diff options
| author | Alison Schofield <alison.schofield@intel.com> | 2023-04-18 20:26:25 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2023-04-23 11:46:22 -0700 |
| commit | d2fbc48658022f48625064ae192baff52057987d (patch) | |
| tree | 8041a3b0cb6bd212f303d0d79b3991a1e3eddcb6 /drivers/cxl/core/memdev.c | |
| parent | f8d22bf50ca56a334ef58bf59ee299ed62940e42 (diff) | |
| download | lwn-d2fbc48658022f48625064ae192baff52057987d.tar.gz lwn-d2fbc48658022f48625064ae192baff52057987d.zip | |
cxl/memdev: Add support for the Inject Poison mailbox command
CXL devices optionally support the INJECT POISON mailbox command. Add
memdev driver support for the mailbox command.
Per the CXL Specification (3.0 8.2.9.8.4.2), after receiving a valid
inject poison request, the device will return poison when the address
is accessed through the CXL.mem driver. Injecting poison adds the address
to the device's Poison List and the error source is set to Injected.
In addition, the device adds a poison creation event to its internal
Informational Event log, updates the Event Status register, and if
configured, interrupts the host.
Also, per the CXL Specification, it is not an error to inject poison
into an address that already has poison present and no error is
returned from the device.
If the address is not contained in the device's dpa resource, or is
not 64 byte aligned, return -EINVAL without issuing the mbox command.
Poison injection is intended for debug only and will be exposed to
userspace through debugfs. Restrict compilation to CONFIG_DEBUG_FS.
Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/241c64115e6bd2effed9c7a20b08b3908dd7be8f.1681874357.git.alison.schofield@intel.com
Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/core/memdev.c')
| -rw-r--r-- | drivers/cxl/core/memdev.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c index 185b6d27b698..8a3b7d7505fe 100644 --- a/drivers/cxl/core/memdev.c +++ b/drivers/cxl/core/memdev.c @@ -160,6 +160,62 @@ int cxl_trigger_poison_list(struct cxl_memdev *cxlmd) } EXPORT_SYMBOL_NS_GPL(cxl_trigger_poison_list, CXL); +static int cxl_validate_poison_dpa(struct cxl_memdev *cxlmd, u64 dpa) +{ + struct cxl_dev_state *cxlds = cxlmd->cxlds; + + if (!IS_ENABLED(CONFIG_DEBUG_FS)) + return 0; + + if (!resource_size(&cxlds->dpa_res)) { + dev_dbg(cxlds->dev, "device has no dpa resource\n"); + return -EINVAL; + } + if (dpa < cxlds->dpa_res.start || dpa > cxlds->dpa_res.end) { + dev_dbg(cxlds->dev, "dpa:0x%llx not in resource:%pR\n", + dpa, &cxlds->dpa_res); + return -EINVAL; + } + if (!IS_ALIGNED(dpa, 64)) { + dev_dbg(cxlds->dev, "dpa:0x%llx is not 64-byte aligned\n", dpa); + return -EINVAL; + } + + return 0; +} + +int cxl_inject_poison(struct cxl_memdev *cxlmd, u64 dpa) +{ + struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct cxl_mbox_inject_poison inject; + struct cxl_mbox_cmd mbox_cmd; + int rc; + + if (!IS_ENABLED(CONFIG_DEBUG_FS)) + return 0; + + rc = down_read_interruptible(&cxl_dpa_rwsem); + if (rc) + return rc; + + rc = cxl_validate_poison_dpa(cxlmd, dpa); + if (rc) + goto out; + + inject.address = cpu_to_le64(dpa); + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_INJECT_POISON, + .size_in = sizeof(inject), + .payload_in = &inject, + }; + rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); +out: + up_read(&cxl_dpa_rwsem); + + return rc; +} +EXPORT_SYMBOL_NS_GPL(cxl_inject_poison, CXL); + static struct attribute *cxl_memdev_attributes[] = { &dev_attr_serial.attr, &dev_attr_firmware_version.attr, |