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Message-ID: <802c3d08-3941-4f5c-8616-1c7b7717735f@linux.alibaba.com>
Date: Tue, 9 Apr 2024 15:37:25 +0800
From: Ruidong Tian <tianruidong@...ux.alibaba.com>
To: Baolin Wang <baolin.wang@...ux.alibaba.com>, catalin.marinas@....com,
will@...nel.org, lpieralisi@...nel.org, guohanjun@...wei.com,
sudeep.holla@....com, xueshuai@...ux.alibaba.com,
linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, rafael@...nel.org, lenb@...nel.org,
tony.luck@...el.com, bp@...en8.de, linux-edac@...r.kernel.org
Cc: tianruidong@...ux.alibaba.com,
Tyler Baicar <baicar@...amperecomputing.com>
Subject: Re: [PATCH v2 1/2] ACPI/AEST: Initial AEST driver
在 2024/3/21 11:52, Baolin Wang 写道:
>
>
> On 2024/3/21 10:53, Ruidong Tian wrote:
>> From: Tyler Baicar <baicar@...amperecomputing.com>
>>
>> Add support for parsing the ARM Error Source Table and basic handling of
>> errors reported through both memory mapped and system register
>> interfaces.
>>
>> Assume system register interfaces are only registered with private
>> peripheral interrupts (PPIs); otherwise there is no guarantee the
>> core handling the error is the core which took the error and has the
>> syndrome info in its system registers.
>>
>> In kernel-first mode, all configuration is controlled by kernel, include
>> CE ce_threshold and interrupt enable/disable.
>>
>> All detected errors will be processed as follow:
>> - CE, DE: use a workqueue to log this hardware errors.
>> - UER, UEO: log it and call memory_failure in workquee.
>> - UC, UEU: panic in irq context.
>>
>> Signed-off-by: Tyler Baicar <baicar@...amperecomputing.com>
>> Signed-off-by: Ruidong Tian <tianruidong@...ux.alibaba.com>
>> ---
>> MAINTAINERS | 11 +
>> arch/arm64/include/asm/ras.h | 71 +++
>> drivers/acpi/arm64/Kconfig | 10 +
>> drivers/acpi/arm64/Makefile | 1 +
>> drivers/acpi/arm64/aest.c | 834 +++++++++++++++++++++++++++++++++++
>> include/linux/acpi_aest.h | 92 ++++
>> include/linux/cpuhotplug.h | 1 +
>> 7 files changed, 1020 insertions(+)
>> create mode 100644 arch/arm64/include/asm/ras.h
>> create mode 100644 drivers/acpi/arm64/aest.c
>> create mode 100644 include/linux/acpi_aest.h
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index dd5de540ec0b..34900d4bb677 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -330,6 +330,17 @@ L: linux-arm-kernel@...ts.infradead.org
>> (moderated for non-subscribers)
>> S: Maintained
>> F: drivers/acpi/arm64
>> +ACPI AEST
>> +M: Tyler Baicar <baicar@...amperecomputing.com>
>> +M: Ruidong Tian <tianruidond@...ux.alibaba.com>
>> +L: linux-acpi@...r.kernel.org
>> +L: linux-arm-kernel@...ts.infradead.org
>> +S: Supported
>> +F: arch/arm64/include/asm/ras.h
>> +F: drivers/acpi/arm64/aest.c
>> +F: include/linux/acpi_aest.h
>> +
>> +
>> ACPI FOR RISC-V (ACPI/riscv)
>> M: Sunil V L <sunilvl@...tanamicro.com>
>> L: linux-acpi@...r.kernel.org
>> diff --git a/arch/arm64/include/asm/ras.h b/arch/arm64/include/asm/ras.h
>> new file mode 100644
>> index 000000000000..04667f0de30f
>> --- /dev/null
>> +++ b/arch/arm64/include/asm/ras.h
>> @@ -0,0 +1,71 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +#ifndef __ASM_RAS_H
>> +#define __ASM_RAS_H
>> +
>> +#include <linux/types.h>
>> +#include <linux/bits.h>
>> +
>> +/* ERR<n>FR */
>> +#define ERR_FR_RP BIT(15)
>> +#define ERR_FR_CEC GENMASK_ULL(14, 12)
>> +
>> +#define ERR_FR_RP_SINGLE_COUNTER 0
>> +#define ERR_FR_RP_DOUBLE_COUNTER 1
>> +
>> +#define ERR_FR_CEC_0B_COUNTER 0
>> +#define ERR_FR_CEC_8B_COUNTER BIT(1)
>> +#define ERR_FR_CEC_16B_COUNTER BIT(2)
>> +
>> +/* ERR<n>STATUS */
>> +#define ERR_STATUS_AV BIT(31)
>> +#define ERR_STATUS_V BIT(30)
>> +#define ERR_STATUS_UE BIT(29)
>> +#define ERR_STATUS_ER BIT(28)
