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linux/drivers/video/fbdev/sbuslib.c
Thomas Zimmermann 76f92201b8 fbdev: Push pgprot_decrypted() into mmap implementations 
If a driver sets struct fb_ops.fb_mmap, the fbdev core automatically
calls pgprot_decrypted(). But the default fb_mmap code doesn't handle
pgprot_decrypted().

Move the call to pgprot_decrypted() into each drivers' fb_mmap function.
This only concerns fb_mmap functions for system and DMA memory. For
I/O memory, which is the default case, nothing changes. The fb_mmap
for I/O-memory can later be moved into a helper as well.

DRM's fbdev emulation handles pgprot_decrypted() internally via the
Prime helpers. Fbdev doesn't have to do anything in this case. In
cases where DRM uses deferred I/O, this patch updates fb_mmap correctly.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231127131655.4020-30-tzimmermann@suse.de
2023-11-29 12:20:44 +01:00

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// SPDX-License-Identifier: GPL-2.0
/* sbuslib.c: Helper library for SBUS framebuffer drivers.
*
* Copyright (C) 2003 David S. Miller (davem@redhat.com)
*/
#include <linux/compat.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/fb.h>
#include <linux/mm.h>
#include <linux/uaccess.h>
#include <linux/of.h>
#include <asm/fbio.h>
#include "sbuslib.h"
void sbusfb_fill_var(struct fb_var_screeninfo *var, struct device_node *dp,
int bpp)
{
memset(var, 0, sizeof(*var));
var->xres = of_getintprop_default(dp, "width", 1152);
var->yres = of_getintprop_default(dp, "height", 900);
var->xres_virtual = var->xres;
var->yres_virtual = var->yres;
var->bits_per_pixel = bpp;
}
EXPORT_SYMBOL(sbusfb_fill_var);
static unsigned long sbusfb_mmapsize(long size, unsigned long fbsize)
{
if (size == SBUS_MMAP_EMPTY) return 0;
if (size >= 0) return size;
return fbsize * (-size);
}
int sbusfb_mmap_helper(struct sbus_mmap_map *map,
unsigned long physbase,
unsigned long fbsize,
unsigned long iospace,
struct vm_area_struct *vma)
{
unsigned int size, page, r, map_size;
unsigned long map_offset = 0;
unsigned long off;
int i;
if (!(vma->vm_flags & (VM_SHARED | VM_MAYSHARE)))
return -EINVAL;
size = vma->vm_end - vma->vm_start;
if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
return -EINVAL;
off = vma->vm_pgoff << PAGE_SHIFT;
/* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
/* Each page, see which map applies */
for (page = 0; page < size; ){
map_size = 0;
for (i = 0; map[i].size; i++)
if (map[i].voff == off+page) {
map_size = sbusfb_mmapsize(map[i].size, fbsize);
#ifdef __sparc_v9__
#define POFF_MASK (PAGE_MASK|0x1UL)
#else
#define POFF_MASK (PAGE_MASK)
#endif
map_offset = (physbase + map[i].poff) & POFF_MASK;
break;
}
if (!map_size) {
page += PAGE_SIZE;
continue;
}
if (page + map_size > size)
map_size = size - page;
r = io_remap_pfn_range(vma,
vma->vm_start + page,
MK_IOSPACE_PFN(iospace,
map_offset >> PAGE_SHIFT),
map_size,
vma->vm_page_prot);
if (r)
return -EAGAIN;
page += map_size;
}
return 0;
}
EXPORT_SYMBOL(sbusfb_mmap_helper);
int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
struct fb_info *info,
int type, int fb_depth, unsigned long fb_size)
{
switch(cmd) {
case FBIOGTYPE: {
struct fbtype __user *f = (struct fbtype __user *) arg;
if (put_user(type, &f->fb_type) ||
put_user(info->var.yres, &f->fb_height) ||
put_user(info->var.xres, &f->fb_width) ||
put_user(fb_depth, &f->fb_depth) ||
put_user(0, &f->fb_cmsize) ||
put_user(fb_size, &f->fb_cmsize))
return -EFAULT;
return 0;
}
case FBIOPUTCMAP_SPARC: {
struct fbcmap __user *c = (struct fbcmap __user *) arg;
