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851 lines
23 KiB
C
851 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright(c) 2020 Intel Corporation. All rights reserved. */
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#include <linux/io-64-nonatomic-lo-hi.h>
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#include <linux/moduleparam.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/sizes.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <linux/pci.h>
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#include <linux/pci-doe.h>
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#include <linux/aer.h>
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#include <linux/io.h>
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#include "cxlmem.h"
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#include "cxlpci.h"
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#include "cxl.h"
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/**
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* DOC: cxl pci
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*
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* This implements the PCI exclusive functionality for a CXL device as it is
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* defined by the Compute Express Link specification. CXL devices may surface
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* certain functionality even if it isn't CXL enabled. While this driver is
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* focused around the PCI specific aspects of a CXL device, it binds to the
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* specific CXL memory device class code, and therefore the implementation of
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* cxl_pci is focused around CXL memory devices.
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*
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* The driver has several responsibilities, mainly:
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* - Create the memX device and register on the CXL bus.
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* - Enumerate device's register interface and map them.
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* - Registers nvdimm bridge device with cxl_core.
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* - Registers a CXL mailbox with cxl_core.
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*/
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#define cxl_doorbell_busy(cxlds) \
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(readl((cxlds)->regs.mbox + CXLDEV_MBOX_CTRL_OFFSET) & \
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CXLDEV_MBOX_CTRL_DOORBELL)
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/* CXL 2.0 - 8.2.8.4 */
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#define CXL_MAILBOX_TIMEOUT_MS (2 * HZ)
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/*
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* CXL 2.0 ECN "Add Mailbox Ready Time" defines a capability field to
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* dictate how long to wait for the mailbox to become ready. The new
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* field allows the device to tell software the amount of time to wait
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* before mailbox ready. This field per the spec theoretically allows
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* for up to 255 seconds. 255 seconds is unreasonably long, its longer
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* than the maximum SATA port link recovery wait. Default to 60 seconds
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* until someone builds a CXL device that needs more time in practice.
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*/
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static unsigned short mbox_ready_timeout = 60;
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module_param(mbox_ready_timeout, ushort, 0644);
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MODULE_PARM_DESC(mbox_ready_timeout, "seconds to wait for mailbox ready");
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static int cxl_pci_mbox_wait_for_doorbell(struct cxl_dev_state *cxlds)
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{
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const unsigned long start = jiffies;
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unsigned long end = start;
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while (cxl_doorbell_busy(cxlds)) {
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end = jiffies;
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if (time_after(end, start + CXL_MAILBOX_TIMEOUT_MS)) {
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/* Check again in case preempted before timeout test */
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if (!cxl_doorbell_busy(cxlds))
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break;
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return -ETIMEDOUT;
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}
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cpu_relax();
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}
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dev_dbg(cxlds->dev, "Doorbell wait took %dms",
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jiffies_to_msecs(end) - jiffies_to_msecs(start));
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return 0;
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}
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#define cxl_err(dev, status, msg) \
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dev_err_ratelimited(dev, msg ", device state %s%s\n", \
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status & CXLMDEV_DEV_FATAL ? " fatal" : "", \
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status & CXLMDEV_FW_HALT ? " firmware-halt" : "")
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#define cxl_cmd_err(dev, cmd, status, msg) \
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dev_err_ratelimited(dev, msg " (opcode: %#x), device state %s%s\n", \
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(cmd)->opcode, \
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status & CXLMDEV_DEV_FATAL ? " fatal" : "", \
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status & CXLMDEV_FW_HALT ? " firmware-halt" : "")
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/**
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* __cxl_pci_mbox_send_cmd() - Execute a mailbox command
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* @cxlds: The device state to communicate with.
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* @mbox_cmd: Command to send to the memory device.
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*
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* Context: Any context. Expects mbox_mutex to be held.
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* Return: -ETIMEDOUT if timeout occurred waiting for completion. 0 on success.
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* Caller should check the return code in @mbox_cmd to make sure it
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* succeeded.
