![Akinobu Mita](/assets/img/avatar_default.png)
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2370 lines
48 KiB
C
2370 lines
48 KiB
C
/* ldc.c: Logical Domain Channel link-layer protocol driver.
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*
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* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/scatterlist.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/bitmap.h>
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#include <asm/hypervisor.h>
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#include <asm/iommu.h>
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#include <asm/page.h>
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#include <asm/ldc.h>
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#include <asm/mdesc.h>
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#define DRV_MODULE_NAME "ldc"
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#define PFX DRV_MODULE_NAME ": "
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#define DRV_MODULE_VERSION "1.1"
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#define DRV_MODULE_RELDATE "July 22, 2008"
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static char version[] __devinitdata =
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DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
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#define LDC_PACKET_SIZE 64
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/* Packet header layout for unreliable and reliable mode frames.
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* When in RAW mode, packets are simply straight 64-byte payloads
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* with no headers.
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*/
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struct ldc_packet {
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u8 type;
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#define LDC_CTRL 0x01
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#define LDC_DATA 0x02
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#define LDC_ERR 0x10
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u8 stype;
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#define LDC_INFO 0x01
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#define LDC_ACK 0x02
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#define LDC_NACK 0x04
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u8 ctrl;
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#define LDC_VERS 0x01 /* Link Version */
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#define LDC_RTS 0x02 /* Request To Send */
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#define LDC_RTR 0x03 /* Ready To Receive */
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#define LDC_RDX 0x04 /* Ready for Data eXchange */
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#define LDC_CTRL_MSK 0x0f
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u8 env;
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#define LDC_LEN 0x3f
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#define LDC_FRAG_MASK 0xc0
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#define LDC_START 0x40
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#define LDC_STOP 0x80
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u32 seqid;
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union {
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u8 u_data[LDC_PACKET_SIZE - 8];
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struct {
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u32 pad;
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u32 ackid;
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u8 r_data[LDC_PACKET_SIZE - 8 - 8];
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} r;
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} u;
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};
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struct ldc_version {
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u16 major;
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u16 minor;
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};
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/* Ordered from largest major to lowest. */
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static struct ldc_version ver_arr[] = {
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{ .major = 1, .minor = 0 },
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};
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#define LDC_DEFAULT_MTU (4 * LDC_PACKET_SIZE)
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#define LDC_DEFAULT_NUM_ENTRIES (PAGE_SIZE / LDC_PACKET_SIZE)
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struct ldc_channel;
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struct ldc_mode_ops {
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int (*write)(struct ldc_channel *, const void *, unsigned int);
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int (*read)(struct ldc_channel *, void *, unsigned int);
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};
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static const struct ldc_mode_ops raw_ops;
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static const struct ldc_mode_ops nonraw_ops;
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static const struct ldc_mode_ops stream_ops;
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int ldom_domaining_enabled;
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struct ldc_iommu {
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/* Protects arena alloc/free. */
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spinlock_t lock;
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struct iommu_arena arena;
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struct ldc_mtable_entry *page_table;
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};
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struct ldc_channel {
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/* Protects all operations that depend upon channel state. */
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spinlock_t lock;
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unsigned long id;
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u8 *mssbuf;
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u32 mssbuf_len;
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u32 mssbuf_off;
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struct ldc_packet *tx_base;
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unsigned long tx_head;
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unsigned long tx_tail;
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unsigned long tx_num_entries;
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unsigned long tx_ra;
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unsigned long tx_acked;
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struct ldc_packet *rx_base;
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unsigned long rx_head;
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unsigned long rx_tail;
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unsigned long rx_num_entries;
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unsigned long rx_ra;
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u32 rcv_nxt;
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u32 snd_nxt;
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unsigned long chan_state;
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struct ldc_channel_config cfg;
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void *event_arg;
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const struct ldc_mode_ops *mops;
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struct ldc_iommu iommu;
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struct ldc_version ver;
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u8 hs_state;
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#define LDC_HS_CLOSED 0x00
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#define LDC_HS_OPEN 0x01
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#define LDC_HS_GOTVERS 0x02
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#define LDC_HS_SENTRTR 0x03
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#define LDC_HS_GOTRTR 0x04
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#define LDC_HS_COMPLETE 0x10
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u8 flags;
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#define LDC_FLAG_ALLOCED_QUEUES 0x01
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#define LDC_FLAG_REGISTERED_QUEUES 0x02
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#define LDC_FLAG_REGISTERED_IRQS 0x04
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#define LDC_FLAG_RESET 0x10
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u8 mss;
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u8 state;
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#define LDC_IRQ_NAME_MAX 32
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char rx_irq_name[LDC_IRQ_NAME_MAX];
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char tx_irq_name[LDC_IRQ_NAME_MAX];
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struct hlist_head mh_list;
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struct hlist_node list;
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};
