Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 663 insertions, 0 deletions

diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
new file mode 100644
index 00000000000..344a83fd7c2
--- /dev/null
+++ b/sound/core/memalloc.c
@@ -0,0 +1,663 @@
+/*
+ *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
+ *                   Takashi Iwai <tiwai@suse.de>
+ * 
+ *  Generic memory allocators
+ *
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <linux/moduleparam.h>
+#include <asm/semaphore.h>
+#include <sound/memalloc.h>
+#ifdef CONFIG_SBUS
+#include <asm/sbus.h>
+#endif
+
+
+MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@suse.cz>");
+MODULE_DESCRIPTION("Memory allocator for ALSA system.");
+MODULE_LICENSE("GPL");
+
+
+#ifndef SNDRV_CARDS
+#define SNDRV_CARDS	8
+#endif
+
+/* FIXME: so far only some PCI devices have the preallocation table */
+#ifdef CONFIG_PCI
+static int enable[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(enable, "Enable cards to allocate buffers.");
+#endif
+
+/*
+ */
+
+void *snd_malloc_sgbuf_pages(struct device *device,
+                             size_t size, struct snd_dma_buffer *dmab,
+			     size_t *res_size);
+int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
+
+/*
+ */
+
+static DECLARE_MUTEX(list_mutex);
+static LIST_HEAD(mem_list_head);
+
+/* buffer preservation list */
+struct snd_mem_list {
+	struct snd_dma_buffer buffer;
+	unsigned int id;
+	struct list_head list;
+};
+
+/* id for pre-allocated buffers */
+#define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1
+
+#ifdef CONFIG_SND_DEBUG
+#define __ASTRING__(x) #x
+#define snd_assert(expr, args...) do {\
+	if (!(expr)) {\
+		printk(KERN_ERR "snd-malloc: BUG? (%s) (called from %p)\n", __ASTRING__(expr), __builtin_return_address(0));\
+		args;\
+	}\
+} while (0)
+#else
+#define snd_assert(expr, args...) /**/
+#endif
+
+/*
+ *  Hacks
+ */
+
+#if defined(__i386__) || defined(__ppc__) || defined(__x86_64__)
+/*
+ * A hack to allocate large buffers via dma_alloc_coherent()
+ *
+ * since dma_alloc_coherent always tries GFP_DMA when the requested
+ * pci memory region is below 32bit, it happens quite often that even
+ * 2 order of pages cannot be allocated.
+ *
+ * so in the following, we allocate at first without dma_mask, so that
+ * allocation will be done without GFP_DMA.  if the area doesn't match
+ * with the requested region, then realloate with the original dma_mask
+ * again.
+ *
+ * Really, we want to move this type of thing into dma_alloc_coherent()
+ * so dma_mask doesn't have to be messed with.
+ */
+
+static void *snd_dma_hack_alloc_coherent(struct device *dev, size_t size,
+					 dma_addr_t *dma_handle, int flags)
+{
+	void *ret;
+	u64 dma_mask, coherent_dma_mask;
+
+	if (dev == NULL || !dev->dma_mask)
+		return dma_alloc_coherent(dev, size, dma_handle, flags);
+	dma_mask = *dev->dma_mask;
+	coherent_dma_mask = dev->coherent_dma_mask;
+	*dev->dma_mask = 0xffffffff; 	/* do without masking */
+	dev->coherent_dma_mask = 0xffffffff; 	/* do without masking */
+	ret = dma_alloc_coherent(dev, size, dma_handle, flags);
+	*dev->dma_mask = dma_mask;	/* restore */
+	dev->coherent_dma_mask = coherent_dma_mask;	/* restore */
+	if (ret) {
+		/* obtained address is out of range? */
+		if (((unsigned long)*dma_handle + size - 1) & ~dma_mask) {
+			/* reallocate with the proper mask */
+			dma_free_coherent(dev, size, ret, *dma_handle);
