diff options
Diffstat (limited to 'drivers/staging/rdma/hfi1/file_ops.c')
-rw-r--r-- | drivers/staging/rdma/hfi1/file_ops.c | 1773 |
1 files changed, 0 insertions, 1773 deletions
diff --git a/drivers/staging/rdma/hfi1/file_ops.c b/drivers/staging/rdma/hfi1/file_ops.c deleted file mode 100644 index c1c5bf82a..000000000 --- a/drivers/staging/rdma/hfi1/file_ops.c +++ /dev/null @@ -1,1773 +0,0 @@ -/* - * 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_file_write(struct file *, const char __user *, - size_t, loff_t *); -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, unsigned); -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 const struct file_operations hfi1_file_ops = { - .owner = THIS_MODULE, - .write = hfi1_file_write, - .write_iter = hfi1_write_iter, - .open = hfi1_file_open, - .release = hfi1_file_close, - .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) -{ - /* 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 ssize_t hfi1_file_write(struct file *fp, const char __user *data, - size_t count, loff_t *offset) -{ - const struct hfi1_cmd __user *ucmd; - struct hfi1_filedata *fd = fp->private_data; - struct hfi1_ctxtdata *uctxt = fd->uctxt; - struct hfi1_cmd cmd; - struct hfi1_user_info uinfo; - struct hfi1_tid_info tinfo; - unsigned long addr; - ssize_t consumed = 0, copy = 0, ret = 0; - void *dest = NULL; - __u64 user_val = 0; - int uctxt_required = 1; - int must_be_root = 0; - - /* FIXME: This interface cannot continue out of staging */ - if (WARN_ON_ONCE(!ib_safe_file_access(fp))) - return -EACCES; - - if (count < sizeof(cmd)) { - ret = -EINVAL; - goto bail; - } - - ucmd = (const struct hfi1_cmd __user *)data; - if (copy_from_user(&cmd, ucmd, sizeof(cmd))) { - ret = -EFAULT; - goto bail; - } - - consumed = sizeof(cmd); - - switch (cmd.type) { - case HFI1_CMD_ASSIGN_CTXT: - uctxt_required = 0; /* assigned user context not required */ - copy = sizeof(uinfo); - dest = &uinfo; - break; - case HFI1_CMD_SDMA_STATUS_UPD: - case HFI1_CMD_CREDIT_UPD: - copy = 0; - break; - case HFI1_CMD_TID_UPDATE: - case HFI1_CMD_TID_FREE: - case HFI1_CMD_TID_INVAL_READ: - copy = sizeof(tinfo); - dest = &tinfo; - break; - case HFI1_CMD_USER_INFO: - case HFI1_CMD_RECV_CTRL: - case HFI1_CMD_POLL_TYPE: - case HFI1_CMD_ACK_EVENT: - case HFI1_CMD_CTXT_INFO: - case HFI1_CMD_SET_PKEY: - case HFI1_CMD_CTXT_RESET: - copy = 0; - user_val = cmd.addr; - break; - case HFI1_CMD_EP_INFO: - case HFI1_CMD_EP_ERASE_CHIP: - case HFI1_CMD_EP_ERASE_RANGE: - case HFI1_CMD_EP_READ_RANGE: - case HFI1_CMD_EP_WRITE_RANGE: - uctxt_required = 0; /* assigned user context not required */ - must_be_root = 1; /* validate user */ - copy = 0; - break; - default: - ret = -EINVAL; - goto bail; - } - - /* If the command comes with user data, copy it. */ - if (copy) { - if (copy_from_user(dest, (void __user *)cmd.addr, copy)) { - ret = -EFAULT; - goto bail; - } - consumed += copy; - } - - /* - * Make sure there is a uctxt when needed. - */ - if (uctxt_required && !uctxt) { - ret = -EINVAL; - goto bail; - } - - /* only root can do these operations */ - if (must_be_root && !capable(CAP_SYS_ADMIN)) { - ret = -EPERM; - goto bail; - } - - switch (cmd.type) { - case HFI1_CMD_ASSIGN_CTXT: - ret = assign_ctxt(fp, &uinfo); - if (ret < 0) - goto bail; - ret = setup_ctxt(fp); - if (ret) - goto bail; - ret = user_init(fp); - break; - case HFI1_CMD_CTXT_INFO: - ret = get_ctxt_info(fp, (void __user *)(unsigned long) - user_val, cmd.len); - break; - case HFI1_CMD_USER_INFO: - ret = get_base_info(fp, (void __user *)(unsigned long) - user_val, cmd.len); - break; - case HFI1_CMD_SDMA_STATUS_UPD: - break; - case HFI1_CMD_CREDIT_UPD: - if (uctxt && uctxt->sc) - sc_return_credits(uctxt->sc); - break; - case HFI1_CMD_TID_UPDATE: - 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 = (unsigned long)cmd.addr + - 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_CMD_TID_INVAL_READ: - ret = hfi1_user_exp_rcv_invalid(fp, &tinfo); - if (ret) - break; - addr = (unsigned long)cmd.addr + - offsetof(struct hfi1_tid_info, tidcnt); - if (copy_to_user((void __user *)addr, &tinfo.tidcnt, - sizeof(tinfo.tidcnt))) - ret = -EFAULT; - break; - case HFI1_CMD_TID_FREE: - ret = hfi1_user_exp_rcv_clear(fp, &tinfo); - if (ret) - break; - addr = (unsigned long)cmd.addr + - offsetof(struct hfi1_tid_info, tidcnt); - if (copy_to_user((void __user *)addr, &tinfo.tidcnt, - sizeof(tinfo.tidcnt))) - ret = -EFAULT; - break; - case HFI1_CMD_RECV_CTRL: - ret = manage_rcvq(uctxt, fd->subctxt, (int)user_val); - break; - case HFI1_CMD_POLL_TYPE: - uctxt->poll_type = (typeof(uctxt->poll_type))user_val; - break; - case HFI1_CMD_ACK_EVENT: - ret = user_event_ack(uctxt, fd->subctxt, user_val); - break; - case HFI1_CMD_SET_PKEY: - if (HFI1_CAP_IS_USET(PKEY_CHECK)) - ret = set_ctxt_pkey(uctxt, fd->subctxt, user_val); - else - ret = -EPERM; - break; - case HFI1_CMD_CTXT_RESET: { - struct send_context *sc; - struct hfi1_devdata *dd; - - if (!uctxt || !uctxt->dd || !uctxt->sc) { - ret = -EINVAL; - break; - } - /* - * 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)) { - ret = -ENOLCK; - break; - } - /* - * 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) { - ret = -ENOLCK; - break; - } - if (dd->flags & HFI1_FORCED_FREEZE) { - /* - * Don't allow context reset if we are into - * forced freeze - */ - ret = -ENODEV; - break; - } - 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_CMD_EP_INFO: - case HFI1_CMD_EP_ERASE_CHIP: - case HFI1_CMD_EP_ERASE_RANGE: - case HFI1_CMD_EP_READ_RANGE: - case HFI1_CMD_EP_WRITE_RANGE: - ret = handle_eprom_command(fp, &cmd); - break; - } - - if (ret >= 0) - ret = consumed; -bail: - 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; - unsigned long flags, *ev; - - fp->private_data = NULL; - - if (!uctxt) - goto done; - - hfi1_cdbg(PROC, "freeing ctxt %u:%u", uctxt->ctxt, fdata->subctxt); - dd = uctxt->dd; - 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: - 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 swmajor, swminor, alg = HFI1_ALG_ACROSS; - - swmajor = uinfo->userversion >> 16; - if (swmajor != HFI1_USER_SWMAJOR) { - ret = -ENODEV; - goto done; - } - - swminor = uinfo->userversion & 0xffff; - - if (uinfo->hfi1_alg < HFI1_ALG_COUNT) - alg = uinfo->hfi1_alg; - - 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 - 1, alg); - } -done_unlock: - mutex_unlock(&hfi1_mutex); -done: - return ret; -} - -/* return true if the device available for general use */ -static int usable_device(struct hfi1_devdata *dd) -{ - struct hfi1_pportdata *ppd = dd->pport; - - return