linux/drivers/video/vesafb.c
Thomas Schlichter 803a4e14a7 uvesafb,vesafb: create WC or WB PAT-entries
with an PAT-enabled kernel, when using uvesafb or vesafb, these drivers will
create uncached-minus PAT entries for the framebuffer memory because they use
ioremap() (not the *_cache or *_wc variants). When the framebuffer memory
intersects with the video RAM used by Xorg, the complete video RAM will be
mapped uncached-minus what results in a serve performance penalty.

Here are the correct MTRR entries created by uvesafb:
schlicht@netbook:~$ cat /proc/mtrr
reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back
reg01: base=0x06ff00000 ( 1791MB), size= 1MB, count=1: uncachable
reg02: base=0x070000000 ( 1792MB), size= 256MB, count=1: uncachable
reg03: base=0x0d0000000 ( 3328MB), size= 16MB, count=1: write-combining

And here are the problematic PAT entries:
schlicht@netbook:~$ sudo cat /sys/kernel/debug/x86/pat_memtype_list
PAT memtype list:
write-back @ 0x0-0x1000
uncached-minus @ 0x6fedd000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee3000-0x6fee4000
uncached-minus @ 0x6fee3000-0x6fee4000
uncached-minus @ 0x6fee3000-0x6fee4000
uncached-minus @ 0xd0000000-0xe0000000 <-- created by xserver-xorg
uncached-minus @ 0xd0000000-0xd1194000 <-- created by uvesafb
uncached-minus @ 0xf4000000-0xf4009000
uncached-minus @ 0xf4200000-0xf4400000
uncached-minus @ 0xf5000000-0xf5010000
uncached-minus @ 0xf5100000-0xf5104000
uncached-minus @ 0xf5400000-0xf5404000
uncached-minus @ 0xf5404000-0xf5405000
uncached-minus @ 0xf5404000-0xf5405000
uncached-minus @ 0xfed00000-0xfed01000

Therefore I created the attached patch for uvesafb which uses ioremap_wc() to
create the correct PAT entries, as shown below:
schlicht@netbook:~$ sudo cat /sys/kernel/debug/x86/pat_memtype_list
PAT memtype list:
write-back @ 0x0-0x1000
uncached-minus @ 0x6fedd000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee3000-0x6fee4000
uncached-minus @ 0x6fee3000-0x6fee4000
uncached-minus @ 0x6fee3000-0x6fee4000
write-combining @ 0xd0000000-0xe0000000
write-combining @ 0xd0000000-0xd1194000
uncached-minus @ 0xf4000000-0xf4009000
uncached-minus @ 0xf4200000-0xf4400000
uncached-minus @ 0xf5000000-0xf5010000
uncached-minus @ 0xf5100000-0xf5104000
uncached-minus @ 0xf5400000-0xf5404000
uncached-minus @ 0xf5404000-0xf5405000
uncached-minus @ 0xf5404000-0xf5405000
uncached-minus @ 0xfed00000-0xfed01000

This results in a performance gain, objectively measurable with e.g.
x11perf -comppixwin10 -comppixwin100 -comppixwin500:
1: x11perf_xaa.log
2: x11perf_xaa_patched.log

       1                2 Operation
-------- ---------------- -----------------
124000.0 202000.0 ( 1.63) Composite 10x10 from pixmap to window
  3340.0  24400.0 ( 7.31) Composite 100x100 from pixmap to window
   131.0   1150.0 ( 8.78) Composite 500x500 from pixmap to window

You can see the serve performance gain when composing larger pixmaps to window.

The patches replace the ioremap() function with the variant matching the mtrr-
parameter. To create "write-back" PAT entries, the ioremap_cache() function
must be called after creating the MTRR entries, and the ioremap_cache() region
must completely fit into the MTRR region, this is why the MTRR region size is
now rounded up to the next power-of-two.

