| Message ID | 1391716317-20300-1-git-send-email-olof@lixom.net (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
2014-02-07 Olof Johansson <olof@lixom.net>: > The driver has been unbuildable due to unfulfilled dependencies since > 3.11, and even if enabled it won't build due to build breakage. Emails > about status on this have gone unanswered, and fixes seem to have been > abandoned. > > It's obvious that nobody cares about it, so let's remove it. Wait, we are going to fix up this module. It seems that KyoungHo, original author, is busy with some works related to product. we can care about it if KyoungHo cannot afford to care for the time being. Thanks, Inki Dae > > Signed-off-by: Olof Johansson <olof@lixom.net> > --- > drivers/iommu/Kconfig | 21 - > drivers/iommu/Makefile | 1 - > drivers/iommu/exynos-iommu.c | 1035 ------------------------------------------ > 3 files changed, 1057 deletions(-) > delete mode 100644 drivers/iommu/exynos-iommu.c > > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig > index 79bbc21..b893367 100644 > --- a/drivers/iommu/Kconfig > +++ b/drivers/iommu/Kconfig > @@ -176,27 +176,6 @@ config TEGRA_IOMMU_SMMU > space through the SMMU (System Memory Management Unit) > hardware included on Tegra SoCs. > > -config EXYNOS_IOMMU > - bool "Exynos IOMMU Support" > - depends on ARCH_EXYNOS && EXYNOS_DEV_SYSMMU > - select IOMMU_API > - help > - Support for the IOMMU(System MMU) of Samsung Exynos application > - processor family. This enables H/W multimedia accellerators to see > - non-linear physical memory chunks as a linear memory in their > - address spaces > - > - If unsure, say N here. > - > -config EXYNOS_IOMMU_DEBUG > - bool "Debugging log for Exynos IOMMU" > - depends on EXYNOS_IOMMU > - help > - Select this to see the detailed log message that shows what > - happens in the IOMMU driver > - > - Say N unless you need kernel log message for IOMMU debugging > - > config SHMOBILE_IPMMU > bool > > diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile > index 5d58bf1..de6c909 100644 > --- a/drivers/iommu/Makefile > +++ b/drivers/iommu/Makefile > @@ -14,7 +14,6 @@ obj-$(CONFIG_OMAP_IOVMM) += omap-iovmm.o > obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o > obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o > obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o > -obj-$(CONFIG_EXYNOS_IOMMU) += exynos-iommu.o > obj-$(CONFIG_SHMOBILE_IOMMU) += shmobile-iommu.o > obj-$(CONFIG_SHMOBILE_IPMMU) += shmobile-ipmmu.o > obj-$(CONFIG_FSL_PAMU) += fsl_pamu.o fsl_pamu_domain.o > diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c > deleted file mode 100644 > index 0740189..0000000 > --- a/drivers/iommu/exynos-iommu.c > +++ /dev/null > @@ -1,1035 +0,0 @@ > -/* linux/drivers/iommu/exynos_iommu.c > - * > - * Copyright (c) 2011 Samsung Electronics Co., Ltd. > - * http://www.samsung.com > - * > - * This program is free software; you can redistribute it and/or modify > - * it under the terms of the GNU General Public License version 2 as > - * published by the Free Software Foundation. > - */ > - > -#ifdef CONFIG_EXYNOS_IOMMU_DEBUG > -#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/err.h> > -#include <linux/mm.h> > -#include <linux/iommu.h> > -#include <linux/errno.h> > -#include <linux/list.h> > -#include <linux/memblock.h> > -#include <linux/export.h> > - > -#include <asm/cacheflush.h> > -#include <asm/pgtable.h> > - > -#include <mach/sysmmu.h> > - > -/* We does not consider super section mapping (16MB) */ > -#define SECT_ORDER 20 > -#define LPAGE_ORDER 16 > -#define SPAGE_ORDER 12 > - > -#define SECT_SIZE (1 << SECT_ORDER) > -#define LPAGE_SIZE (1 << LPAGE_ORDER) > -#define SPAGE_SIZE (1 << SPAGE_ORDER) > - > -#define SECT_MASK (~(SECT_SIZE - 1)) > -#define LPAGE_MASK (~(LPAGE_SIZE - 1)) > -#define SPAGE_MASK (~(SPAGE_SIZE - 1)) > - > -#define lv1ent_fault(sent) (((*(sent) & 3) == 0) || ((*(sent) & 3) == 3)) > -#define lv1ent_page(sent) ((*(sent) & 3) == 1) > -#define lv1ent_section(sent) ((*(sent) & 3) == 2) > - > -#define lv2ent_fault(pent) ((*(pent) & 3) == 0) > -#define lv2ent_small(pent) ((*(pent) & 2) == 2) > -#define lv2ent_large(pent) ((*(pent) & 3) == 1) > - > -#define section_phys(sent) (*(sent) & SECT_MASK) > -#define section_offs(iova) ((iova) & 0xFFFFF) > -#define lpage_phys(pent) (*(pent) & LPAGE_MASK) > -#define lpage_offs(iova) ((iova) & 0xFFFF) > -#define spage_phys(pent) (*(pent) & SPAGE_MASK) > -#define spage_offs(iova) ((iova) & 0xFFF) > - > -#define lv1ent_offset(iova) ((iova) >> SECT_ORDER) > -#define lv2ent_offset(iova) (((iova) & 0xFF000) >> SPAGE_ORDER) > - > -#define NUM_LV1ENTRIES 4096 > -#define NUM_LV2ENTRIES 256 > - > -#define LV2TABLE_SIZE (NUM_LV2ENTRIES * sizeof(long)) > - > -#define SPAGES_PER_LPAGE (LPAGE_SIZE / SPAGE_SIZE) > - > -#define lv2table_base(sent) (*(sent) & 0xFFFFFC00) > - > -#define mk_lv1ent_sect(pa) ((pa) | 2) > -#define mk_lv1ent_page(pa) ((pa) | 1) > -#define mk_lv2ent_lpage(pa) ((pa) | 1) > -#define mk_lv2ent_spage(pa) ((pa) | 2) > - > -#define CTRL_ENABLE 0x5 > -#define CTRL_BLOCK 0x7 > -#define CTRL_DISABLE 0x0 > - > -#define REG_MMU_CTRL 0x000 > -#define REG_MMU_CFG 0x004 > -#define REG_MMU_STATUS 0x008 > -#define REG_MMU_FLUSH 0x00C > -#define REG_MMU_FLUSH_ENTRY 0x010 > -#define REG_PT_BASE_ADDR 0x014 > -#define REG_INT_STATUS 0x018 > -#define REG_INT_CLEAR 0x01C > - > -#define REG_PAGE_FAULT_ADDR 0x024 > -#define REG_AW_FAULT_ADDR 0x028 > -#define REG_AR_FAULT_ADDR 0x02C > -#define REG_DEFAULT_SLAVE_ADDR 0x030 > - > -#define REG_MMU_VERSION 0x034 > - > -#define REG_PB0_SADDR 0x04C > -#define REG_PB0_EADDR 0x050 > -#define REG_PB1_SADDR 0x054 > -#define REG_PB1_EADDR 0x058 > - > -static unsigned long *section_entry(unsigned long *pgtable, unsigned long iova) > -{ > - return pgtable + lv1ent_offset(iova); > -} > - > -static unsigned long *page_entry(unsigned long *sent, unsigned long iova) > -{ > - return (unsigned long *)__va(lv2table_base(sent)) + lv2ent_offset(iova); > -} > - > -enum exynos_sysmmu_inttype { > - SYSMMU_PAGEFAULT, > - SYSMMU_AR_MULTIHIT, > - SYSMMU_AW_MULTIHIT, > - SYSMMU_BUSERROR, > - SYSMMU_AR_SECURITY, > - SYSMMU_AR_ACCESS, > - SYSMMU_AW_SECURITY, > - SYSMMU_AW_PROTECTION, /* 7 */ > - SYSMMU_FAULT_UNKNOWN, > - SYSMMU_FAULTS_NUM > -}; > - > -/* > - * @itype: type of fault. > - * @pgtable_base: the physical address of page table base. This is 0 if @itype > - * is SYSMMU_BUSERROR. > - * @fault_addr: the device (virtual) address that the System MMU tried to > - * translated. This is 0 if @itype is SYSMMU_BUSERROR. > - */ > -typedef int (*sysmmu_fault_handler_t)(enum exynos_sysmmu_inttype itype, > - unsigned long pgtable_base, unsigned long fault_addr); > - > -static unsigned short fault_reg_offset[SYSMMU_FAULTS_NUM] = { > - REG_PAGE_FAULT_ADDR, > - REG_AR_FAULT_ADDR, > - REG_AW_FAULT_ADDR, > - REG_DEFAULT_SLAVE_ADDR, > - REG_AR_FAULT_ADDR, > - REG_AR_FAULT_ADDR, > - REG_AW_FAULT_ADDR, > - REG_AW_FAULT_ADDR > -}; > - > -static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = { > - "PAGE FAULT", > - "AR MULTI-HIT FAULT", > - "AW MULTI-HIT FAULT", > - "BUS ERROR", > - "AR SECURITY PROTECTION FAULT", > - "AR ACCESS PROTECTION FAULT", > - "AW SECURITY PROTECTION FAULT", > - "AW ACCESS PROTECTION FAULT", > - "UNKNOWN FAULT" > -}; > - > -struct exynos_iommu_domain { > - struct list_head clients; /* list of sysmmu_drvdata.node */ > - unsigned long *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 sysmmu_drvdata { > - struct list_head node; /* entry of exynos_iommu_domain.clients */ > - struct device *sysmmu; /* System MMU's device descriptor */ > - struct device *dev; /* Owner of system MMU */ > - char *dbgname; > - int nsfrs; > - void __iomem **sfrbases; > - struct clk *clk[2]; > - int activations; > - rwlock_t lock; > - struct iommu_domain *domain; > - sysmmu_fault_handler_t fault_handler; > - unsigned long pgtable; > -}; > - > -static bool set_sysmmu_active(struct sysmmu_drvdata *data) > -{ > - /* return true if the System MMU was not active previously > - and it needs to be initialized */ > - return ++data->activations == 1; > -} > - > -static bool set_sysmmu_inactive(struct sysmmu_drvdata *data) > -{ > - /* return true if the System MMU is needed to be disabled */ > - BUG_ON(data->activations < 1); > - return --data->activations == 0; > -} > - > -static bool is_sysmmu_active(struct sysmmu_drvdata *data) > -{ > - return data->activations > 0; > -} > - > -static void sysmmu_unblock(void __iomem *sfrbase) > -{ > - __raw_writel(CTRL_ENABLE, sfrbase + REG_MMU_CTRL); > -} > - > -static bool sysmmu_block(void __iomem *sfrbase) > -{ > - int i = 120; > - > - __raw_writel(CTRL_BLOCK, sfrbase + REG_MMU_CTRL); > - while ((i > 0) && !