driver_lstate(ppd) == IB_PORT_ACTIVE; -} - -static int get_user_context(struct file *fp, struct hfi1_user_info *uinfo, - int devno, unsigned alg) -{ - struct hfi1_devdata *dd = NULL; - int ret = 0, devmax, npresent, nup, dev; - - devmax = hfi1_count_units(&npresent, &nup); - if (!npresent) { - ret = -ENXIO; - goto done; - } - if (!nup) { - ret = -ENETDOWN; - goto done; - } - if (devno >= 0) { - dd = hfi1_lookup(devno); - if (!dd) - ret = -ENODEV; - else if (!dd->freectxts) - ret = -EBUSY; - } else { - struct hfi1_devdata *pdd; - - if (alg == HFI1_ALG_ACROSS) { - unsigned free = 0U; - - for (dev = 0; dev < devmax; dev++) { - pdd = hfi1_lookup(dev); - if (!pdd) - continue; - if (!usable_device(pdd)) - continue; - if (pdd->freectxts && - pdd->freectxts > free) { - dd = pdd; - free = pdd->freectxts; - } - } - } else { - for (dev = 0; dev < devmax; dev++) { - pdd = hfi1_lookup(dev); - if (!pdd) - continue; - if (!usable_device(pdd)) - continue; - if (pdd->freectxts) { - dd = pdd; - break; - } - } - } - if (!dd) - ret = -EBUSY; - } -done: - return ret ? ret : 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 int ui_open(struct inode *inode, struct file *filp) -{ - struct hfi1_devdata *dd; - - dd = container_of(inode->i_cdev, struct hfi1_devdata, ui_cdev); - filp->private_data = dd; /* for other methods */ - return 0; -} - -static int ui_release(struct inode *inode, struct file *filp) -{ - /* nothing to do */ - return 0; -} - -static loff_t ui_lseek(struct file *filp, loff_t offset, int whence) -{ - struct hfi1_devdata *dd = filp->private_data; - - return fixed_size_llseek(filp, offset, whence, - (dd->kregend - dd->kregbase) + DC8051_DATA_MEM_SIZE); -} - -/* NOTE: assumes unsigned long is 8 bytes */ -static ssize_t ui_read(struct file *filp, char __user *buf, size_t count, - loff_t *f_pos) -{ - struct hfi1_devdata *dd = filp->private_data; - void __iomem *base = dd->kregbase; - unsigned long total, csr_off, - barlen = (dd->kregend - dd->kregbase); - u64 data; - - /* only read 8 byte quantities */ - if ((count % 8) != 0) - return -EINVAL; - /* offset must be 8-byte aligned */ - if ((*f_pos % 8) != 0) - return -EINVAL; - /* destination buffer must be 8-byte aligned */ - if ((unsigned long)buf % 8 != 0) - return -EINVAL; - /* must be in range */ - if (*f_pos + count > (barlen + DC8051_DATA_MEM_SIZE)) - return -EINVAL; - /* only set the base if we are not starting past the BAR */ - if (*f_pos < barlen) - base += *f_pos; - csr_off = *f_pos; - for (total = 0; total < count; total += 8, csr_off += 8) { - /* accessing LCB CSRs requires more checks */ - if (is_lcb_offset(csr_off)) { - if (read_lcb_csr(dd, csr_off, (u64 *)&data)) - break; /* failed */ - } - /* - * Cannot read ASIC GPIO/QSFP* clear and force CSRs without a - * false parity error. Avoid the whole issue by not reading - * them. These registers are defined as having a read value - * of 0. - */ - else if (csr_off == ASIC_GPIO_CLEAR || - csr_off == ASIC_GPIO_FORCE || - csr_off == ASIC_QSFP1_CLEAR || - csr_off == ASIC_QSFP1_FORCE || - csr_off == ASIC_QSFP2_CLEAR || - csr_off == ASIC_QSFP2_FORCE) - data = 0; - else if (csr_off >= barlen) { - /* - * read_8051_data can read more than just 8 bytes at - * a time. However, folding this into the loop and - * handling the