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Subject[PATCH 3/8] x86/amd-iommu: Introduce function for iommu-local domain flush
Date
This patch introduces a function to flush all domain tlbs
for on one given IOMMU. This is required later to reset the
command buffer on one IOMMU.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu.c | 49 +++++++++++++++++++++++++++++--------------
1 files changed, 33 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index e62b35f..64cc582 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -465,38 +465,55 @@ static void iommu_flush_tlb_pde(struct amd_iommu *iommu, u16 domid)
}

/*
- * This function is used to flush the IO/TLB for a given protection domain
- * on every IOMMU in the system
+ * This function flushes one domain on one IOMMU
*/
-static void iommu_flush_domain(u16 domid)
+static void flush_domain_on_iommu(struct amd_iommu *iommu, u16 domid)
{
- unsigned long flags;
- struct amd_iommu *iommu;
struct iommu_cmd cmd;
-
- INC_STATS_COUNTER(domain_flush_all);
+ unsigned long flags;

__iommu_build_inv_iommu_pages(&cmd, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
domid, 1, 1);

- for_each_iommu(iommu) {
- spin_lock_irqsave(&iommu->lock, flags);
- __iommu_queue_command(iommu, &cmd);
- __iommu_completion_wait(iommu);
- __iommu_wait_for_completion(iommu);
- spin_unlock_irqrestore(&iommu->lock, flags);
- }
+ spin_lock_irqsave(&iommu->lock, flags);
+ __iommu_queue_command(iommu, &cmd);
+ __iommu_completion_wait(iommu);
+ __iommu_wait_for_completion(iommu);
+ spin_unlock_irqrestore(&iommu->lock, flags);
}

-void amd_iommu_flush_all_domains(void)
+static void flush_all_domains_on_iommu(struct amd_iommu *iommu)
{
int i;

for (i = 1; i < MAX_DOMAIN_ID; ++i) {
if (!test_bit(i, amd_iommu_pd_alloc_bitmap))
continue;
- iommu_flush_domain(i);
+ flush_domain_on_iommu(iommu, i);
}
+
+}
+
+/*
+ * This function is used to flush the IO/TLB for a given protection domain
+ * on every IOMMU in the system
+ */
+static void iommu_flush_domain(u16 domid)
+{
+ struct amd_iommu *iommu;
+
+ INC_STATS_COUNTER(domain_flush_all);
+
+ for_each_iommu(iommu)
+ flush_domain_on_iommu(iommu, domid);
+}
+
+void amd_iommu_flush_all_domains(void)
+{
+ struct amd_iommu *iommu;
+
+ for_each_iommu(iommu)
+ flush_all_domains_on_iommu(iommu);
}

void amd_iommu_flush_all_devices(void)
--
1.6.3.3



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