drm/amdgpu: nuke dynamic gfx scratch reg allocation

It's over a decade ago that this was actually used for more than ring and
IB tests. Just use the static register directly where needed and nuke the
now useless infrastructure.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Lang Yu <Lang.Yu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 13 insertions, 51 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
index ac3f2dbba726..0f2976507e48 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
@@ -2049,26 +2049,6 @@ static void gfx_v7_0_constants_init(struct amdgpu_device *adev)
 	udelay(50);
 }
 
-/*
- * GPU scratch registers helpers function.
- */
-/**
- * gfx_v7_0_scratch_init - setup driver info for CP scratch regs
- *
- * @adev: amdgpu_device pointer
- *
- * Set up the number and offset of the CP scratch registers.
- * NOTE: use of CP scratch registers is a legacy interface and
- * is not used by default on newer asics (r6xx+).  On newer asics,
- * memory buffers are used for fences rather than scratch regs.
- */
-static void gfx_v7_0_scratch_init(struct amdgpu_device *adev)
-{
-	adev->gfx.scratch.num_reg = 8;
-	adev->gfx.scratch.reg_base = mmSCRATCH_REG0;
-	adev->gfx.scratch.free_mask = (1u << adev->gfx.scratch.num_reg) - 1;
-}
-
 /**
  * gfx_v7_0_ring_test_ring - basic gfx ring test
  *
@@ -2082,36 +2062,28 @@ static void gfx_v7_0_scratch_init(struct amdgpu_device *adev)
 static int gfx_v7_0_ring_test_ring(struct amdgpu_ring *ring)
 {
 	struct amdgpu_device *adev = ring->adev;
-	uint32_t scratch;
 	uint32_t tmp = 0;
 	unsigned i;
 	int r;
 
-	r = amdgpu_gfx_scratch_get(adev, &scratch);
-	if (r)
-		return r;
-
-	WREG32(scratch, 0xCAFEDEAD);
+	WREG32(mmSCRATCH_REG0, 0xCAFEDEAD);
 	r = amdgpu_ring_alloc(ring, 3);
 	if (r)
-		goto error_free_scratch;
+		return r;
 
 	amdgpu_ring_write(ring, PACKET3(PACKET3_SET_UCONFIG_REG, 1));
-	amdgpu_ring_write(ring, (scratch - PACKET3_SET_UCONFIG_REG_START));
+	amdgpu_ring_write(ring, mmSCRATCH_REG0 - PACKET3_SET_UCONFIG_REG_START);
 	amdgpu_ring_write(ring, 0xDEADBEEF);
 	amdgpu_ring_commit(ring);
 
 	for (i = 0; i < adev->usec_timeout; i++) {
-		tmp = RREG32(scratch);
+		tmp = RREG32(mmSCRATCH_REG0);
 		if (tmp == 0xDEADBEEF)
 			break;
 		udelay(1);
 	}
 	if (i >= adev->usec_timeout)
 		r = -ETIMEDOUT;
-
-error_free_scratch:
-	amdgpu_gfx_scratch_free(adev, scratch);
 	return r;
 }
 
@@ -2355,48 +2327,40 @@ static int gfx_v7_0_ring_test_ib(struct amdgpu_ring *ring, long timeout)
 	struct amdgpu_device *adev = ring->adev;
 	struct amdgpu_ib ib;
 	struct dma_fence *f = NULL;
-	uint32_t scratch;
 	uint32_t tmp = 0;
 	long r;
 
-	r = amdgpu_gfx_scratch_get(adev, &scratch);
-	if (r)
-		return r;
-
-	WREG32(scratch, 0xCAFEDEAD);
+	WREG32(mmSCRATCH_REG0, 0xCAFEDEAD);
 	memset(&ib, 0, sizeof(ib));
-	r = amdgpu_ib_get(adev, NULL, 256,
-					AMDGPU_IB_POOL_DIRECT, &ib);
+	r = amdgpu_ib_get(adev, NULL, 256, AMDGPU_IB_POOL_DIRECT, &ib);
 	if (r)
-		goto err1;
+		return r;
 
 	ib.ptr[0] = PACKET3(PACKET3_SET_UCONFIG_REG, 1);
-	ib.ptr[1] = ((scratch - PACKET3_SET_UCONFIG_REG_START));
+	ib.ptr[1] = mmSCRATCH_REG0 - PACKET3_SET_UCONFIG_REG_START;
 	ib.ptr[2] = 0xDEADBEEF;
 	ib.length_dw = 3;
 
 	r = amdgpu_ib_schedule(ring, 1, &ib, NULL, &f);
 	if (r)
-		goto err2;
+		goto error;
 
 	r = dma_fence_wait_timeout(f, false, timeout);
 	if (r == 0) {
 		r = -ETIMEDOUT;
-		goto err2;
+		goto error;
 	} else if (r < 0) {
-		goto err2;
+		goto error;
 	}
-	tmp = RREG32(scratch);
+	tmp = RREG32(mmSCRATCH_REG0);
 	if (tmp == 0xDEADBEEF)
 		r = 0;
 	else
 		r = -EINVAL;
 
-err2:
+error:
 	amdgpu_ib_free(adev, &ib, NULL);
 	dma_fence_put(f);
-err1:
-	amdgpu_gfx_scratch_free(adev, scratch);
 	return r;
 }
 
@@ -4489,8 +4453,6 @@ static int gfx_v7_0_sw_init(void *handle)
 	if (r)
 		return r;
 
-	gfx_v7_0_scratch_init(adev);
-
 	r = gfx_v7_0_init_microcode(adev);
 	if (r) {
 		DRM_ERROR("Failed to load gfx firmware!\n");