diff options
Diffstat (limited to 'drivers/dma/ioat/dma_v3.c')
-rw-r--r-- | drivers/dma/ioat/dma_v3.c | 117 |
1 files changed, 35 insertions, 82 deletions
diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index 6740e31..8b573fa 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -260,8 +260,8 @@ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete) struct ioat_chan_common *chan = &ioat->base; struct ioat_ring_ent *desc; bool seen_current = false; + int idx = ioat->tail, i; u16 active; - int i; dev_dbg(to_dev(chan), "%s: head: %#x tail: %#x issued: %#x\n", __func__, ioat->head, ioat->tail, ioat->issued); @@ -270,13 +270,14 @@ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete) for (i = 0; i < active && !seen_current; i++) { struct dma_async_tx_descriptor *tx; - prefetch(ioat2_get_ring_ent(ioat, ioat->tail + i + 1)); - desc = ioat2_get_ring_ent(ioat, ioat->tail + i); + smp_read_barrier_depends(); + prefetch(ioat2_get_ring_ent(ioat, idx + i + 1)); + desc = ioat2_get_ring_ent(ioat, idx + i); dump_desc_dbg(ioat, desc); tx = &desc->txd; if (tx->cookie) { chan->completed_cookie = tx->cookie; - ioat3_dma_unmap(ioat, desc, ioat->tail + i); + ioat3_dma_unmap(ioat, desc, idx + i); tx->cookie = 0; if (tx->callback) { tx->callback(tx->callback_param); @@ -293,69 +294,30 @@ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete) i++; } } - ioat->tail += i; + smp_mb(); /* finish all descriptor reads before incrementing tail */ + ioat->tail = idx + i; BUG_ON(active && !seen_current); /* no active descs have written a completion? */ chan->last_completion = phys_complete; - active = ioat2_ring_active(ioat); - if (active == 0) { + if (active - i == 0) { dev_dbg(to_dev(chan), "%s: cancel completion timeout\n", __func__); clear_bit(IOAT_COMPLETION_PENDING, &chan->state); mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); } /* 5 microsecond delay per pending descriptor */ - writew(min((5 * active), IOAT_INTRDELAY_MASK), + writew(min((5 * (active - i)), IOAT_INTRDELAY_MASK), chan->device->reg_base + IOAT_INTRDELAY_OFFSET); } -/* try to cleanup, but yield (via spin_trylock) to incoming submissions - * with the expectation that we will immediately poll again shortly - */ -static void ioat3_cleanup_poll(struct ioat2_dma_chan *ioat) +static void ioat3_cleanup(struct ioat2_dma_chan *ioat) { struct ioat_chan_common *chan = &ioat->base; unsigned long phys_complete; - prefetch(chan->completion); - - if (!spin_trylock_bh(&chan->cleanup_lock)) - return; - - if (!ioat_cleanup_preamble(chan, &phys_complete)) { - spin_unlock_bh(&chan->cleanup_lock); - return; - } - - if (!spin_trylock_bh(&ioat->ring_lock)) { - spin_unlock_bh(&chan->cleanup_lock); - return; - } - - __cleanup(ioat, phys_complete); - - spin_unlock_bh(&ioat->ring_lock); - spin_unlock_bh(&chan->cleanup_lock); -} - -/* run cleanup now because we already delayed the interrupt via INTRDELAY */ -static void ioat3_cleanup_sync(struct ioat2_dma_chan *ioat) -{ - struct ioat_chan_common *chan = &ioat->base; - unsigned long phys_complete; - - prefetch(chan->completion); - spin_lock_bh(&chan->cleanup_lock); - if (!ioat_cleanup_preamble(chan, &phys_complete)) { - spin_unlock_bh(&chan->cleanup_lock); - return; - } - spin_lock_bh(&ioat->ring_lock); - - __cleanup(ioat, phys_complete); - - spin_unlock_bh(&ioat->ring_lock); + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); spin_unlock_bh(&chan->cleanup_lock); } @@ -363,7 +325,7 @@ static void ioat3_cleanup_event(unsigned long data) { struct ioat2_dma_chan *ioat = to_ioat2_chan((void *) data); - ioat3_cleanup_sync(ioat); + ioat3_cleanup(ioat); writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); } @@ -384,12 +346,10 @@ static void ioat3_timer_event(unsigned long data) struct ioat2_dma_chan *ioat = to_ioat2_chan((void *) data); struct ioat_chan_common *chan = &ioat->base; - spin_lock_bh(&chan->cleanup_lock); if (test_bit(IOAT_COMPLETION_PENDING, &chan->state)) { unsigned long phys_complete; u64 status; - spin_lock_bh(&ioat->ring_lock); status = ioat_chansts(chan); /* when halted due to errors check for channel @@ -408,26 +368,31 @@ static