Re: Usage of readb() and friends...

Re: Usage of readb() and friends...

[Geert Uytterhoeven]

On Tue, 2 Mar 2004, Kars de Jong wrote:
> Which reminds me: drivers/video/fbmem.c at least seems to treat the
> return value of ioremap() as a virtual address, since it calls
> copy_{to,from}_user on it directly...

You're right. And the trouble there is that you can't easily find out which
ioremap() variant was used...

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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Re: Re: Usage of readb() and friends...

[James Simmons]

Hopefully one fb_write and fb_read in fbmem.c moves over to using 
accelerated blits this can go away.


On Tue, 2 Mar 2004, Geert Uytterhoeven wrote:

> On Tue, 2 Mar 2004, Kars de Jong wrote:
> > Which reminds me: drivers/video/fbmem.c at least seems to treat the
> > return value of ioremap() as a virtual address, since it calls
> > copy_{to,from}_user on it directly...
> 
> You're right. And the trouble there is that you can't easily find out which
> ioremap() variant was used...
> 
> Gr{oetje,eeting}s,
> 
> 						Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> 							    -- Linus Torvalds
> 
> 
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> _______________________________________________
> Linux-fbdev-devel mailing list
> Linux-fbdev-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-fbdev-devel
> 



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Re: Re: Usage of readb() and friends...

[Benjamin Herrenschmidt]

On Tue, 2004-03-02 at 23:15, Geert Uytterhoeven wrote:
> On Tue, 2 Mar 2004, Kars de Jong wrote:
> > Which reminds me: drivers/video/fbmem.c at least seems to treat the
> > return value of ioremap() as a virtual address, since it calls
> > copy_{to,from}_user on it directly...
> 
> You're right. And the trouble there is that you can't easily find out which
> ioremap() variant was used...

And... it's illegal to call copy_to/from_user on the return of
ioremap anyway. Not only for semantic reasons, but also for practical
reasons, for example, ioremap returns non cacheable space on PPC,
and copy_to/from_user uses "cache hints" to speed up the copy.

Ben.




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Re: Re: Usage of readb() and friends...

[James Simmons]

> > On Tue, 2 Mar 2004, Kars de Jong wrote:
> > > Which reminds me: drivers/video/fbmem.c at least seems to treat the
> > > return value of ioremap() as a virtual address, since it calls
> > > copy_{to,from}_user on it directly...
> > 
> > You're right. And the trouble there is that you can't easily find out which
> > ioremap() variant was used...
> 
> And... it's illegal to call copy_to/from_user on the return of
> ioremap anyway. Not only for semantic reasons, but also for practical
> reasons, for example, ioremap returns non cacheable space on PPC,
> and copy_to/from_user uses "cache hints" to speed up the copy.

Ug. More reason to replace the code with imageblit calls. The new fb_write 
code for some reson tho scrambles the console screen and then scrolls the 
screen below where I'm writing. I haven't figured out way yet.




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Re: Re: Usage of readb() and friends...

[Benjamin Herrenschmidt]

>  the code with imageblit calls. The new fb_write 
> code for some reson tho scrambles the console screen and then scrolls the 
> screen below where I'm writing. I haven't figured out way yet.

BTW. Have had a chance to look into those memory corruption issues
I told you about ? I've been rather busy lately...

Ben.





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Re: [Linux-fbdev-devel] Re: Usage of readb() and friends...

[James Simmons]

No. I lost my SCSI driver. So I lost my main machine. I need a new driver 
but don't have the money to buy a drive right now. Maybe someone would be 
kind to donate me a Ultra Wide SCSI 2 drive.

On Wed, 3 Mar 2004, Benjamin Herrenschmidt wrote:

> >  the code with imageblit calls. The new fb_write 
> > code for some reson tho scrambles the console screen and then scrolls the 
> > screen below where I'm writing. I haven't figured out way yet.
> 
> BTW. Have had a chance to look into those memory corruption issues
> I told you about ? I've been rather busy lately...
> 
> Ben.
> 
> 
> 
> 

Re: Re: Usage of readb() and friends...

