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authorBin Meng <bmeng.cn@gmail.com>2015-06-23 12:18:52 +0800
committerSimon Glass <sjg@chromium.org>2015-07-14 18:03:17 -0600
commit07545d861ccc54aecbeaa51b264258b90912b856 (patch)
tree3e64d07fec4397bf2b7dc0433ca74b184b6c3318 /arch/x86/lib
parent7f5df8d42d8eb0fbdb6bf168fd530aa0f01b99c7 (diff)
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x86: Generate a valid MultiProcessor (MP) table
Implement write_mp_table() to create a minimal working MP table. This includes an MP floating table, a configuration table header and all of the 5 base configuration table entries. The I/O interrupt assignment table entry is created based on the same information used in the creation of PIRQ routing table from device tree. A check duplicated entry logic is applied to prevent writing multiple I/O interrupt entries with the same information. Use a Kconfig option GENERATE_MP_TABLE to tell U-Boot whether we need actually write the MP table at the F seg, just like we did for PIRQ routing and SFI tables. With MP table existence, linux kernel will switch to I/O APIC and local APIC to process all the peripheral interrupts instead of 8259 PICs. This takes full advantage of the multicore hardware and the SMP kernel. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/x86/lib')
-rw-r--r--arch/x86/lib/mpspec.c157
-rw-r--r--arch/x86/lib/tables.c5
2 files changed, 162 insertions, 0 deletions
diff --git a/arch/x86/lib/mpspec.c b/arch/x86/lib/mpspec.c
index 26d1025..f16fbcb 100644
--- a/arch/x86/lib/mpspec.c
+++ b/arch/x86/lib/mpspec.c
@@ -9,13 +9,18 @@
#include <common.h>
#include <cpu.h>
#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
#include <asm/cpu.h>
+#include <asm/irq.h>
#include <asm/ioapic.h>
#include <asm/lapic.h>
#include <asm/mpspec.h>
#include <asm/tables.h>
#include <dm/uclass-internal.h>
+DECLARE_GLOBAL_DATA_PTR;
+
struct mp_config_table *mp_write_floating_table(struct mp_floating_table *mf)
{
u32 mc;
@@ -223,3 +228,155 @@ u32 mptable_finalize(struct mp_config_table *mc)
return end;
}
+
+static void mptable_add_isa_interrupts(struct mp_config_table *mc, int bus_isa,
+ int apicid, int external_int2)
+{
+ int i;
+
+ mp_write_intsrc(mc, external_int2 ? MP_INT : MP_EXTINT,
+ MP_IRQ_TRIGGER_EDGE | MP_IRQ_POLARITY_HIGH,
+ bus_isa, 0, apicid, 0);
+ mp_write_intsrc(mc, MP_INT, MP_IRQ_TRIGGER_EDGE | MP_IRQ_POLARITY_HIGH,
+ bus_isa, 1, apicid, 1);
+ mp_write_intsrc(mc, external_int2 ? MP_EXTINT : MP_INT,
+ MP_IRQ_TRIGGER_EDGE | MP_IRQ_POLARITY_HIGH,
+ bus_isa, 0, apicid, 2);
+
+ for (i = 3; i < 16; i++)
+ mp_write_intsrc(mc, MP_INT,
+ MP_IRQ_TRIGGER_EDGE | MP_IRQ_POLARITY_HIGH,
+ bus_isa, i, apicid, i);
+}
+
+/*
+ * Check duplicated I/O interrupt assignment table entry, to make sure
+ * there is only one entry with the given bus, device and interrupt pin.
