diff options
Diffstat (limited to 'drivers/staging/rdma/hfi1/file_ops.c')
| -rw-r--r-- | drivers/staging/rdma/hfi1/file_ops.c | 2140 |
1 files changed, 2140 insertions, 0 deletions
diff --git a/drivers/staging/rdma/hfi1/file_ops.c b/drivers/staging/rdma/hfi1/file_ops.c new file mode 100644 index 000000000000..469861750b76 --- /dev/null +++ b/drivers/staging/rdma/hfi1/file_ops.c @@ -0,0 +1,2140 @@ +/* + * + * 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 + * + * Copyright(c) 2015 Intel Corporation. + * + * 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 + * + * Copyright(c) 2015 Intel Corporation. + * + * 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/pci.h> +#include <linux/poll.h> +#include <linux/cdev.h> +#include <linux/swap.h> +#include <linux/vmalloc.h> +#include <linux/highmem.h> +#include <linux/io.h> +#include <linux/jiffies.h> +#include <asm/pgtable.h> +#include <linux/delay.h> +#include <linux/export.h> +#include <linux/module.h> +#include <linux/cred.h> +#include <linux/uio.h> + +#include "hfi.h" +#include "pio.h" +#include "device.h" +#include "common.h" +#include "trace.h" +#include "user_sdma.h" +#include "eprom.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 int exp_tid_setup(struct file *, struct hfi1_tid_info *); +static int exp_tid_free(struct file *, struct hfi1_tid_info *); +static void unlock_exp_tids(struct hfi1_ctxtdata *); + +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, ((unsigned long)addr & ~PAGE_MASK))) + +#define EXP_TID_SET(field, value) \ + (((value) & EXP_TID_TID##field##_MASK) << \ + EXP_TID_TID##field##_SHIFT) +#define EXP_TID_CLEAR(tid, field) { \ + (tid) &= ~(EXP_TID_TID##field##_MASK << \ + EXP_TID_TID##field##_SHIFT); \ + } +#define EXP_TID_RESET(tid, field, value) do { \ + EXP_TID_CLEAR(tid, field); \ + (tid) |= EXP_TID_SET(field, value); \ + } while (0) + +#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_ctxtdata *uctxt = ctxt_fp(fp); + struct hfi1_cmd cmd; + struct hfi1_user_info uinfo; + struct hfi1_tid_info tinfo; + ssize_t consumed = 0, copy = 0, ret = 0; + void *dest = NULL; + __u64 user_val = 0; + int uctxt_required = 1; + int must_be_root = 0; + + 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: + 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_P0: + case HFI1_CMD_EP_ERASE_P1: + case HFI1_CMD_EP_READ_P0: + case HFI1_CMD_EP_READ_P1: + case HFI1_CMD_EP_WRITE_P0: + case HFI1_CMD_EP_WRITE_P1: + 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 = exp_tid_setup(fp, &tinfo); + if (!ret) { + unsigned long addr; + /* + * 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_FREE: + ret = exp_tid_free(fp, &tinfo); + break; + case HFI1_CMD_RECV_CTRL: + ret = manage_rcvq(uctxt, subctxt_fp(fp), (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, subctxt_fp(fp), user_val); + break; + case HFI1_CMD_SET_PKEY: + if (HFI1_CAP_IS_USET(PKEY_CHECK)) + ret = set_ctxt_pkey(uctxt, subctxt_fp(fp), 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_P0: + case HFI1_CMD_EP_ERASE_P1: + case HFI1_CMD_EP_READ_P0: + case HFI1_CMD_EP_READ_P1: + case HFI1_CMD_EP_WRITE_P0: + case HFI1_CMD_EP_WRITE_P1: + ret = handle_eprom_command(&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_user_sdma_pkt_q *pq; + struct hfi1_user_sdma_comp_q *cq; + int ret = 0, done = 0, reqs = 0; + unsigned long dim = from->nr_segs; + + if (!user_sdma_comp_fp(kiocb->ki_filp) || + !user_sdma_pkt_fp(kiocb->ki_filp)) { + ret = -EIO; + goto done; + } + + if (!iter_is_iovec(from) || !dim) { + ret = -EINVAL; + goto done; + } + + hfi1_cdbg(SDMA, "SDMA request from %u:%u (%lu)", + ctxt_fp(kiocb->ki_filp)->ctxt, subctxt_fp(kiocb->ki_filp), + dim); + pq = user_sdma_pkt_fp(kiocb->ki_filp); + cq = user_sdma_comp_fp(kiocb->ki_filp); + + 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_ctxtdata *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; + + uctxt = ctxt_fp(fp); + 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 != subctxt_fp(fp)) { + 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 * (1 << 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 = ALIGN(uctxt->sc->credits * PIO_BLOCK_SIZE, + PAGE_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; + + if (!user_sdma_comp_fp(fp)) { + ret = -EFAULT; + goto done; + } + cq = user_sdma_comp_fp(fp); + memaddr = (u64)cq->comps; + memlen = ALIGN(sizeof(*cq->comps) * cq->nentries, PAGE_SIZE); + 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, subctxt_fp(fp), + (vma->vm_end - vma->vm_start), memlen); + ret = -EINVAL; + goto done; + } + + vma->vm_flags = flags; + dd_dev_info(dd, + "%s: %u:%u type:%u io/vf:%d/%d, addr:0x%llx, len:%lu(%lu), flags:0x%lx\n", + __func__, 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 = ctxt_fp(fp); + 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 */ + if (fdata->pq) + hfi1_user_sdma_free_queues(fdata); + + /* + * 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_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; + uctxt->rcvwait_to = 0; + uctxt->piowait_to = 0; + uctxt->rcvnowait = 0; + uctxt->pionowait = 0; + uctxt->event_flags = 0; + + hfi1_clear_tids(uctxt); + hfi1_clear_ctxt_pkey(dd, uctxt->ctxt); + + if (uctxt->tid_pg_list) + unlock_exp_tids(uctxt); + + hfi1_stats.sps_ctxts--; + dd->freectxts++; + 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) + ret = find_shared_ctxt(fp, uinfo); + + /* + * 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); + } + mutex_unlock(&hfi1_mutex); +done: + return ret; +} + +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 && pdd->freectxts && + pdd->freectxts > free) { + dd = pdd; + free = pdd->freectxts; + } + } + } else { + for (dev = 0; dev < devmax; dev++) { + pdd = hfi1_lookup(dev); + if (pdd && 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; + + devmax = hfi1_count_units(NULL, NULL); + + for (ndev = 0; ndev < devmax; ndev++) { + struct hfi1_devdata *dd = hfi1_lookup(ndev); + + /* device portion of usable() */ + 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->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; + } + ctxt_fp(fp) = uctxt; + subctxt_fp(fp) = uctxt->cnt++; + uctxt->subpid[subctxt_fp(fp)] = current->pid; + uctxt->active_slaves |= 1 << subctxt_fp(fp); + 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_ctxtdata *uctxt; + unsigned ctxt; + int ret; + + 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; + + uctxt = hfi1_create_ctxtdata(dd->pport, ctxt); + if (!uctxt) { + dd_dev_err(dd, + "Unable to allocate ctxtdata memory, failing open\n"); + return -ENOMEM; + } + /* + * Allocate and enable a PIO send