diff options
| -rw-r--r-- | drivers/firmware/qcom/qcom_scm.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c index df748fa8af4d..00c379a3cceb 100644 --- a/drivers/firmware/qcom/qcom_scm.c +++ b/drivers/firmware/qcom/qcom_scm.c @@ -582,6 +582,13 @@ int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size, * During the scm call memory protection will be enabled for the meta * data blob, so make sure it's physically contiguous, 4K aligned and * non-cachable to avoid XPU violations. + * + * For PIL calls the hypervisor creates SHM Bridges for the blob + * buffers on behalf of Linux so we must not do it ourselves hence + * not using the TZMem allocator here. + * + * If we pass a buffer that is already part of an SHM Bridge to this + * call, it will fail. */ mdata_buf = dma_alloc_coherent(__scm->dev, size, &mdata_phys, GFP_KERNEL); |