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xserver/hw/xfree86/os-support/linux/lnx_agp.c

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/*
* Abstraction of the AGP GART interface.
*
* This version is for Linux and Free/Open/NetBSD.
*
* Copyright © 2000 VA Linux Systems, Inc.
* Copyright © 2001 The XFree86 Project, Inc.
*/
#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif
#include <X11/X.h>
#include "xf86.h"
#include "xf86Priv.h"
#include "xf86_OSlib.h"
#include "xf86OSpriv.h"
#if defined(__linux__)
#include <asm/ioctl.h>
#include <linux/agpgart.h>
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
#include <sys/ioctl.h>
#include <sys/agpio.h>
#endif
#ifndef AGP_DEVICE
#define AGP_DEVICE "/dev/agpgart"
#endif
/* AGP page size is independent of the host page size. */
#ifndef AGP_PAGE_SIZE
#define AGP_PAGE_SIZE 4096
#endif
#define AGPGART_MAJOR_VERSION 0
#define AGPGART_MINOR_VERSION 99
static int gartFd = -1;
static int acquiredScreen = -1;
static Bool initDone = FALSE;
/*
* Close /dev/agpgart. This frees all associated memory allocated during
* this server generation.
*/
Bool
xf86GARTCloseScreen(int screenNum)
{
if (gartFd != -1) {
close(gartFd);
acquiredScreen = -1;
gartFd = -1;
initDone = FALSE;
}
return TRUE;
}
/*
* Open /dev/agpgart. Keep it open until xf86GARTCloseScreen is called.
*/
static Bool
GARTInit(int screenNum)
{
struct _agp_info agpinf;
if (initDone)
return gartFd != -1;
initDone = TRUE;
if (gartFd == -1)
gartFd = open(AGP_DEVICE, O_RDWR, 0);
else
return FALSE;
if (gartFd == -1) {
xf86DrvMsg(screenNum, X_ERROR,
"GARTInit: Unable to open " AGP_DEVICE " (%s)\n",
strerror(errno));
return FALSE;
}
xf86AcquireGART(-1);
/* Check the kernel driver version. */
if (ioctl(gartFd, AGPIOC_INFO, &agpinf) != 0) {
xf86DrvMsg(screenNum, X_ERROR,
"GARTInit: AGPIOC_INFO failed (%s)\n", strerror(errno));
close(gartFd);
gartFd = -1;
return FALSE;
}
xf86ReleaseGART(-1);
#if defined(__linux__)
/* Per Dave Jones, every effort will be made to keep the
* agpgart interface backwards compatible, so allow all
* future versions.
*/
if (
#if (AGPGART_MAJOR_VERSION > 0) /* quiet compiler */
agpinf.version.major < AGPGART_MAJOR_VERSION ||
#endif
(agpinf.version.major == AGPGART_MAJOR_VERSION &&
agpinf.version.minor < AGPGART_MINOR_VERSION)) {
xf86DrvMsg(screenNum, X_ERROR,
"GARTInit: Kernel agpgart driver version is not current"
" (%d.%d vs %d.%d)\n",
agpinf.version.major, agpinf.version.minor,
AGPGART_MAJOR_VERSION, AGPGART_MINOR_VERSION);
close(gartFd);
gartFd = -1;
return FALSE;
}
#endif
return TRUE;
}
Bool
xf86AgpGARTSupported(void)
{
return GARTInit(-1);
}
AgpInfoPtr
xf86GetAGPInfo(int screenNum)
{
struct _agp_info agpinf;
AgpInfoPtr info;
if (!GARTInit(screenNum))
return NULL;
if ((info = calloc(sizeof(AgpInfo), 1)) == NULL) {
xf86DrvMsg(screenNum, X_ERROR,
"xf86GetAGPInfo: Failed to allocate AgpInfo\n");
return NULL;
}
memset((char *) &agpinf, 0, sizeof(agpinf));
if (ioctl(gartFd, AGPIOC_INFO, &agpinf) != 0) {
xf86DrvMsg(screenNum, X_ERROR,
"xf86GetAGPInfo: AGPIOC_INFO failed (%s)\n",
strerror(errno));
return NULL;
}
info->bridgeId = agpinf.bridge_id;
info->agpMode = agpinf.agp_mode;
info->base = agpinf.aper_base;
info->size = agpinf.aper_size;
info->totalPages = agpinf.pg_total;
info->systemPages = agpinf.pg_system;
info->usedPages = agpinf.pg_used;
xf86DrvMsg(screenNum, X_INFO, "Kernel reported %zu total, %zu used\n",
agpinf.pg_total, agpinf.pg_used);
return info;
}
/*
* XXX If multiple screens can acquire the GART, should we have a reference
* count instead of using acquiredScreen?
*/
Bool
xf86AcquireGART(int screenNum)
{
if (screenNum != -1 && !GARTInit(screenNum))
return FALSE;
if (screenNum == -1 || acquiredScreen != screenNum) {
if (ioctl(gartFd, AGPIOC_ACQUIRE, 0) != 0) {
xf86DrvMsg(screenNum, X_WARNING,
"xf86AcquireGART: AGPIOC_ACQUIRE failed (%s)\n",
strerror(errno));
return FALSE;
}
acquiredScreen = screenNum;
}
return TRUE;
}
Bool
xf86ReleaseGART(int screenNum)
{
if (screenNum != -1 && !GARTInit(screenNum))
return FALSE;
if (acquiredScreen == screenNum) {
/*
* The FreeBSD agp driver removes allocations on release.
