From patchwork Fri May 7 22:51:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12245305 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D1B90C433B4 for ; Fri, 7 May 2021 22:51:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A431561003 for ; Fri, 7 May 2021 22:51:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229470AbhEGWwX (ORCPT ); Fri, 7 May 2021 18:52:23 -0400 Received: from mga01.intel.com ([192.55.52.88]:53390 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229941AbhEGWwW (ORCPT ); Fri, 7 May 2021 18:52:22 -0400 IronPort-SDR: qNLVaLVlttopBgETD7DnjjHSr483/Rj+POzKPFsl+CaMXEJoOBp3vHPyaZApdvb8v87GrgwpJx FbkMBZAL/JGw== X-IronPort-AV: E=McAfee;i="6200,9189,9977"; a="219737067" X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="219737067" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 15:51:20 -0700 IronPort-SDR: JANy3OZ+bTPek4TLH817JhAIeuVuF/0wI0LoKo1h42VjdkBWpJurTr1fufeASi0DAEb6AGejqH 7mtThInB2Vzg== X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="435117372" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.25]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 15:51:20 -0700 Subject: [PATCH 1/8] cxl/mem: Move some definitions to mem.h From: Dan Williams To: linux-cxl@vger.kernel.org Cc: Ben Widawsky , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Date: Fri, 07 May 2021 15:51:20 -0700 Message-ID: <162042788015.1202325.6094533661799093199.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> References: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org In preparation for sharing cxl.h with other generic CXL consumers, move / consolidate some of the memory device specifics to mem.h. The motivation for moving out of cxl.h is to maintain least privilege access to memory-device details since cxl.h is used in multiple files. The motivation for moving definitions into a new mem.h header is for code readability and organization. I.e. minimize implementation details when reading data structures and other definitions. Reviewed-by: Ben Widawsky Signed-off-by: Dan Williams Reviewed-by: Jonathan Cameron --- drivers/cxl/cxl.h | 57 ------------------------------------ drivers/cxl/mem.c | 25 +--------------- drivers/cxl/mem.h | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 86 insertions(+), 81 deletions(-) create mode 100644 drivers/cxl/mem.h diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 6f14838c2d25..2e3bdacb32e7 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -34,62 +34,5 @@ #define CXLDEV_MBOX_BG_CMD_STATUS_OFFSET 0x18 #define CXLDEV_MBOX_PAYLOAD_OFFSET 0x20 -/* CXL 2.0 8.2.8.5.1.1 Memory Device Status Register */ -#define CXLMDEV_STATUS_OFFSET 0x0 -#define CXLMDEV_DEV_FATAL BIT(0) -#define CXLMDEV_FW_HALT BIT(1) -#define CXLMDEV_STATUS_MEDIA_STATUS_MASK GENMASK(3, 2) -#define CXLMDEV_MS_NOT_READY 0 -#define CXLMDEV_MS_READY 1 -#define CXLMDEV_MS_ERROR 2 -#define CXLMDEV_MS_DISABLED 3 -#define CXLMDEV_READY(status) \ - (FIELD_GET(CXLMDEV_STATUS_MEDIA_STATUS_MASK, status) == \ - CXLMDEV_MS_READY) -#define CXLMDEV_MBOX_IF_READY BIT(4) -#define CXLMDEV_RESET_NEEDED_MASK GENMASK(7, 5) -#define CXLMDEV_RESET_NEEDED_NOT 0 -#define CXLMDEV_RESET_NEEDED_COLD 1 -#define CXLMDEV_RESET_NEEDED_WARM 2 -#define CXLMDEV_RESET_NEEDED_HOT 3 -#define CXLMDEV_RESET_NEEDED_CXL 4 -#define CXLMDEV_RESET_NEEDED(status) \ - (FIELD_GET(CXLMDEV_RESET_NEEDED_MASK, status) != \ - CXLMDEV_RESET_NEEDED_NOT) - -struct cxl_memdev; -/** - * struct cxl_mem - A CXL memory device - * @pdev: The PCI device associated with this CXL device. - * @regs: IO mappings to the device's MMIO - * @status_regs: CXL 2.0 8.2.8.3 Device Status Registers - * @mbox_regs: CXL 2.0 8.2.8.4 Mailbox Registers - * @memdev_regs: CXL 2.0 8.2.8.5 Memory Device Registers - * @payload_size: Size of space for payload - * (CXL 2.0 8.2.8.4.3 Mailbox Capabilities Register) - * @mbox_mutex: Mutex to synchronize mailbox access. - * @firmware_version: Firmware version for the memory device. - * @enabled_commands: Hardware commands found enabled in CEL. - * @pmem_range: Persistent memory capacity information. - * @ram_range: Volatile memory capacity information. - */ -struct cxl_mem { - struct pci_dev *pdev; - void __iomem *regs; - struct cxl_memdev *cxlmd; - - void __iomem *status_regs; - void __iomem *mbox_regs; - void __iomem *memdev_regs; - - size_t payload_size; - struct mutex mbox_mutex; /* Protects device mailbox and firmware */ - char firmware_version[0x10]; - unsigned long *enabled_cmds; - - struct range pmem_range; - struct range ram_range; -}; - extern struct bus_type cxl_bus_type; #endif /* __CXL_H__ */ diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index 244cb7d89678..45871ef65152 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -12,6 +12,7 @@ #include #include "pci.h" #include "cxl.h" +#include "mem.h" /** * DOC: cxl mem @@ -29,12 +30,6 @@ * - Handle and manage error conditions. */ -/* - * An entire PCI topology full of devices should be enough for any - * config - */ -#define CXL_MEM_MAX_DEVS 65536 - #define cxl_doorbell_busy(cxlm) \ (readl((cxlm)->mbox_regs + CXLDEV_MBOX_CTRL_OFFSET) & \ CXLDEV_MBOX_CTRL_DOORBELL) @@ -91,24 +86,6 @@ struct mbox_cmd { #define CXL_MBOX_SUCCESS 0 }; -/** - * struct cxl_memdev - CXL bus object representing a Type-3 Memory Device - * @dev: driver core device object - * @cdev: char dev core object for ioctl operations - * @cxlm: pointer to the parent device driver data - * @ops_active: active user of @cxlm in ops handlers - * @ops_dead: completion when all @cxlm ops users have exited - * @id: id number of this memdev instance. - */ -struct cxl_memdev { - struct device dev; - struct cdev cdev; - struct cxl_mem *cxlm; - struct percpu_ref ops_active; - struct completion ops_dead; - int id; -}; - static int cxl_mem_major; static DEFINE_IDA(cxl_memdev_ida); static struct dentry *cxl_debugfs; diff --git a/drivers/cxl/mem.h b/drivers/cxl/mem.h new file mode 100644 index 000000000000..616bb6fd721f --- /dev/null +++ b/drivers/cxl/mem.h @@ -0,0 +1,85 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright(c) 2020-2021 Intel Corporation. */ +#ifndef __CXL_MEM_H__ +#define __CXL_MEM_H__ + +/* CXL 2.0 8.2.8.5.1.1 Memory Device Status Register */ +#define CXLMDEV_STATUS_OFFSET 0x0 +#define CXLMDEV_DEV_FATAL BIT(0) +#define CXLMDEV_FW_HALT BIT(1) +#define CXLMDEV_STATUS_MEDIA_STATUS_MASK GENMASK(3, 2) +#define CXLMDEV_MS_NOT_READY 0 +#define CXLMDEV_MS_READY 1 +#define CXLMDEV_MS_ERROR 2 +#define CXLMDEV_MS_DISABLED 3 +#define CXLMDEV_READY(status) \ + (FIELD_GET(CXLMDEV_STATUS_MEDIA_STATUS_MASK, status) == \ + CXLMDEV_MS_READY) +#define CXLMDEV_MBOX_IF_READY BIT(4) +#define CXLMDEV_RESET_NEEDED_MASK GENMASK(7, 5) +#define CXLMDEV_RESET_NEEDED_NOT 0 +#define CXLMDEV_RESET_NEEDED_COLD 1 +#define CXLMDEV_RESET_NEEDED_WARM 2 +#define CXLMDEV_RESET_NEEDED_HOT 3 +#define CXLMDEV_RESET_NEEDED_CXL 4 +#define CXLMDEV_RESET_NEEDED(status) \ + (FIELD_GET(CXLMDEV_RESET_NEEDED_MASK, status) != \ + CXLMDEV_RESET_NEEDED_NOT) + +/* + * An entire PCI topology full of devices should be enough for any + * config + */ +#define CXL_MEM_MAX_DEVS 65536 + +/** + * struct cxl_memdev - CXL bus object representing a Type-3 Memory Device + * @dev: driver core device object + * @cdev: char dev core object for ioctl operations + * @cxlm: pointer to the parent device driver data + * @ops_active: active user of @cxlm in ops handlers + * @ops_dead: completion when all @cxlm ops users have exited + * @id: id number of this memdev instance. + */ +struct cxl_memdev { + struct device dev; + struct cdev cdev; + struct cxl_mem *cxlm; + struct percpu_ref ops_active; + struct completion ops_dead; + int id; +}; + +/** + * struct cxl_mem - A CXL memory device + * @pdev: The PCI device associated with this CXL device. + * @regs: IO mappings to the device's MMIO + * @status_regs: CXL 2.0 8.2.8.3 Device Status Registers + * @mbox_regs: CXL 2.0 8.2.8.4 Mailbox Registers + * @memdev_regs: CXL 2.0 8.2.8.5 Memory Device Registers + * @payload_size: Size of space for payload + * (CXL 2.0 8.2.8.4.3 Mailbox Capabilities Register) + * @mbox_mutex: Mutex to synchronize mailbox access. + * @firmware_version: Firmware version for the memory device. + * @enabled_cmds: Hardware commands found enabled in CEL. + * @pmem_range: Persistent memory capacity information. + * @ram_range: Volatile memory capacity information. + */ +struct cxl_mem { + struct pci_dev *pdev; + void __iomem *regs; + struct cxl_memdev *cxlmd; + + void __iomem *status_regs; + void __iomem *mbox_regs; + void __iomem *memdev_regs; + + size_t payload_size; + struct mutex mbox_mutex; /* Protects device mailbox and firmware */ + char firmware_version[0x10]; + unsigned long *enabled_cmds; + + struct range pmem_range; + struct range ram_range; +}; +#endif /* __CXL_MEM_H__ */ From patchwork Fri May 7 22:51:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12245307 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C9745C43460 for ; Fri, 7 May 2021 22:51:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9AA9961431 for ; 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07 May 2021 15:51:25 -0700 Subject: [PATCH 2/8] cxl/mem: Introduce 'struct cxl_regs' for "composable" CXL devices From: Dan Williams To: linux-cxl@vger.kernel.org Cc: Ben Widawsky , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Date: Fri, 07 May 2021 15:51:25 -0700 Message-ID: <162042788555.1202325.7566057227479911213.