2 * IBM Accelerator Family 'GenWQE'
4 * (C) Copyright IBM Corp. 2013
6 * Author: Frank Haverkamp <haver@linux.vnet.ibm.com>
7 * Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com>
8 * Author: Michael Jung <mijung@de.ibm.com>
9 * Author: Michael Ruettger <michael@ibmra.de>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License (version 2 only)
13 * as published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
22 * Character device representation of the GenWQE device. This allows
23 * user-space applications to communicate with the card.
26 #include <linux/kernel.h>
27 #include <linux/types.h>
28 #include <linux/module.h>
29 #include <linux/pci.h>
30 #include <linux/string.h>
32 #include <linux/sched.h>
33 #include <linux/wait.h>
34 #include <linux/delay.h>
35 #include <linux/atomic.h>
37 #include "card_base.h"
38 #include "card_ddcb.h"
40 static int genwqe_open_files(struct genwqe_dev *cd)
45 spin_lock_irqsave(&cd->file_lock, flags);
46 rc = list_empty(&cd->file_list);
47 spin_unlock_irqrestore(&cd->file_lock, flags);
51 static void genwqe_add_file(struct genwqe_dev *cd, struct genwqe_file *cfile)
55 cfile->owner = current;
56 spin_lock_irqsave(&cd->file_lock, flags);
57 list_add(&cfile->list, &cd->file_list);
58 spin_unlock_irqrestore(&cd->file_lock, flags);
61 static int genwqe_del_file(struct genwqe_dev *cd, struct genwqe_file *cfile)
65 spin_lock_irqsave(&cd->file_lock, flags);
66 list_del(&cfile->list);
67 spin_unlock_irqrestore(&cd->file_lock, flags);
72 static void genwqe_add_pin(struct genwqe_file *cfile, struct dma_mapping *m)
76 spin_lock_irqsave(&cfile->pin_lock, flags);
77 list_add(&m->pin_list, &cfile->pin_list);
78 spin_unlock_irqrestore(&cfile->pin_lock, flags);
81 static int genwqe_del_pin(struct genwqe_file *cfile, struct dma_mapping *m)
85 spin_lock_irqsave(&cfile->pin_lock, flags);
86 list_del(&m->pin_list);
87 spin_unlock_irqrestore(&cfile->pin_lock, flags);
93 * genwqe_search_pin() - Search for the mapping for a userspace address
94 * @cfile: Descriptor of opened file
95 * @u_addr: User virtual address
96 * @size: Size of buffer
97 * @dma_addr: DMA address to be updated
99 * Return: Pointer to the corresponding mapping NULL if not found
101 static struct dma_mapping *genwqe_search_pin(struct genwqe_file *cfile,
102 unsigned long u_addr,
107 struct dma_mapping *m;
109 spin_lock_irqsave(&cfile->pin_lock, flags);
111 list_for_each_entry(m, &cfile->pin_list, pin_list) {
112 if ((((u64)m->u_vaddr) <= (u_addr)) &&
113 (((u64)m->u_vaddr + m->size) >= (u_addr + size))) {
116 *virt_addr = m->k_vaddr +
117 (u_addr - (u64)m->u_vaddr);
119 spin_unlock_irqrestore(&cfile->pin_lock, flags);
123 spin_unlock_irqrestore(&cfile->pin_lock, flags);
127 static void __genwqe_add_mapping(struct genwqe_file *cfile,
128 struct dma_mapping *dma_map)
132 spin_lock_irqsave(&cfile->map_lock, flags);
133 list_add(&dma_map->card_list, &cfile->map_list);
134 spin_unlock_irqrestore(&cfile->map_lock, flags);
137 static void __genwqe_del_mapping(struct genwqe_file *cfile,
138 struct dma_mapping *dma_map)
142 spin_lock_irqsave(&cfile->map_lock, flags);
143 list_del(&dma_map->card_list);
144 spin_unlock_irqrestore(&cfile->map_lock, flags);
149 * __genwqe_search_mapping() - Search for the mapping for a userspace address
150 * @cfile: descriptor of opened file
151 * @u_addr: user virtual address
152 * @size: size of buffer
153 * @dma_addr: DMA address to be updated
154 * Return: Pointer to the corresponding mapping NULL if not found
156 static struct dma_mapping *__genwqe_search_mapping(struct genwqe_file *cfile,
157 unsigned long u_addr,
159 dma_addr_t *dma_addr,
163 struct dma_mapping *m;
164 struct pci_dev *pci_dev = cfile->cd->pci_dev;
166 spin_lock_irqsave(&cfile->map_lock, flags);
167 list_for_each_entry(m, &cfile->map_list, card_list) {
169 if ((((u64)m->u_vaddr) <= (u_addr)) &&
170 (((u64)m->u_vaddr + m->size) >= (u_addr + size))) {
172 /* match found: current is as expected and
175 *dma_addr = m->dma_addr +
176 (u_addr - (u64)m->u_vaddr);
179 *virt_addr = m->k_vaddr +
180 (u_addr - (u64)m->u_vaddr);
182 spin_unlock_irqrestore(&cfile->map_lock, flags);
186 spin_unlock_irqrestore(&cfile->map_lock, flags);
188 dev_err(&pci_dev->dev,
189 "[%s] Entry not found: u_addr=%lx, size=%x\n",
190 __func__, u_addr, size);
195 static void genwqe_remove_mappings(struct genwqe_file *cfile)
198 struct list_head *node, *next;
199 struct dma_mapping *dma_map;
200 struct genwqe_dev *cd = cfile->cd;
201 struct pci_dev *pci_dev = cfile->cd->pci_dev;
203 list_for_each_safe(node, next, &cfile->map_list) {
204 dma_map = list_entry(node, struct dma_mapping, card_list);
206 list_del_init(&dma_map->card_list);
209 * This is really a bug, because those things should
210 * have been already tidied up.
