1 files changed, 453 insertions, 0 deletions

diff --git a/arch/ia64/sn/kernel/bte.c b/arch/ia64/sn/kernel/bte.c
new file mode 100644
index 000000000000..ce0bc4085eae
--- /dev/null
+++ b/arch/ia64/sn/kernel/bte.c
@@ -0,0 +1,453 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <asm/sn/nodepda.h>
+#include <asm/sn/addrs.h>
+#include <asm/sn/arch.h>
+#include <asm/sn/sn_cpuid.h>
+#include <asm/sn/pda.h>
+#include <asm/sn/shubio.h>
+#include <asm/nodedata.h>
+#include <asm/delay.h>
+
+#include <linux/bootmem.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+
+#include <asm/sn/bte.h>
+
+#ifndef L1_CACHE_MASK
+#define L1_CACHE_MASK (L1_CACHE_BYTES - 1)
+#endif
+
+/* two interfaces on two btes */
+#define MAX_INTERFACES_TO_TRY		4
+
+static struct bteinfo_s *bte_if_on_node(nasid_t nasid, int interface)
+{
+	nodepda_t *tmp_nodepda;
+
+	tmp_nodepda = NODEPDA(nasid_to_cnodeid(nasid));
+	return &tmp_nodepda->bte_if[interface];
+
+}
+
+/************************************************************************
+ * Block Transfer Engine copy related functions.
+ *
+ ***********************************************************************/
+
+/*
+ * bte_copy(src, dest, len, mode, notification)
+ *
+ * Use the block transfer engine to move kernel memory from src to dest
+ * using the assigned mode.
+ *
+ * Paramaters:
+ *   src - physical address of the transfer source.
+ *   dest - physical address of the transfer destination.
+ *   len - number of bytes to transfer from source to dest.
+ *   mode - hardware defined.  See reference information
+ *          for IBCT0/1 in the SHUB Programmers Reference
+ *   notification - kernel virtual address of the notification cache
+ *                  line.  If NULL, the default is used and
+ *                  the bte_copy is synchronous.
+ *
+ * NOTE:  This function requires src, dest, and len to
+ * be cacheline aligned.
+ */
+bte_result_t bte_copy(u64 src, u64 dest, u64 len, u64 mode, void *notification)
+{
+	u64 transfer_size;
+	u64 transfer_stat;
+	struct bteinfo_s *bte;
+	bte_result_t bte_status;
+	unsigned long irq_flags;
+	unsigned long itc_end = 0;
+	struct bteinfo_s *btes_to_try[MAX_INTERFACES_TO_TRY];
+	int bte_if_index;
+	int bte_pri, bte_sec;
+
+	BTE_PRINTK(("bte_copy(0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%p)\n",
+		    src, dest, len, mode, notification));
+
+	if (len == 0) {
+		return BTE_SUCCESS;
+	}
+
+	BUG_ON((len & L1_CACHE_MASK) ||
+		 (src & L1_CACHE_MASK) || (dest & L1_CACHE_MASK));
+	BUG_ON(!(len < ((BTE_LEN_MASK + 1) << L1_CACHE_SHIFT)));
+
+	/* CPU 0 (per node) tries bte0 first, CPU 1 try bte1 first */
+	if (cpuid_to_subnode(smp_processor_id()) == 0) {
+		bte_pri = 0;
+		bte_sec = 1;
+	} else {
+		bte_pri = 1;
+		bte_sec = 0;
+	}
+
+	if (mode & BTE_USE_DEST) {
+		/* try remote then local */
+		btes_to_try[0] = bte_if_on_node(NASID_GET(dest), bte_pri);
+		btes_to_try[1] = bte_if_on_node(NASID_GET(dest), bte_sec);
+		if (mode & BTE_USE_ANY) {
+			btes_to_try[2] = bte_if_on_node(get_nasid(), bte_pri);
+			btes_to_try[3] = bte_if_on_node(get_nasid(), bte_sec);
+		} else {
+			btes_to_try[2] = NULL;
+			btes_to_try[3] = NULL;
+		}
+	} else {
+		/* try local then remote */
+		btes_to_try[0] = bte_if_on_node(get_nasid(), bte_pri);
+		btes_to_try[1] = bte_if_on_node(get_nasid(), bte_sec);
+		if (mode & BTE_USE_ANY) {
