1 /* ldc.c: Logical Domain Channel link-layer protocol driver.
3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
6 #include <linux/kernel.h>
7 #include <linux/export.h>
8 #include <linux/slab.h>
9 #include <linux/spinlock.h>
10 #include <linux/delay.h>
11 #include <linux/errno.h>
12 #include <linux/string.h>
13 #include <linux/scatterlist.h>
14 #include <linux/interrupt.h>
15 #include <linux/list.h>
16 #include <linux/init.h>
17 #include <linux/bitmap.h>
19 #include <asm/hypervisor.h>
20 #include <asm/iommu.h>
23 #include <asm/mdesc.h>
25 #define DRV_MODULE_NAME "ldc"
26 #define PFX DRV_MODULE_NAME ": "
27 #define DRV_MODULE_VERSION "1.1"
28 #define DRV_MODULE_RELDATE "July 22, 2008"
30 static char version[] __devinitdata =
31 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
32 #define LDC_PACKET_SIZE 64
34 /* Packet header layout for unreliable and reliable mode frames.
35 * When in RAW mode, packets are simply straight 64-byte payloads
50 #define LDC_VERS 0x01 /* Link Version */
51 #define LDC_RTS 0x02 /* Request To Send */
52 #define LDC_RTR 0x03 /* Ready To Receive */
53 #define LDC_RDX 0x04 /* Ready for Data eXchange */
54 #define LDC_CTRL_MSK 0x0f
58 #define LDC_FRAG_MASK 0xc0
59 #define LDC_START 0x40
65 u8 u_data[LDC_PACKET_SIZE - 8];
69 u8 r_data[LDC_PACKET_SIZE - 8 - 8];
79 /* Ordered from largest major to lowest. */
80 static struct ldc_version ver_arr[] = {
81 { .major = 1, .minor = 0 },
84 #define LDC_DEFAULT_MTU (4 * LDC_PACKET_SIZE)
85 #define LDC_DEFAULT_NUM_ENTRIES (PAGE_SIZE / LDC_PACKET_SIZE)
90 int (*write)(struct ldc_channel *, const void *, unsigned int);
91 int (*read)(struct ldc_channel *, void *, unsigned int);
94 static const struct ldc_mode_ops raw_ops;
95 static const struct ldc_mode_ops nonraw_ops;
96 static const struct ldc_mode_ops stream_ops;
98 int ldom_domaining_enabled;
101 /* Protects arena alloc/free. */
103 struct iommu_arena arena;
104 struct ldc_mtable_entry *page_table;
108 /* Protects all operations that depend upon channel state. */
117 struct ldc_packet *tx_base;
118 unsigned long tx_head;
119 unsigned long tx_tail;
120 unsigned long tx_num_entries;
123 unsigned long tx_acked;
125 struct ldc_packet *rx_base;
126 unsigned long rx_head;
127 unsigned long rx_tail;
128 unsigned long rx_num_entries;
134 unsigned long chan_state;
136 struct ldc_channel_config cfg;
139 const struct ldc_mode_ops *mops;
141 struct ldc_iommu iommu;
143 struct ldc_version ver;
146 #define LDC_HS_CLOSED 0x00
147 #define LDC_HS_OPEN 0x01
148 #define LDC_HS_GOTVERS 0x02
149 #define LDC_HS_SENTRTR 0x03
150 #define LDC_HS_GOTRTR 0x04
151 #define LDC_HS_COMPLETE 0x10
154 #define LDC_FLAG_ALLOCED_QUEUES 0x01
155 #define LDC_FLAG_REGISTERED_QUEUES 0x02
156 #define LDC_FLAG_REGISTERED_IRQS 0x04
157 #define LDC_FLAG_RESET 0x10
162 #define LDC_IRQ_NAME_MAX 32
163 char rx_irq_name[LDC_IRQ_NAME_MAX];
164 char tx_irq_name[LDC_IRQ_NAME_MAX];
166 struct hlist_head mh_list;
168 struct hlist_node list;
171 #define ldcdbg(TYPE, f, a...) \
172 do { if (lp->cfg.debug & LDC_DEBUG_##TYPE) \
173 printk(KERN_INFO PFX "ID[%lu] " f, lp->id, ## a); \
176 static const char *state_to_str(u8 state)
179 case LDC_STATE_INVALID:
183 case LDC_STATE_BOUND:
185 case LDC_STATE_READY:
187 case LDC_STATE_CONNECTED:
194 static void ldc_set_state(struct ldc_channel *lp, u8 state)
196 ldcdbg(STATE, "STATE (%s) --> (%s)\n",
197 state_to_str(lp->state),
198 state_to_str(state));
203 static unsigned long __advance(unsigned long off, unsigned long num_entries)
205 off += LDC_PACKET_SIZE;
206 if (off == (num_entries * LDC_PACKET_SIZE))
212 static unsigned long rx_advance(struct ldc_channel *lp, unsigned long off)
214 return __advance(off, lp->rx_num_entries);
217 static unsigned long tx_advance(struct ldc_channel *lp, unsigned long off)
219 return __advance(off, lp->tx_num_entries);
222 static struct ldc_packet *handshake_get_tx_packet(struct ldc_channel *lp,
223 unsigned long *new_tail)
225 struct ldc_packet *p;
228 t = tx_advance(lp, lp->tx_tail);
229 if (t == lp->tx_head)
235 return p + (lp->tx_tail / LDC_PACKET_SIZE);
238 /* When we are in reliable or stream mode, have to track the next packet
239 * we haven't gotten an ACK for in the TX queue using tx_acked. We have
240 * to be careful not to stomp over the queue past that point. During
241 * the handshake, we don't have TX data packets pending in the queue
242 * and that's why handshake_get_tx_packet() need not be mindful of
245 static unsigned long head_for_data(struct ldc_channel *lp)
247 if (lp->cfg.mode == LDC_MODE_STREAM)
252 static int tx_has_space_for(struct ldc_channel *lp, unsigned int size)
254 unsigned long limit, tail, new_tail, diff;
257 limit = head_for_data(lp);
259 new_tail = tx_advance(lp, tail);
260 if (new_tail == limit)
263 if (limit > new_tail)
264 diff = limit - new_tail;
267 ((lp->tx_num_entries * LDC_PACKET_SIZE) - new_tail));
268 diff /= LDC_PACKET_SIZE;
271 if (diff * mss < size)
277 static struct ldc_packet *data_get_tx_packet(struct ldc_channel *lp,
278 unsigned long *new_tail)
280 struct ldc_packet *p;
283 h = head_for_data(lp);
284 t = tx_advance(lp, lp->tx_tail);
291 return p + (lp->tx_tail / LDC_PACKET_SIZE);
294 static int set_tx_tail(struct ldc_channel *lp, unsigned long tail)
296 unsigned long orig_tail = lp->tx_tail;
300 while (limit-- > 0) {
303 err = sun4v_ldc_tx_set_qtail(lp->id, tail);
307 if (err != HV_EWOULDBLOCK) {
308 lp->tx_tail = orig_tail;
314 lp->tx_tail = orig_tail;
318 /* This just updates the head value in the hypervisor using
319 * a polling loop with a timeout. The caller takes care of
320 * upating software state representing the head change, if any.