(__raw_readl(sfrbase + REG_MMU_STATUS) & 1)) > - --i; > - > - if (!(__raw_readl(sfrbase + REG_MMU_STATUS) & 1)) { > - sysmmu_unblock(sfrbase); > - return false; > - } > - > - return true; > -} > - > -static void __sysmmu_tlb_invalidate(void __iomem *sfrbase) > -{ > - __raw_writel(0x1, sfrbase + REG_MMU_FLUSH); > -} > - > -static void __sysmmu_tlb_invalidate_entry(void __iomem *sfrbase, > - unsigned long iova) > -{ > - __raw_writel((iova & SPAGE_MASK) | 1, sfrbase + REG_MMU_FLUSH_ENTRY); > -} > - > -static void __sysmmu_set_ptbase(void __iomem *sfrbase, > - unsigned long pgd) > -{ > - __raw_writel(0x1, sfrbase + REG_MMU_CFG); /* 16KB LV1, LRU */ > - __raw_writel(pgd, sfrbase + REG_PT_BASE_ADDR); > - > - __sysmmu_tlb_invalidate(sfrbase); > -} > - > -static void __sysmmu_set_prefbuf(void __iomem *sfrbase, unsigned long base, > - unsigned long size, int idx) > -{ > - __raw_writel(base, sfrbase + REG_PB0_SADDR + idx * 8); > - __raw_writel(size - 1 + base, sfrbase + REG_PB0_EADDR + idx * 8); > -} > - > -static void __set_fault_handler(struct sysmmu_drvdata *data, > - sysmmu_fault_handler_t handler) > -{ > - unsigned long flags; > - > - write_lock_irqsave(&data->lock, flags); > - data->fault_handler = handler; > - write_unlock_irqrestore(&data->lock, flags); > -} > - > -void exynos_sysmmu_set_fault_handler(struct device *dev, > - sysmmu_fault_handler_t handler) > -{ > - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); > - > - __set_fault_handler(data, handler); > -} > - > -static int default_fault_handler(enum exynos_sysmmu_inttype itype, > - unsigned long pgtable_base, unsigned long fault_addr) > -{ > - unsigned long *ent; > - > - if ((itype >= SYSMMU_FAULTS_NUM) || (itype < SYSMMU_PAGEFAULT)) > - itype = SYSMMU_FAULT_UNKNOWN; > - > - pr_err("%s occurred at 0x%lx(Page table base: 0x%lx)\n", > - sysmmu_fault_name[itype], fault_addr, pgtable_base); > - > - ent = section_entry(__va(pgtable_base), fault_addr); > - pr_err("\tLv1 entry: 0x%lx\n", *ent); > - > - if (lv1ent_page(ent)) { > - ent = page_entry(ent, fault_addr); > - pr_err("\t Lv2 entry: 0x%lx\n", *ent); > - } > - > - pr_err("Generating Kernel OOPS... because it is unrecoverable.\n"); > - > - BUG(); > - > - return 0; > -} > - > -static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id) > -{ > - /* SYSMMU is in blocked when interrupt occurred. */ > - struct sysmmu_drvdata *data = dev_id; > - struct resource *irqres; > - struct platform_device *pdev; > - enum exynos_sysmmu_inttype itype; > - unsigned long addr = -1; > - > - int i, ret = -ENOSYS; > - > - read_lock(&data->lock); > - > - WARN_ON(!is_sysmmu_active(data)); > - > - pdev = to_platform_device(data->sysmmu); > - for (i = 0; i < (pdev->num_resources / 2); i++) { > - irqres = platform_get_resource(pdev, IORESOURCE_IRQ, i); > - if (irqres && ((int)irqres->start == irq)) > - break; > - } > - > - if (i == pdev->num_resources) { > - itype = SYSMMU_FAULT_UNKNOWN; > - } else { > - itype = (enum exynos_sysmmu_inttype) > - __ffs(__raw_readl(data->sfrbases[i] + REG_INT_STATUS)); > - if (WARN_ON(!((itype >= 0) && (itype < SYSMMU_FAULT_UNKNOWN)))) > - itype = SYSMMU_FAULT_UNKNOWN; > - else > - addr = __raw_readl( > - data->sfrbases[i] + fault_reg_offset[itype]); > - } > - > - if (data->domain) > - ret = report_iommu_fault(data->domain, data->dev, > - addr, itype); > - > - if ((ret == -ENOSYS) && data->fault_handler) { > - unsigned long base = data->pgtable; > - if (itype != SYSMMU_FAULT_UNKNOWN) > - base = __raw_readl( > - data->sfrbases[i] + REG_PT_BASE_ADDR); > - ret = data->fault_handler(itype, base, addr); > - } > - > - if (!ret && (itype != SYSMMU_FAULT_UNKNOWN)) > - __raw_writel(1 << itype, data->sfrbases[i] + REG_INT_CLEAR); > - else > - dev_dbg(data->sysmmu, "(%s) %s is not handled.\n", > - data->dbgname, sysmmu_fault_name[itype]); > - > - if (itype != SYSMMU_FAULT_UNKNOWN) > - sysmmu_unblock(data->sfrbases[i]); > - > - read_unlock(&data->lock); > - > - return IRQ_HANDLED; > -} > - > -static bool __exynos_sysmmu_disable(struct sysmmu_drvdata *data) > -{ > - unsigned long flags; > - bool disabled = false; > - int i; > - > - write_lock_irqsave(&data->lock, flags); > - > - if (!set_sysmmu_inactive(data)) > - goto finish; > - > - for (i = 0; i < data->nsfrs; i++) > - __raw_writel(CTRL_DISABLE, data->sfrbases[i] + REG_MMU_CTRL); > - > - if (data->clk[1]) > - clk_disable(data->clk[1]); > - if (data->clk[0]) > - clk_disable(data->clk[0]); > - > - disabled = true; > - data->pgtable = 0; > - data->domain = NULL; > -finish: > - write_unlock_irqrestore(&data->lock, flags); > - > - if (disabled) > - dev_dbg(data->sysmmu, "(%s) Disabled\n", data->dbgname); > - else > - dev_dbg(data->sysmmu, "(%s) %d times left to be disabled\n", > - data->dbgname, data->activations); > - > - return disabled; > -} > - > -/* __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 sysmmu_drvdata *data, > - unsigned long pgtable, struct iommu_domain *domain) > -{ > - int i, ret = 0; > - unsigned long flags; > - > - write_lock_irqsave(&data->lock, flags); > - > - if (!set_sysmmu_active(data)) { > - if (WARN_ON(pgtable != data->pgtable)) { > - ret = -EBUSY; > - set_sysmmu_inactive(data); > - } else { > - ret = 1; > - } > - > - dev_dbg(data->sysmmu, "(%s) Already enabled\n", data->dbgname); > - goto finish; > - } > - > - if (data->clk[0]) > - clk_enable(data->clk[0]); > - if (data->clk[1]) > - clk_enable(data->clk[1]); > - > - data->pgtable = pgtable; > - > - for (i = 0; i < data->nsfrs; i++) { > - __sysmmu_set_ptbase(data->sfrbases[i], pgtable); > - > - if ((readl(data->sfrbases[i] + REG_MMU_VERSION) >> 28) == 3) { > - /* System MMU version is 3.x */ > - __raw_writel((1 << 12) | (2 << 28), > - data->sfrbases[i] + REG_MMU_CFG); > - __sysmmu_set_prefbuf(data->sfrbases[i], 0, -1, 0); > - __sysmmu_set_prefbuf(data->sfrbases[i], 0, -1, 1); > - } > - > - __raw_writel(CTRL_ENABLE, data->sfrbases[i] + REG_MMU_CTRL); > - } > - > - data->domain = domain; > - > - dev_dbg(data->sysmmu, "(%s) Enabled\n", data->dbgname); > -finish: > - write_unlock_irqrestore(&data->lock, flags); > - > - return ret; > -} > - > -int exynos_sysmmu_enable(struct device *dev, unsigned long pgtable) > -{ > - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); > - int ret; > - > - BUG_ON(!memblock_is_memory(pgtable)); > - > - ret = pm_runtime_get_sync(data->sysmmu); > - if (ret < 0) { > - dev_dbg(data->sysmmu, "(%s) Failed to enable\n", data->dbgname); > - return ret; > - } > - > - ret = __exynos_sysmmu_enable(data, pgtable, NULL); > - if (WARN_ON(ret < 0)) { > - pm_runtime_put(data->sysmmu); > - dev_err(data->sysmmu, > - "(%s) Already enabled with page table %#lx\n", > - data->dbgname, data->pgtable); > - } else { > - data->dev = dev; > - } > - > - return ret; > -} > - > -static bool exynos_sysmmu_disable(struct device *dev) > -{ > - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); > - bool disabled; > - > - disabled = __exynos_sysmmu_disable(data); > - pm_runtime_put(data->sysmmu); > - > - return disabled; > -} > - > -static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova) > -{ > - unsigned long flags; > - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); > - > - read_lock_irqsave(&data->lock, flags); > - > - if (is_sysmmu_active(data)) { > - int i; > - for (i = 0; i < data->nsfrs; i++) { > - if (sysmmu_block(data->sfrbases[i])) { > - __sysmmu_tlb_invalidate_entry( > - data->sfrbases[i], iova); > - sysmmu_unblock(data->sfrbases[i]); > - } > - } > - } else { > - dev_dbg(data->sysmmu, > - "(%s) Disabled. Skipping invalidating TLB.