| #ifndef _PIO_H |
| #define _PIO_H |
| /* |
| * Copyright(c) 2015, 2016 Intel Corporation. |
| * |
| * This file is provided under a dual BSD/GPLv2 license. When using or |
| * redistributing this file, you may do so under either license. |
| * |
| * GPL LICENSE SUMMARY |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of version 2 of the GNU General Public License 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. |
| * |
| * BSD LICENSE |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * - Neither the name of Intel Corporation nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| /* send context types */ |
| #define SC_KERNEL 0 |
| #define SC_VL15 1 |
| #define SC_ACK 2 |
| #define SC_USER 3 /* must be the last one: it may take all left */ |
| #define SC_MAX 4 /* count of send context types */ |
| |
| /* invalid send context index */ |
| #define INVALID_SCI 0xff |
| |
| /* PIO buffer release callback function */ |
| typedef void (*pio_release_cb)(void *arg, int code); |
| |
| /* PIO release codes - in bits, as there could more than one that apply */ |
| #define PRC_OK 0 /* no known error */ |
| #define PRC_STATUS_ERR 0x01 /* credit return due to status error */ |
| #define PRC_PBC 0x02 /* credit return due to PBC */ |
| #define PRC_THRESHOLD 0x04 /* credit return due to threshold */ |
| #define PRC_FILL_ERR 0x08 /* credit return due fill error */ |
| #define PRC_FORCE 0x10 /* credit return due credit force */ |
| #define PRC_SC_DISABLE 0x20 /* clean-up after a context disable */ |
| |
| /* byte helper */ |
| union mix { |
| u64 val64; |
| u32 val32[2]; |
| u8 val8[8]; |
| }; |
| |
| /* an allocated PIO buffer */ |
| struct pio_buf { |
| struct send_context *sc;/* back pointer to owning send context */ |
| pio_release_cb cb; /* called when the buffer is released */ |
| void *arg; /* argument for cb */ |
| void __iomem *start; /* buffer start address */ |
| void __iomem *end; /* context end address */ |
| unsigned long size; /* context size, in bytes */ |
| unsigned long sent_at; /* buffer is sent when <= free */ |
| u32 block_count; /* size of buffer, in blocks */ |
| u32 qw_written; /* QW written so far */ |
| u32 carry_bytes; /* number of valid bytes in carry */ |
| union mix carry; /* pending unwritten bytes */ |
| }; |
| |
| /* cache line aligned pio buffer array */ |
| union pio_shadow_ring { |
| struct pio_buf pbuf; |
| u64 unused[16]; /* cache line spacer */ |
| } ____cacheline_aligned; |
| |
| /* per-NUMA send context */ |
| struct send_context { |
| /* read-only after init */ |
| struct hfi1_devdata *dd; /* device */ |
| void __iomem *base_addr; /* start of PIO memory */ |
| union pio_shadow_ring *sr; /* shadow ring */ |
| |
| volatile __le64 *hw_free; /* HW free counter */ |
| struct work_struct halt_work; /* halted context work queue entry */ |
| unsigned long flags; /* flags */ |
| int node; /* context home node */ |
| int type; /* context type */ |
| u32 sw_index; /* software index number */ |
| u32 hw_context; /* hardware context number */ |
| u32 credits; /* number of blocks in context */ |
| u32 sr_size; /* size of the shadow ring */ |
| u32 group; /* credit return group */ |
| /* allocator fields */ |
| spinlock_t alloc_lock ____cacheline_aligned_in_smp; |
| unsigned long fill; /* official alloc count */ |
| unsigned long alloc_free; /* copy of free (less cache thrash) */ |
| u32 sr_head; /* shadow ring head */ |
| /* releaser fields */ |
| spinlock_t release_lock ____cacheline_aligned_in_smp; |
| unsigned long free; /* official free count */ |
| u32 sr_tail; /* shadow ring tail */ |
| /* list for PIO waiters */ |
| struct list_head piowait ____cacheline_aligned_in_smp; |
