// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/* Copyright (c) 2020 Mellanox Technologies Ltd. */
#include <linux/vhost_types.h>
#include <linux/vdpa.h>
#include <linux/gcd.h>
#include <linux/string.h>
#include <linux/mlx5/qp.h>
#include "mlx5_vdpa.h"
/* DIV_ROUND_UP where the divider is a power of 2 give by its log base 2 value */
#define MLX5_DIV_ROUND_UP_POW2(_n, _s) \
({ \
u64 __s = _s; \
u64 _res; \
_res = (((_n) + (1 << (__s)) - 1) >> (__s)); \
_res; \
})
static int get_octo_len(u64 len, int page_shift)
{
u64 page_size = 1ULL << page_shift;
int npages;
npages = ALIGN(len, page_size) >> page_shift;
return (npages + 1) / 2;
}
static void mlx5_set_access_mode(void *mkc, int mode)
{
MLX5_SET(mkc, mkc, access_mode_1_0, mode & 0x3);
MLX5_SET(mkc, mkc, access_mode_4_2, mode >> 2);
}
static void populate_mtts(struct mlx5_vdpa_direct_mr *mr, __be64 *mtt)
{
struct scatterlist *sg;
int nsg = mr->nsg;
u64 dma_addr;
u64 dma_len;
int j = 0;
int i;
for_each_sg(mr->sg_head.sgl, sg, mr->nent, i) {
for (dma_addr = sg_dma_address(sg), dma_len = sg_dma_len(sg);
nsg && dma_len;
nsg--, dma_addr += BIT(mr->log_size), dma_len -= BIT(mr->log_size))
mtt[j++] = cpu_to_be64(dma_addr);
}
}
struct mlx5_create_mkey_mem {
u8 out[MLX5_ST_SZ_BYTES(create_mkey_out)];
u8 in[MLX5_ST_SZ_BYTES(create_mkey_in)];
__be64 mtt[];
};
struct mlx5_destroy_mkey_mem {
u8 out[MLX5_ST_SZ_BYTES(destroy_mkey_out)];
u8 in[MLX5_ST_SZ_BYTES(destroy_mkey_in)];
};
static void fill_create_direct_mr(struct mlx5_vdpa_dev *mvdev,
struct mlx5_vdpa_direct_mr *mr,
struct mlx5_create_mkey_mem *mem)
{
void *in = &mem->in;
void *mkc;
MLX5_SET(create_mkey_in, in, uid, mvdev->res.uid);
mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
MLX5_SET(mkc, mkc, lw, !!(mr->perm & VHOST_MAP_WO));
MLX5_SET(mkc, mkc, lr, !!(mr->perm & VHOST_MAP_RO));
mlx5_set_access_mode(mkc, MLX5_MKC_ACCESS_MODE_MTT);
MLX5_SET(mkc, mkc, qpn, 0xffffff);
MLX5_SET(mkc, mkc, pd, mvdev->res.pdn);
MLX5_SET64(mkc, mkc, start_addr, mr->offset);
MLX5_SET64(mkc, mkc, len, mr->end - mr->start);
MLX5_SET(mkc, mkc, log_page_size, mr->log_size);
MLX5_SET(mkc, mkc, translations_octword_size,
get_octo_len(mr->end - mr->start, mr->log_size));
MLX5_SET(create_mkey_in, in, translations_octword_actual_size,
get_octo_len(mr->end - mr->start, mr->log_size));
populate_mtts(mr, MLX5_ADDR_OF(create_mkey_in, in, klm_pas_mtt));
MLX5_SET(create_mkey_in, in, opcode, MLX5_CMD_OP_CREATE_MKEY);
MLX5_SET(create_mkey_in, in, uid, mvdev->res.uid);
}
static void create_direct_mr_end(struct mlx5_vdpa_dev *mvdev,
struct mlx5_vdpa_direct_mr *mr,
struct mlx5_create_mkey_mem *mem)
{
u32 mkey_index = MLX5_GET(create_mkey_out, mem->out, mkey_index);
mr->mr = mlx5_idx_to_mkey(mkey_index);
}
static void fill_destroy_direct_mr(struct mlx5_vdpa_dev *mvdev,
struct mlx5_vdpa_direct_mr *mr,
struct mlx5_destroy_mkey_mem *mem)
{
void *in = &mem->in;
MLX5_SET(destroy_mkey_in, in, uid, mvdev->res.uid);
MLX5_SET(destroy_mkey_in, in, opcode, MLX5_CMD_OP_DESTROY_MKEY);
