diff options
Diffstat (limited to 'drivers/dma/ioat/dma_v2.c')
| -rw-r--r-- | drivers/dma/ioat/dma_v2.c | 916 |
1 files changed, 0 insertions, 916 deletions
diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c deleted file mode 100644 index 69c7dfcad023..000000000000 --- a/drivers/dma/ioat/dma_v2.c +++ /dev/null @@ -1,916 +0,0 @@ -/* - * 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. - * - * 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/slab.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/prefetch.h> -#include <linux/i7300_idle.h> -#include "dma.h" -#include "dma_v2.h" -#include "registers.h" -#include "hw.h" - -#include "../dmaengine.h" - -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: 8 max: 16)"); -static int ioat_ring_max_alloc_order = IOAT_MAX_ORDER; -module_param(ioat_ring_max_alloc_order, int, 0644); -MODULE_PARM_DESC(ioat_ring_max_alloc_order, - "ioat2+: upper limit for ring size (default: 16)"); - -void __ioat2_issue_pending(struct ioat2_dma_chan *ioat) -{ - struct ioat_chan_common *chan = &ioat->base; - - ioat->dmacount += ioat2_ring_pending(ioat); - ioat->issued = ioat->head; - writew(ioat->dmacount, chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET); - dev_dbg(to_dev(chan), - "%s: head: %#x tail: %#x issued: %#x count: %#x\n", - __func__, ioat->head, ioat->tail, ioat->issued, ioat->dmacount); -} - -void ioat2_issue_pending(struct dma_chan *c) -{ - struct ioat2_dma_chan *ioat = to_ioat2_chan(c); - - if (ioat2_ring_pending(ioat)) { - spin_lock_bh(&ioat->prep_lock); - __ioat2_issue_pending(ioat); - spin_unlock_bh(&ioat->prep_lock); - } -} - -/** - * ioat2_update_pending - log pending descriptors - * @ioat: ioat2+ channel - * - * Check if the number of unsubmitted descriptors has exceeded the - * watermark. Called with prep_lock held - */ -static void ioat2_update_pending(struct ioat2_dma_chan *ioat) -{ - if (ioat2_ring_pending(ioat) > ioat_pending_level) - __ioat2_issue_pending(ioat); -} - -static void __ioat2_start_null_desc(struct ioat2_dma_chan *ioat) -{ - struct ioat_ring_ent *desc; - struct ioat_dma_descriptor *hw; - - if (ioat2_ring_space(ioat) < 1) { - dev_err(to_dev(&ioat->base), - "Unable to start null desc - ring full\n"); - return; - } - - dev_dbg(to_dev(&ioat->base), "%s: head: %#x tail: %#x issued: %#x\n", - __func__, ioat->head, ioat->tail, ioat->issued); - desc = ioat2_get_ring_ent(ioat, ioat->head); - - 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); - ioat2_set_chainaddr(ioat, desc->txd.phys); - dump_desc_dbg(ioat, desc); - wmb(); - ioat->head += 1; - __ioat2_issue_pending(ioat); -} - -static void ioat2_start_null_desc(struct ioat2_dma_chan *ioat) -{ - spin_lock_bh(&ioat->prep_lock); - __ioat2_start_null_desc(ioat); - spin_unlock_bh(&ioat->prep_lock); -} - -static void __cleanup(struct ioat2_dma_chan *ioat, dma_addr_t phys_complete) -{ - struct ioat_chan_common *chan = &ioat->base; - struct dma_async_tx_descriptor *tx; - struct ioat_ring_ent *desc; - bool seen_current = false; - u16 active; - int idx = ioat->tail, i; - - dev_dbg(to_dev(chan), "%s: head: %#x tail: %#x issued: %#x\n", - __func__, ioat->head, ioat->tail, ioat->issued); - - active = ioat2_ring_active(ioat); - for (i = 0; i < active && !seen_current; i++) { - smp_read_barrier_depends(); - prefetch(ioat2_get_ring_ent(ioat, idx + i + 1)); - desc = ioat2_get_ring_ent(ioat, idx + i); - tx = &desc->txd; - dump_desc_dbg(ioat, desc); - if (tx->cookie) { - dma_descriptor_unmap(tx); - dma_cookie_complete(tx); - if (tx->callback) { - tx->callback(tx->callback_param); - tx->callback = NULL; - } - } - - if (tx->phys == phys_complete) - seen_current = true; - } - 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; - 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); - } -} - -/** - * 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; - dma_addr_t phys_complete; - - spin_lock_bh(&chan->cleanup_lock); - if (ioat_cleanup_preamble(chan, &phys_complete)) - __cleanup(ioat, phys_complete); - spin_unlock_bh(&chan->cleanup_lock); -} - -void ioat2_cleanup_event(unsigned