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From 50b9d77232d41a33c2109894ae93ddad877c1747 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 11:56:04 -0800
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Subject: [PATCH 133/217] libcxl: add accessors for capacity fields of the
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IDENTIFY command
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The CXL PMEM provisioning model depends upon the values reported
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in the CXL IDENTIFY mailbox command when changing the partitioning
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between volatile and persistent capacity.
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Add accessors to the libcxl API to retrieve the total, volatile only,
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and persistent only capacities from the IDENTIFY command.
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The fields are specified in multiples of 256MB per the CXL 2.0 spec.
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Use the capacity multiplier to convert the raw data into bytes for user
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consumption.
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Link: https://lore.kernel.org/r/58dec40b15a68f134466f61421751994735e55c1.1645558189.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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cxl/lib/libcxl.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
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cxl/lib/libcxl.sym | 3 +++
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cxl/libcxl.h | 3 +++
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3 files changed, 50 insertions(+)
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diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c
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index 4557a71..9413384 100644
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--- a/cxl/lib/libcxl.c
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+++ b/cxl/lib/libcxl.c
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@@ -2277,6 +2277,17 @@ CXL_EXPORT struct cxl_cmd *cxl_cmd_new_identify(struct cxl_memdev *memdev)
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return cxl_cmd_new_generic(memdev, CXL_MEM_COMMAND_ID_IDENTIFY);
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}
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+static struct cxl_cmd_identify *
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+cmd_to_identify(struct cxl_cmd *cmd)
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+{
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+ if (cxl_cmd_validate_status(cmd, CXL_MEM_COMMAND_ID_IDENTIFY))
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+ return NULL;
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+
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+ if (!cmd)
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+ return NULL;
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+ return cmd->output_payload;
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+}
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+
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CXL_EXPORT int cxl_cmd_identify_get_fw_rev(struct cxl_cmd *cmd, char *fw_rev,
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int fw_len)
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{
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@@ -2321,6 +2332,39 @@ CXL_EXPORT unsigned int cxl_cmd_identify_get_label_size(struct cxl_cmd *cmd)
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return le32_to_cpu(id->lsa_size);
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}
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+CXL_EXPORT unsigned long long
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+cxl_cmd_identify_get_total_size(struct cxl_cmd *cmd)
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+{
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+ struct cxl_cmd_identify *c;
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+
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+ c = cmd_to_identify(cmd);
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+ if (!c)
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+ return ULLONG_MAX;
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+ return cxl_capacity_to_bytes(c->total_capacity);
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+}
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+
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+CXL_EXPORT unsigned long long
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+cxl_cmd_identify_get_volatile_only_size(struct cxl_cmd *cmd)
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+{
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+ struct cxl_cmd_identify *c;
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+
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+ c = cmd_to_identify(cmd);
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+ if (!c)
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+ return ULLONG_MAX;
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+ return cxl_capacity_to_bytes(c->volatile_capacity);
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+}
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+
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+CXL_EXPORT unsigned long long
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+cxl_cmd_identify_get_persistent_only_size(struct cxl_cmd *cmd)
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+{
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+ struct cxl_cmd_identify *c;
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+
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+ c = cmd_to_identify(cmd);
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+ if (!c)
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+ return ULLONG_MAX;
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+ return cxl_capacity_to_bytes(c->persistent_capacity);
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+}
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+
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CXL_EXPORT struct cxl_cmd *cxl_cmd_new_raw(struct cxl_memdev *memdev,
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int opcode)
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{
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diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym
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index 509e62d..5ac6e9b 100644
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--- a/cxl/lib/libcxl.sym
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+++ b/cxl/lib/libcxl.sym
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@@ -160,4 +160,7 @@ global:
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cxl_cmd_partition_get_active_persistent_size;
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cxl_cmd_partition_get_next_volatile_size;
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cxl_cmd_partition_get_next_persistent_size;
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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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} LIBCXL_1;
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diff --git a/cxl/libcxl.h b/cxl/libcxl.h
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index 2c0a8d1..6e18e84 100644
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--- a/cxl/libcxl.h
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+++ b/cxl/libcxl.h
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@@ -201,6 +201,9 @@ int cxl_cmd_get_mbox_status(struct cxl_cmd *cmd);
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int cxl_cmd_get_out_size(struct cxl_cmd *cmd);
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struct cxl_cmd *cxl_cmd_new_identify(struct cxl_memdev *memdev);
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int cxl_cmd_identify_get_fw_rev(struct cxl_cmd *cmd, char *fw_rev, int fw_len);
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+unsigned long long cxl_cmd_identify_get_total_size(struct cxl_cmd *cmd);
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+unsigned long long cxl_cmd_identify_get_volatile_only_size(struct cxl_cmd *cmd);
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+unsigned long long cxl_cmd_identify_get_persistent_only_size(struct cxl_cmd *cmd);
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unsigned long long cxl_cmd_identify_get_partition_align(struct cxl_cmd *cmd);
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unsigned int cxl_cmd_identify_get_label_size(struct cxl_cmd *cmd);
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struct cxl_cmd *cxl_cmd_new_get_health_info(struct cxl_memdev *memdev);
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--
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2.27.0
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