From: "Christian König" <ckoenig.leichtzumerken@gmail.com>
To: christian.koenig@amd.com, amd-gfx@lists.freedesktop.org,
Darren Salt <devspam@moreofthesa.me.uk>
Subject: Re: [PATCH 3/7] amdgpu: resize BAR0 to the maximum available size, even if it doesn't cover VRAM (v2)
Date: Mon, 14 Dec 2020 09:12:06 +0100 [thread overview]
Message-ID: <1d482d3c-ef99-ffdf-84c6-61182fd0f757@gmail.com> (raw)
In-Reply-To: <58E2B73AC8%devspam@moreofthesa.me.uk>
Am 11.12.20 um 18:31 schrieb Darren Salt:
> [SNIP]
>> If that isn't the case use fls() to get the highest set bit < 13.
> That suggests that it'll be easiest to clear each bit after the corresponding
> size is checked, I think.
Ok, well you don't seem to understand my constrain here: Never check
more than one size!
Find the first valid size which is good for you and then try to resize
to that one, if this doesn't work abort.
> Also, this looks like it's adding complexity to
> try to make rarely-executed code slightly faster in some cases (I can't see
> it helping where available_sizes == 0x3F00, for example).
The intention here is not to make the code faster, but to prevent issues
on system where we probe multiple GPUs at once.
Regards,
Christian.
> Incidentally, is it worth trying to reduce the BAR size at all? Thinking
> mainly of two situations – limiting the maximum size, and the BIOS having
> allocated one much too large.
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> amd-gfx mailing list
> amd-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
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next prev parent reply other threads:[~2020-12-14 8:12 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-11 0:54 [PATCH 0/7] amdgpu, pci: improved BAR resizing support Darren Salt
2020-12-11 0:55 ` [PATCH 1/7] pci: export PCI BAR size-reading functions Darren Salt
2020-12-11 9:07 ` Christian König
2020-12-11 0:55 ` [PATCH 2/7] pci: add BAR bytes->size helper & expose size->bytes helper Darren Salt
2020-12-11 0:55 ` [PATCH 3/7] amdgpu: resize BAR0 to the maximum available size, even if it doesn't cover VRAM (v2) Darren Salt
2020-12-11 16:42 ` Christian König
2020-12-11 17:31 ` Darren Salt
2020-12-11 19:06 ` Alex Deucher
2020-12-14 8:12 ` Christian König [this message]
2020-12-14 15:46 ` Darren Salt
2020-12-14 20:44 ` Christian König
2020-12-11 0:55 ` [PATCH 4/7] amdgpu: module option controlling whether BAR0 resizing is done Darren Salt
2020-12-11 9:09 ` Christian König
2020-12-11 0:55 ` [PATCH 5/7] amdgpu: limit maximum FB BAR size when attempting to enlarge Darren Salt
2020-12-11 0:55 ` [PATCH 6/7] pci: allow for overriding the list of advertised BAR sizes Darren Salt
2020-12-11 0:55 ` [PATCH 7/7] amdgpu: allow overriding of the GPU's list of supported " Darren Salt
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