+			btes_to_try[2] = bte_if_on_node(NASID_GET(dest), bte_pri);
+			btes_to_try[3] = bte_if_on_node(NASID_GET(dest), bte_sec);
+		} else {
+			btes_to_try[2] = NULL;
+			btes_to_try[3] = NULL;
+		}
+	}
+
+retry_bteop:
+	do {
+		local_irq_save(irq_flags);
+
+		bte_if_index = 0;
+
+		/* Attempt to lock one of the BTE interfaces. */
+		while (bte_if_index < MAX_INTERFACES_TO_TRY) {
+			bte = btes_to_try[bte_if_index++];
+
+			if (bte == NULL) {
+				continue;
+			}
+
+			if (spin_trylock(&bte->spinlock)) {
+				if (!(*bte->most_rcnt_na & BTE_WORD_AVAILABLE) ||
+				    (BTE_LNSTAT_LOAD(bte) & BTE_ACTIVE)) {
+					/* Got the lock but BTE still busy */
+					spin_unlock(&bte->spinlock);
+				} else {
+					/* we got the lock and it's not busy */
+					break;
+				}
+			}
+			bte = NULL;
+		}
+
+		if (bte != NULL) {
+			break;
+		}
+
+		local_irq_restore(irq_flags);
+
+		if (!(mode & BTE_WACQUIRE)) {
+			return BTEFAIL_NOTAVAIL;
+		}
+	} while (1);
+
+	if (notification == NULL) {
+		/* User does not want to be notified. */
+		bte->most_rcnt_na = &bte->notify;
+	} else {
+		bte->most_rcnt_na = notification;
+	}
+
+	/* Calculate the number of cache lines to transfer. */
+	transfer_size = ((len >> L1_CACHE_SHIFT) & BTE_LEN_MASK);
+
+	/* Initialize the notification to a known value. */
+	*bte->most_rcnt_na = BTE_WORD_BUSY;
+
+	/* Set the status reg busy bit and transfer length */
+	BTE_PRINTKV(("IBLS = 0x%lx\n", IBLS_BUSY | transfer_size));
+	BTE_LNSTAT_STORE(bte, IBLS_BUSY | transfer_size);
+
+	/* Set the source and destination registers */
+	BTE_PRINTKV(("IBSA = 0x%lx)\n", (TO_PHYS(src))));
+	BTE_SRC_STORE(bte, TO_PHYS(src));
+	BTE_PRINTKV(("IBDA = 0x%lx)\n", (TO_PHYS(dest))));
+	BTE_DEST_STORE(bte, TO_PHYS(dest));
+
+	/* Set the notification register */
+	BTE_PRINTKV(("IBNA = 0x%lx)\n",
+		     TO_PHYS(ia64_tpa((unsigned long)bte->most_rcnt_na))));
+	BTE_NOTIF_STORE(bte,
+			TO_PHYS(ia64_tpa((unsigned long)bte->most_rcnt_na)));
+
+	/* Initiate the transfer */
+	BTE_PRINTK(("IBCT = 0x%lx)\n", BTE_VALID_MODE(mode)));
+	BTE_CTRL_STORE(bte, BTE_VALID_MODE(mode));
+
+	itc_end = ia64_get_itc() + (40000000 * local_cpu_data->cyc_per_usec);
+
+	spin_unlock_irqrestore(&bte->spinlock, irq_flags);
+
+	if (notification != NULL) {
+		return BTE_SUCCESS;
+	}
+
+	while ((transfer_stat = *bte->most_rcnt_na) == BTE_WORD_BUSY) {
+		if (ia64_get_itc() > itc_end) {
+			BTE_PRINTK(("BTE timeout nasid 0x%x bte%d IBLS = 0x%lx na 0x%lx\n",
+				NASID_GET(bte->bte_base_addr), bte->bte_num,
+				BTE_LNSTAT_LOAD(bte), *bte->most_rcnt_na) );
+			bte->bte_error_count++;
+			bte->bh_error = IBLS_ERROR;
+			bte_error_handler((unsigned long)NODEPDA(bte->bte_cnode));
+			*bte->most_rcnt_na = BTE_WORD_AVAILABLE;
+			goto retry_bteop;
+		}
+	}
+
+	BTE_PRINTKV((" Delay Done.  IBLS = 0x%lx, most_rcnt_na = 0x%lx\n",
+		     BTE_LNSTAT_LOAD(bte), *bte->most_rcnt_na));
+
+	if (transfer_stat & IBLS_ERROR) {
+		bte_status = transfer_stat & ~IBLS_ERROR;
+	} else {
+		bte_status = BTE_SUCCESS;
+	}
+	*bte->most_rcnt_na = BTE_WORD_AVAILABLE;
+
+	BTE_PRINTK(("Returning status is 0x%lx and most_rcnt_na is 0x%lx\n",
+		    BTE_LNSTAT_LOAD(bte), *bte->most_rcnt_na));
+
+	return bte_status;
+}
+
+EXPORT_SYMBOL(bte_copy);
+
+/*
+ * bte_unaligned_copy(src, dest, len, mode)
+ *
+ * use the block transfer engine to move kernel
+ * memory from src to dest using the assigned mode.
