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staging: xillybus: Use devm_ API for memory allocation and DMA mapping
Managed device resource API replaces code that reinvents it for memory allocation, page allocation and DMA mapping. devm_add_action() is used for unwinding DMA mappings, since there is no devm_* API for dma_map_single(). A recent patch that introduces such API was rejected, mainly on the grounds that it may cause an unnecessary waste of resources. Suggested-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Eli Billauer <eli.billauer@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eli Billauer
Greg Kroah-Hartman
parent
31cd921dea
commit
525be905dc
@ -25,33 +25,12 @@
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struct xilly_endpoint_hardware;
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struct xilly_page {
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struct list_head node;
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unsigned long addr;
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unsigned int order;
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};
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struct xilly_dma {
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struct list_head node;
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struct pci_dev *pdev;
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struct device *dev;
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dma_addr_t dma_addr;
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size_t size;
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int direction;
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};
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struct xilly_buffer {
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void *addr;
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dma_addr_t dma_addr;
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int end_offset; /* Counting elements, not bytes */
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};
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struct xilly_cleanup {
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struct list_head to_kfree;
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struct list_head to_pagefree;
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struct list_head to_unmap;
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};
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struct xilly_idt_handle {
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unsigned char *chandesc;
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unsigned char *idt;
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@ -126,9 +105,6 @@ struct xilly_endpoint {
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struct mutex register_mutex;
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wait_queue_head_t ep_wait;
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/* List of memory allocations, to make release easy */
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struct xilly_cleanup cleanup;
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/* Channels and message handling */
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struct cdev cdev;
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@ -156,18 +132,22 @@ struct xilly_endpoint_hardware {
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dma_addr_t,
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size_t,
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int);
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dma_addr_t (*map_single)(struct xilly_cleanup *,
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struct xilly_endpoint *,
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void *,
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size_t,
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int);
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void (*unmap_single)(struct xilly_dma *entry);
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int (*map_single)(struct xilly_endpoint *,
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void *,
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size_t,
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int,
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dma_addr_t *);
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};
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irqreturn_t xillybus_isr(int irq, void *data);
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struct xilly_mapping {
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void *device;
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dma_addr_t dma_addr;
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size_t size;
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int direction;
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};
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void xillybus_do_cleanup(struct xilly_cleanup *mem,
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struct xilly_endpoint *endpoint);
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irqreturn_t xillybus_isr(int irq, void *data);
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struct xilly_endpoint *xillybus_init_endpoint(struct pci_dev *pdev,
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struct device *dev,
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@ -311,85 +311,14 @@ EXPORT_SYMBOL(xillybus_isr);
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* no locks are applied!
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*/
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void xillybus_do_cleanup(struct xilly_cleanup *mem,
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struct xilly_endpoint *endpoint)
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{
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struct list_head *this, *next;
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list_for_each_safe(this, next, &mem->to_unmap) {
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struct xilly_dma *entry =
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list_entry(this, struct xilly_dma, node);
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endpoint->ephw->unmap_single(entry);
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kfree(entry);
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}
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INIT_LIST_HEAD(&mem->to_unmap);
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list_for_each_safe(this, next, &mem->to_kfree)
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kfree(this);
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INIT_LIST_HEAD(&mem->to_kfree);
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list_for_each_safe(this, next, &mem->to_pagefree) {
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struct xilly_page *entry =
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list_entry(this, struct xilly_page, node);
