linux-kernel - [PATCH 1/5] drm/amdgpu: parse UMA size-getting/setting bits in ATCS mask

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Message-ID: <20251103-vram-carveout-tuning-for-upstream-v1-1-17e2a72639c5@amd.com>
Date: Mon, 3 Nov 2025 15:51:04 +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>, "Yo-Jung Leo Lin
 (AMD)" <Leo.Lin@....com>, <anson.tsao@....com>, <superm1@...nel.org>
Subject: [PATCH 1/5] drm/amdgpu: parse UMA size-getting/setting bits in
 ATCS mask

The capabilities of getting and setting VRAM carveout size are exposed
in the ATCS mask. Parse and store these capabilities for future use.

Co-developed-by: Mario Limonciello (AMD) <superm1@...nel.org>
Signed-off-by: Mario Limonciello (AMD) <superm1@...nel.org>
Signed-off-by: Yo-Jung Leo Lin (AMD) <Leo.Lin@....com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 4 ++++
 drivers/gpu/drm/amd/include/amd_acpi.h   | 4 +++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 6c62e27b9800..0743fd8620e4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -116,7 +116,9 @@ struct amdgpu_atcs_functions {
 	bool pcie_perf_req;
 	bool pcie_dev_rdy;
 	bool pcie_bus_width;
+	bool get_uma_size;
 	bool power_shift_control;
+	bool set_uma_allocation_size;
 };
 
 struct amdgpu_atcs {
@@ -588,7 +590,9 @@ static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mas
 	f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
 	f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
 	f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
+	f->get_uma_size = mask & ACPI_ATCS_GET_UMA_SIZE_SUPPORTED;
 	f->power_shift_control = mask & ATCS_SET_POWER_SHIFT_CONTROL_SUPPORTED;
+	f->set_uma_allocation_size = mask & ACPI_ATCS_SET_UMA_ALLOCATION_SIZE_SUPPORTED;
 }
 
 /**
diff --git a/drivers/gpu/drm/amd/include/amd_acpi.h b/drivers/gpu/drm/amd/include/amd_acpi.h
index 06badbf0c5b9..e582339e8e8e 100644
--- a/drivers/gpu/drm/amd/include/amd_acpi.h
+++ b/drivers/gpu/drm/amd/include/amd_acpi.h
@@ -427,7 +427,9 @@ struct atcs_pwr_shift_input {
 #       define ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED             (1 << 1)
 #       define ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED       (1 << 2)
 #       define ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED                   (1 << 3)
-#       define ATCS_SET_POWER_SHIFT_CONTROL_SUPPORTED		   (1 << 7)
+#       define ACPI_ATCS_GET_UMA_SIZE_SUPPORTED                    (1 << 5)
+#       define ATCS_SET_POWER_SHIFT_CONTROL_SUPPORTED              (1 << 7)
+#       define ACPI_ATCS_SET_UMA_ALLOCATION_SIZE_SUPPORTED         (1 << 9)
 #define ATCS_FUNCTION_GET_EXTERNAL_STATE                           0x1
 /* ARG0: ATCS_FUNCTION_GET_EXTERNAL_STATE
  * ARG1: none

-- 
2.43.0