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linux-zen-desktop/drivers/vfio/pci/mlx5/cmd.c

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Initial commit
2023-08-30 17:31:07 +02:00
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved
*/
#include "cmd.h"
enum { CQ_OK = 0, CQ_EMPTY = -1, CQ_POLL_ERR = -2 };
static int mlx5vf_is_migratable(struct mlx5_core_dev *mdev, u16 func_id)
{
int query_sz = MLX5_ST_SZ_BYTES(query_hca_cap_out);
void *query_cap = NULL, *cap;
int ret;
query_cap = kzalloc(query_sz, GFP_KERNEL);
if (!query_cap)
return -ENOMEM;
ret = mlx5_vport_get_other_func_cap(mdev, func_id, query_cap,
MLX5_CAP_GENERAL_2);
if (ret)
goto out;
cap = MLX5_ADDR_OF(query_hca_cap_out, query_cap, capability);
if (!MLX5_GET(cmd_hca_cap_2, cap, migratable))
ret = -EOPNOTSUPP;
out:
kfree(query_cap);
return ret;
}
static int mlx5vf_cmd_get_vhca_id(struct mlx5_core_dev *mdev, u16 function_id,
u16 *vhca_id);
static void
_mlx5vf_free_page_tracker_resources(struct mlx5vf_pci_core_device *mvdev);
int mlx5vf_cmd_suspend_vhca(struct mlx5vf_pci_core_device *mvdev, u16 op_mod)
{
struct mlx5_vf_migration_file *migf = mvdev->saving_migf;
u32 out[MLX5_ST_SZ_DW(suspend_vhca_out)] = {};
u32 in[MLX5_ST_SZ_DW(suspend_vhca_in)] = {};
int err;
lockdep_assert_held(&mvdev->state_mutex);
if (mvdev->mdev_detach)
return -ENOTCONN;
/*
* In case PRE_COPY is used, saving_migf is exposed while the device is
* running. Make sure to run only once there is no active save command.
* Running both in parallel, might end-up with a failure in the save
* command once it will try to turn on 'tracking' on a suspended device.
*/
if (migf) {
err = wait_for_completion_interruptible(&migf->save_comp);
if (err)
return err;
}
MLX5_SET(suspend_vhca_in, in, opcode, MLX5_CMD_OP_SUSPEND_VHCA);
MLX5_SET(suspend_vhca_in, in, vhca_id, mvdev->vhca_id);
MLX5_SET(suspend_vhca_in, in, op_mod, op_mod);
err = mlx5_cmd_exec_inout(mvdev->mdev, suspend_vhca, in, out);
if (migf)
complete(&migf->save_comp);
return err;
}
int mlx5vf_cmd_resume_vhca(struct mlx5vf_pci_core_device *mvdev, u16 op_mod)
{
u32 out[MLX5_ST_SZ_DW(resume_vhca_out)] = {};
u32 in[MLX5_ST_SZ_DW(resume_vhca_in)] = {};
lockdep_assert_held(&mvdev->state_mutex);
if (mvdev->mdev_detach)
return -ENOTCONN;
MLX5_SET(resume_vhca_in, in, opcode, MLX5_CMD_OP_RESUME_VHCA);
MLX5_SET(resume_vhca_in, in, vhca_id, mvdev->vhca_id);
MLX5_SET(resume_vhca_in, in, op_mod, op_mod);
return mlx5_cmd_exec_inout(mvdev->mdev, resume_vhca, in, out);
}
int mlx5vf_cmd_query_vhca_migration_state(struct mlx5vf_pci_core_device *mvdev,
size_t *state_size, u8 query_flags)
{
u32 out[MLX5_ST_SZ_DW(query_vhca_migration_state_out)] = {};
u32 in[MLX5_ST_SZ_DW(query_vhca_migration_state_in)] = {};
bool inc = query_flags & MLX5VF_QUERY_INC;
int ret;
lockdep_assert_held(&mvdev->state_mutex);
if (mvdev->mdev_detach)
return -ENOTCONN;
/*
* In case PRE_COPY is used, saving_migf is exposed while device is
* running. Make sure to run only once there is no active save command.
* Running both in parallel, might end-up with a failure in the
* incremental query command on un-tracked vhca.
*/
if (inc) {
ret = wait_for_completion_interruptible(&mvdev->saving_migf->save_comp);
if (ret)
return ret;
if (mvdev->saving_migf->state ==
MLX5_MIGF_STATE_PRE_COPY_ERROR) {
/*
* In case we had a PRE_COPY error, only query full
* image for final image
*/
if (!(query_flags & MLX5VF_QUERY_FINAL)) {
*state_size = 0;
complete(&mvdev->saving_migf->save_comp);
return 0;
}
query_flags &= ~MLX5VF_QUERY_INC;
}
}
MLX5_SET(query_vhca_migration_state_in, in, opcode,
MLX5_CMD_OP_QUERY_VHCA_MIGRATION_STATE);
MLX5_SET(query_vhca_migration_state_in, in, vhca_id, mvdev->vhca_id);
MLX5_SET(query_vhca_migration_state_in, in, op_mod, 0);
MLX5_SET(query_vhca_migration_state_in, in, incremental,
query_flags & MLX5VF_QUERY_INC);
ret = mlx5_cmd_exec_inout(mvdev->mdev, query_vhca_migration_state, in,
out);
if (inc)
complete(&mvdev->saving_migf->save_comp);
if (ret)
return ret;
*state_size = MLX5_GET(query_vhca_migration_state_out, out,
required_umem_size);
return 0;
}
static void set_tracker_error(struct mlx5vf_pci_core_device *mvdev)
{
/* Mark the tracker under an error and wake it up if it's running */
mvdev->tracker.is_err = true;
complete(&mvdev->tracker_comp);
}
static int mlx5fv_vf_event(struct notifier_block *nb,
unsigned long event, void *data)
{
struct mlx5vf_pci_core_device *mvdev =
container_of(nb, struct mlx5vf_pci_core_device, nb);
switch (event) {
case MLX5_PF_NOTIFY_ENABLE_VF:
mutex_lock(&mvdev->state_mutex);
mvdev->mdev_detach = false;
mlx5vf_state_mutex_unlock(mvdev);
break;
case MLX5_PF_NOTIFY_DISABLE_VF:
mlx5vf_cmd_close_migratable(mvdev);
mutex_lock(&mvdev->state_mutex);
mvdev->mdev_detach = true;
mlx5vf_state_mutex_unlock(mvdev);
break;
default:
break;
}
return 0;
}
void mlx5vf_cmd_close_migratable(struct mlx5vf_pci_core_device *mvdev)
{
if (!mvdev->migrate_cap)
return;
/* Must be done outside the lock to let it progress */
set_tracker_error(mvdev);
mutex_lock(&mvdev->state_mutex);
mlx5vf_disable_fds(mvdev);
_mlx5vf_free_page_tracker_resources(mvdev);
mlx5vf_state_mutex_unlock(mvdev);
}
void mlx5vf_cmd_remove_migratable(struct mlx5vf_pci_core_device *mvdev)
{
if (!mvdev->migrate_cap)
return;
mlx5_sriov_blocking_notifier_unregister(mvdev->mdev, mvdev->vf_id,
&mvdev->nb);
destroy_workqueue(mvdev->cb_wq);
}
void mlx5vf_cmd_set_migratable(struct mlx5vf_pci_core_device *mvdev,
const struct vfio_migration_ops *mig_ops,
const struct vfio_log_ops *log_ops)
{
struct pci_dev *pdev = mvdev->core_device.pdev;
int ret;
if (!pdev->is_virtfn)
return;
mvdev->mdev = mlx5_vf_get_core_dev(pdev);
if (!mvdev->mdev)
return;
if (!MLX5_CAP_GEN(mvdev->mdev, migration))
goto end;
mvdev->vf_id = pci_iov_vf_id(pdev);
if (mvdev->vf_id < 0)
goto end;
ret = mlx5vf_is_migratable(mvdev->mdev, mvdev->vf_id + 1);
if (ret)
