C++ dma_pool_destroy函数代码示例

static void ehci_mem_cleanup (struct ehci_hcd *ehci)
{
	if (ehci->async)
		qh_destroy(ehci, ehci->async);
	ehci->async = NULL;

	if (ehci->dummy)
		qh_destroy(ehci, ehci->dummy);
	ehci->dummy = NULL;

	/* DMA consistent memory and pools */
	dma_pool_destroy(ehci->qtd_pool);
	ehci->qtd_pool = NULL;
	dma_pool_destroy(ehci->qh_pool);
	ehci->qh_pool = NULL;
	dma_pool_destroy(ehci->itd_pool);
	ehci->itd_pool = NULL;
	dma_pool_destroy(ehci->sitd_pool);
	ehci->sitd_pool = NULL;

	if (ehci->periodic)
		dma_free_coherent(ehci_to_hcd(ehci)->self.sysdev,
			ehci->periodic_size * sizeof (u32),
			ehci->periodic, ehci->periodic_dma);
	ehci->periodic = NULL;

	/* shadow periodic table */
	kfree(ehci->pshadow);
	ehci->pshadow = NULL;
}

void dmabounce_unregister_dev(struct device *dev)
{
	struct dmabounce_device_info *device_info = dev->archdata.dmabounce;

	dev->archdata.dmabounce = NULL;

	if (!device_info) {
		dev_warn(dev,
			 "Never registered with dmabounce but attempting"
			 "to unregister!\n");
		return;
	}

	if (!list_empty(&device_info->safe_buffers)) {
		dev_err(dev,
			"Removing from dmabounce with pending buffers!\n");
		BUG();
	}

	if (device_info->small.pool)
		dma_pool_destroy(device_info->small.pool);
	if (device_info->large.pool)
		dma_pool_destroy(device_info->large.pool);

#ifdef STATS
	if (device_info->attr_res == 0)
		device_remove_file(dev, &dev_attr_dmabounce_stats);
#endif

	kfree(device_info);

	dev_info(dev, "dmabounce: device unregistered\n");
}

static void ehci_mem_cleanup (struct ehci_hcd *ehci)
{
	free_cached_lists(ehci);
	if (ehci->async)
		qh_put (ehci->async);
	ehci->async = NULL;

	/* DMA consistent memory and pools */
	if (ehci->qtd_pool)
		dma_pool_destroy (ehci->qtd_pool);
	ehci->qtd_pool = NULL;

	if (ehci->qh_pool) {
		dma_pool_destroy (ehci->qh_pool);
		ehci->qh_pool = NULL;
	}

	if (ehci->itd_pool)
		dma_pool_destroy (ehci->itd_pool);
	ehci->itd_pool = NULL;

	if (ehci->sitd_pool)
		dma_pool_destroy (ehci->sitd_pool);
	ehci->sitd_pool = NULL;

	if (ehci->periodic)
		dma_free_coherent (ehci_to_hcd(ehci)->self.controller,
			ehci->periodic_size * sizeof (u32),
			ehci->periodic, ehci->periodic_dma);
	ehci->periodic = NULL;

	/* shadow periodic table */
	kfree(ehci->pshadow);
	ehci->pshadow = NULL;
}

static void ohci_mem_cleanup (struct ohci_hcd *ohci)
{
	if (ohci->td_cache) {
		dma_pool_destroy (ohci->td_cache);
		ohci->td_cache = 0;
	}
	if (ohci->ed_cache) {
		dma_pool_destroy (ohci->ed_cache);
		ohci->ed_cache = 0;
	}
}

/**
 * @brief  Initialize & alloc RX buffer
 * @details This function executes;\n
 *          # Create DMA pool\n
 *          # Alloc RX buffer\n
 *          # Call RX buffer clear
 * @param  N/A
 * @retval 0 : Success
 * @retval -ENOMEM : Error, no enough memory.
 * @note
 */
int felica_rxbuf_init(void)
{
	int i;

	pr_debug(PRT_NAME ": %s\n", __func__);

	rxbuf.dmapool = dma_pool_create(DMAPOOL_NAME, NULL, DMAPOOL_SIZE,
					DMAPOOL_ALIGN, DMAPOOL_ALIGN * RXBUF_N);
	if (!rxbuf.dmapool) {
		pr_err(PRT_NAME ": Error. Cannot create DMA pool for RXbuf.");
		return -ENOMEM;
	}
	for (i = 0; i < RXBUF_N; i++) {
		rxbuf.slot[i].buf = dma_pool_alloc(rxbuf.dmapool, GFP_KERNEL,
						&rxbuf.slot[i].dmabase);
		if (!rxbuf.slot[i].buf) {
			pr_err(PRT_NAME
			    ": Error. No enough mem for RXbuf.\n");
			goto err_alloc_rx_buf;
		}
	}

	felica_rxbuf_clear();

	return 0;