+ *
+ * Paramaters:
+ *   src - physical address of the transfer source.
+ *   dest - physical address of the transfer destination.
+ *   len - number of bytes to transfer from source to dest.
+ *   mode - hardware defined.  See reference information
+ *          for IBCT0/1 in the SGI documentation.
+ *
+ * NOTE: If the source, dest, and len are all cache line aligned,
+ * then it would be _FAR_ preferrable to use bte_copy instead.
+ */
+bte_result_t bte_unaligned_copy(u64 src, u64 dest, u64 len, u64 mode)
+{
+	int destFirstCacheOffset;
+	u64 headBteSource;
+	u64 headBteLen;
+	u64 headBcopySrcOffset;
+	u64 headBcopyDest;
+	u64 headBcopyLen;
+	u64 footBteSource;
+	u64 footBteLen;
+	u64 footBcopyDest;
+	u64 footBcopyLen;
+	bte_result_t rv;
+	char *bteBlock, *bteBlock_unaligned;
+
+	if (len == 0) {
+		return BTE_SUCCESS;
+	}
+
+	/* temporary buffer used during unaligned transfers */
+	bteBlock_unaligned = kmalloc(len + 3 * L1_CACHE_BYTES,
+				     GFP_KERNEL | GFP_DMA);
+	if (bteBlock_unaligned == NULL) {
+		return BTEFAIL_NOTAVAIL;
+	}
+	bteBlock = (char *)L1_CACHE_ALIGN((u64) bteBlock_unaligned);
+
+	headBcopySrcOffset = src & L1_CACHE_MASK;
+	destFirstCacheOffset = dest & L1_CACHE_MASK;
+
+	/*
+	 * At this point, the transfer is broken into
+	 * (up to) three sections.  The first section is
+	 * from the start address to the first physical
+	 * cache line, the second is from the first physical
+	 * cache line to the last complete cache line,
+	 * and the third is from the last cache line to the
+	 * end of the buffer.  The first and third sections
+	 * are handled by bte copying into a temporary buffer
+	 * and then bcopy'ing the necessary section into the
+	 * final location.  The middle section is handled with
+	 * a standard bte copy.
+	 *
+	 * One nasty exception to the above rule is when the
+	 * source and destination are not symetrically
+	 * mis-aligned.  If the source offset from the first
+	 * cache line is different from the destination offset,
+	 * we make the first section be the entire transfer
+	 * and the bcopy the entire block into place.
+	 */
+	if (headBcopySrcOffset == destFirstCacheOffset) {
+
+		/*
+		 * Both the source and destination are the same
+		 * distance from a cache line boundary so we can
+		 * use the bte to transfer the bulk of the
+		 * data.
+		 */
+		headBteSource = src & ~L1_CACHE_MASK;
+		headBcopyDest = dest;
+		if (headBcopySrcOffset) {
+			headBcopyLen =
+			    (len >
+			     (L1_CACHE_BYTES -
+			      headBcopySrcOffset) ? L1_CACHE_BYTES
+			     - headBcopySrcOffset : len);
+			headBteLen = L1_CACHE_BYTES;
+		} else {
+			headBcopyLen = 0;
+			headBteLen = 0;
+		}
+
+		if (len > headBcopyLen) {
+			footBcopyLen = (len - headBcopyLen) & L1_CACHE_MASK;
+			footBteLen = L1_CACHE_BYTES;
+
+			footBteSource = src + len - footBcopyLen;
+			footBcopyDest = dest + len - footBcopyLen;
+
+			if (footBcopyDest == (headBcopyDest + headBcopyLen)) {
+				/*
+				 * We have two contigous bcopy
+				 * blocks.  Merge them.
