From 538d5b333216c3daa7a5821307164f10af73ec8c Mon Sep 17 00:00:00 2001
From: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Date: Wed, 20 Sep 2017 10:52:02 +0200
Subject: iommu/iova: Make rcache flush optional on IOVA allocation failure
Since IOVA allocation failure is not unusual case we need to flush
CPUs' rcache in hope we will succeed in next round.
However, it is useful to decide whether we need rcache flush step because
of two reasons:
- Not scalability. On large system with ~100 CPUs iterating and flushing
rcache for each CPU becomes serious bottleneck so we may want to defer it.
- free_cpu_cached_iovas() does not care about max PFN we are interested in.
Thus we may flush our rcaches and still get no new IOVA like in the
commonly used scenario:
if (dma_limit > DMA_BIT_MASK(32) && dev_is_pci(dev))
iova = alloc_iova_fast(iovad, iova_len, DMA_BIT_MASK(32) >> shift);
if (!iova)
iova = alloc_iova_fast(iovad, iova_len, dma_limit >> shift);
1. First alloc_iova_fast() call is limited to DMA_BIT_MASK(32) to get
PCI devices a SAC address
2. alloc_iova() fails due to full 32-bit space
3. rcaches contain PFNs out of 32-bit space so free_cpu_cached_iovas()
throws entries away for nothing and alloc_iova() fails again
4. Next alloc_iova_fast() call cannot take advantage of rcache since we
have just defeated caches. In this case we pick the slowest option
to proceed.
This patch reworks flushed_rcache local flag to be additional function
argument instead and control rcache flush step. Also, it updates all users
to do the flush as the last chance.
Signed-off-by: Tomasz Nowicki <Tomasz.Nowicki@caviumnetworks.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Nate Watterson <nwatters@codeaurora.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
include/linux/iova.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
(limited to 'include/linux/iova.h')
diff --git a/include/linux/iova.h b/include/linux/iova.h
index c696ee81054e..928442dda565 100644
--- a/include/linux/iova.h
+++ b/include/linux/iova.h
@@ -150,7 +150,7 @@ void queue_iova(struct iova_domain *iovad,
unsigned long pfn, unsigned long pages,
unsigned long data);
unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size,
- unsigned long limit_pfn);
+ unsigned long limit_pfn, bool flush_rcache);
struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
unsigned long pfn_hi);
void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
@@ -212,7 +212,8 @@ static inline void queue_iova(struct iova_domain *iovad,
static inline unsigned long alloc_iova_fast(struct iova_domain *iovad,
unsigned long size,
- unsigned long limit_pfn)
+ unsigned long limit_pfn,
+ bool flush_rcache)
{
return 0;
}
--
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