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> References: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org CXL MMIO register blocks are organized by device type and capabilities. There are Component registers, Device registers (yes, an ambiguous name), and Memory Device registers (a specific extension of Device registers). It is possible for a given device instance (endpoint or port) to implement register sets from multiple of the above categories. The driver code that enumerates and maps the registers is type specific so it is useful to have a dedicated type and helpers for each block type. At the same time, once the registers are mapped the origin type does not matter. It is overly pedantic to reference the register block type in code that is using the registers. In preparation for the endpoint driver to incorporate Component registers into its MMIO operations reorganize the registers to allow typed enumeration + mapping, but anonymous usage. With the end state of 'struct cxl_regs' to be: struct cxl_regs { union { struct { CXL_DEVICE_REGS(); }; struct cxl_device_regs device_regs; }; union { struct { CXL_COMPONENT_REGS(); }; struct cxl_component_regs component_regs; }; }; With this arrangement the driver can share component init code with ports, but when using the registers it can directly reference the component register block type by name without the 'component_regs' prefix. So, map + enumerate can be shared across drivers of different CXL classes e.g.: void cxl_setup_device_regs(struct device *dev, void __iomem *base, struct cxl_device_regs *regs); void cxl_setup_component_regs(struct device *dev, void __iomem *base, struct cxl_component_regs *regs); ...while inline usage in the driver need not indicate where the registers came from: readl(cxlm->regs.mbox + MBOX_OFFSET); readl(cxlm->regs.hdm + HDM_OFFSET); ...instead of: readl(cxlm->regs.device_regs.mbox + MBOX_OFFSET); readl(cxlm->regs.component_regs.hdm + HDM_OFFSET); This complexity of the definition in .h yields improvement in code readability in .c while maintaining type-safety for organization of setup code. It prepares the implementation to maintain organization in the face of CXL devices that compose register interfaces consisting of multiple types. Given that this new container is named 'regs' rename the common register base pointer @base, and fixup the kernel-doc for the missing @cxlmd description. Reviewed-by: Ben Widawsky Signed-off-by: Dan Williams Reviewed-by: Jonathan Cameron --- drivers/cxl/cxl.h | 32 ++++++++++++++++++++++++++++++++ drivers/cxl/mem.c | 44 ++++++++++++++++++++++++-------------------- drivers/cxl/mem.h | 13 +++++-------- 3 files changed, 61 insertions(+), 28 deletions(-) diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 2e3bdacb32e7..1f3434f89ef2 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -34,5 +34,37 @@ #define CXLDEV_MBOX_BG_CMD_STATUS_OFFSET 0x18 #define CXLDEV_MBOX_PAYLOAD_OFFSET 0x20 +/* + * CXL_DEVICE_REGS - Common set of CXL Device register block base pointers + * @status: CXL 2.0 8.2.8.3 Device Status Registers + * @mbox: CXL 2.0 8.2.8.4 Mailbox Registers + * @memdev: CXL 2.0 8.2.8.5 Memory Device Registers + */ +#define CXL_DEVICE_REGS() \ + void __iomem *status; \ + void __iomem *mbox; \ + void __iomem *memdev + +/* See note for 'struct cxl_regs' for the rationale of this organization */ +struct cxl_device_regs { + CXL_DEVICE_REGS(); +}; + +/* + * Note, the anonymous union organization allows for per + * register-block-type helper routines, without requiring block-type + * agnostic code to include the prefix. I.e. + * cxl_setup_device_regs(&cxlm->regs.dev) vs readl(cxlm->regs.mbox). + * The specificity reads naturally from left-to-right. + */ +struct cxl_regs { + union { + struct { + CXL_DEVICE_REGS(); + }; + struct cxl_device_regs device_regs; + }; +}; + extern struct bus_type cxl_bus_type; #endif /* __CXL_H__ */ diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index 45871ef65152..6951243d128e 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -31,7 +31,7 @@ */ #define cxl_doorbell_busy(cxlm) \ - (readl((cxlm)->mbox_regs + CXLDEV_MBOX_CTRL_OFFSET) & \ + (readl((cxlm)->regs.mbox + CXLDEV_MBOX_CTRL_OFFSET) & \ CXLDEV_MBOX_CTRL_DOORBELL) /* CXL 2.0 - 8.2.8.4 */ @@ -271,7 +271,7 @@ static void cxl_mem_mbox_timeout(struct cxl_mem *cxlm, static int __cxl_mem_mbox_send_cmd(struct cxl_mem *cxlm, struct mbox_cmd *mbox_cmd) { - void __iomem *payload = cxlm->mbox_regs + CXLDEV_MBOX_PAYLOAD_OFFSET; + void __iomem *payload = cxlm->regs.mbox + CXLDEV_MBOX_PAYLOAD_OFFSET; u64 cmd_reg, status_reg; size_t out_len; int rc; @@ -314,12 +314,12 @@ static int __cxl_mem_mbox_send_cmd(struct cxl_mem *cxlm, } /* #2, #3 */ - writeq(cmd_reg, cxlm->mbox_regs + CXLDEV_MBOX_CMD_OFFSET); + writeq(cmd_reg, cxlm->regs.mbox + CXLDEV_MBOX_CMD_OFFSET); /* #4 */ dev_dbg(&cxlm->pdev->dev, "Sending command\n"); writel(CXLDEV_MBOX_CTRL_DOORBELL, - cxlm->mbox_regs + CXLDEV_MBOX_CTRL_OFFSET); + cxlm->regs.mbox + CXLDEV_MBOX_CTRL_OFFSET); /* #5 */ rc = cxl_mem_wait_for_doorbell(cxlm); @@ -329,7 +329,7 @@ static int __cxl_mem_mbox_send_cmd(struct cxl_mem *cxlm, } /* #6 */ - status_reg = readq(cxlm->mbox_regs + CXLDEV_MBOX_STATUS_OFFSET); + status_reg = readq(cxlm->regs.mbox + CXLDEV_MBOX_STATUS_OFFSET); mbox_cmd->return_code = FIELD_GET(CXLDEV_MBOX_STATUS_RET_CODE_MASK, status_reg); @@ -339,7 +339,7 @@ static int __cxl_mem_mbox_send_cmd(struct cxl_mem *cxlm, } /* #7 */ - cmd_reg = readq(cxlm->mbox_regs + CXLDEV_MBOX_CMD_OFFSET); + cmd_reg = readq(cxlm->regs.mbox + CXLDEV_MBOX_CMD_OFFSET); out_len = FIELD_GET(CXLDEV_MBOX_CMD_PAYLOAD_LENGTH_MASK, cmd_reg); /* #8 */ @@ -400,7 +400,7 @@ static int cxl_mem_mbox_get(struct cxl_mem *cxlm) goto out; } - md_status = readq(cxlm->memdev_regs + CXLMDEV_STATUS_OFFSET); + md_status = readq(cxlm->regs.memdev + CXLMDEV_STATUS_OFFSET); if (!