212 * GENWQE_MAPPING_RAW should have been removed via mmunmap().
213 * GENWQE_MAPPING_SGL_TEMP should be removed by tidy up code.
215 dev_err(&pci_dev->dev,
216 "[%s] %d. cleanup mapping: u_vaddr=%p "
217 "u_kaddr=%016lx dma_addr=%lx\n", __func__, i++,
218 dma_map->u_vaddr, (unsigned long)dma_map->k_vaddr,
219 (unsigned long)dma_map->dma_addr);
221 if (dma_map->type == GENWQE_MAPPING_RAW) {
222 /* we allocated this dynamically */
223 __genwqe_free_consistent(cd, dma_map->size,
227 } else if (dma_map->type == GENWQE_MAPPING_SGL_TEMP) {
228 /* we use dma_map statically from the request */
229 genwqe_user_vunmap(cd, dma_map, NULL);
234 static void genwqe_remove_pinnings(struct genwqe_file *cfile)
236 struct list_head *node, *next;
237 struct dma_mapping *dma_map;
238 struct genwqe_dev *cd = cfile->cd;
240 list_for_each_safe(node, next, &cfile->pin_list) {
241 dma_map = list_entry(node, struct dma_mapping, pin_list);
244 * This is not a bug, because a killed processed might
245 * not call the unpin ioctl, which is supposed to free
248 * Pinnings are dymically allocated and need to be
251 list_del_init(&dma_map->pin_list);
252 genwqe_user_vunmap(cd, dma_map, NULL);
258 * genwqe_kill_fasync() - Send signal to all processes with open GenWQE files
260 * E.g. genwqe_send_signal(cd, SIGIO);
262 static int genwqe_kill_fasync(struct genwqe_dev *cd, int sig)
264 unsigned int files = 0;
266 struct genwqe_file *cfile;
268 spin_lock_irqsave(&cd->file_lock, flags);
269 list_for_each_entry(cfile, &cd->file_list, list) {
270 if (cfile->async_queue)
271 kill_fasync(&cfile->async_queue, sig, POLL_HUP);
274 spin_unlock_irqrestore(&cd->file_lock, flags);
278 static int genwqe_force_sig(struct genwqe_dev *cd, int sig)
280 unsigned int files = 0;
282 struct genwqe_file *cfile;
284 spin_lock_irqsave(&cd->file_lock, flags);
285 list_for_each_entry(cfile, &cd->file_list, list) {
286 force_sig(sig, cfile->owner);
289 spin_unlock_irqrestore(&cd->file_lock, flags);
294 * genwqe_open() - file open
295 * @inode: file system information
298 * This function is executed whenever an application calls
299 * open("/dev/genwqe",..).
301 * Return: 0 if successful or <0 if errors
303 static int genwqe_open(struct inode *inode, struct file *filp)
305 struct genwqe_dev *cd;
306 struct genwqe_file *cfile;
307 struct pci_dev *pci_dev;
309 cfile = kzalloc(sizeof(*cfile), GFP_KERNEL);
313 cd = container_of(inode->i_cdev, struct genwqe_dev, cdev_genwqe);
314 pci_dev = cd->pci_dev;
317 cfile->client = NULL;
319 spin_lock_init(&cfile->map_lock); /* list of raw memory allocations */
320 INIT_LIST_HEAD(&cfile->map_list);
322 spin_lock_init(&cfile->pin_lock); /* list of user pinned memory */
323 INIT_LIST_HEAD(&cfile->pin_list);
325 filp->private_data = cfile;
327 genwqe_add_file(cd, cfile);
332 * genwqe_fasync() - Setup process to receive SIGIO.
333 * @fd: file descriptor
337 * Sending a signal is working as following:
339 * if (cdev->async_queue)
340 * kill_fasync(&cdev->async_queue, SIGIO, POLL_IN);
342 * Some devices also implement asynchronous notification to indicate
343 * when the device can be written; in this case, of course,
344 * kill_fasync must be called with a mode of POLL_OUT.