>> +#define ERR_STATUS_OF BIT(27)
>> +#define ERR_STATUS_MV BIT(26)
>> +#define ERR_STATUS_CE (BIT(25) | BIT(24))
>> +#define ERR_STATUS_DE BIT(23)
>> +#define ERR_STATUS_PN BIT(22)
>> +#define ERR_STATUS_UET (BIT(21) | BIT(20))
>> +#define ERR_STATUS_CI BIT(19)
>> +#define ERR_STATUS_IERR GENMASK_ULL(15, 8)
>> +#define ERR_STATUS_SERR GENMASK_ULL(7, 0)
>> +
>> +/* These bit is write-one-to-clear */
>> +#define ERR_STATUS_W1TC (ERR_STATUS_AV | ERR_STATUS_V |
>> ERR_STATUS_UE | \
>> + ERR_STATUS_ER | ERR_STATUS_OF | ERR_STATUS_MV | \
>> + ERR_STATUS_CE | ERR_STATUS_DE | ERR_STATUS_PN | \
>> + ERR_STATUS_UET | ERR_STATUS_CI)
>> +
>> +#define ERR_STATUS_UET_UC 0
>> +#define ERR_STATUS_UET_UEU 1
>> +#define ERR_STATUS_UET_UER 2
>> +#define ERR_STATUS_UET_UEO 3
>> +
>> +/* ERR<n>CTLR */
>> +#define ERR_CTLR_FI BIT(3)
>> +#define ERR_CTLR_UI BIT(2)
>> +
>> +/* ERR<n>ADDR */
>> +#define ERR_ADDR_AI BIT(61)
>> +#define ERR_ADDR_PADDR GENMASK_ULL(55, 0)
>> +
>> +/* ERR<n>MISC0 */
>> +
>> +/* ERR<n>FR.CEC == 0b010, ERR<n>FR.RP == 0 */
>> +#define ERR_MISC0_8B_OF BIT(39)
>> +#define ERR_MISC0_8B_CEC GENMASK_ULL(38, 32)
>> +
>> +/* ERR<n>FR.CEC == 0b100, ERR<n>FR.RP == 0 */
>> +#define ERR_MISC0_16B_OF BIT(47)
>> +#define ERR_MISC0_16B_CEC GENMASK_ULL(46, 32)
>> +
>> +struct ras_ext_regs {
>> + u64 err_fr;
>> + u64 err_ctlr;
>> + u64 err_status;
>> + u64 err_addr;
>> + u64 err_misc[4];
>> +};
>> +
>> +#endif /* __ASM_RAS_H */
>> diff --git a/drivers/acpi/arm64/Kconfig b/drivers/acpi/arm64/Kconfig
>> index b3ed6212244c..639db671c5cf 100644
>> --- a/drivers/acpi/arm64/Kconfig
>> +++ b/drivers/acpi/arm64/Kconfig
>> @@ -21,3 +21,13 @@ config ACPI_AGDI
>> config ACPI_APMT
>> bool
>> +
>> +config ACPI_AEST
>> + bool "ARM Error Source Table Support"
>> +
>> + help
>> + The Arm Error Source Table (AEST) provides details on ACPI
>> + extensions that enable kernel-first handling of errors in a
>> + system that supports the Armv8 RAS extensions.
>> +
>> + If set, the kernel will report and log hardware errors.
>> diff --git a/drivers/acpi/arm64/Makefile b/drivers/acpi/arm64/Makefile
>> index 143debc1ba4a..b5b740058c46 100644
>> --- a/drivers/acpi/arm64/Makefile
>> +++ b/drivers/acpi/arm64/Makefile
>> @@ -5,3 +5,4 @@ obj-$(CONFIG_ACPI_GTDT) += gtdt.o
>> obj-$(CONFIG_ACPI_APMT) += apmt.o
>> obj-$(CONFIG_ARM_AMBA) += amba.o
>> obj-y += dma.o init.o
>> +obj-$(CONFIG_ACPI_AEST) += aest.o
>> diff --git a/drivers/acpi/arm64/aest.c b/drivers/acpi/arm64/aest.c
>> new file mode 100644
>> index 000000000000..ab17aa5f5997
>> --- /dev/null
>> +++ b/drivers/acpi/arm64/aest.c
>> @@ -0,0 +1,834 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * ARM Error Source Table Support
>> + *
>> + * Copyright (c) 2021, Ampere Computing LLC
>> + * Copyright (c) 2021-2024, Alibaba Group.
>> + */
>> +
>> +#include <linux/acpi.h>
>> +#include <linux/acpi_aest.h>
>> +#include <linux/cpuhotplug.h>
>> +#include <linux/kernel.h>
>> +#include <linux/genalloc.h>
>> +#include <linux/llist.h>
>> +#include <acpi/actbl.h>
>> +#include <asm/ras.h>
>> +
>> +#undef pr_fmt
>> +#define pr_fmt(fmt) "ACPI AEST: " fmt
>> +
>> +#define CASE_READ(res, x) \
>> + case (x): { \
>> + res = read_sysreg_s(SYS_##x##_EL1); \
>> + break; \
>> + }
>> +
>> +#define CASE_WRITE(val, x) \
>> + case (x): { \
>> + write_sysreg_s((val), SYS_##x##_EL1); \
>> + break; \
>> + }
>> +
>> +#define for_each_implemented_record(index, node) \
>> + for ((index) = node->interface.record_start; \
>> + (index) < node->interface.record_end; \
>> + (index)++)
>> +
>> +#define AEST_LOG_PREFIX_BUFFER 64
>> +
>> +/*
>> + * This memory pool is only to be used to save AEST node in AEST irq
>> context.
>> + * There can be 500 AEST node at most.
