drm/amdgpu/virt: impl mailbox for ai

Implement mailbox protocol for AI so that guest vf can communicate
with GPU hypervisor.

Signed-off-by: Xiangliang Yu <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Reviewed-by: Monk Liu <[e-mail]>
Acked-by: Christian König <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/Makefile

···
 amdgpu-$(CONFIG_DRM_AMDGPU_SI)+= si.o gmc_v6_0.o gfx_v6_0.o si_ih.o si_dma.o dce_v6_0.o si_dpm.o si_smc.o
 
 amdgpu-y += \
-	vi.o mxgpu_vi.o nbio_v6_1.o soc15.o
+	vi.o mxgpu_vi.o nbio_v6_1.o soc15.o mxgpu_ai.o
 
 # add GMC block
 amdgpu-y += \

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

···
+/*
+ * Copyright 2014 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.
+ *
+ */
+
+#include "amdgpu.h"
+#include "vega10/soc15ip.h"
+#include "vega10/NBIO/nbio_6_1_offset.h"
+#include "vega10/NBIO/nbio_6_1_sh_mask.h"
+#include "vega10/GC/gc_9_0_offset.h"
+#include "vega10/GC/gc_9_0_sh_mask.h"
+#include "soc15.h"
+#include "soc15_common.h"
+#include "mxgpu_ai.h"
+
+static void xgpu_ai_mailbox_send_ack(struct amdgpu_device *adev)
+{
+	u32 reg;
+	int timeout = AI_MAILBOX_TIMEDOUT;
+	u32 mask = REG_FIELD_MASK(BIF_BX_PF0_MAILBOX_CONTROL, RCV_MSG_VALID);
+
+	reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
+					     mmBIF_BX_PF0_MAILBOX_CONTROL));
+	reg = REG_SET_FIELD(reg, BIF_BX_PF0_MAILBOX_CONTROL, RCV_MSG_ACK, 1);
+	WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
+				       mmBIF_BX_PF0_MAILBOX_CONTROL), reg);
+
+	/*Wait for RCV_MSG_VALID to be 0*/
+	reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
+					     mmBIF_BX_PF0_MAILBOX_CONTROL));
+	while (reg & mask) {
+		if (timeout <= 0) {
+			pr_err("RCV_MSG_VALID is not cleared\n");
+			break;
+		}
+		mdelay(1);
+		timeout -=1;
+
+		reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
+						     mmBIF_BX_PF0_MAILBOX_CONTROL));
+	}
+}
+
+static void xgpu_ai_mailbox_set_valid(struct amdgpu_device *adev, bool val)
+{
+	u32 reg;
+
+	reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
+					     mmBIF_BX_PF0_MAILBOX_CONTROL));
+	reg = REG_SET_FIELD(reg, BIF_BX_PF0_MAILBOX_CONTROL,
+			    TRN_MSG_VALID, val ? 1 : 0);
+	WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_CONTROL),
+		      reg);
+}
+
+static void xgpu_ai_mailbox_trans_msg(struct amdgpu_device *adev,
+				      enum idh_request req)
+{
+	u32 reg;
+
+	reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
+					     mmBIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW0));
+	reg = REG_SET_FIELD(reg, BIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW0,
+			    MSGBUF_DATA, req);
+	WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW0),
+		      reg);
+
+	xgpu_ai_mailbox_set_valid(adev, true);
+}
+
+static int xgpu_ai_mailbox_rcv_msg(struct amdgpu_device *adev,
+				   enum idh_event event)
+{
+	u32 reg;
+	u32 mask = REG_FIELD_MASK(BIF_BX_PF0_MAILBOX_CONTROL, RCV_MSG_VALID);
+
+	if (event != IDH_FLR_NOTIFICATION_CMPL) {
+		reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