+			ret = dma_alloc_coherent(dev, size, dma_handle, flags);
+		}
+	} else {
+		/* wish to success now with the proper mask... */
+		if (dma_mask != 0xffffffffUL) {
+			/* allocation with GFP_ATOMIC to avoid the long stall */
+			flags &= ~GFP_KERNEL;
+			flags |= GFP_ATOMIC;
+			ret = dma_alloc_coherent(dev, size, dma_handle, flags);
+		}
+	}
+	return ret;
+}
+
+/* redefine dma_alloc_coherent for some architectures */
+#undef dma_alloc_coherent
+#define dma_alloc_coherent snd_dma_hack_alloc_coherent
+
+#endif /* arch */
+
+#if ! defined(__arm__)
+#define NEED_RESERVE_PAGES
+#endif
+
+/*
+ *
+ *  Generic memory allocators
+ *
+ */
+
+static long snd_allocated_pages; /* holding the number of allocated pages */
+
+static inline void inc_snd_pages(int order)
+{
+	snd_allocated_pages += 1 << order;
+}
+
+static inline void dec_snd_pages(int order)
+{
+	snd_allocated_pages -= 1 << order;
+}
+
+static void mark_pages(struct page *page, int order)
+{
+	struct page *last_page = page + (1 << order);
+	while (page < last_page)
+		SetPageReserved(page++);
+}
+
+static void unmark_pages(struct page *page, int order)
+{
+	struct page *last_page = page + (1 << order);
+	while (page < last_page)
+		ClearPageReserved(page++);
+}
+
+/**
+ * snd_malloc_pages - allocate pages with the given size
+ * @size: the size to allocate in bytes
+ * @gfp_flags: the allocation conditions, GFP_XXX
+ *
+ * Allocates the physically contiguous pages with the given size.
+ *
+ * Returns the pointer of the buffer, or NULL if no enoguh memory.
+ */
+void *snd_malloc_pages(size_t size, unsigned int gfp_flags)
+{
+	int pg;
+	void *res;
+
+	snd_assert(size > 0, return NULL);
+	snd_assert(gfp_flags != 0, return NULL);
+	pg = get_order(size);
+	if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL) {
+		mark_pages(virt_to_page(res), pg);
+		inc_snd_pages(pg);
+	}
+	return res;
+}
+
+/**
+ * snd_free_pages - release the pages
+ * @ptr: the buffer pointer to release
+ * @size: the allocated buffer size
+ *
+ * Releases the buffer allocated via snd_malloc_pages().
+ */
+void snd_free_pages(void *ptr, size_t size)
+{
+	int pg;
+
+	if (ptr == NULL)
+		return;
+	pg = get_order(size);
+	dec_snd_pages(pg);
+	unmark_pages(virt_to_page(ptr), pg);
+	free_pages((unsigned long) ptr, pg);
+}
+
+/*
+ *
+ *  Bus-specific memory allocators
+ *
+ */
+
+/* allocate the coherent DMA pages */
+static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
+{
+	int pg;
+	void *res;
+	unsigned int gfp_flags;
+
+	snd_assert(size > 0, return NULL);
+	snd_assert(dma != NULL, return NULL);
+	pg = get_order(size);
+	gfp_flags = GFP_KERNEL
+		| __GFP_NORETRY /* don't trigger OOM-killer */
+		| __GFP_NOWARN; /* no stack trace print - this call is non-critical */
+	res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
+	if (res != NULL) {
+#ifdef NEED_RESERVE_PAGES
+		mark_pages(virt_to_page(res), pg); /* should be dma_to_page() */
+#endif
+		inc_snd_pages(pg);
+	}
+
+	return res;
+}
+
+/* free the coherent DMA pages */
+static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
+			       dma_addr_t dma)
+{
+	int pg;
+
+	if (ptr == NULL)
+		return;
+	pg = get_order(size);
+	dec_snd_pages(pg);
+#ifdef NEED_RESERVE_PAGES
+	unmark_pages(virt_to_page(ptr), pg); /* should be dma_to_page() */
+#endif
+	dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
+}
+
+#ifdef CONFIG_SBUS
+
