diff options
Diffstat (limited to 'drivers/infiniband/hw/hfi1/user_sdma.h')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/user_sdma.h | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hfi1/user_sdma.h b/drivers/infiniband/hw/hfi1/user_sdma.h new file mode 100644 index 000000000..548347d4c --- /dev/null +++ b/drivers/infiniband/hw/hfi1/user_sdma.h @@ -0,0 +1,212 @@ +/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */ +/* + * Copyright(c) 2020 - Cornelis Networks, Inc. + * Copyright(c) 2015 - 2018 Intel Corporation. + */ +#ifndef _HFI1_USER_SDMA_H +#define _HFI1_USER_SDMA_H + +#include <linux/device.h> +#include <linux/wait.h> + +#include "common.h" +#include "iowait.h" +#include "user_exp_rcv.h" +#include "mmu_rb.h" + +/* The maximum number of Data io vectors per message/request */ +#define MAX_VECTORS_PER_REQ 8 +/* + * Maximum number of packet to send from each message/request + * before moving to the next one. + */ +#define MAX_PKTS_PER_QUEUE 16 + +#define num_pages(x) (1 + ((((x) - 1) & PAGE_MASK) >> PAGE_SHIFT)) + +#define req_opcode(x) \ + (((x) >> HFI1_SDMA_REQ_OPCODE_SHIFT) & HFI1_SDMA_REQ_OPCODE_MASK) +#define req_version(x) \ + (((x) >> HFI1_SDMA_REQ_VERSION_SHIFT) & HFI1_SDMA_REQ_OPCODE_MASK) +#define req_iovcnt(x) \ + (((x) >> HFI1_SDMA_REQ_IOVCNT_SHIFT) & HFI1_SDMA_REQ_IOVCNT_MASK) + +/* Number of BTH.PSN bits used for sequence number in expected rcvs */ +#define BTH_SEQ_MASK 0x7ffull + +#define AHG_KDETH_INTR_SHIFT 12 +#define AHG_KDETH_SH_SHIFT 13 +#define AHG_KDETH_ARRAY_SIZE 9 + +#define PBC2LRH(x) ((((x) & 0xfff) << 2) - 4) +#define LRH2PBC(x) ((((x) >> 2) + 1) & 0xfff) + +/** + * Build an SDMA AHG header update descriptor and save it to an array. + * @arr - Array to save the descriptor to. + * @idx - Index of the array at which the descriptor will be saved. + * @array_size - Size of the array arr. + * @dw - Update index into the header in DWs. + * @bit - Start bit. + * @width - Field width. + * @value - 16 bits of immediate data to write into the field. + * Returns -ERANGE if idx is invalid. If successful, returns the next index + * (idx + 1) of the array to be used for the next descriptor. + */ +static inline int ahg_header_set(u32 *arr, int idx, size_t array_size, + u8 dw, u8 bit, u8 width, u16 value) +{ + if ((size_t)idx >= array_size) + return -ERANGE; + arr[idx++] = sdma_build_ahg_descriptor(value, dw, bit, width); + return idx; +} + +/* Tx request flag bits */ +#define TXREQ_FLAGS_REQ_ACK BIT(0) /* Set the ACK bit in the header */ +#define TXREQ_FLAGS_REQ_DISABLE_SH BIT(1) /* Disable header suppression */ + +enum pkt_q_sdma_state { + SDMA_PKT_Q_ACTIVE, + SDMA_PKT_Q_DEFERRED, +}; + +#define SDMA_IOWAIT_TIMEOUT 1000 /* in milliseconds */ + +#define SDMA_DBG(req, fmt, ...) \ + hfi1_cdbg(SDMA, "[%u:%u:%u:%u] " fmt, (req)->pq->dd->unit, \ + (req)->pq->ctxt, (req)->pq->subctxt, (req)->info.comp_idx, \ + ##__VA_ARGS__) + +struct hfi1_user_sdma_pkt_q { + u16 ctxt; + u16 subctxt; + u16 n_max_reqs; + atomic_t n_reqs; + u16 reqidx; + struct hfi1_devdata *dd; + struct kmem_cache *txreq_cache; + struct user_sdma_request *reqs; + unsigned long *req_in_use; + struct iowait busy; + enum pkt_q_sdma_state state; + wait_queue_head_t wait; + unsigned long unpinned; + struct mmu_rb_handler *handler; + atomic_t n_locked; +}; + +struct hfi1_user_sdma_comp_q { + u16 nentries; + struct hfi1_sdma_comp_entry *comps; +}; + +struct sdma_mmu_node { + struct mmu_rb_node rb; + struct hfi1_user_sdma_pkt_q *pq; + struct page **pages; + unsigned int npages; +}; + +struct user_sdma_iovec { + struct list_head list; + struct iovec iov; + /* + * offset into the virtual address space of the vector at + * which we last left off. + */ + u64 offset; +}; + +/* evict operation argument */ +struct evict_data { + u32 cleared; /* count evicted so far */ + u32 target; /* target count to evict */ +}; + +struct user_sdma_request { + /* This is the original header from user space */ + struct hfi1_pkt_header hdr; + + /* Read mostly fields */ + struct hfi1_user_sdma_pkt_q *pq ____cacheline_aligned_in_smp; + struct hfi1_user_sdma_comp_q *cq; + /* + * Pointer to the SDMA engine for this request. + * Since different request could be on different VLs, + * each request will need it's own engine pointer. + */ + struct sdma_engine *sde; + struct sdma_req_info info; + /* TID array values copied from the tid_iov vector */ + u32 *tids; + /* total length of the data in the request */ + u32 data_len; + /* number of elements copied to the tids array */ + u16 n_tids; + /* + * We copy the iovs for this request (based on + * info.iovcnt). These are only the data vectors + */ + u8 data_iovs; + s8 ahg_idx; + + /* Writeable fields shared with interrupt */ + u16 seqcomp ____cacheline_aligned_in_smp; + u16 seqsubmitted; + + /* Send side fields */ + struct list_head txps ____cacheline_aligned_in_smp; + u16 seqnum; + /* + * KDETH.OFFSET (TID) field + * The offset can cover multiple packets, depending on the + * size of the TID entry. + */ + u32 tidoffset; + /* + * KDETH.Offset (Eager) field + * We need to remember the initial value so the headers + * can be updated properly. + */ + u32 koffset; + u32 sent; + /* TID index copied from the tid_iov vector */ + u16 tididx; + /* progress index moving along the iovs array */ + u8 iov_idx; + u8 has_error; + + struct user_sdma_iovec iovs[MAX_VECTORS_PER_REQ]; +} ____cacheline_aligned_in_smp; + +/* + * A single txreq could span up to 3 physical pages when the MTU + * is sufficiently large (> 4K). Each of the IOV pointers also + * needs it's own set of flags so the vector has been handled + * independently of each other. + */ +struct user_sdma_txreq { + /* Packet header for the txreq */ + struct hfi1_pkt_header hdr; + struct sdma_txreq txreq; + struct list_head list; + struct user_sdma_request *req; + u16 flags; + u16 seqnum; +}; + +int hfi1_user_sdma_alloc_queues(struct hfi1_ctxtdata *uctxt, + struct hfi1_filedata *fd); +int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd, + struct hfi1_ctxtdata *uctxt); +int hfi1_user_sdma_process_request(struct hfi1_filedata *fd, + struct iovec *iovec, unsigned long dim, + unsigned long *count); + +static inline struct mm_struct *mm_from_sdma_node(struct sdma_mmu_node *node) +{ + return node->rb.handler->mn.mm; +} + +#endif /* _HFI1_USER_SDMA_H */ |