diff options
| author | Alison Schofield <alison.schofield@intel.com> | 2022-03-31 04:27:18 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-04-13 02:07:01 +0300 |
| commit | 6179045ccc0c6229dc449afc1701dc7fbd40571f (patch) | |
| tree | 06c502f75d0926a83ccf63dbe5e8415c8bb588dc /drivers/cxl/cxlmem.h | |
| parent | 2dd5600a0e4e1aca8541e1c5bb2bc26bc0441d4d (diff) | |
| download | linux-6179045ccc0c6229dc449afc1701dc7fbd40571f.tar.xz | |
cxl/mbox: Block immediate mode in SET_PARTITION_INFO command
User space may send the SET_PARTITION_INFO mailbox command using
the IOCTL interface. Inspect the input payload and fail if the
immediate flag is set.
This is the first instance of the driver inspecting an input payload
from user space. Assume there will be more such cases and implement
with an extensible helper.
In order for the kernel to react to an immediate partition change it
needs to assert that the change will not affect any active decode. At
a minimum this requires validating that the device is using HDM
decoders instead of the CXL DVSEC for decode, and that none of the
active HDM decoders are affected by the partition change. For now,
just fail until that support arrives.
Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/241821186c363833980adbc389e2c547bc5a6395.1648687552.git.alison.schofield@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/cxlmem.h')
| -rw-r--r-- | drivers/cxl/cxlmem.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index 5d33ce24fe09..df8dad028e43 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -262,6 +262,13 @@ struct cxl_mbox_set_lsa { u8 data[]; } __packed; +struct cxl_mbox_set_partition_info { + __le64 volatile_capacity; + u8 flags; +} __packed; + +#define CXL_SET_PARTITION_IMMEDIATE_FLAG BIT(0) + /** * struct cxl_mem_command - Driver representation of a memory device command * @info: Command information as it exists for the UAPI |