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*
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* This is a generic form of the CXL mailbox send command thus only using the
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* registers defined by the mailbox capability ID - CXL 2.0 8.2.8.4. Memory
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* devices, and perhaps other types of CXL devices may have further information
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* available upon error conditions. Driver facilities wishing to send mailbox
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* commands should use the wrapper command.
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*
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* The CXL spec allows for up to two mailboxes. The intention is for the primary
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* mailbox to be OS controlled and the secondary mailbox to be used by system
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* firmware. This allows the OS and firmware to communicate with the device and
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* not need to coordinate with each other. The driver only uses the primary
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* mailbox.
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*/
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static int __cxl_pci_mbox_send_cmd(struct cxl_dev_state *cxlds,
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struct cxl_mbox_cmd *mbox_cmd)
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{
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void __iomem *payload = cxlds->regs.mbox + CXLDEV_MBOX_PAYLOAD_OFFSET;
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struct device *dev = cxlds->dev;
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u64 cmd_reg, status_reg;
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size_t out_len;
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int rc;
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lockdep_assert_held(&cxlds->mbox_mutex);
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/*
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* Here are the steps from 8.2.8.4 of the CXL 2.0 spec.
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* 1. Caller reads MB Control Register to verify doorbell is clear
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* 2. Caller writes Command Register
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* 3. Caller writes Command Payload Registers if input payload is non-empty
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* 4. Caller writes MB Control Register to set doorbell
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* 5. Caller either polls for doorbell to be clear or waits for interrupt if configured
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* 6. Caller reads MB Status Register to fetch Return code
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* 7. If command successful, Caller reads Command Register to get Payload Length
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* 8. If output payload is non-empty, host reads Command Payload Registers
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*
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* Hardware is free to do whatever it wants before the doorbell is rung,
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* and isn't allowed to change anything after it clears the doorbell. As
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* such, steps 2 and 3 can happen in any order, and steps 6, 7, 8 can
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* also happen in any order (though some orders might not make sense).
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*/
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/* #1 */
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if (cxl_doorbell_busy(cxlds)) {
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u64 md_status =
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readq(cxlds->regs.memdev + CXLMDEV_STATUS_OFFSET);
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cxl_cmd_err(cxlds->dev, mbox_cmd, md_status,
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"mailbox queue busy");
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return -EBUSY;
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}
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cmd_reg = FIELD_PREP(CXLDEV_MBOX_CMD_COMMAND_OPCODE_MASK,
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mbox_cmd->opcode);
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if (mbox_cmd->size_in) {
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if (WARN_ON(!mbox_cmd->payload_in))
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return -EINVAL;
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cmd_reg |= FIELD_PREP(CXLDEV_MBOX_CMD_PAYLOAD_LENGTH_MASK,
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mbox_cmd->size_in);
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memcpy_toio(payload, mbox_cmd->payload_in, mbox_cmd->size_in);
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}
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/* #2, #3 */
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writeq(cmd_reg, cxlds->regs.mbox + CXLDEV_MBOX_CMD_OFFSET);
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/* #4 */
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dev_dbg(dev, "Sending command: 0x%04x\n", mbox_cmd->opcode);
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writel(CXLDEV_MBOX_CTRL_DOORBELL,
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cxlds->regs.mbox + CXLDEV_MBOX_CTRL_OFFSET);
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/* #5 */
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rc = cxl_pci_mbox_wait_for_doorbell(cxlds);
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if (rc == -ETIMEDOUT) {
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u64 md_status = readq(cxlds->regs.memdev + CXLMDEV_STATUS_OFFSET);
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cxl_cmd_err(cxlds->dev, mbox_cmd, md_status, "mailbox timeout");
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return rc;
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}
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/* #6 */
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status_reg = readq(cxlds->regs.mbox + CXLDEV_MBOX_STATUS_OFFSET);
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mbox_cmd->return_code =
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FIELD_GET(CXLDEV_MBOX_STATUS_RET_CODE_MASK, status_reg);
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if (mbox_cmd->return_code != CXL_MBOX_CMD_RC_SUCCESS) {
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dev_dbg(dev, "Mailbox operation had an error: %s\n",
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cxl_mbox_cmd_rc2str(mbox_cmd));
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return 0; /* completed but caller must check return_code */
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}
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/* #7 */
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cmd_reg = readq(cxlds->regs.mbox + CXLDEV_MBOX_CMD_OFFSET);
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out_len = FIELD_GET(CXLDEV_MBOX_CMD_PAYLOAD_LENGTH_MASK, cmd_reg);
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/* #8 */
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if (out_len && mbox_cmd->payload_out) {
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/*
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* Sanitize the copy. If hardware misbehaves, out_len per the
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* spec can actually be greater than the max allowed size (21
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* bits available but spec defined 1M max). The caller also may
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* have requested less data than the hardware supplied even
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* within spec.
