litmus-rt.git - The LITMUS^RT kernel.

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author	Johannes Weiner <hannes@saeurebad.de>	2008-07-25 22:46:16 -0400
committer	Linus Torvalds <torvalds@linux-foundation.org>	2008-07-26 15:00:11 -0400
commit	e66ddf1a4593d9bec8623782b94d7b50cc58cec5 (patch)
tree	670f385fa7a202a1bcdb6d74e006e98d3749fc60 /arch/mips/mm
parent	4bad9ea20146860d726ac14a53206da6be132b98 (diff)

mips: use generic show_mem()

Remove arch-specific show_mem() in favor of the generic version. This also removes the following redundant information display: - pages in swapcache, printed by show_swap_cache_info() where show_mem() calls show_free_areas(), which calls show_swap_cache_info(). And show_mem() does now actually print something on configurations with multiple nodes. Signed-off-by: Johannes Weiner <hannes@saeurebad.de> Acked-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Diffstat (limited to 'arch/mips/mm')

-rw-r--r--

arch/mips/mm/Makefile

-rw-r--r--

arch/mips/mm/pgtable.c

2 files changed, 1 insertions, 38 deletions


diff --git a/arch/mips/mm/Makefile b/arch/mips/mm/Makefile index 48731020ca0e..44e8dd8106bf 100644 --- a/arch/mips/mm/Makefile +++ b/arch/mips/mm/Makefile
@@ -3,8 +3,7 @@
3	#	3	#
4		4
5	obj-y += cache.o dma-default.o extable.o fault.o \	5	obj-y += cache.o dma-default.o extable.o fault.o \
6	init.o pgtable.o tlbex.o tlbex-fault.o \	6	init.o tlbex.o tlbex-fault.o uasm.o page.o
7	uasm.o page.o
8		7
9	obj-$(CONFIG_32BIT) += ioremap.o pgtable-32.o	8	obj-$(CONFIG_32BIT) += ioremap.o pgtable-32.o
10	obj-$(CONFIG_64BIT) += pgtable-64.o	9	obj-$(CONFIG_64BIT) += pgtable-64.o


diff --git a/arch/mips/mm/pgtable.c b/arch/mips/mm/pgtable.c deleted file mode 100644 index 7dfa579ab24c..000000000000 --- a/arch/mips/mm/pgtable.c +++ /dev/null
@@ -1,36 +0,0 @@
1	#include <linux/kernel.h>
2	#include <linux/mm.h>
3	#include <linux/swap.h>
4
5	void show_mem(void)
6	{
7	#ifndef CONFIG_NEED_MULTIPLE_NODES /* XXX(hch): later.. */
8	int pfn, total = 0, reserved = 0;
9	int shared = 0, cached = 0;
10	int highmem = 0;
11	struct page *page;
12
13	printk("Mem-info:\n");
14	show_free_areas();
15	pfn = max_mapnr;
16	while (pfn-- > 0) {
17	if (!pfn_valid(pfn))
18	continue;
19	page = pfn_to_page(pfn);
20	total++;
21	if (PageHighMem(page))
22	highmem++;
23	if (PageReserved(page))
24	reserved++;
25	else if (PageSwapCache(page))
26	cached++;
27	else if (page_count(page))
28	shared += page_count(page) - 1;
29	}
30	printk("%d pages of RAM\n", total);
31	printk("%d pages of HIGHMEM\n", highmem);
32	printk("%d reserved pages\n", reserved);
33	printk("%d pages shared\n", shared);
34	printk("%d pages swap cached\n", cached);
35	#endif
36	}

/* * in2000.c - Linux device driver for the * Always IN2000 ISA SCSI card. * * Copyright (c) 1996 John Shifflett, GeoLog Consulting * john@geolog.com * jshiffle@netcom.com * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * For the avoidance of doubt the "preferred form" of this code is one which * is in an open non patent encumbered format. Where cryptographic key signing * forms part of the process of creating an executable the information * including keys needed to generate an equivalently functional executable * are deemed to be part of the source code. * * Drew Eckhardt's excellent 'Generic NCR5380' sources provided * much of the inspiration and some of the code for this driver. * The Linux IN2000 driver distributed in the Linux kernels through * version 1.2.13 was an extremely valuable reference on the arcane * (and still mysterious) workings of the IN2000's fifo. It also * is where I lifted in2000_biosparam(), the gist of the card * detection scheme, and other bits of code. Many thanks to the * talented and courageous people who wrote, contributed to, and * maintained that driver (including Brad