goto end;
if (mlx5vf_cmd_get_vhca_id(mvdev->mdev, mvdev->vf_id + 1,
&mvdev->vhca_id))
goto end;
mvdev->cb_wq = alloc_ordered_workqueue("mlx5vf_wq", 0);
if (!mvdev->cb_wq)
goto end;
mutex_init(&mvdev->state_mutex);
spin_lock_init(&mvdev->reset_lock);
mvdev->nb.notifier_call = mlx5fv_vf_event;
ret = mlx5_sriov_blocking_notifier_register(mvdev->mdev, mvdev->vf_id,
&mvdev->nb);
if (ret) {
destroy_workqueue(mvdev->cb_wq);
goto end;
}
mvdev->migrate_cap = 1;
mvdev->core_device.vdev.migration_flags =
VFIO_MIGRATION_STOP_COPY |
VFIO_MIGRATION_P2P;
mvdev->core_device.vdev.mig_ops = mig_ops;
init_completion(&mvdev->tracker_comp);
if (MLX5_CAP_GEN(mvdev->mdev, adv_virtualization))
mvdev->core_device.vdev.log_ops = log_ops;
if (MLX5_CAP_GEN_2(mvdev->mdev, migration_multi_load) &&
MLX5_CAP_GEN_2(mvdev->mdev, migration_tracking_state))
mvdev->core_device.vdev.migration_flags |=
VFIO_MIGRATION_PRE_COPY;
end:
mlx5_vf_put_core_dev(mvdev->mdev);
}
static int mlx5vf_cmd_get_vhca_id(struct mlx5_core_dev *mdev, u16 function_id,
u16 *vhca_id)
{
u32 in[MLX5_ST_SZ_DW(query_hca_cap_in)] = {};
int out_size;
void *out;
int ret;
out_size = MLX5_ST_SZ_BYTES(query_hca_cap_out);
out = kzalloc(out_size, GFP_KERNEL);
if (!out)
return -ENOMEM;
MLX5_SET(query_hca_cap_in, in, opcode, MLX5_CMD_OP_QUERY_HCA_CAP);
MLX5_SET(query_hca_cap_in, in, other_function, 1);
MLX5_SET(query_hca_cap_in, in, function_id, function_id);
MLX5_SET(query_hca_cap_in, in, op_mod,
MLX5_SET_HCA_CAP_OP_MOD_GENERAL_DEVICE << 1 |
HCA_CAP_OPMOD_GET_CUR);
ret = mlx5_cmd_exec_inout(mdev, query_hca_cap, in, out);
if (ret)
goto err_exec;
*vhca_id = MLX5_GET(query_hca_cap_out, out,
capability.cmd_hca_cap.vhca_id);
err_exec:
kfree(out);
return ret;
}
static int _create_mkey(struct mlx5_core_dev *mdev, u32 pdn,
struct mlx5_vhca_data_buffer *buf,
struct mlx5_vhca_recv_buf *recv_buf,
u32 *mkey)
{
size_t npages = buf ? DIV_ROUND_UP(buf->allocated_length, PAGE_SIZE) :
recv_buf->npages;
int err = 0, inlen;
__be64 *mtt;
void *mkc;
u32 *in;
inlen = MLX5_ST_SZ_BYTES(create_mkey_in) +
sizeof(*mtt) * round_up(npages, 2);
in = kvzalloc(inlen, GFP_KERNEL);
if (!in)
return -ENOMEM;
MLX5_SET(create_mkey_in, in, translations_octword_actual_size,
DIV_ROUND_UP(npages, 2));
mtt = (__be64 *)MLX5_ADDR_OF(create_mkey_in, in, klm_pas_mtt);
if (buf) {
struct sg_dma_page_iter dma_iter;
for_each_sgtable_dma_page(&buf->table.sgt, &dma_iter, 0)
*mtt++ = cpu_to_be64(sg_page_iter_dma_address(&dma_iter));
} else {
int i;
for (i = 0; i < npages; i++)
*mtt++ = cpu_to_be64(recv_buf->dma_addrs[i]);
}
mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
MLX5_SET(mkc, mkc, access_mode_1_0, MLX5_MKC_ACCESS_MODE_MTT);
MLX5_SET(mkc, mkc, lr, 1);
MLX5_SET(mkc, mkc, lw, 1);
MLX5_SET(mkc, mkc, rr, 1);
MLX5_SET(mkc, mkc, rw, 1);
MLX5_SET(mkc, mkc, pd, pdn);
MLX5_SET(mkc, mkc, bsf_octword_size, 0);
MLX5_SET(mkc, mkc, qpn, 0xffffff);
MLX5_SET(mkc, mkc, log_page_size, PAGE_SHIFT);
MLX5_SET(mkc, mkc, translations_octword_size, DIV_ROUND_UP(npages, 2));
MLX5_SET64(mkc, mkc, len, npages * PAGE_SIZE);
err = mlx5_core_create_mkey(mdev, mkey, in, inlen);
kvfree(in);
return err;
}
static int mlx5vf_dma_data_buffer(struct mlx5_vhca_data_buffer *buf)
{
struct mlx5vf_pci_core_device *mvdev = buf->migf->mvdev;
struct mlx5_core_dev *mdev = mvdev->mdev;
int ret;
lockdep_assert_held(&mvdev->state_mutex);
if (mvdev->mdev_detach)
return -ENOTCONN;
if (buf->dmaed || !buf->allocated_length)
return -EINVAL;
ret = dma_map_sgtable(mdev->device, &buf->table.sgt, buf->dma_dir, 0);
if (ret)
return ret;
ret = _create_mkey(mdev, buf->migf->pdn, buf, NULL, &buf->mkey);
if (ret)
goto err;
buf->dmaed = true;
return 0;
err:
dma_unmap_sgtable(mdev->device, &buf->table.sgt, buf->dma_dir, 0);
return ret;
}
void mlx5vf_free_data_buffer(struct mlx5_vhca_data_buffer *buf)
{
struct mlx5_vf_migration_file *migf = buf->migf;
struct sg_page_iter sg_iter;
lockdep_assert_held(&migf->mvdev->state_mutex);
WARN_ON(migf->mvdev->mdev_detach);
if (buf->dmaed) {
mlx5_core_destroy_mkey(migf->mvdev->mdev, buf->mkey);
dma_unmap_sgtable(migf->mvdev->mdev->device, &buf->table.sgt,
buf->dma_dir, 0);
}
/* Undo alloc_pages_bulk_array() */
for_each_sgtable_page(&buf->table.sgt, &sg_iter, 0)
__free_page(sg_page_iter_page(&sg_iter));
sg_free_append_table(&buf->table);
kfree(buf);
}
struct mlx5_vhca_data_buffer *
mlx5vf_alloc_data_buffer(struct mlx5_vf_migration_file *migf,
size_t length,
enum dma_data_direction dma_dir)
{
struct mlx5_vhca_data_buffer *buf;
int ret;
buf = kzalloc(sizeof(*buf), GFP_KERNEL_ACCOUNT);
if (!buf)
return ERR_PTR(-ENOMEM);
buf->dma_dir = dma_dir;
buf->migf = migf;
if (length) {
ret = mlx5vf_add_migration_pages(buf,
DIV_ROUND_UP_ULL(length, PAGE_SIZE));
if (ret)
goto end;
if (dma_dir != DMA_NONE) {
ret = mlx5vf_dma_data_buffer(buf);
if (ret)
goto end;
}
}
return buf;
end:
mlx5vf_free_data_buffer(buf);
return ERR_PTR(ret);
}
void mlx5vf_put_data_buffer(struct mlx5_vhca_data_buffer *buf)
{
spin_lock_irq(&buf->migf->list_lock);
list_add_tail(&buf->buf_elm, &buf->migf->avail_list);
spin_unlock_irq(&buf->migf->list_lock);
}
struct mlx5_vhca_data_buffer *
mlx5vf_get_data_buffer(struct mlx5_vf_migration_file *migf,
size_t length, enum dma_data_direction dma_dir)
{
struct mlx5_vhca_data_buffer *buf, *temp_buf;
struct list_head free_list;
lockdep_assert_held(&migf->mvdev->state_mutex);
if (migf->mvdev->mdev_detach)
return ERR_PTR(-ENOTCONN);
INIT_LIST_HEAD(&free_list);
spin_lock_irq(&migf->list_lock);
list_for_each_entry_safe(buf, temp_buf, &migf->avail_list, buf_elm) {
if (buf->dma_dir == dma_dir) {
list_del_init(&buf->buf_elm);
if (buf->allocated_length >= length) {
spin_unlock_irq(&migf->list_lock);
goto found;
}
/*
* Prevent holding redundant buffers. Put in a free
* list and call at the end not under the spin lock
* (&migf->list_lock) to mlx5vf_free_data_buffer which
* might sleep.
