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misc: fastrpc: make sure memory read and writes are visible

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dma_alloc_coherent buffers could have writes queued in store buffers so
commit them before sending buffer to DSP using correct dma barriers.
Same with vice-versa.

Fixes: c68cfb718c ("misc: fastrpc: Add support for context Invoke method")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Srinivas Kandagatla 2019-03-07 10:12:24 +00:00 committed by Greg Kroah-Hartman
parent b49f6d83e2
commit 415a0729bd
1 changed files with 5 additions and 0 deletions
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5
drivers/misc/fastrpc.c
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@ -792,6 +792,9 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
if (err)
goto bail;
}
/* make sure that all CPU memory writes are seen by DSP */
dma_wmb();
/* Send invoke buffer to remote dsp */
err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
if (err)
@ -808,6 +811,8 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
goto bail;
if (ctx->nscalars) {
/* make sure that all memory writes by DSP are seen by CPU */
dma_rmb();
/* populate all the output buffers with results */
err = fastrpc_put_args(ctx, kernel);
if (err)