PWN-Hunter/android_kernel_xiaomi_sdm845
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

amd-iommu: disable cmd buffer and evt logging before reprogramming iommu

Browse Source 
The IOMMU spec states that IOMMU behavior may be undefined when the
IOMMU registers are rewritten while command or event buffer is enabled.
Disable them in IOMMU disable path.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Chris Wright 2009-06-15 15:53:45 +02:00 committed by Joerg Roedel
parent 42a49f965a
commit a8c485bb68
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/x86/kernel/amd_iommu_init.c
View File

@ -260,6 +260,14 @@ static void iommu_enable(struct amd_iommu *iommu)
static void iommu_disable(struct amd_iommu *iommu)
{
/* Disable command buffer */
iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
/* Disable event logging and event interrupts */
iommu_feature_disable(iommu, CONTROL_EVT_INT_EN);
iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
/* Disable IOMMU hardware itself */
iommu_feature_disable(iommu, CONTROL_IOMMU_EN);
}
@ -1042,6 +1050,7 @@ static void enable_iommus(void)
struct amd_iommu *iommu;
for_each_iommu(iommu) {
iommu_disable(iommu);
iommu_set_device_table(iommu);
iommu_enable_command_buffer(iommu);
iommu_enable_event_buffer(iommu);