*/
list_add(&buf->buf_elm, &free_list);
}
}
spin_unlock_irq(&migf->list_lock);
buf = mlx5vf_alloc_data_buffer(migf, length, dma_dir);
found:
while ((temp_buf = list_first_entry_or_null(&free_list,
struct mlx5_vhca_data_buffer, buf_elm))) {
list_del(&temp_buf->buf_elm);
mlx5vf_free_data_buffer(temp_buf);
}
return buf;
}
void mlx5vf_mig_file_cleanup_cb(struct work_struct *_work)
{
struct mlx5vf_async_data *async_data = container_of(_work,
struct mlx5vf_async_data, work);
struct mlx5_vf_migration_file *migf = container_of(async_data,
struct mlx5_vf_migration_file, async_data);
mutex_lock(&migf->lock);
if (async_data->status) {
mlx5vf_put_data_buffer(async_data->buf);
if (async_data->header_buf)
mlx5vf_put_data_buffer(async_data->header_buf);
if (async_data->status == MLX5_CMD_STAT_BAD_RES_STATE_ERR)
migf->state = MLX5_MIGF_STATE_PRE_COPY_ERROR;
else
migf->state = MLX5_MIGF_STATE_ERROR;
wake_up_interruptible(&migf->poll_wait);
}
mutex_unlock(&migf->lock);
kvfree(async_data->out);
complete(&migf->save_comp);
fput(migf->filp);
}
static int add_buf_header(struct mlx5_vhca_data_buffer *header_buf,
size_t image_size, bool initial_pre_copy)
{
struct mlx5_vf_migration_file *migf = header_buf->migf;
struct mlx5_vf_migration_header header = {};
unsigned long flags;
struct page *page;
u8 *to_buff;
header.record_size = cpu_to_le64(image_size);
header.flags = cpu_to_le32(MLX5_MIGF_HEADER_FLAGS_TAG_MANDATORY);
header.tag = cpu_to_le32(MLX5_MIGF_HEADER_TAG_FW_DATA);
page = mlx5vf_get_migration_page(header_buf, 0);
if (!page)
return -EINVAL;
to_buff = kmap_local_page(page);
memcpy(to_buff, &header, sizeof(header));
kunmap_local(to_buff);
header_buf->length = sizeof(header);
header_buf->start_pos = header_buf->migf->max_pos;
migf->max_pos += header_buf->length;
spin_lock_irqsave(&migf->list_lock, flags);
list_add_tail(&header_buf->buf_elm, &migf->buf_list);
spin_unlock_irqrestore(&migf->list_lock, flags);
if (initial_pre_copy)
migf->pre_copy_initial_bytes += sizeof(header);
return 0;
}
static void mlx5vf_save_callback(int status, struct mlx5_async_work *context)
{
struct mlx5vf_async_data *async_data = container_of(context,
struct mlx5vf_async_data, cb_work);
struct mlx5_vf_migration_file *migf = container_of(async_data,
struct mlx5_vf_migration_file, async_data);
if (!status) {
size_t image_size;
unsigned long flags;
bool initial_pre_copy = migf->state != MLX5_MIGF_STATE_PRE_COPY &&
!async_data->last_chunk;
image_size = MLX5_GET(save_vhca_state_out, async_data->out,
actual_image_size);
if (async_data->header_buf) {
status = add_buf_header(async_data->header_buf, image_size,
initial_pre_copy);
if (status)
goto err;
}
async_data->buf->length = image_size;
async_data->buf->start_pos = migf->max_pos;
migf->max_pos += async_data->buf->length;
spin_lock_irqsave(&migf->list_lock, flags);
list_add_tail(&async_data->buf->buf_elm, &migf->buf_list);
spin_unlock_irqrestore(&migf->list_lock, flags);
if (initial_pre_copy)
migf->pre_copy_initial_bytes += image_size;
migf->state = async_data->last_chunk ?
MLX5_MIGF_STATE_COMPLETE : MLX5_MIGF_STATE_PRE_COPY;
wake_up_interruptible(&migf->poll_wait);
}
err:
/*
* The error and the cleanup flows can't run from an
* interrupt context
*/
if (status == -EREMOTEIO)
status = MLX5_GET(save_vhca_state_out, async_data->out, status);
async_data->status = status;
queue_work(migf->mvdev->cb_wq, &async_data->work);
}
int mlx5vf_cmd_save_vhca_state(struct mlx5vf_pci_core_device *mvdev,
struct mlx5_vf_migration_file *migf,
struct mlx5_vhca_data_buffer *buf, bool inc,
bool track)
{
u32 out_size = MLX5_ST_SZ_BYTES(save_vhca_state_out);
u32 in[MLX5_ST_SZ_DW(save_vhca_state_in)] = {};
struct mlx5_vhca_data_buffer *header_buf = NULL;
struct mlx5vf_async_data *async_data;
int err;
lockdep_assert_held(&mvdev->state_mutex);
if (mvdev->mdev_detach)
return -ENOTCONN;
err = wait_for_completion_interruptible(&migf->save_comp);
if (err)
return err;
if (migf->state == MLX5_MIGF_STATE_PRE_COPY_ERROR)
/*
* In case we had a PRE_COPY error, SAVE is triggered only for
* the final image, read device full image.
