diff options
| -rw-r--r-- | drivers/crypto/talitos.c | 141 |
1 files changed, 58 insertions, 83 deletions
diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c index b1a651c6182..5013a2dd47e 100644 --- a/drivers/crypto/talitos.c +++ b/drivers/crypto/talitos.c @@ -86,6 +86,25 @@ struct talitos_request { void *context; }; +/* per-channel fifo management */ +struct talitos_channel { + /* request fifo */ + struct talitos_request *fifo; + + /* number of requests pending in channel h/w fifo */ + atomic_t submit_count ____cacheline_aligned; + + /* request submission (head) lock */ + spinlock_t head_lock ____cacheline_aligned; + /* index to next free descriptor request */ + int head; + + /* request release (tail) lock */ + spinlock_t tail_lock ____cacheline_aligned; + /* index to next in-progress/done descriptor request */ + int tail; +}; + struct talitos_private { struct device *dev; struct of_device *ofdev; @@ -101,15 +120,6 @@ struct talitos_private { /* SEC Compatibility info */ unsigned long features; - /* next channel to be assigned next incoming descriptor */ - atomic_t last_chan; - - /* per-channel number of requests pending in channel h/w fifo */ - atomic_t *submit_count; - - /* per-channel request fifo */ - struct talitos_request **fifo; - /* * length of the request fifo * fifo_len is chfifo_len rounded up to next power of 2 @@ -117,15 +127,10 @@ struct talitos_private { */ unsigned int fifo_len; - /* per-channel index to next free descriptor request */ - int *head; - - /* per-channel index to next in-progress/done descriptor request */ - int *tail; + struct talitos_channel *chan; - /* per-channel request submission (head) and release (tail) locks */ - spinlock_t *head_lock; - spinlock_t *tail_lock; + /* next channel to be assigned next incoming descriptor */ + atomic_t last_chan ____cacheline_aligned; /* request callback tasklet */ struct tasklet_struct done_task; @@ -282,16 +287,16 @@ static int talitos_submit(struct device *dev, struct talitos_desc *desc, /* emulate SEC's round-robin channel fifo polling scheme */ ch = atomic_inc_return(&priv->last_chan) & (priv->num_channels - 1); - spin_lock_irqsave(&priv->head_lock[ch], flags); + spin_lock_irqsave(&priv->chan[ch].head_lock, flags); - if (!atomic_inc_not_zero(&priv->submit_count[ch])) { + if (!atomic_inc_not_zero(&priv->chan[ch].submit_count)) { /* h/w fifo is full */ - spin_unlock_irqrestore(&priv->head_lock[ch], flags); + spin_unlock_irqrestore(&priv->chan[ch].head_lock, flags); return -EAGAIN; } - head = priv->head[ch]; - request = &priv->fifo[ch][head]; + head = priv->chan[ch].head; + request = &priv->chan[ch].fifo[head]; /* map descriptor and save caller data */ request->dma_desc = dma_map_single(dev, desc, sizeof(*desc), @@ -300,7 +305,7 @@ static int talitos_submit(struct device *dev, struct talitos_desc *desc, request->context = context; /* increment fifo head */ - priv->head[ch] = (priv->head[ch] + 1) & (priv->fifo_len - 1); + priv->chan[ch].head = (priv->chan[ch].head + 1) & (priv->fifo_len - 1); smp_wmb(); request->desc = desc; @@ -309,7 +314,7 @@ static int talitos_submit(struct device *dev, struct talitos_desc *desc, wmb(); out_be32(priv->reg + TALITOS_FF_LO(ch), request->dma_desc); - spin_unlock_irqrestore(&priv->head_lock[ch], flags); + spin_unlock_irqrestore(&priv->chan[ch].head_lock, flags); return -EINPROGRESS; } @@ -324,11 +329,11 @@ static void flush_channel(struct device *dev, int ch, int error, int reset_ch) unsigned long flags; int tail, status; - spin_lock_irqsave(&priv->tail_lock[ch], flags); + spin_lock_irqsave(&priv->chan[ch].tail_lock, flags); - tail = priv->tail[ch]; - while (priv->fifo[ch][tail].desc) { - request = &priv->fifo[ch][tail]; + tail = priv->chan[ch].tail; + while (priv->chan[ch].fifo[tail].desc) { + request = &priv->chan[ch].fifo[tail]; /* descriptors with their done bits set don't get the error */ rmb(); @@ -354,22 +359,22 @@ static void flush_channel(struct device *dev, int ch, int error, int reset_ch) request->desc = NULL; /* increment fifo tail */ - priv->tail[ch] = (tail + 1) & (priv->fifo_len - 1); + priv->chan[ch].tail = (tail + 1) & (priv->fifo_len - 1); - spin_unlock_irqrestore(&priv->tail_lock[ch], flags); + spin_unlock_irqrestore(&priv->chan[ch].tail_lock, flags); - atomic_dec(&priv->submit_count[ch]); + atomic_dec(&priv->chan[ch].submit_count); saved_req.callback(dev, saved_req.desc, saved_req.context, status); /* channel may resume processing in single desc error case */ if (error && !reset_ch && status == error) return; - spin_lock_irqsave(&priv->tail_lock[ch], flags); - tail = priv->tail[ch]; + spin_lock_irqsave(&priv->chan[ch].tail_lock, flags); + tail = priv->chan[ch].tail; } - spin_unlock_irqrestore(&priv->tail_lock[ch], flags); + spin_unlock_irqrestore(&priv->chan[ch].tail_lock, flags); } /* @@ -397,20 +402,20 @@ static void talitos_done(unsigned long data) static struct talitos_desc *current_desc(struct device *dev, int ch) { struct talitos_private *priv = dev_get_drvdata(dev); - int tail = priv->tail[ch]; + int tail = priv->chan[ch].tail; dma_addr_t cur_desc; cur_desc = in_be32(priv->reg + TALITOS_CDPR_LO(ch)); - while (priv->fifo[ch][tail].dma_desc != cur_desc) { + while (priv->chan[ch].fifo[tail].dma_desc != cur_desc) { tail = (tail + 1) & (priv->fifo_len - 1); - if (tail == priv->tail[ch]) { + if (tail == priv->chan[ch].tail) { dev_err(dev, "couldn't locate current descriptor\n"); return NULL; } } - return priv->fifo[ch][tail].desc; + return priv->chan[ch].fifo[tail].desc; } /* @@ -1740,17 +1745,11 @@ static int talitos_remove(struct of_device *ofdev) if (hw_supports(dev, DESC_HDR_SEL0_RNG)) talitos_unregister_rng(dev); - kfree(priv->submit_count); - kfree(priv->tail); - kfree(priv->head); - - if (priv->fifo) - for (i = 0; i < priv->num_channels; i++) - kfree(priv->fifo[i]); + for (i = 0; i < priv->num_channels; i++) + if (priv->chan[i].fifo) + kfree(priv->chan[i].fifo); - kfree(priv->fifo); - kfree(priv->head_lock); - kfree(priv->tail_lock); + kfree(priv->chan); if (priv->irq != NO_IRQ) { free_irq(priv->irq, dev); @@ -1870,58 +1869,34 @@ static int talitos_probe(struct of_device *ofdev, if (of_device_is_compatible(np, "fsl,sec2.1")) priv->features |= TALITOS_FTR_HW_AUTH_CHECK; - priv->head_lock = kmalloc(sizeof(spinlock_t) * priv->num_channels, - GFP_KERNEL); - priv->tail_lock = kmalloc(sizeof(spinlock_t) * priv->num_channels, - GFP_KERNEL); - if (!priv->head_lock || !priv->tail_lock) { - dev_err(dev, "failed to allocate fifo locks\n"); + priv->chan = kzalloc(sizeof(struct talitos_channel) * + priv->num_channels, GFP_KERNEL); + if (!priv->chan) { + dev_err(dev, "failed to allocate channel management space\n"); err = -ENOMEM; goto err_out; } for (i = 0; i < priv->num_channels; i++) { - spin_lock_init(&priv->head_lock[i]); - spin_lock_init(&priv->tail_lock[i]); - } - - priv->fifo = kmalloc(sizeof(struct talitos_request *) * - priv->num_channels, GFP_KERNEL); - if (!priv->fifo) { - dev_err(dev, "failed to allocate request fifo\n"); - err = -ENOMEM; - goto err_out; + spin_lock_init(&priv->chan[i].head_lock); + spin_lock_init(&priv->chan[i].tail_lock); } priv->fifo_len = roundup_pow_of_two(priv->chfifo_len); for (i = 0; i < priv->num_channels; i++) { - priv->fifo[i] = kzalloc(sizeof(struct talitos_request) * - priv->fifo_len, GFP_KERNEL); - if (!priv->fifo[i]) { + priv->chan[i].fifo = kzalloc(sizeof(struct talitos_request) * + priv->fifo_len, GFP_KERNEL); + if (!priv->chan[i].fifo) { dev_err(dev, "failed to allocate request fifo %d\n", i); err = -ENOMEM; goto err_out; } } - priv->submit_count = kmalloc(sizeof(atomic_t) * priv->num_channels, - GFP_KERNEL); - if (!priv->submit_count) { - dev_err(dev, "failed to allocate fifo submit count space\n"); - err = -ENOMEM; - goto err_out; - } for (i = 0; i < priv->num_channels; i++) - atomic_set(&priv->submit_count[i], -(priv->chfifo_len - 1)); - - priv->head = kzalloc(sizeof(int) * priv->num_channels, GFP_KERNEL); - priv->tail = kzalloc(sizeof(int) * priv->num_channels, GFP_KERNEL); - if (!priv->head || !priv->tail) { - dev_err(dev, "failed to allocate request index space\n"); - err = -ENOMEM; - goto err_out; - } + atomic_set(&priv->chan[i].submit_count, + -(priv->chfifo_len - 1)); /* reset and initialize the h/w */ err = init_device(dev); |