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free_pages(entry->addr, entry->order);
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kfree(entry);
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}
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INIT_LIST_HEAD(&mem->to_pagefree);
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}
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EXPORT_SYMBOL(xillybus_do_cleanup);
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static void *xilly_malloc(struct xilly_cleanup *mem, size_t size)
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{
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void *ptr;
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ptr = kzalloc(sizeof(struct list_head) + size, GFP_KERNEL);
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if (!ptr)
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return ptr;
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list_add_tail((struct list_head *) ptr, &mem->to_kfree);
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return ptr + sizeof(struct list_head);
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}
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static unsigned long xilly_pagealloc(struct xilly_cleanup *mem,
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unsigned long order)
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{
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unsigned long addr;
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struct xilly_page *this;
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this = kmalloc(sizeof(struct xilly_page), GFP_KERNEL);
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if (!this)
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return 0;
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addr = __get_free_pages(GFP_KERNEL | __GFP_DMA32 | __GFP_ZERO, order);
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if (!addr) {
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kfree(this);
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return 0;
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}
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this->addr = addr;
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this->order = order;
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list_add_tail(&this->node, &mem->to_pagefree);
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return addr;
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}
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static void xillybus_autoflush(struct work_struct *work);
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static int xilly_setupchannels(struct xilly_endpoint *ep,
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struct xilly_cleanup *mem,
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unsigned char *chandesc,
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int entries
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)
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{
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struct device *dev = ep->dev;
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int i, entry, wr_nbuffer, rd_nbuffer;
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struct xilly_channel *channel;
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int channelnum, bufnum, bufsize, format, is_writebuf;
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@ -402,17 +331,20 @@ static int xilly_setupchannels(struct xilly_endpoint *ep,
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int left_of_rd_salami = 0;
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dma_addr_t dma_addr;
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int msg_buf_done = 0;
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const gfp_t gfp_mask = GFP_KERNEL | __GFP_DMA32 | __GFP_ZERO;
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struct xilly_buffer *this_buffer = NULL; /* Init to silence warning */
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int rc = 0;
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channel = xilly_malloc(mem, ep->num_channels *
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sizeof(struct xilly_channel));
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channel = devm_kzalloc(dev, ep->num_channels *
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sizeof(struct xilly_channel), GFP_KERNEL);
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if (!channel)
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goto memfail;
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ep->channels = xilly_malloc(mem, (ep->num_channels + 1) *
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sizeof(struct xilly_channel *));
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ep->channels = devm_kzalloc(dev, (ep->num_channels + 1) *
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sizeof(struct xilly_channel *),
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GFP_KERNEL);
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if (!ep->channels)
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goto memfail;
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@ -501,16 +433,16 @@ static int xilly_setupchannels(struct xilly_endpoint *ep,
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channel->rd_exclusive_open = exclusive_open;
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channel->seekable = seekable;
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channel->rd_buffers = xilly_malloc(
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mem,
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bufnum * sizeof(struct xilly_buffer *));
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channel->rd_buffers = devm_kzalloc(dev,
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bufnum * sizeof(struct xilly_buffer *),
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GFP_KERNEL);
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if (!channel->rd_buffers)
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goto memfail;
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this_buffer = xilly_malloc(
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mem,
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bufnum * sizeof(struct xilly_buffer));
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this_buffer = devm_kzalloc(dev,
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bufnum * sizeof(struct xilly_buffer),
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GFP_KERNEL);
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if (!this_buffer)
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goto memfail;
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@ -530,16 +462,16 @@ static int xilly_setupchannels(struct xilly_endpoint *ep,
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channel->wr_synchronous = synchronous;
