diff options
| author | Adrian Huang <ahuang12@lenovo.com> | 2020-01-09 06:02:50 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2020-01-17 13:05:56 +0300 |
| commit | 62dcee71608506ad83b0525aa1b53a78b3f1689a (patch) | |
| tree | 534789a5a1b3ee30048063985e45e73f254783bf | |
| parent | bde9e6b9ba755e35768261a5ea15541a4c4b4de8 (diff) | |
| download | linux-62dcee71608506ad83b0525aa1b53a78b3f1689a.tar.xz | |
iommu/amd: Replace two consecutive readl calls with one readq
Optimize the reigster reading by using readq instead of the two
consecutive readl calls.
Signed-off-by: Adrian Huang <ahuang12@lenovo.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index c5167fe0bd5f..cfdc4b60ccbe 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -1718,7 +1718,6 @@ static const struct attribute_group *amd_iommu_groups[] = { static int __init iommu_init_pci(struct amd_iommu *iommu) { int cap_ptr = iommu->cap_ptr; - u32 low, high; int ret; iommu->dev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(iommu->devid), @@ -1736,10 +1735,7 @@ static int __init iommu_init_pci(struct amd_iommu *iommu) amd_iommu_iotlb_sup = false; /* read extended feature bits */ - low = readl(iommu->mmio_base + MMIO_EXT_FEATURES); - high = readl(iommu->mmio_base + MMIO_EXT_FEATURES + 4); - - iommu->features = ((u64)high << 32) | low; + iommu->features = readq(iommu->mmio_base + MMIO_EXT_FEATURES); if (iommu_feature(iommu, FEATURE_GT)) { int glxval; |