github/acrn-hypervisor
1
0
Fork 0
mirror of https://github.com/projectacrn/acrn-hypervisor.git synced 2025-09-21 00:38:28 +00:00
Code Issues Projects Releases Wiki Activity

hv: Handle holes in GSI i.e. Global System Interrupt for multiple IO-APICs

Browse Source 
MADT is used to specify the GSI base for each IO-APIC and the number of
interrupt pins per IO-APIC is programmed into Max. Redir. Entry register of
that IO-APIC.

On platforms with multiple IO-APICs, there can be holes in the GSI space.
For example, on a platform with 2 IO-APICs, the following configuration has
a hole (from 24 to 31) in the GSI space.

IO-APIC 1: GSI base - 0, number of pins - 24
IO-APIC 2: GSI base - 32, number of pins - 8

This patch also adjusts the size for variables used to represent the total
number of IO-APICs on the system from uint16_t to uint8_t as the ACPI MADT
uses only 8-bits to indicate the unique IO-APIC IDs.

Tracked-On: #4151
Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com>
Acked-by: Eddie Dong <eddie.dong@Intel.com>
This commit is contained in:
Sainath Grandhi
2020-02-24 17:02:41 -08:00
committed by wenlingz
parent 85217e362f
commit f67ac09141
7 changed files with 124 additions and 135 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
hypervisor/boot/acpi_base.c
View File

@@ -209,14 +209,14 @@ local_parse_madt(struct acpi_table_madt *madt, uint32_t lapic_id_array[MAX_PCPU_
return pcpu_num;
}
static uint16_t
static uint8_t
ioapic_parse_madt(void *madt, struct ioapic_info *ioapic_id_array)
{
struct acpi_madt_ioapic *ioapic;
struct acpi_table_madt *madt_ptr;
void *first, *end, *iterator;
struct acpi_subtable_header *entry;
uint16_t ioapic_idx = 0U;
uint8_t ioapic_idx = 0U;
madt_ptr = (struct acpi_table_madt *)madt;
@@ -261,9 +261,9 @@ uint16_t parse_madt(uint32_t lapic_id_array[MAX_PCPU_NUM])
return ret;
}
uint16_t parse_madt_ioapic(struct ioapic_info *ioapic_id_array)
uint8_t parse_madt_ioapic(struct ioapic_info *ioapic_id_array)
{
uint16_t ret = 0U;
uint8_t ret = 0U;
struct acpi_table_rsdp *rsdp = NULL;
rsdp = get_rsdp();

2
hypervisor/boot/include/acpi.h
View File

@@ -203,7 +203,7 @@ void *get_acpi_tbl(const char *signature);
struct ioapic_info;
uint16_t parse_madt(uint32_t lapic_id_array[MAX_PCPU_NUM]);
uint16_t parse_madt_ioapic(struct ioapic_info *ioapic_id_array);
uint8_t parse_madt_ioapic(struct ioapic_info *ioapic_id_array);
#ifdef CONFIG_ACPI_PARSE_ENABLED
int32_t acpi_fixup(void);