(md_status & CXLMDEV_MBOX_IF_READY && CXLMDEV_READY(md_status))) { dev_err(dev, "mbox: reported doorbell ready, but not mbox ready\n"); rc = -EBUSY; @@ -868,7 +868,7 @@ static int cxl_mem_setup_regs(struct cxl_mem *cxlm) int cap, cap_count; u64 cap_array; - cap_array = readq(cxlm->regs + CXLDEV_CAP_ARRAY_OFFSET); + cap_array = readq(cxlm->base + CXLDEV_CAP_ARRAY_OFFSET); if (FIELD_GET(CXLDEV_CAP_ARRAY_ID_MASK, cap_array) != CXLDEV_CAP_ARRAY_CAP_ID) return -ENODEV; @@ -881,25 +881,25 @@ static int cxl_mem_setup_regs(struct cxl_mem *cxlm) u16 cap_id; cap_id = FIELD_GET(CXLDEV_CAP_HDR_CAP_ID_MASK, - readl(cxlm->regs + cap * 0x10)); - offset = readl(cxlm->regs + cap * 0x10 + 0x4); - register_block = cxlm->regs + offset; + readl(cxlm->base + cap * 0x10)); + offset = readl(cxlm->base + cap * 0x10 + 0x4); + register_block = cxlm->base + offset; switch (cap_id) { case CXLDEV_CAP_CAP_ID_DEVICE_STATUS: dev_dbg(dev, "found Status capability (0x%x)\n", offset); - cxlm->status_regs = register_block; + cxlm->regs.status = register_block; break; case CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX: dev_dbg(dev, "found Mailbox capability (0x%x)\n", offset); - cxlm->mbox_regs = register_block; + cxlm->regs.mbox = register_block; break; case CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX: dev_dbg(dev, "found Secondary Mailbox capability (0x%x)\n", offset); break; case CXLDEV_CAP_CAP_ID_MEMDEV: dev_dbg(dev, "found Memory Device capability (0x%x)\n", offset); - cxlm->memdev_regs = register_block; + cxlm->regs.memdev = register_block; break; default: dev_dbg(dev, "Unknown cap ID: %d (0x%x)\n", cap_id, offset); @@ -907,11 +907,11 @@ static int cxl_mem_setup_regs(struct cxl_mem *cxlm) } } - if (!cxlm->status_regs || !cxlm->mbox_regs || !cxlm->memdev_regs) { + if (!cxlm->regs.status || !cxlm->regs.mbox || !cxlm->regs.memdev) { dev_err(dev, "registers not found: %s%s%s\n", - !cxlm->status_regs ? "status " : "", - !cxlm->mbox_regs ? "mbox " : "", - !cxlm->memdev_regs ? "memdev" : ""); + !cxlm->regs.status ? "status " : "", + !cxlm->regs.mbox ? "mbox " : "", + !cxlm->regs.memdev ? "memdev" : ""); return -ENXIO; } @@ -920,7 +920,7 @@ static int cxl_mem_setup_regs(struct cxl_mem *cxlm) static int cxl_mem_setup_mailbox(struct cxl_mem *cxlm) { - const int cap = readl(cxlm->mbox_regs + CXLDEV_MBOX_CAPS_OFFSET); + const int cap = readl(cxlm->regs.mbox + CXLDEV_MBOX_CAPS_OFFSET); cxlm->payload_size = 1 << FIELD_GET(CXLDEV_MBOX_CAP_PAYLOAD_SIZE_MASK, cap); @@ -980,7 +980,7 @@ static struct cxl_mem *cxl_mem_create(struct pci_dev *pdev, u32 reg_lo, mutex_init(&cxlm->mbox_mutex); cxlm->pdev = pdev; - cxlm->regs = regs + offset; + cxlm->base = regs + offset; cxlm->enabled_cmds = devm_kmalloc_array(dev, BITS_TO_LONGS(cxl_cmd_count), sizeof(unsigned long), @@ -1495,6 +1495,10 @@ static __init int cxl_mem_init(void) dev_t devt; int rc; + /* Double check the anonymous union trickery in struct cxl_regs */ + BUILD_BUG_ON(offsetof(struct cxl_regs, memdev) != + offsetof(struct cxl_regs, device_regs.memdev)); + rc = alloc_chrdev_region(&devt, 0, CXL_MEM_MAX_DEVS, "cxl"); if (rc) return rc; diff --git a/drivers/cxl/mem.h b/drivers/cxl/mem.h index 616bb6fd721f..f4d89e816a89 100644 --- a/drivers/cxl/mem.h +++ b/drivers/cxl/mem.h @@ -53,10 +53,9 @@ struct cxl_memdev { /** * struct cxl_mem - A CXL memory device * @pdev: The PCI device associated with this CXL device. - * @regs: IO mappings to the device's MMIO - * @status_regs: CXL 2.0 8.2.8.3 Device Status Registers - * @mbox_regs: CXL 2.0 8.2.8.4 Mailbox Registers - * @memdev_regs: CXL 2.0 8.2.8.5 Memory Device Registers + * @base: IO mappings to the device's MMIO + * @cxlmd: Logical memory device chardev / interface + * @regs: Parsed register blocks * @payload_size: Size of space for payload * (CXL 2.0 8.2.8.4.3 Mailbox Capabilities Register) * @mbox_mutex: Mutex to synchronize mailbox access. @@ -67,12 +66,10 @@ struct cxl_memdev { */ struct cxl_mem { struct pci_dev *pdev; - void __iomem *regs; + void __iomem *base; struct cxl_memdev *cxlmd; - void __iomem *status_regs; - void __iomem *mbox_regs; - void __iomem *memdev_regs; + struct cxl_regs regs; size_t payload_size; struct mutex mbox_mutex; /* Protects device mailbox and firmware */ From patchwork Fri May 7 22:51:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12245309 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 866BEC433B4 for ; Fri, 7 May 2021 22:51:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 50477608FE for ; Fri, 7 May 2021 22:51:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230063AbhEGWwi (ORCPT ); Fri, 7 May 2021 18:52:38 -0400 Received: from mga01.intel.com ([192.55.52.88]:53407 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230034AbhEGWwi (ORCPT ); Fri, 7 May 2021 18:52:38 -0400 IronPort-SDR: bEQHjdFLMkPcXnxNHLRy/A25R9HX4tZ24SCKRFMoaqZQt+AiND66YsHU/CHyadf1HCLGBSSiTi bQ5lyWYj0SBw== X-IronPort-AV: E=McAfee;i="6200,9189,9977"; a="219737087" X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="219737087" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 15:51:37 -0700 IronPort-SDR: pzfd0DELys5GA/Gya8t6hVfplerTXsu5IN2ipwOrHMXQdyMcizgPph/022aTubxE6zS47B9D+B R2IWOEjyaxVw== X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="470054278" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.25]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 15:51:32 -0700 Subject: [PATCH 3/8] cxl/core: Rename bus.c to core.c From: Dan Williams To: linux-cxl@vger.kernel.org Cc: Ben Widawsky , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Date: Fri, 07 May 2021 15:51:31 -0700 Message-ID: <162042789118.1202325.17252779312531377335.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> References: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org In preparation for more generic shared functionality across endpoint consumers of core cxl resources, and platform-firmware producers of those resources, rename bus.c to core.c. In addition to the central rendezvous for interleave coordination, the core will also define common routines like CXL register block mapping. Acked-by: Ben Widawsky Signed-off-by: Dan Williams Reviewed-by: Jonathan Cameron --- Documentation/driver-api/cxl/memory-devices.rst | 6 ++--- drivers/cxl/Makefile | 4 ++- drivers/cxl/bus.c | 29 ---------------------- drivers/cxl/core.c | 30 +++++++++++++++++++++++ 4 files changed, 35 insertions(+), 34 deletions(-) delete mode 100644 drivers/cxl/bus.c create mode 100644 drivers/cxl/core.c diff --git a/Documentation/driver-api/cxl/memory-devices.rst b/Documentation/driver-api/cxl/memory-devices.rst index 1bad466f9167..71495ed77069 100644 --- a/Documentation/driver-api/cxl/memory-devices.rst +++ b/Documentation/driver-api/cxl/memory-devices.rst @@ -28,10 +28,10 @@ CXL Memory Device .. kernel-doc:: drivers/cxl/mem.c :internal: -CXL Bus +CXL Core ------- -.. kernel-doc:: drivers/cxl/bus.c - :doc: cxl bus +.. kernel-doc:: drivers/cxl/core.c + :doc: cxl core External Interfaces =================== diff --git a/drivers/cxl/Makefile b/drivers/cxl/Makefile index a314a1891f4d..3808e39dd31f 100644 --- a/drivers/cxl/Makefile +++ b/drivers/cxl/Makefile @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 -obj-$(CONFIG_CXL_BUS) += cxl_bus.o +obj-$(CONFIG_CXL_BUS) += cxl_core.o obj-$(CONFIG_CXL_MEM) += cxl_mem.o ccflags-y += -DDEFAULT_SYMBOL_NAMESPACE=CXL -cxl_bus-y := bus.o +cxl_core-y := core.o cxl_mem-y := mem.o diff --git a/drivers/cxl/bus.c b/drivers/cxl/bus.c deleted file mode 100644 index 58f74796d525..000000000000 --- a/drivers/cxl/bus.c +++ /dev/null @@ -1,29 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* Copyright(c) 2020 Intel Corporation. All rights reserved. */ -#include -#include - -/** - * DOC: cxl bus - * - * The CXL bus provides namespace for control devices and a rendezvous - * point for cross-device interleave coordination. - */ -struct bus_type cxl_bus_type = { - .name = "cxl", -}; -EXPORT_SYMBOL_GPL(cxl_bus_type); - -static __init int cxl_bus_init(void) -{ - return bus_register(&cxl_bus_type); -} - -static void cxl_bus_exit(void) -{ - bus_unregister(&cxl_bus_type); -} - -module_init(cxl_bus_init); -module_exit(cxl_bus_exit); -MODULE_LICENSE("GPL v2"); diff --git a/drivers/cxl/core.c b/drivers/cxl/core.c new file mode 100644 index 000000000000..7f8d2034038a --- /dev/null +++ b/drivers/cxl/core.c @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright(c) 2020 Intel Corporation. All rights reserved. */ +#include +#include + +/** + * DOC: cxl core + * + * The CXL core provides a sysfs hierarchy for control devices and a rendezvous + * point for cross-device interleave coordination through cxl ports. + */ + +struct bus_type cxl_bus_type = { + .name = "cxl", +}; +EXPORT_SYMBOL_GPL(cxl_bus_type); + +static __init int cxl_core_init(void) +{ + return bus_register(&cxl_bus_type); +} + +static void cxl_core_exit(void) +{ + bus_unregister(&cxl_bus_type); +} + +module_init(cxl_core_init); +module_exit(cxl_core_exit); +MODULE_LICENSE("GPL v2"); From patchwork Fri May 7 22:51:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12245311 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90565C433ED for ; Fri, 7 May 2021 22:51:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 69A8E608FE for ; Fri, 7 May 2021 22:51:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230103AbhEGWwo (ORCPT ); Fri, 7 May 2021 18:52:44 -0400 Received: from mga04.intel.com ([192.55.52.120]:57716 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230095AbhEGWwn (ORCPT ); Fri, 7 May 2021 18:52:43 -0400 IronPort-SDR: Rr9evBXOn4wgDrWfsmi4aGCXhxGt3JHHN2F95pmWaTEgdSwe9EGQSgI/5fepsRwLN49ky18c4e mRdioy5pW08A== X-IronPort-AV: E=McAfee;i="6200,9189,9977"; a="196817065" X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="196817065" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 15:51:42 -0700 IronPort-SDR: 8bMoU5ONJOmRYPfw/J7MunRVJ7jpoq2dZhokOn/dXYjw2uHSf/q6GeqtC3XYqRU1geFAN3Ewta zfA9bu+dByeQ== X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="533857168" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.25]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 15:51:42 -0700 Subject: [PATCH 4/8] cxl/core: Refactor CXL register lookup for bridge reuse From: Dan Williams To: linux-cxl@vger.kernel.org Cc: Ben Widawsky , Jonathan Cameron , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Date: Fri, 07 May 2021 15:51:42 -0700 Message-ID: <162042790221.1202325.17592119380528540070.