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cxl/pci: Store memory capacity values

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The Identify Memory Device command returns information about the
volatile only and persistent only memory capacities.  Store those values
in the cxl_mem structure for later use.  While at it, reuse those
calculations to calculate the ram and pmem ranges.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20210617221620.1904031-2-ira.weiny@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Ira Weiny 2021-06-17 15:16:18 -07:00 committed by Dan Williams
parent 5b68705d1e
commit 0b9159d0ff
2 changed files with 37 additions and 3 deletions
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4
drivers/cxl/cxlmem.h
View file

@ -95,5 +95,9 @@ struct cxl_mem {
struct range pmem_range;
struct range ram_range;
u64 total_bytes;
u64 volatile_only_bytes;
u64 persistent_only_bytes;
u64 partition_align_bytes;
};
#endif /* __CXL_MEM_H__ */

36
drivers/cxl/pci.c
View file

@ -64,6 +64,15 @@ enum opcode {
CXL_MBOX_OP_MAX = 0x10000
};
/*
* CXL 2.0 - Memory capacity multiplier
* See Section 8.2.9.5
*
* Volatile, Persistent, and Partition capacities are specified to be in
* multiples of 256MB - define a multiplier to convert to/from bytes.
*/
#define CXL_CAPACITY_MULTIPLIER SZ_256M
/**
* struct mbox_cmd - A command to be submitted to hardware.
* @opcode: (input) The command set and command submitted to hardware.
@ -1350,16 +1359,37 @@ static int cxl_mem_identify(struct cxl_mem *cxlm)
if (rc < 0)
return rc;
cxlm->total_bytes = le64_to_cpu(id.total_capacity);
cxlm->total_bytes *= CXL_CAPACITY_MULTIPLIER;
cxlm->volatile_only_bytes = le64_to_cpu(id.volatile_capacity);
cxlm->volatile_only_bytes *= CXL_CAPACITY_MULTIPLIER;
cxlm->persistent_only_bytes = le64_to_cpu(id.persistent_capacity);
cxlm->persistent_only_bytes *= CXL_CAPACITY_MULTIPLIER;
cxlm->partition_align_bytes = le64_to_cpu(id.partition_align);
cxlm->partition_align_bytes *= CXL_CAPACITY_MULTIPLIER;
dev_dbg(&cxlm->pdev->dev, "Identify Memory Device\n"
" total_bytes = %#llx\n"
" volatile_only_bytes = %#llx\n"
" persistent_only_bytes = %#llx\n"
" partition_align_bytes = %#llx\n",
cxlm->total_bytes,
cxlm->volatile_only_bytes,
cxlm->persistent_only_bytes,
cxlm->partition_align_bytes);
/*
* TODO: enumerate DPA map, as 'ram' and 'pmem' do not alias.
* For now, only the capacity is exported in sysfs
*/
cxlm->ram_range.start = 0;
cxlm->ram_range.end = le64_to_cpu(id.volatile_capacity) * SZ_256M - 1;
cxlm->ram_range.end = cxlm->volatile_only_bytes - 1;
cxlm->pmem_range.start = 0;
cxlm->pmem_range.end =
le64_to_cpu(id.persistent_capacity) * SZ_256M - 1;
cxlm->pmem_range.end = cxlm->persistent_only_bytes - 1;
cxlm->lsa_size = le32_to_cpu(id.lsa_size);
memcpy(cxlm->firmware_version, id.fw_revision, sizeof(id.fw_revision));