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Commit 67c2315d authored by Horia Geantă's avatar Horia Geantă Committed by Herbert Xu
Browse files

crypto: caam - add Queue Interface (QI) backend support 



CAAM engine supports two interfaces for crypto job submission:
-job ring interface - already existing caam/jr driver
-Queue Interface (QI) - caam/qi driver added in current patch

QI is present in CAAM engines found on DPAA platforms.
QI gets its I/O (frame descriptors) from QMan (Queue Manager) queues.

This patch adds a platform device for accessing CAAM's queue interface.
The requests are submitted to CAAM using one frame queue per
cryptographic context. Each crypto context has one shared descriptor.
This shared descriptor is attached to frame queue associated with
corresponding driver context using context_a.

The driver hides the mechanics of FQ creation, initialisation from its
applications. Each cryptographic context needs to be associated with
driver context which houses the FQ to be used to transport the job to
CAAM. The driver provides API for:
(a) Context creation
(b) Job submission
(c) Context deletion
(d) Congestion indication - whether path to/from CAAM is congested

The driver supports affining its context to a particular CPU.
This means that any responses from CAAM for the context in question
would arrive at the given CPU. This helps in implementing one CPU
per packet round trip in IPsec application.

The driver processes CAAM responses under NAPI contexts.
NAPI contexts are instantiated only on cores with affined portals since
only cores having their own portal can receive responses from DQRR.

The responses from CAAM for all cryptographic contexts ride on a fixed
set of FQs. We use one response FQ per portal owning core. The response
FQ is configured in each core's and thus portal's dedicated channel.
This gives the flexibility to direct CAAM's responses for a crypto
context on a given core.

Signed-off-by: default avatarVakul Garg <vakul.garg@nxp.com>
Signed-off-by: default avatarAlex Porosanu <alexandru.porosanu@nxp.com>
Signed-off-by: default avatarHoria Geantă <horia.geanta@nxp.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent cd373691

drivers/crypto/caam/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -16,3 +16,7 @@ obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_PKC_API) += caam_pkc.o 
caam-objs := ctrl.o

caam_jr-objs := jr.o key_gen.o error.o

caam_pkc-y := caampkc.o pkc_desc.o

ifneq ($(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI),)

	ccflags-y += -DCONFIG_CAAM_QI

	caam-objs += qi.o

endif

drivers/crypto/caam/ctrl.c

+30 −28
Original line number Diff line number Diff line
@@ -18,6 +18,10 @@ 
bool caam_little_end;

EXPORT_SYMBOL(caam_little_end);



#ifdef CONFIG_CAAM_QI

#include "qi.h"

#endif



/*

 * i.MX targets tend to have clock control subsystems that can

 * enable/disable clocking to our device.
@@ -311,6 +315,11 @@ static int caam_remove(struct platform_device *pdev) 
	for (ring = 0; ring < ctrlpriv->total_jobrs; ring++)

		of_device_unregister(ctrlpriv->jrpdev[ring]);



#ifdef CONFIG_CAAM_QI

	if (ctrlpriv->qidev)

		caam_qi_shutdown(ctrlpriv->qidev);

#endif



	/* De-initialize RNG state handles initialized by this driver. */

	if (ctrlpriv->rng4_sh_init)

		deinstantiate_rng(ctrldev, ctrlpriv->rng4_sh_init);
@@ -401,23 +410,6 @@ int caam_get_era(void) 
}

EXPORT_SYMBOL(caam_get_era);



#ifdef CONFIG_DEBUG_FS

static int caam_debugfs_u64_get(void *data, u64 *val)

{

	*val = caam64_to_cpu(*(u64 *)data);

	return 0;

}



static int caam_debugfs_u32_get(void *data, u64 *val)

{

	*val = caam32_to_cpu(*(u32 *)data);

	return 0;

}



DEFINE_SIMPLE_ATTRIBUTE(caam_fops_u32_ro, caam_debugfs_u32_get, NULL, "%llu\n");

DEFINE_SIMPLE_ATTRIBUTE(caam_fops_u64_ro, caam_debugfs_u64_get, NULL, "%llu\n");

#endif



/* Probe routine for CAAM top (controller) level */

static int caam_probe(struct platform_device *pdev)

