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misc: fastrpc: Add fdlist implementation 

Add fdlist implementation to support dma handles. fdlist is populated by
DSP if any map is no longer used and it is freed during put_args.

Signed-off-by: Vamsi Krishna Gattupalli <quic_vgattupa@quicinc.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220214161002.6831-11-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vamsi Krishna Gattupalli 2022-02-14 16:10:00 +00:00 committed by Greg Kroah-Hartman
parent 54f7c85be3
commit 8f6c1d8c4f
1 changed files with 32 additions and 4 deletions
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36
drivers/misc/fastrpc.c
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@ -320,7 +320,8 @@ static void fastrpc_map_get(struct fastrpc_map *map)
kref_get(&map->refcount);
}
static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
static int fastrpc_map_lookup(struct fastrpc_user *fl, int fd,
struct fastrpc_map **ppmap)
{
struct fastrpc_map *map = NULL;
@ -328,7 +329,6 @@ static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
mutex_lock(&fl->mutex);
list_for_each_entry(map, &fl->maps, node) {
if (map->fd == fd) {
fastrpc_map_get(map);
*ppmap = map;
mutex_unlock(&fl->mutex);
return 0;
@ -339,6 +339,17 @@ static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
return -ENOENT;
}
static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
struct fastrpc_map **ppmap)
{
int ret = fastrpc_map_lookup(fl, fd, ppmap);
if (!ret)
fastrpc_map_get(*ppmap);
return ret;
}
static void fastrpc_buf_free(struct fastrpc_buf *buf)
{
dma_free_coherent(buf->dev, buf->size, buf->virt,
@ -411,7 +422,7 @@ static void fastrpc_context_free(struct kref *ref)
ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount);
cctx = ctx->cctx;
for (i = 0; i < ctx->nscalars; i++)
for (i = 0; i < ctx->nbufs; i++)
fastrpc_map_put(ctx->maps[i]);
if (ctx->buf)
@ -969,9 +980,19 @@ static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
u32 kernel)
{
struct fastrpc_remote_arg *rpra = ctx->rpra;
int i, inbufs;
struct fastrpc_user *fl = ctx->fl;
struct fastrpc_map *mmap = NULL;
struct fastrpc_invoke_buf *list;
struct fastrpc_phy_page *pages;
u64 *fdlist;
int i, inbufs, outbufs, handles;
inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
outbufs = REMOTE_SCALARS_OUTBUFS(ctx->sc);
handles = REMOTE_SCALARS_INHANDLES(ctx->sc) + REMOTE_SCALARS_OUTHANDLES(ctx->sc);
list = fastrpc_invoke_buf_start(rpra, ctx->nscalars);
pages = fastrpc_phy_page_start(list, ctx->nscalars);
fdlist = (uint64_t *)(pages + inbufs + outbufs + handles);
for (i = inbufs; i < ctx->nbufs; ++i) {
if (!ctx->maps[i]) {
@ -988,6 +1009,13 @@ static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
}
}
for (i = 0; i < FASTRPC_MAX_FDLIST; i++) {
if (!fdlist[i])
break;
if (!fastrpc_map_lookup(fl, (int)fdlist[i], &mmap))
fastrpc_map_put(mmap);
}
return 0;
}