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