[PATCH v3 29/57] x86: acpi: Add common Intel ACPI tables

Simon Glass
2020-09-06T21:43:37Z

Add various tables that are common to Intel CPUs. These functions can be
used by arch-specific CPU code.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

(no changes since v1)

arch/x86/cpu/intel_common/Makefile | 2 +
arch/x86/cpu/intel_common/acpi.c | 377 +++++++++++++++++++++++++++++
arch/x86/cpu/intel_common/cpu.c | 14 ++
arch/x86/include/asm/acpi_table.h | 22 ++
arch/x86/include/asm/cpu_common.h | 7 +
arch/x86/include/asm/intel_acpi.h | 52 ++++
drivers/core/Kconfig | 9 +
7 files changed, 483 insertions(+)
create mode 100644 arch/x86/cpu/intel_common/acpi.c
create mode 100644 arch/x86/include/asm/intel_acpi.h

diff --git a/arch/x86/cpu/intel_common/Makefile b/arch/x86/cpu/intel_common/Makefile
index f1d1513a981..4a5cf17e41d 100644
--- a/arch/x86/cpu/intel_common/Makefile
+++ b/arch/x86/cpu/intel_common/Makefile
@@ -2,6 +2,8 @@
#
# Copyright (c) 2016 Google, Inc

+obj-$(CONFIG_INTEL_ACPIGEN) += acpi.o
+
ifdef CONFIG_HAVE_MRC
obj-$(CONFIG_$(SPL_TPL_)X86_16BIT_INIT) += car.o
obj-$(CONFIG_$(SPL_TPL_)X86_32BIT_INIT) += me_status.o
diff --git a/arch/x86/cpu/intel_common/acpi.c b/arch/x86/cpu/intel_common/acpi.c
new file mode 100644
index 00000000000..a4d5fbd38a7
--- /dev/null
+++ b/arch/x86/cpu/intel_common/acpi.c
@@ -0,0 +1,377 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Generic Intel ACPI table generation
+ *
+ * Copyright (C) 2017 Intel Corp.
+ * Copyright 2019 Google LLC
+ *
+ * Modified from coreboot src/soc/intel/common/block/acpi.c
+ */
+
+#include <common.h>
+#include <bloblist.h>
+#include <cpu.h>
+#include <dm.h>
+#include <acpi/acpigen.h>
+#include <asm/acpigen.h>
+#include <asm/acpi_table.h>
+#include <asm/cpu.h>
+#include <asm/cpu_common.h>
+#include <asm/intel_acpi.h>
+#include <asm/ioapic.h>
+#include <asm/mpspec.h>
+#include <asm/smm.h>
+#include <asm/turbo.h>
+#include <asm/intel_gnvs.h>
+#include <asm/arch/iomap.h>
+#include <asm/arch/pm.h>
+#include <asm/arch/systemagent.h>
+#include <dm/acpi.h>
+#include <linux/err.h>
+#include <power/acpi_pmc.h>
+
+u32 acpi_fill_mcfg(u32 current)
+{
+ /* PCI Segment Group 0, Start Bus Number 0, End Bus Number is 255 */
+ current += acpi_create_mcfg_mmconfig((void *)current,
+ CONFIG_MMCONF_BASE_ADDRESS, 0, 0,
+ (CONFIG_SA_PCIEX_LENGTH >> 20)
+ - 1);
+ return current;
+}
+
+static int acpi_sci_irq(void)
+{
+ int sci_irq = 9;
+ uint scis;
+ int ret;
+
+ ret = arch_read_sci_irq_select();
+ if (IS_ERR_VALUE(ret))
+ return log_msg_ret("sci_irq", ret);
+ scis = ret;
+ scis &= SCI_IRQ_MASK;
+ scis >>= SCI_IRQ_SHIFT;
+
+ /* Determine how SCI is routed. */
+ switch (scis) {
+ case SCIS_IRQ9:
+ case SCIS_IRQ10:
+ case SCIS_IRQ11:
+ sci_irq = scis - SCIS_IRQ9 + 9;
+ break;
+ case SCIS_IRQ20:
+ case SCIS_IRQ21:
+ case SCIS_IRQ22:
+ case SCIS_IRQ23:
+ sci_irq = scis - SCIS_IRQ20 + 20;
+ break;
+ default:
+ log_warning("Invalid SCI route! Defaulting to IRQ9\n");
+ sci_irq = 9;
+ break;
+ }
+
+ log_debug("SCI is IRQ%d\n", sci_irq);
+
+ return sci_irq;
+}
+
+static unsigned long acpi_madt_irq_overrides(unsigned long current)
+{
+ int sci = acpi_sci_irq();
+ u16 flags = MP_IRQ_TRIGGER_LEVEL;
+
+ if (sci < 0)
+ return log_msg_ret("sci irq", sci);
+
+ /* INT_SRC_OVR */
+ current += acpi_create_madt_irqoverride((void *)current, 0, 0, 2, 0);
+
+ flags |= arch_madt_sci_irq_polarity(sci);
+
+ /* SCI */
+ current +=
+ acpi_create_madt_irqoverride((void *)current, 0, sci, sci, flags);
+
+ return current;
+}
+
+u32 acpi_fill_madt(u32 current)
+{
+ /* Local APICs */
+ current += acpi_create_madt_lapics(current);
+
+ /* IOAPIC */
+ current += acpi_create_madt_ioapic((void *)current, 2, IO_APIC_ADDR, 0);
