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https://github.com/projectacrn/acrn-hypervisor.git
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17f94605f0
For an IO request, hv will check if it was registered in asyncio desc list. If yes, put the corresponding fd to the shared buffer. If the shared buffer is full, yield the vcpu and try again later. Tracked-On: #8209 Signed-off-by: Conghui <conghui.chen@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>
103 lines
2.3 KiB
C
103 lines
2.3 KiB
C
/*
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* SHARED BUFFER
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*
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* Copyright (C) 2017-2022 Intel Corporation.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Li Fei <fei1.li@intel.com>
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*
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*/
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#include <types.h>
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#include <rtl.h>
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#include <errno.h>
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#include <asm/cpu.h>
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#include <asm/per_cpu.h>
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uint32_t sbuf_next_ptr(uint32_t pos_arg,
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uint32_t span, uint32_t scope)
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{
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uint32_t pos = pos_arg;
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pos += span;
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pos = (pos >= scope) ? (pos - scope) : pos;
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return pos;
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}
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/**
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* The high caller should guarantee each time there must have
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* sbuf->ele_size data can be write form data and this function
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* should guarantee execution atomically.
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*
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* flag:
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* If OVERWRITE_EN set, buf can store (ele_num - 1) elements at most.
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* Should use lock to guarantee that only one read or write at
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* the same time.
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* if OVERWRITE_EN not set, buf can store (ele_num - 1) elements
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* at most. Shouldn't modify the sbuf->head.
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*
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* return:
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* ele_size: write succeeded.
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* 0: no write, buf is full
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* negative: failed.
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*/
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uint32_t sbuf_put(struct shared_buf *sbuf, uint8_t *data)
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{
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void *to;
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uint32_t next_tail;
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uint32_t ele_size;
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bool trigger_overwrite = false;
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stac();
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next_tail = sbuf_next_ptr(sbuf->tail, sbuf->ele_size, sbuf->size);
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if ((next_tail == sbuf->head) && ((sbuf->flags & OVERWRITE_EN) == 0U)) {
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/* if overrun is not enabled, return 0 directly */
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ele_size = 0U;
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} else {
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if (next_tail == sbuf->head) {
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/* accumulate overrun count if necessary */
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sbuf->overrun_cnt += sbuf->flags & OVERRUN_CNT_EN;
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trigger_overwrite = true;
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}
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to = (void *)sbuf + SBUF_HEAD_SIZE + sbuf->tail;
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(void)memcpy_s(to, sbuf->ele_size, data, sbuf->ele_size);
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/* make sure write data before update head */
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cpu_write_memory_barrier();
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if (trigger_overwrite) {
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sbuf->head = sbuf_next_ptr(sbuf->head,
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sbuf->ele_size, sbuf->size);
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}
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sbuf->tail = next_tail;
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ele_size = sbuf->ele_size;
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}
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clac();
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return ele_size;
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}
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int32_t sbuf_setup_common(struct acrn_vm *vm, uint16_t cpu_id, uint32_t sbuf_id, uint64_t *hva)
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{
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int32_t ret = 0;
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switch (sbuf_id) {
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case ACRN_TRACE:
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case ACRN_HVLOG:
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case ACRN_SEP:
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case ACRN_SOCWATCH:
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ret = sbuf_share_setup(cpu_id, sbuf_id, hva);
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break;
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case ACRN_ASYNCIO:
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ret = init_asyncio(vm, hva);
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break;
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default:
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pr_err("%s not support sbuf_id %d", __func__, sbuf_id);
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ret = -1;
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}
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return ret;
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}
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