+static void *snd_malloc_sbus_pages(struct device *dev, size_t size,
+				   dma_addr_t *dma_addr)
+{
+	struct sbus_dev *sdev = (struct sbus_dev *)dev;
+	int pg;
+	void *res;
+
+	snd_assert(size > 0, return NULL);
+	snd_assert(dma_addr != NULL, return NULL);
+	pg = get_order(size);
+	res = sbus_alloc_consistent(sdev, PAGE_SIZE * (1 << pg), dma_addr);
+	if (res != NULL)
+		inc_snd_pages(pg);
+	return res;
+}
+
+static void snd_free_sbus_pages(struct device *dev, size_t size,
+				void *ptr, dma_addr_t dma_addr)
+{
+	struct sbus_dev *sdev = (struct sbus_dev *)dev;
+	int pg;
+
+	if (ptr == NULL)
+		return;
+	pg = get_order(size);
+	dec_snd_pages(pg);
+	sbus_free_consistent(sdev, PAGE_SIZE * (1 << pg), ptr, dma_addr);
+}
+
+#endif /* CONFIG_SBUS */
+
+/*
+ *
+ *  ALSA generic memory management
+ *
+ */
+
+
+/**
+ * snd_dma_alloc_pages - allocate the buffer area according to the given type
+ * @type: the DMA buffer type
+ * @device: the device pointer
+ * @size: the buffer size to allocate
+ * @dmab: buffer allocation record to store the allocated data
+ *
+ * Calls the memory-allocator function for the corresponding
+ * buffer type.
+ * 
+ * Returns zero if the buffer with the given size is allocated successfuly,
+ * other a negative value at error.
+ */
+int snd_dma_alloc_pages(int type, struct device *device, size_t size,
+			struct snd_dma_buffer *dmab)
+{
+	snd_assert(size > 0, return -ENXIO);
+	snd_assert(dmab != NULL, return -ENXIO);
+
+	dmab->dev.type = type;
+	dmab->dev.dev = device;
+	dmab->bytes = 0;
+	switch (type) {
+	case SNDRV_DMA_TYPE_CONTINUOUS:
+		dmab->area = snd_malloc_pages(size, (unsigned long)device);
+		dmab->addr = 0;
+		break;
+#ifdef CONFIG_SBUS
+	case SNDRV_DMA_TYPE_SBUS:
+		dmab->area = snd_malloc_sbus_pages(device, size, &dmab->addr);
+		break;
+#endif
+	case SNDRV_DMA_TYPE_DEV:
+		dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
+		break;
+	case SNDRV_DMA_TYPE_DEV_SG:
+		snd_malloc_sgbuf_pages(device, size, dmab, NULL);
+		break;
+	default:
+		printk(KERN_ERR "snd-malloc: invalid device type %d\n", type);
+		dmab->area = NULL;
+		dmab->addr = 0;
+		return -ENXIO;
+	}
+	if (! dmab->area)
+		return -ENOMEM;
+	dmab->bytes = size;
+	return 0;
+}
+
+/**
+ * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
+ * @type: the DMA buffer type
+ * @device: the device pointer
+ * @size: the buffer size to allocate
+ * @dmab: buffer allocation record to store the allocated data
+ *
+ * Calls the memory-allocator function for the corresponding
+ * buffer type.  When no space is left, this function reduces the size and
+ * tries to allocate again.  The size actually allocated is stored in
+ * res_size argument.
+ * 
+ * Returns zero if the buffer with the given size is allocated successfuly,
+ * other a negative value at error.
+ */
+int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
+				 struct snd_dma_buffer *dmab)
+{
+	int err;
+
+	snd_assert(size > 0, return -ENXIO);
+	snd_assert(dmab != NULL, return -ENXIO);
+
+	while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
+		if (err != -ENOMEM)
+			return err;
+		size >>= 1;
+		if (size <= PAGE_SIZE)
+			return -ENOMEM;
+	}
+	if (! dmab->area)
+		return -ENOMEM;
+	return 0;
+}
+
+
+/**
+ * snd_dma_free_pages - release the allocated buffer
+ * @dmab: the buffer allocation record to release
+ *
+ * Releases the allocated buffer via snd_dma_alloc_pages().