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*/
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size_t n = min3(mbox_cmd->size_out, cxlds->payload_size, out_len);
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memcpy_fromio(mbox_cmd->payload_out, payload, n);
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mbox_cmd->size_out = n;
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} else {
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mbox_cmd->size_out = 0;
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}
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return 0;
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}
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static int cxl_pci_mbox_send(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
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{
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int rc;
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mutex_lock_io(&cxlds->mbox_mutex);
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rc = __cxl_pci_mbox_send_cmd(cxlds, cmd);
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mutex_unlock(&cxlds->mbox_mutex);
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return rc;
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}
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static int cxl_pci_setup_mailbox(struct cxl_dev_state *cxlds)
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{
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const int cap = readl(cxlds->regs.mbox + CXLDEV_MBOX_CAPS_OFFSET);
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unsigned long timeout;
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u64 md_status;
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timeout = jiffies + mbox_ready_timeout * HZ;
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do {
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md_status = readq(cxlds->regs.memdev + CXLMDEV_STATUS_OFFSET);
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if (md_status & CXLMDEV_MBOX_IF_READY)
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break;
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if (msleep_interruptible(100))
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break;
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} while (!time_after(jiffies, timeout));
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if (!(md_status & CXLMDEV_MBOX_IF_READY)) {
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cxl_err(cxlds->dev, md_status,
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"timeout awaiting mailbox ready");
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return -ETIMEDOUT;
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}
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/*
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* A command may be in flight from a previous driver instance,
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* think kexec, do one doorbell wait so that
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* __cxl_pci_mbox_send_cmd() can assume that it is the only
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* source for future doorbell busy events.
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*/
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if (cxl_pci_mbox_wait_for_doorbell(cxlds) != 0) {
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cxl_err(cxlds->dev, md_status, "timeout awaiting mailbox idle");
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return -ETIMEDOUT;
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}
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cxlds->mbox_send = cxl_pci_mbox_send;
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cxlds->payload_size =
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1 << FIELD_GET(CXLDEV_MBOX_CAP_PAYLOAD_SIZE_MASK, cap);
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/*
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* CXL 2.0 8.2.8.4.3 Mailbox Capabilities Register
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*
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* If the size is too small, mandatory commands will not work and so
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* there's no point in going forward. If the size is too large, there's
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* no harm is soft limiting it.
