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...@amd.com>
Signed-off-by: shaoyunl <shaoyun....@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...@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;
+}
+
+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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