linux/drivers/video/vfb.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

610 lines
14 KiB
C

/*
* linux/drivers/video/vfb.c -- Virtual frame buffer device
*
* Copyright (C) 2002 James Simmons
*
* Copyright (C) 1997 Geert Uytterhoeven
*
* 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.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/fb.h>
#include <linux/init.h>
/*
* RAM we reserve for the frame buffer. This defines the maximum screen
* size
*
* The default can be overridden if the driver is compiled as a module
*/
#define VIDEOMEMSIZE (1*1024*1024) /* 1 MB */
static void *videomemory;
static u_long videomemorysize = VIDEOMEMSIZE;
module_param(videomemorysize, ulong, 0);
/**********************************************************************
*
* Memory management
*
**********************************************************************/
static void *rvmalloc(unsigned long size)
{
void *mem;
unsigned long adr;
size = PAGE_ALIGN(size);
mem = vmalloc_32(size);
if (!mem)
return NULL;
memset(mem, 0, size); /* Clear the ram out, no junk to the user */
adr = (unsigned long) mem;
while (size > 0) {
SetPageReserved(vmalloc_to_page((void *)adr));
adr += PAGE_SIZE;
size -= PAGE_SIZE;
}
return mem;
}
static void rvfree(void *mem, unsigned long size)
{
unsigned long adr;
if (!mem)
return;
adr = (unsigned long) mem;
while ((long) size > 0) {
ClearPageReserved(vmalloc_to_page((void *)adr));
adr += PAGE_SIZE;
size -= PAGE_SIZE;
}
vfree(mem);
}
static struct fb_var_screeninfo vfb_default __initdata = {
.xres = 640,
.yres = 480,
.xres_virtual = 640,
.yres_virtual = 480,
.bits_per_pixel = 8,
.red = { 0, 8, 0 },
.green = { 0, 8, 0 },
.blue = { 0, 8, 0 },
.activate = FB_ACTIVATE_TEST,
.height = -1,
.width = -1,
.pixclock = 20000,
.left_margin = 64,
.right_margin = 64,
.upper_margin = 32,
.lower_margin = 32,
.hsync_len = 64,
.vsync_len = 2,
.vmode = FB_VMODE_NONINTERLACED,
};
static struct fb_fix_screeninfo vfb_fix __initdata = {
.id = "Virtual FB",
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_PSEUDOCOLOR,
.xpanstep = 1,
.ypanstep = 1,
.ywrapstep = 1,
.accel = FB_ACCEL_NONE,
};
static int vfb_enable __initdata = 0; /* disabled by default */
module_param(vfb_enable, bool, 0);
static int vfb_check_var(struct fb_var_screeninfo *var,
struct fb_info *info);
static int vfb_set_par(struct fb_info *info);
static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
u_int transp, struct fb_info *info);
static int vfb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info);
static int vfb_mmap(struct fb_info *info,
struct vm_area_struct *vma);
static struct fb_ops vfb_ops = {
.fb_read = fb_sys_read,
.fb_write = fb_sys_write,
.fb_check_var = vfb_check_var,
.fb_set_par = vfb_set_par,
.fb_setcolreg = vfb_setcolreg,
.fb_pan_display = vfb_pan_display,
.fb_fillrect = sys_fillrect,
.fb_copyarea = sys_copyarea,
.fb_imageblit = sys_imageblit,
.fb_mmap = vfb_mmap,
};
/*
* Internal routines
*/
static u_long get_line_length(int xres_virtual, int bpp)
{
u_long length;
length = xres_virtual * bpp;
length = (length + 31) & ~31;
length >>= 3;
return (length);
}
/*
* Setting the video mode has been split into two parts.
* First part, xxxfb_check_var, must not write anything
* to hardware, it should only verify and adjust var.
* This means it doesn't alter par but it does use hardware
* data from it to check this var.
*/
static int vfb_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
u_long line_length;
/*
* FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
* as FB_VMODE_SMOOTH_XPAN is only used internally
*/
if (var->vmode & FB_VMODE_CONUPDATE) {
var->vmode |= FB_VMODE_YWRAP;
var->xoffset = info->var.xoffset;
var->yoffset = info->var.yoffset;
}
/*
* Some very basic checks
*/
if (!var->xres)
var->xres = 1;
if (!var->yres)
var->yres = 1;
if (var->xres > var->xres_virtual)
var->xres_virtual = var->xres;
if (var->yres > var->yres_virtual)
var->yres_virtual = var->yres;
if (var->bits_per_pixel <= 1)
var->bits_per_pixel = 1;
else if (var->bits_per_pixel <= 8)
var->bits_per_pixel = 8;
else if (var->bits_per_pixel <= 16)
var->bits_per_pixel = 16;
else if (var->bits_per_pixel <= 24)
var->bits_per_pixel = 24;
else if (var->bits_per_pixel <= 32)
var->bits_per_pixel = 32;
else
return -EINVAL;
if (var->xres_virtual < var->xoffset + var->xres)
var->xres_virtual = var->xoffset + var->xres;
if (var->yres_virtual < var->yoffset + var->yres)
var->yres_virtual = var->yoffset + var->yres;
/*
* Memory limit
*/
line_length =
get_line_length(var->xres_virtual, var->bits_per_pixel);
if (line_length * var->yres_virtual > videomemorysize)
return -ENOMEM;
/*
* Now that we checked it we alter var. The reason being is that the video
* mode passed in might not work but slight changes to it might make it
* work. This way we let the user know what is acceptable.