Signed-off-by: Thomas Schlichter <thomas.schlichter@web.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2011-03-22 16:20:44 +09:00

535 lines
15 KiB
C

/*
* framebuffer driver for VBE 2.0 compliant graphic boards
*
* switching to graphics mode happens at boot time (while
* running in real mode, see arch/i386/boot/video.S).
*
* (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/screen_info.h>
#include <video/vga.h>
#include <asm/io.h>
#include <asm/mtrr.h>
#define dac_reg (0x3c8)
#define dac_val (0x3c9)
/* --------------------------------------------------------------------- */
static struct fb_var_screeninfo vesafb_defined __initdata = {
.activate = FB_ACTIVATE_NOW,
.height = -1,
.width = -1,
.right_margin = 32,
.upper_margin = 16,
.lower_margin = 4,
.vsync_len = 4,
.vmode = FB_VMODE_NONINTERLACED,
};
static struct fb_fix_screeninfo vesafb_fix __initdata = {
.id = "VESA VGA",
.type = FB_TYPE_PACKED_PIXELS,
.accel = FB_ACCEL_NONE,
};
static int inverse __read_mostly;
static int mtrr __read_mostly; /* disable mtrr */
static int vram_remap __initdata; /* Set amount of memory to be used */
static int vram_total __initdata; /* Set total amount of memory */
static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */
static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */
static void (*pmi_start)(void) __read_mostly;
static void (*pmi_pal) (void) __read_mostly;
static int depth __read_mostly;
static int vga_compat __read_mostly;
/* --------------------------------------------------------------------- */
static int vesafb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
#ifdef __i386__
int offset;
offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
__asm__ __volatile__(
"call *(%%edi)"
: /* no return value */
: "a" (0x4f07), /* EAX */
"b" (0), /* EBX */
"c" (offset), /* ECX */
"d" (offset >> 16), /* EDX */
"D" (&pmi_start)); /* EDI */
#endif
return 0;
}
static int vesa_setpalette(int regno, unsigned red, unsigned green,
unsigned blue)
{
int shift = 16 - depth;
int err = -EINVAL;
/*
* Try VGA registers first...
*/
if (vga_compat) {
outb_p(regno, dac_reg);
outb_p(red >> shift, dac_val);
outb_p(green >> shift, dac_val);
outb_p(blue >> shift, dac_val);
err = 0;
}
#ifdef __i386__
/*
* Fallback to the PMI....
*/
if (err && pmi_setpal) {
struct { u_char blue, green, red, pad; } entry;
entry.red = red >> shift;
entry.green = green >> shift;
entry.blue = blue >> shift;
entry.pad = 0;
__asm__ __volatile__(
"call *(%%esi)"
: /* no return value */
: "a" (0x4f09), /* EAX */
"b" (0), /* EBX */
"c" (1), /* ECX */
"d" (regno), /* EDX */
"D" (&entry), /* EDI */
"S" (&pmi_pal)); /* ESI */
err = 0;
}
#endif
return err;
}
static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp,
struct fb_info *info)
{
int err = 0;
/*
* Set a single color register. The values supplied are
* already rounded down to the hardware's capabilities
* (according to the entries in the `var' structure). Return
* != 0 for invalid regno.
*/
if (regno >= info->cmap.len)
return 1;
if (info->var.bits_per_pixel == 8)
err = vesa_setpalette(regno,red,green,blue);
else if (regno < 16) {
switch (info->var.bits_per_pixel) {
case 16:
if (info->var.red.offset == 10) {
/* 1:5:5:5 */
((u32*) (info->pseudo_palette))[regno] =
((red & 0xf800) >> 1) |
((green & 0xf800) >> 6) |
((blue & 0xf800) >> 11);
} else {
/* 0:5:6:5 */
((u32*) (info->pseudo_palette))[regno] =
((red & 0xf800) ) |
((green & 0xfc00) >> 5) |
((blue & 0xf800) >> 11);
}
break;
case 24:
case 32:
red >>= 8;
green >>= 8;
blue >>= 8;
((u32 *)(info->pseudo_palette))[regno] =
(red << info->var.red.offset) |
(green << info->var.green.offset) |
(blue << info->var.blue.offset);
break;
}
}
return err;
}
static void vesafb_destroy(struct fb_info *info)
{
if (info->screen_base)
iounmap(info->screen_base);
release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
framebuffer_release(info);
}
static struct fb_ops vesafb_ops = {
.owner = THIS_MODULE,
.fb_destroy = vesafb_destroy,
.fb_setcolreg = vesafb_setcolreg,
.fb_pan_display = vesafb_pan_display,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
static int __init vesafb_setup(char *options)
{
char *this_opt;
if (!options || !*options)
return 0;
while ((this_opt = strsep(&options, ",")) != NULL) {
