Re: [PATCH 2/2] ARM: qcom_defconfig: Enable Qualcomm remoteproc and SMP2P drivers

["Jonathan Neuschäfer" <j.neuschaefer@gmx.net>]

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On Sun, Mar 05, 2017 at 04:49:30PM +0000, Bjorn Andersson wrote:
> On Sun 05 Mar 05:01 GMT 2017, Jonathan Neusch?fer wrote:
[...]
> > FWIW, I enabled CONFIG_QCOM_SMSM on my test system (an Asus Padfone,
> > based on MSM8974; I'm using the Sony Xperia Honami DT because it's close
> > enough), and I think it failed to initialize:
> > 
> 
> Using Honami should work so far, but please do write a patch adding the
> Padfone, so that we don't accidentally break your HW at some point.

I can try how far I get, but unfortunately I don't have hardware
documentation or schematics, because I'm a hobbyist.

> > [    0.647743] qcom-smsm smsm: no smsm size info, using defaults
> > [    0.647775] qcom-smsm smsm: unable to allocate shared state entry
> > 
> 
> Could you please confirm where in qcom_smem_alloc_global() we're
> failing? As far as I can tell we should fail with -EEXIST or if the
> passed "size" parameter is bogus -ENOMEM (but the default number of
> entries really should be less than the amount of free SMEM space).

* qcom_smem_get returns -EPROBE_DEFER:

	void *ptr = ERR_PTR(-EPROBE_DEFER);
	if (!__smem)
		return ptr;

* smsm_get_size_info prints "no smsm size info, using defaults\n"
* qcom_smem_alloc also returns -EPROBE_DEFER early.


BTW, I think smsm_get_size_info is using uninitialized memory here:

        size_t size;    /* is uninitialized */
        struct { ... } *info;

        /* qcom_smem_get returns early without setting size */
        info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_SMSM_SIZE_INFO, &size);

        /*
	 * PTR_ERR(info) is not -ENOENT.
         * size (still uninitialized) is compared with the size of the local
         * struct defined above.
	 */
        if (PTR_ERR(info) == -ENOENT || size != sizeof(*info)) {
                ...
        }

> > I think CONFIG_QCOM_WCNSS_CTRL may be needed too, but I'll leave that
> > for a future patch because I don't understand WCNSS well enough.
> > 
> 
> Missed that one, when the WCNSS firmware boots the WCNSS_CTRL driver is
> probed - it will upload the NV parameter file to the WCNSS "OS" and when
> that is done it will probe the WiFi and BT drivers.
> 
> So, you need it as well.

Ok, I'll add it to this patch.


Jonathan Neuschäfer

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