diff options
author | 2016-04-11 10:41:07 +0300 | |
---|---|---|
committer | 2016-04-13 08:17:18 +0300 | |
commit | e09b41010ba33a20a87472ee821fa407a5b8da36 (patch) | |
tree | d10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/drivers/iommu/exynos-iommu.c | |
parent | f93b97fd65072de626c074dbe099a1fff05ce060 (diff) |
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page.
During the rebasing, the following patch collided:
Force tick interrupt and get rid of softirq magic(I70131fb85).
Collisions have been removed because its logic was found on the
source already.
Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/drivers/iommu/exynos-iommu.c')
-rw-r--r-- | kernel/drivers/iommu/exynos-iommu.c | 527 |
1 files changed, 269 insertions, 258 deletions
diff --git a/kernel/drivers/iommu/exynos-iommu.c b/kernel/drivers/iommu/exynos-iommu.c index 3e898504a..97c41b8ab 100644 --- a/kernel/drivers/iommu/exynos-iommu.c +++ b/kernel/drivers/iommu/exynos-iommu.c @@ -12,21 +12,22 @@ #define DEBUG #endif -#include <linux/io.h> -#include <linux/interrupt.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/pm_runtime.h> #include <linux/clk.h> +#include <linux/dma-mapping.h> #include <linux/err.h> -#include <linux/mm.h> +#include <linux/io.h> #include <linux/iommu.h> -#include <linux/errno.h> +#include <linux/interrupt.h> #include <linux/list.h> -#include <linux/memblock.h> -#include <linux/export.h> +#include <linux/of.h> +#include <linux/of_iommu.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> #include <asm/cacheflush.h> +#include <asm/dma-iommu.h> #include <asm/pgtable.h> typedef u32 sysmmu_iova_t; @@ -184,35 +185,50 @@ static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = { "UNKNOWN FAULT" }; -/* attached to dev.archdata.iommu of the master device */ +/* + * This structure is attached to dev.archdata.iommu of the master device + * on device add, contains a list of SYSMMU controllers defined by device tree, + * which are bound to given master device. It is usually referenced by 'owner' + * pointer. +*/ struct exynos_iommu_owner { - struct list_head client; /* entry of exynos_iommu_domain.clients */ - struct device *dev; - struct device *sysmmu; - struct iommu_domain *domain; - void *vmm_data; /* IO virtual memory manager's data */ - spinlock_t lock; /* Lock to preserve consistency of System MMU */ + struct list_head controllers; /* list of sysmmu_drvdata.owner_node */ }; +/* + * This structure exynos specific generalization of struct iommu_domain. + * It contains list of SYSMMU controllers from all master devices, which has + * been attached to this domain and page tables of IO address space defined by + * it. It is usually referenced by 'domain' pointer. + */ struct exynos_iommu_domain { - struct list_head clients; /* list of sysmmu_drvdata.node */ - sysmmu_pte_t *pgtable; /* lv1 page table, 16KB */ - short *lv2entcnt; /* free lv2 entry counter for each section */ - spinlock_t lock; /* lock for this structure */ - spinlock_t pgtablelock; /* lock for modifying page table @ pgtable */ + struct list_head clients; /* list of sysmmu_drvdata.domain_node */ + sysmmu_pte_t *pgtable; /* lv1 page table, 16KB */ + short *lv2entcnt; /* free lv2 entry counter for each section */ + spinlock_t lock; /* lock for modyfying list of clients */ + spinlock_t pgtablelock; /* lock for modifying page table @ pgtable */ struct iommu_domain domain; /* generic domain data structure */ }; +/* + * This structure hold all data of a