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2428 lines
50 KiB
2428 lines
50 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* ldc.c: Logical Domain Channel link-layer protocol driver. |
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* |
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* Copyright (C) 2007, 2008 David S. Miller <[email protected]> |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/export.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/iommu-common.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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#define COOKIE_PGSZ_CODE 0xf000000000000000ULL |
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#define COOKIE_PGSZ_CODE_SHIFT 60ULL |
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static char version[] = |
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DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; |
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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 ldc_unmap. */ |
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spinlock_t lock; |
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struct ldc_mtable_entry *page_table; |
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struct iommu_map_table iommu_map_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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#define LDC_ABORT(lp) ldc_abort((lp), __func__) |
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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 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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return err; |
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} |
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|
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static int ldc_abort(struct ldc_channel *lp, const char *msg) |
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{ |
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unsigned long hv_err; |
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|
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ldcdbg(STATE, "ABORT[%s]\n", msg); |
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ldc_print(lp); |
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|
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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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|
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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) |
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printk(KERN_ERR PFX "ldc_abort: " |
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"sun4v_ldc_tx_get_state(%lx,...) failed, err=%lu\n", |
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lp->id, hv_err); |
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|
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hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_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_rx_qconf(%lx,%lx,%lx) failed, err=%lu\n", |
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lp->id, lp->rx_ra, lp->rx_num_entries, hv_err); |
|
|
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/* Refetch the RX queue state as well, because we could be invoked |
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* here in the queue processing context. |
|
*/ |
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hv_err = sun4v_ldc_rx_get_state(lp->id, |
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&lp->rx_head, |
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&lp->rx_tail, |
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&lp->chan_state); |
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if (hv_err) |
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printk(KERN_ERR PFX "ldc_abort: " |
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"sun4v_ldc_rx_get_state(%lx,...) failed, err=%lu\n", |
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lp->id, hv_err); |
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|
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return -ECONNRESET; |
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} |
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|
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static struct ldc_version *find_by_major(u16 major) |
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{ |
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struct ldc_version *ret = NULL; |
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int i; |
|
|
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for (i = 0; i < ARRAY_SIZE(ver_arr); i++) { |
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struct ldc_version *v = &ver_arr[i]; |
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if (v->major <= major) { |
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ret = v; |
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break; |
