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Message-ID: <800ccf2e-65cc-4524-8a42-1657a5906482@gmail.com>
Date: Thu, 14 Dec 2023 17:41:37 +0200
From: Péter Ujfalusi <peter.ujfalusi@...il.com>
To: Siddharth Vadapalli <s-vadapalli@...com>, vkoul@...nel.org
Cc: dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, srk@...com, vigneshr@...com
Subject: Re: [PATCH v2 3/4] dmaengine: ti: k3-udma-glue: Add function to
request TX channel by ID
On 12/12/2023 13:10, Siddharth Vadapalli wrote:
> The existing function k3_udma_glue_request_tx_chn() supports requesting
> a TX DMA channel by its name. Add support to request TX channel by ID in
> the form of a new function k3_udma_glue_request_tx_chn_by_id() and export
> it for use by drivers which are probed by alternate methods (non
> device-tree) but still wish to make use of the existing DMA APIs. Such
> drivers could be informed about the TX channel to use by RPMsg for example.
>
> Since the implementation of k3_udma_glue_request_tx_chn_by_id() reuses
> most of the code in k3_udma_glue_request_tx_chn(), create a new function
> for the common code named as k3_udma_glue_request_tx_chn_common().
>
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
> ---
> Changes since v1:
> - Updated commit message indicating the use-case for which the patch is
> being added.
>
> drivers/dma/ti/k3-udma-glue.c | 101 +++++++++++++++++++++++--------
> include/linux/dma/k3-udma-glue.h | 4 ++
> 2 files changed, 79 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/dma/ti/k3-udma-glue.c b/drivers/dma/ti/k3-udma-glue.c
> index eff1ae3d3efe..ea5119a5e8eb 100644
> --- a/drivers/dma/ti/k3-udma-glue.c
> +++ b/drivers/dma/ti/k3-udma-glue.c
> @@ -274,29 +274,13 @@ static int k3_udma_glue_cfg_tx_chn(struct k3_udma_glue_tx_channel *tx_chn)
> return tisci_rm->tisci_udmap_ops->tx_ch_cfg(tisci_rm->tisci, &req);
> }
>
> -struct k3_udma_glue_tx_channel *k3_udma_glue_request_tx_chn(struct device *dev,
> - const char *name, struct k3_udma_glue_tx_channel_cfg *cfg)
> +static int
> +k3_udma_glue_request_tx_chn_common(struct device *dev,
> + struct k3_udma_glue_tx_channel *tx_chn,
> + struct k3_udma_glue_tx_channel_cfg *cfg)
> {
> - struct k3_udma_glue_tx_channel *tx_chn;
> int ret;
>
> - tx_chn = devm_kzalloc(dev, sizeof(*tx_chn), GFP_KERNEL);
> - if (!tx_chn)
> - return ERR_PTR(-ENOMEM);
> -
> - tx_chn->common.dev = dev;
> - tx_chn->common.swdata_size = cfg->swdata_size;
> - tx_chn->tx_pause_on_err = cfg->tx_pause_on_err;
> - tx_chn->tx_filt_einfo = cfg->tx_filt_einfo;
> - tx_chn->tx_filt_pswords = cfg->tx_filt_pswords;
> - tx_chn->tx_supr_tdpkt = cfg->tx_supr_tdpkt;
> -
> - /* parse of udmap channel */
> - ret = of_k3_udma_glue_parse_chn(dev->of_node, name,
> - &tx_chn->common, true);
> - if (ret)
> - goto err;
> -
> tx_chn->common.hdesc_size = cppi5_hdesc_calc_size(tx_chn->common.epib,
> tx_chn->common.psdata_size,
> tx_chn->common.swdata_size);
> @@ -312,7 +296,7 @@ struct k3_udma_glue_tx_channel *k3_udma_glue_request_tx_chn(struct device *dev,
> if (IS_ERR(tx_chn->udma_tchanx)) {
> ret = PTR_ERR(tx_chn->udma_tchanx);
> dev_err(dev, "UDMAX tchanx get err %d\n", ret);
> - goto err;
> + return ret;
> }
> tx_chn->udma_tchan_id = xudma_tchan_get_id(tx_chn->udma_tchanx);
>
> @@ -325,7 +309,7 @@ struct k3_udma_glue_tx_channel *k3_udma_glue_request_tx_chn(struct device *dev,
> dev_err(dev, "Channel Device registration failed %d\n", ret);
> put_device(&tx_chn->common.chan_dev);
> tx_chn->common.chan_dev.parent = NULL;
> - goto err;
> + return ret;
> }
>
> if (xudma_is_pktdma(tx_chn->common.udmax)) {
> @@ -349,7 +333,7 @@ struct k3_udma_glue_tx_channel *k3_udma_glue_request_tx_chn(struct device *dev,
> &tx_chn->ringtxcq);
> if (ret) {
> dev_err(dev, "Failed to get TX/TXCQ rings %d\n", ret);
> - goto err;
> + return ret;
> }
>
> /* Set the dma_dev for the rings to be configured */
> @@ -365,13 +349,13 @@ struct k3_udma_glue_tx_channel *k3_udma_glue_request_tx_chn(struct device *dev,