single SYSMMU controller, this includes + * hw resources like registers and clocks, pointers and list nodes to connect + * it to all other structures, internal state and parameters read from device + * tree. It is usually referenced by 'data' pointer. + */ struct sysmmu_drvdata { - struct device *sysmmu; /* System MMU's device descriptor */ - struct device *master; /* Owner of system MMU */ - void __iomem *sfrbase; - struct clk *clk; - struct clk *clk_master; - int activations; - spinlock_t lock; - struct iommu_domain *domain; - phys_addr_t pgtable; + struct device *sysmmu; /* SYSMMU controller device */ + struct device *master; /* master device (owner) */ + void __iomem *sfrbase; /* our registers */ + struct clk *clk; /* SYSMMU's clock */ + struct clk *clk_master; /* master's device clock */ + int activations; /* number of calls to sysmmu_enable */ + spinlock_t lock; /* lock for modyfying state */ + struct exynos_iommu_domain *domain; /* domain we belong to */ + struct list_head domain_node; /* node for domain clients list */ + struct list_head owner_node; /* node for owner controllers list */ + phys_addr_t pgtable; /* assigned page table structure */ + unsigned int version; /* our version */ }; static struct exynos_iommu_domain *to_exynos_domain(struct iommu_domain *dom) @@ -244,11 +260,6 @@ static void sysmmu_unblock(void __iomem *sfrbase) __raw_writel(CTRL_ENABLE, sfrbase + REG_MMU_CTRL); } -static unsigned int __raw_sysmmu_version(struct sysmmu_drvdata *data) -{ - return MMU_RAW_VER(__raw_readl(data->sfrbase + REG_MMU_VERSION)); -} - static bool sysmmu_block(void __iomem *sfrbase) { int i = 120; @@ -345,7 +356,7 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id) show_fault_information(dev_name(data->sysmmu), itype, base, addr); if (data->domain) - ret = report_iommu_fault(data->domain, + ret = report_iommu_fault(&data->domain->domain, data->master, addr, itype); } @@ -408,7 +419,7 @@ static void __sysmmu_init_config(struct sysmmu_drvdata *data) unsigned int cfg = CFG_LRU | CFG_QOS(15); unsigned int ver; - ver = __raw_sysmmu_version(data); + ver = MMU_RAW_VER(__raw_readl(data->sfrbase + REG_MMU_VERSION)); if (MMU_MAJ_VER(ver) == 3) { if (MMU_MIN_VER(ver) >= 2) { cfg |= CFG_FLPDCACHE; @@ -422,6 +433,7 @@ static void __sysmmu_init_config(struct sysmmu_drvdata *data) } __raw_writel(cfg, data->sfrbase + REG_MMU_CFG); + data->version = ver; } static void __sysmmu_enable_nocount(struct sysmmu_drvdata *data) @@ -442,8 +454,8 @@ static void __sysmmu_enable_nocount(struct sysmmu_drvdata *data) clk_disable(data->clk_master); } -static int __sysmmu_enable(struct sysmmu_drvdata *data, - phys_addr_t pgtable, struct iommu_domain *domain) +static int __sysmmu_enable(struct sysmmu_drvdata *data, phys_addr_t pgtable, + struct exynos_iommu_domain *domain) { int ret = 0; unsigned long flags; @@ -470,77 +482,17 @@ static int __sysmmu_enable(struct sysmmu_drvdata *data, return ret; } -/* __exynos_sysmmu_enable: Enables System MMU - * - * returns -error if an error occurred and System MMU is not enabled, - * 0 if the System MMU has been just enabled and 1 if System MMU was already - * enabled before. - */ -static int __exynos_sysmmu_enable(struct device *dev, phys_addr_t pgtable, - struct iommu_domain *domain) -{ - int ret = 0; - unsigned long flags; - struct exynos_iommu_owner *owner = dev->archdata.iommu; - struct sysmmu_drvdata *data; - - BUG_ON(!has_sysmmu(dev)); - - spin_lock_irqsave(&owner->lock, flags); - - data = dev_get_drvdata(owner->sysmmu); - - ret = __sysmmu_enable(data, pgtable, domain); - if (ret >= 0) - data->master = dev; - - spin_unlock_irqrestore(&owner->lock, flags); - - return ret; -} - -int exynos_sysmmu_enable(struct device *dev, phys_addr_t pgtable) -{ - BUG_ON(!memblock_is_memory(pgtable)); - - return __exynos_sysmmu_enable(dev, pgtable, NULL); -} - -static bool exynos_sysmmu_disable(struct device *dev) -{ - unsigned long flags; - bool disabled = true; - struct exynos_iommu_owner *owner = dev->archdata.iommu; - struct sysmmu_drvdata *data; - - BUG_ON(!has_sysmmu(dev)); - - spin_lock_irqsave(&owner->lock, flags); - - data = dev_get_drvdata(owner->sysmmu); - - disabled = __sysmmu_disable(data); - if (disabled) - data->master = NULL; - - spin_unlock_irqrestore(&owner->lock, flags); - - return disabled; -} - static void __sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, sysmmu_iova_t iova) { - if (__raw_sysmmu_version(data) == MAKE_MMU_VER(3, 3)) + if (data->version == MAKE_MMU_VER(3, 3)) __raw_writel(iova | 0x1, data->sfrbase + REG_MMU_FLUSH_ENTRY); } -static void sysmmu_tlb_invalidate_flpdcache(struct device *dev, +static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, sysmmu_iova_t iova) { unsigned long flags; - struct exynos_iommu_owner *owner = dev->archdata.iommu; - struct sysmmu_drvdata *data = dev_get_drvdata(owner->sysmmu); if (!IS_ERR(data->clk_master)) clk_enable(data->clk_master); @@ -554,14 +506,10 @@ static void sysmmu_tlb_invalidate_flpdcache(struct device *dev, clk_disable(data->clk_master); } -static void sysmmu_tlb_invalidate_entry(struct device *dev, sysmmu_iova_t iova, - size_t size) +static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data, + sysmmu_iova_t iova, size_t size) { - struct exynos_iommu_owner *owner = dev->archdata.iommu; unsigned long flags; - struct sysmmu_drvdata *data; - - data = dev_get_drvdata(owner->sysmmu); spin_lock_irqsave(&data->lock, flags); if (is_sysmmu_active(data)) { @@ -580,7 +528,7 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, sysmmu_iova_t iova, * 1MB page can be cached in one of all sets. * 64KB page can be one of 16 consecutive sets. */ - if (MMU_MAJ_VER(__raw_sysmmu_version(data)) == 2) + if (MMU_MAJ_VER(data->version) == 2) num_inv = min_t(unsigned int, size / PAGE_SIZE, 64); if (sysmmu_block(data->sfrbase)) { @@ -591,32 +539,8 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, sysmmu_iova_t iova, if (!IS_ERR(data->clk_master)) clk_disable(data->clk_master); } else { - dev_dbg(dev, "disabled. Skipping TLB invalidation @ %#x\n", - iova); - } - spin_unlock_irqrestore(&data->lock, flags); -} - -void exynos_sysmmu_tlb_invalidate(struct device *dev) -{ - struct exynos_iommu_owner *owner = dev->archdata.iommu; - unsigned long flags; - struct sysmmu_drvdata *data; - - data = dev_get_drvdata(owner->sysmmu); - - spin_lock_irqsave(&data->lock, flags); - if (is_sysmmu_active(data)) { - if (!IS_ERR(data->clk_master)) - clk_enable(data->clk_master); - if (sysmmu_block(data->sfrbase)) { - __sysmmu_tlb_invalidate(data->sfrbase); - sysmmu_unblock(data->sfrbase); - } - if (!IS_ERR(data->clk_master)) - clk_disable(data->clk_master); - } else { - dev_dbg(dev, "disabled. Skipping TLB invalidation\n"); + dev_dbg(data->master, + "disabled. Skipping TLB invalidation @ %#x\n", iova); } spin_unlock_irqrestore(&data->lock, flags); } @@ -682,6 +606,36 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int exynos_sysmmu_suspend(struct device *dev) +{ + struct sysmmu_drvdata *data = dev_get_drvdata(dev); + + dev_dbg(dev, "suspend\n"); + if (is_sysmmu_active(data)) { + __sysmmu_disable_nocount(data); + pm_runtime_put(dev); + } + return 0; +} + +static int exynos_sysmmu_resume(struct device *dev) +{ + struct sysmmu_drvdata *data = dev_get_drvdata(dev); + + dev_dbg(dev, "resume\n"); + if (is_sysmmu_active(data)) { + pm_runtime_get_sync(dev); + __sysmmu_enable_nocount(data); + } + return 0; +} +#endif + +static const struct dev_pm_ops sysmmu_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(exynos_sysmmu_suspend, exynos_sysmmu_resume) +}; + static const struct of_device_id sysmmu_of_match[] __initconst = { { .compatible = "samsung,exynos-sysmmu", }, { }, @@ -692,6 +646,7 @@ static struct platform_driver exynos_sysmmu_driver __refdata = { .driver = { .name = "exynos-sysmmu", .of_match_table = sysmmu_of_match, + .pm = &sysmmu_pm_ops, } }; @@ -704,104 +659,108 @@ static inline void pgtable_flush(void *vastart, void *vaend) static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type) { - struct exynos_iommu_domain *exynos_domain; + struct exynos_iommu_domain *domain; int i; if (type != IOMMU_DOMAIN_UNMANAGED) return NULL; - exynos_domain = kzalloc(sizeof(*exynos_domain), GFP_KERNEL); - if (!exynos_domain) + domain = kzalloc(sizeof(*domain), GFP_KERNEL); + if (!domain) return NULL; - exynos_domain->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2); - if (!exynos_domain->pgtable) + domain->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2); + if (!domain->pgtable) goto err_pgtable; - exynos_domain->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1); - if (!exynos_domain->lv2entcnt) + domain->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1); + if (!domain->lv2entcnt) goto err_counter; /* Workaround for System MMU v3.3 to prevent caching 1MiB mapping */ for (i = 0; i < NUM_LV1ENTRIES; i += 8) { - exynos_domain->pgtable[i + 0] = ZERO_LV2LINK; - exynos_domain->pgtable[i + 1] = ZERO_LV2LINK; - exynos_domain->pgtable[i + 2] = ZERO_LV2LINK; - exynos_domain->pgtable[i + 3] = ZERO_LV2LINK; - exynos_domain->pgtable[i + 4] = ZERO_LV2LINK; - exynos_domain->pgtable[i + 5] = ZERO_LV2LINK; - exynos_domain->pgtable[i + 6] = ZERO_LV2LINK; - exynos_domain->pgtable[i + 7] = ZERO_LV2LINK; + domain->pgtable[i + 0] = ZERO_LV2LINK; + domain->pgtable[i + 1] = ZERO_LV2LINK; + domain->pgtable[i + 2] = ZERO_LV2LINK; + domain->pgtable[i + 3] = ZERO_LV2LINK; + domain->pgtable[i + 4] = ZERO_LV2LINK; + domain->pgtable[i + 5] = ZERO_LV2LINK; + domain->pgtable[i + 6] = ZERO_LV2LINK; + domain->pgtable[i + 7] = ZERO_LV2LINK; } - pgtable_flush(exynos_domain->pgtable, exynos_domain->pgtable + NUM_LV1ENTRIES); + pgtable_flush(domain->pgtable, domain->pgtable + NUM_LV1ENTRIES); - spin_lock_init(&exynos_domain->lock); - spin_lock_init(&exynos_domain->pgtablelock); - INIT_LIST_HEAD(&exynos_domain->clients); + spin_lock_init(&domain->lock); + spin_lock_init(&domain->pgtablelock); + INIT_LIST_HEAD(&domain->clients); - exynos_domain->domain.geometry.aperture_start = 0; - exynos_domain->domain.geometry.aperture_end = ~0UL; - exynos_domain->domain.geometry.force_aperture = true; + domain->domain.geometry.aperture_start = 0; + domain->domain.geometry.aperture_end = ~0UL; + domain->domain.geometry.force_aperture = true; - return &exynos_domain->domain; + return &domain->domain; err_counter: - free_pages((unsigned long)exynos_domain->pgtable, 2); + free_pages((unsigned long)domain->pgtable, 