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Wed, 25 Mar 2026 16:57:39 +0000 From: To: , , , , , , , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v18 1/2] ACPI:RAS2: Add driver for the ACPI RAS2 feature table Date: Wed, 25 Mar 2026 16:57:11 +0000 Message-ID: <20260325165714.294-2-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20260325165714.294-1-shiju.jose@huawei.com> References: <20260325165714.294-1-shiju.jose@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.48.146.71] X-ClientProxiedBy: lhrpeml500010.china.huawei.com (7.191.174.240) To dubpeml500008.china.huawei.com (7.214.146.94) X-Rspamd-Queue-Id: 751CC14000E X-Stat-Signature: efzpuht7o3ad5oizm9y8tz4yiqd7qr3o X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1774457865-821535 X-HE-Meta: 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 GnQytOtY LiAFS7Bke/IL2UsWR6oPsDZb1ul8YaJg2owl7wmTmCCseUrMQtzPhuXvG93M73kXm1J9t2mvlhHFDtjD1xbQh+SuRkZZM+NltXzhsZ0xVw4Io1SSbofPAhK/euGEro5gJyns1mF8WDa58ldVwgvWszGsioE6lmvU3pZCRHQneczmzA3n/mM1WvYKpaWQEI11ptFZ7khTVxw5wunwUcNwScF+k+niw4xg8ce2HTIg0qAjjkTTBRorc0QUl0g2CXVoXLiC9zQPs7TTzUrj4uenA0MiSPB7QK2AkFpRoP6h2NHBD7lXYRf16oWdsVbymOePN0EJH8KipSm0QaZBEQMbXOgcZpQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Shiju Jose ACPI 6.5 Specification, section 5.2.21, defined RAS2 feature table (RAS2). Driver adds support for RAS2 feature table, which provides interfaces for platform RAS features, e.g., for HW-based memory scrubbing, and logical to PA translation service. RAS2 uses PCC channel subspace for communicating with the ACPI compliant HW platform. Co-developed-by: A Somasundaram Signed-off-by: A Somasundaram Co-developed-by: Jonathan Cameron Signed-off-by: Jonathan Cameron Tested-by: Daniel Ferguson Signed-off-by: Shiju Jose --- drivers/acpi/Kconfig | 11 ++ drivers/acpi/Makefile | 1 + drivers/acpi/bus.c | 3 + drivers/acpi/ras2.c | 428 ++++++++++++++++++++++++++++++++++++++++++ include/acpi/ras2.h | 57 ++++++ 5 files changed, 500 insertions(+) create mode 100644 drivers/acpi/ras2.c create mode 100644 include/acpi/ras2.h diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index df0ff0764d0d..194da13c8b31 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -293,6 +293,17 @@ config ACPI_CPPC_LIB If your platform does not support CPPC in firmware, leave this option disabled. +config ACPI_RAS2 + bool "ACPI RAS2 driver" + select AUXILIARY_BUS + depends on MAILBOX + depends on PCC + help + Add support for the RAS2 feature table and provide interfaces for + platform RAS features, such as hardware-based memory scrubbing. + + If unsure, select N. + config ACPI_PROCESSOR tristate "Processor" depends on X86 || ARM64 || LOONGARCH || RISCV diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index d1b0affb844f..abfec6745724 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -105,6 +105,7 @@ obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o obj-$(CONFIG_ACPI_BGRT) += bgrt.o obj-$(CONFIG_ACPI_CPPC_LIB) += cppc_acpi.o obj-$(CONFIG_ACPI_SPCR_TABLE) += spcr.o +obj-$(CONFIG_ACPI_RAS2) += ras2.o obj-$(CONFIG_ACPI_DEBUGGER_USER) += acpi_dbg.o obj-$(CONFIG_ACPI_PPTT) += pptt.o obj-$(CONFIG_ACPI_PFRUT) += pfr_update.o pfr_telemetry.o diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index f6707325f582..77a848f0cfc1 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -31,6 +31,7 @@ #include #include #include +#include #include "internal.h" @@ -1531,6 +1532,8 @@ static int __init acpi_init(void) acpi_debugger_init(); acpi_setup_sb_notify_handler(); acpi_viot_init(); + acpi_ras2_init(); + return 0; } diff --git a/drivers/acpi/ras2.c b/drivers/acpi/ras2.c new file mode 100644 index 000000000000..36de200f0fc1 --- /dev/null +++ b/drivers/acpi/ras2.c @@ -0,0 +1,428 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ACPI RAS2 feature table driver. + * + * Copyright (c) 2024-2026 HiSilicon Limited. + * + * Support for RAS2 table - ACPI 6.5 Specification, section 5.2.21, which + * provides interfaces for platform RAS features, e.g., for HW-based memory + * scrubbing, and logical to physical address translation service. RAS2 uses + * PCC channel subspace for communicating with the ACPI compliant HW platform. + */ + +#undef pr_fmt +#define pr_fmt(fmt) "ACPI RAS2: " fmt + +#include +#include +#include +#include +#include +#include + +/** + * struct ras2_sspcc - Data structure for PCC communication + * @mbox_client: struct mbox_client object + * @pcc_chan: Pointer to struct pcc_mbox_chan + * @comm_addr: Pointer to RAS2 PCC shared memory region + * @pcc_lock: PCC lock to provide mutually exclusive access + * to PCC channel subspace + * @deadline_us: Poll PCC status register timeout in microsecs + * for PCC command completion + * @pcc_mpar: Maximum Periodic Access Rate (MPAR) for PCC channel + * @pcc_mrtt: Minimum Request Turnaround Time (MRTT) in microsecs + * OS must wait after completion of a PCC command before + * issuing next command + * @last_cmd_cmpl_time: Completion time of last PCC command + * @last_mpar_reset: Time of last MPAR count reset + * @mpar_count: MPAR count + * @pcc_id: Identifier of the RAS2 platform communication channel + * @last_cmd: Last PCC command + * @pcc_chnl_acq: Status of PCC channel acquired + */ +struct ras2_sspcc { + struct mbox_client mbox_client; + struct pcc_mbox_chan *pcc_chan; + struct acpi_ras2_shmem __iomem *comm_addr; + struct mutex pcc_lock; + unsigned int deadline_us; + unsigned int pcc_mpar; + unsigned int pcc_mrtt; + ktime_t last_cmd_cmpl_time; + ktime_t last_mpar_reset; + int mpar_count; + int pcc_id; + u16 last_cmd; + bool pcc_chnl_acq; +}; + +/* + * Arbitrary retries for PCC commands because the remote processor could be + * much slower to reply. Keep it high enough to cover emulators where the + * processors run painfully slow. + */ +#define PCC_NUM_RETRIES 600ULL +#define PCC_MIN_POLL_USECS 3 + +#define RAS2_MAX_NUM_PCC_DESCS 100 +#define RAS2_FEAT_TYPE_MEMORY 0x00 + +static int check_pcc_chan(struct ras2_sspcc *sspcc) +{ + struct acpi_ras2_shmem __iomem *gen_comm_base = sspcc->comm_addr; + u32 cap_status; + u16 status; + int rc; + + /* + * As per ACPI spec, the PCC space will be initialized by the + * platform and should have set the command completion bit when + * PCC can be used by OSPM. + * + * Poll PCC status register every PCC_MIN_POLL_USECS for maximum of + * PCC_NUM_RETRIES * PCC channel latency until PCC command complete + * bit is set. + */ + rc = readw_relaxed_poll_timeout(&gen_comm_base->status, status, + status & PCC_STATUS_CMD_COMPLETE, + PCC_MIN_POLL_USECS, sspcc->deadline_us); + if (rc) { + pr_warn("PCC ID: 0x%x: PCC check channel timeout for last command: 0x%x rc=%d\n", + sspcc->pcc_id, sspcc->last_cmd, rc); + + return rc; + } + + if (status & PCC_STATUS_ERROR) { + pr_warn("PCC ID: 0x%x: Error in executing last command: 0x%x\n", + sspcc->pcc_id, sspcc->last_cmd); + status &= ~PCC_STATUS_ERROR; + writew_relaxed(status, &gen_comm_base->status); + return -EIO; + } + + cap_status = readl_relaxed(&gen_comm_base->set_caps_status); + switch (cap_status) { + case ACPI_RAS2_NOT_VALID: + case ACPI_RAS2_NOT_SUPPORTED: + rc = -EPERM; + break; + case ACPI_RAS2_BUSY: + rc = -EBUSY; + break; + case ACPI_RAS2_FAILED: + case ACPI_RAS2_ABORTED: + case ACPI_RAS2_INVALID_DATA: + rc = -EINVAL; + break; + default: + rc = 0; + } + + writew_relaxed(0x0, &gen_comm_base->set_caps_status); + + return rc; +} + +/** + * ras2_send_pcc_cmd() - Send RAS2 command via PCC channel + * @ras2_ctx: pointer to the RAS2 context structure + * @cmd: RAS2 command to send + * + * Returns: 0 on success, an error otherwise + */ +int ras2_send_pcc_cmd(struct ras2_mem_ctx *ras2_ctx, u16 cmd) +{ + struct acpi_ras2_shmem __iomem *gen_comm_base; + struct mbox_chan *pcc_channel; + struct ras2_sspcc *sspcc; + unsigned int time_delta; + int rc; + + if (!ras2_ctx) + return -EINVAL; + + sspcc = ras2_ctx->sspcc; + gen_comm_base = sspcc->comm_addr; + + rc = check_pcc_chan(sspcc); + if (rc < 0) + return rc; + + pcc_channel = sspcc->pcc_chan->mchan; + + /* + * Handle the Minimum Request Turnaround Time (MRTT): the minimum + * amount of time that OSPM must wait after the completion of + * a command before issuing the next command, in microseconds. + */ + if (sspcc->pcc_mrtt) { + time_delta = ktime_us_delta(ktime_get(), sspcc->last_cmd_cmpl_time); + if (sspcc->pcc_mrtt > time_delta) + udelay(sspcc->pcc_mrtt - time_delta); + } + + /* + * Handle the non-zero Maximum Periodic Access Rate (MPAR): the + * maximum number of periodic requests that the subspace channel can + * support, reported in commands per minute. 0 indicates no + * limitation. + * + * This parameter should be ideally zero or large enough so that it + * can handle maximum number of requests that all the cores in the + * system can collectively generate. If it is not, follow the spec and + * just not send the request to the platform after hitting the MPAR + * limit in any 60s window. + */ + if (sspcc->pcc_mpar) { + if (!sspcc->mpar_count) { + time_delta = ktime_ms_delta(ktime_get(), sspcc->last_mpar_reset); + if (time_delta < 60 * MSEC_PER_SEC) { + dev_dbg(ras2_ctx->dev, + "PCC command 0x%x not sent due to MPAR limit", cmd); + return -EIO; + } + sspcc->last_mpar_reset = ktime_get(); + sspcc->mpar_count = sspcc->pcc_mpar; + } + sspcc->mpar_count--; + } + + /* Write to the shared comm region */ + writew_relaxed(cmd, &gen_comm_base->command); + + /* Flip CMD COMPLETE bit */ + writew_relaxed(0, &gen_comm_base->status); + + /* Ring doorbell */ + rc = mbox_send_message(pcc_channel, &cmd); + /* + * mbox_send_message() returns a non-negative integer for successful submission + * and a negative value on failure. + */ + if (rc < 0) { + dev_warn(ras2_ctx->dev, + "Error sending PCC mbox message command: 0x%x, rc:%d\n", cmd, rc); + return rc; + } else { + rc = 0; + } + + sspcc->last_cmd = cmd; + + /* + * If Minimum Request Turnaround Time is non-zero, need to record the + * completion time of both READ and WRITE commands for proper handling + * of MRTT, so need to check for pcc_mrtt in addition to PCC_CMD_EXEC_RAS2. + */ + if (cmd == PCC_CMD_EXEC_RAS2 || sspcc->pcc_mrtt) { + rc = check_pcc_chan(sspcc); + if (sspcc->pcc_mrtt) + sspcc->last_cmd_cmpl_time = ktime_get(); + } + + /* + * Both mbox_chan_txdone() and mbox_client_txdone() require the