346 static int genwqe_fasync(int fd, struct file *filp, int mode)
348 struct genwqe_file *cdev = (struct genwqe_file *)filp->private_data;
349 return fasync_helper(fd, filp, mode, &cdev->async_queue);
354 * genwqe_release() - file close
355 * @inode: file system information
358 * This function is executed whenever an application calls 'close(fd_genwqe)'
362 static int genwqe_release(struct inode *inode, struct file *filp)
364 struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
365 struct genwqe_dev *cd = cfile->cd;
367 /* there must be no entries in these lists! */
368 genwqe_remove_mappings(cfile);
369 genwqe_remove_pinnings(cfile);
371 /* remove this filp from the asynchronously notified filp's */
372 genwqe_fasync(-1, filp, 0);
375 * For this to work we must not release cd when this cfile is
376 * not yet released, otherwise the list entry is invalid,
377 * because the list itself gets reinstantiated!
379 genwqe_del_file(cd, cfile);
384 static void genwqe_vma_open(struct vm_area_struct *vma)
390 * genwqe_vma_close() - Called each time when vma is unmapped
392 * Free memory which got allocated by GenWQE mmap().
394 static void genwqe_vma_close(struct vm_area_struct *vma)
396 unsigned long vsize = vma->vm_end - vma->vm_start;
397 struct inode *inode = vma->vm_file->f_dentry->d_inode;
398 struct dma_mapping *dma_map;
399 struct genwqe_dev *cd = container_of(inode->i_cdev, struct genwqe_dev,
401 struct pci_dev *pci_dev = cd->pci_dev;
402 dma_addr_t d_addr = 0;
403 struct genwqe_file *cfile = vma->vm_private_data;
405 dma_map = __genwqe_search_mapping(cfile, vma->vm_start, vsize,
407 if (dma_map == NULL) {
408 dev_err(&pci_dev->dev,
409 " [%s] err: mapping not found: v=%lx, p=%lx s=%lx\n",
410 __func__, vma->vm_start, vma->vm_pgoff << PAGE_SHIFT,
414 __genwqe_del_mapping(cfile, dma_map);
415 __genwqe_free_consistent(cd, dma_map->size, dma_map->k_vaddr,
420 static struct vm_operations_struct genwqe_vma_ops = {
421 .open = genwqe_vma_open,
422 .close = genwqe_vma_close,
426 * genwqe_mmap() - Provide contignous buffers to userspace
428 * We use mmap() to allocate contignous buffers used for DMA
429 * transfers. After the buffer is allocated we remap it to user-space
430 * and remember a reference to our dma_mapping data structure, where
431 * we store the associated DMA address and allocated size.
433 * When we receive a DDCB execution request with the ATS bits set to
434 * plain buffer, we lookup our dma_mapping list to find the
435 * corresponding DMA address for the associated user-space address.
437 static int genwqe_mmap(struct file *filp, struct vm_area_struct *vma)
440 unsigned long pfn, vsize = vma->vm_end - vma->vm_start;
441 struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
442 struct genwqe_dev *cd = cfile->cd;
443 struct dma_mapping *dma_map;
448 if (get_order(vsize) > MAX_ORDER)
451 dma_map = kzalloc(sizeof(struct dma_mapping), GFP_ATOMIC);
455 genwqe_mapping_init(dma_map, GENWQE_MAPPING_RAW);
456 dma_map->u_vaddr = (void *)vma->vm_start;
457 dma_map->size = vsize;
458 dma_map->nr_pages = DIV_ROUND_UP(vsize, PAGE_SIZE);
459 dma_map->k_vaddr = __genwqe_alloc_consistent(cd, vsize,
461 if (dma_map->k_vaddr == NULL) {
466 if (capable(CAP_SYS_ADMIN) && (vsize > sizeof(dma_addr_t)))
467 *(dma_addr_t *)dma_map->k_vaddr = dma_map->dma_addr;
469 pfn = virt_to_phys(dma_map->k_vaddr) >> PAGE_SHIFT;
470 rc = remap_pfn_range(vma,
480 vma->vm_private_data = cfile;
481 vma->vm_ops = &genwqe_vma_ops;
482 __genwqe_add_mapping(cfile, dma_map);
487 __genwqe_free_consistent(cd, dma_map->size,
496 * do_flash_update() - Excute flash update (write image or CVPD)
498 * @load: details about image load
500 * Return: 0 if successful
503 #define FLASH_BLOCK 0x40000 /* we use 256k blocks */
505 static int do_flash_update(struct genwqe_file *cfile,
506 struct genwqe_bitstream *load)
517 struct genwqe_dev *cd = cfile->cd;
518 struct pci_dev *pci_dev = cd->pci_dev;
520 if ((load->size & 0x3) != 0)
523 if (((unsigned long)(load->data_addr) & ~PAGE_MASK) != 0)
526 /* FIXME Bits have changed for new service layer! */
527 switch ((char)load->partition) {
530 break; /* download/erase_first/part_0 */
533 break; /* download/erase_first/part_1 */
534 case 'v': /* cmdopts = 0x0c (VPD) */
539 buf = (u8 __user *)load->data_addr;
540 xbuf = __genwqe_alloc_consistent(cd, FLASH_BLOCK, &dma_addr);
544 blocks_to_flash = load->size / FLASH_BLOCK;
546 struct genwqe_ddcb_cmd *req;
549 * We must be 4 byte aligned. Buffer must be 0 appened
550 * to have defined values when calculating CRC.
