From aa1e77e691025149908f7641e77de93ffd7f1188 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Mon, 12 Dec 2005 09:36:01 +0100 Subject: [ALSA] seq: reorganize sequencer client numbers Modules: ALSA sequencer Reduce the maximum possible number of global clients to 16 to make more numbers available for card clients, and allow dynamically allocated card client numbers to share the same range as application client numbers to make sure that all 32 cards can be used at the same time. Signed-off-by: Clemens Ladisch --- sound/core/seq/seq.c | 4 +-- sound/core/seq/seq_clientmgr.c | 57 +++++++++++++++++++++++------------------- 2 files changed, 33 insertions(+), 28 deletions(-) (limited to 'sound/core') diff --git a/sound/core/seq/seq.c b/sound/core/seq/seq.c index 24644150f24..20f954bc7aa 100644 --- a/sound/core/seq/seq.c +++ b/sound/core/seq/seq.c @@ -36,9 +36,9 @@ #include #if defined(CONFIG_SND_SEQ_DUMMY_MODULE) -int seq_client_load[64] = {[0] = SNDRV_SEQ_CLIENT_DUMMY, [1 ... 63] = -1}; +int seq_client_load[15] = {[0] = SNDRV_SEQ_CLIENT_DUMMY, [1 ... 14] = -1}; #else -int seq_client_load[64] = {[0 ... 63] = -1}; +int seq_client_load[15] = {[0 ... 14] = -1}; #endif int seq_default_timer_class = SNDRV_TIMER_CLASS_GLOBAL; int seq_default_timer_sclass = SNDRV_TIMER_SCLASS_NONE; diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c index 606d076f72f..fd2032eae21 100644 --- a/sound/core/seq/seq_clientmgr.c +++ b/sound/core/seq/seq_clientmgr.c @@ -47,9 +47,20 @@ * */ -/* range for dynamically allocated client numbers of kernel drivers */ -#define SNDRV_SEQ_DYNAMIC_CLIENT_BEGIN 16 -#define SNDRV_SEQ_DYNAMIC_CLIENT_END 48 +/* + * There are four ranges of client numbers (last two shared): + * 0..15: global clients + * 16..127: statically allocated client numbers for cards 0..27 + * 128..191: dynamically allocated client numbers for cards 28..31 + * 128..191: dynamically allocated client numbers for applications + */ + +/* number of kernel non-card clients */ +#define SNDRV_SEQ_GLOBAL_CLIENTS 16 +/* clients per cards, for static clients */ +#define SNDRV_SEQ_CLIENTS_PER_CARD 4 +/* dynamically allocated client numbers (both kernel drivers and user space) */ +#define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128 #define SNDRV_SEQ_LFLG_INPUT 0x0001 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002 @@ -143,14 +154,14 @@ struct snd_seq_client *snd_seq_client_use_ptr(int clientid) spin_unlock_irqrestore(&clients_lock, flags); #ifdef CONFIG_KMOD if (!in_interrupt() && current->fs->root) { - static char client_requested[64]; + static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS]; static char card_requested[SNDRV_CARDS]; - if (clientid < 64) { + if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) { int idx; if (! client_requested[clientid] && current->fs->root) { client_requested[clientid] = 1; - for (idx = 0; idx < 64; idx++) { + for (idx = 0; idx < 15; idx++) { if (seq_client_load[idx] < 0) break; if (seq_client_load[idx] == clientid) { @@ -160,8 +171,9 @@ struct snd_seq_client *snd_seq_client_use_ptr(int clientid) } } } - } else if (clientid >= 64 && clientid < 128) { - int card = (clientid - 64) / 4; + } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) { + int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) / + SNDRV_SEQ_CLIENTS_PER_CARD; if (card < snd_ecards_limit) { if (! card_requested[card]) { card_requested[card] = 1; @@ -207,8 +219,7 @@ int __init client_init_data(void) } -static struct snd_seq_client *seq_create_client1(int client_index, int poolsize, - int kernel_client) +static struct snd_seq_client *seq_create_client1(int client_index, int poolsize) { unsigned long flags; int c; @@ -232,15 +243,9 @@ static struct snd_seq_client *seq_create_client1(int client_index, int poolsize, /* find free slot in the client table */ spin_lock_irqsave(&clients_lock, flags); if (client_index < 0) { - int cmin, cmax; - if (kernel_client) { - cmin = SNDRV_SEQ_DYNAMIC_CLIENT_BEGIN; - cmax = SNDRV_SEQ_DYNAMIC_CLIENT_END; - } else { - cmin = 128; - cmax = SNDRV_SEQ_MAX_CLIENTS; - } - for (c = cmin; c < cmax; c++) { + for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN; + c < SNDRV_SEQ_MAX_CLIENTS; + c++) { if (clienttab[c] || clienttablock[c]) continue; clienttab[client->number = c] = client; @@ -319,7 +324,7 @@ static int snd_seq_open(struct inode *inode, struct file *file) if (down_interruptible(®ister_mutex)) return -ERESTARTSYS; - client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS, 0); + client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS); if (client == NULL) { up(®ister_mutex); return -ENOMEM; /* failure code */ @@ -2220,23 +2225,23 @@ int snd_seq_create_kernel_client(struct snd_card *card, int client_index, snd_assert(! in_interrupt(), return -EBUSY); - if (card && client_index > 3) + if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) return -EINVAL; - if (card == NULL && client_index > 63) + if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) return -EINVAL; if (down_interruptible(®ister_mutex)) return -ERESTARTSYS; if (card) { - if (card->number < 16) - client_index += 64 + (card->number << 2); - else + client_index += SNDRV_SEQ_GLOBAL_CLIENTS + + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; + if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) client_index = -1; } /* empty write queue as default */ - client = seq_create_client1(client_index, 0, 1); + client = seq_create_client1(client_index, 0); if (client == NULL) { up(®ister_mutex); return -EBUSY; /* failure code */ -- cgit v1.2.3-18-g5258