\n", > - data->dbgname); > - } > - > - read_unlock_irqrestore(&data->lock, flags); > -} > - > -void exynos_sysmmu_tlb_invalidate(struct device *dev) > -{ > - unsigned long flags; > - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); > - > - read_lock_irqsave(&data->lock, flags); > - > - if (is_sysmmu_active(data)) { > - int i; > - for (i = 0; i < data->nsfrs; i++) { > - if (sysmmu_block(data->sfrbases[i])) { > - __sysmmu_tlb_invalidate(data->sfrbases[i]); > - sysmmu_unblock(data->sfrbases[i]); > - } > - } > - } else { > - dev_dbg(data->sysmmu, > - "(%s) Disabled. Skipping invalidating TLB.\n", > - data->dbgname); > - } > - > - read_unlock_irqrestore(&data->lock, flags); > -} > - > -static int exynos_sysmmu_probe(struct platform_device *pdev) > -{ > - int i, ret; > - struct device *dev; > - struct sysmmu_drvdata *data; > - > - dev = &pdev->dev; > - > - data = kzalloc(sizeof(*data), GFP_KERNEL); > - if (!data) { > - dev_dbg(dev, "Not enough memory\n"); > - ret = -ENOMEM; > - goto err_alloc; > - } > - > - ret = dev_set_drvdata(dev, data); > - if (ret) { > - dev_dbg(dev, "Unabled to initialize driver data\n"); > - goto err_init; > - } > - > - data->nsfrs = pdev->num_resources / 2; > - data->sfrbases = kmalloc(sizeof(*data->sfrbases) * data->nsfrs, > - GFP_KERNEL); > - if (data->sfrbases == NULL) { > - dev_dbg(dev, "Not enough memory\n"); > - ret = -ENOMEM; > - goto err_init; > - } > - > - for (i = 0; i < data->nsfrs; i++) { > - struct resource *res; > - res = platform_get_resource(pdev, IORESOURCE_MEM, i); > - if (!res) { > - dev_dbg(dev, "Unable to find IOMEM region\n"); > - ret = -ENOENT; > - goto err_res; > - } > - > - data->sfrbases[i] = ioremap(res->start, resource_size(res)); > - if (!data->sfrbases[i]) { > - dev_dbg(dev, "Unable to map IOMEM @ PA:%#x\n", > - res->start); > - ret = -ENOENT; > - goto err_res; > - } > - } > - > - for (i = 0; i < data->nsfrs; i++) { > - ret = platform_get_irq(pdev, i); > - if (ret <= 0) { > - dev_dbg(dev, "Unable to find IRQ resource\n"); > - goto err_irq; > - } > - > - ret = request_irq(ret, exynos_sysmmu_irq, 0, > - dev_name(dev), data); > - if (ret) { > - dev_dbg(dev, "Unabled to register interrupt handler\n"); > - goto err_irq; > - } > - } > - > - if (dev_get_platdata(dev)) { > - char *deli, *beg; > - struct sysmmu_platform_data *platdata = dev_get_platdata(dev); > - > - beg = platdata->clockname; > - > - for (deli = beg; (*deli != '\0') && (*deli != ','); deli++) > - /* NOTHING */; > - > - if (*deli == '\0') > - deli = NULL; > - else > - *deli = '\0'; > - > - data->clk[0] = clk_get(dev, beg); > - if (IS_ERR(data->clk[0])) { > - data->clk[0] = NULL; > - dev_dbg(dev, "No clock descriptor registered\n"); > - } > - > - if (data->clk[0] && deli) { > - *deli = ','; > - data->clk[1] = clk_get(dev, deli + 1); > - if (IS_ERR(data->clk[1])) > - data->clk[1] = NULL; > - } > - > - data->dbgname = platdata->dbgname; > - } > - > - data->sysmmu = dev; > - rwlock_init(&data->lock); > - INIT_LIST_HEAD(&data->node); > - > - __set_fault_handler(data, &default_fault_handler); > - > - if (dev->parent) > - pm_runtime_enable(dev); > - > - dev_dbg(dev, "(%s) Initialized\n", data->dbgname); > - return 0; > -err_irq: > - while (i-- > 0) { > - int irq; > - > - irq = platform_get_irq(pdev, i); > - free_irq(irq, data); > - } > -err_res: > - while (data->nsfrs-- > 0) > - iounmap(data->sfrbases[data->nsfrs]); > - kfree(data->sfrbases); > -err_init: > - kfree(data); > -err_alloc: > - dev_err(dev, "Failed to initialize\n"); > - return ret; > -} > - > -static struct platform_driver exynos_sysmmu_driver = { > - .probe = exynos_sysmmu_probe, > - .driver = { > - .owner = THIS_MODULE, > - .name = "exynos-sysmmu", > - } > -}; > - > -static inline void pgtable_flush(void *vastart, void *vaend) > -{ > - dmac_flush_range(vastart, vaend); > - outer_flush_range(virt_to_phys(vastart), > - virt_to_phys(vaend)); > -} > - > -static int exynos_iommu_domain_init(struct iommu_domain *domain) > -{ > - struct exynos_iommu_domain *priv; > - > - priv = kzalloc(sizeof(*priv), GFP_KERNEL); > - if (!priv) > - return -ENOMEM; > - > - priv->pgtable = (unsigned long *)__get_free_pages( > - GFP_KERNEL | __GFP_ZERO, 2); > - if (!priv->pgtable) > - goto err_pgtable; > - > - priv->lv2entcnt = (short *)__get_free_pages( > - GFP_KERNEL | __GFP_ZERO, 1); > - if (!priv->lv2entcnt) > - goto err_counter; > - > - pgtable_flush(priv->pgtable, priv->pgtable + NUM_LV1ENTRIES); > - > - spin_lock_init(&priv->lock); > - spin_lock_init(&priv->pgtablelock); > - INIT_LIST_HEAD(&priv->clients); > - > - domain->geometry.aperture_start = 0; > - domain->geometry.aperture_end = ~0UL; > - domain->geometry.force_aperture = true; > - > - domain->priv = priv; > - return 0; > - > -err_counter: > - free_pages((unsigned long)priv->pgtable, 2); > -err_pgtable: > - kfree(priv); > - return -ENOMEM; > -} > - > -static void exynos_iommu_domain_destroy(struct iommu_domain *domain) > -{ > - struct exynos_iommu_domain *priv = domain->priv; > - struct sysmmu_drvdata *data; > - unsigned long flags; > - int i; > - > - WARN_ON(!list_empty(&priv->clients)); > - > - spin_lock_irqsave(&priv->lock, flags); > - > - list_for_each_entry(data, &priv->clients, node) { > - while (!exynos_sysmmu_disable(data->dev)) > - ; /* until System MMU is actually disabled */ > - } > - > - spin_unlock_irqrestore(&priv->lock, flags); > - > - for (i = 0; i < NUM_LV1ENTRIES; i++) > - if (lv1ent_page(priv->pgtable + i)) > - kfree(__va(lv2table_base(priv->pgtable + i))); > - > - free_pages((unsigned long)priv->pgtable, 2); > - free_pages((unsigned long)priv->lv2entcnt, 1); > - kfree(domain->priv); > - domain->priv = NULL; > -} > - > -static int exynos_iommu_attach_device(struct iommu_domain *domain, > - struct device *dev) > -{ > - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); > - struct exynos_iommu_domain *priv = domain->priv; > - unsigned long flags; > - int ret; > - > - ret = pm_runtime_get_sync(data->sysmmu); > - if (ret < 0) > - return ret; > - > - ret = 0; > - > - spin_lock_irqsave(&priv->lock, flags); > - > - ret = __exynos_sysmmu_enable(data, __pa(priv->pgtable), domain); > - > - if (ret == 0) { > - /* 'data->node' must not be appeared in priv->clients */ > - BUG_ON(!list_empty(&data->node)); > - data->dev = dev; > - list_add_tail(&data->node, &priv->clients); > - } > - > - spin_unlock_irqrestore(&priv->lock, flags); > - > - if (ret < 0) { > - dev_err(dev, "%s: Failed to attach IOMMU with pgtable %#lx\n", > - __func__, __pa(priv->pgtable)); > - pm_runtime_put(data->sysmmu); > - } else if (ret > 0) { > - dev_dbg(dev, "%s: IOMMU with pgtable 0x%lx already attached\n", > - __func__, __pa(priv->pgtable)); > - } else { > - dev_dbg(dev, "%s: Attached new IOMMU with pgtable 0x%lx\n", > - __func__, __pa(priv->pgtable)); > - } > - > - return ret; > -} > - > -static void exynos_iommu_detach_device(struct iommu_domain *domain, > - struct device *dev) > -{ > - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); > - struct exynos_iommu_domain *priv = domain->priv; > - struct list_head *pos; > - unsigned long flags; > - bool found = false; > - > - spin_lock_irqsave(&priv->lock, flags); > - > - list_for_each(pos, &priv->clients) { > - if (list_entry(pos, struct sysmmu_drvdata, node) == data) { > - found = true; > - break; > - } > - } > - > - if (!found) > - goto finish; > - > - if (__exynos_sysmmu_disable(data)) { > - dev_dbg(dev, "%s: Detached IOMMU with pgtable %#lx\n", > - __func__, __pa(priv->pgtable)); > - list_del_init(&data->node); > - > - } else { > - dev_dbg(dev, "%s: Detaching IOMMU with pgtable %#lx delayed", > - __func__, __pa(priv->pgtable)); > - } > - > -finish: > - spin_unlock_irqrestore(&priv->lock, flags); > - > - if (found) > - pm_runtime_put(data->sysmmu); > -} > - > -static unsigned long *alloc_lv2entry(unsigned long *sent, unsigned long iova, > - short *pgcounter) > -{ > - if (lv1ent_fault(sent)) { > - unsigned long *pent; > - > - pent = kzalloc(LV2TABLE_SIZE, GFP_ATOMIC); > - BUG_ON((unsigned long)pent & (LV2TABLE_SIZE - 1)); > - if (!pent) > - return NULL; > - > - *sent = mk_lv1ent_page(__pa(pent)); > - *pgcounter = NUM_LV2ENTRIES; > - pgtable_flush(pent, pent + NUM_LV2ENTRIES); > - pgtable_flush(sent, sent + 1); > - } > - > - return page_entry(sent, iova); > -} > - > -static int lv1set_section(unsigned long *sent, phys_addr_t paddr, short *pgcnt) > -{ > - if (lv1ent_section(sent)) > - return -EADDRINUSE; > - > - if (lv1ent_page(sent)) { > - if (*pgcnt != NUM_LV2ENTRIES) > - return -EADDRINUSE; > - > - kfree(page_entry(sent, 0)); > - > - *pgcnt = 0; > - } > - > - *sent = mk_lv1ent_sect(paddr); > - > - pgtable_flush(sent, sent + 1); > - > - return 0; > -} > - > -static int lv2set_page(unsigned long *pent, phys_addr_t paddr, size_t size, > - short *pgcnt) > -{ > - if (size == SPAGE_SIZE) { > - if (!lv2ent_fault(pent)) > - return -EADDRINUSE; > - > - *pent = mk_lv2ent_spage(paddr); > - pgtable_flush(pent, pent + 1); > - *pgcnt -= 1; > - } else { /* size == LPAGE_SIZE */ > - int i; > - for (i = 0; i < SPAGES_PER_LPAGE; i++, pent++) { > - if (!lv2ent_fault(pent)) { > - memset(pent, 0, sizeof(*pent) * i); > - return -EADDRINUSE; > - } > - > - *pent = mk_lv2ent_lpage(paddr); > - } > - pgtable_flush(pent - SPAGES_PER_LPAGE, pent); > - *pgcnt -= SPAGES_PER_LPAGE; > - } > - > - return 0; > -} > - > -static int exynos_iommu_map(struct iommu_domain *domain, unsigned long iova, > - phys_addr_t paddr, size_t size, int prot) > -{ > - struct exynos_iommu_domain *priv = domain->priv; > - unsigned long *entry; > - unsigned long flags; > - int ret = -ENOMEM; > - > - BUG_ON(priv->pgtable == NULL); > - > - spin_lock_irqsave(&priv->pgtablelock, flags); > - > - entry = section_entry(priv->pgtable, iova); > - > - if (size == SECT_SIZE) { > - ret = lv1set_section(entry, paddr, > - &priv->lv2entcnt[lv1ent_offset(iova)]); > - } else { > - unsigned long *pent; > - > - pent = alloc_lv2entry(entry, iova, > - &priv->lv2entcnt[lv1ent_offset(iova)]); > - > - if (!pent) > - ret = -ENOMEM; > - else > - ret = lv2set_page(pent, paddr, size, > - &priv->lv2entcnt[lv1ent_offset(iova)]); > - } > - > - if (ret) { > - pr_debug("%s: Failed to map iova 0x%lx/0x%x bytes\n", > - __func__, iova, size); > - } > - > - spin_unlock_irqrestore(&priv->pgtablelock, flags); > - > - return ret; > -} > - > -static size_t exynos_iommu_unmap(struct iommu_domain *domain, > - unsigned long iova, size_t size) > -{ > - struct exynos_iommu_domain *priv = domain->priv; > - struct sysmmu_drvdata *data; > - unsigned long flags; > - unsigned long *ent; > - > - BUG_ON(priv->pgtable == NULL); > - > - spin_lock_irqsave(&priv->pgtablelock, flags); > - > - ent = section_entry(priv->pgtable, iova); > - > - if (lv1ent_section(ent)) { > - BUG_ON(size < SECT_SIZE); > - > - *ent = 0; > - pgtable_flush(ent, ent + 1); > - size = SECT_SIZE; > - goto done; > - } > - > - if (unlikely(lv1ent_fault(ent))) { > - if (size > SECT_SIZE) > - size = SECT_SIZE; > - goto done; > - } > - > - /* lv1ent_page(sent) == true here */ > - > - ent = page_entry(ent, iova); > - > - if (unlikely(lv2ent_fault(ent))) { > - size = SPAGE_SIZE; > - goto done; > - } > - > - if (lv2ent_small(ent)) { > - *ent = 0; > - size = SPAGE_SIZE; > - priv->lv2entcnt[lv1ent_offset(iova)] += 1; > - goto done; > - } > - > - /* lv1ent_large(ent) == true here */ > - BUG_ON(size < LPAGE_SIZE); > - > - memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE); > - > - size = LPAGE_SIZE; > - priv->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE; > -done: > - spin_unlock_irqrestore(&priv->pgtablelock, flags); > - > - spin_lock_irqsave(&priv->lock, flags); > - list_for_each_entry(data, &priv->clients, node) > - sysmmu_tlb_invalidate_entry(data->dev, iova); > - spin_unlock_irqrestore(&priv->lock, flags); > - > - > - return size; > -} > - > -static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *domain, > - dma_addr_t iova) > -{ > - struct exynos_iommu_domain *priv = domain->priv; > - unsigned long *entry; > - unsigned long flags; > - phys_addr_t phys = 0; > - > - spin_lock_irqsave(&priv->pgtablelock, flags); > - > - entry = section_entry(priv->pgtable, iova); > - > - if (lv1ent_section(entry)) { > - phys = section_phys(entry) + section_offs(iova); > - } else if (lv1ent_page(entry)) { > - entry = page_entry(entry, iova); > - > - if (lv2ent_large(entry)) > - phys = lpage_phys(entry) + lpage_offs(iova); > - else if (lv2ent_small(entry)) > - phys = spage_phys(entry) + spage_offs(iova); > - } > - > - spin_unlock_irqrestore(&priv->pgtablelock, flags); > - > - return phys; > -} > - > -static struct iommu_ops exynos_iommu_ops = { > - .domain_init = &exynos_iommu_domain_init, > - .domain_destroy = &exynos_iommu_domain_destroy, > - .attach_dev = &exynos_iommu_attach_device, > - .detach_dev = &exynos_iommu_detach_device, > - .map = &exynos_iommu_map, > - .unmap = &exynos_iommu_unmap, > - .iova_to_phys = &exynos_iommu_iova_to_phys, > - .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE, > -}; > - > -static int __init exynos_iommu_init(void) > -{ > - int ret; > - > - ret = platform_driver_register(&exynos_sysmmu_driver); > - > - if (ret == 0) > - bus_set_iommu(&platform_bus_type, &exynos_iommu_ops); > - > - return ret; > -} > -subsys_initcall(exynos_iommu_init); > -- > 1.7.10.4 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Hello, On 2014-02-07 13:44, Kyungmin Park wrote: > > On Friday, February 7, 2014, Inki Dae <inki.dae@samsung.com > <mailto:inki.dae@samsung.com>> wrote: > > 2014-02-07 Olof Johansson <olof@lixom.net <javascript:;>>: > > The driver has been unbuildable due to unfulfilled dependencies > since > > 3.11, and even if enabled it won't build due to build breakage. > Emails > > about status on this have gone unanswered, and fixes seem to > have been > > abandoned. > > > > It's obvious that nobody cares about it, so let's remove it. > > Wait, we are going to fix up this module. It seems that KyoungHo, > original author, is busy with some works related to product. > > we can care about it if KyoungHo cannot afford to care for the > time being. > > Any volunteers? > Marek or Bartek, how do you think? > > Before that it makes orphan or unsupported at maintainer file first and > change it to new volunteers. I think that it might be easier to remove the existing non-functional driver now and add it again once the driver is ready. I have it on my TODO list, but doubt I will manage to finish it for v3.15. Discussing the DT bindings might take some time. Best regards
On Mon, Feb 10, 2014 at 10:21 PM, Kukjin Kim <kgene.kim@gmail.com> wrote: > Just adding KyongHo Cho. > > If he can fixup for this time, it would be best solution because he knows > well than others, I think. It's not so much a matter of "fixup for this time", it's a about having ownership of the driver, making sure it works (and keeps working if there is related development). The posted patches have not been followed through on and the result is a broken driver. :( I definitely appreciate his expertise, and we should make sure that he gets to review the code, but if someone else is able to spend time on reworking the driver (or rewriting a newer one) and maintaining it longer-term, then we should not stop them from doing so. And there is no reason to keep broken stale code in the kernel meanwhile. -Olof
> -----Original Message----- > From: Olof Johansson [mailto:olof@lixom.net] > Sent: Friday, February 14, 2014 4:34 AM > > On Mon, Feb 10, 2014 at 10:21 PM, Kukjin Kim <kgene.kim@gmail.com> wrote: > > > Just adding KyongHo Cho. > > > > If he can fixup for this time, it would be best solution because he knows > > well than others, I think. > > It's not so much a matter of "fixup for this time", it's a about > having ownership of the driver, making sure it works (and keeps > working if there is related development). The posted patches have not > been followed through on and the result is a broken driver. :( > > I definitely appreciate his expertise, and we should make sure that he > gets to review the code, but if someone else is able to spend time on > reworking the driver (or rewriting a newer one) and maintaining it > longer-term, then we should not stop them from doing so. And there is > no reason to keep broken stale code in the kernel meanwhile. > Thank you for your concerning. I also definitely agree with you that the driver must work. I am always concerning about it but it was not easy to make some time for the patches. I will continue to post the next version of patches, of course. I think it is not far from now to show it. Regards, Ky0ongHo
