206 lines
6.4 KiB
C
Executable file
206 lines
6.4 KiB
C
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Public definitions for the CAAM/QI (Queue Interface) backend.
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*
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* Copyright 2013-2016 Freescale Semiconductor, Inc.
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* Copyright 2016-2017 NXP
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*/
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#ifndef __QI_H__
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#define __QI_H__
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#include <soc/fsl/qman.h>
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#include "compat.h"
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#include "desc.h"
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#include "desc_constr.h"
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/*
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* CAAM hardware constructs a job descriptor which points to a shared descriptor
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* (as pointed by context_a of to-CAAM FQ).
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* When the job descriptor is executed by DECO, the whole job descriptor
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* together with shared descriptor gets loaded in DECO buffer, which is
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* 64 words (each 32-bit) long.
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*
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* The job descriptor constructed by CAAM hardware has the following layout:
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*
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* HEADER (1 word)
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* Shdesc ptr (1 or 2 words)
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* SEQ_OUT_PTR (1 word)
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* Out ptr (1 or 2 words)
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* Out length (1 word)
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* SEQ_IN_PTR (1 word)
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* In ptr (1 or 2 words)
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* In length (1 word)
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*
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* The shdesc ptr is used to fetch shared descriptor contents into DECO buffer.
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*
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* Apart from shdesc contents, the total number of words that get loaded in DECO
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* buffer are '8' or '11'. The remaining words in DECO buffer can be used for
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* storing shared descriptor.
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*/
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#define MAX_SDLEN ((CAAM_DESC_BYTES_MAX - DESC_JOB_IO_LEN) / CAAM_CMD_SZ)
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/* Length of a single buffer in the QI driver memory cache */
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#define CAAM_QI_MEMCACHE_SIZE 768
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extern bool caam_congested __read_mostly;
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/*
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* This is the request structure the driver application should fill while
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* submitting a job to driver.
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*/
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struct caam_drv_req;
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/*
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* caam_qi_cbk - application's callback function invoked by the driver when the
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* request has been successfully processed.
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* @drv_req: original request that was submitted
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* @status: completion status of request (0 - success, non-zero - error code)
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*/
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typedef void (*caam_qi_cbk)(struct caam_drv_req *drv_req, u32 status);
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enum optype {
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ENCRYPT,
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DECRYPT,
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GIVENCRYPT,
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NUM_OP
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};
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/**
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* caam_drv_ctx - CAAM/QI backend driver context
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*
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* The jobs are processed by the driver against a driver context.
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* With every cryptographic context, a driver context is attached.
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* The driver context contains data for private use by driver.
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* For the applications, this is an opaque structure.
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*
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* @prehdr: preheader placed before shrd desc
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* @sh_desc: shared descriptor
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* @context_a: shared descriptor dma address
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* @req_fq: to-CAAM request frame queue
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* @rsp_fq: from-CAAM response frame queue
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* @cpu: cpu on which to receive CAAM response
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* @op_type: operation type
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* @qidev: device pointer for CAAM/QI backend
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*/
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struct caam_drv_ctx {
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u32 prehdr[2];
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u32 sh_desc[MAX_SDLEN];
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dma_addr_t context_a;
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struct qman_fq *req_fq;
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struct qman_fq *rsp_fq;
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int cpu;
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enum optype op_type;
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struct device *qidev;
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} ____cacheline_aligned;
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/**
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* caam_drv_req - The request structure the driver application should fill while
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* submitting a job to driver.
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* @fd_sgt: QMan S/G pointing to output (fd_sgt[0]) and input (fd_sgt[1])
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* buffers.
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* @cbk: callback function to invoke when job is completed
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* @app_ctx: arbitrary context attached with request by the application
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*
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* The fields mentioned below should not be used by application.
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* These are for private use by driver.
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*
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* @hdr__: linked list header to maintain list of outstanding requests to CAAM
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* @hwaddr: DMA address for the S/G table.
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*/
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struct caam_drv_req {
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struct qm_sg_entry fd_sgt[2];
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struct caam_drv_ctx *drv_ctx;
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caam_qi_cbk cbk;
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void *app_ctx;
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} ____cacheline_aligned;
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/**
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* caam_drv_ctx_init - Initialise a CAAM/QI driver context
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*
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* A CAAM/QI driver context must be attached with each cryptographic context.
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* This function allocates memory for CAAM/QI context and returns a handle to
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* the application. This handle must be submitted along with each enqueue
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* request to the driver by the application.
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*
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* @cpu: CPU where the application prefers to the driver to receive CAAM
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* responses. The request completion callback would be issued from this
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* CPU.
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* @sh_desc: shared descriptor pointer to be attached with CAAM/QI driver
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* context.
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*
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* Returns a driver context on success or negative error code on failure.
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*/
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struct caam_drv_ctx *caam_drv_ctx_init(struct device *qidev, int *cpu,
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u32 *sh_desc);
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/**
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* caam_qi_enqueue - Submit a request to QI backend driver.
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*
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* The request structure must be properly filled as described above.
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*
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* @qidev: device pointer for QI backend
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* @req: CAAM QI request structure
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*
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* Returns 0 on success or negative error code on failure.
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*/
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int caam_qi_enqueue(struct device *qidev, struct caam_drv_req *req);
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/**
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* caam_drv_ctx_busy - Check if there are too many jobs pending with CAAM
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* or too many CAAM responses are pending to be processed.
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* @drv_ctx: driver context for which job is to be submitted
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*
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* Returns caam congestion status 'true/false'
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*/
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bool caam_drv_ctx_busy(struct caam_drv_ctx *drv_ctx);
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/**
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* caam_drv_ctx_update - Update QI driver context
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*
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* Invoked when shared descriptor is required to be change in driver context.
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*
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* @drv_ctx: driver context to be updated
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* @sh_desc: new shared descriptor pointer to be updated in QI driver context
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*
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* Returns 0 on success or negative error code on failure.
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*/
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int caam_drv_ctx_update(struct caam_drv_ctx *drv_ctx, u32 *sh_desc);
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/**
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* caam_drv_ctx_rel - Release a QI driver context
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* @drv_ctx: context to be released
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*/
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void caam_drv_ctx_rel(struct caam_drv_ctx *drv_ctx);
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int caam_qi_init(struct platform_device *pdev);
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int caam_qi_shutdown(struct device *dev);
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/**
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* qi_cache_alloc - Allocate buffers from CAAM-QI cache
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*
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* Invoked when a user of the CAAM-QI (i.e. caamalg-qi) needs data which has
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* to be allocated on the hotpath. Instead of using malloc, one can use the
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* services of the CAAM QI memory cache (backed by kmem_cache). The buffers
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* will have a size of 256B, which is sufficient for hosting 16 SG entries.
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*
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* @flags: flags that would be used for the equivalent malloc(..) call
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*
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* Returns a pointer to a retrieved buffer on success or NULL on failure.
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*/
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void *qi_cache_alloc(gfp_t flags);
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/**
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* qi_cache_free - Frees buffers allocated from CAAM-QI cache
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*
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* Invoked when a user of the CAAM-QI (i.e. caamalg-qi) no longer needs
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* the buffer previously allocated by a qi_cache_alloc call.
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* No checking is being done, the call is a passthrough call to
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* kmem_cache_free(...)
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*
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* @obj: object previously allocated using qi_cache_alloc()
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*/
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void qi_cache_free(void *obj);
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#endif /* __QI_H__ */
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