aboutsummaryrefslogtreecommitdiff
path: root/arch/sparc64/kernel/ldc.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc64/kernel/ldc.c')
-rw-r--r--arch/sparc64/kernel/ldc.c2378
1 files changed, 0 insertions, 2378 deletions
diff --git a/arch/sparc64/kernel/ldc.c b/arch/sparc64/kernel/ldc.c
deleted file mode 100644
index d68982330f6..00000000000
--- a/arch/sparc64/kernel/ldc.c
+++ /dev/null
@@ -1,2378 +0,0 @@
-/* ldc.c: Logical Domain Channel link-layer protocol driver.
- *
- * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/scatterlist.h>
-#include <linux/interrupt.h>
-#include <linux/list.h>
-#include <linux/init.h>
-
-#include <asm/hypervisor.h>
-#include <asm/iommu.h>
-#include <asm/page.h>
-#include <asm/ldc.h>
-#include <asm/mdesc.h>
-
-#define DRV_MODULE_NAME "ldc"
-#define PFX DRV_MODULE_NAME ": "
-#define DRV_MODULE_VERSION "1.1"
-#define DRV_MODULE_RELDATE "July 22, 2008"
-
-static char version[] __devinitdata =
- DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
-#define LDC_PACKET_SIZE 64
-
-/* Packet header layout for unreliable and reliable mode frames.
- * When in RAW mode, packets are simply straight 64-byte payloads
- * with no headers.
- */
-struct ldc_packet {
- u8 type;
-#define LDC_CTRL 0x01
-#define LDC_DATA 0x02
-#define LDC_ERR 0x10
-
- u8 stype;
-#define LDC_INFO 0x01
-#define LDC_ACK 0x02
-#define LDC_NACK 0x04
-
- u8 ctrl;
-#define LDC_VERS 0x01 /* Link Version */
-#define LDC_RTS 0x02 /* Request To Send */
-#define LDC_RTR 0x03 /* Ready To Receive */
-#define LDC_RDX 0x04 /* Ready for Data eXchange */
-#define LDC_CTRL_MSK 0x0f
-
- u8 env;
-#define LDC_LEN 0x3f
-#define LDC_FRAG_MASK 0xc0
-#define LDC_START 0x40
-#define LDC_STOP 0x80
-
- u32 seqid;
-
- union {
- u8 u_data[LDC_PACKET_SIZE - 8];
- struct {
- u32 pad;
- u32 ackid;
- u8 r_data[LDC_PACKET_SIZE - 8 - 8];
- } r;
- } u;
-};
-
-struct ldc_version {
- u16 major;
- u16 minor;
-};
-
-/* Ordered from largest major to lowest. */
-static struct ldc_version ver_arr[] = {
- { .major = 1, .minor = 0 },
-};
-
-#define LDC_DEFAULT_MTU (4 * LDC_PACKET_SIZE)
-#define LDC_DEFAULT_NUM_ENTRIES (PAGE_SIZE / LDC_PACKET_SIZE)
-
-struct ldc_channel;
-
-struct ldc_mode_ops {
- int (*write)(struct ldc_channel *, const void *, unsigned int);
- int (*read)(struct ldc_channel *, void *, unsigned int);
-};
-
-static const struct ldc_mode_ops raw_ops;
-static const struct ldc_mode_ops nonraw_ops;
-static const struct ldc_mode_ops stream_ops;
-
-int ldom_domaining_enabled;
-
-struct ldc_iommu {
- /* Protects arena alloc/free. */
- spinlock_t lock;
- struct iommu_arena arena;
- struct ldc_mtable_entry *page_table;
-};
-
-struct ldc_channel {
- /* Protects all operations that depend upon channel state. */
- spinlock_t lock;
-
- unsigned long id;
-
- u8 *mssbuf;
- u32 mssbuf_len;
- u32 mssbuf_off;
-
- struct ldc_packet *tx_base;
- unsigned long tx_head;
- unsigned long tx_tail;
- unsigned long tx_num_entries;
- unsigned long tx_ra;
-
- unsigned long tx_acked;
-
- struct ldc_packet *rx_base;
- unsigned long rx_head;
- unsigned long rx_tail;
- unsigned long rx_num_entries;
- unsigned long rx_ra;
-
- u32 rcv_nxt;
- u32 snd_nxt;
-
- unsigned long chan_state;
-
- struct ldc_channel_config cfg;
- void *event_arg;
-
- const struct ldc_mode_ops *mops;
-
- struct ldc_iommu iommu;
-
- struct ldc_version ver;
-
- u8 hs_state;
-#define LDC_HS_CLOSED 0x00
-#define LDC_HS_OPEN 0x01
-#define LDC_HS_GOTVERS 0x02
-#define LDC_HS_SENTRTR 0x03
-#define LDC_HS_GOTRTR 0x04
-#define LDC_HS_COMPLETE 0x10
-
- u8 flags;
-#define LDC_FLAG_ALLOCED_QUEUES 0x01
-#define LDC_FLAG_REGISTERED_QUEUES 0x02
-#define LDC_FLAG_REGISTERED_IRQS 0x04
-#define LDC_FLAG_RESET 0x10
-
- u8 mss;
- u8 state;
-
-#define LDC_IRQ_NAME_MAX 32
- char rx_irq_name[LDC_IRQ_NAME_MAX];
- char tx_irq_name[LDC_IRQ_NAME_MAX];
-
- struct hlist_head mh_list;
-
- struct hlist_node list;
-};
-
-#define ldcdbg(TYPE, f, a...) \
-do { if (lp->cfg.debug & LDC_DEBUG_##TYPE) \
- printk(KERN_INFO PFX "ID[%lu] " f, lp->id, ## a); \
-} while (0)
-
-static const char *state_to_str(u8 state)
-{
- switch (state) {
- case LDC_STATE_INVALID:
- return "INVALID";
- case LDC_STATE_INIT:
- return "INIT";
- case LDC_STATE_BOUND:
- return "BOUND";
- case LDC_STATE_READY:
- return "READY";
- case LDC_STATE_CONNECTED:
- return "CONNECTED";
- default:
- return "<UNKNOWN>";
- }
-}
-
-static void ldc_set_state(struct ldc_channel *lp, u8 state)
-{
- ldcdbg(STATE, "STATE (%s) --> (%s)\n",
- state_to_str(lp->state),
- state_to_str(state));
-
- lp->state = state;
-}
-
-static unsigned long __advance(unsigned long off, unsigned long num_entries)
-{
- off += LDC_PACKET_SIZE;
- if (off == (num_entries * LDC_PACKET_SIZE))
- off = 0;
-
- return off;
-}
-
-static unsigned long rx_advance(struct ldc_channel *lp, unsigned long off)
-{
- return __advance(off, lp->rx_num_entries);
-}
-
-static unsigned long tx_advance(struct ldc_channel *lp, unsigned long off)
-{
- return __advance(off, lp->tx_num_entries);
-}
-
-static struct ldc_packet *handshake_get_tx_packet(struct ldc_channel *lp,
- unsigned long *new_tail)
-{
- struct ldc_packet *p;
- unsigned long t;
-
- t = tx_advance(lp, lp->tx_tail);
- if (t == lp->tx_head)
- return NULL;
-
- *new_tail = t;
-
- p = lp->tx_base;
- return p + (lp->tx_tail / LDC_PACKET_SIZE);
-}
-
-/* When we are in reliable or stream mode, have to track the next packet
- * we haven't gotten an ACK for in the TX queue using tx_acked. We have
- * to be careful not to stomp over the queue past that point. During
- * the handshake, we don't have TX data packets pending in the queue
- * and that's why handshake_get_tx_packet() need not be mindful of
- * lp->tx_acked.
