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author | kaf24@scramble.cl.cam.ac.uk <kaf24@scramble.cl.cam.ac.uk> | 2004-06-17 16:33:27 +0000 |
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committer | kaf24@scramble.cl.cam.ac.uk <kaf24@scramble.cl.cam.ac.uk> | 2004-06-17 16:33:27 +0000 |
commit | 63fd330c2374df7a7b8fdf551b154b99d26dc484 (patch) | |
tree | 4414cdf56ba14ab03a65b31360d176daeb279fea /xen/drivers/pci | |
parent | a2829af0ba7eae188725e0d3cac58710cca71461 (diff) | |
download | xen-63fd330c2374df7a7b8fdf551b154b99d26dc484.tar.gz xen-63fd330c2374df7a7b8fdf551b154b99d26dc484.tar.bz2 xen-63fd330c2374df7a7b8fdf551b154b99d26dc484.zip |
bitkeeper revision 1.978.1.1 (40d1c7d75zjrViIOqn5JNXN1kGudig)
Remove dead function.
Diffstat (limited to 'xen/drivers/pci')
-rw-r--r-- | xen/drivers/pci/pci.c | 369 |
1 files changed, 2 insertions, 367 deletions
diff --git a/xen/drivers/pci/pci.c b/xen/drivers/pci/pci.c index 4f8c9e6963..c7dde554a1 100644 --- a/xen/drivers/pci/pci.c +++ b/xen/drivers/pci/pci.c @@ -290,10 +290,7 @@ pci_set_power_state(struct pci_dev *dev, int state) /* Mandatory power management transition delays */ /* see PCI PM 1.1 5.6.1 table 18 */ if(state == 3 || dev->current_state == 3) - { - set_current_state(TASK_UNINTERRUPTIBLE); - schedule_timeout(HZ/100); - } + mdelay(10); else if(state == 2 || dev->current_state == 2) udelay(200); dev->current_state = state; @@ -1673,359 +1670,7 @@ pci_pm_callback(struct pm_dev *pm_device, pm_request_t rqst, void *data) #endif - -#if 0 /* XXX KAF: Only USB uses this stuff -- I think we'll just bin it. */ - -/* - * Pool allocator ... wraps the pci_alloc_consistent page allocator, so - * small blocks are easily used by drivers for bus mastering controllers. - * This should probably be sharing the guts of the slab allocator. - */ - -struct pci_pool { /* the pool */ - struct list_head page_list; - spinlock_t lock; - size_t blocks_per_page; - size_t size; - int flags; - struct pci_dev *dev; - size_t allocation; - char name [32]; - wait_queue_head_t waitq; -}; - -struct pci_page { /* cacheable header for 'allocation' bytes */ - struct list_head page_list; - void *vaddr; - dma_addr_t dma; - unsigned long bitmap [0]; -}; - -#define POOL_TIMEOUT_JIFFIES ((100 /* msec */ * HZ) / 1000) -#define POOL_POISON_BYTE 0xa7 - -// #define CONFIG_PCIPOOL_DEBUG - - -/** - * pci_pool_create - Creates a pool of pci consistent memory blocks, for dma. - * @name: name of pool, for diagnostics - * @pdev: pci device that will be doing the DMA - * @size: size of the blocks in this pool. - * @align: alignment requirement for blocks; must be a power of two - * @allocation: returned blocks won't cross this boundary (or zero) - * @flags: SLAB_* flags (not all are supported). - * - * Returns a pci allocation pool with the requested characteristics, or - * null if one can't be created. Given one of these pools, pci_pool_alloc() - * may be used to allocate memory. Such memory will all have "consistent" - * DMA mappings, accessible by the device and its driver without using - * cache flushing primitives. The actual size of blocks allocated may be - * larger than requested because of alignment. - * - * If allocation is nonzero, objects returned from pci_pool_alloc() won't - * cross that size boundary. This is useful for devices which have - * addressing restrictions on individual DMA transfers, such as not crossing - * boundaries of 4KBytes. - */ -struct pci_pool * -pci_pool_create (const char *name, struct pci_dev *pdev, - size_t size, size_t align, size_t allocation, int flags) -{ - struct pci_pool *retval; - - if (align == 0) - align = 1; - if (size == 0) - return 0; - else if (size < align) - size = align; - else if ((size % align) != 0) { - size += align + 1; - size &= ~(align - 1); - } - - if (allocation == 0) { - if (PAGE_SIZE < size) - allocation = size; - else - allocation = PAGE_SIZE; - // FIXME: round up for less fragmentation - } else if (allocation < size) - return 0; - - if (!