +#include <linux/vmalloc.h> +#include <linux/io.h> +#include <linux/sched/mm.h> +#include <linux/bitmap.h> + +#include <rdma/ib.h> + +#include "hfi.h" +#include "pio.h" +#include "device.h" +#include "common.h" +#include "trace.h" +#include "mmu_rb.h" +#include "user_sdma.h" +#include "user_exp_rcv.h" +#include "aspm.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 *inode, struct file *fp); +static int hfi1_file_close(struct inode *inode, struct file *fp); +static ssize_t hfi1_write_iter(struct kiocb *kiocb, struct iov_iter *from); +static __poll_t 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, 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, 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); + +static int find_sub_ctxt(struct hfi1_filedata *fd, + const struct hfi1_user_info *uinfo); +static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd, + struct hfi1_user_info *uinfo, + struct hfi1_ctxtdata **cd); +static void deallocate_ctxt(struct hfi1_ctxtdata *uctxt); +static __poll_t poll_urgent(struct file *fp, struct poll_table_struct *pt); +static __poll_t poll_next(struct file *fp, struct poll_table_struct *pt); +static int user_event_ack(struct hfi1_ctxtdata *uctxt, u16 subctxt, + 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, + unsigned long arg); +static vm_fault_t vma_fault(struct vm_fault *vmf); +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 const 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_filedata *fd; + struct hfi1_devdata *dd = container_of(inode->i_cdev, + struct hfi1_devdata, + user_cdev); + + if (!((dd->flags & HFI1_PRESENT) && dd->kregbase1)) + return -EINVAL; + + if (!refcount_inc_not_zero(&dd->user_refcount)) + return -ENXIO; + + /* The real work is performed later in assign_ctxt() */ + + fd = kzalloc(sizeof(*fd), GFP_KERNEL); + + if (!fd || init_srcu_struct(&fd->pq_srcu)) + goto nomem; + spin_lock_init(&fd->pq_rcu_lock); + spin_lock_init(&fd->tid_lock); + spin_lock_init(&fd->invalid_lock); + fd->rec_cpu_num = -1; /* no cpu affinity by default */ + fd->dd = dd; + fp->private_data = fd; + return 0; +nomem: + kfree(fd); + fp->private_data = NULL; + if (refcount_dec_and_test(&dd->user_refcount)) + complete(&dd->user_comp); + return -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; + int ret = 0; + int uval = 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: + ret = assign_ctxt(fd, arg, _IOC_SIZE(cmd)); + break; + + case HFI1_IOCTL_CTXT_INFO: + ret = get_ctxt_info(fd, arg, _IOC_SIZE(cmd)); + break; + + case HFI1_IOCTL_USER_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: + ret = user_exp_rcv_setup(fd, arg, _IOC_SIZE(cmd)); + break; + + case HFI1_IOCTL_TID_FREE: + ret = user_exp_rcv_clear(fd, arg, _IOC_SIZE(cmd)); + break; + + case HFI1_IOCTL_TID_INVAL_READ: + ret = user_exp_rcv_invalid(fd, arg, _IOC_SIZE(cmd)); + break; + + case HFI1_IOCTL_RECV_CTRL: + ret = manage_rcvq(uctxt, fd->subctxt, arg); + break; + + case HFI1_IOCTL_POLL_TYPE: + if (get_user(uval, (int __user *)arg)) + return -EFAULT; + uctxt->poll_type = (typeof(uctxt->poll_type))uval; + break; + + case HFI1_IOCTL_ACK_EVENT: + ret = user_event_ack(uctxt, fd->subctxt, arg); + break; + + case HFI1_IOCTL_SET_PKEY: + ret = set_ctxt_pkey(uctxt, arg); + break; + + case HFI1_IOCTL_CTXT_RESET: + ret = ctxt_reset(uctxt); + 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; + struct hfi1_user_sdma_comp_q *cq = fd->cq; + int done = 0, reqs = 0; + unsigned long dim = from->nr_segs; + int idx; + + if (!HFI1_CAP_IS_KSET(SDMA)) + return -EINVAL; + idx = srcu_read_lock(&fd->pq_srcu); + pq = srcu_dereference(fd->pq, &fd->pq_srcu); + if (!cq || !pq) { + srcu_read_unlock(&fd->pq_srcu, idx); + return -EIO; + } + + if (!iter_is_iovec(from) || !dim) { + srcu_read_unlock(&fd->pq_srcu, idx); + return -EINVAL; + } + + trace_hfi1_sdma_request(fd->dd, fd->uctxt->ctxt, fd->subctxt, dim); + + if (atomic_read(&pq->n_reqs) == pq->n_max_reqs) { + srcu_read_unlock(&fd->pq_srcu, idx); + return -ENOSPC; + } + + while (dim) { + int ret; + unsigned long count = 0; + + ret = hfi1_user_sdma_process_request( + fd, (struct iovec *)(from->iov + done), + dim, &count); + if (ret) { + reqs = ret; + break; + } + dim -= count; + done += count; + reqs++; + } + + srcu_read_unlock(&fd->pq_srcu, idx); + return 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; + u64 token = vma->vm_pgoff << PAGE_SHIFT, + memaddr = 0; + void *memvirt = NULL; + 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). + */ + memvirt = dd->cr_base[uctxt->numa_id].va; + memaddr = virt_to_phys(memvirt) + + (((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: + memlen = rcvhdrq_size(uctxt); + memvirt = uctxt->rcvhdrq; + 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++) { + memlen = uctxt->egrbufs.buffers[i].len; + memvirt = uctxt->egrbufs.buffers[i].addr; + ret = remap_pfn_range( + vma, addr, + /* + * virt_to_pfn() does the same, but + * it's not available on x86_64 + * when CONFIG_MMU is enabled. + */ + PFN_DOWN(__pa(memvirt)), + memlen, + vma->vm_page_prot); + if (ret < 0) + goto done; + addr += memlen; + } + 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_offset(uctxt)) & 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: + if (flags & VM_WRITE) { + ret = -EPERM; + goto done; + } + 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) || !hfi1_rcvhdrtail_kvaddr(uctxt)) { + ret = -EPERM; + goto done; + } + memlen = PAGE_SIZE; + memvirt = (void *)hfi1_rcvhdrtail_kvaddr(uctxt); + 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 = rcvhdrq_size(uctxt) * 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); + if (vmf) { + vma->vm_pgoff = PFN_DOWN(memaddr); + vma->vm_ops = &vm_ops; + ret = 0; + } else if (mapio) { + ret = io_remap_pfn_range(vma, vma->vm_start, + PFN_DOWN(memaddr), + memlen, + vma->vm_page_prot); + } else if (memvirt) { + ret = remap_pfn_range(vma, vma->vm_start, + PFN_DOWN(__pa(memvirt)), + memlen, + vma->vm_page_prot); + } else { + ret = remap_pfn_range(vma, vma->vm_start, + PFN_DOWN(memaddr), + 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 vm_fault_t vma_fault(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 __poll_t hfi1_poll(struct file *fp, struct poll_table_struct *pt) +{ + struct hfi1_ctxtdata *uctxt; + __poll_t pollflag; + + uctxt = ((struct hfi1_filedata *)fp->private_data)->uctxt; + if (!uctxt) + pollflag = EPOLLERR; + 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 = EPOLLERR; + + 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, "closing ctxt %u:%u", uctxt->ctxt, fdata->subctxt); + + flush_wc(); + /* drain user sdma queue */ + hfi1_user_sdma_free_queues(fdata, uctxt); + + /* release the cpu */ + hfi1_put_proc_affinity(fdata->rec_cpu_num); + + /* clean up rcv side */ + hfi1_user_exp_rcv_free(fdata); + + /* + * fdata->uctxt is used in the above cleanup. It is not ready to be + * removed until here. + */ + fdata->uctxt = NULL; + hfi1_rcd_put(uctxt); + + /* + * Clear any left over, unhandled events so the next process that + * gets this context doesn't get confused. + */ + ev = dd->events + uctxt_offset(uctxt) + fdata->subctxt; + *ev = 0; + + spin_lock_irqsave(&dd->uctxt_lock, flags); + __clear_bit(fdata->subctxt, uctxt->in_use_ctxts); + if (!bitmap_empty(uctxt->in_use_ctxts, HFI1_MAX_SHARED_CTXTS)) { + spin_unlock_irqrestore(&dd->uctxt_lock, flags); + goto done; + } + spin_unlock_irqrestore(&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 | + HFI1_RCVCTRL_URGENT_DIS, uctxt); + /* Clear the context's J_KEY */ + hfi1_clear_ctxt_jkey(dd, uctxt); + /* + * If a send context is allocated, reset context integrity + * checks to default and disable the send context. + */ + if (uctxt->sc) { + sc_disable(uctxt->sc); + set_pio_integrity(uctxt->sc); + } + + hfi1_free_ctxt_rcv_groups(uctxt); + hfi1_clear_ctxt_pkey(dd, uctxt); + + uctxt->event_flags = 0; + + deallocate_ctxt(uctxt); +done: + + if (refcount_dec_and_test(&dd->user_refcount)) + complete(&dd->user_comp); + + cleanup_srcu_struct(&fdata->pq_srcu); + 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; +} + +/** + * complete_subctxt - complete sub-context info + * @fd: valid filedata pointer + * + * Sub-context info can only be set up after the base context + * has been completed. This is indicated by the clearing of the + * HFI1_CTXT_BASE_UINIT bit. + * + * Wait for the bit to be cleared, and then complete the subcontext + * initialization. + * + */ +static int complete_subctxt(struct hfi1_filedata *fd) +{ + int ret; + unsigned long flags; + + /* + * sub-context info can only be set up after the base context + * has been completed. + */ + ret = wait_event_interruptible( + fd->uctxt->wait, + !test_bit(HFI1_CTXT_BASE_UNINIT, &fd->uctxt->event_flags)); + + if (test_bit(HFI1_CTXT_BASE_FAILED, &fd->uctxt->event_flags)) + ret = -ENOMEM; + + /* Finish the sub-context init */ + if (!ret) { + fd->rec_cpu_num = hfi1_get_proc_affinity(fd->uctxt->numa_id); + ret = init_user_ctxt(fd, fd->uctxt); + } + + if (ret) { + spin_lock_irqsave(&fd->dd->uctxt_lock, flags); + __clear_bit(fd->subctxt, fd->uctxt->in_use_ctxts); + spin_unlock_irqrestore(&fd->dd->uctxt_lock, flags); + hfi1_rcd_put(fd->uctxt); + fd->uctxt = NULL; + } + + return ret; +} + +static int assign_ctxt(struct hfi1_filedata *fd, unsigned long arg, u32 len) +{ + int ret; + unsigned int swmajor; + struct hfi1_ctxtdata *uctxt = NULL; + struct hfi1_user_info uinfo; + + if (fd->uctxt) + return -EINVAL; + + if (sizeof(uinfo) != len) + return -EINVAL; + + 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) + return -EINVAL; + + /* + * Acquire the mutex to protect against multiple creations of what + * could be a shared base context. + */ + mutex_lock(&hfi1_mutex); + /* + * 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); + + /* + * 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); + + mutex_unlock(&hfi1_mutex); + + /* Depending on the context type, finish the appropriate init */ + switch (ret) { + case 0: + ret = setup_base_ctxt(fd, uctxt); + if (ret) + deallocate_ctxt(uctxt); + break; + case 1: + ret = complete_subctxt(fd); + break; + default: + break; + } + + return ret; +} + +/** + * match_ctxt - match context + * @fd: valid filedata pointer + * @uinfo: user info to compare base context with + * @uctxt: context to compare uinfo to. + * + * Compare the given context with the given information to see if it + * can be used for a sub context. + */ +static int match_ctxt(struct hfi1_filedata *fd, + const struct hfi1_user_info *uinfo, + struct hfi1_ctxtdata *uctxt) +{ + struct hfi1_devdata *dd = fd->dd; + unsigned long flags; + u16 subctxt; + + /* Skip dynamically allocated kernel contexts */ + if (uctxt->sc && (uctxt->sc->type == SC_KERNEL)) + return 0; + + /* 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) + return 