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*/
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cxlds->payload_size = min_t(size_t, cxlds->payload_size, SZ_1M);
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if (cxlds->payload_size < 256) {
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dev_err(cxlds->dev, "Mailbox is too small (%zub)",
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cxlds->payload_size);
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return -ENXIO;
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}
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dev_dbg(cxlds->dev, "Mailbox payload sized %zu",
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cxlds->payload_size);
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return 0;
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}
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static int cxl_map_regblock(struct pci_dev *pdev, struct cxl_register_map *map)
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{
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struct device *dev = &pdev->dev;
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map->base = ioremap(map->resource, map->max_size);
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if (!map->base) {
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dev_err(dev, "failed to map registers\n");
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return -ENOMEM;
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}
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dev_dbg(dev, "Mapped CXL Memory Device resource %pa\n", &map->resource);
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return 0;
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}
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static void cxl_unmap_regblock(struct pci_dev *pdev,
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struct cxl_register_map *map)
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{
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iounmap(map->base);
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map->base = NULL;
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}
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static int cxl_probe_regs(struct pci_dev *pdev, struct cxl_register_map *map)
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{
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struct cxl_component_reg_map *comp_map;
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struct cxl_device_reg_map *dev_map;
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struct device *dev = &pdev->dev;
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void __iomem *base = map->base;
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switch (map->reg_type) {
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case CXL_REGLOC_RBI_COMPONENT:
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comp_map = &map->component_map;
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cxl_probe_component_regs(dev, base, comp_map);
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if (!comp_map->hdm_decoder.valid) {
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dev_err(dev, "HDM decoder registers not found\n");
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return -ENXIO;
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}
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if (!comp_map->ras.valid)
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dev_dbg(dev, "RAS registers not found\n");
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dev_dbg(dev, "Set up component registers\n");
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break;
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case CXL_REGLOC_RBI_MEMDEV:
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dev_map = &map->device_map;
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cxl_probe_device_regs(dev, base, dev_map);
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if (!dev_map->status.valid || !dev_map->mbox.valid ||
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!dev_map->memdev.valid) {
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dev_err(dev, "registers not found: %s%s%s\n",
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!dev_map->status.valid ? "status " : "",
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!dev_map->mbox.valid ? "mbox " : "",
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!dev_map->memdev.valid ? "memdev " : "");
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return -ENXIO;
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}
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dev_dbg(dev, "Probing device registers...\n");
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break;
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default:
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break;
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}
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return 0;
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}
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static int cxl_setup_regs(struct pci_dev *pdev, enum cxl_regloc_type type,
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struct cxl_register_map *map)
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{
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int rc;
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rc = cxl_find_regblock(pdev, type, map);
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if (rc)
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return rc;
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rc = cxl_map_regblock(pdev, map);
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if (rc)
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return rc;
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rc = cxl_probe_regs(pdev, map);
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cxl_unmap_regblock(pdev, map);
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return rc;
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}
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static void cxl_pci_destroy_doe(void *mbs)
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{
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xa_destroy(mbs);
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}
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static void devm_cxl_pci_create_doe(struct cxl_dev_state *cxlds)
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{
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struct device *dev = cxlds->dev;
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struct pci_dev *pdev = to_pci_dev(dev);
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u16 off = 0;
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xa_init(&cxlds->doe_mbs);
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if (devm_add_action(&pdev->dev, cxl_pci_destroy_doe, &cxlds->doe_mbs)) {
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dev_err(dev, "Failed to create XArray for DOE's\n");
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return;
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}
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/*
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* Mailbox creation is best effort. Higher layers must determine if
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* the lack of a mailbox for their protocol is a device failure or not.
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*/
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pci_doe_for_each_off(pdev, off) {
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struct pci_doe_mb *doe_mb;
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doe_mb = pcim_doe_create_mb(pdev, off);
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if (IS_ERR(doe_mb)) {
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dev_err(dev, "Failed to create MB object for MB @ %x\n",
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off);
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continue;
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}
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if (!pci_request_config_region_exclusive(pdev, off,
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PCI_DOE_CAP_SIZEOF,
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dev_name(dev)))
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pci_err(pdev, "Failed to exclude DOE registers\n");
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if (xa_insert(&cxlds->doe_mbs, off, doe_mb, GFP_KERNEL)) {
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dev_err(dev, "xa_insert failed to insert MB @ %x\n",
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off);
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continue;
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}
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dev_dbg(dev, "Created DOE mailbox @%x\n", off);
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}
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}
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/*
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* Assume that any RCIEP that emits the CXL memory expander class code
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* is an RCD
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*/
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static bool is_cxl_restricted(struct pci_dev *pdev)
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{
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return pci_pcie_type(pdev) == PCI_EXP_TYPE_RC_END;
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}
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/*
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* CXL v3.0 6.2.3 Table 6-4
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* The table indicates that if PCIe Flit Mode is set, then CXL is in 256B flits
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* mode, otherwise it's 68B flits mode.
