lkml.org 
[lkml]   [2019]   [Jul]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH 02/21] x86/sgx: Move bus registration and device init to common code
Date
Move the SGX bus registration and initialization into common code in
preparation for adding a virtual EPC device, which will reside outside
of the native SGX userspace driver.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kernel/cpu/sgx/driver/main.c | 48 +------------------------
arch/x86/kernel/cpu/sgx/main.c | 50 ++++++++++++++++++++++++++-
arch/x86/kernel/cpu/sgx/sgx.h | 4 +++
3 files changed, 54 insertions(+), 48 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/driver/main.c b/arch/x86/kernel/cpu/sgx/driver/main.c
index a2506a49c95a..d62bdc7ed4d9 100644
--- a/arch/x86/kernel/cpu/sgx/driver/main.c
+++ b/arch/x86/kernel/cpu/sgx/driver/main.c
@@ -158,42 +158,10 @@ const struct file_operations sgx_provision_fops = {
.owner = THIS_MODULE,
};

-static struct bus_type sgx_bus_type = {
- .name = "sgx",
-};
-
static struct device sgx_encl_dev;
static struct cdev sgx_encl_cdev;
static struct device sgx_provision_dev;
static struct cdev sgx_provision_cdev;
-static dev_t sgx_devt;
-
-static void sgx_dev_release(struct device *dev)
-{
-}
-
-static __init int sgx_dev_init(const char *name, struct device *dev,
- struct cdev *cdev,
- const struct file_operations *fops, int minor)
-{
- int ret;
-
- device_initialize(dev);
-
- dev->bus = &sgx_bus_type;
- dev->devt = MKDEV(MAJOR(sgx_devt), minor);
- dev->release = sgx_dev_release;
-
- ret = dev_set_name(dev, name);
- if (ret) {
- put_device(dev);
- return ret;
- }
-
- cdev_init(cdev, fops);
- cdev->owner = THIS_MODULE;
- return 0;
-}

int __init sgx_drv_init(void)
{
@@ -207,14 +175,6 @@ int __init sgx_drv_init(void)
return -ENODEV;
}

- ret = bus_register(&sgx_bus_type);
- if (ret)
- return ret;
-
- ret = alloc_chrdev_region(&sgx_devt, 0, SGX_MAX_NR_DEVICES, "sgx");
- if (ret < 0)
- goto err_bus;
-
cpuid_count(SGX_CPUID, 0, &eax, &ebx, &ecx, &edx);
sgx_misc_reserved_mask = ~ebx | SGX_MISC_RESERVED_MASK;
sgx_encl_size_max_64 = 1ULL << ((edx >> 8) & 0xFF);
@@ -240,7 +200,7 @@ int __init sgx_drv_init(void)
ret = sgx_dev_init("sgx/enclave", &sgx_encl_dev, &sgx_encl_cdev,
&sgx_encl_fops, SGX_ENCL_DEV_MINOR);
if (ret)
- goto err_chrdev_region;
+ return ret;

ret = sgx_dev_init("sgx/provision", &sgx_provision_dev,
&sgx_provision_cdev, &sgx_provision_fops,
@@ -277,11 +237,5 @@ int __init sgx_drv_init(void)
err_encl_dev:
put_device(&sgx_encl_dev);

-err_chrdev_region:
- unregister_chrdev_region(sgx_devt, SGX_MAX_NR_DEVICES);
-
-err_bus:
- bus_unregister(&sgx_bus_type);
-
return ret;
}
diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index f790a03571c5..edbd465083c7 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
// Copyright(c) 2016-17 Intel Corporation.

+#include <linux/cdev.h>
#include <linux/freezer.h>
#include <linux/highmem.h>
#include <linux/kthread.h>
@@ -329,6 +330,39 @@ static __init int sgx_page_cache_init(void)
return 0;
}

+static struct bus_type sgx_bus_type = {
+ .name = "sgx",
+};
+static dev_t sgx_devt;
+
+static void sgx_dev_release(struct device *dev)
+{
+
+}
+
+__init int sgx_dev_init(const char *name, struct device *dev,
+ struct cdev *cdev, const struct file_operations *fops,
+ int minor)
+{
+ int ret;
+
+ device_initialize(dev);
+
+ dev->bus = &sgx_bus_type;
+ dev->devt = MKDEV(MAJOR(sgx_devt), minor);
+ dev->release = sgx_dev_release;
+
+ ret = dev_set_name(dev, name);
+ if (ret) {
+ put_device(dev);
+ return ret;
+ }
+
+ cdev_init(cdev, fops);
+ cdev->owner = THIS_MODULE;
+ return 0;
+}
+
static __init int sgx_init(void)
{
int ret;
@@ -344,12 +378,26 @@ static __init int sgx_init(void)
if (ret)
goto err_page_cache;

- ret = sgx_drv_init();
+ ret = bus_register(&sgx_bus_type);
if (ret)
goto err_kthread;

+ ret = alloc_chrdev_region(&sgx_devt, 0, SGX_MAX_NR_DEVICES, "sgx");
+ if (ret < 0)
+ goto err_bus;
+
+ ret = sgx_drv_init();
+ if (ret)
+ goto err_chrdev_region;
+
return 0;

+err_chrdev_region:
+ unregister_chrdev_region(sgx_devt, SGX_MAX_NR_DEVICES);
+
+err_bus:
+ bus_unregister(&sgx_bus_type);
+
err_kthread:
kthread_stop(ksgxswapd_tsk);

diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h
index 4e2c3ce94f63..85b3674e1d43 100644
--- a/arch/x86/kernel/cpu/sgx/sgx.h
+++ b/arch/x86/kernel/cpu/sgx/sgx.h
@@ -93,4 +93,8 @@ int sgx_einit(struct sgx_sigstruct *sigstruct, struct sgx_einittoken *token,
#define SGX_PROV_DEV_MINOR 1
#define SGX_MAX_NR_DEVICES 2

+__init int sgx_dev_init(const char *name, struct device *dev,
+ struct cdev *cdev, const struct file_operations *fops,
+ int minor);
+
#endif /* _X86_SGX_H */
--
2.22.0
\
 
 \ /
  Last update: 2019-07-27 07:55    [W:0.125 / U:6.624 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site