drm/amdgpu: add helper for rlcg indirect reg access

The helper will be used to access registers from sriov
guest in full access time

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Zhou, Peng Ju <PengJu.Zhou@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 111 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
index a40e4fcdfa46..8c27d31f3e53 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -855,3 +855,114 @@ bool amdgpu_virt_get_rlcg_reg_access_flag(struct amdgpu_device *adev, u32 acc_fl
 	}
 	return ret;
 }
+
+static u32 amdgpu_virt_rlcg_reg_rw(struct amdgpu_device *adev, u32 offset, u32 v, u32 flag)
+{
+	struct amdgpu_rlcg_reg_access_ctrl *reg_access_ctrl;
+	uint32_t timeout = 50000;
+	uint32_t i, tmp;
+	uint32_t ret = 0;
+	static void *scratch_reg0;
+	static void *scratch_reg1;
+	static void *scratch_reg2;
+	static void *scratch_reg3;
+	static void *spare_int;
+
+	if (!adev->gfx.rlc.rlcg_reg_access_supported) {
+		dev_err(adev->dev,
+			"indirect registers access through rlcg is not available\n");
+		return 0;
+	}
+
+	scratch_reg0 = (void __iomem *)adev->rmmio + 4 * reg_access_ctrl->scratch_reg0;
+	scratch_reg1 = (void __iomem *)adev->rmmio + 4 * reg_access_ctrl->scratch_reg1;
+	scratch_reg2 = (void __iomem *)adev->rmmio + 4 * reg_access_ctrl->scratch_reg2;
+	scratch_reg3 = (void __iomem *)adev->rmmio + 4 * reg_access_ctrl->scratch_reg3;
+	if (reg_access_ctrl->spare_int)
+		spare_int = (void __iomem *)adev->rmmio + 4 * reg_access_ctrl->spare_int;
+
+	if (offset == reg_access_ctrl->grbm_cntl) {
+		/* if the target reg offset is grbm_cntl, write to scratch_reg2 */
+		writel(v, scratch_reg2);
+		writel(v, ((void __iomem *)adev->rmmio) + (offset * 4));
+	} else if (offset == reg_access_ctrl->grbm_idx) {
+		/* if the target reg offset is grbm_idx, write to scratch_reg3 */
+		writel(v, scratch_reg3);
+		writel(v, ((void __iomem *)adev->rmmio) + (offset * 4));
+	} else {
+		/*
+		 * SCRATCH_REG0 	= read/write value
+		 * SCRATCH_REG1[30:28]	= command
+		 * SCRATCH_REG1[19:0]	= address in dword
+		 * SCRATCH_REG1[26:24]	= Error reporting
+		 */
+		writel(v, scratch_reg0);
+		writel((offset | flag), scratch_reg1);
+		if (reg_access_ctrl->spare_int)
+			writel(1, spare_int);
+
+		for (i = 0; i < timeout; i++) {
+			tmp = readl(scratch_reg1);
+			if (!(tmp & flag))
+				break;
+			udelay(10);
+		}
+
+		if (i >= timeout) {
+			if (amdgpu_sriov_rlcg_error_report_enabled(adev)) {
+				if (tmp & AMDGPU_RLCG_VFGATE_DISABLED) {
+					dev_err(adev->dev,
+						"vfgate is disabled, rlcg failed to program reg: 0x%05x\n", offset);
+				} else if (tmp & AMDGPU_RLCG_WRONG_OPERATION_TYPE) {
+					dev_err(adev->dev,
+						"wrong operation type, rlcg failed to program reg: 0x%05x\n", offset);
+				} else if (tmp & AMDGPU_RLCG_REG_NOT_IN_RANGE) {
+					dev_err(adev->dev,
+						"regiser is not in range, rlcg failed to program reg: 0x%05x\n", offset);
+				} else {
+					dev_err(adev->dev,
+						"unknown error type, rlcg failed to program reg: 0x%05x\n", offset);
+				}
+			} else {
+				dev_err(adev->dev,
+					"timeout: rlcg faled to program reg: 0x%05x\n", offset);
+			}
+		}
+	}
+
+	ret = readl(scratch_reg0);
+	return ret;
+}
+
+void amdgpu_sriov_wreg(struct amdgpu_device *adev,
+		       u32 offset, u32 value,
+		       u32 acc_flags, u32 hwip)
+{
+	u32 rlcg_flag;
+
+	if (!amdgpu_sriov_runtime(adev) &&
+	    amdgpu_virt_get_rlcg_reg_access_flag(adev, acc_flags, hwip, true, &rlcg_flag)) {
+		amdgpu_virt_rlcg_reg_rw(adev, offset, value, rlcg_flag);
+		return;
+	}
+
+	if (acc_flags & AMDGPU_REGS_NO_KIQ)
+		WREG32_NO_KIQ(offset, value);
+	else
+		WREG32(offset, value);
+}
+
+u32 amdgpu_sriov_rreg(struct amdgpu_device *adev,
+		      u32 offset, u32 acc_flags, u32 hwip)
+{
+	u32 rlcg_flag;
+
+	if (!amdgpu_sriov_runtime(adev) &&
+	    amdgpu_virt_get_rlcg_reg_access_flag(adev, acc_flags, hwip, false, &rlcg_flag))
+		return amdgpu_virt_rlcg_reg_rw(adev, offset, 0, rlcg_flag);
+
+	if (acc_flags & AMDGPU_REGS_NO_KIQ)
+		return RREG32_NO_KIQ(offset);
+	else
+		return RREG32(offset);
+}