MLX5_SET(destroy_mkey_in, in, mkey_index, mlx5_mkey_to_idx(mr->mr));
}
static void destroy_direct_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_direct_mr *mr)
{
if (!mr->mr)
return;
mlx5_vdpa_destroy_mkey(mvdev, mr->mr);
}
static u64 map_start(struct vhost_iotlb_map *map, struct mlx5_vdpa_direct_mr *mr)
{
return max_t(u64, map->start, mr->start);
}
static u64 map_end(struct vhost_iotlb_map *map, struct mlx5_vdpa_direct_mr *mr)
{
return min_t(u64, map->last + 1, mr->end);
}
static u64 maplen(struct vhost_iotlb_map *map, struct mlx5_vdpa_direct_mr *mr)
{
return map_end(map, mr) - map_start(map, mr);
}
#define MLX5_VDPA_INVALID_START_ADDR ((u64)-1)
#define MLX5_VDPA_INVALID_LEN ((u64)-1)
static u64 indir_start_addr(struct mlx5_vdpa_mr *mkey)
{
struct mlx5_vdpa_direct_mr *s;
s = list_first_entry_or_null(&mkey->head, struct mlx5_vdpa_direct_mr, list);
if (!s)
return MLX5_VDPA_INVALID_START_ADDR;
return s->start;
}
static u64 indir_len(struct mlx5_vdpa_mr *mkey)
{
struct mlx5_vdpa_direct_mr *s;
struct mlx5_vdpa_direct_mr *e;
s = list_first_entry_or_null(&mkey->head, struct mlx5_vdpa_direct_mr, list);
if (!s)
return MLX5_VDPA_INVALID_LEN;
e = list_last_entry(&mkey->head, struct mlx5_vdpa_direct_mr, list);
return e->end - s->start;
}
#define LOG_MAX_KLM_SIZE 30
#define MAX_KLM_SIZE BIT(LOG_MAX_KLM_SIZE)
static u32 klm_bcount(u64 size)
{
return (u32)size;
}
static void fill_indir(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *mkey, void *in)
{
struct mlx5_vdpa_direct_mr *dmr;
struct mlx5_klm *klmarr;
struct mlx5_klm *klm;
bool first = true;
u64 preve;
int i;
klmarr = MLX5_ADDR_OF(create_mkey_in, in, klm_pas_mtt);
i = 0;
list_for_each_entry(dmr, &mkey->head, list) {
again:
klm = &klmarr[i++];
if (first) {
preve = dmr->start;
first = false;
}
if (preve == dmr->start) {
klm->key = cpu_to_be32(dmr->mr);
klm->bcount = cpu_to_be32(klm_bcount(dmr->end - dmr->start));
preve = dmr->end;
} else {
klm->key = cpu_to_be32(mvdev->res.null_mkey);
klm->bcount = cpu_to_be32(klm_bcount(dmr->start - preve));
preve = dmr->start;
goto again;
}
}
}
static int klm_byte_size(int nklms)
{
return 16 * ALIGN(nklms, 4);
}
#define MLX5_VDPA_MTT_ALIGN 16
static int create_direct_keys(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *mr)
{
struct mlx5_vdpa_async_cmd *cmds;
struct mlx5_vdpa_direct_mr *dmr;
int err = 0;
int i = 0;
cmds = kvcalloc(mr->num_directs, sizeof(*cmds), GFP_KERNEL);
if (!cmds)
return -ENOMEM;
list_for_each_entry(dmr, &mr->head, list) {
struct mlx5_create_mkey_mem *cmd_mem;
int mttlen, mttcount;
mttlen = roundup(MLX5_ST_SZ_BYTES(mtt) * dmr->nsg, MLX5_VDPA_MTT_ALIGN);
mttcount = mttlen / sizeof(cmd_mem->mtt[0]);
cmd_mem = kvcalloc(1, struct_size(cmd_mem, mtt, mttcount), GFP_KERNEL);
if (!cmd_mem) {
err = -ENOMEM;
goto done;
}
cmds[i].out = cmd_mem->out;
cmds[i].outlen = sizeof(cmd_mem->out);
cmds[i].in = cmd_mem->in;
cmds[i].inlen = struct_size(cmd_mem, mtt, mttcount);
fill_create_direct_mr(mvdev, dmr, cmd_mem);
i++;
}
err = mlx5_vdpa_exec_async_cmds(mvdev, cmds, mr->num_directs);
if (err) {
