[haiku-development] Re: radeon_hd driver help request
- From: Alexander von Gluck IV <kallisti5@xxxxxxxxxxx>
- To: <haiku-development@xxxxxxxxxxxxx>
- Date: Mon, 03 Dec 2012 09:44:35 -0600
On 2012-12-03 5:38 am, Alexander von Gluck IV wrote:
On 2012-12-02 7:48 pm, looncraz wrote:
On 12/2/2012 4:22 PM, Gerald Zajac wrote:
On 12/02/2012 02:08 PM, looncraz wrote:
I'm going to allocate a
chunk at the end of the frame buffer, and reduce the reported
available
graphics RAM.
That's what I did with the video drivers that I wrote (s3, ati,
3dfx). I used a chunk of memory at either the beginning or end of the
video memory, and adjusted the frame buffer accordingly.
Regards,
Gerald
Good to know I'm not alone ;-)
I'm somehow drawing the cursor into the wrong memory, though... oh
well, I probably passed the wrong relative memory location... not
killing anything though ;-)
.
.
As for where to allocate the cursor memory... i'm not 100% sure about
that
off the top of my head. I could find out from AMD but it may take a
few days.
... or a few hours.
"
The bitmap cursor needs to be placed into vram.
For more information see drivers/gpu/drm/radeon/radeon_cursor.c in the
kernel.
"
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=drivers/gpu/drm/radeon/radeon_cursor.c#l174
drm_gem_object_lookup loads the cursor bitmap into a 'drm_gem_object'
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=drivers/gpu/drm/radeon/radeon_cursor.c#l184
radeon_bo_pin_restricted reserves some GPU memory and returns the
reserved address in gpu_addr.
radeon_set_cursor then tells the card where the cursor is located at in
memory.
the drm_gem_object_lookup and radeon_bo_pin_restricted functionality
doesn't exist yet in the driver / accelerant.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=drivers/gpu/drm/radeon/radeon_object.c
We really don't do any kind of special fencing of video memory yet...
for now i'd say just stick the cursor at the end of the PCI BAR? (minus
the size of the cursor)
http://cgit.haiku-os.org/haiku/tree/src/add-ons/kernel/drivers/graphics/radeon_hd/radeon_hd.cpp#n644
All uncharted territory thus far.. this is actually a little more
difficult in practice then theory :)
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- » [haiku-development] Re: radeon_hd driver help request - Alexander von Gluck IV