>> + */
>> +#define AEST_NODE_ALLOCED_MAX 500
>> +
>> +static struct acpi_table_header *aest_table;
>> +
>> +static struct aest_node __percpu **aest_ppi_data;
>> +
>> +static int *ppi_irqs;
>> +static u8 num_ppi;
>> +static u8 ppi_idx;
>> +
>> +static struct work_struct aest_work;
>> +
>> +static struct gen_pool *aest_node_pool;
>> +static struct llist_head aest_node_llist;
>> +
>> +static u64 aest_sysreg_read(u64 __unused, u32 offset)
>> +{
>> + u64 res;
>> +
>> + switch (offset) {
>> + CASE_READ(res, ERXFR)
>> + CASE_READ(res, ERXCTLR)
>> + CASE_READ(res, ERXSTATUS)
>> + CASE_READ(res, ERXADDR)
>> + CASE_READ(res, ERXMISC0)
>> + CASE_READ(res, ERXMISC1)
>> + CASE_READ(res, ERXMISC2)
>> + CASE_READ(res, ERXMISC3)
>> + default :
>> + res = 0;
>> + }
>> + return res;
>> +}
>> +
>> +static void aest_sysreg_write(u64 base, u32 offset, u64 val)
>> +{
>> + switch (offset) {
>> + CASE_WRITE(val, ERXFR)
>> + CASE_WRITE(val, ERXCTLR)
>> + CASE_WRITE(val, ERXSTATUS)
>> + CASE_WRITE(val, ERXADDR)
>> + CASE_WRITE(val, ERXMISC0)
>> + CASE_WRITE(val, ERXMISC1)
>> + CASE_WRITE(val, ERXMISC2)
>> + CASE_WRITE(val, ERXMISC3)
>> + default :
>> + return;
>> + }
>> +}
>> +
>> +static u64 aest_iomem_read(u64 base, u32 offset)
>> +{
>> + return readq_relaxed((void *)(base + offset));
>> +}
>> +
>> +static void aest_iomem_write(u64 base, u32 offset, u64 val)
>> +{
>> + writeq_relaxed(val, (void *)(base + offset));
>> +}
>> +
>> +static void aest_print(struct aest_node_llist *lnode)
>> +{
>> + static atomic_t seqno = { 0 };
>> + unsigned int curr_seqno;
>> + char pfx_seq[AEST_LOG_PREFIX_BUFFER];
>> + int index;
>> + struct ras_ext_regs *regs;
>> +
>> + curr_seqno = atomic_inc_return(&seqno);
>> + snprintf(pfx_seq, sizeof(pfx_seq), "{%u}" HW_ERR, curr_seqno);
>> + pr_info("%sHardware error from %s\n", pfx_seq, lnode->node_name);
>> +
>> + switch (lnode->type) {
>> + case ACPI_AEST_PROCESSOR_ERROR_NODE:
>> + pr_err("%s Error from CPU%d\n", pfx_seq, lnode->id0);
>> + break;
>> + case ACPI_AEST_MEMORY_ERROR_NODE:
>> + pr_err("%s Error from memory at SRAT proximity domain 0x%x\n",
>> + pfx_seq, lnode->id0);
>> + break;
>> + case ACPI_AEST_SMMU_ERROR_NODE:
>> + pr_err("%s Error from SMMU IORT node 0x%x subcomponent 0x%x\n",
>> + pfx_seq, lnode->id0, lnode->id1);
>> + break;
>> + case ACPI_AEST_VENDOR_ERROR_NODE:
>> + pr_err("%s Error from vendor hid 0x%x uid 0x%x\n",
>> + pfx_seq, lnode->id0, lnode->id1);
>> + break;
>> + case ACPI_AEST_GIC_ERROR_NODE:
>> + pr_err("%s Error from GIC type 0x%x instance 0x%x\n",
>> + pfx_seq, lnode->id0, lnode->id1);
>> + break;
>> + default:
>> + pr_err("%s Unknown AEST node type\n", pfx_seq);
>> + return;
>> + }
>> +
>> + index = lnode->index;
>> + regs = lnode->regs;
>> +
>> + pr_err("%s ERR%uFR: 0x%llx\n", pfx_seq, index, regs->err_fr);
>> + pr_err("%s ERR%uCTRL: 0x%llx\n", pfx_seq, index, regs->err_ctlr);
>> + pr_err("%s ERR%uSTATUS: 0x%llx\n", pfx_seq, index,
>> regs->err_status);
>> + if (regs->err_status & ERR_STATUS_AV)
>> + pr_err("%s ERR%uADDR: 0x%llx\n", pfx_seq, index,
>> regs->err_addr);
>> +
>> + if (regs->err_status & ERR_STATUS_MV) {
>> + pr_err("%s ERR%uMISC0: 0x%llx\n", pfx_seq, index,
>> regs->err_misc[0]);
>> + pr_err("%s ERR%uMISC1: 0x%llx\n", pfx_seq, index,
>> regs->err_misc[1]);
>> + pr_err("%s ERR%uMISC2: 0x%llx\n", pfx_seq, index,
>> regs->err_misc[2]);
>> + pr_err("%s ERR%uMISC3: 0x%llx\n", pfx_seq, index,
>> regs->err_misc[3]);
>> + }
>> +}
>> +
>> +static void aest_handle_memory_failure(struct aest_node_llist *lnode)
>> +{
>> + unsigned long pfn;
>> + u64 addr;
>> +
>> + if (test_bit(lnode->index, &lnode->addressing_mode) ||
>> + (lnode->regs->err_addr & ERR_ADDR_AI))
>> + return;
>> +
>> + addr = lnode->regs->err_addr & (1UL << CONFIG_ARM64_PA_BITS);
>> + pfn = PHYS_PFN(addr);
>> +
>> + if (!pfn_valid(pfn)) {
>> + pr_warn(HW_ERR "Invalid physical address: %#llx\n", addr);
>> + return;
>> + }
>> +
>> + memory_failure(pfn, 0);
>> +}
>> +
>> +static void aest_node_pool_process(struct work_struct *__unused)
>> +{
>> + struct llist_node *head;
>> + struct aest_node_llist *lnode, *tmp;
>> + u64 status;
>> +
>> + head = llist_del_all(&aest_node_llist);
>> + if (!head)
>> + return;
>> +
>> + head = llist_reverse_order(head);
>> + llist_for_each_entry_safe(lnode, tmp, head, llnode) {
>> + aest_print(lnode);
>> +