(retval = kmalloc (sizeof *retval, flags))) - return retval; - -#ifdef CONFIG_PCIPOOL_DEBUG - flags |= SLAB_POISON; -#endif - - strncpy (retval->name, name, sizeof retval->name); - retval->name [sizeof retval->name - 1] = 0; - - retval->dev = pdev; - INIT_LIST_HEAD (&retval->page_list); - spin_lock_init (&retval->lock); - retval->size = size; - retval->flags = flags; - retval->allocation = allocation; - retval->blocks_per_page = allocation / size; - init_waitqueue_head (&retval->waitq); - -#ifdef CONFIG_PCIPOOL_DEBUG - printk (KERN_DEBUG "pcipool create %s/%s size %d, %d/page (%d alloc)\n", - pdev ? pdev->slot_name : NULL, retval->name, size, - retval->blocks_per_page, allocation); -#endif - - return retval; -} - - -static struct pci_page * -pool_alloc_page (struct pci_pool *pool, int mem_flags) -{ - struct pci_page *page; - int mapsize; - - mapsize = pool->blocks_per_page; - mapsize = (mapsize + BITS_PER_LONG - 1) / BITS_PER_LONG; - mapsize *= sizeof (long); - - page = (struct pci_page *) kmalloc (mapsize + sizeof *page, mem_flags); - if (!page) - return 0; - page->vaddr = pci_alloc_consistent (pool->dev, - pool->allocation, - &page->dma); - if (page->vaddr) { - memset (page->bitmap, 0xff, mapsize); // bit set == free - if (pool->flags & SLAB_POISON) - memset (page->vaddr, POOL_POISON_BYTE, pool->allocation); - list_add (&page->page_list, &pool->page_list); - } else { - kfree (page); - page = 0; - } - return page; -} - - -static inline int -is_page_busy (int blocks, unsigned long *bitmap) -{ - while (blocks > 0) { - if (*bitmap++ != ~0UL) - return 1; - blocks -= BITS_PER_LONG; - } - return 0; -} - -static void -pool_free_page (struct pci_pool *pool, struct pci_page *page) -{ - dma_addr_t dma = page->dma; - - if (pool->flags & SLAB_POISON) - memset (page->vaddr, POOL_POISON_BYTE, pool->allocation); - pci_free_consistent (pool->dev, pool->allocation, page->vaddr, dma); - list_del (&page->page_list); - kfree (page); -} - - -/** - * pci_pool_destroy - destroys a pool of pci memory blocks. - * @pool: pci pool that will be destroyed - * - * Caller guarantees that no more memory from the pool is in use, - * and that nothing will try to use the pool after this call. - */ -void -pci_pool_destroy (struct pci_pool *pool) -{ - unsigned long flags; - -#ifdef CONFIG_PCIPOOL_DEBUG - printk (KERN_DEBUG "pcipool destroy %s/%s\n", - pool->dev ? pool->dev->slot_name : NULL, - pool->name); -#endif - - spin_lock_irqsave (&pool->lock, flags); - while (!list_empty (&pool->page_list)) { - struct pci_page *page; - page = list_entry (pool->page_list.next, - struct pci_page, page_list); - if (is_page_busy (pool->blocks_per_page, page->bitmap)) { - printk (KERN_ERR "pci_pool_destroy %s/%s, %p busy\n", - pool->dev ? pool->dev->slot_name : NULL, - pool->name, page->vaddr); - /* leak the still-in-use consistent memory */ - list_del (&page->page_list); - kfree (page); - } else - pool_free_page (pool, page); - } - spin_unlock_irqrestore (&pool->lock, flags); - kfree (pool); -} - - -/** - * pci_pool_alloc - get a block of consistent memory - * @pool: pci pool that will produce the block - * @mem_flags: SLAB_KERNEL or SLAB_ATOMIC - * @handle: pointer to dma address of block - * - * This returns the kernel virtual address of a currently unused block, - * and reports its dma address through the handle. - * If such a memory block can't be allocated, null is returned. - */ -void * -pci_pool_alloc (struct pci_pool *pool, int mem_flags, dma_addr_t *handle) -{ - unsigned long flags; - struct list_head *entry; - struct pci_page *page; - int map, block; - size_t offset; - void *retval; - -restart: - spin_lock_irqsave (&pool->lock, flags); - list_for_each (entry, &pool->page_list) { - int i; - page = list_entry (entry, struct pci_page, page_list); - /* only cachable accesses here ... */ - for (map = 0, i = 0; - i < pool->blocks_per_page; - i += BITS_PER_LONG, map++) { - if (page->bitmap [map] == 0) - continue; - block = ffz (~ page->bitmap [map]); - if ((i + block) < pool->blocks_per_page) { - clear_bit (block, &page->bitmap [map]); - offset = (BITS_PER_LONG * map) + block; - offset *= pool->size; - goto ready; - } - } - } - if (!