forked from mirrors/linux
iommu/ipmmu-vmsa: Replace local utlb code with fwspec ids
Now when both 32-bit and 64-bit code inside the driver is using fwspec it is possible to replace the utlb handling with fwspec ids that get populated from ->of_xlate(). Suggested-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Magnus Damm <damm+renesas@opensource.se> Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Magnus Damm
Joerg Roedel
parent
3c49ed322b
commit
7b2d59611f
1 changed files with 19 additions and 85 deletions
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@ -19,6 +19,7 @@
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#include <linux/iommu.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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@ -59,8 +60,6 @@ struct ipmmu_vmsa_domain {
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struct ipmmu_vmsa_iommu_priv {
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struct ipmmu_vmsa_device *mmu;
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unsigned int *utlbs;
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unsigned int num_utlbs;
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struct device *dev;
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struct list_head list;
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};
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@ -550,13 +549,14 @@ static int ipmmu_attach_device(struct iommu_domain *io_domain,
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struct device *dev)
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{
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struct ipmmu_vmsa_iommu_priv *priv = to_priv(dev);
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struct iommu_fwspec *fwspec = dev->iommu_fwspec;
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struct ipmmu_vmsa_device *mmu = priv->mmu;
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struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
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unsigned long flags;
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unsigned int i;
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int ret = 0;
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if (!mmu) {
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if (!priv || !priv->mmu) {
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dev_err(dev, "Cannot attach to IPMMU\n");
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return -ENXIO;
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}
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@ -583,8 +583,8 @@ static int ipmmu_attach_device(struct iommu_domain *io_domain,
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if (ret < 0)
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return ret;
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for (i = 0; i < priv->num_utlbs; ++i)
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ipmmu_utlb_enable(domain, priv->utlbs[i]);
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for (i = 0; i < fwspec->num_ids; ++i)
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ipmmu_utlb_enable(domain, fwspec->ids[i]);
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return 0;
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}
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@ -592,12 +592,12 @@ static int ipmmu_attach_device(struct iommu_domain *io_domain,
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static void ipmmu_detach_device(struct iommu_domain *io_domain,
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struct device *dev)
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{
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struct ipmmu_vmsa_iommu_priv *priv = to_priv(dev);
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struct iommu_fwspec *fwspec = dev->iommu_fwspec;
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struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
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unsigned int i;
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for (i = 0; i < priv->num_utlbs; ++i)
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ipmmu_utlb_disable(domain, priv->utlbs[i]);
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for (i = 0; i < fwspec->num_ids; ++i)
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ipmmu_utlb_disable(domain, fwspec->ids[i]);
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/*
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* TODO: Optimize by disabling the context when no device is attached.
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@ -633,102 +633,36 @@ static phys_addr_t ipmmu_iova_to_phys(struct iommu_domain *io_domain,
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return domain->iop->iova_to_phys(domain->iop, iova);
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}
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static int ipmmu_find_utlbs(struct ipmmu_vmsa_device *mmu, struct device *dev,
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unsigned int *utlbs, unsigned int num_utlbs)
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{
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unsigned int i;
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for (i = 0; i < num_utlbs; ++i) {
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struct of_phandle_args args;
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int ret;
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ret = of_parse_phandle_with_args(dev->of_node, "iommus",
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"#iommu-cells", i, &args);
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if (ret < 0)
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return ret;
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of_node_put(args.np);
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if (args.np != mmu->dev->of_node || args.args_count != 1)
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return -EINVAL;
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utlbs[i] = args.args[0];
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}
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return 0;
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}
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static int ipmmu_init_platform_device(struct device *dev)
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static int ipmmu_init_platform_device(struct device *dev,
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struct of_phandle_args *args)
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{
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struct platform_device *ipmmu_pdev;
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struct ipmmu_vmsa_iommu_priv *priv;
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struct ipmmu_vmsa_device *mmu;
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unsigned int *utlbs;
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unsigned int i;
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int num_utlbs;
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int ret = -ENODEV;
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/* Find the master corresponding to the device. */
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num_utlbs = of_count_phandle_with_args(dev->of_node, "iommus",
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"#iommu-cells");
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if (num_utlbs < 0)
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ipmmu_pdev = of_find_device_by_node(args->np);
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if (!ipmmu_pdev)
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return -ENODEV;
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utlbs = kcalloc(num_utlbs, sizeof(*utlbs), GFP_KERNEL);
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if (!utlbs)
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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spin_lock(&ipmmu_devices_lock);
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list_for_each_entry(mmu, &ipmmu_devices, list) {
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ret = ipmmu_find_utlbs(mmu, dev, utlbs, num_utlbs);
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if (!ret) {
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/*
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* TODO Take a reference to the MMU to protect
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* against device removal.
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*/
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break;
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}
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}
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spin_unlock(&ipmmu_devices_lock);
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if (ret < 0)
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goto error;
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for (i = 0; i < num_utlbs; ++i) {
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if (utlbs[i] >= mmu->num_utlbs) {
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ret = -EINVAL;
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goto error;
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}
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}
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv) {
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ret = -ENOMEM;
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goto error;
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}
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priv->mmu = mmu;
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priv->utlbs = utlbs;
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priv->num_utlbs = num_utlbs;
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priv->mmu = platform_get_drvdata(ipmmu_pdev);
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priv->dev = dev;
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dev->iommu_fwspec->iommu_priv = priv;
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return 0;
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error:
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kfree(utlbs);
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return ret;
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}
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static int ipmmu_of_xlate(struct device *dev,
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struct of_phandle_args *spec)
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{
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iommu_fwspec_add_ids(dev, spec->args, 1);
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/* Initialize once - xlate() will call multiple times */
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if (to_priv(dev))
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return 0;
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return ipmmu_init_platform_device(dev);
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return ipmmu_init_platform_device(dev, spec);
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}
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#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
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