1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * VAS user space API for its accelerators (Only NX-GZIP is supported now)
14 #include <uapi/asm/vas-api.h>
19  * For NX-GZIP
21  *	fd = open("/dev/crypto/nx-gzip", O_RDWR);
28  * where "vas_copy" and "vas_paste" are defined in copy-paste.h.
35  * Wrapper object for the nx-gzip device - there is just one instance of
43 	struct class *class;  member
63 		return -ENOMEM;  in coproc_open()
65 	cp_inst->coproc = container_of(inode->i_cdev, struct coproc_dev,  in coproc_open()
67 	fp->private_data = cp_inst;  in coproc_open()
81 	cp_inst = fp->private_data;  in coproc_ioc_tx_win_open()
86 	if (cp_inst->txwin)  in coproc_ioc_tx_win_open()
87 		return -EEXIST;  in coproc_ioc_tx_win_open()
91 		pr_err("%s(): copy_from_user() returns %d\n", __func__, rc);  in coproc_ioc_tx_win_open()
92 		return -EFAULT;  in coproc_ioc_tx_win_open()
97 		return -EINVAL;  in coproc_ioc_tx_win_open()
102 	vas_init_tx_win_attr(&txattr, cp_inst->coproc->cop_type);  in coproc_ioc_tx_win_open()
110 	pr_devel("Pid %d: Opening txwin, PIDR %ld\n", txattr.pidr,  in coproc_ioc_tx_win_open()
113 	txwin = vas_tx_win_open(vasid, cp_inst->coproc->cop_type, &txattr);  in coproc_ioc_tx_win_open()
120 	cp_inst->txwin = txwin;  in coproc_ioc_tx_win_open()
127 	struct coproc_instance *cp_inst = fp->private_data;  in coproc_release()
129 	if (cp_inst->txwin) {  in coproc_release()
130 		vas_win_close(cp_inst->txwin);  in coproc_release()
131 		cp_inst->txwin = NULL;  in coproc_release()
135 	fp->private_data = NULL;  in coproc_release()
150 	struct coproc_instance *cp_inst = fp->private_data;  in coproc_mmap()
157 	txwin = cp_inst->txwin;  in coproc_mmap()
159 	if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {  in coproc_mmap()
161 				(vma->vm_end - vma->vm_start), PAGE_SIZE);  in coproc_mmap()
162 		return -EINVAL;  in coproc_mmap()
168 		return -EINVAL;  in coproc_mmap()
175 	vma->vm_flags |= VM_IO | VM_PFNMAP;  in coproc_mmap()
176 	vma->vm_page_prot = pgprot_cached(vma->vm_page_prot);  in coproc_mmap()
178 	prot = __pgprot(pgprot_val(vma->vm_page_prot) | _PAGE_DIRTY);  in coproc_mmap()
180 	rc = remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,  in coproc_mmap()
181 			vma->vm_end - vma->vm_start, prot);  in coproc_mmap()
183 	pr_devel("%s(): paste addr %llx at %lx, rc %d\n", __func__,  in coproc_mmap()
184 			paste_addr, vma->vm_start, rc);  in coproc_mmap()
195 		return -EINVAL;  in coproc_ioctl()
207  * Supporting only nx-gzip coprocessor type now, but this API code
213 	int rc = -EINVAL;  in vas_register_coproc_api()
225 	coproc_device.class = class_create(mod, name);  in vas_register_coproc_api()
226 	if (IS_ERR(coproc_device.class)) {  in vas_register_coproc_api()
227 		rc = PTR_ERR(coproc_device.class);  in vas_register_coproc_api()
228 		pr_err("Unable to create %s class %d\n", name, rc);  in vas_register_coproc_api()
231 	coproc_device.class->devnode = coproc_devnode;  in vas_register_coproc_api()
240 		pr_err("cdev_add() failed %d\n", rc);  in vas_register_coproc_api()
244 	coproc_device.device = device_create(coproc_device.class, NULL,  in vas_register_coproc_api()
248 		pr_err("Unable to create coproc-%d %d\n", MINOR(devno), rc);  in vas_register_coproc_api()
252 	pr_devel("%s: Added dev [%d,%d]\n", __func__, MAJOR(devno),  in vas_register_coproc_api()
260 	class_destroy(coproc_device.class);  in vas_register_coproc_api()
273 	device_destroy(coproc_device.class, devno);  in vas_unregister_coproc_api()
275 	class_destroy(coproc_device.class);  in vas_unregister_coproc_api()