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Commit aa7a6c8e authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'iommu-fixes-v4.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu 

Pull IOMMU fixes from Joerg Roedel:
 "Three fixes:

   - Fix use of smp_processor_id() in preemptible code in the IOVA
     allocation code.  This got introduced with the scalability
     improvements in this release cycle.

   - A VT-d fix for out-of-bounds access of the iommu->domains array.
     The bug showed during suspend/resume.

   - AMD IOMMU fix to print the correct device id in the ACPI parsing
     code"

* tag 'iommu-fixes-v4.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/amd: Initialize devid variable before using it
  iommu/vt-d: Fix overflow of iommu->domains array
  iommu/iova: Disable preemption around use of this_cpu_ptr()
parents 1a0a02d1 6082ee72

drivers/iommu/amd_iommu_init.c

+1 −1
Original line number Diff line number Diff line
@@ -1107,13 +1107,13 @@ static int __init init_iommu_from_acpi(struct amd_iommu *iommu, 
				break;

			}



			devid = e->devid;

			DUMP_printk("  DEV_ACPI_HID(%s[%s])\t\tdevid: %02x:%02x.%x\n",

				    hid, uid,

				    PCI_BUS_NUM(devid),

				    PCI_SLOT(devid),

				    PCI_FUNC(devid));



			devid  = e->devid;

			flags = e->flags;



			ret = add_acpi_hid_device(hid, uid, &devid, false);

drivers/iommu/intel-iommu.c

+1 −1
Original line number Diff line number Diff line
@@ -4607,7 +4607,7 @@ static void free_all_cpu_cached_iovas(unsigned int cpu) 
		if (!iommu)

			continue;



		for (did = 0; did < 0xffff; did++) {

		for (did = 0; did < cap_ndoms(iommu->cap); did++) {

			domain = get_iommu_domain(iommu, did);



			if (!domain)

drivers/iommu/iova.c

+6 −2
Original line number Diff line number Diff line
@@ -420,8 +420,10 @@ alloc_iova_fast(struct iova_domain *iovad, unsigned long size, 


		/* Try replenishing IOVAs by flushing rcache. */

		flushed_rcache = true;

		preempt_disable();

		for_each_online_cpu(cpu)

			free_cpu_cached_iovas(cpu, iovad);

		preempt_enable();

		goto retry;

	}
@@ -749,7 +751,7 @@ static bool __iova_rcache_insert(struct iova_domain *iovad, 
	bool can_insert = false;

	unsigned long flags;



	cpu_rcache = this_cpu_ptr(rcache->cpu_rcaches);

	cpu_rcache = get_cpu_ptr(rcache->cpu_rcaches);

	spin_lock_irqsave(&cpu_rcache->lock, flags);



	if (!iova_magazine_full(cpu_rcache->loaded)) {
@@ -779,6 +781,7 @@ static bool __iova_rcache_insert(struct iova_domain *iovad, 
		iova_magazine_push(cpu_rcache->loaded, iova_pfn);



	spin_unlock_irqrestore(&cpu_rcache->lock, flags);

	put_cpu_ptr(rcache->cpu_rcaches);



	if (mag_to_free) {

		iova_magazine_free_pfns(mag_to_free, iovad);
@@ -812,7 +815,7 @@ static unsigned long __iova_rcache_get(struct iova_rcache *rcache, 
	bool has_pfn = false;

	unsigned long flags;



	cpu_rcache = this_cpu_ptr(rcache->cpu_rcaches);

	cpu_rcache = get_cpu_ptr(rcache->cpu_rcaches);

	spin_lock_irqsave(&cpu_rcache->lock, flags);



	if (!iova_magazine_empty(cpu_rcache->loaded)) {
@@ -834,6 +837,7 @@ static unsigned long __iova_rcache_get(struct iova_rcache *rcache, 
		iova_pfn = iova_magazine_pop(cpu_rcache->loaded, limit_pfn);



	spin_unlock_irqrestore(&cpu_rcache->lock, flags);

	put_cpu_ptr(rcache->cpu_rcaches);



	return iova_pfn;

}