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[Qemu-devel] [kvm-unit-tests PATCH 6/8] intel-iommu: use atomic ops for


From: Peter Xu
Subject: [Qemu-devel] [kvm-unit-tests PATCH 6/8] intel-iommu: use atomic ops for irte index alloc
Date: Fri, 30 Dec 2016 16:55:58 +0800

To allow concurrent allocation of irte index. Meanwhile, move the IRTE
setup debug line into the alloc since vtd_setup_msi() might not be the
only one to dump this info in the future.

Signed-off-by: Peter Xu <address@hidden>
---
 lib/x86/intel-iommu.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/lib/x86/intel-iommu.c b/lib/x86/intel-iommu.c
index 20b9240..a3ce678 100644
--- a/lib/x86/intel-iommu.c
+++ b/lib/x86/intel-iommu.c
@@ -13,6 +13,7 @@
 #include "intel-iommu.h"
 #include "libcflat.h"
 #include "pci.h"
+#include "atomic.h"
 
 /*
  * VT-d in QEMU currently only support 39 bits address width, which is
@@ -239,9 +240,13 @@ void vtd_map_range(uint16_t sid, iova_t iova, phys_addr_t 
pa, size_t size)
 
 static uint16_t vtd_intr_index_alloc(void)
 {
-       static int index_ctr = 0;
+       static volatile int index_ctr = 0;
+       int ctr;
+
        assert(index_ctr < 65535);
-       return index_ctr++;
+       ctr = atomic_inc_fetch(&index_ctr);
+       printf("INTR: alloc IRTE index %d\n", ctr);
+       return ctr;
 }
 
 static void vtd_setup_irte(struct pci_dev *dev, vtd_irte_t *irte,
@@ -296,7 +301,6 @@ bool vtd_setup_msi(struct pci_dev *dev, int vector, int 
dest_id)
        assert(sizeof(vtd_msi_addr_t) == 8);
        assert(sizeof(vtd_msi_data_t) == 4);
 
-       printf("INTR: setup IRTE index %d\n", index);
        vtd_setup_irte(dev, irte + index, vector, dest_id);
 
        msi_addr.handle_15 = index >> 15 & 1;
-- 
2.7.4




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