>> + status = lnode->regs->err_status;
>> + if ((status & ERR_STATUS_UE) &&
>> + (status & ERR_STATUS_UET) > ERR_STATUS_UET_UEU)
>> + aest_handle_memory_failure(lnode);
>> + gen_pool_free(aest_node_pool, (unsigned long)lnode,
>> + sizeof(*lnode));
>> + }
>> +}
>> +
>> +static int aest_node_gen_pool_add(struct aest_node *node, int index,
>> + struct ras_ext_regs *regs)
>> +{
>> + struct aest_node_llist *list;
>> +
>> + if (!aest_node_pool)
>> + return -EINVAL;
>> +
>> + list = (void *)gen_pool_alloc(aest_node_pool, sizeof(*list));
>> + if (!list)
>> + return -ENOMEM;
>> +
>> + list->type = node->type;
>> + list->node_name = node->name;
>> + switch (node->type) {
>> + case ACPI_AEST_PROCESSOR_ERROR_NODE:
>> + list->id0 = node->spec.processor.processor_id;
>> + if (node->spec.processor.flags & (ACPI_AEST_PROC_FLAG_SHARED |
>> + ACPI_AEST_PROC_FLAG_GLOBAL))
>> + list->id0 = smp_processor_id();
>> +
>> + list->id1 = node->spec.processor.resource_type;
>> + break;
>> + case ACPI_AEST_MEMORY_ERROR_NODE:
>> + list->id0 = node->spec.memory.srat_proximity_domain;
>> + break;
>> + case ACPI_AEST_SMMU_ERROR_NODE:
>> + list->id0 = node->spec.smmu.iort_node_reference;
>> + list->id1 = node->spec.smmu.subcomponent_reference;
>> + break;
>> + case ACPI_AEST_VENDOR_ERROR_NODE:
>> + list->id0 = node->spec.vendor.acpi_hid;
>> + list->id1 = node->spec.vendor.acpi_uid;
>> + break;
>> + case ACPI_AEST_GIC_ERROR_NODE:
>> + list->id0 = node->spec.gic.interface_type;
>> + list->id1 = node->spec.gic.instance_id;
>> + break;
>> + default:
>> + list->id0 = 0;
>> + list->id1 = 0;
>> + }
>> +
>> + list->regs = regs;
>> + list->index = index;
>> + list->addressing_mode = node->interface.addressing_mode;
>> + llist_add(&list->llnode, &aest_node_llist);
>> +
>> + return 0;
>> +}
>> +
>> +static int aest_node_pool_init(void)
>> +{
>> + unsigned long addr, size;
>> + int rc;
>> +
>> + if (aest_node_pool)
>> + return 0;
>> +
>> + size = ilog2(sizeof(struct aest_node_llist));
>> + aest_node_pool = gen_pool_create(size, -1);
>> + if (!aest_node_pool)
>> + return -ENOMEM;
>> +
>> + addr = (unsigned long)vmalloc(PAGE_ALIGN(size *
>> AEST_NODE_ALLOCED_MAX));
>> + if (!addr)
>> + goto err_pool_alloc;
>> +
>> + rc = gen_pool_add(aest_node_pool, addr, size, -1);
>> + if (rc)
>> + goto err_pool_add;
>> +
>> + return 0;
>> +
>> +err_pool_add:
>> + vfree((void *)addr);
>> +
>> +err_pool_alloc:
>> + gen_pool_destroy(aest_node_pool);
>> +
>> + return -ENOMEM;
>> +}
>> +
>> +static void aest_log(struct aest_node *node, int index, struct
>> ras_ext_regs *regs)
>> +{
>> + if (!aest_node_gen_pool_add(node, index, regs))
>> + schedule_work(&aest_work);
>> +}
>> +
>> +/*
>> + * Each PE may has multi error record, you must selects an error
>> record to
>> + * be accessed through the Error Record System registers.
>> + */
>> +static inline void aest_select_record(struct aest_node *node, int i)
>> +{
>> + if (node->interface.type == ACPI_AEST_NODE_SYSTEM_REGISTER) {
>> + write_sysreg_s(i, SYS_ERRSELR_EL1);
>> + isb();
>> + }
>> +}
>> +
>> +/* Ensure all writes has taken effect. */
>> +static inline void aest_sync(struct aest_node *node)
>> +{
>> + if (node->interface.type == ACPI_AEST_NODE_SYSTEM_REGISTER)
>> + isb();
>> +}
>> +
>> +static int aest_proc(struct aest_node *node)
>> +{
>> + struct ras_ext_regs regs = {0};
>> + struct aest_access *access;
>> + int i, count = 0;
>> + u64 regs_p;
>> +
>> + for_each_implemented_record(i, node) {
>> +
>> + /* 1b: Error record at i index is not implemented */
>> + if (test_bit(i, &node->interface.record_implemented))
>> + continue;
>> +
>> + aest_select_record(node, i);
>> +
>> + access = node->access;
>> + regs_p = (u64)&node->interface.regs[i];
>> +
>> + regs.err_status = access->read(regs_p, ERXSTATUS);
>> + if (!(regs.err_status & ERR_STATUS_V))
>> + continue;
>> +
>> + count++;
>> +
>> + if (regs.err_status & ERR_STATUS_AV)
>> + regs.err_addr = access->read(regs_p, ERXADDR);
>> +
>> + regs.err_fr = access->read(regs_p, ERXFR);
>> + regs.err_ctlr = access->read(regs_p, ERXCTLR);
>> +
>> + if (regs.err_status & ERR_STATUS_MV) {
>> + regs.err_misc[0] = access->read(regs_p, ERXMISC0);
>> + regs.err_misc[1] = access->read(regs_p, ERXMISC1);
>> + regs.err_misc[2] = access->read(regs_p, ERXMISC2);
>> + regs.err_misc[3] = access->read(regs_p, ERXMISC3);
>> + }
>> +