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> References: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org While CXL Memory Device endpoints locate the CXL MMIO registers in a PCI BAR, CXL root bridges have their MMIO base address described by platform firmware. Refactor the existing register lookup into a generic facility for endpoints and bridges to share. Reviewed-by: Ben Widawsky Reviewed-by: Jonathan Cameron Signed-off-by: Dan Williams --- drivers/cxl/core.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++ drivers/cxl/cxl.h | 3 +++ drivers/cxl/mem.c | 50 ++++++---------------------------------------- 3 files changed, 65 insertions(+), 44 deletions(-) diff --git a/drivers/cxl/core.c b/drivers/cxl/core.c index 7f8d2034038a..d94c4c2dee8f 100644 --- a/drivers/cxl/core.c +++ b/drivers/cxl/core.c @@ -2,6 +2,7 @@ /* Copyright(c) 2020 Intel Corporation. All rights reserved. */ #include #include +#include "cxl.h" /** * DOC: cxl core @@ -10,6 +11,61 @@ * point for cross-device interleave coordination through cxl ports. */ +/** + * cxl_setup_device_regs() - Detect CXL Device register blocks + * @dev: Host device of the @base mapping + * @base: Mapping of CXL 2.0 8.2.8 CXL Device Register Interface + * @regs: Base pointers for device register blocks (see CXL_DEVICE_REGS()) + */ +void cxl_setup_device_regs(struct device *dev, void __iomem *base, + struct cxl_device_regs *regs) +{ + int cap, cap_count; + u64 cap_array; + + *regs = (struct cxl_device_regs) { 0 }; + + cap_array = readq(base + CXLDEV_CAP_ARRAY_OFFSET); + if (FIELD_GET(CXLDEV_CAP_ARRAY_ID_MASK, cap_array) != + CXLDEV_CAP_ARRAY_CAP_ID) + return; + + cap_count = FIELD_GET(CXLDEV_CAP_ARRAY_COUNT_MASK, cap_array); + + for (cap = 1; cap <= cap_count; cap++) { + void __iomem *register_block; + u32 offset; + u16 cap_id; + + cap_id = FIELD_GET(CXLDEV_CAP_HDR_CAP_ID_MASK, + readl(base + cap * 0x10)); + offset = readl(base + cap * 0x10 + 0x4); + register_block = base + offset; + + switch (cap_id) { + case CXLDEV_CAP_CAP_ID_DEVICE_STATUS: + dev_dbg(dev, "found Status capability (0x%x)\n", offset); + regs->status = register_block; + break; + case CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX: + dev_dbg(dev, "found Mailbox capability (0x%x)\n", offset); + regs->mbox = register_block; + break; + case CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX: + dev_dbg(dev, "found Secondary Mailbox capability (0x%x)\n", offset); + break; + case CXLDEV_CAP_CAP_ID_MEMDEV: + dev_dbg(dev, "found Memory Device capability (0x%x)\n", offset); + regs->memdev = register_block; + break; + default: + dev_dbg(dev, "Unknown cap ID: %d (0x%x)\n", cap_id, offset); + break; + } + } +} +EXPORT_SYMBOL_GPL(cxl_setup_device_regs); + struct bus_type cxl_bus_type = { .name = "cxl", }; diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 1f3434f89ef2..d49e0cb679fa 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -66,5 +66,8 @@ struct cxl_regs { }; }; +void cxl_setup_device_regs(struct device *dev, void __iomem *base, + struct cxl_device_regs *regs); + extern struct bus_type cxl_bus_type; #endif /* __CXL_H__ */ diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index 6951243d128e..ee55abfa147e 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -865,53 +865,15 @@ static int cxl_mem_mbox_send_cmd(struct cxl_mem *cxlm, u16 opcode, static int cxl_mem_setup_regs(struct cxl_mem *cxlm) { struct device *dev = &cxlm->pdev->dev; - int cap, cap_count; - u64 cap_array; + struct cxl_regs *regs = &cxlm->regs; - cap_array = readq(cxlm->base + CXLDEV_CAP_ARRAY_OFFSET); - if (FIELD_GET(CXLDEV_CAP_ARRAY_ID_MASK, cap_array) != - CXLDEV_CAP_ARRAY_CAP_ID) - return -ENODEV; - - cap_count = FIELD_GET(CXLDEV_CAP_ARRAY_COUNT_MASK, cap_array); - - for (cap = 1; cap <= cap_count; cap++) { - void __iomem *register_block; - u32 offset; - u16 cap_id; - - cap_id = FIELD_GET(CXLDEV_CAP_HDR_CAP_ID_MASK, - readl(cxlm->base + cap * 0x10)); - offset = readl(cxlm->base + cap * 0x10 + 0x4); - register_block = cxlm->base + offset; - - switch (cap_id) { - case CXLDEV_CAP_CAP_ID_DEVICE_STATUS: - dev_dbg(dev, "found Status capability (0x%x)\n", offset); - cxlm->regs.status = register_block; - break; - case CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX: - dev_dbg(dev, "found Mailbox capability (0x%x)\n", offset); - cxlm->regs.mbox = register_block; - break; - case CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX: - dev_dbg(dev, "found Secondary Mailbox capability (0x%x)\n", offset); - break; - case CXLDEV_CAP_CAP_ID_MEMDEV: - dev_dbg(dev, "found Memory Device capability (0x%x)\n", offset); - cxlm->regs.memdev = register_block; - break; - default: - dev_dbg(dev, "Unknown cap ID: %d (0x%x)\n", cap_id, offset); - break; - } - } + cxl_setup_device_regs(dev, cxlm->base, ®s->device_regs); - if (!cxlm->regs.status || !cxlm->regs.mbox || !cxlm->regs.memdev) { + if (!regs->status || !regs->mbox || !regs->memdev) { dev_err(dev, "registers not found: %s%s%s\n", - !cxlm->regs.status ? "status " : "", - !cxlm->regs.mbox ? "mbox " : "", - !cxlm->regs.memdev ? "memdev" : ""); + !regs->status ? "status " : "", + !regs->mbox ? "mbox " : "", + !regs->memdev ? "memdev" : ""); return -ENXIO; } From patchwork Fri May 7 22:51:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12245313 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C16EEC433B4 for ; Fri, 7 May 2021 22:51:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8A75D608FE for ; Fri, 7 May 2021 22:51:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230167AbhEGWwv (ORCPT ); Fri, 7 May 2021 18:52:51 -0400 Received: from mga17.intel.com ([192.55.52.151]:18235 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230124AbhEGWws (ORCPT ); Fri, 7 May 2021 18:52:48 -0400 IronPort-SDR: lxMtTChRdZO+L/dYCrfTuLefVC2Rj92AOl2+V4+ZNeiUWZWDsgC4CoFSJs0sxldxj7dpGGHiay dBJfg7xMnI5Q== X-IronPort-AV: E=McAfee;i="6200,9189,9977"; a="179072641" X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="179072641" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 15:51:48 -0700 IronPort-SDR: bifzx0EGkUD3jccCfMC1yTX/pR1XtSqWlaRIzfEul9E0ymoFZibiedXOSmN7dJG/2L9pQxkNSX MdGebq2KQN7w== X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="407595021" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.25]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 15:51:48 -0700 Subject: [PATCH 5/8] cxl/acpi: Introduce ACPI0017 driver and cxl_root From: Dan Williams To: linux-cxl@vger.kernel.org Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Date: Fri, 07 May 2021 15:51:47 -0700 Message-ID: <162042790793.1202325.13507889482183963289.