[PATCH 02/44] drm/amdkfd: helper to convert gpu id and idx

[Felix Kuehling <Felix.Kuehling@amd.com>]

From: Alex Sierra <alex.sierra@amd.com>

svm range uses gpu bitmap to store which GPU svm range maps to.
Application pass driver gpu id to specify GPU, the helper is needed to
convert gpu id to gpu bitmap idx.

Access through kfd_process_device pointers array from kfd_process.

Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_priv.h    |  5 ++++
 drivers/gpu/drm/amd/amdkfd/kfd_process.c | 30 ++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index 33e56db14327..99b4624ef4c7 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -842,6 +842,11 @@ struct kfd_process *kfd_create_process(struct file *filep);
 struct kfd_process *kfd_get_process(const struct task_struct *);
 struct kfd_process *kfd_lookup_process_by_pasid(u32 pasid);
 struct kfd_process *kfd_lookup_process_by_mm(const struct mm_struct *mm);
+int kfd_process_gpuid_from_gpuidx(struct kfd_process *p,
+					uint32_t gpu_idx, uint32_t *gpuid);
+int kfd_process_gpuidx_from_gpuid(struct kfd_process *p, uint32_t gpu_id);
+int kfd_process_device_from_gpuidx(struct kfd_process *p,
+					uint32_t gpu_idx, struct kfd_dev **gpu);
 void kfd_unref_process(struct kfd_process *p);
 int kfd_process_evict_queues(struct kfd_process *p);
 int kfd_process_restore_queues(struct kfd_process *p);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index d4241d29ea94..028ebb0deddd 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -1607,6 +1607,36 @@ int kfd_process_restore_queues(struct kfd_process *p)
 	return ret;
 }
 
+int kfd_process_gpuid_from_gpuidx(struct kfd_process *p,
+					uint32_t gpu_idx, uint32_t *gpuid)
+{
+	if (gpu_idx < p->n_pdds) {
+		*gpuid = p->pdds[gpu_idx]->dev->id;
+		return 0;
+	}
+	return -EINVAL;
+}
+
+int kfd_process_gpuidx_from_gpuid(struct kfd_process *p, uint32_t gpu_id)
+{
+	int i;
+
+	for (i = 0; i < p->n_pdds; i++)
+		if (p->pdds[i] && gpu_id == p->pdds[i]->dev->id)
+			return i;
+	return -EINVAL;
+}
+
+int kfd_process_device_from_gpuidx(struct kfd_process *p,
+					uint32_t gpu_idx, struct kfd_dev **gpu)
+{
+	if (gpu_idx < p->n_pdds) {
+		*gpu = p->pdds[gpu_idx]->dev;
+		return 0;
+	}
+	return -EINVAL;
+}
+
 static void evict_process_worker(struct work_struct *work)
 {
 	int ret;
-- 
2.31.0

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