So, I upgrade to 2.4.0 and it's cool, except that I can't do
anything neat with my voodoo3 anymore. I've been looking
for a solution for weeks but to no avail. 3dfx's web site
looks like it's gone and nothing on lk about it.
[ By all means, if someone has fixed this, do let me know ]
Tracing the Glide test programs shows that ioctl() is returning
-EPERM. Compiling the driver with 'make debug' shows:
[ To aid in the confusion, my machine's hostname is 'mmap' ]
[ insmod 3dfx.o ]
Feb 14 15:08:14 mmap kernel: 3dfx: Entering init_module()
Feb 14 15:08:14 mmap kernel: 3dfx: Successfully registered device 3dfx
Feb 14 15:08:14 mmap kernel: 3dfx: board vendor 4634 type 5 located at de000000/
[ ./test3Dfx ]
Feb 14 15:08:29 mmap kernel: 3dfx: Entering mmap_3dfx
Feb 14 15:08:29 mmap kernel: 3dfx: Couldn't match address 0 to a card
Feb 14 15:08:29 mmap kernel: 3dfx: Entering release_3dfx
mmap_3dfx is being called before ioctl_3dfx is ever reached. Looking
to make heads of the "Couldn't match address 0 to a card" message, I
stuck in some more debugging output:
[ VM_OFFSET is #define VM_OFFSET(vma) (vma->vm_pgoff << PAGE_SHIFT) ]
Feb 14 15:08:29 mmap kernel: 3dfx: Entering mmap_3dfx
Feb 14 15:08:29 mmap kernel: 3dfx: Entering decode_vma:
Feb 14 15:08:29 mmap kernel: 3dfx: start = c1270640, end = c5e40840
Feb 14 15:08:29 mmap kernel: 3dfx: offset = 0 (VM_OFFSET = 0)
Feb 14 15:08:29 mmap kernel: 3dfx: Leaving decode_vma
Feb 14 15:08:29 mmap kernel: 3dfx: compare de000000 or e2000000 to 0
Feb 14 15:08:29 mmap kernel: 3dfx: Couldn't match address 0 to a card
Feb 14 15:08:29 mmap kernel: 3dfx: Entering release_3dfx
Sure stumped me. By my guess, it seems that mmap_3dfx is provided by
the char driver so that a userland process can map a region of (video?)
memory on the card.
The process calls ioctl() after opening /dev/3dfx. That ioctl() triggers
an mmap() call, the driver gets addresses it's totally not expecting,
and it returns -EPERM.
Why does mmap get called first?? Am I reading this right?
--
Michael Bacarella <[email protected]>
Technical Staff / System Development,
New York Connect.Net, Ltd.
Michael Bacarella wrote:
> So, I upgrade to 2.4.0 and it's cool, except that I can't do
> anything neat with my voodoo3 anymore. I've been looking
> for a solution for weeks but to no avail. 3dfx's web site
> looks like it's gone and nothing on lk about it.
>
> The process calls ioctl() after opening /dev/3dfx. That ioctl() triggers
> an mmap() call, the driver gets addresses it's totally not expecting,
> and it returns -EPERM.
struct file_operations has changed in 2.4.0. The following patch for 3dfx
module fixes the structure initialization and makes it work just fine.
--- 3dfx_driver.c Sun Apr 9 03:44:10 2000
+++ 3dfx_driver.c Fri Feb 23 22:42:06 2001
@@ -707,25 +707,10 @@
#endif /* HAVE_MTRR */
static struct file_operations fops_3dfx = {
- NULL, /* llseek (2.1) / lseek (2.0) */
- NULL, /* read */
- NULL, /* write */
- NULL, /* readdir */
- NULL, /* poll (2.1) / select (2.0) */
- ioctl_3dfx, /* ioctl */
- mmap_3dfx, /* mmap */
- open_3dfx, /* open */
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 1, 118)
- NULL, /* flush (2.1.118+) */
-#endif
- release_3dfx, /* release */
- NULL, /* fsync */
- NULL, /* fasync */
- NULL, /* check_media_change */
- NULL, /* revalidate */
-#ifdef KERNEL_VER_2_1
- NULL /* lock (2.1) */
-#endif
+ ioctl: ioctl_3dfx,
+ mmap: mmap_3dfx,
+ open: open_3dfx,
+ release: release_3dfx
};
#ifdef MODULE