- */
-static unsigned long head_for_data(struct ldc_channel *lp)
-{
- if (lp->cfg.mode == LDC_MODE_STREAM)
- return lp->tx_acked;
- return lp->tx_head;
-}
-
-static int tx_has_space_for(struct ldc_channel *lp, unsigned int size)
-{
- unsigned long limit, tail, new_tail, diff;
- unsigned int mss;
-
- limit = head_for_data(lp);
- tail = lp->tx_tail;
- new_tail = tx_advance(lp, tail);
- if (new_tail == limit)
- return 0;
-
- if (limit > new_tail)
- diff = limit - new_tail;
- else
- diff = (limit +
- ((lp->tx_num_entries * LDC_PACKET_SIZE) - new_tail));
- diff /= LDC_PACKET_SIZE;
- mss = lp->mss;
-
- if (diff * mss < size)
- return 0;
-
- return 1;
-}
-
-static struct ldc_packet *data_get_tx_packet(struct ldc_channel *lp,
- unsigned long *new_tail)
-{
- struct ldc_packet *p;
- unsigned long h, t;
-
- h = head_for_data(lp);
- t = tx_advance(lp, lp->tx_tail);
- if (t == h)
- return NULL;
-
- *new_tail = t;
-
- p = lp->tx_base;
- return p + (lp->tx_tail / LDC_PACKET_SIZE);
-}
-
-static int set_tx_tail(struct ldc_channel *lp, unsigned long tail)
-{
- unsigned long orig_tail = lp->tx_tail;
- int limit = 1000;
-
- lp->tx_tail = tail;
- while (limit-- > 0) {
- unsigned long err;
-
- err = sun4v_ldc_tx_set_qtail(lp->id, tail);
- if (!err)
- return 0;
-
- if (err != HV_EWOULDBLOCK) {
- lp->tx_tail = orig_tail;
- return -EINVAL;
- }
- udelay(1);
- }
-
- lp->tx_tail = orig_tail;
- return -EBUSY;
-}
-
-/* This just updates the head value in the hypervisor using
- * a polling loop with a timeout. The caller takes care of
- * upating software state representing the head change, if any.
- */
-static int __set_rx_head(struct ldc_channel *lp, unsigned long head)
-{
- int limit = 1000;
-
- while (limit-- > 0) {
- unsigned long err;
-
- err = sun4v_ldc_rx_set_qhead(lp->id, head);
- if (!err)
- return 0;
-
- if (err != HV_EWOULDBLOCK)
- return -EINVAL;
-
- udelay(1);
- }
-
- return -EBUSY;
-}
-
-static int send_tx_packet(struct ldc_channel *lp,
- struct ldc_packet *p,
- unsigned long new_tail)
-{
- BUG_ON(p != (lp->tx_base + (lp->tx_tail / LDC_PACKET_SIZE)));
-
- return set_tx_tail(lp, new_tail);
-}
-
-static struct ldc_packet *handshake_compose_ctrl(struct ldc_channel *lp,
- u8 stype, u8 ctrl,
- void *data, int dlen,
- unsigned long *new_tail)
-{
- struct ldc_packet *p = handshake_get_tx_packet(lp, new_tail);
-
- if (p) {
- memset(p, 0, sizeof(*p));
- p->type = LDC_CTRL;
- p->stype = stype;
- p->ctrl = ctrl;
- if (data)
- memcpy(p->u.u_data, data, dlen);
- }
- return p;
-}
-
-static int start_handshake(struct ldc_channel *lp)
-{
- struct ldc_packet *p;
- struct ldc_version *ver;
- unsigned long new_tail;
-
- ver = &ver_arr[0];
-
- ldcdbg(HS, "SEND VER INFO maj[%u] min[%u]\n",
- ver->major, ver->minor);
-
- p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS,
- ver, sizeof(*ver), &new_tail);
- if (p) {
- int err = send_tx_packet(lp, p, new_tail);
- if (!err)
- lp->flags &= ~LDC_FLAG_RESET;
- return err;
- }
- return -EBUSY;
-}
-
-static int send_version_nack(struct ldc_channel *lp,
- u16 major, u16 minor)
-{
- struct ldc_packet *p;
- struct ldc_version ver;
- unsigned long new_tail;
-
- ver.major = major;
- ver.minor = minor;
-
- p = handshake_compose_ctrl(lp, LDC_NACK, LDC_VERS,
- &ver, sizeof(ver), &new_tail);
- if (p) {
- ldcdbg(HS, "SEND VER NACK maj[%u] min[%u]\n",
- ver.major, ver.minor);
-
- return send_tx_packet(lp, p, new_tail);
- }
- return -EBUSY;
-}
-
-static int send_version_ack(struct ldc_channel *lp,
- struct ldc_version *vp)
-{
- struct ldc_packet *p;
- unsigned long new_tail;
-
- p = handshake_compose_ctrl(lp, LDC_ACK, LDC_VERS,
- vp, sizeof(*vp), &new_tail);
- if (p) {
- ldcdbg(HS, "SEND VER ACK maj[%u] min[%u]\n",
- vp->major, vp->minor);
-
- return send_tx_packet(lp, p, new_tail);
- }
- return -EBUSY;
-}
-
-static int send_rts(struct ldc_channel *lp)
-{
- struct ldc_packet *p;
- unsigned long new_tail;
-
- p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTS, NULL, 0,
- &new_tail);
- if (p) {
- p->env = lp->cfg.mode;
- p->seqid = 0;
- lp->rcv_nxt = 0;
-
- ldcdbg(HS, "SEND RTS env[0x%x] seqid[0x%x]\n",
- p->env, p->seqid);
-
- return send_tx_packet(lp, p, new_tail);
- }
- return -EBUSY;
-}
-
-static int send_rtr(struct ldc_channel *lp)
-{
- struct ldc_packet *p;
- unsigned long new_tail;
-
- p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTR, NULL, 0,
- &new_tail);
- if (p) {
- p->env = lp->cfg.mode;
- p->seqid = 0;
-
- ldcdbg(HS, "SEND RTR env[0x%x] seqid[0x%x]\n",
- p->env, p->seqid);
-
- return send_tx_packet(lp, p, new_tail);
- }
- return -EBUSY;
-}
-
-static int send_rdx(struct ldc_channel *lp)
-{
- struct ldc_packet *p;
- unsigned long new_tail;
-
- p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RDX, NULL, 0,
- &new_tail);
- if (p) {
- p->env = 0;
- p->seqid = ++lp->snd_nxt;
- p->u.r.ackid = lp->rcv_nxt;
-
- ldcdbg(HS, "SEND RDX env[0x%x] seqid[0x%x] ackid[0x%x]\n",
- p->env, p->seqid, p->u.r.ackid);
-
- return send_tx_packet(lp, p, new_tail);
- }
- return -EBUSY;
-}
-
-static int send_data_nack(struct ldc_channel *lp, struct ldc_packet *data_pkt)
-{
- struct ldc_packet *p;
- unsigned long new_tail;
- int err;
-
- p = data_get_tx_packet(lp, &new_tail);
- if (!p)
- return -EBUSY;
- memset(p, 0, sizeof(*p));
- p->type = data_pkt->type;
- p->stype = LDC_NACK;
- p->ctrl = data_pkt->ctrl & LDC_CTRL_MSK;
- p->seqid = lp->snd_nxt + 1;
- p->u.r.ackid = lp->rcv_nxt;
-
- ldcdbg(HS, "SEND DATA NACK type[0x%x] ctl[0x%x] seq[0x%x] ack[0x%x]\n",
- p->type, p->ctrl, p->seqid, p->u.r.ackid);
-
- err = send_tx_packet(lp, p, new_tail);
- if (!err)
- lp->snd_nxt++;
-
- return err;
-}
-
-static int ldc_abort(struct ldc_channel *lp)
-{
- unsigned long hv_err;
-
- ldcdbg(STATE, "ABORT\n");
-
- /* We report but do not act upon the hypervisor errors because
- * there really isn't much we can do if they fail at this point.
- */
- hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
- if (hv_err)
- printk(KERN_ERR PFX "ldc_abort: "
- "sun4v_ldc_tx_qconf(%lx,%lx,%lx) failed, err=%lu\n",
- lp->id, lp->tx_ra, lp->tx_num_entries, hv_err);
-
- hv_err = sun4v_ldc_tx_get_state(lp->id,
- &lp->tx_head,
- &lp->tx_tail,
- &lp->chan_state);
- if (hv_err)
- printk(KERN_ERR PFX "ldc_abort: "
- "sun4v_ldc_tx_get_state(%lx,...) failed, err=%lu\n",
- lp->id, hv_err);
-
- hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries);
- if (hv_err)
- printk(KERN_ERR PFX "ldc_abort: "
- "sun4v_ldc_rx_qconf(%lx,%lx,%lx) failed, err=%lu\n",
- lp->id, lp->rx_ra, lp->rx_num_entries, hv_err);
-
- /* Refetch the RX queue state as well, because we could be invoked
- * here in the queue processing context.
