[PATCH 2/2] drm/amd/amdgpu: Use IP discovery data to determine VCN enablement instead of MMSCH

[Bokun Zhang]

In the past, we use MMSCH to determine whether a VCN is enabled or not.
This is not reliable since after a FLR, MMSCH may report junk data.

It is better to use IP discovery data.

Change-Id: I8b6c32c34017b20dcaebffdaa78bb07178e9d03c
Signed-off-by: Bokun Zhang <Bokun.Zhang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c | 73 +++++++++++++++++----------
 1 file changed, 45 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c b/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c
index def583916294..02cac6e33219 100644
--- a/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c
@@ -27,6 +27,7 @@
 #include "amdgpu_pm.h"
 #include "soc15.h"
 #include "soc15d.h"
+#include "soc15_hw_ip.h"
 #include "vcn_v2_0.h"
 #include "mmsch_v3_0.h"
 
@@ -60,6 +61,17 @@ static int amdgpu_ucode_id_vcns[] = {
 	AMDGPU_UCODE_ID_VCN1
 };
 
+#define VCN_BLOCK_ENCODE_DISABLE_MASK 0x80
+#define VCN_BLOCK_DECODE_DISABLE_MASK 0x40
+#define VCN_BLOCK_QUEUE_DISABLE_MASK 0xC0
+
+enum vcn_ring_type {
+	VCN_ENCODE_RING,
+	VCN_DECODE_RING,
+	VCN_UNIFIED_RING,
+};
+
+static bool vcn_v3_0_is_disabled_vcn(struct amdgpu_device *adev, enum vcn_ring_type type, uint32_t vcn_instance);
 static int vcn_v3_0_start_sriov(struct amdgpu_device *adev);
 static void vcn_v3_0_set_dec_ring_funcs(struct amdgpu_device *adev);
 static void vcn_v3_0_set_enc_ring_funcs(struct amdgpu_device *adev);
@@ -311,18 +323,26 @@ static int vcn_v3_0_hw_init(void *handle)
 				continue;
 
 			ring = &adev->vcn.inst[i].ring_dec;
-			if (ring->sched.ready) {
+			if (vcn_v3_0_is_disabled_vcn(adev, VCN_DECODE_RING, i)) {
+				ring->sched.ready = false;
+				dev_info(adev->dev, "ring %s is disabled by hypervisor\n", ring->name);
+			} else {
 				ring->wptr = 0;
 				ring->wptr_old = 0;
 				vcn_v3_0_dec_ring_set_wptr(ring);
+				ring->sched.ready = true;
 			}
 
 			for (j = 0; j < adev->vcn.num_enc_rings; ++j) {
 				ring = &adev->vcn.inst[i].ring_enc[j];
-				if (ring->sched.ready) {
+				if (vcn_v3_0_is_disabled_vcn(adev, VCN_ENCODE_RING, i)) {
+					ring->sched.ready = false;
+					dev_info(adev->dev, "ring %s is disabled by hypervisor\n", ring->name);
+				} else {
 					ring->wptr = 0;
 					ring->wptr_old = 0;
 					vcn_v3_0_enc_ring_set_wptr(ring);
+					ring->sched.ready = true;
 				}
 			}
 		}
@@ -1266,6 +1286,29 @@ static int vcn_v3_0_start(struct amdgpu_device *adev)
 	return 0;
 }
 
+static bool vcn_v3_0_is_disabled_vcn(struct amdgpu_device *adev, enum vcn_ring_type type, uint32_t vcn_instance)
+{
+	bool ret = false;
+
+	int major;
+	int minor;
+	int revision;
+
+	/* if cannot find IP data, then this VCN does not exist */
+	if (amdgpu_discovery_get_ip_version(adev, VCN_HWID, vcn_instance, &major, &minor, &revision) != 0)
+		return true;
+
+	if ((type == VCN_ENCODE_RING) && (revision & VCN_BLOCK_ENCODE_DISABLE_MASK)) {
+		ret = true;
+	} else if ((type == VCN_DECODE_RING) && (revision & VCN_BLOCK_DECODE_DISABLE_MASK)) {
+		ret = true;
+	} else if ((type == VCN_UNIFIED_RING) && (revision & VCN_BLOCK_QUEUE_DISABLE_MASK)) {
+		ret = true;
+	}
+
+	return ret;
+}
+
 static int vcn_v3_0_start_sriov(struct amdgpu_device *adev)
 {
 	int i, j;
@@ -1283,8 +1326,6 @@ static int vcn_v3_0_start_sriov(struct amdgpu_device *adev)
 	uint32_t table_size;
 	uint32_t size, size_dw;
 
-	bool is_vcn_ready;
-
 	struct mmsch_v3_0_cmd_direct_write
 		direct_wt = { {0} };
 	struct mmsch_v3_0_cmd_direct_read_modify_write
@@ -1476,30 +1517,6 @@ static int vcn_v3_0_start_sriov(struct amdgpu_device *adev)
 		}
 	}
 
-	/* 6, check each VCN's init_status
-	 * if it remains as 0, then this VCN is not assigned to current VF
-	 * do not start ring for this VCN
-	 */
-	size = sizeof(struct mmsch_v3_0_init_header);
-	table_loc = (uint32_t *)table->cpu_addr;
-	memcpy(&header, (void *)table_loc, size);
-
-	for (i = 0; i < adev->vcn.num_vcn_inst; i++) {
-		if (adev->vcn.harvest_config & (1 << i))
-			continue;
-
-		is_vcn_ready = (header.inst[i].init_status == 1);
-		if (!is_vcn_ready)
-			DRM_INFO("VCN(%d) engine is disabled by hypervisor\n", i);
-
-		ring = &adev->vcn.inst[i].ring_dec;
-		ring->sched.ready = is_vcn_ready;
-		for (j = 0; j < adev->vcn.num_enc_rings; ++j) {
-			ring = &adev->vcn.inst[i].ring_enc[j];
-			ring->sched.ready = is_vcn_ready;
-		}
-	}
-
 	return 0;
 }
 
-- 
2.25.1