*/
inc = false;
MLX5_SET(save_vhca_state_in, in, opcode,
MLX5_CMD_OP_SAVE_VHCA_STATE);
MLX5_SET(save_vhca_state_in, in, op_mod, 0);
MLX5_SET(save_vhca_state_in, in, vhca_id, mvdev->vhca_id);
MLX5_SET(save_vhca_state_in, in, mkey, buf->mkey);
MLX5_SET(save_vhca_state_in, in, size, buf->allocated_length);
MLX5_SET(save_vhca_state_in, in, incremental, inc);
MLX5_SET(save_vhca_state_in, in, set_track, track);
async_data = &migf->async_data;
async_data->buf = buf;
async_data->last_chunk = !track;
async_data->out = kvzalloc(out_size, GFP_KERNEL);
if (!async_data->out) {
err = -ENOMEM;
goto err_out;
}
if (MLX5VF_PRE_COPY_SUPP(mvdev)) {
if (async_data->last_chunk && migf->buf_header) {
header_buf = migf->buf_header;
migf->buf_header = NULL;
} else {
header_buf = mlx5vf_get_data_buffer(migf,
sizeof(struct mlx5_vf_migration_header), DMA_NONE);
if (IS_ERR(header_buf)) {
err = PTR_ERR(header_buf);
goto err_free;
}
}
}
if (async_data->last_chunk)
migf->state = MLX5_MIGF_STATE_SAVE_LAST;
async_data->header_buf = header_buf;
get_file(migf->filp);
err = mlx5_cmd_exec_cb(&migf->async_ctx, in, sizeof(in),
async_data->out,
out_size, mlx5vf_save_callback,
&async_data->cb_work);
if (err)
goto err_exec;
return 0;
err_exec:
if (header_buf)
mlx5vf_put_data_buffer(header_buf);
fput(migf->filp);
err_free:
kvfree(async_data->out);
err_out:
complete(&migf->save_comp);
return err;
}
int mlx5vf_cmd_load_vhca_state(struct mlx5vf_pci_core_device *mvdev,
struct mlx5_vf_migration_file *migf,
struct mlx5_vhca_data_buffer *buf)
{
u32 out[MLX5_ST_SZ_DW(load_vhca_state_out)] = {};
u32 in[MLX5_ST_SZ_DW(load_vhca_state_in)] = {};
int err;
lockdep_assert_held(&mvdev->state_mutex);
if (mvdev->mdev_detach)
return -ENOTCONN;
if (!buf->dmaed) {
err = mlx5vf_dma_data_buffer(buf);
if (err)
return err;
}
MLX5_SET(load_vhca_state_in, in, opcode,
MLX5_CMD_OP_LOAD_VHCA_STATE);
MLX5_SET(load_vhca_state_in, in, op_mod, 0);
MLX5_SET(load_vhca_state_in, in, vhca_id, mvdev->vhca_id);
MLX5_SET(load_vhca_state_in, in, mkey, buf->mkey);
MLX5_SET(load_vhca_state_in, in, size, buf->length);
return mlx5_cmd_exec_inout(mvdev->mdev, load_vhca_state, in, out);
}
int mlx5vf_cmd_alloc_pd(struct mlx5_vf_migration_file *migf)
{
int err;
lockdep_assert_held(&migf->mvdev->state_mutex);
if (migf->mvdev->mdev_detach)
return -ENOTCONN;
err = mlx5_core_alloc_pd(migf->mvdev->mdev, &migf->pdn);
return err;
}
void mlx5vf_cmd_dealloc_pd(struct mlx5_vf_migration_file *migf)
{
lockdep_assert_held(&migf->mvdev->state_mutex);
if (migf->mvdev->mdev_detach)
return;
mlx5_core_dealloc_pd(migf->mvdev->mdev, migf->pdn);
}
void mlx5fv_cmd_clean_migf_resources(struct mlx5_vf_migration_file *migf)
{
struct mlx5_vhca_data_buffer *entry;
lockdep_assert_held(&migf->mvdev->state_mutex);
WARN_ON(migf->mvdev->mdev_detach);
if (migf->buf) {
mlx5vf_free_data_buffer(migf->buf);
migf->buf = NULL;
}
if (migf->buf_header) {
mlx5vf_free_data_buffer(migf->buf_header);
migf->buf_header = NULL;
}
list_splice(&migf->avail_list, &migf->buf_list);
while ((entry = list_first_entry_or_null(&migf->buf_list,
struct mlx5_vhca_data_buffer, buf_elm))) {
list_del(&entry->buf_elm);
mlx5vf_free_data_buffer(entry);
}
mlx5vf_cmd_dealloc_pd(migf);
}
static void combine_ranges(struct rb_root_cached *root, u32 cur_nodes,
u32 req_nodes)
{
struct interval_tree_node *prev, *curr, *comb_start, *comb_end;
unsigned long min_gap;
unsigned long curr_gap;
/* Special shortcut when a single range is required */
if (req_nodes == 1) {
unsigned long last;
curr = comb_start = interval_tree_iter_first(root, 0, ULONG_MAX);
while (curr) {
last = curr->last;
prev = curr;
curr = interval_tree_iter_next(curr, 0, ULONG_MAX);
if (prev != comb_start)
interval_tree_remove(prev, root);
}
comb_start->last = last;
return;
}
/* Combine ranges which have the smallest gap */
while (cur_nodes > req_nodes) {
prev = NULL;
min_gap = ULONG_MAX;
curr = interval_tree_iter_first(root, 0, ULONG_MAX);
while (curr) {
if (prev) {
curr_gap = curr->start - prev->last;
if (curr_gap < min_gap) {
min_gap = curr_gap;
comb_start = prev;
comb_end = curr;
}
}
prev = curr;
curr = interval_tree_iter_next(curr, 0, ULONG_MAX);
}
comb_start->last = comb_end->last;
interval_tree_remove(comb_end, root);
cur_nodes--;
}
}
static int mlx5vf_create_tracker(struct mlx5_core_dev *mdev,
struct mlx5vf_pci_core_device *mvdev,
struct rb_root_cached *ranges, u32 nnodes)
{
int max_num_range =
MLX5_CAP_ADV_VIRTUALIZATION(mdev, pg_track_max_num_range);
struct mlx5_vhca_page_tracker *tracker = &mvdev->tracker;
int record_size = MLX5_ST_SZ_BYTES(page_track_range);
u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)] = {};
struct interval_tree_node *node = NULL;
u64 total_ranges_len = 0;
u32 num_ranges = nnodes;
u8 log_addr_space_size;
void *range_list_ptr;
void *obj_context;
void *cmd_hdr;
int inlen;
void *in;
int err;
int i;
if (num_ranges > max_num_range) {
combine_ranges(ranges, nnodes, max_num_range);
num_ranges = max_num_range;
}
inlen = MLX5_ST_SZ_BYTES(create_page_track_obj_in) +
record_size * num_ranges;
in = kzalloc(inlen, GFP_KERNEL);
if (!in)
return -ENOMEM;
cmd_hdr = MLX5_ADDR_OF(create_page_track_obj_in, in,
general_obj_in_cmd_hdr);
MLX5_SET(general_obj_in_cmd_hdr, cmd_hdr, opcode,
MLX5_CMD_OP_CREATE_GENERAL_OBJECT);
MLX5_SET(general_obj_in_cmd_hdr, cmd_hdr, obj_type,
MLX5_OBJ_TYPE_PAGE_TRACK);
obj_context = MLX5_ADDR_OF(create_page_track_obj_in, in, obj_context);
MLX5_SET(page_track, obj_context, vhca_id, mvdev->vhca_id);