McLean, Shaun Savage, * Bill Earnest, Larry Doolittle, Roger Sunshine, John Luckey, * Matt Postiff, Peter Lu, zerucha@shell.portal.com, and Eric * Youngdale). I should also mention the driver written by * Hamish Macdonald for the (GASP!) Amiga A2091 card, included * in the Linux-m68k distribution; it gave me a good initial * understanding of the proper way to run a WD33c93 chip, and I * ended up stealing lots of code from it. * * _This_ driver is (I feel) an improvement over the old one in * several respects: * - All problems relating to the data size of a SCSI request are * gone (as far as I know). The old driver couldn't handle * swapping to partitions because that involved 4k blocks, nor * could it deal with the st.c tape driver unmodified, because * that usually involved 4k - 32k blocks. The old driver never * quite got away from a morbid dependence on 2k block sizes - * which of course is the size of the card's fifo. * * - Target Disconnection/Reconnection is now supported. Any * system with more than one device active on the SCSI bus * will benefit from this. The driver defaults to what I'm * calling 'adaptive disconnect' - meaning that each command * is evaluated individually as to whether or not it should * be run with the option to disconnect/reselect (if the * device chooses), or as a "SCSI-bus-hog". * * - Synchronous data transfers are now supported. Because there * are a few devices (and many improperly terminated systems) * that choke when doing sync, the default is sync DISABLED * for all devices. This faster protocol can (and should!) * be enabled on selected devices via the command-line. * * - Runtime operating parameters can now be specified through * either the LILO or the 'insmod' command line. For LILO do: * "in2000=blah,blah,blah" * and with insmod go like: * "insmod /usr/src/linux/modules/in2000.o setup_strings=blah,blah" * The defaults should be good for most people. See the comment * for 'setup_strings' below for more details. * * - The old driver relied exclusively on what the Western Digital * docs call "Combination Level 2 Commands", which are a great * idea in that the CPU is relieved of a lot of interrupt * overhead. However, by accepting a certain (user-settable) * amount of additional interrupts, this driver achieves * better control over the SCSI bus, and data transfers are * almost as fast while being much easier to define, track, * and debug. * * - You can force detection of a card whose BIOS has been disabled. * * - Multiple IN2000 cards might almost be supported. I've tried to * keep it in mind, but have no way to test... * * * TODO: * tagged queuing. multiple cards. * * * NOTE: * When using this or any other SCSI driver as a module, you'll * find that with the stock kernel, at most _two_ SCSI hard * drives will be linked into the device list (ie, usable). * If your IN2000 card has more than 2 disks on its bus, you * might want to change the define of 'SD_EXTRA_DEVS' in the * 'hosts.h' file from 2 to whatever is appropriate. It took * me a while to track down this surprisingly obscure and * undocumented little "feature". * * * People with bug reports, wish-lists, complaints, comments, * or improvements are asked to pah-leeez email me (John Shifflett) * at john@geolog.com or jshiffle@netcom.com! I'm anxious to get * this thing into as good a shape as possible, and I'm positive * there are lots of lurking bugs and "Stupid Places". * * Updated for Linux 2.5 by Alan Cox <alan@redhat.com> * - Using new_eh handler * - Hopefully got all the locking right again * See "FIXME" notes for items that could do with more work */ #include <linux/module.h> #include <linux/blkdev.h> #include <linux/interrupt.h> #include <linux/string.h> #include <linux/delay.h> #include <linux/proc_fs.h> #include <linux/ioport.h> #include <linux/stat.h> #include <asm/io.h> #include <asm/system.h> #include "scsi.h" #include <scsi/scsi_host.h> #define IN2000_VERSION "1.33-2.5" #define IN2000_DATE "2002/11/03" #include "in2000.h" /* * 'setup_strings' is a single string used to pass operating parameters and * settings from the kernel/module command-line to the driver. 