+
+ return acpi_madt_irq_overrides(current);
+}
+
+void intel_acpi_fill_fadt(struct acpi_fadt *fadt)
+{
+ const u16 pmbase = IOMAP_ACPI_BASE;
+
+ /* Use ACPI 3.0 revision. */
+ fadt->header.revision = acpi_get_table_revision(ACPITAB_FADT);
+
+ fadt->sci_int = acpi_sci_irq();
+ fadt->smi_cmd = APM_CNT;
+ fadt->acpi_enable = APM_CNT_ACPI_ENABLE;
+ fadt->acpi_disable = APM_CNT_ACPI_DISABLE;
+ fadt->s4bios_req = 0x0;
+ fadt->pstate_cnt = 0;
+
+ fadt->pm1a_evt_blk = pmbase + PM1_STS;
+ fadt->pm1b_evt_blk = 0x0;
+ fadt->pm1a_cnt_blk = pmbase + PM1_CNT;
+ fadt->pm1b_cnt_blk = 0x0;
+
+ fadt->gpe0_blk = pmbase + GPE0_STS;
+
+ fadt->pm1_evt_len = 4;
+ fadt->pm1_cnt_len = 2;
+
+ /* GPE0 STS/EN pairs each 32 bits wide. */
+ fadt->gpe0_blk_len = 2 * GPE0_REG_MAX * sizeof(uint32_t);
+
+ fadt->flush_size = 0x400; /* twice of cache size */
+ fadt->flush_stride = 0x10; /* Cache line width */
+ fadt->duty_offset = 1;
+ fadt->day_alrm = 0xd;
+
+ fadt->flags = ACPI_FADT_WBINVD | ACPI_FADT_C1_SUPPORTED |
+ ACPI_FADT_C2_MP_SUPPORTED | ACPI_FADT_SLEEP_BUTTON |
+ ACPI_FADT_RESET_REGISTER | ACPI_FADT_SEALED_CASE |
+ ACPI_FADT_S4_RTC_WAKE | ACPI_FADT_PLATFORM_CLOCK;
+
+ fadt->reset_reg.space_id = 1;
+ fadt->reset_reg.bit_width = 8;
+ fadt->reset_reg.addrl = IO_PORT_RESET;
+ fadt->reset_value = RST_CPU | SYS_RST;
+
+ fadt->x_pm1a_evt_blk.space_id = 1;
+ fadt->x_pm1a_evt_blk.bit_width = fadt->pm1_evt_len * 8;
+ fadt->x_pm1a_evt_blk.addrl = pmbase + PM1_STS;
+
+ fadt->x_pm1b_evt_blk.space_id = 1;
+
+ fadt->x_pm1a_cnt_blk.space_id = 1;
+ fadt->x_pm1a_cnt_blk.bit_width = fadt->pm1_cnt_len * 8;
+ fadt->x_pm1a_cnt_blk.addrl = pmbase + PM1_CNT;
+
+ fadt->x_pm1b_cnt_blk.space_id = 1;
+
+ fadt->x_gpe1_blk.space_id = 1;
+}
+
+int intel_southbridge_write_acpi_tables(const struct udevice *dev,
+ struct acpi_ctx *ctx)
+{
+ int ret;
+
+ ret = acpi_write_dbg2_pci_uart(ctx, gd->cur_serial_dev,
+ ACPI_ACCESS_SIZE_DWORD_ACCESS);
+ if (ret)
+ return log_msg_ret("dbg2", ret);
+
+ ret = acpi_write_hpet(ctx);
+ if (ret)
+ return log_msg_ret("hpet", ret);
+
+ return 0;
+}
+
+__weak u32 acpi_fill_soc_wake(u32 generic_pm1_en,
+ const struct chipset_power_state *ps)
+{
+ return generic_pm1_en;
+}
+
+__weak int acpi_create_gnvs(struct acpi_global_nvs *gnvs)
+{
+ return 0;
+}
+
+int southbridge_inject_dsdt(const struct udevice *dev, struct acpi_ctx *ctx)
+{
+ struct acpi_global_nvs *gnvs;
+ int ret;
+
+ ret = bloblist_ensure_size(BLOBLISTT_ACPI_GNVS, sizeof(*gnvs),
+ (void **)&gnvs);
+ if (ret)
+ return log_msg_ret("bloblist", ret);
+ memset(gnvs, '\0', sizeof(*gnvs));
+
+ ret = acpi_create_gnvs(gnvs);
+ if (ret)
+ return log_msg_ret("gnvs", ret);
+
+ /*
+ * TODO(sjg at chromum.org): tell SMI about it
+ * smm_setup_structures(gnvs, NULL, NULL);
+ */
+
+ /* Add it to DSDT */
+ acpigen_write_scope(ctx, "\\");
+ acpigen_write_name_dword(ctx, "NVSA", (uintptr_t)gnvs);
+ acpigen_pop_len(ctx);
+
+ return 0;
+}
+
+static int calculate_power(int tdp, int p1_ratio, int ratio)
+{
+ u32 m;
+ u32 power;
+
+ /*
+ * M = ((1.1 - ((p1_ratio - ratio) * 0.00625)) / 1.1) ^ 2
+ *
+ * Power = (ratio / p1_ratio) * m * tdp
+ */
+
+ m = (110000 - ((p1_ratio - ratio) * 625)) / 11;
+ m = (m * m) / 1000;
+
+ power = ((ratio * 100000 / p1_ratio) / 100);
+ power *= (m / 100) * (tdp / 1000);
+ power /= 1000;
+
+ return power;
+}
+
+void generate_p_state_entries(struct acpi_ctx *ctx, int core,
+ int cores_per_package)
+{
+ int ratio_min, ratio_max, ratio_turbo, ratio_step;
+ int coord_type, power_max, num_entries;
+ int ratio, power, clock, clock_max;
+ bool turbo;
+
+ coord_type = cpu_get_coord_type();
+ ratio_min = cpu_get_min_ratio();
+ ratio_max = cpu_get_max_ratio();
+ clock_max = (ratio_max * cpu_get_bus_clock_khz()) / 1000;