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> References: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org While CXL builds upon the PCI software model for dynamic enumeration and control, a static platform component is required to bootstrap the CXL memory layout. In addition to identifying the host bridges ACPI is responsible for enumerating the CXL memory space that can be addressed by decoders. This is similar to the requirement for ACPI to publish resources reported by _CRS for PCI host bridges. Introduce the cxl_root object as an abstract "port" into the CXL.mem address space described by HDM decoders identified by the ACPI CEDT.CHBS. For now just establish the initial boilerplate and sysfs attributes, to be followed by enumeration of the ports within the host bridge. Note the allocation of CXL core device objects is split into separate alloc and add steps in order to separate the alloc error path (kfree()) from the device add error path (put_device()). Signed-off-by: Dan Williams --- drivers/cxl/Kconfig | 14 ++ drivers/cxl/Makefile | 2 drivers/cxl/acpi.c | 39 +++++ drivers/cxl/core.c | 356 ++++++++++++++++++++++++++++++++++++++++++++++++++ drivers/cxl/cxl.h | 65 +++++++++ 5 files changed, 476 insertions(+) create mode 100644 drivers/cxl/acpi.c diff --git a/drivers/cxl/Kconfig b/drivers/cxl/Kconfig index 97dc4d751651..fb282af84afd 100644 --- a/drivers/cxl/Kconfig +++ b/drivers/cxl/Kconfig @@ -50,4 +50,18 @@ config CXL_MEM_RAW_COMMANDS potential impact to memory currently in use by the kernel. If developing CXL hardware or the driver say Y, otherwise say N. + +config CXL_ACPI + tristate "CXL ACPI: Platform Support" + depends on ACPI + help + Enable support for host managed device memory (HDM) resources + published by a platform's ACPI CXL memory layout description. + See Chapter 9.14.1 CXL Early Discovery Table (CEDT) in the CXL + 2.0 specification. The CXL core consumes these resource to + publish port and address_space objects used to map regions + that represent System RAM, or Persistent Memory regions to be + managed by LIBNVDIMM. + + If unsure say 'm'. endif diff --git a/drivers/cxl/Makefile b/drivers/cxl/Makefile index 3808e39dd31f..f429ca6b59d9 100644 --- a/drivers/cxl/Makefile +++ b/drivers/cxl/Makefile @@ -1,7 +1,9 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_CXL_BUS) += cxl_core.o obj-$(CONFIG_CXL_MEM) += cxl_mem.o +obj-$(CONFIG_CXL_ACPI) += cxl_acpi.o ccflags-y += -DDEFAULT_SYMBOL_NAMESPACE=CXL cxl_core-y := core.o cxl_mem-y := mem.o +cxl_acpi-y := acpi.o diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c new file mode 100644 index 000000000000..d54c2d5de730 --- /dev/null +++ b/drivers/cxl/acpi.c @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright(c) 2021 Intel Corporation. All rights reserved. */ +#include +#include +#include +#include +#include +#include "cxl.h" + +static int cxl_acpi_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cxl_root *cxl_root; + + cxl_root = devm_cxl_add_root(dev, NULL, 0); + if (IS_ERR(cxl_root)) + return PTR_ERR(cxl_root); + dev_dbg(dev, "register: %s\n", dev_name(&cxl_root->port.dev)); + + return 0; +} + +static const struct acpi_device_id cxl_acpi_ids[] = { + { "ACPI0017", 0 }, + { "", 0 }, +}; +MODULE_DEVICE_TABLE(acpi, cxl_acpi_ids); + +static struct platform_driver cxl_acpi_driver = { + .probe = cxl_acpi_probe, + .driver = { + .name = KBUILD_MODNAME, + .acpi_match_table = cxl_acpi_ids, + }, +}; + +module_platform_driver(cxl_acpi_driver); +MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(CXL); diff --git a/drivers/cxl/core.c b/drivers/cxl/core.c index d94c4c2dee8f..347824a62a66 100644 --- a/drivers/cxl/core.c +++ b/drivers/cxl/core.c @@ -2,6 +2,8 @@ /* Copyright(c) 2020 Intel Corporation. All rights reserved. */ #include #include +#include +#include #include "cxl.h" /** @@ -11,6 +13,360 @@ * point for cross-device interleave coordination through cxl ports. */ +static DEFINE_IDA(cxl_port_ida); + +static ssize_t devtype_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%s\n", dev->type->name); +} +static DEVICE_ATTR_RO(devtype); + +static struct attribute *cxl_base_attributes[] = { + &dev_attr_devtype.attr, + NULL, +}; + +static struct attribute_group cxl_base_attribute_group = { + .attrs = cxl_base_attributes, +}; + +static struct cxl_address_space *dev_to_address_space(struct device *dev) +{ + struct cxl_address_space_dev *cxl_asd = to_cxl_address_space(dev); + + return cxl_asd->address_space; +} + +static ssize_t start_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct cxl_address_space *space = dev_to_address_space(dev); + + return sysfs_emit(buf, "%#llx\n", space->range.start); +} +static DEVICE_ATTR_RO(start); + +static ssize_t end_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct cxl_address_space *space = dev_to_address_space(dev); + + return sysfs_emit(buf, "%#llx\n", space->range.end); +} +static DEVICE_ATTR_RO(end); + +#define CXL_ATTR_SUPPORTS(name, flag) \ +static ssize_t supports_##name##_show( \ + struct device *dev, struct device_attribute *attr, char *buf) \ +{ \ + struct cxl_address_space *space = dev_to_address_space(dev); \ + \ + return sysfs_emit(buf, "%s\n", \ + (space->flags & (flag)) ? "1" : "0"); \ +} \ +static DEVICE_ATTR_RO(supports_##name) + +CXL_ATTR_SUPPORTS(pmem, CXL_ADDRSPACE_PMEM); +CXL_ATTR_SUPPORTS(ram, CXL_ADDRSPACE_RAM); +CXL_ATTR_SUPPORTS(type2, CXL_ADDRSPACE_TYPE2); +CXL_ATTR_SUPPORTS(type3, CXL_ADDRSPACE_TYPE3); + +static struct attribute *cxl_address_space_attributes[] = { + &dev_attr_start.attr, + &dev_attr_end.attr, + &dev_attr_supports_pmem.attr, + &dev_attr_supports_ram.attr, + &dev_attr_supports_type2.attr, + &dev_attr_supports_type3.attr, + NULL, +}; + +static umode_t cxl_address_space_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct cxl_address_space *space = dev_to_address_space(dev); + + if (a == &dev_attr_supports_pmem.attr && + !(space->flags & CXL_ADDRSPACE_PMEM)) + return 0; + + if (a == &dev_attr_supports_ram.attr && + !(space->flags & CXL_ADDRSPACE_RAM)) + return 0; + + if (a == &dev_attr_supports_type2.attr && + !(space->flags & CXL_ADDRSPACE_TYPE2)) + return 0; + + if (a == &dev_attr_supports_type3.attr && + !(space->flags & CXL_ADDRSPACE_TYPE3)) + return 0; + + return a->mode; +} + +static struct attribute_group cxl_address_space_attribute_group = { + .attrs = cxl_address_space_attributes, + .is_visible = cxl_address_space_visible, +}; + +static const struct attribute_group *cxl_address_space_attribute_groups[] = { + &cxl_address_space_attribute_group, + &cxl_base_attribute_group, + NULL, +}; + +static void cxl_address_space_release(struct device *dev) +{ + struct cxl_address_space_dev *cxl_asd = to_cxl_address_space(dev); + + remove_resource(&cxl_asd->res); + kfree(cxl_asd); +} + +static const struct device_type cxl_address_space_type = { + .name = "cxl_address_space", + .release = cxl_address_space_release, + .groups = cxl_address_space_attribute_groups, +}; + +struct cxl_address_space_dev *to_cxl_address_space(struct device *dev) +{ + if (dev_WARN_ONCE(dev, dev->type != &cxl_address_space_type, + "not a cxl_address_space device\n")) + return NULL; + return container_of(dev, struct cxl_address_space_dev, dev); +} + +static void cxl_root_release(struct device *dev) +{ + struct cxl_root *cxl_root = to_cxl_root(dev); + + ida_free(&cxl_port_ida, cxl_root->port.id); + kfree(cxl_root); +} + +static ssize_t target_id_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct cxl_port *cxl_port = to_cxl_port(dev); + + return sysfs_emit(buf, "%d\n", cxl_port->target_id); +} +static DEVICE_ATTR_RO(target_id); + +static struct attribute *cxl_port_attributes[] = { + &dev_attr_target_id.attr, + NULL, +}; + +static struct attribute_group cxl_port_attribute_group = { + .attrs = cxl_port_attributes, +}; + +static const struct attribute_group *cxl_port_attribute_groups[] = { + &cxl_port_attribute_group, + &cxl_base_attribute_group, + NULL, +}; + +static const struct device_type cxl_root_type = { + .name = "cxl_root", + .release = cxl_root_release, + .groups = cxl_port_attribute_groups, +}; + +struct cxl_root *to_cxl_root(struct device *dev) +{ + if (dev_WARN_ONCE(dev, dev->type != &cxl_root_type, + "not a cxl_root device\n")) + return NULL; + return container_of(dev, struct cxl_root, port.dev); +} + +struct cxl_port *to_cxl_port(struct device *dev) +{ + if (dev_WARN_ONCE(dev, dev->type != &cxl_root_type, + "not a cxl_port device\n")) + return NULL; + return container_of(dev, struct cxl_port, dev); +} + +static void unregister_dev(void *dev) +{ + device_unregister(dev); +} + +static struct cxl_root *cxl_root_alloc(struct device *parent, + struct cxl_address_space *cxl_space, + int nr_spaces) +{ + struct cxl_root *cxl_root; + struct cxl_port *port; + struct device *dev; + int rc; + + cxl_root = kzalloc(struct_size(cxl_root, address_space, nr_spaces), + GFP_KERNEL); + if (!cxl_root) + return ERR_PTR(-ENOMEM); + + memcpy(cxl_root->address_space, cxl_space, + flex_array_size(cxl_root, address_space, nr_spaces)); + cxl_root->nr_spaces = nr_spaces; + + rc = ida_alloc(&cxl_port_ida, GFP_KERNEL); + if (rc < 0) + goto err; + port = &cxl_root->port; + port->id = rc; + + /* + * Root does not have a cxl_port as its parent and it does not + * have any corresponding component registers. It is only a + * logical anchor to the first level of actual ports that decode + * the root address spaces. + */ + port->port_host = parent; + port->target_id = -1; + port->component_regs_phys = -1; + + dev = &port->dev; + device_initialize(dev); + device_set_pm_not_required(dev); + dev->parent = parent; + dev->bus = &cxl_bus_type; + dev->type = &cxl_root_type; + + return cxl_root; + +err: + kfree(cxl_root); + return ERR_PTR(rc); +} + +static struct cxl_address_space_dev * +cxl_address_space_dev_alloc(struct device *parent, + struct cxl_address_space *space) +{ + struct cxl_address_space_dev *cxl_asd; + struct resource *res; + struct device *dev; + int rc; + + cxl_asd = kzalloc(sizeof(*cxl_asd), GFP_KERNEL); + if (!cxl_asd) + return ERR_PTR(-ENOMEM); + + res = &cxl_asd->res; + res->name = "CXL Address Space"; + res->start = space->range.start; + res->end = space->range.end; + res->flags = IORESOURCE_MEM; + + rc = insert_resource(&iomem_resource, res); + if (rc) + goto err; + + cxl_asd->address_space = space; + dev = &cxl_asd->dev; + device_initialize(dev); + device_set_pm_not_required(dev); + dev->parent = parent; + dev->type = &cxl_address_space_type; + + return cxl_asd; + +err: + kfree(cxl_asd); + return ERR_PTR(rc); +} + + +/** + * cxl_address_space_dev_add() - Name and add the cxl address space device + * @host: devm context to trigger device removal at @host ->remove() + * @cxl_asd: address space device to add + * @id: index in the root array of address spaces and name component + */ +static int cxl_address_space_dev_add(struct device *host, + struct cxl_address_space_dev *cxl_asd, + int id) +{ + struct device *dev = &cxl_asd->dev; + int rc; + + rc = dev_set_name(dev, "address_space%d", id); + if (rc) + goto err; + + rc = device_add(dev); + if (rc) + goto err; + + dev_dbg(host, "%s: register %s\n", dev_name(dev->parent), + dev_name(dev)); + + return devm_add_action_or_reset(host, unregister_dev, dev); + +err: + put_device(dev); + return rc; +} + +struct cxl_root *devm_cxl_add_root(struct device *host, + struct cxl_address_space *cxl_space, + int nr_spaces) +{ + struct cxl_root *cxl_root; + struct cxl_port *port; + struct device *dev; + int i, rc; + + cxl_root = cxl_root_alloc(host, cxl_space, nr_spaces); + if (IS_ERR(cxl_root)) + return cxl_root; + + port = &cxl_root->port; + dev = &port->dev; + rc = dev_set_name(dev, "root%d", port->id); + if (rc) + goto err; + + rc = device_add(dev); + if (rc) + goto err; + + rc = devm_add_action_or_reset(host, unregister_dev, dev); + if (rc) + return ERR_PTR(rc); + + for (i = 0; i < nr_spaces; i++) { + struct cxl_address_space *space = &cxl_root->address_space[i]; + struct cxl_address_space_dev *cxl_asd; + + if (!range_len(&space->range)) + continue; + + cxl_asd = cxl_address_space_dev_alloc(dev, space); + if (IS_ERR(cxl_asd)) + return ERR_CAST(cxl_asd); + + rc = cxl_address_space_dev_add(host, cxl_asd, i); + if (rc) + return ERR_PTR(rc); + } + + return cxl_root; + +err: + put_device(dev); + return ERR_PTR(rc); +} +EXPORT_SYMBOL_GPL(devm_cxl_add_root); + /** * cxl_setup_device_regs() - Detect CXL Device register blocks * @dev: Host device of the @base mapping diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index d49e0cb679fa..5cd1173151e5 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -6,6 +6,7 @@ #include #include +#include #include /* CXL 2.0 8.2.8.1 Device Capabilities Array Register */ @@ -69,5 +70,69 @@ struct cxl_regs { void cxl_setup_device_regs(struct device *dev, void __iomem *base, struct cxl_device_regs *regs); +/* + * Address space properties derived from: + * CXL 2.0 8.2.5.12.7 CXL HDM Decoder 0 Control Register + */ +#define CXL_ADDRSPACE_RAM BIT(0) +#define CXL_ADDRSPACE_PMEM BIT(1) +#define CXL_ADDRSPACE_TYPE2 BIT(2) +#define CXL_ADDRSPACE_TYPE3 BIT(3) +#define CXL_ADDRSPACE_MASK GENMASK(3, 0) + +struct cxl_address_space { + struct range range; + int interleave_size; + unsigned long flags; + unsigned long targets; +}; + +struct cxl_address_space_dev { + struct device dev; + struct resource res; + struct cxl_address_space *address_space; +}; + +/** + * struct cxl_port - object representing a root, upstream, or downstream port + * @dev: this port's device + * @port_host: PCI or platform device host of the CXL capability + * @id: id for port device-name + * @target_id: this port's HDM decoder id in the parent port + * @component_regs_phys: component register capability array base address + */ +struct cxl_port { + struct device dev; + struct device *port_host; + int id; + int target_id; + resource_size_t component_regs_phys; +}; + +/* + * struct cxl_root - platform object parent of CXL host bridges + * + * A cxl_root object represents a set of address spaces that are + * interleaved across a set of child host bridges, but never interleaved + * to another cxl_root object. It contains a cxl_port that is a special + * case in that it does not have a parent port and related HDMs, instead + * its decode is derived from the root (platform firmware defined) + * address space description. Not to be confused with CXL Root Ports + * that are the PCIE Root Ports within PCIE Host Bridges that are + * flagged by platform firmware (ACPI0016 on ACPI platforms) as having + * CXL capabilities. + */ +struct cxl_root { + struct cxl_port port; + int nr_spaces; + struct cxl_address_space address_space[]; +}; + +struct cxl_root *to_cxl_root(struct device *dev); +struct cxl_port *to_cxl_port(struct device *dev); +struct cxl_address_space_dev *to_cxl_address_space(struct device *dev); +struct cxl_root *devm_cxl_add_root(struct device *parent, + struct cxl_address_space *cxl_space, + int nr_spaces); extern struct bus_type cxl_bus_type; #endif /* __CXL_H__ */ From patchwork Fri May 7 22:51:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12245315 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5C8F9C433ED for ; Fri, 7 May 2021 22:51:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2592960249 for ; Fri, 7 May 2021 22:51:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230095AbhEGWwz (ORCPT ); Fri, 7 May 2021 18:52:55 -0400 Received: from mga05.intel.com ([192.55.52.43]:33170 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230127AbhEGWwy (ORCPT ); Fri, 7 May 2021 18:52:54 -0400 IronPort-SDR: /IceLBQd1ZAF3JAfBgJIABnEFsjXEtLedAqqAfmwgmk9L2KRjrvFPFxwNTj0ejKvF3a/X6Cyit hS5HDR2er7NQ== X-IronPort-AV: E=McAfee;i="6200,9189,9977"; a="284290002" X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="284290002" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 15:51:53 -0700 IronPort-SDR: tvmuAuxoalOBgvgxiNZhhRRdhxOJ63QJbPSu5nIQWw49+1+TZhctp5f9Z4WcuAPX4Ywdz4Bq2+ j0AtepNVX9Cw== X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="465900959" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.25]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 15:51:53 -0700 Subject: [PATCH 6/8] cxl/Kconfig: Default drivers to CONFIG_CXL_BUS From: Dan Williams To: linux-cxl@vger.kernel.org Cc: Ben Widawsky , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Date: Fri, 07 May 2021 15:51:53 -0700 Message-ID: <162042791307.1202325.2513845748708305095.