[PATCH 12/20] drm/amdgpu:impl mm_r/weg_nokiq

[Monk Liu]

some registers are pf&vf copy, and we can safely use
mmio method to access them.

and some time we are forbid to use kiq to access register
like in INTR context.

Change-Id: Ie6dc323dc86829a4a6ceb7073c269b106b534c4a
Signed-off-by: Monk Liu <Monk.Liu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h        | 10 +++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 36 ++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 402a895..5dd0615 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1509,6 +1509,11 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 void amdgpu_device_fini(struct amdgpu_device *adev);
 int amdgpu_gpu_wait_for_idle(struct amdgpu_device *adev);
 
+uint32_t amdgpu_mm_rreg_nokiq(struct amdgpu_device *adev, uint32_t reg,
+			bool always_indirect);
+void amdgpu_mm_wreg_nokiq(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
+		    bool always_indirect);
+
 uint32_t amdgpu_mm_rreg(struct amdgpu_device *adev, uint32_t reg,
 			bool always_indirect);
 void amdgpu_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
@@ -1523,6 +1528,11 @@ bool amdgpu_device_has_dc_support(struct amdgpu_device *adev);
 /*
  * Registers read & write functions.
  */
+#define RREG32_nokiq(reg) amdgpu_mm_rreg_nokiq(adev, (reg), false)
+#define RREG32_IDX_nokiq(reg) amdgpu_mm_rreg(adev, (reg), true)
+#define WREG32_nokiq(reg, v) amdgpu_mm_wreg_nokiq(adev, (reg), (v), false)
+#define WREG32_IDX_nokiq(reg, v) amdgpu_mm_wreg_nokiq(adev, (reg), (v), true)
+
 #define RREG32(reg) amdgpu_mm_rreg(adev, (reg), false)
 #define RREG32_IDX(reg) amdgpu_mm_rreg(adev, (reg), true)
 #define DREG32(reg) printk(KERN_INFO "REGISTER: " #reg " : 0x%08X\n", amdgpu_mm_rreg(adev, (reg), false))
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 2b404ca..d5870d0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -136,6 +136,42 @@ void amdgpu_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
 	}
 }
 
+uint32_t amdgpu_mm_rreg_nokiq(struct amdgpu_device *adev, uint32_t reg,
+			bool always_indirect)
+{
+	uint32_t ret;
+
+	if ((reg * 4) < adev->rmmio_size && !always_indirect)
+		ret = readl(((void __iomem *)adev->rmmio) + (reg * 4));
+	else {
+		unsigned long flags;
+
+		spin_lock_irqsave(&adev->mmio_idx_lock, flags);
+		writel((reg * 4), ((void __iomem *)adev->rmmio) + (mmMM_INDEX * 4));
+		ret = readl(((void __iomem *)adev->rmmio) + (mmMM_DATA * 4));
+		spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
+	}
+	trace_amdgpu_mm_rreg(adev->pdev->device, reg, ret);
+	return ret;
+}
+
+void amdgpu_mm_wreg_nokiq(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
+		    bool always_indirect)
+{
+	trace_amdgpu_mm_wreg(adev->pdev->device, reg, v);
+
+	if ((reg * 4) < adev->rmmio_size && !always_indirect)
+		writel(v, ((void __iomem *)adev->rmmio) + (reg * 4));
+	else {
+		unsigned long flags;
+
+		spin_lock_irqsave(&adev->mmio_idx_lock, flags);
+		writel((reg * 4), ((void __iomem *)adev->rmmio) + (mmMM_INDEX * 4));
+		writel(v, ((void __iomem *)adev->rmmio) + (mmMM_DATA * 4));
+		spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
+	}
+}
+
 u32 amdgpu_io_rreg(struct amdgpu_device *adev, u32 reg)
 {
 	if ((reg * 4) < adev->rio_mem_size)
-- 
2.7.4