'setup_args[]' * is an array of strings that define the compile-time default values for * these settings. If Linux boots with a LILO or insmod command-line, those * settings are combined with 'setup_args[]'. Note that LILO command-lines * are prefixed with "in2000=" while insmod uses a "setup_strings=" prefix. * The driver recognizes the following keywords (lower case required) and * arguments: * * - ioport:addr -Where addr is IO address of a (usually ROM-less) card. * - noreset -No optional args. Prevents SCSI bus reset at boot time. * - nosync:x -x is a bitmask where the 1st 7 bits correspond with * the 7 possible SCSI devices (bit 0 for device #0, etc). * Set a bit to PREVENT sync negotiation on that device. * The driver default is sync DISABLED on all devices. * - period:ns -ns is the minimum # of nanoseconds in a SCSI data transfer * period. Default is 500; acceptable values are 250 - 1000. * - disconnect:x -x = 0 to never allow disconnects, 2 to always allow them. * x = 1 does 'adaptive' disconnects, which is the default * and generally the best choice. * - debug:x -If 'DEBUGGING_ON' is defined, x is a bitmask that causes * various types of debug output to printed - see the DB_xxx * defines in in2000.h * - proc:x -If 'PROC_INTERFACE' is defined, x is a bitmask that * determines how the /proc interface works and what it * does - see the PR_xxx defines in in2000.h * * Syntax Notes: * - Numeric arguments can be decimal or the '0x' form of hex notation. There * _must_ be a colon between a keyword and its numeric argument, with no * spaces. * - Keywords are separated by commas, no spaces, in the standard kernel * command-line manner. * - A keyword in the 'nth' comma-separated command-line member will overwrite * the 'nth' element of setup_args[]. A blank command-line member (in * other words, a comma with no preceding keyword) will _not_ overwrite * the corresponding setup_args[] element. * * A few LILO examples (for insmod, use 'setup_strings' instead of 'in2000'): * - in2000=ioport:0x220,noreset * - in2000=period:250,disconnect:2,nosync:0x03 * - in2000=debug:0x1e * - in2000=proc:3 */ /* Normally, no defaults are specified... */ static char *setup_args[] = { "", "", "", "", "", "", "", "", "" }; /* filled in by 'insmod' */ static char *setup_strings; module_param(setup_strings, charp, 0); static inline uchar read_3393(struct IN2000_hostdata *hostdata, uchar reg_num) { write1_io(reg_num, IO_WD_ADDR); return read1_io(IO_WD_DATA); } #define READ_AUX_STAT() read1_io(IO_WD_ASR) static inline void write_3393(struct IN2000_hostdata *hostdata, uchar reg_num, uchar value) { write1_io(reg_num, IO_WD_ADDR); write1_io(value, IO_WD_DATA); } static inline void write_3393_cmd(struct IN2000_hostdata *hostdata, uchar cmd) { /* while (READ_AUX_STAT() & ASR_CIP) printk("|");*/ write1_io(WD_COMMAND, IO_WD_ADDR); write1_io(cmd, IO_WD_DATA); } static uchar read_1_byte(struct IN2000_hostdata *hostdata) { uchar asr, x = 0; write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); write_3393_cmd(hostdata, WD_CMD_TRANS_INFO | 0x80); do { asr = READ_AUX_STAT(); if (asr & ASR_DBR) x = read_3393(hostdata, WD_DATA); } while (!