long data) -{ - struct ioat2_dma_chan *ioat = to_ioat2_chan((void *) data); - struct ioat_chan_common *chan = &ioat->base; - - ioat2_cleanup(ioat); - if (!test_bit(IOAT_RUN, &chan->state)) - return; - writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); -} - -void __ioat2_restart_chan(struct ioat2_dma_chan *ioat) -{ - struct ioat_chan_common *chan = &ioat->base; - - /* set the tail to be re-issued */ - ioat->issued = ioat->tail; - ioat->dmacount = 0; - set_bit(IOAT_COMPLETION_PENDING, &chan->state); - mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); - - dev_dbg(to_dev(chan), - "%s: head: %#x tail: %#x issued: %#x count: %#x\n", - __func__, ioat->head, ioat->tail, ioat->issued, ioat->dmacount); - - if (ioat2_ring_pending(ioat)) { - struct ioat_ring_ent *desc; - - desc = ioat2_get_ring_ent(ioat, ioat->tail); - ioat2_set_chainaddr(ioat, desc->txd.phys); - __ioat2_issue_pending(ioat); - } else - __ioat2_start_null_desc(ioat); -} - -int ioat2_quiesce(struct ioat_chan_common *chan, unsigned long tmo) -{ - unsigned long end = jiffies + tmo; - int err = 0; - u32 status; - - status = ioat_chansts(chan); - if (is_ioat_active(status) || is_ioat_idle(status)) - ioat_suspend(chan); - while (is_ioat_active(status) || is_ioat_idle(status)) { - if (tmo && time_after(jiffies, end)) { - err = -ETIMEDOUT; - break; - } - status = ioat_chansts(chan); - cpu_relax(); - } - - return err; -} - -int ioat2_reset_sync(struct ioat_chan_common *chan, unsigned long tmo) -{ - unsigned long end = jiffies + tmo; - int err = 0; - - ioat_reset(chan); - while (ioat_reset_pending(chan)) { - if (end && time_after(jiffies, end)) { - err = -ETIMEDOUT; - break; - } - cpu_relax(); - } - - return err; -} - -static void ioat2_restart_channel(struct ioat2_dma_chan *ioat) -{ - struct ioat_chan_common *chan = &ioat->base; - dma_addr_t phys_complete; - - ioat2_quiesce(chan, 0); - if (ioat_cleanup_preamble(chan, &phys_complete)) - __cleanup(ioat, phys_complete); - - __ioat2_restart_chan(ioat); -} - -static void check_active(struct ioat2_dma_chan *ioat) -{ - struct ioat_chan_common *chan = &ioat->base; - - if (ioat2_ring_active(ioat)) { - mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); - return; - } - - if (test_and_clear_bit(IOAT_CHAN_ACTIVE, &chan->state)) - mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); - else if (ioat->alloc_order > ioat_get_alloc_order()) { - /* if the ring is idle, empty, and oversized try to step - * down the size - */ - reshape_ring(ioat, ioat->alloc_order - 1); - - /* keep shrinking until we get back to our minimum - * default size - */ - if (ioat->alloc_order > ioat_get_alloc_order()) - mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); - } - -} - -void ioat2_timer_event(unsigned long data) -{ - struct ioat2_dma_chan *ioat = to_ioat2_chan((void *) data); - struct ioat_chan_common *chan = &ioat->base; - dma_addr_t phys_complete; - u64 status; - - status = ioat_chansts(chan); - - /* when halted due to errors check for channel - * programming errors before advancing the completion state - */ - if (is_ioat_halted(status)) { - u32 chanerr; - - chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); - dev_err(to_dev(chan), "%s: Channel halted (%x)\n", - __func__, chanerr); - if (test_bit(IOAT_RUN, &chan->state)) - BUG_ON(is_ioat_bug(chanerr)); - else /* we never got off the ground */ - return; - } - - /* if we haven't made progress and we have already - * 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)) { - spin_lock_bh(&ioat->prep_lock); - ioat2_restart_channel(ioat); - spin_unlock_bh(&ioat->prep_lock); - spin_unlock_bh(&chan->cleanup_lock); - return; - } else { - set_bit(IOAT_COMPLETION_ACK, &chan->state); - mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); - } - - - if (ioat2_ring_active(ioat)) - mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); - else { - spin_lock_bh(&ioat->prep_lock); - check_active(ioat); - spin_unlock_bh(&ioat->prep_lock); - } - spin_unlock_bh(&chan->cleanup_lock); -} - -static int ioat2_reset_hw(struct ioat_chan_common *chan) -{ - /* throw away whatever the channel was doing and get it initialized */ - u32 chanerr; - - ioat2_quiesce(chan, msecs_to_jiffies(100)); - - chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); - writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); - - return ioat2_reset_sync(chan, msecs_to_jiffies(200)); -} - -/** - * ioat2_enumerate_channels - find and initialize the device's channels - * @device: the device to be enumerated - */ -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); - dma->chancnt &= 0x1f; /* bits [4:0] valid */ - if (dma->chancnt > ARRAY_SIZE(device->idx)) { - dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n", - dma->chancnt, ARRAY_SIZE(device->idx)); - dma->chancnt = ARRAY_SIZE(device->idx); - } - xfercap_log = readb(device->reg_base + IOAT_XFERCAP_OFFSET); - xfercap_log &= 0x1f; /* bits [4:0] valid */ - if (xfercap_log == 0) - return 0; - dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log); - - /* 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); - ioat->xfercap_log = xfercap_log; - spin_lock_init(&ioat->prep_lock); - if (device->reset_hw(&ioat->base)) { - i = 0; - break; - } - } - 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); - struct ioat_chan_common *chan = &ioat->base; - dma_cookie_t cookie; - - cookie = dma_cookie_assign(tx); - dev_dbg(to_dev(&ioat->base), "%s: cookie: %d\n", __func__, cookie); - - if (!test_and_set_bit(IOAT_CHAN_ACTIVE, &chan->state)) - mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); - - /* make descriptor updates visible before advancing ioat->head, - * this is purposefully not smp_wmb() since we are also - * publishing the descriptor updates to a dma device - */ - wmb(); - - ioat->head += ioat->produce; - - ioat2_update_pending(ioat); - spin_unlock_bh(&ioat->prep_lock); - - return cookie; -} - -static struct ioat_ring_ent *ioat2_alloc_ring_ent(struct dma_chan *chan, gfp_t flags) -{ - 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, flags, &phys); - if (!hw) - return NULL; - memset(hw, 0, sizeof(*hw)); - - desc = kmem_cache_zalloc(ioat2_cache, flags); - 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); - kmem_cache_free(ioat2_cache, desc); -} - -static struct ioat_ring_ent **ioat2_alloc_ring(struct dma_chan *c, int order, gfp_t flags) -{ - struct ioat_ring_ent **ring; - int descs = 1 << order; - int i; - - if (order > ioat_get_max_alloc_order()) - return NULL; - - /* allocate the array to hold the software ring */ - ring = kcalloc(descs, sizeof(*ring), flags); - if (!ring) - return NULL; - for (i = 0; i < descs; i++) { - ring[i] = ioat2_alloc_ring_ent(c, flags); - if (!ring[i]) { - while (i--) - ioat2_free_ring_ent(ring[i], c); - kfree(ring); - return NULL; - } - set_desc_id(ring[i], i); - } - - /* 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; - - return ring; -} - -void ioat2_free_chan_resources(struct dma_chan *c); - -/* ioat2_alloc_chan_resources - allocate/initialize ioat2 descriptor ring - * @chan: channel to be initialized - */ -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; - u64 status; - int order; - int i = 0; - - /* have we already been set up? */ - if (ioat->ring) - return 1 << ioat->alloc_order; - - /* Setup register to interrupt and write completion status on error */ - writew(IOAT_CHANCTRL_RUN, chan->reg_base + IOAT_CHANCTRL_OFFSET); - - /* allocate a completion writeback area */ - /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ - chan->completion = pci_pool_alloc(chan->device->completion_pool, - GFP_KERNEL, &chan->completion_dma); - if (!chan->completion) - return -ENOMEM; - - memset(chan->completion, 0, sizeof(*chan->completion)); - writel(((u64) chan->completion_dma) & 0x00000000FFFFFFFF, - chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); - writel(((u64) chan->completion_dma) >> 32, - chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); - - order = ioat_get_alloc_order(); - ring = ioat2_alloc_ring(c, order, GFP_KERNEL); - if (!ring) - return -ENOMEM; - - spin_lock_bh(&chan->cleanup_lock); - spin_lock_bh(&ioat->prep_lock); - ioat->ring = ring; - ioat->head = 0; - ioat->issued = 0; - ioat->tail = 0; - ioat->alloc_order = order; - set_bit(IOAT_RUN, &chan->state); - spin_unlock_bh(&ioat->prep_lock); - spin_unlock_bh(&chan->cleanup_lock); - - ioat2_start_null_desc(ioat); - - /* check that we got off the ground */ - do { - udelay(1); - status = ioat_chansts(chan); - } while (i++ < 20 && !is_ioat_active(status) && !is_ioat_idle(status)); - - if (is_ioat_active(status) || is_ioat_idle(status)) { - return 1 << ioat->alloc_order; - } else { - u32 chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); - - dev_WARN(to_dev(chan), - "failed to start channel chanerr: %#x\n", chanerr); - ioat2_free_chan_resources(c); - return -EFAULT; - } -} - -bool reshape_ring(struct ioat2_dma_chan *ioat, int order) -{ - /* reshape differs from normal ring allocation in that we want - * to allocate a new software ring while only - * extending/truncating the hardware ring - */ - struct ioat_chan_common *chan = &ioat->base; - struct dma_chan *c = &chan->common; - const u32 curr_size = ioat2_ring_size(ioat); - const u16 active = ioat2_ring_active(ioat); - const u32 new_size = 1 << order; - struct ioat_ring_ent **ring; - u16 i; - - if (order > ioat_get_max_alloc_order()) - return false; - - /* double check that we have at least 1 free descriptor */ - if (active == curr_size) - return false; - - /* when shrinking, verify that we can hold the current active - * set in the new ring - */ - if (active >= new_size) - return false; - - /* allocate the array to hold the software ring */ - ring = kcalloc(new_size, sizeof(*ring), GFP_NOWAIT); - if (!ring) - return false; - - /* allocate/trim descriptors as needed */ - if (new_size > curr_size) { - /* copy current descriptors to the new ring */ - for (i = 0; i < curr_size; i++) { - u16 curr_idx = (ioat->tail+i) & (curr_size-1); - u16 new_idx = (ioat->tail+i) & (new_size-1); - - ring[new_idx] = ioat->ring[curr_idx]; - set_desc_id(ring[new_idx], new_idx); - } - - /* add new descriptors to the ring */ - for (i = curr_size; i < new_size; i++) { - u16 new_idx = (ioat->tail+i) & (new_size-1); - - ring[new_idx] = ioat2_alloc_ring_ent(c, GFP_NOWAIT); - if (!ring[new_idx]) { - while (i--) { - u16 new_idx = (ioat->tail+i) & (new_size-1); - - ioat2_free_ring_ent(ring[new_idx], c); - } - kfree(ring); - return false; - } - set_desc_id(ring[new_idx], new_idx); - } - - /* hw link new descriptors */ - for (i = curr_size-1; i < new_size; i++) { - u16 new_idx = (ioat->tail+i) & (new_size-1); - struct ioat_ring_ent *next = ring[(new_idx+1) & (new_size-1)]; - struct ioat_dma_descriptor *hw = ring[new_idx]->hw; - - hw->next = next->txd.phys; - } - } else { - struct ioat_dma_descriptor *hw; - struct ioat_ring_ent *next; - - /* copy current descriptors to the new ring, dropping the - * removed descriptors - */ - for (i = 0; i < new_size; i++) { - u16 curr_idx = (ioat->tail+i) & (curr_size-1); - u16 new_idx = (ioat->tail+i) & (new_size-1); - - ring[new_idx] = ioat->ring[curr_idx]; - set_desc_id(ring[new_idx], new_idx); - } - - /* free deleted descriptors */ - for (i = new_size; i < curr_size; i++) { - struct ioat_ring_ent *ent; - - ent = ioat2_get_ring_ent(ioat, ioat->tail+i); - ioat2_free_ring_ent(ent, c); - } - - /* fix up hardware ring */ - hw = ring[(ioat->tail+new_size-1) & (new_size-1)]->hw; - next = ring[(ioat->tail+new_size) & (new_size-1)]; - hw->next = next->txd.phys; - } - - dev_dbg(to_dev(chan), "%s: allocated %d descriptors\n", - __func__, new_size); - - kfree(ioat->ring); - ioat->ring = ring; - ioat->alloc_order = order; - - return true; -} - -/** - * ioat2_check_space_lock - verify space and grab ring producer lock - * @ioat: ioat2,3 channel (ring) to operate on - * @num_descs: allocation length - */ -int ioat2_check_space_lock(struct ioat2_dma_chan *ioat, int num_descs) -{ - struct ioat_chan_common *chan = &ioat->base; - bool retry; - - retry: - spin_lock_bh(&ioat->prep_lock); - /* never allow the last descriptor to be consumed, we need at - * least one free at all times to allow for on-the-fly ring - * resizing. - */ - if (likely(ioat2_ring_space(ioat) > num_descs)) { - dev_dbg(to_dev(chan), "%s: num_descs: %d (%x:%x:%x)\n", - __func__, num_descs, ioat->head, ioat->tail, ioat->issued); - ioat->produce = num_descs; - return 0; /* with ioat->prep_lock held */ - } - retry = test_and_set_bit(IOAT_RESHAPE_PENDING, &chan->state); - spin_unlock_bh(&ioat->prep_lock); - - /* is another cpu already trying to expand the ring? */ - if (retry) - goto retry; - - spin_lock_bh(&chan->cleanup_lock); - spin_lock_bh(&ioat->prep_lock); - retry = reshape_ring(ioat, ioat->alloc_order + 1); - clear_bit(IOAT_RESHAPE_PENDING, &chan->state); - spin_unlock_bh(&ioat->prep_lock); - spin_unlock_bh(&chan->cleanup_lock); - - /* if we were able to expand the ring retry the allocation */ - if (retry) - goto retry; - - 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); - - /* progress reclaim in the allocation failure case we may be - * called under bh_disabled so we need to trigger the timer - * event directly - */ - if (time_is_before_jiffies(chan->timer.expires) - && timer_pending(&chan->timer)) { - struct ioatdma_device *device = chan->device; - - mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); - device->timer_fn((unsigned long) &chan->common); - } - - return -ENOMEM; -} - -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, idx, i; - - num_descs = ioat2_xferlen_to_descs(ioat, len); - if (likely(num_descs) && ioat2_check_space_lock(ioat, num_descs) == 0) - idx = ioat->head; - else - return NULL; - i = 0; - do { - 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; - dump_desc_dbg(ioat, desc); - } while (++i < num_descs); - - desc->txd.flags = flags; - desc->len = total_len; - hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); - hw->ctl_f.fence = !!(flags & DMA_PREP_FENCE); - hw->ctl_f.compl_write = 1; - dump_desc_dbg(ioat, desc); - /* 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 - */ -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 *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; - - ioat_stop(chan); - device->reset_hw(chan); - - spin_lock_bh(&chan->cleanup_lock); - spin_lock_bh(&ioat->prep_lock); - descs = ioat2_ring_space(ioat); - dev_dbg(to_dev(chan), "freeing %d idle descriptors\n", descs); - 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); - dump_desc_dbg(ioat, desc); - ioat2_free_ring_ent(desc, c); - } - - kfree(ioat->ring); - ioat->ring = NULL; - ioat->alloc_order = 0; - pci_pool_free(device->completion_pool, chan->completion, - chan->completion_dma); - spin_unlock_bh(&ioat->prep_lock); - spin_unlock_bh(&chan->cleanup_lock); - - chan->last_completion = 0; - chan->completion_dma = 0; - ioat->dmacount = 0; -} - -static ssize_t ring_size_show(struct dma_chan *c, char *page) -{ - struct ioat2_dma_chan *ioat = to_ioat2_chan(c); - - return sprintf(page, "%d\n", (1 << ioat->alloc_order) & ~1); -} -static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size); - -static ssize_t ring_active_show(struct dma_chan *c, char *page) -{ - struct ioat2_dma_chan *ioat = to_ioat2_chan(c); - - /* ...taken outside the lock, no need to be precise */ - return sprintf(page, "%d\n", ioat2_ring_active(ioat)); -} -static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active); - -static struct attribute *ioat2_attrs[] = { - &ring_size_attr.attr, - &ring_active_attr.attr, - &ioat_cap_attr.attr, - &ioat_version_attr.attr, - NULL, -}; - -struct kobj_type ioat2_ktype = { - .sysfs_ops = &ioat_sysfs_ops, - .default_attrs = ioat2_attrs, -}; - -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; - device->reset_hw = ioat2_reset_hw; - device->cleanup_fn = ioat2_cleanup_event; - device->timer_fn = ioat2_timer_event; - device->self_test = ioat_dma_self_test; - 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_tx_status = ioat_dma_tx_status; - - err = ioat_probe(device); - if (err) - return err; - - 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; - - ioat_kobject_add(device, &ioat2_ktype); - - if (dca) - device->dca = ioat2_dca_init(pdev, device->reg_base); - - return err; -} |