- */
- hv_err = sun4v_ldc_rx_get_state(lp->id,
- &lp->rx_head,
- &lp->rx_tail,
- &lp->chan_state);
- if (hv_err)
- printk(KERN_ERR PFX "ldc_abort: "
- "sun4v_ldc_rx_get_state(%lx,...) failed, err=%lu\n",
- lp->id, hv_err);
-
- return -ECONNRESET;
-}
-
-static struct ldc_version *find_by_major(u16 major)
-{
- struct ldc_version *ret = NULL;
- int i;
-
- for (i = 0; i < ARRAY_SIZE(ver_arr); i++) {
- struct ldc_version *v = &ver_arr[i];
- if (v->major <= major) {
- ret = v;
- break;
- }
- }
- return ret;
-}
-
-static int process_ver_info(struct ldc_channel *lp, struct ldc_version *vp)
-{
- struct ldc_version *vap;
- int err;
-
- ldcdbg(HS, "GOT VERSION INFO major[%x] minor[%x]\n",
- vp->major, vp->minor);
-
- if (lp->hs_state == LDC_HS_GOTVERS) {
- lp->hs_state = LDC_HS_OPEN;
- memset(&lp->ver, 0, sizeof(lp->ver));
- }
-
- vap = find_by_major(vp->major);
- if (!vap) {
- err = send_version_nack(lp, 0, 0);
- } else if (vap->major != vp->major) {
- err = send_version_nack(lp, vap->major, vap->minor);
- } else {
- struct ldc_version ver = *vp;
- if (ver.minor > vap->minor)
- ver.minor = vap->minor;
- err = send_version_ack(lp, &ver);
- if (!err) {
- lp->ver = ver;
- lp->hs_state = LDC_HS_GOTVERS;
- }
- }
- if (err)
- return ldc_abort(lp);
-
- return 0;
-}
-
-static int process_ver_ack(struct ldc_channel *lp, struct ldc_version *vp)
-{
- ldcdbg(HS, "GOT VERSION ACK major[%x] minor[%x]\n",
- vp->major, vp->minor);
-
- if (lp->hs_state == LDC_HS_GOTVERS) {
- if (lp->ver.major != vp->major ||
- lp->ver.minor != vp->minor)
- return ldc_abort(lp);
- } else {
- lp->ver = *vp;
- lp->hs_state = LDC_HS_GOTVERS;
- }
- if (send_rts(lp))
- return ldc_abort(lp);
- return 0;
-}
-
-static int process_ver_nack(struct ldc_channel *lp, struct ldc_version *vp)
-{
- struct ldc_version *vap;
-
- if ((vp->major == 0 && vp->minor == 0) ||
- !(vap = find_by_major(vp->major))) {
- return ldc_abort(lp);
- } else {
- struct ldc_packet *p;
- unsigned long new_tail;
-
- p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS,
- vap, sizeof(*vap),
- &new_tail);
- if (p)
- return send_tx_packet(lp, p, new_tail);
- else
- return ldc_abort(lp);
- }
-}
-
-static int process_version(struct ldc_channel *lp,
- struct ldc_packet *p)
-{
- struct ldc_version *vp;
-
- vp = (struct ldc_version *) p->u.u_data;
-
- switch (p->stype) {
- case LDC_INFO:
- return process_ver_info(lp, vp);
-
- case LDC_ACK:
- return process_ver_ack(lp, vp);
-
- case LDC_NACK:
- return process_ver_nack(lp, vp);
-
- default:
- return ldc_abort(lp);
- }
-}
-
-static int process_rts(struct ldc_channel *lp,
- struct ldc_packet *p)
-{
- ldcdbg(HS, "GOT RTS stype[%x] seqid[%x] env[%x]\n",
- p->stype, p->seqid, p->env);
-
- if (p->stype != LDC_INFO ||
- lp->hs_state != LDC_HS_GOTVERS ||
- p->env != lp->cfg.mode)
- return ldc_abort(lp);
-
- lp->snd_nxt = p->seqid;
- lp->rcv_nxt = p->seqid;
- lp->hs_state = LDC_HS_SENTRTR;
- if (send_rtr(lp))
- return ldc_abort(lp);
-
- return 0;
-}
-
-static int process_rtr(struct ldc_channel *lp,
- struct ldc_packet *p)
-{
- ldcdbg(HS, "GOT RTR stype[%x] seqid[%x] env[%x]\n",
- p->stype, p->seqid, p->env);
-
- if (p->stype != LDC_INFO ||
- p->env != lp->cfg.mode)
- return ldc_abort(lp);
-
- lp->snd_nxt = p->seqid;
- lp->hs_state = LDC_HS_COMPLETE;
- ldc_set_state(lp, LDC_STATE_CONNECTED);
- send_rdx(lp);
-
- return LDC_EVENT_UP;
-}
-
-static int rx_seq_ok(struct ldc_channel *lp, u32 seqid)
-{
- return lp->rcv_nxt + 1 == seqid;
-}
-
-static int process_rdx(struct ldc_channel *lp,
- struct ldc_packet *p)
-{
- ldcdbg(HS, "GOT RDX stype[%x] seqid[%x] env[%x] ackid[%x]\n",
- p->stype, p->seqid, p->env, p->u.r.ackid);
-
- if (p->stype != LDC_INFO ||
- !(rx_seq_ok(lp, p->seqid)))
- return ldc_abort(lp);
-
- lp->rcv_nxt = p->seqid;
-
- lp->hs_state = LDC_HS_COMPLETE;
- ldc_set_state(lp, LDC_STATE_CONNECTED);
-
- return LDC_EVENT_UP;
-}
-
-static int process_control_frame(struct ldc_channel *lp,
- struct ldc_packet *p)
-{
- switch (p->ctrl) {
- case LDC_VERS:
- return process_version(lp, p);
-
- case LDC_RTS:
- return process_rts(lp, p);
-
- case LDC_RTR:
- return process_rtr(lp, p);
-
- case LDC_RDX:
- return process_rdx(lp, p);
-
- default:
- return ldc_abort(lp);
- }
-}
-
-static int process_error_frame(struct ldc_channel *lp,
- struct ldc_packet *p)
-{
- return ldc_abort(lp);
-}
-
-static int process_data_ack(struct ldc_channel *lp,
- struct ldc_packet *ack)
-{
- unsigned long head = lp->tx_acked;
- u32 ackid = ack->u.r.ackid;
-
- while (1) {
- struct ldc_packet *p = lp->tx_base + (head / LDC_PACKET_SIZE);
-
- head = tx_advance(lp, head);
-
- if (p->seqid == ackid) {
- lp->tx_acked = head;
- return 0;
- }
- if (head == lp->tx_tail)
- return ldc_abort(lp);
- }
-
- return 0;
-}
-
-static void send_events(struct ldc_channel *lp, unsigned int event_mask)
-{
- if (event_mask & LDC_EVENT_RESET)
- lp->cfg.event(lp->event_arg, LDC_EVENT_RESET);
- if (event_mask & LDC_EVENT_UP)
- lp->cfg.event(lp->event_arg, LDC_EVENT_UP);
- if (event_mask & LDC_EVENT_DATA_READY)
- lp->cfg.event(lp->event_arg, LDC_EVENT_DATA_READY);
-}
-
-static irqreturn_t ldc_rx(int irq, void *dev_id)
-{
- struct ldc_channel *lp = dev_id;
- unsigned long orig_state, hv_err, flags;
- unsigned int event_mask;
-
- spin_lock_irqsave(&lp->lock, flags);
-
- orig_state = lp->chan_state;
- hv_err = sun4v_ldc_rx_get_state(lp->id,
- &lp->rx_head,
- &lp->rx_tail,
- &lp->chan_state);
-
- ldcdbg(RX, "RX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n",
- orig_state, lp->chan_state, lp->rx_head, lp->rx_tail);
-
- event_mask = 0;
-
- if (lp->cfg.mode == LDC_MODE_RAW &&
- lp->chan_state == LDC_CHANNEL_UP) {
- lp->hs_state = LDC_HS_COMPLETE;
- ldc_set_state(lp, LDC_STATE_CONNECTED);
-
- event_mask |= LDC_EVENT_UP;
-
- orig_state = lp->chan_state;
- }
-
- /* If we are in reset state, flush the RX queue and ignore
- * everything.
- */
- if (lp->flags & LDC_FLAG_RESET) {
- (void) __set_rx_head(lp, lp->rx_tail);
- goto out;
- }
-
- /* Once we finish the handshake, we let the ldc_read()
- * paths do all of the control frame and state management.
- * Just trigger the callback.