err_alloc_rx_buf:
	for (i--; i >= 0; i--) {
		dma_pool_free(rxbuf.dmapool, rxbuf.slot[i].buf,
					rxbuf.slot[i].dmabase);
	}
	dma_pool_destroy(rxbuf.dmapool);
	rxbuf.dmapool = NULL;
	return -ENOMEM;
}

int
dmabounce_register_dev(struct device *dev, unsigned long small_buffer_size,
			unsigned long large_buffer_size)
{
	struct dmabounce_device_info *device_info;
	int ret;

	device_info = kmalloc(sizeof(struct dmabounce_device_info), GFP_ATOMIC);
	if (!device_info) {
		printk(KERN_ERR
			"Could not allocated dmabounce_device_info for %s",
			dev->bus_id);
		return -ENOMEM;
	}

	ret = dmabounce_init_pool(&device_info->small, dev,
				  "small_dmabounce_pool", small_buffer_size);
	if (ret) {
		dev_err(dev,
			"dmabounce: could not allocate DMA pool for %ld byte objects\n",
			small_buffer_size);
		goto err_free;
	}

	if (large_buffer_size) {
		ret = dmabounce_init_pool(&device_info->large, dev,
					  "large_dmabounce_pool",
					  large_buffer_size);
		if (ret) {
			dev_err(dev,
				"dmabounce: could not allocate DMA pool for %ld byte objects\n",
				large_buffer_size);
			goto err_destroy;
		}
	}

	device_info->dev = dev;
	INIT_LIST_HEAD(&device_info->safe_buffers);
	rwlock_init(&device_info->lock);

#ifdef STATS
	device_info->total_allocs = 0;
	device_info->map_op_count = 0;
	device_info->bounce_count = 0;
	device_info->attr_res = device_create_file(dev, &dev_attr_dmabounce_stats);
#endif

	dev->archdata.dmabounce = device_info;

	printk(KERN_INFO "dmabounce: registered device %s on %s bus\n",
		dev->bus_id, dev->bus->name);

	return 0;

 err_destroy:
	dma_pool_destroy(device_info->small.pool);
 err_free:
	kfree(device_info);
	return ret;
}

void whc_clean_up(struct whc *whc)
{
	resource_size_t len;

	if (whc->di_buf)
		dma_free_coherent(&whc->umc->dev, sizeof(struct di_buf_entry) * whc->n_devices,
				  whc->di_buf, whc->di_buf_dma);
	if (whc->dn_buf)
		dma_free_coherent(&whc->umc->dev, sizeof(struct dn_buf_entry) * WHC_N_DN_ENTRIES,
				  whc->dn_buf, whc->dn_buf_dma);
	if (whc->gen_cmd_buf)
		dma_free_coherent(&whc->umc->dev, WHC_GEN_CMD_DATA_LEN,
				  whc->gen_cmd_buf, whc->gen_cmd_buf_dma);

	pzl_clean_up(whc);
	asl_clean_up(whc);

	dma_pool_destroy(whc->qset_pool);

	len   = resource_size(&whc->umc->resource);
	if (whc->base)
		iounmap(whc->base);
	if (whc->base_phys)
		release_mem_region(whc->base_phys, len);

	if (whc->workqueue)
		destroy_workqueue(whc->workqueue);
}

int dmabounce_register_dev(struct device *dev, unsigned long small_buffer_size,
		unsigned long large_buffer_size,
		int (*needs_bounce_fn)(struct device *, dma_addr_t, size_t))
{
	struct dmabounce_device_info *device_info;
	int ret;

	device_info = kmalloc(sizeof(struct dmabounce_device_info), GFP_ATOMIC);
	if (!device_info) {
		dev_err(dev,
			"Could not allocated dmabounce_device_info\n");
		return -ENOMEM;
	}

	ret = dmabounce_init_pool(&device_info->small, dev,
				  "small_dmabounce_pool", small_buffer_size);
	if (ret) {
		dev_err(dev,
			"dmabounce: could not allocate DMA pool for %ld byte objects\n",
			small_buffer_size);
		goto err_free;
	}

	if (large_buffer_size) {
		ret = dmabounce_init_pool(&device_info->large, dev,
					  "large_dmabounce_pool",
					  large_buffer_size);
		if (ret) {
			dev_err(dev,
				"dmabounce: could not allocate DMA pool for %ld byte objects\n",
				large_buffer_size);
			goto err_destroy;
		}
	}

	device_info->dev = dev;
	INIT_LIST_HEAD(&device_info->safe_buffers);
	rwlock_init(&device_info->lock);
	device_info->needs_bounce = needs_bounce_fn;

#ifdef STATS
	device_info->total_allocs = 0;
	device_info->map_op_count = 0;
	device_info->bounce_count = 0;
	device_info->attr_res = device_create_file(dev, &dev_attr_dmabounce_stats);
#endif

	dev->archdata.dmabounce = device_info;
	set_dma_ops(dev, &dmabounce_ops);

	dev_info(dev, "dmabounce: registered device\n");

	return 0;

 err_destroy:
	dma_pool_destroy(device_info->small.pool);
 err_free:
	kfree(device_info);
	return ret;
}

static int __init my_init(void)
{

	/* dma_alloc_coherent method */

	printk(KERN_INFO "Loading DMA allocation test module\n");
	printk(KERN_INFO "\nTesting dma_alloc_coherent()..........\n\n");
	kbuf = dma_alloc_coherent(NULL, size, &handle, GFP_KERNEL);
	output(kbuf, handle, size, "This is the dma_alloc_coherent() string");
	dma_free_coherent(NULL, size, kbuf, handle);