>> + if (node->interface.flags & ACPI_AEST_INTERFACE_CLEAR_MISC) {
>> + access->write(regs_p, ERXMISC0, 0);
>> + access->write(regs_p, ERXMISC1, 0);
>> + access->write(regs_p, ERXMISC2, 0);
>> + access->write(regs_p, ERXMISC3, 0);
>> + } else
>> + access->write(regs_p, ERXMISC0,
>> + node->interface.ce_threshold[i]);
>> +
>> + aest_log(node, i, ®s);
>> +
>> + /* panic if unrecoverable and uncontainable error encountered */
>> + if ((regs.err_status & ERR_STATUS_UE) &&
>> + (regs.err_status & ERR_STATUS_UET) < ERR_STATUS_UET_UER)
>> + panic("AEST: unrecoverable error encountered");
>> +
>> + /* Write-one-to-clear the bits we've seen */
>> + regs.err_status &= ERR_STATUS_W1TC;
>> +
>> + /* Multi bit filed need to write all-ones to clear. */
>> + if (regs.err_status & ERR_STATUS_CE)
>> + regs.err_status |= ERR_STATUS_CE;
>> +
>> + /* Multi bit filed need to write all-ones to clear. */
>> + if (regs.err_status & ERR_STATUS_UET)
>> + regs.err_status |= ERR_STATUS_UET;
>> +
>> + access->write(regs_p, ERXSTATUS, regs.err_status);
>> +
>> + aest_sync(node);
>> + }
>> +
>> + return count;
>> +}
>> +
>> +static irqreturn_t aest_irq_func(int irq, void *input)
>> +{
>> + struct aest_node *node = input;
>> +
>> + if (aest_proc(node))
>> + return IRQ_HANDLED;
>> +
>> + return IRQ_NONE;
>> +}
>> +
>> +static int __init aest_register_gsi(u32 gsi, int trigger, void *data,
>> + irq_handler_t aest_irq_func)
>> +{
>> + int cpu, irq;
>> +
>> + irq = acpi_register_gsi(NULL, gsi, trigger, ACPI_ACTIVE_HIGH);
>> +
>> + if (irq == -EINVAL) {
>> + pr_err("failed to map AEST GSI %d\n", gsi);
>> + return -EINVAL;
>> + }
>
> IMO, should be:
> if (irq < 0) {
> pr_err("failed to map AEST GSI %d\n", gsi);
> return irq;
> }
>
>> +
>> + if (irq_is_percpu_devid(irq)) {
>> + ppi_irqs[ppi_idx] = irq;
>> + for_each_possible_cpu(cpu) {
>> + memcpy(per_cpu_ptr(aest_ppi_data[ppi_idx], cpu), data,
>> + sizeof(struct aest_node));
>> + }
>> + if (request_percpu_irq(irq, aest_irq_func, "AEST",
>> + aest_ppi_data[ppi_idx++])) {
>> + pr_err("failed to register AEST IRQ %d\n", irq);
>> + return -EINVAL;
>
> Do not override the error number.
>
>> + }
>> + } else {
>> + if (request_irq(irq, aest_irq_func, IRQF_SHARED, "AEST",
>> + data)) {
>> + pr_err("failed to register AEST IRQ %d\n", irq);
>> + return -EINVAL;
>
> ditto.
>
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int __init aest_init_interrupts(struct acpi_aest_hdr *hdr,
>> + struct aest_node *node)
>> +{
>> + struct acpi_aest_node_interrupt *interrupt;
>> + int i, trigger, ret = 0, err_ctlr, regs_p;
>> +
>> + interrupt = ACPI_ADD_PTR(struct acpi_aest_node_interrupt, hdr,
>> + hdr->node_interrupt_offset);
>> +
>> + for (i = 0; i < hdr->node_interrupt_count; i++, interrupt++) {
>> + trigger = (interrupt->flags & AEST_INTERRUPT_MODE) ?
>> + ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
>> + if (aest_register_gsi(interrupt->gsiv, trigger, node,
>> + aest_irq_func))
>> + ret = -EINVAL;
>
> Do not override the error number.
>
>> + }
>> +
>> + /* Ensure RAS interrupt is enabled */
>> + for_each_implemented_record(i, node) {
>> + /* 1b: Error record at i index is not implemented */
>> + if (test_bit(i, &node->interface.record_implemented))
>> + continue;
>> +
>> + aest_select_record(node, i);
>> +
>> + regs_p = (u64)&node->interface.regs[i];
>> +
>> + err_ctlr = node->access->read(regs_p, ERXCTLR);
>> +
>> + if (interrupt->type == ACPI_AEST_NODE_FAULT_HANDLING)
>> + err_ctlr |= ERR_CTLR_FI;
>> + if (interrupt->type == ACPI_AEST_NODE_ERROR_RECOVERY)
>> + err_ctlr |= ERR_CTLR_UI;
>> +
>> + node->access->write(regs_p, ERXCTLR, err_ctlr);
>> +
>> + aest_sync(node);
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static void __init set_aest_node_name(struct aest_node *node)
>> +{
>> + switch (node->type) {
>> + case ACPI_AEST_PROCESSOR_ERROR_NODE:
>> + node->name = kasprintf(GFP_KERNEL, "AEST-CPU%d",
>> + node->spec.processor.processor_id);
>> + break;
>> + case ACPI_AEST_MEMORY_ERROR_NODE:
>> + case ACPI_AEST_SMMU_ERROR_NODE:
>> + case ACPI_AEST_VENDOR_ERROR_NODE:
>> + case ACPI_AEST_GIC_ERROR_NODE:
>> + node->name = kasprintf(GFP_KERNEL, "AEST-%llx",
>> + node->interface.phy_addr);
>> + break;
>> + default:
>> + node->name = kasprintf(GFP_KERNEL, "AEST-Unkown-Node");
>
> IMO, better to check the return value for memory allocation.
