476 строки
13 KiB
C
476 строки
13 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2000-2007 Silicon Graphics, Inc. All Rights Reserved.
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*/
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#include <linux/module.h>
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#include <asm/sn/nodepda.h>
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#include <asm/sn/addrs.h>
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#include <asm/sn/arch.h>
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#include <asm/sn/sn_cpuid.h>
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#include <asm/sn/pda.h>
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#include <asm/sn/shubio.h>
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#include <asm/nodedata.h>
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#include <asm/delay.h>
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#include <linux/memblock.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <asm/sn/bte.h>
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#ifndef L1_CACHE_MASK
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#define L1_CACHE_MASK (L1_CACHE_BYTES - 1)
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#endif
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/* two interfaces on two btes */
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#define MAX_INTERFACES_TO_TRY 4
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#define MAX_NODES_TO_TRY 2
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static struct bteinfo_s *bte_if_on_node(nasid_t nasid, int interface)
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{
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nodepda_t *tmp_nodepda;
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if (nasid_to_cnodeid(nasid) == -1)
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return (struct bteinfo_s *)NULL;
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tmp_nodepda = NODEPDA(nasid_to_cnodeid(nasid));
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return &tmp_nodepda->bte_if[interface];
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}
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static inline void bte_start_transfer(struct bteinfo_s *bte, u64 len, u64 mode)
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{
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if (is_shub2()) {
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BTE_CTRL_STORE(bte, (IBLS_BUSY | ((len) | (mode) << 24)));
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} else {
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BTE_LNSTAT_STORE(bte, len);
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BTE_CTRL_STORE(bte, mode);
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}
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}
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/************************************************************************
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* Block Transfer Engine copy related functions.
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*
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***********************************************************************/
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/*
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* bte_copy(src, dest, len, mode, notification)
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*
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* Use the block transfer engine to move kernel memory from src to dest
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* using the assigned mode.
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*
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* Parameters:
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* src - physical address of the transfer source.
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* dest - physical address of the transfer destination.
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* len - number of bytes to transfer from source to dest.
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* mode - hardware defined. See reference information
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* for IBCT0/1 in the SHUB Programmers Reference
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* notification - kernel virtual address of the notification cache
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* line. If NULL, the default is used and
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* the bte_copy is synchronous.
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*
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* NOTE: This function requires src, dest, and len to
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* be cacheline aligned.
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*/
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bte_result_t bte_copy(u64 src, u64 dest, u64 len, u64 mode, void *notification)
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{
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u64 transfer_size;
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u64 transfer_stat;
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u64 notif_phys_addr;
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struct bteinfo_s *bte;
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bte_result_t bte_status;
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unsigned long irq_flags;
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unsigned long itc_end = 0;
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int nasid_to_try[MAX_NODES_TO_TRY];
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int my_nasid = cpuid_to_nasid(raw_smp_processor_id());
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int bte_if_index, nasid_index;
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int bte_first, btes_per_node = BTES_PER_NODE;
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BTE_PRINTK(("bte_copy(0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%p)\n",
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src, dest, len, mode, notification));
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if (len == 0) {
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return BTE_SUCCESS;
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}
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BUG_ON(len & L1_CACHE_MASK);
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BUG_ON(src & L1_CACHE_MASK);
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BUG_ON(dest & L1_CACHE_MASK);
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BUG_ON(len > BTE_MAX_XFER);
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/*
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* Start with interface corresponding to cpu number
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*/
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bte_first = raw_smp_processor_id() % btes_per_node;
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if (mode & BTE_USE_DEST) {
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/* try remote then local */
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nasid_to_try[0] = NASID_GET(dest);
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if (mode & BTE_USE_ANY) {
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nasid_to_try[1] = my_nasid;
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} else {
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nasid_to_try[1] = 0;
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}
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} else {
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/* try local then remote */
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nasid_to_try[0] = my_nasid;
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if (mode & BTE_USE_ANY) {
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nasid_to_try[1] = NASID_GET(dest);
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} else {
