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iommu/amd: Split amd_iommu_init function 

The hardware-initializtion part of the AMD IOMMU driver is
split out into a seperate function. This function can now be
called either from amd_iommu_init() itself or any other
place if the hardware needs to be ready earlier. This will
be used to implement interrupt remapping for AMD.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2012-03-01 15:57:53 +01:00
parent 6b21d18ed5
commit 8704a1ba47
2 changed files with 80 additions and 45 deletions
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123
drivers/iommu/amd_iommu_init.c
View File

@ -1424,10 +1424,40 @@ static struct syscore_ops amd_iommu_syscore_ops = {
.resume = amd_iommu_resume,
};
static void __init free_on_init_error(void)
{
amd_iommu_uninit_devices();
free_pages((unsigned long)amd_iommu_pd_alloc_bitmap,
get_order(MAX_DOMAIN_ID/8));
free_pages((unsigned long)amd_iommu_rlookup_table,
get_order(rlookup_table_size));
free_pages((unsigned long)amd_iommu_alias_table,
get_order(alias_table_size));
free_pages((unsigned long)amd_iommu_dev_table,
get_order(dev_table_size));
free_iommu_all();
free_unity_maps();
#ifdef CONFIG_GART_IOMMU
/*
* We failed to initialize the AMD IOMMU - try fallback to GART
* if possible.
*/
gart_iommu_init();
#endif
}
/*
* This is the core init function for AMD IOMMU hardware in the system.
* This function is called from the generic x86 DMA layer initialization
* code.
* This is the hardware init function for AMD IOMMU in the system.
* This function is called either from amd_iommu_init or from the interrupt
* remapping setup code.
*
* This function basically parses the ACPI table for AMD IOMMU (IVRS)
* three times:
@ -1446,16 +1476,21 @@ static struct syscore_ops amd_iommu_syscore_ops = {
* remapping requirements parsed out of the ACPI table in
* this last pass.
*
* After that the hardware is initialized and ready to go. In the last
* step we do some Linux specific things like registering the driver in
* the dma_ops interface and initializing the suspend/resume support
* functions. Finally it prints some information about AMD IOMMUs and
* the driver state and enables the hardware.
* After everything is set up the IOMMUs are enabled and the necessary
* hotplug and suspend notifiers are registered.
*/
static int __init amd_iommu_init(void)
int __init amd_iommu_init_hardware(void)
{
int i, ret = 0;
if (!amd_iommu_detected)
return -ENODEV;
if (amd_iommu_dev_table != NULL) {
/* Hardware already initialized */
return 0;
}
/*
* First parse ACPI tables to find the largest Bus/Dev/Func
* we need to handle. Upon this information the shared data
@ -1472,9 +1507,8 @@ static int __init amd_iommu_init(void)
alias_table_size = tbl_size(ALIAS_TABLE_ENTRY_SIZE);
rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE);
ret = -ENOMEM;
/* Device table - directly used by all IOMMUs */
ret = -ENOMEM;
amd_iommu_dev_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
get_order(dev_table_size));
if (amd_iommu_dev_table == NULL)
@ -1546,20 +1580,46 @@ static int __init amd_iommu_init(void)
enable_iommus();
amd_iommu_init_notifier();
register_syscore_ops(&amd_iommu_syscore_ops);
out:
return ret;
free:
free_on_init_error();
return ret;
}
/*
* This is the core init function for AMD IOMMU hardware in the system.
* This function is called from the generic x86 DMA layer initialization
* code.
*
* The function calls amd_iommu_init_hardware() to setup and enable the
* IOMMU hardware if this has not happened yet. After that the driver
* registers for the DMA-API and for the IOMMU-API as necessary.
*/
static int __init amd_iommu_init(void)
{
int ret = 0;
ret = amd_iommu_init_hardware();
if (ret)
goto out;
if (iommu_pass_through)
ret = amd_iommu_init_passthrough();
else
ret = amd_iommu_init_dma_ops();
if (ret)
goto free_disable;
goto free;
amd_iommu_init_api();
amd_iommu_init_notifier();
register_syscore_ops(&amd_iommu_syscore_ops);
if (iommu_pass_through)
goto out;
@ -1569,39 +1629,14 @@ static int __init amd_iommu_init(void)
printk(KERN_INFO "AMD-Vi: Lazy IO/TLB flushing enabled\n");
x86_platform.iommu_shutdown = disable_iommus;
out:
return ret;
free_disable:
free:
disable_iommus();
free:
amd_iommu_uninit_devices();
free_pages((unsigned long)amd_iommu_pd_alloc_bitmap,
get_order(MAX_DOMAIN_ID/8));
free_pages((unsigned long)amd_iommu_rlookup_table,
get_order(rlookup_table_size));
free_pages((unsigned long)amd_iommu_alias_table,
get_order(alias_table_size));
free_pages((unsigned long)amd_iommu_dev_table,
get_order(dev_table_size));
free_iommu_all();
free_unity_maps();
#ifdef CONFIG_GART_IOMMU
/*
* We failed to initialize the AMD IOMMU - try fallback to GART
* if possible.
*/
gart_iommu_init();
#endif
free_on_init_error();
goto out;
}

2
include/linux/amd-iommu.h
View File

@ -28,7 +28,7 @@ struct task_struct;
struct pci_dev;
extern int amd_iommu_detect(void);
extern int amd_iommu_init_hardware(void);
/**
* amd_iommu_enable_device_erratum() - Enable erratum workaround for device