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iommu/arm-smmu: Use drvdata instead of maintaining smmu_devices list 

Rather than keep a private list of struct arm_smmu_device and searching
this whenever we need to look up the correct SMMU instance, instead use
the drvdata field in the struct device to take care of the mapping for
us.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2015-08-11 16:25:10 +01:00
parent 25cb62b764
commit 941a802d93
1 changed files with 9 additions and 33 deletions
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42
drivers/iommu/arm-smmu-v3.c
View File

@ -28,6 +28,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
@ -568,7 +569,6 @@ struct arm_smmu_device {
unsigned int sid_bits;
struct arm_smmu_strtab_cfg strtab_cfg;
struct list_head list;
};
/* SMMU private data for an IOMMU group */
@ -603,10 +603,6 @@ struct arm_smmu_domain {
struct iommu_domain domain;
};
/* Our list of SMMU instances */
static DEFINE_SPINLOCK(arm_smmu_devices_lock);
static LIST_HEAD(arm_smmu_devices);
struct arm_smmu_option_prop {
u32 opt;
const char *prop;
@ -1722,7 +1718,8 @@ static void __arm_smmu_release_pci_iommudata(void *data)
static struct arm_smmu_device *arm_smmu_get_for_pci_dev(struct pci_dev *pdev)
{
struct device_node *of_node;
struct arm_smmu_device *curr, *smmu = NULL;
struct platform_device *smmu_pdev;
struct arm_smmu_device *smmu = NULL;
struct pci_bus *bus = pdev->bus;
/* Walk up to the root bus */
@ -1735,14 +1732,10 @@ static struct arm_smmu_device *arm_smmu_get_for_pci_dev(struct pci_dev *pdev)
return NULL;
/* See if we can find an SMMU corresponding to the phandle */
spin_lock(&arm_smmu_devices_lock);
list_for_each_entry(curr, &arm_smmu_devices, list) {
if (curr->dev->of_node == of_node) {
smmu = curr;
break;
}
}
spin_unlock(&arm_smmu_devices_lock);
smmu_pdev = of_find_device_by_node(of_node);
if (smmu_pdev)
smmu = platform_get_drvdata(smmu_pdev);
of_node_put(of_node);
return smmu;
}
@ -2609,10 +2602,7 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
goto out_free_structures;
/* Record our private device structure */
INIT_LIST_HEAD(&smmu->list);
spin_lock(&arm_smmu_devices_lock);
list_add(&smmu->list, &arm_smmu_devices);
spin_unlock(&arm_smmu_devices_lock);
platform_set_drvdata(pdev, smmu);
return 0;
out_free_structures:
@ -2622,21 +2612,7 @@ out_free_structures:
static int arm_smmu_device_remove(struct platform_device *pdev)
{
struct arm_smmu_device *curr, *smmu = NULL;
struct device *dev = &pdev->dev;
spin_lock(&arm_smmu_devices_lock);
list_for_each_entry(curr, &arm_smmu_devices, list) {
if (curr->dev == dev) {
smmu = curr;
list_del(&smmu->list);
break;
}
}
spin_unlock(&arm_smmu_devices_lock);
if (!smmu)
return -ENODEV;
struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
arm_smmu_device_disable(smmu);
arm_smmu_free_structures(smmu);