+ */
+void snd_dma_free_pages(struct snd_dma_buffer *dmab)
+{
+	switch (dmab->dev.type) {
+	case SNDRV_DMA_TYPE_CONTINUOUS:
+		snd_free_pages(dmab->area, dmab->bytes);
+		break;
+#ifdef CONFIG_SBUS
+	case SNDRV_DMA_TYPE_SBUS:
+		snd_free_sbus_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
+		break;
+#endif
+	case SNDRV_DMA_TYPE_DEV:
+		snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
+		break;
+	case SNDRV_DMA_TYPE_DEV_SG:
+		snd_free_sgbuf_pages(dmab);
+		break;
+	default:
+		printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type);
+	}
+}
+
+
+/**
+ * snd_dma_get_reserved - get the reserved buffer for the given device
+ * @dmab: the buffer allocation record to store
+ * @id: the buffer id
+ *
+ * Looks for the reserved-buffer list and re-uses if the same buffer
+ * is found in the list.  When the buffer is found, it's removed from the free list.
+ *
+ * Returns the size of buffer if the buffer is found, or zero if not found.
+ */
+size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id)
+{
+	struct list_head *p;
+	struct snd_mem_list *mem;
+
+	snd_assert(dmab, return 0);
+
+	down(&list_mutex);
+	list_for_each(p, &mem_list_head) {
+		mem = list_entry(p, struct snd_mem_list, list);
+		if (mem->id == id &&
+		    ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev))) {
+			list_del(p);
+			*dmab = mem->buffer;
+			kfree(mem);
+			up(&list_mutex);
+			return dmab->bytes;
+		}
+	}
+	up(&list_mutex);
+	return 0;
+}
+
+/**
+ * snd_dma_reserve_buf - reserve the buffer
+ * @dmab: the buffer to reserve
+ * @id: the buffer id
+ *
+ * Reserves the given buffer as a reserved buffer.
+ * 
+ * Returns zero if successful, or a negative code at error.
+ */
+int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id)
+{
+	struct snd_mem_list *mem;
+
+	snd_assert(dmab, return -EINVAL);
+	mem = kmalloc(sizeof(*mem), GFP_KERNEL);
+	if (! mem)
+		return -ENOMEM;
+	down(&list_mutex);
+	mem->buffer = *dmab;
+	mem->id = id;
+	list_add_tail(&mem->list, &mem_list_head);
+	up(&list_mutex);
+	return 0;
+}
+
+/*
+ * purge all reserved buffers
+ */
+static void free_all_reserved_pages(void)
+{
+	struct list_head *p;
+	struct snd_mem_list *mem;
+
+	down(&list_mutex);
+	while (! list_empty(&mem_list_head)) {
+		p = mem_list_head.next;
+		mem = list_entry(p, struct snd_mem_list, list);
+		list_del(p);
+		snd_dma_free_pages(&mem->buffer);
+		kfree(mem);
+	}
+	up(&list_mutex);
+}
+
+
+
+/*
+ * allocation of buffers for pre-defined devices
+ */
+
+#ifdef CONFIG_PCI
+/* FIXME: for pci only - other bus? */
+struct prealloc_dev {
+	unsigned short vendor;
+	unsigned short device;
+	unsigned long dma_mask;
+	unsigned int size;
+	unsigned int buffers;
+};
+
+#define HAMMERFALL_BUFFER_SIZE    (16*1024*4*(26+1)+0x10000)
+
+static struct prealloc_dev prealloc_devices[] __initdata = {
+	{
+		/* hammerfall */
+		.vendor = 0x10ee,
+		.device = 0x3fc4,
+		.dma_mask = 0xffffffff,
+		.size = HAMMERFALL_BUFFER_SIZE,
+		.buffers = 2
+	},
+	{
+		/* HDSP */
+		.vendor = 0x10ee,
+		.device = 0x3fc5,
+		.dma_mask = 0xffffffff,
+		.size = HAMMERFALL_BUFFER_SIZE,
+		.buffers = 2
+	},
+	{ }, /* terminator */
+};
+