552 tocopy = min_t(size_t, load->size, FLASH_BLOCK);
554 rc = copy_from_user(xbuf, buf, tocopy);
559 crc = genwqe_crc32(xbuf, tocopy, 0xffffffff);
561 dev_dbg(&pci_dev->dev,
562 "[%s] DMA: %lx CRC: %08x SZ: %ld %d\n",
563 __func__, (unsigned long)dma_addr, crc, tocopy,
566 /* prepare DDCB for SLU process */
567 req = ddcb_requ_alloc();
573 req->cmd = SLCMD_MOVE_FLASH;
574 req->cmdopts = cmdopts;
576 /* prepare invariant values */
577 if (genwqe_get_slu_id(cd) <= 0x2) {
578 *(__be64 *)&req->__asiv[0] = cpu_to_be64(dma_addr);
579 *(__be64 *)&req->__asiv[8] = cpu_to_be64(tocopy);
580 *(__be64 *)&req->__asiv[16] = cpu_to_be64(flash);
581 *(__be32 *)&req->__asiv[24] = cpu_to_be32(0);
582 req->__asiv[24] = load->uid;
583 *(__be32 *)&req->__asiv[28] = cpu_to_be32(crc);
585 /* for simulation only */
586 *(__be64 *)&req->__asiv[88] = cpu_to_be64(load->slu_id);
587 *(__be64 *)&req->__asiv[96] = cpu_to_be64(load->app_id);
588 req->asiv_length = 32; /* bytes included in crc calc */
589 } else { /* setup DDCB for ATS architecture */
590 *(__be64 *)&req->asiv[0] = cpu_to_be64(dma_addr);
591 *(__be32 *)&req->asiv[8] = cpu_to_be32(tocopy);
592 *(__be32 *)&req->asiv[12] = cpu_to_be32(0); /* resvd */
593 *(__be64 *)&req->asiv[16] = cpu_to_be64(flash);
594 *(__be32 *)&req->asiv[24] = cpu_to_be32(load->uid<<24);
595 *(__be32 *)&req->asiv[28] = cpu_to_be32(crc);
597 /* for simulation only */
598 *(__be64 *)&req->asiv[80] = cpu_to_be64(load->slu_id);
599 *(__be64 *)&req->asiv[88] = cpu_to_be64(load->app_id);
602 req->ats = 0x4ULL << 44;
603 req->asiv_length = 40; /* bytes included in crc calc */
607 /* For Genwqe5 we get back the calculated CRC */
608 *(u64 *)&req->asv[0] = 0ULL; /* 0x80 */
610 rc = __genwqe_execute_raw_ddcb(cd, req);
612 load->retc = req->retc;
613 load->attn = req->attn;
614 load->progress = req->progress;
621 if (req->retc != DDCB_RETC_COMPLETE) {
627 load->size -= tocopy;
635 __genwqe_free_consistent(cd, FLASH_BLOCK, xbuf, dma_addr);
639 static int do_flash_read(struct genwqe_file *cfile,
640 struct genwqe_bitstream *load)
642 int rc, blocks_to_flash;
649 struct genwqe_dev *cd = cfile->cd;
650 struct pci_dev *pci_dev = cd->pci_dev;
651 struct genwqe_ddcb_cmd *cmd;
653 if ((load->size & 0x3) != 0)
656 if (((unsigned long)(load->data_addr) & ~PAGE_MASK) != 0)
659 /* FIXME Bits have changed for new service layer! */
660 switch ((char)load->partition) {
663 break; /* upload/part_0 */
666 break; /* upload/part_1 */
672 buf = (u8 __user *)load->data_addr;
673 xbuf = __genwqe_alloc_consistent(cd, FLASH_BLOCK, &dma_addr);
677 blocks_to_flash = load->size / FLASH_BLOCK;
680 * We must be 4 byte aligned. Buffer must be 0 appened
681 * to have defined values when calculating CRC.
