diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/ipmmu-vmsa.c | 92 |
1 files changed, 52 insertions, 40 deletions
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c index b084530babf4..1949f3c55679 100644 --- a/drivers/iommu/ipmmu-vmsa.c +++ b/drivers/iommu/ipmmu-vmsa.c @@ -44,6 +44,11 @@ struct ipmmu_vmsa_domain { pgd_t *pgd; }; +struct ipmmu_vmsa_archdata { + struct ipmmu_vmsa_device *mmu; + unsigned int utlb; +}; + static DEFINE_SPINLOCK(ipmmu_devices_lock); static LIST_HEAD(ipmmu_devices); @@ -265,14 +270,19 @@ static void ipmmu_tlb_invalidate(struct ipmmu_vmsa_domain *domain) * Enable MMU translation for the microTLB. */ static void ipmmu_utlb_enable(struct ipmmu_vmsa_domain *domain, - const struct ipmmu_vmsa_master *master) + unsigned int utlb) { struct ipmmu_vmsa_device *mmu = domain->mmu; + /* + * TODO: Reference-count the microTLB as several bus masters can be + * connected to the same microTLB. + */ + /* TODO: What should we set the ASID to ? */ - ipmmu_write(mmu, IMUASID(master->utlb), 0); + ipmmu_write(mmu, IMUASID(utlb), 0); /* TODO: Do we need to flush the microTLB ? */ - ipmmu_write(mmu, IMUCTR(master->utlb), + ipmmu_write(mmu, IMUCTR(utlb), IMUCTR_TTSEL_MMU(domain->context_id) | IMUCTR_FLUSH | IMUCTR_MMUEN); } @@ -281,11 +291,11 @@ static void ipmmu_utlb_enable(struct ipmmu_vmsa_domain *domain, * Disable MMU translation for the microTLB. */ static void ipmmu_utlb_disable(struct ipmmu_vmsa_domain *domain, - const struct ipmmu_vmsa_master *master) + unsigned int utlb) { struct ipmmu_vmsa_device *mmu = domain->mmu; - ipmmu_write(mmu, IMUCTR(master->utlb), 0); + ipmmu_write(mmu, IMUCTR(utlb), 0); } static void ipmmu_flush_pgtable(struct ipmmu_vmsa_device *mmu, void *addr, @@ -674,21 +684,6 @@ static int ipmmu_handle_mapping(struct ipmmu_vmsa_domain *domain, * IOMMU Operations */ -static const struct ipmmu_vmsa_master * -ipmmu_find_master(struct ipmmu_vmsa_device *ipmmu, struct device *dev) -{ - const struct ipmmu_vmsa_master *master = ipmmu->pdata->masters; - const char *devname = dev_name(dev); - unsigned int i; - - for (i = 0; i < ipmmu->pdata->num_masters; ++i, ++master) { - if (strcmp(master->name, devname) == 0) - return master; - } - - return NULL; -} - static int ipmmu_domain_init(struct iommu_domain *io_domain) { struct ipmmu_vmsa_domain *domain; @@ -727,9 +722,9 @@ static void ipmmu_domain_destroy(struct iommu_domain *io_domain) static int ipmmu_attach_device(struct iommu_domain *io_domain, struct device *dev) { - struct ipmmu_vmsa_device *mmu = dev->archdata.iommu; + struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu; + struct ipmmu_vmsa_device *mmu = archdata->mmu; struct ipmmu_vmsa_domain *domain = io_domain->priv; - const struct ipmmu_vmsa_master *master; unsigned long flags; int ret = 0; @@ -759,11 +754,7 @@ static int ipmmu_attach_device(struct iommu_domain *io_domain, if (ret < 0) return ret; - master = ipmmu_find_master(mmu, dev); - if (!master) - return -EINVAL; - - ipmmu_utlb_enable(domain, master); + ipmmu_utlb_enable(domain, archdata->utlb); return 0; } @@ -771,14 +762,10 @@ static int ipmmu_attach_device(struct iommu_domain *io_domain, static void ipmmu_detach_device(struct iommu_domain *io_domain, struct device *dev) { + struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu; struct ipmmu_vmsa_domain *domain = io_domain->priv; - const struct ipmmu_vmsa_master *master; - master = ipmmu_find_master(domain->mmu, dev); - if (!master) - return; - - ipmmu_utlb_disable(domain, master); + ipmmu_utlb_disable(domain, archdata->utlb); /* * TODO: Optimize by disabling the context when no device is attached. @@ -839,11 +826,26 @@ static phys_addr_t ipmmu_iova_to_phys(struct iommu_domain *io_domain, return __pfn_to_phys(pte_pfn(pte)) | (iova & ~PAGE_MASK); } +static int ipmmu_find_utlb(struct ipmmu_vmsa_device *mmu, struct device *dev) +{ + const struct ipmmu_vmsa_master *master = mmu->pdata->masters; + const char *devname = dev_name(dev); + unsigned int i; + + for (i = 0; i < mmu->pdata->num_masters; ++i, ++master) { + if (strcmp(master->name, devname) == 0) + return master->utlb; + } + + return -1; +} + static int ipmmu_add_device(struct device *dev) { - const struct ipmmu_vmsa_master *master = NULL; + struct ipmmu_vmsa_archdata *archdata; struct ipmmu_vmsa_device *mmu; struct iommu_group *group; + int utlb = -1; int ret; if (dev->archdata.iommu) { @@ -856,10 +858,10 @@ static int ipmmu_add_device(struct device *dev) spin_lock(&ipmmu_devices_lock); list_for_each_entry(mmu, &ipmmu_devices, list) { - master = ipmmu_find_master(mmu, dev); - if (master) { + utlb = ipmmu_find_utlb(mmu, dev); + if (utlb >= 0) { /* - * TODO Take a reference to the master to protect + * TODO Take a reference to the MMU to protect * against device removal. */ break; @@ -868,10 +870,10 @@ static int ipmmu_add_device(struct device *dev) spin_unlock(&ipmmu_devices_lock); - if (!master) + if (utlb < 0) return -ENODEV; - if (!master->utlb >= mmu->num_utlbs) + if (utlb >= mmu->num_utlbs) return -EINVAL; /* Create a device group and add the device to it. */ @@ -889,7 +891,15 @@ static int ipmmu_add_device(struct device *dev) return ret; } - dev->archdata.iommu = mmu; + archdata = kzalloc(sizeof(*archdata), GFP_KERNEL); + if (!archdata) { + ret = -ENOMEM; + goto error; + } + + archdata->mmu = mmu; + archdata->utlb = utlb; + dev->archdata.iommu = archdata; /* * Create the ARM mapping, used by the ARM DMA mapping core to allocate @@ -923,6 +933,7 @@ static int ipmmu_add_device(struct device *dev) return 0; error: + kfree(dev->archdata.iommu); dev->archdata.iommu = NULL; iommu_group_remove_device(dev); return ret; @@ -932,6 +943,7 @@ static void ipmmu_remove_device(struct device *dev) { arm_iommu_detach_device(dev); iommu_group_remove_device(dev); + kfree(dev->archdata.iommu); dev->archdata.iommu = NULL; } |
