linux-kernel - [PATCH 1/3] drm/amdgpu: improve GART and GTT documentation

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Message-Id: <20221201153820.257570-2-bellosilicio@gmail.com>
Date:   Thu,  1 Dec 2022 16:38:20 +0100
From:   Peter Maucher <bellosilicio@...il.com>
To:     alexander.deucher@....com, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Peter Maucher <bellosilicio@...il.com>
Subject: [PATCH 1/3] drm/amdgpu: improve GART and GTT documentation

Document difference between amdgpu.gartsize and amdgpu.gttsize
module parameters, as initially explained by Alex Deucher here:
https://lists.freedesktop.org/archives/dri-devel/2022-October/375358.html

Signed-off-by: Peter Maucher <bellosilicio@...il.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index bf2d50c8c92a..d647836ba7b8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -230,17 +230,18 @@ module_param_named(vis_vramlimit, amdgpu_vis_vram_limit, int, 0444);
 
 /**
  * DOC: gartsize (uint)
- * Restrict the size of GART in Mib (32, 64, etc.) for testing. The default is -1 (The size depends on asic).
+ * Restrict the size of GART (for kernel use) in Mib (32, 64, etc.) for testing.
+ * The default is -1 (The size depends on asic).
  */
-MODULE_PARM_DESC(gartsize, "Size of GART to setup in megabytes (32, 64, etc., -1=auto)");
+MODULE_PARM_DESC(gartsize, "Size of kernel GART to setup in megabytes (32, 64, etc., -1=auto)");
 module_param_named(gartsize, amdgpu_gart_size, uint, 0600);
 
 /**
  * DOC: gttsize (int)
- * Restrict the size of GTT domain in MiB for testing. The default is -1 (It's VRAM size if 3GB < VRAM < 3/4 RAM,
- * otherwise 3/4 RAM size).
+ * Restrict the size of GTT domain (for userspace usage) in MiB for testing.
+ * The default is -1 (It's VRAM size if 3GB < VRAM < 3/4 RAM, otherwise 3/4 RAM size).
  */
-MODULE_PARM_DESC(gttsize, "Size of the GTT domain in megabytes (-1 = auto)");
+MODULE_PARM_DESC(gttsize, "Size of the GTT userspace domain in megabytes (-1 = auto)");
 module_param_named(gttsize, amdgpu_gtt_size, int, 0600);
 
 /**
-- 
2.38.1