- */
- if (lp->hs_state == LDC_HS_COMPLETE) {
-handshake_complete:
- if (lp->chan_state != orig_state) {
- unsigned int event = LDC_EVENT_RESET;
-
- if (lp->chan_state == LDC_CHANNEL_UP)
- event = LDC_EVENT_UP;
-
- event_mask |= event;
- }
- if (lp->rx_head != lp->rx_tail)
- event_mask |= LDC_EVENT_DATA_READY;
-
- goto out;
- }
-
- if (lp->chan_state != orig_state)
- goto out;
-
- while (lp->rx_head != lp->rx_tail) {
- struct ldc_packet *p;
- unsigned long new;
- int err;
-
- p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE);
-
- switch (p->type) {
- case LDC_CTRL:
- err = process_control_frame(lp, p);
- if (err > 0)
- event_mask |= err;
- break;
-
- case LDC_DATA:
- event_mask |= LDC_EVENT_DATA_READY;
- err = 0;
- break;
-
- case LDC_ERR:
- err = process_error_frame(lp, p);
- break;
-
- default:
- err = ldc_abort(lp);
- break;
- }
-
- if (err < 0)
- break;
-
- new = lp->rx_head;
- new += LDC_PACKET_SIZE;
- if (new == (lp->rx_num_entries * LDC_PACKET_SIZE))
- new = 0;
- lp->rx_head = new;
-
- err = __set_rx_head(lp, new);
- if (err < 0) {
- (void) ldc_abort(lp);
- break;
- }
- if (lp->hs_state == LDC_HS_COMPLETE)
- goto handshake_complete;
- }
-
-out:
- spin_unlock_irqrestore(&lp->lock, flags);
-
- send_events(lp, event_mask);
-
- return IRQ_HANDLED;
-}
-
-static irqreturn_t ldc_tx(int irq, void *dev_id)
-{
- struct ldc_channel *lp = dev_id;
- unsigned long flags, hv_err, orig_state;
- unsigned int event_mask = 0;
-
- spin_lock_irqsave(&lp->lock, flags);
-
- orig_state = lp->chan_state;
- hv_err = sun4v_ldc_tx_get_state(lp->id,
- &lp->tx_head,
- &lp->tx_tail,
- &lp->chan_state);
-
- ldcdbg(TX, " TX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n",
- orig_state, lp->chan_state, lp->tx_head, lp->tx_tail);
-
- if (lp->cfg.mode == LDC_MODE_RAW &&
- lp->chan_state == LDC_CHANNEL_UP) {
- lp->hs_state = LDC_HS_COMPLETE;
- ldc_set_state(lp, LDC_STATE_CONNECTED);
-
- event_mask |= LDC_EVENT_UP;
- }
-
- spin_unlock_irqrestore(&lp->lock, flags);
-
- send_events(lp, event_mask);
-
- return IRQ_HANDLED;
-}
-
-/* XXX ldc_alloc() and ldc_free() needs to run under a mutex so
- * XXX that addition and removal from the ldc_channel_list has
- * XXX atomicity, otherwise the __ldc_channel_exists() check is
- * XXX totally pointless as another thread can slip into ldc_alloc()
- * XXX and add a channel with the same ID. There also needs to be
- * XXX a spinlock for ldc_channel_list.
- */
-static HLIST_HEAD(ldc_channel_list);
-
-static int __ldc_channel_exists(unsigned long id)
-{
- struct ldc_channel *lp;
- struct hlist_node *n;
-
- hlist_for_each_entry(lp, n, &ldc_channel_list, list) {
- if (lp->id == id)
- return 1;
- }
- return 0;
-}
-
-static int alloc_queue(const char *name, unsigned long num_entries,
- struct ldc_packet **base, unsigned long *ra)
-{
- unsigned long size, order;
- void *q;
-
- size = num_entries * LDC_PACKET_SIZE;
- order = get_order(size);
-
- q = (void *) __get_free_pages(GFP_KERNEL, order);
- if (!q) {
- printk(KERN_ERR PFX "Alloc of %s queue failed with "
- "size=%lu order=%lu\n", name, size, order);
- return -ENOMEM;
- }
-
- memset(q, 0, PAGE_SIZE << order);
-
- *base = q;
- *ra = __pa(q);
-
- return 0;
-}
-
-static void free_queue(unsigned long num_entries, struct ldc_packet *q)
-{
- unsigned long size, order;
-
- if (!q)
- return;
-
- size = num_entries * LDC_PACKET_SIZE;
- order = get_order(size);
-
- free_pages((unsigned long)q, order);
-}
-
-/* XXX Make this configurable... XXX */
-#define LDC_IOTABLE_SIZE (8 * 1024)
-
-static int ldc_iommu_init(struct ldc_channel *lp)
-{
- unsigned long sz, num_tsb_entries, tsbsize, order;
- struct ldc_iommu *iommu = &lp->iommu;
- struct ldc_mtable_entry *table;
- unsigned long hv_err;
- int err;
-
- num_tsb_entries = LDC_IOTABLE_SIZE;
- tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry);
-
- spin_lock_init(&iommu->lock);
-
- sz = num_tsb_entries / 8;
- sz = (sz + 7UL) & ~7UL;
- iommu->arena.map = kzalloc(sz, GFP_KERNEL);
- if (!iommu->arena.map) {
- printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz);
- return -ENOMEM;
- }
-
- iommu->arena.limit = num_tsb_entries;
-
- order = get_order(tsbsize);
-
- table = (struct ldc_mtable_entry *)
- __get_free_pages(GFP_KERNEL, order);
- err = -ENOMEM;
- if (!table) {
- printk(KERN_ERR PFX "Alloc of MTE table failed, "
- "size=%lu order=%lu\n", tsbsize, order);
- goto out_free_map;
- }
-
- memset(table, 0, PAGE_SIZE << order);
-
- iommu->page_table = table;
-
- hv_err = sun4v_ldc_set_map_table(lp->id, __pa(table),
- num_tsb_entries);
- err = -EINVAL;
- if (hv_err)
- goto out_free_table;
-
- return 0;
-
-out_free_table:
- free_pages((unsigned long) table, order);
- iommu->page_table = NULL;
-
-out_free_map:
- kfree(iommu->arena.map);
- iommu->arena.map = NULL;
-
- return err;
-}
-
-static void ldc_iommu_release(struct ldc_channel *lp)
-{
- struct ldc_iommu *iommu = &lp->iommu;
- unsigned long num_tsb_entries, tsbsize, order;
-
- (void) sun4v_ldc_set_map_table(lp->id, 0, 0);
-
- num_tsb_entries = iommu->arena.limit;
- tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry);
- order = get_order(tsbsize);
-
- free_pages((unsigned long) iommu->page_table, order);
- iommu->page_table = NULL;
-
- kfree(iommu->arena.map);
- iommu->arena.map = NULL;
-}
-
-struct ldc_channel *ldc_alloc(unsigned long id,
- const struct ldc_channel_config *cfgp,
- void *event_arg)
-{
- struct ldc_channel *lp;
- const struct ldc_mode_ops *mops;
- unsigned long dummy1, dummy2, hv_err;
- u8 mss, *mssbuf;
- int err;
-
- err = -ENODEV;
- if (!ldom_domaining_enabled)
- goto out_err;
-
- err = -EINVAL;
- if (!cfgp)
- goto out_err;
-
- switch (cfgp->mode) {
- case LDC_MODE_RAW:
- mops = &raw_ops;
- mss = LDC_PACKET_SIZE;
- break;
-
- case LDC_MODE_UNRELIABLE:
- mops = &nonraw_ops;
- mss = LDC_PACKET_SIZE - 8;
- break;
-
- case LDC_MODE_STREAM:
- mops = &stream_ops;
- mss = LDC_PACKET_SIZE - 8 - 8;
- break;
-
- default:
- goto out_err;
- }
-
- if (!cfgp->event || !event_arg || !cfgp->rx_irq || !cfgp->tx_irq)
- goto out_err;
-
- hv_err = sun4v_ldc_tx_qinfo(id, &dummy1, &dummy2);
- err = -ENODEV;
- if (hv_err == HV_ECHANNEL)
- goto out_err;
-
- err = -EEXIST;
- if (__ldc_channel_exists(id))
- goto out_err;
-
- mssbuf = NULL;
-
- lp = kzalloc(sizeof(*lp), GFP_KERNEL);
- err = -ENOMEM;
- if (!lp)
- goto out_err;
-
- spin_lock_init(&lp->lock);
-
- lp->id = id;
-
- err = ldc_iommu_init(lp);
- if (err)
- goto out_free_ldc;
-
- lp->mops = mops;
- lp->mss = mss;
-
- lp->cfg = *cfgp;
- if (!lp->cfg.mtu)
- lp->cfg.mtu = LDC_DEFAULT_MTU;
-
- if (lp->cfg.mode == LDC_MODE_STREAM) {
- mssbuf = kzalloc(lp->cfg.mtu, GFP_KERNEL);
- if (!mssbuf) {
- err = -ENOMEM;
- goto out_free_iommu;
- }
- lp->mssbuf = mssbuf;
- }
-
- lp->event_arg = event_arg;
-
- /* XXX allow setting via ldc_channel_config to override defaults
- * XXX or use some formula based upon mtu
- */
- lp->tx_num_entries = LDC_DEFAULT_NUM_ENTRIES;
- lp->rx_num_entries = LDC_DEFAULT_NUM_ENTRIES;
-
- err = alloc_queue("TX", lp->tx_num_entries,
- &lp->tx_base, &lp->tx_ra);
- if (err)