mlx5_vdpa_err(mvdev, "error issuing MTT mkey creation for direct mrs: %d\n", err);
goto done;
}
i = 0;
list_for_each_entry(dmr, &mr->head, list) {
struct mlx5_vdpa_async_cmd *cmd = &cmds[i++];
struct mlx5_create_mkey_mem *cmd_mem;
cmd_mem = container_of(cmd->out, struct mlx5_create_mkey_mem, out);
if (!cmd->err) {
create_direct_mr_end(mvdev, dmr, cmd_mem);
} else {
err = err ? err : cmd->err;
mlx5_vdpa_err(mvdev, "error creating MTT mkey [0x%llx, 0x%llx]: %d\n",
dmr->start, dmr->end, cmd->err);
}
}
done:
for (i = i-1; i >= 0; i--) {
struct mlx5_create_mkey_mem *cmd_mem;
cmd_mem = container_of(cmds[i].out, struct mlx5_create_mkey_mem, out);
kvfree(cmd_mem);
}
kvfree(cmds);
return err;
}
DEFINE_FREE(free_cmds, struct mlx5_vdpa_async_cmd *, kvfree(_T))
DEFINE_FREE(free_cmd_mem, struct mlx5_destroy_mkey_mem *, kvfree(_T))
static int destroy_direct_keys(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *mr)
{
struct mlx5_destroy_mkey_mem *cmd_mem __free(free_cmd_mem) = NULL;
struct mlx5_vdpa_async_cmd *cmds __free(free_cmds) = NULL;
struct mlx5_vdpa_direct_mr *dmr;
int err = 0;
int i = 0;
cmds = kvcalloc(mr->num_directs, sizeof(*cmds), GFP_KERNEL);
cmd_mem = kvcalloc(mr->num_directs, sizeof(*cmd_mem), GFP_KERNEL);
if (!cmds || !cmd_mem)
return -ENOMEM;
list_for_each_entry(dmr, &mr->head, list) {
cmds[i].out = cmd_mem[i].out;
cmds[i].outlen = sizeof(cmd_mem[i].out);
cmds[i].in = cmd_mem[i].in;
cmds[i].inlen = sizeof(cmd_mem[i].in);
fill_destroy_direct_mr(mvdev, dmr, &cmd_mem[i]);
i++;
}
err = mlx5_vdpa_exec_async_cmds(mvdev, cmds, mr->num_directs);
if (err) {
mlx5_vdpa_err(mvdev, "error issuing MTT mkey deletion for direct mrs: %d\n", err);
return err;
}
i = 0;
list_for_each_entry(dmr, &mr->head, list) {
struct mlx5_vdpa_async_cmd *cmd = &cmds[i++];
dmr->mr = 0;
if (cmd->err) {
err = err ? err : cmd->err;
mlx5_vdpa_err(mvdev, "error deleting MTT mkey [0x%llx, 0x%llx]: %d\n",
dmr->start, dmr->end, cmd->err);
}
}
return err;
}
static int create_indirect_key(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *mr)
{
int inlen;
void *mkc;
void *in;
int err;
u64 start;
u64 len;
start = indir_start_addr(mr);
len = indir_len(mr);
if (start == MLX5_VDPA_INVALID_START_ADDR || len == MLX5_VDPA_INVALID_LEN)
return -EINVAL;
inlen = MLX5_ST_SZ_BYTES(create_mkey_in) + klm_byte_size(mr->num_klms);
in = kzalloc(inlen, GFP_KERNEL);
if (!in)
return -ENOMEM;
MLX5_SET(create_mkey_in, in, uid, mvdev->res.uid);
mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
MLX5_SET(mkc, mkc, lw, 1);
MLX5_SET(mkc, mkc, lr, 1);
mlx5_set_access_mode(mkc, MLX5_MKC_ACCESS_MODE_KLMS);
MLX5_SET(mkc, mkc, qpn, 0xffffff);
MLX5_SET(mkc, mkc, pd, mvdev->res.pdn);
MLX5_SET64(mkc, mkc, start_addr, start);
MLX5_SET64(mkc, mkc, len, len);
MLX5_SET(mkc, mkc, translations_octword_size, klm_byte_size(mr->num_klms) / 16);
MLX5_SET(create_mkey_in, in, translations_octword_actual_size, mr->num_klms);
fill_indir(mvdev, mr, in);
err = mlx5_vdpa_create_mkey(mvdev, &mr->mkey, in, inlen);
kfree(in);
return err;
}
