drm/amdkfd: Refactor migrate init to support partition switch

Rename smv_migrate_init to a better name kgd2kfd_init_zone_device
because it setup zone devive pgmap for page migration and keep it in
kfd_migrate.c to access static functions svm_migrate_pgmap_ops. Call it
only once in amdgpu_device_ip_init after adev ip blocks are initialized,
but before amdgpu_amdkfd_device_init initialize kfd nodes which enable
SVM support based on pgmap.

svm_range_set_max_pages is called by kgd2kfd_device_init everytime after
switching compute partition mode.
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h

@@ -372,6 +372,17 @@ void amdgpu_amdkfd_release_notify(struct amdgpu_bo *bo)
 {
 }
 #endif
+
+#if IS_ENABLED(CONFIG_HSA_AMD_SVM)
+int kgd2kfd_init_zone_device(struct amdgpu_device *adev);
+#else
+static inline
+int kgd2kfd_init_zone_device(struct amdgpu_device *adev)
+{
+	return 0;
+}
+#endif
+
 /* KGD2KFD callbacks */
 int kgd2kfd_quiesce_mm(struct mm_struct *mm, uint32_t trigger);
 int kgd2kfd_resume_mm(struct mm_struct *mm);

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -2633,8 +2633,10 @@ static int amdgpu_device_ip_init(struct amdgpu_device *adev)
 		goto init_failed;
 
 	/* Don't init kfd if whole hive need to be reset during init */
-	if (!adev->gmc.xgmi.pending_reset)
+	if (!adev->gmc.xgmi.pending_reset) {
+		kgd2kfd_init_zone_device(adev);
 		amdgpu_amdkfd_device_init(adev);
+	}
 
 	amdgpu_fru_get_product_info(adev);
 

drivers/gpu/drm/amd/amdkfd/kfd_device.c

@@ -32,6 +32,7 @@
 #include "kfd_iommu.h"
 #include "amdgpu_amdkfd.h"
 #include "kfd_smi_events.h"
+#include "kfd_svm.h"
 #include "kfd_migrate.h"
 #include "amdgpu.h"
 #include "amdgpu_xcp.h"
@@ -791,7 +792,7 @@ bool kgd2kfd_device_init(struct kfd_dev *kfd,
 		kfd->nodes[i] = node;
 	}
 
-	svm_migrate_init(kfd->adev);
+	svm_range_set_max_pages(kfd->adev);
 
 	if (kfd_resume_iommu(kfd))
 		goto kfd_resume_iommu_error;

drivers/gpu/drm/amd/amdkfd/kfd_migrate.c

@@ -988,7 +988,7 @@ static const struct dev_pagemap_ops svm_migrate_pgmap_ops = {
 /* Each VRAM page uses sizeof(struct page) on system memory */
 #define SVM_HMM_PAGE_STRUCT_SIZE(size) ((size)/PAGE_SIZE * sizeof(struct page))
 
-int svm_migrate_init(struct amdgpu_device *adev)
+int kgd2kfd_init_zone_device(struct amdgpu_device *adev)
 {
 	struct amdgpu_kfd_dev *kfddev = &adev->kfd;
 	struct dev_pagemap *pgmap;
@@ -996,12 +996,10 @@ int svm_migrate_init(struct amdgpu_device *adev)
 	unsigned long size;
 	void *r;
 
-	/* Page migration works on Vega10 or newer */
-	if (!KFD_IS_SOC15(kfddev->dev))
+	/* Page migration works on gfx9 or newer */
+	if (adev->ip_versions[GC_HWIP][0] < IP_VERSION(9, 0, 1))
 		return -EINVAL;
 
-	svm_range_set_max_pages(adev);
-
 	if (adev->gmc.is_app_apu)
 		return 0;
 

drivers/gpu/drm/amd/amdkfd/kfd_migrate.h

@@ -47,15 +47,6 @@ int svm_migrate_vram_to_ram(struct svm_range *prange, struct mm_struct *mm,
 unsigned long
 svm_migrate_addr_to_pfn(struct amdgpu_device *adev, unsigned long addr);
 
-int svm_migrate_init(struct amdgpu_device *adev);
-
-#else
-
-static inline int svm_migrate_init(struct amdgpu_device *adev)
-{
-	return 0;
-}
-
 #endif /* IS_ENABLED(CONFIG_HSA_AMD_SVM) */
 
 #endif /* KFD_MIGRATE_H_ */

drivers/gpu/drm/amd/amdkfd/kfd_svm.h

@@ -265,6 +265,10 @@ static inline int kfd_criu_resume_svm(struct kfd_process *p)
 	return 0;
 }
 
+static inline void svm_range_set_max_pages(struct amdgpu_device *adev)
+{
+}
+
 #define KFD_IS_SVM_API_SUPPORTED(dev) false
 
 #endif /* IS_ENABLED(CONFIG_HSA_AMD_SVM) */