(page = pool_alloc_page (pool, mem_flags))) { - if (mem_flags == SLAB_KERNEL) { - DECLARE_WAITQUEUE (wait, current); - - current->state = TASK_INTERRUPTIBLE; - add_wait_queue (&pool->waitq, &wait); - spin_unlock_irqrestore (&pool->lock, flags); - - schedule_timeout (POOL_TIMEOUT_JIFFIES); - - current->state = TASK_RUNNING; - remove_wait_queue (&pool->waitq, &wait); - goto restart; - } - retval = 0; - goto done; - } - - clear_bit (0, &page->bitmap [0]); - offset = 0; -ready: - retval = offset + page->vaddr; - *handle = offset + page->dma; -done: - spin_unlock_irqrestore (&pool->lock, flags); - return retval; -} - - -static struct pci_page * -pool_find_page (struct pci_pool *pool, dma_addr_t dma) -{ - unsigned long flags; - struct list_head *entry; - struct pci_page *page; - - spin_lock_irqsave (&pool->lock, flags); - list_for_each (entry, &pool->page_list) { - page = list_entry (entry, struct pci_page, page_list); - if (dma < page->dma) - continue; - if (dma < (page->dma + pool->allocation)) - goto done; - } - page = 0; -done: - spin_unlock_irqrestore (&pool->lock, flags); - return page; -} - - -/** - * pci_pool_free - put block back into pci pool - * @pool: the pci pool holding the block - * @vaddr: virtual address of block - * @dma: dma address of block - * - * Caller promises neither device nor driver will again touch this block - * unless it is first re-allocated. - */ -void -pci_pool_free (struct pci_pool *pool, void *vaddr, dma_addr_t dma) -{ - struct pci_page *page; - unsigned long flags; - int map, block; - - if ((page = pool_find_page (pool, dma)) == 0) { - printk (KERN_ERR "pci_pool_free %s/%s, %p/%x (bad dma)\n", - pool->dev ? pool->dev->slot_name : NULL, - pool->name, vaddr, (int) (dma & 0xffffffff)); - return; - } -#ifdef CONFIG_PCIPOOL_DEBUG - if (((dma - page->dma) + (void *)page->vaddr) != vaddr) { - printk (KERN_ERR "pci_pool_free %s/%s, %p (bad vaddr)/%x\n", - pool->dev ? pool->dev->slot_name : NULL, - pool->name, vaddr, (int) (dma & 0xffffffff)); - return; - } -#endif - - block = dma - page->dma; - block /= pool->size; - map = block / BITS_PER_LONG; - block %= BITS_PER_LONG; - -#ifdef CONFIG_PCIPOOL_DEBUG - if (page->bitmap [map] & (1UL << block)) { - printk (KERN_ERR "pci_pool_free %s/%s, dma %x already free\n", - pool->dev ? pool->dev->slot_name : NULL, - pool->name, dma); - return; - } -#endif - if (pool->flags & SLAB_POISON) - memset (vaddr, POOL_POISON_BYTE, pool->size); - - spin_lock_irqsave (&pool->lock, flags); - set_bit (block, &page->bitmap [map]); - if (waitqueue_active (&pool->waitq)) - wake_up (&pool->waitq); - /* - * Resist a temptation to do - * if (!is_page_busy(bpp, page->bitmap)) pool_free_page(pool, page); - * it is not interrupt safe. Better have empty pages hang around. - */ - spin_unlock_irqrestore (&pool->lock, flags); -} - -#endif /* XXX End of PCI pool allocator stuff. */ - +/* NB. Xen doesn't include the pool allocator. */ void __devinit pci_init(void) { @@ -2132,13 +1777,3 @@ EXPORT_SYMBOL(pcibios_find_device); EXPORT_SYMBOL(isa_dma_bridge_buggy); EXPORT_SYMBOL(pci_pci_problems); - -#if 0 -/* Pool allocator */ - -EXPORT_SYMBOL (pci_pool_create); -EXPORT_SYMBOL (pci_pool_destroy); -EXPORT_SYMBOL (pci_pool_alloc); -EXPORT_SYMBOL (pci_pool_free); - -#endif |