context. + */ + uctxt->sc = sc_alloc(dd, SC_USER, uctxt->rcvhdrqentsize, + uctxt->numa_id); + if (!uctxt->sc) + return -ENOMEM; + + dbg("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 && !subctxt_fp(fp)) { + 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++; + dd->freectxts--; + ctxt_fp(fp) = uctxt; + + return 0; +} + +static int init_subctxts(struct hfi1_ctxtdata *uctxt, + const struct hfi1_user_info *uinfo) +{ + int ret = 0; + unsigned num_subctxts; + + num_subctxts = uinfo->subctxt_cnt; + if (num_subctxts > HFI1_MAX_SHARED_CTXTS) { + ret = -EINVAL; + goto bail; + } + + 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); +bail: + return ret; +} + +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) +{ + int ret; + unsigned int rcvctrl_ops = 0; + struct hfi1_ctxtdata *uctxt = ctxt_fp(fp); + + /* make sure that the context has already been setup */ + if (!test_bit(HFI1_CTXT_SETUP_DONE, &uctxt->event_flags)) { + ret = -EFAULT; + goto done; + } + + /* + * Subctxts don't need to initialize anything since master + * has done it. + */ + if (subctxt_fp(fp)) { + ret = wait_event_interruptible(uctxt->wait, + !test_bit(HFI1_CTXT_MASTER_UNINIT, + &uctxt->event_flags)); + goto done; + } + + /* 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; + if (HFI1_CAP_KGET_MASK(uctxt->flags, DMA_RTAIL)) + rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_ENB; + 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); + } + ret = 0; + +done: + return ret; +} + +static int get_ctxt_info(struct file *fp, void __user *ubase, __u32 len) +{ + struct hfi1_ctxt_info cinfo; + struct hfi1_ctxtdata *uctxt = ctxt_fp(fp); + struct hfi1_filedata *fd = fp->private_data; + int ret = 0; + + 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 = subctxt_fp(fp); + 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 = user_sdma_comp_fp(fp)->nentries; + cinfo.rcvegr_size = uctxt->egrbufs.rcvtid_size; + + trace_hfi1_ctxt_info(uctxt->dd, uctxt->ctxt, subctxt_fp(fp), cinfo); + if (copy_to_user(ubase, &cinfo, sizeof(cinfo))) + ret = -EFAULT; +done: + return ret; +} + +static int setup_ctxt(struct file *fp) +{ + struct hfi1_ctxtdata *uctxt = ctxt_fp(fp); + 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 || !subctxt_fp(fp)) { + 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 && !subctxt_fp(fp)) { + ret = setup_subctxt(uctxt); + if (ret) + goto done; + } + /* Setup Expected Rcv memories */ + uctxt->tid_pg_list = vzalloc(uctxt->expected_count * + sizeof(struct page **)); + if (!uctxt->tid_pg_list) { + ret = -ENOMEM; + goto done; + } + uctxt->physshadow = vzalloc(uctxt->expected_count * + sizeof(*uctxt->physshadow)); + if (!uctxt->physshadow) { + ret = -ENOMEM; + goto done; + } + /* allocate expected TID map and initialize the cursor */ + atomic_set(&uctxt->tidcursor, 0); + uctxt->numtidgroups = uctxt->expected_count / + dd->rcv_entries.group_size; + uctxt->tidmapcnt = uctxt->numtidgroups / BITS_PER_LONG + + !!