drm/amd/display: DC VM Fixes

[Why]
VM_helper needs to be intialized with the dc struct in order to fix
an unallocated memory issue. System aperture settings should be
initialized to 0 and guarded with a check to make sure vm_config
is valid.

[How]
Allocate and free memory for vm_helper with other dc members.
Check whether the vm_config valid bit is set before initializing
aperture settings.
Signed-off-by: Eryk Brol <eryk.brol@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -621,7 +621,6 @@ static bool construct(struct dc *dc,
 #endif
 
 	enum dce_version dc_version = DCE_VERSION_UNKNOWN;
-
 	dc_dceip = kzalloc(sizeof(*dc_dceip), GFP_KERNEL);
 	if (!dc_dceip) {
 		dm_error("%s: failed to create dceip\n", __func__);

drivers/gpu/drm/amd/display/dc/core/dc_vm_helper.c

@@ -112,16 +112,12 @@ uint8_t get_vmid_for_ptb(struct vm_helper *vm_helper, int64_t ptb, uint8_t hubp_
 	return vmid;
 }
 
-struct vm_helper init_vm_helper(unsigned int num_vmid, unsigned int num_hubp)
+void init_vm_helper(struct vm_helper *vm_helper, unsigned int num_vmid, unsigned int num_hubp)
 {
-	static uint64_t ptb_assigned_to_vmid[MAX_VMID];
-	static struct vmid_usage hubp_vmid_usage[MAX_HUBP];
-
-	return (struct vm_helper){
-		.num_vmid = num_vmid,
-		.num_hubp = num_hubp,
-		.num_vmids_available = num_vmid - 1,
-		.ptb_assigned_to_vmid = ptb_assigned_to_vmid,
-		.hubp_vmid_usage = hubp_vmid_usage
-	};
+	vm_helper->num_vmid = num_vmid;
+	vm_helper->num_hubp = num_hubp;
+	vm_helper->num_vmids_available = num_vmid - 1;
+
+	memset(vm_helper->hubp_vmid_usage, 0, sizeof(vm_helper->hubp_vmid_usage[0]) * MAX_HUBP);
+	memset(vm_helper->ptb_assigned_to_vmid, 0, sizeof(vm_helper->ptb_assigned_to_vmid[0]) * MAX_VMID);
 }

drivers/gpu/drm/amd/display/dc/dc.h

@@ -265,7 +265,6 @@ struct dc_debug_data {
 	uint32_t auxErrorCount;
 };
 
-
 struct dc_state;
 struct resource_pool;
 struct dce_hwseq;

drivers/gpu/drm/amd/display/dc/inc/vm_helper.h

@@ -39,8 +39,8 @@ struct vm_helper {
 	unsigned int num_vmid;
 	unsigned int num_hubp;
 	unsigned int num_vmids_available;
-	uint64_t *ptb_assigned_to_vmid;
-	struct vmid_usage *hubp_vmid_usage;
+	uint64_t ptb_assigned_to_vmid[MAX_VMID];
+	struct vmid_usage hubp_vmid_usage[MAX_HUBP];
 };
 
 uint8_t get_vmid_for_ptb(
@@ -48,7 +48,8 @@ uint8_t get_vmid_for_ptb(
 		int64_t ptb,
 		uint8_t pipe_idx);
 
-struct vm_helper init_vm_helper(
+void init_vm_helper(
+	struct vm_helper *vm_helper,
 	unsigned int num_vmid,
 	unsigned int num_hubp);