- goto out_free_mssbuf;
-
- err = alloc_queue("RX", lp->rx_num_entries,
- &lp->rx_base, &lp->rx_ra);
- if (err)
- goto out_free_txq;
-
- lp->flags |= LDC_FLAG_ALLOCED_QUEUES;
-
- lp->hs_state = LDC_HS_CLOSED;
- ldc_set_state(lp, LDC_STATE_INIT);
-
- INIT_HLIST_NODE(&lp->list);
- hlist_add_head(&lp->list, &ldc_channel_list);
-
- INIT_HLIST_HEAD(&lp->mh_list);
-
- return lp;
-
-out_free_txq:
- free_queue(lp->tx_num_entries, lp->tx_base);
-
-out_free_mssbuf:
- if (mssbuf)
- kfree(mssbuf);
-
-out_free_iommu:
- ldc_iommu_release(lp);
-
-out_free_ldc:
- kfree(lp);
-
-out_err:
- return ERR_PTR(err);
-}
-EXPORT_SYMBOL(ldc_alloc);
-
-void ldc_free(struct ldc_channel *lp)
-{
- if (lp->flags & LDC_FLAG_REGISTERED_IRQS) {
- free_irq(lp->cfg.rx_irq, lp);
- free_irq(lp->cfg.tx_irq, lp);
- }
-
- if (lp->flags & LDC_FLAG_REGISTERED_QUEUES) {
- sun4v_ldc_tx_qconf(lp->id, 0, 0);
- sun4v_ldc_rx_qconf(lp->id, 0, 0);
- lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES;
- }
- if (lp->flags & LDC_FLAG_ALLOCED_QUEUES) {
- free_queue(lp->tx_num_entries, lp->tx_base);
- free_queue(lp->rx_num_entries, lp->rx_base);
- lp->flags &= ~LDC_FLAG_ALLOCED_QUEUES;
- }
-
- hlist_del(&lp->list);
-
- if (lp->mssbuf)
- kfree(lp->mssbuf);
-
- ldc_iommu_release(lp);
-
- kfree(lp);
-}
-EXPORT_SYMBOL(ldc_free);
-
-/* Bind the channel. This registers the LDC queues with
- * the hypervisor and puts the channel into a pseudo-listening
- * state. This does not initiate a handshake, ldc_connect() does
- * that.
- */
-int ldc_bind(struct ldc_channel *lp, const char *name)
-{
- unsigned long hv_err, flags;
- int err = -EINVAL;
-
- if (!name ||
- (lp->state != LDC_STATE_INIT))
- return -EINVAL;
-
- snprintf(lp->rx_irq_name, LDC_IRQ_NAME_MAX, "%s RX", name);
- snprintf(lp->tx_irq_name, LDC_IRQ_NAME_MAX, "%s TX", name);
-
- err = request_irq(lp->cfg.rx_irq, ldc_rx,
- IRQF_SAMPLE_RANDOM | IRQF_SHARED,
- lp->rx_irq_name, lp);
- if (err)
- return err;
-
- err = request_irq(lp->cfg.tx_irq, ldc_tx,
- IRQF_SAMPLE_RANDOM | IRQF_SHARED,
- lp->tx_irq_name, lp);
- if (err) {
- free_irq(lp->cfg.rx_irq, lp);
- return err;
- }
-
-
- spin_lock_irqsave(&lp->lock, flags);
-
- enable_irq(lp->cfg.rx_irq);
- enable_irq(lp->cfg.tx_irq);
-
- lp->flags |= LDC_FLAG_REGISTERED_IRQS;
-
- err = -ENODEV;
- hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0);
- if (hv_err)
- goto out_free_irqs;
-
- hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
- if (hv_err)
- goto out_free_irqs;
-
- hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0);
- if (hv_err)
- goto out_unmap_tx;
-
- hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries);
- if (hv_err)
- goto out_unmap_tx;
-
- lp->flags |= LDC_FLAG_REGISTERED_QUEUES;
-
- hv_err = sun4v_ldc_tx_get_state(lp->id,
- &lp->tx_head,
- &lp->tx_tail,
- &lp->chan_state);
- err = -EBUSY;
- if (hv_err)
- goto out_unmap_rx;
-
- lp->tx_acked = lp->tx_head;
-
- lp->hs_state = LDC_HS_OPEN;
- ldc_set_state(lp, LDC_STATE_BOUND);
-
- spin_unlock_irqrestore(&lp->lock, flags);
-
- return 0;
-
-out_unmap_rx:
- lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES;
- sun4v_ldc_rx_qconf(lp->id, 0, 0);
-
-out_unmap_tx:
- sun4v_ldc_tx_qconf(lp->id, 0, 0);
-
-out_free_irqs:
- lp->flags &= ~LDC_FLAG_REGISTERED_IRQS;
- free_irq(lp->cfg.tx_irq, lp);
- free_irq(lp->cfg.rx_irq, lp);
-
- spin_unlock_irqrestore(&lp->lock, flags);
-
- return err;
-}
-EXPORT_SYMBOL(ldc_bind);
-
-int ldc_connect(struct ldc_channel *lp)
-{
- unsigned long flags;
- int err;
-
- if (lp->cfg.mode == LDC_MODE_RAW)
- return -EINVAL;
-
- spin_lock_irqsave(&lp->lock, flags);
-
- if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) ||
- !(lp->flags & LDC_FLAG_REGISTERED_QUEUES) ||
- lp->hs_state != LDC_HS_OPEN)
- err = -EINVAL;
- else
- err = start_handshake(lp);
-
- spin_unlock_irqrestore(&lp->lock, flags);
-
- return err;
-}
-EXPORT_SYMBOL(ldc_connect);
-
-int ldc_disconnect(struct ldc_channel *lp)
-{
- unsigned long hv_err, flags;
- int err;
-
- if (lp->cfg.mode == LDC_MODE_RAW)
- return -EINVAL;
-
- if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) ||
- !(lp->flags & LDC_FLAG_REGISTERED_QUEUES))
- return -EINVAL;
-
- spin_lock_irqsave(&lp->lock, flags);
-
- err = -ENODEV;
- hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0);
- if (hv_err)
- goto out_err;
-
- hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
- if (hv_err)
- goto out_err;
-
- hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0);
- if (hv_err)
- goto out_err;
-
- hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries);
- if (hv_err)
- goto out_err;
-
- ldc_set_state(lp, LDC_STATE_BOUND);
- lp->hs_state = LDC_HS_OPEN;
- lp->flags |= LDC_FLAG_RESET;
-
- spin_unlock_irqrestore(&lp->lock, flags);
-
- return 0;
-
-out_err:
- sun4v_ldc_tx_qconf(lp->id, 0, 0);
- sun4v_ldc_rx_qconf(lp->id, 0, 0);
- free_irq(lp->cfg.tx_irq, lp);
- free_irq(lp->cfg.rx_irq, lp);
- lp->flags &= ~(LDC_FLAG_REGISTERED_IRQS |
- LDC_FLAG_REGISTERED_QUEUES);
- ldc_set_state(lp, LDC_STATE_INIT);
-
- spin_unlock_irqrestore(&lp->lock, flags);
-
- return err;
-}
-EXPORT_SYMBOL(ldc_disconnect);
-
-int ldc_state(struct ldc_channel *lp)
-{
- return lp->state;
-}
-EXPORT_SYMBOL(ldc_state);
-
-static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size)
-{
- struct ldc_packet *p;
- unsigned long new_tail;
- int err;
-
- if (size > LDC_PACKET_SIZE)
- return -EMSGSIZE;
-
- p = data_get_tx_packet(lp, &new_tail);
- if (!p)
- return -EAGAIN;
-
- memcpy(p, buf, size);
-
- err = send_tx_packet(lp, p, new_tail);
- if (!err)
- err = size;
-
- return err;
-}
-
-static int read_raw(struct ldc_channel *lp, void *buf, unsigned int size)
-{
- struct ldc_packet *p;
- unsigned long hv_err, new;
- int err;
-
- if (size < LDC_PACKET_SIZE)
- return -EINVAL;
-
- hv_err = sun4v_ldc_rx_get_state(lp->id,
- &lp->rx_head,
- &lp->rx_tail,
- &lp->chan_state);
- if (hv_err)
- return ldc_abort(lp);
-
- if (lp->chan_state == LDC_CHANNEL_DOWN ||
- lp->chan_state == LDC_CHANNEL_RESETTING)
- return -ECONNRESET;
-
- if (lp->rx_head == lp->rx_tail)
- return 0;
-
- p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE);
- memcpy(buf, p, LDC_PACKET_SIZE);
-
- new = rx_advance(lp, lp->rx_head);
- lp->rx_head = new;
-
- err = __set_rx_head(lp, new);
- if (err < 0)
- err = -ECONNRESET;
- else
- err = LDC_PACKET_SIZE;
-
- return err;
-}
-
-static const struct ldc_mode_ops raw_ops = {
- .write = write_raw,
- .read = read_raw,
-};
-
-static int write_nonraw(struct ldc_channel *lp, const void *buf,
- unsigned int size)
-{
- unsigned long hv_err, tail;
- unsigned int copied;
- u32 seq;
- int err;
-
- hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail,
- &lp->chan_state);
- if (unlikely(hv_err))
- return -EBUSY;
-
- if (unlikely(lp->chan_state != LDC_CHANNEL_UP))
- return ldc_abort(lp);
-
- if (!tx_has_space_for(lp, size))
- return -EAGAIN;
-
- seq = lp->snd_nxt;
- copied = 0;
- tail = lp->tx_tail;
- while (copied < size) {
- struct ldc_packet *p = lp->tx_base + (tail / LDC_PACKET_SIZE);
- u8 *data = ((lp->cfg.mode == LDC_MODE_UNRELIABLE) ?