683 tocopy = min_t(size_t, load->size, FLASH_BLOCK);
685 dev_dbg(&pci_dev->dev,
686 "[%s] DMA: %lx SZ: %ld %d\n",
687 __func__, (unsigned long)dma_addr, tocopy,
690 /* prepare DDCB for SLU process */
691 cmd = ddcb_requ_alloc();
696 cmd->cmd = SLCMD_MOVE_FLASH;
697 cmd->cmdopts = cmdopts;
699 /* prepare invariant values */
700 if (genwqe_get_slu_id(cd) <= 0x2) {
701 *(__be64 *)&cmd->__asiv[0] = cpu_to_be64(dma_addr);
702 *(__be64 *)&cmd->__asiv[8] = cpu_to_be64(tocopy);
703 *(__be64 *)&cmd->__asiv[16] = cpu_to_be64(flash);
704 *(__be32 *)&cmd->__asiv[24] = cpu_to_be32(0);
705 cmd->__asiv[24] = load->uid;
706 *(__be32 *)&cmd->__asiv[28] = cpu_to_be32(0) /* CRC */;
707 cmd->asiv_length = 32; /* bytes included in crc calc */
708 } else { /* setup DDCB for ATS architecture */
709 *(__be64 *)&cmd->asiv[0] = cpu_to_be64(dma_addr);
710 *(__be32 *)&cmd->asiv[8] = cpu_to_be32(tocopy);
711 *(__be32 *)&cmd->asiv[12] = cpu_to_be32(0); /* resvd */
712 *(__be64 *)&cmd->asiv[16] = cpu_to_be64(flash);
713 *(__be32 *)&cmd->asiv[24] = cpu_to_be32(load->uid<<24);
714 *(__be32 *)&cmd->asiv[28] = cpu_to_be32(0); /* CRC */
717 cmd->ats = 0x5ULL << 44;
718 cmd->asiv_length = 40; /* bytes included in crc calc */
722 /* we only get back the calculated CRC */
723 *(u64 *)&cmd->asv[0] = 0ULL; /* 0x80 */
725 rc = __genwqe_execute_raw_ddcb(cd, cmd);
727 load->retc = cmd->retc;
728 load->attn = cmd->attn;
729 load->progress = cmd->progress;
731 if ((rc < 0) && (rc != -EBADMSG)) {
736 rc = copy_to_user(buf, xbuf, tocopy);
743 /* We know that we can get retc 0x104 with CRC err */
744 if (((cmd->retc == DDCB_RETC_FAULT) &&
745 (cmd->attn != 0x02)) || /* Normally ignore CRC error */
746 ((cmd->retc == DDCB_RETC_COMPLETE) &&
747 (cmd->attn != 0x00))) { /* Everything was fine */
753 load->size -= tocopy;
762 __genwqe_free_consistent(cd, FLASH_BLOCK, xbuf, dma_addr);
766 static int genwqe_pin_mem(struct genwqe_file *cfile, struct genwqe_mem *m)
769 struct genwqe_dev *cd = cfile->cd;
770 struct pci_dev *pci_dev = cfile->cd->pci_dev;
771 struct dma_mapping *dma_map;
772 unsigned long map_addr;
773 unsigned long map_size;
775 if ((m->addr == 0x0) || (m->size == 0))
778 map_addr = (m->addr & PAGE_MASK);
779 map_size = round_up(m->size + (m->addr & ~PAGE_MASK), PAGE_SIZE);
781 dma_map = kzalloc(sizeof(struct dma_mapping), GFP_ATOMIC);
785 genwqe_mapping_init(dma_map, GENWQE_MAPPING_SGL_PINNED);
786 rc = genwqe_user_vmap(cd, dma_map, (void *)map_addr, map_size, NULL);
788 dev_err(&pci_dev->dev,
789 "[%s] genwqe_user_vmap rc=%d\n", __func__, rc);
793 genwqe_add_pin(cfile, dma_map);
797 static int genwqe_unpin_mem(struct genwqe_file *cfile, struct genwqe_mem *m)
799 struct genwqe_dev *cd = cfile->cd;
800 struct dma_mapping *dma_map;
801 unsigned long map_addr;
802 unsigned long map_size;
807 map_addr = (m->addr & PAGE_MASK);
808 map_size = round_up(m->size + (m->addr & ~PAGE_MASK), PAGE_SIZE);
810 dma_map = genwqe_search_pin(cfile, map_addr, map_size, NULL);
814 genwqe_del_pin(cfile, dma_map);
815 genwqe_user_vunmap(cd, dma_map, NULL);
821 * ddcb_cmd_cleanup() - Remove dynamically created fixup entries
823 * Only if there are any. Pinnings are not removed.