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nasid_to_try[1] = 0;
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}
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}
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retry_bteop:
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do {
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local_irq_save(irq_flags);
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bte_if_index = bte_first;
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nasid_index = 0;
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/* Attempt to lock one of the BTE interfaces. */
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while (nasid_index < MAX_NODES_TO_TRY) {
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bte = bte_if_on_node(nasid_to_try[nasid_index],bte_if_index);
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if (bte == NULL) {
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nasid_index++;
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continue;
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}
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if (spin_trylock(&bte->spinlock)) {
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if (!(*bte->most_rcnt_na & BTE_WORD_AVAILABLE) ||
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(BTE_LNSTAT_LOAD(bte) & BTE_ACTIVE)) {
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/* Got the lock but BTE still busy */
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spin_unlock(&bte->spinlock);
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} else {
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/* we got the lock and it's not busy */
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break;
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}
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}
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bte_if_index = (bte_if_index + 1) % btes_per_node; /* Next interface */
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if (bte_if_index == bte_first) {
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/*
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* We've tried all interfaces on this node
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*/
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nasid_index++;
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}
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bte = NULL;
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}
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if (bte != NULL) {
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break;
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}
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local_irq_restore(irq_flags);
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if (!(mode & BTE_WACQUIRE)) {
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return BTEFAIL_NOTAVAIL;
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}
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} while (1);
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if (notification == NULL) {
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/* User does not want to be notified. */
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bte->most_rcnt_na = &bte->notify;
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} else {
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bte->most_rcnt_na = notification;
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}
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/* Calculate the number of cache lines to transfer. */
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transfer_size = ((len >> L1_CACHE_SHIFT) & BTE_LEN_MASK);
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/* Initialize the notification to a known value. */
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*bte->most_rcnt_na = BTE_WORD_BUSY;
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notif_phys_addr = (u64)bte->most_rcnt_na;
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/* Set the source and destination registers */
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BTE_PRINTKV(("IBSA = 0x%lx)\n", src));
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BTE_SRC_STORE(bte, src);
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BTE_PRINTKV(("IBDA = 0x%lx)\n", dest));
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BTE_DEST_STORE(bte, dest);
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/* Set the notification register */
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BTE_PRINTKV(("IBNA = 0x%lx)\n", notif_phys_addr));
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BTE_NOTIF_STORE(bte, notif_phys_addr);
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/* Initiate the transfer */
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BTE_PRINTK(("IBCT = 0x%lx)\n", BTE_VALID_MODE(mode)));
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bte_start_transfer(bte, transfer_size, BTE_VALID_MODE(mode));
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itc_end = ia64_get_itc() + (40000000 * local_cpu_data->cyc_per_usec);
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spin_unlock_irqrestore(&bte->spinlock, irq_flags);
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if (notification != NULL) {
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return BTE_SUCCESS;
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}
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while ((transfer_stat = *bte->most_rcnt_na) == BTE_WORD_BUSY) {
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cpu_relax();
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if (ia64_get_itc() > itc_end) {
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BTE_PRINTK(("BTE timeout nasid 0x%x bte%d IBLS = 0x%lx na 0x%lx\n",
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NASID_GET(bte->bte_base_addr), bte->bte_num,
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BTE_LNSTAT_LOAD(bte), *bte->most_rcnt_na) );
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bte->bte_error_count++;
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bte->bh_error = IBLS_ERROR;
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bte_error_handler(NODEPDA(bte->bte_cnode));
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*bte->most_rcnt_na = BTE_WORD_AVAILABLE;
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goto retry_bteop;
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}
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}
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BTE_PRINTKV((" Delay Done. IBLS = 0x%lx, most_rcnt_na = 0x%lx\n",
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BTE_LNSTAT_LOAD(bte), *bte->most_rcnt_na));
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if (transfer_stat & IBLS_ERROR) {
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bte_status = BTE_GET_ERROR_STATUS(transfer_stat);
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} else {
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bte_status = BTE_SUCCESS;
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}
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*bte->most_rcnt_na = BTE_WORD_AVAILABLE;
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BTE_PRINTK(("Returning status is 0x%lx and most_rcnt_na is 0x%lx\n",
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BTE_LNSTAT_LOAD(bte), *bte->most_rcnt_na));
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return bte_status;
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}
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EXPORT_SYMBOL(bte_copy);
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/*
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* bte_unaligned_copy(src, dest, len, mode)
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*
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* use the block transfer engine to move kernel
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* memory from src to dest using the assigned mode.