void ioat3_timer_event(unsigned long data) * acknowledged a pending completion once, then be more * forceful with a restart */ + spin_lock_bh(&chan->cleanup_lock); if (ioat_cleanup_preamble(chan, &phys_complete)) __cleanup(ioat, phys_complete); - else if (test_bit(IOAT_COMPLETION_ACK, &chan->state)) + else if (test_bit(IOAT_COMPLETION_ACK, &chan->state)) { + spin_lock_bh(&ioat->prep_lock); ioat3_restart_channel(ioat); - else { + spin_unlock_bh(&ioat->prep_lock); + } else { set_bit(IOAT_COMPLETION_ACK, &chan->state); mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); } - spin_unlock_bh(&ioat->ring_lock); + spin_unlock_bh(&chan->cleanup_lock); } else { u16 active; /* if the ring is idle, empty, and oversized try to step * down the size */ - spin_lock_bh(&ioat->ring_lock); + spin_lock_bh(&chan->cleanup_lock); + spin_lock_bh(&ioat->prep_lock); active = ioat2_ring_active(ioat); if (active == 0 && ioat->alloc_order > ioat_get_alloc_order()) reshape_ring(ioat, ioat->alloc_order-1); - spin_unlock_bh(&ioat->ring_lock); + spin_unlock_bh(&ioat->prep_lock); + spin_unlock_bh(&chan->cleanup_lock); /* keep shrinking until we get back to our minimum * default size @@ -435,7 +400,6 @@ static void ioat3_timer_event(unsigned long data) if (ioat->alloc_order > ioat_get_alloc_order()) mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); } - spin_unlock_bh(&chan->cleanup_lock); } static enum dma_status @@ -447,7 +411,7 @@ ioat3_is_complete(struct dma_chan *c, dma_cookie_t cookie, if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS) return DMA_SUCCESS; - ioat3_cleanup_poll(ioat); + ioat3_cleanup(ioat); return ioat_is_complete(c, cookie, done, used); } @@ -460,15 +424,12 @@ ioat3_prep_memset_lock(struct dma_chan *c, dma_addr_t dest, int value, struct ioat_ring_ent *desc; size_t total_len = len; struct ioat_fill_descriptor *fill; - int num_descs; u64 src_data = (0x0101010101010101ULL) * (value & 0xff); - u16 idx; - int i; + int num_descs, idx, i; num_descs = ioat2_xferlen_to_descs(ioat, len); - if (likely(num_descs) && - ioat2_alloc_and_lock(&idx, ioat, num_descs) == 0) - /* pass */; + if (likely(num_descs) && ioat2_check_space_lock(ioat, num_descs) == 0) + idx = ioat->head; else return NULL; i = 0; @@ -513,11 +474,8 @@ __ioat3_prep_xor_lock(struct dma_chan *c, enum sum_check_flags *result, struct ioat_xor_descriptor *xor; struct ioat_xor_ext_descriptor *xor_ex = NULL; struct ioat_dma_descriptor *hw; + int num_descs, with_ext, idx, i; u32 offset = 0; - int num_descs; - int with_ext; - int i; - u16 idx; u8 op = result ? IOAT_OP_XOR_VAL : IOAT_OP_XOR; BUG_ON(src_cnt < 2); @@ -537,9 +495,8 @@ __ioat3_prep_xor_lock(struct dma_chan *c, enum sum_check_flags *result, * (legacy) descriptor to ensure all completion writes arrive in * order. */ - if (likely(num_descs) && - ioat2_alloc_and_lock(&idx, ioat, num_descs+1) == 0) - /* pass */; + if (likely(num_descs) && ioat2_check_space_lock(ioat, num_descs+1) == 0) + idx = ioat->head; else return NULL; i = 0; @@ -657,11 +614,8 @@ __ioat3_prep_pq_lock(struct dma_chan *c, enum sum_check_flags *result, struct ioat_pq_ext_descriptor *pq_ex = NULL; struct ioat_dma_descriptor *hw; u32 offset = 0; - int num_descs; - int with_ext; - int i, s; - u16 idx; u8 op = result ? IOAT_OP_PQ_VAL : IOAT_OP_PQ; + int i, s, idx, with_ext, num_descs; dev_dbg(to_dev(chan), "%s\n", __func__); /* the engine requires at least two sources (we provide @@ -687,8 +641,8 @@ __ioat3_prep_pq_lock(struct dma_chan *c, enum sum_check_flags *result, * order. */ if (likely(num_descs) && - ioat2_alloc_and_lock(&idx, ioat, num_descs+1) == 0) - /* pass */; + ioat2_check_space_lock(ioat, num_descs+1) == 0) + idx = ioat->head; else return NULL; i = 0; @@ -851,10 +805,9 @@ ioat3_prep_interrupt_lock(struct dma_chan *c, unsigned long flags) struct ioat2_dma_chan *ioat = to_ioat2_chan(c); struct ioat_ring_ent *desc; struct ioat_dma_descriptor *hw; - u16 idx; - if (ioat2_alloc_and_lock(&idx, ioat, 1) == 0) - desc = ioat2_get_ring_ent(ioat, idx); + if (ioat2_check_space_lock(ioat, 1) == 0) + desc = ioat2_get_ring_ent(ioat, ioat->head); else return NULL; |