Commit-ID: 0a6d80c70b9150d6a9cf466d41955e374c2c9fab Gitweb: http://git.kernel.org/tip/0a6d80c70b9150d6a9cf466d41955e374c2c9fab Author: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com> AuthorDate: Fri, 24 Feb 2017 02:48:16 -0600 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Thu, 30 Mar 2017 09:53:53 +0200
drivers/iommu/amd: Clean up iommu_pc_get_set_reg() Clean up coding style and fix a bug in the 64-bit register read logic since it overwrites the upper 32-bit when reading the lower 32-bit. Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com> Signed-off-by: Borislav Petkov <b...@suse.de> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> Cc: Alexander Shishkin <alexander.shish...@linux.intel.com> Cc: Arnaldo Carvalho de Melo <a...@redhat.com> Cc: Jiri Olsa <jo...@redhat.com> Cc: Jörg Rödel <j...@8bytes.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Stephane Eranian <eran...@google.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Vince Weaver <vincent.wea...@maine.edu> Cc: io...@lists.linux-foundation.org Link: http://lkml.kernel.org/r/1487926102-13073-5-git-send-email-suravee.suthikulpa...@amd.com Signed-off-by: Ingo Molnar <mi...@kernel.org> --- drivers/iommu/amd_iommu_init.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 6130278..ce65a47 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -2763,22 +2763,25 @@ static int iommu_pc_get_set_reg_val(struct amd_iommu *iommu, if (WARN_ON((fxn > 0x28) || (fxn & 7))) return -ENODEV; - offset = (u32)(((0x40|bank) << 12) | (cntr << 8) | fxn); + offset = (u32)(((0x40 | bank) << 12) | (cntr << 8) | fxn); /* Limit the offset to the hw defined mmio region aperture */ - max_offset_lim = (u32)(((0x40|iommu->max_banks) << 12) | + max_offset_lim = (u32)(((0x40 | iommu->max_banks) << 12) | (iommu->max_counters << 8) | 0x28); if ((offset < MMIO_CNTR_REG_OFFSET) || (offset > max_offset_lim)) return -EINVAL; if (is_write) { - writel((u32)*value, iommu->mmio_base + offset); - writel((*value >> 32), iommu->mmio_base + offset + 4); + u64 val = *value & GENMASK_ULL(47, 0); + + writel((u32)val, iommu->mmio_base + offset); + writel((val >> 32), iommu->mmio_base + offset + 4); } else { *value = readl(iommu->mmio_base + offset + 4); *value <<= 32; - *value = readl(iommu->mmio_base + offset); + *value |= readl(iommu->mmio_base + offset); + *value &= GENMASK_ULL(47, 0); } return 0;