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} |
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} |
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return ret; |
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} |
|
|
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static int process_ver_info(struct ldc_channel *lp, struct ldc_version *vp) |
|
{ |
|
struct ldc_version *vap; |
|
int err; |
|
|
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ldcdbg(HS, "GOT VERSION INFO major[%x] minor[%x]\n", |
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vp->major, vp->minor); |
|
|
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if (lp->hs_state == LDC_HS_GOTVERS) { |
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lp->hs_state = LDC_HS_OPEN; |
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memset(&lp->ver, 0, sizeof(lp->ver)); |
|
} |
|
|
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vap = find_by_major(vp->major); |
|
if (!vap) { |
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err = send_version_nack(lp, 0, 0); |
|
} else if (vap->major != vp->major) { |
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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, flags; |
|
unsigned int event_mask; |
|
|
|
spin_lock_irqsave(&lp->lock, flags); |
|
|
|
orig_state = lp->chan_state; |
|
|
|
/* We should probably check for hypervisor errors here and |
|
* reset the LDC channel if we get one. |
|
*/ |
|
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); |
|
|
|
/* |
|
* Generate an LDC_EVENT_UP event if the channel |
|
* was not already up. |
|
*/ |
|
if (orig_state != LDC_CHANNEL_UP) { |
|
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) ldc_rx_reset(lp); |
|
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, orig_state; |
|
unsigned int event_mask = 0; |
|
|
|
spin_lock_irqsave(&lp->lock, flags); |
|
|
|
orig_state = lp->chan_state; |
|
|
|
/* We should probably check for hypervisor errors here and |
|
* reset the LDC channel if we get one. |
|
*/ |
|
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); |
|
|
|
/* |
|
* Generate an LDC_EVENT_UP event if the channel |
|
* was not already up. |
|
*/ |
|
if (orig_state != LDC_CHANNEL_UP) { |
|
event_mask |= LDC_EVENT_UP; |
|
orig_state = lp->chan_state; |
|
} |
|
} |
|
|
|
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; |
|
|
|
hlist_for_each_entry(lp, &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); |
|
} |
|
|
|
static unsigned long ldc_cookie_to_index(u64 cookie, void *arg) |
|
{ |
|
u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT; |
|
/* struct ldc_iommu *ldc_iommu = (struct ldc_iommu *)arg; */ |
|
|
|
cookie &= ~COOKIE_PGSZ_CODE; |
|
|
|
return (cookie >> (13ULL + (szcode * 3ULL))); |
|
} |
|
|
|
static void ldc_demap(struct ldc_iommu *iommu, unsigned long id, u64 cookie, |
|
unsigned long entry, unsigned long npages) |
|
{ |
|
struct ldc_mtable_entry *base; |
|
unsigned long i, shift; |
|
|
|
shift = (cookie >> COOKIE_PGSZ_CODE_SHIFT) * 3; |
|
base = iommu->page_table + entry; |
|
for (i = 0; i < npages; i++) { |
|
if (base->cookie) |
|
sun4v_ldc_revoke(id, cookie + (i << shift), |
|
base->cookie); |
|
base->mte = 0; |
|
} |
|
} |
|
|
|
/* XXX Make this configurable... XXX */ |
|
#define LDC_IOTABLE_SIZE (8 * 1024) |
|
|
|
static int ldc_iommu_init(const char *name, struct ldc_channel *lp) |
|
{ |
|
unsigned long sz, num_tsb_entries, tsbsize, order; |
|
struct ldc_iommu *ldc_iommu = &lp->iommu; |
|
struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table; |
|
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(&ldc_iommu->lock); |
|
|
|
sz = num_tsb_entries / 8; |
|
sz = (sz + 7UL) & ~7UL; |
|
iommu->map = kzalloc(sz, GFP_KERNEL); |
|
if (!iommu->map) { |
|
printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz); |
|
return -ENOMEM; |
|
} |
|
iommu_tbl_pool_init(iommu, num_tsb_entries, PAGE_SHIFT, |
|
NULL, false /* no large pool */, |
|
1 /* npools */, |
|
true /* skip span boundary check */); |
|
|
|
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); |
|
|
|
ldc_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); |
|
ldc_iommu->page_table = NULL; |
|
|
|
out_free_map: |
|
kfree(iommu->map); |
|
iommu->map = NULL; |
|
|
|
return err; |
|
} |
|
|
|
static void ldc_iommu_release(struct ldc_channel *lp) |
|
{ |
|
struct ldc_iommu *ldc_iommu = &lp->iommu; |
|
struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table; |
|
unsigned long num_tsb_entries, tsbsize, order; |
|
|
|
(void) sun4v_ldc_set_map_table(lp->id, 0, 0); |
|
|
|
num_tsb_entries = iommu->poolsize * iommu->nr_pools; |
|
tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); |
|
order = get_order(tsbsize); |
|
|
|
free_pages((unsigned long) ldc_iommu->page_table, order); |
|
ldc_iommu->page_table = NULL; |
|
|
|
kfree(iommu->map); |
|
iommu->map = NULL; |
|
} |
|
|
|
struct ldc_channel *ldc_alloc(unsigned long id, |
|
const struct ldc_channel_config *cfgp, |
|
void *event_arg, |
|
const char *name) |
|
{ |
|