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*/
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static bool cxl_pci_flit_256(struct pci_dev *pdev)
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{
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u16 lnksta2;
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pcie_capability_read_word(pdev, PCI_EXP_LNKSTA2, &lnksta2);
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return lnksta2 & PCI_EXP_LNKSTA2_FLIT;
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}
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static int cxl_pci_ras_unmask(struct pci_dev *pdev)
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{
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struct pci_host_bridge *host_bridge = pci_find_host_bridge(pdev->bus);
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struct cxl_dev_state *cxlds = pci_get_drvdata(pdev);
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void __iomem *addr;
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u32 orig_val, val, mask;
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u16 cap;
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int rc;
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if (!cxlds->regs.ras) {
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dev_dbg(&pdev->dev, "No RAS registers.\n");
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return 0;
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}
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/* BIOS has CXL error control */
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if (!host_bridge->native_cxl_error)
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return -ENXIO;
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rc = pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &cap);
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if (rc)
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return rc;
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if (cap & PCI_EXP_DEVCTL_URRE) {
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addr = cxlds->regs.ras + CXL_RAS_UNCORRECTABLE_MASK_OFFSET;
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orig_val = readl(addr);
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mask = CXL_RAS_UNCORRECTABLE_MASK_MASK;
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if (!cxl_pci_flit_256(pdev))
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mask &= ~CXL_RAS_UNCORRECTABLE_MASK_F256B_MASK;
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val = orig_val & ~mask;
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writel(val, addr);
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dev_dbg(&pdev->dev,
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"Uncorrectable RAS Errors Mask: %#x -> %#x\n",
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orig_val, val);
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}
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if (cap & PCI_EXP_DEVCTL_CERE) {
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addr = cxlds->regs.ras + CXL_RAS_CORRECTABLE_MASK_OFFSET;
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orig_val = readl(addr);
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val = orig_val & ~CXL_RAS_CORRECTABLE_MASK_MASK;
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|
writel(val, addr);
|
|
dev_dbg(&pdev->dev, "Correctable RAS Errors Mask: %#x -> %#x\n",
|
|
orig_val, val);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void free_event_buf(void *buf)
|
|
{
|
|
kvfree(buf);
|
|
}
|
|
|
|
/*
|
|
* There is a single buffer for reading event logs from the mailbox. All logs
|
|
* share this buffer protected by the cxlds->event_log_lock.
|
|
*/
|
|
static int cxl_mem_alloc_event_buf(struct cxl_dev_state *cxlds)
|
|
{
|
|
struct cxl_get_event_payload *buf;
|
|
|
|
buf = kvmalloc(cxlds->payload_size, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
cxlds->event.buf = buf;
|
|
|
|
return devm_add_action_or_reset(cxlds->dev, free_event_buf, buf);
|
|
}
|
|
|
|
static int cxl_alloc_irq_vectors(struct pci_dev *pdev)
|
|
{
|
|
int nvecs;
|
|
|
|
/*
|
|
* Per CXL 3.0 3.1.1 CXL.io Endpoint a function on a CXL device must
|
|
* not generate INTx messages if that function participates in
|
|
* CXL.cache or CXL.mem.
|
|
*
|
|
* Additionally pci_alloc_irq_vectors() handles calling
|
|
* pci_free_irq_vectors() automatically despite not being called
|
|
* pcim_*. See pci_setup_msi_context().