>
>> + }
>> +}
>> +
>> +/* access type is decided by AEST interface type. */
>> +static struct aest_access aest_access[] = {
>> + [ACPI_AEST_NODE_SYSTEM_REGISTER] = {
>> + .read = aest_sysreg_read,
>> + .write = aest_sysreg_write,
>> + },
>> +
>> + [ACPI_AEST_NODE_MEMORY_MAPPED] = {
>> + .read = aest_iomem_read,
>> + .write = aest_iomem_write,
>> + },
>> + { }
>> +};
>> +
>> +/* In kernel-first mode, kernel will report every CE by default. */
>> +static void __init aest_set_ce_threshold(struct aest_node *node)
>> +{
>> + u64 regs_p, err_fr, err_fr_cec, err_fr_rp, err_misc0, ce_threshold;
>> + int i;
>> +
>> + for_each_implemented_record(i, node) {
>> + /* 1b: Error record at i index is not implemented */
>> + if (test_bit(i, &node->interface.record_implemented))
>> + continue;
>> +
>> + aest_select_record(node, i);
>> + regs_p = (u64)&node->interface.regs[i];
>> +
>> + err_fr = node->access->read(regs_p, ERXFR);
>> + err_fr_cec = FIELD_GET(ERR_FR_CEC, err_fr);
>> + err_fr_rp = FIELD_GET(ERR_FR_RP, err_fr);
>> + err_misc0 = node->access->read(regs_p, ERXMISC0);
>> +
>> + if (err_fr_cec == ERR_FR_CEC_0B_COUNTER)
>> + pr_debug("%s-%d do not support CE threshold!\n",
>> + node->name, i);
>> + else if (err_fr_cec == ERR_FR_CEC_8B_COUNTER &&
>> + err_fr_rp == ERR_FR_RP_SINGLE_COUNTER) {
>> + pr_debug("%s-%d support 8 bit CE threshold!\n",
>> + node->name, i);
>> + ce_threshold = err_misc0 | ERR_MISC0_8B_CEC;
>> + } else if (err_fr_cec == ERR_FR_CEC_16B_COUNTER &&
>> + err_fr_rp == ERR_FR_RP_SINGLE_COUNTER) {
>> + pr_debug("%s-%d support 16 bit CE threshold!\n",
>> + node->name, i);
>> + ce_threshold = err_misc0 | ERR_MISC0_16B_CEC;
>> + } else
>> + pr_debug("%s-%d do not support double counter yet!\n",
>> + node->name, i);
>
> Change to 'switch' statement will be more readable.
>
>> +
>> + node->access->write(regs_p, ERXMISC0, ce_threshold);
>> + node->interface.ce_threshold[i] = ce_threshold;
>> +
>> + aest_sync(node);
>> + }
>> +}
>> +
>> +static int __init aest_init_interface(struct acpi_aest_hdr *hdr,
>> + struct aest_node *node)
>> +{
>> + struct acpi_aest_node_interface *interface;
>> + struct resource *res;
>> + int size;
>> +
>> + interface = ACPI_ADD_PTR(struct acpi_aest_node_interface, hdr,
>> + hdr->node_interface_offset);
>> +
>> + if (interface->type >= ACPI_AEST_XFACE_RESERVED) {
>> + pr_err("invalid interface type: %d\n", interface->type);
>> + return -EINVAL;
>> + }
>> +
>> + node->interface.type = interface->type;
>> + node->interface.phy_addr = interface->address;
>> + node->interface.record_start = interface->error_record_index;
>> + node->interface.record_end = interface->error_record_index +
>> + interface->error_record_count;
>> + node->interface.flags = interface->flags;
>> + node->interface.record_implemented =
>> interface->error_record_implemented;
>> + node->interface.status_reporting =
>> interface->error_status_reporting;
>> + node->interface.addressing_mode = interface->addressing_mode;
>> + node->access = &aest_access[interface->type];
>> +
>> + /*
>> + * Currently SR based handling is done through the architected
>> + * discovery exposed through SRs. That may change in the future
>> + * if there is supplemental information in the AEST that is
>> + * needed.
>> + */
>> + if (interface->type == ACPI_AEST_NODE_SYSTEM_REGISTER)
>> + return 0;
>> +
>> + res = kzalloc(sizeof(struct resource), GFP_KERNEL);
>> + if (!res)
>> + return -ENOMEM;
>> +
>> + size = interface->error_record_count * sizeof(struct ras_ext_regs);
>> + res->name = "AEST";
>> + res->start = interface->address;
>> + res->end = res->start + size;
>> + res->flags = IORESOURCE_MEM;
>> +
>> + if (insert_resource(&iomem_resource, res)) {
>> + pr_notice("request region conflict with %s\n",
>> + res->name);
>> + }
>> +
>> + node->interface.regs = ioremap(res->start, size);
>> + if (!node->interface.regs) {
>> + pr_err("Ioremap for %s failed!\n", node->name);
>> + kfree(res);
>> + return -EINVAL;
>
> return -ENOMEM;
>
>> + }
>> +
>> + node->interface.ce_threshold = kzalloc(sizeof(u64) *
>> + interface->error_record_count, GFP_KERNEL);
>> + if (!node->interface.ce_threshold)
>
> kfree(res) and iounmap()
>
>> + return -ENOMEM;
>> +
>> + aest_set_ce_threshold(node);
>> +
>> + return 0;
>> +}
>> +
>> +static int __init aest_init_common(struct acpi_aest_hdr *hdr,
>> + struct aest_node *node)
>> +{
>> + int ret;
>> +
>> + set_aest_node_name(node);
>> +
>> + ret = aest_init_interface(hdr, node);
>> + if (ret) {
>> + pr_err("failed to init interface\n");
>> + return ret;
>
> I did not see you free the node->name before returning an error.
