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278 lines
6.6 KiB
278 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* VAS user space API for its accelerators (Only NX-GZIP is supported now) |
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* Copyright (C) 2019 Haren Myneni, IBM Corp |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/device.h> |
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#include <linux/cdev.h> |
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#include <linux/fs.h> |
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#include <linux/slab.h> |
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#include <linux/uaccess.h> |
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#include <asm/vas.h> |
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#include <uapi/asm/vas-api.h> |
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#include "vas.h" |
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/* |
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* The driver creates the device node that can be used as follows: |
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* For NX-GZIP |
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* |
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* fd = open("/dev/crypto/nx-gzip", O_RDWR); |
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* rc = ioctl(fd, VAS_TX_WIN_OPEN, &attr); |
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* paste_addr = mmap(NULL, PAGE_SIZE, prot, MAP_SHARED, fd, 0ULL). |
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* vas_copy(&crb, 0, 1); |
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* vas_paste(paste_addr, 0, 1); |
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* close(fd) or exit process to close window. |
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* |
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* where "vas_copy" and "vas_paste" are defined in copy-paste.h. |
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* copy/paste returns to the user space directly. So refer NX hardware |
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* documententation for exact copy/paste usage and completion / error |
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* conditions. |
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*/ |
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/* |
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* Wrapper object for the nx-gzip device - there is just one instance of |
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* this node for the whole system. |
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*/ |
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static struct coproc_dev { |
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struct cdev cdev; |
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struct device *device; |
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char *name; |
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dev_t devt; |
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struct class *class; |
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enum vas_cop_type cop_type; |
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} coproc_device; |
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struct coproc_instance { |
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struct coproc_dev *coproc; |
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struct vas_window *txwin; |
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}; |
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static char *coproc_devnode(struct device *dev, umode_t *mode) |
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{ |
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return kasprintf(GFP_KERNEL, "crypto/%s", dev_name(dev)); |
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} |
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static int coproc_open(struct inode *inode, struct file *fp) |
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{ |
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struct coproc_instance *cp_inst; |
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cp_inst = kzalloc(sizeof(*cp_inst), GFP_KERNEL); |
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if (!cp_inst) |
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return -ENOMEM; |
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cp_inst->coproc = container_of(inode->i_cdev, struct coproc_dev, |
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cdev); |
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fp->private_data = cp_inst; |
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return 0; |
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} |
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static int coproc_ioc_tx_win_open(struct file *fp, unsigned long arg) |
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{ |
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void __user *uptr = (void __user *)arg; |
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struct vas_tx_win_attr txattr = {}; |
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struct vas_tx_win_open_attr uattr; |
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struct coproc_instance *cp_inst; |
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struct vas_window *txwin; |
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int rc, vasid; |
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cp_inst = fp->private_data; |
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/* |
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* One window for file descriptor |
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*/ |
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if (cp_inst->txwin) |
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return -EEXIST; |
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rc = copy_from_user(&uattr, uptr, sizeof(uattr)); |
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if (rc) { |
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pr_err("%s(): copy_from_user() returns %d\n", __func__, rc); |
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return -EFAULT; |
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} |
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if (uattr.version != 1) { |
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pr_err("Invalid version\n"); |
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return -EINVAL; |
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} |
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vasid = uattr.vas_id; |
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vas_init_tx_win_attr(&txattr, cp_inst->coproc->cop_type); |
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txattr.lpid = mfspr(SPRN_LPID); |
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txattr.pidr = mfspr(SPRN_PID); |
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txattr.user_win = true; |
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txattr.rsvd_txbuf_count = false; |
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txattr.pswid = false; |
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pr_devel("Pid %d: Opening txwin, PIDR %ld\n", txattr.pidr, |
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mfspr(SPRN_PID)); |
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txwin = vas_tx_win_open(vasid, cp_inst->coproc->cop_type, &txattr); |
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if (IS_ERR(txwin)) { |
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pr_err("%s() vas_tx_win_open() failed, %ld\n", __func__, |
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PTR_ERR(txwin)); |
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return PTR_ERR(txwin); |
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} |
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cp_inst->txwin = txwin; |
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return 0; |
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} |
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static int coproc_release(struct inode *inode, struct file *fp) |
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{ |
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struct coproc_instance *cp_inst = fp->private_data; |
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if (cp_inst->txwin) { |
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vas_win_close(cp_inst->txwin); |
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cp_inst->txwin = NULL; |
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} |
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kfree(cp_inst); |
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fp->private_data = NULL; |
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/* |
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* We don't know here if user has other receive windows |
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* open, so we can't really call clear_thread_tidr(). |
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* So, once the process calls set_thread_tidr(), the |
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* TIDR value sticks around until process exits, resulting |