|
|
*/
|
|
nvecs = pci_alloc_irq_vectors(pdev, 1, CXL_PCI_DEFAULT_MAX_VECTORS,
|
|
PCI_IRQ_MSIX | PCI_IRQ_MSI);
|
|
if (nvecs < 1) {
|
|
dev_dbg(&pdev->dev, "Failed to alloc irq vectors: %d\n", nvecs);
|
|
return -ENXIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct cxl_dev_id {
|
|
struct cxl_dev_state *cxlds;
|
|
};
|
|
|
|
static irqreturn_t cxl_event_thread(int irq, void *id)
|
|
{
|
|
struct cxl_dev_id *dev_id = id;
|
|
struct cxl_dev_state *cxlds = dev_id->cxlds;
|
|
u32 status;
|
|
|
|
do {
|
|
/*
|
|
* CXL 3.0 8.2.8.3.1: The lower 32 bits are the status;
|
|
* ignore the reserved upper 32 bits
|
|
*/
|
|
status = readl(cxlds->regs.status + CXLDEV_DEV_EVENT_STATUS_OFFSET);
|
|
/* Ignore logs unknown to the driver */
|
|
status &= CXLDEV_EVENT_STATUS_ALL;
|
|
if (!status)
|
|
break;
|
|
cxl_mem_get_event_records(cxlds, status);
|
|
cond_resched();
|
|
} while (status);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int cxl_event_req_irq(struct cxl_dev_state *cxlds, u8 setting)
|
|
{
|
|
struct device *dev = cxlds->dev;
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
struct cxl_dev_id *dev_id;
|
|
int irq;
|
|
|
|
if (FIELD_GET(CXLDEV_EVENT_INT_MODE_MASK, setting) != CXL_INT_MSI_MSIX)
|
|
return -ENXIO;
|
|
|
|
/* dev_id must be globally unique and must contain the cxlds */
|
|
dev_id = devm_kzalloc(dev, sizeof(*dev_id), GFP_KERNEL);
|
|
if (!dev_id)
|
|
return -ENOMEM;
|
|
dev_id->cxlds = cxlds;
|
|
|
|
irq = pci_irq_vector(pdev,
|
|
FIELD_GET(CXLDEV_EVENT_INT_MSGNUM_MASK, setting));
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
return devm_request_threaded_irq(dev, irq, NULL, cxl_event_thread,
|
|
IRQF_SHARED | IRQF_ONESHOT, NULL,
|
|
dev_id);
|
|
}
|
|
|
|
static int cxl_event_get_int_policy(struct cxl_dev_state *cxlds,
|
|
struct cxl_event_interrupt_policy *policy)
|
|
{
|
|
struct cxl_mbox_cmd mbox_cmd = {
|
|
.opcode = CXL_MBOX_OP_GET_EVT_INT_POLICY,
|
|
.payload_out = policy,
|
|
.size_out = sizeof(*policy),
|
|
};
|
|
int rc;
|
|
|
|
rc = cxl_internal_send_cmd(cxlds, &mbox_cmd);
|
|
if (rc < 0)
|
|
dev_err(cxlds->dev, "Failed to get event interrupt policy : %d",
|
|
rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int cxl_event_config_msgnums(struct cxl_dev_state *cxlds,
|
|
struct cxl_event_interrupt_policy *policy)
|
|
{
|
|
struct cxl_mbox_cmd mbox_cmd;
|
|
int rc;
|
|
|
|
*policy = (struct cxl_event_interrupt_policy) {
|
|
.info_settings = CXL_INT_MSI_MSIX,
|
|
.warn_settings = CXL_INT_MSI_MSIX,
|
|
.failure_settings = CXL_INT_MSI_MSIX,
|
|
.fatal_settings = CXL_INT_MSI_MSIX,
|
|
};
|
|
|
|
mbox_cmd = (struct cxl_mbox_cmd) {
|
|
.opcode = CXL_MBOX_OP_SET_EVT_INT_POLICY,
|
|
.payload_in = policy,
|
|
.size_in = sizeof(*policy),
|
|
};
|
|
|
|
rc = cxl_internal_send_cmd(cxlds, &mbox_cmd);
|
|
if (rc < 0) {
|
|
dev_err(cxlds->dev, "Failed to set event interrupt policy : %d",
|
|
rc);
|
|
return rc;
|
|
}
|
|
|
|
/* Retrieve final interrupt settings */
|
|
return cxl_event_get_int_policy(cxlds, policy);
|
|
}
|
|
|
|
static int cxl_event_irqsetup(struct cxl_dev_state *cxlds)
|
|
{
|
|
struct cxl_event_interrupt_policy policy;
|
|
int rc;
|
|
|
|
rc = cxl_event_config_msgnums(cxlds, &policy);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = cxl_event_req_irq(cxlds, policy.info_settings);