(uctxt->numtidgroups % BITS_PER_LONG); + uctxt->tidusemap = kzalloc_node(uctxt->tidmapcnt * + sizeof(*uctxt->tidusemap), + GFP_KERNEL, uctxt->numa_id); + if (!uctxt->tidusemap) { + ret = -ENOMEM; + goto done; + } + /* + * In case that the number of groups is not a multiple of + * 64 (the number of groups in a tidusemap element), mark + * the extra ones as used. This will effectively make them + * permanently used and should never be assigned. Otherwise, + * the code which checks how many free groups we have will + * get completely confused about the state of the bits. + */ + if (uctxt->numtidgroups % BITS_PER_LONG) + uctxt->tidusemap[uctxt->tidmapcnt - 1] = + ~((1ULL << (uctxt->numtidgroups % + BITS_PER_LONG)) - 1); + trace_hfi1_exp_tid_map(uctxt->ctxt, subctxt_fp(fp), 0, + uctxt->tidusemap, uctxt->tidmapcnt); + } + ret = hfi1_user_sdma_alloc_queues(uctxt, 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_ctxtdata *uctxt = ctxt_fp(fp); + 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, + subctxt_fp(fp), offset); + binfo.pio_bufbase = HFI1_MMAP_TOKEN(PIO_BUFS, uctxt->ctxt, + subctxt_fp(fp), + uctxt->sc->base_addr); + binfo.pio_bufbase_sop = HFI1_MMAP_TOKEN(PIO_BUFS_SOP, + uctxt->ctxt, + subctxt_fp(fp), + uctxt->sc->base_addr); + binfo.rcvhdr_bufbase = HFI1_MMAP_TOKEN(RCV_HDRQ, uctxt->ctxt, + subctxt_fp(fp), + uctxt->rcvhdrq); + binfo.rcvegr_bufbase = HFI1_MMAP_TOKEN(RCV_EGRBUF, uctxt->ctxt, + subctxt_fp(fp), + uctxt->egrbufs.rcvtids[0].phys); + binfo.sdma_comp_bufbase = HFI1_MMAP_TOKEN(SDMA_COMP, uctxt->ctxt, + subctxt_fp(fp), 0); + /* + * user regs are at + * (RXE_PER_CONTEXT_USER + (ctxt * RXE_PER_CONTEXT_SIZE)) + */ + binfo.user_regbase = HFI1_MMAP_TOKEN(UREGS, uctxt->ctxt, + subctxt_fp(fp), 0); + offset = ((((uctxt->ctxt - dd->first_user_ctxt) * + HFI1_MAX_SHARED_CTXTS) + subctxt_fp(fp)) * + sizeof(*dd->events)) & ~PAGE_MASK; + binfo.events_bufbase = HFI1_MMAP_TOKEN(EVENTS, uctxt->ctxt, + subctxt_fp(fp), + offset); + binfo.status_bufbase = HFI1_MMAP_TOKEN(STATUS, uctxt->ctxt, + subctxt_fp(fp), + dd->status); + if (HFI1_CAP_IS_USET(DMA_RTAIL)) + binfo.rcvhdrtail_base = HFI1_MMAP_TOKEN(RTAIL, uctxt->ctxt, + subctxt_fp(fp), 0); + if (uctxt->subctxt_cnt) { + binfo.subctxt_uregbase = HFI1_MMAP_TOKEN(SUBCTXT_UREGS, + uctxt->ctxt, + subctxt_fp(fp), 0); + binfo.subctxt_rcvhdrbuf = HFI1_MMAP_TOKEN(SUBCTXT_RCV_HDRQ, + uctxt->ctxt, + subctxt_fp(fp), 0); + binfo.subctxt_rcvegrbuf = HFI1_MMAP_TOKEN(SUBCTXT_EGRBUF, + uctxt->ctxt, + subctxt_fp(fp), 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_ctxtdata *uctxt = ctxt_fp(fp); + 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_ctxtdata *uctxt = ctxt_fp(fp); + 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; +} + +#define num_user_pages(vaddr, len) \ + (1 + (((((unsigned long)(vaddr) + \ + (unsigned long)(len) - 1) & PAGE_MASK) - \ + ((unsigned long)vaddr & PAGE_MASK)) >> PAGE_SHIFT)) + +/** + * tzcnt - count the number of trailing zeros in a 64bit value + * @value: the value to be examined + * + * Returns the number of trailing least significant zeros in the + * the input value. If the value is zero, return the number of + * bits of the value. + */ +static inline u8 tzcnt(u64 value) +{ + return value ? __builtin_ctzl(value) : sizeof(value) * 8; +} + +static inline unsigned num_free_groups(unsigned long map, u16 *start) +{ + unsigned free; + u16 bitidx = *start; + + if (bitidx >= BITS_PER_LONG) + return 0; + /* "Turn off" any bits set before our bit index */ + map &= ~((1ULL << bitidx) - 1); + free = tzcnt(map) - bitidx; + while (!free && bitidx < BITS_PER_LONG) { + /* Zero out the