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channel->wr_exclusive_open = exclusive_open;
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channel->wr_buffers = xilly_malloc(
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mem,
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bufnum * sizeof(struct xilly_buffer *));
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channel->wr_buffers = devm_kzalloc(dev,
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bufnum * sizeof(struct xilly_buffer *),
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GFP_KERNEL);
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if (!channel->wr_buffers)
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goto memfail;
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this_buffer = xilly_malloc(
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mem,
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bufnum * sizeof(struct xilly_buffer));
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this_buffer = devm_kzalloc(dev,
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bufnum * sizeof(struct xilly_buffer),
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GFP_KERNEL);
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if (!this_buffer)
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goto memfail;
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@ -576,21 +508,21 @@ static int xilly_setupchannels(struct xilly_endpoint *ep,
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}
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wr_salami = (void *)
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xilly_pagealloc(mem,
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allocorder);
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devm_get_free_pages(
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dev, gfp_mask,
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allocorder);
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if (!wr_salami)
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goto memfail;
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left_of_wr_salami = allocsize;
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}
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dma_addr = ep->ephw->map_single(
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mem,
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ep,
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wr_salami,
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bytebufsize,
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DMA_FROM_DEVICE);
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rc = ep->ephw->map_single(ep, wr_salami,
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bytebufsize,
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DMA_FROM_DEVICE,
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&dma_addr);
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if (!dma_addr)
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if (rc)
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goto dmafail;
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iowrite32(
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@ -654,8 +586,8 @@ static int xilly_setupchannels(struct xilly_endpoint *ep,
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}
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rd_salami = (void *)
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xilly_pagealloc(
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mem,
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devm_get_free_pages(
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dev, gfp_mask,
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allocorder);
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if (!rd_salami)
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@ -663,14 +595,13 @@ static int xilly_setupchannels(struct xilly_endpoint *ep,
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left_of_rd_salami = allocsize;
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}
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dma_addr = ep->ephw->map_single(
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mem,
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ep,
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rd_salami,
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bytebufsize,
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DMA_TO_DEVICE);
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if (!dma_addr)
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rc = ep->ephw->map_single(ep, rd_salami,
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bytebufsize,
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DMA_TO_DEVICE,
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&dma_addr);
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if (rc)
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goto dmafail;
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iowrite32(
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@ -712,7 +643,7 @@ memfail:
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return -ENOMEM;
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dmafail:
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dev_err(ep->dev, "Failed to map DMA memory!. Aborting.\n");
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return -ENOMEM;
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return rc;
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}
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static void xilly_scan_idt(struct xilly_endpoint *endpoint,
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@ -2103,9 +2034,6 @@ struct xilly_endpoint *xillybus_init_endpoint(struct pci_dev *pdev,
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endpoint->pdev = pdev;
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endpoint->dev = dev;
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endpoint->ephw = ephw;
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INIT_LIST_HEAD(&endpoint->cleanup.to_kfree);
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INIT_LIST_HEAD(&endpoint->cleanup.to_pagefree);
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INIT_LIST_HEAD(&endpoint->cleanup.to_unmap);
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endpoint->msg_counter = 0x0b;
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endpoint->failed_messages = 0;
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endpoint->fatal_error = 0;
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@ -2131,7 +2059,7 @@ static int xilly_quiesce(struct xilly_endpoint *endpoint)
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if (endpoint->idtlen < 0) {
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dev_err(endpoint->dev,
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"Failed to quiesce the device on exit. Quitting while leaving a mess.\n");
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"Failed to quiesce the device on exit.\n");
