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https://github.com/projectacrn/acrn-hypervisor.git
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4d88b2bb65
The sbuf is allocated for each pcpu by hypercall from SOS. Before launch Guest OS, the script will offline cpus, which will trigger vcpu reset and then reset sbuf pointer. But sbuf only initiate once by SOS, so these cpus for Guest OS has no sbuf to use. Thus, when run 'acrntrace' on SOS, there is no trace data for Guest OS. To fix the issue, only reset the sbuf for SOS. Tracked-On: #3335 Signed-off-by: Conghui Chen <conghui.chen@intel.com> Reviewed-by: Eddie Dong <eddie.dong@intel.com> Reviewed-by: Yan, Like <like.yan@intel.com>
105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
/*
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* SHARED BUFFER
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*
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* Copyright (C) 2017 Intel Corporation. All rights reserved.
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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 <cpu.h>
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#include <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 this write would trigger overrun */
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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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if ((sbuf->flags & OVERWRITE_EN) == 0U) {
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/* if not enable over write, return here. */
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clac();
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return 0;
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}
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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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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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clac();
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return ele_size;
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}
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int32_t sbuf_share_setup(uint16_t pcpu_id, uint32_t sbuf_id, uint64_t *hva)
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{
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if ((pcpu_id >= get_pcpu_nums()) || (sbuf_id >= ACRN_SBUF_ID_MAX)) {
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return -EINVAL;
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}
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per_cpu(sbuf, pcpu_id)[sbuf_id] = hva;
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pr_info("%s share sbuf for pCPU[%u] with sbuf_id[%u] setup successfully",
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__func__, pcpu_id, sbuf_id);
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return 0;
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}
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void sbuf_reset(void)
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{
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uint16_t pcpu_id, sbuf_id;
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for (pcpu_id = 0U; pcpu_id < get_pcpu_nums(); pcpu_id++) {
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for (sbuf_id = 0U; sbuf_id < ACRN_SBUF_ID_MAX; sbuf_id++) {
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per_cpu(sbuf, pcpu_id)[sbuf_id] = 0U;
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}
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}
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}
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