+ turbo = (turbo_get_state() == TURBO_ENABLED);
+
+ /* Calculate CPU TDP in mW */
+ power_max = cpu_get_power_max();
+
+ /* Write _PCT indicating use of FFixedHW */
+ acpigen_write_empty_pct(ctx);
+
+ /* Write _PPC with no limit on supported P-state */
+ acpigen_write_ppc_nvs(ctx);
+ /* Write PSD indicating configured coordination type */
+ acpigen_write_psd_package(ctx, core, 1, coord_type);
+
+ /* Add P-state entries in _PSS table */
+ acpigen_write_name(ctx, "_PSS");
+
+ /* Determine ratio points */
+ ratio_step = PSS_RATIO_STEP;
+ do {
+ num_entries = ((ratio_max - ratio_min) / ratio_step) + 1;
+ if (((ratio_max - ratio_min) % ratio_step) > 0)
+ num_entries += 1;
+ if (turbo)
+ num_entries += 1;
+ if (num_entries > PSS_MAX_ENTRIES)
+ ratio_step += 1;
+ } while (num_entries > PSS_MAX_ENTRIES);
+
+ /* _PSS package count depends on Turbo */
+ acpigen_write_package(ctx, num_entries);
+
+ /* P[T] is Turbo state if enabled */
+ if (turbo) {
+ ratio_turbo = cpu_get_max_turbo_ratio();
+
+ /* Add entry for Turbo ratio */
+ acpigen_write_pss_package(ctx, clock_max + 1, /* MHz */
+ power_max, /* mW */
+ PSS_LATENCY_TRANSITION,/* lat1 */
+ PSS_LATENCY_BUSMASTER,/* lat2 */
+ ratio_turbo << 8, /* control */
+ ratio_turbo << 8); /* status */
+ num_entries -= 1;
+ }
+
+ /* First regular entry is max non-turbo ratio */
+ acpigen_write_pss_package(ctx, clock_max, /* MHz */
+ power_max, /* mW */
+ PSS_LATENCY_TRANSITION,/* lat1 */
+ PSS_LATENCY_BUSMASTER,/* lat2 */
+ ratio_max << 8, /* control */
+ ratio_max << 8); /* status */
+ num_entries -= 1;
+
+ /* Generate the remaining entries */
+ for (ratio = ratio_min + ((num_entries - 1) * ratio_step);
+ ratio >= ratio_min; ratio -= ratio_step) {
+ /* Calculate power at this ratio */
+ power = calculate_power(power_max, ratio_max, ratio);
+ clock = (ratio * cpu_get_bus_clock_khz()) / 1000;
+
+ acpigen_write_pss_package(ctx, clock, /* MHz */
+ power, /* mW */
+ PSS_LATENCY_TRANSITION,/* lat1 */
+ PSS_LATENCY_BUSMASTER,/* lat2 */
+ ratio << 8, /* control */
+ ratio << 8); /* status */
+ }
+ /* Fix package length */
+ acpigen_pop_len(ctx);
+}
+
+void generate_t_state_entries(struct acpi_ctx *ctx, int core,
+ int cores_per_package, struct acpi_tstate *entry,
+ int nentries)
+{
+ if (!nentries)
+ return;
+
+ /* Indicate SW_ALL coordination for T-states */
+ acpigen_write_tsd_package(ctx, core, cores_per_package, SW_ALL);
+
+ /* Indicate FixedHW so OS will use MSR */
+ acpigen_write_empty_ptc(ctx);
+
+ /* Set NVS controlled T-state limit */
+ acpigen_write_tpc(ctx, "\\TLVL");
+
+ /* Write TSS table for MSR access */
+ acpigen_write_tss_package(ctx, entry, nentries);
+}
+
+int acpi_generate_cpu_header(struct acpi_ctx *ctx, int core_id,
+ const struct acpi_cstate *c_state_map,
+ int num_cstates)
+{
+ bool is_first = !core_id;
+
+ /* Generate processor \_PR.CPUx */
+ acpigen_write_processor(ctx, core_id, is_first ? ACPI_BASE_ADDRESS : 0,
+ is_first ? 6 : 0);
+
+ /* Generate C-state tables */
+ acpigen_write_cst_package(ctx, c_state_map, num_cstates);
+
+ return 0;
+}
+
+int acpi_generate_cpu_package_final(struct acpi_ctx *ctx, int cores_per_package)
+{
+ /*
+ * PPKG is usually used for thermal management of the first and only
+ * package
+ */
+ acpigen_write_processor_package(ctx, "PPKG", 0, cores_per_package);
+
+ /* Add a method to notify processor nodes */
+ acpigen_write_processor_cnot(ctx, cores_per_package);
+
+ return 0;
+}
diff --git a/arch/x86/cpu/intel_common/cpu.c b/arch/x86/cpu/intel_common/cpu.c
index cb4ef84013a..d8a3d60ae72 100644
--- a/arch/x86/cpu/intel_common/cpu.c
+++ b/arch/x86/cpu/intel_common/cpu.c
@@ -291,3 +291,17 @@ int cpu_get_max_turbo_ratio(void)

