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![Stefan Richter](/assets/img/avatar_default.png)
hpsb_read, hpsb_write, hpsb_lock are sleeping functions which nobody is in danger to use in atomic context. Besides, in_interrupt does not cover all types of atomic context. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
595 lines
14 KiB
C
595 lines
14 KiB
C
/*
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* IEEE 1394 for Linux
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*
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* Transaction support.
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*
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* Copyright (C) 1999 Andreas E. Bombe
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*
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* This code is licensed under the GPL. See the file COPYING in the root
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* directory of the kernel sources for details.
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*/
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#include <linux/bitops.h>
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#include <linux/compiler.h>
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#include <linux/hardirq.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/sched.h> /* because linux/wait.h is broken if CONFIG_SMP=n */
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#include <linux/wait.h>
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#include <asm/bug.h>
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#include <asm/errno.h>
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#include <asm/system.h>
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#include "ieee1394.h"
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#include "ieee1394_types.h"
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#include "hosts.h"
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#include "ieee1394_core.h"
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#include "ieee1394_transactions.h"
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#define PREP_ASYNC_HEAD_ADDRESS(tc) \
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packet->tcode = tc; \
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packet->header[0] = (packet->node_id << 16) | (packet->tlabel << 10) \
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| (1 << 8) | (tc << 4); \
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packet->header[1] = (packet->host->node_id << 16) | (addr >> 32); \
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packet->header[2] = addr & 0xffffffff
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#ifndef HPSB_DEBUG_TLABELS
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static
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#endif
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DEFINE_SPINLOCK(hpsb_tlabel_lock);
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static DECLARE_WAIT_QUEUE_HEAD(tlabel_wq);
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static void fill_async_readquad(struct hpsb_packet *packet, u64 addr)
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{
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PREP_ASYNC_HEAD_ADDRESS(TCODE_READQ);
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packet->header_size = 12;
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packet->data_size = 0;
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packet->expect_response = 1;
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}
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static void fill_async_readblock(struct hpsb_packet *packet, u64 addr,
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int length)
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{
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PREP_ASYNC_HEAD_ADDRESS(TCODE_READB);
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packet->header[3] = length << 16;
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packet->header_size = 16;
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packet->data_size = 0;
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packet->expect_response = 1;
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}
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static void fill_async_writequad(struct hpsb_packet *packet, u64 addr,
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quadlet_t data)
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{
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PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEQ);
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packet->header[3] = data;
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packet->header_size = 16;
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packet->data_size = 0;
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packet->expect_response = 1;
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}
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static void fill_async_writeblock(struct hpsb_packet *packet, u64 addr,
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int length)
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{
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PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEB);
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packet->header[3] = length << 16;
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packet->header_size = 16;
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packet->expect_response = 1;
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packet->data_size = length + (length % 4 ? 4 - (length % 4) : 0);
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}
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static void fill_async_lock(struct hpsb_packet *packet, u64 addr, int extcode,
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int length)
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{
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PREP_ASYNC_HEAD_ADDRESS(TCODE_LOCK_REQUEST);
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packet->header[3] = (length << 16) | extcode;
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packet->header_size = 16;
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packet->data_size = length;
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packet->expect_response = 1;
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}
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static void fill_phy_packet(struct hpsb_packet *packet, quadlet_t data)
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{
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packet->header[0] = data;
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packet->header[1] = ~data;
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packet->header_size = 8;
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packet->data_size = 0;
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packet->expect_response = 0;
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packet->type = hpsb_raw; /* No CRC added */
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packet->speed_code = IEEE1394_SPEED_100; /* Force speed to be 100Mbps */
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}
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static void fill_async_stream_packet(struct hpsb_packet *packet, int length,
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int channel, int tag, int sync)
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{
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packet->header[0] = (length << 16) | (tag << 14) | (channel << 8)
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| (TCODE_STREAM_DATA << 4) | sync;
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packet->header_size = 4;
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packet->data_size = length;
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packet->type = hpsb_async;
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packet->tcode = TCODE_ISO_DATA;
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}
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/* same as hpsb_get_tlabel, except that it returns immediately */
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static int hpsb_get_tlabel_atomic(struct hpsb_packet *packet)
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{
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unsigned long flags, *tp;
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u8 *next;
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int tlabel, n = NODEID_TO_NODE(packet->node_id);
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/* Broadcast transactions are complete once the request has been sent.