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> References: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org CONFIG_CXL_BUS is default 'n' as expected for new functionality. When that is enabled do not make the end user hunt for all the expected sub-options to enable. For example CONFIG_CXL_BUS without CONFIG_CXL_MEM is an odd/expert configuration, so is CONFIG_CXL_MEM without CONFIG_CXL_ACPI (on ACPI capable platforms). Default CONFIG_CXL_MEM and CONFIG_CXL_ACPI to CONFIG_CXL_BUS. Acked-by: Ben Widawsky Signed-off-by: Dan Williams Acked-by: Jonathan Cameron --- drivers/cxl/Kconfig | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/cxl/Kconfig b/drivers/cxl/Kconfig index fb282af84afd..1da7970a5e55 100644 --- a/drivers/cxl/Kconfig +++ b/drivers/cxl/Kconfig @@ -15,6 +15,7 @@ if CXL_BUS config CXL_MEM tristate "CXL.mem: Memory Devices" + default CXL_BUS help The CXL.mem protocol allows a device to act as a provider of "System RAM" and/or "Persistent Memory" that is fully coherent @@ -54,6 +55,7 @@ config CXL_MEM_RAW_COMMANDS config CXL_ACPI tristate "CXL ACPI: Platform Support" depends on ACPI + default CXL_BUS help Enable support for host managed device memory (HDM) resources published by a platform's ACPI CXL memory layout description. From patchwork Fri May 7 22:51:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12245317 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3630DC433B4 for ; Fri, 7 May 2021 22:52:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0ACFA608FE for ; Fri, 7 May 2021 22:52:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230213AbhEGWxA (ORCPT ); Fri, 7 May 2021 18:53:00 -0400 Received: from mga04.intel.com ([192.55.52.120]:57733 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230099AbhEGWxA (ORCPT ); Fri, 7 May 2021 18:53:00 -0400 IronPort-SDR: XZ8Sq9zjJ+7dPE0wcYW97rLhsj1oCRt5xtxZFsJLDLTX2NMABUwIz8SgTMXqKZdXEohfvG9J57 yob0TR2215tQ== X-IronPort-AV: E=McAfee;i="6200,9189,9977"; a="196817080" X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="196817080" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 15:51:59 -0700 IronPort-SDR: thxe0I32aIdMRfM+qtA3+mEbQxk28oca14Puao6Duo770jPWrTxms+OgmYCaOlCaxV/zpnw6Fg si0rQAqHqHTg== X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="540495724" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.25]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 15:51:58 -0700 Subject: [PATCH 7/8] cxl/port: Introduce cxl_port objects From: Dan Williams To: linux-cxl@vger.kernel.org Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Date: Fri, 07 May 2021 15:51:58 -0700 Message-ID: <162042791852.1202325.8197739881935753009.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> References: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org Once the cxl_root is established then other ports in the hierarchy can be attached. The cxl_port object, unlike cxl_root that is associated with host bridges, is associated with PCIe Root Ports or PCIe Switch Ports. Add cxl_port instances for all PCIe Root Ports in an ACPI0016 host bridge. The cxl_port instances for PCIe Switch Ports are not included here as those are to be modeled as another service device registered on the pcie_port_bus_type. A sample sysfs topology for a single-host-bridge with single-PCIe/CXL-port follows: /sys/bus/cxl/devices/root0 ├── address_space0 │   ├── devtype │   ├── end │   ├── start │   ├── supports_ram │   ├── supports_type2 │   ├── supports_type3 │   └── uevent ├── address_space1 │   ├── devtype │   ├── end │   ├── start │   ├── supports_pmem │   ├── supports_type2 │   ├── supports_type3 │   └── uevent ├── devtype ├── port1 │   ├── devtype │   ├── host -> ../../../../LNXSYSTM:00/LNXSYBUS:00/ACPI0016:00 │   ├── port2 │   │   ├── devtype │   │   ├── host -> ../../../../../pci0000:34/0000:34:00.0 │   │   ├── subsystem -> ../../../../../../bus/cxl │   │   ├── target_id │   │   └── uevent │   ├── subsystem -> ../../../../../bus/cxl │   ├── target_id │   └── uevent ├── subsystem -> ../../../../bus/cxl ├── target_id └── uevent In this listing the system-wide-singleton root0 has 2 address spaces, 1 PMEM and 1 RAM. Those address spaces are accessed through port1 which represents the upstream port of an ACPI0016 host-bridge. A multi-host-bridge system would have other ports as peers to port1 to additionally decode root level address spaces. Port2 in this diagram represents the single downstream port of the host-bridge. Were it to be a multi-ported-host-bridge there would be peers / siblings of port2 with port1 as their common ancestor. The rationale for this port hierarchy is to be able to walk the HDM decoder register sets that each port implements. Additionally it provides a representation of host-bridge interleave which will be necessary for follow-on work that adds CXL region devices. The details in the /sys/bus/cxl hierarchy that are not suitable to be represented in the /sys/bus/pci hierarchy are: - memory address spaces that are interleaved across host bridges - common sub-device functionality represented by CXL component + device registers (enumerated via DVSEC or platform firmware (ACPI CEDT)). Signed-off-by: Dan Williams Reported-by: kernel test robot Reviewed-by: Jonathan Cameron --- drivers/cxl/acpi.c | 99 +++++++++++++++++++++++++++++++++++++++++++ drivers/cxl/core.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++ drivers/cxl/cxl.h | 5 ++ 3 files changed, 224 insertions(+), 1 deletion(-) diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index d54c2d5de730..bc2a35ae880b 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -5,18 +5,117 @@ #include #include #include +#include #include "cxl.h" +static int match_ACPI0016(struct device *dev, const void *host) +{ + struct acpi_device *adev = to_acpi_device(dev); + const char *hid = acpi_device_hid(adev); + + return strcmp(hid, "ACPI0016") == 0; +} + +struct cxl_walk_context { + struct device *dev; + struct pci_bus *root; + struct cxl_port *port; + int error; + int count; +}; + +static int match_add_root_ports(struct pci_dev *pdev, void *data) +{ + struct cxl_walk_context *ctx = data; + struct pci_bus *root_bus = ctx->root; + struct cxl_port *port = ctx->port; + int type = pci_pcie_type(pdev); + struct device *dev = ctx->dev; + resource_size_t cxl_regs_phys; + int target_id = ctx->count; + + if (pdev->bus != root_bus) + return 0; + if (!pci_is_pcie(pdev)) + return 0; + if (type != PCI_EXP_TYPE_ROOT_PORT) + return 0; + + ctx->count++; + + /* TODO walk DVSEC to find component register base */ + cxl_regs_phys = -1; + + port = devm_cxl_add_port(dev, port, &pdev->dev, target_id, + cxl_regs_phys); + if (IS_ERR(port)) { + ctx->error = PTR_ERR(port); + return ctx->error; + } + + dev_dbg(dev, "%s: register: %s\n", dev_name(&pdev->dev), + dev_name(&port->dev)); + + return 0; +} + +/* + * A host bridge may contain one or more root ports. Register each port + * as a child of the cxl_root. + */ +static int cxl_acpi_register_ports(struct device *dev, struct acpi_device *root, + struct cxl_port *port, int idx) +{ + struct acpi_pci_root *pci_root = acpi_pci_find_root(root->handle); + struct cxl_walk_context ctx; + + if (!pci_root) + return -ENXIO; + + /* TODO: fold in CEDT.CHBS retrieval */ + port = devm_cxl_add_port(dev, port, &root->dev, idx, ~0ULL); + if (IS_ERR(port)) + return PTR_ERR(port); + dev_dbg(dev, "%s: register: %s\n", dev_name(&root->dev), + dev_name(&port->dev)); + + ctx = (struct cxl_walk_context) { + .dev = dev, + .root = pci_root->bus, + .port = port, + }; + pci_walk_bus(pci_root->bus, match_add_root_ports, &ctx); + + if (ctx.count == 0) + return -ENODEV; + return ctx.error; +} + static int cxl_acpi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; + struct acpi_device *adev = ACPI_COMPANION(dev); + struct device *bridge = NULL; struct cxl_root *cxl_root; + int rc, i = 0; cxl_root = devm_cxl_add_root(dev, NULL, 0); if (IS_ERR(cxl_root)) return PTR_ERR(cxl_root); dev_dbg(dev, "register: %s\n", dev_name(&cxl_root->port.dev)); + while (true) { + bridge = bus_find_device(adev->dev.bus, bridge, dev, + match_ACPI0016); + if (!bridge) + break; + + rc = cxl_acpi_register_ports(dev, to_acpi_device(bridge), + &cxl_root->port, i++); + if (rc) + return rc; + } + return 0; } diff --git a/drivers/cxl/core.c b/drivers/cxl/core.c index 347824a62a66..cc9af9033292 100644 --- a/drivers/cxl/core.c +++ b/drivers/cxl/core.c @@ -148,6 +148,15 @@ static void cxl_root_release(struct device *dev) kfree(cxl_root); } +static void cxl_port_release(struct device *dev) +{ + struct cxl_port *port = to_cxl_port(dev); + + ida_free(&cxl_port_ida, port->id); + put_device(port->port_host); + kfree(port); +} + static ssize_t target_id_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -178,6 +187,12 @@ static const struct device_type cxl_root_type = { .groups = cxl_port_attribute_groups, }; +static