On Fri, Feb 14, 2014 at 9:17 AM, Cho KyongHo <pullip.cho@samsung.com> wrote: >> -----Original Message----- >> From: Olof Johansson [mailto:olof@lixom.net] >> Sent: Friday, February 14, 2014 4:34 AM >> >> On Mon, Feb 10, 2014 at 10:21 PM, Kukjin Kim <kgene.kim@gmail.com> wrote: >> >> > Just adding KyongHo Cho. >> > >> > If he can fixup for this time, it would be best solution because he knows >> > well than others, I think. >> >> It's not so much a matter of "fixup for this time", it's a about >> having ownership of the driver, making sure it works (and keeps >> working if there is related development). The posted patches have not >> been followed through on and the result is a broken driver. :( >> >> I definitely appreciate his expertise, and we should make sure that he >> gets to review the code, but if someone else is able to spend time on >> reworking the driver (or rewriting a newer one) and maintaining it >> longer-term, then we should not stop them from doing so. And there is >> no reason to keep broken stale code in the kernel meanwhile. >> > > Thank you for your concerning. > I also definitely agree with you that the driver must work. > I am always concerning about it but it was not easy to make some time > for the patches. > > I will continue to post the next version of patches, of course. > I think it is not far from now to show it. Lots of time is going from last reply. there are two options. 1. just waiting more 2. remove it as patch and start it again by someone. what's the opinions? Thank you, Kyungmin Park
On Thu, Mar 6, 2014 at 8:48 AM, Kyungmin Park <kmpark@infradead.org> wrote: > On Fri, Feb 14, 2014 at 9:17 AM, Cho KyongHo <pullip.cho@samsung.com> wrote: >>> -----Original Message----- >>> From: Olof Johansson [mailto:olof@lixom.net] >>> Sent: Friday, February 14, 2014 4:34 AM >>> >>> On Mon, Feb 10, 2014 at 10:21 PM, Kukjin Kim <kgene.kim@gmail.com> wrote: >>> >>> > Just adding KyongHo Cho. >>> > >>> > If he can fixup for this time, it would be best solution because he knows >>> > well than others, I think. >>> >>> It's not so much a matter of "fixup for this time", it's a about >>> having ownership of the driver, making sure it works (and keeps >>> working if there is related development). The posted patches have not >>> been followed through on and the result is a broken driver. :( >>> >>> I definitely appreciate his expertise, and we should make sure that he >>> gets to review the code, but if someone else is able to spend time on >>> reworking the driver (or rewriting a newer one) and maintaining it >>> longer-term, then we should not stop them from doing so. And there is >>> no reason to keep broken stale code in the kernel meanwhile. >>> >> >> Thank you for your concerning. >> I also definitely agree with you that the driver must work. >> I am always concerning about it but it was not easy to make some time >> for the patches. >> >> I will continue to post the next version of patches, of course. >> I think it is not far from now to show it. > > Lots of time is going from last reply. there are two options. > 1. just waiting more > 2. remove it as patch and start it again by someone. > > what's the opinions? > Please be patient until the patches are OK enough to post. The patches have lots of improvements and workarounds. Sorry for delaying the patches. One thing is certain, starting from scratch is not a good idea. Why not discuss with me to make exynos-iommu driver better? Thank you. KyongHo
Hi KyongHo, On 09.03.2014 14:54, KyongHo Cho wrote: > On Thu, Mar 6, 2014 at 8:48 AM, Kyungmin Park <kmpark@infradead.org> wrote: >> On Fri, Feb 14, 2014 at 9:17 AM, Cho KyongHo <pullip.cho@samsung.com> wrote: >>>> -----Original Message----- >>>> From: Olof Johansson [mailto:olof@lixom.net] >>>> Sent: Friday, February 14, 2014 4:34 AM >>>> >>>> On Mon, Feb 10, 2014 at 10:21 PM, Kukjin Kim <kgene.kim@gmail.com> wrote: >>>> >>>>> Just adding KyongHo Cho. >>>>> >>>>> If he can fixup for this time, it would be best solution because he knows >>>>> well than others, I think. >>>> >>>> It's not so much a matter of "fixup for this time", it's a about >>>> having ownership of the driver, making sure it works (and keeps >>>> working if there is related development). The posted patches have not >>>> been followed through on and the result is a broken driver. :( >>>> >>>> I definitely appreciate his expertise, and we should make sure that he >>>> gets to review the code, but if someone else is able to spend time on >>>> reworking the driver (or rewriting a newer one) and maintaining it >>>> longer-term, then we should not stop them from doing so. And there is >>>> no reason to keep broken stale code in the kernel meanwhile. >>>> >>> >>> Thank you for your concerning. >>> I also definitely agree with you that the driver must work. >>> I am always concerning about it but it was not easy to make some time >>> for the patches. >>> >>> I will continue to post the next version of patches, of course. >>> I think it is not far from now to show it. >> >> Lots of time is going from last reply. there are two options. >> 1. just waiting more >> 2. remove it as patch and start it again by someone. >> >> what's the opinions? >> > > Please be patient until the patches are OK enough to post. > > The patches have lots of improvements and workarounds. > > Sorry for delaying the patches. > > One thing is certain, starting from scratch is not a good idea. > Why not discuss with me to make exynos-iommu driver better? It is not a matter of starting from scratch or not, but rather of getting a reasonable IOMMU driver for Exynos in mainline in reasonable period of time. Usually it is much easier to just remove a stale driver and quickly refactor all the code at once and then add a "new" driver, than wasting time on submitting heaps of patches for a driver that is not used and does not work anyway. In fact, we already have a working driver, based on heavily refactored original one in our internal tree anyway and we are just wasting time on waiting for next version of the original refactor series to come, while we could simply drop current version from the kernel, squash all of any changes to it into a one patch adding the new driver and submit it instead. Of course care would be taken to preserve any authorship information. Do you have some time frame in which you may post next version of the series (and guaranteed time to work on it)? Best regards, Tomasz
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index 79bbc21..b893367 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -176,27 +176,6 @@ config TEGRA_IOMMU_SMMU space through the SMMU (System Memory Management Unit) hardware included on Tegra SoCs. -config EXYNOS_IOMMU - bool "Exynos IOMMU Support" - depends on ARCH_EXYNOS && EXYNOS_DEV_SYSMMU - select IOMMU_API - help - Support for the IOMMU(System MMU) of Samsung Exynos application - processor family. This enables H/W multimedia accellerators to see - non-linear physical memory chunks as a linear memory in their - address spaces - - If unsure, say N here. - -config EXYNOS_IOMMU_DEBUG - bool "Debugging log for Exynos IOMMU" - depends on EXYNOS_IOMMU - help - Select this to see the detailed log message that shows what - happens in the IOMMU driver - - Say N unless you need kernel log message for IOMMU debugging - config SHMOBILE_IPMMU bool diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile index 5d58bf1..de6c909 100644 --- a/drivers/iommu/Makefile +++ b/drivers/iommu/Makefile @@ -14,7 +14,6 @@ obj-$(CONFIG_OMAP_IOVMM) += omap-iovmm.o obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o -obj-$(CONFIG_EXYNOS_IOMMU) += exynos-iommu.o obj-$(CONFIG_SHMOBILE_IOMMU) += shmobile-iommu.o obj-$(CONFIG_SHMOBILE_IPMMU) += shmobile-ipmmu.o obj-$(CONFIG_FSL_PAMU) += fsl_pamu.o fsl_pamu_domain.o diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c deleted file mode 100644 index 0740189..0000000 --- a/drivers/iommu/exynos-iommu.c +++ /dev/null @@ -1,1035 +0,0 @@ -/* linux/drivers/iommu/exynos_iommu.c - * - * Copyright (c) 2011 Samsung Electronics Co., Ltd. - * http://www.samsung.com - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#ifdef CONFIG_EXYNOS_IOMMU_DEBUG -#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/err.h> -#include <linux/mm.h> -#include <linux/iommu.h> -#include <linux/errno.h> -#include <linux/list.h> -#include <linux/memblock.h> -#include <linux/export.h> - -#include <asm/cacheflush.h> -#include <asm/pgtable.h> - -#include <mach/sysmmu.h> - -/* We does not consider super section mapping (16MB) */ -#define SECT_ORDER 20 -#define LPAGE_ORDER 16 -#define SPAGE_ORDER 12 - -#define SECT_SIZE (1 << SECT_ORDER) -#define LPAGE_SIZE (1 << LPAGE_ORDER) -#define SPAGE_SIZE (1 << SPAGE_ORDER) - -#define SECT_MASK (~(SECT_SIZE - 1)) -#define LPAGE_MASK (~(LPAGE_SIZE - 1)) -#define SPAGE_MASK (~(SPAGE_SIZE - 1)) - -#define lv1ent_fault(sent) (((*(sent) & 3) == 0) || ((*(sent) & 3) == 3)) -#define lv1ent_page(sent) ((*(sent) & 3) == 1) -#define lv1ent_section(sent) ((*(sent) & 3) == 2) - -#define lv2ent_fault(pent) ((*(pent) & 3) == 0) -#define lv2ent_small(pent) ((*(pent) & 2) == 2) -#define lv2ent_large(pent) ((*(pent) & 3) == 1) - -#define section_phys(sent) (*(sent) & SECT_MASK) -#define section_offs(iova) ((iova) & 0xFFFFF) -#define lpage_phys(pent) (*(pent) & LPAGE_MASK) -#define lpage_offs(iova) ((iova) & 0xFFFF) -#define spage_phys(pent) (*(pent) & SPAGE_MASK) -#define spage_offs(iova) ((iova) & 0xFFF) - -#define lv1ent_offset(iova) ((iova) >> SECT_ORDER) -#define lv2ent_offset(iova) (((iova) & 0xFF000) >> SPAGE_ORDER) - -#define NUM_LV1ENTRIES 4096 -#define NUM_LV2ENTRIES 256 - -#define LV2TABLE_SIZE (NUM_LV2ENTRIES * sizeof(long)) - -#define SPAGES_PER_LPAGE (LPAGE_SIZE / SPAGE_SIZE) - -#define lv2table_base(sent) (*(sent) & 0xFFFFFC00) - -#define mk_lv1ent_sect(pa) ((pa) | 2) -#define mk_lv1ent_page(pa) ((pa) | 1) -#define mk_lv2ent_lpage(pa) ((pa) | 1) -#define mk_lv2ent_spage(pa) ((pa) | 2) - -#define CTRL_ENABLE 0x5 -#define CTRL_BLOCK 0x7 -#define CTRL_DISABLE 0x0 - -#define REG_MMU_CTRL 0x000 -#define REG_MMU_CFG 0x004 -#define REG_MMU_STATUS 0x008 -#define REG_MMU_FLUSH 0x00C -#define REG_MMU_FLUSH_ENTRY 0x010 -#define REG_PT_BASE_ADDR 0x014 -#define REG_INT_STATUS 0x018 -#define REG_INT_CLEAR 0x01C - -#define REG_PAGE_FAULT_ADDR 0x024 -#define REG_AW_FAULT_ADDR 0x028 -#define REG_AR_FAULT_ADDR 0x02C -#define REG_DEFAULT_SLAVE_ADDR 0x030 - -#define REG_MMU_VERSION 0x034 - -#define REG_PB0_SADDR 0x04C -#define REG_PB0_EADDR 0x050 -#define REG_PB1_SADDR 0x054 -#define REG_PB1_EADDR 0x058 - -static unsigned long *section_entry(unsigned long *pgtable, unsigned long iova) -{ - return pgtable + lv1ent_offset(iova); -} - -static unsigned long *page_entry(unsigned long *sent, unsigned long iova) -{ - return (unsigned long *)__va(lv2table_base(sent)) + lv2ent_offset(iova); -} - -enum exynos_sysmmu_inttype { - SYSMMU_PAGEFAULT, - SYSMMU_AR_MULTIHIT, - SYSMMU_AW_MULTIHIT, - SYSMMU_BUSERROR, - SYSMMU_AR_SECURITY, - SYSMMU_AR_ACCESS, - SYSMMU_AW_SECURITY, - SYSMMU_AW_PROTECTION, /* 7 */ - SYSMMU_FAULT_UNKNOWN, - SYSMMU_FAULTS_NUM -}; - -/* - * @itype: type of fault. - * @pgtable_base: the physical address of page table base. This is 0 if @itype - * is SYSMMU_BUSERROR. - * @fault_addr: the device (virtual) address that the System MMU tried to - * translated. This is 0 if @itype is SYSMMU_BUSERROR. - */ -typedef int (*sysmmu_fault_handler_t)(enum exynos_sysmmu_inttype itype, - unsigned long pgtable_base, unsigned long fault_addr); - -static unsigned short fault_reg_offset[SYSMMU_FAULTS_NUM] = { - REG_PAGE_FAULT_ADDR, - REG_AR_FAULT_ADDR, - REG_AW_FAULT_ADDR, - REG_DEFAULT_SLAVE_ADDR, - REG_AR_FAULT_ADDR, - REG_AR_FAULT_ADDR, - REG_AW_FAULT_ADDR, - REG_AW_FAULT_ADDR -}; - -static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = { - "PAGE FAULT", - "AR MULTI-HIT FAULT", - "AW MULTI-HIT FAULT", - "BUS ERROR", - "AR SECURITY PROTECTION FAULT", - "AR ACCESS PROTECTION FAULT", - "AW SECURITY PROTECTION FAULT", - "AW ACCESS PROTECTION FAULT", - "UNKNOWN FAULT" -}; - -struct exynos_iommu_domain { - struct list_head clients; /* list of sysmmu_drvdata.node */ - unsigned long *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 sysmmu_drvdata { - struct list_head node; /* entry of exynos_iommu_domain.clients */ - struct device *sysmmu; /* System MMU's device descriptor */ - struct device *dev; /* Owner of system MMU */ - char *dbgname; - int nsfrs; - void __iomem **sfrbases; - struct clk *clk[2]; - int activations; - rwlock_t lock; - struct iommu_domain *domain; - sysmmu_fault_handler_t fault_handler; - unsigned long pgtable; -}; - -static bool set_sysmmu_active(struct sysmmu_drvdata *data) -{ - /* return true if the System MMU was not active previously - and it needs to be initialized */ - return ++data->activations == 1; -} - -static bool set_sysmmu_inactive(struct sysmmu_drvdata *data) -{ - /* return true if the System MMU is needed to be disabled */ - BUG_ON(data->activations < 1); - return --data->activations == 0; -} - -static bool is_sysmmu_active(struct sysmmu_drvdata *data) -{ - return data->activations > 0; -} - -static void sysmmu_unblock(void __iomem *sfrbase) -{ - __raw_writel(CTRL_ENABLE, sfrbase + REG_MMU_CTRL); -} - -static bool sysmmu_block(void __iomem *sfrbase) -{ - int i = 120; - - __raw_writel(CTRL_BLOCK, sfrbase + REG_MMU_CTRL); - while ((i > 0) && !(__raw_readl(sfrbase + REG_MMU_STATUS) & 1)) - --i; - - if (!(__raw_readl(sfrbase + REG_MMU_STATUS) & 1)) { - sysmmu_unblock(sfrbase); - return false; - } - - return true; -} - -static void __sysmmu_tlb_invalidate(void __iomem *sfrbase) -{ - __raw_writel(0x1, sfrbase + REG_MMU_FLUSH); -} - -static void __sysmmu_tlb_invalidate_entry(void __iomem *sfrbase, - unsigned long iova) -{ - __raw_writel((iova & SPAGE_MASK) | 1, sfrbase + REG_MMU_FLUSH_ENTRY); -} - -static void __sysmmu_set_ptbase(void __iomem *sfrbase, - unsigned long pgd) -{ - __raw_writel(0x1, sfrbase + REG_MMU_CFG); /* 16KB LV1, LRU */ - __raw_writel(pgd, sfrbase + REG_PT_BASE_ADDR); - - __sysmmu_tlb_invalidate(sfrbase); -} - -static void __sysmmu_set_prefbuf(void __iomem *sfrbase, unsigned long base, - unsigned long size, int idx) -{ - __raw_writel(base, sfrbase + REG_PB0_SADDR + idx * 8); - __raw_writel(size - 1 + base, sfrbase + REG_PB0_EADDR + idx * 8); -} - -static void __set_fault_handler(struct sysmmu_drvdata *data, - sysmmu_fault_handler_t handler) -{ - unsigned long flags; - - write_lock_irqsave(&data->lock, flags); - data->fault_handler = handler; - write_unlock_irqrestore(&data->lock, flags); -} - -void exynos_sysmmu_set_fault_handler(struct device *dev, - sysmmu_fault_handler_t handler) -{ - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); - - __set_fault_handler(data, handler); -} - -static int default_fault_handler(enum exynos_sysmmu_inttype itype, - unsigned long pgtable_base, unsigned long fault_addr) -{ - unsigned long *ent; - - if ((itype >= SYSMMU_FAULTS_NUM) || (itype < SYSMMU_PAGEFAULT)) - itype = SYSMMU_FAULT_UNKNOWN; - - pr_err("%s occurred at 0x%lx(Page table base: 0x%lx)\n", - sysmmu_fault_name[itype], fault_addr, pgtable_base); - - ent = section_entry(__va(pgtable_base), fault_addr); - pr_err("\tLv1 entry: 0x%lx\n", *ent); - - if (lv1ent_page(ent)) { - ent = page_entry(ent, fault_addr); - pr_err("\t Lv2 entry: 0x%lx\n", *ent); - } - - pr_err("Generating Kernel OOPS... because it is unrecoverable.\n"); - - BUG(); - - return 0; -} - -static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id) -{ - /* SYSMMU is in blocked when interrupt occurred. */ - struct sysmmu_drvdata *data = dev_id; - struct resource *irqres; - struct platform_device *pdev; - enum exynos_sysmmu_inttype itype; - unsigned long addr = -1; - - int i, ret = -ENOSYS; - - read_lock(&data->lock); - - WARN_ON(!is_sysmmu_active(data)); - - pdev = to_platform_device(data->sysmmu); - for (i = 0; i < (pdev->num_resources / 2); i++) { - irqres = platform_get_resource(pdev, IORESOURCE_IRQ, i); - if (irqres && ((int)irqres->start == irq)) - break; - } - - if (i == pdev->num_resources) { - itype = SYSMMU_FAULT_UNKNOWN; - } else { - itype = (enum exynos_sysmmu_inttype) - __ffs(__raw_readl(data->sfrbases[i] + REG_INT_STATUS)); - if (WARN_ON(!((itype >= 0) && (itype < SYSMMU_FAULT_UNKNOWN)))) - itype = SYSMMU_FAULT_UNKNOWN; - else - addr = __raw_readl( - data->sfrbases[i] + fault_reg_offset[itype]); - } - - if (data->domain) - ret = report_iommu_fault(data->domain, data->dev, - addr, itype); - - if ((ret == -ENOSYS) && data->fault_handler) { - unsigned long base = data->pgtable; - if (itype != SYSMMU_FAULT_UNKNOWN) - base = __raw_readl( - data->sfrbases[i] + REG_PT_BASE_ADDR); - ret = data->fault_handler(itype, base, addr); - } - - if (!ret && (itype != SYSMMU_FAULT_UNKNOWN)) - __raw_writel(1 << itype, data->sfrbases[i] + REG_INT_CLEAR); - else - dev_dbg(data->sysmmu, "(%s) %s is not handled.