17.09.2013, в 18:24, Alex Deucher <alexdeucher@xxxxxxxxx> написал(а):
> On Tue, Sep 17, 2013 at 5:23 AM, Alex Ivanov <gnidorah@xxxxxxxxx> wrote:
>> Alex,
>>
>> 10.09.2013, в 16:37, Alex Deucher <alexdeucher@xxxxxxxxx> написал(а):
>>
>>> The dummy page isn't really going to help much. That page is just
>>> used as a safety placeholder for gart entries that aren't mapped on
>>> the GPU. TTM (drivers/gpu/drm/ttm) actually does the allocation of
>>> the backing pages for the gart.
>>
>>> You may want to look there.
>>
>> Ah, sorry. Indeed. Though, my idea with:
>>
>> On Tue, Sep 10, 2013 at 5:20 AM, Alex Ivanov <gnidorah@xxxxxxxxx> wrote:
>>
>>> Thanks! I'll try. Meanwhile i've tried a switch from page_alloc() to
>>> dma_alloc_coherent() in radeon_dummy_page_*(), which didn't help :(
>>
>> doesn't make a sense at TTM part as well.
>
> After the driver is loaded, you can dump some info from debugfs:
> r100_rbbm_info
> r100_cp_ring_info
> r100_cp_csq_fifo
> Which will dump a bunch of registers and internal fifos so we can see
> that the chip actually processed.
>
> Alex
Reading of r100_cp_ring_info leads to a KP:
r100_debugfs_cp_ring_info():
count = (rdp + ring->ring_size - wdp) & ring->ptr_mask;
i = (rdp + j) & ring->ptr_mask;
for (j = 0; j <= count; j++) {
i = (rdp + j) & ring->ptr_mask;
--> Here at first iteration <--
--> count = 262080, i = 0 <--
seq_printf(m, "r[%04d]=0x%08x\n", i, ring->ring[i]);
}
Reading of radeon_ring_gfx (which i've additionally tried to read)
throws an MCE:
radeon_debugfs_ring_info():
count = (ring->ring_size / 4) - ring->ring_free_dw;
i = (ring->rptr + ring->ptr_mask + 1 - 32) & ring->ptr_mask;
for (j = 0; j <= (count + 32); j++) {
--> Here at first iteration <--
--> i = 262112, j = 0 <--
seq_printf(m, "r[%5d]=0x%08x\n", i, ring->ring[i]);
i = (i + 1) & ring->ptr_mask;
}
I'm attaching debug outputs on kernel built with these loops commented.
Attachment:
drm_parisc_debug.tgz
Description: Binary data
_______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
