diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/ioat/Makefile | 2 | ||||
| -rw-r--r-- | drivers/dma/ioat/dma.c | 874 | ||||
| -rw-r--r-- | drivers/dma/ioat/dma.h | 50 | ||||
| -rw-r--r-- | drivers/dma/ioat/dma_v2.c | 750 | ||||
| -rw-r--r-- | drivers/dma/ioat/dma_v2.h | 131 | ||||
| -rw-r--r-- | drivers/dma/ioat/pci.c | 1 |
6 files changed, 1122 insertions, 686 deletions
diff --git a/drivers/dma/ioat/Makefile b/drivers/dma/ioat/Makefile index 2ce3d3a4270b..205a639e84df 100644 --- a/drivers/dma/ioat/Makefile +++ b/drivers/dma/ioat/Makefile @@ -1,2 +1,2 @@ obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o -ioatdma-objs := pci.o dma.o dca.o +ioatdma-objs := pci.o dma.o dma_v2.o dca.o diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 2e81e0c76e61..64b4d75059aa 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -38,28 +38,14 @@ #include "registers.h" #include "hw.h" -static int ioat_pending_level = 4; +int ioat_pending_level = 4; module_param(ioat_pending_level, int, 0644); MODULE_PARM_DESC(ioat_pending_level, "high-water mark for pushing ioat descriptors (default: 4)"); -static void ioat_dma_chan_reset_part2(struct work_struct *work); -static void ioat_dma_chan_watchdog(struct work_struct *work); - /* internal functions */ -static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat); -static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat); - -static struct ioat_desc_sw * -ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat); -static struct ioat_desc_sw * -ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat); - -static inline struct ioat_chan_common * -ioat_chan_by_index(struct ioatdma_device *device, int index) -{ - return device->idx[index]; -} +static void ioat1_cleanup(struct ioat_dma_chan *ioat); +static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat); /** * ioat_dma_do_interrupt - handler used for single vector interrupt mode @@ -108,18 +94,38 @@ static irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data) return IRQ_HANDLED; } -static void ioat_dma_cleanup_tasklet(unsigned long data); +static void ioat1_cleanup_tasklet(unsigned long data); + +/* common channel initialization */ +void ioat_init_channel(struct ioatdma_device *device, + struct ioat_chan_common *chan, int idx, + work_func_t work_fn, void (*tasklet)(unsigned long), + unsigned long tasklet_data) +{ + struct dma_device *dma = &device->common; + + chan->device = device; + chan->reg_base = device->reg_base + (0x80 * (idx + 1)); + INIT_DELAYED_WORK(&chan->work, work_fn); + spin_lock_init(&chan->cleanup_lock); + chan->common.device = dma; + list_add_tail(&chan->common.device_node, &dma->channels); + device->idx[idx] = chan; + tasklet_init(&chan->cleanup_task, tasklet, tasklet_data); + tasklet_disable(&chan->cleanup_task); +} + +static void ioat1_reset_part2(struct work_struct *work); /** - * ioat_dma_enumerate_channels - find and initialize the device's channels + * ioat1_dma_enumerate_channels - find and initialize the device's channels * @device: the device to be enumerated */ -static int ioat_dma_enumerate_channels(struct ioatdma_device *device) +static int ioat1_enumerate_channels(struct ioatdma_device *device) { u8 xfercap_scale; u32 xfercap; int i; - struct ioat_chan_common *chan; struct ioat_dma_chan *ioat; struct device *dev = &device->pdev->dev; struct dma_device *dma = &device->common; @@ -135,31 +141,20 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device) #endif for (i = 0; i < dma->chancnt; i++) { ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL); - if (!ioat) { - dma->chancnt = i; + if (!ioat) break; - } - chan = &ioat->base; - chan->device = device; - chan->reg_base = device->reg_base + (0x80 * (i + 1)); + ioat_init_channel(device, &ioat->base, i, + ioat1_reset_part2, + ioat1_cleanup_tasklet, + (unsigned long) ioat); ioat->xfercap = xfercap; - ioat->desccount = 0; - INIT_DELAYED_WORK(&chan->work, ioat_dma_chan_reset_part2); - spin_lock_init(&chan->cleanup_lock); spin_lock_init(&ioat->desc_lock); INIT_LIST_HEAD(&ioat->free_desc); INIT_LIST_HEAD(&ioat->used_desc); - /* This should be made common somewhere in dmaengine.c */ - chan->common.device = &device->common; - list_add_tail(&chan->common.device_node, &dma->channels); - device->idx[i] = chan; - tasklet_init(&chan->cleanup_task, - ioat_dma_cleanup_tasklet, - (unsigned long) ioat); - tasklet_disable(&chan->cleanup_task); } - return dma->chancnt; + dma->chancnt = i; + return i; } /** @@ -187,35 +182,16 @@ static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan) } } -static inline void -__ioat2_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat) -{ - void __iomem *reg_base = ioat->base.reg_base; - - ioat->pending = 0; - writew(ioat->dmacount, reg_base + IOAT_CHAN_DMACOUNT_OFFSET); -} - -static void ioat2_dma_memcpy_issue_pending(struct dma_chan *chan) -{ - struct ioat_dma_chan *ioat = to_ioat_chan(chan); - - if (ioat->pending > 0) { - spin_lock_bh(&ioat->desc_lock); - __ioat2_dma_memcpy_issue_pending(ioat); - spin_unlock_bh(&ioat->desc_lock); - } -} - - /** - * ioat_dma_chan_reset_part2 - reinit the channel after a reset + * ioat1_reset_part2 - reinit the channel after a reset */ -static void ioat_dma_chan_reset_part2(struct work_struct *work) +static void ioat1_reset_part2(struct work_struct *work) { struct ioat_chan_common *chan; struct ioat_dma_chan *ioat; struct ioat_desc_sw *desc; + int dmacount; + bool start_null = false; chan = container_of(work, struct ioat_chan_common, work.work); ioat = container_of(chan, struct ioat_dma_chan, base); @@ -226,26 +202,22 @@ static void ioat_dma_chan_reset_part2(struct work_struct *work) chan->completion_virt->high = 0; ioat->pending = 0; - /* - * count the descriptors waiting, and be sure to do it - * right for both the CB1 line and the CB2 ring - */ - ioat->dmacount = 0; + /* count the descriptors waiting */ + dmacount = 0; if (ioat->used_desc.prev) { desc = to_ioat_desc(ioat->used_desc.prev); do { - ioat->dmacount++; + dmacount++; desc = to_ioat_desc(desc->node.next); } while (&desc->node != ioat->used_desc.next); } - /* - * write the new starting descriptor address - * this puts channel engine into ARMED state - */ - desc = to_ioat_desc(ioat->used_desc.prev); - switch (chan->device->version) { - case IOAT_VER_1_2: + if (dmacount) { + /* + * write the new starting descriptor address + * this puts channel engine into ARMED state + */ + desc = to_ioat_desc(ioat->used_desc.prev); writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); writel(((u64) desc->txd.phys) >> 32, @@ -253,32 +225,24 @@ static void ioat_dma_chan_reset_part2(struct work_struct *work) writeb(IOAT_CHANCMD_START, chan->reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); - break; - case IOAT_VER_2_0: - writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->txd.phys) >> 32, - chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); - - /* tell the engine to go with what's left to be done */ - writew(ioat->dmacount, - chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET); + } else + start_null = true; + spin_unlock_bh(&ioat->desc_lock); + spin_unlock_bh(&chan->cleanup_lock); - break; - } dev_err(to_dev(chan), "chan%d reset - %d descs waiting, %d total desc\n", - chan_num(chan), ioat->dmacount, ioat->desccount); + chan_num(chan), dmacount, ioat->desccount); - spin_unlock_bh(&ioat->desc_lock); - spin_unlock_bh(&chan->cleanup_lock); + if (start_null) + ioat1_dma_start_null_desc(ioat); } /** - * ioat_dma_reset_channel - restart a channel + * ioat1_reset_channel - restart a channel * @ioat: IOAT DMA channel handle */ -static void ioat_dma_reset_channel(struct ioat_dma_chan *ioat) +static void ioat1_reset_channel(struct ioat_dma_chan *ioat) { struct ioat_chan_common *chan = &ioat->base; void __iomem *reg_base = chan->reg_base; @@ -316,9 +280,9 @@ static void ioat_dma_reset_channel(struct ioat_dma_chan *ioat) } /** - * ioat_dma_chan_watchdog - watch for stuck channels + * ioat1_chan_watchdog - watch for stuck channels */ -static void ioat_dma_chan_watchdog(struct work_struct *work) +static void ioat1_chan_watchdog(struct work_struct *work) { struct ioatdma_device *device = container_of(work, struct ioatdma_device, work.work); @@ -339,16 +303,15 @@ static void ioat_dma_chan_watchdog(struct work_struct *work) chan = ioat_chan_by_index(device, i); ioat = container_of(chan, struct ioat_dma_chan, base); - if (chan->device->version == IOAT_VER_1_2 - /* have we started processing anything yet */ - && chan->last_completion - /* have we completed any since last watchdog cycle? */ + if (/* have we started processing anything yet */ + chan->last_completion + /* have we completed any since last watchdog cycle? */ && (chan->last_completion == chan->watchdog_completion) - /* has TCP stuck on one cookie since last watchdog? */ + /* has TCP stuck on one cookie since last watchdog? */ && (chan->watchdog_tcp_cookie == chan->watchdog_last_tcp_cookie) && (chan->watchdog_tcp_cookie != chan->completed_cookie) - /* is there something in the chain to be processed? */ - /* CB1 chain always has at least the last one processed */ + /* is there something in the chain to be processed? */ + /* CB1 chain always has at least the last one processed */ && (ioat->used_desc.prev != ioat->used_desc.next) && ioat->pending == 0) { @@ -387,34 +350,15 @@ static void ioat_dma_chan_watchdog(struct work_struct *work) chan->completion_virt->low = completion_hw.low; chan->completion_virt->high = completion_hw.high; } else { - ioat_dma_reset_channel(ioat); + ioat1_reset_channel(ioat); chan->watchdog_completion = 0; chan->last_compl_desc_addr_hw = 0; } - - /* - * for version 2.0 if there are descriptors yet to be processed - * and the last completed hasn't changed since the last watchdog - * if they haven't hit the pending level - * issue the pending to push them through - * else - * try resetting the channel - */ - } else if (chan->device->version == IOAT_VER_2_0 - && ioat->used_desc.prev - && chan->last_completion - && chan->last_completion == chan->watchdog_completion) { - - if (ioat->pending < ioat_pending_level) - ioat2_dma_memcpy_issue_pending(&chan->common); - else { - ioat_dma_reset_channel(ioat); - chan->watchdog_completion = 0; - } } else { chan->last_compl_desc_addr_hw = 0; chan->watchdog_completion = chan->last_completion; } + chan->watchdog_last_tcp_cookie = chan->watchdog_tcp_cookie; } @@ -447,7 +391,6 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) chain_tail->hw->next = first->txd.phys; list_splice_tail_init(&tx->tx_list, &ioat->used_desc); - ioat->dmacount += desc->tx_cnt; ioat->pending += desc->tx_cnt; if (ioat->pending >= ioat_pending_level) __ioat1_dma_memcpy_issue_pending(ioat); @@ -456,92 +399,6 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) return cookie; } -static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) -{ - struct ioat_dma_chan *ioat = to_ioat_chan(tx->chan); - struct ioat_desc_sw *first = tx_to_ioat_desc(tx); - struct ioat_desc_sw *new; - struct ioat_dma_descriptor *hw; - dma_cookie_t cookie; - u32 copy; - size_t len; - dma_addr_t src, dst; - unsigned long orig_flags; - unsigned int desc_count = 0; - - /* src and dest and len are stored in the initial descriptor */ - len = first->len; - src = first->src; - dst = first->dst; - orig_flags = first->txd.flags; - new = first; - - /* - * ioat->desc_lock is still in force in version 2 path - * it gets unlocked at end of this function - */ - do { - copy = min_t(size_t, len, ioat->xfercap); - - async_tx_ack(&new->txd); - - hw = new->hw; - hw->size = copy; - hw->ctl = 0; - hw->src_addr = src; - hw->dst_addr = dst; - - len -= copy; - dst += copy; - src += copy; - desc_count++; - } while (len && (new = ioat2_dma_get_next_descriptor(ioat))); - - if (!new) { - dev_err(to_dev(&ioat->base), "tx submit failed\n"); - spin_unlock_bh(&ioat->desc_lock); - return -ENOMEM; - } - - hw->ctl_f.compl_write = 1; - if (first->txd.callback) { - hw->ctl_f.int_en = 1; - if (first != new) { - /* move callback into to last desc */ - new->txd.callback = first->txd.callback; - new->txd.callback_param - = first->txd.callback_param; - first->txd.callback = NULL; - first->txd.callback_param = NULL; - } - } - - new->tx_cnt = desc_count; - new->txd.flags = orig_flags; /* client is in control of this ack */ - - /* store the original values for use in later cleanup */ - if (new != first) { - new->src = first->src; - new->dst = first->dst; - new->len = first->len; - } - - /* cookie incr and addition to used_list must be atomic */ - cookie = ioat->base.common.cookie; - cookie++; - if (cookie < 0) - cookie = 1; - ioat->base.common.cookie = new->txd.cookie = cookie; - - ioat->dmacount += desc_count; - ioat->pending += desc_count; - if (ioat->pending >= ioat_pending_level) - __ioat2_dma_memcpy_issue_pending(ioat); - spin_unlock_bh(&ioat->desc_lock); - - return cookie; -} - /** * ioat_dma_alloc_descriptor - allocate and return a sw and hw descriptor pair * @ioat: the channel supplying the memory pool for the descriptors @@ -567,17 +424,9 @@ ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat, gfp_t flags) } memset(desc, 0, sizeof(*desc)); - dma_async_tx_descriptor_init(&desc_sw->txd, &ioat->base.common); - switch (ioatdma_device->version) { - case IOAT_VER_1_2: - desc_sw->txd.tx_submit = ioat1_tx_submit; - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - desc_sw->txd.tx_submit = ioat2_tx_submit; - break; - } + dma_async_tx_descriptor_init(&desc_sw->txd, &ioat->base.common); + desc_sw->txd.tx_submit = ioat1_tx_submit; desc_sw->hw = desc; desc_sw->txd.phys = phys; @@ -587,39 +436,12 @@ ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat, gfp_t flags) static int ioat_initial_desc_count = 256; module_param(ioat_initial_desc_count, int, 0644); MODULE_PARM_DESC(ioat_initial_desc_count, - "initial descriptors per channel (default: 256)"); - -/** - * ioat2_dma_massage_chan_desc - link the descriptors into a circle - * @ioat: the channel to be massaged - */ -static void ioat2_dma_massage_chan_desc(struct ioat_dma_chan *ioat) -{ - struct ioat_desc_sw *desc, *_desc; - - /* setup used_desc */ - ioat->used_desc.next = ioat->free_desc.next; - ioat->used_desc.prev = NULL; - - /* pull free_desc out of the circle so that every node is a hw - * descriptor, but leave it pointing to the list - */ - ioat->free_desc.prev->next = ioat->free_desc.next; - ioat->free_desc.next->prev = ioat->free_desc.prev; - - /* circle link the hw descriptors */ - desc = to_ioat_desc(ioat->free_desc.next); - desc->hw->next = to_ioat_desc(desc->node.next)->txd.phys; - list_for_each_entry_safe(desc, _desc, ioat->free_desc.next, node) { - desc->hw->next = to_ioat_desc(desc->node.next)->txd.phys; - } -} - + "ioat1: initial descriptors per channel (default: 256)"); /** - * ioat_dma_alloc_chan_resources - returns the number of allocated descriptors + * ioat1_dma_alloc_chan_resources - returns the number of allocated descriptors * @chan: the channel to be filled out */ -static int ioat_dma_alloc_chan_resources(struct dma_chan *c) +static int ioat1_dma_alloc_chan_resources(struct dma_chan *c) { struct ioat_dma_chan *ioat = to_ioat_chan(c); struct ioat_chan_common *chan = &ioat->base; @@ -657,8 +479,6 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan *c) spin_lock_bh(&ioat->desc_lock); ioat->desccount = i; list_splice(&tmp_list, &ioat->free_desc); - if (chan->device->version != IOAT_VER_1_2) - ioat2_dma_massage_chan_desc(ioat); spin_unlock_bh(&ioat->desc_lock); /* allocate a completion writeback area */ @@ -674,15 +494,15 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan *c) chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); tasklet_enable(&chan->cleanup_task); - ioat_dma_start_null_desc(ioat); /* give chain to dma device */ + ioat1_dma_start_null_desc(ioat); /* give chain to dma device */ return ioat->desccount; } /** - * ioat_dma_free_chan_resources - release all the descriptors + * ioat1_dma_free_chan_resources - release all the descriptors * @chan: the channel to be cleaned */ -static void ioat_dma_free_chan_resources(struct dma_chan *c) +static void ioat1_dma_free_chan_resources(struct dma_chan *c) { struct ioat_dma_chan *ioat = to_ioat_chan(c); struct ioat_chan_common *chan = &ioat->base; @@ -697,7 +517,7 @@ static void ioat_dma_free_chan_resources(struct dma_chan *c) return; tasklet_disable(&chan->cleanup_task); - ioat_dma_memcpy_cleanup(ioat); + ioat1_cleanup(ioat); /* Delay 100ms after reset to allow internal DMA logic to quiesce * before removing DMA descriptor resources. @@ -707,40 +527,20 @@ static void ioat_dma_free_chan_resources(struct dma_chan *c) mdelay(100); spin_lock_bh(&ioat->desc_lock); - switch (chan->device->version) { - case IOAT_VER_1_2: - list_for_each_entry_safe(desc, _desc, - &ioat->used_desc, node) { - in_use_descs++; - list_del(&desc->node); - pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->txd.phys); - kfree(desc); - } - list_for_each_entry_safe(desc, _desc, - &ioat->free_desc, node) { - list_del(&desc->node); - pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->txd.phys); - kfree(desc); - } - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - list_for_each_entry_safe(desc, _desc, - ioat->free_desc.next, node) { - list_del(&desc->node); - pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->txd.phys); - kfree(desc); - } - desc = to_ioat_desc(ioat->free_desc.next); + list_for_each_entry_safe(desc, _desc, + &ioat->used_desc, node) { + in_use_descs++; + list_del(&desc->node); + pci_pool_free(ioatdma_device->dma_pool, desc->hw, + desc->txd.phys); + kfree(desc); + } + list_for_each_entry_safe(desc, _desc, + &ioat->free_desc, node) { + list_del(&desc->node); pci_pool_free(ioatdma_device->dma_pool, desc->hw, desc->txd.phys); kfree(desc); - INIT_LIST_HEAD(&ioat->free_desc); - INIT_LIST_HEAD(&ioat->used_desc); - break; } spin_unlock_bh(&ioat->desc_lock); @@ -758,7 +558,6 @@ static void ioat_dma_free_chan_resources(struct dma_chan *c) chan->last_compl_desc_addr_hw = 0; chan->watchdog_tcp_cookie = chan->watchdog_last_tcp_cookie = 0; ioat->pending = 0; - ioat->dmacount = 0; ioat->desccount = 0; } @@ -791,86 +590,6 @@ ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat) return new; } -static struct ioat_desc_sw * -ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat) -{ - struct ioat_desc_sw *new; - - /* - * used.prev points to where to start processing - * used.next points to next free descriptor - * if used.prev == NULL, there are none waiting to be processed - * if used.next == used.prev.prev, there is only one free descriptor, - * and we need to use it to as a noop descriptor before - * linking in a new set of descriptors, since the device - * has probably already read the pointer to it - */ - if (ioat->used_desc.prev && - ioat->used_desc.next == ioat->used_desc.prev->prev) { - - struct ioat_desc_sw *desc; - struct ioat_desc_sw *noop_desc; - int i; - - /* set up the noop descriptor */ - noop_desc = to_ioat_desc(ioat->used_desc.next); - /* set size to non-zero value (channel returns error when size is 0) */ - noop_desc->hw->size = NULL_DESC_BUFFER_SIZE; - noop_desc->hw->ctl = 0; - noop_desc->hw->ctl_f.null = 1; - noop_desc->hw->src_addr = 0; - noop_desc->hw->dst_addr = 0; - - ioat->used_desc.next = ioat->used_desc.next->next; - ioat->pending++; - ioat->dmacount++; - - /* try to get a few more descriptors */ - for (i = 16; i; i--) { - desc = ioat_dma_alloc_descriptor(ioat, GFP_ATOMIC); - if (!desc) { - dev_err(to_dev(&ioat->base), - "alloc failed\n"); - break; - } - list_add_tail(&desc->node, ioat->used_desc.next); - - desc->hw->next - = to_ioat_desc(desc->node.next)->txd.phys; - to_ioat_desc(desc->node.prev)->hw->next - = desc->txd.phys; - ioat->desccount++; - } - - ioat->used_desc.next = noop_desc->node.next; - } - new = to_ioat_desc(ioat->used_desc.next); - prefetch(new); - ioat->used_desc.next = new->node.next; - - if (ioat->used_desc.prev == NULL) - ioat->used_desc.prev = &new->node; - - prefetch(new->hw); - return new; -} - -static struct ioat_desc_sw * -ioat_dma_get_next_descriptor(struct ioat_dma_chan *ioat) -{ - if (!ioat) - return NULL; - - switch (ioat->base.device->version) { - case IOAT_VER_1_2: - return ioat1_dma_get_next_descriptor(ioat); - case IOAT_VER_2_0: - case IOAT_VER_3_0: - return ioat2_dma_get_next_descriptor(ioat); - } - return NULL; -} - static struct dma_async_tx_descriptor * ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, dma_addr_t dma_src, size_t len, unsigned long flags) @@ -886,7 +605,7 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, int tx_cnt = 0; spin_lock_bh(&ioat->desc_lock); - desc = ioat_dma_get_next_descriptor(ioat); + desc = ioat1_dma_get_next_descriptor(ioat); do { if (!desc) break; @@ -909,7 +628,7 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, struct ioat_desc_sw *next; async_tx_ack(&desc->txd); - next = ioat_dma_get_next_descriptor(ioat); + next = ioat1_dma_get_next_descriptor(ioat); hw->next = next ? next->txd.phys : 0; desc = next; } else @@ -920,8 +639,7 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, struct ioat_chan_common *chan = &ioat->base; dev_err(to_dev(chan), - "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", - chan_num(chan), ioat->dmacount, ioat->desccount); + "chan%d - get_next_desc failed\n", chan_num(chan)); list_splice(&chain, &ioat->free_desc); spin_unlock_bh(&ioat->desc_lock); return NULL; @@ -940,94 +658,43 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, return &desc->txd; } -static struct dma_async_tx_descriptor * -ioat2_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, - dma_addr_t dma_src, size_t len, unsigned long flags) -{ - struct ioat_dma_chan *ioat = to_ioat_chan(c); - struct ioat_desc_sw *new; - - spin_lock_bh(&ioat->desc_lock); - new = ioat2_dma_get_next_descriptor(ioat); - - /* - * leave ioat->desc_lock set in ioat 2 path - * it will get unlocked at end of tx_submit - */ - - if (new) { - new->len = len; - new->dst = dma_dest; - new->src = dma_src; - new->txd.flags = flags; - return &new->txd; - } else { - struct ioat_chan_common *chan = &ioat->base; - - spin_unlock_bh(&ioat->desc_lock); - dev_err(to_dev(chan), - "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", - chan_num(chan), ioat->dmacount, ioat->desccount); - return NULL; - } -} - -static void ioat_dma_cleanup_tasklet(unsigned long data) +static void ioat1_cleanup_tasklet(unsigned long data) { struct ioat_dma_chan *chan = (void *)data; - ioat_dma_memcpy_cleanup(chan); + ioat1_cleanup(chan); writew(IOAT_CHANCTRL_INT_DISABLE, chan->base.reg_base + IOAT_CHANCTRL_OFFSET); } -static void -ioat_dma_unmap(struct ioat_chan_common *chan, struct ioat_desc_sw *desc) +static void ioat_unmap(struct pci_dev *pdev, dma_addr_t addr, size_t len, + int direction, enum dma_ctrl_flags flags, bool dst) { - if (!(desc->txd.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { - if (desc->txd.flags & DMA_COMPL_DEST_UNMAP_SINGLE) - pci_unmap_single(chan->device->pdev, - pci_unmap_addr(desc, dst), - pci_unmap_len(desc, len), - PCI_DMA_FROMDEVICE); - else - pci_unmap_page(chan->device->pdev, - pci_unmap_addr(desc, dst), - pci_unmap_len(desc, len), - PCI_DMA_FROMDEVICE); - } - - if (!(desc->txd.