0; + + /* Verify the sharing process matches the base */ + if (uctxt->userversion != uinfo->userversion) + return -EINVAL; + + /* Find an unused sub context */ + spin_lock_irqsave(&dd->uctxt_lock, flags); + if (bitmap_empty(uctxt->in_use_ctxts, HFI1_MAX_SHARED_CTXTS)) { + /* context is being closed, do not use */ + spin_unlock_irqrestore(&dd->uctxt_lock, flags); + return 0; + } + + subctxt = find_first_zero_bit(uctxt->in_use_ctxts, + HFI1_MAX_SHARED_CTXTS); + if (subctxt >= uctxt->subctxt_cnt) { + spin_unlock_irqrestore(&dd->uctxt_lock, flags); + return -EBUSY; + } + + fd->subctxt = subctxt; + __set_bit(fd->subctxt, uctxt->in_use_ctxts); + spin_unlock_irqrestore(&dd->uctxt_lock, flags); + + fd->uctxt = uctxt; + hfi1_rcd_get(uctxt); + + return 1; +} + +/** + * find_sub_ctxt - fund sub-context + * @fd: valid filedata pointer + * @uinfo: matching info to use to find a possible context to share. + * + * The hfi1_mutex must be held when this function is called. It is + * necessary to ensure serialized creation of shared contexts. + * + * Return: + * 0 No sub-context found + * 1 Subcontext found and allocated + * errno EINVAL (incorrect parameters) + * EBUSY (all sub contexts in use) + */ +static int find_sub_ctxt(struct hfi1_filedata *fd, + const struct hfi1_user_info *uinfo) +{ + struct hfi1_ctxtdata *uctxt; + struct hfi1_devdata *dd = fd->dd; + u16 i; + int ret; + + if (!uinfo->subctxt_cnt) + return 0; + + for (i = dd->first_dyn_alloc_ctxt; i < dd->num_rcv_contexts; i++) { + uctxt = hfi1_rcd_get_by_index(dd, i); + if (uctxt) { + ret = match_ctxt(fd, uinfo, uctxt); + hfi1_rcd_put(uctxt); + /* value of != 0 will return */ + if (ret) + return ret; + } + } + + return 0; +} + +static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd, + struct hfi1_user_info *uinfo, + struct hfi1_ctxtdata **rcd) +{ + struct hfi1_ctxtdata *uctxt; + 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; + } + + if (!dd->freectxts) + return -EBUSY; + + /* + * If we don't have a NUMA node requested, preference is towards + * device NUMA node. + */ + fd->rec_cpu_num = hfi1_get_proc_affinity(dd->node); + if (fd->rec_cpu_num != -1) + numa = cpu_to_node(fd->rec_cpu_num); + else + numa = numa_node_id(); + ret = hfi1_create_ctxtdata(dd->pport, numa, &uctxt); + if (ret < 0) { + dd_dev_err(dd, "user ctxtdata allocation failed\n"); + return ret; + } + 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, dd->node); + if (!uctxt->sc) { + ret = -ENOMEM; + goto ctxdata_free; + } + hfi1_cdbg(PROC, "allocated send context %u(%u)\n", uctxt->sc->sw_index, + uctxt->sc->hw_context); + ret = sc_enable(uctxt->sc); + if (ret) + goto ctxdata_free; + + /* + * Setup sub context information if the user-level has requested + * sub contexts. + * This has to be done here so the rest of the sub-contexts find the + * proper base context. + * NOTE: _set_bit() can be used here because the context creation is + * protected by the mutex (rather than the spin_lock), and will be the + * very first instance of this context. + */ + __set_bit(0, uctxt->in_use_ctxts); + if (uinfo->subctxt_cnt) + init_subctxts(uctxt, uinfo); + uctxt->userversion = uinfo->userversion; + uctxt->flags = hfi1_cap_mask; /* save current flag state */ + init_waitqueue_head(&uctxt->wait); + strscpy(uctxt->comm, current->comm, sizeof(uctxt->comm)); + memcpy(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid)); + uctxt->jkey = generate_jkey(current_uid()); + 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); + + *rcd = uctxt; + + return 0; + +ctxdata_free: + hfi1_free_ctxt(uctxt); + return