*/
switch (var->bits_per_pixel) {
case 1:
case 8:
var->red.offset = 0;
var->red.length = 8;
var->green.offset = 0;
var->green.length = 8;
var->blue.offset = 0;
var->blue.length = 8;
var->transp.offset = 0;
var->transp.length = 0;
break;
case 16: /* RGBA 5551 */
if (var->transp.length) {
var->red.offset = 0;
var->red.length = 5;
var->green.offset = 5;
var->green.length = 5;
var->blue.offset = 10;
var->blue.length = 5;
var->transp.offset = 15;
var->transp.length = 1;
} else { /* RGB 565 */
var->red.offset = 0;
var->red.length = 5;
var->green.offset = 5;
var->green.length = 6;
var->blue.offset = 11;
var->blue.length = 5;
var->transp.offset = 0;
var->transp.length = 0;
}
break;
case 24: /* RGB 888 */
var->red.offset = 0;
var->red.length = 8;
var->green.offset = 8;
var->green.length = 8;
var->blue.offset = 16;
var->blue.length = 8;
var->transp.offset = 0;
var->transp.length = 0;
break;
case 32: /* RGBA 8888 */
var->red.offset = 0;
var->red.length = 8;
var->green.offset = 8;
var->green.length = 8;
var->blue.offset = 16;
var->blue.length = 8;
var->transp.offset = 24;
var->transp.length = 8;
break;
}
var->red.msb_right = 0;
var->green.msb_right = 0;
var->blue.msb_right = 0;
var->transp.msb_right = 0;
return 0;
}
/* This routine actually sets the video mode. It's in here where we
* the hardware state info->par and fix which can be affected by the
* change in par. For this driver it doesn't do much.
*/
static int vfb_set_par(struct fb_info *info)
{
info->fix.line_length = get_line_length(info->var.xres_virtual,
info->var.bits_per_pixel);
return 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.
*/
static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
u_int transp, struct fb_info *info)
{
if (regno >= 256) /* no. of hw registers */
return 1;
/*
* Program hardware... do anything you want with transp
*/
/* grayscale works only partially under directcolor */
if (info->var.grayscale) {
/* grayscale = 0.30*R + 0.59*G + 0.11*B */
red = green = blue =
(red * 77 + green * 151 + blue * 28) >> 8;
}
/* Directcolor:
* var->{color}.offset contains start of bitfield
* var->{color}.length contains length of bitfield
* {hardwarespecific} contains width of RAMDAC
* cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset)
* RAMDAC[X] is programmed to (red, green, blue)
*
* Pseudocolor:
* var->{color}.offset is 0 unless the palette index takes less than
* bits_per_pixel bits and is stored in the upper
* bits of the pixel value
* var->{color}.length is set so that 1 << length is the number of available
* palette entries
* cmap is not used
* RAMDAC[X] is programmed to (red, green, blue)
*
* Truecolor:
* does not use DAC. Usually 3 are present.
* var->{color}.offset contains start of bitfield
* var->{color}.length contains length of bitfield
* cmap is programmed to (red << red.offset) | (green << green.offset) |
* (blue << blue.offset) | (transp << transp.offset)
* RAMDAC does not exist
*/
#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
switch (info->fix.visual) {
case FB_VISUAL_TRUECOLOR:
case FB_VISUAL_PSEUDOCOLOR:
red = CNVT_TOHW(red, info->var.red.length);
green = CNVT_TOHW(green, info->var.green.length);
blue = CNVT_TOHW(blue, info->var.blue.length);
transp = CNVT_TOHW(transp, info->var.transp.length);
break;
case FB_VISUAL_DIRECTCOLOR:
red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */
green = CNVT_TOHW(green, 8);
blue = CNVT_TOHW(blue, 8);
/* hey, there is bug in transp handling... */
transp = CNVT_TOHW(transp, 8);
break;
}
#undef CNVT_TOHW
/* Truecolor has hardware independent palette */
if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
u32 v;
if (regno >= 16)
return 1;
v = (red << info->var.red.offset) |
(green << info->var.green.offset) |
(blue << info->var.blue.offset) |
(transp << info->var.transp.offset);
switch (info->var.bits_per_pixel) {
case 8:
break;
case 16:
((u32 *) (info->pseudo_palette))[regno] = v;
break;
case 24:
case 32:
((u32 *) (info->pseudo_palette))[regno] = v;
break;
}
return 0;
}
return 0;
}
/*
* Pan or Wrap the Display
*
* This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
*/
static int vfb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
