From patchwork Mon Jan 23 15:22:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeremi Piotrowski X-Patchwork-Id: 645588 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 856BAC54E94 for ; Mon, 23 Jan 2023 15:24:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232663AbjAWPY2 (ORCPT ); Mon, 23 Jan 2023 10:24:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232694AbjAWPYM (ORCPT ); Mon, 23 Jan 2023 10:24:12 -0500 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id AF51E1449F; Mon, 23 Jan 2023 07:23:40 -0800 (PST) Received: from vm02.corp.microsoft.com (unknown [167.220.196.155]) by linux.microsoft.com (Postfix) with ESMTPSA id ADE7720E2D0F; Mon, 23 Jan 2023 07:23:19 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com ADE7720E2D0F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1674487401; bh=9zBj7lGZiNLssSN0Bow0NnJuBiAOG3TjbvKNnsD+cgs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=piUgfKTMtNgh91hbplX9eKpXd+cuU/rha676DInDJuLERkQLHA2nONmmv2OsnQVjp hSQBjrl0UAZPYIEpKncMTGUCcN6sqxXLu/n3hokF9Qt4rQ0XGuB0EibnNmjjuxQZjn zR6e6P54nIBapIr6mh5IysSrEzuQrfi7iY3Yr+48= From: Jeremi Piotrowski To: linux-kernel@vger.kernel.org Cc: Jeremi Piotrowski , "Brijesh Singh" , "Tom Lendacky" , "Kalra, Ashish" , linux-crypto@vger.kernel.org, "Rafael J. Wysocki" , "Len Brown" , linux-acpi@vger.kernel.org Subject: [PATCH v1 2/8] ACPI: ASPT: Add helper to parse table Date: Mon, 23 Jan 2023 15:22:44 +0000 Message-Id: <20230123152250.26413-3-jpiotrowski@linux.microsoft.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230123152250.26413-1-jpiotrowski@linux.microsoft.com> References: <20230123152250.26413-1-jpiotrowski@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org The ASP table indicates the presence of a Platform Security Processor with a register window and registers to configure interrupt delivery. The helper checks for the presence of the table and returns a resource and struct with register offsets. Signed-off-by: Jeremi Piotrowski --- drivers/acpi/Makefile | 1 + drivers/acpi/aspt.c | 104 ++++++++++++++++++++++++++++++ include/linux/platform_data/psp.h | 32 +++++++++ 3 files changed, 137 insertions(+) create mode 100644 drivers/acpi/aspt.c create mode 100644 include/linux/platform_data/psp.h diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 0002eecbf870..9621c90e0221 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -57,6 +57,7 @@ acpi-y += evged.o acpi-y += sysfs.o acpi-y += property.o acpi-$(CONFIG_X86) += acpi_cmos_rtc.o +acpi-$(CONFIG_X86) += aspt.o acpi-$(CONFIG_X86) += x86/apple.o acpi-$(CONFIG_X86) += x86/utils.o acpi-$(CONFIG_X86) += x86/s2idle.o diff --git a/drivers/acpi/aspt.c b/drivers/acpi/aspt.c new file mode 100644 index 000000000000..cf629db35036 --- /dev/null +++ b/drivers/acpi/aspt.c @@ -0,0 +1,104 @@ +// SPDX-License-Identifier: GPL-2.0-only +#define pr_fmt(fmt) "ACPI: ASPT: " fmt +#include +#include +#include + +static int __init psp_validate_regs(const struct acpi_aspt_global_regs *gregs, + const struct acpi_aspt_sev_mbox_regs *sevregs, + const struct acpi_aspt_acpi_mbox_regs *acpiregs) +{ + u64 pfn; + int idx; + u64 regs[] = { + gregs->feature_reg_addr, + gregs->irq_en_reg_addr, + gregs->irq_st_reg_addr, + sevregs->cmd_resp_reg_addr, + sevregs->cmd_buf_lo_reg_addr, + sevregs->cmd_buf_hi_reg_addr, + acpiregs->cmd_resp_reg_addr + }; + pfn = regs[0] >> PAGE_SHIFT; + for (idx = 1; idx < ARRAY_SIZE(regs); idx++) { + if (regs[idx] >> PAGE_SHIFT != pfn) + return -EINVAL; + } + return 