habanalabs: Save context in a command buffer object

Future changes require using a context while handling a command buffer,
and thus need to save the context in the command buffer object.
Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

drivers/misc/habanalabs/common/command_buffer.c

@@ -47,6 +47,8 @@ static void cb_release(struct kref *ref)
 
 	hl_debugfs_remove_cb(cb);
 
+	hl_ctx_put(cb->ctx);
+
 	cb_do_release(hdev, cb);
 }
 
@@ -107,11 +109,12 @@ static struct hl_cb *hl_cb_alloc(struct hl_device *hdev, u32 cb_size,
 }
 
 int hl_cb_create(struct hl_device *hdev, struct hl_cb_mgr *mgr,
-			u32 cb_size, u64 *handle, int ctx_id, bool internal_cb)
+			struct hl_ctx *ctx, u32 cb_size, bool internal_cb,
+			u64 *handle)
 {
 	struct hl_cb *cb;
 	bool alloc_new_cb = true;
-	int rc;
+	int rc, ctx_id = ctx->asid;
 
 	/*
 	 * Can't use generic function to check this because of special case
@@ -163,7 +166,8 @@ int hl_cb_create(struct hl_device *hdev, struct hl_cb_mgr *mgr,
 	}
 
 	cb->hdev = hdev;
-	cb->ctx_id = ctx_id;
+	cb->ctx = ctx;
+	hl_ctx_get(hdev, cb->ctx);
 
 	spin_lock(&mgr->cb_lock);
 	rc = idr_alloc(&mgr->cb_handles, cb, 1, 0, GFP_ATOMIC);
@@ -191,6 +195,7 @@ int hl_cb_create(struct hl_device *hdev, struct hl_cb_mgr *mgr,
 	return 0;
 
 release_cb:
+	hl_ctx_put(cb->ctx);
 	cb_do_release(hdev, cb);
 out_err:
 	*handle = 0;
@@ -250,9 +255,8 @@ int hl_cb_ioctl(struct hl_fpriv *hpriv, void *data)
 				args->in.cb_size, HL_MAX_CB_SIZE);
 			rc = -EINVAL;
 		} else {
-			rc = hl_cb_create(hdev, &hpriv->cb_mgr,
-					args->in.cb_size, &handle,
-					hpriv->ctx->asid, false);
+			rc = hl_cb_create(hdev, &hpriv->cb_mgr, hpriv->ctx,
+					args->in.cb_size, false, &handle);
 		}
 
 		memset(args, 0, sizeof(*args));
@@ -424,7 +428,7 @@ void hl_cb_mgr_fini(struct hl_device *hdev, struct hl_cb_mgr *mgr)
 		if (kref_put(&cb->refcount, cb_release) != 1)
 			dev_err(hdev->dev,
 				"CB %d for CTX ID %d is still alive\n",
-				id, cb->ctx_id);
+				id, cb->ctx->asid);
 	}
 
 	idr_destroy(&mgr->cb_handles);
@@ -437,8 +441,8 @@ struct hl_cb *hl_cb_kernel_create(struct hl_device *hdev, u32 cb_size,
 	struct hl_cb *cb;
 	int rc;
 
-	rc = hl_cb_create(hdev, &hdev->kernel_cb_mgr, cb_size, &cb_handle,
-			HL_KERNEL_ASID_ID, internal_cb);
+	rc = hl_cb_create(hdev, &hdev->kernel_cb_mgr, hdev->kernel_ctx, cb_size,
+				internal_cb, &cb_handle);
 	if (rc) {
 		dev_err(hdev->dev,
 			"Failed to allocate CB for the kernel driver %d\n", rc);

drivers/misc/habanalabs/common/debugfs.c

@@ -111,7 +111,7 @@ static int command_buffers_show(struct seq_file *s, void *data)
 		}
 		seq_printf(s,
 			"   %03llu        %d    0x%08x      %d          %d          %d\n",
-			cb->id, cb->ctx_id, cb->size,
+			cb->id, cb->ctx->asid, cb->size,
 			kref_read(&cb->refcount),
 			cb->mmap, cb->cs_cnt);
 	}

