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drm/amdgpu: SR-IOV data exchange between PF&VF

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SR-IOV need to exchange some data between PF&VF through shared VRAM

PF will copy some necessary firmware and information to the shared
VRAM. It also requires some information from VF. PF will send a
key through mailbox2 to help guest calculate checksum so that it can
verify whether the data is correct.

So check the data on the specified offset of the shared VRAM, if the
checksum is right, read values from it and write some VF information
next to the data from PF.

Signed-off-by: Horace Chen <horace.chen@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Horace Chen 2017-10-09 16:17:16 +08:00 • committed by Alex Deucher
parent 0ae94444c0
commit 2dc8f81e4f
4 changed files with 262 additions and 0 deletions
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6
drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c
View file

@ -183,6 +183,12 @@ static int xgpu_ai_send_access_requests(struct amdgpu_device *adev,
pr_err("Doesn't get READY_TO_ACCESS_GPU from pf, give up\n");
return r;
}
/* Retrieve checksum from mailbox2 */
if (req == IDH_REQ_GPU_INIT_ACCESS) {
adev->virt.fw_reserve.checksum_key =
RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
mmBIF_BX_PF0_MAILBOX_MSGBUF_RCV_DW2));
}
}
return 0;