825 static int ddcb_cmd_cleanup(struct genwqe_file *cfile, struct ddcb_requ *req)
828 struct dma_mapping *dma_map;
829 struct genwqe_dev *cd = cfile->cd;
831 for (i = 0; i < DDCB_FIXUPS; i++) {
832 dma_map = &req->dma_mappings[i];
834 if (dma_mapping_used(dma_map)) {
835 __genwqe_del_mapping(cfile, dma_map);
836 genwqe_user_vunmap(cd, dma_map, req);
838 if (req->sgl[i] != NULL) {
839 genwqe_free_sgl(cd, req->sgl[i],
840 req->sgl_dma_addr[i],
843 req->sgl_dma_addr[i] = 0x0;
844 req->sgl_size[i] = 0;
852 * ddcb_cmd_fixups() - Establish DMA fixups/sglists for user memory references
854 * Before the DDCB gets executed we need to handle the fixups. We
855 * replace the user-space addresses with DMA addresses or do
856 * additional setup work e.g. generating a scatter-gather list which
857 * is used to describe the memory referred to in the fixup.
859 static int ddcb_cmd_fixups(struct genwqe_file *cfile, struct ddcb_requ *req)
862 unsigned int asiv_offs, i;
863 struct genwqe_dev *cd = cfile->cd;
864 struct genwqe_ddcb_cmd *cmd = &req->cmd;
865 struct dma_mapping *m;
866 const char *type = "UNKNOWN";
868 for (i = 0, asiv_offs = 0x00; asiv_offs <= 0x58;
869 i++, asiv_offs += 0x08) {
876 ats_flags = ATS_GET_FLAGS(cmd->ats, asiv_offs);
881 break; /* nothing to do here */
883 case ATS_TYPE_FLAT_RDWR:
884 case ATS_TYPE_FLAT_RD: {
885 u_addr = be64_to_cpu(*((__be64 *)&cmd->
887 u_size = be32_to_cpu(*((__be32 *)&cmd->
888 asiv[asiv_offs + 0x08]));
891 * No data available. Ignore u_addr in this
892 * case and set addr to 0. Hardware must not
896 *((__be64 *)&cmd->asiv[asiv_offs]) =
901 m = __genwqe_search_mapping(cfile, u_addr, u_size,
908 *((__be64 *)&cmd->asiv[asiv_offs]) =
913 case ATS_TYPE_SGL_RDWR:
914 case ATS_TYPE_SGL_RD: {
915 int page_offs, nr_pages, offs;
917 u_addr = be64_to_cpu(*((__be64 *)
918 &cmd->asiv[asiv_offs]));
919 u_size = be32_to_cpu(*((__be32 *)
920 &cmd->asiv[asiv_offs + 0x08]));
923 * No data available. Ignore u_addr in this
924 * case and set addr to 0. Hardware must not
925 * fetch the empty sgl.
928 *((__be64 *)&cmd->asiv[asiv_offs]) =
933 m = genwqe_search_pin(cfile, u_addr, u_size, NULL);
936 page_offs = (u_addr -
937 (u64)m->u_vaddr)/PAGE_SIZE;
940 m = &req->dma_mappings[i];
942 genwqe_mapping_init(m,
943 GENWQE_MAPPING_SGL_TEMP);
944 rc = genwqe_user_vmap(cd, m, (void *)u_addr,
949 __genwqe_add_mapping(cfile, m);
953 offs = offset_in_page(u_addr);
954 nr_pages = DIV_ROUND_UP(offs + u_size, PAGE_SIZE);
956 /* create genwqe style scatter gather list */
957 req->sgl[i] = genwqe_alloc_sgl(cd, m->nr_pages,
958 &req->sgl_dma_addr[i],
960 if (req->sgl[i] == NULL) {
964 genwqe_setup_sgl(cd, offs, u_size,
966 req->sgl_dma_addr[i],
972 *((__be64 *)&cmd->asiv[asiv_offs]) =
973 cpu_to_be64(req->sgl_dma_addr[i]);
985 ddcb_cmd_cleanup(cfile, req);
990 * genwqe_execute_ddcb() - Execute DDCB using userspace address fixups
992 * The code will build up the translation tables or lookup the
993 * contignous memory allocation table to find the right translations
996 static int genwqe_execute_ddcb(struct genwqe_file *cfile,
997 struct genwqe_ddcb_cmd *cmd)
1000 struct genwqe_dev *cd = cfile->cd;
1001 struct ddcb_requ *req = container_of(cmd, struct ddcb_requ, cmd);
1003 rc = ddcb_cmd_fixups(cfile, req);
1007 rc = __genwqe_execute_raw_ddcb(cd, cmd);
1008 ddcb_cmd_cleanup(cfile, req);
1012 static int do_execute_ddcb(struct genwqe_file *cfile,
1013 unsigned long arg, int raw)
1016 struct genwqe_ddcb_cmd *cmd;
1017 struct ddcb_requ *req;
1018 struct genwqe_dev *cd = cfile->cd;
1020 cmd = ddcb_requ_alloc();
1024 req = container_of(cmd, struct ddcb_requ, cmd);
1026 if (copy_from_user(cmd, (void __user *)arg, sizeof(*cmd))) {
1027 ddcb_requ_free(cmd);