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#define ldcdbg(TYPE, f, a...) \
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do { if (lp->cfg.debug & LDC_DEBUG_##TYPE) \
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printk(KERN_INFO PFX "ID[%lu] " f, lp->id, ## a); \
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} while (0)
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static const char *state_to_str(u8 state)
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{
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switch (state) {
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case LDC_STATE_INVALID:
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return "INVALID";
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case LDC_STATE_INIT:
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return "INIT";
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case LDC_STATE_BOUND:
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return "BOUND";
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case LDC_STATE_READY:
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return "READY";
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case LDC_STATE_CONNECTED:
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return "CONNECTED";
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default:
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return "<UNKNOWN>";
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}
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}
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static void ldc_set_state(struct ldc_channel *lp, u8 state)
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{
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ldcdbg(STATE, "STATE (%s) --> (%s)\n",
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state_to_str(lp->state),
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state_to_str(state));
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lp->state = state;
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}
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static unsigned long __advance(unsigned long off, unsigned long num_entries)
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{
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off += LDC_PACKET_SIZE;
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if (off == (num_entries * LDC_PACKET_SIZE))
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off = 0;
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return off;
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}
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static unsigned long rx_advance(struct ldc_channel *lp, unsigned long off)
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{
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return __advance(off, lp->rx_num_entries);
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}
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static unsigned long tx_advance(struct ldc_channel *lp, unsigned long off)
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{
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return __advance(off, lp->tx_num_entries);
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}
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static struct ldc_packet *handshake_get_tx_packet(struct ldc_channel *lp,
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unsigned long *new_tail)
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{
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struct ldc_packet *p;
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unsigned long t;
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t = tx_advance(lp, lp->tx_tail);
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if (t == lp->tx_head)
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return NULL;
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*new_tail = t;
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p = lp->tx_base;
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return p + (lp->tx_tail / LDC_PACKET_SIZE);
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}
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/* When we are in reliable or stream mode, have to track the next packet
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* we haven't gotten an ACK for in the TX queue using tx_acked. We have
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* to be careful not to stomp over the queue past that point. During
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* the handshake, we don't have TX data packets pending in the queue
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* and that's why handshake_get_tx_packet() need not be mindful of
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* lp->tx_acked.
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*/
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static unsigned long head_for_data(struct ldc_channel *lp)
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{
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if (lp->cfg.mode == LDC_MODE_STREAM)
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return lp->tx_acked;
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return lp->tx_head;
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}
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static int tx_has_space_for(struct ldc_channel *lp, unsigned int size)
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{
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unsigned long limit, tail, new_tail, diff;
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unsigned int mss;
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limit = head_for_data(lp);
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tail = lp->tx_tail;
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new_tail = tx_advance(lp, tail);
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if (new_tail == limit)
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return 0;
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if (limit > new_tail)
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diff = limit - new_tail;
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else
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diff = (limit +
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((lp->tx_num_entries * LDC_PACKET_SIZE) - new_tail));
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diff /= LDC_PACKET_SIZE;
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mss = lp->mss;
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if (diff * mss < size)
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return 0;
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return 1;
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}
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static struct ldc_packet *data_get_tx_packet(struct ldc_channel *lp,
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unsigned long *new_tail)
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{
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struct ldc_packet *p;
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unsigned long h, t;
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h = head_for_data(lp);
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t = tx_advance(lp, lp->tx_tail);
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if (t == h)
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return NULL;
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*new_tail = t;
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p = lp->tx_base;
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return p + (lp->tx_tail / LDC_PACKET_SIZE);
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}
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static int set_tx_tail(struct ldc_channel *lp, unsigned long tail)
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{
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unsigned long orig_tail = lp->tx_tail;
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int limit = 1000;
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lp->tx_tail = tail;
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while (limit-- > 0) {
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unsigned long err;
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err = sun4v_ldc_tx_set_qtail(lp->id, tail);
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if (!err)
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return 0;
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if (err != HV_EWOULDBLOCK) {
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lp->tx_tail = orig_tail;
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return -EINVAL;
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}
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udelay(1);
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}
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lp->tx_tail = orig_tail;
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return -EBUSY;
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}
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/* This just updates the head value in the hypervisor using
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* a polling loop with a timeout. The caller takes care of
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* upating software state representing the head change, if any.
