Commit c50ad40d authored by Xingang Wang's avatar Xingang Wang Committed by Yang Yingliang
Browse files

svm: Add svm_set_user_mpam_en to enable/disable mpam for smmu 

ascend inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I49RB2


CVE: NA

-------------------------------------------------

The user_mpam_en configuration is used to enable/disable
mpam for SMMU. If user_mpam_en is set as true, the memory
requests across SMMU will carry the mpamid information,
otherwise the mpamid will not take effect.

Signed-off-by: default avatarXingang Wang <wangxingang5@huawei.com>
Reviewed-by: default avatarYingtai Xie <xieyingtai@huawei.com>
Reviewed-by: default avatarDing Tianhong <dingtianhong@huawei.com>
Signed-off-by: default avatarYang Yingliang <yangyingliang@huawei.com>
parent 464f6990

drivers/char/svm.c

+64 −0
Original line number Diff line number Diff line
@@ -131,11 +131,14 @@ struct meminfo { 
struct svm_mpam {

#define SVM_GET_DEV_MPAM	(1 << 0)

#define SVM_SET_DEV_MPAM	(1 << 1)

#define SVM_GET_USER_MPAM_EN	(1 << 2)

#define SVM_SET_USER_MPAM_EN	(1 << 3)

	int flags;

	int pasid;

	int partid;

	int pmg;

	int s1mpam;

	int user_mpam_en;

};



static struct bus_type svm_bus_type = {
@@ -1211,6 +1214,14 @@ static int svm_get_core_mpam(struct device *dev, void *data) 
		}

	}



	if (mpam->flags & SVM_GET_USER_MPAM_EN) {

		err = arm_smmu_get_dev_user_mpam_en(dev, &mpam->user_mpam_en);

		if (err) {

			dev_err(dev, "set user_mpam_en failed, %d\n", err);

			return err;

		}

	}



	return err;

}
@@ -1252,6 +1263,14 @@ static int svm_set_core_mpam(struct device *dev, void *data) 
		}

	}



	if (mpam->flags & SVM_SET_USER_MPAM_EN) {

		err = arm_smmu_set_dev_user_mpam_en(dev, mpam->user_mpam_en);

		if (err) {

			dev_err(dev, "set user_mpam_en failed, %d\n", err);

			return err;

		}

	}



	return 0;

}
@@ -1345,6 +1364,51 @@ int svm_get_mpam(int pasid, int *partid, int *pmg, int *s1mpam) 
}

EXPORT_SYMBOL_GPL(svm_get_mpam);



/**

 * svm_set_user_mpam_en() - set user_mpam_en

 * @user_mpam_en: 0 for smmu mpam, 1 for user mpam

 */

int svm_set_user_mpam_en(int user_mpam_en)

{

	int err;

	struct svm_mpam mpam, old_mpam;



	old_mpam.flags = SVM_GET_USER_MPAM_EN;

	err = __svm_get_mpam(&old_mpam);



	mpam.flags = SVM_SET_USER_MPAM_EN,

	mpam.user_mpam_en = user_mpam_en,

	err = __svm_set_mpam(&mpam);

	if (err)

		goto rollback;



	return 0;



rollback:

	__svm_set_mpam(&mpam);

	return err;

}

EXPORT_SYMBOL_GPL(svm_set_user_mpam_en);



/**

 * svm_set_user_mpam_en() - set user_mpam_en

 * @user_mpam_en: pointer to user_mpam_en

 */

int svm_get_user_mpam_en(int *user_mpam_en)

{

	int err;

	struct svm_mpam mpam;



	mpam.flags = SVM_GET_USER_MPAM_EN;

	err = __svm_get_mpam(&mpam);

	if (err)

		return err;



	*user_mpam_en = mpam.user_mpam_en;

	return 0;

}

EXPORT_SYMBOL_GPL(svm_get_user_mpam_en);



static int svm_set_rc(unsigned long __user *arg)

{

	unsigned long addr, size, rc;

include/linux/ascend_smmu.h

+3 −0
Original line number Diff line number Diff line
@@ -15,4 +15,7 @@ extern int arm_smmu_get_dev_user_mpam_en(struct device *dev, int *user_mpam_en); 
extern int svm_get_mpam(int pasid, int *partid, int *pmg, int *s1mpam);

extern int svm_set_mpam(int pasid, int partid, int pmg, int s1mpam);



extern int svm_set_user_mpam_en(int user_mpam_en);

extern int svm_get_user_mpam_en(int *user_mpam_en);



#endif /* __LINUX_ASCEND_SMMU_H */