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* in an extra copy in restore_sprs(). |
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*/ |
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return 0; |
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} |
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static int coproc_mmap(struct file *fp, struct vm_area_struct *vma) |
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{ |
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struct coproc_instance *cp_inst = fp->private_data; |
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struct vas_window *txwin; |
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unsigned long pfn; |
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u64 paste_addr; |
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pgprot_t prot; |
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int rc; |
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txwin = cp_inst->txwin; |
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if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) { |
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pr_debug("%s(): size 0x%zx, PAGE_SIZE 0x%zx\n", __func__, |
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(vma->vm_end - vma->vm_start), PAGE_SIZE); |
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return -EINVAL; |
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} |
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/* Ensure instance has an open send window */ |
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if (!txwin) { |
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pr_err("%s(): No send window open?\n", __func__); |
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return -EINVAL; |
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} |
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vas_win_paste_addr(txwin, &paste_addr, NULL); |
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pfn = paste_addr >> PAGE_SHIFT; |
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/* flags, page_prot from cxl_mmap(), except we want cachable */ |
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vma->vm_flags |= VM_IO | VM_PFNMAP; |
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vma->vm_page_prot = pgprot_cached(vma->vm_page_prot); |
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prot = __pgprot(pgprot_val(vma->vm_page_prot) | _PAGE_DIRTY); |
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rc = remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff, |
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vma->vm_end - vma->vm_start, prot); |
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pr_devel("%s(): paste addr %llx at %lx, rc %d\n", __func__, |
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paste_addr, vma->vm_start, rc); |
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return rc; |
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} |
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static long coproc_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) |
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{ |
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switch (cmd) { |
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case VAS_TX_WIN_OPEN: |
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return coproc_ioc_tx_win_open(fp, arg); |
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default: |
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return -EINVAL; |
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} |
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} |
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static struct file_operations coproc_fops = { |
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.open = coproc_open, |
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.release = coproc_release, |
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.mmap = coproc_mmap, |
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.unlocked_ioctl = coproc_ioctl, |
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}; |
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/* |
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* Supporting only nx-gzip coprocessor type now, but this API code |
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* extended to other coprocessor types later. |
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*/ |
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int vas_register_coproc_api(struct module *mod, enum vas_cop_type cop_type, |
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const char *name) |
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{ |
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int rc = -EINVAL; |
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dev_t devno; |
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rc = alloc_chrdev_region(&coproc_device.devt, 1, 1, name); |
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if (rc) { |
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pr_err("Unable to allocate coproc major number: %i\n", rc); |
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return rc; |
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} |
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pr_devel("%s device allocated, dev [%i,%i]\n", name, |
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MAJOR(coproc_device.devt), MINOR(coproc_device.devt)); |
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coproc_device.class = class_create(mod, name); |
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if (IS_ERR(coproc_device.class)) { |
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rc = PTR_ERR(coproc_device.class); |
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pr_err("Unable to create %s class %d\n", name, rc); |
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goto err_class; |
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} |
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coproc_device.class->devnode = coproc_devnode; |
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coproc_device.cop_type = cop_type; |
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coproc_fops.owner = mod; |
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cdev_init(&coproc_device.cdev, &coproc_fops); |
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devno = MKDEV(MAJOR(coproc_device.devt), 0); |
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rc = cdev_add(&coproc_device.cdev, devno, 1); |
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if (rc) { |
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pr_err("cdev_add() failed %d\n", rc); |
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goto err_cdev; |
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} |
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coproc_device.device = device_create(coproc_device.class, NULL, |
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devno, NULL, name, MINOR(devno)); |
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if (IS_ERR(coproc_device.device)) { |
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rc = PTR_ERR(coproc_device.device); |
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pr_err("Unable to create coproc-%d %d\n", MINOR(devno), rc); |
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goto err; |
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} |
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pr_devel("%s: Added dev [%d,%d]\n", __func__, MAJOR(devno), |
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MINOR(devno)); |
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return 0; |
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err: |
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cdev_del(&coproc_device.cdev); |
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err_cdev: |
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class_destroy(coproc_device.class); |
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err_class: |
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unregister_chrdev_region(coproc_device.devt, 1); |
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return rc; |
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} |
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EXPORT_SYMBOL_GPL(vas_register_coproc_api); |
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void vas_unregister_coproc_api(void) |
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{ |
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dev_t devno; |
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cdev_del(&coproc_device.cdev); |
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devno = MKDEV(MAJOR(coproc_device.devt), 0); |
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device_destroy(coproc_device.class, devno); |
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class_destroy(coproc_device.class); |
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unregister_chrdev_region(coproc_device.devt, 1); |
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} |
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EXPORT_SYMBOL_GPL(vas_unregister_coproc_api);
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