MLX5_SET(page_track, obj_context, track_type, 1);
MLX5_SET(page_track, obj_context, log_page_size,
ilog2(tracker->host_qp->tracked_page_size));
MLX5_SET(page_track, obj_context, log_msg_size,
ilog2(tracker->host_qp->max_msg_size));
MLX5_SET(page_track, obj_context, reporting_qpn, tracker->fw_qp->qpn);
MLX5_SET(page_track, obj_context, num_ranges, num_ranges);
range_list_ptr = MLX5_ADDR_OF(page_track, obj_context, track_range);
node = interval_tree_iter_first(ranges, 0, ULONG_MAX);
for (i = 0; i < num_ranges; i++) {
void *addr_range_i_base = range_list_ptr + record_size * i;
unsigned long length = node->last - node->start + 1;
MLX5_SET64(page_track_range, addr_range_i_base, start_address,
node->start);
MLX5_SET64(page_track_range, addr_range_i_base, length, length);
total_ranges_len += length;
node = interval_tree_iter_next(node, 0, ULONG_MAX);
}
WARN_ON(node);
log_addr_space_size = ilog2(roundup_pow_of_two(total_ranges_len));
if (log_addr_space_size <
(MLX5_CAP_ADV_VIRTUALIZATION(mdev, pg_track_log_min_addr_space)) ||
log_addr_space_size >
(MLX5_CAP_ADV_VIRTUALIZATION(mdev, pg_track_log_max_addr_space))) {
err = -EOPNOTSUPP;
goto out;
}
MLX5_SET(page_track, obj_context, log_addr_space_size,
log_addr_space_size);
err = mlx5_cmd_exec(mdev, in, inlen, out, sizeof(out));
if (err)
goto out;
tracker->id = MLX5_GET(general_obj_out_cmd_hdr, out, obj_id);
out:
kfree(in);
return err;
}
static int mlx5vf_cmd_destroy_tracker(struct mlx5_core_dev *mdev,
u32 tracker_id)
{
u32 in[MLX5_ST_SZ_DW(general_obj_in_cmd_hdr)] = {};
u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)] = {};
MLX5_SET(general_obj_in_cmd_hdr, in, opcode, MLX5_CMD_OP_DESTROY_GENERAL_OBJECT);
MLX5_SET(general_obj_in_cmd_hdr, in, obj_type, MLX5_OBJ_TYPE_PAGE_TRACK);
MLX5_SET(general_obj_in_cmd_hdr, in, obj_id, tracker_id);
return mlx5_cmd_exec(mdev, in, sizeof(in), out, sizeof(out));
}
static int mlx5vf_cmd_modify_tracker(struct mlx5_core_dev *mdev,
u32 tracker_id, unsigned long iova,
unsigned long length, u32 tracker_state)
{
u32 in[MLX5_ST_SZ_DW(modify_page_track_obj_in)] = {};
u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)] = {};
void *obj_context;
void *cmd_hdr;
cmd_hdr = MLX5_ADDR_OF(modify_page_track_obj_in, in, general_obj_in_cmd_hdr);
MLX5_SET(general_obj_in_cmd_hdr, cmd_hdr, opcode, MLX5_CMD_OP_MODIFY_GENERAL_OBJECT);
MLX5_SET(general_obj_in_cmd_hdr, cmd_hdr, obj_type, MLX5_OBJ_TYPE_PAGE_TRACK);
MLX5_SET(general_obj_in_cmd_hdr, cmd_hdr, obj_id, tracker_id);
obj_context = MLX5_ADDR_OF(modify_page_track_obj_in, in, obj_context);
MLX5_SET64(page_track, obj_context, modify_field_select, 0x3);
MLX5_SET64(page_track, obj_context, range_start_address, iova);
MLX5_SET64(page_track, obj_context, length, length);
MLX5_SET(page_track, obj_context, state, tracker_state);
return mlx5_cmd_exec(mdev, in, sizeof(in), out, sizeof(out));
}
static int alloc_cq_frag_buf(struct mlx5_core_dev *mdev,
struct mlx5_vhca_cq_buf *buf, int nent,
int cqe_size)
{
struct mlx5_frag_buf *frag_buf = &buf->frag_buf;
u8 log_wq_stride = 6 + (cqe_size == 128 ? 1 : 0);
u8 log_wq_sz = ilog2(cqe_size);
int err;
err = mlx5_frag_buf_alloc_node(mdev, nent * cqe_size, frag_buf,
mdev->priv.numa_node);
if (err)
return err;
mlx5_init_fbc(frag_buf->frags, log_wq_stride, log_wq_sz, &buf->fbc);
buf->cqe_size = cqe_size;
buf->nent = nent;
return 0;
}
static void init_cq_frag_buf(struct mlx5_vhca_cq_buf *buf)
{
struct mlx5_cqe64 *cqe64;
void *cqe;
int i;
for (i = 0; i < buf->nent; i++) {
cqe = mlx5_frag_buf_get_wqe(&buf->fbc, i);
cqe64 = buf->cqe_size == 64 ? cqe : cqe + 64;
cqe64->op_own = MLX5_CQE_INVALID << 4;
}
}
static void mlx5vf_destroy_cq(struct mlx5_core_dev *mdev,
struct mlx5_vhca_cq *cq)
{
mlx5_core_destroy_cq(mdev, &cq->mcq);
mlx5_frag_buf_free(mdev, &cq->buf.frag_buf);
mlx5_db_free(mdev, &cq->db);
}
static void mlx5vf_cq_event(struct mlx5_core_cq *mcq, enum mlx5_event type)
{
if (type != MLX5_EVENT_TYPE_CQ_ERROR)
return;
set_tracker_error(container_of(mcq, struct mlx5vf_pci_core_device,
tracker.cq.mcq));
}
static int mlx5vf_event_notifier(struct notifier_block *nb, unsigned long type,
void *data)
{
struct mlx5_vhca_page_tracker *tracker =
mlx5_nb_cof(nb, struct mlx5_vhca_page_tracker, nb);
struct mlx5vf_pci_core_device *mvdev = container_of(
tracker, struct mlx5vf_pci_core_device, tracker);
struct mlx5_eqe *eqe = data;
u8 event_type = (u8)type;
u8 queue_type;
int qp_num;
switch (event_type) {
case MLX5_EVENT_TYPE_WQ_CATAS_ERROR:
case MLX5_EVENT_TYPE_WQ_ACCESS_ERROR:
case MLX5_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
queue_type = eqe->data.qp_srq.type;
if (queue_type != MLX5_EVENT_QUEUE_TYPE_QP)
break;
qp_num = be32_to_cpu(eqe->data.qp_srq.qp_srq_n) & 0xffffff;
if (qp_num != tracker->host_qp->qpn &&
qp_num != tracker->fw_qp->qpn)
break;
set_tracker_error(mvdev);
break;
default:
break;
}
return NOTIFY_OK;
}
static void mlx5vf_cq_complete(struct mlx5_core_cq *mcq,
struct mlx5_eqe *eqe)
{
struct mlx5vf_pci_core_device *mvdev =
container_of(mcq, struct mlx5vf_pci_core_device,
tracker.cq.mcq);
complete(&mvdev->tracker_comp);
}
static int mlx5vf_create_cq(struct mlx5_core_dev *mdev,
struct mlx5_vhca_page_tracker *tracker,
size_t ncqe)
{
int cqe_size = cache_line_size() == 128 ? 128 : 64;
u32 out[MLX5_ST_SZ_DW(create_cq_out)];
struct mlx5_vhca_cq *cq;
int inlen, err, eqn;
void *cqc, *in;
__be64 *pas;
int vector;
cq = &tracker->cq;
ncqe = roundup_pow_of_two(ncqe);
err = mlx5_db_alloc_node(mdev, &cq->db, mdev->priv.numa_node);