\n", - data->dbgname, sysmmu_fault_name[itype]); - - if (itype != SYSMMU_FAULT_UNKNOWN) - sysmmu_unblock(data->sfrbases[i]); - - read_unlock(&data->lock); - - return IRQ_HANDLED; -} - -static bool __exynos_sysmmu_disable(struct sysmmu_drvdata *data) -{ - unsigned long flags; - bool disabled = false; - int i; - - write_lock_irqsave(&data->lock, flags); - - if (!set_sysmmu_inactive(data)) - goto finish; - - for (i = 0; i < data->nsfrs; i++) - __raw_writel(CTRL_DISABLE, data->sfrbases[i] + REG_MMU_CTRL); - - if (data->clk[1]) - clk_disable(data->clk[1]); - if (data->clk[0]) - clk_disable(data->clk[0]); - - disabled = true; - data->pgtable = 0; - data->domain = NULL; -finish: - write_unlock_irqrestore(&data->lock, flags); - - if (disabled) - dev_dbg(data->sysmmu, "(%s) Disabled\n", data->dbgname); - else - dev_dbg(data->sysmmu, "(%s) %d times left to be disabled\n", - data->dbgname, data->activations); - - return disabled; -} - -/* __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 sysmmu_drvdata *data, - unsigned long pgtable, struct iommu_domain *domain) -{ - int i, ret = 0; - unsigned long flags; - - write_lock_irqsave(&data->lock, flags); - - if (!set_sysmmu_active(data)) { - if (WARN_ON(pgtable != data->pgtable)) { - ret = -EBUSY; - set_sysmmu_inactive(data); - } else { - ret = 1; - } - - dev_dbg(data->sysmmu, "(%s) Already enabled\n", data->dbgname); - goto finish; - } - - if (data->clk[0]) - clk_enable(data->clk[0]); - if (data->clk[1]) - clk_enable(data->clk[1]); - - data->pgtable = pgtable; - - for (i = 0; i < data->nsfrs; i++) { - __sysmmu_set_ptbase(data->sfrbases[i], pgtable); - - if ((readl(data->sfrbases[i] + REG_MMU_VERSION) >> 28) == 3) { - /* System MMU version is 3.x */ - __raw_writel((1 << 12) | (2 << 28), - data->sfrbases[i] + REG_MMU_CFG); - __sysmmu_set_prefbuf(data->sfrbases[i], 0, -1, 0); - __sysmmu_set_prefbuf(data->sfrbases[i], 0, -1, 1); - } - - __raw_writel(CTRL_ENABLE, data->sfrbases[i] + REG_MMU_CTRL); - } - - data->domain = domain; - - dev_dbg(data->sysmmu, "(%s) Enabled\n", data->dbgname); -finish: - write_unlock_irqrestore(&data->lock, flags); - - return ret; -} - -int exynos_sysmmu_enable(struct device *dev, unsigned long pgtable) -{ - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); - int ret; - - BUG_ON(!memblock_is_memory(pgtable)); - - ret = pm_runtime_get_sync(data->sysmmu); - if (ret < 0) { - dev_dbg(data->sysmmu, "(%s) Failed to enable\n", data->dbgname); - return ret; - } - - ret = __exynos_sysmmu_enable(data, pgtable, NULL); - if (WARN_ON(ret < 0)) { - pm_runtime_put(data->sysmmu); - dev_err(data->sysmmu, - "(%s) Already enabled with page table %#lx\n", - data->dbgname, data->pgtable); - } else { - data->dev = dev; - } - - return ret; -} - -static bool exynos_sysmmu_disable(struct device *dev) -{ - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); - bool disabled; - - disabled = __exynos_sysmmu_disable(data); - pm_runtime_put(data->sysmmu); - - return disabled; -} - -static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova) -{ - unsigned long flags; - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); - - read_lock_irqsave(&data->lock, flags); - - if (is_sysmmu_active(data)) { - int i; - for (i = 0; i < data->nsfrs; i++) { - if (sysmmu_block(data->sfrbases[i])) { - __sysmmu_tlb_invalidate_entry( - data->sfrbases[i], iova); - sysmmu_unblock(data->sfrbases[i]); - } - } - } else { - dev_dbg(data->sysmmu, - "(%s) Disabled. Skipping invalidating TLB.\n", - data->dbgname); - } - - read_unlock_irqrestore(&data->lock, flags); -} - -void exynos_sysmmu_tlb_invalidate(struct device *dev) -{ - unsigned long flags; - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); - - read_lock_irqsave(&data->lock, flags); - - if (is_sysmmu_active(data)) { - int i; - for (i = 0; i < data->nsfrs; i++) { - if (sysmmu_block(data->sfrbases[i])) { - __sysmmu_tlb_invalidate(data->sfrbases[i]); - sysmmu_unblock(data->sfrbases[i]); - } - } - } else { - dev_dbg(data->sysmmu, - "(%s) Disabled. Skipping invalidating TLB.\n", - data->dbgname); - } - - read_unlock_irqrestore(&data->lock, flags); -} - -static int exynos_sysmmu_probe(struct platform_device *pdev) -{ - int i, ret; - struct device *dev; - struct sysmmu_drvdata *data; - - dev = &pdev->dev; - - data = kzalloc(sizeof(*data), GFP_KERNEL); - if (!data) { - dev_dbg(dev, "Not enough memory\n"); - ret = -ENOMEM; - goto err_alloc; - } - - ret = dev_set_drvdata(dev, data); - if (ret) { - dev_dbg(dev, "Unabled to initialize driver data\n"); - goto err_init; - } - - data->nsfrs = pdev->num_resources / 2; - data->sfrbases = kmalloc(sizeof(*data->sfrbases) * data->nsfrs, - GFP_KERNEL); - if (data->sfrbases == NULL) { - dev_dbg(dev, "Not enough memory\n"); - ret = -ENOMEM; - goto err_init; - } - - for (i = 0; i < data->nsfrs; i++) { - struct resource *res; - res = platform_get_resource(pdev, IORESOURCE_MEM, i); - if (!res) { - dev_dbg(dev, "Unable to find IOMEM region\n"); - ret = -ENOENT; - goto err_res; - } - - data->sfrbases[i] = ioremap(res->start, resource_size(res)); - if (!data->sfrbases[i]) { - dev_dbg(dev, "Unable to map IOMEM @ PA:%#x\n", - res->start); - ret = -ENOENT; - goto err_res; - } - } - - for (i = 0; i < data->nsfrs; i++) { - ret = platform_get_irq(pdev, i); - if (ret <= 0) { - dev_dbg(dev, "Unable to find IRQ resource\n"); - goto err_irq; - } - - ret = request_irq(ret, exynos_sysmmu_irq, 0, - dev_name(dev), data); - if (ret) { - dev_dbg(dev, "Unabled to register interrupt handler\n"); - goto err_irq; - } - } - - if (dev_get_platdata(dev)) { - char *deli, *beg; - struct sysmmu_platform_data *platdata = dev_get_platdata(dev); - - beg = platdata->clockname; - - for (deli = beg; (*deli != '\0') && (*deli != ','); deli++) - /* NOTHING */; - - if (*deli == '\0') - deli = NULL; - else - *deli = '\0'; - - data->clk[0] = clk_get(dev, beg); - if (IS_ERR(data->clk[0])) { - data->clk[0] = NULL; - dev_dbg(dev, "No clock descriptor registered\n"); - } - - if (data->clk[0] && deli) { - *deli = ','; - data->clk[1] = clk_get(dev, deli + 1); - if (IS_ERR(data->clk[1])) - data->clk[1] = NULL; - } - - data->dbgname = platdata->dbgname; - } - - data->sysmmu = dev; - rwlock_init(&data->lock); - INIT_LIST_HEAD(&data->node); - - __set_fault_handler(data, &default_fault_handler); - - if (dev->parent) - pm_runtime_enable(dev); - - dev_dbg(dev, "(%s) Initialized\n", data->dbgname); - return 0; -err_irq: - while (i-- > 0) { - int irq; - - irq = platform_get_irq(pdev, i); - free_irq(irq, data); - } -err_res: - while (data->nsfrs-- > 0) - iounmap(data->sfrbases[data->nsfrs]); - kfree(data->sfrbases); -err_init: - kfree(data); -err_alloc: - dev_err(dev, "Failed to initialize\n"); - return ret; -} - -static struct platform_driver exynos_sysmmu_driver = { - .probe = exynos_sysmmu_probe, - .driver = { - .owner = THIS_MODULE, - .name = "exynos-sysmmu", - } -}; - -static inline void pgtable_flush(void *vastart, void *vaend) -{ - dmac_flush_range(vastart, vaend); - outer_flush_range(virt_to_phys(vastart), - virt_to_phys(vaend)); -} - -static int exynos_iommu_domain_init(struct iommu_domain *domain) -{ - struct exynos_iommu_domain *priv; - - priv = kzalloc(sizeof(*priv), GFP_KERNEL); - if (!priv) - return -ENOMEM; - - priv->pgtable = (unsigned long *)__get_free_pages( - GFP_KERNEL | __GFP_ZERO, 2); - if (!priv->pgtable) - goto err_pgtable; - - priv->lv2entcnt = (short *)__get_free_pages( - GFP_KERNEL | __GFP_ZERO, 1); - if (!priv->lv2entcnt) - goto err_counter; - - pgtable_flush(priv->pgtable, priv->pgtable + NUM_LV1ENTRIES); - - spin_lock_init(&priv->lock); - spin_lock_init(&priv->pgtablelock); - INIT_LIST_HEAD(&priv->clients); - - domain->geometry.aperture_start = 0; - domain->geometry.aperture_end = ~0UL; - domain->geometry.force_aperture = true; - - domain->priv = priv; - return 0; - -err_counter: - free_pages((unsigned long)priv->pgtable, 2); -err_pgtable: - kfree(priv); - return -ENOMEM; -} - -static void