last set bit so we look at the rest */ + map &= ~(1ULL << bitidx); + /* + * Account for the previously checked bits and advance + * the bit index. We don't have to check for bitidx + * getting bigger than BITS_PER_LONG here as it would + * mean extra instructions that we don't need. If it + * did happen, it would push free to a negative value + * which will break the loop. + */ + free = tzcnt(map) - ++bitidx; + } + *start = bitidx; + return free; +} + +static int exp_tid_setup(struct file *fp, struct hfi1_tid_info *tinfo) +{ + int ret = 0; + struct hfi1_ctxtdata *uctxt = ctxt_fp(fp); + struct hfi1_devdata *dd = uctxt->dd; + unsigned tid, mapped = 0, npages, ngroups, exp_groups, + tidpairs = uctxt->expected_count / 2; + struct page **pages; + unsigned long vaddr, tidmap[uctxt->tidmapcnt]; + dma_addr_t *phys; + u32 tidlist[tidpairs], pairidx = 0, tidcursor; + u16 useidx, idx, bitidx, tidcnt = 0; + + vaddr = tinfo->vaddr; + + if (vaddr & ~PAGE_MASK) { + ret = -EINVAL; + goto bail; + } + + npages = num_user_pages(vaddr, tinfo->length); + if (!npages) { + ret = -EINVAL; + goto bail; + } + if (!access_ok(VERIFY_WRITE, (void __user *)vaddr, + npages * PAGE_SIZE)) { + dd_dev_err(dd, "Fail vaddr %p, %u pages, !access_ok\n", + (void *)vaddr, npages); + ret = -EFAULT; + goto bail; + } + + memset(tidmap, 0, sizeof(tidmap[0]) * uctxt->tidmapcnt); + memset(tidlist, 0, sizeof(tidlist[0]) * tidpairs); + + exp_groups = uctxt->expected_count / dd->rcv_entries.group_size; + /* which group set do we look at first? */ + tidcursor = atomic_read(&uctxt->tidcursor); + useidx = (tidcursor >> 16) & 0xffff; + bitidx = tidcursor & 0xffff; + + /* + * Keep going until we've mapped all pages or we've exhausted all + * RcvArray entries. + * This iterates over the number of tidmaps + 1 + * (idx <= uctxt->tidmapcnt) so we check the bitmap which we + * started from one more time for any free bits before the + * starting point bit. + */ + for (mapped = 0, idx = 0; + mapped < npages && idx <= uctxt->tidmapcnt;) { + u64 i, offset = 0; + unsigned free, pinned, pmapped = 0, bits_used; + u16 grp; + + /* + * "Reserve" the needed group bits under lock so other + * processes can't step in the middle of it. Once + * reserved, we don't need the lock anymore since we + * are guaranteed the groups. + */ + spin_lock(&uctxt->exp_lock); + if (uctxt->tidusemap[useidx] == -1ULL || + bitidx >= BITS_PER_LONG) { + /* no free groups in the set, use the next */ + useidx = (useidx + 1) % uctxt->tidmapcnt; + idx++; + bitidx = 0; + spin_unlock(&uctxt->exp_lock); + continue; + } + ngroups = ((npages - mapped) / dd->rcv_entries.group_size) + + !!((npages - mapped) % dd->rcv_entries.group_size); + + /* + * If we've gotten here, the current set of groups does have + * one or more free groups. + */ + free = num_free_groups(uctxt->tidusemap[useidx], &bitidx); + if (!free) { + /* + * Despite the check above, free could still come back + * as 0 because we don't check the entire bitmap but + * we start from bitidx. + */ + spin_unlock(&uctxt->exp_lock); + continue; + } + bits_used = min(free, ngroups); + tidmap[useidx] |= ((1ULL << bits_used) - 1) << bitidx; + uctxt->tidusemap[useidx] |= tidmap[useidx]; + spin_unlock(&uctxt->exp_lock); + + /* + * At this point, we know where in the map we have free