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iommu: Add max_pasids field in struct dev_iommu 

Use this field to save the number of PASIDs that a device is able to
consume. It is a generic attribute of a device and lifting it into the
per-device dev_iommu struct could help to avoid the boilerplate code
in various IOMMU drivers.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Tony Zhu <tony.zhu@intel.com>
Link: https://lore.kernel.org/r/20221031005917.45690-3-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2022-10-31 08:59:06 +08:00 committed by Joerg Roedel
parent 1adf3cc20d
commit 22d2c7afb3
2 changed files with 22 additions and 0 deletions
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20
drivers/iommu/iommu.c
View File

@ -21,6 +21,7 @@
#include <linux/idr.h>
#include <linux/err.h>
#include <linux/pci.h>
#include <linux/pci-ats.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>
#include <linux/property.h>
@ -278,6 +279,24 @@ static void dev_iommu_free(struct device *dev)
kfree(param);
}
static u32 dev_iommu_get_max_pasids(struct device *dev)
{
u32 max_pasids = 0, bits = 0;
int ret;
if (dev_is_pci(dev)) {
ret = pci_max_pasids(to_pci_dev(dev));
if (ret > 0)
max_pasids = ret;
} else {
ret = device_property_read_u32(dev, "pasid-num-bits", &bits);
if (!ret)
max_pasids = 1UL << bits;
}
return min_t(u32, max_pasids, dev->iommu->iommu_dev->max_pasids);
}
static int __iommu_probe_device(struct device *dev, struct list_head *group_list)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
@ -303,6 +322,7 @@ static int __iommu_probe_device(struct device *dev, struct list_head *group_list
}
dev->iommu->iommu_dev = iommu_dev;
dev->iommu->max_pasids = dev_iommu_get_max_pasids(dev);
group = iommu_group_get_for_dev(dev);
if (IS_ERR(group)) {

2
include/linux/iommu.h
View File

@ -368,6 +368,7 @@ struct iommu_fault_param {
* @fwspec: IOMMU fwspec data
* @iommu_dev: IOMMU device this device is linked to
* @priv: IOMMU Driver private data
* @max_pasids: number of PASIDs this device can consume
*
* TODO: migrate other per device data pointers under iommu_dev_data, e.g.
* struct iommu_group *iommu_group;
@ -379,6 +380,7 @@ struct dev_iommu {
struct iommu_fwspec *fwspec;
struct iommu_device *iommu_dev;
void *priv;
u32 max_pasids;
};
int iommu_device_register(struct iommu_device *iommu,