	/* dma_map/unmap_single */

	printk(KERN_INFO "\nTesting dma_map_single()................\n\n");
	kbuf = kmalloc(size, GFP_KERNEL);
	handle = dma_map_single(NULL, kbuf, size, direction);
	output(kbuf, handle, size, "This is the dma_map_single() string");
	dma_unmap_single(NULL, handle, size, direction);
	kfree(kbuf);

	/* dma_pool method */

	printk(KERN_INFO "\nTesting dma_pool_alloc()..........\n\n");
	mypool = dma_pool_create("mypool", NULL, pool_size, pool_align, 0);
	kbuf = dma_pool_alloc(mypool, GFP_KERNEL, &handle);
	output(kbuf, handle, size, "This is the dma_pool_alloc() string");
	dma_pool_free(mypool, kbuf, handle);
	dma_pool_destroy(mypool);

	return 0;
}

static void destroy_hdlc_queues(struct port *port)
{
	int i;

	if (port->desc_tab) {
		for (i = 0; i < RX_DESCS; i++) {
			struct desc *desc = rx_desc_ptr(port, i);
			buffer_t *buff = port->rx_buff_tab[i];
			if (buff) {
				dma_unmap_single(&port->netdev->dev,
						 desc->data, RX_SIZE,
						 DMA_FROM_DEVICE);
				free_buffer(buff);
			}
		}
		for (i = 0; i < TX_DESCS; i++) {
			struct desc *desc = tx_desc_ptr(port, i);
			buffer_t *buff = port->tx_buff_tab[i];
			if (buff) {
				dma_unmap_tx(port, desc);
				free_buffer(buff);
			}
		}
		dma_pool_free(dma_pool, port->desc_tab, port->desc_tab_phys);
		port->desc_tab = NULL;
	}

	if (!ports_open && dma_pool) {
		dma_pool_destroy(dma_pool);
		dma_pool = NULL;
	}
}

static int __init my_init(void)
{

        printk(KERN_INFO "Satish testing DMA module");

        printk(KERN_INFO "testing DMA coherent mapping dma_alloc_coherent()");
        kbuf = dma_alloc_coherent(NULL, size, &handle, GFP_KERNEL);
        output(kbuf, handle, size, "dma_alloc_coherent string");
        dma_free_coherent(NULL, size, kbuf, handle);


        printk(KERN_INFO "Testing DMA Mapping dma_map_page()");
        kbuf = kmalloc(size, GFP_KERNEL);
        handle = dma_map_single(NULL, size, &handle, GFP_KERNEL);
        output(kbuf, handle, size, "this is dma_map_single string");
        dma_unmap_single(NULL, handle, size, direction);
        kfree(kbuf);


        printk(KERN_INFO "Testing DMA Pool method");
        mypool = dma_pool_create("mypool", NULL, pool_size, pool_align, 0);
        kbuf = dma_pool_alloc(mypool, GFP_KERNEL, &handle);
        output(kbuf, handle, size, "This is dma_pool_alloc string");
        dma_pool_free(mypool, kbuf, handle);
        dma_pool_destroy(mypool);

        return 0;
}

void ath10k_htt_tx_free(struct ath10k_htt *htt)
{
	ath10k_htt_tx_free_pending(htt);
	kfree(htt->pending_tx);
	kfree(htt->used_msdu_ids);
	dma_pool_destroy(htt->tx_pool);
}

static void destroy_crypto_dma_pool(struct nitrox_device *ndev)
{
	if (!ndev->ctx_pool)
		return;

	dma_pool_destroy(ndev->ctx_pool);
	ndev->ctx_pool = NULL;
}

void ath10k_htt_tx_detach(struct ath10k_htt *htt)
{
	ath10k_htt_tx_cleanup_pending(htt);
	kfree(htt->pending_tx);
	kfree(htt->used_msdu_ids);
	dma_pool_destroy(htt->tx_pool);
	return;
}

/**
 * beiscsi_session_destroy - destroys iscsi session
 * @cls_session:	pointer to iscsi cls session
 *
 * Destroys iSCSI session instance and releases
 * resources allocated for it.
 */
void beiscsi_session_destroy(struct iscsi_cls_session *cls_session)
{
	struct iscsi_session *sess = cls_session->dd_data;
	struct beiscsi_session *beiscsi_sess = sess->dd_data;

	printk(KERN_INFO "In beiscsi_session_destroy\n");
	dma_pool_destroy(beiscsi_sess->bhs_pool);
	iscsi_session_teardown(cls_session);
}