diff options
Diffstat (limited to 'drivers/crypto/ccp/ccp-dev.c')
| -rw-r--r-- | drivers/crypto/ccp/ccp-dev.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/drivers/crypto/ccp/ccp-dev.c b/drivers/crypto/ccp/ccp-dev.c index f79eede71c62..73acf0fdb793 100644 --- a/drivers/crypto/ccp/ccp-dev.c +++ b/drivers/crypto/ccp/ccp-dev.c @@ -2,12 +2,13 @@ /* * AMD Cryptographic Coprocessor (CCP) driver * - * Copyright (C) 2013,2017 Advanced Micro Devices, Inc. + * Copyright (C) 2013,2019 Advanced Micro Devices, Inc. * * Author: Tom Lendacky <thomas.lendacky@amd.com> * Author: Gary R Hook <gary.hook@amd.com> */ +#include <linux/module.h> #include <linux/kernel.h> #include <linux/kthread.h> #include <linux/sched.h> @@ -19,6 +20,7 @@ #include <linux/delay.h> #include <linux/hw_random.h> #include <linux/cpu.h> +#include <linux/atomic.h> #ifdef CONFIG_X86 #include <asm/cpu_device_id.h> #endif @@ -26,6 +28,19 @@ #include "ccp-dev.h" +#define MAX_CCPS 32 + +/* 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)"); + +/* Limit the maximum number of configured CCPs */ +static atomic_t dev_count = ATOMIC_INIT(0); +static unsigned int max_devs = MAX_CCPS; +module_param(max_devs, uint, 0444); +MODULE_PARM_DESC(max_devs, "Maximum number of CCPs to enable (default: all; 0 disables all CCPs)"); + struct ccp_tasklet_data { struct completion completion; struct ccp_cmd *cmd; @@ -540,6 +555,10 @@ int ccp_dev_suspend(struct sp_device *sp, pm_message_t state) unsigned long flags; unsigned int i; + /* If there's no device there's nothing to do */ + if (!ccp) + return 0; + spin_lock_irqsave(&ccp->cmd_lock, flags); ccp->suspending = 1; @@ -564,6 +583,10 @@ int ccp_dev_resume(struct sp_device *sp) unsigned long flags; unsigned int i; + /* If there's no device there's nothing to do */ + if (!ccp) + return 0; + spin_lock_irqsave(&ccp->cmd_lock, flags); ccp->suspending = 0; @@ -586,12 +609,24 @@ int ccp_dev_init(struct sp_device *sp) struct ccp_device *ccp; int ret; + /* + * Check how many we have so far, and stop after reaching + * that number + */ + if (atomic_inc_return(&dev_count) > max_devs) + return 0; /* don't fail the load */ + ret = -ENOMEM; ccp = ccp_alloc_struct(sp); if (!ccp) 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; |