[PATCH 1/2] drm/amdgpu: Remap hdp coherency registers

[Zeng, Oak]

Remap HDP_MEM_COHERENCY_FLUSH_CNTL and HDP_REG_COHERENCY_FLUSH_CNTL
to an empty page in mmio space. We will later map this page to process
space so application can flush hdp. This can't be done properly at
those registers' original location because it will expose more than
desired registers to process space.

v2: Use explicit register hole location
v3: Moved remapped hdp registers into adev struct

Change-Id: Ia8d27c0c9a082711d16bbf55602bf5712a47b6d6
Signed-off-by: Oak Zeng <Oak.Zeng at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h    |  8 ++++++++
 drivers/gpu/drm/amd/amdgpu/nbio_v7_0.c |  5 ++---
 drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c |  5 ++---
 drivers/gpu/drm/amd/amdgpu/soc15.c     | 23 +++++++++++++++++++++++
 4 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index bc96ec4..40c3ba6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -642,6 +642,13 @@ struct nbio_hdp_flush_reg {
 	u32 ref_and_mask_sdma1;
 };
 
+struct remapped_hdp_reg {
+	u32 remapped_hdp_mem_flush_cntl_reg_offset;
+	u32 remapped_hdp_reg_flush_cntl_reg_offset;
+	resource_size_t remapped_hdp_mem_flush_cntl_physical_addr;
+	resource_size_t remapped_hdp_reg_flush_cntl_physical_addr;
+};
+
 struct amdgpu_nbio_funcs {
 	const struct nbio_hdp_flush_reg *hdp_flush_reg;
 	u32 (*get_hdp_flush_req_offset)(struct amdgpu_device *adev);
@@ -939,6 +946,7 @@ struct amdgpu_device {
 	struct work_struct		xgmi_reset_work;
 
 	bool                            in_baco_reset;
+	struct remapped_hdp_reg         remapped_hdp_reg;
 };
 
 static inline struct amdgpu_device *amdgpu_ttm_adev(struct ttm_bo_device *bdev)
diff --git a/drivers/gpu/drm/amd/amdgpu/nbio_v7_0.c b/drivers/gpu/drm/amd/amdgpu/nbio_v7_0.c
index 1cdb98a..d41e333 100644
--- a/drivers/gpu/drm/amd/amdgpu/nbio_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/nbio_v7_0.c
@@ -55,10 +55,9 @@ static void nbio_v7_0_hdp_flush(struct amdgpu_device *adev,
 				struct amdgpu_ring *ring)
 {
 	if (!ring || !ring->funcs->emit_wreg)
-		WREG32_SOC15_NO_KIQ(NBIO, 0, mmHDP_MEM_COHERENCY_FLUSH_CNTL, 0);
+		WREG32_NO_KIQ(adev->remapped_hdp_reg.remapped_hdp_mem_flush_cntl_reg_offset, 0);
 	else
-		amdgpu_ring_emit_wreg(ring, SOC15_REG_OFFSET(
-			NBIO, 0, mmHDP_MEM_COHERENCY_FLUSH_CNTL), 0);
+		amdgpu_ring_emit_wreg(ring, adev->remapped_hdp_reg.remapped_hdp_mem_flush_cntl_reg_offset, 0);
 }
 
 static u32 nbio_v7_0_get_memsize(struct amdgpu_device *adev)
diff --git a/drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c b/drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c
index c69d515..8f0a30e 100644
--- a/drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c
+++ b/drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c
@@ -53,10 +53,9 @@ static void nbio_v7_4_hdp_flush(struct amdgpu_device *adev,
 				struct amdgpu_ring *ring)
 {
 	if (!ring || !ring->funcs->emit_wreg)
-		WREG32_SOC15_NO_KIQ(NBIO, 0, mmHDP_MEM_COHERENCY_FLUSH_CNTL, 0);
+		WREG32_NO_KIQ(adev->remapped_hdp_reg.remapped_hdp_mem_flush_cntl_reg_offset, 0);
 	else
-		amdgpu_ring_emit_wreg(ring, SOC15_REG_OFFSET(
-			NBIO, 0, mmHDP_MEM_COHERENCY_FLUSH_CNTL), 0);
+		amdgpu_ring_emit_wreg(ring, adev->remapped_hdp_reg.remapped_hdp_mem_flush_cntl_reg_offset, 0);
 }
 
 static u32 nbio_v7_4_get_memsize(struct amdgpu_device *adev)
diff --git a/drivers/gpu/drm/amd/amdgpu/soc15.c b/drivers/gpu/drm/amd/amdgpu/soc15.c
index bdb5ad9..b84ef21 100644
--- a/drivers/gpu/drm/amd/amdgpu/soc15.c
+++ b/drivers/gpu/drm/amd/amdgpu/soc15.c
@@ -44,6 +44,7 @@
 #include "smuio/smuio_9_0_offset.h"
 #include "smuio/smuio_9_0_sh_mask.h"
 #include "nbio/nbio_7_0_default.h"
+#include "nbio/nbio_7_0_offset.h"
 #include "nbio/nbio_7_0_sh_mask.h"
 #include "nbio/nbio_7_0_smn.h"
 #include "mp/mp_9_0_offset.h"
@@ -775,6 +776,27 @@ static const struct amdgpu_asic_funcs vega20_asic_funcs =
 	.need_reset_on_init = &soc15_need_reset_on_init,
 };
 
+static void soc15_remap_hdp_coherency_registers(struct amdgpu_device *adev)
+{
+#define MMIO_REG_HOLE_OFFSET (0x80000 - PAGE_SIZE)
+	/* Remap hdp coherency registers to a hole in register space,
+	 * for the purpose of mapping them to process space(so process
+	 * can flush hdp)
+	 */
+	WREG32_SOC15(NBIO, 0, mmREMAP_HDP_MEM_FLUSH_CNTL,
+			MMIO_REG_HOLE_OFFSET);
+	WREG32_SOC15(NBIO, 0, mmREMAP_HDP_REG_FLUSH_CNTL,
+			MMIO_REG_HOLE_OFFSET+ 4);
+	adev->remapped_hdp_reg.remapped_hdp_mem_flush_cntl_reg_offset =
+			(MMIO_REG_HOLE_OFFSET) >> 2;
+	adev->remapped_hdp_reg.remapped_hdp_reg_flush_cntl_reg_offset =
+			(MMIO_REG_HOLE_OFFSET + 4) >> 2;
+	adev->remapped_hdp_reg.remapped_hdp_mem_flush_cntl_physical_addr =
+			adev->rmmio_base + MMIO_REG_HOLE_OFFSET;
+	adev->remapped_hdp_reg.remapped_hdp_reg_flush_cntl_physical_addr =
+			adev->rmmio_base + MMIO_REG_HOLE_OFFSET + 4;
+}
+
 static int soc15_common_early_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
@@ -794,6 +816,7 @@ static int soc15_common_early_init(void *handle)
 
 
 	adev->external_rev_id = 0xFF;
+	soc15_remap_hdp_coherency_registers(adev);
 	switch (adev->asic_type) {
 	case CHIP_VEGA10:
 		adev->asic_funcs = &soc15_asic_funcs;
-- 
2.7.4