0; +} + +/** + * acpi_parse_aspt - Parse ASPT table and return contained information + * @res: will be filled with the address and size of the ASP register window + * @pdata: will be filled with the register offsets parsed from the ASPT table + */ +int __init acpi_parse_aspt(struct resource *res, struct psp_platform_data *pdata) +{ + struct acpi_aspt_acpi_mbox_regs acpiregs = {}; + struct acpi_aspt_sev_mbox_regs sevregs = {}; + struct acpi_aspt_global_regs gregs = {}; + struct acpi_aspt_header *entry, *end; + struct acpi_table_aspt *aspt; + unsigned long base; + acpi_status status; + int err = 0; + + status = acpi_get_table(ACPI_SIG_ASPT, 0, (struct acpi_table_header **)&aspt); + if (ACPI_FAILURE(status)) + return -ENODEV; + if (aspt->header.revision != ASPT_REVISION_ID) { + pr_err("unsupported table revision: %d\n", (int)aspt->header.revision); + err = -ENODEV; + goto exit; + } + entry = (struct acpi_aspt_header *)(aspt + 1); + end = (struct acpi_aspt_header *)((void *)aspt + aspt->header.length); + while (entry < end) { + if (((void *)entry + entry->length) > (void *)end) { + pr_err("error during parsing\n"); + err = -EINVAL; + goto exit; + } + switch (entry->type) { + case ACPI_ASPT_TYPE_GLOBAL_REGS: + memcpy(&gregs, entry, entry->length); + break; + case ACPI_ASPT_TYPE_SEV_MBOX_REGS: + memcpy(&sevregs, entry, entry->length); + break; + case ACPI_ASPT_TYPE_ACPI_MBOX_REGS: + memcpy(&acpiregs, entry, entry->length); + break; + } + entry = (struct acpi_aspt_header *)((void *)entry + entry->length); + } + if (!gregs.header.length || !sevregs.header.length || !acpiregs.header.length) { + pr_err("missing ASPT table entry: %u %u %u\n", gregs.header.length, + sevregs.header.length, + acpiregs.header.length); + err = -EINVAL; + goto exit; + } + /* All registers are expected to be within the same page */ + err = psp_validate_regs(&gregs, &sevregs, &acpiregs); + if (err) { + pr_err("ASPT registers span multiple pages\n"); + goto exit; + } + + base = ALIGN_DOWN(gregs.feature_reg_addr, PAGE_SIZE); + *res = (struct resource)DEFINE_RES_MEM(base, PAGE_SIZE); + + pdata->sev_cmd_resp_reg = sevregs.cmd_resp_reg_addr & ~PAGE_MASK; + pdata->sev_cmd_buf_lo_reg = sevregs.cmd_buf_lo_reg_addr & ~PAGE_MASK; + pdata->sev_cmd_buf_hi_reg = sevregs.cmd_buf_hi_reg_addr & ~PAGE_MASK; + pdata->feature_reg = gregs.feature_reg_addr & ~PAGE_MASK; + pdata->irq_en_reg = gregs.irq_en_reg_addr & ~PAGE_MASK; + pdata->irq_st_reg = gregs.irq_st_reg_addr & ~PAGE_MASK; + pdata->mbox_irq_id = sevregs.mbox_irq_id; + pdata->acpi_cmd_resp_reg = acpiregs.cmd_resp_reg_addr & ~PAGE_MASK; + +exit: + acpi_put_table((struct acpi_table_header *)aspt); + return err; +} diff --git a/include/linux/platform_data/psp.h b/include/linux/platform_data/psp.h new file mode 100644 index 000000000000..b761f72168d6 --- /dev/null +++ b/include/linux/platform_data/psp.h @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * psp.h - PSP register offsets parsed from ASPT ACPI table + */ + +#ifndef __LINUX_PSP_H +#define __LINUX_PSP_H + +#include +#include + +struct psp_platform_data { + int sev_cmd_resp_reg; + int sev_cmd_buf_lo_reg; + int sev_cmd_buf_hi_reg; + int feature_reg; + int irq_en_reg; + int irq_st_reg; + int mbox_irq_id; + int acpi_cmd_resp_reg; +}; + +#if IS_ENABLED(CONFIG_ACPI) +int acpi_parse_aspt(struct resource *res, struct psp_platform_data *pdata); +#else +static inline acpi_parse_aspt(struct resource *res, struct psp_platform_data *pdata) +{ + return -ENODEV; +} +#endif + +#endif /* __LINUX_PSP_H */