322 static int __set_rx_head(struct ldc_channel *lp, unsigned long head)
326 while (limit-- > 0) {
329 err = sun4v_ldc_rx_set_qhead(lp->id, head);
333 if (err != HV_EWOULDBLOCK)
342 static int send_tx_packet(struct ldc_channel *lp,
343 struct ldc_packet *p,
344 unsigned long new_tail)
346 BUG_ON(p != (lp->tx_base + (lp->tx_tail / LDC_PACKET_SIZE)));
348 return set_tx_tail(lp, new_tail);
351 static struct ldc_packet *handshake_compose_ctrl(struct ldc_channel *lp,
353 void *data, int dlen,
354 unsigned long *new_tail)
356 struct ldc_packet *p = handshake_get_tx_packet(lp, new_tail);
359 memset(p, 0, sizeof(*p));
364 memcpy(p->u.u_data, data, dlen);
369 static int start_handshake(struct ldc_channel *lp)
371 struct ldc_packet *p;
372 struct ldc_version *ver;
373 unsigned long new_tail;
377 ldcdbg(HS, "SEND VER INFO maj[%u] min[%u]\n",
378 ver->major, ver->minor);
380 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS,
381 ver, sizeof(*ver), &new_tail);
383 int err = send_tx_packet(lp, p, new_tail);
385 lp->flags &= ~LDC_FLAG_RESET;
391 static int send_version_nack(struct ldc_channel *lp,
392 u16 major, u16 minor)
394 struct ldc_packet *p;
395 struct ldc_version ver;
396 unsigned long new_tail;
401 p = handshake_compose_ctrl(lp, LDC_NACK, LDC_VERS,
402 &ver, sizeof(ver), &new_tail);
404 ldcdbg(HS, "SEND VER NACK maj[%u] min[%u]\n",
405 ver.major, ver.minor);
407 return send_tx_packet(lp, p, new_tail);
412 static int send_version_ack(struct ldc_channel *lp,
413 struct ldc_version *vp)
415 struct ldc_packet *p;
416 unsigned long new_tail;
418 p = handshake_compose_ctrl(lp, LDC_ACK, LDC_VERS,
419 vp, sizeof(*vp), &new_tail);
421 ldcdbg(HS, "SEND VER ACK maj[%u] min[%u]\n",
422 vp->major, vp->minor);
424 return send_tx_packet(lp, p, new_tail);
429 static int send_rts(struct ldc_channel *lp)
431 struct ldc_packet *p;
432 unsigned long new_tail;
434 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTS, NULL, 0,
437 p->env = lp->cfg.mode;
441 ldcdbg(HS, "SEND RTS env[0x%x] seqid[0x%x]\n",
444 return send_tx_packet(lp, p, new_tail);
449 static int send_rtr(struct ldc_channel *lp)
451 struct ldc_packet *p;
452 unsigned long new_tail;
454 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTR, NULL, 0,
457 p->env = lp->cfg.mode;
460 ldcdbg(HS, "SEND RTR env[0x%x] seqid[0x%x]\n",
463 return send_tx_packet(lp, p, new_tail);
468 static int send_rdx(struct ldc_channel *lp)
470 struct ldc_packet *p;
471 unsigned long new_tail;
473 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RDX, NULL, 0,
477 p->seqid = ++lp->snd_nxt;
478 p->u.r.ackid = lp->rcv_nxt;
480 ldcdbg(HS, "SEND RDX env[0x%x] seqid[0x%x] ackid[0x%x]\n",
481 p->env, p->seqid, p->u.r.ackid);
483 return send_tx_packet(lp, p, new_tail);
488 static int send_data_nack(struct ldc_channel *lp, struct ldc_packet *data_pkt)
490 struct ldc_packet *p;
491 unsigned long new_tail;
494 p = data_get_tx_packet(lp, &new_tail);
497 memset(p, 0, sizeof(*p));
498 p->type = data_pkt->type;
500 p->ctrl = data_pkt->ctrl & LDC_CTRL_MSK;
501 p->seqid = lp->snd_nxt + 1;
502 p->u.r.ackid = lp->rcv_nxt;
504 ldcdbg(HS, "SEND DATA NACK type[0x%x] ctl[0x%x] seq[0x%x] ack[0x%x]\n",
505 p->type, p->ctrl, p->seqid, p->u.r.ackid);
507 err = send_tx_packet(lp, p, new_tail);
514 static int ldc_abort(struct ldc_channel *lp)
516 unsigned long hv_err;
518 ldcdbg(STATE, "ABORT\n");
520 /* We report but do not act upon the hypervisor errors because
521 * there really isn't much we can do if they fail at this point.
523 hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
525 printk(KERN_ERR PFX "ldc_abort: "
526 "sun4v_ldc_tx_qconf(%lx,%lx,%lx) failed, err=%lu\n",
527 lp->id, lp->tx_ra, lp->tx_num_entries, hv_err);
529 hv_err = sun4v_ldc_tx_get_state(lp->id,
534 printk(KERN_ERR PFX "ldc_abort: "
535 "sun4v_ldc_tx_get_state(%lx,...) failed, err=%lu\n",
538 hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries);
540 printk(KERN_ERR PFX "ldc_abort: "
541 "sun4v_ldc_rx_qconf(%lx,%lx,%lx) failed, err=%lu\n",
542 lp->id, lp->rx_ra, lp->rx_num_entries, hv_err);
544 /* Refetch the RX queue state as well, because we could be invoked
545 * here in the queue processing context.