const struct device_type cxl_port_type = { + .name = "cxl_port", + .release = cxl_port_release, + .groups = cxl_port_attribute_groups, +}; + struct cxl_root *to_cxl_root(struct device *dev) { if (dev_WARN_ONCE(dev, dev->type != &cxl_root_type, @@ -188,7 +203,9 @@ struct cxl_root *to_cxl_root(struct device *dev) struct cxl_port *to_cxl_port(struct device *dev) { - if (dev_WARN_ONCE(dev, dev->type != &cxl_root_type, + if (dev_WARN_ONCE(dev, + dev->type != &cxl_root_type && + dev->type != &cxl_port_type, "not a cxl_port device\n")) return NULL; return container_of(dev, struct cxl_port, dev); @@ -367,6 +384,108 @@ struct cxl_root *devm_cxl_add_root(struct device *host, } EXPORT_SYMBOL_GPL(devm_cxl_add_root); +static void cxl_unlink_port(void *_port) +{ + struct cxl_port *port = _port; + + sysfs_remove_link(&port->dev.kobj, "host"); +} + +static int devm_cxl_link_port(struct device *dev, struct cxl_port *port) +{ + int rc; + + rc = sysfs_create_link(&port->dev.kobj, &port->port_host->kobj, "host"); + if (rc) + return rc; + return devm_add_action_or_reset(dev, cxl_unlink_port, port); +} + +static struct cxl_port *cxl_port_alloc(struct cxl_port *parent_port, + struct device *port_dev, int target_id, + resource_size_t component_regs_phys) +{ + struct cxl_port *port; + struct device *dev; + int rc; + + if (!port_dev) + return ERR_PTR(-EINVAL); + + port = kzalloc(sizeof(*port), GFP_KERNEL); + if (!port) + return ERR_PTR(-ENOMEM); + + rc = ida_alloc(&cxl_port_ida, GFP_KERNEL); + if (rc < 0) + goto err; + + port->id = rc; + port->target_id = target_id; + port->port_host = get_device(port_dev); + port->component_regs_phys = component_regs_phys; + + dev = &port->dev; + device_initialize(dev); + device_set_pm_not_required(dev); + dev->parent = &parent_port->dev; + dev->bus = &cxl_bus_type; + dev->type = &cxl_port_type; + + return port; + +err: + kfree(port); + return ERR_PTR(rc); +} + +/** + * devm_cxl_add_port() - add a cxl_port to the topology + * @host: devm context / discovery agent + * @parent_port: immediate ancestor towards cxl_root + * @port_host: PCI or platform-firmware device hosting this port + * @target_id: ordinal id relative to other siblings under @parent_port + * @component_regs_phys: CXL component register base address + */ +struct cxl_port *devm_cxl_add_port(struct device *host, + struct cxl_port *parent_port, + struct device *port_host, int target_id, + resource_size_t component_regs_phys) +{ + struct cxl_port *port; + struct device *dev; + int rc; + + port = cxl_port_alloc(parent_port, port_host, target_id, + component_regs_phys); + if (IS_ERR(port)) + return port; + + dev = &port->dev; + rc = dev_set_name(dev, "port%d", port->id); + if (rc) + goto err; + + rc = device_add(dev); + if (rc) + goto err; + + rc = devm_add_action_or_reset(host, unregister_dev, dev); + if (rc) + return ERR_PTR(rc); + + rc = devm_cxl_link_port(host, port); + if (rc) + return ERR_PTR(rc); + + return port; + +err: + put_device(dev); + return ERR_PTR(rc); +} +EXPORT_SYMBOL_GPL(devm_cxl_add_port); + /** * cxl_setup_device_regs() - Detect CXL Device register blocks * @dev: Host device of the @base mapping diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 5cd1173151e5..71a991bdacb7 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -134,5 +134,10 @@ struct cxl_address_space_dev *to_cxl_address_space(struct device *dev); struct cxl_root *devm_cxl_add_root(struct device *parent, struct cxl_address_space *cxl_space, int nr_spaces); +struct cxl_port *devm_cxl_add_port(struct device *host, + struct cxl_port *parent_port, + struct device *port_host, int target_id, + resource_size_t component_regs_phys); + extern struct bus_type cxl_bus_type; #endif /* __CXL_H__ */ From patchwork Fri May 7 22:52:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12245319 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,UNWANTED_LANGUAGE_BODY autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B1FCC433ED for ; Fri, 7 May 2021 22:52:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2515161354 for ; 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07 May 2021 15:52:04 -0700 Subject: [PATCH 8/8] cxl/acpi: Add module parameters to stand in for ACPI tables From: Dan Williams To: linux-cxl@vger.kernel.org Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Date: Fri, 07 May 2021 15:52:03 -0700 Message-ID: <162042792370.1202325.11876776878497740843.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> References: <162042787450.1202325.5718541949681409566.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org [debug / to-be-replaced / not-for-upstream] Given ACPICA support is needed before drivers can integrate ACPI functionality add some module parameters as proxies. --- drivers/cxl/acpi.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 79 insertions(+), 2 deletions(-) diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index bc2a35ae880b..2a48a728f3e0 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -4,10 +4,84 @@ #include #include #include +#include #include #include #include "cxl.h" +/* + * TODO: Replace all of the below module parameters with ACPI CXL + * resource descriptions once ACPICA makes them available. + */ +static unsigned long chbcr[4]; +module_param_named(chbcr0, chbcr[0], ulong, 0400); +module_param_named(chbcr1, chbcr[1], ulong, 0400); +module_param_named(chbcr2, chbcr[2], ulong, 0400); +module_param_named(chbcr3, chbcr[3], ulong, 0400); + +/* TODO: cross-bridge interleave */ +static struct cxl_address_space cxl_space[] = { + [0] = { .range = { 0, -1 }, .targets = 0x1, }, + [1] = { .range = { 0, -1 }, .targets = 0x1, }, + [2] = { .range = { 0, -1 }, .targets = 0x1, }, + [3] = { .range = { 0, -1 }, .targets = 0x1, }, +}; + +static int set_range(const char *val, const struct kernel_param *kp) +{ + unsigned long long size, base; + struct cxl_address_space *space; + unsigned long flags; + char *p; + int rc; + + size = memparse(val, &p); + if (*p != '@') + return -EINVAL; + + base = memparse(p + 1, &p); + if (*p != ':') + return -EINVAL; + + rc = kstrtoul(p + 1, 0, &flags); + if (rc) + return rc; + if (!flags || flags > CXL_ADDRSPACE_MASK) + return rc; + + space = kp->arg; + *space = (struct cxl_address_space) { + .range = { + .start = base, + .end = base + size - 1, + }, + .flags = flags, + }; + + return 0; +} + +static int get_range(char *buf, const struct kernel_param *kp) +{ + struct cxl_address_space *space = kp->arg; + + if (!range_len(&space->range)) + return -EINVAL; + + return sysfs_emit(buf, "%#llx@%#llx :%s%s%s%s\n", + (unsigned long long)range_len(&space->range), + (unsigned long long)space->range.start, + space->flags & CXL_ADDRSPACE_RAM ? " ram" : "", + space->flags & CXL_ADDRSPACE_PMEM ? " pmem" : "", + space->flags & CXL_ADDRSPACE_TYPE2 ? " type2" : "", + space->flags & CXL_ADDRSPACE_TYPE3 ? " type3" : ""); +} + +module_param_call(range0, set_range, get_range, &cxl_space[0], 0400); +module_param_call(range1, set_range, get_range, &cxl_space[1], 0400); +module_param_call(range2, set_range, get_range, &cxl_space[2], 0400); +module_param_call(range3, set_range, get_range, &cxl_space[3], 0400); + static int match_ACPI0016(struct device *dev, const void *host) { struct acpi_device *adev = to_acpi_device(dev); @@ -67,13 +141,16 @@ static int cxl_acpi_register_ports(struct device *dev, struct acpi_device *root, struct cxl_port *port, int idx) { struct acpi_pci_root *pci_root = acpi_pci_find_root(root->handle); + resource_size_t chbcr_base = ~0ULL; struct cxl_walk_context ctx; if (!pci_root) return -ENXIO; /* TODO: fold in CEDT.CHBS retrieval */ - port = devm_cxl_add_port(dev, port, &root->dev, idx, ~0ULL); + if (idx < ARRAY_SIZE(chbcr)) + chbcr_base = chbcr[idx]; + port = devm_cxl_add_port(dev, port, &root->dev, idx, chbcr_base); if (IS_ERR(port)) return PTR_ERR(port); dev_dbg(dev, "%s: register: %s\n", dev_name(&root->dev), @@ -99,7 +176,7 @@ static int cxl_acpi_probe(struct platform_device *pdev) struct cxl_root *cxl_root; int rc, i = 0; - cxl_root = devm_cxl_add_root(dev, NULL, 0); + cxl_root = devm_cxl_add_root(dev, cxl_space, ARRAY_SIZE(cxl_space)); if (IS_ERR(cxl_root)) return PTR_ERR(cxl_root); dev_dbg(dev, "register: %s\n", dev_name(&cxl_root->port.dev));