| spinlock_t credit_ctrl_lock ____cacheline_aligned_in_smp; |
| u64 credit_ctrl; /* cache for credit control */ |
| u32 credit_intr_count; /* count of credit intr users */ |
| u32 __percpu *buffers_allocated;/* count of buffers allocated */ |
| wait_queue_head_t halt_wait; /* wait until kernel sees interrupt */ |
| }; |
| |
| /* send context flags */ |
| #define SCF_ENABLED 0x01 |
| #define SCF_IN_FREE 0x02 |
| #define SCF_HALTED 0x04 |
| #define SCF_FROZEN 0x08 |
| |
| struct send_context_info { |
| struct send_context *sc; /* allocated working context */ |
| u16 allocated; /* has this been allocated? */ |
| u16 type; /* context type */ |
| u16 base; /* base in PIO array */ |
| u16 credits; /* size in PIO array */ |
| }; |
| |
| /* DMA credit return, index is always (context & 0x7) */ |
| struct credit_return { |
| volatile __le64 cr[8]; |
| }; |
| |
| /* NUMA indexed credit return array */ |
| struct credit_return_base { |
| struct credit_return *va; |
| dma_addr_t dma; |
| }; |
| |
| /* send context configuration sizes (one per type) */ |
| struct sc_config_sizes { |
| short int size; |
| short int count; |
| }; |
| |
| /* |
| * The diagram below details the relationship of the mapping structures |
| * |
| * Since the mapping now allows for non-uniform send contexts per vl, the |
| * number of send contexts for a vl is either the vl_scontexts[vl] or |
| * a computation based on num_kernel_send_contexts/num_vls: |
| * |
| * For example: |
| * nactual = vl_scontexts ? vl_scontexts[vl] : num_kernel_send_contexts/num_vls |
| * |
| * n = roundup to next highest power of 2 using nactual |
| * |
| * In the case where there are num_kernel_send_contexts/num_vls doesn't divide |
| * evenly, the extras are added from the last vl downward. |
| * |
| * For the case where n > nactual, the send contexts are assigned |
| * in a round robin fashion wrapping back to the first send context |
| * for a particular vl. |
| * |
| * dd->pio_map |
| * | pio_map_elem[0] |
| * | +--------------------+ |
| * v | mask | |
| * pio_vl_map |--------------------| |
| * +--------------------------+ | ksc[0] -> sc 1 | |
| * | list (RCU) | |--------------------| |
| * |--------------------------| ->| ksc[1] -> sc 2 | |
| * | mask | --/ |--------------------| |
| * |--------------------------| -/ | * | |
| * | actual_vls (max 8) | -/ |--------------------| |
| * |--------------------------| --/ | ksc[n] -> sc n | |
| * | vls (max 8) | -/ +--------------------+ |
| * |--------------------------| --/ |
| * | map[0] |-/ |
| * |--------------------------| +--------------------+ |
| * | map[1] |--- | mask | |
| * |--------------------------| \---- |--------------------| |
| * | * | \-- | ksc[0] -> sc 1+n | |
| * | * | \---- |--------------------| |
| * | * | \->| ksc[1] -> sc 2+n | |
| * |--------------------------| |--------------------| |
| * | map[vls - 1] |- | * | |
| * +--------------------------+ \- |--------------------| |
| * \- | ksc[m] -> sc m+n | |
| * \ +--------------------+ |
| * \- |
| * \ |
| * \- +--------------------+ |
| * \- | mask | |
| * \ |--------------------| |
| * \- | ksc[0] -> sc 1+m+n | |
| * \- |--------------------| |
| * >| ksc[1] -> sc 2+m+n | |
| * |--------------------| |
| * | * | |
| * |--------------------| |
| * | ksc[o] -> sc o+m+n | |
| * +--------------------+ |
| * |
| */ |
| |
| /* Initial number of send contexts per VL */ |
| #define INIT_SC_PER_VL 2 |
| |
| /* |
| * struct pio_map_elem - mapping for a vl |
| * @mask - selector mask |
| * @ksc - array of kernel send contexts for this vl |
| * |
| * The mask is used to "mod" the selector to |
| * produce index into the trailing array of |
| * kscs |
| */ |
