linux-kernel - Re: [PATCH v11 14/14] dmaengine: idxd: Add support for device/wq defaults

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Message-Id: <20231205092139.3682047-1-rex.zhang@intel.com>
Date:   Tue,  5 Dec 2023 17:21:39 +0800
From:   Rex Zhang <rex.zhang@...el.com>
To:     tom.zanussi@...ux.intel.com
Cc:     dave.jiang@...el.com, davem@...emloft.net,
        dmaengine@...r.kernel.org, fenghua.yu@...el.com,
        giovanni.cabiddu@...el.com, herbert@...dor.apana.org.au,
        james.guilford@...el.com, kanchana.p.sridhar@...el.com,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        pavel@....cz, tony.luck@...el.com, vinodh.gopal@...el.com,
        vkoul@...nel.org, wajdi.k.feghali@...el.com
Subject: Re: [PATCH v11 14/14] dmaengine: idxd: Add support for device/wq defaults

Hi Tom,

On 2023-12-01 at 14:10:35 -0600, Tom Zanussi wrote:

[snip]

> +int idxd_load_iaa_device_defaults(struct idxd_device *idxd)
> +{
> +	struct idxd_engine *engine;
> +	struct idxd_group *group;
> +	struct idxd_wq *wq;
> +
> +	if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
> +		return 0;
In the virtualization case, it is not configurable in guest OS,
then the default work queue will not be enabled. Is it expected?
> +
> +	wq = idxd->wqs[0];
> +
> +	if (wq->state != IDXD_WQ_DISABLED)
> +		return -EPERM;
> +
> +	/* set mode to "dedicated" */
> +	set_bit(WQ_FLAG_DEDICATED, &wq->flags);
> +	wq->threshold = 0;
> +
> +	/* only setting up 1 wq, so give it all the wq space */
> +	wq->size = idxd->max_wq_size;
> +
> +	/* set priority to 10 */
> +	wq->priority = 10;
> +
> +	/* set type to "kernel" */
> +	wq->type = IDXD_WQT_KERNEL;
> +
> +	/* set wq group to 0 */
> +	group = idxd->groups[0];
> +	wq->group = group;
> +	group->num_wqs++;
> +
> +	/* set name to "iaa_crypto" */
> +	memset(wq->name, 0, WQ_NAME_SIZE + 1);
> +	strscpy(wq->name, "iaa_crypto", WQ_NAME_SIZE + 1);
> +
> +	/* set driver_name to "crypto" */
> +	memset(wq->driver_name, 0, DRIVER_NAME_SIZE + 1);
> +	strscpy(wq->driver_name, "crypto", DRIVER_NAME_SIZE + 1);
> +
> +	engine = idxd->engines[0];
> +
> +	/* set engine group to 0 */
> +	engine->group = idxd->groups[0];
> +	engine->group->num_engines++;
> +
> +	return 0;
> +}
> diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
> index 62ea21b25906..47de3f93ff1e 100644
> --- a/drivers/dma/idxd/idxd.h
> +++ b/drivers/dma/idxd/idxd.h
> @@ -277,6 +277,8 @@ struct idxd_dma_dev {
>  	struct dma_device dma;
>  };
>  
> +typedef int (*load_device_defaults_fn_t) (struct idxd_device *idxd);
> +
>  struct idxd_driver_data {
>  	const char *name_prefix;
>  	enum idxd_type type;
> @@ -286,6 +288,7 @@ struct idxd_driver_data {
>  	int evl_cr_off;
>  	int cr_status_off;
>  	int cr_result_off;
> +	load_device_defaults_fn_t load_device_defaults;
>  };
>  
>  struct idxd_evl {
> @@ -730,6 +733,7 @@ void idxd_unregister_devices(struct idxd_device *idxd);
>  void idxd_wqs_quiesce(struct idxd_device *idxd);
>  bool idxd_queue_int_handle_resubmit(struct idxd_desc *desc);
>  void multi_u64_to_bmap(unsigned long *bmap, u64 *val, int count);
> +int idxd_load_iaa_device_defaults(struct idxd_device *idxd);
>  
>  /* device interrupt control */
>  irqreturn_t idxd_misc_thread(int vec, void *data);
> diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
> index 0eb1c827a215..14df1f1347a8 100644
> --- a/drivers/dma/idxd/init.c
> +++ b/drivers/dma/idxd/init.c
> @@ -59,6 +59,7 @@ static struct idxd_driver_data idxd_driver_data[] = {
>  		.evl_cr_off = offsetof(struct iax_evl_entry, cr),
>  		.cr_status_off = offsetof(struct iax_completion_record, status),
>  		.cr_result_off = offsetof(struct iax_completion_record, error_code),
> +		.load_device_defaults = idxd_load_iaa_device_defaults,
>  	},
>  };
>  
> @@ -745,6 +746,12 @@ static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  		goto err;
>  	}
>  
> +	if (data->load_device_defaults) {
> +		rc = data->load_device_defaults(idxd);
> +		if (rc)
> +			dev_warn(dev, "IDXD loading device defaults failed\n");
> +	}
> +
>  	rc = idxd_register_devices(idxd);
>  	if (rc) {
>  		dev_err(dev, "IDXD sysfs setup failed\n");

Thanks,
Rex Zhang
> -- 
> 2.34.1
>