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*
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* Parameters:
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* src - physical address of the transfer source.
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* dest - physical address of the transfer destination.
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* len - number of bytes to transfer from source to dest.
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* mode - hardware defined. See reference information
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* for IBCT0/1 in the SGI documentation.
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*
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* NOTE: If the source, dest, and len are all cache line aligned,
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* then it would be _FAR_ preferable to use bte_copy instead.
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*/
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bte_result_t bte_unaligned_copy(u64 src, u64 dest, u64 len, u64 mode)
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{
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int destFirstCacheOffset;
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u64 headBteSource;
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u64 headBteLen;
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u64 headBcopySrcOffset;
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u64 headBcopyDest;
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u64 headBcopyLen;
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u64 footBteSource;
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u64 footBteLen;
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u64 footBcopyDest;
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u64 footBcopyLen;
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bte_result_t rv;
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char *bteBlock, *bteBlock_unaligned;
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if (len == 0) {
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return BTE_SUCCESS;
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}
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/* temporary buffer used during unaligned transfers */
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bteBlock_unaligned = kmalloc(len + 3 * L1_CACHE_BYTES, GFP_KERNEL);
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if (bteBlock_unaligned == NULL) {
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return BTEFAIL_NOTAVAIL;
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}
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bteBlock = (char *)L1_CACHE_ALIGN((u64) bteBlock_unaligned);
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headBcopySrcOffset = src & L1_CACHE_MASK;
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destFirstCacheOffset = dest & L1_CACHE_MASK;
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/*
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* At this point, the transfer is broken into
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* (up to) three sections. The first section is
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* from the start address to the first physical
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* cache line, the second is from the first physical
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* cache line to the last complete cache line,
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* and the third is from the last cache line to the
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* end of the buffer. The first and third sections
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* are handled by bte copying into a temporary buffer
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* and then bcopy'ing the necessary section into the
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* final location. The middle section is handled with
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* a standard bte copy.
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*
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* One nasty exception to the above rule is when the
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* source and destination are not symmetrically
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* mis-aligned. If the source offset from the first
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* cache line is different from the destination offset,
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* we make the first section be the entire transfer
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* and the bcopy the entire block into place.
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*/
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if (headBcopySrcOffset == destFirstCacheOffset) {
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/*
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* Both the source and destination are the same
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* distance from a cache line boundary so we can
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* use the bte to transfer the bulk of the
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* data.
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*/
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headBteSource = src & ~L1_CACHE_MASK;
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headBcopyDest = dest;
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if (headBcopySrcOffset) {
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headBcopyLen =
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(len >
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(L1_CACHE_BYTES -
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headBcopySrcOffset) ? L1_CACHE_BYTES
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- headBcopySrcOffset : len);
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headBteLen = L1_CACHE_BYTES;
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} else {
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headBcopyLen = 0;
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headBteLen = 0;
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}
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if (len > headBcopyLen) {
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footBcopyLen = (len - headBcopyLen) & L1_CACHE_MASK;
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footBteLen = L1_CACHE_BYTES;
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footBteSource = src + len - footBcopyLen;
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footBcopyDest = dest + len - footBcopyLen;
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if (footBcopyDest == (headBcopyDest + headBcopyLen)) {
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/*
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* We have two contiguous bcopy
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* blocks. Merge them.
