f5d4c81937
According to virtio spec, the device MUST reset when 0 is written to device_status, and present 0 in device_status once reset is done. This patch waits status value to be 0 during reset operation, if timeout in 3 seconds, log and continue. Signed-off-by: Xueming Li <xuemingl@nvidia.com> Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru> Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2010-2014 Intel Corporation
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* Copyright(c) 2020 Red Hat, Inc.
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*/
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#include <unistd.h>
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#include "virtio.h"
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#include "virtio_logs.h"
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uint64_t
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virtio_negotiate_features(struct virtio_hw *hw, uint64_t host_features)
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{
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uint64_t features;
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/*
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* Limit negotiated features to what the driver, virtqueue, and
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* host all support.
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*/
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features = host_features & hw->guest_features;
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VIRTIO_OPS(hw)->set_features(hw, features);
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return features;
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}
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void
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virtio_read_dev_config(struct virtio_hw *hw, size_t offset,
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void *dst, int length)
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{
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VIRTIO_OPS(hw)->read_dev_cfg(hw, offset, dst, length);
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}
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void
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virtio_write_dev_config(struct virtio_hw *hw, size_t offset,
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const void *src, int length)
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{
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VIRTIO_OPS(hw)->write_dev_cfg(hw, offset, src, length);
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}
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void
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virtio_reset(struct virtio_hw *hw)
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{
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uint32_t retry = 0;
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VIRTIO_OPS(hw)->set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
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/* Flush status write and wait device ready max 3 seconds. */
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while (VIRTIO_OPS(hw)->get_status(hw) != VIRTIO_CONFIG_STATUS_RESET) {
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if (retry++ > 3000) {
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PMD_INIT_LOG(WARNING, "port %u device reset timeout", hw->port_id);
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break;
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}
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usleep(1000L);
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}
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}
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void
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virtio_reinit_complete(struct virtio_hw *hw)
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{
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virtio_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK);
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}
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void
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virtio_set_status(struct virtio_hw *hw, uint8_t status)
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{
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if (status != VIRTIO_CONFIG_STATUS_RESET)
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status |= VIRTIO_OPS(hw)->get_status(hw);
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VIRTIO_OPS(hw)->set_status(hw, status);
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}
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uint8_t
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virtio_get_status(struct virtio_hw *hw)
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{
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return VIRTIO_OPS(hw)->get_status(hw);
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}
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uint8_t
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virtio_get_isr(struct virtio_hw *hw)
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{
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return VIRTIO_OPS(hw)->get_isr(hw);
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}
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