if (var->vmode & FB_VMODE_YWRAP) {
if (var->yoffset < 0
|| var->yoffset >= info->var.yres_virtual
|| var->xoffset)
return -EINVAL;
} else {
if (var->xoffset + var->xres > info->var.xres_virtual ||
var->yoffset + var->yres > info->var.yres_virtual)
return -EINVAL;
}
info->var.xoffset = var->xoffset;
info->var.yoffset = var->yoffset;
if (var->vmode & FB_VMODE_YWRAP)
info->var.vmode |= FB_VMODE_YWRAP;
else
info->var.vmode &= ~FB_VMODE_YWRAP;
return 0;
}
/*
* Most drivers don't need their own mmap function
*/
static int vfb_mmap(struct fb_info *info,
struct vm_area_struct *vma)
{
unsigned long start = vma->vm_start;
unsigned long size = vma->vm_end - vma->vm_start;
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
unsigned long page, pos;
if (offset + size > info->fix.smem_len) {
return -EINVAL;
}
pos = (unsigned long)info->fix.smem_start + offset;
while (size > 0) {
page = vmalloc_to_pfn((void *)pos);
if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) {
return -EAGAIN;
}
start += PAGE_SIZE;
pos += PAGE_SIZE;
if (size > PAGE_SIZE)
size -= PAGE_SIZE;
else
size = 0;
}
vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
return 0;
}
#ifndef MODULE
/*
* The virtual framebuffer driver is only enabled if explicitly
* requested by passing 'video=vfb:' (or any actual options).
*/
static int __init vfb_setup(char *options)
{
char *this_opt;
vfb_enable = 0;
if (!options)
return 1;
vfb_enable = 1;
if (!*options)
return 1;
while ((this_opt = strsep(&options, ",")) != NULL) {
if (!*this_opt)
continue;
/* Test disable for backwards compatibility */
if (!strcmp(this_opt, "disable"))
vfb_enable = 0;
}
return 1;
}
#endif /* MODULE */
/*
* Initialisation
*/
static int __devinit vfb_probe(struct platform_device *dev)
{
struct fb_info *info;
int retval = -ENOMEM;
/*
* For real video cards we use ioremap.
*/
if (!(videomemory = rvmalloc(videomemorysize)))
return retval;
/*
* VFB must clear memory to prevent kernel info
* leakage into userspace
* VGA-based drivers MUST NOT clear memory if
* they want to be able to take over vgacon
*/
memset(videomemory, 0, videomemorysize);
info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
if (!info)
goto err;
info->screen_base = (char __iomem *)videomemory;
info->fbops = &vfb_ops;
retval = fb_find_mode(&info->var, info, NULL,
NULL, 0, NULL, 8);
if (!retval || (retval == 4))
info->var = vfb_default;
vfb_fix.smem_start = (unsigned long) videomemory;
vfb_fix.smem_len = videomemorysize;
info->fix = vfb_fix;
info->pseudo_palette = info->par;
info->par = NULL;
info->flags = FBINFO_FLAG_DEFAULT;
retval = fb_alloc_cmap(&info->cmap, 256, 0);
if (retval < 0)
goto err1;
retval = register_framebuffer(info);
if (retval < 0)
goto err2;
platform_set_drvdata(dev, info);
printk(KERN_INFO
"fb%d: Virtual frame buffer device, using %ldK of video memory\n",
info->node, videomemorysize >> 10);
return 0;
err2:
fb_dealloc_cmap(&info->cmap);
err1:
framebuffer_release(info);
err:
rvfree(videomemory, videomemorysize);
return retval;
}
static int vfb_remove(struct platform_device *dev)
{
struct fb_info *info = platform_get_drvdata(dev);
if (info) {
unregister_framebuffer(info);
rvfree(videomemory, videomemorysize);
fb_dealloc_cmap(&info->cmap);
framebuffer_release(info);
}
return 0;
}
static struct platform_driver vfb_driver = {
.probe = vfb_probe,
.remove = vfb_remove,
.driver = {
.name = "vfb",
},
};
static struct platform_device *vfb_device;
static int __init vfb_init(void)
{
int ret = 0;
#ifndef MODULE
char *option = NULL;
if (fb_get_options("vfb", &option))
return -ENODEV;
vfb_setup(option);
#endif
if (!vfb_enable)
return -ENXIO;
ret = platform_driver_register(&vfb_driver);
if (!ret) {
vfb_device = platform_device_alloc("vfb", 0);
if (vfb_device)
ret = platform_device_add(vfb_device);
else
ret = -ENOMEM;
if (ret) {
platform_device_put(vfb_device);
platform_driver_unregister(&vfb_driver);
}
}
return ret;
}
module_init(vfb_init);
#ifdef MODULE
static void __exit vfb_exit(void)
{
platform_device_unregister(vfb_device);
platform_driver_unregister(&vfb_driver);
}
module_exit(vfb_exit);
MODULE_LICENSE("GPL");
#endif /* MODULE */