linux-kernel - Re: [PATCH v4 09/15] dmaengine: ti: New driver for K3 UDMA

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Date:   Mon, 11 Nov 2019 10:58:28 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     robh+dt@...nel.org, nm@...com, ssantosh@...nel.org,
        dan.j.williams@...el.com, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, grygorii.strashko@...com,
        lokeshvutla@...com, t-kristo@...com, tony@...mide.com,
        j-keerthy@...com
Subject: Re: [PATCH v4 09/15] dmaengine: ti: New driver for K3 UDMA -
 split#1: defines, structs, io func

On 01-11-19, 10:41, Peter Ujfalusi wrote:

> +struct udma_chan {
> +	struct virt_dma_chan vc;
> +	struct dma_slave_config	cfg;
> +	struct udma_dev *ud;
> +	struct udma_desc *desc;
> +	struct udma_desc *terminated_desc;

descriptor and not a list?

> +	struct udma_static_tr static_tr;
> +	char *name;
> +
> +	struct udma_tchan *tchan;
> +	struct udma_rchan *rchan;
> +	struct udma_rflow *rflow;
> +
> +	bool psil_paired;
> +
> +	int irq_num_ring;
> +	int irq_num_udma;
> +
> +	bool cyclic;
> +	bool paused;
> +
> +	enum udma_chan_state state;
> +	struct completion teardown_completed;
> +
> +	u32 bcnt; /* number of bytes completed since the start of the channel */
> +	u32 in_ring_cnt; /* number of descriptors in flight */
> +
> +	bool pkt_mode; /* TR or packet */
> +	bool needs_epib; /* EPIB is needed for the communication or not */
> +	u32 psd_size; /* size of Protocol Specific Data */
> +	u32 metadata_size; /* (needs_epib ? 16:0) + psd_size */
> +	u32 hdesc_size; /* Size of a packet descriptor in packet mode */
> +	bool notdpkt; /* Suppress sending TDC packet */
> +	int remote_thread_id;
> +	u32 src_thread;
> +	u32 dst_thread;
> +	enum psil_endpoint_type ep_type;
> +	bool enable_acc32;
> +	bool enable_burst;
> +	enum udma_tp_level channel_tpl; /* Channel Throughput Level */
> +
> +	/* dmapool for packet mode descriptors */
> +	bool use_dma_pool;
> +	struct dma_pool *hdesc_pool;
> +
> +	u32 id;
> +	enum dma_transfer_direction dir;

why does channel have this, it already exists in descriptor

> +static irqreturn_t udma_udma_irq_handler(int irq, void *data)
> +{
> +	struct udma_chan *uc = data;
> +
> +	udma_tr_event_callback(uc);

any reason why we want to call a fn and not code here..?
-- 
~Vinod