/* 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;
#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)
{
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
projects / xen.git / commitdiff