| struct pio_map_elem { |
| u32 mask; |
| struct send_context *ksc[0]; |
| }; |
| |
| /* |
| * struct pio_vl_map - mapping for a vl |
| * @list - rcu head for free callback |
| * @mask - vl mask to "mod" the vl to produce an index to map array |
| * @actual_vls - number of vls |
| * @vls - numbers of vls rounded to next power of 2 |
| * @map - array of pio_map_elem entries |
| * |
| * This is the parent mapping structure. The trailing members of the |
| * struct point to pio_map_elem entries, which in turn point to an |
| * array of kscs for that vl. |
| */ |
| struct pio_vl_map { |
| struct rcu_head list; |
| u32 mask; |
| u8 actual_vls; |
| u8 vls; |
| struct pio_map_elem *map[0]; |
| }; |
| |
| int pio_map_init(struct hfi1_devdata *dd, u8 port, u8 num_vls, |
| u8 *vl_scontexts); |
| void free_pio_map(struct hfi1_devdata *dd); |
| struct send_context *pio_select_send_context_vl(struct hfi1_devdata *dd, |
| u32 selector, u8 vl); |
| struct send_context *pio_select_send_context_sc(struct hfi1_devdata *dd, |
| u32 selector, u8 sc5); |
| |
| /* send context functions */ |
| int init_credit_return(struct hfi1_devdata *dd); |
| void free_credit_return(struct hfi1_devdata *dd); |
| int init_sc_pools_and_sizes(struct hfi1_devdata *dd); |
| int init_send_contexts(struct hfi1_devdata *dd); |
| int init_credit_return(struct hfi1_devdata *dd); |
| int init_pervl_scs(struct hfi1_devdata *dd); |
| struct send_context *sc_alloc(struct hfi1_devdata *dd, int type, |
| uint hdrqentsize, int numa); |
| void sc_free(struct send_context *sc); |
| int sc_enable(struct send_context *sc); |
| void sc_disable(struct send_context *sc); |
| int sc_restart(struct send_context *sc); |
| void sc_return_credits(struct send_context *sc); |
| void sc_flush(struct send_context *sc); |
| void sc_drop(struct send_context *sc); |
| void sc_stop(struct send_context *sc, int bit); |
| struct pio_buf *sc_buffer_alloc(struct send_context *sc, u32 dw_len, |
| pio_release_cb cb, void *arg); |
| void sc_release_update(struct send_context *sc); |
| void sc_return_credits(struct send_context *sc); |
| void sc_group_release_update(struct hfi1_devdata *dd, u32 hw_context); |
| void sc_add_credit_return_intr(struct send_context *sc); |
| void sc_del_credit_return_intr(struct send_context *sc); |
| void sc_set_cr_threshold(struct send_context *sc, u32 new_threshold); |
| u32 sc_percent_to_threshold(struct send_context *sc, u32 percent); |
| u32 sc_mtu_to_threshold(struct send_context *sc, u32 mtu, u32 hdrqentsize); |
| void hfi1_sc_wantpiobuf_intr(struct send_context *sc, u32 needint); |
| void sc_wait(struct hfi1_devdata *dd); |
| void set_pio_integrity(struct send_context *sc); |
| |
| /* support functions */ |
| void pio_reset_all(struct hfi1_devdata *dd); |
| void pio_freeze(struct hfi1_devdata *dd); |
| void pio_kernel_unfreeze(struct hfi1_devdata *dd); |
| |
| /* global PIO send control operations */ |
| #define PSC_GLOBAL_ENABLE 0 |
| #define PSC_GLOBAL_DISABLE 1 |
| #define PSC_GLOBAL_VLARB_ENABLE 2 |
| #define PSC_GLOBAL_VLARB_DISABLE 3 |
| #define PSC_CM_RESET 4 |
| #define PSC_DATA_VL_ENABLE 5 |
| #define PSC_DATA_VL_DISABLE 6 |
| |
| void __cm_reset(struct hfi1_devdata *dd, u64 sendctrl); |
| void pio_send_control(struct hfi1_devdata *dd, int op); |
| |
| /* PIO copy routines */ |
| void pio_copy(struct hfi1_devdata *dd, struct pio_buf *pbuf, u64 pbc, |
| const void *from, size_t count); |
| void seg_pio_copy_start(struct pio_buf *pbuf, u64 pbc, |
| const void *from, size_t nbytes); |
| void seg_pio_copy_mid(struct pio_buf *pbuf, const void *from, size_t nbytes); |
| void seg_pio_copy_end(struct pio_buf *pbuf); |
| |
| #endif /* _PIO_H */ |
