aboutsummaryrefslogtreecommitdiffstats
path: root/sound/core/memalloc.c
diff options
context:
space:
mode:
Diffstat (limited to 'sound/core/memalloc.c')
-rw-r--r--sound/core/memalloc.c547
1 files changed, 547 insertions, 0 deletions
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
new file mode 100644
index 00000000..16bd9c03
--- /dev/null
+++ b/sound/core/memalloc.c
@@ -0,0 +1,547 @@
+/*
+ * Copyright (c) by Jaroslav Kysela <perex@perex.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/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/seq_file.h>
+#include <asm/uaccess.h>
+#include <linux/dma-mapping.h>
+#include <linux/moduleparam.h>
+#include <linux/mutex.h>
+#include <sound/memalloc.h>
+
+
+MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
+MODULE_DESCRIPTION("Memory allocator for ALSA system.");
+MODULE_LICENSE("GPL");
+
+
+/*
+ */
+
+static DEFINE_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
+
+/*
+ *
+ * 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;
+}
+
+/**
+ * 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, gfp_t gfp_flags)
+{
+ int pg;
+ void *res;
+
+ if (WARN_ON(!size))
+ return NULL;
+ if (WARN_ON(!gfp_flags))
+ return NULL;
+ gfp_flags |= __GFP_COMP; /* compound page lets parts be mapped */
+ pg = get_order(size);
+ if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL)
+ 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);
+ free_pages((unsigned long) ptr, pg);
+}
+
+/*
+ *
+ * Bus-specific memory allocators
+ *
+ */
+
+#ifdef CONFIG_HAS_DMA
+/* 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;
+ gfp_t gfp_flags;
+
+ if (WARN_ON(!dma))
+ return NULL;
+ pg = get_order(size);
+ gfp_flags = GFP_KERNEL
+ | __GFP_COMP /* compound page lets parts be mapped */
+ | __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)
+ 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);
+ dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
+}
+#endif /* CONFIG_HAS_DMA */
+
+/*
+ *
+ * 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)
+{
+ if (WARN_ON(!size))
+ return -ENXIO;
+ if (WARN_ON(!dmab))
+ 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,
+ (__force gfp_t)(unsigned long)device);
+ dmab->addr = 0;
+ break;
+#ifdef CONFIG_HAS_DMA
+ case SNDRV_DMA_TYPE_DEV:
+ dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
+ break;
+#endif
+#ifdef CONFIG_SND_DMA_SGBUF
+ case SNDRV_DMA_TYPE_DEV_SG:
+ snd_malloc_sgbuf_pages(device, size, dmab, NULL);
+ break;
+#endif
+ 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;
+
+ while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
+ size_t aligned_size;
+ if (err != -ENOMEM)
+ return err;
+ if (size <= PAGE_SIZE)
+ return -ENOMEM;
+ aligned_size = PAGE_SIZE << get_order(size);
+ if (size != aligned_size)
+ size = aligned_size;
+ else
+ size >>= 1;
+ }
+ 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_HAS_DMA
+ case SNDRV_DMA_TYPE_DEV:
+ snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
+ break;
+#endif
+#ifdef CONFIG_SND_DMA_SGBUF
+ case SNDRV_DMA_TYPE_DEV_SG:
+ snd_free_sgbuf_pages(dmab);
+ break;
+#endif
+ 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 snd_mem_list *mem;
+
+ if (WARN_ON(!dmab))
+ return 0;
+
+ mutex_lock(&list_mutex);
+ list_for_each_entry(mem, &mem_list_head, list) {
+ if (mem->id == id &&
+ (mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL ||
+ ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) {
+ struct device *dev = dmab->dev.dev;
+ list_del(&mem->list);
+ *dmab = mem->buffer;
+ if (dmab->dev.dev == NULL)
+ dmab->dev.dev = dev;
+ kfree(mem);
+ mutex_unlock(&list_mutex);
+ return dmab->bytes;
+ }
+ }
+ mutex_unlock(&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;
+
+ if (WARN_ON(!dmab))
+ return -EINVAL;
+ mem = kmalloc(sizeof(*mem), GFP_KERNEL);
+ if (! mem)
+ return -ENOMEM;
+ mutex_lock(&list_mutex);
+ mem->buffer = *dmab;
+ mem->id = id;
+ list_add_tail(&mem->list, &mem_list_head);
+ mutex_unlock(&list_mutex);
+ return 0;
+}
+
+/*
+ * purge all reserved buffers
+ */
+static void free_all_reserved_pages(void)
+{
+ struct list_head *p;
+ struct snd_mem_list *mem;
+
+ mutex_lock(&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);
+ }