bits. + * properly offset into the various "shadow" arrays and compute + * the RcvArray entry index. + */ + offset = ((useidx * BITS_PER_LONG) + bitidx) * + dd->rcv_entries.group_size; + pages = uctxt->tid_pg_list + offset; + phys = uctxt->physshadow + offset; + tid = uctxt->expected_base + offset; + + /* Calculate how many pages we can pin based on free bits */ + pinned = min((bits_used * dd->rcv_entries.group_size), + (npages - mapped)); + /* + * Now that we know how many free RcvArray entries we have, + * we can pin that many user pages. + */ + ret = hfi1_get_user_pages(vaddr + (mapped * PAGE_SIZE), + pinned, pages); + if (ret) { + /* + * We can't continue because the pages array won't be + * initialized. This should never happen, + * unless perhaps the user has mpin'ed the pages + * themselves. + */ + dd_dev_info(dd, + "Failed to lock addr %p, %u pages: errno %d\n", + (void *) vaddr, pinned, -ret); + /* + * Let go of the bits that we reserved since we are not + * going to use them. + */ + spin_lock(&uctxt->exp_lock); + uctxt->tidusemap[useidx] &= + ~(((1ULL << bits_used) - 1) << bitidx); + spin_unlock(&uctxt->exp_lock); + goto done; + } + /* + * How many groups do we need based on how many pages we have + * pinned? + */ + ngroups = (pinned / dd->rcv_entries.group_size) + + !!(pinned % dd->rcv_entries.group_size); + /* + * Keep programming RcvArray entries for all the <ngroups> free + * groups. + */ + for (i = 0, grp = 0; grp < ngroups; i++, grp++) { + unsigned j; + u32 pair_size = 0, tidsize; + /* + * This inner loop will program an entire group or the + * array of pinned pages (which ever limit is hit + * first). + */ + for (j = 0; j < dd->rcv_entries.group_size && + pmapped < pinned; j++, pmapped++, tid++) { + tidsize = PAGE_SIZE; + phys[pmapped] = hfi1_map_page(dd->pcidev, + pages[pmapped], 0, + tidsize, PCI_DMA_FROMDEVICE); + trace_hfi1_exp_rcv_set(uctxt->ctxt, + subctxt_fp(fp), + tid, vaddr, + phys[pmapped], + pages[pmapped]); + /* + * Each RcvArray entry is programmed with one + * page * worth of memory. This will handle + * the 8K MTU as well as anything smaller + * due to the fact that both entries in the + * RcvTidPair are programmed with a page. + * PSM currently does not handle anything + * bigger than 8K MTU, so should we even worry + * about 10K here? + */ + hfi1_put_tid(dd, tid, PT_EXPECTED, + phys[pmapped], + ilog2(tidsize >> PAGE_SHIFT) + 1); + pair_size += tidsize >> PAGE_SHIFT; + EXP_TID_RESET(tidlist[pairidx], LEN, pair_size); + if (!(tid % 2)) { + tidlist[pairidx] |= + EXP_TID_SET(IDX, + (tid - uctxt->expected_base) + / 2); + tidlist[pairidx] |= + EXP_TID_SET(CTRL, 1); + tidcnt++; + } else { + tidlist[pairidx] |= + EXP_TID_SET(CTRL, 2); + pair_size = 0; + pairidx++; + } + } + /* + * We've programmed the entire group (or as much of the + * group as we'll use. Now, it's time to push it out... + */ + flush_wc(); + } + mapped += pinned; + atomic_set(&uctxt->tidcursor, + (((useidx & 0xffffff) << 16) | + ((bitidx + bits_used) & 0xffffff))); + } + trace_hfi1_exp_tid_map(uctxt->ctxt, subctxt_fp(fp), 0, uctxt->tidusemap, + uctxt->tidmapcnt); + +done: + /* If we've mapped anything, copy relevant info to user */ + if (mapped) { + if (copy_to_user((void __user *)(unsigned long)tinfo->tidlist, + tidlist, sizeof(tidlist[0]) * tidcnt)) { + ret = -EFAULT; + goto done; + } + /* copy TID info to user */ + if (copy_to_user((void __user *)(unsigned long)tinfo->tidmap, + tidmap, sizeof(tidmap[0]) * uctxt->tidmapcnt)) + ret = -EFAULT; + } +bail: + /* + * Calculate mapped length. New Exp TID protocol does not "unwind" and + * report an error if it can't map the entire buffer. It just reports + * the length that was mapped. + */ + tinfo->length = mapped * PAGE_SIZE; + tinfo->tidcnt = tidcnt; + return ret; +} + +static int exp_tid_free(struct file *fp, struct hfi1_tid_info *tinfo) +{ + struct hfi1_ctxtdata *uctxt = ctxt_fp(fp); + struct hfi1_devdata *dd = uctxt->dd; + unsigned long tidmap[uctxt->tidmapcnt]; + struct page **pages; + dma_addr_t *phys; + u16 idx, bitidx, tid; + int ret = 0; + + if (copy_from_user(&tidmap, (void __user *)(unsigned long) + tinfo->tidmap, + sizeof(tidmap[0]) * uctxt->tidmapcnt)) { + ret = -EFAULT; + goto done; + } + for (idx = 0; idx < uctxt->tidmapcnt; idx++) { + unsigned long map; + + bitidx = 0; + if (!tidmap[idx]) + continue; + map = tidmap[idx]; + while ((bitidx = tzcnt(map)) < BITS_PER_LONG) { + int i, pcount = 0; + struct page *pshadow[dd->rcv_entries.group_size]; + unsigned offset = ((idx * BITS_PER_LONG) + bitidx) * + dd->rcv_entries.group_size; + + pages = uctxt->tid_pg_list + offset; + phys = uctxt->physshadow + offset; + tid = uctxt->expected_base + offset; + for (i = 0; i < dd->rcv_entries.group_size; + i++, tid++) { + if (pages[i]) { + hfi1_put_tid(dd, tid, PT_INVALID, + 0, 0); + trace_hfi1_exp_rcv_free(uctxt->ctxt, + subctxt_fp(fp), + tid, phys[i], + pages[i]); + pci_unmap_page(dd->pcidev, phys[i], + PAGE_SIZE, PCI_DMA_FROMDEVICE); + pshadow[pcount] = pages[i]; + pages[i] = NULL; + pcount++; + phys[i] = 0; + } + } + flush_wc(); + hfi1_release_user_pages(pshadow, pcount); + clear_bit(bitidx, &uctxt->tidusemap[idx]); + map &= ~(1ULL<<bitidx); + } + } + trace_hfi1_exp_tid_map(uctxt->ctxt, subctxt_fp(fp), 1, uctxt->tidusemap, + uctxt->tidmapcnt); +done: + return ret; +} + +static void unlock_exp_tids(struct hfi1_ctxtdata *uctxt) +{ + struct hfi1_devdata *dd = uctxt->dd; + unsigned tid; + + dd_dev_info(dd, "ctxt %u unlocking any locked expTID pages\n", + uctxt->ctxt); + for (tid = 0; tid < uctxt->expected_count; tid++) { + struct page *p = uctxt->tid_pg_list[tid]; + dma_addr_t phys; + + if (!p) + continue; + + phys = uctxt->physshadow[tid]; + uctxt->physshadow[tid] = 0; + uctxt->tid_pg_list[tid] = NULL; + pci_unmap_page(dd->pcidev, phys, PAGE_SIZE, PCI_DMA_FROMDEVICE); + hfi1_release_user_pages(&p, 1); + } +} + +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; + + switch (whence) { + case SEEK_SET: + break; + case SEEK_CUR: + offset += filp->f_pos; + break; + case SEEK_END: + offset = ((dd->kregend - dd->kregbase) + DC8051_DATA_MEM_SIZE) - + offset; + break; + default: + return -EINVAL; + } + + if (offset < 0) + return -EINVAL; + + if (offset >= (dd->kregend - dd->kregbase) + DC8051_DATA_MEM_SIZE) + return -EINVAL; + + filp->f_pos = offset; + + return filp->f_pos; +} + + +/* 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); + 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); + 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); + 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); +} |