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { - if (desc->txd.flags & DMA_COMPL_SRC_UNMAP_SINGLE) - pci_unmap_single(chan->device->pdev, - pci_unmap_addr(desc, src), - pci_unmap_len(desc, len), - PCI_DMA_TODEVICE); - else - pci_unmap_page(chan->device->pdev, - pci_unmap_addr(desc, src), - pci_unmap_len(desc, len), - PCI_DMA_TODEVICE); - } + if ((dst && (flags & DMA_COMPL_DEST_UNMAP_SINGLE)) || + (!dst && (flags & DMA_COMPL_SRC_UNMAP_SINGLE))) + pci_unmap_single(pdev, addr, len, direction); + else + pci_unmap_page(pdev, addr, len, direction); } -/** - * ioat_dma_memcpy_cleanup - cleanup up finished descriptors - * @chan: ioat channel to be cleaned up - */ -static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat) + +void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags, + size_t len, struct ioat_dma_descriptor *hw) { - struct ioat_chan_common *chan = &ioat->base; - unsigned long phys_complete; - struct ioat_desc_sw *desc, *_desc; - dma_cookie_t cookie = 0; - unsigned long desc_phys; - struct ioat_desc_sw *latest_desc; - struct dma_async_tx_descriptor *tx; + struct pci_dev *pdev = chan->device->pdev; + size_t offset = len - hw->size; - prefetch(chan->completion_virt); + if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) + ioat_unmap(pdev, hw->dst_addr - offset, len, + PCI_DMA_FROMDEVICE, flags, 1); - if (!spin_trylock_bh(&chan->cleanup_lock)) - return; + if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) + ioat_unmap(pdev, hw->src_addr - offset, len, + PCI_DMA_TODEVICE, flags, 0); +} + +unsigned long ioat_get_current_completion(struct ioat_chan_common *chan) +{ + unsigned long phys_complete; /* The completion writeback can happen at any time, so reads by the driver need to be atomic operations @@ -1051,18 +718,37 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat) /* TODO do something to salvage the situation */ } + return phys_complete; +} + +/** + * ioat1_cleanup - cleanup up finished descriptors + * @chan: ioat channel to be cleaned up + */ +static void ioat1_cleanup(struct ioat_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + unsigned long phys_complete; + struct ioat_desc_sw *desc, *_desc; + dma_cookie_t cookie = 0; + struct dma_async_tx_descriptor *tx; + + prefetch(chan->completion_virt); + + if (!spin_trylock_bh(&chan->cleanup_lock)) + return; + + phys_complete = ioat_get_current_completion(chan); if (phys_complete == chan->last_completion) { spin_unlock_bh(&chan->cleanup_lock); /* * perhaps we're stuck so hard that the watchdog can't go off? * try to catch it after 2 seconds */ - if (chan->device->version != IOAT_VER_3_0) { - if (time_after(jiffies, - chan->last_completion_time + HZ*WATCHDOG_DELAY)) { - ioat_dma_chan_watchdog(&(chan->device->work.work)); - chan->last_completion_time = jiffies; - } + if (time_after(jiffies, + chan->last_completion_time + HZ*WATCHDOG_DELAY)) { + ioat1_chan_watchdog(&(chan->device->work.work)); + chan->last_completion_time = jiffies; } return; } @@ -1074,91 +760,42 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat) return; } - switch (chan->device->version) { - case IOAT_VER_1_2: - list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) { - tx = &desc->txd; - /* - * Incoming DMA requests may use multiple descriptors, - * due to exceeding xfercap, perhaps. If so, only the - * last one will have a cookie, and require unmapping. - */ - if (tx->cookie) { - cookie = tx->cookie; - ioat_dma_unmap(chan, desc); - if (tx->callback) { - tx->callback(tx->callback_param); - tx->callback = NULL; - } + list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) { + tx = &desc->txd; + /* + * Incoming DMA requests may use multiple descriptors, + * due to exceeding xfercap, perhaps. If so, only the + * last one will have a cookie, and require unmapping. + */ + if (tx->cookie) { + cookie = tx->cookie; + ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw); + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; } + } - if (tx->phys != phys_complete) { - /* - * a completed entry, but not the last, so clean - * up if the client is done with the descriptor - */ - if (async_tx_test_ack(tx)) { - list_move_tail(&desc->node, - &ioat->free_desc); - } else - tx->cookie = 0; - } else { - /* - * last used desc. Do not remove, so we can - * append from it, but don't look at it next - * time, either - */ + if (tx->phys != phys_complete) { + /* + * a completed entry, but not the last, so clean + * up if the client is done with the descriptor + */ + if (async_tx_test_ack(tx)) + list_move_tail(&desc->node, &ioat->free_desc); + else tx->cookie = 0; + } else { + /* + * last used desc. Do not remove, so we can + * append from it, but don't look at it next + * time, either + */ + tx->cookie = 0; - /* TODO check status bits? */ - break; - } - } - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - /* has some other thread has already cleaned up? */ - if (ioat->used_desc.prev == NULL) + /* TODO check status bits? */ break; - - /* work backwards to find latest finished desc */ - desc = to_ioat_desc(ioat->used_desc.next); - tx = &desc->txd; - latest_desc = NULL; - do { - desc = to_ioat_desc(desc->node.prev); - desc_phys = (unsigned long)tx->phys - & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; - if (desc_phys == phys_complete) { - latest_desc = desc; - break; - } - } while (&desc->node != ioat->used_desc.prev); - - if (latest_desc != NULL) { - /* work forwards to clear finished descriptors */ - for (desc = to_ioat_desc(ioat->used_desc.prev); - &desc->node != latest_desc->node.next && - &desc->node != ioat->used_desc.next; - desc = to_ioat_desc(desc->node.next)) { - if (tx->cookie) { - cookie = tx->cookie; - tx->cookie = 0; - ioat_dma_unmap(chan, desc); - if (tx->callback) { - tx->callback(tx->callback_param); - tx->callback = NULL; - } - } - } - - /* move used.prev up beyond those that are finished */ - if (&desc->node == ioat->used_desc.next) - ioat->used_desc.prev = NULL; - else - ioat->used_desc.prev = &desc->node; } - break; } spin_unlock_bh(&ioat->desc_lock); @@ -1170,50 +807,21 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat) spin_unlock_bh(&chan->cleanup_lock); } -/** - * ioat_dma_is_complete - poll the status of a IOAT DMA transaction - * @chan: IOAT DMA channel handle - * @cookie: DMA transaction identifier - * @done: if not %NULL, updated with last completed transaction - * @used: if not %NULL, updated with last used transaction - */ static enum dma_status -ioat_dma_is_complete(struct dma_chan *c, dma_cookie_t cookie, - dma_cookie_t *done, dma_cookie_t *used) +ioat1_dma_is_complete(struct dma_chan *c, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used) { struct ioat_dma_chan *ioat = to_ioat_chan(c); - struct ioat_chan_common *chan = &ioat->base; - dma_cookie_t last_used; - dma_cookie_t last_complete; - enum dma_status ret; - - last_used = c->cookie; - last_complete = chan->completed_cookie; - chan->watchdog_tcp_cookie = cookie; - - if (done) - *done = last_complete; - if (used) - *used = last_used; - - ret = dma_async_is_complete(cookie, last_complete, last_used); - if (ret == DMA_SUCCESS) - return ret; - ioat_dma_memcpy_cleanup(ioat); + if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS) + return DMA_SUCCESS; - last_used = c->cookie; - last_complete = chan->completed_cookie; + ioat1_cleanup(ioat); - if (done) - *done = last_complete; - if (used) - *used = last_used; - - return dma_async_is_complete(cookie, last_complete, last_used); + return ioat_is_complete(c, cookie, done, used); } -static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat) +static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat) { struct ioat_chan_common *chan = &ioat->base; struct ioat_desc_sw *desc; @@ -1221,7 +829,7 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat) spin_lock_bh(&ioat->desc_lock); - desc = ioat_dma_get_next_descriptor(ioat); + desc = ioat1_dma_get_next_descriptor(ioat); if (!desc) { dev_err(to_dev(chan), @@ -1240,30 +848,16 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat) hw->src_addr = 0; hw->dst_addr = 0; async_tx_ack(&desc->txd); - switch (chan->device->version) { - case IOAT_VER_1_2: - hw->next = 0; - list_add_tail(&desc->node, &ioat->used_desc); + hw->next = 0; + list_add_tail(&desc->node, &ioat->used_desc); - writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->txd.phys) >> 32, - chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); - - writeb(IOAT_CHANCMD_START, chan->reg_base - + IOAT_CHANCMD_OFFSET(chan->device->version)); - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->txd.phys) >> 32, - chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); + writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, + chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); + writel(((u64) desc->txd.phys) >> 32, + chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); - ioat->dmacount++; - __ioat2_dma_memcpy_issue_pending(ioat); - break; - } + writeb(IOAT_CHANCMD_START, chan->reg_base + + IOAT_CHANCMD_OFFSET(chan->device->version)); spin_unlock_bh(&ioat->desc_lock); } @@ -1484,7 +1078,7 @@ static void ioat_disable_interrupts(struct ioatdma_device *device) writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); } -static int ioat_probe(struct ioatdma_device *device) +int ioat_probe(struct ioatdma_device *device) { int err = -ENODEV; struct dma_device *dma = &device->common; @@ -1503,17 +1097,15 @@ static int ioat_probe(struct ioatdma_device *device) device->completion_pool = pci_pool_create("completion_pool", pdev, sizeof(u64), SMP_CACHE_BYTES, SMP_CACHE_BYTES); + if (!device->completion_pool) { err = -ENOMEM; goto err_completion_pool; } - ioat_dma_enumerate_channels(device); + device->enumerate_channels(device); dma_cap_set(DMA_MEMCPY, dma->cap_mask); - dma->device_alloc_chan_resources = ioat_dma_alloc_chan_resources; - dma->device_free_chan_resources = ioat_dma_free_chan_resources; - dma->device_is_tx_complete = ioat_dma_is_complete; dma->dev = &pdev->dev; dev_err(dev, "Intel(R) I/OAT DMA Engine found," @@ -1546,7 +1138,7 @@ err_dma_pool: return err; } -static int ioat_register(struct ioatdma_device *device) +int ioat_register(struct ioatdma_device *device) { int err = dma_async_device_register(&device->common); @@ -1580,9 +1172,13 @@ int ioat1_dma_probe(struct ioatdma_device *device, int dca) int err; device->intr_quirk = ioat1_intr_quirk; + device->enumerate_channels = ioat1_enumerate_channels; dma = &device->common; dma->device_prep_dma_memcpy = ioat1_dma_prep_memcpy; dma->device_issue_pending = ioat1_dma_memcpy_issue_pending; + dma->device_alloc_chan_resources = ioat1_dma_alloc_chan_resources; + dma->device_free_chan_resources = ioat1_dma_free_chan_resources; + dma->device_is_tx_complete = ioat1_dma_is_complete; err = ioat_probe(device); if (err) @@ -1594,93 +1190,12 @@ int ioat1_dma_probe(struct ioatdma_device *device, int dca) if (dca) device->dca = ioat_dca_init(pdev, device->reg_base); - INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog); - schedule_delayed_work(&device->work, WATCHDOG_DELAY); - - return err; -} - -int ioat2_dma_probe(struct ioatdma_device *device, int dca) -{ - struct pci_dev *pdev = device->pdev; - struct dma_device *dma; - struct dma_chan *c; - struct ioat_chan_common *chan; - int err; - - dma = &device->common; - dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy; - dma->device_issue_pending = ioat2_dma_memcpy_issue_pending; - - err = ioat_probe(device); - if (err) - return err; - ioat_set_tcp_copy_break(2048); - - list_for_each_entry(c, &dma->channels, device_node) { - chan = to_chan_common(c); - writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE | IOAT_DMA_DCA_ANY_CPU, - chan->reg_base + IOAT_DCACTRL_OFFSET); - } - - err = ioat_register(device); - if (err) - return err; - if (dca) - device->dca = ioat2_dca_init(pdev, device->reg_base); - - INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog); + INIT_DELAYED_WORK(&device->work, ioat1_chan_watchdog); schedule_delayed_work(&device->work, WATCHDOG_DELAY); return err; } -int ioat3_dma_probe(struct ioatdma_device *device, int dca) -{ - struct pci_dev *pdev = device->pdev; - struct dma_device *dma; - struct dma_chan *c; - struct ioat_chan_common *chan; - int err; - u16 dev_id; - - dma = &device->common; - dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy; - dma->device_issue_pending = ioat2_dma_memcpy_issue_pending; - - /* -= IOAT ver.3 workarounds =- */ - /* Write CHANERRMSK_INT with 3E07h to mask out the errors - * that can cause stability issues for IOAT ver.3 - */ - pci_write_config_dword(pdev, IOAT_PCI_CHANERRMASK_INT_OFFSET, 0x3e07); - - /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit - * (workaround for spurious config parity error after restart) - */ - pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id); - if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) - pci_write_config_dword(pdev, IOAT_PCI_DMAUNCERRSTS_OFFSET, 0x10); - - err = ioat_probe(device); - if (err) - return err; - ioat_set_tcp_copy_break(262144); - - list_for_each_entry(c, &dma->channels, device_node) { - chan = to_chan_common(c); - writel(IOAT_DMA_DCA_ANY_CPU, - chan->reg_base + IOAT_DCACTRL_OFFSET); - } - - err = ioat_register(device); - if (err) - return err; - if (dca) - device->dca = ioat3_dca_init(pdev, device->reg_base); - - return err; -} - void ioat_dma_remove(struct ioatdma_device *device) { struct dma_device *dma = &device->common; @@ -1697,4 +1212,3 @@ void ioat_dma_remove(struct ioatdma_device *device) INIT_LIST_HEAD(&dma->channels); } - diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index 5b31db73ad8e..84065dfa4d40 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -62,6 +62,7 @@ * @idx: per channel data * @dca: direct cache access context * @intr_quirk: interrupt setup quirk (for ioat_v1 devices) + * @enumerate_channels: hw version specific channel enumeration */ struct ioatdma_device { @@ -76,6 +77,7 @@ struct ioatdma_device { struct ioat_chan_common *idx[4]; struct dca_provider *dca; void (*intr_quirk)(struct ioatdma_device *device); + int (*enumerate_channels)(struct ioatdma_device *device); }; struct ioat_chan_common { @@ -106,6 +108,7 @@ struct ioat_chan_common { struct tasklet_struct cleanup_task; }; + /** * struct ioat_dma_chan - internal representation of a DMA channel */ @@ -119,7 +122,6 @@ struct ioat_dma_chan { struct list_head used_desc; int pending; - u16 dmacount; u16 desccount; }; @@ -135,6 +137,33 @@ static inline struct ioat_dma_chan *to_ioat_chan(struct dma_chan *c) return container_of(chan, struct ioat_dma_chan, base); } +/** + * ioat_is_complete - poll the status of an ioat transaction + * @c: channel handle + * @cookie: transaction identifier + * @done: if set, updated with last completed transaction + * @used: if set, updated with last used transaction + */ +static inline enum dma_status +ioat_is_complete(struct dma_chan *c, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used) +{ + struct ioat_chan_common *chan = to_chan_common(c); + dma_cookie_t last_used; + dma_cookie_t last_complete; + + last_used = c->cookie; + last_complete = chan->completed_cookie; + chan->watchdog_tcp_cookie = cookie; + + if (done) + *done = last_complete; + if (used) + *used = last_used; + + return dma_async_is_complete(cookie, last_complete, last_used); +} + /* wrapper around hardware descriptor format + additional software fields */ /** @@ -162,11 +191,22 @@ static inline void ioat_set_tcp_copy_break(unsigned long copybreak) #endif } +static inline struct ioat_chan_common * +ioat_chan_by_index(struct ioatdma_device *device, int index) +{ + return device->idx[index]; +} + +int ioat_probe(struct ioatdma_device *device); +int ioat_register(struct ioatdma_device *device); int ioat1_dma_probe(struct ioatdma_device *dev, int dca); -int ioat2_dma_probe(struct ioatdma_device *dev, int dca); -int ioat3_dma_probe(struct ioatdma_device *dev, int dca); void ioat_dma_remove(struct ioatdma_device *device); struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase); -struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); -struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); +unsigned long ioat_get_current_completion(struct ioat_chan_common *chan); +void ioat_init_channel(struct ioatdma_device *device, + struct ioat_chan_common *chan, int idx, + work_func_t work_fn, void (*tasklet)(unsigned long), + unsigned long tasklet_data); +void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags, + size_t len, struct ioat_dma_descriptor *hw); #endif /* IOATDMA_H */ diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c new file mode 100644 index 000000000000..49ba1c73d95e --- /dev/null +++ b/drivers/dma/ioat/dma_v2.c @@ -0,0 +1,750 @@ +/* + * Intel I/OAT DMA Linux driver + * Copyright(c) 2004 - 2009 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + */ + +/* + * This driver supports an Intel I/OAT DMA engine (versions >= 2), which + * does asynchronous data movement and checksumming operations. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/workqueue.h> +#include <linux/i7300_idle.h> +#include "dma.h" +#include "dma_v2.h" +#include "registers.h" +#include "hw.h" + +static int ioat_ring_alloc_order = 8; +module_param(ioat_ring_alloc_order, int, 0644); +MODULE_PARM_DESC(ioat_ring_alloc_order, + "ioat2+: allocate 2^n descriptors per channel (default: n=8)"); + +static void __ioat2_issue_pending(struct ioat2_dma_chan *ioat) +{ + void * __iomem reg_base = ioat->base.reg_base; + + ioat->pending = 0; + ioat->dmacount += ioat2_ring_pending(ioat); + ioat->issued = ioat->head; + /* make descriptor updates globally visible before notifying channel */ + wmb(); + writew(ioat->dmacount, reg_base + IOAT_CHAN_DMACOUNT_OFFSET); + +} + +static void ioat2_issue_pending(struct dma_chan *chan) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(chan); + + spin_lock_bh(&ioat->ring_lock); + if (ioat->pending == 1) + __ioat2_issue_pending(ioat); + spin_unlock_bh(&ioat->ring_lock); +} + +/** + * ioat2_update_pending - log pending descriptors + * @ioat: ioat2+ channel + * + * set pending to '1' unless pending is already set to '2', pending == 2 + * indicates that submission is temporarily blocked due to an in-flight + * reset. If we are already above the ioat_pending_level threshold then + * just issue pending. + * + * called with ring_lock held + */ +static void ioat2_update_pending(struct ioat2_dma_chan *ioat) +{ + if (unlikely(ioat->pending == 2)) + return; + else if (ioat2_ring_pending(ioat) > ioat_pending_level) + __ioat2_issue_pending(ioat); + else + ioat->pending = 1; +} + +static void __ioat2_start_null_desc(struct ioat2_dma_chan *ioat) +{ + void __iomem *reg_base = ioat->base.reg_base; + struct ioat_ring_ent *desc; + struct ioat_dma_descriptor *hw; + int idx; + + if (ioat2_ring_space(ioat) < 1) { + dev_err(to_dev(&ioat->base), + "Unable to start null desc - ring full\n"); + return; + } + + idx = ioat2_desc_alloc(ioat, 1); + desc = ioat2_get_ring_ent(ioat, idx); + + hw = desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = 1; + hw->ctl_f.compl_write = 1; + /* set size to non-zero value (channel returns error when size is 0) */ + hw->size = NULL_DESC_BUFFER_SIZE; + hw->src_addr = 0; + hw->dst_addr = 0; + async_tx_ack(&desc->txd); + writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, + reg_base + IOAT2_CHAINADDR_OFFSET_LOW); + writel(((u64) desc->txd.phys) >> 32, + reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); + __ioat2_issue_pending(ioat); +} + +static void ioat2_start_null_desc(struct ioat2_dma_chan *ioat) +{ + spin_lock_bh(&ioat->ring_lock); + __ioat2_start_null_desc(ioat); + spin_unlock_bh(&ioat->ring_lock); +} + +static void ioat2_cleanup(struct ioat2_dma_chan *ioat); + +/** + * ioat2_reset_part2 - reinit the channel after a reset + */ +static void ioat2_reset_part2(struct work_struct *work) +{ + struct ioat_chan_common *chan; + struct ioat2_dma_chan *ioat; + + chan = container_of(work, struct ioat_chan_common, work.work); + ioat = container_of(chan, struct ioat2_dma_chan, base); + + /* ensure that ->tail points to the stalled descriptor + * (ioat->pending is set to 2 at this point so no new + * descriptors will be issued while we perform this cleanup) + */ + ioat2_cleanup(ioat); + + spin_lock_bh(&chan->cleanup_lock); + spin_lock_bh(&ioat->ring_lock); + + /* set the tail to be re-issued */ + ioat->issued = ioat->tail; + ioat->dmacount = 0; + + if (ioat2_ring_pending(ioat)) { + struct ioat_ring_ent *desc; + + desc = ioat2_get_ring_ent(ioat, ioat->tail); + writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, + chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); + writel(((u64) desc->txd.phys) >> 32, + chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); + __ioat2_issue_pending(ioat); + } else + __ioat2_start_null_desc(ioat); + + spin_unlock_bh(&ioat->ring_lock); + spin_unlock_bh(&chan->cleanup_lock); + + dev_info(to_dev(chan), + "chan%d reset - %d descs waiting, %d total desc\n", + chan_num(chan), ioat->dmacount, 1 << ioat->alloc_order); +} + +/** + * ioat2_reset_channel - restart a channel + * @ioat: IOAT DMA channel handle + */ +static void ioat2_reset_channel(struct ioat2_dma_chan *ioat) +{ + u32 chansts, chanerr; + struct ioat_chan_common *chan = &ioat->base; + u16 active; + + spin_lock_bh(&ioat->ring_lock); + active = ioat2_ring_active(ioat); + spin_unlock_bh(&ioat->ring_lock); + if (!active) + return; + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + chansts = (chan->completion_virt->low + & IOAT_CHANSTS_DMA_TRANSFER_STATUS); + if (chanerr) { + dev_err(to_dev(chan), + "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", + chan_num(chan), chansts, chanerr); + writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); + } + + spin_lock_bh(&ioat->ring_lock); + ioat->pending = 2; + writeb(IOAT_CHANCMD_RESET, + chan->reg_base + + IOAT_CHANCMD_OFFSET(chan->device->version)); + spin_unlock_bh(&ioat->ring_lock); + schedule_delayed_work(&chan->work, RESET_DELAY); +} + +/** + * ioat2_chan_watchdog - watch for stuck channels + */ +static void ioat2_chan_watchdog(struct work_struct *work) +{ + struct ioatdma_device *device = + container_of(work, struct ioatdma_device, work.work); + struct ioat2_dma_chan *ioat; + struct ioat_chan_common *chan; + u16 active; + int i; + + for (i = 0; i < device->common.chancnt; i++) { + chan = ioat_chan_by_index(device, i); + ioat = container_of(chan, struct ioat2_dma_chan, base); + + /* + * for version 2.0 if there are descriptors yet to be processed + * and the last completed hasn't changed since the last watchdog + * if they haven't hit the pending level + * issue the pending to push them through + * else + * try resetting the channel + */ + spin_lock_bh(&ioat->ring_lock); + active = ioat2_ring_active(ioat); + spin_unlock_bh(&ioat->ring_lock); + + if (active && + chan->last_completion && + chan->last_completion == chan->watchdog_completion) { + + if (ioat->pending == 1) + ioat2_issue_pending(&chan->common); + else { + ioat2_reset_channel(ioat); + chan->watchdog_completion = 0; + } + } else { + chan->last_compl_desc_addr_hw = 0; + chan->watchdog_completion = chan->last_completion; + } + chan->watchdog_last_tcp_cookie = chan->watchdog_tcp_cookie; + } + schedule_delayed_work(&device->work, WATCHDOG_DELAY); +} + +/** + * ioat2_cleanup - clean finished descriptors (advance tail pointer) + * @chan: ioat channel to be cleaned up + */ +static void ioat2_cleanup(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + unsigned long phys_complete; + struct ioat_ring_ent *desc; + bool seen_current = false; + u16 active; + int i; + struct dma_async_tx_descriptor *tx; + + prefetch(chan->completion_virt); + + spin_lock_bh(&chan->cleanup_lock); + phys_complete = ioat_get_current_completion(chan); + if (phys_complete == chan->last_completion) { + spin_unlock_bh(&chan->cleanup_lock); + /* + * perhaps we're stuck so hard that the watchdog can't go off? + * try to catch it after WATCHDOG_DELAY seconds + */ + if (chan->device->version < IOAT_VER_3_0) { + unsigned long tmo; + + tmo = chan->last_completion_time + HZ*WATCHDOG_DELAY; + if (time_after(jiffies, tmo)) { + ioat2_chan_watchdog(&(chan->device->work.work)); + chan->last_completion_time = jiffies; + } + } + return; + } + chan->last_completion_time = jiffies; + + spin_lock_bh(&ioat->ring_lock); + + active = ioat2_ring_active(ioat); + for (i = 0; i < active && !seen_current; i++) { + prefetch(ioat2_get_ring_ent(ioat, ioat->tail + i + 1)); + desc = ioat2_get_ring_ent(ioat, ioat->tail + i); + tx = &desc->txd; + if (tx->cookie) { + ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw); + chan->completed_cookie = tx->cookie; + tx->cookie = 0; + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; + } + } + + if (tx->phys == phys_complete) + seen_current = true; + } + ioat->tail += i; + BUG_ON(!seen_current); /* no active descs have written a completion? */ + spin_unlock_bh(&ioat->ring_lock); + + chan->last_completion = phys_complete; + + spin_unlock_bh(&chan->cleanup_lock); +} + +static void ioat2_cleanup_tasklet(unsigned long data) +{ + struct ioat2_dma_chan *ioat = (void *) data; + + ioat2_cleanup(ioat); + writew(IOAT_CHANCTRL_INT_DISABLE, + ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); +} + +/** + * ioat2_enumerate_channels - find and initialize the device's channels + * @device: the device to be enumerated + */ +static int ioat2_enumerate_channels(struct ioatdma_device *device) +{ + struct ioat2_dma_chan *ioat; + struct device *dev = &device->pdev->dev; + struct dma_device *dma = &device->common; + u8 xfercap_log; + int i; + + INIT_LIST_HEAD(&dma->channels); + dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); + xfercap_log = readb(device->reg_base + IOAT_XFERCAP_OFFSET); + if (xfercap_log == 0) + return 0; + + /* FIXME which i/oat version is i7300? */ +#ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL + if (i7300_idle_platform_probe(NULL, NULL, 1) == 0) + dma->chancnt--; +#endif + for (i = 0; i < dma->chancnt; i++) { + ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL); + if (!ioat) + break; + + ioat_init_channel(device, &ioat->base, i, + ioat2_reset_part2, + ioat2_cleanup_tasklet, + (unsigned long) ioat); + ioat->xfercap_log = xfercap_log; + spin_lock_init(&ioat->ring_lock); + } + dma->chancnt = i; + return i; +} + +static dma_cookie_t ioat2_tx_submit_unlock(struct dma_async_tx_descriptor *tx) +{ + struct dma_chan *c = tx->chan; + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + dma_cookie_t cookie = c->cookie; + + cookie++; + if (cookie < 0) + cookie = 1; + tx->cookie = cookie; + c->cookie = cookie; + ioat2_update_pending(ioat); + spin_unlock_bh(&ioat->ring_lock); + + return cookie; +} + +static struct ioat_ring_ent *ioat2_alloc_ring_ent(struct dma_chan *chan) +{ + struct ioat_dma_descriptor *hw; + struct ioat_ring_ent *desc; + struct ioatdma_device *dma; + dma_addr_t phys; + + dma = to_ioatdma_device(chan->device); + hw = pci_pool_alloc(dma->dma_pool, GFP_KERNEL, &phys); + if (!hw) + return NULL; + memset(hw, 0, sizeof(*hw)); + + desc = kzalloc(sizeof(*desc), GFP_KERNEL); + if (!desc) { + pci_pool_free(dma->dma_pool, hw, phys); + return NULL; + } + + dma_async_tx_descriptor_init(&desc->txd, chan); + desc->txd.tx_submit = ioat2_tx_submit_unlock; + desc->hw = hw; + desc->txd.phys = phys; + return desc; +} + +static void ioat2_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan) +{ + struct ioatdma_device *dma; + + dma = to_ioatdma_device(chan->device); + pci_pool_free(dma->dma_pool, desc->hw, desc->txd.phys); + kfree(desc); +} + +/* ioat2_alloc_chan_resources - allocate/initialize ioat2 descriptor ring + * @chan: channel to be initialized + */ +static int ioat2_alloc_chan_resources(struct dma_chan *c) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioat_ring_ent **ring; + u16 chanctrl; + u32 chanerr; + int descs; + int i; + + /* have we already been set up? */ + if (ioat->ring) + return 1 << ioat->alloc_order; + + /* Setup register to interrupt and write completion status on error */ + chanctrl = IOAT_CHANCTRL_ERR_INT_EN | IOAT_CHANCTRL_ANY_ERR_ABORT_EN | + IOAT_CHANCTRL_ERR_COMPLETION_EN; + writew(chanctrl, chan->reg_base + IOAT_CHANCTRL_OFFSET); + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + if (chanerr) { + dev_err(to_dev(chan), "CHANERR = %x, clearing\n", chanerr); + writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); + } + + /* allocate a completion writeback area */ + /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ + chan->completion_virt = pci_pool_alloc(chan->device->completion_pool, + GFP_KERNEL, + &chan->completion_addr); + if (!chan->completion_virt) + return -ENOMEM; + + memset(chan->completion_virt, 0, + sizeof(*chan->completion_virt)); + writel(((u64) chan->completion_addr) & 0x00000000FFFFFFFF, + chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); + writel(((u64) chan->completion_addr) >> 32, + chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); + + ioat->alloc_order = ioat_get_alloc_order(); + descs = 1 << ioat->alloc_order; + + /* allocate the array to hold the software ring */ + ring = kcalloc(descs, sizeof(*ring), GFP_KERNEL); + if (!ring) + return -ENOMEM; + for (i = 0; i < descs; i++) { + ring[i] = ioat2_alloc_ring_ent(c); + if (!ring[i]) { + while (i--) + ioat2_free_ring_ent(ring[i], c); + kfree(ring); + return -ENOMEM; + } + } + + /* link descs */ + for (i = 0; i < descs-1; i++) { + struct ioat_ring_ent *next = ring[i+1]; + struct ioat_dma_descriptor *hw = ring[i]->hw; + + hw->next = next->txd.phys; + } + ring[i]->hw->next = ring[0]->txd.phys; + + spin_lock_bh(&ioat->ring_lock); + ioat->ring = ring; + ioat->head = 0; + ioat->issued = 0; + ioat->tail = 0; + ioat->pending = 0; + spin_unlock_bh(&ioat->ring_lock); + + tasklet_enable(&chan->cleanup_task); + ioat2_start_null_desc(ioat); + + return descs; +} + +/** + * ioat2_alloc_and_lock - common descriptor alloc boilerplate for ioat2,3 ops + * @idx: gets starting descriptor index on successful allocation + * @ioat: ioat2,3 channel (ring) to operate on + * @num_descs: allocation length + */ +static int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_descs) +{ + struct ioat_chan_common *chan = &ioat->base; + + spin_lock_bh(&ioat->ring_lock); + if (unlikely(ioat2_ring_space(ioat) < num_descs)) { + if (printk_ratelimit()) + dev_dbg(to_dev(chan), + "%s: ring full! num_descs: %d (%x:%x:%x)\n", + __func__, num_descs, ioat->head, ioat->tail, + ioat->issued); + spin_unlock_bh(&ioat->ring_lock); + + /* do direct reclaim in the allocation failure case */ + ioat2_cleanup(ioat); + + return -ENOMEM; + } + + dev_dbg(to_dev(chan), "%s: num_descs: %d (%x:%x:%x)\n", + __func__, num_descs, ioat->head, ioat->tail, ioat->issued); + + *idx = ioat2_desc_alloc(ioat, num_descs); + return 0; /* with ioat->ring_lock held */ +} + +static struct dma_async_tx_descriptor * +ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_dma_descriptor *hw; + struct ioat_ring_ent *desc; + dma_addr_t dst = dma_dest; + dma_addr_t src = dma_src; + size_t total_len = len; + int num_descs; + u16 idx; + int i; + + num_descs = ioat2_xferlen_to_descs(ioat, len); + if (likely(num_descs) && + ioat2_alloc_and_lock(&idx, ioat, num_descs) == 0) + /* pass */; + else + return NULL; + for (i = 0; i < num_descs; i++) { + size_t copy = min_t(size_t, len, 1 << ioat->xfercap_log); + + desc = ioat2_get_ring_ent(ioat, idx + i); + hw = desc->hw; + + hw->size = copy; + hw->ctl = 0; + hw->src_addr = src; + hw->dst_addr = dst; + + len -= copy; + dst += copy; + src += copy; + } + + desc->txd.flags = flags; + desc->len = total_len; + hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + hw->ctl_f.compl_write = 1; + /* we leave the channel locked to ensure in order submission */ + + return &desc->txd; +} + +/** + * ioat2_free_chan_resources - release all the descriptors + * @chan: the channel to be cleaned + */ +static void ioat2_free_chan_resources(struct dma_chan *c) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioatdma_device *ioatdma_device = chan->device; + struct ioat_ring_ent *desc; + const u16 total_descs = 1 << ioat->alloc_order; + int descs; + int i; + + /* Before freeing channel resources first check + * if they have been previously allocated for this channel. + */ + if (!ioat->ring) + return; + + tasklet_disable(&chan->cleanup_task); + ioat2_cleanup(ioat); + + /* Delay 100ms after reset to allow internal DMA logic to quiesce + * before removing DMA descriptor resources. + */ + writeb(IOAT_CHANCMD_RESET, + chan->reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); + mdelay(100); + + spin_lock_bh(&ioat->ring_lock); + descs = ioat2_ring_space(ioat); + for (i = 0; i < descs; i++) { + desc = ioat2_get_ring_ent(ioat, ioat->head + i); + ioat2_free_ring_ent(desc, c); + } + + if (descs < total_descs) + dev_err(to_dev(chan), "Freeing %d in use descriptors!