drm/amd: Mark amdgpu.gttsize parameter as deprecated and show warnings on use

When not set `gttsize` module parameter by default will get the
value to use for the GTT pool from the TTM page limit, which is
set by a separate module parameter.

This inevitably leads to people not sure which one to set when they
want more addressable memory for the GPU, and you'll end up seeing
instructions online saying to set both.

Add some messages to try to guide people both who are using or misusing
the parameters and mark the parameter as deprecated with the plan to
drop it after the next LTS kernel release.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 13 insertions, 4 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 01ae2f88dec8..3f61c999fde3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1964,10 +1964,19 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
 	/* Compute GTT size, either based on TTM limit
 	 * or whatever the user passed on module init.
 	 */
-	if (amdgpu_gtt_size == -1)
-		gtt_size = ttm_tt_pages_limit() << PAGE_SHIFT;
-	else
-		gtt_size = (uint64_t)amdgpu_gtt_size << 20;
+	gtt_size = ttm_tt_pages_limit() << PAGE_SHIFT;
+	if (amdgpu_gtt_size != -1) {
+		uint64_t configured_size = (uint64_t)amdgpu_gtt_size << 20;
+
+		drm_warn(&adev->ddev,
+			"Configuring gttsize via module parameter is deprecated, please use ttm.pages_limit\n");
+		if (gtt_size != configured_size)
+			drm_warn(&adev->ddev,
+				"GTT size has been set as %llu but TTM size has been set as %llu, this is unusual\n",
+				configured_size, gtt_size);
+
+		gtt_size = configured_size;
+	}
 
 	/* Initialize GTT memory pool */
 	r = amdgpu_gtt_mgr_init(adev, gtt_size);