return msr.lo & 0xff;
}
+
+int cpu_get_cores_per_package(void)
+{
+ struct cpuid_result result;
+ int cores = 1;
+
+ if (gd->arch.x86_vendor != X86_VENDOR_INTEL)
+ return 1;
+
+ result = cpuid_ext(0xb, 1);
+ cores = result.ebx & 0xff;
+
+ return cores;
+}
diff --git a/arch/x86/include/asm/acpi_table.h b/arch/x86/include/asm/acpi_table.h
index 1b7ff509516..3245e447813 100644
--- a/arch/x86/include/asm/acpi_table.h
+++ b/arch/x86/include/asm/acpi_table.h
@@ -76,4 +76,26 @@ ulong write_acpi_tables(ulong start);
*/
ulong acpi_get_rsdp_addr(void);

+/**
+ * arch_read_sci_irq_select() - Read the system-control interrupt number
+ *
+ * @returns value of IRQ register in the PMC
+ */
+int arch_read_sci_irq_select(void);
+
+/**
+ * arch_write_sci_irq_select() - Set the system-control interrupt number
+ *
+ * @scis: New value for IRQ register in the PMC
+ */
+int arch_write_sci_irq_select(uint scis);
+
+/**
+ * arch_madt_sci_irq_polarity() - Return the priority to use for the MADT
+ *
+ * @sci: System-control interrupt number
+ * @return priority to use (MP_IRQ_POLARITY_...)
+ */
+int arch_madt_sci_irq_polarity(int sci);
+
#endif /* __ASM_ACPI_TABLE_H__ */
diff --git a/arch/x86/include/asm/cpu_common.h b/arch/x86/include/asm/cpu_common.h
index a7b7112d417..48f56c2aad9 100644
--- a/arch/x86/include/asm/cpu_common.h
+++ b/arch/x86/include/asm/cpu_common.h
@@ -177,4 +177,11 @@ int cpu_get_power_max(void);
*/
int cpu_get_max_turbo_ratio(void);