+				 */
+				headBcopyLen += footBcopyLen;
+				headBteLen += footBteLen;
+			} else if (footBcopyLen > 0) {
+				rv = bte_copy(footBteSource,
+					      ia64_tpa((unsigned long)bteBlock),
+					      footBteLen, mode, NULL);
+				if (rv != BTE_SUCCESS) {
+					kfree(bteBlock_unaligned);
+					return rv;
+				}
+
+				memcpy(__va(footBcopyDest),
+				       (char *)bteBlock, footBcopyLen);
+			}
+		} else {
+			footBcopyLen = 0;
+			footBteLen = 0;
+		}
+
+		if (len > (headBcopyLen + footBcopyLen)) {
+			/* now transfer the middle. */
+			rv = bte_copy((src + headBcopyLen),
+				      (dest +
+				       headBcopyLen),
+				      (len - headBcopyLen -
+				       footBcopyLen), mode, NULL);
+			if (rv != BTE_SUCCESS) {
+				kfree(bteBlock_unaligned);
+				return rv;
+			}
+
+		}
+	} else {
+
+		/*
+		 * The transfer is not symetric, we will
+		 * allocate a buffer large enough for all the
+		 * data, bte_copy into that buffer and then
+		 * bcopy to the destination.
+		 */
+
+		/* Add the leader from source */
+		headBteLen = len + (src & L1_CACHE_MASK);
+		/* Add the trailing bytes from footer. */
+		headBteLen += L1_CACHE_BYTES - (headBteLen & L1_CACHE_MASK);
+		headBteSource = src & ~L1_CACHE_MASK;
+		headBcopySrcOffset = src & L1_CACHE_MASK;
+		headBcopyDest = dest;
+		headBcopyLen = len;
+	}
+
+	if (headBcopyLen > 0) {
+		rv = bte_copy(headBteSource,
+			      ia64_tpa((unsigned long)bteBlock), headBteLen,
+			      mode, NULL);
+		if (rv != BTE_SUCCESS) {
+			kfree(bteBlock_unaligned);
+			return rv;
+		}
+
+		memcpy(__va(headBcopyDest), ((char *)bteBlock +
+					     headBcopySrcOffset), headBcopyLen);
+	}
+	kfree(bteBlock_unaligned);
+	return BTE_SUCCESS;
+}
+
+EXPORT_SYMBOL(bte_unaligned_copy);
+
+/************************************************************************
+ * Block Transfer Engine initialization functions.
+ *
+ ***********************************************************************/
+
+/*
+ * bte_init_node(nodepda, cnode)
+ *
+ * Initialize the nodepda structure with BTE base addresses and
+ * spinlocks.
+ */
+void bte_init_node(nodepda_t * mynodepda, cnodeid_t cnode)
+{
+	int i;
+
+	/*
+	 * Indicate that all the block transfer engines on this node
+	 * are available.
+	 */
+
+	/*
+	 * Allocate one bte_recover_t structure per node.  It holds
+	 * the recovery lock for node.  All the bte interface structures
+	 * will point at this one bte_recover structure to get the lock.
+	 */
+	spin_lock_init(&mynodepda->bte_recovery_lock);
+	init_timer(&mynodepda->bte_recovery_timer);
+	mynodepda->bte_recovery_timer.function = bte_error_handler;
+	mynodepda->bte_recovery_timer.data = (unsigned long)mynodepda;
+
+	for (i = 0; i < BTES_PER_NODE; i++) {
+		/* Which link status register should we use? */
+		unsigned long link_status = (i == 0 ? IIO_IBLS0 : IIO_IBLS1);
+		mynodepda->bte_if[i].bte_base_addr = (u64 *)
+		    REMOTE_HUB_ADDR(cnodeid_to_nasid(cnode), link_status);
+
+		/*
+		 * Initialize the notification and spinlock
+		 * so the first transfer can occur.
+		 */
+		mynodepda->bte_if[i].most_rcnt_na =
+		    &(mynodepda->bte_if[i].notify);
+		mynodepda->bte_if[i].notify = BTE_WORD_AVAILABLE;
+		spin_lock_init(&mynodepda->bte_if[i].spinlock);
+
+		mynodepda->bte_if[i].bte_cnode = cnode;
+		mynodepda->bte_if[i].bte_error_count = 0;
+		mynodepda->bte_if[i].bte_num = i;
+		mynodepda->bte_if[i].cleanup_active = 0;
+		mynodepda->bte_if[i].bh_error = 0;
+	}
+
+}