2); err_pgtable: - kfree(exynos_domain); + kfree(domain); return NULL; } -static void exynos_iommu_domain_free(struct iommu_domain *domain) +static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain) { - struct exynos_iommu_domain *priv = to_exynos_domain(domain); - struct exynos_iommu_owner *owner; + struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); + struct sysmmu_drvdata *data, *next; unsigned long flags; int i; - WARN_ON(!list_empty(&priv->clients)); + WARN_ON(!list_empty(&domain->clients)); - spin_lock_irqsave(&priv->lock, flags); + spin_lock_irqsave(&domain->lock, flags); - list_for_each_entry(owner, &priv->clients, client) { - while (!exynos_sysmmu_disable(owner->dev)) - ; /* until System MMU is actually disabled */ + list_for_each_entry_safe(data, next, &domain->clients, domain_node) { + if (__sysmmu_disable(data)) + data->master = NULL; + list_del_init(&data->domain_node); } - while (!list_empty(&priv->clients)) - list_del_init(priv->clients.next); - - spin_unlock_irqrestore(&priv->lock, flags); + spin_unlock_irqrestore(&domain->lock, flags); for (i = 0; i < NUM_LV1ENTRIES; i++) - if (lv1ent_page(priv->pgtable + i)) + if (lv1ent_page(domain->pgtable + i)) kmem_cache_free(lv2table_kmem_cache, - phys_to_virt(lv2table_base(priv->pgtable + i))); + phys_to_virt(lv2table_base(domain->pgtable + i))); - free_pages((unsigned long)priv->pgtable, 2); - free_pages((unsigned long)priv->lv2entcnt, 1); - kfree(priv); + free_pages((unsigned long)domain->pgtable, 2); + free_pages((unsigned long)domain->lv2entcnt, 1); + kfree(domain); } -static int exynos_iommu_attach_device(struct iommu_domain *domain, +static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain, struct device *dev) { struct exynos_iommu_owner *owner = dev->archdata.iommu; - struct exynos_iommu_domain *priv = to_exynos_domain(domain); - phys_addr_t pagetable = virt_to_phys(priv->pgtable); + struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); + struct sysmmu_drvdata *data; + phys_addr_t pagetable = virt_to_phys(domain->pgtable); unsigned long flags; - int ret; + int ret = -ENODEV; - spin_lock_irqsave(&priv->lock, flags); + if (!has_sysmmu(dev)) + return -ENODEV; - ret = __exynos_sysmmu_enable(dev, pagetable, domain); - if (ret == 0) { - list_add_tail(&owner->client, &priv->clients); - owner->domain = domain; - } + list_for_each_entry(data, &owner->controllers, owner_node) { + pm_runtime_get_sync(data->sysmmu); + ret = __sysmmu_enable(data, pagetable, domain); + if (ret >= 0) { + data->master = dev; - spin_unlock_irqrestore(&priv->lock, flags); + spin_lock_irqsave(&domain->lock, flags); + list_add_tail(&data->domain_node, &domain->clients); + spin_unlock_irqrestore(&domain->lock, flags); + } + } if (ret < 0) { dev_err(dev, "%s: Failed to attach IOMMU with pgtable %pa\n", @@ -815,36 +774,39 @@ static int exynos_iommu_attach_device(struct iommu_domain *domain, return ret; } -static void exynos_iommu_detach_device(struct iommu_domain *domain, +static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain, struct device *dev) { - struct exynos_iommu_owner *owner; - struct exynos_iommu_domain *priv = to_exynos_domain(domain); - phys_addr_t pagetable = virt_to_phys(priv->pgtable); + struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); + phys_addr_t pagetable = virt_to_phys(domain->pgtable); + struct sysmmu_drvdata *data, *next; unsigned long flags; + bool found = false; - spin_lock_irqsave(&priv->lock, flags); + if (!has_sysmmu(dev)) + return; - list_for_each_entry(owner, &priv->clients, client) { - if (owner == dev->archdata.iommu) { - if (exynos_sysmmu_disable(dev)) { - list_del_init(&owner->client); - owner->domain = NULL; + spin_lock_irqsave(&domain->lock, flags); + list_for_each_entry_safe(data, next, &domain->clients, domain_node) { + if (data->master == dev) { + if (__sysmmu_disable(data)) { + data->master = NULL; + list_del_init(&data->domain_node); } - break; + pm_runtime_put(data->sysmmu); + found = true; } } + spin_unlock_irqrestore(&domain->lock, flags); - spin_unlock_irqrestore(&priv->lock, flags); - - if (owner == dev->archdata.iommu) + if (found) dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n", __func__, &pagetable); else dev_err(dev, "%s: No IOMMU is attached\n", __func__); } -static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *priv, +static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *domain, sysmmu_pte_t *sent, sysmmu_iova_t iova, short *pgcounter) { if (lv1ent_section(sent)) { @@ -862,6 +824,7 @@ static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *priv, return ERR_PTR(-ENOMEM); *sent = mk_lv1ent_page(virt_to_phys(pent)); + kmemleak_ignore(pent); *pgcounter = NUM_LV2ENTRIES; pgtable_flush(pent, pent + NUM_LV2ENTRIES); pgtable_flush(sent, sent + 1); @@ -884,20 +847,19 @@ static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *priv, * not currently mapped. */ if (need_flush_flpd_cache) { - struct exynos_iommu_owner *owner; + struct sysmmu_drvdata *data; - spin_lock(&priv->lock); - list_for_each_entry(owner, &priv->clients, client) - sysmmu_tlb_invalidate_flpdcache( - owner->dev, iova); - spin_unlock(&priv->lock); + spin_lock(&domain->lock); + list_for_each_entry(data, &domain->clients, domain_node) + sysmmu_tlb_invalidate_flpdcache(data, iova); + spin_unlock(&domain->lock); } } return page_entry(sent, iova); } -static int lv1set_section(struct exynos_iommu_domain *priv, +static int lv1set_section(struct exynos_iommu_domain *domain, sysmmu_pte_t *sent, sysmmu_iova_t iova, phys_addr_t paddr, short *pgcnt) { @@ -922,17 +884,17 @@ static int lv1set_section(struct exynos_iommu_domain *priv, pgtable_flush(sent, sent + 1); - spin_lock(&priv->lock); + spin_lock(&domain->lock); if (lv1ent_page_zero(sent)) { - struct exynos_iommu_owner *owner; + struct sysmmu_drvdata *data; /* * Flushing FLPD cache in System MMU v3.3 that may cache a FLPD * entry by speculative prefetch of SLPD which has no mapping. */ - list_for_each_entry(owner, &priv->clients, client) - sysmmu_tlb_invalidate_flpdcache(owner->dev, iova); + list_for_each_entry(data, &domain->clients, domain_node) + sysmmu_tlb_invalidate_flpdcache(data, iova); } - spin_unlock(&priv->lock); + spin_unlock(&domain->lock); return 0; } @@ -992,74 +954,75 @@ static int lv2set_page(sysmmu_pte_t *pent, phys_addr_t paddr, size_t size, * than or equal to 128KiB. * - Start address of an I/O virtual region must be aligned by 128KiB. */ -static int exynos_iommu_map(struct iommu_domain *domain, unsigned long l_iova, - phys_addr_t paddr, size_t size, int prot) +static int exynos_iommu_map(struct iommu_domain *iommu_domain, + unsigned long l_iova, phys_addr_t paddr, size_t size, + int prot) { - struct exynos_iommu_domain *priv = to_exynos_domain(domain); + struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); sysmmu_pte_t *entry; sysmmu_iova_t iova = (sysmmu_iova_t)l_iova; unsigned long flags; int ret = -ENOMEM; - BUG_ON(priv->pgtable == NULL); + BUG_ON(domain->pgtable == NULL); - spin_lock_irqsave(&priv->pgtablelock, flags); + spin_lock_irqsave(&domain->pgtablelock, flags); - entry = section_entry(priv->pgtable, iova); + entry = section_entry(domain->pgtable, iova); if (size == SECT_SIZE) { - ret = lv1set_section(priv, entry, iova, paddr, - &priv->lv2entcnt[lv1ent_offset(iova)]); + ret = lv1set_section(domain, entry, iova, paddr, + &domain->lv2entcnt[lv1ent_offset(iova)]); } else { sysmmu_pte_t *pent; - pent = alloc_lv2entry(priv, entry, iova, - &priv->lv2entcnt[lv1ent_offset(iova)]); + pent = alloc_lv2entry(domain, entry, iova, + &domain->lv2entcnt[lv1ent_offset(iova)]); if (IS_ERR(pent)) ret = PTR_ERR(pent); else ret = lv2set_page(pent, paddr, size, - &priv->lv2entcnt[lv1ent_offset(iova)]); + &domain->lv2entcnt[lv1ent_offset(iova)]); } if (ret) pr_err("%s: Failed(%d) to map %#zx bytes @ %#x\n", __func__, ret, size, iova); - spin_unlock_irqrestore(&priv->pgtablelock, flags); + spin_unlock_irqrestore(&domain->pgtablelock, flags); return ret; } -static void exynos_iommu_tlb_invalidate_entry(struct exynos_iommu_domain *priv, - sysmmu_iova_t iova, size_t size) +static void exynos_iommu_tlb_invalidate_entry(struct exynos_iommu_domain *domain, + sysmmu_iova_t iova, size_t size) { - struct exynos_iommu_owner *owner; + struct sysmmu_drvdata *data; unsigned long flags; - spin_lock_irqsave(&priv->lock, flags); + spin_lock_irqsave(&domain->lock, flags); - list_for_each_entry(owner, &priv->clients, client) - sysmmu_tlb_invalidate_entry(owner->dev, iova, size); + list_for_each_entry(data, &domain->clients, domain_node) + sysmmu_tlb_invalidate_entry(data, iova, size); - spin_unlock_irqrestore(&priv->lock, flags); + spin_unlock_irqrestore(&domain->lock, flags); } -static size_t exynos_iommu_unmap(struct iommu_domain *domain, - unsigned long l_iova, size_t size) +static size_t exynos_iommu_unmap(struct iommu_domain *iommu_domain, + unsigned long l_iova, size_t size) { - struct exynos_iommu_domain *priv = to_exynos_domain(domain); + struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); sysmmu_iova_t iova = (sysmmu_iova_t)l_iova; sysmmu_pte_t *ent; size_t err_pgsize; unsigned long flags; - BUG_ON(priv->pgtable == NULL); + BUG_ON(domain->pgtable == NULL); - spin_lock_irqsave(&priv->pgtablelock, flags); + spin_lock_irqsave(&domain->pgtablelock, flags); - ent = section_entry(priv->pgtable, iova); + ent = section_entry(domain->pgtable, iova); if (lv1ent_section(ent)) { if (WARN_ON(size < SECT_SIZE)) { @@ -1093,7 +1056,7 @@ static size_t exynos_iommu_unmap(struct iommu_domain *domain, *ent = 0; size = SPAGE_SIZE; pgtable_flush(ent, ent + 1); - priv->lv2entcnt[lv1ent_offset(iova)] += 1; + domain->lv2entcnt[lv1ent_offset(iova)] += 1; goto done; } @@ -1107,15 +1070,15 @@ static size_t exynos_iommu_unmap(struct iommu_domain *domain, pgtable_flush(ent, ent + SPAGES_PER_LPAGE); size = LPAGE_SIZE; - priv->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE; + domain->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE; done: - spin_unlock_irqrestore(&priv->pgtablelock, flags); + spin_unlock_irqrestore(&domain->pgtablelock, flags); - exynos_iommu_tlb_invalidate_entry(priv, iova, size); + exynos_iommu_tlb_invalidate_entry(domain, iova, size); return size; err: - spin_unlock_irqrestore(&priv->pgtablelock, flags); + spin_unlock_irqrestore(&domain->pgtablelock, flags); pr_err("%s: Failed: size(%#zx) @ %#x is smaller than page size %#zx\n", __func__, size, iova, err_pgsize); @@ -1123,17 +1086,17 @@ err: return 0; } -static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *domain, +static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *iommu_domain, dma_addr_t iova) { - struct exynos_iommu_domain *priv = to_exynos_domain(domain); + struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); sysmmu_pte_t *entry; unsigned long flags; phys_addr_t phys = 0; - spin_lock_irqsave(&priv->pgtablelock, flags); + spin_lock_irqsave(&domain->pgtablelock, flags); - entry = section_entry(priv->pgtable, iova); + entry = section_entry(domain->pgtable, iova); if (lv1ent_section(entry)) { phys = section_phys(entry) + section_offs(iova); @@ -1146,7 +1109,7 @@ static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *domain, phys = spage_phys(entry) + spage_offs(iova); } - spin_unlock_irqrestore(&priv->pgtablelock, flags); + spin_unlock_irqrestore(&domain->pgtablelock, flags); return phys; } @@ -1156,6 +1119,9 @@ static int exynos_iommu_add_device(struct device *dev) struct iommu_group *group; int ret; + if (!has_sysmmu(dev)) + return -ENODEV; + group = iommu_group_get(dev); if (!group) { @@ -1174,10 +1140,40 @@ static int exynos_iommu_add_device(struct device *dev) static void exynos_iommu_remove_device(struct device *dev) { + if (!has_sysmmu(dev)) + return; + iommu_group_remove_device(dev); } -static const struct iommu_ops exynos_iommu_ops = { +static int exynos_iommu_of_xlate(struct device *dev, + struct of_phandle_args *spec) +{ + struct exynos_iommu_owner *owner = dev->archdata.iommu; + struct platform_device *sysmmu = of_find_device_by_node(spec->np); + struct sysmmu_drvdata *data; + + if (!sysmmu) + return -ENODEV; + + data = platform_get_drvdata(sysmmu); + if (!data) + return -ENODEV; + + if (!owner) { + owner = kzalloc(sizeof(*owner), GFP_KERNEL); + if (!owner) + return -ENOMEM; + + INIT_LIST_HEAD(&owner->controllers); + dev->archdata.iommu = owner; + } + + list_add_tail(&data->owner_node, &owner->controllers); + return 0; +} + +static struct iommu_ops exynos_iommu_ops = { .domain_alloc = exynos_iommu_domain_alloc, .domain_free = exynos_iommu_domain_free, .attach_dev = exynos_iommu_attach_device, @@ -1189,19 +1185,15 @@ static const struct iommu_ops exynos_iommu_ops = { .add_device = exynos_iommu_add_device, .remove_device = exynos_iommu_remove_device, .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE, + .of_xlate = exynos_iommu_of_xlate, }; +static bool init_done; + static int __init exynos_iommu_init(void) { - struct device_node *np; int ret; - np = of_find_matching_node(NULL, sysmmu_of_match); - if (!np) - return 0; - - of_node_put(np); - lv2table_kmem_cache = kmem_cache_create("exynos-iommu-lv2table", LV2TABLE_SIZE, LV2TABLE_SIZE, 0, NULL); if (!lv2table_kmem_cache) { @@ -1230,6 +1222,8 @@ static int __init exynos_iommu_init(void) goto err_set_iommu; } + init_done = true; + return 0; err_set_iommu: kmem_cache_free(lv2table_kmem_cache, zero_lv2_table); @@ -1239,4 +1233,21 @@ err_reg_driver: kmem_cache_destroy(lv2table_kmem_cache); return ret; } -subsys_initcall(exynos_iommu_init); + +static int __init exynos_iommu_of_setup(struct device_node *np) +{ + struct platform_device *pdev; + + if (!init_done) + exynos_iommu_init(); + + pdev = of_platform_device_create(np, NULL, platform_bus_type.dev_root); + if (IS_ERR(pdev)) + return PTR_ERR(pdev); + + of_iommu_set_ops(np, &exynos_iommu_ops); + return 0; +} + +IOMMU_OF_DECLARE(exynos_iommu_of, "samsung,exynos-sysmmu", + exynos_iommu_of_setup); |