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*/
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static int __set_rx_head(struct ldc_channel *lp, unsigned long head)
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{
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int limit = 1000;
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while (limit-- > 0) {
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unsigned long err;
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err = sun4v_ldc_rx_set_qhead(lp->id, head);
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if (!err)
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return 0;
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if (err != HV_EWOULDBLOCK)
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return -EINVAL;
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udelay(1);
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}
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return -EBUSY;
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}
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static int send_tx_packet(struct ldc_channel *lp,
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struct ldc_packet *p,
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unsigned long new_tail)
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{
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BUG_ON(p != (lp->tx_base + (lp->tx_tail / LDC_PACKET_SIZE)));
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return set_tx_tail(lp, new_tail);
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}
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static struct ldc_packet *handshake_compose_ctrl(struct ldc_channel *lp,
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u8 stype, u8 ctrl,
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void *data, int dlen,
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unsigned long *new_tail)
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{
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struct ldc_packet *p = handshake_get_tx_packet(lp, new_tail);
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if (p) {
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memset(p, 0, sizeof(*p));
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p->type = LDC_CTRL;
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p->stype = stype;
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p->ctrl = ctrl;
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if (data)
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memcpy(p->u.u_data, data, dlen);
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}
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return p;
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}
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static int start_handshake(struct ldc_channel *lp)
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{
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struct ldc_packet *p;
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struct ldc_version *ver;
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unsigned long new_tail;
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ver = &ver_arr[0];
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ldcdbg(HS, "SEND VER INFO maj[%u] min[%u]\n",
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ver->major, ver->minor);
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p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS,
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ver, sizeof(*ver), &new_tail);
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if (p) {
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int err = send_tx_packet(lp, p, new_tail);
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if (!err)
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lp->flags &= ~LDC_FLAG_RESET;
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return err;
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}
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return -EBUSY;
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}
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static int send_version_nack(struct ldc_channel *lp,
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u16 major, u16 minor)
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{
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struct ldc_packet *p;
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struct ldc_version ver;
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unsigned long new_tail;
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ver.major = major;
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ver.minor = minor;
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p = handshake_compose_ctrl(lp, LDC_NACK, LDC_VERS,
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&ver, sizeof(ver), &new_tail);
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if (p) {
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ldcdbg(HS, "SEND VER NACK maj[%u] min[%u]\n",
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ver.major, ver.minor);
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return send_tx_packet(lp, p, new_tail);
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}
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return -EBUSY;
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}
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static int send_version_ack(struct ldc_channel *lp,
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struct ldc_version *vp)
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{
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struct ldc_packet *p;
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unsigned long new_tail;
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p = handshake_compose_ctrl(lp, LDC_ACK, LDC_VERS,
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vp, sizeof(*vp), &new_tail);
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if (p) {
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ldcdbg(HS, "SEND VER ACK maj[%u] min[%u]\n",
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vp->major, vp->minor);
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return send_tx_packet(lp, p, new_tail);
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}
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return -EBUSY;
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}
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static int send_rts(struct ldc_channel *lp)
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{
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struct ldc_packet *p;
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unsigned long new_tail;
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p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTS, NULL, 0,
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&new_tail);
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if (p) {
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p->env = lp->cfg.mode;