if (err)
return err;
cq->ncqe = ncqe;
cq->mcq.set_ci_db = cq->db.db;
cq->mcq.arm_db = cq->db.db + 1;
cq->mcq.cqe_sz = cqe_size;
err = alloc_cq_frag_buf(mdev, &cq->buf, ncqe, cqe_size);
if (err)
goto err_db_free;
init_cq_frag_buf(&cq->buf);
inlen = MLX5_ST_SZ_BYTES(create_cq_in) +
MLX5_FLD_SZ_BYTES(create_cq_in, pas[0]) *
cq->buf.frag_buf.npages;
in = kvzalloc(inlen, GFP_KERNEL);
if (!in) {
err = -ENOMEM;
goto err_buff;
}
vector = raw_smp_processor_id() % mlx5_comp_vectors_count(mdev);
err = mlx5_vector2eqn(mdev, vector, &eqn);
if (err)
goto err_vec;
cqc = MLX5_ADDR_OF(create_cq_in, in, cq_context);
MLX5_SET(cqc, cqc, log_cq_size, ilog2(ncqe));
MLX5_SET(cqc, cqc, c_eqn_or_apu_element, eqn);
MLX5_SET(cqc, cqc, uar_page, tracker->uar->index);
MLX5_SET(cqc, cqc, log_page_size, cq->buf.frag_buf.page_shift -
MLX5_ADAPTER_PAGE_SHIFT);
MLX5_SET64(cqc, cqc, dbr_addr, cq->db.dma);
pas = (__be64 *)MLX5_ADDR_OF(create_cq_in, in, pas);
mlx5_fill_page_frag_array(&cq->buf.frag_buf, pas);
cq->mcq.comp = mlx5vf_cq_complete;
cq->mcq.event = mlx5vf_cq_event;
err = mlx5_core_create_cq(mdev, &cq->mcq, in, inlen, out, sizeof(out));
if (err)
goto err_vec;
mlx5_cq_arm(&cq->mcq, MLX5_CQ_DB_REQ_NOT, tracker->uar->map,
cq->mcq.cons_index);
kvfree(in);
return 0;
err_vec:
kvfree(in);
err_buff:
mlx5_frag_buf_free(mdev, &cq->buf.frag_buf);
err_db_free:
mlx5_db_free(mdev, &cq->db);
return err;
}
static struct mlx5_vhca_qp *
mlx5vf_create_rc_qp(struct mlx5_core_dev *mdev,
struct mlx5_vhca_page_tracker *tracker, u32 max_recv_wr)
{
u32 out[MLX5_ST_SZ_DW(create_qp_out)] = {};
struct mlx5_vhca_qp *qp;
u8 log_rq_stride;
u8 log_rq_sz;
void *qpc;
int inlen;
void *in;
int err;
qp = kzalloc(sizeof(*qp), GFP_KERNEL_ACCOUNT);
if (!qp)
return ERR_PTR(-ENOMEM);
err = mlx5_db_alloc_node(mdev, &qp->db, mdev->priv.numa_node);
if (err)
goto err_free;
if (max_recv_wr) {
qp->rq.wqe_cnt = roundup_pow_of_two(max_recv_wr);
log_rq_stride = ilog2(MLX5_SEND_WQE_DS);
log_rq_sz = ilog2(qp->rq.wqe_cnt);
err = mlx5_frag_buf_alloc_node(mdev,
wq_get_byte_sz(log_rq_sz, log_rq_stride),
&qp->buf, mdev->priv.numa_node);
if (err)
goto err_db_free;
mlx5_init_fbc(qp->buf.frags, log_rq_stride, log_rq_sz, &qp->rq.fbc);
}
qp->rq.db = &qp->db.db[MLX5_RCV_DBR];
inlen = MLX5_ST_SZ_BYTES(create_qp_in) +
MLX5_FLD_SZ_BYTES(create_qp_in, pas[0]) *
qp->buf.npages;
in = kvzalloc(inlen, GFP_KERNEL);
if (!in) {
err = -ENOMEM;
goto err_in;
}
qpc = MLX5_ADDR_OF(create_qp_in, in, qpc);
MLX5_SET(qpc, qpc, st, MLX5_QP_ST_RC);
MLX5_SET(qpc, qpc, pm_state, MLX5_QP_PM_MIGRATED);
MLX5_SET(qpc, qpc, pd, tracker->pdn);
MLX5_SET(qpc, qpc, uar_page, tracker->uar->index);
MLX5_SET(qpc, qpc, log_page_size,
qp->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT);
MLX5_SET(qpc, qpc, ts_format, mlx5_get_qp_default_ts(mdev));
if (MLX5_CAP_GEN(mdev, cqe_version) == 1)
MLX5_SET(qpc, qpc, user_index, 0xFFFFFF);
MLX5_SET(qpc, qpc, no_sq, 1);
if (max_recv_wr) {
MLX5_SET(qpc, qpc, cqn_rcv, tracker->cq.mcq.cqn);
MLX5_SET(qpc, qpc, log_rq_stride, log_rq_stride - 4);
MLX5_SET(qpc, qpc, log_rq_size, log_rq_sz);
MLX5_SET(qpc, qpc, rq_type, MLX5_NON_ZERO_RQ);
MLX5_SET64(qpc, qpc, dbr_addr, qp->db.dma);
mlx5_fill_page_frag_array(&qp->buf,
(__be64 *)MLX5_ADDR_OF(create_qp_in,
in, pas));
} else {
MLX5_SET(qpc, qpc, rq_type, MLX5_ZERO_LEN_RQ);
}
MLX5_SET(create_qp_in, in, opcode, MLX5_CMD_OP_CREATE_QP);
err = mlx5_cmd_exec(mdev, in, inlen, out, sizeof(out));
kvfree(in);
if (err)
goto err_in;
qp->qpn = MLX5_GET(create_qp_out, out, qpn);
return qp;
err_in:
if (max_recv_wr)
mlx5_frag_buf_free(mdev, &qp->buf);
err_db_free:
mlx5_db_free(mdev, &qp->db);
err_free:
kfree(qp);
return ERR_PTR(err);
}
static void mlx5vf_post_recv(struct mlx5_vhca_qp *qp)
{
struct mlx5_wqe_data_seg *data;
unsigned int ix;
WARN_ON(qp->rq.pc - qp->rq.cc >= qp->rq.wqe_cnt);
ix = qp->rq.pc & (qp->rq.wqe_cnt - 1);
data = mlx5_frag_buf_get_wqe(&qp->rq.fbc, ix);
data->byte_count = cpu_to_be32(qp->max_msg_size);
data->lkey = cpu_to_be32(qp->recv_buf.mkey);
data->addr = cpu_to_be64(qp->recv_buf.next_rq_offset);
qp->rq.pc++;
/* Make sure that descriptors are written before doorbell record. */
dma_wmb();
*qp->rq.db = cpu_to_be32(qp->rq.pc & 0xffff);
}
static int mlx5vf_activate_qp(struct mlx5_core_dev *mdev,
struct mlx5_vhca_qp *qp, u32 remote_qpn,
bool host_qp)
{
u32 init_in[MLX5_ST_SZ_DW(rst2init_qp_in)] = {};
u32 rtr_in[MLX5_ST_SZ_DW(init2rtr_qp_in)] = {};
u32 rts_in[MLX5_ST_SZ_DW(rtr2rts_qp_in)] = {};
void *qpc;
int ret;
/* Init */
qpc = MLX5_ADDR_OF(rst2init_qp_in, init_in, qpc);
MLX5_SET(qpc, qpc, primary_address_path.vhca_port_num, 1);
MLX5_SET(qpc, qpc, pm_state, MLX5_QPC_PM_STATE_MIGRATED);
MLX5_SET(qpc, qpc, rre, 1);
MLX5_SET(qpc, qpc, rwe, 1);
MLX5_SET(rst2init_qp_in, init_in, opcode, MLX5_CMD_OP_RST2INIT_QP);
MLX5_SET(rst2init_qp_in, init_in, qpn, qp->qpn);
ret = mlx5_cmd_exec_in(mdev, rst2init_qp, init_in);
if (ret)
return ret;
if (host_qp) {
struct mlx5_vhca_recv_buf *recv_buf = &qp->recv_buf;
int i;
for (i = 0; i < qp->rq.wqe_cnt; i++) {
mlx5vf_post_recv(qp);
recv_buf->next_rq_offset += qp->max_msg_size;
}
}
/* RTR */
qpc = MLX5_ADDR_OF(init2rtr_qp_in, rtr_in, qpc);
MLX5_SET(init2rtr_qp_in, rtr_in, qpn, qp->qpn);
MLX5_SET(qpc, qpc, mtu, IB_MTU_4096);
MLX5_SET(qpc, qpc, log_msg_max, MLX5_CAP_GEN(mdev, log_max_msg));
MLX5_SET(qpc, qpc, remote_qpn, remote_qpn);
MLX5_SET(qpc, qpc, primary_address_path.vhca_port_num, 1);
MLX5_SET(qpc, qpc, primary_address_path.fl, 1);
MLX5_SET(qpc, qpc, min_rnr_nak, 1);