struct fb_cmap cmap;
u16 red, green, blue;
u8 red8, green8, blue8;
unsigned char __user *ured;
unsigned char __user *ugreen;
unsigned char __user *ublue;
unsigned int index, count, i;
if (get_user(index, &c->index) ||
get_user(count, &c->count) ||
get_user(ured, &c->red) ||
get_user(ugreen, &c->green) ||
get_user(ublue, &c->blue))
return -EFAULT;
cmap.len = 1;
cmap.red = &red;
cmap.green = &green;
cmap.blue = &blue;
cmap.transp = NULL;
for (i = 0; i < count; i++) {
int err;
if (get_user(red8, &ured[i]) ||
get_user(green8, &ugreen[i]) ||
get_user(blue8, &ublue[i]))
return -EFAULT;
red = red8 << 8;
green = green8 << 8;
blue = blue8 << 8;
cmap.start = index + i;
err = fb_set_cmap(&cmap, info);
if (err)
return err;
}
return 0;
}
case FBIOGETCMAP_SPARC: {
struct fbcmap __user *c = (struct fbcmap __user *) arg;
unsigned char __user *ured;
unsigned char __user *ugreen;
unsigned char __user *ublue;
struct fb_cmap *cmap = &info->cmap;
unsigned int index, count, i;
u8 red, green, blue;
if (get_user(index, &c->index) ||
get_user(count, &c->count) ||
get_user(ured, &c->red) ||
get_user(ugreen, &c->green) ||
get_user(ublue, &c->blue))
return -EFAULT;
if (index > cmap->len || count > cmap->len - index)
return -EINVAL;
for (i = 0; i < count; i++) {
red = cmap->red[index + i] >> 8;
green = cmap->green[index + i] >> 8;
blue = cmap->blue[index + i] >> 8;
if (put_user(red, &ured[i]) ||
put_user(green, &ugreen[i]) ||
put_user(blue, &ublue[i]))
return -EFAULT;
}
return 0;
}
default:
return -EINVAL;
}
}
EXPORT_SYMBOL(sbusfb_ioctl_helper);
#ifdef CONFIG_COMPAT
int sbusfb_compat_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
case FBIOGTYPE:
case FBIOSATTR:
case FBIOGATTR:
case FBIOSVIDEO:
case FBIOGVIDEO:
case FBIOSCURSOR32:
case FBIOGCURSOR32: /* This is not implemented yet.
Later it should be converted... */
case FBIOSCURPOS:
case FBIOGCURPOS:
case FBIOGCURMAX:
return info->fbops->fb_ioctl(info, cmd, arg);
case FBIOPUTCMAP32:
case FBIOPUTCMAP_SPARC: {
struct fbcmap32 c;
struct fb_cmap cmap;
u16 red, green, blue;
u8 red8, green8, blue8;
unsigned char __user *ured;
unsigned char __user *ugreen;
unsigned char __user *ublue;
unsigned int i;
if (copy_from_user(&c, compat_ptr(arg), sizeof(c)))
return -EFAULT;
ured = compat_ptr(c.red);
ugreen = compat_ptr(c.green);
ublue = compat_ptr(c.blue);
cmap.len = 1;
cmap.red = &red;
cmap.green = &green;
cmap.blue = &blue;
cmap.transp = NULL;
for (i = 0; i < c.count; i++) {
int err;
if (get_user(red8, &ured[i]) ||
get_user(green8, &ugreen[i]) ||
get_user(blue8, &ublue[i]))
return -EFAULT;
red = red8 << 8;
green = green8 << 8;
blue = blue8 << 8;
cmap.start = c.index + i;
err = fb_set_cmap(&cmap, info);
if (err)
return err;
}
return 0;
}
case FBIOGETCMAP32: {
struct fbcmap32 c;
unsigned char __user *ured;
unsigned char __user *ugreen;
unsigned char __user *ublue;
struct fb_cmap *cmap = &info->cmap;
unsigned int index, i;
u8 red, green, blue;
if (copy_from_user(&c, compat_ptr(arg), sizeof(c)))
return -EFAULT;
index = c.index;
ured = compat_ptr(c.red);
ugreen = compat_ptr(c.green);
ublue = compat_ptr(c.blue);
if (index > cmap->len || c.count > cmap->len - index)
return -EINVAL;
for (i = 0; i < c.count; i++) {
red = cmap->red[index + i] >> 8;
green = cmap->green[index + i] >> 8;
blue = cmap->blue[index + i] >> 8;
if (put_user(red, &ured[i]) ||
put_user(green, &ugreen[i]) ||
put_user(blue, &ublue[i]))
return -EFAULT;
}
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
EXPORT_SYMBOL(sbusfb_compat_ioctl);
#endif
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