1032 rc = genwqe_execute_ddcb(cfile, cmd);
1034 rc = __genwqe_execute_raw_ddcb(cd, cmd);
1036 /* Copy back only the modifed fields. Do not copy ASIV
1037 back since the copy got modified by the driver. */
1038 if (copy_to_user((void __user *)arg, cmd,
1039 sizeof(*cmd) - DDCB_ASIV_LENGTH)) {
1040 ddcb_requ_free(cmd);
1044 ddcb_requ_free(cmd);
1049 * genwqe_ioctl() - IO control
1050 * @filp: file handle
1051 * @cmd: command identifier (passed from user)
1052 * @arg: argument (passed from user)
1056 static long genwqe_ioctl(struct file *filp, unsigned int cmd,
1060 struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
1061 struct genwqe_dev *cd = cfile->cd;
1062 struct genwqe_reg_io __user *io;
1066 if (_IOC_TYPE(cmd) != GENWQE_IOC_CODE)
1071 case GENWQE_GET_CARD_STATE:
1072 put_user(cd->card_state, (enum genwqe_card_state __user *)arg);
1075 /* Register access */
1076 case GENWQE_READ_REG64: {
1077 io = (struct genwqe_reg_io __user *)arg;
1079 if (get_user(reg_offs, &io->num))
1082 if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x7))
1085 val = __genwqe_readq(cd, reg_offs);
1086 put_user(val, &io->val64);
1090 case GENWQE_WRITE_REG64: {
1091 io = (struct genwqe_reg_io __user *)arg;
1093 if (!capable(CAP_SYS_ADMIN))
1096 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1099 if (get_user(reg_offs, &io->num))
1102 if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x7))
1105 if (get_user(val, &io->val64))
1108 __genwqe_writeq(cd, reg_offs, val);
1112 case GENWQE_READ_REG32: {
1113 io = (struct genwqe_reg_io __user *)arg;
1115 if (get_user(reg_offs, &io->num))
1118 if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x3))
1121 val = __genwqe_readl(cd, reg_offs);
1122 put_user(val, &io->val64);
1126 case GENWQE_WRITE_REG32: {
1127 io = (struct genwqe_reg_io __user *)arg;
1129 if (!capable(CAP_SYS_ADMIN))
1132 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1135 if (get_user(reg_offs, &io->num))
1138 if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x3))
1141 if (get_user(val, &io->val64))
1144 __genwqe_writel(cd, reg_offs, val);
1148 /* Flash update/reading */
1149 case GENWQE_SLU_UPDATE: {
1150 struct genwqe_bitstream load;
1152 if (!genwqe_is_privileged(cd))
1155 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1158 if (copy_from_user(&load, (void __user *)arg,
1162 rc = do_flash_update(cfile, &load);
1164 if (copy_to_user((void __user *)arg, &load, sizeof(load)))
1170 case GENWQE_SLU_READ: {
1171 struct genwqe_bitstream load;
1173 if (!genwqe_is_privileged(cd))
1176 if (genwqe_flash_readback_fails(cd))
1177 return -ENOSPC; /* known to fail for old versions */
1179 if (copy_from_user(&load, (void __user *)arg, sizeof(load)))
1182 rc = do_flash_read(cfile, &load);
1184 if (copy_to_user((void __user *)arg, &load, sizeof(load)))
1190 /* memory pinning and unpinning */
1191 case GENWQE_PIN_MEM: {
1192 struct genwqe_mem m;
1194 if (copy_from_user(&m, (void __user *)arg, sizeof(m)))
1197 return genwqe_pin_mem(cfile, &m);
1200 case GENWQE_UNPIN_MEM: {
1201 struct genwqe_mem m;
1203 if (copy_from_user(&m, (void __user *)arg, sizeof(m)))
1206 return genwqe_unpin_mem(cfile, &m);
1209 /* launch an DDCB and wait for completion */
1210 case GENWQE_EXECUTE_DDCB:
1211 return do_execute_ddcb(cfile, arg, 0);
1213 case GENWQE_EXECUTE_RAW_DDCB: {
1215 if (!capable(CAP_SYS_ADMIN))
1218 return do_execute_ddcb(cfile, arg, 1);
1228 #if defined(CONFIG_COMPAT)
1230 * genwqe_compat_ioctl() - Compatibility ioctl
1232 * Called whenever a 32-bit process running under a 64-bit kernel
1233 * performs an ioctl on /dev/genwqe<n>_card.
1235 * @filp: file pointer.
1237 * @arg: user argument.
1238 * Return: zero on success or negative number on failure.
