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<section id="amdgpu-xgmi-support">
<h1>AMDGPU XGMI Support<a class="headerlink" href="#amdgpu-xgmi-support" title="Link to this heading">¶</a></h1>
<p id="id1"><strong>AMDGPU XGMI Support</strong></p>
<p>XGMI is a high speed interconnect that joins multiple GPU cards
into a homogeneous memory space that is organized by a collective
hive ID and individual node IDs, both of which are 64-bit numbers.</p>
<p>The file xgmi_device_id contains the unique per GPU device ID and
is stored in the /sys/class/drm/card${cardno}/device/ directory.</p>
<p>Inside the device directory a sub-directory ‘xgmi_hive_info’ is
created which contains the hive ID and the list of nodes.</p>
<dl class="simple">
<dt>The hive ID is stored in:</dt><dd><p>/sys/class/drm/card${cardno}/device/xgmi_hive_info/xgmi_hive_id</p>
</dd>
<dt>The node information is stored in numbered directories:</dt><dd><p>/sys/class/drm/card${cardno}/device/xgmi_hive_info/node${nodeno}/xgmi_device_id</p>
</dd>
</dl>
<p>Each device has their own xgmi_hive_info direction with a mirror
set of node sub-directories.</p>
<p>The XGMI memory space is built by contiguously adding the power of
two padded VRAM space from each node to each other.</p>
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