[PATCH] drm/amd/amdgpu: reserve vm invalidation engine for firmware

[Zhang, Hawking]

[AMD Official Use Only - General]

Reviewed-by: Hawking Zhang <Hawking.Zhang at amd.com>

Regards,
Hawking
-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Jack Xiao
Sent: Thursday, November 17, 2022 17:11
To: amd-gfx at lists.freedesktop.org; Deucher, Alexander <Alexander.Deucher at amd.com>; Zhang, Hawking <Hawking.Zhang at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>; Pan, Xinhui <Xinhui.Pan at amd.com>; Sider, Graham <Graham.Sider at amd.com>
Cc: Xiao, Jack <Jack.Xiao at amd.com>
Subject: [PATCH] drm/amd/amdgpu: reserve vm invalidation engine for firmware

If mes enabled, reserve VM invalidation engine 5 for firmware.

Signed-off-by: Jack Xiao <Jack.Xiao at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 4365ede42855..e970e3760cec 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -479,6 +479,12 @@ int amdgpu_gmc_allocate_vm_inv_eng(struct amdgpu_device *adev)
 	unsigned i;
 	unsigned vmhub, inv_eng;
 
+	if (adev->enable_mes) {
+		/* reserve engine 5 for firmware */
+		for (vmhub = 0; vmhub < AMDGPU_MAX_VMHUBS; vmhub++)
+			vm_inv_engs[vmhub] &= ~(1 << 5);
+	}
+
 	for (i = 0; i < adev->num_rings; ++i) {
 		ring = adev->rings[i];
 		vmhub = ring->funcs->vmhub;
-- 
2.37.3