1240 static long genwqe_compat_ioctl(struct file *filp, unsigned int cmd,
1243 return genwqe_ioctl(filp, cmd, arg);
1245 #endif /* defined(CONFIG_COMPAT) */
1247 static const struct file_operations genwqe_fops = {
1248 .owner = THIS_MODULE,
1249 .open = genwqe_open,
1250 .fasync = genwqe_fasync,
1251 .mmap = genwqe_mmap,
1252 .unlocked_ioctl = genwqe_ioctl,
1253 #if defined(CONFIG_COMPAT)
1254 .compat_ioctl = genwqe_compat_ioctl,
1256 .release = genwqe_release,
1259 static int genwqe_device_initialized(struct genwqe_dev *cd)
1261 return cd->dev != NULL;
1265 * genwqe_device_create() - Create and configure genwqe char device
1266 * @cd: genwqe device descriptor
1268 * This function must be called before we create any more genwqe
1269 * character devices, because it is allocating the major and minor
1270 * number which are supposed to be used by the client drivers.
1272 int genwqe_device_create(struct genwqe_dev *cd)
1275 struct pci_dev *pci_dev = cd->pci_dev;
1278 * Here starts the individual setup per client. It must
1279 * initialize its own cdev data structure with its own fops.
1280 * The appropriate devnum needs to be created. The ranges must
1283 rc = alloc_chrdev_region(&cd->devnum_genwqe, 0,
1284 GENWQE_MAX_MINOR, GENWQE_DEVNAME);
1286 dev_err(&pci_dev->dev, "err: alloc_chrdev_region failed\n");
1290 cdev_init(&cd->cdev_genwqe, &genwqe_fops);
1291 cd->cdev_genwqe.owner = THIS_MODULE;
1293 rc = cdev_add(&cd->cdev_genwqe, cd->devnum_genwqe, 1);
1295 dev_err(&pci_dev->dev, "err: cdev_add failed\n");
1300 * Finally the device in /dev/... must be created. The rule is
1301 * to use card%d_clientname for each created device.
1303 cd->dev = device_create_with_groups(cd->class_genwqe,
1305 cd->devnum_genwqe, cd,
1306 genwqe_attribute_groups,
1307 GENWQE_DEVNAME "%u_card",
1309 if (IS_ERR(cd->dev)) {
1310 rc = PTR_ERR(cd->dev);
1314 rc = genwqe_init_debugfs(cd);
1321 device_destroy(cd->class_genwqe, cd->devnum_genwqe);
1323 cdev_del(&cd->cdev_genwqe);
1325 unregister_chrdev_region(cd->devnum_genwqe, GENWQE_MAX_MINOR);
1331 static int genwqe_inform_and_stop_processes(struct genwqe_dev *cd)
1335 struct pci_dev *pci_dev = cd->pci_dev;
1337 if (!genwqe_open_files(cd))
1340 dev_warn(&pci_dev->dev, "[%s] send SIGIO and wait ...\n", __func__);
1342 rc = genwqe_kill_fasync(cd, SIGIO);
1344 /* give kill_timeout seconds to close file descriptors ... */
1345 for (i = 0; (i < genwqe_kill_timeout) &&
1346 genwqe_open_files(cd); i++) {
1347 dev_info(&pci_dev->dev, " %d sec ...", i);
1353 /* if no open files we can safely continue, else ... */
1354 if (!genwqe_open_files(cd))
1357 dev_warn(&pci_dev->dev,
1358 "[%s] send SIGKILL and wait ...\n", __func__);
1360 rc = genwqe_force_sig(cd, SIGKILL); /* force terminate */
1362 /* Give kill_timout more seconds to end processes */
1363 for (i = 0; (i < genwqe_kill_timeout) &&
1364 genwqe_open_files(cd); i++) {
1365 dev_warn(&pci_dev->dev, " %d sec ...", i);
1376 * genwqe_device_remove() - Remove genwqe's char device
1378 * This function must be called after the client devices are removed
1379 * because it will free the major/minor number range for the genwqe
1382 * This function must be robust enough to be called twice.
1384 int genwqe_device_remove(struct genwqe_dev *cd)
1387 struct pci_dev *pci_dev = cd->pci_dev;
1389 if (!genwqe_device_initialized(cd))
1392 genwqe_inform_and_stop_processes(cd);
1395 * We currently do wait until all filedescriptors are
1396 * closed. This leads to a problem when we abort the
1397 * application which will decrease this reference from
1398 * 1/unused to 0/illegal and not from 2/used 1/empty.
1400 rc = atomic_read(&cd->cdev_genwqe.kobj.kref.refcount);
1402 dev_err(&pci_dev->dev,
1403 "[%s] err: cdev_genwqe...refcount=%d\n", __func__, rc);
1404 panic("Fatal err: cannot free resources with pending references!");
1407 genqwe_exit_debugfs(cd);
1408 device_destroy(cd->class_genwqe, cd->devnum_genwqe);
1409 cdev_del(&cd->cdev_genwqe);
1410 unregister_chrdev_region(cd->devnum_genwqe, GENWQE_MAX_MINOR);