547 hv_err = sun4v_ldc_rx_get_state(lp->id,
552 printk(KERN_ERR PFX "ldc_abort: "
553 "sun4v_ldc_rx_get_state(%lx,...) failed, err=%lu\n",
559 static struct ldc_version *find_by_major(u16 major)
561 struct ldc_version *ret = NULL;
564 for (i = 0; i < ARRAY_SIZE(ver_arr); i++) {
565 struct ldc_version *v = &ver_arr[i];
566 if (v->major <= major) {
574 static int process_ver_info(struct ldc_channel *lp, struct ldc_version *vp)
576 struct ldc_version *vap;
579 ldcdbg(HS, "GOT VERSION INFO major[%x] minor[%x]\n",
580 vp->major, vp->minor);
582 if (lp->hs_state == LDC_HS_GOTVERS) {
583 lp->hs_state = LDC_HS_OPEN;
584 memset(&lp->ver, 0, sizeof(lp->ver));
587 vap = find_by_major(vp->major);
589 err = send_version_nack(lp, 0, 0);
590 } else if (vap->major != vp->major) {
591 err = send_version_nack(lp, vap->major, vap->minor);
593 struct ldc_version ver = *vp;
594 if (ver.minor > vap->minor)
595 ver.minor = vap->minor;
596 err = send_version_ack(lp, &ver);
599 lp->hs_state = LDC_HS_GOTVERS;
603 return ldc_abort(lp);
608 static int process_ver_ack(struct ldc_channel *lp, struct ldc_version *vp)
610 ldcdbg(HS, "GOT VERSION ACK major[%x] minor[%x]\n",
611 vp->major, vp->minor);
613 if (lp->hs_state == LDC_HS_GOTVERS) {
614 if (lp->ver.major != vp->major ||
615 lp->ver.minor != vp->minor)
616 return ldc_abort(lp);
619 lp->hs_state = LDC_HS_GOTVERS;
622 return ldc_abort(lp);
626 static int process_ver_nack(struct ldc_channel *lp, struct ldc_version *vp)
628 struct ldc_version *vap;
629 struct ldc_packet *p;
630 unsigned long new_tail;
632 if (vp->major == 0 && vp->minor == 0)
633 return ldc_abort(lp);
635 vap = find_by_major(vp->major);
637 return ldc_abort(lp);
639 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS,
643 return ldc_abort(lp);
645 return send_tx_packet(lp, p, new_tail);
648 static int process_version(struct ldc_channel *lp,
649 struct ldc_packet *p)
651 struct ldc_version *vp;
653 vp = (struct ldc_version *) p->u.u_data;
657 return process_ver_info(lp, vp);
660 return process_ver_ack(lp, vp);
663 return process_ver_nack(lp, vp);
666 return ldc_abort(lp);
670 static int process_rts(struct ldc_channel *lp,
671 struct ldc_packet *p)
673 ldcdbg(HS, "GOT RTS stype[%x] seqid[%x] env[%x]\n",
674 p->stype, p->seqid, p->env);
676 if (p->stype != LDC_INFO ||
677 lp->hs_state != LDC_HS_GOTVERS ||
678 p->env != lp->cfg.mode)
679 return ldc_abort(lp);
681 lp->snd_nxt = p->seqid;
682 lp->rcv_nxt = p->seqid;
683 lp->hs_state = LDC_HS_SENTRTR;
685 return ldc_abort(lp);
690 static int process_rtr(struct ldc_channel *lp,
691 struct ldc_packet *p)
693 ldcdbg(HS, "GOT RTR stype[%x] seqid[%x] env[%x]\n",
694 p->stype, p->seqid, p->env);
696 if (p->stype != LDC_INFO ||
697 p->env != lp->cfg.mode)
698 return ldc_abort(lp);
700 lp->snd_nxt = p->seqid;
701 lp->hs_state = LDC_HS_COMPLETE;
702 ldc_set_state(lp, LDC_STATE_CONNECTED);
708 static int rx_seq_ok(struct ldc_channel *lp, u32 seqid)
710 return lp->rcv_nxt + 1 == seqid;
713 static int process_rdx(struct ldc_channel *lp,
714 struct ldc_packet *p)
716 ldcdbg(HS, "GOT RDX stype[%x] seqid[%x] env[%x] ackid[%x]\n",
717 p->stype, p->seqid, p->env, p->u.r.ackid);
719 if (p->stype != LDC_INFO ||
720 !(rx_seq_ok(lp, p->seqid)))
721 return ldc_abort(lp);
723 lp->rcv_nxt = p->seqid;
725 lp->hs_state = LDC_HS_COMPLETE;
726 ldc_set_state(lp, LDC_STATE_CONNECTED);
731 static int process_control_frame(struct ldc_channel *lp,
732 struct ldc_packet *p)
736 return process_version(lp, p);
739 return process_rts(lp, p);
742 return process_rtr(lp, p);
745 return process_rdx(lp, p);
748 return ldc_abort(lp);
752 static int process_error_frame(struct ldc_channel *lp,
753 struct ldc_packet *p)
755 return ldc_abort(lp);
758 static int process_data_ack(struct ldc_channel *lp,
759 struct ldc_packet *ack)
761 unsigned long head = lp->tx_acked;
762 u32 ackid = ack->u.r.ackid;
765 struct ldc_packet *p = lp->tx_base + (head / LDC_PACKET_SIZE);
767 head = tx_advance(lp, head);
769 if (p->seqid == ackid) {
773 if (head == lp->tx_tail)
774 return ldc_abort(lp);
780 static void send_events(struct ldc_channel *lp, unsigned int event_mask)
782 if (event_mask & LDC_EVENT_RESET)
783 lp->cfg.event(lp->event_arg, LDC_EVENT_RESET);
784 if (event_mask & LDC_EVENT_UP)
785 lp->cfg.event(lp->event_arg, LDC_EVENT_UP);
786 if (event_mask & LDC_EVENT_DATA_READY)
787 lp->cfg.event(lp->event_arg, LDC_EVENT_DATA_READY);
790 static irqreturn_t ldc_rx(int irq, void *dev_id)
792 struct ldc_channel *lp = dev_id;
793 unsigned long orig_state, flags;
794 unsigned int event_mask;
796 spin_lock_irqsave(&lp->lock, flags);
798 orig_state = lp->chan_state;
800 /* We should probably check for hypervisor errors here and
801 * reset the LDC channel if we get one.
803 sun4v_ldc_rx_get_state(lp->id,
808 ldcdbg(RX, "RX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n",
809 orig_state, lp->chan_state, lp->rx_head, lp->rx_tail);
813 if (lp->cfg.mode == LDC_MODE_RAW &&
814 lp->chan_state == LDC_CHANNEL_UP) {
815 lp->hs_state = LDC_HS_COMPLETE;
816 ldc_set_state(lp, LDC_STATE_CONNECTED);
818 event_mask |= LDC_EVENT_UP;
820 orig_state = lp->chan_state;
823 /* If we are in reset state, flush the RX queue and ignore
826 if (lp->flags & LDC_FLAG_RESET) {
827 (void) __set_rx_head(lp, lp->rx_tail);
831 /* Once we finish the handshake, we let the ldc_read()
832 * paths do all of the control frame and state management.
833 * Just trigger the callback.