ret; +} + +static void deallocate_ctxt(struct hfi1_ctxtdata *uctxt) +{ + mutex_lock(&hfi1_mutex); + hfi1_stats.sps_ctxts--; + if (++uctxt->dd->freectxts == uctxt->dd->num_user_contexts) + aspm_enable_all(uctxt->dd); + mutex_unlock(&hfi1_mutex); + + hfi1_free_ctxt(uctxt); +} + +static void init_subctxts(struct hfi1_ctxtdata *uctxt, + const struct hfi1_user_info *uinfo) +{ + uctxt->subctxt_cnt = uinfo->subctxt_cnt; + uctxt->subctxt_id = uinfo->subctxt_id; + set_bit(HFI1_CTXT_BASE_UNINIT, &uctxt->event_flags); +} + +static int setup_subctxt(struct hfi1_ctxtdata *uctxt) +{ + int ret = 0; + u16 num_subctxts = uctxt->subctxt_cnt; + + uctxt->subctxt_uregbase = vmalloc_user(PAGE_SIZE); + if (!uctxt->subctxt_uregbase) + return -ENOMEM; + + /* We can take the size of the RcvHdr Queue from the master */ + uctxt->subctxt_rcvhdr_base = vmalloc_user(rcvhdrq_size(uctxt) * + 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; + } + + return 0; + +bail_rhdr: + vfree(uctxt->subctxt_rcvhdr_base); + uctxt->subctxt_rcvhdr_base = NULL; +bail_ureg: + vfree(uctxt->subctxt_uregbase); + uctxt->subctxt_uregbase = NULL; + + return ret; +} + +static void user_init(struct hfi1_ctxtdata *uctxt) +{ + unsigned int rcvctrl_ops = 0; + + /* 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 (hfi1_rcvhdrtail_kvaddr(uctxt)) + clear_rcvhdrtail(uctxt); + + /* Setup J_KEY before enabling the context */ + hfi1_set_ctxt_jkey(uctxt->dd, uctxt, uctxt->jkey); + + rcvctrl_ops = HFI1_RCVCTRL_CTXT_ENB; + rcvctrl_ops |= HFI1_RCVCTRL_URGENT_ENB; + if (HFI1_CAP_UGET_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_UGET_MASK(uctxt->flags, MULTI_PKT_EGR)) + rcvctrl_ops |= HFI1_RCVCTRL_ONE_PKT_EGR_ENB; + if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_EGR_FULL)) + rcvctrl_ops |= HFI1_RCVCTRL_NO_EGR_DROP_ENB; + if (HFI1_CAP_UGET_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_UGET_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); +} + +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; + + if (sizeof(cinfo) != len) + return -EINVAL; + + memset(&cinfo, 0, sizeof(cinfo)); + cinfo.runtime_flags = (((uctxt->flags >> HFI1_CAP_MISC_SHIFT) & + HFI1_CAP_MISC_MASK) << HFI1_CAP_USER_SHIFT) | + HFI1_CAP_UGET_MASK(uctxt->flags, MASK) | + HFI1_CAP_KGET_MASK(uctxt->flags, K2U); + /* adjust flag if this fd is not able to cache */ + if (!fd->use_mn) + cinfo.runtime_flags |= HFI1_CAP_TID_UNMAP; /* no caching */ + + 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 = get_hdrq_cnt(uctxt); + cinfo.rcvhdrq_entsize = get_hdrqentsize(uctxt) << 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((void __user *)arg, &cinfo, len)) + return -EFAULT; + + return 0; +} + +static int init_user_ctxt(struct hfi1_filedata *fd, + struct hfi1_ctxtdata *uctxt) +{ + int ret; + + ret = hfi1_user_sdma_alloc_queues(uctxt, fd); + if (ret) + return ret; + + ret = hfi1_user_exp_rcv_init(fd, uctxt); + if (ret) + hfi1_user_sdma_free_queues(fd, uctxt); + + return ret; +} + +static int setup_base_ctxt(struct hfi1_filedata *fd, + struct hfi1_ctxtdata *uctxt) +{ + struct hfi1_devdata *dd = uctxt->dd; + int ret = 0; + + hfi1_init_ctxt(uctxt->sc); + + /* 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 sub-contexts are enabled, do the appropriate setup */ + if (uctxt->subctxt_cnt) + ret = setup_subctxt(uctxt); + if (ret) + goto done; + + ret = hfi1_alloc_ctxt_rcv_groups(uctxt); + if (ret) + goto done; + + ret = init_user_ctxt(fd, uctxt); + if (ret) { + hfi1_free_ctxt_rcv_groups(uctxt); + goto done; + } + + user_init(uctxt); + + /* Now that the context is set up, the fd