static void destroy_indirect_key(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *mkey)
{
mlx5_vdpa_destroy_mkey(mvdev, mkey->mkey);
}
static int map_direct_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_direct_mr *mr,
struct vhost_iotlb *iotlb)
{
struct vhost_iotlb_map *map;
unsigned long lgcd = 0;
int log_entity_size;
unsigned long size;
u64 start = 0;
int err;
struct page *pg;
unsigned int nsg;
int sglen;
u64 pa;
u64 paend;
struct scatterlist *sg;
struct device *dma = mvdev->vdev.dma_dev;
for (map = vhost_iotlb_itree_first(iotlb, mr->start, mr->end - 1);
map; map = vhost_iotlb_itree_next(map, start, mr->end - 1)) {
size = maplen(map, mr);
lgcd = gcd(lgcd, size);
start += size;
}
log_entity_size = ilog2(lgcd);
sglen = 1 << log_entity_size;
nsg = MLX5_DIV_ROUND_UP_POW2(mr->end - mr->start, log_entity_size);
err = sg_alloc_table(&mr->sg_head, nsg, GFP_KERNEL);
if (err)
return err;
sg = mr->sg_head.sgl;
for (map = vhost_iotlb_itree_first(iotlb, mr->start, mr->end - 1);
map; map = vhost_iotlb_itree_next(map, mr->start, mr->end - 1)) {
paend = map->addr + maplen(map, mr);
for (pa = map->addr; pa < paend; pa += sglen) {
pg = pfn_to_page(__phys_to_pfn(pa));
if (!sg) {
mlx5_vdpa_warn(mvdev, "sg null. start 0x%llx, end 0x%llx\n",
map->start, map->last + 1);
err = -ENOMEM;
goto err_map;
}
sg_set_page(sg, pg, sglen, 0);
sg = sg_next(sg);
if (!sg)
goto done;
}
}
done:
mr->log_size = log_entity_size;
mr->nsg = nsg;
mr->nent = dma_map_sg_attrs(dma, mr->sg_head.sgl, mr->nsg, DMA_BIDIRECTIONAL, 0);
if (!mr->nent) {
err = -ENOMEM;
goto err_map;
}
return 0;
err_map:
sg_free_table(&mr->sg_head);
return err;
}
static void unmap_direct_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_direct_mr *mr)
{
struct device *dma = mvdev->vdev.dma_dev;
destroy_direct_mr(mvdev, mr);
dma_unmap_sg_attrs(dma, mr->sg_head.sgl, mr->nsg, DMA_BIDIRECTIONAL, 0);
sg_free_table(&mr->sg_head);
}
static int add_direct_chain(struct mlx5_vdpa_dev *mvdev,
struct mlx5_vdpa_mr *mr,
u64 start,
u64 size,
u8 perm,
struct vhost_iotlb *iotlb)
{
struct mlx5_vdpa_direct_mr *dmr;
struct mlx5_vdpa_direct_mr *n;
LIST_HEAD(tmp);
u64 st;
u64 sz;
int err;
st = start;
while (size) {
sz = (u32)min_t(u64, MAX_KLM_SIZE, size);
dmr = kzalloc(sizeof(*dmr), GFP_KERNEL);
if (!dmr) {
err = -ENOMEM;
goto err_alloc;
}
dmr->start = st;
dmr->end = st + sz;
dmr->perm = perm;
err = map_direct_mr(mvdev, dmr, iotlb);
if (err) {
kfree(dmr);
goto err_alloc;
}
list_add_tail(&dmr->list, &tmp);
size -= sz;
mr->num_directs++;
mr->num_klms++;
st += sz;
}
list_splice_tail(&tmp, &mr->head);
return 0;
err_alloc:
list_for_each_entry_safe(dmr, n, &mr->head, list) {
list_del_init(&dmr->list);
unmap_direct_mr(mvdev, dmr);
kfree(dmr);
}
return err;
}
/* The iotlb pointer contains a list of maps. Go over the maps, possibly
* merging mergeable maps, and create direct memory keys that provide the
* device access to memory. The direct mkeys are then referred to by the
* indirect memory key that provides access to the enitre address space given
* by iotlb.
