diff options
| -rw-r--r-- | drivers/iommu/tegra-gart.c | 253 |
1 files changed, 105 insertions, 148 deletions
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c index ad348c61d5e7..4d8057916552 100644 --- a/drivers/iommu/tegra-gart.c +++ b/drivers/iommu/tegra-gart.c @@ -1,5 +1,5 @@ /* - * IOMMU API for GART in Tegra20 + * IOMMU API for Graphics Address Relocation Table on Tegra20 * * Copyright (c) 2010-2012, NVIDIA CORPORATION. All rights reserved. * @@ -31,70 +31,63 @@ #include <soc/tegra/mc.h> -/* bitmap of the page sizes currently supported */ -#define GART_IOMMU_PGSIZES (SZ_4K) - #define GART_REG_BASE 0x24 #define GART_CONFIG (0x24 - GART_REG_BASE) #define GART_ENTRY_ADDR (0x28 - GART_REG_BASE) #define GART_ENTRY_DATA (0x2c - GART_REG_BASE) -#define GART_ENTRY_PHYS_ADDR_VALID (1 << 31) + +#define GART_ENTRY_PHYS_ADDR_VALID BIT(31) #define GART_PAGE_SHIFT 12 #define GART_PAGE_SIZE (1 << GART_PAGE_SHIFT) -#define GART_PAGE_MASK \ - (~(GART_PAGE_SIZE - 1) & ~GART_ENTRY_PHYS_ADDR_VALID) +#define GART_PAGE_MASK GENMASK(30, GART_PAGE_SHIFT) + +/* bitmap of the page sizes currently supported */ +#define GART_IOMMU_PGSIZES (GART_PAGE_SIZE) struct gart_device { void __iomem *regs; u32 *savedata; - u32 page_count; /* total remappable size */ - dma_addr_t iovmm_base; /* offset to vmm_area */ + unsigned long iovmm_base; /* offset to vmm_area start */ + unsigned long iovmm_end; /* offset to vmm_area end */ spinlock_t pte_lock; /* for pagetable */ spinlock_t dom_lock; /* for active domain */ unsigned int active_devices; /* number of active devices */ struct iommu_domain *active_domain; /* current active domain */ - struct device *dev; - struct iommu_device iommu; /* IOMMU Core handle */ + struct device *dev; }; static struct gart_device *gart_handle; /* unique for a system */ static bool gart_debug; -#define GART_PTE(_pfn) \ - (GART_ENTRY_PHYS_ADDR_VALID | ((_pfn) << PAGE_SHIFT)) - /* * Any interaction between any block on PPSB and a block on APB or AHB * must have these read-back to ensure the APB/AHB bus transaction is * complete before initiating activity on the PPSB block. */ -#define FLUSH_GART_REGS(gart) ((void)readl((gart)->regs + GART_CONFIG)) +#define FLUSH_GART_REGS(gart) readl_relaxed((gart)->regs + GART_CONFIG) #define for_each_gart_pte(gart, iova) \ for (iova = gart->iovmm_base; \ - iova < gart->iovmm_base + GART_PAGE_SIZE * gart->page_count; \ + iova < gart->iovmm_end; \ iova += GART_PAGE_SIZE) static inline void gart_set_pte(struct gart_device *gart, - unsigned long offs, u32 pte) + unsigned long iova, unsigned long pte) { - writel(offs, gart->regs + GART_ENTRY_ADDR); - writel(pte, gart->regs + GART_ENTRY_DATA); - - dev_dbg(gart->dev, "%s %08lx:%08x\n", - pte ? "map" : "unmap", offs, pte & GART_PAGE_MASK); + writel_relaxed(iova, gart->regs + GART_ENTRY_ADDR); + writel_relaxed(pte, gart->regs + GART_ENTRY_DATA); } static inline unsigned long gart_read_pte(struct gart_device *gart, - unsigned long offs) + unsigned long iova) { unsigned long pte; - writel(offs, gart->regs + GART_ENTRY_ADDR); - pte = readl(gart->regs + GART_ENTRY_DATA); + writel_relaxed(iova, gart->regs + GART_ENTRY_ADDR); + pte = readl_relaxed(gart->regs + GART_ENTRY_DATA); return pte; } @@ -106,49 +99,20 @@ static void do_gart_setup(struct gart_device *gart, const u32 *data) for_each_gart_pte(gart, iova) gart_set_pte(gart, iova, data ? *(data++) : 0); - writel(1, gart->regs + GART_CONFIG); + writel_relaxed(1, gart->regs + GART_CONFIG); FLUSH_GART_REGS(gart); } -#ifdef DEBUG -static void gart_dump_table(struct gart_device *gart) -{ - unsigned long iova; - unsigned long flags; - - spin_lock_irqsave(&gart->pte_lock, flags); - for_each_gart_pte(gart, iova) { - unsigned long pte; - - pte = gart_read_pte(gart, iova); - - dev_dbg(gart->dev, "%s %08lx:%08lx\n", - (GART_ENTRY_PHYS_ADDR_VALID & pte) ? "v" : " ", - iova, pte & GART_PAGE_MASK); - } - spin_unlock_irqrestore(&gart->pte_lock, flags); -} -#else -static inline void gart_dump_table(struct gart_device *gart) +static inline bool gart_iova_range_invalid(struct gart_device *gart, + unsigned long iova, size_t bytes) { + return unlikely(iova < gart->iovmm_base || bytes != GART_PAGE_SIZE || + iova + bytes > gart->iovmm_end); } -#endif -static inline bool gart_iova_range_valid(struct gart_device *gart, - unsigned long iova, size_t bytes) +static inline bool gart_pte_valid(struct gart_device *gart, unsigned long iova) { - unsigned long iova_start, iova_end, gart_start, gart_end; - - iova_start = iova; - iova_end = iova_start + bytes - 1; - gart_start = gart->iovmm_base; - gart_end = gart_start + gart->page_count * GART_PAGE_SIZE - 1; - - if (iova_start < gart_start) - return false; - if (iova_end > gart_end) - return false; - return true; + return !!(gart_read_pte(gart, iova) & GART_ENTRY_PHYS_ADDR_VALID); } static int gart_iommu_attach_dev(struct iommu_domain *domain, @@ -191,7 +155,6 @@ static void gart_iommu_detach_dev(struct iommu_domain *domain, static struct iommu_domain *gart_iommu_domain_alloc(unsigned type) { - struct gart_device *gart = gart_handle; struct iommu_domain *domain; if (type != IOMMU_DOMAIN_UNMANAGED) @@ -199,9 +162,8 @@ static struct iommu_domain *gart_iommu_domain_alloc(unsigned type) domain = kzalloc(sizeof(*domain), GFP_KERNEL); if (domain) { - domain->geometry.aperture_start = gart->iovmm_base; - domain->geometry.aperture_end = gart->iovmm_base + - gart->page_count * GART_PAGE_SIZE - 1; + domain->geometry.aperture_start = gart_handle->iovmm_base; + domain->geometry.aperture_end = gart_handle->iovmm_end - 1; domain->geometry.force_aperture = true; } @@ -214,34 +176,45 @@ static void gart_iommu_domain_free(struct iommu_domain *domain) kfree(domain); } +static inline int __gart_iommu_map(struct gart_device *gart, unsigned long iova, + unsigned long pa) +{ + if (unlikely(gart_debug && gart_pte_valid(gart, iova))) { + dev_err(gart->dev, "Page entry is in-use\n"); + return -EINVAL; + } + + gart_set_pte(gart, iova, GART_ENTRY_PHYS_ADDR_VALID | pa); + + return 0; +} + static int gart_iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t