linux-kernel - [PATCH v3 0/5] drm/amdgpu: add UMA carveout tuning interfaces

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Message-ID: <20251126-vram-carveout-tuning-for-upstream-v3-0-cf1729c4cb3c@amd.com>
Date: Wed, 26 Nov 2025 17:05:11 +0800
From: "Yo-Jung Leo Lin (AMD)" <Leo.Lin@....com>
To: Alex Deucher <alexander.deucher@....com>, Christian König
	<christian.koenig@....com>, David Airlie <airlied@...il.com>, Simona Vetter
	<simona@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
	Jonathan Corbet <corbet@....net>
CC: <amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>, "Tsao, Anson"
	<anson.tsao@....com>, "Mario Limonciello (AMD) (kernel.org)"
	<superm1@...nel.org>, "Yo-Jung Leo Lin (AMD)" <Leo.Lin@....com>
Subject: [PATCH v3 0/5] drm/amdgpu: add UMA carveout tuning interfaces

The integrated info v2.3 table in the Atom ROM exposes available
options for the VRAM carveout sizes. The carveout size can be changed
using the ATCS function code 0xA for BIOS that supports this.

Make these features available as sysfs files, so that users can set
the carveout size in a way similar to what a Windows user can do in
the "Tuning" tab in the AMD Adrenalin. The newly added sysfs files
are:

- uma_carveout_options: this a read-only file listing all available
  carveout options. They are fetched from the Atom ROM on driver
  initialization.

- uma_carveout: this shows the index of the currently selected option,
  as shown in the uma_carveout_options. Writing a valid option index
  to this file will change the carveout option on next boot.

Note that above files are created only if BIOS indicates support for
it, i.e. where the table shows non-zero UMACarveoutIndexMax.

Signed-off-by: Yo-Jung Leo Lin (AMD) <Leo.Lin@....com>
---
Changes in v3:
- Change the unit of memory carved in UMA option entry from GB to MB and use
  uint32_t instead, so that options below 1 GB can be properly recorded.
- Rename the sysfs interfaces from "uma_carveout_options" and "uma_carveout" to
  just "carveout_options" and "carveout", and put them under a new uma/ directory.
- Update docs to reflect the naming/location changes to the said sysfs files.
- Rebase to latest asdn
- Fix LKP build error
- Link to v2: https://lore.kernel.org/r/20251114-vram-carveout-tuning-for-upstream-v2-0-4f6bdd48030d@amd.com

Changes in v2:
- Move VBIOS table parsing and sysfs interface creation from atomfirmware
  initialization code to amdgpu_acpi_init()
- Create structs that abstract the uma options
- Move the parsed carveout options from atom_context to the amdgpu_atcs
- Minor kdoc fixes, as well as adding example output for uma_carveout_options
- Link to v1: https://lore.kernel.org/r/20251103-vram-carveout-tuning-for-upstream-v1-0-17e2a72639c5@amd.com

---
Yo-Jung Leo Lin (AMD) (5):
      drm/amdgpu: parse UMA size-getting/setting bits in ATCS mask
      drm/amdgpu: add helper to read UMA carveout info
      drm/amdgpu: add UMA allocation setting helpers
      drm/amdgpu: add UMA allocation interfaces to sysfs
      Documentation/amdgpu: Add UMA carveout details

 Documentation/gpu/amdgpu/driver-misc.rst         |  26 +++
 drivers/gpu/drm/amd/amdgpu/amdgpu.h              |  39 ++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c         | 215 +++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c |  77 ++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.h |   2 +
 drivers/gpu/drm/amd/include/amd_acpi.h           |  34 +++-
 6 files changed, 392 insertions(+), 1 deletion(-)
---
base-commit: 5de8ce0f3709ad93ca5a579aa45cf1b52d72bc90
change-id: 20251103-vram-carveout-tuning-for-upstream-1d5189688d73

Best regards,
-- 
Yo-Jung Leo Lin (AMD) <Leo.Lin@....com>