drivers/misc/habanalabs/common/habanalabs.h

@@ -417,6 +417,7 @@ struct hl_cb_mgr {
  * struct hl_cb - describes a Command Buffer.
  * @refcount: reference counter for usage of the CB.
  * @hdev: pointer to device this CB belongs to.
+ * @ctx: pointer to the CB owner's context.
  * @lock: spinlock to protect mmap/cs flows.
  * @debugfs_list: node in debugfs list of command buffers.
  * @pool_list: node in pool list of command buffers.
@@ -426,7 +427,6 @@ struct hl_cb_mgr {
  * @mmap_size: Holds the CB's size that was mmaped.
  * @size: holds the CB's size.
  * @cs_cnt: holds number of CS that this CB participates in.
- * @ctx_id: holds the ID of the owner's context.
  * @mmap: true if the CB is currently mmaped to user.
  * @is_pool: true if CB was acquired from the pool, false otherwise.
  * @is_internal: internaly allocated
@@ -434,6 +434,7 @@ struct hl_cb_mgr {
 struct hl_cb {
 	struct kref		refcount;
 	struct hl_device	*hdev;
+	struct hl_ctx		*ctx;
 	spinlock_t		lock;
 	struct list_head	debugfs_list;
 	struct list_head	pool_list;
@@ -443,7 +444,6 @@ struct hl_cb {
 	u32			mmap_size;
 	u32			size;
 	u32			cs_cnt;
-	u32			ctx_id;
 	u8			mmap;
 	u8			is_pool;
 	u8			is_internal;
@@ -1838,8 +1838,9 @@ void hl_sysfs_fini(struct hl_device *hdev);
 int hl_hwmon_init(struct hl_device *hdev);
 void hl_hwmon_fini(struct hl_device *hdev);
 
-int hl_cb_create(struct hl_device *hdev, struct hl_cb_mgr *mgr, u32 cb_size,
-		u64 *handle, int ctx_id, bool internal_cb);
+int hl_cb_create(struct hl_device *hdev, struct hl_cb_mgr *mgr,
+			struct hl_ctx *ctx, u32 cb_size, bool internal_cb,
+			u64 *handle);
 int hl_cb_destroy(struct hl_device *hdev, struct hl_cb_mgr *mgr, u64 cb_handle);
 int hl_cb_mmap(struct hl_fpriv *hpriv, struct vm_area_struct *vma);
 struct hl_cb *hl_cb_get(struct hl_device *hdev,	struct hl_cb_mgr *mgr,

drivers/misc/habanalabs/gaudi/gaudi.c

@@ -4114,8 +4114,9 @@ static int gaudi_parse_cb_mmu(struct hl_device *hdev,
 	parser->patched_cb_size = parser->user_cb_size +
 			sizeof(struct packet_msg_prot) * 2;
 
-	rc = hl_cb_create(hdev, &hdev->kernel_cb_mgr, parser->patched_cb_size,
-			&patched_cb_handle, HL_KERNEL_ASID_ID, false);
+	rc = hl_cb_create(hdev, &hdev->kernel_cb_mgr, hdev->kernel_ctx,
+				parser->patched_cb_size, false,
+				&patched_cb_handle);
 
 	if (rc) {
 		dev_err(hdev->dev,
@@ -4187,8 +4188,9 @@ static int gaudi_parse_cb_no_mmu(struct hl_device *hdev,
 	if (rc)
 		goto free_userptr;
 
-	rc = hl_cb_create(hdev, &hdev->kernel_cb_mgr, parser->patched_cb_size,
-			&patched_cb_handle, HL_KERNEL_ASID_ID, false);
+	rc = hl_cb_create(hdev, &hdev->kernel_cb_mgr, hdev->kernel_ctx,
+				parser->patched_cb_size, false,
+				&patched_cb_handle);
 	if (rc) {
 		dev_err(hdev->dev,
 			"Failed to allocate patched CB for DMA CS %d\n", rc);

drivers/misc/habanalabs/goya/goya.c

@@ -3810,8 +3810,9 @@ static int goya_parse_cb_mmu(struct hl_device *hdev,
 	parser->patched_cb_size = parser->user_cb_size +
 			sizeof(struct packet_msg_prot) * 2;
 
-	rc = hl_cb_create(hdev, &hdev->kernel_cb_mgr, parser->patched_cb_size,
-			&patched_cb_handle, HL_KERNEL_ASID_ID, false);
+	rc = hl_cb_create(hdev, &hdev->kernel_cb_mgr, hdev->kernel_ctx,
+				parser->patched_cb_size, false,
+				&patched_cb_handle);
 
 	if (rc) {
 		dev_err(hdev->dev,
@@ -3883,8 +3884,9 @@ static int goya_parse_cb_no_mmu(struct hl_device *hdev,
 	if (rc)
 		goto free_userptr;
 
-	rc = hl_cb_create(hdev, &hdev->kernel_cb_mgr, parser->patched_cb_size,
-			&patched_cb_handle, HL_KERNEL_ASID_ID, false);
+	rc = hl_cb_create(hdev, &hdev->kernel_cb_mgr, hdev->kernel_ctx,
+				parser->patched_cb_size, false,
+				&patched_cb_handle);
 	if (rc) {
 		dev_err(hdev->dev,
 			"Failed to allocate patched CB for DMA CS %d\n", rc);