From b424b4bfd555654fc41996e964bdd0495f585793 Mon Sep 17 00:00:00 2001 From: Alison Schofield Date: Tue, 22 Feb 2022 11:56:07 -0800 Subject: [PATCH 136/217] libcxl: add interfaces for SET_PARTITION_INFO mailbox command The CXL PMEM provisioning model depends upon the CXL mailbox command SET_PARTITION_INFO to change a device's partitioning between volatile and persistent capacity. Add interfaces to libcxl to allocate and send a SET_PARTITION_INFO mailbox command as defined in the CXL 2.0 specification. Link: https://lore.kernel.org/r/978c1cf78f3dd22f6070e51a241bc63cac9297de.1645558189.git.alison.schofield@intel.com Reviewed-by: Dan Williams Signed-off-by: Alison Schofield Signed-off-by: Vishal Verma --- Documentation/cxl/lib/libcxl.txt | 11 +++++++++++ cxl/lib/libcxl.c | 28 ++++++++++++++++++++++++++++ cxl/lib/libcxl.sym | 2 ++ cxl/lib/private.h | 8 ++++++++ cxl/libcxl.h | 10 ++++++++++ 5 files changed, 59 insertions(+) diff --git a/Documentation/cxl/lib/libcxl.txt b/Documentation/cxl/lib/libcxl.txt index a6986ab..7b223cb 100644 --- a/Documentation/cxl/lib/libcxl.txt +++ b/Documentation/cxl/lib/libcxl.txt @@ -132,6 +132,8 @@ int cxl_memdev_read_label(struct cxl_memdev *memdev, void *buf, size_t length, int cxl_memdev_write_label(struct cxl_memdev *memdev, void *buf, size_t length, size_t offset); struct cxl_cmd *cxl_cmd_new_get_partition(struct cxl_memdev *memdev); +struct cxl_cmd *cxl_cmd_new_set_partition(struct cxl_memdev *memdev, + unsigned long long volatile_size); ---- @@ -148,6 +150,8 @@ this sub-class of interfaces, there are: a CXL standard opcode. See the potential command ids in /usr/include/linux/cxl_mem.h. + * 'cxl_cmd__set_' interfaces that set specific fields in a cxl_cmd + * 'cxl_cmd_submit' which submits the command via ioctl() * 'cxl_cmd__get_' interfaces that get specific fields out of the @@ -167,6 +171,13 @@ cxl_memdev{read,write,zero}_label() are helpers for marshaling multiple label access commands over an arbitrary extent of the device's label area. +cxl_cmd_partition_set_mode() supports selecting NEXTBOOT or IMMEDIATE +mode. When CXL_SETPART_IMMEDIATE mode is set, it is the caller’s +responsibility to avoid immediate changes to partitioning when the +device is in use. When CXL_SETPART_NEXTBOOT mode is set, the change +in partitioning shall become the “next” configuration, to become +active on the next device reset. + BUSES ----- The CXL Memory space is CPU and Device coherent. The address ranges that diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c index c05c13c..daa2bbc 100644 --- a/cxl/lib/libcxl.c +++ b/cxl/lib/libcxl.c @@ -2478,6 +2478,34 @@ cxl_cmd_partition_get_next_persistent_size(struct cxl_cmd *cmd) return cxl_capacity_to_bytes(c->next_persistent); } +CXL_EXPORT int cxl_cmd_partition_set_mode(struct cxl_cmd *cmd, + enum cxl_setpartition_mode mode) +{ + struct cxl_cmd_set_partition *setpart = cmd->input_payload; + + if (mode == CXL_SETPART_IMMEDIATE) + setpart->flags = CXL_CMD_SET_PARTITION_FLAG_IMMEDIATE; + else + setpart->flags = !CXL_CMD_SET_PARTITION_FLAG_IMMEDIATE; + + return 0; +} + +CXL_EXPORT struct cxl_cmd *cxl_cmd_new_set_partition(struct cxl_memdev *memdev, + unsigned long long volatile_size) +{ + struct cxl_cmd_set_partition *setpart; + struct cxl_cmd *cmd; + + cmd = cxl_cmd_new_generic(memdev, + CXL_MEM_COMMAND_ID_SET_PARTITION_INFO); + + setpart = cmd->input_payload; + setpart->volatile_size = cpu_to_le64(volatile_size) + / CXL_CAPACITY_MULTIPLIER; + return cmd; +} + CXL_EXPORT int cxl_cmd_submit(struct cxl_cmd *cmd) { struct cxl_memdev *memdev = cmd->memdev; diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym index 5ac6e9b..aab1112 100644 --- a/cxl/lib/libcxl.sym +++ b/cxl/lib/libcxl.sym @@ -163,4 +163,6 @@ global: cxl_cmd_identify_get_total_size; cxl_cmd_identify_get_volatile_only_size; cxl_cmd_identify_get_persistent_only_size; + cxl_cmd_new_set_partition; + cxl_cmd_partition_set_mode; } LIBCXL_1; diff --git a/cxl/lib/private.h b/cxl/lib/private.h index 7f3a562..c6d88f7 100644 --- a/cxl/lib/private.h +++ b/cxl/lib/private.h @@ -195,6 +195,14 @@ struct cxl_cmd_get_partition { #define CXL_CAPACITY_MULTIPLIER SZ_256M +struct cxl_cmd_set_partition { + le64 volatile_size; + u8 flags; +} __attribute__((packed)); + +/* CXL 2.0 8.2.9.5.2 Set Partition Info */ +#define CXL_CMD_SET_PARTITION_FLAG_IMMEDIATE BIT(0) + /* CXL 2.0 8.2.9.5.3 Byte 0 Health Status */ #define CXL_CMD_HEALTH_INFO_STATUS_MAINTENANCE_NEEDED_MASK BIT(0) #define CXL_CMD_HEALTH_INFO_STATUS_PERFORMANCE_DEGRADED_MASK BIT(1) diff --git a/cxl/libcxl.h b/cxl/libcxl.h index 6e18e84..0063d31 100644 --- a/cxl/libcxl.h +++ b/cxl/libcxl.h @@ -250,6 +250,16 @@ unsigned long long cxl_cmd_partition_get_active_volatile_size(struct cxl_cmd *cm unsigned long long cxl_cmd_partition_get_active_persistent_size(struct cxl_cmd *cmd); unsigned long long cxl_cmd_partition_get_next_volatile_size(struct cxl_cmd *cmd); unsigned long long cxl_cmd_partition_get_next_persistent_size(struct cxl_cmd *cmd); +struct cxl_cmd *cxl_cmd_new_set_partition(struct cxl_memdev *memdev, + unsigned long long volatile_size); + +enum cxl_setpartition_mode { + CXL_SETPART_NEXTBOOT, + CXL_SETPART_IMMEDIATE, +}; + +int cxl_cmd_partition_set_mode(struct cxl_cmd *cmd, + enum cxl_setpartition_mode mode); #ifdef __cplusplus } /* extern "C" */ -- 2.27.0