+ mutex_unlock(&list_mutex);
+}
+
+
+#ifdef CONFIG_PROC_FS
+/*
+ * proc file interface
+ */
+#define SND_MEM_PROC_FILE "driver/snd-page-alloc"
+static struct proc_dir_entry *snd_mem_proc;
+
+static int snd_mem_proc_read(struct seq_file *seq, void *offset)
+{
+ long pages = snd_allocated_pages >> (PAGE_SHIFT-12);
+ struct snd_mem_list *mem;
+ int devno;
+ static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG" };
+
+ mutex_lock(&list_mutex);
+ seq_printf(seq, "pages : %li bytes (%li pages per %likB)\n",
+ pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
+ devno = 0;
+ list_for_each_entry(mem, &mem_list_head, list) {
+ devno++;
+ seq_printf(seq, "buffer %d : ID %08x : type %s\n",
+ devno, mem->id, types[mem->buffer.dev.type]);
+ seq_printf(seq, " addr = 0x%lx, size = %d bytes\n",
+ (unsigned long)mem->buffer.addr,
+ (int)mem->buffer.bytes);
+ }
+ mutex_unlock(&list_mutex);
+ return 0;
+}
+
+static int snd_mem_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, snd_mem_proc_read, NULL);
+}
+
+/* FIXME: for pci only - other bus? */
+#ifdef CONFIG_PCI
+#define gettoken(bufp) strsep(bufp, " \t\n")
+
+static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer,
+ size_t count, loff_t * ppos)
+{
+ char buf[128];
+ char *token, *p;
+
+ if (count > sizeof(buf) - 1)
+ return -EINVAL;
+ if (copy_from_user(buf, buffer, count))
+ return -EFAULT;
+ buf[count] = '\0';
+
+ p = buf;
+ token = gettoken(&p);
+ if (! token || *token == '#')
+ return count;
+ if (strcmp(token, "add") == 0) {
+ char *endp;
+ int vendor, device, size, buffers;
+ long mask;
+ int i, alloced;
+ struct pci_dev *pci;
+
+ if ((token = gettoken(&p)) == NULL ||
+ (vendor = simple_strtol(token, NULL, 0)) <= 0 ||
+ (token = gettoken(&p)) == NULL ||
+ (device = simple_strtol(token, NULL, 0)) <= 0 ||
+ (token = gettoken(&p)) == NULL ||
+ (mask = simple_strtol(token, NULL, 0)) < 0 ||
+ (token = gettoken(&p)) == NULL ||
+ (size = memparse(token, &endp)) < 64*1024 ||
+ size > 16*1024*1024 /* too big */ ||
+ (token = gettoken(&p)) == NULL ||
+ (buffers = simple_strtol(token, NULL, 0)) <= 0 ||
+ buffers > 4) {
+ printk(KERN_ERR "snd-page-alloc: invalid proc write format\n");
+ return count;
+ }
+ vendor &= 0xffff;
+ device &= 0xffff;
+
+ alloced = 0;
+ pci = NULL;
+ while ((pci = pci_get_device(vendor, device, pci)) != NULL) {
+ if (mask > 0 && mask < 0xffffffff) {
+ if (pci_set_dma_mask(pci, mask) < 0 ||
+ pci_set_consistent_dma_mask(pci, mask) < 0) {
+ printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device);
+ pci_dev_put(pci);
+ return count;
+ }
+ }
+ for (i = 0; i < 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),
+ size, &dmab) < 0) {
+ printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
+ pci_dev_put(pci);
+ return count;
+ }
+ snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci));
+ }
+ alloced++;
+ }
+ if (! alloced) {
+ for (i = 0; i < buffers; i++) {
+ struct snd_dma_buffer dmab;
+ memset(&dmab, 0, sizeof(dmab));
+ /* FIXME: We can allocate only in ZONE_DMA
+ * without a device pointer!
+ */
+ if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL,
+ size, &dmab) < 0) {
+ printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
+ break;
+ }
+ snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device));
+ }
+ }
+ } else if (strcmp(token, "erase") == 0)
+ /* FIXME: need for releasing each buffer chunk? */
+ free_all_reserved_pages();
+ else
+ printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n");
+ return count;
+}
+#endif /* CONFIG_PCI */
+
+static const struct file_operations snd_mem_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = snd_mem_proc_open,
+ .read = seq_read,
+#ifdef CONFIG_PCI
+ .write = snd_mem_proc_write,
+#endif
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+#endif /* CONFIG_PROC_FS */
+
+/*
+ * module entry
+ */
+
+static int __init snd_mem_init(void)
+{
+#ifdef CONFIG_PROC_FS
+ snd_mem_proc = proc_create(SND_MEM_PROC_FILE, 0644, NULL,
+ &snd_mem_proc_fops);
+#endif
+ return 0;
+}
+
+static void __exit snd_mem_exit(void)
+{
+ remove_proc_entry(SND_MEM_PROC_FILE, 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);
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-10 08:02:52 +0000