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Subject[PATCH 2.4.29-pre1] radeonfb: don't try to ioreamp the entire VRAM [was: Re: [Linux-fbdev-devel] why does radeonfb work fine in 2.6, but not in 2.4.29-pre1?]
Il Sun, Nov 28, 2004 at 07:46:06PM +0100, Jurriaan ha scritto: 
> The same radeonfb-setup works fine in every 2.6 kernel I can remember
> (last tested with 2.6.10-rc2-mm3) but give the dreaded 'cannot map FB'
> in 2.4.29-pre1.
>
> The card has 128 MB of ram, and my system has 3 GB of RAM.
>
> Is there any reason the ioremap() call works on 2.6, but doesn't on 2.4?
>
> I've tried searching google for hints, but nothing has turned up.
>
> Is there any way to test 2.4 with my radeonfb and all of my memory?

Hi Marcelo,
I sent you a patch a while ago but was discarded because introduced a
subtle API change. This time should be ok :)

Make fb layer aware of the difference between the ioremap()'ed VRAM and
total available VRAM.
smem_len in struct fb_fix_screeninfo still contains the amount of
physical VRAM (reported to userspace via FBIOGET_FSCREENINFO ioctl) and
the new field mapped_vram contains the amount of VRAM actually
ioremap()'ed by drivers (used in read/write/mmap operations).
Since there was unused padding at the end of struct fb_fix_screeninfo
binary compatibility with userspace utilities is retained.
If mapped_vram is not set it's assumed that the entire framebuffer is
mapped, thus other drivers are unaffected by this patch.

The patch has been tested by Jurriaan <thunder7@xs4all.nl>.

Signed-off-by: Luca Tettamanti <kronos@people.it>

--- a/include/linux/fb.h 2004-11-30 18:30:08.000000000 +0100
+++ b/include/linux/fb.h 2004-11-30 18:33:00.000000000 +0100
@@ -126,7 +126,8 @@
/* (physical address) */
__u32 mmio_len; /* Length of Memory Mapped I/O */
__u32 accel; /* Type of acceleration available */
- __u16 reserved[3]; /* Reserved for future compatibility */
+ __u32 mapped_vram; /* Amount of ioremap()'ed VRAM */
+ __u16 reserved[1]; /* Reserved for future compatibility */
};

/* Interpretation of offset for color fields: All offsets are from the right,
--- a/drivers/video/fbmem.c 2004-11-30 18:30:00.000000000 +0100
+++ b/drivers/video/fbmem.c 2004-11-30 18:43:06.000000000 +0100
@@ -410,6 +410,7 @@
struct fb_info *info = registered_fb[fbidx];
struct fb_ops *fb = info->fbops;
struct fb_fix_screeninfo fix;
+ unsigned int size;

if (! fb || ! info->disp)
return -ENODEV;
@@ -418,10 +419,12 @@
return -EINVAL;

fb->fb_get_fix(&fix,PROC_CONSOLE(info), info);
- if (p >= fix.smem_len)
+ size = fix.mapped_vram ? fix.mapped_vram : fix.smem_len;
+
+ if (p >= size)
return 0;
- if (count > fix.smem_len - p)
- count = fix.smem_len - p;
+ if (count > size - p)
+ count = size - p;
if (count) {
char *base_addr;

@@ -444,6 +447,7 @@
struct fb_ops *fb = info->fbops;
struct fb_fix_screeninfo fix;
int err;
+ unsigned int size;

if (! fb || ! info->disp)
return -ENODEV;
@@ -452,11 +456,13 @@
return -EINVAL;

fb->fb_get_fix(&fix, PROC_CONSOLE(info), info);
- if (p > fix.smem_len)
+ size = fix.mapped_vram ? fix.mapped_vram : fix.smem_len;
+
+ if (p > size)
return -ENOSPC;
err = 0;
- if (count > fix.smem_len - p) {
- count = fix.smem_len - p;
+ if (count > size - p) {
+ count = size - p;
err = -ENOSPC;
}
if (count) {
@@ -619,7 +625,10 @@