MLX5_SET(init2rtr_qp_in, rtr_in, opcode, MLX5_CMD_OP_INIT2RTR_QP);
MLX5_SET(init2rtr_qp_in, rtr_in, qpn, qp->qpn);
ret = mlx5_cmd_exec_in(mdev, init2rtr_qp, rtr_in);
if (ret || host_qp)
return ret;
/* RTS */
qpc = MLX5_ADDR_OF(rtr2rts_qp_in, rts_in, qpc);
MLX5_SET(rtr2rts_qp_in, rts_in, qpn, qp->qpn);
MLX5_SET(qpc, qpc, retry_count, 7);
MLX5_SET(qpc, qpc, rnr_retry, 7); /* Infinite retry if RNR NACK */
MLX5_SET(qpc, qpc, primary_address_path.ack_timeout, 0x8); /* ~1ms */
MLX5_SET(rtr2rts_qp_in, rts_in, opcode, MLX5_CMD_OP_RTR2RTS_QP);
MLX5_SET(rtr2rts_qp_in, rts_in, qpn, qp->qpn);
return mlx5_cmd_exec_in(mdev, rtr2rts_qp, rts_in);
}
static void mlx5vf_destroy_qp(struct mlx5_core_dev *mdev,
struct mlx5_vhca_qp *qp)
{
u32 in[MLX5_ST_SZ_DW(destroy_qp_in)] = {};
MLX5_SET(destroy_qp_in, in, opcode, MLX5_CMD_OP_DESTROY_QP);
MLX5_SET(destroy_qp_in, in, qpn, qp->qpn);
mlx5_cmd_exec_in(mdev, destroy_qp, in);
mlx5_frag_buf_free(mdev, &qp->buf);
mlx5_db_free(mdev, &qp->db);
kfree(qp);
}
static void free_recv_pages(struct mlx5_vhca_recv_buf *recv_buf)
{
int i;
/* Undo alloc_pages_bulk_array() */
for (i = 0; i < recv_buf->npages; i++)
__free_page(recv_buf->page_list[i]);
kvfree(recv_buf->page_list);
}
static int alloc_recv_pages(struct mlx5_vhca_recv_buf *recv_buf,
unsigned int npages)
{
unsigned int filled = 0, done = 0;
int i;
recv_buf->page_list = kvcalloc(npages, sizeof(*recv_buf->page_list),
GFP_KERNEL_ACCOUNT);
if (!recv_buf->page_list)
return -ENOMEM;
for (;;) {
filled = alloc_pages_bulk_array(GFP_KERNEL_ACCOUNT,
npages - done,
recv_buf->page_list + done);
if (!filled)
goto err;
done += filled;
if (done == npages)
break;
}
recv_buf->npages = npages;
return 0;
err:
for (i = 0; i < npages; i++) {
if (recv_buf->page_list[i])
__free_page(recv_buf->page_list[i]);
}
kvfree(recv_buf->page_list);
return -ENOMEM;
}
static int register_dma_recv_pages(struct mlx5_core_dev *mdev,
struct mlx5_vhca_recv_buf *recv_buf)
{
int i, j;
recv_buf->dma_addrs = kvcalloc(recv_buf->npages,
sizeof(*recv_buf->dma_addrs),
GFP_KERNEL_ACCOUNT);
if (!recv_buf->dma_addrs)
return -ENOMEM;
for (i = 0; i < recv_buf->npages; i++) {
recv_buf->dma_addrs[i] = dma_map_page(mdev->device,
recv_buf->page_list[i],
0, PAGE_SIZE,
DMA_FROM_DEVICE);
if (dma_mapping_error(mdev->device, recv_buf->dma_addrs[i]))
goto error;
}
return 0;
error:
for (j = 0; j < i; j++)
dma_unmap_single(mdev->device, recv_buf->dma_addrs[j],
PAGE_SIZE, DMA_FROM_DEVICE);
kvfree(recv_buf->dma_addrs);
return -ENOMEM;
}
static void unregister_dma_recv_pages(struct mlx5_core_dev *mdev,
struct mlx5_vhca_recv_buf *recv_buf)
{
int i;
for (i = 0; i < recv_buf->npages; i++)
dma_unmap_single(mdev->device, recv_buf->dma_addrs[i],
PAGE_SIZE, DMA_FROM_DEVICE);
kvfree(recv_buf->dma_addrs);
}
static void mlx5vf_free_qp_recv_resources(struct mlx5_core_dev *mdev,
struct mlx5_vhca_qp *qp)
{
struct mlx5_vhca_recv_buf *recv_buf = &qp->recv_buf;
mlx5_core_destroy_mkey(mdev, recv_buf->mkey);
unregister_dma_recv_pages(mdev, recv_buf);
free_recv_pages(&qp->recv_buf);
}
static int mlx5vf_alloc_qp_recv_resources(struct mlx5_core_dev *mdev,
struct mlx5_vhca_qp *qp, u32 pdn,
u64 rq_size)
{
unsigned int npages = DIV_ROUND_UP_ULL(rq_size, PAGE_SIZE);
struct mlx5_vhca_recv_buf *recv_buf = &qp->recv_buf;
int err;
err = alloc_recv_pages(recv_buf, npages);
if (err < 0)
return err;
err = register_dma_recv_pages(mdev, recv_buf);
if (err)
goto end;
err = _create_mkey(mdev, pdn, NULL, recv_buf, &recv_buf->mkey);
if (err)
goto err_create_mkey;
return 0;
err_create_mkey:
unregister_dma_recv_pages(mdev, recv_buf);
end:
free_recv_pages(recv_buf);
return err;
}
static void
_mlx5vf_free_page_tracker_resources(struct mlx5vf_pci_core_device *mvdev)
{
struct mlx5_vhca_page_tracker *tracker = &mvdev->tracker;
struct mlx5_core_dev *mdev = mvdev->mdev;
lockdep_assert_held(&mvdev->state_mutex);
if (!mvdev->log_active)
return;
WARN_ON(mvdev->mdev_detach);
mlx5_eq_notifier_unregister(mdev, &tracker->nb);
mlx5vf_cmd_destroy_tracker(mdev, tracker->id);
mlx5vf_destroy_qp(mdev, tracker->fw_qp);
mlx5vf_free_qp_recv_resources(mdev, tracker->host_qp);
mlx5vf_destroy_qp(mdev, tracker->host_qp);
mlx5vf_destroy_cq(mdev, &tracker->cq);
mlx5_core_dealloc_pd(mdev, tracker->pdn);
mlx5_put_uars_page(mdev, tracker->uar);
mvdev->log_active = false;
}
int mlx5vf_stop_page_tracker(struct vfio_device *vdev)
{
struct mlx5vf_pci_core_device *mvdev = container_of(
vdev, struct mlx5vf_pci_core_device, core_device.vdev);
mutex_lock(&mvdev->state_mutex);
if (!mvdev->log_active)
goto end;
_mlx5vf_free_page_tracker_resources(mvdev);
mvdev->log_active = false;
end:
mlx5vf_state_mutex_unlock(mvdev);
return 0;
}
int mlx5vf_start_page_tracker(struct vfio_device *vdev,
struct rb_root_cached *ranges, u32 nnodes,
u64 *page_size)
{
struct mlx5vf_pci_core_device *mvdev = container_of(
vdev, struct mlx5vf_pci_core_device, core_device.vdev);
struct mlx5_vhca_page_tracker *tracker = &mvdev->tracker;
u8 log_tracked_page = ilog2(*page_size);
struct mlx5_vhca_qp *host_qp;
struct mlx5_vhca_qp *fw_qp;
struct mlx5_core_dev *mdev;
u32 max_msg_size = PAGE_SIZE;
u64 rq_size = SZ_2M;
u32 max_recv_wr;
int err;
mutex_lock(&mvdev->state_mutex);
if (mvdev->mdev_detach) {
err = -ENOTCONN;
goto end;
}
if (mvdev->log_active) {
err = -EINVAL;
goto end;
}
mdev = mvdev->mdev;
memset(tracker, 0, sizeof(*tracker));
tracker->uar = mlx5_get_uars_page(mdev);
if (IS_ERR(tracker->uar)) {
err = PTR_ERR(tracker->uar);
goto end;
}
