[PATCH v3 2/3] drm/amdgpu: sdma support for sriov cpx mode

[Samir Dhume <samir.dhume@xxxxxxx>]

sdma has 2 instances in SRIOV cpx mode. Odd numbered VFs have
sdma0/sdma1 instances. Even numbered vfs have sdma2/sdma3.
Changes involve
1. identifying odd/even numbered VF
2. registering correct number of instances with irq handler
3. mapping instance number with IH client-id depending upon
whether vf is odd/even numbered.

v2:
1. fix for correct number of instances registered with irq
2. remove mmio access from interrupt handler. Use xcc_mask to
detect cpx mode.

v3:
1. restore all instances registered with irq in case there is
harvesting of some sdma instances.

Signed-off-by: Samir Dhume <samir.dhume@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
index eaa4f5f49949..01d1024e91ed 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
@@ -82,7 +82,7 @@ static unsigned sdma_v4_4_2_seq_to_irq_id(int seq_num)
 	}
 }
 
-static int sdma_v4_4_2_irq_id_to_seq(unsigned client_id)
+static int sdma_v4_4_2_irq_id_to_seq(struct amdgpu_device *adev, unsigned client_id)
 {
 	switch (client_id) {
 	case SOC15_IH_CLIENTID_SDMA0:
@@ -90,9 +90,15 @@ static int sdma_v4_4_2_irq_id_to_seq(unsigned client_id)
 	case SOC15_IH_CLIENTID_SDMA1:
 		return 1;
 	case SOC15_IH_CLIENTID_SDMA2:
-		return 2;
+		if (amdgpu_sriov_vf(adev) && (adev->gfx.xcc_mask == 0x1))
+			return 0;
+		else
+			return 2;
 	case SOC15_IH_CLIENTID_SDMA3:
-		return 3;
+		if (amdgpu_sriov_vf(adev) && (adev->gfx.xcc_mask == 0x1))
+			return 1;
+		else
+			return 3;
 	default:
 		return -EINVAL;
 	}
@@ -1541,7 +1547,7 @@ static int sdma_v4_4_2_process_trap_irq(struct amdgpu_device *adev,
 	uint32_t instance, i;
 
 	DRM_DEBUG("IH: SDMA trap\n");
-	instance = sdma_v4_4_2_irq_id_to_seq(entry->client_id);
+	instance = sdma_v4_4_2_irq_id_to_seq(adev, entry->client_id);
 
 	/* Client id gives the SDMA instance in AID. To know the exact SDMA
 	 * instance, interrupt entry gives the node id which corresponds to the AID instance.
@@ -1584,7 +1590,7 @@ static int sdma_v4_4_2_process_ras_data_cb(struct amdgpu_device *adev,
 	if (amdgpu_ras_is_supported(adev, AMDGPU_RAS_BLOCK__SDMA))
 		goto out;
 
-	instance = sdma_v4_4_2_irq_id_to_seq(entry->client_id);
+	instance = sdma_v4_4_2_irq_id_to_seq(adev, entry->client_id);
 	if (instance < 0)
 		goto out;
 
@@ -1603,7 +1609,7 @@ static int sdma_v4_4_2_process_illegal_inst_irq(struct amdgpu_device *adev,
 
 	DRM_ERROR("Illegal instruction in SDMA command stream\n");
 
-	instance = sdma_v4_4_2_irq_id_to_seq(entry->client_id);
+	instance = sdma_v4_4_2_irq_id_to_seq(adev, entry->client_id);
 	if (instance < 0)
 		return 0;
 
@@ -1647,7 +1653,7 @@ static int sdma_v4_4_2_print_iv_entry(struct amdgpu_device *adev,
 	struct amdgpu_task_info *task_info;
 	u64 addr;
 
-	instance = sdma_v4_4_2_irq_id_to_seq(entry->client_id);
+	instance = sdma_v4_4_2_irq_id_to_seq(adev, entry->client_id);
 	if (instance < 0 || instance >= adev->sdma.num_instances) {
 		dev_err(adev->dev, "sdma instance invalid %d\n", instance);
 		return -EINVAL;
-- 
2.34.1