835 if (lp->hs_state == LDC_HS_COMPLETE) {
837 if (lp->chan_state != orig_state) {
838 unsigned int event = LDC_EVENT_RESET;
840 if (lp->chan_state == LDC_CHANNEL_UP)
841 event = LDC_EVENT_UP;
845 if (lp->rx_head != lp->rx_tail)
846 event_mask |= LDC_EVENT_DATA_READY;
851 if (lp->chan_state != orig_state)
854 while (lp->rx_head != lp->rx_tail) {
855 struct ldc_packet *p;
859 p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE);
863 err = process_control_frame(lp, p);
869 event_mask |= LDC_EVENT_DATA_READY;
874 err = process_error_frame(lp, p);
886 new += LDC_PACKET_SIZE;
887 if (new == (lp->rx_num_entries * LDC_PACKET_SIZE))
891 err = __set_rx_head(lp, new);
893 (void) ldc_abort(lp);
896 if (lp->hs_state == LDC_HS_COMPLETE)
897 goto handshake_complete;
901 spin_unlock_irqrestore(&lp->lock, flags);
903 send_events(lp, event_mask);
908 static irqreturn_t ldc_tx(int irq, void *dev_id)
910 struct ldc_channel *lp = dev_id;
911 unsigned long flags, orig_state;
912 unsigned int event_mask = 0;
914 spin_lock_irqsave(&lp->lock, flags);
916 orig_state = lp->chan_state;
918 /* We should probably check for hypervisor errors here and
919 * reset the LDC channel if we get one.
921 sun4v_ldc_tx_get_state(lp->id,
926 ldcdbg(TX, " TX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n",
927 orig_state, lp->chan_state, lp->tx_head, lp->tx_tail);
929 if (lp->cfg.mode == LDC_MODE_RAW &&
930 lp->chan_state == LDC_CHANNEL_UP) {
931 lp->hs_state = LDC_HS_COMPLETE;
932 ldc_set_state(lp, LDC_STATE_CONNECTED);
934 event_mask |= LDC_EVENT_UP;
937 spin_unlock_irqrestore(&lp->lock, flags);
939 send_events(lp, event_mask);
944 /* XXX ldc_alloc() and ldc_free() needs to run under a mutex so
945 * XXX that addition and removal from the ldc_channel_list has
946 * XXX atomicity, otherwise the __ldc_channel_exists() check is
947 * XXX totally pointless as another thread can slip into ldc_alloc()
948 * XXX and add a channel with the same ID. There also needs to be
949 * XXX a spinlock for ldc_channel_list.
951 static HLIST_HEAD(ldc_channel_list);
953 static int __ldc_channel_exists(unsigned long id)
955 struct ldc_channel *lp;
956 struct hlist_node *n;
958 hlist_for_each_entry(lp, n, &ldc_channel_list, list) {
965 static int alloc_queue(const char *name, unsigned long num_entries,
966 struct ldc_packet **base, unsigned long *ra)
968 unsigned long size, order;
971 size = num_entries * LDC_PACKET_SIZE;
972 order = get_order(size);
974 q = (void *) __get_free_pages(GFP_KERNEL, order);
976 printk(KERN_ERR PFX "Alloc of %s queue failed with "
977 "size=%lu order=%lu\n", name, size, order);
981 memset(q, 0, PAGE_SIZE << order);
989 static void free_queue(unsigned long num_entries, struct ldc_packet *q)
991 unsigned long size, order;
996 size = num_entries * LDC_PACKET_SIZE;
997 order = get_order(size);
999 free_pages((unsigned long)q, order);
1002 /* XXX Make this configurable... XXX */
1003 #define LDC_IOTABLE_SIZE (8 * 1024)
1005 static int ldc_iommu_init(struct ldc_channel *lp)
1007 unsigned long sz, num_tsb_entries, tsbsize, order;
1008 struct ldc_iommu *iommu = &lp->iommu;
1009 struct ldc_mtable_entry *table;
1010 unsigned long hv_err;
1013 num_tsb_entries = LDC_IOTABLE_SIZE;
1014 tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry);
1016 spin_lock_init(&iommu->lock);
1018 sz = num_tsb_entries / 8;
1019 sz = (sz + 7UL) & ~7UL;
1020 iommu->arena.map = kzalloc(sz, GFP_KERNEL);
1021 if (!iommu->arena.map) {
1022 printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz);
1026 iommu->arena.limit = num_tsb_entries;
1028 order = get_order(tsbsize);
1030 table = (struct ldc_mtable_entry *)
1031 __get_free_pages(GFP_KERNEL, order);
1034 printk(KERN_ERR PFX "Alloc of MTE table failed, "
1035 "size=%lu order=%lu\n", tsbsize, order);
1039 memset(table, 0, PAGE_SIZE << order);
1041 iommu->page_table = table;
1043 hv_err = sun4v_ldc_set_map_table(lp->id, __pa(table),
1047 goto out_free_table;
1052 free_pages((unsigned long) table, order);
1053 iommu->page_table = NULL;
1056 kfree(iommu->arena.map);
1057 iommu->arena.map = NULL;
1062 static void ldc_iommu_release(struct ldc_channel *lp)
1064 struct ldc_iommu *iommu = &lp->iommu;
1065 unsigned long num_tsb_entries, tsbsize, order;
1067 (void) sun4v_ldc_set_map_table(lp->id, 0, 0);
1069 num_tsb_entries = iommu->arena.limit;
1070 tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry);
1071 order = get_order(tsbsize);
1073 free_pages((unsigned long) iommu->page_table, order);
1074 iommu->page_table = NULL;
1076 kfree(iommu->arena.map);
1077 iommu->arena.map = NULL;
1080 struct ldc_channel *ldc_alloc(unsigned long id,
1081 const struct ldc_channel_config *cfgp,
1084 struct ldc_channel *lp;
1085 const struct ldc_mode_ops *mops;
1086 unsigned long dummy1, dummy2, hv_err;
1091 if (!ldom_domaining_enabled)
1098 switch (cfgp->mode) {
1101 mss = LDC_PACKET_SIZE;
1104 case LDC_MODE_UNRELIABLE:
1106 mss = LDC_PACKET_SIZE - 8;
1109 case LDC_MODE_STREAM:
1111 mss = LDC_PACKET_SIZE - 8 - 8;
1118 if (!cfgp->event || !event_arg || !cfgp->rx_irq || !cfgp->tx_irq)
1121 hv_err = sun4v_ldc_tx_qinfo(id, &dummy1, &dummy2);
1123 if (hv_err == HV_ECHANNEL)
1127 if (__ldc_channel_exists(id))
1132 lp = kzalloc(sizeof(*lp), GFP_KERNEL);
1137 spin_lock_init(&lp->lock);
1141 err = ldc_iommu_init(lp);
1150 lp->cfg.mtu = LDC_DEFAULT_MTU;
1152 if (lp->cfg.mode == LDC_MODE_STREAM) {
1153 mssbuf = kzalloc(lp->cfg.mtu, GFP_KERNEL);
1156 goto out_free_iommu;
1158 lp->mssbuf = mssbuf;
1161 lp->event_arg = event_arg;
1163 /* XXX allow setting via ldc_channel_config to override defaults
1164 * XXX or use some formula based upon mtu
1166 lp->tx_num_entries = LDC_DEFAULT_NUM_ENTRIES;
1167 lp->rx_num_entries = LDC_DEFAULT_NUM_ENTRIES;