- p->u.u_data :
- p->u.r.r_data);
- int data_len;
-
- p->type = LDC_DATA;
- p->stype = LDC_INFO;
- p->ctrl = 0;
-
- data_len = size - copied;
- if (data_len > lp->mss)
- data_len = lp->mss;
-
- BUG_ON(data_len > LDC_LEN);
-
- p->env = (data_len |
- (copied == 0 ? LDC_START : 0) |
- (data_len == size - copied ? LDC_STOP : 0));
-
- p->seqid = ++seq;
-
- ldcdbg(DATA, "SENT DATA [%02x:%02x:%02x:%02x:%08x]\n",
- p->type,
- p->stype,
- p->ctrl,
- p->env,
- p->seqid);
-
- memcpy(data, buf, data_len);
- buf += data_len;
- copied += data_len;
-
- tail = tx_advance(lp, tail);
- }
-
- err = set_tx_tail(lp, tail);
- if (!err) {
- lp->snd_nxt = seq;
- err = size;
- }
-
- return err;
-}
-
-static int rx_bad_seq(struct ldc_channel *lp, struct ldc_packet *p,
- struct ldc_packet *first_frag)
-{
- int err;
-
- if (first_frag)
- lp->rcv_nxt = first_frag->seqid - 1;
-
- err = send_data_nack(lp, p);
- if (err)
- return err;
-
- err = __set_rx_head(lp, lp->rx_tail);
- if (err < 0)
- return ldc_abort(lp);
-
- return 0;
-}
-
-static int data_ack_nack(struct ldc_channel *lp, struct ldc_packet *p)
-{
- if (p->stype & LDC_ACK) {
- int err = process_data_ack(lp, p);
- if (err)
- return err;
- }
- if (p->stype & LDC_NACK)
- return ldc_abort(lp);
-
- return 0;
-}
-
-static int rx_data_wait(struct ldc_channel *lp, unsigned long cur_head)
-{
- unsigned long dummy;
- int limit = 1000;
-
- ldcdbg(DATA, "DATA WAIT cur_head[%lx] rx_head[%lx] rx_tail[%lx]\n",
- cur_head, lp->rx_head, lp->rx_tail);
- while (limit-- > 0) {
- unsigned long hv_err;
-
- hv_err = sun4v_ldc_rx_get_state(lp->id,
- &dummy,
- &lp->rx_tail,
- &lp->chan_state);
- if (hv_err)
- return ldc_abort(lp);
-
- if (lp->chan_state == LDC_CHANNEL_DOWN ||
- lp->chan_state == LDC_CHANNEL_RESETTING)
- return -ECONNRESET;
-
- if (cur_head != lp->rx_tail) {
- ldcdbg(DATA, "DATA WAIT DONE "
- "head[%lx] tail[%lx] chan_state[%lx]\n",
- dummy, lp->rx_tail, lp->chan_state);
- return 0;
- }
-
- udelay(1);
- }
- return -EAGAIN;
-}
-
-static int rx_set_head(struct ldc_channel *lp, unsigned long head)
-{
- int err = __set_rx_head(lp, head);
-
- if (err < 0)
- return ldc_abort(lp);
-
- lp->rx_head = head;
- return 0;
-}
-
-static void send_data_ack(struct ldc_channel *lp)
-{
- unsigned long new_tail;
- struct ldc_packet *p;
-
- p = data_get_tx_packet(lp, &new_tail);
- if (likely(p)) {
- int err;
-
- memset(p, 0, sizeof(*p));
- p->type = LDC_DATA;
- p->stype = LDC_ACK;
- p->ctrl = 0;
- p->seqid = lp->snd_nxt + 1;
- p->u.r.ackid = lp->rcv_nxt;
-
- err = send_tx_packet(lp, p, new_tail);
- if (!err)
- lp->snd_nxt++;
- }
-}
-
-static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size)
-{
- struct ldc_packet *first_frag;
- unsigned long hv_err, new;
- int err, copied;
-
- hv_err = sun4v_ldc_rx_get_state(lp->id,
- &lp->rx_head,
- &lp->rx_tail,
- &lp->chan_state);
- if (hv_err)
- return ldc_abort(lp);
-
- if (lp->chan_state == LDC_CHANNEL_DOWN ||
- lp->chan_state == LDC_CHANNEL_RESETTING)
- return -ECONNRESET;
-
- if (lp->rx_head == lp->rx_tail)
- return 0;
-
- first_frag = NULL;
- copied = err = 0;
- new = lp->rx_head;
- while (1) {
- struct ldc_packet *p;
- int pkt_len;
-
- BUG_ON(new == lp->rx_tail);
- p = lp->rx_base + (new / LDC_PACKET_SIZE);
-
- ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] "
- "rcv_nxt[%08x]\n",
- p->type,
- p->stype,
- p->ctrl,
- p->env,
- p->seqid,
- p->u.r.ackid,
- lp->rcv_nxt);
-
- if (unlikely(!rx_seq_ok(lp, p->seqid))) {
- err = rx_bad_seq(lp, p, first_frag);
- copied = 0;
- break;
- }
-
- if (p->type & LDC_CTRL) {
- err = process_control_frame(lp, p);
- if (err < 0)
- break;
- err = 0;
- }
-
- lp->rcv_nxt = p->seqid;
-
- if (!(p->type & LDC_DATA)) {
- new = rx_advance(lp, new);
- goto no_data;
- }
- if (p->stype & (LDC_ACK | LDC_NACK)) {
- err = data_ack_nack(lp, p);
- if (err)
- break;
- }
- if (!(p->stype & LDC_INFO)) {
- new = rx_advance(lp, new);
- err = rx_set_head(lp, new);
- if (err)
- break;
- goto no_data;
- }
-
- pkt_len = p->env & LDC_LEN;
-
- /* Every initial packet starts with the START bit set.
- *
- * Singleton packets will have both START+STOP set.
- *
- * Fragments will have START set in the first frame, STOP
- * set in the last frame, and neither bit set in middle
- * frames of the packet.
- *
- * Therefore if we are at the beginning of a packet and
- * we don't see START, or we are in the middle of a fragmented
- * packet and do see START, we are unsynchronized and should
- * flush the RX queue.
- */
- if ((first_frag == NULL && !(p->env & LDC_START)) ||
- (first_frag != NULL && (p->env & LDC_START))) {
- if (!first_frag)
- new = rx_advance(lp, new);
-
- err = rx_set_head(lp, new);
- if (err)
- break;
-
- if (!first_frag)
- goto no_data;
- }
- if (!first_frag)
- first_frag = p;
-
- if (pkt_len > size - copied) {
- /* User didn't give us a big enough buffer,
- * what to do? This is a pretty serious error.
- *
- * Since we haven't updated the RX ring head to
- * consume any of the packets, signal the error
- * to the user and just leave the RX ring alone.
- *
- * This seems the best behavior because this allows
- * a user of the LDC layer to start with a small
- * RX buffer for ldc_read() calls and use -EMSGSIZE
- * as a cue to enlarge it's read buffer.