|
|
if (rc) {
|
|
dev_err(cxlds->dev, "Failed to get interrupt for event Info log\n");
|
|
return rc;
|
|
}
|
|
|
|
rc = cxl_event_req_irq(cxlds, policy.warn_settings);
|
|
if (rc) {
|
|
dev_err(cxlds->dev, "Failed to get interrupt for event Warn log\n");
|
|
return rc;
|
|
}
|
|
|
|
rc = cxl_event_req_irq(cxlds, policy.failure_settings);
|
|
if (rc) {
|
|
dev_err(cxlds->dev, "Failed to get interrupt for event Failure log\n");
|
|
return rc;
|
|
}
|
|
|
|
rc = cxl_event_req_irq(cxlds, policy.fatal_settings);
|
|
if (rc) {
|
|
dev_err(cxlds->dev, "Failed to get interrupt for event Fatal log\n");
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool cxl_event_int_is_fw(u8 setting)
|
|
{
|
|
u8 mode = FIELD_GET(CXLDEV_EVENT_INT_MODE_MASK, setting);
|
|
|
|
return mode == CXL_INT_FW;
|
|
}
|
|
|
|
static int cxl_event_config(struct pci_host_bridge *host_bridge,
|
|
struct cxl_dev_state *cxlds)
|
|
{
|
|
struct cxl_event_interrupt_policy policy;
|
|
int rc;
|
|
|
|
/*
|
|
* When BIOS maintains CXL error reporting control, it will process
|
|
* event records. Only one agent can do so.
|
|
*/
|
|
if (!host_bridge->native_cxl_error)
|
|
return 0;
|
|
|
|
rc = cxl_mem_alloc_event_buf(cxlds);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = cxl_event_get_int_policy(cxlds, &policy);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (cxl_event_int_is_fw(policy.info_settings) ||
|
|
cxl_event_int_is_fw(policy.warn_settings) ||
|
|
cxl_event_int_is_fw(policy.failure_settings) ||
|
|
cxl_event_int_is_fw(policy.fatal_settings)) {
|
|
dev_err(cxlds->dev, "FW still in control of Event Logs despite _OSC settings\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
rc = cxl_event_irqsetup(cxlds);
|
|
if (rc)
|
|
return rc;
|
|
|
|
cxl_mem_get_event_records(cxlds, CXLDEV_EVENT_STATUS_ALL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
|
|
{
|
|
struct pci_host_bridge *host_bridge = pci_find_host_bridge(pdev->bus);
|
|
struct cxl_register_map map;
|
|
struct cxl_memdev *cxlmd;
|
|
struct cxl_dev_state *cxlds;
|
|
int rc;
|
|
|
|
/*
|
|
* Double check the anonymous union trickery in struct cxl_regs
|
|
* FIXME switch to struct_group()
|
|
*/
|
|
BUILD_BUG_ON(offsetof(struct cxl_regs, memdev) !=
|
|
offsetof(struct cxl_regs, device_regs.memdev));
|
|
|
|
rc = pcim_enable_device(pdev);
|
|
if (rc)
|
|
return rc;
|
|
pci_set_master(pdev);
|
|
|
|
cxlds = cxl_dev_state_create(&pdev->dev);
|
|
if (IS_ERR(cxlds))
|
|
return PTR_ERR(cxlds);
|
|
pci_set_drvdata(pdev, cxlds);
|
|
|
|
cxlds->rcd = is_cxl_restricted(pdev);
|
|
cxlds->serial = pci_get_dsn(pdev);
|
|
cxlds->cxl_dvsec = pci_find_dvsec_capability(
|
|
pdev, PCI_DVSEC_VENDOR_ID_CXL, CXL_DVSEC_PCIE_DEVICE);
|
|
if (!cxlds->cxl_dvsec)
|
|
dev_warn(&pdev->dev,
|
|
"Device DVSEC not present, skip CXL.mem init\n");
|
|
|
|
rc = cxl_setup_regs(pdev, CXL_REGLOC_RBI_MEMDEV, &map);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = cxl_map_device_regs(&pdev->dev, &cxlds->regs.device_regs, &map);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/*
|
|
* If the component registers can't be found, the cxl_pci driver may
|
|
* still be useful for management functions so don't return an error.