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return -ENODEV;
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}
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return 0; /* Success */
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@ -2141,8 +2069,9 @@ int xillybus_endpoint_discovery(struct xilly_endpoint *endpoint)
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{
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int rc = 0;
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struct xilly_cleanup tmpmem;
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void *bootstrap_resources;
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int idtbuffersize = (1 << PAGE_SHIFT);
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struct device *dev = endpoint->dev;
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/*
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* The bogus IDT is used during bootstrap for allocating the initial
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@ -2155,10 +2084,6 @@ int xillybus_endpoint_discovery(struct xilly_endpoint *endpoint)
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3, 192, PAGE_SHIFT, 0 };
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struct xilly_idt_handle idt_handle;
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INIT_LIST_HEAD(&tmpmem.to_kfree);
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INIT_LIST_HEAD(&tmpmem.to_pagefree);
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INIT_LIST_HEAD(&tmpmem.to_unmap);
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/*
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* Writing the value 0x00000001 to Endianness register signals which
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* endianness this processor is using, so the FPGA can swap words as
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@ -2170,12 +2095,16 @@ int xillybus_endpoint_discovery(struct xilly_endpoint *endpoint)
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/* Bootstrap phase I: Allocate temporary message buffer */
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bootstrap_resources = devres_open_group(dev, NULL, GFP_KERNEL);
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if (!bootstrap_resources)
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return -ENOMEM;
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endpoint->num_channels = 0;
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rc = xilly_setupchannels(endpoint, &tmpmem, bogus_idt, 1);
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rc = xilly_setupchannels(endpoint, bogus_idt, 1);
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if (rc)
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goto failed_buffers;
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return rc;
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/* Clear the message subsystem (and counter in particular) */
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iowrite32(0x04, &endpoint->registers[fpga_msg_ctrl_reg]);
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@ -2199,8 +2128,7 @@ int xillybus_endpoint_discovery(struct xilly_endpoint *endpoint)
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if (endpoint->idtlen < 0) {
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dev_err(endpoint->dev, "No response from FPGA. Aborting.\n");
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rc = -ENODEV;
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goto failed_quiesce;
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return -ENODEV;
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}
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/* Enable DMA */
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@ -2216,7 +2144,7 @@ int xillybus_endpoint_discovery(struct xilly_endpoint *endpoint)
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endpoint->num_channels = 1;
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rc = xilly_setupchannels(endpoint, &tmpmem, bogus_idt, 2);
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rc = xilly_setupchannels(endpoint, bogus_idt, 2);
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if (rc)
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goto failed_idt;
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@ -2234,10 +2162,12 @@ int xillybus_endpoint_discovery(struct xilly_endpoint *endpoint)
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rc = -ENODEV;
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goto failed_idt;
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}
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devres_close_group(dev, bootstrap_resources);
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/* Bootstrap phase III: Allocate buffers according to IDT */
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rc = xilly_setupchannels(endpoint,
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&endpoint->cleanup,
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idt_handle.chandesc,
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idt_handle.entries);
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@ -2260,7 +2190,7 @@ int xillybus_endpoint_discovery(struct xilly_endpoint *endpoint)
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if (rc)
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goto failed_chrdevs;
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xillybus_do_cleanup(&tmpmem, endpoint);
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devres_release_group(dev, bootstrap_resources);
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return 0;
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@ -2270,16 +2200,8 @@ failed_chrdevs:
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mutex_unlock(&ep_list_lock);
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failed_idt:
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/* Quiesce the device. Now it's serious to do it */
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rc = xilly_quiesce(endpoint);
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if (rc)
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return rc; /* FPGA may still DMA, so no release */
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xilly_quiesce(endpoint);
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flush_workqueue(xillybus_wq);
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failed_quiesce:
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failed_buffers:
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xillybus_do_cleanup(&tmpmem, endpoint);
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return rc;
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}
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@ -62,44 +62,53 @@ static void xilly_dma_sync_single_nop(struct xilly_endpoint *ep,
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{
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}