[Richard Smith]

James Simmons wrote:

> No. I lost my SCSI driver. So I lost my main machine. I need a new driver 
> but don't have the money to buy a drive right now. Maybe someone would be 
> kind to donate me a Ultra Wide SCSI 2 drive.
> 
> On Wed, 3 Mar 2004, Benjamin Herrenschmidt wrote:
> 

Sorry for sending this via the list but I still have not fixed our 
mailserver to be able to send mail to james directly.

James:

1) How big of a drive to you have to have?  I've got some 4 gigers I can 
donate.

2) Do you have any way to use SCA drives?

-- 
Richard A. Smith
rsmith@bitworks.com




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Re: Re: Usage of readb() and friends...

[James Simmons]

> Sorry for sending this via the list but I still have not fixed our 
> mailserver to be able to send mail to james directly.
> 
> James:
> 
> 1) How big of a drive to you have to have?  I've got some 4 gigers I can 
> donate.

The driver that died was 9 Gigs. 
 
> 2) Do you have any way to use SCA drives?

Its a older (4 years old) machine with built in Ultra Wide 2 scsi support. 
Its 68 pin. I believe my mother board supports 80 pin as well. I have to 
look.




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Re: Re: Usage of readb() and friends...

[Richard Smith]

James Simmons wrote:

>>
>>1) How big of a drive to you have to have?  I've got some 4 gigers I can 
>>donate.
> 
> The driver that died was 9 Gigs. 

Ok. But do you _have_ to have that much.  Will 4 get you going? Or if 
you can do multiple drives I have a few you could raid them or lvm them 
into a big drive.

>>2) Do you have any way to use SCA drives?
> 
> Its a older (4 years old) machine with built in Ultra Wide 2 scsi support. 
> Its 68 pin. I believe my mother board supports 80 pin as well. I have to 
> look.

Unless you have a RAID backplane in your setup I doubt you motherboard 
does SCA (80-pin) devices.  Nice if so then nice motherboard.

-- 
Richard A. Smith
rsmith@bitworks.com




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Re: Re: Usage of readb() and friends...

[James Simmons]

> > The driver that died was 9 Gigs. 
> 
> Ok. But do you _have_ to have that much.  Will 4 get you going? Or if 
> you can do multiple drives I have a few you could raid them or lvm them 
> into a big drive.

No problem. Th reason for such a big drive before was it was a SuSE 
distro. like most distors they throw everything including the kitchen sink 
at you. I was use a debian system which I would strip down. I have no 
problem doing mulitple drives. LVM is really cool :-)


> >>2) Do you have any way to use SCA drives?
> > 
> > Its a older (4 years old) machine with built in Ultra Wide 2 scsi support. 
> > Its 68 pin. I believe my mother board supports 80 pin as well. I have to 
> > look.
> 
> Unless you have a RAID backplane in your setup I doubt you motherboard 
> does SCA (80-pin) devices.  Nice if so then nice motherboard.

I don't think so then.



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Re: Re: Usage of readb() and friends...

[Richard Smith]

James Simmons wrote:

>>>The driver that died was 9 Gigs. 
>>
>>Ok. But do you _have_ to have that much.  Will 4 get you going? Or if 
>>you can do multiple drives I have a few you could raid them or lvm them 
>>into a big drive.
> 
> No problem. Th reason for such a big drive before was it was a SuSE 
> distro. like most distors they throw everything including the kitchen sink 
> at you. I was use a debian system which I would strip down. I have no 
> problem doing mulitple drives. LVM is really cool :-)
> 

Ok. Then I have 3 4Gib drives you can turn into a 12Gib setup.  if you 
can work out the SCA issue.  They are SCA drives.

>>Unless you have a RAID backplane in your setup I doubt you motherboard 
>>does SCA (80-pin) devices.  Nice if so then nice motherboard.

> I don't think so then.

The 80-pin connector for SCA has both Power and scsi ID all in one which 
is why its used for RAID backplanes.  They make SCA to 50 and 68 pin 
adapters that have std pc power jacks on them.  You will still need a 
terminator though probally.

Have you looked on e-bay?  9Gib 68 pin drives are closeing for <= $20 
18Gib for < $30.  Which is less than what 3 SCA to 68 pin converters is 
going to cost.

I have $20 I'll donate for you to buy a new drive.  Got a pay-pal or 
someother internet money account?

-- 
Richard A. Smith
rsmith@bitworks.com




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