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Message-Id: <20231127063428.127436-3-yi.l.liu@intel.com>
Date: Sun, 26 Nov 2023 22:34:22 -0800
From: Yi Liu <yi.l.liu@...el.com>
To: joro@...tes.org, alex.williamson@...hat.com, jgg@...dia.com,
kevin.tian@...el.com, robin.murphy@....com,
baolu.lu@...ux.intel.com
Cc: cohuck@...hat.com, eric.auger@...hat.com, nicolinc@...dia.com,
kvm@...r.kernel.org, mjrosato@...ux.ibm.com,
chao.p.peng@...ux.intel.com, yi.l.liu@...el.com,
yi.y.sun@...ux.intel.com, peterx@...hat.com, jasowang@...hat.com,
shameerali.kolothum.thodi@...wei.com, lulu@...hat.com,
suravee.suthikulpanit@....com, iommu@...ts.linux.dev,
linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
zhenzhong.duan@...el.com, joao.m.martins@...cle.com,
xin.zeng@...el.com, yan.y.zhao@...el.com
Subject: [PATCH 2/8] iommufd: replace attach_fn with a structure
Most of the core logic before conducting the actual device attach/
replace operation can be shared with pasid attach/replace. Create
a new structure so more information (e.g. pasid) can be later added
along with the attach_fn.
Signed-off-by: Kevin Tian <kevin.tian@...el.com>
Signed-off-by: Yi Liu <yi.l.liu@...el.com>
---
drivers/iommu/iommufd/device.c | 35 ++++++++++++++++---------
drivers/iommu/iommufd/iommufd_private.h | 8 ++++++
2 files changed, 30 insertions(+), 13 deletions(-)
diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index 59d3a07300d9..0992d9d46af9 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -531,8 +531,11 @@ iommufd_device_do_replace(struct iommufd_device *idev,
return ERR_PTR(rc);
}
-typedef struct iommufd_hw_pagetable *(*attach_fn)(
- struct iommufd_device *idev, struct iommufd_hw_pagetable *hwpt);
+static struct iommufd_hw_pagetable *do_attach(struct iommufd_device *idev,
+ struct iommufd_hw_pagetable *hwpt, struct attach_data *data)
+{
+ return data->attach_fn(idev, hwpt);
+}
/*
* When automatically managing the domains we search for a compatible domain in
@@ -542,7 +545,7 @@ typedef struct iommufd_hw_pagetable *(*attach_fn)(
static struct iommufd_hw_pagetable *
iommufd_device_auto_get_domain(struct iommufd_device *idev,
struct iommufd_ioas *ioas, u32 *pt_id,
- attach_fn do_attach)
+ struct attach_data *data)
{
/*
* iommufd_hw_pagetable_attach() is called by
@@ -551,7 +554,7 @@ iommufd_device_auto_get_domain(struct iommufd_device *idev,
* to use the immediate_attach path as it supports drivers that can't
* directly allocate a domain.
*/
- bool immediate_attach = do_attach == iommufd_device_do_attach;
+ bool immediate_attach = data->attach_fn == iommufd_device_do_attach;
struct iommufd_hw_pagetable *destroy_hwpt;
struct iommufd_hwpt_paging *hwpt_paging;
struct iommufd_hw_pagetable *hwpt;
@@ -569,7 +572,7 @@ iommufd_device_auto_get_domain(struct iommufd_device *idev,
hwpt = &hwpt_paging->common;
if (!iommufd_lock_obj(&hwpt->obj))
continue;
- destroy_hwpt = (*do_attach)(idev, hwpt);
+ destroy_hwpt = do_attach(idev, hwpt, data);
if (IS_ERR(destroy_hwpt)) {
iommufd_put_object(&hwpt->obj);
/*
@@ -596,7 +599,7 @@ iommufd_device_auto_get_domain(struct iommufd_device *idev,
hwpt = &hwpt_paging->common;
if (!immediate_attach) {
- destroy_hwpt = (*do_attach)(idev, hwpt);
+ destroy_hwpt = do_attach(idev, hwpt, data);
if (IS_ERR(destroy_hwpt))
goto out_abort;
} else {
@@ -617,8 +620,8 @@ iommufd_device_auto_get_domain(struct iommufd_device *idev,
return destroy_hwpt;
}
-static int iommufd_device_change_pt(struct iommufd_device *idev, u32 *pt_id,
- attach_fn do_attach)
+int iommufd_device_change_pt(struct iommufd_device *idev, u32 *pt_id,
+ struct attach_data *data)
{
struct iommufd_hw_pagetable *destroy_hwpt;
struct iommufd_object *pt_obj;
@@ -633,7 +636,7 @@ static int iommufd_device_change_pt(struct iommufd_device *idev, u32 *pt_id,
struct iommufd_hw_pagetable *hwpt =
container_of(pt_obj, struct iommufd_hw_pagetable, obj);
- destroy_hwpt = (*do_attach)(idev, hwpt);
+ destroy_hwpt = do_attach(idev, hwpt, data);
if (IS_ERR(destroy_hwpt))
goto out_put_pt_obj;
break;
@@ -643,7 +646,7 @@ static int iommufd_device_change_pt(struct iommufd_device *idev, u32 *pt_id,
container_of(pt_obj, struct iommufd_ioas, obj);
destroy_hwpt = iommufd_device_auto_get_domain(idev, ioas, pt_id,
- do_attach);
+ data);
if (IS_ERR(destroy_hwpt))
goto out_put_pt_obj;
break;
@@ -679,8 +682,11 @@ static int iommufd_device_change_pt(struct iommufd_device *idev, u32 *pt_id,
int iommufd_device_attach(struct iommufd_device *idev, u32 *pt_id)
{
int rc;
+ struct attach_data data = {
+ .attach_fn = &iommufd_device_do_attach,
+ };
- rc = iommufd_device_change_pt(idev, pt_id, &iommufd_device_do_attach);
+ rc = iommufd_device_change_pt(idev, pt_id, &data);
if (rc)
return rc;
@@ -710,8 +716,11 @@ EXPORT_SYMBOL_NS_GPL(iommufd_device_attach, IOMMUFD);
*/
int iommufd_device_replace(struct iommufd_device *idev, u32 *pt_id)
{
- return iommufd_device_change_pt(idev, pt_id,
- &iommufd_device_do_replace);
+ struct attach_data data = {
+ .attach_fn = &iommufd_device_do_replace,
+ };
+
+ return iommufd_device_change_pt(idev, pt_id, &data);
}
EXPORT_SYMBOL_NS_GPL(iommufd_device_replace, IOMMUFD);
diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h
index 160521800d9b..24fee2c37ce8 100644
--- a/drivers/iommu/iommufd/iommufd_private.h
+++ b/drivers/iommu/iommufd/iommufd_private.h
@@ -363,6 +363,14 @@ iommufd_get_device(struct iommufd_ucmd *ucmd, u32 id)
void iommufd_device_destroy(struct iommufd_object *obj);
int iommufd_get_hw_info(struct iommufd_ucmd *ucmd);
+struct attach_data {
+ union {
+ struct iommufd_hw_pagetable *(*attach_fn)(
+ struct iommufd_device *idev,
+ struct iommufd_hw_pagetable *hwpt);
+ };
+};
+
struct iommufd_access {
struct iommufd_object obj;
struct iommufd_ctx *ictx;
--
2.34.1
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