<div dir="auto">First off, ignore the whole 48-bit heap thing. It exists to work around some weird issues with our vertex fetch hardware. We're going to be deleting it and switching to using a different workaround (more tracking and flushing) in the near future.<div dir="auto"><br></div><div dir="auto">As far as heap sizes go, copying ANV is probably not a bad idea since it's also a UMA. We claim half of your RAM if the system has <= 4GB and 3/4 if your system has > 4GB. It's not perfect but it's been working well for 4 years now. We also have code in there (which you're free to steal) for figuring out your available system and reporting that back to the app.</div><div dir="auto"><br></div><div dir="auto">--Jason</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Oct 26, 2019, 16:23 <<a href="mailto:abergmeier@gmx.net">abergmeier@gmx.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-family:Verdana;font-size:12.0px"><div>On my impossible quest to try to implement a Vulkan driver for RPi4, I now need to implement memory information (mostly heap and types).</div>
<div>As always I shadowed what anv is doing but have no access to RPi documentation. What is the best approach to get necessary information for question like:</div>
<div>1. Need 48+bit addresses supported (would assume no since the max. memory config is 4GB)? </div>
<div>2. What can be exposed as the heap start/end/size?</div>
<div>3. Which types of memory can one support (would assume VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT | VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT and VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT | VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_CACHED_BIT)?</div>
<div> </div>
<div>I will have another look at v3d (drm) sources. Is there something to be found in v3d (gallium)?</div>
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