(asr & ASR_INT)); return x; } static void write_3393_count(struct IN2000_hostdata *hostdata, unsigned long value) { write1_io(WD_TRANSFER_COUNT_MSB, IO_WD_ADDR); write1_io((value >> 16), IO_WD_DATA); write1_io((value >> 8), IO_WD_DATA); write1_io(value, IO_WD_DATA); } static unsigned long read_3393_count(struct IN2000_hostdata *hostdata) { unsigned long value; write1_io(WD_TRANSFER_COUNT_MSB, IO_WD_ADDR); value = read1_io(IO_WD_DATA) << 16; value |= read1_io(IO_WD_DATA) << 8; value |= read1_io(IO_WD_DATA); return value; } /* The 33c93 needs to be told which direction a command transfers its * data; we use this function to figure it out. Returns true if there * will be a DATA_OUT phase with this command, false otherwise. * (Thanks to Joerg Dorchain for the research and suggestion.) */ static int is_dir_out(Scsi_Cmnd * cmd) { switch (cmd->cmnd[0]) { case WRITE_6: case WRITE_10: case WRITE_12: case WRITE_LONG: case WRITE_SAME: case WRITE_BUFFER: case WRITE_VERIFY: case WRITE_VERIFY_12: case COMPARE: case COPY: case COPY_VERIFY: case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW: case SEARCH_EQUAL_12: case SEARCH_HIGH_12: case SEARCH_LOW_12: case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE: case MODE_SELECT: case MODE_SELECT_10: case LOG_SELECT: case SEND_DIAGNOSTIC: case CHANGE_DEFINITION: case UPDATE_BLOCK: case SET_WINDOW: case MEDIUM_SCAN: case SEND_VOLUME_TAG: case 0xea: return 1; default: return 0; } } static struct sx_period sx_table[] = { {1, 0x20}, {252, 0x20}, {376, 0x30}, {500, 0x40}, {624, 0x50}, {752, 0x60}, {876, 0x70}, {1000, 0x00}, {0, 0} }; static int round_period(unsigned int period) { int x; for (x = 1; sx_table[x].period_ns; x++) { if ((period <= sx_table[x - 0].period_ns) && (period > sx_table[x - 1].period_ns)) { return x; } } return 7; } static uchar calc_sync_xfer(unsigned int period, unsigned int offset) { uchar result; period *= 4; /* convert SDTR code to ns */ result = sx_table[round_period(period)].reg_value; result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF; return result; } static void in2000_execute(struct Scsi_Host *instance); static int in2000_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) { struct Scsi_Host *instance; struct IN2000_hostdata *hostdata; Scsi_Cmnd *tmp; instance = cmd->device->host; hostdata = (struct IN2000_hostdata *) instance->hostdata; DB(DB_QUEUE_COMMAND, scmd_printk(KERN_DEBUG, cmd, "Q-%02x-%ld(", cmd->cmnd[0], cmd->serial_number)) /* Set up a few fields in the Scsi_Cmnd structure for our own use: * - host_scribble is the pointer to the next cmd in the input queue * - scsi_done points to the routine we call when a cmd is finished * - result is what you'd expect */ cmd->host_scribble = NULL; cmd->scsi_done = done; cmd->result = 0; /* We use the Scsi_Pointer structure that's included with each command * as a scratchpad (as it's intended to be used!). The handy thing about * the SCp.xxx fields is that they're always associated with a given * cmd, and are preserved across disconnect-reselect. This means we * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages * if we keep all the critical pointers and counters in SCp: * - SCp.ptr is the pointer into the RAM buffer * - SCp.this_residual is the size of that buffer * - SCp.buffer points to the current scatter-gather buffer * - SCp.buffers_residual tells us how many S.G. buffers there are * - SCp.have_data_in helps keep track of >2048 byte transfers * - SCp.sent_command is not used * - SCp.phase records this command's SRCID_ER bit setting */ if (scsi_bufflen(cmd)) { cmd->SCp.buffer = scsi_sglist(cmd); cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); cmd->SCp.this_residual = cmd->SCp.buffer->length; } else { cmd->SCp.buffer = NULL; cmd->SCp.buffers_residual = 0; cmd->SCp.ptr = NULL; cmd->SCp.this_residual = 0; } cmd->SCp.have_data_in = 0; /* We don't set SCp.phase here - that's done in in2000_execute() */ /* WD docs state that at the conclusion of a "LEVEL2" command, the * status byte can be retrieved from the LUN register. Apparently, * this is the case only for *uninterrupted* LEVEL2 commands! If * there are any unexpected phases entered, even if