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kernel-fxtec-pro1x/arch/ia64/include/asm/sn/bte.h
Robin Holt 39d481cba2 [IA64] bte_copy of BTE_MAX_XFER trips BUG_ON. 
BTE_MAX_XFER is wrong.  It is one greater than the number of cache
lines the BTE is actually able to transfer.  If you request a transfer
of exactly BTE_MAX_XFER size, you trip a very cryptic BUG_ON() which
should certainly be made more clear.

This patch fixes that constant and also cleans up the BUG_ON()s in
arch/ia64/sn/kernel/bte.c to test one condition per line.

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Tony Luck <aegl@agluck-desktop.(none)>
2009-02-19 11:29:31 -08:00

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/*
* 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) 2000-2007 Silicon Graphics, Inc. All Rights Reserved.
*/
#ifndef _ASM_IA64_SN_BTE_H
#define _ASM_IA64_SN_BTE_H
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <linux/cache.h>
#include <asm/sn/pda.h>
#include <asm/sn/types.h>
#include <asm/sn/shub_mmr.h>
#define IBCT_NOTIFY (0x1UL << 4)
#define IBCT_ZFIL_MODE (0x1UL << 0)
/* #define BTE_DEBUG */
/* #define BTE_DEBUG_VERBOSE */
#ifdef BTE_DEBUG
# define BTE_PRINTK(x) printk x /* Terse */
# ifdef BTE_DEBUG_VERBOSE
# define BTE_PRINTKV(x) printk x /* Verbose */
# else
# define BTE_PRINTKV(x)
# endif /* BTE_DEBUG_VERBOSE */
#else
# define BTE_PRINTK(x)
# define BTE_PRINTKV(x)
#endif /* BTE_DEBUG */
/* BTE status register only supports 16 bits for length field */
#define BTE_LEN_BITS (16)
#define BTE_LEN_MASK ((1 << BTE_LEN_BITS) - 1)
#define BTE_MAX_XFER (BTE_LEN_MASK << L1_CACHE_SHIFT)
/* Define hardware */
#define BTES_PER_NODE (is_shub2() ? 4 : 2)
#define MAX_BTES_PER_NODE 4
#define BTE2OFF_CTRL 0
#define BTE2OFF_SRC (SH2_BT_ENG_SRC_ADDR_0 - SH2_BT_ENG_CSR_0)
#define BTE2OFF_DEST (SH2_BT_ENG_DEST_ADDR_0 - SH2_BT_ENG_CSR_0)
#define BTE2OFF_NOTIFY (SH2_BT_ENG_NOTIF_ADDR_0 - SH2_BT_ENG_CSR_0)
#define BTE_BASE_ADDR(interface) \
(is_shub2() ? (interface == 0) ? SH2_BT_ENG_CSR_0 : \
(interface == 1) ? SH2_BT_ENG_CSR_1 : \
(interface == 2) ? SH2_BT_ENG_CSR_2 : \
SH2_BT_ENG_CSR_3 \
: (interface == 0) ? IIO_IBLS0 : IIO_IBLS1)
#define BTE_SOURCE_ADDR(base) \
(is_shub2() ? base + (BTE2OFF_SRC/8) \
: base + (BTEOFF_SRC/8))
#define BTE_DEST_ADDR(base) \
(is_shub2() ? base + (BTE2OFF_DEST/8) \
: base + (BTEOFF_DEST/8))
#define BTE_CTRL_ADDR(base) \
(is_shub2() ? base + (BTE2OFF_CTRL/8) \
: base + (BTEOFF_CTRL/8))
#define BTE_NOTIF_ADDR(base) \
(is_shub2() ? base + (BTE2OFF_NOTIFY/8) \
: base + (BTEOFF_NOTIFY/8))
/* Define hardware modes */
#define BTE_NOTIFY IBCT_NOTIFY
#define BTE_NORMAL BTE_NOTIFY
#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
/* 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 */
#define BTE_USE_ANY (BTE_USE_DEST << 1)
/* macro to force the IBCT0 value valid */
#define BTE_VALID_MODE(x) ((x) & (IBCT_NOTIFY | IBCT_ZFIL_MODE))
#define BTE_ACTIVE (IBLS_BUSY | IBLS_ERROR)
#define BTE_WORD_AVAILABLE (IBLS_BUSY << 1)
#define BTE_WORD_BUSY (~BTE_WORD_AVAILABLE)
/*
* Some macros to simplify reading.
* Start with macros to locate the BTE control registers.
*/
#define BTE_LNSTAT_LOAD(_bte) \
HUB_L(_bte->bte_base_addr)
#define BTE_LNSTAT_STORE(_bte, _x) \
HUB_S(_bte->bte_base_addr, (_x))
#define BTE_SRC_STORE(_bte, _x) \
({ \
u64 __addr = ((_x) & ~AS_MASK); \
if (is_shub2()) \
__addr = SH2_TIO_PHYS_TO_DMA(__addr); \
HUB_S(_bte->bte_source_addr, __addr); \
})
#define BTE_DEST_STORE(_bte, _x) \
({ \
u64 __addr = ((_x) & ~AS_MASK); \
if (is_shub2()) \
__addr = SH2_TIO_PHYS_TO_DMA(__addr); \
HUB_S(_bte->bte_destination_addr, __addr); \
})
#define BTE_CTRL_STORE(_bte, _x) \
HUB_S(_bte->bte_control_addr, (_x))
#define BTE_NOTIF_STORE(_bte, _x) \
({ \
u64 __addr = ia64_tpa((_x) & ~AS_MASK); \
if (is_shub2()) \
__addr = SH2_TIO_PHYS_TO_DMA(__addr); \
HUB_S(_bte->bte_notify_addr, __addr); \