err = mlx5_core_alloc_pd(mdev, &tracker->pdn);
if (err)
goto err_uar;
max_recv_wr = DIV_ROUND_UP_ULL(rq_size, max_msg_size);
err = mlx5vf_create_cq(mdev, tracker, max_recv_wr);
if (err)
goto err_dealloc_pd;
host_qp = mlx5vf_create_rc_qp(mdev, tracker, max_recv_wr);
if (IS_ERR(host_qp)) {
err = PTR_ERR(host_qp);
goto err_cq;
}
host_qp->max_msg_size = max_msg_size;
if (log_tracked_page < MLX5_CAP_ADV_VIRTUALIZATION(mdev,
pg_track_log_min_page_size)) {
log_tracked_page = MLX5_CAP_ADV_VIRTUALIZATION(mdev,
pg_track_log_min_page_size);
} else if (log_tracked_page > MLX5_CAP_ADV_VIRTUALIZATION(mdev,
pg_track_log_max_page_size)) {
log_tracked_page = MLX5_CAP_ADV_VIRTUALIZATION(mdev,
pg_track_log_max_page_size);
}
host_qp->tracked_page_size = (1ULL << log_tracked_page);
err = mlx5vf_alloc_qp_recv_resources(mdev, host_qp, tracker->pdn,
rq_size);
if (err)
goto err_host_qp;
fw_qp = mlx5vf_create_rc_qp(mdev, tracker, 0);
if (IS_ERR(fw_qp)) {
err = PTR_ERR(fw_qp);
goto err_recv_resources;
}
err = mlx5vf_activate_qp(mdev, host_qp, fw_qp->qpn, true);
if (err)
goto err_activate;
err = mlx5vf_activate_qp(mdev, fw_qp, host_qp->qpn, false);
if (err)
goto err_activate;
tracker->host_qp = host_qp;
tracker->fw_qp = fw_qp;
err = mlx5vf_create_tracker(mdev, mvdev, ranges, nnodes);
if (err)
goto err_activate;
MLX5_NB_INIT(&tracker->nb, mlx5vf_event_notifier, NOTIFY_ANY);
mlx5_eq_notifier_register(mdev, &tracker->nb);
*page_size = host_qp->tracked_page_size;
mvdev->log_active = true;
mlx5vf_state_mutex_unlock(mvdev);
return 0;
err_activate:
mlx5vf_destroy_qp(mdev, fw_qp);
err_recv_resources:
mlx5vf_free_qp_recv_resources(mdev, host_qp);
err_host_qp:
mlx5vf_destroy_qp(mdev, host_qp);
err_cq:
mlx5vf_destroy_cq(mdev, &tracker->cq);
err_dealloc_pd:
mlx5_core_dealloc_pd(mdev, tracker->pdn);
err_uar:
mlx5_put_uars_page(mdev, tracker->uar);
end:
mlx5vf_state_mutex_unlock(mvdev);
return err;
}
static void
set_report_output(u32 size, int index, struct mlx5_vhca_qp *qp,
struct iova_bitmap *dirty)
{
u32 entry_size = MLX5_ST_SZ_BYTES(page_track_report_entry);
u32 nent = size / entry_size;
struct page *page;
u64 addr;
u64 *buf;
int i;
if (WARN_ON(index >= qp->recv_buf.npages ||
(nent > qp->max_msg_size / entry_size)))
return;
page = qp->recv_buf.page_list[index];
buf = kmap_local_page(page);
for (i = 0; i < nent; i++) {
addr = MLX5_GET(page_track_report_entry, buf + i,
dirty_address_low);
addr |= (u64)MLX5_GET(page_track_report_entry, buf + i,
dirty_address_high) << 32;
iova_bitmap_set(dirty, addr, qp->tracked_page_size);
}
kunmap_local(buf);
}
static void
mlx5vf_rq_cqe(struct mlx5_vhca_qp *qp, struct mlx5_cqe64 *cqe,
struct iova_bitmap *dirty, int *tracker_status)
{
u32 size;
int ix;
qp->rq.cc++;
*tracker_status = be32_to_cpu(cqe->immediate) >> 28;
size = be32_to_cpu(cqe->byte_cnt);
ix = be16_to_cpu(cqe->wqe_counter) & (qp->rq.wqe_cnt - 1);
/* zero length CQE, no data */
WARN_ON(!size && *tracker_status == MLX5_PAGE_TRACK_STATE_REPORTING);
if (size)
set_report_output(size, ix, qp, dirty);
qp->recv_buf.next_rq_offset = ix * qp->max_msg_size;
mlx5vf_post_recv(qp);
}
static void *get_cqe(struct mlx5_vhca_cq *cq, int n)
{
return mlx5_frag_buf_get_wqe(&cq->buf.fbc, n);
}
static struct mlx5_cqe64 *get_sw_cqe(struct mlx5_vhca_cq *cq, int n)
{
void *cqe = get_cqe(cq, n & (cq->ncqe - 1));
struct mlx5_cqe64 *cqe64;
cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64;
if (likely(get_cqe_opcode(cqe64) != MLX5_CQE_INVALID) &&
!((cqe64->op_own & MLX5_CQE_OWNER_MASK) ^ !!(n & (cq->ncqe)))) {
return cqe64;
} else {
return NULL;
}
}
static int
mlx5vf_cq_poll_one(struct mlx5_vhca_cq *cq, struct mlx5_vhca_qp *qp,
struct iova_bitmap *dirty, int *tracker_status)
{
struct mlx5_cqe64 *cqe;
u8 opcode;
cqe = get_sw_cqe(cq, cq->mcq.cons_index);
if (!cqe)
return CQ_EMPTY;
++cq->mcq.cons_index;
/*
* Make sure we read CQ entry contents after we've checked the
* ownership bit.
*/
rmb();
opcode = get_cqe_opcode(cqe);
switch (opcode) {
case MLX5_CQE_RESP_SEND_IMM:
mlx5vf_rq_cqe(qp, cqe, dirty, tracker_status);
return CQ_OK;
default:
return CQ_POLL_ERR;
}
}
int mlx5vf_tracker_read_and_clear(struct vfio_device *vdev, unsigned long iova,
unsigned long length,
struct iova_bitmap *dirty)
{
struct mlx5vf_pci_core_device *mvdev = container_of(
vdev, struct mlx5vf_pci_core_device, core_device.vdev);
struct mlx5_vhca_page_tracker *tracker = &mvdev->tracker;
struct mlx5_vhca_cq *cq = &tracker->cq;
struct mlx5_core_dev *mdev;
int poll_err, err;
mutex_lock(&mvdev->state_mutex);
if (!mvdev->log_active) {
err = -EINVAL;
goto end;
}
if (mvdev->mdev_detach) {
err = -ENOTCONN;
goto end;
}
mdev = mvdev->mdev;
err = mlx5vf_cmd_modify_tracker(mdev, tracker->id, iova, length,
MLX5_PAGE_TRACK_STATE_REPORTING);
if (err)
goto end;
tracker->status = MLX5_PAGE_TRACK_STATE_REPORTING;
while (tracker->status == MLX5_PAGE_TRACK_STATE_REPORTING &&
!tracker->is_err) {
poll_err = mlx5vf_cq_poll_one(cq, tracker->host_qp, dirty,
&tracker->status);
if (poll_err == CQ_EMPTY) {
mlx5_cq_arm(&cq->mcq, MLX5_CQ_DB_REQ_NOT, tracker->uar->map,
cq->mcq.cons_index);
poll_err = mlx5vf_cq_poll_one(cq, tracker->host_qp,
dirty, &tracker->status);
if (poll_err == CQ_EMPTY) {
wait_for_completion(&mvdev->tracker_comp);
continue;
}
}
if (poll_err == CQ_POLL_ERR) {
err = -EIO;
goto end;
}
mlx5_cq_set_ci(&cq->mcq);
}
if (tracker->status == MLX5_PAGE_TRACK_STATE_ERROR)
tracker->is_err = true;
if (tracker->is_err)
err = -EIO;
end:
mlx5vf_state_mutex_unlock(mvdev);
return err;
}