they are 100% * legal (different devices may choose to do things differently), * the LEVEL2 command sequence is exited. This often occurs prior * to receiving the status byte, in which case the driver does a * status phase interrupt and gets the status byte on its own. * While such a command can then be "resumed" (ie restarted to * finish up as a LEVEL2 command), the LUN register will NOT be * a valid status byte at the command's conclusion, and we must * use the byte obtained during the earlier interrupt. Here, we * preset SCp.Status to an illegal value (0xff) so that when * this command finally completes, we can tell where the actual * status byte is stored. */ cmd->SCp.Status = ILLEGAL_STATUS_BYTE; /* We need to disable interrupts before messing with the input * queue and calling in2000_execute(). */ /* * Add the cmd to the end of 'input_Q'. Note that REQUEST_SENSE * commands are added to the head of the queue so that the desired * sense data is not lost before REQUEST_SENSE executes. */ if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) { cmd->host_scribble = (uchar *) hostdata->input_Q; hostdata->input_Q = cmd; } else { /* find the end of the queue */ for (tmp = (Scsi_Cmnd *) hostdata->input_Q; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble); tmp->host_scribble = (uchar *) cmd; } /* We know that there's at least one command in 'input_Q' now. * Go see if any of them are runnable! */ in2000_execute(cmd->device->host); DB(DB_QUEUE_COMMAND, printk(")Q-%ld ", cmd->serial_number)) return 0; } /* * This routine attempts to start a scsi command. If the host_card is * already connected, we give up immediately. Otherwise, look through * the input_Q, using the first command we find that's intended * for a currently non-busy target/lun. * Note that this function is always called with interrupts already * disabled (either from in2000_queuecommand() or in2000_intr()). */ static void in2000_execute(struct Scsi_Host *instance) { struct IN2000_hostdata *hostdata; Scsi_Cmnd *cmd, *prev; int i; unsigned short *sp; unsigned short f; unsigned short flushbuf[16]; hostdata = (struct IN2000_hostdata *) instance->hostdata; DB(DB_EXECUTE, printk("EX(")) if (hostdata->selecting || hostdata->connected) { DB(DB_EXECUTE, printk(")EX-0 ")) return; } /* * Search through the input_Q for a command destined * for an idle target/lun. */ cmd = (Scsi_Cmnd *) hostdata->input_Q; prev = NULL; while (cmd) { if (!(hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))) break; prev = cmd; cmd = (Scsi_Cmnd *) cmd->host_scribble; } /* quit if queue empty or all possible targets are busy */ if (!cmd) { DB(DB_EXECUTE, printk(")EX-1 ")) return; } /* remove command from queue */ if (prev) prev->host_scribble = cmd->host_scribble; else hostdata->input_Q = (Scsi_Cmnd *) cmd->host_scribble; #ifdef PROC_STATISTICS hostdata->cmd_cnt[cmd->device->id]++; #endif /* * Start the selection process */ if (is_dir_out(cmd)) write_3393(hostdata, WD_DESTINATION_ID, cmd->device->id); else write_3393(hostdata, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD); /* Now we need to figure out whether or not this command is a good * candidate for disconnect/reselect. We guess to the best of our * ability, based on a set of hierarchical rules. When several * devices are operating simultaneously, disconnects are usually * an advantage. In a single device system, or if only 1 device * is being accessed, transfers usually go faster if disconnects * are not allowed: * * + Commands should NEVER disconnect if hostdata->disconnect = * DIS_NEVER (this holds for tape drives also), and ALWAYS * disconnect if hostdata->disconnect = DIS_ALWAYS. * + Tape drive commands should always be allowed to disconnect. * + Disconnect should be allowed if disconnected_Q isn't empty. * + Commands should NOT disconnect if