1169 err = alloc_queue("TX", lp->tx_num_entries,
1170 &lp->tx_base, &lp->tx_ra);
1172 goto out_free_mssbuf;
1174 err = alloc_queue("RX", lp->rx_num_entries,
1175 &lp->rx_base, &lp->rx_ra);
1179 lp->flags |= LDC_FLAG_ALLOCED_QUEUES;
1181 lp->hs_state = LDC_HS_CLOSED;
1182 ldc_set_state(lp, LDC_STATE_INIT);
1184 INIT_HLIST_NODE(&lp->list);
1185 hlist_add_head(&lp->list, &ldc_channel_list);
1187 INIT_HLIST_HEAD(&lp->mh_list);
1192 free_queue(lp->tx_num_entries, lp->tx_base);
1198 ldc_iommu_release(lp);
1204 return ERR_PTR(err);
1206 EXPORT_SYMBOL(ldc_alloc);
1208 void ldc_free(struct ldc_channel *lp)
1210 if (lp->flags & LDC_FLAG_REGISTERED_IRQS) {
1211 free_irq(lp->cfg.rx_irq, lp);
1212 free_irq(lp->cfg.tx_irq, lp);
1215 if (lp->flags & LDC_FLAG_REGISTERED_QUEUES) {
1216 sun4v_ldc_tx_qconf(lp->id, 0, 0);
1217 sun4v_ldc_rx_qconf(lp->id, 0, 0);
1218 lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES;
1220 if (lp->flags & LDC_FLAG_ALLOCED_QUEUES) {
1221 free_queue(lp->tx_num_entries, lp->tx_base);
1222 free_queue(lp->rx_num_entries, lp->rx_base);
1223 lp->flags &= ~LDC_FLAG_ALLOCED_QUEUES;
1226 hlist_del(&lp->list);
1230 ldc_iommu_release(lp);
1234 EXPORT_SYMBOL(ldc_free);
1236 /* Bind the channel. This registers the LDC queues with
1237 * the hypervisor and puts the channel into a pseudo-listening
1238 * state. This does not initiate a handshake, ldc_connect() does
1241 int ldc_bind(struct ldc_channel *lp, const char *name)
1243 unsigned long hv_err, flags;
1247 (lp->state != LDC_STATE_INIT))
1250 snprintf(lp->rx_irq_name, LDC_IRQ_NAME_MAX, "%s RX", name);
1251 snprintf(lp->tx_irq_name, LDC_IRQ_NAME_MAX, "%s TX", name);
1253 err = request_irq(lp->cfg.rx_irq, ldc_rx, IRQF_DISABLED,
1254 lp->rx_irq_name, lp);
1258 err = request_irq(lp->cfg.tx_irq, ldc_tx, IRQF_DISABLED,
1259 lp->tx_irq_name, lp);
1261 free_irq(lp->cfg.rx_irq, lp);
1266 spin_lock_irqsave(&lp->lock, flags);
1268 enable_irq(lp->cfg.rx_irq);
1269 enable_irq(lp->cfg.tx_irq);
1271 lp->flags |= LDC_FLAG_REGISTERED_IRQS;
1274 hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0);
1278 hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
1282 hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0);
1286 hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries);
1290 lp->flags |= LDC_FLAG_REGISTERED_QUEUES;
1292 hv_err = sun4v_ldc_tx_get_state(lp->id,
1300 lp->tx_acked = lp->tx_head;
1302 lp->hs_state = LDC_HS_OPEN;
1303 ldc_set_state(lp, LDC_STATE_BOUND);
1305 spin_unlock_irqrestore(&lp->lock, flags);
1310 lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES;
1311 sun4v_ldc_rx_qconf(lp->id, 0, 0);
1314 sun4v_ldc_tx_qconf(lp->id, 0, 0);
1317 lp->flags &= ~LDC_FLAG_REGISTERED_IRQS;
1318 free_irq(lp->cfg.tx_irq, lp);
1319 free_irq(lp->cfg.rx_irq, lp);
1321 spin_unlock_irqrestore(&lp->lock, flags);
1325 EXPORT_SYMBOL(ldc_bind);
1327 int ldc_connect(struct ldc_channel *lp)
1329 unsigned long flags;
1332 if (lp->cfg.mode == LDC_MODE_RAW)
1335 spin_lock_irqsave(&lp->lock, flags);
1337 if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) ||
1338 !(lp->flags & LDC_FLAG_REGISTERED_QUEUES) ||
1339 lp->hs_state != LDC_HS_OPEN)
1342 err = start_handshake(lp);
1344 spin_unlock_irqrestore(&lp->lock, flags);
1348 EXPORT_SYMBOL(ldc_connect);
1350 int ldc_disconnect(struct ldc_channel *lp)
1352 unsigned long hv_err, flags;
1355 if (lp->cfg.mode == LDC_MODE_RAW)
1358 if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) ||
1359 !(lp->flags & LDC_FLAG_REGISTERED_QUEUES))
1362 spin_lock_irqsave(&lp->lock, flags);
1365 hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0);
1369 hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
1373 hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0);
1377 hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries);
1381 ldc_set_state(lp, LDC_STATE_BOUND);
1382 lp->hs_state = LDC_HS_OPEN;
1383 lp->flags |= LDC_FLAG_RESET;
1385 spin_unlock_irqrestore(&lp->lock, flags);
1390 sun4v_ldc_tx_qconf(lp->id, 0, 0);
1391 sun4v_ldc_rx_qconf(lp->id, 0, 0);
1392 free_irq(lp->cfg.tx_irq, lp);
1393 free_irq(lp->cfg.rx_irq, lp);
1394 lp->flags &= ~(LDC_FLAG_REGISTERED_IRQS |
1395 LDC_FLAG_REGISTERED_QUEUES);
1396 ldc_set_state(lp, LDC_STATE_INIT);
1398 spin_unlock_irqrestore(&lp->lock, flags);
1402 EXPORT_SYMBOL(ldc_disconnect);
1404 int ldc_state(struct ldc_channel *lp)
1408 EXPORT_SYMBOL(ldc_state);
1410 static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size)
1412 struct ldc_packet *p;
1413 unsigned long new_tail;
1416 if (size > LDC_PACKET_SIZE)
1419 p = data_get_tx_packet(lp, &new_tail);
1423 memcpy(p, buf, size);
1425 err = send_tx_packet(lp, p, new_tail);
1432 static int read_raw(struct ldc_channel *lp, void *buf, unsigned int size)
1434 struct ldc_packet *p;
1435 unsigned long hv_err, new;
1438 if (size < LDC_PACKET_SIZE)
1441 hv_err = sun4v_ldc_rx_get_state(lp->id,
1446 return ldc_abort(lp);
1448 if (lp->chan_state == LDC_CHANNEL_DOWN ||
1449 lp->chan_state == LDC_CHANNEL_RESETTING)
1452 if (lp->rx_head == lp->rx_tail)
1455 p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE);
1456 memcpy(buf, p, LDC_PACKET_SIZE);
1458 new = rx_advance(lp, lp->rx_head);
1461 err = __set_rx_head(lp, new);
1465 err = LDC_PACKET_SIZE;
1470 static const struct ldc_mode_ops raw_ops = {
1475 static int write_nonraw(struct ldc_channel *lp, const void *buf,
1478 unsigned long hv_err, tail;
1479 unsigned int copied;
1483 hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail,
1485 if (unlikely(hv_err))
1488 if (unlikely(lp->chan_state != LDC_CHANNEL_UP))
1489 return ldc_abort(lp);
1491 if (!tx_has_space_for(lp, size))
1497 while (copied < size) {
1498 struct ldc_packet *p = lp->tx_base + (tail / LDC_PACKET_SIZE);
1499 u8 *data = ((lp->cfg.mode == LDC_MODE_UNRELIABLE) ?
