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kernel_optimize_test/sound/pci/au88x0/au88x0.h
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

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/*
* 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 of the License, 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 Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef __SOUND_AU88X0_H
#define __SOUND_AU88X0_H
#ifdef __KERNEL__
#include <sound/driver.h>
#include <linux/pci.h>
#include <asm/io.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#include <sound/mpu401.h>
#include <sound/hwdep.h>
#include <sound/ac97_codec.h>
#endif
#ifndef CHIP_AU8820
#include "au88x0_eq.h"
#include "au88x0_a3d.h"
#endif
#ifndef CHIP_AU8810
#include "au88x0_wt.h"
#endif
#define hwread(x,y) readl((x)+(y))
#define hwwrite(x,y,z) writel((z),(x)+(y))
/* Vortex MPU401 defines. */
#define MIDI_CLOCK_DIV 0x61
/* Standart MPU401 defines. */
#define MPU401_RESET 0xff
#define MPU401_ENTER_UART 0x3f
#define MPU401_ACK 0xfe
// Get src register value to convert from x to y.
#define SRC_RATIO(x,y) ((((x<<15)/y) + 1)/2)
/* FIFO software state constants. */
#define FIFO_STOP 0
#define FIFO_START 1
#define FIFO_PAUSE 2
/* IRQ flags */
#define IRQ_ERR_MASK 0x00ff
#define IRQ_FATAL 0x0001
#define IRQ_PARITY 0x0002
#define IRQ_REG 0x0004
#define IRQ_FIFO 0x0008
#define IRQ_DMA 0x0010
#define IRQ_PCMOUT 0x0020 /* PCM OUT page crossing */
#define IRQ_TIMER 0x1000
#define IRQ_MIDI 0x2000
#define IRQ_MODEM 0x4000
/* ADB Resource */
#define VORTEX_RESOURCE_DMA 0x00000000
#define VORTEX_RESOURCE_SRC 0x00000001
#define VORTEX_RESOURCE_MIXIN 0x00000002
#define VORTEX_RESOURCE_MIXOUT 0x00000003
#define VORTEX_RESOURCE_A3D 0x00000004
#define VORTEX_RESOURCE_LAST 0x00000005
/* codec io: VORTEX_CODEC_IO bits */
#define VORTEX_CODEC_ID_SHIFT 24
#define VORTEX_CODEC_WRITE 0x00800000
#define VORTEX_CODEC_ADDSHIFT 16
#define VORTEX_CODEC_ADDMASK 0x7f0000
#define VORTEX_CODEC_DATSHIFT 0
#define VORTEX_CODEC_DATMASK 0xffff
/* Check for SDAC bit in "Extended audio ID" AC97 register */
//#define VORTEX_IS_QUAD(x) (((x)->codec == NULL) ? 0 : ((x)->codec->ext_id&0x80))
#define VORTEX_IS_QUAD(x) ((x)->isquad)
/* Check if chip has bug. */
#define IS_BAD_CHIP(x) (\
(x->rev == 0xfe && x->device == PCI_DEVICE_ID_AUREAL_VORTEX_2) || \
(x->rev == 0xfe && x->device == PCI_DEVICE_ID_AUREAL_ADVANTAGE))
/* PCM devices */
#define VORTEX_PCM_ADB 0
#define VORTEX_PCM_SPDIF 1
#define VORTEX_PCM_A3D 2
#define VORTEX_PCM_WT 3
#define VORTEX_PCM_I2S 4
#define VORTEX_PCM_LAST 5
#define MIX_CAPT(x) (vortex->mixcapt[x])
#define MIX_PLAYB(x) (vortex->mixplayb[x])
#define MIX_SPDIF(x) (vortex->mixspdif[x])
#define NR_WTPB 0x20 /* WT channels per eahc bank. */
/* Structs */
typedef struct {
//int this_08; /* Still unknown */
int fifo_enabled; /* this_24 */
int fifo_status; /* this_1c */
u32 dma_ctrl; /* this_78 (ADB), this_7c (WT) */
int dma_unknown; /* this_74 (ADB), this_78 (WT). WDM: +8 */
int cfg0;
int cfg1;
int nr_ch; /* Nr of PCM channels in use */
int type; /* Output type (ac97, a3d, spdif, i2s, dsp) */
int dma; /* Hardware DMA index. */
int dir; /* Stream Direction. */
u32 resources[5];
/* Virtual page extender stuff */
int nr_periods;
int period_bytes;
struct snd_sg_buf *sgbuf; /* DMA Scatter Gather struct */
int period_real;
int period_virt;
struct snd_pcm_substream *substream;
} stream_t;
typedef struct snd_vortex vortex_t;
struct snd_vortex {
/* ALSA structs. */
struct snd_card *card;
struct snd_pcm *pcm[VORTEX_PCM_LAST];
struct snd_rawmidi *rmidi; /* Legacy Midi interface. */
struct snd_ac97 *codec;
/* Stream structs. */
stream_t dma_adb[NR_ADB];
int spdif_sr;
#ifndef CHIP_AU8810
stream_t dma_wt[NR_WT];
wt_voice_t wt_voice[NR_WT]; /* WT register cache. */
char mixwt[(NR_WT / NR_WTPB) * 6]; /* WT mixin objects */
#endif
/* Global resources */
s8 mixcapt[2];
s8 mixplayb[4];
#ifndef CHIP_AU8820
s8 mixspdif[2];
s8 mixa3d[2]; /* mixers which collect all a3d streams. */
s8 mixxtlk[2]; /* crosstalk canceler mixer inputs. */
#endif
u32 fixed_res[5];
#ifndef CHIP_AU8820
/* Hardware equalizer structs */
eqlzr_t eq;
/* A3D structs */
a3dsrc_t a3d[NR_A3D];
/* Xtalk canceler */
int xt_mode; /* 1: speakers, 0:headphones. */
#endif
