/* Main cleanup function. */
static void b43_destroy_dmaring(struct b43_dmaring *ring,
const char *ringname)
{
if (!ring)
return;
#ifdef CPTCFG_B43_DEBUG
{
/* Print some statistics. */
u64 failed_packets = ring->nr_failed_tx_packets;
u64 succeed_packets = ring->nr_succeed_tx_packets;
u64 nr_packets = failed_packets + succeed_packets;
u64 permille_failed = 0, average_tries = 0;
if (nr_packets)
permille_failed = divide(failed_packets * 1000, nr_packets);
if (nr_packets)
average_tries = divide(ring->nr_total_packet_tries * 100, nr_packets);
b43dbg(ring->dev->wl, "DMA-%u %s: "
"Used slots %d/%d, Failed frames %llu/%llu = %llu.%01llu%%, "
"Average tries %llu.%02llu\n",
(unsigned int)(ring->type), ringname,
ring->max_used_slots,
ring->nr_slots,
(unsigned long long)failed_packets,
(unsigned long long)nr_packets,
(unsigned long long)divide(permille_failed, 10),
(unsigned long long)modulo(permille_failed, 10),
(unsigned long long)divide(average_tries, 100),
(unsigned long long)modulo(average_tries, 100));
}
#endif /* DEBUG */
/* Device IRQs are disabled prior entering this function,
* so no need to take care of concurrency with rx handler stuff.
*/
dmacontroller_cleanup(ring);
free_all_descbuffers(ring);
free_ringmemory(ring);
kfree(ring->txhdr_cache);
kfree(ring->meta);
kfree(ring);
}
static void b43_destroy_dmaring(struct b43_dmaring *ring,
const char *ringname)
{
if (!ring)
return;
#ifdef CONFIG_B43_DEBUG
{
u64 failed_packets = ring->nr_failed_tx_packets;
u64 succeed_packets = ring->nr_succeed_tx_packets;
u64 nr_packets = failed_packets + succeed_packets;
u64 permille_failed = 0, average_tries = 0;
if (nr_packets)
permille_failed = divide(failed_packets * 1000, nr_packets);
if (nr_packets)
average_tries = divide(ring->nr_total_packet_tries * 100, nr_packets);
b43dbg(ring->dev->wl, "DMA-%u %s: "
"Used slots %d/%d, Failed frames %llu/%llu = %llu.%01llu%%, "
"Average tries %llu.%02llu\n",
(unsigned int)(ring->type), ringname,
ring->max_used_slots,
ring->nr_slots,
(unsigned long long)failed_packets,
(unsigned long long)nr_packets,
(unsigned long long)divide(permille_failed, 10),
(unsigned long long)modulo(permille_failed, 10),
(unsigned long long)divide(average_tries, 100),
(unsigned long long)modulo(average_tries, 100));
}
#endif
dmacontroller_cleanup(ring);
free_all_descbuffers(ring);
free_ringmemory(ring);
kfree(ring->txhdr_cache);
kfree(ring->meta);
kfree(ring);
}
/* Main initialization function. */
static
struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
int controller_index,
int for_tx,
enum b43_dmatype type)
{
struct b43_dmaring *ring;
int i, err;
dma_addr_t dma_test;
ring = kzalloc(sizeof(*ring), GFP_KERNEL);
if (!ring)
goto out;
ring->nr_slots = B43_RXRING_SLOTS;
if (for_tx)
ring->nr_slots = B43_TXRING_SLOTS;
ring->meta = kcalloc(ring->nr_slots, sizeof(struct b43_dmadesc_meta),
GFP_KERNEL);
if (!ring->meta)
goto err_kfree_ring;
for (i = 0; i < ring->nr_slots; i++)
ring->meta->skb = B43_DMA_PTR_POISON;
ring->type = type;
ring->dev = dev;
ring->mmio_base = b43_dmacontroller_base(type, controller_index);
ring->index = controller_index;
if (type == B43_DMA_64BIT)
ring->ops = &dma64_ops;
else
ring->ops = &dma32_ops;
if (for_tx) {
ring->tx = true;
ring->current_slot = -1;
} else {
if (ring->index == 0) {
switch (dev->fw.hdr_format) {
case B43_FW_HDR_598:
ring->rx_buffersize = B43_DMA0_RX_FW598_BUFSIZE;
ring->frameoffset = B43_DMA0_RX_FW598_FO;
break;
case B43_FW_HDR_410:
case B43_FW_HDR_351:
ring->rx_buffersize = B43_DMA0_RX_FW351_BUFSIZE;
ring->frameoffset = B43_DMA0_RX_FW351_FO;
break;
}
} else
B43_WARN_ON(1);
}
#ifdef CPTCFG_B43_DEBUG
ring->last_injected_overflow = jiffies;
#endif
if (for_tx) {
/* Assumption: B43_TXRING_SLOTS can be divided by TX_SLOTS_PER_FRAME */
BUILD_BUG_ON(B43_TXRING_SLOTS % TX_SLOTS_PER_FRAME != 0);
ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME,
b43_txhdr_size(dev),
GFP_KERNEL);
if (!ring->txhdr_cache)
goto err_kfree_meta;
/* test for ability to dma to txhdr_cache */
dma_test = dma_map_single(dev->dev->dma_dev,
ring->txhdr_cache,
b43_txhdr_size(dev),
DMA_TO_DEVICE);
if (b43_dma_mapping_error(ring, dma_test,
b43_txhdr_size(dev), 1)) {
/* ugh realloc */
kfree(ring->txhdr_cache);
ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME,
b43_txhdr_size(dev),
GFP_KERNEL | GFP_DMA);
if (!ring->txhdr_cache)
goto err_kfree_meta;
dma_test = dma_map_single(dev->dev->dma_dev,
ring->txhdr_cache,
b43_txhdr_size(dev),
DMA_TO_DEVICE);
if (b43_dma_mapping_error(ring, dma_test,
b43_txhdr_size(dev), 1)) {
b43err(dev->wl,
"TXHDR DMA allocation failed\n");
goto err_kfree_txhdr_cache;
}
}
dma_unmap_single(dev->dev->dma_dev,
dma_test, b43_txhdr_size(dev),
DMA_TO_DEVICE);
}
err = alloc_ringmemory(ring);
if (err)
goto err_kfree_txhdr_cache;
err = dmacontroller_setup(ring);
if (err)
goto err_free_ringmemory;
out:
return ring;
err_free_ringmemory:
free_ringmemory(ring);
err_kfree_txhdr_cache:
kfree(ring->txhdr_cache);
err_kfree_meta:
kfree(ring->meta);
err_kfree_ring:
kfree(ring);
ring = NULL;
goto out;
}