1505 p->stype = LDC_INFO;
1508 data_len = size - copied;
1509 if (data_len > lp->mss)
1512 BUG_ON(data_len > LDC_LEN);
1514 p->env = (data_len |
1515 (copied == 0 ? LDC_START : 0) |
1516 (data_len == size - copied ? LDC_STOP : 0));
1520 ldcdbg(DATA, "SENT DATA [%02x:%02x:%02x:%02x:%08x]\n",
1527 memcpy(data, buf, data_len);
1531 tail = tx_advance(lp, tail);
1534 err = set_tx_tail(lp, tail);
1543 static int rx_bad_seq(struct ldc_channel *lp, struct ldc_packet *p,
1544 struct ldc_packet *first_frag)
1549 lp->rcv_nxt = first_frag->seqid - 1;
1551 err = send_data_nack(lp, p);
1555 err = __set_rx_head(lp, lp->rx_tail);
1557 return ldc_abort(lp);
1562 static int data_ack_nack(struct ldc_channel *lp, struct ldc_packet *p)
1564 if (p->stype & LDC_ACK) {
1565 int err = process_data_ack(lp, p);
1569 if (p->stype & LDC_NACK)
1570 return ldc_abort(lp);
1575 static int rx_data_wait(struct ldc_channel *lp, unsigned long cur_head)
1577 unsigned long dummy;
1580 ldcdbg(DATA, "DATA WAIT cur_head[%lx] rx_head[%lx] rx_tail[%lx]\n",
1581 cur_head, lp->rx_head, lp->rx_tail);
1582 while (limit-- > 0) {
1583 unsigned long hv_err;
1585 hv_err = sun4v_ldc_rx_get_state(lp->id,
1590 return ldc_abort(lp);
1592 if (lp->chan_state == LDC_CHANNEL_DOWN ||
1593 lp->chan_state == LDC_CHANNEL_RESETTING)
1596 if (cur_head != lp->rx_tail) {
1597 ldcdbg(DATA, "DATA WAIT DONE "
1598 "head[%lx] tail[%lx] chan_state[%lx]\n",
1599 dummy, lp->rx_tail, lp->chan_state);
1608 static int rx_set_head(struct ldc_channel *lp, unsigned long head)
1610 int err = __set_rx_head(lp, head);
1613 return ldc_abort(lp);
1619 static void send_data_ack(struct ldc_channel *lp)
1621 unsigned long new_tail;
1622 struct ldc_packet *p;
1624 p = data_get_tx_packet(lp, &new_tail);
1628 memset(p, 0, sizeof(*p));
1632 p->seqid = lp->snd_nxt + 1;
1633 p->u.r.ackid = lp->rcv_nxt;
1635 err = send_tx_packet(lp, p, new_tail);
1641 static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size)
1643 struct ldc_packet *first_frag;
1644 unsigned long hv_err, new;
1647 hv_err = sun4v_ldc_rx_get_state(lp->id,
1652 return ldc_abort(lp);
1654 if (lp->chan_state == LDC_CHANNEL_DOWN ||
1655 lp->chan_state == LDC_CHANNEL_RESETTING)
1658 if (lp->rx_head == lp->rx_tail)
1665 struct ldc_packet *p;
1668 BUG_ON(new == lp->rx_tail);
1669 p = lp->rx_base + (new / LDC_PACKET_SIZE);
1671 ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] "
1681 if (unlikely(!rx_seq_ok(lp, p->seqid))) {
1682 err = rx_bad_seq(lp, p, first_frag);
1687 if (p->type & LDC_CTRL) {
1688 err = process_control_frame(lp, p);
1694 lp->rcv_nxt = p->seqid;
1696 if (!(p->type & LDC_DATA)) {
1697 new = rx_advance(lp, new);
1700 if (p->stype & (LDC_ACK | LDC_NACK)) {
1701 err = data_ack_nack(lp, p);
1705 if (!(p->stype & LDC_INFO)) {
1706 new = rx_advance(lp, new);
1707 err = rx_set_head(lp, new);
1713 pkt_len = p->env & LDC_LEN;
1715 /* Every initial packet starts with the START bit set.
1717 * Singleton packets will have both START+STOP set.
1719 * Fragments will have START set in the first frame, STOP
1720 * set in the last frame, and neither bit set in middle
1721 * frames of the packet.
1723 * Therefore if we are at the beginning of a packet and
1724 * we don't see START, or we are in the middle of a fragmented
1725 * packet and do see START, we are unsynchronized and should
1726 * flush the RX queue.
1728 if ((first_frag == NULL && !(p->env & LDC_START)) ||
1729 (first_frag != NULL && (p->env & LDC_START))) {
1731 new = rx_advance(lp, new);
1733 err = rx_set_head(lp, new);
1743 if (pkt_len > size - copied) {
1744 /* User didn't give us a big enough buffer,
1745 * what to do? This is a pretty serious error.
1747 * Since we haven't updated the RX ring head to
1748 * consume any of the packets, signal the error
1749 * to the user and just leave the RX ring alone.
1751 * This seems the best behavior because this allows
1752 * a user of the LDC layer to start with a small
1753 * RX buffer for ldc_read() calls and use -EMSGSIZE
1754 * as a cue to enlarge it's read buffer.
1760 /* Ok, we are gonna eat this one. */
1761 new = rx_advance(lp, new);
1764 (lp->cfg.mode == LDC_MODE_UNRELIABLE ?