if (!*this_opt) continue;
if (! strcmp(this_opt, "inverse"))
inverse=1;
else if (! strcmp(this_opt, "redraw"))
ypan=0;
else if (! strcmp(this_opt, "ypan"))
ypan=1;
else if (! strcmp(this_opt, "ywrap"))
ypan=2;
else if (! strcmp(this_opt, "vgapal"))
pmi_setpal=0;
else if (! strcmp(this_opt, "pmipal"))
pmi_setpal=1;
else if (! strncmp(this_opt, "mtrr:", 5))
mtrr = simple_strtoul(this_opt+5, NULL, 0);
else if (! strcmp(this_opt, "nomtrr"))
mtrr=0;
else if (! strncmp(this_opt, "vtotal:", 7))
vram_total = simple_strtoul(this_opt+7, NULL, 0);
else if (! strncmp(this_opt, "vremap:", 7))
vram_remap = simple_strtoul(this_opt+7, NULL, 0);
}
return 0;
}
static int __init vesafb_probe(struct platform_device *dev)
{
struct fb_info *info;
int i, err;
unsigned int size_vmode;
unsigned int size_remap;
unsigned int size_total;
if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
return -ENODEV;
vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
vesafb_fix.smem_start = screen_info.lfb_base;
vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
if (15 == vesafb_defined.bits_per_pixel)
vesafb_defined.bits_per_pixel = 16;
vesafb_defined.xres = screen_info.lfb_width;
vesafb_defined.yres = screen_info.lfb_height;
vesafb_fix.line_length = screen_info.lfb_linelength;
vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ?
FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
/* size_vmode -- that is the amount of memory needed for the
* used video mode, i.e. the minimum amount of
* memory we need. */
size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
/* size_total -- all video memory we have. Used for mtrr
* entries, resource allocation and bounds
* checking. */
size_total = screen_info.lfb_size * 65536;
if (vram_total)
size_total = vram_total * 1024 * 1024;
if (size_total < size_vmode)
size_total = size_vmode;
/* size_remap -- the amount of video memory we are going to
* use for vesafb. With modern cards it is no
* option to simply use size_total as that
* wastes plenty of kernel address space. */
size_remap = size_vmode * 2;
if (vram_remap)
size_remap = vram_remap * 1024 * 1024;
if (size_remap < size_vmode)
size_remap = size_vmode;
if (size_remap > size_total)
size_remap = size_total;
vesafb_fix.smem_len = size_remap;
#ifndef __i386__
screen_info.vesapm_seg = 0;
#endif
if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
printk(KERN_WARNING
"vesafb: cannot reserve video memory at 0x%lx\n",
vesafb_fix.smem_start);
/* We cannot make this fatal. Sometimes this comes from magic
spaces our resource handlers simply don't know about */
}
info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
if (!info) {
release_mem_region(vesafb_fix.smem_start, size_total);
return -ENOMEM;
}
info->pseudo_palette = info->par;
info->par = NULL;
/* set vesafb aperture size for generic probing */
info->apertures = alloc_apertures(1);
if (!info->apertures) {
err = -ENOMEM;
goto err;
}
info->apertures->ranges[0].base = screen_info.lfb_base;
info->apertures->ranges[0].size = size_total;
printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
if (screen_info.vesapm_seg) {
printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
screen_info.vesapm_seg,screen_info.vesapm_off);
}
if (screen_info.vesapm_seg < 0xc000)
ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
if (ypan || pmi_setpal) {
unsigned short *pmi_base;
pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
pmi_pal = (void*)((char*)pmi_base + pmi_base[2]);
printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
if (pmi_base[3]) {
printk(KERN_INFO "vesafb: pmi: ports = ");
for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
printk("%x ",pmi_base[i]);
printk("\n");
if (pmi_base[i] != 0xffff) {
/*
* memory areas not supported (yet?)
*
* Rules are: we have to set up a descriptor for the requested
* memory area and pass it in the ES register to the BIOS function.
*/
printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
ypan = pmi_setpal = 0;
}
}
}
if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
" colors may be incorrect\n");
vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
}
vesafb_defined.xres_virtual = vesafb_defined.xres;
vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
(ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
} else {
printk(KERN_INFO "vesafb: scrolling: redraw\n");
vesafb_defined.yres_virtual = vesafb_defined.yres;
ypan = 0;
}
/* some dummy values for timing to make fbset happy */
vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8;
vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8;
vesafb_defined.red.offset = screen_info.red_pos;
vesafb_defined.red.length = screen_info.red_size;
vesafb_defined.green.offset = screen_info.green_pos;
vesafb_defined.green.length = screen_info.green_size;
vesafb_defined.blue.offset = screen_info.blue_pos;
vesafb_defined.blue.length = screen_info.blue_size;
vesafb_defined.transp.offset = screen_info.rsvd_pos;
vesafb_defined.transp.length = screen_info.rsvd_size;
if (vesafb_defined.bits_per_pixel <= 8) {
depth = vesafb_defined.green.length;
vesafb_defined.red.length =
vesafb_defined.green.length =
vesafb_defined.blue.length =
vesafb_defined.bits_per_pixel;
}
printk(KERN_INFO "vesafb: %s: "
"size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
(vesafb_defined.bits_per_pixel > 8) ?
"Truecolor" : (vga_compat || pmi_setpal) ?
"Pseudocolor" : "Static Pseudocolor",
screen_info.rsvd_size,
screen_info.red_size,
screen_info.green_size,
screen_info.blue_size,
screen_info.rsvd_pos,
screen_info.red_pos,
screen_info.green_pos,
screen_info.blue_pos);
vesafb_fix.ypanstep = ypan ? 1 : 0;
vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
/* request failure does not faze us, as vgacon probably has this
* region already (FIXME) */
request_region(0x3c0, 32, "vesafb");
#ifdef CONFIG_MTRR
if (mtrr) {
unsigned int temp_size = size_total;
unsigned int type = 0;
switch (mtrr) {
case 1:
type = MTRR_TYPE_UNCACHABLE;
break;
case 2:
type = MTRR_TYPE_WRBACK;
break;
case 3:
type = MTRR_TYPE_WRCOMB;
break;
case 4:
type = MTRR_TYPE_WRTHROUGH;
break;
default:
type = 0;
break;
}
if (type) {
int rc;
/* Find the largest power-of-two */
temp_size = roundup_pow_of_two(temp_size);
/* Try and find a power of two to add */
do {
rc = mtrr_add(vesafb_fix.smem_start, temp_size,
type, 1);
temp_size >>= 1;
} while (temp_size >= PAGE_SIZE && rc == -EINVAL);
}
}
#endif
switch (mtrr) {
case 1: /* uncachable */
info->screen_base = ioremap_nocache(vesafb_fix.smem_start, vesafb_fix.smem_len);
break;
case 2: /* write-back */
info->screen_base = ioremap_cache(vesafb_fix.smem_start, vesafb_fix.smem_len);
break;
case 3: /* write-combining */
info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
break;
case 4: /* write-through */
default:
info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
break;
}
if (!info->screen_base) {
printk(KERN_ERR
"vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
vesafb_fix.smem_len, vesafb_fix.smem_start);
err = -EIO;
goto err;
}
printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
"using %dk, total %dk\n",
vesafb_fix.smem_start, info->screen_base,
size_remap/1024, size_total/1024);
info->fbops = &vesafb_ops;
info->var = vesafb_defined;
info->fix = vesafb_fix;
info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
(ypan ? FBINFO_HWACCEL_YPAN : 0);
if (!ypan)
info->fbops->fb_pan_display = NULL;
if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
err = -ENOMEM;
goto err;
}
if (register_framebuffer(info)<0) {
err = -EINVAL;
fb_dealloc_cmap(&info->cmap);
goto err;
}
printk(KERN_INFO "fb%d: %s frame buffer device\n",
info->node, info->fix.id);
return 0;
err:
if (info->screen_base)
iounmap(info->screen_base);
framebuffer_release(info);
release_mem_region(vesafb_fix.smem_start, size_total);
return err;
}
static struct platform_driver vesafb_driver = {
.driver = {
.name = "vesafb",
},
};
static struct platform_device *vesafb_device;
static int __init vesafb_init(void)
{
int ret;
char *option = NULL;
/* ignore error return of fb_get_options */
fb_get_options("vesafb", &option);
vesafb_setup(option);
vesafb_device = platform_device_alloc("vesafb", 0);
if (!vesafb_device)
return -ENOMEM;
ret = platform_device_add(vesafb_device);
if (!ret) {
ret = platform_driver_probe(&vesafb_driver, vesafb_probe);
if (ret)
platform_device_del(vesafb_device);
}
if (ret) {
platform_device_put(vesafb_device);
vesafb_device = NULL;
}
return ret;
}
module_init(vesafb_init);
MODULE_LICENSE("GPL");