reads in 8 byte increments allows us - * to smoothly transition from chip memory to 8051 - * memory. - */ - if (read_8051_data(dd, - (u32)(csr_off - barlen), - sizeof(data), &data)) - break; /* failed */ - } else - data = readq(base + total); - if (put_user(data, (unsigned long __user *)(buf + total))) - break; - } - *f_pos += total; - return total; -} - -/* NOTE: assumes unsigned long is 8 bytes */ -static ssize_t ui_write(struct file *filp, const char __user *buf, - size_t count, loff_t *f_pos) -{ - struct hfi1_devdata *dd = filp->private_data; - void __iomem *base; - unsigned long total, data, csr_off; - int in_lcb; - - /* only write 8 byte quantities */ - if ((count % 8) != 0) - return -EINVAL; - /* offset must be 8-byte aligned */ - if ((*f_pos % 8) != 0) - return -EINVAL; - /* source buffer must be 8-byte aligned */ - if ((unsigned long)buf % 8 != 0) - return -EINVAL; - /* must be in range */ - if (*f_pos + count > dd->kregend - dd->kregbase) - return -EINVAL; - - base = (void __iomem *)dd->kregbase + *f_pos; - csr_off = *f_pos; - in_lcb = 0; - for (total = 0; total < count; total += 8, csr_off += 8) { - if (get_user(data, (unsigned long __user *)(buf + total))) - break; - /* accessing LCB CSRs requires a special procedure */ - if (is_lcb_offset(csr_off)) { - if (!in_lcb) { - int ret = acquire_lcb_access(dd, 1); - - if (ret) - break; - in_lcb = 1; - } - } else { - if (in_lcb) { - release_lcb_access(dd, 1); - in_lcb = 0; - } - } - writeq(data, base + total); - } - if (in_lcb) - release_lcb_access(dd, 1); - *f_pos += total; - return total; -} - -static const struct file_operations ui_file_ops = { - .owner = THIS_MODULE, - .llseek = ui_lseek, - .read = ui_read, - .write = ui_write, - .open = ui_open, - .release = ui_release, -}; - -#define UI_OFFSET 192 /* device minor offset for UI devices */ -static int create_ui = 1; - -static struct cdev wildcard_cdev; -static struct device *wildcard_device; - -static atomic_t user_count = ATOMIC_INIT(0); - -static void user_remove(struct hfi1_devdata *dd) -{ - if (atomic_dec_return(&user_count) == 0) - hfi1_cdev_cleanup(&wildcard_cdev, &wildcard_device); - - hfi1_cdev_cleanup(&dd->user_cdev, &dd->user_device); - hfi1_cdev_cleanup(&dd->ui_cdev, &dd->ui_device); -} - -static int user_add(struct hfi1_devdata *dd) -{ - char name[10]; - int ret; - - if (atomic_inc_return(&user_count) == 1) { - ret = hfi1_cdev_init(0, class_name(), &hfi1_file_ops, - &wildcard_cdev, &wildcard_device, - true); - if (ret) - goto done; - } - - snprintf(name, sizeof(name), "%s_%d", class_name(), dd->unit); - ret = hfi1_cdev_init(dd->unit + 1, name, &hfi1_file_ops, - &dd->user_cdev, &dd->user_device, - true); - if (ret) - goto done; - - if (create_ui) { - snprintf(name, sizeof(name), - "%s_ui%d", class_name(), dd->unit); - ret = hfi1_cdev_init(dd->unit + UI_OFFSET, name, &ui_file_ops, - &dd->ui_cdev, &dd->ui_device, - false); - if (ret) - goto done; - } - - return 0; -done: - user_remove(dd); - return ret; -} - -/* - * Create per-unit files in /dev - */ -int hfi1_device_create(struct hfi1_devdata *dd) -{ - int r, ret; - - r = user_add(dd); - ret = hfi1_diag_add(dd); - if (r && !ret) - ret = r; - return ret; -} - -/* - * 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); - hfi1_diag_remove(dd); -} |