*/
static int create_user_mr(struct mlx5_vdpa_dev *mvdev,
struct mlx5_vdpa_mr *mr,
struct vhost_iotlb *iotlb)
{
struct mlx5_vdpa_direct_mr *dmr;
struct mlx5_vdpa_direct_mr *n;
struct vhost_iotlb_map *map;
u32 pperm = U16_MAX;
u64 last = U64_MAX;
u64 ps = U64_MAX;
u64 pe = U64_MAX;
u64 start = 0;
int err = 0;
int nnuls;
INIT_LIST_HEAD(&mr->head);
for (map = vhost_iotlb_itree_first(iotlb, start, last); map;
map = vhost_iotlb_itree_next(map, start, last)) {
start = map->start;
if (pe == map->start && pperm == map->perm) {
pe = map->last + 1;
} else {
if (ps != U64_MAX) {
if (pe < map->start) {
/* We have a hole in the map. Check how
* many null keys are required to fill it.
*/
nnuls = MLX5_DIV_ROUND_UP_POW2(map->start - pe,
LOG_MAX_KLM_SIZE);
mr->num_klms += nnuls;
}
err = add_direct_chain(mvdev, mr, ps, pe - ps, pperm, iotlb);
if (err)
goto err_chain;
}
ps = map->start;
pe = map->last + 1;
pperm = map->perm;
}
}
err = add_direct_chain(mvdev, mr, ps, pe - ps, pperm, iotlb);
if (err)
goto err_chain;
err = create_direct_keys(mvdev, mr);
if (err)
goto err_chain;
/* Create the memory key that defines the guests's address space. This
* memory key refers to the direct keys that contain the MTT
* translations
*/
err = create_indirect_key(mvdev, mr);
if (err)
goto err_chain;
mr->user_mr = true;
return 0;
err_chain:
list_for_each_entry_safe_reverse(dmr, n, &mr->head, list) {
list_del_init(&dmr->list);
unmap_direct_mr(mvdev, dmr);
kfree(dmr);
}
return err;
}
static int create_dma_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *mr)
{
int inlen = MLX5_ST_SZ_BYTES(create_mkey_in);
void *mkc;
u32 *in;
int err;
in = kzalloc(inlen, GFP_KERNEL);
if (!in)
return -ENOMEM;
mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
MLX5_SET(mkc, mkc, access_mode_1_0, MLX5_MKC_ACCESS_MODE_PA);
MLX5_SET(mkc, mkc, length64, 1);
MLX5_SET(mkc, mkc, lw, 1);
MLX5_SET(mkc, mkc, lr, 1);
MLX5_SET(mkc, mkc, pd, mvdev->res.pdn);
MLX5_SET(mkc, mkc, qpn, 0xffffff);
err = mlx5_vdpa_create_mkey(mvdev, &mr->mkey, in, inlen);
if (!err)
mr->user_mr = false;
kfree(in);
return err;
}
static void destroy_dma_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *mr)
{
mlx5_vdpa_destroy_mkey(mvdev, mr->mkey);
}
static int dup_iotlb(struct vhost_iotlb *dst, struct vhost_iotlb *src)
{
struct vhost_iotlb_map *map;
u64 start = 0, last = ULLONG_MAX;
int err;
if (dst == src)
return -EINVAL;
if (!src) {
err = vhost_iotlb_add_range(dst, start, last, start, VHOST_ACCESS_RW);
return err;
}
for (map = vhost_iotlb_itree_first(src, start, last); map;
map = vhost_iotlb_itree_next(map, start, last)) {
err = vhost_iotlb_add_range(dst, map->start, map->last,
map->addr, map->perm);
if (err)
return err;
}
return 0;
}
static void prune_iotlb(struct vhost_iotlb *iotlb)
{
vhost_iotlb_del_range(iotlb, 0, ULLONG_MAX);
}
static void destroy_user_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *mr)
{
struct mlx5_vdpa_direct_mr *dmr;
struct mlx5_vdpa_direct_mr *n;
destroy_indirect_key(mvdev, mr);
destroy_direct_keys(mvdev, mr);
list_for_each_entry_safe_reverse(dmr, n, &mr->head, list) {
list_del_init(&dmr->list);
unmap_direct_mr(mvdev, dmr);
kfree(dmr);
}
}
static void _mlx5_vdpa_destroy_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *mr)
{
if (WARN_ON(!mr))
return;
if (mr->user_mr)
destroy_user_mr(mvdev, mr);
else
destroy_dma_mr(mvdev, mr);
vhost_iotlb_free(mr->iotlb);
list_del(&mr->mr_list);
kfree(mr);
}
/* There can be multiple .set_map() operations in quick succession.