+ */
+static bool check_dup_entry(struct mpc_config_intsrc *intsrc_base,
+ int entry_num, int bus, int device, int pin)
+{
+ struct mpc_config_intsrc *intsrc = intsrc_base;
+ int i;
+
+ for (i = 0; i < entry_num; i++) {
+ if (intsrc->mpc_srcbus == bus &&
+ intsrc->mpc_srcbusirq == ((device << 2) | (pin - 1)))
+ break;
+ intsrc++;
+ }
+
+ return (i == entry_num) ? false : true;
+}
+
+static int mptable_add_intsrc(struct mp_config_table *mc,
+ int bus_isa, int apicid)
+{
+ struct mpc_config_intsrc *intsrc_base;
+ int intsrc_entries = 0;
+ const void *blob = gd->fdt_blob;
+ int node;
+ int len, count;
+ const u32 *cell;
+ int i;
+
+ /* Legacy Interrupts */
+ debug("Writing ISA IRQs\n");
+ mptable_add_isa_interrupts(mc, bus_isa, apicid, 0);
+
+ /* Get I/O interrupt information from device tree */
+ node = fdtdec_next_compatible(blob, 0, COMPAT_INTEL_IRQ_ROUTER);
+ if (node < 0) {
+ debug("%s: Cannot find irq router node\n", __func__);
+ return -ENOENT;
+ }
+
+ cell = fdt_getprop(blob, node, "intel,pirq-routing", &len);
+ if (!cell)
+ return -ENOENT;
+
+ if ((len % sizeof(struct pirq_routing)) == 0)
+ count = len / sizeof(struct pirq_routing);
+ else
+ return -EINVAL;
+
+ intsrc_base = (struct mpc_config_intsrc *)mp_next_mpc_entry(mc);
+
+ for (i = 0; i < count; i++) {
+ struct pirq_routing pr;
+
+ pr.bdf = fdt_addr_to_cpu(cell[0]);
+ pr.pin = fdt_addr_to_cpu(cell[1]);
+ pr.pirq = fdt_addr_to_cpu(cell[2]);
+
+ if (check_dup_entry(intsrc_base, intsrc_entries,
+ PCI_BUS(pr.bdf), PCI_DEV(pr.bdf), pr.pin)) {
+ debug("found entry for bus %d device %d INT%c, skipping\n",
+ PCI_BUS(pr.bdf), PCI_DEV(pr.bdf),
+ 'A' + pr.pin - 1);
+ cell += sizeof(struct pirq_routing) / sizeof(u32);
+ continue;
+ }
+
+ /* PIRQ[A-H] are always connected to I/O APIC INTPIN#16-23 */
+ mp_write_pci_intsrc(mc, MP_INT, PCI_BUS(pr.bdf),
+ PCI_DEV(pr.bdf), pr.pin, apicid,
+ pr.pirq + 16);
+ intsrc_entries++;
+ cell += sizeof(struct pirq_routing) / sizeof(u32);
+ }
+
+ return 0;
+}
+
+static void mptable_add_lintsrc(struct mp_config_table *mc, int bus_isa)
+{
+ mp_write_lintsrc(mc, MP_EXTINT,
+ MP_IRQ_TRIGGER_EDGE | MP_IRQ_POLARITY_HIGH,
+ bus_isa, 0, MP_APIC_ALL, 0);
+ mp_write_lintsrc(mc, MP_NMI,
+ MP_IRQ_TRIGGER_EDGE | MP_IRQ_POLARITY_HIGH,
+ bus_isa, 0, MP_APIC_ALL, 1);
+}
+
+u32 write_mp_table(u32 addr)
+{
+ struct mp_config_table *mc;
+ int ioapic_id, ioapic_ver;
+ int bus_isa = 0xff;
+ int ret;
+ u32 end;
+
+ /* 16 byte align the table address */
+ addr = ALIGN(addr, 16);
+
+ /* Write floating table */
+ mc = mp_write_floating_table((struct mp_floating_table *)addr);
+
+ /* Write configuration table header */
+ mp_config_table_init(mc);
+
+ /* Write processor entry */
+ mp_write_processor(mc);
+
+ /* Write bus entry */
+ mp_write_bus(mc, bus_isa, BUSTYPE_ISA);
+
+ /* Write I/O APIC entry */
+ ioapic_id = io_apic_read(IO_APIC_ID) >> 24;
+ ioapic_ver = io_apic_read(IO_APIC_VER) & 0xff;
+ mp_write_ioapic(mc, ioapic_id, ioapic_ver, IO_APIC_ADDR);
+
+ /* Write I/O interrupt assignment entry */
+ ret = mptable_add_intsrc(mc, bus_isa, ioapic_id);
+ if (ret)
+ debug("Failed to write I/O interrupt assignment table\n");
+
+ /* Write local interrupt assignment entry */
+ mptable_add_lintsrc(mc, bus_isa);
+
+ /* Finalize the MP table */
+ end = mptable_finalize(mc);
+
+ return end;
+}
diff --git a/arch/x86/lib/tables.c b/arch/x86/lib/tables.c
index 41c50bc..75ffbc1 100644
--- a/arch/x86/lib/tables.c
+++ b/arch/x86/lib/tables.c
@@ -6,6 +6,7 @@
#include <common.h>
#include <asm/sfi.h>
+#include <asm/mpspec.h>
#include <asm/tables.h>
u8 table_compute_checksum(void *v, int len)
@@ -46,4 +47,8 @@ void write_tables(void)
rom_table_end = write_sfi_table(rom_table_end);
rom_table_end = ALIGN(rom_table_end, 1024);
#endif
+#ifdef CONFIG_GENERATE_MP_TABLE
+ rom_table_end = write_mp_table(rom_table_end);
+ rom_table_end = ALIGN(rom_table_end, 1024);
+#endif
}