- */
- err = -EMSGSIZE;
- break;
- }
-
- /* Ok, we are gonna eat this one. */
- new = rx_advance(lp, new);
-
- memcpy(buf,
- (lp->cfg.mode == LDC_MODE_UNRELIABLE ?
- p->u.u_data : p->u.r.r_data), pkt_len);
- buf += pkt_len;
- copied += pkt_len;
-
- if (p->env & LDC_STOP)
- break;
-
-no_data:
- if (new == lp->rx_tail) {
- err = rx_data_wait(lp, new);
- if (err)
- break;
- }
- }
-
- if (!err)
- err = rx_set_head(lp, new);
-
- if (err && first_frag)
- lp->rcv_nxt = first_frag->seqid - 1;
-
- if (!err) {
- err = copied;
- if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE)
- send_data_ack(lp);
- }
-
- return err;
-}
-
-static const struct ldc_mode_ops nonraw_ops = {
- .write = write_nonraw,
- .read = read_nonraw,
-};
-
-static int write_stream(struct ldc_channel *lp, const void *buf,
- unsigned int size)
-{
- if (size > lp->cfg.mtu)
- size = lp->cfg.mtu;
- return write_nonraw(lp, buf, size);
-}
-
-static int read_stream(struct ldc_channel *lp, void *buf, unsigned int size)
-{
- if (!lp->mssbuf_len) {
- int err = read_nonraw(lp, lp->mssbuf, lp->cfg.mtu);
- if (err < 0)
- return err;
-
- lp->mssbuf_len = err;
- lp->mssbuf_off = 0;
- }
-
- if (size > lp->mssbuf_len)
- size = lp->mssbuf_len;
- memcpy(buf, lp->mssbuf + lp->mssbuf_off, size);
-
- lp->mssbuf_off += size;
- lp->mssbuf_len -= size;
-
- return size;
-}
-
-static const struct ldc_mode_ops stream_ops = {
- .write = write_stream,
- .read = read_stream,
-};
-
-int ldc_write(struct ldc_channel *lp, const void *buf, unsigned int size)
-{
- unsigned long flags;
- int err;
-
- if (!buf)
- return -EINVAL;
-
- if (!size)
- return 0;
-
- spin_lock_irqsave(&lp->lock, flags);
-
- if (lp->hs_state != LDC_HS_COMPLETE)
- err = -ENOTCONN;
- else
- err = lp->mops->write(lp, buf, size);
-
- spin_unlock_irqrestore(&lp->lock, flags);
-
- return err;
-}
-EXPORT_SYMBOL(ldc_write);
-
-int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size)
-{
- unsigned long flags;
- int err;
-
- if (!buf)
- return -EINVAL;
-
- if (!size)
- return 0;
-
- spin_lock_irqsave(&lp->lock, flags);
-
- if (lp->hs_state != LDC_HS_COMPLETE)
- err = -ENOTCONN;
- else
- err = lp->mops->read(lp, buf, size);
-
- spin_unlock_irqrestore(&lp->lock, flags);
-
- return err;
-}
-EXPORT_SYMBOL(ldc_read);
-
-static long arena_alloc(struct ldc_iommu *iommu, unsigned long npages)
-{
- struct iommu_arena *arena = &iommu->arena;
- unsigned long n, i, start, end, limit;
- int pass;
-
- limit = arena->limit;
- start = arena->hint;
- pass = 0;
-
-again:
- n = find_next_zero_bit(arena->map, limit, start);
- end = n + npages;
- if (unlikely(end >= limit)) {
- if (likely(pass < 1)) {
- limit = start;
- start = 0;
- pass++;
- goto again;
- } else {
- /* Scanned the whole thing, give up. */
- return -1;
- }
- }
-
- for (i = n; i < end; i++) {
- if (test_bit(i, arena->map)) {
- start = i + 1;
- goto again;
- }
- }
-
- for (i = n; i < end; i++)
- __set_bit(i, arena->map);
-
- arena->hint = end;
-
- return n;
-}
-
-#define COOKIE_PGSZ_CODE 0xf000000000000000ULL
-#define COOKIE_PGSZ_CODE_SHIFT 60ULL
-
-static u64 pagesize_code(void)
-{
- switch (PAGE_SIZE) {
- default:
- case (8ULL * 1024ULL):
- return 0;
- case (64ULL * 1024ULL):
- return 1;
- case (512ULL * 1024ULL):
- return 2;
- case (4ULL * 1024ULL * 1024ULL):
- return 3;
- case (32ULL * 1024ULL * 1024ULL):
- return 4;
- case (256ULL * 1024ULL * 1024ULL):
- return 5;
- }
-}
-
-static u64 make_cookie(u64 index, u64 pgsz_code, u64 page_offset)
-{
- return ((pgsz_code << COOKIE_PGSZ_CODE_SHIFT) |
- (index << PAGE_SHIFT) |
- page_offset);
-}
-
-static u64 cookie_to_index(u64 cookie, unsigned long *shift)
-{
- u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT;
-
- cookie &= ~COOKIE_PGSZ_CODE;
-
- *shift = szcode * 3;
-
- return (cookie >> (13ULL + (szcode * 3ULL)));
-}
-
-static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu,
- unsigned long npages)
-{
- long entry;
-
- entry = arena_alloc(iommu, npages);
- if (unlikely(entry < 0))
- return NULL;
-
- return iommu->page_table + entry;
-}
-
-static u64 perm_to_mte(unsigned int map_perm)
-{
- u64 mte_base;
-
- mte_base = pagesize_code();
-
- if (map_perm & LDC_MAP_SHADOW) {
- if (map_perm & LDC_MAP_R)
- mte_base |= LDC_MTE_COPY_R;
- if (map_perm & LDC_MAP_W)
- mte_base |= LDC_MTE_COPY_W;
- }
- if (map_perm & LDC_MAP_DIRECT) {
- if (map_perm & LDC_MAP_R)
- mte_base |= LDC_MTE_READ;
- if (map_perm & LDC_MAP_W)
- mte_base |= LDC_MTE_WRITE;
- if (map_perm & LDC_MAP_X)
- mte_base |= LDC_MTE_EXEC;
- }
- if (map_perm & LDC_MAP_IO) {
- if (map_perm & LDC_MAP_R)
- mte_base |= LDC_MTE_IOMMU_R;
- if (map_perm & LDC_MAP_W)
- mte_base |= LDC_MTE_IOMMU_W;
- }
-
- return mte_base;
-}
-
-static int pages_in_region(unsigned long base, long len)
-{
- int count = 0;
-
- do {
- unsigned long new = (base + PAGE_SIZE) & PAGE_MASK;
-
- len -= (new - base);
- base = new;
- count++;
- } while (len > 0);
-
- return count;
-}
-
-struct cookie_state {
- struct ldc_mtable_entry *page_table;
- struct ldc_trans_cookie *cookies;
- u64 mte_base;
- u64 prev_cookie;
- u32 pte_idx;
- u32 nc;
-};
-
-static void fill_cookies(struct cookie_state *sp, unsigned long pa,
- unsigned long off, unsigned long len)
-{
- do {
- unsigned long tlen, new = pa + PAGE_SIZE;
- u64 this_cookie;
-
- sp->page_table[sp->pte_idx].mte = sp->mte_base | pa;
-
- tlen = PAGE_SIZE;
- if (off)
- tlen = PAGE_SIZE - off;
- if (tlen > len)
- tlen = len;
-
- this_cookie = make_cookie(sp->pte_idx,
- pagesize_code(), off);
-
- off = 0;
-
- if (this_cookie == sp->prev_cookie) {
- sp->cookies[sp->nc - 1].cookie_size += tlen;
- } else {
- sp->cookies[sp->nc].cookie_addr = this_cookie;
- sp->cookies[sp->nc].cookie_size = tlen;
- sp->nc++;
- }
- sp->prev_cookie = this_cookie + tlen;
-
- sp->pte_idx++;
-
- len -= tlen;
- pa = new;
- } while (len > 0);
-}
-
-static int sg_count_one(struct scatterlist *sg)
-{
- unsigned long base = page_to_pfn(sg_page(sg)) << PAGE_SHIFT;
- long len = sg->length;
-
- if ((sg->offset | len) & (8UL - 1))
- return -EFAULT;
-
- return pages_in_region(base + sg->offset, len);
-}
-
-static int sg_count_pages(struct scatterlist *sg, int num_sg)
-{
- int count;
- int i;
-
- count = 0;
- for (i = 0; i < num_sg; i++) {
- int err = sg_count_one(sg + i);
- if (err < 0)
- return err;
- count += err;
- }
-
- return count;
-}
-
-int ldc_map_sg(struct ldc_channel *lp,
- struct scatterlist *sg, int num_sg,
- struct ldc_trans_cookie *cookies, int ncookies,
- unsigned int map_perm)
