diff options
| author | Baoquan He <bhe@redhat.com> | 2017-08-09 10:33:34 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2017-08-15 18:14:38 +0200 |
| commit | 78d313c611adcd354d35295e30f1495e02e005f9 (patch) | |
| tree | 6534c9129fd389485dd80ada121fc82d9909a0bd /drivers/iommu | |
| parent | iommu/amd: Detect pre enabled translation (diff) | |
| download | linux-78d313c611adcd354d35295e30f1495e02e005f9.tar.xz linux-78d313c611adcd354d35295e30f1495e02e005f9.zip | |
iommu/amd: Add several helper functions
Move single iommu enabling codes into a wrapper function early_enable_iommu().
This can make later kdump change easier.
And also add iommu_disable_command_buffer and iommu_disable_event_buffer
for later usage.
Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 42 |
1 files changed, 31 insertions, 11 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 3f72f44fa2df..277838dbc3a6 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -634,6 +634,14 @@ static void iommu_enable_command_buffer(struct amd_iommu *iommu) amd_iommu_reset_cmd_buffer(iommu); } +/* + * This function disables the command buffer + */ +static void iommu_disable_command_buffer(struct amd_iommu *iommu) +{ + iommu_feature_disable(iommu, CONTROL_CMDBUF_EN); +} + static void __init free_command_buffer(struct amd_iommu *iommu) { free_pages((unsigned long)iommu->cmd_buf, get_order(CMD_BUFFER_SIZE)); @@ -666,6 +674,14 @@ static void iommu_enable_event_buffer(struct amd_iommu *iommu) iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN); } +/* + * This function disables the event log buffer + */ +static void iommu_disable_event_buffer(struct amd_iommu *iommu) +{ + iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN); +} + static void __init free_event_buffer(struct amd_iommu *iommu) { free_pages((unsigned long)iommu->evt_buf, get_order(EVT_BUFFER_SIZE)); @@ -2046,6 +2062,19 @@ static void iommu_enable_ga(struct amd_iommu *iommu) #endif } +static void early_enable_iommu(struct amd_iommu *iommu) +{ + iommu_disable(iommu); + iommu_init_flags(iommu); + iommu_set_device_table(iommu); + iommu_enable_command_buffer(iommu); + iommu_enable_event_buffer(iommu); + iommu_set_exclusion_range(iommu); + iommu_enable_ga(iommu); + iommu_enable(iommu); + iommu_flush_all_caches(iommu); +} + /* * This function finally enables all IOMMUs found in the system after * they have been initialized @@ -2054,17 +2083,8 @@ static void early_enable_iommus(void) { struct amd_iommu *iommu; - for_each_iommu(iommu) { - iommu_disable(iommu); - iommu_init_flags(iommu); - iommu_set_device_table(iommu); - iommu_enable_command_buffer(iommu); - iommu_enable_event_buffer(iommu); - iommu_set_exclusion_range(iommu); - iommu_enable_ga(iommu); - iommu_enable(iommu); - iommu_flush_all_caches(iommu); - } + for_each_iommu(iommu) + early_enable_iommu(iommu); #ifdef CONFIG_IRQ_REMAP if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) |