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    SubjectPrezeroing V2 [4/4]: Hardware Zeroing through SGI BTE
    o Zeroing driver implemented with the Block Transfer Engine in the Altix SN2 SHub

    Signed-off-by: Christoph Lameter <clameter@sgi.com>

    Index: linux-2.6.9/arch/ia64/sn/kernel/bte.c
    ===================================================================
    --- linux-2.6.9.orig/arch/ia64/sn/kernel/bte.c 2004-12-17 14:40:10.000000000 -0800
    +++ linux-2.6.9/arch/ia64/sn/kernel/bte.c 2004-12-22 12:48:23.000000000 -0800
    @@ -4,6 +4,8 @@
    * for more details.
    *
    * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
    + *
    + * Support for zeroing pages, Christoph Lameter, SGI, December 2004.
    */

    #include <linux/config.h>
    @@ -20,6 +22,8 @@
    #include <linux/bootmem.h>
    #include <linux/string.h>
    #include <linux/sched.h>
    +#include <linux/mm.h>
    +#include <linux/scrub.h>

    #include <asm/sn/bte.h>

    @@ -30,7 +34,7 @@
    /* two interfaces on two btes */
    #define MAX_INTERFACES_TO_TRY 4

    -static struct bteinfo_s *bte_if_on_node(nasid_t nasid, int interface)
    +static inline struct bteinfo_s *bte_if_on_node(nasid_t nasid, int interface)
    {
    nodepda_t *tmp_nodepda;

    @@ -132,7 +136,6 @@
    if (bte == NULL) {
    continue;
    }
    -
    if (spin_trylock(&bte->spinlock)) {
    if (!(*bte->most_rcnt_na & BTE_WORD_AVAILABLE) ||
    (BTE_LNSTAT_LOAD(bte) & BTE_ACTIVE)) {
    @@ -157,7 +160,7 @@
    }
    } while (1);

    - if (notification == NULL) {
    + if (notification == NULL || (mode & BTE_NOTIFY_AND_GET_POINTER)) {
    /* User does not want to be notified. */
    bte->most_rcnt_na = &bte->notify;
    } else {
    @@ -192,6 +195,8 @@

    itc_end = ia64_get_itc() + (40000000 * local_cpu_data->cyc_per_usec);

    + if (mode & BTE_NOTIFY_AND_GET_POINTER)
    + *(u64 volatile **)(notification) = &bte->notify;
    spin_unlock_irqrestore(&bte->spinlock, irq_flags);

    if (notification != NULL) {
    @@ -449,5 +454,37 @@
    mynodepda->bte_if[i].cleanup_active = 0;
    mynodepda->bte_if[i].bh_error = 0;
    }
    +}
    +
    +u64 *bte_zero_notify[MAX_COMPACT_NODES];
    +
    +static int bte_check_bzero(void)
    +{
    + int node = get_nasid();
    +
    + return *(bte_zero_notify[node]) != BTE_WORD_BUSY;
    +}
    +
    +static int bte_start_bzero(void *p, unsigned long len)
    +{
    + int node = get_nasid();
    +
    + /* Check limitations.
    + 1. System must be running (weird things happen during bootup)
    + 2. Size >64KB. Smaller requests cause too much bte traffic
    + */
    + if (len >= BTE_MAX_XFER || len < 60000 || system_state != SYSTEM_RUNNING)
    + return EINVAL;
    +
    + return bte_zero(ia64_tpa(p), len, BTE_NOTIFY_AND_GET_POINTER, bte_zero_notify+node);
    +}
    +
    +static struct zero_driver bte_bzero = {
    + .start = bte_start_bzero,
    + .check = bte_check_bzero,
    + .rate = 500000000 /* 500 MB /sec */
    +};

    +void sn_bte_bzero_init(void) {
    + register_zero_driver(&bte_bzero);
    }
    Index: linux-2.6.9/arch/ia64/sn/kernel/setup.c
    ===================================================================
    --- linux-2.6.9.orig/arch/ia64/sn/kernel/setup.c 2004-12-17 14:40:10.000000000 -0800
    +++ linux-2.6.9/arch/ia64/sn/kernel/setup.c 2004-12-22 12:28:00.000000000 -0800
    @@ -243,6 +243,7 @@
    int pxm;
    int major = sn_sal_rev_major(), minor = sn_sal_rev_minor();
    extern void sn_cpu_init(void);
    + extern void sn_bte_bzero_init(void);

    /*
    * If the generic code has enabled vga console support - lets
    @@ -333,6 +334,7 @@
    screen_info = sn_screen_info;

    sn_timer_init();
    + sn_bte_bzero_init();
    }

    /**
    Index: linux-2.6.9/include/asm-ia64/sn/bte.h
    ===================================================================
    --- linux-2.6.9.orig/include/asm-ia64/sn/bte.h 2004-12-17 14:40:16.000000000 -0800
    +++ linux-2.6.9/include/asm-ia64/sn/bte.h 2004-12-22 12:28:00.000000000 -0800
    @@ -48,6 +48,8 @@
    #define BTE_ZERO_FILL (BTE_NOTIFY | IBCT_ZFIL_MODE)
    /* Use a reserved bit to let the caller specify a wait for any BTE */
    #define BTE_WACQUIRE (0x4000)
    +/* Return the pointer to the notification cacheline to the user */
    +#define BTE_NOTIFY_AND_GET_POINTER (0x8000)
    /* Use the BTE on the node with the destination memory */
    #define BTE_USE_DEST (BTE_WACQUIRE << 1)
    /* Use any available BTE interface on any node for the transfer */
    -
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