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iommu/vt-d: refactoring of deferred flush entries 

Currently, deferred flushes' info is striped between several lists in
the flush tables. Instead, move all information about a specific flush
to a single entry in this table.

This patch does not introduce any functional change.

Signed-off-by: Omer Peleg <omer@cs.technion.ac.il>
[mad@cs.technion.ac.il: rebased and reworded the commit message]
Signed-off-by: Adam Morrison <mad@cs.technion.ac.il>
Reviewed-by: Shaohua Li <shli@fb.com>
Reviewed-by: Ben Serebrin <serebrin@google.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Omer Peleg 2016-04-20 11:32:45 +03:00 committed by David Woodhouse
parent c3b46c7326
commit 314f1dc140
1 changed files with 31 additions and 21 deletions
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52
drivers/iommu/intel-iommu.c
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@ -458,15 +458,19 @@ static void flush_unmaps_timeout(unsigned long data);
static DEFINE_TIMER(unmap_timer, flush_unmaps_timeout, 0, 0);
#define HIGH_WATER_MARK 250
struct deferred_flush_tables {
int next;
struct iova *iova[HIGH_WATER_MARK];
struct dmar_domain *domain[HIGH_WATER_MARK];
struct page *freelist[HIGH_WATER_MARK];
struct deferred_flush_entry {
struct iova *iova;
struct dmar_domain *domain;
struct page *freelist;
};
static struct deferred_flush_tables *deferred_flush;
#define HIGH_WATER_MARK 250
struct deferred_flush_table {
int next;
struct deferred_flush_entry entries[HIGH_WATER_MARK];
};
static struct deferred_flush_table *deferred_flush;
/* bitmap for indexing intel_iommus */
static int g_num_of_iommus;
@ -3111,7 +3115,7 @@ static int __init init_dmars(void)
}
deferred_flush = kzalloc(g_num_of_iommus *
sizeof(struct deferred_flush_tables), GFP_KERNEL);
sizeof(struct deferred_flush_table), GFP_KERNEL);
if (!deferred_flush) {
ret = -ENOMEM;
goto free_g_iommus;
@ -3518,22 +3522,25 @@ static void flush_unmaps(void)
DMA_TLB_GLOBAL_FLUSH);
for (j = 0; j < deferred_flush[i].next; j++) {
unsigned long mask;
struct iova *iova = deferred_flush[i].iova[j];
struct dmar_domain *domain = deferred_flush[i].domain[j];
struct deferred_flush_entry *entry =
&deferred_flush->entries[j];
struct iova *iova = entry->iova;
struct dmar_domain *domain = entry->domain;
struct page *freelist = entry->freelist;
/* On real hardware multiple invalidations are expensive */
if (cap_caching_mode(iommu->cap))
iommu_flush_iotlb_psi(iommu, domain,
iova->pfn_lo, iova_size(iova),
!deferred_flush[i].freelist[j], 0);
!freelist, 0);
else {
mask = ilog2(mm_to_dma_pfn(iova_size(iova)));
iommu_flush_dev_iotlb(deferred_flush[i].domain[j],
iommu_flush_dev_iotlb(domain,
(uint64_t)iova->pfn_lo << PAGE_SHIFT, mask);
}
__free_iova(&deferred_flush[i].domain[j]->iovad, iova);
if (deferred_flush[i].freelist[j])
dma_free_pagelist(deferred_flush[i].freelist[j]);
__free_iova(&domain->iovad, iova);
if (freelist)
dma_free_pagelist(freelist);
}
deferred_flush[i].next = 0;
}
@ -3553,8 +3560,9 @@ static void flush_unmaps_timeout(unsigned long data)
static void add_unmap(struct dmar_domain *dom, struct iova *iova, struct page *freelist)
{
unsigned long flags;
int next, iommu_id;
int entry_id, iommu_id;
struct intel_iommu *iommu;
struct deferred_flush_entry *entry;
spin_lock_irqsave(&async_umap_flush_lock, flags);
if (list_size == HIGH_WATER_MARK)
@ -3563,11 +3571,13 @@ static void add_unmap(struct dmar_domain *dom, struct iova *iova, struct page *f
iommu = domain_get_iommu(dom);
iommu_id = iommu->seq_id;
next = deferred_flush[iommu_id].next;
deferred_flush[iommu_id].domain[next] = dom;
deferred_flush[iommu_id].iova[next] = iova;
deferred_flush[iommu_id].freelist[next] = freelist;
deferred_flush[iommu_id].next++;
entry_id = deferred_flush[iommu_id].next;
++(deferred_flush[iommu_id].next);
entry = &deferred_flush[iommu_id].entries[entry_id];
entry->domain = dom;
entry->iova = iova;
entry->freelist = freelist;
if (!timer_on) {
mod_timer(&unmap_timer, jiffies + msecs_to_jiffies(10));