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drivers/interrupt_controller: VT-D may manipulate the cache

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Depending on a VT-D capability, it might be necessary to flush objects
from the cache.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
This commit is contained in:
Tomasz Bursztyka 2021-02-10 13:38:08 +01:00 • committed by Anas Nashif
commit 149cef11ce
4 changed files with 25 additions and 0 deletions
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1
drivers/interrupt_controller/Kconfig.intel_vtd
View file

@ -7,6 +7,7 @@ menuconfig INTEL_VTD_ICTL
bool "Intel VT-D interrupt remapping controller" bool "Intel VT-D interrupt remapping controller"
depends on ACPI && X86 && 64BIT depends on ACPI && X86 && 64BIT
select PCIE_MSI_MULTI_VECTOR select PCIE_MSI_MULTI_VECTOR
select CACHE_MANAGEMENT
help help
Such interrupt remapping hardware is provided through Intel VT-D Such interrupt remapping hardware is provided through Intel VT-D
technology. It's being used, currently, only for MSI/MSI-X technology. It's being used, currently, only for MSI/MSI-X

20
drivers/interrupt_controller/intc_intel_vtd.c
View file

@ -17,6 +17,8 @@
#include <zephyr.h> #include <zephyr.h>
#include <cache.h>
#include <arch/x86/intel_vtd.h> #include <arch/x86/intel_vtd.h>
#include <drivers/interrupt_controller/intel_vtd.h> #include <drivers/interrupt_controller/intel_vtd.h>
#include <drivers/interrupt_controller/ioapic.h> #include <drivers/interrupt_controller/ioapic.h>
@ -74,6 +76,17 @@ static void vtd_send_cmd(const struct device *dev,
} }
} }
static void vtd_flush_irte_from_cache(const struct device *dev,
uint8_t irte_idx)
{
struct vtd_ictl_data *data = dev->data;
if (!data->pwc) {
sys_cache_data_range(&data->irte[irte_idx],
sizeof(struct vtd_irte), K_CACHE_WB);
}
}
static void vtd_qi_init(const struct device *dev) static void vtd_qi_init(const struct device *dev)
{ {
struct vtd_ictl_data *data = dev->data; struct vtd_ictl_data *data = dev->data;
@ -328,6 +341,8 @@ static int vtd_ictl_remap(const struct device *dev,
vtd_index_iec_invalidate(dev, irte_idx); vtd_index_iec_invalidate(dev, irte_idx);
vtd_flush_irte_from_cache(dev, irte_idx);
return 0; return 0;
} }
@ -417,6 +432,11 @@ static int vtd_ictl_init(const struct device *dev)
DEVICE_MMIO_MAP(dev, K_MEM_CACHE_NONE); DEVICE_MMIO_MAP(dev, K_MEM_CACHE_NONE);
if (vtd_read_reg64(dev, VTD_ECAP_REG) & VTD_ECAP_C) {
printk("Page walk coherency supported\n");
data->pwc = true;
}
vtd_fault_event_init(dev); vtd_fault_event_init(dev);
vtd_qi_init(dev); vtd_qi_init(dev);

1
drivers/interrupt_controller/intc_intel_vtd.h
View file

@ -114,6 +114,7 @@ struct vtd_ictl_data {
uint16_t fault_record_num; uint16_t fault_record_num;
uint16_t qi_tail; uint16_t qi_tail;
uint8_t fault_vector; uint8_t fault_vector;
bool pwc;
}; };
struct vtd_ictl_cfg { struct vtd_ictl_cfg {

3
include/arch/x86/intel_vtd.h
View file

@ -96,6 +96,9 @@
#define VTD_CAP_FRO(cap) \ #define VTD_CAP_FRO(cap) \
(((uint64_t)cap & VTD_CAP_FRO_MASK) >> VTD_CAP_FRO_POS) (((uint64_t)cap & VTD_CAP_FRO_MASK) >> VTD_CAP_FRO_POS)
/* Extended Capability Register details */
#define VTD_ECAP_C BIT(0)
/* Global Command Register details */ /* Global Command Register details */
#define VTD_GCMD_CFI 23 #define VTD_GCMD_CFI 23
#define VTD_GCMD_SIRTP 24 #define VTD_GCMD_SIRTP 24