pa, size_t bytes, int prot) { struct gart_device *gart = gart_handle; - unsigned long flags; - unsigned long pfn; - unsigned long pte; + int ret; - if (!gart_iova_range_valid(gart, iova, bytes)) + if (gart_iova_range_invalid(gart, iova, bytes)) return -EINVAL; - spin_lock_irqsave(&gart->pte_lock, flags); - pfn = __phys_to_pfn(pa); - if (!pfn_valid(pfn)) { - dev_err(gart->dev, "Invalid page: %pa\n", &pa); - spin_unlock_irqrestore(&gart->pte_lock, flags); + spin_lock(&gart->pte_lock); + ret = __gart_iommu_map(gart, iova, (unsigned long)pa); + spin_unlock(&gart->pte_lock); + + return ret; +} + +static inline int __gart_iommu_unmap(struct gart_device *gart, + unsigned long iova) +{ + if (unlikely(gart_debug && !gart_pte_valid(gart, iova))) { + dev_err(gart->dev, "Page entry is invalid\n"); return -EINVAL; } - if (gart_debug) { - pte = gart_read_pte(gart, iova); - if (pte & GART_ENTRY_PHYS_ADDR_VALID) { - spin_unlock_irqrestore(&gart->pte_lock, flags); - dev_err(gart->dev, "Page entry is in-use\n"); - return -EBUSY; - } - } - gart_set_pte(gart, iova, GART_PTE(pfn)); - spin_unlock_irqrestore(&gart->pte_lock, flags); + + gart_set_pte(gart, iova, 0); + return 0; } @@ -249,15 +222,16 @@ static size_t gart_iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t bytes) { struct gart_device *gart = gart_handle; - unsigned long flags; + int err; - if (!gart_iova_range_valid(gart, iova, bytes)) + if (gart_iova_range_invalid(gart, iova, bytes)) return 0; - spin_lock_irqsave(&gart->pte_lock, flags); - gart_set_pte(gart, iova, 0); - spin_unlock_irqrestore(&gart->pte_lock, flags); - return bytes; + spin_lock(&gart->pte_lock); + err = __gart_iommu_unmap(gart, iova); + spin_unlock(&gart->pte_lock); + + return err ? 0 : bytes; } static phys_addr_t gart_iommu_iova_to_phys(struct iommu_domain *domain, @@ -265,24 +239,15 @@ static phys_addr_t gart_iommu_iova_to_phys(struct iommu_domain *domain, { struct gart_device *gart = gart_handle; unsigned long pte; - phys_addr_t pa; - unsigned long flags; - if (!gart_iova_range_valid(gart, iova, 0)) + if (gart_iova_range_invalid(gart, iova, GART_PAGE_SIZE)) return -EINVAL; - spin_lock_irqsave(&gart->pte_lock, flags); + spin_lock(&gart->pte_lock); pte = gart_read_pte(gart, iova); - spin_unlock_irqrestore(&gart->pte_lock, flags); + spin_unlock(&gart->pte_lock); - pa = (pte & GART_PAGE_MASK); - if (!pfn_valid(__phys_to_pfn(pa))) { - dev_err(gart->dev, "No entry for %08llx:%pa\n", - (unsigned long long)iova, &pa); - gart_dump_table(gart); - return -EINVAL; - } - return pa; + return pte & GART_PAGE_MASK; } static bool gart_iommu_capable(enum iommu_cap cap) @@ -322,9 +287,7 @@ static int gart_iommu_of_xlate(struct device *dev, static void gart_iommu_sync(struct iommu_domain *domain) { - struct gart_device *gart = gart_handle; - - FLUSH_GART_REGS(gart); + FLUSH_GART_REGS(gart_handle); } static const struct iommu_ops gart_iommu_ops = { @@ -347,84 +310,78 @@ static const struct iommu_ops gart_iommu_ops = { int tegra_gart_suspend(struct gart_device *gart) { - unsigned long iova; u32 *data = gart->savedata; - unsigned long flags; + unsigned long iova; + + /* + * All GART users shall be suspended at this point. Disable + * address translation to trap all GART accesses as invalid + * memory accesses. + */ + writel_relaxed(0, gart->regs + GART_CONFIG); + FLUSH_GART_REGS(gart); - spin_lock_irqsave(&gart->pte_lock, flags); for_each_gart_pte(gart, iova) *(data++) = gart_read_pte(gart, iova); - spin_unlock_irqrestore(&gart->pte_lock, flags); + return 0; } int tegra_gart_resume(struct gart_device *gart) { - unsigned long flags; - - spin_lock_irqsave(&gart->pte_lock, flags); do_gart_setup(gart, gart->savedata); - spin_unlock_irqrestore(&gart->pte_lock, flags); + return 0; } struct gart_device *tegra_gart_probe(struct device *dev, struct tegra_mc *mc) { struct gart_device *gart; - struct resource *res_remap; - void __iomem *gart_regs; - int ret; + struct resource *res; + int err; BUILD_BUG_ON(PAGE_SHIFT != GART_PAGE_SHIFT); /* the GART memory aperture is required */ - res_remap = platform_get_resource(to_platform_device(dev), - IORESOURCE_MEM, 1); - if (!res_remap) { - dev_err(dev, "GART memory aperture expected\n"); + res = platform_get_resource(to_platform_device(dev), IORESOURCE_MEM, 1); + if (!res) { + dev_err(dev, "Memory aperture resource unavailable\n"); return ERR_PTR(-ENXIO); } gart = kzalloc(sizeof(*gart), GFP_KERNEL); - if (!gart) { - dev_err(dev, "failed to allocate gart_device\n"); + if (!gart) return ERR_PTR(-ENOMEM); - } - ret = iommu_device_sysfs_add(&gart->iommu, dev, NULL, "gart"); - if (ret) { - dev_err(dev, "Failed to register IOMMU in sysfs\n"); + gart_handle = gart; + + gart->dev = dev; + gart->regs = mc->regs + GART_REG_BASE; + gart->iovmm_base = res->start; + gart->iovmm_end = res->end + 1; + spin_lock_init(&gart->pte_lock); + spin_lock_init(&gart->dom_lock); + + do_gart_setup(gart, NULL); + + err = iommu_device_sysfs_add(&gart->iommu, dev, NULL, "gart"); + if (err) goto free_gart; - } iommu_device_set_ops(&gart->iommu, &gart_iommu_ops); iommu_device_set_fwnode(&gart->iommu, dev->fwnode); - ret = iommu_device_register(&gart->iommu); - if (ret) { - dev_err(dev, "Failed to register IOMMU\n"); + err = iommu_device_register(&gart->iommu); + if (err) goto remove_sysfs; - } - gart->dev = dev; - gart_regs = mc->regs + GART_REG_BASE; - spin_lock_init(&gart->pte_lock); - spin_lock_init(&gart->dom_lock); - gart->regs = gart_regs; - gart->iovmm_base = (dma_addr_t)res_remap->start; - gart->page_count = (resource_size(res_remap) >> GART_PAGE_SHIFT); - - gart->savedata = vmalloc(array_size(sizeof(u32), gart->page_count)); + gart->savedata = vmalloc(resource_size(res) / GART_PAGE_SIZE * + sizeof(u32)); if (!gart->savedata) { - dev_err(dev, "failed to allocate context save area\n"); - ret = -ENOMEM; + err = -ENOMEM; goto unregister_iommu; } - do_gart_setup(gart, NULL); - - gart_handle = gart; - return gart; unregister_iommu: @@ -434,7 +391,7 @@ remove_sysfs: free_gart: kfree(gart); - return ERR_PTR(ret); + return ERR_PTR(err); } module_param(gart_debug, bool, 0644); |