From: Thomas Gleixner Date: Tue, 19 Jul 2011 14:19:51 +0000 (+0200) Subject: locking, x86, iommu: Annotate iommu->register_lock as raw X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1f5b3c3fd2d73d6b30e9ef6dcbf131a791d5cbbd;p=linux-beck.git locking, x86, iommu: Annotate iommu->register_lock as raw The iommu->register_lock can be taken in atomic context and therefore must not be preempted on -rt - annotate it. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar --- diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 3dc9befa5aec..be4164b3ebe8 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -800,7 +800,7 @@ int alloc_iommu(struct dmar_drhd_unit *drhd) (unsigned long long)iommu->cap, (unsigned long long)iommu->ecap); - spin_lock_init(&iommu->register_lock); + raw_spin_lock_init(&iommu->register_lock); drhd->iommu = iommu; return 0; @@ -1062,7 +1062,7 @@ void dmar_disable_qi(struct intel_iommu *iommu) if (!ecap_qis(iommu->ecap)) return; - spin_lock_irqsave(&iommu->register_lock, flags); + raw_spin_lock_irqsave(&iommu->register_lock, flags); sts = dmar_readq(iommu->reg + DMAR_GSTS_REG); if (!(sts & DMA_GSTS_QIES)) @@ -1082,7 +1082,7 @@ void dmar_disable_qi(struct intel_iommu *iommu) IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, !(sts & DMA_GSTS_QIES), sts); end: - spin_unlock_irqrestore(&iommu->register_lock, flags); + raw_spin_unlock_irqrestore(&iommu->register_lock, flags); } /* @@ -1097,7 +1097,7 @@ static void __dmar_enable_qi(struct intel_iommu *iommu) qi->free_head = qi->free_tail = 0; qi->free_cnt = QI_LENGTH; - spin_lock_irqsave(&iommu->register_lock, flags); + raw_spin_lock_irqsave(&iommu->register_lock, flags); /* write zero to the tail reg */ writel(0, iommu->reg + DMAR_IQT_REG); @@ -1110,7 +1110,7 @@ static void __dmar_enable_qi(struct intel_iommu *iommu) /* Make sure hardware complete it */ IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_QIES), sts); - spin_unlock_irqrestore(&iommu->register_lock, flags); + raw_spin_unlock_irqrestore(&iommu->register_lock, flags); } /* @@ -1225,11 +1225,11 @@ void dmar_msi_unmask(struct irq_data *data) unsigned long flag; /* unmask it */ - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); writel(0, iommu->reg + DMAR_FECTL_REG); /* Read a reg to force flush the post write */ readl(iommu->reg + DMAR_FECTL_REG); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); } void dmar_msi_mask(struct irq_data *data) @@ -1238,11 +1238,11 @@ void dmar_msi_mask(struct irq_data *data) struct intel_iommu *iommu = irq_data_get_irq_handler_data(data); /* mask it */ - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); writel(DMA_FECTL_IM, iommu->reg + DMAR_FECTL_REG); /* Read a reg to force flush the post write */ readl(iommu->reg + DMAR_FECTL_REG); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); } void dmar_msi_write(int irq, struct msi_msg *msg) @@ -1250,11 +1250,11 @@ void dmar_msi_write(int irq, struct msi_msg *msg) struct intel_iommu *iommu = irq_get_handler_data(irq); unsigned long flag; - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); writel(msg->data, iommu->reg + DMAR_FEDATA_REG); writel(msg->address_lo, iommu->reg + DMAR_FEADDR_REG); writel(msg->address_hi, iommu->reg + DMAR_FEUADDR_REG); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); } void dmar_msi_read(int irq, struct msi_msg *msg) @@ -1262,11 +1262,11 @@ void dmar_msi_read(int irq, struct msi_msg *msg) struct intel_iommu *iommu = irq_get_handler_data(irq); unsigned long flag; - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); msg->data = readl(iommu->reg + DMAR_FEDATA_REG); msg->address_lo = readl(iommu->reg + DMAR_FEADDR_REG); msg->address_hi = readl(iommu->reg + DMAR_FEUADDR_REG); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); } static int dmar_fault_do_one(struct intel_iommu *iommu, int type, @@ -1303,7 +1303,7 @@ irqreturn_t dmar_fault(int irq, void *dev_id) u32 fault_status; unsigned long flag; - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); fault_status = readl(iommu->reg + DMAR_FSTS_REG); if (fault_status) printk(KERN_ERR "DRHD: handling fault status reg %x\n", @@ -1342,7 +1342,7 @@ irqreturn_t dmar_fault(int irq, void *dev_id) writel(DMA_FRCD_F, iommu->reg + reg + fault_index * PRIMARY_FAULT_REG_LEN + 12); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); dmar_fault_do_one(iommu, type, fault_reason, source_id, guest_addr); @@ -1350,14 +1350,14 @@ irqreturn_t dmar_fault(int irq, void *dev_id) fault_index++; if (fault_index >= cap_num_fault_regs(iommu->cap)) fault_index = 0; - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); } clear_rest: /* clear all the other faults */ fault_status = readl(iommu->reg + DMAR_FSTS_REG); writel(fault_status, iommu->reg + DMAR_FSTS_REG); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); return IRQ_HANDLED; } diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index c621c98c99da..bf4a63c2477c 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -932,7 +932,7 @@ static void iommu_set_root_entry(struct intel_iommu *iommu) addr = iommu->root_entry; - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); dmar_writeq(iommu->reg + DMAR_RTADDR_REG, virt_to_phys(addr)); writel(iommu->gcmd | DMA_GCMD_SRTP, iommu->reg + DMAR_GCMD_REG); @@ -941,7 +941,7 @@ static void iommu_set_root_entry(struct intel_iommu *iommu) IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_RTPS), sts); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); } static void iommu_flush_write_buffer(struct intel_iommu *iommu) @@ -952,14 +952,14 @@ static void iommu_flush_write_buffer(struct intel_iommu *iommu) if (!rwbf_quirk && !cap_rwbf(iommu->cap)) return; - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); writel(iommu->gcmd | DMA_GCMD_WBF, iommu->reg + DMAR_GCMD_REG); /* Make sure hardware complete it */ IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (!(val & DMA_GSTS_WBFS)), val); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); } /* return value determine if we need a write buffer flush */ @@ -986,14 +986,14 @@ static void __iommu_flush_context(struct intel_iommu *iommu, } val |= DMA_CCMD_ICC; - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); dmar_writeq(iommu->reg + DMAR_CCMD_REG, val); /* Make sure hardware complete it */ IOMMU_WAIT_OP(iommu, DMAR_CCMD_REG, dmar_readq, (!(val & DMA_CCMD_ICC)), val); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); } /* return value determine if we need a write buffer flush */ @@ -1032,7 +1032,7 @@ static void __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did, if (cap_write_drain(iommu->cap)) val |= DMA_TLB_WRITE_DRAIN; - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); /* Note: Only uses first TLB reg currently */ if (val_iva) dmar_writeq(iommu->reg + tlb_offset, val_iva); @@ -1042,7 +1042,7 @@ static void __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did, IOMMU_WAIT_OP(iommu, tlb_offset + 8, dmar_readq, (!(val & DMA_TLB_IVT)), val); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); /* check IOTLB invalidation granularity */ if (DMA_TLB_IAIG(val) == 0) @@ -1158,7 +1158,7 @@ static void iommu_disable_protect_mem_regions(struct intel_iommu *iommu) u32 pmen; unsigned long flags; - spin_lock_irqsave(&iommu->register_lock, flags); + raw_spin_lock_irqsave(&iommu->register_lock, flags); pmen = readl(iommu->reg + DMAR_PMEN_REG); pmen &= ~DMA_PMEN_EPM; writel(pmen, iommu->reg + DMAR_PMEN_REG); @@ -1167,7 +1167,7 @@ static void iommu_disable_protect_mem_regions(struct intel_iommu *iommu) IOMMU_WAIT_OP(iommu, DMAR_PMEN_REG, readl, !(pmen & DMA_PMEN_PRS), pmen); - spin_unlock_irqrestore(&iommu->register_lock, flags); + raw_spin_unlock_irqrestore(&iommu->register_lock, flags); } static int iommu_enable_translation(struct intel_iommu *iommu) @@ -1175,7 +1175,7 @@ static int iommu_enable_translation(struct intel_iommu *iommu) u32 sts; unsigned long flags; - spin_lock_irqsave(&iommu->register_lock, flags); + raw_spin_lock_irqsave(&iommu->register_lock, flags); iommu->gcmd |= DMA_GCMD_TE; writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); @@ -1183,7 +1183,7 @@ static int iommu_enable_translation(struct intel_iommu *iommu) IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_TES), sts); - spin_unlock_irqrestore(&iommu->register_lock, flags); + raw_spin_unlock_irqrestore(&iommu->register_lock, flags); return 0; } @@ -1192,7 +1192,7 @@ static int iommu_disable_translation(struct intel_iommu *iommu) u32 sts; unsigned long flag; - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); iommu->gcmd &= ~DMA_GCMD_TE; writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); @@ -1200,7 +1200,7 @@ static int iommu_disable_translation(struct intel_iommu *iommu) IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (!