From c4a89279086e9c98eba659d7665b1732e0d5e3e3 Mon Sep 17 00:00:00 2001 From: "Hook, Gary" Date: Tue, 9 Jul 2019 15:07:22 +0000 Subject: [PATCH] crypto: ccp - Add a module parameter to specify a queue count Add a module parameter to limit the number of queues per CCP. The default value (nqueues=0) is to set up every available queue on each device. The count of queues starts from the first one found on the device (which varies based on the device ID). Signed-off-by: Gary R Hook Signed-off-by: Herbert Xu --- drivers/crypto/ccp/ccp-dev-v3.c | 2 +- drivers/crypto/ccp/ccp-dev-v5.c | 7 ++----- drivers/crypto/ccp/ccp-dev.c | 11 +++++++++++ drivers/crypto/ccp/ccp-dev.h | 1 + 4 files changed, 15 insertions(+), 6 deletions(-) diff --git a/drivers/crypto/ccp/ccp-dev-v3.c b/drivers/crypto/ccp/ccp-dev-v3.c index 2b7d47ed5c74..4005d438dff9 100644 --- a/drivers/crypto/ccp/ccp-dev-v3.c +++ b/drivers/crypto/ccp/ccp-dev-v3.c @@ -379,7 +379,7 @@ static int ccp_init(struct ccp_device *ccp) /* Find available queues */ ccp->qim = 0; qmr = ioread32(ccp->io_regs + Q_MASK_REG); - for (i = 0; i < MAX_HW_QUEUES; i++) { + for (i = 0; (i < MAX_HW_QUEUES) && (ccp->cmd_q_count < ccp->max_q_count); i++) { if (!(qmr & (1 << i))) continue; diff --git a/drivers/crypto/ccp/ccp-dev-v5.c b/drivers/crypto/ccp/ccp-dev-v5.c index 35b3d866726d..f146b51a23a5 100644 --- a/drivers/crypto/ccp/ccp-dev-v5.c +++ b/drivers/crypto/ccp/ccp-dev-v5.c @@ -2,16 +2,14 @@ /* * AMD Cryptographic Coprocessor (CCP) driver * - * Copyright (C) 2016,2017 Advanced Micro Devices, Inc. + * Copyright (C) 2016,2019 Advanced Micro Devices, Inc. * * Author: Gary R Hook */ -#include #include #include #include -#include #include #include #include @@ -792,8 +790,7 @@ static int ccp5_init(struct ccp_device *ccp) /* Find available queues */ qmr = ioread32(ccp->io_regs + Q_MASK_REG); - for (i = 0; i < MAX_HW_QUEUES; i++) { - + for (i = 0; (i < MAX_HW_QUEUES) && (ccp->cmd_q_count < ccp->max_q_count); i++) { if (!(qmr & (1 << i))) continue; diff --git a/drivers/crypto/ccp/ccp-dev.c b/drivers/crypto/ccp/ccp-dev.c index f79eede71c62..352059d0c572 100644 --- a/drivers/crypto/ccp/ccp-dev.c +++ b/drivers/crypto/ccp/ccp-dev.c @@ -8,6 +8,7 @@ * Author: Gary R Hook */ +#include #include #include #include @@ -26,6 +27,11 @@ #include "ccp-dev.h" +/* Limit CCP use to a specifed number of queues per device */ +static unsigned int nqueues = 0; +module_param(nqueues, uint, 0444); +MODULE_PARM_DESC(nqueues, "Number of queues per CCP (minimum 1; default: all available)"); + struct ccp_tasklet_data { struct completion completion; struct ccp_cmd *cmd; @@ -592,6 +598,11 @@ int ccp_dev_init(struct sp_device *sp) goto e_err; sp->ccp_data = ccp; + if (!nqueues || (nqueues > MAX_HW_QUEUES)) + ccp->max_q_count = MAX_HW_QUEUES; + else + ccp->max_q_count = nqueues; + ccp->vdata = (struct ccp_vdata *)sp->dev_vdata->ccp_vdata; if (!ccp->vdata || !ccp->vdata->version) { ret = -ENODEV; diff --git a/drivers/crypto/ccp/ccp-dev.h b/drivers/crypto/ccp/ccp-dev.h index 5e624920fd99..dd13468111cd 100644 --- a/drivers/crypto/ccp/ccp-dev.h +++ b/drivers/crypto/ccp/ccp-dev.h @@ -379,6 +379,7 @@ struct ccp_device { */ struct ccp_cmd_queue cmd_q[MAX_HW_QUEUES]; unsigned int cmd_q_count; + unsigned int max_q_count; /* Support for the CCP True RNG */ -- 2.45.2