1765 p->u.u_data : p->u.r.r_data), pkt_len);
1769 if (p->env & LDC_STOP)
1773 if (new == lp->rx_tail) {
1774 err = rx_data_wait(lp, new);
1781 err = rx_set_head(lp, new);
1783 if (err && first_frag)
1784 lp->rcv_nxt = first_frag->seqid - 1;
1788 if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE)
1795 static const struct ldc_mode_ops nonraw_ops = {
1796 .write = write_nonraw,
1797 .read = read_nonraw,
1800 static int write_stream(struct ldc_channel *lp, const void *buf,
1803 if (size > lp->cfg.mtu)
1805 return write_nonraw(lp, buf, size);
1808 static int read_stream(struct ldc_channel *lp, void *buf, unsigned int size)
1810 if (!lp->mssbuf_len) {
1811 int err = read_nonraw(lp, lp->mssbuf, lp->cfg.mtu);
1815 lp->mssbuf_len = err;
1819 if (size > lp->mssbuf_len)
1820 size = lp->mssbuf_len;
1821 memcpy(buf, lp->mssbuf + lp->mssbuf_off, size);
1823 lp->mssbuf_off += size;
1824 lp->mssbuf_len -= size;
1829 static const struct ldc_mode_ops stream_ops = {
1830 .write = write_stream,
1831 .read = read_stream,
1834 int ldc_write(struct ldc_channel *lp, const void *buf, unsigned int size)
1836 unsigned long flags;
1845 spin_lock_irqsave(&lp->lock, flags);
1847 if (lp->hs_state != LDC_HS_COMPLETE)
1850 err = lp->mops->write(lp, buf, size);
1852 spin_unlock_irqrestore(&lp->lock, flags);
1856 EXPORT_SYMBOL(ldc_write);
1858 int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size)
1860 unsigned long flags;
1869 spin_lock_irqsave(&lp->lock, flags);
1871 if (lp->hs_state != LDC_HS_COMPLETE)
1874 err = lp->mops->read(lp, buf, size);
1876 spin_unlock_irqrestore(&lp->lock, flags);
1880 EXPORT_SYMBOL(ldc_read);
1882 static long arena_alloc(struct ldc_iommu *iommu, unsigned long npages)
1884 struct iommu_arena *arena = &iommu->arena;
1885 unsigned long n, start, end, limit;
1888 limit = arena->limit;
1889 start = arena->hint;
1893 n = bitmap_find_next_zero_area(arena->map, limit, start, npages, 0);
1895 if (unlikely(end >= limit)) {
1896 if (likely(pass < 1)) {
1902 /* Scanned the whole thing, give up. */
1906 bitmap_set(arena->map, n, npages);
1913 #define COOKIE_PGSZ_CODE 0xf000000000000000ULL
1914 #define COOKIE_PGSZ_CODE_SHIFT 60ULL
1916 static u64 pagesize_code(void)
1918 switch (PAGE_SIZE) {
1920 case (8ULL * 1024ULL):
1922 case (64ULL * 1024ULL):
1924 case (512ULL * 1024ULL):
1926 case (4ULL * 1024ULL * 1024ULL):
1928 case (32ULL * 1024ULL * 1024ULL):
1930 case (256ULL * 1024ULL * 1024ULL):
1935 static u64 make_cookie(u64 index, u64 pgsz_code, u64 page_offset)
1937 return ((pgsz_code << COOKIE_PGSZ_CODE_SHIFT) |
1938 (index << PAGE_SHIFT) |
1942 static u64 cookie_to_index(u64 cookie, unsigned long *shift)
1944 u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT;
1946 cookie &= ~COOKIE_PGSZ_CODE;
1948 *shift = szcode * 3;
1950 return (cookie >> (13ULL + (szcode * 3ULL)));
1953 static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu,
1954 unsigned long npages)
1958 entry = arena_alloc(iommu, npages);
1959 if (unlikely(entry < 0))
1962 return iommu->page_table + entry;
1965 static u64 perm_to_mte(unsigned int map_perm)
1969 mte_base = pagesize_code();
1971 if (map_perm & LDC_MAP_SHADOW) {
1972 if (map_perm & LDC_MAP_R)
1973 mte_base |= LDC_MTE_COPY_R;
1974 if (map_perm & LDC_MAP_W)
1975 mte_base |= LDC_MTE_COPY_W;
1977 if (map_perm & LDC_MAP_DIRECT) {
1978 if (map_perm & LDC_MAP_R)
1979 mte_base |= LDC_MTE_READ;
1980 if (map_perm & LDC_MAP_W)
1981 mte_base |= LDC_MTE_WRITE;
1982 if (map_perm & LDC_MAP_X)
1983 mte_base |= LDC_MTE_EXEC;
1985 if (map_perm & LDC_MAP_IO) {
1986 if (map_perm & LDC_MAP_R)
1987 mte_base |= LDC_MTE_IOMMU_R;
1988 if (map_perm & LDC_MAP_W)
1989 mte_base |= LDC_MTE_IOMMU_W;
1995 static int pages_in_region(unsigned long base, long len)
2000 unsigned long new = (base + PAGE_SIZE) & PAGE_MASK;
2002 len -= (new - base);
2010 struct cookie_state {
2011 struct ldc_mtable_entry *page_table;
2012 struct ldc_trans_cookie *cookies;
2019 static void fill_cookies(struct cookie_state *sp, unsigned long pa,
2020 unsigned long off, unsigned long len)
2023 unsigned long tlen, new = pa + PAGE_SIZE;
2026 sp->page_table[sp->pte_idx].mte = sp->mte_base | pa;
2030 tlen = PAGE_SIZE - off;
2034 this_cookie = make_cookie(sp->pte_idx,
2035 pagesize_code(), off);
2039 if (this_cookie == sp->prev_cookie) {
2040 sp->cookies[sp->nc - 1].cookie_size += tlen;
2042 sp->cookies[sp->nc].cookie_addr = this_cookie;
2043 sp->cookies[sp->nc].cookie_size = tlen;
2046 sp->prev_cookie = this_cookie + tlen;
2055 static int sg_count_one(struct scatterlist *sg)
2057 unsigned long base = page_to_pfn(sg_page(sg)) << PAGE_SHIFT;
2058 long len = sg->length;
2060 if ((sg->offset | len) & (8UL - 1))
2063 return pages_in_region(base + sg->offset, len);
2066 static int sg_count_pages(struct scatterlist *sg, int num_sg)
2072 for (i = 0; i < num_sg; i++) {
2073 int err = sg_count_one(sg + i);
2082 int ldc_map_sg(struct ldc_channel *lp,
2083 struct scatterlist *sg, int num_sg,
2084 struct ldc_trans_cookie *cookies, int ncookies,
2085 unsigned int map_perm)
2087 unsigned long i, npages, flags;
2088 struct ldc_mtable_entry *base;
2089 struct cookie_state state;
2090 struct ldc_iommu *iommu;
2093 if (map_perm & ~LDC_MAP_ALL)
2096 err = sg_count_pages(sg, num_sg);