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* Use the same transaction label for all broadcast transactions. */
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if (unlikely(n == ALL_NODES)) {
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packet->tlabel = 0;
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return 0;
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}
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tp = packet->host->tl_pool[n].map;
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next = &packet->host->next_tl[n];
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spin_lock_irqsave(&hpsb_tlabel_lock, flags);
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tlabel = find_next_zero_bit(tp, 64, *next);
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if (tlabel > 63)
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tlabel = find_first_zero_bit(tp, 64);
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if (tlabel > 63) {
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spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
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return -EAGAIN;
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}
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__set_bit(tlabel, tp);
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*next = (tlabel + 1) & 63;
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spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
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packet->tlabel = tlabel;
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return 0;
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}
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/**
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* hpsb_get_tlabel - allocate a transaction label
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* @packet: the packet whose tlabel and tl_pool we set
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*
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* Every asynchronous transaction on the 1394 bus needs a transaction
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* label to match the response to the request. This label has to be
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* different from any other transaction label in an outstanding request to
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* the same node to make matching possible without ambiguity.
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*
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* There are 64 different tlabels, so an allocated tlabel has to be freed
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* with hpsb_free_tlabel() after the transaction is complete (unless it's
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* reused again for the same target node).
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*
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* Return value: Zero on success, otherwise non-zero. A non-zero return
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* generally means there are no available tlabels. If this is called out
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* of interrupt or atomic context, then it will sleep until can return a
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* tlabel or a signal is received.
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*/
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int hpsb_get_tlabel(struct hpsb_packet *packet)
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{
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if (irqs_disabled() || in_atomic())
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return hpsb_get_tlabel_atomic(packet);
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/* NB: The macro wait_event_interruptible() is called with a condition
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* argument with side effect. This is only possible because the side
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* effect does not occur until the condition became true, and
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* wait_event_interruptible() won't evaluate the condition again after
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* that. */
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return wait_event_interruptible(tlabel_wq,
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!hpsb_get_tlabel_atomic(packet));
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}
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/**
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* hpsb_free_tlabel - free an allocated transaction label
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* @packet: packet whose tlabel and tl_pool needs to be cleared
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*
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* Frees the transaction label allocated with hpsb_get_tlabel(). The
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* tlabel has to be freed after the transaction is complete (i.e. response
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* was received for a split transaction or packet was sent for a unified
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* transaction).
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*
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* A tlabel must not be freed twice.
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*/
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void hpsb_free_tlabel(struct hpsb_packet *packet)
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{
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unsigned long flags, *tp;
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int tlabel, n = NODEID_TO_NODE(packet->node_id);
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if (unlikely(n == ALL_NODES))
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return;
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tp = packet->host->tl_pool[n].map;
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tlabel = packet->tlabel;
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BUG_ON(tlabel > 63 || tlabel < 0);
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spin_lock_irqsave(&hpsb_tlabel_lock, flags);
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BUG_ON(!__test_and_clear_bit(tlabel, tp));
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spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
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wake_up_interruptible(&tlabel_wq);
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}
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/**
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* hpsb_packet_success - Make sense of the ack and reply codes
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*
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* Make sense of the ack and reply codes and return more convenient error codes:
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* 0 = success. -%EBUSY = node is busy, try again. -%EAGAIN = error which can
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* probably resolved by retry. -%EREMOTEIO = node suffers from an internal
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* error. -%EACCES = this transaction is not allowed on requested address.
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* -%EINVAL = invalid address at node.
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*/
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int hpsb_packet_success(struct hpsb_packet *packet)
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{
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switch (packet->ack_code) {
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case ACK_PENDING:
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switch ((packet->header[1] >> 12) & 0xf) {
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case RCODE_COMPLETE:
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return 0;
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case RCODE_CONFLICT_ERROR:
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return -EAGAIN;
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case RCODE_DATA_ERROR:
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return -EREMOTEIO;
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case RCODE_TYPE_ERROR:
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return -EACCES;
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case RCODE_ADDRESS_ERROR:
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return -EINVAL;
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default:
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HPSB_ERR("received reserved rcode %d from node %d",
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(packet->header[1] >> 12) & 0xf,
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packet->node_id);
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return -EAGAIN;
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}
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case ACK_BUSY_X:
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case ACK_BUSY_A:
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case ACK_BUSY_B:
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return -EBUSY;
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case ACK_TYPE_ERROR:
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return -EACCES;
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case ACK_COMPLETE:
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if (packet->tcode == TCODE_WRITEQ
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|| packet->tcode == TCODE_WRITEB) {
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return 0;
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} else {
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HPSB_ERR("impossible ack_complete from node %d "
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"(tcode %d)", packet->node_id, packet->tcode);
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return -EAGAIN;
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}
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case ACK_DATA_ERROR:
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if (packet->tcode == TCODE_WRITEB
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|| packet->tcode == TCODE_LOCK_REQUEST) {
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return -EAGAIN;
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} else {
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HPSB_ERR("impossible ack_data_error from node %d "
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"(tcode %d)", packet->node_id, packet->tcode);
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return -EAGAIN;
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}
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case ACK_ADDRESS_ERROR:
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return -EINVAL;
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case ACK_TARDY:
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case ACK_CONFLICT_ERROR:
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case ACKX_NONE:
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case ACKX_SEND_ERROR:
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case ACKX_ABORTED:
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case ACKX_TIMEOUT:
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/* error while sending */
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return -EAGAIN;
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default:
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HPSB_ERR("got invalid ack %d from node %d (tcode %d)",
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packet->ack_code, packet->node_id, packet->tcode);
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return -EAGAIN;
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}
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}
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struct hpsb_packet *hpsb_make_readpacket(struct hpsb_host *host, nodeid_t node,