{
@@ -615,6 +607,17 @@ static int caam_probe(struct platform_device *pdev) 
		goto iounmap_ctrl;

	}



#ifdef CONFIG_DEBUG_FS

	/*

	 * FIXME: needs better naming distinction, as some amalgamation of

	 * "caam" and nprop->full_name. The OF name isn't distinctive,

	 * but does separate instances

	 */

	perfmon = (struct caam_perfmon __force *)&ctrl->perfmon;



	ctrlpriv->dfs_root = debugfs_create_dir(dev_name(dev), NULL);

	ctrlpriv->ctl = debugfs_create_dir("ctl", ctrlpriv->dfs_root);

#endif

	ring = 0;

	ridx = 0;

	ctrlpriv->total_jobrs = 0;
@@ -650,6 +653,13 @@ static int caam_probe(struct platform_device *pdev) 
			       );

		/* This is all that's required to physically enable QI */

		wr_reg32(&ctrlpriv->qi->qi_control_lo, QICTL_DQEN);



		/* If QMAN driver is present, init CAAM-QI backend */

#ifdef CONFIG_CAAM_QI

		ret = caam_qi_init(pdev);

		if (ret)

			dev_err(dev, "caam qi i/f init failed: %d\n", ret);

#endif

	}



	/* If no QI and no rings specified, quit and go home */
@@ -737,17 +747,6 @@ static int caam_probe(struct platform_device *pdev) 
		 ctrlpriv->total_jobrs, ctrlpriv->qi_present);



#ifdef CONFIG_DEBUG_FS

	/*

	 * FIXME: needs better naming distinction, as some amalgamation of

	 * "caam" and nprop->full_name. The OF name isn't distinctive,

	 * but does separate instances

	 */

	perfmon = (struct caam_perfmon __force *)&ctrl->perfmon;



	ctrlpriv->dfs_root = debugfs_create_dir(dev_name(dev), NULL);

	ctrlpriv->ctl = debugfs_create_dir("ctl", ctrlpriv->dfs_root);



	/* Controller-level - performance monitor counters */



	ctrlpriv->ctl_rq_dequeued =

		debugfs_create_file("rq_dequeued",
@@ -830,6 +829,9 @@ static int caam_probe(struct platform_device *pdev) 
	return 0;



caam_remove:

#ifdef CONFIG_DEBUG_FS

	debugfs_remove_recursive(ctrlpriv->dfs_root);

#endif

	caam_remove(pdev);

	return ret;

drivers/crypto/caam/intern.h

+24 −0
Original line number Diff line number Diff line
@@ -67,6 +67,9 @@ struct caam_drv_private { 


	struct device *dev;

	struct platform_device **jrpdev; /* Alloc'ed array per sub-device */

#ifdef CONFIG_CAAM_QI

	struct device *qidev;

#endif

	struct platform_device *pdev;



	/* Physical-presence section */
@@ -110,9 +113,30 @@ struct caam_drv_private { 


	struct debugfs_blob_wrapper ctl_kek_wrap, ctl_tkek_wrap, ctl_tdsk_wrap;

	struct dentry *ctl_kek, *ctl_tkek, *ctl_tdsk;

#ifdef CONFIG_CAAM_QI

	struct dentry *qi_congested;

#endif

#endif

};



void caam_jr_algapi_init(struct device *dev);

void caam_jr_algapi_remove(struct device *dev);



#ifdef CONFIG_DEBUG_FS

static int caam_debugfs_u64_get(void *data, u64 *val)

{

	*val = caam64_to_cpu(*(u64 *)data);

	return 0;

}



static int caam_debugfs_u32_get(void *data, u64 *val)

{

	*val = caam32_to_cpu(*(u32 *)data);

	return 0;

}



DEFINE_SIMPLE_ATTRIBUTE(caam_fops_u32_ro, caam_debugfs_u32_get, NULL, "%llu\n");

DEFINE_SIMPLE_ATTRIBUTE(caam_fops_u64_ro, caam_debugfs_u64_get, NULL, "%llu\n");

#endif



#endif /* INTERN_H */

drivers/crypto/caam/qi.c

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drivers/crypto/caam/qi.h

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