-{
- unsigned long i, npages, flags;
- struct ldc_mtable_entry *base;
- struct cookie_state state;
- struct ldc_iommu *iommu;
- int err;
-
- if (map_perm & ~LDC_MAP_ALL)
- return -EINVAL;
-
- err = sg_count_pages(sg, num_sg);
- if (err < 0)
- return err;
-
- npages = err;
- if (err > ncookies)
- return -EMSGSIZE;
-
- iommu = &lp->iommu;
-
- spin_lock_irqsave(&iommu->lock, flags);
- base = alloc_npages(iommu, npages);
- spin_unlock_irqrestore(&iommu->lock, flags);
-
- if (!base)
- return -ENOMEM;
-
- state.page_table = iommu->page_table;
- state.cookies = cookies;
- state.mte_base = perm_to_mte(map_perm);
- state.prev_cookie = ~(u64)0;
- state.pte_idx = (base - iommu->page_table);
- state.nc = 0;
-
- for (i = 0; i < num_sg; i++)
- fill_cookies(&state, page_to_pfn(sg_page(&sg[i])) << PAGE_SHIFT,
- sg[i].offset, sg[i].length);
-
- return state.nc;
-}
-EXPORT_SYMBOL(ldc_map_sg);
-
-int ldc_map_single(struct ldc_channel *lp,
- void *buf, unsigned int len,
- struct ldc_trans_cookie *cookies, int ncookies,
- unsigned int map_perm)
-{
- unsigned long npages, pa, flags;
- struct ldc_mtable_entry *base;
- struct cookie_state state;
- struct ldc_iommu *iommu;
-
- if ((map_perm & ~LDC_MAP_ALL) || (ncookies < 1))
- return -EINVAL;
-
- pa = __pa(buf);
- if ((pa | len) & (8UL - 1))
- return -EFAULT;
-
- npages = pages_in_region(pa, len);
-
- iommu = &lp->iommu;
-
- spin_lock_irqsave(&iommu->lock, flags);
- base = alloc_npages(iommu, npages);
- spin_unlock_irqrestore(&iommu->lock, flags);
-
- if (!base)
- return -ENOMEM;
-
- state.page_table = iommu->page_table;
- state.cookies = cookies;
- state.mte_base = perm_to_mte(map_perm);
- state.prev_cookie = ~(u64)0;
- state.pte_idx = (base - iommu->page_table);
- state.nc = 0;
- fill_cookies(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len);
- BUG_ON(state.nc != 1);
-
- return state.nc;
-}
-EXPORT_SYMBOL(ldc_map_single);
-
-static void free_npages(unsigned long id, struct ldc_iommu *iommu,
- u64 cookie, u64 size)
-{
- struct iommu_arena *arena = &iommu->arena;
- unsigned long i, shift, index, npages;
- struct ldc_mtable_entry *base;
-
- npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT;
- index = cookie_to_index(cookie, &shift);
- base = iommu->page_table + index;
-
- BUG_ON(index > arena->limit ||
- (index + npages) > arena->limit);
-
- for (i = 0; i < npages; i++) {
- if (base->cookie)
- sun4v_ldc_revoke(id, cookie + (i << shift),
- base->cookie);
- base->mte = 0;
- __clear_bit(index + i, arena->map);
- }
-}
-
-void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies,
- int ncookies)
-{
- struct ldc_iommu *iommu = &lp->iommu;
- unsigned long flags;
- int i;
-
- spin_lock_irqsave(&iommu->lock, flags);
- for (i = 0; i < ncookies; i++) {
- u64 addr = cookies[i].cookie_addr;
- u64 size = cookies[i].cookie_size;
-
- free_npages(lp->id, iommu, addr, size);
- }
- spin_unlock_irqrestore(&iommu->lock, flags);
-}
-EXPORT_SYMBOL(ldc_unmap);
-
-int ldc_copy(struct ldc_channel *lp, int copy_dir,
- void *buf, unsigned int len, unsigned long offset,
- struct ldc_trans_cookie *cookies, int ncookies)
-{
- unsigned int orig_len;
- unsigned long ra;
- int i;
-
- if (copy_dir != LDC_COPY_IN && copy_dir != LDC_COPY_OUT) {
- printk(KERN_ERR PFX "ldc_copy: ID[%lu] Bad copy_dir[%d]\n",
- lp->id, copy_dir);
- return -EINVAL;
- }
-
- ra = __pa(buf);
- if ((ra | len | offset) & (8UL - 1)) {
- printk(KERN_ERR PFX "ldc_copy: ID[%lu] Unaligned buffer "
- "ra[%lx] len[%x] offset[%lx]\n",
- lp->id, ra, len, offset);
- return -EFAULT;
- }
-
- if (lp->hs_state != LDC_HS_COMPLETE ||
- (lp->flags & LDC_FLAG_RESET)) {
- printk(KERN_ERR PFX "ldc_copy: ID[%lu] Link down hs_state[%x] "
- "flags[%x]\n", lp->id, lp->hs_state, lp->flags);
- return -ECONNRESET;
- }
-
- orig_len = len;
- for (i = 0; i < ncookies; i++) {
- unsigned long cookie_raddr = cookies[i].cookie_addr;
- unsigned long this_len = cookies[i].cookie_size;
- unsigned long actual_len;
-
- if (unlikely(offset)) {
- unsigned long this_off = offset;
-
- if (this_off > this_len)
- this_off = this_len;
-
- offset -= this_off;
- this_len -= this_off;
- if (!this_len)
- continue;
- cookie_raddr += this_off;
- }
-
- if (this_len > len)
- this_len = len;
-
- while (1) {
- unsigned long hv_err;
-
- hv_err = sun4v_ldc_copy(lp->id, copy_dir,
- cookie_raddr, ra,
- this_len, &actual_len);
- if (unlikely(hv_err)) {
- printk(KERN_ERR PFX "ldc_copy: ID[%lu] "
- "HV error %lu\n",
- lp->id, hv_err);
- if (lp->hs_state != LDC_HS_COMPLETE ||
- (lp->flags & LDC_FLAG_RESET))
- return -ECONNRESET;
- else
- return -EFAULT;
- }
-
- cookie_raddr += actual_len;
- ra += actual_len;
- len -= actual_len;
- if (actual_len == this_len)
- break;
-
- this_len -= actual_len;
- }
-
- if (!len)
- break;
- }
-
- /* It is caller policy what to do about short copies.
- * For example, a networking driver can declare the
- * packet a runt and drop it.
- */
-
- return orig_len - len;
-}
-EXPORT_SYMBOL(ldc_copy);
-
-void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len,
- struct ldc_trans_cookie *cookies, int *ncookies,
- unsigned int map_perm)
-{
- void *buf;
- int err;
-
- if (len & (8UL - 1))
- return ERR_PTR(-EINVAL);
-
- buf = kzalloc(len, GFP_KERNEL);
- if (!buf)
- return ERR_PTR(-ENOMEM);
-
- err = ldc_map_single(lp, buf, len, cookies, *ncookies, map_perm);
- if (err < 0) {
- kfree(buf);
- return ERR_PTR(err);
- }
- *ncookies = err;
-
- return buf;
-}
-EXPORT_SYMBOL(ldc_alloc_exp_dring);
-
-void ldc_free_exp_dring(struct ldc_channel *lp, void *buf, unsigned int len,
- struct ldc_trans_cookie *cookies, int ncookies)
-{
- ldc_unmap(lp, cookies, ncookies);
- kfree(buf);
-}
-EXPORT_SYMBOL(ldc_free_exp_dring);
-
-static int __init ldc_init(void)
-{
- unsigned long major, minor;
- struct mdesc_handle *hp;
- const u64 *v;
- int err;
- u64 mp;
-
- hp = mdesc_grab();
- if (!hp)
- return -ENODEV;
-
- mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
- err = -ENODEV;
- if (mp == MDESC_NODE_NULL)
- goto out;
-
- v = mdesc_get_property(hp, mp, "domaining-enabled", NULL);
- if (!v)
- goto out;
-
- major = 1;
- minor = 0;
- if (sun4v_hvapi_register(HV_GRP_LDOM, major, &minor)) {
- printk(KERN_INFO PFX "Could not register LDOM hvapi.\n");
- goto out;
- }
-
- printk(KERN_INFO "%s", version);
-
- if (!*v) {
- printk(KERN_INFO PFX "Domaining disabled.\n");
- goto out;
- }
- ldom_domaining_enabled = 1;
- err = 0;
-
-out:
- mdesc_release(hp);
- return err;
-}
-
-core_initcall(ldc_init);