Re: [PATCH v4 02/15] soc: ti: k3: add navss ringacc driver

[Peter Ujfalusi]

On 11/11/2019 6.21, Vinod Koul wrote:
> On 01-11-19, 10:41, Peter Ujfalusi wrote:
>> From: Grygorii Strashko <grygorii.strashko@xxxxxx>
> 
>> +config TI_K3_RINGACC
>> +	tristate "K3 Ring accelerator Sub System"
>> +	depends on ARCH_K3 || COMPILE_TEST
>> +	depends on TI_SCI_INTA_IRQCHIP
>> +	default y
> 
> You want to get an earful from Linus? We dont do default y on new stuff,
> never :)

OK

>> +struct k3_ring_rt_regs {
>> +	u32	resv_16[4];
>> +	u32	db;		/* RT Ring N Doorbell Register */
>> +	u32	resv_4[1];
>> +	u32	occ;		/* RT Ring N Occupancy Register */
>> +	u32	indx;		/* RT Ring N Current Index Register */
>> +	u32	hwocc;		/* RT Ring N Hardware Occupancy Register */
>> +	u32	hwindx;		/* RT Ring N Current Index Register */
> 
> nice comments, how about moving them up into kernel-doc style? (here and
> other places as well)

Sure, I'll convert the comments.

>> +struct k3_ring *k3_ringacc_request_ring(struct k3_ringacc *ringacc,
>> +					int id, u32 flags)
>> +{
>> +	int proxy_id = K3_RINGACC_PROXY_NOT_USED;
>> +
>> +	mutex_lock(&ringacc->req_lock);
>> +
>> +	if (id == K3_RINGACC_RING_ID_ANY) {
>> +		/* Request for any general purpose ring */
>> +		struct ti_sci_resource_desc *gp_rings =
>> +						&ringacc->rm_gp_range->desc[0];
>> +		unsigned long size;
>> +
>> +		size = gp_rings->start + gp_rings->num;
>> +		id = find_next_zero_bit(ringacc->rings_inuse, size,
>> +					gp_rings->start);
>> +		if (id == size)
>> +			goto error;
>> +	} else if (id < 0) {
>> +		goto error;
>> +	}
>> +
>> +	if (test_bit(id, ringacc->rings_inuse) &&
>> +	    !(ringacc->rings[id].flags & K3_RING_FLAG_SHARED))
>> +		goto error;
>> +	else if (ringacc->rings[id].flags & K3_RING_FLAG_SHARED)
>> +		goto out;
>> +
>> +	if (flags & K3_RINGACC_RING_USE_PROXY) {
>> +		proxy_id = find_next_zero_bit(ringacc->proxy_inuse,
>> +					      ringacc->num_proxies, 0);
>> +		if (proxy_id == ringacc->num_proxies)
>> +			goto error;
>> +	}
>> +
>> +	if (!try_module_get(ringacc->dev->driver->owner))
>> +		goto error;
> 
> should this not be one of the first things to do?

I'll move it.

> 
>> +
>> +	if (proxy_id != K3_RINGACC_PROXY_NOT_USED) {
>> +		set_bit(proxy_id, ringacc->proxy_inuse);
>> +		ringacc->rings[id].proxy_id = proxy_id;
>> +		dev_dbg(ringacc->dev, "Giving ring#%d proxy#%d\n", id,
>> +			proxy_id);
>> +	} else {
>> +		dev_dbg(ringacc->dev, "Giving ring#%d\n", id);
>> +	}
> 
> how bout removing else and doing common print?

When the proxy is used we want to print that as well, I think it is
cleaner to have separate prints for the two cases.

- PÃter

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