2106 spin_lock_irqsave(&iommu->lock, flags);
2107 base = alloc_npages(iommu, npages);
2108 spin_unlock_irqrestore(&iommu->lock, flags);
2113 state.page_table = iommu->page_table;
2114 state.cookies = cookies;
2115 state.mte_base = perm_to_mte(map_perm);
2116 state.prev_cookie = ~(u64)0;
2117 state.pte_idx = (base - iommu->page_table);
2120 for (i = 0; i < num_sg; i++)
2121 fill_cookies(&state, page_to_pfn(sg_page(&sg[i])) << PAGE_SHIFT,
2122 sg[i].offset, sg[i].length);
2126 EXPORT_SYMBOL(ldc_map_sg);
2128 int ldc_map_single(struct ldc_channel *lp,
2129 void *buf, unsigned int len,
2130 struct ldc_trans_cookie *cookies, int ncookies,
2131 unsigned int map_perm)
2133 unsigned long npages, pa, flags;
2134 struct ldc_mtable_entry *base;
2135 struct cookie_state state;
2136 struct ldc_iommu *iommu;
2138 if ((map_perm & ~LDC_MAP_ALL) || (ncookies < 1))
2142 if ((pa | len) & (8UL - 1))
2145 npages = pages_in_region(pa, len);
2149 spin_lock_irqsave(&iommu->lock, flags);
2150 base = alloc_npages(iommu, npages);
2151 spin_unlock_irqrestore(&iommu->lock, flags);
2156 state.page_table = iommu->page_table;
2157 state.cookies = cookies;
2158 state.mte_base = perm_to_mte(map_perm);
2159 state.prev_cookie = ~(u64)0;
2160 state.pte_idx = (base - iommu->page_table);
2162 fill_cookies(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len);
2163 BUG_ON(state.nc != 1);
2167 EXPORT_SYMBOL(ldc_map_single);
2169 static void free_npages(unsigned long id, struct ldc_iommu *iommu,
2170 u64 cookie, u64 size)
2172 struct iommu_arena *arena = &iommu->arena;
2173 unsigned long i, shift, index, npages;
2174 struct ldc_mtable_entry *base;
2176 npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT;
2177 index = cookie_to_index(cookie, &shift);
2178 base = iommu->page_table + index;
2180 BUG_ON(index > arena->limit ||
2181 (index + npages) > arena->limit);
2183 for (i = 0; i < npages; i++) {
2185 sun4v_ldc_revoke(id, cookie + (i << shift),
2188 __clear_bit(index + i, arena->map);
2192 void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies,
2195 struct ldc_iommu *iommu = &lp->iommu;
2196 unsigned long flags;
2199 spin_lock_irqsave(&iommu->lock, flags);
2200 for (i = 0; i < ncookies; i++) {
2201 u64 addr = cookies[i].cookie_addr;
2202 u64 size = cookies[i].cookie_size;
2204 free_npages(lp->id, iommu, addr, size);
2206 spin_unlock_irqrestore(&iommu->lock, flags);
2208 EXPORT_SYMBOL(ldc_unmap);
2210 int ldc_copy(struct ldc_channel *lp, int copy_dir,
2211 void *buf, unsigned int len, unsigned long offset,
2212 struct ldc_trans_cookie *cookies, int ncookies)
2214 unsigned int orig_len;
2218 if (copy_dir != LDC_COPY_IN && copy_dir != LDC_COPY_OUT) {
2219 printk(KERN_ERR PFX "ldc_copy: ID[%lu] Bad copy_dir[%d]\n",
2225 if ((ra | len | offset) & (8UL - 1)) {
2226 printk(KERN_ERR PFX "ldc_copy: ID[%lu] Unaligned buffer "
2227 "ra[%lx] len[%x] offset[%lx]\n",
2228 lp->id, ra, len, offset);
2232 if (lp->hs_state != LDC_HS_COMPLETE ||
2233 (lp->flags & LDC_FLAG_RESET)) {
2234 printk(KERN_ERR PFX "ldc_copy: ID[%lu] Link down hs_state[%x] "
2235 "flags[%x]\n", lp->id, lp->hs_state, lp->flags);
2240 for (i = 0; i < ncookies; i++) {
2241 unsigned long cookie_raddr = cookies[i].cookie_addr;
2242 unsigned long this_len = cookies[i].cookie_size;
2243 unsigned long actual_len;
2245 if (unlikely(offset)) {
2246 unsigned long this_off = offset;
2248 if (this_off > this_len)
2249 this_off = this_len;
2252 this_len -= this_off;
2255 cookie_raddr += this_off;
2262 unsigned long hv_err;
2264 hv_err = sun4v_ldc_copy(lp->id, copy_dir,
2266 this_len, &actual_len);
2267 if (unlikely(hv_err)) {
2268 printk(KERN_ERR PFX "ldc_copy: ID[%lu] "
2271 if (lp->hs_state != LDC_HS_COMPLETE ||
2272 (lp->flags & LDC_FLAG_RESET))
2278 cookie_raddr += actual_len;
2281 if (actual_len == this_len)
2284 this_len -= actual_len;
2291 /* It is caller policy what to do about short copies.
2292 * For example, a networking driver can declare the
2293 * packet a runt and drop it.
2296 return orig_len - len;
2298 EXPORT_SYMBOL(ldc_copy);
2300 void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len,
2301 struct ldc_trans_cookie *cookies, int *ncookies,
2302 unsigned int map_perm)
2307 if (len & (8UL - 1))
2308 return ERR_PTR(-EINVAL);
2310 buf = kzalloc(len, GFP_KERNEL);
2312 return ERR_PTR(-ENOMEM);
2314 err = ldc_map_single(lp, buf, len, cookies, *ncookies, map_perm);
2317 return ERR_PTR(err);
2323 EXPORT_SYMBOL(ldc_alloc_exp_dring);
2325 void ldc_free_exp_dring(struct ldc_channel *lp, void *buf, unsigned int len,
2326 struct ldc_trans_cookie *cookies, int ncookies)
2328 ldc_unmap(lp, cookies, ncookies);
2331 EXPORT_SYMBOL(ldc_free_exp_dring);
2333 static int __init ldc_init(void)
2335 unsigned long major, minor;
2336 struct mdesc_handle *hp;
2345 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
2347 if (mp == MDESC_NODE_NULL)
2350 v = mdesc_get_property(hp, mp, "domaining-enabled", NULL);
2356 if (sun4v_hvapi_register(HV_GRP_LDOM, major, &minor)) {
2357 printk(KERN_INFO PFX "Could not register LDOM hvapi.\n");
2361 printk(KERN_INFO "%s", version);
2364 printk(KERN_INFO PFX "Domaining disabled.\n");
2367 ldom_domaining_enabled = 1;
2375 core_initcall(ldc_init);