Commit 7b3fe663 authored Nov 04, 2019 by Hawking Zhang Committed by Greg Kroah-Hartman Dec 31, 2019

drm/amdgpu: disallow direct upload save restore list from gfx driver



[ Upstream commit 58f46d4b65021083ef4b4d49c6e2c58e5783f626 ]

Direct uploading save/restore list via mmio register writes breaks the security
policy. Instead, the driver should pass s&r list to psp.

For all the ASICs that use rlc v2_1 headers, the driver actually upload s&r list
twice, in non-psp ucode front door loading phase and gfx pg initialization phase.
The latter is not allowed.

VG12 is the only exception where the driver still keeps legacy approach for S&R
list uploading. In theory, this can be elimnated if we have valid srcntl ucode
for VG12.

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Candice Li <Candice.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent 6ad06c84

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -2187,6 +2187,7 @@ static void gfx_v9_0_init_pg(struct amdgpu_device *adev)
		* And it's needed by gfxoff feature.
		*/
		if (adev->gfx.rlc.is_rlc_v2_1) {
		if (adev->asic_type == CHIP_VEGA12)
		gfx_v9_1_init_rlc_save_restore_list(adev);
		gfx_v9_0_enable_save_restore_machine(adev);
		}