[PATCH 13/23] drm/amdgpu/mxgpu: add support for mailbox communication

[Alex Deucher]

On Sat, Dec 17, 2016 at 11:16 AM, Xiangliang Yu <Xiangliang.Yu at amd.com> wrote:
> GPU guest driver send mailbox messages to hyperverisor to request
> full access to all of registers and release it when access is done.
>
> Signed-off-by: Xiangliang Yu <Xiangliang.Yu at amd.com>
> Signed-off-by: shaoyunl <Shaoyun.Liu at amd.com>
> ---
>  drivers/gpu/drm/amd/mxgpu/amd_mxgpu.h |   3 +
>  drivers/gpu/drm/amd/mxgpu/mxgpu_mb.c  | 128 ++++++++++++++++++++++++++++++++++
>  2 files changed, 131 insertions(+)
>  create mode 100644 drivers/gpu/drm/amd/mxgpu/mxgpu_mb.c
>
> diff --git a/drivers/gpu/drm/amd/mxgpu/amd_mxgpu.h b/drivers/gpu/drm/amd/mxgpu/amd_mxgpu.h
> index cc3123b..54e7b31 100644
> --- a/drivers/gpu/drm/amd/mxgpu/amd_mxgpu.h
> +++ b/drivers/gpu/drm/amd/mxgpu/amd_mxgpu.h
> @@ -85,4 +85,7 @@ extern void amd_xgpu_free(struct amd_xgpu *xgpu);
>
>  extern int xgpu_allocate_csa(struct amd_xgpu *xgpu);
>  extern void xgpu_destroy_csa(struct amd_xgpu_csa *csa);
> +
> +extern int xgpu_request_full_gpu_access(struct amdgpu_device *adev, bool init);
> +extern int xgpu_release_full_gpu_access(struct amdgpu_device *adev, bool init);
>  #endif
> diff --git a/drivers/gpu/drm/amd/mxgpu/mxgpu_mb.c b/drivers/gpu/drm/amd/mxgpu/mxgpu_mb.c
> new file mode 100644
> index 0000000..b74b501
> --- /dev/null
> +++ b/drivers/gpu/drm/amd/mxgpu/mxgpu_mb.c
> @@ -0,0 +1,128 @@
> +/*
> + * Copyright 2016 Advanced Micro Devices, Inc.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> + * OTHER DEALINGS IN THE SOFTWARE.
> + *
> + * Authors: Xiangliang.Yu at amd.com
> + */
> +#include "amd_mxgpu.h"
> +#include "bif/bif_5_0_d.h"
> +#include "bif/bif_5_0_sh_mask.h"
> +
> +/* mailbox messages request */
> +enum idh_request {
> +       IDH_REQ_GPU_INIT_ACCESS = 1,
> +       IDH_REL_GPU_INIT_ACCESS,
> +       IDH_REQ_GPU_FINI_ACCESS,
> +       IDH_REL_GPU_FINI_ACCESS,
> +       IDH_REQ_GPU_RESET_ACCESS
> +};
> +
> +/* mailbox messages data */
> +enum idh_event {
> +       IDH_CLR_MSG_BUF = 0,
> +       IDH_READY_TO_ACCESS_GPU,
> +       IDH_FLR_NOTIFICATION,
> +       IDH_FLR_NOTIFICATION_CMPL
> +};
> +
> +/* mailbox state */
> +enum mail_state {
> +       AMDGPU_START_INIT = 1,
> +       AMDGPU_END_INIT,
> +       AMDGPU_START_FINI,
> +       AMDGPU_END_FINI,
> +};
> +
> +/*
> + * Mailbox communicate between PF and VF
> + */
> +static int xgpu_request_reg_access(struct amdgpu_device *adev,
> +                                  enum mail_state state)
> +{
> +       u32 temp, timeout = 150000;
> +       u32 req = IDH_REQ_GPU_INIT_ACCESS;
> +
> +       if (state == AMDGPU_START_FINI)
> +               req = IDH_REQ_GPU_FINI_ACCESS;
> +       else if (state != AMDGPU_START_INIT)
> +               return -EINVAL;
> +
> +       WREG32(mmMAILBOX_MSGBUF_TRN_DW0, req);
> +       WREG32(mmMAILBOX_CONTROL,
> +                       REG_SET_FIELD(RREG32(mmMAILBOX_CONTROL),
> +                       MAILBOX_CONTROL, TRN_MSG_VALID, 1));
> +
> +       /* wait respond from PF */
> +       while (true) {
> +               temp = RREG32(mmMAILBOX_MSGBUF_RCV_DW0);
> +               if (temp == IDH_READY_TO_ACCESS_GPU)
> +                       break;
> +               if (timeout == 0) {
> +                       pr_err("amdgpu: VF request GPU access failed(0x%x) \
> +                               in state %d\n", temp, state);
> +                       return -ETIME;
> +               }
> +               msleep(20);
> +               timeout -= 20;
> +       }
> +       return 0;
> +}
> +
> +static int xgpu_release_reg_access(struct amdgpu_device *adev,
> +                                  enum mail_state state)
> +{
> +       u32 rel = IDH_REL_GPU_INIT_ACCESS;
> +
> +       if (state == AMDGPU_END_FINI)
> +               rel = IDH_REL_GPU_FINI_ACCESS;
> +       else if (state != AMDGPU_END_INIT)
> +               return -EINVAL;
> +
> +       WREG32(mmMAILBOX_MSGBUF_TRN_DW0, rel);
> +       WREG32(mmMAILBOX_CONTROL,
> +               REG_SET_FIELD(RREG32(mmMAILBOX_CONTROL),
> +                       MAILBOX_CONTROL, TRN_MSG_VALID, 1));
> +
> +       return 0;
> +}
> +

These are gfx8 specific.  they should be handled in a gfx8 specific
code.  mxgpu_mb.c should only contain asic independent code.

Alex


> +int xgpu_request_full_gpu_access(struct amdgpu_device *adev, bool init)
> +{
> +       int r;
> +
> +       if (init)
> +               r = xgpu_request_reg_access(adev, AMDGPU_START_INIT);
> +       else
> +               r = xgpu_request_reg_access(adev, AMDGPU_START_FINI);
> +
> +       return r;
> +}
> +
> +int xgpu_release_full_gpu_access(struct amdgpu_device *adev, bool init)
> +{
> +       int r;
> +
> +       if (init)
> +               r = xgpu_release_reg_access(adev, AMDGPU_END_INIT);
> +       else
> +               r = xgpu_release_reg_access(adev, AMDGPU_END_FINI);
> +
> +       return r;
> +}
> --
> 2.7.4
>
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