329 lines
13 KiB
C
329 lines
13 KiB
C
|
#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 */
|