> ret = k3_ringacc_ring_cfg(tx_chn->ringtx, &cfg->tx_cfg);
> if (ret) {
> dev_err(dev, "Failed to cfg ringtx %d\n", ret);
> - goto err;
> + return ret;
> }
>
> ret = k3_ringacc_ring_cfg(tx_chn->ringtxcq, &cfg->txcq_cfg);
> if (ret) {
> dev_err(dev, "Failed to cfg ringtx %d\n", ret);
> - goto err;
> + return ret;
> }
>
> /* request and cfg psi-l */
> @@ -382,11 +366,42 @@ struct k3_udma_glue_tx_channel *k3_udma_glue_request_tx_chn(struct device *dev,
> ret = k3_udma_glue_cfg_tx_chn(tx_chn);
> if (ret) {
> dev_err(dev, "Failed to cfg tchan %d\n", ret);
> - goto err;
> + return ret;
> }
>
> k3_udma_glue_dump_tx_chn(tx_chn);
>
> + return 0;
> +}
> +
> +struct k3_udma_glue_tx_channel *
> +k3_udma_glue_request_tx_chn(struct device *dev, const char *name,
> + struct k3_udma_glue_tx_channel_cfg *cfg)
> +{
> + struct k3_udma_glue_tx_channel *tx_chn;
> + int ret;
> +
> + tx_chn = devm_kzalloc(dev, sizeof(*tx_chn), GFP_KERNEL);
> + if (!tx_chn)
> + return ERR_PTR(-ENOMEM);
> +
> + tx_chn->common.dev = dev;
> + tx_chn->common.swdata_size = cfg->swdata_size;
> + tx_chn->tx_pause_on_err = cfg->tx_pause_on_err;
> + tx_chn->tx_filt_einfo = cfg->tx_filt_einfo;
> + tx_chn->tx_filt_pswords = cfg->tx_filt_pswords;
> + tx_chn->tx_supr_tdpkt = cfg->tx_supr_tdpkt;
> +
> + /* parse of udmap channel */
> + ret = of_k3_udma_glue_parse_chn(dev->of_node, name,
> + &tx_chn->common, true);
> + if (ret)
> + goto err;
> +
> + ret = k3_udma_glue_request_tx_chn_common(dev, tx_chn, cfg);
> + if (ret)
> + goto err;
> +
> return tx_chn;
>
> err:
> @@ -395,6 +410,40 @@ struct k3_udma_glue_tx_channel *k3_udma_glue_request_tx_chn(struct device *dev,
> }
> EXPORT_SYMBOL_GPL(k3_udma_glue_request_tx_chn);
>
> +struct k3_udma_glue_tx_channel *
> +k3_udma_glue_request_tx_chn_by_id(struct device *dev, struct k3_udma_glue_tx_channel_cfg *cfg,
> + struct device_node *udmax_np, u32 thread_id)
udmax_np is not dev->of_node ?
> +{
> + struct k3_udma_glue_tx_channel *tx_chn;
> + int ret;
> +
> + tx_chn = devm_kzalloc(dev, sizeof(*tx_chn), GFP_KERNEL);
> + if (!tx_chn)
> + return ERR_PTR(-ENOMEM);
> +
> + tx_chn->common.dev = dev;
> + tx_chn->common.swdata_size = cfg->swdata_size;
> + tx_chn->tx_pause_on_err = cfg->tx_pause_on_err;
> + tx_chn->tx_filt_einfo = cfg->tx_filt_einfo;
> + tx_chn->tx_filt_pswords = cfg->tx_filt_pswords;
> + tx_chn->tx_supr_tdpkt = cfg->tx_supr_tdpkt;
> +
> + ret = of_k3_udma_glue_parse_chn_by_id(udmax_np, &tx_chn->common, true, thread_id);
> + if (ret)
> + goto err;
> +
> + ret = k3_udma_glue_request_tx_chn_common(dev, tx_chn, cfg);
> + if (ret)
> + goto err;
> +
> + return tx_chn;
> +
> +err:
> + k3_udma_glue_release_tx_chn(tx_chn);
> + return ERR_PTR(ret);
> +}
> +EXPORT_SYMBOL_GPL(k3_udma_glue_request_tx_chn_by_id);
> +
> void k3_udma_glue_release_tx_chn(struct k3_udma_glue_tx_channel *tx_chn)
> {
> if (tx_chn->psil_paired) {
> diff --git a/include/linux/dma/k3-udma-glue.h b/include/linux/dma/k3-udma-glue.h
> index e443be4d3b4b..6205d84430ca 100644
> --- a/include/linux/dma/k3-udma-glue.h
> +++ b/include/linux/dma/k3-udma-glue.h
> @@ -26,6 +26,10 @@ struct k3_udma_glue_tx_channel;
> struct k3_udma_glue_tx_channel *k3_udma_glue_request_tx_chn(struct device *dev,
> const char *name, struct k3_udma_glue_tx_channel_cfg *cfg);
>
> +struct k3_udma_glue_tx_channel *
> +k3_udma_glue_request_tx_chn_by_id(struct device *dev, struct k3_udma_glue_tx_channel_cfg *cfg,
I know it is going to be longer, but can the function be named more
precisely?
k3_udma_glue_request_tx_chn_by_thread_id
For TX/RX: a channel is always for one thread, right?
Probably:
k3_udma_glue_request_tx_chn_for_thread_id()
?
Other then this the series looks OK.
> + struct device_node *udmax_np, u32 thread_id);
> +
> void k3_udma_glue_release_tx_chn(struct k3_udma_glue_tx_channel *tx_chn);
> int k3_udma_glue_push_tx_chn(struct k3_udma_glue_tx_channel *tx_chn,
> struct cppi5_host_desc_t *desc_tx,
--
Péter
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