+						     mmBIF_BX_PF0_MAILBOX_CONTROL));
+		if (!(reg & mask))
+			return -ENOENT;
+	}
+
+	reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
+					     mmBIF_BX_PF0_MAILBOX_MSGBUF_RCV_DW0));
+	if (reg != event)
+		return -ENOENT;
+
+	xgpu_ai_mailbox_send_ack(adev);
+
+	return 0;
+}
+
+static int xgpu_ai_poll_ack(struct amdgpu_device *adev)
+{
+	int r = 0, timeout = AI_MAILBOX_TIMEDOUT;
+	u32 mask = REG_FIELD_MASK(BIF_BX_PF0_MAILBOX_CONTROL, TRN_MSG_ACK);
+	u32 reg;
+
+	reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
+					     mmBIF_BX_PF0_MAILBOX_CONTROL));
+	while (!(reg & mask)) {
+		if (timeout <= 0) {
+			pr_err("Doesn't get ack from pf.\n");
+			r = -ETIME;
+			break;
+		}
+		msleep(1);
+		timeout -= 1;
+
+		reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
+						     mmBIF_BX_PF0_MAILBOX_CONTROL));
+	}
+
+	return r;
+}
+
+static int xgpu_vi_poll_msg(struct amdgpu_device *adev, enum idh_event event)
+{
+	int r = 0, timeout = AI_MAILBOX_TIMEDOUT;
+
+	r = xgpu_ai_mailbox_rcv_msg(adev, event);
+	while (r) {
+		if (timeout <= 0) {
+			pr_err("Doesn't get ack from pf.\n");
+			r = -ETIME;
+			break;
+		}
+		msleep(1);
+		timeout -= 1;
+
+		r = xgpu_ai_mailbox_rcv_msg(adev, event);
+	}
+
+	return r;
+}
+
+
+static int xgpu_ai_send_access_requests(struct amdgpu_device *adev,
+					enum idh_request req)
+{
+	int r;
+
+	xgpu_ai_mailbox_trans_msg(adev, req);
+
+	/* start to poll ack */
+	r = xgpu_ai_poll_ack(adev);
+	if (r)
+		return r;
+
+	xgpu_ai_mailbox_set_valid(adev, false);
+
+	/* start to check msg if request is idh_req_gpu_init_access */
+	if (req == IDH_REQ_GPU_INIT_ACCESS ||
+		req == IDH_REQ_GPU_FINI_ACCESS ||
+		req == IDH_REQ_GPU_RESET_ACCESS) {
+		r = xgpu_vi_poll_msg(adev, IDH_READY_TO_ACCESS_GPU);
+		if (r)
+			return r;
+	}
+
+	return 0;
+}
+
+static int xgpu_ai_request_full_gpu_access(struct amdgpu_device *adev,
+					   bool init)
+{
+	enum idh_request req;
+
+	req = init ? IDH_REQ_GPU_INIT_ACCESS : IDH_REQ_GPU_FINI_ACCESS;
+	return xgpu_ai_send_access_requests(adev, req);
+}
+
+static int xgpu_ai_release_full_gpu_access(struct amdgpu_device *adev,
+					   bool init)
+{
+	enum idh_request req;
+	int r = 0;
+
+	req = init ? IDH_REL_GPU_INIT_ACCESS : IDH_REL_GPU_FINI_ACCESS;
+	r = xgpu_ai_send_access_requests(adev, req);
+
+	return r;
+}
+
+const struct amdgpu_virt_ops xgpu_ai_virt_ops = {
+	.req_full_gpu	= xgpu_ai_request_full_gpu_access,
+	.rel_full_gpu	= xgpu_ai_release_full_gpu_access,
+};

drivers/gpu/drm/amd/amdgpu/mxgpu_ai.h

···
+/*
+ * Copyright 2014 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.
+ *
+ */
+
+#ifndef __MXGPU_AI_H__
+#define __MXGPU_AI_H__
+
+#define AI_MAILBOX_TIMEDOUT	150000
+
+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
+};
+
+enum idh_event {
+	IDH_CLR_MSG_BUF	= 0,
+	IDH_READY_TO_ACCESS_GPU,
+	IDH_FLR_NOTIFICATION,
+	IDH_FLR_NOTIFICATION_CMPL,
+	IDH_EVENT_MAX
+};
+
+extern const struct amdgpu_virt_ops xgpu_ai_virt_ops;
+
+#endif