diff options
Diffstat (limited to 'drivers/dma/ioat/dma_v2.h')
| -rw-r--r-- | drivers/dma/ioat/dma_v2.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h new file mode 100644 index 000000000000..1d849ef74d5f --- /dev/null +++ b/drivers/dma/ioat/dma_v2.h @@ -0,0 +1,190 @@ +/* + * 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; +extern int ioat_ring_alloc_order; + +/* + * 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)) +#define ioat_get_max_alloc_order() \ + (min(ioat_ring_max_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 - wrapper around hardware descriptor + * @hw: hardware DMA descriptor (for memcpy) + * @fill: hardware fill descriptor + * @xor: hardware xor descriptor + * @xor_ex: hardware xor extension descriptor + * @pq: hardware pq descriptor + * @pq_ex: hardware pq extension descriptor + * @pqu: hardware pq update descriptor + * @raw: hardware raw (un-typed) descriptor + * @txd: the generic software descriptor for all engines + * @len: total transaction length for unmap + * @result: asynchronous result of validate operations + * @id: identifier for debug + */ + +struct ioat_ring_ent { + union { + struct ioat_dma_descriptor *hw; + struct ioat_fill_descriptor *fill; + struct ioat_xor_descriptor *xor; + struct ioat_xor_ext_descriptor *xor_ex; + struct ioat_pq_descriptor *pq; + struct ioat_pq_ext_descriptor *pq_ex; + struct ioat_pq_update_descriptor *pqu; + struct ioat_raw_descriptor *raw; + }; + size_t len; + struct dma_async_tx_descriptor txd; + enum sum_check_flags *result; + #ifdef DEBUG + int id; + #endif +}; + +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)]; +} + +static inline void ioat2_set_chainaddr(struct ioat2_dma_chan *ioat, u64 addr) +{ + struct ioat_chan_common *chan = &ioat->base; + + writel(addr & 0x00000000FFFFFFFF, + chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); + writel(addr >> 32, + chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); +} + +int __devinit ioat2_dma_probe(struct ioatdma_device *dev, int dca); +int __devinit ioat3_dma_probe(struct ioatdma_device *dev, int dca); +struct dca_provider * __devinit ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); +struct dca_provider * __devinit ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); +int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_descs); +int ioat2_enumerate_channels(struct ioatdma_device *device); +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); +void ioat2_issue_pending(struct dma_chan *chan); +int ioat2_alloc_chan_resources(struct dma_chan *c); +void ioat2_free_chan_resources(struct dma_chan *c); +enum dma_status ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used); +void __ioat2_restart_chan(struct ioat2_dma_chan *ioat); +bool reshape_ring(struct ioat2_dma_chan *ioat, int order); +void __ioat2_issue_pending(struct ioat2_dma_chan *ioat); +void ioat2_cleanup_tasklet(unsigned long data); +void ioat2_timer_event(unsigned long data); +extern struct kobj_type ioat2_ktype; +extern struct kmem_cache *ioat2_cache; +#endif /* IOATDMA_V2_H */ |
