1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Public definitions for the CAAM/QI (Queue Interface) backend. 4 * 5 * Copyright 2013-2016 Freescale Semiconductor, Inc. 6 * Copyright 2016-2017 NXP 7 */ 8 9 #ifndef __QI_H__ 10 #define __QI_H__ 11 12 #include <soc/fsl/qman.h> 13 #include "compat.h" 14 #include "desc.h" 15 #include "desc_constr.h" 16 17 /* Length of a single buffer in the QI driver memory cache */ 18 #define CAAM_QI_MEMCACHE_SIZE 768 19 20 extern bool caam_congested __read_mostly; 21 22 /* 23 * This is the request structure the driver application should fill while 24 * submitting a job to driver. 25 */ 26 struct caam_drv_req; 27 28 /* 29 * caam_qi_cbk - application's callback function invoked by the driver when the 30 * request has been successfully processed. 31 * @drv_req: original request that was submitted 32 * @status: completion status of request (0 - success, non-zero - error code) 33 */ 34 typedef void (*caam_qi_cbk)(struct caam_drv_req *drv_req, u32 status); 35 36 enum optype { 37 ENCRYPT, 38 DECRYPT, 39 NUM_OP 40 }; 41 42 /** 43 * caam_drv_ctx - CAAM/QI backend driver context 44 * 45 * The jobs are processed by the driver against a driver context. 46 * With every cryptographic context, a driver context is attached. 47 * The driver context contains data for private use by driver. 48 * For the applications, this is an opaque structure. 49 * 50 * @prehdr: preheader placed before shrd desc 51 * @sh_desc: shared descriptor 52 * @context_a: shared descriptor dma address 53 * @req_fq: to-CAAM request frame queue 54 * @rsp_fq: from-CAAM response frame queue 55 * @cpu: cpu on which to receive CAAM response 56 * @op_type: operation type 57 * @qidev: device pointer for CAAM/QI backend 58 */ 59 struct caam_drv_ctx { 60 u32 prehdr[2]; 61 u32 sh_desc[MAX_SDLEN]; 62 dma_addr_t context_a; 63 struct qman_fq *req_fq; 64 struct qman_fq *rsp_fq; 65 int cpu; 66 enum optype op_type; 67 struct device *qidev; 68 } ____cacheline_aligned; 69 70 /** 71 * caam_drv_req - The request structure the driver application should fill while 72 * submitting a job to driver. 73 * @fd_sgt: QMan S/G pointing to output (fd_sgt[0]) and input (fd_sgt[1]) 74 * buffers. 75 * @cbk: callback function to invoke when job is completed 76 * @app_ctx: arbitrary context attached with request by the application 77 * 78 * The fields mentioned below should not be used by application. 79 * These are for private use by driver. 80 * 81 * @hdr__: linked list header to maintain list of outstanding requests to CAAM 82 * @hwaddr: DMA address for the S/G table. 83 */ 84 struct caam_drv_req { 85 struct qm_sg_entry fd_sgt[2]; 86 struct caam_drv_ctx *drv_ctx; 87 caam_qi_cbk cbk; 88 void *app_ctx; 89 } ____cacheline_aligned; 90 91 /** 92 * caam_drv_ctx_init - Initialise a CAAM/QI driver context 93 * 94 * A CAAM/QI driver context must be attached with each cryptographic context. 95 * This function allocates memory for CAAM/QI context and returns a handle to 96 * the application. This handle must be submitted along with each enqueue 97 * request to the driver by the application. 98 * 99 * @cpu: CPU where the application prefers to the driver to receive CAAM 100 * responses. The request completion callback would be issued from this 101 * CPU. 102 * @sh_desc: shared descriptor pointer to be attached with CAAM/QI driver 103 * context. 104 * 105 * Returns a driver context on success or negative error code on failure. 106 */ 107 struct caam_drv_ctx *caam_drv_ctx_init(struct device *qidev, int *cpu, 108 u32 *sh_desc); 109 110 /** 111 * caam_qi_enqueue - Submit a request to QI backend driver. 112 * 113 * The request structure must be properly filled as described above. 114 * 115 * @qidev: device pointer for QI backend 116 * @req: CAAM QI request structure 117 * 118 * Returns 0 on success or negative error code on failure. 119 */ 120 int caam_qi_enqueue(struct device *qidev, struct caam_drv_req *req); 121 122 /** 123 * caam_drv_ctx_busy - Check if there are too many jobs pending with CAAM 124 * or too many CAAM responses are pending to be processed. 125 * @drv_ctx: driver context for which job is to be submitted 126 * 127 * Returns caam congestion status 'true/false' 128 */ 129 bool caam_drv_ctx_busy(struct caam_drv_ctx *drv_ctx); 130 131 /** 132 * caam_drv_ctx_update - Update QI driver context 133 * 134 * Invoked when shared descriptor is required to be change in driver context. 135 * 136 * @drv_ctx: driver context to be updated 137 * @sh_desc: new shared descriptor pointer to be updated in QI driver context 138 * 139 * Returns 0 on success or negative error code on failure. 140 */ 141 int caam_drv_ctx_update(struct caam_drv_ctx *drv_ctx, u32 *sh_desc); 142 143 /** 144 * caam_drv_ctx_rel - Release a QI driver context 145 * @drv_ctx: context to be released 146 */ 147 void caam_drv_ctx_rel(struct caam_drv_ctx *drv_ctx); 148 149 int caam_qi_init(struct platform_device *pdev); 150 151 /** 152 * qi_cache_alloc - Allocate buffers from CAAM-QI cache 153 * 154 * Invoked when a user of the CAAM-QI (i.e. caamalg-qi) needs data which has 155 * to be allocated on the hotpath. Instead of using malloc, one can use the 156 * services of the CAAM QI memory cache (backed by kmem_cache). The buffers 157 * will have a size of 256B, which is sufficient for hosting 16 SG entries. 158 * 159 * @flags: flags that would be used for the equivalent malloc(..) call 160 * 161 * Returns a pointer to a retrieved buffer on success or NULL on failure. 162 */ 163 void *qi_cache_alloc(gfp_t flags); 164 165 /** 166 * qi_cache_free - Frees buffers allocated from CAAM-QI cache 167 * 168 * Invoked when a user of the CAAM-QI (i.e. caamalg-qi) no longer needs 169 * the buffer previously allocated by a qi_cache_alloc call. 170 * No checking is being done, the call is a passthrough call to 171 * kmem_cache_free(...) 172 * 173 * @obj: object previously allocated using qi_cache_alloc() 174 */ 175 void qi_cache_free(void *obj); 176 177 #endif /* __QI_H__ */ 178