[PATCH v7 13/15] ACPI / processor: Add acpi_map_madt_entry().
From: David Daney <hidden>
Date: 2016-05-24 22:36:39
Also in:
linux-acpi, lkml
Subsystem:
acpi, acpi component architecture (acpica), the rest · Maintainers:
"Rafael J. Wysocki", Saket Dumbre, Linus Torvalds
From: David Daney <redacted> Follow-on arm64 ACPI/NUMA patches need to map MADT entries very early (before kmalloc is usable). Add acpi_map_madt_entry() which, indirectly, uses early_memremap()/early_memunmap() to access the table and parse out the mpidr. The existing implementation of map_madt_entry() is modified to take a pointer to the MADT as a parameter and the callers adjusted. Signed-off-by: David Daney <redacted> --- drivers/acpi/processor_core.c | 26 ++++++++++++++++++++++---- include/acpi/processor.h | 1 + 2 files changed, 23 insertions(+), 4 deletions(-)
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 33a38d6..9125d7d 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c@@ -108,13 +108,12 @@ static int map_gicc_mpidr(struct acpi_subtable_header *entry, return -EINVAL; } -static phys_cpuid_t map_madt_entry(int type, u32 acpi_id) +static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt, + int type, u32 acpi_id) { unsigned long madt_end, entry; phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */ - struct acpi_table_madt *madt; - madt = get_madt_table(); if (!madt) return phys_id;
@@ -145,6 +144,25 @@ static phys_cpuid_t map_madt_entry(int type, u32 acpi_id) return phys_id; } +phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id) +{ + struct acpi_table_madt *madt = NULL; + acpi_size tbl_size; + phys_cpuid_t rv; + + acpi_get_table_with_size(ACPI_SIG_MADT, 0, + (struct acpi_table_header **)&madt, + &tbl_size); + if (!madt) + return PHYS_CPUID_INVALID; + + rv = map_madt_entry(madt, 1, acpi_id); + + early_acpi_os_unmap_memory(madt, tbl_size); + + return rv; +} + static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id) { struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -185,7 +203,7 @@ phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id) phys_id = map_mat_entry(handle, type, acpi_id); if (invalid_phys_cpuid(phys_id)) - phys_id = map_madt_entry(type, acpi_id); + phys_id = map_madt_entry(get_madt_table(), type, acpi_id); return phys_id; }
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 6f1805d..f473e66 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h@@ -309,6 +309,7 @@ static inline int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) /* in processor_core.c */ phys_cpuid_t acpi_get_phys_id(acpi_handle, int type, u32 acpi_id); +phys_cpuid_t acpi_map_madt_entry(u32 acpi_id); int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id); int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
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1.7.11.7