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IOMMU Fixes for Linux v5.2-rc4

Browse Source 
Including:
 
 	- Three Fixes for Intel VT-d to fix a potential dead-lock, a
 	  formatting fix and a bit setting fix.
 
 	- One fix for the ARM-SMMU to make it work on some platforms
 	  with sub-optimal SMMU emulation.
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Merge tag 'iommu-fixes-v5.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull iommu fixes from Joerg Roedel:

 - three fixes for Intel VT-d to fix a potential dead-lock, a formatting
   fix and a bit setting fix

 - one fix for the ARM-SMMU to make it work on some platforms with
   sub-optimal SMMU emulation

* tag 'iommu-fixes-v5.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/arm-smmu: Avoid constant zero in TLBI writes
  iommu/vt-d: Set the right field for Page Walk Snoop
  iommu/vt-d: Fix lock inversion between iommu->lock and device_domain_lock
  iommu: Add missing new line for dma type
This commit is contained in:
Linus Torvalds 2019-06-14 05:49:35 -10:00
commit c78ad1be4b
4 changed files with 18 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/iommu/arm-smmu.c
View File

@ -47,6 +47,15 @@
#include "arm-smmu-regs.h"
/*
* Apparently, some Qualcomm arm64 platforms which appear to expose their SMMU
* global register space are still, in fact, using a hypervisor to mediate it
* by trapping and emulating register accesses. Sadly, some deployed versions
* of said trapping code have bugs wherein they go horribly wrong for stores
* using r31 (i.e. XZR/WZR) as the source register.
*/
#define QCOM_DUMMY_VAL -1
#define ARM_MMU500_ACTLR_CPRE (1 << 1)
#define ARM_MMU500_ACR_CACHE_LOCK (1 << 26)
@ -411,7 +420,7 @@ static void __arm_smmu_tlb_sync(struct arm_smmu_device *smmu,
{
unsigned int spin_cnt, delay;
writel_relaxed(0, sync);
writel_relaxed(QCOM_DUMMY_VAL, sync);
for (delay = 1; delay < TLB_LOOP_TIMEOUT; delay *= 2) {
for (spin_cnt = TLB_SPIN_COUNT; spin_cnt > 0; spin_cnt--) {
if (!(readl_relaxed(status) & sTLBGSTATUS_GSACTIVE))
@ -1751,8 +1760,8 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
}
/* Invalidate the TLB, just in case */
writel_relaxed(0, gr0_base + ARM_SMMU_GR0_TLBIALLH);
writel_relaxed(0, gr0_base + ARM_SMMU_GR0_TLBIALLNSNH);
writel_relaxed(QCOM_DUMMY_VAL, gr0_base + ARM_SMMU_GR0_TLBIALLH);
writel_relaxed(QCOM_DUMMY_VAL, gr0_base + ARM_SMMU_GR0_TLBIALLNSNH);
reg = readl_relaxed(ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);

7
drivers/iommu/intel-iommu.c
View File

@ -2504,6 +2504,7 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
}
}
spin_lock(&iommu->lock);
spin_lock_irqsave(&device_domain_lock, flags);
if (dev)
found = find_domain(dev);
@ -2519,17 +2520,16 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
if (found) {
spin_unlock_irqrestore(&device_domain_lock, flags);
spin_unlock(&iommu->lock);
free_devinfo_mem(info);
/* Caller must free the original domain */
return found;
}
spin_lock(&iommu->lock);
ret = domain_attach_iommu(domain, iommu);
spin_unlock(&iommu->lock);
if (ret) {
spin_unlock_irqrestore(&device_domain_lock, flags);
spin_unlock(&iommu->lock);
free_devinfo_mem(info);
return NULL;
}
@ -2539,6 +2539,7 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
if (dev)
dev->archdata.iommu = info;
spin_unlock_irqrestore(&device_domain_lock, flags);
spin_unlock(&iommu->lock);
/* PASID table is mandatory for a PCI device in scalable mode. */
if (dev && dev_is_pci(dev) && sm_supported(iommu)) {

2
drivers/iommu/intel-pasid.c
View File

@ -389,7 +389,7 @@ static inline void pasid_set_present(struct pasid_entry *pe)
*/
static inline void pasid_set_page_snoop(struct pasid_entry *pe, bool value)
{
pasid_set_bits(&pe->val[1], 1 << 23, value);
pasid_set_bits(&pe->val[1], 1 << 23, value << 23);
}
/*

2
drivers/iommu/iommu.c
View File

@ -329,7 +329,7 @@ static ssize_t iommu_group_show_type(struct iommu_group *group,
type = "unmanaged\n";
break;
case IOMMU_DOMAIN_DMA:
type = "DMA";
type = "DMA\n";
break;
}
}