/* frame buffer memory */
start = fix.smem_start;
- len = PAGE_ALIGN((start & ~PAGE_MASK)+fix.smem_len);
+ if (fix.mapped_vram)
+ len = PAGE_ALIGN((start & ~PAGE_MASK) + fix.mapped_vram);
+ else
+ len = PAGE_ALIGN((start & ~PAGE_MASK) + fix.smem_len);
if (off >= len) {
/* memory mapped io */
off -= len;
--- a/drivers/video/radeonfb.c 2004-11-30 18:06:45.000000000 +0100
+++ b/drivers/video/radeonfb.c 2004-11-30 18:50:25.000000000 +0100
@@ -176,7 +176,8 @@
#define RTRACE if(0) printk
#endif

-
+#define MAX_MAPPED_VRAM (2048*2048*4)
+#define MIN_MAPPED_VRAM (1024*768*1)

enum radeon_chips {
RADEON_QD,
@@ -499,7 +500,8 @@

short chipset;
unsigned char arch;
- int video_ram;
+ unsigned int video_ram;
+ unsigned int mapped_vram;
u8 rev;
int pitch, bpp, depth;
int xres, yres, pixclock;
@@ -1824,8 +1826,16 @@
}
}

- rinfo->fb_base = (unsigned long) ioremap (rinfo->fb_base_phys,
- rinfo->video_ram);
+ rinfo->mapped_vram = min_t(unsigned int, MAX_MAPPED_VRAM, rinfo->video_ram);
+ do {
+ rinfo->fb_base = (unsigned long) ioremap (rinfo->fb_base_phys,
+ rinfo->mapped_vram);
+ if (rinfo->fb_base)
+ break;
+
+ rinfo->mapped_vram /= 2;
+ } while(rinfo->mapped_vram > MIN_MAPPED_VRAM);
+
if (!rinfo->fb_base) {
printk ("radeonfb: cannot map FB\n");
iounmap ((void*)rinfo->mmio_base);
@@ -1836,6 +1846,7 @@
kfree (rinfo);
return -ENODEV;
}
+ RTRACE(KERN_INFO "radeonfb: mapped %dk videoram\n", rinfo->mapped_vram/1024);

/* currcon not yet configured, will be set by first switch */
rinfo->currcon = -1;
@@ -2205,7 +2216,7 @@
printk("radeonfb: using max available virtual resolution\n");
for (i=0; modes[i].xres != -1; i++) {
if (modes[i].xres * nom / den * modes[i].yres <
- rinfo->video_ram / 2)
+ rinfo->mapped_vram / 2)
break;
}
if (modes[i].xres == -1) {
@@ -2218,15 +2229,15 @@
printk("radeonfb: virtual resolution set to max of %dx%d\n",
v->xres_virtual, v->yres_virtual);
} else if (v->xres_virtual == -1) {
- v->xres_virtual = (rinfo->video_ram * den /
+ v->xres_virtual = (rinfo->mapped_vram * den /
(nom * v->yres_virtual * 2)) & ~15;
} else if (v->yres_virtual == -1) {
v->xres_virtual = (v->xres_virtual + 15) & ~15;
- v->yres_virtual = rinfo->video_ram * den /
+ v->yres_virtual = rinfo->mapped_vram * den /
(nom * v->xres_virtual *2);
} else {
if (v->xres_virtual * nom / den * v->yres_virtual >
- rinfo->video_ram) {
+ rinfo->mapped_vram) {
return -EINVAL;
}
}
@@ -2263,6 +2274,7 @@

fix->smem_start = rinfo->fb_base_phys;
fix->smem_len = rinfo->video_ram;
+ fix->mapped_vram = rinfo->mapped_vram;

fix->type = disp->type;
fix->type_aux = disp->type_aux;
@@ -2430,6 +2442,9 @@
return -EINVAL;
}

+ if (((v.xres_virtual * v.yres_virtual * nom) / den) > rinfo->mapped_vram)
+ return -EINVAL;
+
if (radeonfb_do_maximize(rinfo, var, &v, nom, den) < 0)
return -EINVAL;


Luca
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