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*/
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headBcopyLen += footBcopyLen;
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headBteLen += footBteLen;
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} else if (footBcopyLen > 0) {
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rv = bte_copy(footBteSource,
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ia64_tpa((unsigned long)bteBlock),
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footBteLen, mode, NULL);
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if (rv != BTE_SUCCESS) {
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kfree(bteBlock_unaligned);
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return rv;
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}
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memcpy(__va(footBcopyDest),
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(char *)bteBlock, footBcopyLen);
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}
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} else {
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footBcopyLen = 0;
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footBteLen = 0;
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}
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if (len > (headBcopyLen + footBcopyLen)) {
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/* now transfer the middle. */
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rv = bte_copy((src + headBcopyLen),
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(dest +
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headBcopyLen),
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(len - headBcopyLen -
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footBcopyLen), mode, NULL);
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if (rv != BTE_SUCCESS) {
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kfree(bteBlock_unaligned);
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return rv;
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}
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}
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} else {
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/*
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* The transfer is not symmetric, we will
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* allocate a buffer large enough for all the
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* data, bte_copy into that buffer and then
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* bcopy to the destination.
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*/
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headBcopySrcOffset = src & L1_CACHE_MASK;
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headBcopyDest = dest;
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headBcopyLen = len;
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headBteSource = src - headBcopySrcOffset;
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/* Add the leading and trailing bytes from source */
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headBteLen = L1_CACHE_ALIGN(len + headBcopySrcOffset);
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}
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if (headBcopyLen > 0) {
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rv = bte_copy(headBteSource,
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ia64_tpa((unsigned long)bteBlock), headBteLen,
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mode, NULL);
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if (rv != BTE_SUCCESS) {
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kfree(bteBlock_unaligned);
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return rv;
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}
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memcpy(__va(headBcopyDest), ((char *)bteBlock +
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headBcopySrcOffset), headBcopyLen);
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}
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kfree(bteBlock_unaligned);
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return BTE_SUCCESS;
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}
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EXPORT_SYMBOL(bte_unaligned_copy);
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/************************************************************************
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* Block Transfer Engine initialization functions.
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*
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***********************************************************************/
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static void bte_recovery_timeout(struct timer_list *t)
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{
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struct nodepda_s *nodepda = from_timer(nodepda, t, bte_recovery_timer);
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bte_error_handler(nodepda);
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}
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/*
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* bte_init_node(nodepda, cnode)
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*
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* Initialize the nodepda structure with BTE base addresses and
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* spinlocks.
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*/
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void bte_init_node(nodepda_t * mynodepda, cnodeid_t cnode)
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{
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int i;
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/*
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* Indicate that all the block transfer engines on this node
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* are available.
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*/
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/*
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* Allocate one bte_recover_t structure per node. It holds
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* the recovery lock for node. All the bte interface structures
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* will point at this one bte_recover structure to get the lock.
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*/
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spin_lock_init(&mynodepda->bte_recovery_lock);
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timer_setup(&mynodepda->bte_recovery_timer, bte_recovery_timeout, 0);
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for (i = 0; i < BTES_PER_NODE; i++) {
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u64 *base_addr;
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/* Which link status register should we use? */
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base_addr = (u64 *)
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REMOTE_HUB_ADDR(cnodeid_to_nasid(cnode), BTE_BASE_ADDR(i));
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mynodepda->bte_if[i].bte_base_addr = base_addr;
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mynodepda->bte_if[i].bte_source_addr = BTE_SOURCE_ADDR(base_addr);
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mynodepda->bte_if[i].bte_destination_addr = BTE_DEST_ADDR(base_addr);
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mynodepda->bte_if[i].bte_control_addr = BTE_CTRL_ADDR(base_addr);
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mynodepda->bte_if[i].bte_notify_addr = BTE_NOTIF_ADDR(base_addr);
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/*
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* Initialize the notification and spinlock
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* so the first transfer can occur.
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*/
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mynodepda->bte_if[i].most_rcnt_na =
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&(mynodepda->bte_if[i].notify);
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mynodepda->bte_if[i].notify = BTE_WORD_AVAILABLE;
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spin_lock_init(&mynodepda->bte_if[i].spinlock);
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mynodepda->bte_if[i].bte_cnode = cnode;
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mynodepda->bte_if[i].bte_error_count = 0;
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mynodepda->bte_if[i].bte_num = i;
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mynodepda->bte_if[i].cleanup_active = 0;
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mynodepda->bte_if[i].bh_error = 0;
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}
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}
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