>
>> + }
>> +
>> + return aest_init_interrupts(hdr, node);
>> +}
>> +
>> +static int __init aest_init_node_default(struct acpi_aest_hdr *hdr)
>> +{
>> + struct aest_node *node;
>> + union aest_node_spec *node_spec;
>> + int ret;
>> +
>> + node = kzalloc(sizeof(struct aest_node), GFP_KERNEL);
>> + if (!node)
>> + return -ENOMEM;
>> +
>> + node->type = hdr->type;
>> + node_spec = ACPI_ADD_PTR(union aest_node_spec, hdr,
>> + hdr->node_specific_offset);
>> +
>> + memcpy(&node->spec, node_spec,
>> + hdr->node_interface_offset - hdr->node_specific_offset);
>> +
>> + ret = aest_init_common(hdr, node);
>> + if (ret)
>> + kfree(node);
>> +
>> + return ret;
>> +}
>> +
>> +static int __init aest_init_processor_node(struct acpi_aest_hdr *hdr)
>> +{
>> + struct aest_node *node;
>> + union aest_node_spec *node_spec;
>> + union aest_node_processor *proc;
>> + int ret;
>> +
>> + node = kzalloc(sizeof(struct aest_node), GFP_KERNEL);
>> + if (!node)
>> + return -ENOMEM;
>> +
>> + node->type = hdr->type;
>> + node_spec = ACPI_ADD_PTR(union aest_node_spec, hdr,
>> + hdr->node_specific_offset);
>> +
>> + memcpy(&node->spec, node_spec,
>> + hdr->node_interface_offset - hdr->node_specific_offset);
>> +
>> + proc = ACPI_ADD_PTR(union aest_node_processor, node_spec,
>> + sizeof(acpi_aest_processor));
>> +
>> + switch (node->spec.processor.resource_type) {
>> + case ACPI_AEST_CACHE_RESOURCE:
>> + memcpy(&node->proc, proc,
>> + sizeof(struct acpi_aest_processor_cache));
>> + break;
>> + case ACPI_AEST_TLB_RESOURCE:
>> + memcpy(&node->proc, proc,
>> + sizeof(struct acpi_aest_processor_tlb));
>> + break;
>> + case ACPI_AEST_GENERIC_RESOURCE:
>> + memcpy(&node->proc, proc,
>> + sizeof(struct acpi_aest_processor_generic));
>> + break;
>> + }
>> +
>> + ret = aest_init_common(hdr, node);
>> + if (ret)
>> + kfree(node);
>> +
>> + return ret;
>> +}
>> +
>> +static int __init aest_init_node(struct acpi_aest_hdr *node)
>> +{
>> + switch (node->type) {
>> + case ACPI_AEST_PROCESSOR_ERROR_NODE:
>> + return aest_init_processor_node(node);
>> + case ACPI_AEST_MEMORY_ERROR_NODE:
>> + case ACPI_AEST_VENDOR_ERROR_NODE:
>> + case ACPI_AEST_SMMU_ERROR_NODE:
>> + case ACPI_AEST_GIC_ERROR_NODE:
>> + return aest_init_node_default(node);
>> + default:
>> + return -EINVAL;
>> + }
>> +}
>> +
>> +static void __init aest_count_ppi(struct acpi_aest_hdr *header)
>> +{
>> + struct acpi_aest_node_interrupt *interrupt;
>> + int i;
>> +
>> + interrupt = ACPI_ADD_PTR(struct acpi_aest_node_interrupt, header,
>> + header->node_interrupt_offset);
>> +
>> + for (i = 0; i < header->node_interrupt_count; i++, interrupt++) {
>> + if (interrupt->gsiv >= 16 && interrupt->gsiv < 32)
>> + num_ppi++;
>> + }
>> +}
>> +
>> +static int aest_starting_cpu(unsigned int cpu)
>> +{
>> + int i;
>> +
>> + for (i = 0; i < num_ppi; i++)
>> + enable_percpu_irq(ppi_irqs[i], IRQ_TYPE_NONE);
>> +
>> + return 0;
>> +}
>> +
>> +static int aest_dying_cpu(unsigned int cpu)
>> +{
>> + int i;
>> +
>> + for (i = 0; i < num_ppi; i++)
>> + disable_percpu_irq(ppi_irqs[i]);
>> +
>> + return 0;
>> +}
>> +
>> +int __init acpi_aest_init(void)
>
> Should be 'static'.
>
>> +{
>> + struct acpi_aest_hdr *aest_node, *aest_end;
>> + struct acpi_table_aest *aest;
>> + int i, ret = 0;
>> +
>> + if (acpi_disabled)
>> + return 0;
>> +
>> + if (!IS_ENABLED(CONFIG_ARM64_RAS_EXTN))
>> + return 0;
>
> I think you can move this into Kconfig file, that makes ACPI_AEST
> dependent on this CONFIG_ARM64_RAS_EXTN?
>
>> +
>> + if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_AEST, 0, &aest_table)))
>> + return -EINVAL;
>> +
>> + ret = aest_node_pool_init();
>> + if (ret) {
>> + pr_err("Failed init aest node pool.\n");
>> + goto fail;
>
> Just return ret;
>
>> + }
>> +
>> + INIT_WORK(&aest_work, aest_node_pool_process);
>> +
>> + aest = (struct acpi_table_aest *)aest_table;
>> +
>> + /* Get the first AEST node */
>> + aest_node = ACPI_ADD_PTR(struct acpi_aest_hdr, aest,
>> + sizeof(struct acpi_table_header));
>> + /* Pointer to the end of the AEST table */
>> + aest_end = ACPI_ADD_PTR(struct acpi_aest_hdr, aest,
>> + aest_table->length);
>> +
>> + while (aest_node < aest_end) {
>> + if (((u64)aest_node + aest_node->length) > (u64)aest_end) {
>> + pr_err("AEST node pointer overflow, bad table.\n");
>> + return -EINVAL;
>
> You should destroy the node pool before returning errors.