input_Q is empty. * + Disconnect should be allowed if there are commands in input_Q * for a different target/lun. In this case, the other commands * should be made disconnect-able, if not already. * * I know, I know - this code would flunk me out of any * "C Programming 101" class ever offered. But it's easy * to change around and experiment with for now. */ cmd->SCp.phase = 0; /* assume no disconnect */ if (hostdata->disconnect == DIS_NEVER) goto no; if (hostdata->disconnect == DIS_ALWAYS) goto yes; if (cmd->device->type == 1) /* tape drive? */ goto yes; if (hostdata->disconnected_Q) /* other commands disconnected? */ goto yes; if (!(hostdata->input_Q)) /* input_Q empty? */ goto no; for (prev = (Scsi_Cmnd *) hostdata->input_Q; prev; prev = (Scsi_Cmnd *) prev->host_scribble) { if ((prev->device->id != cmd->device->id) || (prev->device->lun != cmd->device->lun)) { for (prev = (Scsi_Cmnd *) hostdata->input_Q; prev; prev = (Scsi_Cmnd *) prev->host_scribble) prev->SCp.phase = 1; goto yes; } } goto no; yes: cmd->SCp.phase = 1; #ifdef PROC_STATISTICS hostdata->disc_allowed_cnt[cmd->device->id]++; #endif no: write_3393(hostdata, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0)); write_3393(hostdata, WD_TARGET_LUN, cmd->device->lun); write_3393(hostdata, WD_SYNCHRONOUS_TRANSFER, hostdata->sync_xfer[cmd->device->id]); hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); if ((hostdata->level2 <= L2_NONE) || (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) { /* * Do a 'Select-With-ATN' command. This will end with * one of the following interrupts: * CSR_RESEL_AM: failure - can try again later. * CSR_TIMEOUT: failure - give up. * CSR_SELECT: success - proceed. */ hostdata->selecting = cmd; /* Every target has its own synchronous transfer setting, kept in * the sync_xfer array, and a corresponding status byte in sync_stat[]. * Each target's sync_stat[] entry is initialized to SS_UNSET, and its * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET * means that the parameters are undetermined as yet, and that we * need to send an SDTR message to this device after selection is * complete. We set SS_FIRST to tell the interrupt routine to do so, * unless we don't want to even _try_ synchronous transfers: In this * case we set SS_SET to make the defaults final. */ if (hostdata->sync_stat[cmd->device->id] == SS_UNSET) { if (hostdata->sync_off & (1 << cmd->device->id)) hostdata->sync_stat[cmd->device->id] = SS_SET; else hostdata->sync_stat[cmd->device->id] = SS_FIRST; } hostdata->state = S_SELECTING; write_3393_count(hostdata, 0); /* this guarantees a DATA_PHASE interrupt */ write_3393_cmd(hostdata, WD_CMD_SEL_ATN); } else { /* * Do a 'Select-With-ATN-Xfer' command. This will end with * one of the following interrupts: * CSR_RESEL_AM: failure - can try again later. * CSR_TIMEOUT: failure - give up. * anything else: success - proceed. */ hostdata->connected = cmd; write_3393(hostdata, WD_COMMAND_PHASE, 0); /* copy command_descriptor_block into WD chip * (take advantage of auto-incrementing) */ write1_io(WD_CDB_1, IO_WD_ADDR); for (i = 0; i < cmd->cmd_len; i++) write1_io(cmd->cmnd[i], IO_WD_DATA); /* The wd33c93 only knows about Group 0, 1, and 5 commands when * it's doing a 'select-and-transfer'. To be safe, we write the * size of the CDB into the OWN_ID register for every case. This * way there won't be problems with vendor-unique, audio, etc. */ write_3393(hostdata, WD_OWN_ID, cmd->cmd_len); /* When doing a non-disconnect command, we can save ourselves a DATA * phase interrupt later by setting everything up now. With writes we * need to pre-fill the fifo; if there's room for the 32 flush bytes, * put them in there too - that'll avoid a fifo interrupt. Reads are * somewhat simpler. * KLUDGE NOTE: It seems that you can't completely fill the fifo here: * This