From: Takashi Iwai Date: Mon, 30 May 2005 16:27:03 +0000 (+0200) Subject: [ALSA] Add write support to snd-page-alloc proc file X-Git-Tag: v2.6.13-rc1~68^2~569 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b6a969155b04416185f368bd4e2f1d49b17c1ee1;p=linux-2.6 [ALSA] Add write support to snd-page-alloc proc file Documentation,Memalloc module,RME HDSP driver,RME9652 driver Add the write support to snd-page-alloc proc file for buffer pre-allocation. Removed the pre-allocation codes via module options. Signed-off-by: Takashi Iwai --- diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt index 226013035d..812ed2b80b 100644 --- a/Documentation/sound/alsa/ALSA-Configuration.txt +++ b/Documentation/sound/alsa/ALSA-Configuration.txt @@ -671,7 +671,8 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed. 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 ------------------ @@ -1067,7 +1068,8 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed. 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) --------------------------------------- @@ -1545,6 +1547,36 @@ Proc interfaces (/proc/asound) 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 ===== diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c index 344a83fd7c..dbc23e35fa 100644 --- a/sound/core/memalloc.c +++ b/sound/core/memalloc.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include #include @@ -46,13 +47,6 @@ MODULE_LICENSE("GPL"); #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 - /* */ @@ -451,9 +445,13 @@ size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id) 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; @@ -508,91 +506,13 @@ static void free_all_reserved_pages(void) } - -/* - * 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) { @@ -621,6 +541,97 @@ static int snd_mem_proc_read(char *page, char **start, off_t off, 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 */ /* @@ -630,15 +641,21 @@ static int snd_mem_proc_read(char *page, char **start, off_t off, 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); diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c index b35ed5f0c0..a673cc438b 100644 --- a/sound/pci/rme9652/hdsp.c +++ b/sound/pci/rme9652/hdsp.c @@ -559,18 +559,22 @@ static int snd_hammerfall_get_buffer(struct pci_dev *pci, struct snd_dma_buffer { dmab->dev.type = SNDRV_DMA_TYPE_DEV; dmab->dev.dev = snd_dma_pci_data(pci); - if (! snd_dma_get_reserved_buf(dmab, snd_dma_pci_buf_id(pci))) { - if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci), - size, dmab) < 0) - return -ENOMEM; + if (snd_dma_get_reserved_buf(dmab, snd_dma_pci_buf_id(pci))) { + if (dmab->bytes >= size) + return 0; } + if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci), + size, dmab) < 0) + return -ENOMEM; return 0; } static void snd_hammerfall_free_buffer(struct snd_dma_buffer *dmab, struct pci_dev *pci) { - if (dmab->area) + if (dmab->area) { + dmab->dev.dev = NULL; /* make it anonymous */ snd_dma_reserve_buf(dmab, snd_dma_pci_buf_id(pci)); + } } diff --git a/sound/pci/rme9652/rme9652.c b/sound/pci/rme9652/rme9652.c index 5861f234af..f3037402d5 100644 --- a/sound/pci/rme9652/rme9652.c +++ b/sound/pci/rme9652/rme9652.c @@ -303,18 +303,22 @@ static int snd_hammerfall_get_buffer(struct pci_dev *pci, struct snd_dma_buffer { dmab->dev.type = SNDRV_DMA_TYPE_DEV; dmab->dev.dev = snd_dma_pci_data(pci); - if (! snd_dma_get_reserved_buf(dmab, snd_dma_pci_buf_id(pci))) { - if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci), - size, dmab) < 0) - return -ENOMEM; + if (snd_dma_get_reserved_buf(dmab, snd_dma_pci_buf_id(pci))) { + if (dmab->bytes >= size) + return 0; } + if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci), + size, dmab) < 0) + return -ENOMEM; return 0; } static void snd_hammerfall_free_buffer(struct snd_dma_buffer *dmab, struct pci_dev *pci) { - if (dmab->area) + if (dmab->area) { + dmab->dev.dev = NULL; /* make it anonymous */ snd_dma_reserve_buf(dmab, snd_dma_pci_buf_id(pci)); + } }