int isquad; /* cache of extended ID codec flag. */
/* Gameport stuff. */
struct gameport *gameport;
/* PCI hardware resources */
unsigned long io;
void __iomem *mmio;
unsigned int irq;
spinlock_t lock;
/* PCI device */
struct pci_dev *pci_dev;
u16 vendor;
u16 device;
u8 rev;
};
/* Functions. */
/* SRC */
static void vortex_adb_setsrc(vortex_t * vortex, int adbdma,
unsigned int cvrt, int dir);
/* DMA Engines. */
static void vortex_adbdma_setbuffers(vortex_t * vortex, int adbdma,
struct snd_sg_buf * sgbuf, int size,
int count);
static void vortex_adbdma_setmode(vortex_t * vortex, int adbdma, int ie,
int dir, int fmt, int d,
u32 offset);
static void vortex_adbdma_setstartbuffer(vortex_t * vortex, int adbdma, int sb);
#ifndef CHIP_AU8810
static void vortex_wtdma_setbuffers(vortex_t * vortex, int wtdma,
struct snd_sg_buf * sgbuf, int size,
int count);
static void vortex_wtdma_setmode(vortex_t * vortex, int wtdma, int ie, int fmt, int d, /*int e, */
u32 offset);
static void vortex_wtdma_setstartbuffer(vortex_t * vortex, int wtdma, int sb);
#endif
static void vortex_adbdma_startfifo(vortex_t * vortex, int adbdma);
//static void vortex_adbdma_stopfifo(vortex_t *vortex, int adbdma);
static void vortex_adbdma_pausefifo(vortex_t * vortex, int adbdma);
static void vortex_adbdma_resumefifo(vortex_t * vortex, int adbdma);
static int inline vortex_adbdma_getlinearpos(vortex_t * vortex, int adbdma);
static void vortex_adbdma_resetup(vortex_t *vortex, int adbdma);
#ifndef CHIP_AU8810
static void vortex_wtdma_startfifo(vortex_t * vortex, int wtdma);
static void vortex_wtdma_stopfifo(vortex_t * vortex, int wtdma);
static void vortex_wtdma_pausefifo(vortex_t * vortex, int wtdma);
static void vortex_wtdma_resumefifo(vortex_t * vortex, int wtdma);
static int inline vortex_wtdma_getlinearpos(vortex_t * vortex, int wtdma);
#endif
/* global stuff. */
static void vortex_codec_init(vortex_t * vortex);
static void vortex_codec_write(struct snd_ac97 * codec, unsigned short addr,
unsigned short data);
static unsigned short vortex_codec_read(struct snd_ac97 * codec, unsigned short addr);
static void vortex_spdif_init(vortex_t * vortex, int spdif_sr, int spdif_mode);
static int vortex_core_init(vortex_t * card);
static int vortex_core_shutdown(vortex_t * card);
static void vortex_enable_int(vortex_t * card);
static irqreturn_t vortex_interrupt(int irq, void *dev_id);
static int vortex_alsafmt_aspfmt(int alsafmt);
/* Connection stuff. */
static void vortex_connect_default(vortex_t * vortex, int en);
static int vortex_adb_allocroute(vortex_t * vortex, int dma, int nr_ch,
int dir, int type);
static char vortex_adb_checkinout(vortex_t * vortex, int resmap[], int out,
int restype);
#ifndef CHIP_AU8810
static int vortex_wt_allocroute(vortex_t * vortex, int dma, int nr_ch);
static void vortex_wt_connect(vortex_t * vortex, int en);
static void vortex_wt_init(vortex_t * vortex);
#endif
static void vortex_route(vortex_t * vortex, int en, unsigned char channel,
unsigned char source, unsigned char dest);
#if 0
static void vortex_routes(vortex_t * vortex, int en, unsigned char channel,
unsigned char source, unsigned char dest0,
unsigned char dest1);
#endif
static void vortex_connection_mixin_mix(vortex_t * vortex, int en,
unsigned char mixin,
unsigned char mix, int a);
static void vortex_mix_setinputvolumebyte(vortex_t * vortex,
unsigned char mix, int mixin,
unsigned char vol);
static void vortex_mix_setvolumebyte(vortex_t * vortex, unsigned char mix,
unsigned char vol);
/* A3D functions. */
#ifndef CHIP_AU8820
static void vortex_Vort3D_enable(vortex_t * v);
static void vortex_Vort3D_disable(vortex_t * v);
static void vortex_Vort3D_connect(vortex_t * vortex, int en);
static void vortex_Vort3D_InitializeSource(a3dsrc_t * a, int en);
#endif
/* Driver stuff. */
static int vortex_gameport_register(vortex_t * card);
static void vortex_gameport_unregister(vortex_t * card);
#ifndef CHIP_AU8820
static int vortex_eq_init(vortex_t * vortex);
static int vortex_eq_free(vortex_t * vortex);
#endif
/* ALSA stuff. */
static int snd_vortex_new_pcm(vortex_t * vortex, int idx, int nr);
static int snd_vortex_mixer(vortex_t * vortex);
static int snd_vortex_midi(vortex_t * vortex);
#endif
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