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Date: Fri, 17 Jan 2014 20:25:03 +0800
From: Hanjun Guo <hanjun.guo@...aro.org>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Russell King - ARM Linux <linux@....linux.org.uk>
Cc: linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Grant Likely <grant.likely@...aro.org>,
Matthew Garrett <mjg59@...f.ucam.org>,
Olof Johansson <olof@...om.net>,
Linus Walleij <linus.walleij@...aro.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Rob Herring <robh@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Arnd Bergmann <arnd@...db.de>, patches@...aro.org,
linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
linaro-acpi@...ts.linaro.org, Charles.Garcia-Tobin@....com,
Hanjun Guo <hanjun.guo@...aro.org>
Subject: [PATCH 09/20] ARM64 / ACPI: Implement core functions for parsing MADT table
Implement core functions for parsing MADT table to get the information
about GIC cpu interface and GIC distributor to prepare for SMP and GIC
initialization.
Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
---
arch/arm64/include/asm/acpi.h | 3 +
drivers/acpi/plat/arm-core.c | 139 ++++++++++++++++++++++++++++++++++++++++-
drivers/acpi/tables.c | 21 +++++++
3 files changed, 162 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index e108d9c..c335c6d 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -83,6 +83,9 @@ void arch_fix_phys_package_id(int num, u32 slot);
extern int (*acpi_suspend_lowlevel)(void);
#define acpi_wakeup_address (0)
+#define MAX_GIC_CPU_INTERFACE 256
+#define MAX_GIC_DISTRIBUTOR 1 /* should be the same as MAX_GIC_NR */
+
#else /* !CONFIG_ACPI */
#define acpi_disabled 1 /* ACPI sometimes enabled on ARM */
#define acpi_noirq 1 /* ACPI sometimes enabled on ARM */
diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
index 1835b21..8ba3e6f 100644
--- a/drivers/acpi/plat/arm-core.c
+++ b/drivers/acpi/plat/arm-core.c
@@ -46,6 +46,16 @@ EXPORT_SYMBOL(acpi_disabled);
int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
EXPORT_SYMBOL(acpi_pci_disabled);
+/*
+ * Local interrupt controller address,
+ * GIC cpu interface base address on ARM/ARM64
+ */
+static u64 acpi_lapic_addr __initdata;
+
+#define BAD_MADT_ENTRY(entry, end) ( \
+ (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
+ ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
+
#define PREFIX "ACPI: "
/* FIXME: this function should be moved to topology.c when it is ready */
@@ -92,6 +102,115 @@ void __init __acpi_unmap_table(char *map, unsigned long size)
return;
}
+static int __init acpi_parse_madt(struct acpi_table_header *table)
+{
+ struct acpi_table_madt *madt = NULL;
+
+ madt = (struct acpi_table_madt *)table;
+ if (!madt) {
+ pr_warn(PREFIX "Unable to map MADT\n");
+ return -ENODEV;
+ }
+
+ if (madt->address) {
+ acpi_lapic_addr = (u64) madt->address;
+
+ pr_info(PREFIX "Local APIC address 0x%08x\n", madt->address);
+ }
+
+ return 0;
+}
+
+/*
+ * GIC structures on ARM are somthing like Local APIC structures on x86,
+ * which means GIC cpu interfaces for GICv2/v3. Every GIC structure in
+ * MADT table represents a cpu in the system.
+ *
+ * GIC distributor structures are somthing like IOAPIC on x86. GIC can
+ * be initialized with information in this structure.
+ *
+ * Please refer to chapter5.2.12.14/15 of ACPI 5.0
+ */
+
+static int __init
+acpi_parse_gic(struct acpi_subtable_header *header, const unsigned long end)
+{
+ struct acpi_madt_generic_interrupt *processor = NULL;
+
+ processor = (struct acpi_madt_generic_interrupt *)header;
+
+ if (BAD_MADT_ENTRY(processor, end))
+ return -EINVAL;
+
+ acpi_table_print_madt_entry(header);
+
+ return 0;
+}
+
+static int __init
+acpi_parse_gic_distributor(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ struct acpi_madt_generic_distributor *distributor = NULL;
+
+ distributor = (struct acpi_madt_generic_distributor *)header;
+
+ if (BAD_MADT_ENTRY(distributor, end))
+ return -EINVAL;
+
+ acpi_table_print_madt_entry(header);
+
+ return 0;
+}
+
+/*
+ * Parse GIC cpu interface related entries in MADT
+ * returns 0 on success, < 0 on error
+ */
+static int __init acpi_parse_madt_gic_entries(void)
+{
+ int count;
+
+ /*
+ * do a partial walk of MADT to determine how many CPUs
+ * we have including disabled CPUs
+ */
+ count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
+ acpi_parse_gic, MAX_GIC_CPU_INTERFACE);
+
+ if (!count) {
+ pr_err(PREFIX "No GIC entries present\n");
+ return -ENODEV;
+ } else if (count < 0) {
+ pr_err(PREFIX "Error parsing GIC entry\n");
+ return count;
+ }
+
+ return 0;
+}
+
+/*
+ * Parse GIC distributor related entries in MADT
+ * returns 0 on success, < 0 on error
+ */
+static int __init acpi_parse_madt_gic_distributor_entries(void)
+{
+ int count;
+
+ count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
+ acpi_parse_gic_distributor, MAX_GIC_DISTRIBUTOR);
+
+ if (!count) {
+ pr_err(PREFIX "No GIC distributor entries present\n");
+ return -ENODEV;
+ } else if (count < 0) {
+ pr_err(PREFIX "Error parsing GIC distributor entry\n");
+ return count;
+ }
+
+ return 0;
+}
+
int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
{
*irq = gsi_to_irq(gsi);
@@ -141,11 +260,29 @@ static int __init acpi_parse_fadt(struct acpi_table_header *table)
static void __init early_acpi_process_madt(void)
{
- return;
+ acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt);
}
static void __init acpi_process_madt(void)
{
+ int error;
+
+ if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
+
+ /*
+ * Parse MADT GIC cpu interface entries
+ */
+ error = acpi_parse_madt_gic_entries();
+ if (!error) {
+ /*
+ * Parse MADT GIC distributor entries
+ */
+ acpi_parse_madt_gic_distributor_entries();
+ }
+ }
+
+ pr_info("Using ACPI for processor (GIC) configuration information\n");
+
return;
}
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index d67a1fe..b3e4615 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -191,6 +191,27 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
}
break;
+ case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
+ {
+ struct acpi_madt_generic_interrupt *p =
+ (struct acpi_madt_generic_interrupt *)header;
+ printk(KERN_INFO PREFIX
+ "GIC (acpi_id[0x%04x] gic_id[0x%04x] %s)\n",
+ p->uid, p->gic_id,
+ (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
+ }
+ break;
+
+ case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
+ {
+ struct acpi_madt_generic_distributor *p =
+ (struct acpi_madt_generic_distributor *)header;
+ printk(KERN_INFO PREFIX
+ "GIC Distributor (id[0x%04x] address[0x%08llx] gsi_base[%d])\n",
+ p->gic_id, p->base_address, p->global_irq_base);
+ }
+ break;
+
default:
printk(KERN_WARNING PREFIX
"Found unsupported MADT entry (type = 0x%x)\n",
--
1.7.9.5
--
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