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u64 addr, size_t length)
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{
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struct hpsb_packet *packet;
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if (length == 0)
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return NULL;
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packet = hpsb_alloc_packet(length);
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if (!packet)
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return NULL;
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packet->host = host;
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packet->node_id = node;
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if (hpsb_get_tlabel(packet)) {
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hpsb_free_packet(packet);
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return NULL;
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}
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if (length == 4)
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fill_async_readquad(packet, addr);
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else
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fill_async_readblock(packet, addr, length);
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return packet;
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}
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struct hpsb_packet *hpsb_make_writepacket(struct hpsb_host *host, nodeid_t node,
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u64 addr, quadlet_t * buffer,
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size_t length)
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{
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struct hpsb_packet *packet;
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if (length == 0)
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return NULL;
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packet = hpsb_alloc_packet(length);
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if (!packet)
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return NULL;
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if (length % 4) { /* zero padding bytes */
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packet->data[length >> 2] = 0;
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}
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packet->host = host;
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packet->node_id = node;
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if (hpsb_get_tlabel(packet)) {
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hpsb_free_packet(packet);
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return NULL;
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}
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if (length == 4) {
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fill_async_writequad(packet, addr, buffer ? *buffer : 0);
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} else {
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fill_async_writeblock(packet, addr, length);
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if (buffer)
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memcpy(packet->data, buffer, length);
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}
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return packet;
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}
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struct hpsb_packet *hpsb_make_streampacket(struct hpsb_host *host, u8 * buffer,
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int length, int channel, int tag,
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int sync)
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{
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struct hpsb_packet *packet;
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if (length == 0)
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return NULL;
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packet = hpsb_alloc_packet(length);
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if (!packet)
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return NULL;
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if (length % 4) { /* zero padding bytes */
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packet->data[length >> 2] = 0;
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}
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packet->host = host;
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/* Because it is too difficult to determine all PHY speeds and link
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* speeds here, we use S100... */
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packet->speed_code = IEEE1394_SPEED_100;
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/* ...and prevent hpsb_send_packet() from overriding it. */
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packet->node_id = LOCAL_BUS | ALL_NODES;
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if (hpsb_get_tlabel(packet)) {
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hpsb_free_packet(packet);
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return NULL;
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}
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fill_async_stream_packet(packet, length, channel, tag, sync);
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if (buffer)
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memcpy(packet->data, buffer, length);
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return packet;
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}
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struct hpsb_packet *hpsb_make_lockpacket(struct hpsb_host *host, nodeid_t node,
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u64 addr, int extcode,
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quadlet_t * data, quadlet_t arg)
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{
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struct hpsb_packet *p;
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u32 length;
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p = hpsb_alloc_packet(8);
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if (!p)
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return NULL;
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p->host = host;
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p->node_id = node;
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if (hpsb_get_tlabel(p)) {
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hpsb_free_packet(p);
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return NULL;
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}
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switch (extcode) {
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case EXTCODE_FETCH_ADD:
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case EXTCODE_LITTLE_ADD:
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length = 4;
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if (data)
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p->data[0] = *data;
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break;
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default:
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length = 8;
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if (data) {
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p->data[0] = arg;
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p->data[1] = *data;
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}
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break;
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}
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fill_async_lock(p, addr, extcode, length);
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return p;
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}
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struct hpsb_packet *hpsb_make_lock64packet(struct hpsb_host *host,
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nodeid_t node, u64 addr, int extcode,
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octlet_t * data, octlet_t arg)
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{
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struct hpsb_packet *p;
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u32 length;
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p = hpsb_alloc_packet(16);
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if (!p)
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return NULL;
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p->host = host;
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p->node_id = node;
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if (hpsb_get_tlabel(p)) {
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hpsb_free_packet(p);
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return NULL;
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}
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switch (extcode) {
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case EXTCODE_FETCH_ADD:
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case EXTCODE_LITTLE_ADD:
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length = 8;
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if (data) {
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p->data[0] = *data >> 32;
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p->data[1] = *data & 0xffffffff;
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}
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break;
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default:
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length = 16;
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if (data) {
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p->data[0] = arg >> 32;
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p->data[1] = arg & 0xffffffff;
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p->data[2] = *data >> 32;
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p->data[3] = *data & 0xffffffff;
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}
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break;
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}
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fill_async_lock(p, addr, extcode, length);
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return p;
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}
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struct hpsb_packet *hpsb_make_phypacket(struct hpsb_host *host, quadlet_t data)
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{
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struct hpsb_packet *p;
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p = hpsb_alloc_packet(0);
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if (!p)
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return NULL;
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p->host = host;
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fill_phy_packet(p, data);
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return p;
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}
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/*
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* FIXME - these functions should probably read from / write to user space to
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* avoid in kernel buffers for user space callers
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*/
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/**
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* hpsb_read - generic read function
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*
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* Recognizes the local node ID and act accordingly. Automatically uses a
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* quadlet read request if @length == 4 and and a block read request otherwise.