exynos_iommu_domain_destroy(struct iommu_domain *domain) -{ - struct exynos_iommu_domain *priv = domain->priv; - struct sysmmu_drvdata *data; - unsigned long flags; - int i; - - WARN_ON(!list_empty(&priv->clients)); - - spin_lock_irqsave(&priv->lock, flags); - - list_for_each_entry(data, &priv->clients, node) { - while (!exynos_sysmmu_disable(data->dev)) - ; /* until System MMU is actually disabled */ - } - - spin_unlock_irqrestore(&priv->lock, flags); - - for (i = 0; i < NUM_LV1ENTRIES; i++) - if (lv1ent_page(priv->pgtable + i)) - kfree(__va(lv2table_base(priv->pgtable + i))); - - free_pages((unsigned long)priv->pgtable, 2); - free_pages((unsigned long)priv->lv2entcnt, 1); - kfree(domain->priv); - domain->priv = NULL; -} - -static int exynos_iommu_attach_device(struct iommu_domain *domain, - struct device *dev) -{ - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); - struct exynos_iommu_domain *priv = domain->priv; - unsigned long flags; - int ret; - - ret = pm_runtime_get_sync(data->sysmmu); - if (ret < 0) - return ret; - - ret = 0; - - spin_lock_irqsave(&priv->lock, flags); - - ret = __exynos_sysmmu_enable(data, __pa(priv->pgtable), domain); - - if (ret == 0) { - /* 'data->node' must not be appeared in priv->clients */ - BUG_ON(!list_empty(&data->node)); - data->dev = dev; - list_add_tail(&data->node, &priv->clients); - } - - spin_unlock_irqrestore(&priv->lock, flags); - - if (ret < 0) { - dev_err(dev, "%s: Failed to attach IOMMU with pgtable %#lx\n", - __func__, __pa(priv->pgtable)); - pm_runtime_put(data->sysmmu); - } else if (ret > 0) { - dev_dbg(dev, "%s: IOMMU with pgtable 0x%lx already attached\n", - __func__, __pa(priv->pgtable)); - } else { - dev_dbg(dev, "%s: Attached new IOMMU with pgtable 0x%lx\n", - __func__, __pa(priv->pgtable)); - } - - return ret; -} - -static void exynos_iommu_detach_device(struct iommu_domain *domain, - struct device *dev) -{ - struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); - struct exynos_iommu_domain *priv = domain->priv; - struct list_head *pos; - unsigned long flags; - bool found = false; - - spin_lock_irqsave(&priv->lock, flags); - - list_for_each(pos, &priv->clients) { - if (list_entry(pos, struct sysmmu_drvdata, node) == data) { - found = true; - break; - } - } - - if (!found) - goto finish; - - if (__exynos_sysmmu_disable(data)) { - dev_dbg(dev, "%s: Detached IOMMU with pgtable %#lx\n", - __func__, __pa(priv->pgtable)); - list_del_init(&data->node); - - } else { - dev_dbg(dev, "%s: Detaching IOMMU with pgtable %#lx delayed", - __func__, __pa(priv->pgtable)); - } - -finish: - spin_unlock_irqrestore(&priv->lock, flags); - - if (found) - pm_runtime_put(data->sysmmu); -} - -static unsigned long *alloc_lv2entry(unsigned long *sent, unsigned long iova, - short *pgcounter) -{ - if (lv1ent_fault(sent)) { - unsigned long *pent; - - pent = kzalloc(LV2TABLE_SIZE, GFP_ATOMIC); - BUG_ON((unsigned long)pent & (LV2TABLE_SIZE - 1)); - if (!pent) - return NULL; - - *sent = mk_lv1ent_page(__pa(pent)); - *pgcounter = NUM_LV2ENTRIES; - pgtable_flush(pent, pent + NUM_LV2ENTRIES); - pgtable_flush(sent, sent + 1); - } - - return page_entry(sent, iova); -} - -static int lv1set_section(unsigned long *sent, phys_addr_t paddr, short *pgcnt) -{ - if (lv1ent_section(sent)) - return -EADDRINUSE; - - if (lv1ent_page(sent)) { - if (*pgcnt != NUM_LV2ENTRIES) - return -EADDRINUSE; - - kfree(page_entry(sent, 0)); - - *pgcnt = 0; - } - - *sent = mk_lv1ent_sect(paddr); - - pgtable_flush(sent, sent + 1); - - return 0; -} - -static int lv2set_page(unsigned long *pent, phys_addr_t paddr, size_t size, - short *pgcnt) -{ - if (size == SPAGE_SIZE) { - if (!lv2ent_fault(pent)) - return -EADDRINUSE; - - *pent = mk_lv2ent_spage(paddr); - pgtable_flush(pent, pent + 1); - *pgcnt -= 1; - } else { /* size == LPAGE_SIZE */ - int i; - for (i = 0; i < SPAGES_PER_LPAGE; i++, pent++) { - if (!lv2ent_fault(pent)) { - memset(pent, 0, sizeof(*pent) * i); - return -EADDRINUSE; - } - - *pent = mk_lv2ent_lpage(paddr); - } - pgtable_flush(pent - SPAGES_PER_LPAGE, pent); - *pgcnt -= SPAGES_PER_LPAGE; - } - - return 0; -} - -static int exynos_iommu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, size_t size, int prot) -{ - struct exynos_iommu_domain *priv = domain->priv; - unsigned long *entry; - unsigned long flags; - int ret = -ENOMEM; - - BUG_ON(priv->pgtable == NULL); - - spin_lock_irqsave(&priv->pgtablelock, flags); - - entry = section_entry(priv->pgtable, iova); - - if (size == SECT_SIZE) { - ret = lv1set_section(entry, paddr, - &priv->lv2entcnt[lv1ent_offset(iova)]); - } else { - unsigned long *pent; - - pent = alloc_lv2entry(entry, iova, - &priv->lv2entcnt[lv1ent_offset(iova)]); - - if (!pent) - ret = -ENOMEM; - else - ret = lv2set_page(pent, paddr, size, - &priv->lv2entcnt[lv1ent_offset(iova)]); - } - - if (ret) { - pr_debug("%s: Failed to map iova 0x%lx/0x%x bytes\n", - __func__, iova, size); - } - - spin_unlock_irqrestore(&priv->pgtablelock, flags); - - return ret; -} - -static size_t exynos_iommu_unmap(struct iommu_domain *domain, - unsigned long iova, size_t size) -{ - struct exynos_iommu_domain *priv = domain->priv; - struct sysmmu_drvdata *data; - unsigned long flags; - unsigned long *ent; - - BUG_ON(priv->pgtable == NULL); - - spin_lock_irqsave(&priv->pgtablelock, flags); - - ent = section_entry(priv->pgtable, iova); - - if (lv1ent_section(ent)) { - BUG_ON(size < SECT_SIZE); - - *ent = 0; - pgtable_flush(ent, ent + 1); - size = SECT_SIZE; - goto done; - } - - if (unlikely(lv1ent_fault(ent))) { - if (size > SECT_SIZE) - size = SECT_SIZE; - goto done; - } - - /* lv1ent_page(sent) == true here */ - - ent = page_entry(ent, iova); - - if (unlikely(lv2ent_fault(ent))) { - size = SPAGE_SIZE; - goto done; - } - - if (lv2ent_small(ent)) { - *ent = 0; - size = SPAGE_SIZE; - priv->lv2entcnt[lv1ent_offset(iova)] += 1; - goto done; - } - - /* lv1ent_large(ent) == true here */ - BUG_ON(size < LPAGE_SIZE); - - memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE); - - size = LPAGE_SIZE; - priv->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE; -done: - spin_unlock_irqrestore(&priv->pgtablelock, flags); - - spin_lock_irqsave(&priv->lock, flags); - list_for_each_entry(data, &priv->clients, node) - sysmmu_tlb_invalidate_entry(data->dev, iova); - spin_unlock_irqrestore(&priv->lock, flags); - - - return size; -} - -static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *domain, - dma_addr_t iova) -{ - struct exynos_iommu_domain *priv = domain->priv; - unsigned long *entry; - unsigned long flags; - phys_addr_t phys = 0; - - spin_lock_irqsave(&priv->pgtablelock, flags); - - entry = section_entry(priv->pgtable, iova); - - if (lv1ent_section(entry)) { - phys = section_phys(entry) + section_offs(iova); - } else if (lv1ent_page(entry)) { - entry = page_entry(entry, iova); - - if (lv2ent_large(entry)) - phys = lpage_phys(entry) + lpage_offs(iova); - else if (lv2ent_small(entry)) - phys = spage_phys(entry) + spage_offs(iova); - } - - spin_unlock_irqrestore(&priv->pgtablelock, flags); - - return phys; -} - -static struct iommu_ops exynos_iommu_ops = { - .domain_init = &exynos_iommu_domain_init, - .domain_destroy = &exynos_iommu_domain_destroy, - .attach_dev = &exynos_iommu_attach_device, - .detach_dev = &exynos_iommu_detach_device, - .map = &exynos_iommu_map, - .unmap = &exynos_iommu_unmap, - .iova_to_phys = &exynos_iommu_iova_to_phys, - .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE, -}; - -static int __init exynos_iommu_init(void) -{ - int ret; - - ret = platform_driver_register(&exynos_sysmmu_driver); - - if (ret == 0) - bus_set_iommu(&platform_bus_type, &exynos_iommu_ops); - - return ret; -} -subsys_initcall(exynos_iommu_init);
The driver has been unbuildable due to unfulfilled dependencies since 3.11, and even if enabled it won't build due to build breakage. Emails about status on this have gone unanswered, and fixes seem to have been abandoned. It's obvious that nobody cares about it, so let's remove it. Signed-off-by: Olof Johansson <olof@lixom.net> --- drivers/iommu/Kconfig | 21 - drivers/iommu/Makefile | 1 - drivers/iommu/exynos-iommu.c | 1035 ------------------------------------------ 3 files changed, 1057 deletions(-) delete mode 100644 drivers/iommu/exynos-iommu.c