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; |
|
if (!name) |
|
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(name, 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); |
|
|
|
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, 0, |
|
lp->rx_irq_name, lp); |
|
if (err) |
|
goto out_free_txq; |
|
|
|
err = request_irq(lp->cfg.tx_irq, ldc_tx, 0, |
|
lp->tx_irq_name, lp); |
|
if (err) { |
|
free_irq(lp->cfg.rx_irq, lp); |
|
goto out_free_txq; |
|
} |
|
|
|
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_unbind(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); |
|
lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; |
|
} |
|
|
|
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; |
|
} |
|
|
|
ldc_set_state(lp, LDC_STATE_INIT); |
|
} |
|
EXPORT_SYMBOL(ldc_unbind); |
|
|
|
void ldc_free(struct ldc_channel *lp) |
|
{ |
|
ldc_unbind(lp); |
|
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) |
|
{ |
|
unsigned long hv_err, flags; |
|
int err = -EINVAL; |
|
|
|
if (lp->state != LDC_STATE_INIT) |
|
return -EINVAL; |
|
|
|
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); |
|
|
|
if (lp->cfg.mode == LDC_MODE_RAW) { |
|
/* |
|
* There is no handshake in RAW mode, so handshake |
|
* is completed. |
|
*/ |
|
lp->hs_state = LDC_HS_COMPLETE; |
|
} |
|
|
|
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 = ((lp->hs_state > LDC_HS_OPEN) ? 0 : -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); |
|
|
|
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; |
|
} |
|
EXPORT_SYMBOL(ldc_set_state); |
|
|
|
int ldc_mode(struct ldc_channel *lp) |
|
{ |
|
return lp->cfg.mode; |
|
} |
|
EXPORT_SYMBOL(ldc_mode); |
|
|
|
int ldc_rx_reset(struct ldc_channel *lp) |
|
{ |
|
return __set_rx_head(lp, lp->rx_tail); |
|
} |
|
EXPORT_SYMBOL(ldc_rx_reset); |
|
|
|
void __ldc_print(struct ldc_channel *lp, const char *caller) |
|
{ |
|
pr_info("%s: id=0x%lx flags=0x%x state=%s cstate=0x%lx hsstate=0x%x\n" |
|
"\trx_h=0x%lx rx_t=0x%lx rx_n=%ld\n" |
|
"\ttx_h=0x%lx tx_t=0x%lx tx_n=%ld\n" |
|
"\trcv_nxt=%u snd_nxt=%u\n", |
|
caller, lp->id, lp->flags, state_to_str(lp->state), |
|
lp->chan_state, lp->hs_state, |
|
lp->rx_head, lp->rx_tail, lp->rx_num_entries, |
|
lp->tx_head, lp->tx_tail, lp->tx_num_entries, |
|
lp->rcv_nxt, lp->snd_nxt); |
|
} |
|
EXPORT_SYMBOL(__ldc_print); |
|
|
|
static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size) |
|
{ |
|
struct ldc_packet *p; |
|
unsigned long new_tail, hv_err; |
|
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 (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 = ldc_rx_reset(lp); |
|
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 this is a control-only packet, there is nothing |
|
* else to do but advance the rx queue since the packet |
|
* was already processed above. |
|
*/ |
|
if (!(p->type & LDC_DATA)) { |
|
new = rx_advance(lp, new); |
|
break; |
|
} |
|
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; |
|
|
|
ldcdbg(RX, "%s: entered size=%d\n", __func__, size); |
|
|
|
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); |
|
|
|
ldcdbg(RX, "%s: mode=%d, head=%lu, tail=%lu rv=%d\n", __func__, |
|
lp->cfg.mode, lp->rx_head, lp->rx_tail, err); |
|
|
|
return err; |
|
} |
|
EXPORT_SYMBOL(ldc_read); |
|
|
|
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 struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu, |
|
unsigned long npages) |
|
{ |
|
long entry; |
|
|
|
entry = iommu_tbl_range_alloc(NULL, &iommu->iommu_map_table, |
|
npages, NULL, (unsigned long)-1, 0); |
|
if (unlikely(entry == IOMMU_ERROR_CODE)) |
|
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; |
|
struct ldc_mtable_entry *base; |
|
struct cookie_state state; |
|
struct ldc_iommu *iommu; |
|
int err; |
|
struct scatterlist *s; |
|
|
|
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; |
|
|
|
base = alloc_npages(iommu, npages); |
|
|
|
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_each_sg(sg, s, num_sg, i) { |
|
fill_cookies(&state, page_to_pfn(sg_page(s)) << PAGE_SHIFT, |
|
s->offset, s->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; |
|
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; |
|
|
|
base = alloc_npages(iommu, npages); |
|
|
|
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 > ncookies); |
|
|
|
return state.nc; |
|
} |
|
EXPORT_SYMBOL(ldc_map_single); |
|
|
|
|
|
static void free_npages(unsigned long id, struct ldc_iommu *iommu, |
|
u64 cookie, u64 size) |
|
{ |
|
unsigned long npages, entry; |
|
|
|
npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT; |
|
|
|
entry = ldc_cookie_to_index(cookie, iommu); |
|
ldc_demap(iommu, id, cookie, entry, npages); |
|
iommu_tbl_range_free(&iommu->iommu_map_table, cookie, npages, entry); |
|
} |
|
|
|
void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies, |
|
int ncookies) |
|
{ |
|
struct ldc_iommu *iommu = &lp->iommu; |
|
int i; |
|
unsigned long flags; |
|
|
|
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_ATOMIC); |
|
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);
|
|
|