(sts & DMA_GSTS_TES)), sts); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); return 0; } @@ -3320,7 +3320,7 @@ static int iommu_suspend(void) for_each_active_iommu(iommu, drhd) { iommu_disable_translation(iommu); - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); iommu->iommu_state[SR_DMAR_FECTL_REG] = readl(iommu->reg + DMAR_FECTL_REG); @@ -3331,7 +3331,7 @@ static int iommu_suspend(void) iommu->iommu_state[SR_DMAR_FEUADDR_REG] = readl(iommu->reg + DMAR_FEUADDR_REG); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); } return 0; @@ -3358,7 +3358,7 @@ static void iommu_resume(void) for_each_active_iommu(iommu, drhd) { - spin_lock_irqsave(&iommu->register_lock, flag); + raw_spin_lock_irqsave(&iommu->register_lock, flag); writel(iommu->iommu_state[SR_DMAR_FECTL_REG], iommu->reg + DMAR_FECTL_REG); @@ -3369,7 +3369,7 @@ static void iommu_resume(void) writel(iommu->iommu_state[SR_DMAR_FEUADDR_REG], iommu->reg + DMAR_FEUADDR_REG); - spin_unlock_irqrestore(&iommu->register_lock, flag); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); } for_each_active_iommu(iommu, drhd) diff --git a/drivers/iommu/intr_remapping.c b/drivers/iommu/intr_remapping.c index 1a89d4a2cadf..b2443f1a13ef 100644 --- a/drivers/iommu/intr_remapping.c +++ b/drivers/iommu/intr_remapping.c @@ -409,7 +409,7 @@ static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode) addr = virt_to_phys((void *)iommu->ir_table->base); - spin_lock_irqsave(&iommu->register_lock, flags); + raw_spin_lock_irqsave(&iommu->register_lock, flags); dmar_writeq(iommu->reg + DMAR_IRTA_REG, (addr) | IR_X2APIC_MODE(mode) | INTR_REMAP_TABLE_REG_SIZE); @@ -420,7 +420,7 @@ static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode) IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_IRTPS), sts); - spin_unlock_irqrestore(&iommu->register_lock, flags); + raw_spin_unlock_irqrestore(&iommu->register_lock, flags); /* * global invalidation of interrupt entry cache before enabling @@ -428,7 +428,7 @@ static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode) */ qi_global_iec(iommu); - spin_lock_irqsave(&iommu->register_lock, flags); + raw_spin_lock_irqsave(&iommu->register_lock, flags); /* Enable interrupt-remapping */ iommu->gcmd |= DMA_GCMD_IRE; @@ -437,7 +437,7 @@ static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode) IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_IRES), sts); - spin_unlock_irqrestore(&iommu->register_lock, flags); + raw_spin_unlock_irqrestore(&iommu->register_lock, flags); } @@ -485,7 +485,7 @@ static void iommu_disable_intr_remapping(struct intel_iommu *iommu) */ qi_global_iec(iommu); - spin_lock_irqsave(&iommu->register_lock, flags); + raw_spin_lock_irqsave(&iommu->register_lock, flags); sts = dmar_readq(iommu->reg + DMAR_GSTS_REG); if (!(sts & DMA_GSTS_IRES)) @@ -498,7 +498,7 @@ static void iommu_disable_intr_remapping(struct intel_iommu *iommu) readl, !(sts & DMA_GSTS_IRES), sts); end: - spin_unlock_irqrestore(&iommu->register_lock, flags); + raw_spin_unlock_irqrestore(&iommu->register_lock, flags); } int __init intr_remapping_supported(void) diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 9310c699a37d..19728c462399 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -311,7 +311,7 @@ struct intel_iommu { u64 cap; u64 ecap; u32 gcmd; /* Holds TE, EAFL. Don't need SRTP, SFL, WBF */ - spinlock_t register_lock; /* protect register handling */ + raw_spinlock_t register_lock; /* protect register handling */ int seq_id; /* sequence id of the iommu */ int agaw; /* agaw of this iommu */ int msagaw; /* max sagaw of this iommu */