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static dma_addr_t xilly_map_single_of(struct xilly_cleanup *mem,
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struct xilly_endpoint *ep,
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void *ptr,
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size_t size,
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int direction
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static void xilly_of_unmap(void *ptr)
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{
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struct xilly_mapping *data = ptr;
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dma_unmap_single(data->device, data->dma_addr,
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data->size, data->direction);
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kfree(ptr);
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}
|
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static int xilly_map_single_of(struct xilly_endpoint *ep,
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void *ptr,
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size_t size,
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int direction,
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dma_addr_t *ret_dma_handle
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)
|
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{
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dma_addr_t addr;
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struct xilly_mapping *this;
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int rc;
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dma_addr_t addr = 0;
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struct xilly_dma *this;
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this = kmalloc(sizeof(struct xilly_dma), GFP_KERNEL);
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this = kzalloc(sizeof(*this), GFP_KERNEL);
|
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if (!this)
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return 0;
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return -ENOMEM;
|
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|
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addr = dma_map_single(ep->dev, ptr, size, direction);
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this->direction = direction;
|
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if (dma_mapping_error(ep->dev, addr)) {
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kfree(this);
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return 0;
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return -ENODEV;
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}
|
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|
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this->device = ep->dev;
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this->dma_addr = addr;
|
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this->dev = ep->dev;
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this->size = size;
|
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this->direction = direction;
|
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list_add_tail(&this->node, &mem->to_unmap);
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*ret_dma_handle = addr;
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return addr;
|
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}
|
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rc = devm_add_action(ep->dev, xilly_of_unmap, this);
|
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static void xilly_unmap_single_of(struct xilly_dma *entry)
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{
|
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dma_unmap_single(entry->dev,
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entry->dma_addr,
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entry->size,
|
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entry->direction);
|
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if (rc) {
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dma_unmap_single(ep->dev, addr, size, direction);
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kfree(this);
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}
|
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return rc;
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}
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||||
|
||||
static struct xilly_endpoint_hardware of_hw = {
|
||||
@ -107,7 +116,6 @@ static struct xilly_endpoint_hardware of_hw = {
|
||||
.hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of,
|
||||
.hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of,
|
||||
.map_single = xilly_map_single_of,
|
||||
.unmap_single = xilly_unmap_single_of
|
||||
};
|
||||
|
||||
static struct xilly_endpoint_hardware of_hw_coherent = {
|
||||
@ -115,7 +123,6 @@ static struct xilly_endpoint_hardware of_hw_coherent = {
|
||||
.hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop,
|
||||
.hw_sync_sgl_for_device = xilly_dma_sync_single_nop,
|
||||
.map_single = xilly_map_single_of,
|
||||
.unmap_single = xilly_unmap_single_of
|
||||
};
|
||||
|
||||
static int xilly_drv_probe(struct platform_device *op)
|
||||
@ -138,12 +145,6 @@ static int xilly_drv_probe(struct platform_device *op)
|
||||
dev_set_drvdata(dev, endpoint);
|
||||
|
||||
rc = of_address_to_resource(dev->of_node, 0, &res);
|
||||
if (rc) {
|
||||
dev_warn(endpoint->dev,
|
||||
"Failed to obtain device tree resource\n");
|
||||
return rc;
|
||||
}
|
||||
|
||||
endpoint->registers = devm_ioremap_resource(dev, &res);
|
||||
|
||||
if (IS_ERR(endpoint->registers))
|
||||
@ -159,14 +160,7 @@ static int xilly_drv_probe(struct platform_device *op)
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
rc = xillybus_endpoint_discovery(endpoint);
|
||||
|
||||
if (!rc)
|
||||
return 0;
|
||||
|
||||
xillybus_do_cleanup(&endpoint->cleanup, endpoint);
|
||||
|
||||
return rc;
|
||||
return xillybus_endpoint_discovery(endpoint);
|
||||
}
|
||||
|
||||
static int xilly_drv_remove(struct platform_device *op)
|
||||
@ -176,8 +170,6 @@ static int xilly_drv_remove(struct platform_device *op)
|
||||
|
||||
xillybus_endpoint_remove(endpoint);
|
||||
|
||||
xillybus_do_cleanup(&endpoint->cleanup, endpoint);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
@ -72,52 +72,62 @@ static void xilly_dma_sync_single_for_device_pci(struct xilly_endpoint *ep,
|
||||
xilly_pci_direction(direction));
|
||||
}
|
||||
|
||||
static void xilly_pci_unmap(void *ptr)
|
||||
{
|
||||
struct xilly_mapping *data = ptr;
|
||||
|
||||
pci_unmap_single(data->device, data->dma_addr,
|
||||
data->size, data->direction);
|
||||
|
||||
kfree(ptr);
|
||||
}
|
||||
|
||||
/*
|
||||
* Map either through the PCI DMA mapper or the non_PCI one. Behind the
|
||||
* scenes exactly the same functions are called with the same parameters,
|
||||
* but that can change.
