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misc: fastrpc: copy to user only for non-DMA-BUF heap buffers 

fastrpc_put_args is copying all the output buffers to user. For large
number of output context buffers, this might cause performance
degradation. Copying is not needed for DMA-BUF heap buffers.

Signed-off-by: Jeya R <jeyr@codeaurora.org>
Link: https://lore.kernel.org/r/1632386272-18139-1-git-send-email-jeyr@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeya R 2021-09-23 14:07:52 +05:30 committed by Greg Kroah-Hartman
parent 304b0ba0a2
commit 847afd7bd5
1 changed files with 10 additions and 8 deletions
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18
drivers/misc/fastrpc.c
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@ -890,15 +890,17 @@ static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
for (i = inbufs; i < ctx->nbufs; ++i) {
void *src = (void *)(uintptr_t)rpra[i].pv;
void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
u64 len = rpra[i].len;
if (!ctx->maps[i]) {
void *src = (void *)(uintptr_t)rpra[i].pv;
void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
u64 len = rpra[i].len;
if (!kernel) {
if (copy_to_user((void __user *)dst, src, len))
return -EFAULT;
} else {
memcpy(dst, src, len);
if (!kernel) {
if (copy_to_user((void __user *)dst, src, len))
return -EFAULT;
} else {
memcpy(dst, src, len);
}
}
}