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author | Marek Szyprowski <m.szyprowski@samsung.com> | 2016-02-18 15:12:53 +0100 |
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committer | Joerg Roedel <jroedel@suse.de> | 2016-02-25 15:32:09 +0100 |
commit | d093fc7e8390c3e46294290c0d76de93422a601f (patch) | |
tree | c7131468bea13d6bf9463df200e0b873c6001079 /drivers/iommu/exynos-iommu.c | |
parent | 02cdc365cfd0298fed2e757071b98fd2d180c31d (diff) | |
download | linux-stable-d093fc7e8390c3e46294290c0d76de93422a601f.tar.gz linux-stable-d093fc7e8390c3e46294290c0d76de93422a601f.tar.bz2 linux-stable-d093fc7e8390c3e46294290c0d76de93422a601f.zip |
iommu/exynos: Refactor fault handling code
This patch provides a new implementation for page fault handing code. The
new implementation is ready for future extensions. No functional changes
have been made.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/exynos-iommu.c')
-rw-r--r-- | drivers/iommu/exynos-iommu.c | 109 |
1 files changed, 41 insertions, 68 deletions
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 4275222cead3..3a577a473f3c 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -148,40 +148,25 @@ static sysmmu_pte_t *page_entry(sysmmu_pte_t *sent, sysmmu_iova_t iova) 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 -}; - -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 +/* + * IOMMU fault information register + */ +struct sysmmu_fault_info { + unsigned int bit; /* bit number in STATUS register */ + unsigned short addr_reg; /* register to read VA fault address */ + const char *name; /* human readable fault name */ + unsigned int type; /* fault type for report_iommu_fault */ }; -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" +static const struct sysmmu_fault_info sysmmu_faults[] = { + { 0, REG_PAGE_FAULT_ADDR, "PAGE", IOMMU_FAULT_READ }, + { 1, REG_AR_FAULT_ADDR, "AR MULTI-HIT", IOMMU_FAULT_READ }, + { 2, REG_AW_FAULT_ADDR, "AW MULTI-HIT", IOMMU_FAULT_WRITE }, + { 3, REG_DEFAULT_SLAVE_ADDR, "BUS ERROR", IOMMU_FAULT_READ }, + { 4, REG_AR_FAULT_ADDR, "AR SECURITY PROTECTION", IOMMU_FAULT_READ }, + { 5, REG_AR_FAULT_ADDR, "AR ACCESS PROTECTION", IOMMU_FAULT_READ }, + { 6, REG_AW_FAULT_ADDR, "AW SECURITY PROTECTION", IOMMU_FAULT_WRITE }, + { 7, REG_AW_FAULT_ADDR, "AW ACCESS PROTECTION", IOMMU_FAULT_WRITE }, }; /* @@ -299,24 +284,19 @@ static void __sysmmu_set_ptbase(struct sysmmu_drvdata *data, phys_addr_t pgd) __sysmmu_tlb_invalidate(data); } -static void show_fault_information(const char *name, - enum exynos_sysmmu_inttype itype, - phys_addr_t pgtable_base, sysmmu_iova_t fault_addr) +static void show_fault_information(struct sysmmu_drvdata *data, + const struct sysmmu_fault_info *finfo, + sysmmu_iova_t fault_addr) { sysmmu_pte_t *ent; - if ((itype >= SYSMMU_FAULTS_NUM) || (itype < SYSMMU_PAGEFAULT)) - itype = SYSMMU_FAULT_UNKNOWN; - - pr_err("%s occurred at %#x by %s(Page table base: %pa)\n", - sysmmu_fault_name[itype], fault_addr, name, &pgtable_base); - - ent = section_entry(phys_to_virt(pgtable_base), fault_addr); - pr_err("\tLv1 entry: %#x\n", *ent); - + dev_err(data->sysmmu, "%s FAULT occurred at %#x (page table base: %pa)\n", + finfo->name, fault_addr, &data->pgtable); + ent = section_entry(phys_to_virt(data->pgtable), fault_addr); + dev_err(data->sysmmu, "\tLv1 entry: %#x\n", *ent); if (lv1ent_page(ent)) { ent = page_entry(ent, fault_addr); - pr_err("\t Lv2 entry: %#x\n", *ent); + dev_err(data->sysmmu, "\t Lv2 entry: %#x\n", *ent); } } @@ -324,8 +304,10 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id) { /* SYSMMU is in blocked state when interrupt occurred. */ struct sysmmu_drvdata *data = dev_id; - enum exynos_sysmmu_inttype itype; - sysmmu_iova_t addr = -1; + const struct sysmmu_fault_info *finfo = sysmmu_faults; + int i, n = ARRAY_SIZE(sysmmu_faults); + unsigned int itype; + sysmmu_iova_t fault_addr = -1; int ret = -ENOSYS; WARN_ON(!is_sysmmu_active(data)); @@ -334,29 +316,20 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id) clk_enable(data->clk_master); - itype = (enum exynos_sysmmu_inttype) - __ffs(__raw_readl(data->sfrbase + REG_INT_STATUS)); - if (WARN_ON(!((itype >= 0) && (itype < SYSMMU_FAULT_UNKNOWN)))) - itype = SYSMMU_FAULT_UNKNOWN; - else - addr = __raw_readl(data->sfrbase + fault_reg_offset[itype]); + itype = __ffs(__raw_readl(data->sfrbase + REG_INT_STATUS)); + for (i = 0; i < n; i++, finfo++) + if (finfo->bit == itype) + break; + /* unknown/unsupported fault */ + BUG_ON(i == n); - if (itype == SYSMMU_FAULT_UNKNOWN) { - pr_err("%s: Fault is not occurred by System MMU '%s'!\n", - __func__, dev_name(data->sysmmu)); - pr_err("%s: Please check if IRQ is correctly configured.\n", - __func__); - BUG(); - } else { - unsigned int base = - __raw_readl(data->sfrbase + REG_PT_BASE_ADDR); - show_fault_information(dev_name(data->sysmmu), - itype, base, addr); - if (data->domain) - ret = report_iommu_fault(&data->domain->domain, - data->master, addr, itype); - } + /* print debug message */ + fault_addr = __raw_readl(data->sfrbase + finfo->addr_reg); + show_fault_information(data, finfo, fault_addr); + if (data->domain) + ret = report_iommu_fault(&data->domain->domain, + data->master, fault_addr, finfo->type); /* fault is not recovered by fault handler */ BUG_ON(ret != 0); |