status + * of the last transmission as the second argument. + */ + if (pcc_channel->mbox->txdone_irq) + mbox_chan_txdone(pcc_channel, rc); + else + mbox_client_txdone(pcc_channel, rc); + + return rc; +} +EXPORT_SYMBOL_FOR_MODULES(ras2_send_pcc_cmd, "acpi_ras2"); + +static int register_pcc_channel(struct ras2_mem_ctx *ras2_ctx, int pcc_id) +{ + struct pcc_mbox_chan *pcc_chan; + struct ras2_sspcc *sspcc; + + if (pcc_id < 0) + return -EINVAL; + + sspcc = kzalloc(sizeof(*sspcc), GFP_KERNEL); + if (!sspcc) + return -ENOMEM; + + pcc_chan = pcc_mbox_request_channel(&sspcc->mbox_client, pcc_id); + if (IS_ERR(pcc_chan)) { + kfree(sspcc); + return PTR_ERR(pcc_chan); + } + + sspcc->pcc_id = pcc_id; + sspcc->pcc_chan = pcc_chan; + sspcc->comm_addr = pcc_chan->shmem; + sspcc->deadline_us = PCC_NUM_RETRIES * pcc_chan->latency; + sspcc->pcc_mrtt = pcc_chan->min_turnaround_time; + sspcc->pcc_mpar = pcc_chan->max_access_rate; + sspcc->mbox_client.knows_txdone = true; + + ras2_ctx->sspcc = sspcc; + ras2_ctx->comm_addr = sspcc->comm_addr; + ras2_ctx->dev = pcc_chan->mchan->mbox->dev; + + mutex_init(&sspcc->pcc_lock); + ras2_ctx->pcc_lock = &sspcc->pcc_lock; + + return 0; +} + +static DEFINE_IDA(ras2_ida); +static void ras2_release(struct device *device) +{ + struct auxiliary_device *auxdev = to_auxiliary_dev(device); + struct ras2_mem_ctx *ras2_ctx = container_of(auxdev, struct ras2_mem_ctx, adev); + struct ras2_sspcc *sspcc; + + ida_free(&ras2_ida, auxdev->id); + sspcc = ras2_ctx->sspcc; + pcc_mbox_free_channel(sspcc->pcc_chan); + kfree(sspcc); + kfree(ras2_ctx); +} + +static struct ras2_mem_ctx *add_aux_device(char *name, int channel, u32 pxm_inst) +{ + struct ras2_mem_ctx *ras2_ctx; + struct ras2_sspcc *sspcc; + u32 comp_nid; + int id, rc; + + comp_nid = pxm_to_node(pxm_inst); + if (comp_nid == NUMA_NO_NODE) { + pr_debug("Invalid NUMA node, channel=%d pxm_inst=%d\n", channel, pxm_inst); + return ERR_PTR(-EINVAL); + } + + ras2_ctx = kzalloc(sizeof(*ras2_ctx), GFP_KERNEL); + if (!ras2_ctx) + return ERR_PTR(-ENOMEM); + + ras2_ctx->sys_comp_nid = comp_nid; + + rc = register_pcc_channel(ras2_ctx, channel); + if (rc < 0) { + pr_debug("Failed to register PCC channel=%d pxm_inst=%d rc=%d\n", channel, + pxm_inst, rc); + goto ctx_free; + } + + id = ida_alloc(&ras2_ida, GFP_KERNEL); + if (id < 0) { + rc = id; + goto pcc_free; + } + + ras2_ctx->adev.id = id; + ras2_ctx->adev.name = name; + ras2_ctx->adev.dev.release = ras2_release; + ras2_ctx->adev.dev.parent = ras2_ctx->dev; + + rc = auxiliary_device_init(&ras2_ctx->adev); + if (rc) + goto ida_free; + + rc = auxiliary_device_add(&ras2_ctx->adev); + if (rc) { + auxiliary_device_uninit(&ras2_ctx->adev); + goto ida_free; + } + + return ras2_ctx; + +ida_free: + ida_free(&ras2_ida, id); +pcc_free: + sspcc = ras2_ctx->sspcc; + pcc_mbox_free_channel(sspcc->pcc_chan); + kfree(sspcc); +ctx_free: + kfree(ras2_ctx); + + return ERR_PTR(rc); +} + +static void remove_aux_device(struct ras2_mem_ctx *ras2_ctx) +{ + if (!ras2_ctx) + return; + + auxiliary_device_delete(&ras2_ctx->adev); + auxiliary_device_uninit(&ras2_ctx->adev); +} + +static int parse_ras2_table(struct acpi_table_ras2 *ras2_tab) +{ + struct acpi_ras2_pcc_desc *pcc_desc_list; + struct ras2_mem_ctx **pctx_list; + struct ras2_mem_ctx *ras2_ctx; + u16 i; + + if (ras2_tab->header.length < sizeof(*ras2_tab)) { + pr_warn(FW_WARN "ACPI RAS2 table present but broken (too short, size=%u)\n", + ras2_tab->header.length); + return -EINVAL; + } + + if (!ras2_tab->num_pcc_descs || ras2_tab->num_pcc_descs > RAS2_MAX_NUM_PCC_DESCS) { + pr_warn(FW_WARN "No/Invalid number of PCC descs(%d) in ACPI RAS2 table\n", + ras2_tab->num_pcc_descs); + return -EINVAL; + } + + pctx_list = kcalloc(ras2_tab->num_pcc_descs, sizeof(*pctx_list), GFP_KERNEL); + if (!pctx_list) + return -ENOMEM; + + pcc_desc_list = (struct acpi_ras2_pcc_desc *)(ras2_tab + 1); + for (i = 0; i < ras2_tab->num_pcc_descs; i++, pcc_desc_list++) { + if (pcc_desc_list->feature_type != RAS2_FEAT_TYPE_MEMORY) + continue; + + ras2_ctx = add_aux_device(RAS2_MEM_DEV_ID_NAME, pcc_desc_list->channel_id, + pcc_desc_list->instance); + if (IS_ERR(ras2_ctx)) { + pr_warn("Failed to add RAS2 auxiliary device rc=%ld\n", PTR_ERR(ras2_ctx)); + for (; i > 0; i--) { + if (pctx_list[i - 1]) + remove_aux_device(pctx_list[i - 1]); + } + kfree(pctx_list); + return PTR_ERR(ras2_ctx); + } + pctx_list[i] = ras2_ctx; + } + kfree(pctx_list); + + return 0; +} + +/** + * acpi_ras2_init - RAS2 driver initialization function. + * + * Extracts the ACPI RAS2 table and retrieves ID for the PCC channel subspace + * for communicating with the ACPI compliant HW platform. Driver adds an + * auxiliary device, which binds to the memory ACPI RAS2 driver, for each RAS2 + * memory feature. + * + * Returns: none. + */ +void __init acpi_ras2_init(void) +{ + struct acpi_table_ras2 *ras2_tab; + acpi_status status; + + status = acpi_get_table(ACPI_SIG_RAS2, 0, (struct acpi_table_header **)&ras2_tab); + if (ACPI_FAILURE(status)) { + pr_debug("Failed to get table, %s\n", acpi_format_exception(status)); + return; + } + + if (parse_ras2_table(ras2_tab)) + pr_debug("Failed to parse RAS2 table\n"); + + acpi_put_table((struct acpi_table_header *)ras2_tab); +} diff --git a/include/acpi/ras2.h b/include/acpi/ras2.h new file mode 100644 index 000000000000..f4574e8e0a12 --- /dev/null +++ b/include/acpi/ras2.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * ACPI RAS2 (RAS Feature Table) methods. + * + * Copyright (c) 2024-2026 HiSilicon Limited + */ + +#ifndef _ACPI_RAS2_H +#define _ACPI_RAS2_H + +#include +#include +#include +#include +#include + +struct device; + +/* + * ACPI spec 6.5 Table 5.82: PCC command codes used by + * RAS2 platform communication channel. + */ +#define PCC_CMD_EXEC_RAS2 0x01 + +#define RAS2_AUX_DEV_NAME "ras2" +#define RAS2_MEM_DEV_ID_NAME "acpi_ras2_mem" + +/** + * struct ras2_mem_ctx - Context for RAS2 memory features + * @adev: Auxiliary device object + * @comm_addr: Pointer to RAS2 PCC shared memory region + * @dev: Pointer to device backing struct mbox_controller for PCC + * @sspcc: Pointer to local data structure for PCC communication + * @pcc_lock: Pointer to PCC lock to provide mutually exclusive access + * to PCC channel subspace + * @sys_comp_nid: Node ID of the system component that the RAS feature + * is associated with. See ACPI spec 6.5 Table 5.80: RAS2 + * Platform Communication Channel Descriptor format, + * Field: Instance + */ +struct ras2_mem_ctx { + struct auxiliary_device adev; + struct acpi_ras2_shmem __iomem *comm_addr; + struct device *dev; + void *sspcc; + struct mutex *pcc_lock; + u32 sys_comp_nid; +}; + +#ifdef CONFIG_ACPI_RAS2 +void __init acpi_ras2_init(void); +int ras2_send_pcc_cmd(struct ras2_mem_ctx *ras2_ctx, u16 cmd); +#else +static inline void acpi_ras2_init(void) { } +#endif + +#endif /* _ACPI_RAS2_H */ -- 2.43.0