results in the IO_FIFO_COUNT register rolling over to zero, * and apparently the gate array logic sees this as empty, not full, * so the 3393 chip is never signalled to start reading from the * fifo. Or maybe it's seen as a permanent fifo interrupt condition. * Regardless, we fix this by temporarily pretending that the fifo * is 16 bytes smaller. (I see now that the old driver has a comment * about "don't fill completely" in an analogous place - must be the * same deal.) This results in CDROM, swap partitions, and tape drives * needing an extra interrupt per write command - I think we can live * with that! */ if (!(cmd->SCp.phase)) { write_3393_count(hostdata, cmd->SCp.this_residual); write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_BUS); write1_io(0, IO_FIFO_WRITE); /* clear fifo counter, write mode */ if (is_dir_out(cmd)) { hostdata->fifo = FI_FIFO_WRITING; if ((i = cmd->SCp.this_residual) > (IN2000_FIFO_SIZE - 16)) i = IN2000_FIFO_SIZE - 16; cmd->SCp.have_data_in = i; /* this much data in fifo */ i >>= 1; /* Gulp. Assuming modulo 2. */ sp = (unsigned short *) cmd->SCp.ptr; f = hostdata->io_base + IO_FIFO; #ifdef FAST_WRITE_IO FAST_WRITE2_IO(); #else while (i--) write2_io(*sp++, IO_FIFO); #endif /* Is there room for the flush bytes? */ if (cmd->SCp.have_data_in <= ((IN2000_FIFO_SIZE - 16) - 32)) { sp = flushbuf; i = 16; #ifdef FAST_WRITE_IO FAST_WRITE2_IO(); #else while (i--) write2_io(0, IO_FIFO); #endif } } else { write1_io(0, IO_FIFO_READ); /* put fifo in read mode */ hostdata->fifo = FI_FIFO_READING; cmd->SCp.have_data_in = 0; /* nothing transferred yet */ } } else { write_3393_count(hostdata, 0); /* this guarantees a DATA_PHASE interrupt */ } hostdata->state = S_RUNNING_LEVEL2; write_3393_cmd(hostdata, WD_CMD_SEL_ATN_XFER); } /* * Since the SCSI bus can handle only 1 connection at a time, * we get out of here now. If the selection fails, or when * the command disconnects, we'll come back to this routine * to search the input_Q again... */ DB(DB_EXECUTE, printk("%s%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->serial_number)) } static void transfer_pio(uchar * buf, int cnt, int data_in_dir, struct IN2000_hostdata *hostdata) { uchar asr; DB(DB_TRANSFER, printk("(%p,%d,%s)", buf, cnt, data_in_dir ? "in" : "out")) write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); write_3393_count(hostdata, cnt); write_3393_cmd(hostdata, WD_CMD_TRANS_INFO); if (data_in_dir) { do { asr = READ_AUX_STAT(); if (asr & ASR_DBR) *buf++ = read_3393(hostdata, WD_DATA); } while (!(asr & ASR_INT)); } else { do { asr = READ_AUX_STAT(); if (asr & ASR_DBR) write_3393(hostdata, WD_DATA, *buf++); } while (!(asr & ASR_INT)); } /* Note: we are returning with the interrupt UN-cleared. * Since (presumably) an entire I/O operation has * completed, the bus phase is probably different, and * the interrupt routine will discover this when it * responds to the uncleared int. */ } static void transfer_bytes(Scsi_Cmnd * cmd, int data_in_dir) { struct IN2000_hostdata *hostdata; unsigned short *sp; unsigned short f; int i; hostdata = (struct IN2000_hostdata *) cmd->device->host->hostdata; /* Normally, you'd expect 'this_residual' to be non-zero here. * In a series of scatter-gather transfers, however, this * routine will usually be called with 'this_residual' equal * to 0 and 'buffers_residual' non-zero. This means that a * previous transfer completed, clearing 'this_residual', and * now we need to setup the next scatter-gather buffer as the * source or destination for THIS transfer. */ if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { ++cmd->SCp.buffer; --cmd->SCp.buffers_residual; cmd->SCp.this_residual = cmd->SCp.buffer->length; cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); } /* Set up hardware registers */ write_3393(hostdata, WD_SYNCHRONOUS_TRANSFER, hostdata->sync_xfer[cmd->device->id]); write_3393_count(hostdata, cmd->SCp.this_residual); write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_BUS); write1_io(0, IO_FIFO_WRITE); /* zero counter, assume write */ /* Reading is easy. Just issue the command and return - we'll * get an interrupt later when we have actual data to worry about. */ if (data_in_dir) { write1_io(0, IO_FIFO_READ); if ((hostdata->level2 >= L2_DATA) || (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) { write_3393(hostdata, WD_COMMAND_PHASE, 0x45); write_3393_cmd(hostdata, WD_CMD_SEL_ATN_XFER); hostdata->state = S_RUNNING_LEVEL2; } else write_3393_cmd(hostdata, WD_CMD_TRANS_INFO); hostdata->fifo = FI_FIFO_READING; cmd->SCp.have_data_in = 0; return; } /* Writing is more involved - we'll start the WD chip and write as * much data to the fifo as we can right now. Later interrupts will * write any bytes that don't make it at this stage. */ if ((hostdata->level2 >= L2_DATA) || (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) { write_3393(hostdata, WD_COMMAND_PHASE, 0x45); write_3393_cmd(hostdata, WD_CMD_SEL_ATN_XFER); hostdata->state = S_RUNNING_LEVEL2; } else write_3393_cmd(hostdata, WD_CMD_TRANS_INFO); hostdata->fifo = FI_FIFO_WRITING; sp = (unsigned short *) cmd->SCp.ptr; if ((i = cmd->SCp.this_residual) > IN2000_FIFO_SIZE) i = IN2000_FIFO_SIZE; cmd->SCp.have_data_in = i; i >>= 1; /* Gulp. We assume this_residual is modulo 2 */ f = hostdata->io_base + IO_FIFO; #ifdef FAST_WRITE_IO FAST_WRITE2_IO(); #else while (i--) write2_io(*sp++, IO_FIFO); #endif } /* We need to use spin_lock_irqsave() & spin_unlock_irqrestore() in this * function in order to work in an SMP environment. (I'd be surprised * if the driver is ever used by anyone on a real multi-CPU motherboard, * but it _does_ need to be able to compile and run in an SMP kernel.) */ static irqreturn_t in2000_intr(int irqnum, void *dev_id) { struct Scsi_Host *instance = dev_id; struct IN2000_hostdata *hostdata; Scsi_Cmnd *patch, *cmd; uchar asr, sr, phs, id, lun, *ucp, msg; int i, j; unsigned long length; unsigned short *sp; unsigned short f; unsigned long flags; hostdata = (struct IN2000_hostdata *) instance->hostdata; /* Get the spin_lock and disable further ints, for SMP */ spin_lock_irqsave(instance->host_lock, flags); #ifdef PROC_STATISTICS hostdata->int_cnt++; #endif /* The IN2000 card has 2 interrupt sources OR'ed onto its IRQ line - the * WD3393 chip and the 2k fifo (which is actually a dual-port RAM combined * with a big logic array, so it's a little different than what you might * expect). As far as I know, there's no reason that BOTH can't be active * at the same time, but there's a problem: while we can read the 3393 * to tell if _it_ wants an interrupt, I don't know of a way to ask the * fifo the same question. The best we can do is check the 3393 and if * it _isn't_ the source of the interrupt, then we can be pretty sure * that the fifo is the culprit. * UPDATE: I have it on good authority (Bill Earnest) that bit 0 of the * IO_FIFO_COUNT register mirrors the fifo interrupt state. I * assume that bit clear means interrupt active. As it turns * out, the driver really doesn't need to check for this after * all, so my remarks above about a 'problem' can safely be * ignored. The way the logic is set up, there's no advantage * (that I can see) to worrying about it. * * It seems that the fifo interrupt signal is negated when we extract * bytes during read or write bytes during write. * - fifo will interrupt when data is moving from it to the 3393, and * there are 31 (or less?) bytes left to go. This is sort of short- * sighted: what if you don't WANT to do more? In any case, our * response is to push more into the fifo - either actual data or


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