lkml.org 
[lkml]   [2019]   [Dec]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/8] iommu/vt-d: Remove IOVA handling code from non-dma_ops path
Date
Remove all IOVA handling code from the non-dma_ops path in the intel
iommu driver.

There's no need for the non-dma_ops path to keep track of IOVAs. The
whole point of the non-dma_ops path is that it allows the IOVAs to be
handled separately. The IOVA handling code removed in this patch is
pointless.

Signed-off-by: Tom Murphy <murphyt7@tcd.ie>
---
drivers/iommu/intel-iommu.c | 89 ++++++++++++++-----------------------
1 file changed, 33 insertions(+), 56 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 64b1a9793daa..8d72ea0fb843 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1908,7 +1908,8 @@ static void domain_exit(struct dmar_domain *domain)
domain_remove_dev_info(domain);

/* destroy iovas */
- put_iova_domain(&domain->iovad);
+ if (domain->domain.type == IOMMU_DOMAIN_DMA)
+ put_iova_domain(&domain->iovad);

if (domain->pgd) {
struct page *freelist;
@@ -2671,19 +2672,9 @@ static struct dmar_domain *set_domain_for_dev(struct device *dev,
}

static int iommu_domain_identity_map(struct dmar_domain *domain,
- unsigned long long start,
- unsigned long long end)
+ unsigned long first_vpfn,
+ unsigned long last_vpfn)
{
- unsigned long first_vpfn = start >> VTD_PAGE_SHIFT;
- unsigned long last_vpfn = end >> VTD_PAGE_SHIFT;
-
- if (!reserve_iova(&domain->iovad, dma_to_mm_pfn(first_vpfn),
- dma_to_mm_pfn(last_vpfn))) {
- pr_err("Reserving iova failed\n");
- return -ENOMEM;
- }
-
- pr_debug("Mapping reserved region %llx-%llx\n", start, end);
/*
* RMRR range might have overlap with physical memory range,
* clear it first
@@ -2760,7 +2751,8 @@ static int __init si_domain_init(int hw)

for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
ret = iommu_domain_identity_map(si_domain,
- PFN_PHYS(start_pfn), PFN_PHYS(end_pfn));
+ mm_to_dma_pfn(start_pfn),
+ mm_to_dma_pfn(end_pfn));
if (ret)
return ret;
}
@@ -4593,58 +4585,37 @@ static int intel_iommu_memory_notifier(struct notifier_block *nb,
unsigned long val, void *v)
{
struct memory_notify *mhp = v;
- unsigned long long start, end;
- unsigned long start_vpfn, last_vpfn;
+ unsigned long start_vpfn = mm_to_dma_pfn(mhp->start_pfn);
+ unsigned long last_vpfn = mm_to_dma_pfn(mhp->start_pfn +
+ mhp->nr_pages - 1);

switch (val) {
case MEM_GOING_ONLINE:
- start = mhp->start_pfn << PAGE_SHIFT;
- end = ((mhp->start_pfn + mhp->nr_pages) << PAGE_SHIFT) - 1;
- if (iommu_domain_identity_map(si_domain, start, end)) {
- pr_warn("Failed to build identity map for [%llx-%llx]\n",
- start, end);
+ if (iommu_domain_identity_map(si_domain, start_vpfn,
+ last_vpfn)) {
+ pr_warn("Failed to build identity map for [%lx-%lx]\n",
+ start_vpfn, last_vpfn);
return NOTIFY_BAD;
}
break;

case MEM_OFFLINE:
case MEM_CANCEL_ONLINE:
- start_vpfn = mm_to_dma_pfn(mhp->start_pfn);
- last_vpfn = mm_to_dma_pfn(mhp->start_pfn + mhp->nr_pages - 1);
- while (start_vpfn <= last_vpfn) {
- struct iova *iova;
+ {
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
struct page *freelist;

- iova = find_iova(&si_domain->iovad, start_vpfn);
- if (iova == NULL) {
- pr_debug("Failed get IOVA for PFN %lx\n",
- start_vpfn);
- break;
- }
-
- iova = split_and_remove_iova(&si_domain->iovad, iova,
- start_vpfn, last_vpfn);
- if (iova == NULL) {
- pr_warn("Failed to split IOVA PFN [%lx-%lx]\n",
- start_vpfn, last_vpfn);
- return NOTIFY_BAD;
- }
-
- freelist = domain_unmap(si_domain, iova->pfn_lo,
- iova->pfn_hi);
+ freelist = domain_unmap(si_domain, start_vpfn,
+ last_vpfn);

rcu_read_lock();
for_each_active_iommu(iommu, drhd)
iommu_flush_iotlb_psi(iommu, si_domain,
- iova->pfn_lo, iova_size(iova),
+ start_vpfn, mhp->nr_pages,
!freelist, 0);
rcu_read_unlock();
dma_free_pagelist(freelist);
-
- start_vpfn = iova->pfn_hi + 1;
- free_iova_mem(iova);
}
break;
}
@@ -4672,8 +4643,9 @@ static void free_all_cpu_cached_iovas(unsigned int cpu)
for (did = 0; did < cap_ndoms(iommu->cap); did++) {
domain = get_iommu_domain(iommu, (u16)did);

- if (!domain)
+ if (!domain || domain->domain.type != IOMMU_DOMAIN_DMA)
continue;
+
free_cpu_cached_iovas(cpu, &domain->iovad);
}
}
@@ -5095,9 +5067,6 @@ static int md_domain_init(struct dmar_domain *domain, int guest_width)
{
int adjust_width;

- init_iova_domain(&domain->iovad, VTD_PAGE_SIZE, IOVA_START_PFN);
- domain_reserve_special_ranges(domain);
-
/* calculate AGAW */
domain->gaw = guest_width;
adjust_width = guestwidth_to_adjustwidth(guest_width);
@@ -5116,6 +5085,18 @@ static int md_domain_init(struct dmar_domain *domain, int guest_width)
return 0;
}

+static void intel_init_iova_domain(struct dmar_domain *dmar_domain)
+{
+ init_iova_domain(&dmar_domain->iovad, VTD_PAGE_SIZE, IOVA_START_PFN);
+ copy_reserved_iova(&reserved_iova_list, &dmar_domain->iovad);
+
+ if (init_iova_flush_queue(&dmar_domain->iovad, iommu_flush_iova,
+ iova_entry_free)) {
+ pr_warn("iova flush queue initialization failed\n");
+ intel_iommu_strict = 1;
+ }
+}
+
static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
{
struct dmar_domain *dmar_domain;
@@ -5136,12 +5117,8 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
return NULL;
}

- if (type == IOMMU_DOMAIN_DMA &&
- init_iova_flush_queue(&dmar_domain->iovad,
- iommu_flush_iova, iova_entry_free)) {
- pr_warn("iova flush queue initialization failed\n");
- intel_iommu_strict = 1;
- }
+ if (type == IOMMU_DOMAIN_DMA)
+ intel_init_iova_domain(dmar_domain);

domain_update_iommu_cap(dmar_domain);

--
2.20.1
\
 
 \ /
  Last update: 2019-12-21 16:05    [W:0.146 / U:1.980 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site