|
|
*/
|
|
cxlds->component_reg_phys = CXL_RESOURCE_NONE;
|
|
rc = cxl_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT, &map);
|
|
if (rc)
|
|
dev_warn(&pdev->dev, "No component registers (%d)\n", rc);
|
|
|
|
cxlds->component_reg_phys = map.resource;
|
|
|
|
devm_cxl_pci_create_doe(cxlds);
|
|
|
|
rc = cxl_map_component_regs(&pdev->dev, &cxlds->regs.component,
|
|
&map, BIT(CXL_CM_CAP_CAP_ID_RAS));
|
|
if (rc)
|
|
dev_dbg(&pdev->dev, "Failed to map RAS capability.\n");
|
|
|
|
rc = cxl_pci_setup_mailbox(cxlds);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = cxl_enumerate_cmds(cxlds);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = cxl_set_timestamp(cxlds);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = cxl_dev_state_identify(cxlds);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = cxl_mem_create_range_info(cxlds);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = cxl_alloc_irq_vectors(pdev);
|
|
if (rc)
|
|
return rc;
|
|
|
|
cxlmd = devm_cxl_add_memdev(cxlds);
|
|
if (IS_ERR(cxlmd))
|
|
return PTR_ERR(cxlmd);
|
|
|
|
rc = cxl_event_config(host_bridge, cxlds);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = cxl_pci_ras_unmask(pdev);
|
|
if (rc)
|
|
dev_dbg(&pdev->dev, "No RAS reporting unmasked\n");
|
|
|
|
pci_save_state(pdev);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static const struct pci_device_id cxl_mem_pci_tbl[] = {
|
|
/* PCI class code for CXL.mem Type-3 Devices */
|
|
{ PCI_DEVICE_CLASS((PCI_CLASS_MEMORY_CXL << 8 | CXL_MEMORY_PROGIF), ~0)},
|
|
{ /* terminate list */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, cxl_mem_pci_tbl);
|
|
|
|
static pci_ers_result_t cxl_slot_reset(struct pci_dev *pdev)
|
|
{
|
|
struct cxl_dev_state *cxlds = pci_get_drvdata(pdev);
|
|
struct cxl_memdev *cxlmd = cxlds->cxlmd;
|
|
struct device *dev = &cxlmd->dev;
|
|
|
|
dev_info(&pdev->dev, "%s: restart CXL.mem after slot reset\n",
|
|
dev_name(dev));
|
|
pci_restore_state(pdev);
|
|
if (device_attach(dev) <= 0)
|
|
return PCI_ERS_RESULT_DISCONNECT;
|
|
return PCI_ERS_RESULT_RECOVERED;
|
|
}
|
|
|
|
static void cxl_error_resume(struct pci_dev *pdev)
|
|
{
|
|
struct cxl_dev_state *cxlds = pci_get_drvdata(pdev);
|
|
struct cxl_memdev *cxlmd = cxlds->cxlmd;
|
|
struct device *dev = &cxlmd->dev;
|
|
|
|
dev_info(&pdev->dev, "%s: error resume %s\n", dev_name(dev),
|
|
dev->driver ? "successful" : "failed");
|
|
}
|
|
|
|
static const struct pci_error_handlers cxl_error_handlers = {
|
|
.error_detected = cxl_error_detected,
|
|
.slot_reset = cxl_slot_reset,
|
|
.resume = cxl_error_resume,
|
|
.cor_error_detected = cxl_cor_error_detected,
|
|
};
|
|
|
|
static struct pci_driver cxl_pci_driver = {
|
|
.name = KBUILD_MODNAME,
|
|
.id_table = cxl_mem_pci_tbl,
|
|
.probe = cxl_pci_probe,
|
|
.err_handler = &cxl_error_handlers,
|
|
.driver = {
|
|
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
|
|
},
|
|
};
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
module_pci_driver(cxl_pci_driver);
|
|
MODULE_IMPORT_NS(CXL);
|