>
>> + }
>> +
>> + aest_count_ppi(aest_node);
>> +
>> + aest_node = ACPI_ADD_PTR(struct acpi_aest_hdr, aest_node,
>> + aest_node->length);
>> + }
>> +
>> + aest_ppi_data = kcalloc(num_ppi, sizeof(struct aest_node_data *),
>> + GFP_KERNEL);
>> + if (!aest_ppi_data) {
>> + ret = -ENOMEM;
>> + goto fail;
>> + }
>> +
>> + ppi_irqs = kcalloc(num_ppi, sizeof(int), GFP_KERNEL);
>> + if (!ppi_irqs) {
>> + ret = -ENOMEM;
>> + goto fail;
>> + }
>> +
>> + for (i = 0; i < num_ppi; i++) {
>> + aest_ppi_data[i] = alloc_percpu(struct aest_node);
>> + if (!aest_ppi_data[i]) {
>> + pr_err("Failed percpu allocation.\n");
>> + ret = -ENOMEM;
>> + goto fail;
>> + }
>> + }
>> +
>> + aest_node = ACPI_ADD_PTR(struct acpi_aest_hdr, aest,
>> + sizeof(struct acpi_table_header));
>> +
>> + while (aest_node < aest_end) {
>> + ret = aest_init_node(aest_node);
>> + if (ret) {
>> + pr_err("failed to init node: %d", ret);
>> + goto fail;
>> + }
>> +
>> + aest_node = ACPI_ADD_PTR(struct acpi_aest_hdr, aest_node,
>> + aest_node->length);
>> + }
>> +
>> +
>> +
>> + return cpuhp_setup_state(CPUHP_AP_ARM_AEST_STARTING,
>> + "drivers/acpi/arm64/aest:starting",
>> + aest_starting_cpu, aest_dying_cpu);
>
> Need free the resources you requested if an error occurs.
>
>> +
>> +fail:
>> + for (i = 0; i < num_ppi; i++)
>> + free_percpu(aest_ppi_data[i]);
>> + kfree(aest_ppi_data);
>> + return ret;
>> +}
>> +subsys_initcall(acpi_aest_init);
>> diff --git a/include/linux/acpi_aest.h b/include/linux/acpi_aest.h
>> new file mode 100644
>> index 000000000000..679187505dc6
>> --- /dev/null
>> +++ b/include/linux/acpi_aest.h
>> @@ -0,0 +1,92 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +#ifndef AEST_H
>> +#define AEST_H
>> +
>> +#include <acpi/actbl.h>
>> +#include <asm/ras.h>
>> +
>> +#define AEST_INTERRUPT_MODE BIT(0)
>> +
>> +#define ACPI_AEST_PROC_FLAG_GLOBAL (1<<0)
>> +#define ACPI_AEST_PROC_FLAG_SHARED (1<<1)
>> +
>> +#define ACPI_AEST_INTERFACE_CLEAR_MISC (1<<0)
>> +
>> +#define ERXFR 0x0
>> +#define ERXCTLR 0x8
>> +#define ERXSTATUS 0x10
>> +#define ERXADDR 0x18
>> +#define ERXMISC0 0x20
>> +#define ERXMISC1 0x28
>> +#define ERXMISC2 0x30
>> +#define ERXMISC3 0x38
>> +
>> +struct aest_node_interface {
>> + u8 type;
>> + u64 phy_addr;
>> + u16 record_start;
>> + u16 record_end;
>> + u32 flags;
>> + unsigned long record_implemented;
>> + unsigned long status_reporting;
>> + unsigned long addressing_mode;
>> + struct ras_ext_regs *regs;
>> + u64 *ce_threshold;
>> +};
>> +
>> +union aest_node_processor {
>> + struct acpi_aest_processor_cache cache_data;
>> + struct acpi_aest_processor_tlb tlb_data;
>> + struct acpi_aest_processor_generic generic_data;
>> +};
>> +
>> +union aest_node_spec {
>> + struct acpi_aest_processor processor;
>> + struct acpi_aest_memory memory;
>> + struct acpi_aest_smmu smmu;
>> + struct acpi_aest_vendor vendor;
>> + struct acpi_aest_gic gic;
>> +};
>> +
>> +struct aest_access {
>> + u64 (*read)(u64 base, u32 offset);
>> + void (*write)(u64 base, u32 offset, u64 val);
>> +};
>> +
>> +struct aest_node {
>> + char *name;
>> + u8 type;
>> + struct aest_node_interface interface;
>> + union aest_node_spec spec;
>> + union aest_node_processor proc;
>> + struct aest_access *access;
>> +};
>> +
>> +struct aest_node_llist {
>> + struct llist_node llnode;
>> + char *node_name;
>> + int type;
>> + /*
>> + * Different nodes have different meanings:
>> + * - Processor node : processor number.
>> + * - Memory node : SRAT proximity domain.
>> + * - SMMU node : IORT proximity domain.
>> + * - Vendor node : hardware ID.
>> + * - GIC node : interface type.
>> + */
>> + u32 id0;
>> + /*
>> + * Different nodes have different meanings:
>> + * - Processor node : processor resource type.
>> + * - Memory node : Non.
>> + * - SMMU node : subcomponent reference.
>> + * - Vendor node : Unique ID.
>> + * - GIC node : instance identifier.
>> + */
>> + u32 id1;
>> + int index;
>> + unsigned long addressing_mode;
>> + struct ras_ext_regs *regs;
>> +};
>
> These are only aest-related structures? If so, I think they should be in
> aest.c file.
>
>> +
>> +#endif /* AEST_H */
>> diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
>> index 624d4a38c358..f0dda08dbad2 100644
>> --- a/include/linux/cpuhotplug.h
>> +++ b/include/linux/cpuhotplug.h
>> @@ -186,6 +186,7 @@ enum cpuhp_state {
>> CPUHP_AP_CSKY_TIMER_STARTING,
>> CPUHP_AP_TI_GP_TIMER_STARTING,
>> CPUHP_AP_HYPERV_TIMER_STARTING,
>> + CPUHP_AP_ARM_AEST_STARTING,
>> /* Must be the last timer callback */
>> CPUHP_AP_DUMMY_TIMER_STARTING,
>> CPUHP_AP_ARM_XEN_STARTING,
All accept, thanks for reviewing.
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