* This large delay is a simple way to prevent the MR cleanup from blocking
* .set_map() MR creation in this scenario.
*/
#define MLX5_VDPA_MR_GC_TRIGGER_MS 2000
static void mlx5_vdpa_mr_gc_handler(struct work_struct *work)
{
struct mlx5_vdpa_mr_resources *mres;
struct mlx5_vdpa_mr *mr, *tmp;
struct mlx5_vdpa_dev *mvdev;
mres = container_of(work, struct mlx5_vdpa_mr_resources, gc_dwork_ent.work);
if (atomic_read(&mres->shutdown)) {
mutex_lock(&mres->lock);
} else if (!mutex_trylock(&mres->lock)) {
queue_delayed_work(mres->wq_gc, &mres->gc_dwork_ent,
msecs_to_jiffies(MLX5_VDPA_MR_GC_TRIGGER_MS));
return;
}
mvdev = container_of(mres, struct mlx5_vdpa_dev, mres);
list_for_each_entry_safe(mr, tmp, &mres->mr_gc_list_head, mr_list) {
_mlx5_vdpa_destroy_mr(mvdev, mr);
}
mutex_unlock(&mres->lock);
}
static void _mlx5_vdpa_put_mr(struct mlx5_vdpa_dev *mvdev,
struct mlx5_vdpa_mr *mr)
{
struct mlx5_vdpa_mr_resources *mres = &mvdev->mres;
if (!mr)
return;
if (refcount_dec_and_test(&mr->refcount)) {
list_move_tail(&mr->mr_list, &mres->mr_gc_list_head);
queue_delayed_work(mres->wq_gc, &mres->gc_dwork_ent,
msecs_to_jiffies(MLX5_VDPA_MR_GC_TRIGGER_MS));
}
}
void mlx5_vdpa_put_mr(struct mlx5_vdpa_dev *mvdev,
struct mlx5_vdpa_mr *mr)
{
mutex_lock(&mvdev->mres.lock);
_mlx5_vdpa_put_mr(mvdev, mr);
mutex_unlock(&mvdev->mres.lock);
}
static void _mlx5_vdpa_get_mr(struct mlx5_vdpa_dev *mvdev,
struct mlx5_vdpa_mr *mr)
{
if (!mr)
return;
refcount_inc(&mr->refcount);
}
void mlx5_vdpa_get_mr(struct mlx5_vdpa_dev *mvdev,
struct mlx5_vdpa_mr *mr)
{
mutex_lock(&mvdev->mres.lock);
_mlx5_vdpa_get_mr(mvdev, mr);
mutex_unlock(&mvdev->mres.lock);
}
void mlx5_vdpa_update_mr(struct mlx5_vdpa_dev *mvdev,
struct mlx5_vdpa_mr *new_mr,
unsigned int asid)
{
struct mlx5_vdpa_mr *old_mr = mvdev->mres.mr[asid];
mutex_lock(&mvdev->mres.lock);
_mlx5_vdpa_put_mr(mvdev, old_mr);
mvdev->mres.mr[asid] = new_mr;
mutex_unlock(&mvdev->mres.lock);
}
static void mlx5_vdpa_show_mr_leaks(struct mlx5_vdpa_dev *mvdev)
{
struct mlx5_vdpa_mr *mr;
mutex_lock(&mvdev->mres.lock);
list_for_each_entry(mr, &mvdev->mres.mr_list_head, mr_list) {
mlx5_vdpa_warn(mvdev, "mkey still alive after resource delete: "
"mr: %p, mkey: 0x%x, refcount: %u\n",
mr, mr->mkey, refcount_read(&mr->refcount));
}
mutex_unlock(&mvdev->mres.lock);
}
void mlx5_vdpa_clean_mrs(struct mlx5_vdpa_dev *mvdev)
{
if (!mvdev->res.valid)
return;
for (int i = 0; i < MLX5_VDPA_NUM_AS; i++)
mlx5_vdpa_update_mr(mvdev, NULL, i);
prune_iotlb(mvdev->cvq.iotlb);
mlx5_vdpa_show_mr_leaks(mvdev);
}
static int _mlx5_vdpa_create_mr(struct mlx5_vdpa_dev *mvdev,
struct mlx5_vdpa_mr *mr,
