diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ieee1394/hosts.c | 3 | ||||
| -rw-r--r-- | drivers/ieee1394/hosts.h | 19 | ||||
| -rw-r--r-- | drivers/ieee1394/ieee1394_transactions.c | 108 | ||||
| -rw-r--r-- | drivers/ieee1394/ieee1394_transactions.h | 4 | ||||
| -rw-r--r-- | drivers/ieee1394/ieee1394_types.h | 23 | ||||
| -rw-r--r-- | drivers/ieee1394/nodemgr.c | 43 | ||||
| -rw-r--r-- | drivers/ieee1394/nodemgr.h | 1 |
7 files changed, 102 insertions, 99 deletions
diff --git a/drivers/ieee1394/hosts.c b/drivers/ieee1394/hosts.c index 59e6f49..d90a3a1 100644 --- a/drivers/ieee1394/hosts.c +++ b/drivers/ieee1394/hosts.c @@ -143,9 +143,6 @@ struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra, for (i = 2; i < 16; i++) h->csr.gen_timestamp[i] = jiffies - 60 * HZ; - for (i = 0; i < ARRAY_SIZE(h->tpool); i++) - HPSB_TPOOL_INIT(&h->tpool[i]); - atomic_set(&h->generation, 0); INIT_WORK(&h->delayed_reset, delayed_reset_bus, h); diff --git a/drivers/ieee1394/hosts.h b/drivers/ieee1394/hosts.h index 69a7c9f..bc6dbfa 100644 --- a/drivers/ieee1394/hosts.h +++ b/drivers/ieee1394/hosts.h @@ -35,7 +35,6 @@ struct hpsb_host { int node_count; /* number of identified nodes on this bus */ int selfid_count; /* total number of SelfIDs received */ int nodes_active; /* number of nodes with active link layer */ - u8 speed[ALL_NODES]; /* speed between each node and local node */ nodeid_t node_id; /* node ID of this host */ nodeid_t irm_id; /* ID of this bus' isochronous resource manager */ @@ -55,31 +54,29 @@ struct hpsb_host { int reset_retries; quadlet_t *topology_map; u8 *speed_map; - struct csr_control csr; - - /* Per node tlabel pool allocation */ - struct hpsb_tlabel_pool tpool[ALL_NODES]; + int id; struct hpsb_host_driver *driver; - struct pci_dev *pdev; - - int id; - struct device device; struct class_device class_dev; int update_config_rom; struct work_struct delayed_reset; - unsigned int config_roms; struct list_head addr_space; u64 low_addr_space; /* upper bound of physical DMA area */ u64 middle_addr_space; /* upper bound of posted write area */ -}; + u8 speed[ALL_NODES]; /* speed between each node and local node */ + /* per node tlabel allocation */ + u8 next_tl[ALL_NODES]; + struct { DECLARE_BITMAP(map, 64); } tl_pool[ALL_NODES]; + + struct csr_control csr; +}; enum devctl_cmd { /* Host is requested to reset its bus and cancel all outstanding async diff --git a/drivers/ieee1394/ieee1394_transactions.c b/drivers/ieee1394/ieee1394_transactions.c index 7519600..0833fc9 100644 --- a/drivers/ieee1394/ieee1394_transactions.c +++ b/drivers/ieee1394/ieee1394_transactions.c @@ -9,10 +9,9 @@ * directory of the kernel sources for details. */ -#include <linux/sched.h> #include <linux/bitops.h> -#include <linux/smp_lock.h> -#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/wait.h> #include <asm/bug.h> #include <asm/errno.h> @@ -21,8 +20,6 @@ #include "ieee1394_types.h" #include "hosts.h" #include "ieee1394_core.h" -#include "highlevel.h" -#include "nodemgr.h" #include "ieee1394_transactions.h" #define PREP_ASYNC_HEAD_ADDRESS(tc) \ @@ -32,6 +29,13 @@ packet->header[1] = (packet->host->node_id << 16) | (addr >> 32); \ packet->header[2] = addr & 0xffffffff +#ifndef HPSB_DEBUG_TLABELS +static +#endif +spinlock_t hpsb_tlabel_lock = SPIN_LOCK_UNLOCKED; + +static DECLARE_WAIT_QUEUE_HEAD(tlabel_wq); + static void fill_async_readquad(struct hpsb_packet *packet, u64 addr) { PREP_ASYNC_HEAD_ADDRESS(TCODE_READQ); @@ -115,9 +119,41 @@ static void fill_async_stream_packet(struct hpsb_packet *packet, int length, packet->tcode = TCODE_ISO_DATA; } +/* same as hpsb_get_tlabel, except that it returns immediately */ +static int hpsb_get_tlabel_atomic(struct hpsb_packet *packet) +{ + unsigned long flags, *tp; + u8 *next; + int tlabel, n = NODEID_TO_NODE(packet->node_id); + + /* Broadcast transactions are complete once the request has been sent. + * Use the same transaction label for all broadcast transactions. */ + if (unlikely(n == ALL_NODES)) { + packet->tlabel = 0; + return 0; + } + tp = packet->host->tl_pool[n].map; + next = &packet->host->next_tl[n]; + + spin_lock_irqsave(&hpsb_tlabel_lock, flags); + tlabel = find_next_zero_bit(tp, 64, *next); + if (tlabel > 63) + tlabel = find_first_zero_bit(tp, 64); + if (tlabel > 63) { + spin_unlock_irqrestore(&hpsb_tlabel_lock, flags); + return -EAGAIN; + } + __set_bit(tlabel, tp); + *next = (tlabel + 1) & 63; + spin_unlock_irqrestore(&hpsb_tlabel_lock, flags); + + packet->tlabel = tlabel; + return 0; +} + /** * hpsb_get_tlabel - allocate a transaction label - * @packet: the packet who's tlabel/tpool we set + * @packet: the packet whose tlabel and tl_pool we set * * Every asynchronous transaction on the 1394 bus needs a transaction * label to match the response to the request. This label has to be @@ -131,42 +167,25 @@ static void fill_async_stream_packet(struct hpsb_packet *packet, int length, * Return value: Zero on success, otherwise non-zero. A non-zero return * generally means there are no available tlabels. If this is called out * of interrupt or atomic context, then it will sleep until can return a - * tlabel. + * tlabel or a signal is received. */ int hpsb_get_tlabel(struct hpsb_packet *packet) { - unsigned long flags; - struct hpsb_tlabel_pool *tp; - int n = NODEID_TO_NODE(packet->node_id); - - if (unlikely(n == ALL_NODES)) - return 0; - tp = &packet->host->tpool[n]; - - if (irqs_disabled() || in_atomic()) { - if (down_trylock(&tp->count)) - return 1; - } else { - down(&tp->count); - } - - spin_lock_irqsave(&tp->lock, flags); - - packet->tlabel = find_next_zero_bit(tp->pool, 64, tp->next); - if (packet->tlabel > 63) - packet->tlabel = find_first_zero_bit(tp->pool, 64); - tp->next = (packet->tlabel + 1) % 64; - /* Should _never_ happen */ - BUG_ON(test_and_set_bit(packet->tlabel, tp->pool)); - tp->allocations++; - spin_unlock_irqrestore(&tp->lock, flags); - - return 0; + if (irqs_disabled() || in_atomic()) + return hpsb_get_tlabel_atomic(packet); + + /* NB: The macro wait_event_interruptible() is called with a condition + * argument with side effect. This is only possible because the side + * effect does not occur until the condition became true, and + * wait_event_interruptible() won't evaluate the condition again after + * that. */ + return wait_event_interruptible(tlabel_wq, + !hpsb_get_tlabel_atomic(packet)); } /** * hpsb_free_tlabel - free an allocated transaction label - * @packet: packet whos tlabel/tpool needs to be cleared + * @packet: packet whose tlabel and tl_pool needs to be cleared * * Frees the transaction label allocated with hpsb_get_tlabel(). The * tlabel has to be freed after the transaction is complete (i.e. response @@ -177,21 +196,20 @@ int hpsb_get_tlabel(struct hpsb_packet *packet) */ void hpsb_free_tlabel(struct hpsb_packet *packet) { - unsigned long flags; - struct hpsb_tlabel_pool *tp; - int n = NODEID_TO_NODE(packet->node_id); + unsigned long flags, *tp; + int tlabel, n = NODEID_TO_NODE(packet->node_id); if (unlikely(n == ALL_NODES)) return; - tp = &packet->host->tpool[n]; - - BUG_ON(packet->tlabel > 63 || packet->tlabel < 0); + tp = packet->host->tl_pool[n].map; + tlabel = packet->tlabel; + BUG_ON(tlabel > 63 || tlabel < 0); - spin_lock_irqsave(&tp->lock, flags); - BUG_ON(!test_and_clear_bit(packet->tlabel, tp->pool)); - spin_unlock_irqrestore(&tp->lock, flags); + spin_lock_irqsave(&hpsb_tlabel_lock, flags); + BUG_ON(!__test_and_clear_bit(tlabel, tp)); + spin_unlock_irqrestore(&hpsb_tlabel_lock, flags); - up(&tp->count); + wake_up_interruptible(&tlabel_wq); } int hpsb_packet_success(struct hpsb_packet *packet) diff --git a/drivers/ieee1394/ieee1394_transactions.h b/drivers/ieee1394/ieee1394_transactions.h index 290d370..c1369c4 100644 --- a/drivers/ieee1394/ieee1394_transactions.h +++ b/drivers/ieee1394/ieee1394_transactions.h @@ -53,4 +53,8 @@ int hpsb_read(struct hpsb_host *host, nodeid_t node, unsigned int generation, int hpsb_write(struct hpsb_host *host, nodeid_t node, unsigned int generation, u64 addr, quadlet_t *buffer, size_t length); +#ifdef HPSB_DEBUG_TLABELS +extern spinlock_t hpsb_tlabel_lock; +#endif + #endif /* _IEEE1394_TRANSACTIONS_H */ diff --git a/drivers/ieee1394/ieee1394_types.h b/drivers/ieee1394/ieee1394_types.h index 16fd2d0..a8de375 100644 --- a/drivers/ieee1394/ieee1394_types.h +++ b/drivers/ieee1394/ieee1394_types.h @@ -2,31 +2,9 @@ #define _IEEE1394_TYPES_H #include <linux/kernel.h> -#include <linux/list.h> -#include <linux/spinlock.h> #include <linux/string.h> #include <linux/types.h> - #include <asm/byteorder.h> -#include <asm/semaphore.h> - -/* Transaction Label handling */ -struct hpsb_tlabel_pool { - DECLARE_BITMAP(pool, 64); - spinlock_t lock; - u8 next; - u32 allocations; - struct semaphore count; -}; - -#define HPSB_TPOOL_INIT(_tp) \ -do { \ - bitmap_zero((_tp)->pool, 64); \ - spin_lock_init(&(_tp)->lock); \ - (_tp)->next = 0; \ - (_tp)->allocations = 0; \ - sema_init(&(_tp)->count, 63); \ -} while (0) typedef u32 quadlet_t; typedef u64 octlet_t; @@ -61,6 +39,7 @@ typedef u16 arm_length_t; #ifdef CONFIG_IEEE1394_VERBOSEDEBUG #define HPSB_VERBOSE(fmt, args...) HPSB_PRINT(KERN_DEBUG, fmt , ## args) +#define HPSB_DEBUG_TLABELS #else #define HPSB_VERBOSE(fmt, args...) #endif diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c index f8f6079..eabc51b 100644 --- a/drivers/ieee1394/nodemgr.c +++ b/drivers/ieee1394/nodemgr.c @@ -327,34 +327,44 @@ static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribut static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL); -/* tlabels_free, tlabels_allocations, tlabels_mask are read non-atomically - * here, therefore displayed values may be occasionally wrong. */ -static ssize_t fw_show_ne_tlabels_free(struct device *dev, struct device_attribute *attr, char *buf) +#ifdef HPSB_DEBUG_TLABELS +static ssize_t fw_show_ne_tlabels_free(struct device *dev, + struct device_attribute *attr, char *buf) { struct node_entry *ne = container_of(dev, struct node_entry, device); - return sprintf(buf, "%d\n", 64 - bitmap_weight(ne->tpool->pool, 64)); -} -static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL); + unsigned long flags; + unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map; + int tf; + spin_lock_irqsave(&hpsb_tlabel_lock, flags); + tf = 64 - bitmap_weight(tp, 64); + spin_unlock_irqrestore(&hpsb_tlabel_lock, flags); -static ssize_t fw_show_ne_tlabels_allocations(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct node_entry *ne = container_of(dev, struct node_entry, device); - return sprintf(buf, "%u\n", ne->tpool->allocations); + return sprintf(buf, "%d\n", tf); } -static DEVICE_ATTR(tlabels_allocations,S_IRUGO,fw_show_ne_tlabels_allocations,NULL); +static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL); -static ssize_t fw_show_ne_tlabels_mask(struct device *dev, struct device_attribute *attr, char *buf) +static ssize_t fw_show_ne_tlabels_mask(struct device *dev, + struct device_attribute *attr, char *buf) { struct node_entry *ne = container_of(dev, struct node_entry, device); + unsigned long flags; + unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map; + u64 tm; + + spin_lock_irqsave(&hpsb_tlabel_lock, flags); #if (BITS_PER_LONG <= 32) - return sprintf(buf, "0x%08lx%08lx\n", ne->tpool->pool[0], ne->tpool->pool[1]); + tm = ((u64)tp[0] << 32) + tp[1]; #else - return sprintf(buf, "0x%016lx\n", ne->tpool->pool[0]); + tm = tp[0]; #endif + spin_unlock_irqrestore(&hpsb_tlabel_lock, flags); + + return sprintf(buf, "0x%016llx\n", tm); } static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL); +#endif /* HPSB_DEBUG_TLABELS */ static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) @@ -461,9 +471,10 @@ static struct device_attribute *const fw_ne_attrs[] = { &dev_attr_ne_vendor_id, &dev_attr_ne_nodeid, &dev_attr_bus_options, +#ifdef HPSB_DEBUG_TLABELS &dev_attr_tlabels_free, - &dev_attr_tlabels_allocations, &dev_attr_tlabels_mask, +#endif }; @@ -782,8 +793,6 @@ static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr if (!ne) return NULL; - ne->tpool = &host->tpool[nodeid & NODE_MASK]; - ne->host = host; ne->nodeid = nodeid; ne->generation = generation; diff --git a/drivers/ieee1394/nodemgr.h b/drivers/ieee1394/nodemgr.h index f649c9d..0e1e7d9 100644 --- a/drivers/ieee1394/nodemgr.h +++ b/drivers/ieee1394/nodemgr.h @@ -107,7 +107,6 @@ struct node_entry { const char *vendor_oui; u32 capabilities; - struct hpsb_tlabel_pool *tpool; struct device device; struct class_device class_dev; |