+/**
+ * cpu_get_cores_per_package() - Get the number of CPU cores in each package
+ *
+ * @return number of cores
+ */
+int cpu_get_cores_per_package(void);
+
#endif
diff --git a/arch/x86/include/asm/intel_acpi.h b/arch/x86/include/asm/intel_acpi.h
new file mode 100644
index 00000000000..a5781f1af45
--- /dev/null
+++ b/arch/x86/include/asm/intel_acpi.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+ */
+
+#ifndef __ASM_INTEL_ACPI_H__
+#define __ASM_INTEL_ACPI_H__
+
+struct acpi_cstate;
+struct acpi_ctx;
+struct acpi_tstate;
+struct udevice;
+
+/**
+ * acpi_generate_cpu_header() - Start generating an ACPI CPU entry
+ *
+ * Generates the ACPI information for a CPU. After this, the caller should
+ * generate_p_state_entries(), generate_t_state_entries and then
+ * acpigen_pop_len() to close off this package.
+ *
+ * @ctx: ACPI context pointer
+ * @core_id: CPU core number, as numbered by the SoC
+ * @c_state_map: Information about each C state
+ * @num_cstates: Number of entries in @c_state_map
+ * @return 0 if OK, -ve on error
+ */
+int acpi_generate_cpu_header(struct acpi_ctx *ctx, int core_id,
+ const struct acpi_cstate *c_state_map,
+ int num_cstates);
+
+/**
+ * acpi_generate_cpu_package_final() - Write out the CPU PPKG entry
+ *
+ * This writes information about the CPUs in the package
+ *
+ * @ctx: ACPI context pointer
+ * @cores_per_package: Number of CPU cores in each package in the SoC
+ */
+int acpi_generate_cpu_package_final(struct acpi_ctx *ctx,
+ int cores_per_package);
+
+void generate_p_state_entries(struct acpi_ctx *ctx, int core,
+ int cores_per_package);
+void generate_t_state_entries(struct acpi_ctx *ctx, int core,
+ int cores_per_package, struct acpi_tstate *entry,
+ int nentries);
+int southbridge_inject_dsdt(const struct udevice *dev, struct acpi_ctx *ctx);
+
+int intel_southbridge_write_acpi_tables(const struct udevice *dev,
+ struct acpi_ctx *ctx);
+
+#endif /* __ASM_INTEL_ACPI_H__ */
diff --git a/drivers/core/Kconfig b/drivers/core/Kconfig
index 00d1d80dc38..1ca5d66141b 100644
--- a/drivers/core/Kconfig
+++ b/drivers/core/Kconfig
@@ -277,4 +277,13 @@ config ACPIGEN
things like generating device-specific tables and returning the ACPI
name of a device.

+config INTEL_ACPIGEN
+ bool "Support ACPI table generation for Intel SoCs"
+ depends on ACPIGEN
+ help
+ This option adds some functions used for programatic generation of
+ ACPI tables on Intel SoCs. This provides features for writing CPU
+ information such as P states and T stages. Also included is a way
+ to create a GNVS table and set it up.
+
endmenu
--
2.28.0.526.ge36021eeef-goog