|
||||
*/
|
||||
|
||||
static dma_addr_t xilly_map_single_pci(struct xilly_cleanup *mem,
|
||||
struct xilly_endpoint *ep,
|
||||
void *ptr,
|
||||
size_t size,
|
||||
int direction
|
||||
static int xilly_map_single_pci(struct xilly_endpoint *ep,
|
||||
void *ptr,
|
||||
size_t size,
|
||||
int direction,
|
||||
dma_addr_t *ret_dma_handle
|
||||
)
|
||||
{
|
||||
|
||||
dma_addr_t addr = 0;
|
||||
struct xilly_dma *this;
|
||||
int pci_direction;
|
||||
dma_addr_t addr;
|
||||
struct xilly_mapping *this;
|
||||
int rc = 0;
|
||||
|
||||
this = kmalloc(sizeof(struct xilly_dma), GFP_KERNEL);
|
||||
this = kzalloc(sizeof(*this), GFP_KERNEL);
|
||||
if (!this)
|
||||
return 0;
|
||||
return -ENOMEM;
|
||||
|
||||
pci_direction = xilly_pci_direction(direction);
|
||||
|
||||
addr = pci_map_single(ep->pdev, ptr, size, pci_direction);
|
||||
this->direction = pci_direction;
|
||||
|
||||
if (pci_dma_mapping_error(ep->pdev, addr)) {
|
||||
kfree(this);
|
||||
return 0;
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
this->device = ep->pdev;
|
||||
this->dma_addr = addr;
|
||||
this->pdev = ep->pdev;
|
||||
this->size = size;
|
||||
this->direction = pci_direction;
|
||||
|
||||
list_add_tail(&this->node, &mem->to_unmap);
|
||||
*ret_dma_handle = addr;
|
||||
|
||||
return addr;
|
||||
}
|
||||
rc = devm_add_action(ep->dev, xilly_pci_unmap, this);
|
||||
|
||||
static void xilly_unmap_single_pci(struct xilly_dma *entry)
|
||||
{
|
||||
pci_unmap_single(entry->pdev,
|
||||
entry->dma_addr,
|
||||
entry->size,
|
||||
entry->direction);
|
||||
if (rc) {
|
||||
pci_unmap_single(ep->pdev, addr, size, pci_direction);
|
||||
kfree(this);
|
||||
}
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static struct xilly_endpoint_hardware pci_hw = {
|
||||
@ -125,7 +135,6 @@ static struct xilly_endpoint_hardware pci_hw = {
|
||||
.hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_pci,
|
||||
.hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_pci,
|
||||
.map_single = xilly_map_single_pci,
|
||||
.unmap_single = xilly_unmap_single_pci
|
||||
};
|
||||
|
||||
static int xilly_probe(struct pci_dev *pdev,
|
||||
@ -199,14 +208,7 @@ static int xilly_probe(struct pci_dev *pdev,
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
rc = xillybus_endpoint_discovery(endpoint);
|
||||
|
||||
if (!rc)
|
||||
return 0;
|
||||
|
||||
xillybus_do_cleanup(&endpoint->cleanup, endpoint);
|
||||
|
||||
return rc;
|
||||
return xillybus_endpoint_discovery(endpoint);
|
||||
}
|
||||
|
||||
static void xilly_remove(struct pci_dev *pdev)
|
||||
@ -214,8 +216,6 @@ static void xilly_remove(struct pci_dev *pdev)
|
||||
struct xilly_endpoint *endpoint = pci_get_drvdata(pdev);
|
||||
|
||||
xillybus_endpoint_remove(endpoint);
|
||||
|
||||
xillybus_do_cleanup(&endpoint->cleanup, endpoint);
|
||||
}
|
||||
|
||||
MODULE_DEVICE_TABLE(pci, xillyids);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user