\n", + total_descs - descs); + + for (i = 0; i < total_descs - descs; i++) { + desc = ioat2_get_ring_ent(ioat, ioat->tail + i); + ioat2_free_ring_ent(desc, c); + } + + kfree(ioat->ring); + ioat->ring = NULL; + ioat->alloc_order = 0; + pci_pool_free(ioatdma_device->completion_pool, + chan->completion_virt, + chan->completion_addr); + spin_unlock_bh(&ioat->ring_lock); + + chan->last_completion = 0; + chan->completion_addr = 0; + ioat->pending = 0; + ioat->dmacount = 0; + chan->watchdog_completion = 0; + chan->last_compl_desc_addr_hw = 0; + chan->watchdog_tcp_cookie = 0; + chan->watchdog_last_tcp_cookie = 0; +} + +static enum dma_status +ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + + if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS) + return DMA_SUCCESS; + + ioat2_cleanup(ioat); + + return ioat_is_complete(c, cookie, done, used); +} + +int ioat2_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + struct dma_chan *c; + struct ioat_chan_common *chan; + int err; + + device->enumerate_channels = ioat2_enumerate_channels; + dma = &device->common; + dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; + dma->device_issue_pending = ioat2_issue_pending; + dma->device_alloc_chan_resources = ioat2_alloc_chan_resources; + dma->device_free_chan_resources = ioat2_free_chan_resources; + dma->device_is_tx_complete = ioat2_is_complete; + + err = ioat_probe(device); + if (err) + return err; + ioat_set_tcp_copy_break(2048); + + list_for_each_entry(c, &dma->channels, device_node) { + chan = to_chan_common(c); + writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE | IOAT_DMA_DCA_ANY_CPU, + chan->reg_base + IOAT_DCACTRL_OFFSET); + } + + err = ioat_register(device); + if (err) + return err; + if (dca) + device->dca = ioat2_dca_init(pdev, device->reg_base); + + INIT_DELAYED_WORK(&device->work, ioat2_chan_watchdog); + schedule_delayed_work(&device->work, WATCHDOG_DELAY); + + return err; +} + +int ioat3_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + struct dma_chan *c; + struct ioat_chan_common *chan; + int err; + u16 dev_id; + + device->enumerate_channels = ioat2_enumerate_channels; + dma = &device->common; + dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; + dma->device_issue_pending = ioat2_issue_pending; + dma->device_alloc_chan_resources = ioat2_alloc_chan_resources; + dma->device_free_chan_resources = ioat2_free_chan_resources; + dma->device_is_tx_complete = ioat2_is_complete; + + /* -= IOAT ver.3 workarounds =- */ + /* Write CHANERRMSK_INT with 3E07h to mask out the errors + * that can cause stability issues for IOAT ver.3 + */ + pci_write_config_dword(pdev, IOAT_PCI_CHANERRMASK_INT_OFFSET, 0x3e07); + + /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit + * (workaround for spurious config parity error after restart) + */ + pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id); + if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) + pci_write_config_dword(pdev, IOAT_PCI_DMAUNCERRSTS_OFFSET, 0x10); + + err = ioat_probe(device); + if (err) + return err; + ioat_set_tcp_copy_break(262144); + + list_for_each_entry(c, &dma->channels, device_node) { + chan = to_chan_common(c); + writel(IOAT_DMA_DCA_ANY_CPU, + chan->reg_base + IOAT_DCACTRL_OFFSET); + } + + err = ioat_register(device); + if (err) + return err; + if (dca) + device->dca = ioat3_dca_init(pdev, device->reg_base); + + return err; +} diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h new file mode 100644 index 000000000000..94a553eacdbd --- /dev/null +++ b/drivers/dma/ioat/dma_v2.h @@ -0,0 +1,131 @@ +/* + * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ +#ifndef IOATDMA_V2_H +#define IOATDMA_V2_H + +#include <linux/dmaengine.h> +#include "dma.h" +#include "hw.h" + + +extern int ioat_pending_level; + +/* + * workaround for IOAT ver.3.0 null descriptor issue + * (channel returns error when size is 0) + */ +#define NULL_DESC_BUFFER_SIZE 1 + +#define IOAT_MAX_ORDER 16 +#define ioat_get_alloc_order() \ + (min(ioat_ring_alloc_order, IOAT_MAX_ORDER)) + +/* struct ioat2_dma_chan - ioat v2 / v3 channel attributes + * @base: common ioat channel parameters + * @xfercap_log; log2 of channel max transfer length (for fast division) + * @head: allocated index + * @issued: hardware notification point + * @tail: cleanup index + * @pending: lock free indicator for issued != head + * @dmacount: identical to 'head' except for occasionally resetting to zero + * @alloc_order: log2 of the number of allocated descriptors + * @ring: software ring buffer implementation of hardware ring + * @ring_lock: protects ring attributes + */ +struct ioat2_dma_chan { + struct ioat_chan_common base; + size_t xfercap_log; + u16 head; + u16 issued; + u16 tail; + u16 dmacount; + u16 alloc_order; + int pending; + struct ioat_ring_ent **ring; + spinlock_t ring_lock; +}; + +static inline struct ioat2_dma_chan *to_ioat2_chan(struct dma_chan *c) +{ + struct ioat_chan_common *chan = to_chan_common(c); + + return container_of(chan, struct ioat2_dma_chan, base); +} + +static inline u16 ioat2_ring_mask(struct ioat2_dma_chan *ioat) +{ + return (1 << ioat->alloc_order) - 1; +} + +/* count of descriptors in flight with the engine */ +static inline u16 ioat2_ring_active(struct ioat2_dma_chan *ioat) +{ + return (ioat->head - ioat->tail) & ioat2_ring_mask(ioat); +} + +/* count of descriptors pending submission to hardware */ +static inline u16 ioat2_ring_pending(struct ioat2_dma_chan *ioat) +{ + return (ioat->head - ioat->issued) & ioat2_ring_mask(ioat); +} + +static inline u16 ioat2_ring_space(struct ioat2_dma_chan *ioat) +{ + u16 num_descs = ioat2_ring_mask(ioat) + 1; + u16 active = ioat2_ring_active(ioat); + + BUG_ON(active > num_descs); + + return num_descs - active; +} + +/* assumes caller already checked space */ +static inline u16 ioat2_desc_alloc(struct ioat2_dma_chan *ioat, u16 len) +{ + ioat->head += len; + return ioat->head - len; +} + +static inline u16 ioat2_xferlen_to_descs(struct ioat2_dma_chan *ioat, size_t len) +{ + u16 num_descs = len >> ioat->xfercap_log; + + num_descs += !!(len & ((1 << ioat->xfercap_log) - 1)); + return num_descs; +} + +struct ioat_ring_ent { + struct ioat_dma_descriptor *hw; + struct dma_async_tx_descriptor txd; + size_t len; +}; + +static inline struct ioat_ring_ent * +ioat2_get_ring_ent(struct ioat2_dma_chan *ioat, u16 idx) +{ + return ioat->ring[idx & ioat2_ring_mask(ioat)]; +} + +int ioat2_dma_probe(struct ioatdma_device *dev, int dca); +int ioat3_dma_probe(struct ioatdma_device *dev, int dca); +struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); +struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); +#endif /* IOATDMA_V2_H */ diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c index 55414d88ac1b..c4e432269252 100644 --- a/drivers/dma/ioat/pci.c +++ b/drivers/dma/ioat/pci.c @@ -31,6 +31,7 @@ #include <linux/interrupt.h> #include <linux/dca.h> #include "dma.h" +#include "dma_v2.h" #include "registers.h" #include "hw.h" |