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* It does not yet support lengths that are not a multiple of 4.
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*
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* You must explicitly specifiy the @generation for which the node ID is valid,
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* to avoid sending packets to the wrong nodes when we race with a bus reset.
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*/
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int hpsb_read(struct hpsb_host *host, nodeid_t node, unsigned int generation,
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u64 addr, quadlet_t * buffer, size_t length)
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{
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struct hpsb_packet *packet;
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int retval = 0;
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if (length == 0)
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return -EINVAL;
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packet = hpsb_make_readpacket(host, node, addr, length);
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if (!packet) {
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return -ENOMEM;
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}
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packet->generation = generation;
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retval = hpsb_send_packet_and_wait(packet);
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if (retval < 0)
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goto hpsb_read_fail;
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retval = hpsb_packet_success(packet);
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if (retval == 0) {
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if (length == 4) {
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*buffer = packet->header[3];
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} else {
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memcpy(buffer, packet->data, length);
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}
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}
|
|
|
|
hpsb_read_fail:
|
|
hpsb_free_tlabel(packet);
|
|
hpsb_free_packet(packet);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* hpsb_write - generic write function
|
|
*
|
|
* Recognizes the local node ID and act accordingly. Automatically uses a
|
|
* quadlet write request if @length == 4 and and a block write request
|
|
* otherwise. It does not yet support lengths that are not a multiple of 4.
|
|
*
|
|
* You must explicitly specifiy the @generation for which the node ID is valid,
|
|
* to avoid sending packets to the wrong nodes when we race with a bus reset.
|
|
*/
|
|
int hpsb_write(struct hpsb_host *host, nodeid_t node, unsigned int generation,
|
|
u64 addr, quadlet_t * buffer, size_t length)
|
|
{
|
|
struct hpsb_packet *packet;
|
|
int retval;
|
|
|
|
if (length == 0)
|
|
return -EINVAL;
|
|
|
|
packet = hpsb_make_writepacket(host, node, addr, buffer, length);
|
|
|
|
if (!packet)
|
|
return -ENOMEM;
|
|
|
|
packet->generation = generation;
|
|
retval = hpsb_send_packet_and_wait(packet);
|
|
if (retval < 0)
|
|
goto hpsb_write_fail;
|
|
|
|
retval = hpsb_packet_success(packet);
|
|
|
|
hpsb_write_fail:
|
|
hpsb_free_tlabel(packet);
|
|
hpsb_free_packet(packet);
|
|
|
|
return retval;
|
|
}
|
|
|
|
int hpsb_lock(struct hpsb_host *host, nodeid_t node, unsigned int generation,
|
|
u64 addr, int extcode, quadlet_t *data, quadlet_t arg)
|
|
{
|
|
struct hpsb_packet *packet;
|
|
int retval = 0;
|
|
|
|
packet = hpsb_make_lockpacket(host, node, addr, extcode, data, arg);
|
|
if (!packet)
|
|
return -ENOMEM;
|
|
|
|
packet->generation = generation;
|
|
retval = hpsb_send_packet_and_wait(packet);
|
|
if (retval < 0)
|
|
goto hpsb_lock_fail;
|
|
|
|
retval = hpsb_packet_success(packet);
|
|
|
|
if (retval == 0)
|
|
*data = packet->data[0];
|
|
|
|
hpsb_lock_fail:
|
|
hpsb_free_tlabel(packet);
|
|
hpsb_free_packet(packet);
|
|
|
|
return retval;
|
|
}
|