* The Linux driver doesn't. xf86ReleaseGART() is expected
* to give up access to the GART, but not to remove any
* allocations.
*/
#if !defined(__linux__)
if (screenNum == -1)
#endif
{
if (ioctl(gartFd, AGPIOC_RELEASE, 0) != 0) {
xf86DrvMsg(screenNum, X_WARNING,
"xf86ReleaseGART: AGPIOC_RELEASE failed (%s)\n",
strerror(errno));
return FALSE;
}
acquiredScreen = -1;
}
return TRUE;
}
return FALSE;
}
int
xf86AllocateGARTMemory(int screenNum, unsigned long size, int type,
unsigned long *physical)
{
struct _agp_allocate alloc;
int pages;
/*
* Allocates "size" bytes of GART memory (rounds up to the next
* page multiple) or type "type". A handle (key) for the allocated
* memory is returned. On error, the return value is -1.
*/
if (!GARTInit(screenNum) || acquiredScreen != screenNum)
return -1;
pages = (size / AGP_PAGE_SIZE);
if (size % AGP_PAGE_SIZE != 0)
pages++;
/* XXX check for pages == 0? */
alloc.pg_count = pages;
alloc.type = type;
if (ioctl(gartFd, AGPIOC_ALLOCATE, &alloc) != 0) {
xf86DrvMsg(screenNum, X_WARNING, "xf86AllocateGARTMemory: "
"allocation of %d pages failed\n\t(%s)\n", pages,
strerror(errno));
return -1;
}
if (physical)
*physical = alloc.physical;
return alloc.key;
}
Bool
xf86DeallocateGARTMemory(int screenNum, int key)
{
if (!GARTInit(screenNum) || acquiredScreen != screenNum)
return FALSE;
if (acquiredScreen != screenNum) {
xf86DrvMsg(screenNum, X_ERROR,
"xf86UnbindGARTMemory: AGP not acquired by this screen\n");
return FALSE;
}
#ifdef __linux__
if (ioctl(gartFd, AGPIOC_DEALLOCATE, (int *) (uintptr_t) key) != 0) {
#else
if (ioctl(gartFd, AGPIOC_DEALLOCATE, &key) != 0) {
#endif
xf86DrvMsg(screenNum, X_WARNING, "xf86DeAllocateGARTMemory: "
"deallocation gart memory with key %d failed\n\t(%s)\n",
key, strerror(errno));
return FALSE;
}
return TRUE;
}
/* Bind GART memory with "key" at "offset" */
Bool
xf86BindGARTMemory(int screenNum, int key, unsigned long offset)
{
struct _agp_bind bind;
int pageOffset;
if (!GARTInit(screenNum) || acquiredScreen != screenNum)
return FALSE;
if (acquiredScreen != screenNum) {
xf86DrvMsg(screenNum, X_ERROR,
"xf86BindGARTMemory: AGP not acquired by this screen\n");
return FALSE;
}
if (offset % AGP_PAGE_SIZE != 0) {
xf86DrvMsg(screenNum, X_WARNING, "xf86BindGARTMemory: "
"offset (0x%lx) is not page-aligned (%d)\n",
offset, AGP_PAGE_SIZE);
return FALSE;
}
pageOffset = offset / AGP_PAGE_SIZE;
xf86DrvMsgVerb(screenNum, X_INFO, 3,
"xf86BindGARTMemory: bind key %d at 0x%08lx "
"(pgoffset %d)\n", key, offset, pageOffset);
bind.pg_start = pageOffset;
bind.key = key;
if (ioctl(gartFd, AGPIOC_BIND, &bind) != 0) {
xf86DrvMsg(screenNum, X_WARNING, "xf86BindGARTMemory: "
"binding of gart memory with key %d\n"
"\tat offset 0x%lx failed (%s)\n",
key, offset, strerror(errno));
return FALSE;
}
return TRUE;
}
/* Unbind GART memory with "key" */
Bool
xf86UnbindGARTMemory(int screenNum, int key)
{
struct _agp_unbind unbind;
if (!GARTInit(screenNum) || acquiredScreen != screenNum)
return FALSE;
if (acquiredScreen != screenNum) {
xf86DrvMsg(screenNum, X_ERROR,
"xf86UnbindGARTMemory: AGP not acquired by this screen\n");
return FALSE;
}
unbind.priority = 0;
unbind.key = key;
if (ioctl(gartFd, AGPIOC_UNBIND, &unbind) != 0) {
xf86DrvMsg(screenNum, X_WARNING, "xf86UnbindGARTMemory: "
"unbinding of gart memory with key %d "
"failed (%s)\n", key, strerror(errno));
return FALSE;
}
xf86DrvMsgVerb(screenNum, X_INFO, 3,
"xf86UnbindGARTMemory: unbind key %d\n", key);
return TRUE;
}
/* XXX Interface may change. */
Bool
xf86EnableAGP(int screenNum, CARD32 mode)
{
agp_setup setup;
if (!GARTInit(screenNum) || acquiredScreen != screenNum)
return FALSE;
setup.agp_mode = mode;
if (ioctl(gartFd, AGPIOC_SETUP, &setup) != 0) {
xf86DrvMsg(screenNum, X_WARNING, "xf86EnableAGP: "
"AGPIOC_SETUP with mode %ld failed (%s)\n",
(unsigned long) mode, strerror(errno));
return FALSE;
}
return TRUE;
}
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