struct vhost_iotlb *iotlb)
{
int err;
if (iotlb)
err = create_user_mr(mvdev, mr, iotlb);
else
err = create_dma_mr(mvdev, mr);
if (err)
return err;
mr->iotlb = vhost_iotlb_alloc(0, 0);
if (!mr->iotlb) {
err = -ENOMEM;
goto err_mr;
}
err = dup_iotlb(mr->iotlb, iotlb);
if (err)
goto err_iotlb;
list_add_tail(&mr->mr_list, &mvdev->mres.mr_list_head);
return 0;
err_iotlb:
vhost_iotlb_free(mr->iotlb);
err_mr:
if (iotlb)
destroy_user_mr(mvdev, mr);
else
destroy_dma_mr(mvdev, mr);
return err;
}
struct mlx5_vdpa_mr *mlx5_vdpa_create_mr(struct mlx5_vdpa_dev *mvdev,
struct vhost_iotlb *iotlb)
{
struct mlx5_vdpa_mr *mr;
int err;
mr = kzalloc(sizeof(*mr), GFP_KERNEL);
if (!mr)
return ERR_PTR(-ENOMEM);
mutex_lock(&mvdev->mres.lock);
err = _mlx5_vdpa_create_mr(mvdev, mr, iotlb);
mutex_unlock(&mvdev->mres.lock);
if (err)
goto out_err;
refcount_set(&mr->refcount, 1);
return mr;
out_err:
kfree(mr);
return ERR_PTR(err);
}
int mlx5_vdpa_update_cvq_iotlb(struct mlx5_vdpa_dev *mvdev,
struct vhost_iotlb *iotlb,
unsigned int asid)
{
int err;
if (mvdev->mres.group2asid[MLX5_VDPA_CVQ_GROUP] != asid)
return 0;
spin_lock(&mvdev->cvq.iommu_lock);
prune_iotlb(mvdev->cvq.iotlb);
err = dup_iotlb(mvdev->cvq.iotlb, iotlb);
spin_unlock(&mvdev->cvq.iommu_lock);
return err;
}
int mlx5_vdpa_create_dma_mr(struct mlx5_vdpa_dev *mvdev)
{
struct mlx5_vdpa_mr *mr;
mr = mlx5_vdpa_create_mr(mvdev, NULL);
if (IS_ERR(mr))
return PTR_ERR(mr);
mlx5_vdpa_update_mr(mvdev, mr, 0);
return mlx5_vdpa_update_cvq_iotlb(mvdev, NULL, 0);
}
int mlx5_vdpa_reset_mr(struct mlx5_vdpa_dev *mvdev, unsigned int asid)
{
if (asid >= MLX5_VDPA_NUM_AS)
return -EINVAL;
mlx5_vdpa_update_mr(mvdev, NULL, asid);
if (asid == 0 && MLX5_CAP_GEN(mvdev->mdev, umem_uid_0)) {
if (mlx5_vdpa_create_dma_mr(mvdev))
mlx5_vdpa_warn(mvdev, "create DMA MR failed\n");
} else {
mlx5_vdpa_update_cvq_iotlb(mvdev, NULL, asid);
}
return 0;
}
int mlx5_vdpa_init_mr_resources(struct mlx5_vdpa_dev *mvdev)
{
struct mlx5_vdpa_mr_resources *mres = &mvdev->mres;
mres->wq_gc = create_singlethread_workqueue("mlx5_vdpa_mr_gc");
if (!mres->wq_gc)
return -ENOMEM;
INIT_DELAYED_WORK(&mres->gc_dwork_ent, mlx5_vdpa_mr_gc_handler);
mutex_init(&mres->lock);
INIT_LIST_HEAD(&mres->mr_list_head);
INIT_LIST_HEAD(&mres->mr_gc_list_head);
return 0;
}
void mlx5_vdpa_destroy_mr_resources(struct mlx5_vdpa_dev *mvdev)
{
struct mlx5_vdpa_mr_resources *mres = &mvdev->mres;
atomic_set(&mres->shutdown, 1);
flush_delayed_work(&mres->gc_dwork_ent);
destroy_workqueue(mres->wq_gc);
mres->wq_gc = NULL;
mutex_destroy(&mres->lock);
}
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