module did formerly. It will allocate the buffers in advance
when any HDSP cards are found. To make the buffer
allocation sure, load snd-page-alloc module in the early
- stage of boot sequence.
+ stage of boot sequence. See "Early Buffer Allocation"
+ section.
Module snd-ice1712
------------------
module did formerly. It will allocate the buffers in advance
when any RME9652 cards are found. To make the buffer
allocation sure, load snd-page-alloc module in the early
- stage of boot sequence.
+ stage of boot sequence. See "Early Buffer Allocation"
+ section.
Module snd-sa11xx-uda1341 (on arm only)
---------------------------------------
echo "rvplayer 0 0 block" > /proc/asound/card0/pcm0p/oss
+Early Buffer Allocation
+=======================
+
+Some drivers (e.g. hdsp) require the large contiguous buffers, and
+sometimes it's too late to find such spaces when the driver module is
+actually loaded due to memory fragmentation. You can pre-allocate the
+PCM buffers by loading snd-page-alloc module and write commands to its
+proc file in prior, for example, in the early boot stage like
+/etc/init.d/*.local scripts.
+
+Reading the proc file /proc/drivers/snd-page-alloc shows the current
+usage of page allocation. In writing, you can send the following
+commands to the snd-page-alloc driver:
+
+ - add VENDOR DEVICE MASK SIZE BUFFERS
+
+ VENDOR and DEVICE are PCI vendor and device IDs. They take
+ integer numbers (0x prefix is needed for the hex).
+ MASK is the PCI DMA mask. Pass 0 if not restricted.
+ SIZE is the size of each buffer to allocate. You can pass
+ k and m suffix for KB and MB. The max number is 16MB.
+ BUFFERS is the number of buffers to allocate. It must be greater
+ than 0. The max number is 4.
+
+ - erase
+
+ This will erase the all pre-allocated buffers which are not in
+ use.
+
+
Links
=====
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/mm.h>
+#include <asm/uaccess.h>
#include <linux/dma-mapping.h>
#include <linux/moduleparam.h>
#include <asm/semaphore.h>
#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
-
/*
*/
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))) {
+ (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(p);
*dmab = mem->buffer;
+ if (dmab->dev.dev == NULL)
+ dmab->dev.dev = dev;
kfree(mem);
up(&list_mutex);
return dmab->bytes;
}
-
-/*
- * 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
*/
+#define SND_MEM_PROC_FILE "driver/snd-page-alloc"
+struct proc_dir_entry *snd_mem_proc;
+
static int snd_mem_proc_read(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
up(&list_mutex);
return len;
}
+
+/* FIXME: for pci only - other bus? */
+#ifdef CONFIG_PCI
+#define gettoken(bufp) strsep(bufp, " \t\n")
+
+static int snd_mem_proc_write(struct file *file, const char __user *buffer,
+ unsigned long count, void *data)
+{
+ char buf[128];
+ char *token, *p;
+
+ if (count > ARRAY_SIZE(buf) - 1)
+ count = ARRAY_SIZE(buf) - 1;
+ if (copy_from_user(buf, buffer, count))
+ return -EFAULT;
+ buf[ARRAY_SIZE(buf) - 1] = '\0';
+
+ p = buf;
+ token = gettoken(&p);
+ if (! token || *token == '#')
+ return (int)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 (int)count;
+ }
+ vendor &= 0xffff;
+ device &= 0xffff;
+
+ alloced = 0;
+ pci = NULL;
+ while ((pci = pci_find_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);
+ return (int)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);
+ return (int)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 (int)count;
+}
+#endif /* CONFIG_PCI */
#endif /* CONFIG_PROC_FS */
/*
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);
+ snd_mem_proc = create_proc_entry(SND_MEM_PROC_FILE, 0644, NULL);
+ if (snd_mem_proc) {
+ snd_mem_proc->read_proc = snd_mem_proc_read;
+#ifdef CONFIG_PCI
+ snd_mem_proc->write_proc = snd_mem_proc_write;
+#endif
+ }
#endif
- preallocate_cards();
return 0;
}
static void __exit snd_mem_exit(void)
{
- remove_proc_entry("driver/snd-page-alloc", NULL);
+ if (snd_mem_proc)
+ 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);
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