can get a reference. */ + fd->uctxt = uctxt; + hfi1_rcd_get(uctxt); + +done: + if (uctxt->subctxt_cnt) { + /* + * On error, set the failed bit so sub-contexts will clean up + * correctly. + */ + if (ret) + set_bit(HFI1_CTXT_BASE_FAILED, &uctxt->event_flags); + + /* + * Base context is done (successfully or not), notify anybody + * using a sub-context that is waiting for this completion. + */ + clear_bit(HFI1_CTXT_BASE_UNINIT, &uctxt->event_flags); + wake_up(&uctxt->wait); + } + + return ret; +} + +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; + unsigned offset; + + 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_USER_SWVERSION; + binfo.bthqp = RVT_KDETH_QP_PREFIX; + 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].dma); + 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_offset(uctxt) + 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); + } + + 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))) + ret = -EFAULT; + + addr = arg + offsetof(struct hfi1_tid_info, length); + if (!ret && copy_to_user((void __user *)addr, &tinfo.length, + sizeof(tinfo.length))) + ret = -EFAULT; + + if (ret) + hfi1_user_exp_rcv_invalid(fd, &tinfo); + } + + 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; +} + +static __poll_t 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; + __poll_t pollflag; + + poll_wait(fp, &uctxt->wait, pt); + + spin_lock_irq(&dd->uctxt_lock); + if (uctxt->urgent != uctxt->urgent_poll) { + pollflag = EPOLLIN | EPOLLRDNORM; + 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 __poll_t 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; + __poll_t 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); + pollflag = 0; + } else { + pollflag = EPOLLIN | EPOLLRDNORM; + } + 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; + u16 ctxt; + + if (!dd->events) + return -EINVAL; + + for (ctxt = dd->first_dyn_alloc_ctxt; ctxt < dd->num_rcv_contexts; + ctxt++) { + uctxt = hfi1_rcd_get_by_index(dd, ctxt); + if (uctxt) { + 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); + hfi1_rcd_put(uctxt); + } + } + + return 0; +} + +/** + * manage_rcvq - manage a context's receive queue + * @uctxt: the context + * @subctxt: the sub-context + * @arg: 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, u16 subctxt, + unsigned long arg) +{ + struct hfi1_devdata *dd = uctxt->dd; + unsigned int rcvctrl_op; + int start_stop; + + if (subctxt) + return 0; + + if (get_user(start_stop, (int __user *)arg)) + return -EFAULT; + + /* 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 (hfi1_rcvhdrtail_kvaddr(uctxt)) + clear_rcvhdrtail(uctxt); + rcvctrl_op = HFI1_RCVCTRL_CTXT_ENB; + } else { + rcvctrl_op = HFI1_RCVCTRL_CTXT_DIS; + } + hfi1_rcvctrl(dd, rcvctrl_op, uctxt); + /* always; new head should be equal to new tail; see above */ + + 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, u16 subctxt, + unsigned long arg) +{ + int i; + struct hfi1_devdata *dd = uctxt->dd; + unsigned long *evs; + unsigned long events; + + if (!dd->events) + return 0; + + 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)) + continue; + clear_bit(i, evs); + } + return 0; +} + +static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned long arg) +{ + int i; + struct hfi1_pportdata *ppd = uctxt->ppd; + struct hfi1_devdata *dd = uctxt->dd; + u16 pkey; + + 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]) + 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); + + 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->verbs_dev.rdi.ibdev.dev.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); +} |