Commit 0cc88dd8 authored by Xingang Wang's avatar Xingang Wang Committed by Yang Yingliang
Browse files

svm: Add support to get svm mpam configuration 

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


CVE: NA

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

This add interface to get mpam configuration of accelarators managed
by svm. The svm mpam get interface traverse all accelrators, and if
all succeed, return the last successful result.

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 129938f5

drivers/char/svm.c

+85 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include <linux/sched/mm.h>

#include <linux/msi.h>

#include <linux/acpi.h>

#include <linux/ascend_smmu.h>



#define SVM_DEVICE_NAME "svm"

#define ASID_SHIFT		48
@@ -72,8 +73,11 @@ struct svm_device { 
	struct device		*dev;

	phys_addr_t l2buff;

	unsigned long		l2size;

	struct list_head	entry;

};



static LIST_HEAD(sdev_list);



struct svm_bind_process {

	pid_t			vpid;

	u64			ttbr;
@@ -124,6 +128,15 @@ struct meminfo { 
	unsigned long hugetlbtotal;

};



struct svm_mpam {

#define SVM_GET_DEV_MPAM	(1 << 0)

	int flags;

	int pasid;

	int partid;

	int pmg;

	int s1mpam;

};



static struct bus_type svm_bus_type = {

	.name		= "svm_bus",

};
@@ -1183,6 +1196,76 @@ int svm_get_pasid(pid_t vpid, int dev_id __maybe_unused) 
}

EXPORT_SYMBOL_GPL(svm_get_pasid);



static int svm_get_core_mpam(struct device *dev, void *data)

{

	int err = 0;

	struct svm_mpam *mpam = data;



	if (mpam->flags & SVM_GET_DEV_MPAM) {

		err = arm_smmu_get_dev_mpam(dev, mpam->pasid, &mpam->partid,

				&mpam->pmg, &mpam->s1mpam);

		if (err) {

			dev_err(dev, "get mpam failed, %d\n", err);

			return err;

		}

	}



	return err;

}



int __svm_get_mpam(struct svm_mpam *mpam)

{

	int err = 0;

#ifdef CONFIG_ACPI

	struct core_device *cdev = NULL;

#else

	struct svm_device *sdev = NULL;

#endif

#ifdef CONFIG_ACPI

	list_for_each_entry(cdev, &child_list, entry) {

		err = svm_get_core_mpam(&cdev->dev, mpam);

		if (err)

			return err;

	}

#else

	list_for_each_entry(sdev, &sdev_list, entry) {

		err = device_for_each_child(sdev->dev, mpam, svm_get_core_mpam);

		if (err)

			return err;

	}

#endif

	return 0;

}



/**

 * svm_get_mpam() - get smmu mpam configuration of core device

 * @pasid: substream id

 * @partid: pointer to partid

 * @pmg: pointer to pmg

 * @s1mpam: pointer to s1mpam

 */

int svm_get_mpam(int pasid, int *partid, int *pmg, int *s1mpam)

{

	int err = 0;

	struct svm_mpam mpam;



	if (!partid || !pmg || !s1mpam)

		return -EINVAL;



	mpam.flags = SVM_GET_DEV_MPAM,

	mpam.pasid = pasid,

	err = __svm_get_mpam(&mpam);

	if (err)

		return err;



	*partid = mpam.partid;

	*pmg = mpam.pmg;

	*s1mpam = mpam.s1mpam;



	return 0;

}

EXPORT_SYMBOL_GPL(svm_get_mpam);



static int svm_set_rc(unsigned long __user *arg)

{

	unsigned long addr, size, rc;
@@ -1792,6 +1875,7 @@ static int svm_device_probe(struct platform_device *pdev) 
	if (sdev->miscdev.name == NULL)

		return -ENOMEM;



	list_add(&sdev->entry, &sdev_list);

	dev_set_drvdata(dev, sdev);

	err = misc_register(&sdev->miscdev);

	if (err) {
@@ -1840,6 +1924,7 @@ static int svm_device_remove(struct platform_device *pdev) 


	device_for_each_child(sdev->dev, NULL, svm_remove_core);

	misc_deregister(&sdev->miscdev);

	list_del(&sdev->entry);



	return 0;

}

include/linux/ascend_smmu.h

+2 −0
Original line number Diff line number Diff line
@@ -12,4 +12,6 @@ extern int arm_smmu_get_dev_mpam(struct device *dev, int ssid, int *partid, 
extern int arm_smmu_set_dev_user_mpam_en(struct device *dev, int user_mpam_en);

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);



#endif /* __LINUX_ASCEND_SMMU_H */