+static void __init preallocate_cards(void)
+{
+	struct pci_dev *pci = NULL;
+	int card;
+
+	card = 0;
+
+	while ((pci = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pci)) != NULL) {
+		struct prealloc_dev *dev;
+		unsigned int i;
+		if (card >= SNDRV_CARDS)
+			break;
+		for (dev = prealloc_devices; dev->vendor; dev++) {
+			if (dev->vendor == pci->vendor && dev->device == pci->device)
+				break;
+		}
+		if (! dev->vendor)
+			continue;
+		if (! enable[card++]) {
+			printk(KERN_DEBUG "snd-page-alloc: skipping card %d, device %04x:%04x\n", card, pci->vendor, pci->device);
+			continue;
+		}
+			
+		if (pci_set_dma_mask(pci, dev->dma_mask) < 0 ||
+		    pci_set_consistent_dma_mask(pci, dev->dma_mask) < 0) {
+			printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", dev->dma_mask, dev->vendor, dev->device);
+			continue;
+		}
+		for (i = 0; i < dev->buffers; i++) {
+			struct snd_dma_buffer dmab;
+			memset(&dmab, 0, sizeof(dmab));
+			if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci),
+						dev->size, &dmab) < 0)
+				printk(KERN_WARNING "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", dev->size);
+			else
+				snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci));
+		}
+	}
+}
+#else
+#define preallocate_cards()	/* NOP */
+#endif
+
+
+#ifdef CONFIG_PROC_FS
+/*
+ * proc file interface
+ */
+static int snd_mem_proc_read(char *page, char **start, off_t off,
+			     int count, int *eof, void *data)
+{
+	int len = 0;
+	long pages = snd_allocated_pages >> (PAGE_SHIFT-12);
+	struct list_head *p;
+	struct snd_mem_list *mem;
+	int devno;
+	static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG", "SBUS" };
+
+	down(&list_mutex);
+	len += snprintf(page + len, count - len,
+			"pages  : %li bytes (%li pages per %likB)\n",
+			pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
+	devno = 0;
+	list_for_each(p, &mem_list_head) {
+		mem = list_entry(p, struct snd_mem_list, list);
+		devno++;
+		len += snprintf(page + len, count - len,
+				"buffer %d : ID %08x : type %s\n",
+				devno, mem->id, types[mem->buffer.dev.type]);
+		len += snprintf(page + len, count - len,
+				"  addr = 0x%lx, size = %d bytes\n",
+				(unsigned long)mem->buffer.addr, (int)mem->buffer.bytes);
+	}
+	up(&list_mutex);
+	return len;
+}
+#endif /* CONFIG_PROC_FS */
+
+/*
+ * module entry
+ */
+
+static int __init snd_mem_init(void)
+{
+#ifdef CONFIG_PROC_FS
+	create_proc_read_entry("driver/snd-page-alloc", 0, NULL, snd_mem_proc_read, NULL);
+#endif
+	preallocate_cards();
+	return 0;
+}
+
+static void __exit snd_mem_exit(void)
+{
+	remove_proc_entry("driver/snd-page-alloc", NULL);
+	free_all_reserved_pages();
+	if (snd_allocated_pages > 0)
+		printk(KERN_ERR "snd-malloc: Memory leak?  pages not freed = %li\n", snd_allocated_pages);
+}
+
+
+module_init(snd_mem_init)
+module_exit(snd_mem_exit)
+
+
+/*
+ * exports
+ */
+EXPORT_SYMBOL(snd_dma_alloc_pages);
+EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
+EXPORT_SYMBOL(snd_dma_free_pages);
+
+EXPORT_SYMBOL(snd_dma_get_reserved_buf);
+EXPORT_SYMBOL(snd_dma_reserve_buf);
+
+EXPORT_SYMBOL(snd_malloc_pages);
+EXPORT_SYMBOL(snd_free_pages);