Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Documentation/gpu: Expand generic block information
This commit expands the overall explanation about AMD GPU IPs by adding
more details about their interconnection. Note that this commit includes
a diagram that provides additional information.
v2: fix up TMR - Trusted Memory Region
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Rodrigo Siqueira <siqueira@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
authored by
Rodrigo Siqueira
and committed by
Alex Deucher
d68ba530
e0f90f18
+727
-3
+687
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+9
Documentation/gpu/amdgpu/amdgpu-glossary.rst
+9
Documentation/gpu/amdgpu/amdgpu-glossary.rst
···
240
240
stages had different cache designs; it refers to the L1 cache in older
241
241
architectures.
242
242
243
+
TMR
244
+
Trusted Memory Region
245
+
246
+
TMZ
247
+
Trusted Memory Zone
248
+
243
249
TOC
244
250
Table of Contents
251
+
252
+
UMC
253
+
Unified Memory Controller
245
254
246
255
UMSCH
247
256
User Mode Scheduler
-3
Documentation/gpu/amdgpu/display/dc-glossary.rst
-3
Documentation/gpu/amdgpu/display/dc-glossary.rst
+31
Documentation/gpu/amdgpu/driver-core.rst
+31
Documentation/gpu/amdgpu/driver-core.rst
···
77
77
decode. It's exposed to userspace for user mode drivers (VA-API,
78
78
OpenMAX, etc.)
79
79
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+
It is important to note that these blocks can interact with each other. The
81
+
picture below illustrates some of the components and their interconnection:
82
+
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+
.. kernel-figure:: amd_overview_block.svg
84
+
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+
In the diagram, memory-related blocks are shown in green. Notice that specific
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IPs have a green square that represents a small hardware block named 'hub',
87
+
which is responsible for interfacing with memory. All memory hubs are connected
88
+
in the UMCs, which in turn are connected to memory blocks. As a note,
89
+
pre-vega devices have a dedicated block for the Graphic Memory Controller
90
+
(GMC), which was replaced by UMC and hubs in new architectures. In the driver
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code, you can identify this component by looking for the suffix hub, for
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+
example: gfxhub, dchub, mmhub, vmhub, etc. Keep in mind that the component's
93
+
interaction with the memory block may vary across architectures. For example,
94
+
on Navi and newer, GC and SDMA are both attached to GCHUB; on pre-Navi, SDMA
95
+
goes through MMHUB; VCN, JPEG, and VPE go through MMHUB; DCN goes through
96
+
DCHUB.
97
+
98
+
There is some protection for certain memory elements, and the PSP plays an
99
+
essential role in this area. When a specific firmware is loaded into memory,
100
+
the PSP takes steps to ensure it has a valid signature. It also stores firmware
101
+
images in a protected memory area named Trusted Memory Area (TMR), so the OS or
102
+
driver can't corrupt them at runtime. Another use of PSP is to support Trusted
103
+
Applications (TA), which are basically small applications that run on the
104
+
trusted processor and handles a trusted operation (e.g., HDCP). PSP is also
105
+
used for encrypted memory for content protection via Trusted Memory Zone (TMZ).
106
+
107
+
Another critical IP is the SMU. It handles reset distribution, as well as
108
+
clock, thermal, and power management for all IPs on the SoC. SMU also helps to
109
+
balance performance and power consumption.
110
+
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.. _pipes-and-queues-description:
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GFX, Compute, and SDMA Overall Behavior