})
#define BTE_START_TRANSFER(_bte, _len, _mode) \
is_shub2() ? BTE_CTRL_STORE(_bte, IBLS_BUSY | (_mode << 24) | _len) \
: BTE_LNSTAT_STORE(_bte, _len); \
BTE_CTRL_STORE(_bte, _mode)
/* Possible results from bte_copy and bte_unaligned_copy */
/* The following error codes map into the BTE hardware codes
* IIO_ICRB_ECODE_* (in shubio.h). The hardware uses
* an error code of 0 (IIO_ICRB_ECODE_DERR), but we want zero
* to mean BTE_SUCCESS, so add one (BTEFAIL_OFFSET) to the error
* codes to give the following error codes.
*/
#define BTEFAIL_OFFSET 1
typedef enum {
BTE_SUCCESS, /* 0 is success */
BTEFAIL_DIR, /* Directory error due to IIO access*/
BTEFAIL_POISON, /* poison error on IO access (write to poison page) */
BTEFAIL_WERR, /* Write error (ie WINV to a Read only line) */
BTEFAIL_ACCESS, /* access error (protection violation) */
BTEFAIL_PWERR, /* Partial Write Error */
BTEFAIL_PRERR, /* Partial Read Error */
BTEFAIL_TOUT, /* CRB Time out */
BTEFAIL_XTERR, /* Incoming xtalk pkt had error bit */
BTEFAIL_NOTAVAIL, /* BTE not available */
} bte_result_t;
#define BTEFAIL_SH2_RESP_SHORT 0x1 /* bit 000001 */
#define BTEFAIL_SH2_RESP_LONG 0x2 /* bit 000010 */
#define BTEFAIL_SH2_RESP_DSP 0x4 /* bit 000100 */
#define BTEFAIL_SH2_RESP_ACCESS 0x8 /* bit 001000 */
#define BTEFAIL_SH2_CRB_TO 0x10 /* bit 010000 */
#define BTEFAIL_SH2_NACK_LIMIT 0x20 /* bit 100000 */
#define BTEFAIL_SH2_ALL 0x3F /* bit 111111 */
#define BTE_ERR_BITS 0x3FUL
#define BTE_ERR_SHIFT 36
#define BTE_ERR_MASK (BTE_ERR_BITS << BTE_ERR_SHIFT)
#define BTE_ERROR_RETRY(value) \
(is_shub2() ? (value != BTEFAIL_SH2_CRB_TO) \
: (value != BTEFAIL_TOUT))
/*
* On shub1 BTE_ERR_MASK will always be false, so no need for is_shub2()
*/
#define BTE_SHUB2_ERROR(_status) \
((_status & BTE_ERR_MASK) \
? (((_status >> BTE_ERR_SHIFT) & BTE_ERR_BITS) | IBLS_ERROR) \
: _status)
#define BTE_GET_ERROR_STATUS(_status) \
(BTE_SHUB2_ERROR(_status) & ~IBLS_ERROR)
#define BTE_VALID_SH2_ERROR(value) \
((value >= BTEFAIL_SH2_RESP_SHORT) && (value <= BTEFAIL_SH2_ALL))
/*
* Structure defining a bte. An instance of this
* structure is created in the nodepda for each
* bte on that node (as defined by BTES_PER_NODE)
* This structure contains everything necessary
* to work with a BTE.
*/
struct bteinfo_s {
volatile u64 notify ____cacheline_aligned;
u64 *bte_base_addr ____cacheline_aligned;
u64 *bte_source_addr;
u64 *bte_destination_addr;
u64 *bte_control_addr;
u64 *bte_notify_addr;
spinlock_t spinlock;
cnodeid_t bte_cnode; /* cnode */
int bte_error_count; /* Number of errors encountered */
int bte_num; /* 0 --> BTE0, 1 --> BTE1 */
int cleanup_active; /* Interface is locked for cleanup */
volatile bte_result_t bh_error; /* error while processing */
volatile u64 *most_rcnt_na;
struct bteinfo_s *btes_to_try[MAX_BTES_PER_NODE];
};
/*
* Function prototypes (functions defined in bte.c, used elsewhere)
*/
extern bte_result_t bte_copy(u64, u64, u64, u64, void *);
extern bte_result_t bte_unaligned_copy(u64, u64, u64, u64);
extern void bte_error_handler(unsigned long);
#define bte_zero(dest, len, mode, notification) \
bte_copy(0, dest, len, ((mode) | BTE_ZERO_FILL), notification)
/*
* The following is the prefered way of calling bte_unaligned_copy
* If the copy is fully cache line aligned, then bte_copy is
* used instead. Since bte_copy is inlined, this saves a call
* stack. NOTE: bte_copy is called synchronously and does block
* until the transfer is complete. In order to get the asynch
* version of bte_copy, you must perform this check yourself.
*/
#define BTE_UNALIGNED_COPY(src, dest, len, mode) \
(((len & (L1_CACHE_BYTES - 1)) || \
(src & (L1_CACHE_BYTES - 1)) || \
(dest & (L1_CACHE_BYTES - 1))) ? \
bte_unaligned_copy(src, dest, len, mode) : \
bte_copy(src, dest, len, mode, NULL))
#endif /* _ASM_IA64_SN_BTE_H */
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