On Wed 15 Jul 14:33 PDT 2015, Andy Gross wrote:
> On Wed, Jul 15, 2015 at 11:58:06AM -0700, Bjorn Andersson wrote:
>
> <snip>
>
> > +int __qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t
> > size)
> > +{
> > + dma_addr_t mdata_phys;
> > + void *mdata_buf;
> > + __le32 scm_ret;
> > + int ret;
> > + struct pas_init_image_req {
> > + __le32 proc;
> > + __le32 image_addr;
> > + } request;
> > +
> > + /*
> > + * 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.
> > + */
> > + mdata_buf = dma_alloc_coherent(NULL, size, &mdata_phys, GFP_KERNEL);
>
> It'd be nice to send in the dev so we can attribute the allocation correctly.
> For 64 bit, we actually have to do this because NULL is not allowed right now.
>
As per Stephen's answer I need to respin this anyways, but I think I
need to read up a little bit more on the implications of passing e.g.
the PIL dev* down here.
> > + if (!mdata_buf) {
> > + pr_err("Allocation of metadata buffer failed.\n");
> > + return -ENOMEM;
> > + }
> > + memcpy(mdata_buf, metadata, size);
> > +
> > + request.proc = cpu_to_le32(peripheral);
> > + request.image_addr = cpu_to_le32(mdata_phys);
> > +
> > + ret = qcom_scm_call(QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_INIT_IMAGE_CMD,
> > + &request, sizeof(request),
> > + &scm_ret, sizeof(scm_ret));
> > +
> > + dma_free_coherent(NULL, size, mdata_buf, mdata_phys);
> > +
> > + return ret ? : le32_to_cpu(scm_ret);
> > +}
> > +
>
> Otherwise, looks good. Let me know if you plan to modify for the device
> above.
> If you want me to do it later, thats fine. But it means API change.
>
I'll respin this in a bit, need to read up a little bit more on the dma
allocation. But most likely I'll just move the allocation to the common
code, pass the physical address here and expect a dev* in the public
api.
Regards,
Bjorn
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