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p->seqid = 0;
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lp->rcv_nxt = 0;
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ldcdbg(HS, "SEND RTS env[0x%x] seqid[0x%x]\n",
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p->env, p->seqid);
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return send_tx_packet(lp, p, new_tail);
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}
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return -EBUSY;
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}
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static int send_rtr(struct ldc_channel *lp)
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{
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struct ldc_packet *p;
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unsigned long new_tail;
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p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTR, NULL, 0,
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&new_tail);
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if (p) {
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p->env = lp->cfg.mode;
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p->seqid = 0;
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ldcdbg(HS, "SEND RTR env[0x%x] seqid[0x%x]\n",
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p->env, p->seqid);
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return send_tx_packet(lp, p, new_tail);
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}
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return -EBUSY;
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}
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static int send_rdx(struct ldc_channel *lp)
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{
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struct ldc_packet *p;
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unsigned long new_tail;
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p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RDX, NULL, 0,
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&new_tail);
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if (p) {
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p->env = 0;
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p->seqid = ++lp->snd_nxt;
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p->u.r.ackid = lp->rcv_nxt;
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ldcdbg(HS, "SEND RDX env[0x%x] seqid[0x%x] ackid[0x%x]\n",
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p->env, p->seqid, p->u.r.ackid);
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return send_tx_packet(lp, p, new_tail);
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}
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return -EBUSY;
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}
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static int send_data_nack(struct ldc_channel *lp, struct ldc_packet *data_pkt)
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{
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struct ldc_packet *p;
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unsigned long new_tail;
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int err;
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p = data_get_tx_packet(lp, &new_tail);
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if (!p)
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return -EBUSY;
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memset(p, 0, sizeof(*p));
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p->type = data_pkt->type;
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p->stype = LDC_NACK;
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p->ctrl = data_pkt->ctrl & LDC_CTRL_MSK;
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p->seqid = lp->snd_nxt + 1;
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p->u.r.ackid = lp->rcv_nxt;
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ldcdbg(HS, "SEND DATA NACK type[0x%x] ctl[0x%x] seq[0x%x] ack[0x%x]\n",
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p->type, p->ctrl, p->seqid, p->u.r.ackid);
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err = send_tx_packet(lp, p, new_tail);
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if (!err)
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lp->snd_nxt++;
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return err;
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}
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static int ldc_abort(struct ldc_channel *lp)
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{
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unsigned long hv_err;
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ldcdbg(STATE, "ABORT\n");
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/* We report but do not act upon the hypervisor errors because
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* there really isn't much we can do if they fail at this point.
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*/
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hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
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if (hv_err)
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printk(KERN_ERR PFX "ldc_abort: "
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"sun4v_ldc_tx_qconf(%lx,%lx,%lx) failed, err=%lu\n",
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lp->id, lp->tx_ra, lp->tx_num_entries, hv_err);
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hv_err = sun4v_ldc_tx_get_state(lp->id,
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&lp->tx_head,
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&lp->tx_tail,
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&lp->chan_state);
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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;
|
|
struct ldc_packet *p;
|
|
unsigned long new_tail;
|
|
|
|
if (vp->major == 0 && vp->minor == 0)
|
|
return ldc_abort(lp);
|
|
|
|
vap = find_by_major(vp->major);
|
|
if (!vap)
|
|
return ldc_abort(lp);
|
|
|
|
p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS,
|
|
vap, sizeof(*vap),
|
|
&new_tail);
|
|
if (!p)
|
|
return ldc_abort(lp);
|
|
|
|
return send_tx_packet(lp, p, new_tail);
|
|
}
|
|
|
|
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:
|
|
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);
|
|
|
|
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_DISABLED,
|
|
lp->rx_irq_name, lp);
|
|
if (err)
|
|
return err;
|
|
|
|
err = request_irq(lp->cfg.tx_irq, ldc_tx,
|
|
IRQF_SAMPLE_RANDOM | IRQF_DISABLED,
|
|
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, start, end, limit;
|
|
int pass;
|
|
|
|
limit = arena->limit;
|
|
start = arena->hint;
|
|
pass = 0;
|
|
|
|
again:
|
|
n = bitmap_find_next_zero_area(arena->map, limit, start, npages, 0);
|
|
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;
|
|
}
|
|
}
|
|
bitmap_set(arena->map, n, npages);
|
|
|
|
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);
|