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hw/mem/cxl_type3: Add host backend and address space handling for DC regions

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Add (file/memory backed) host backend for DCD. All the dynamic capacity
regions will share a single, large enough host backend. Set up address
space for DC regions to support read/write operations to dynamic capacity
for DCD.

With the change, the following support is added:
1. Add a new property to type3 device "volatile-dc-memdev" to point to host
   memory backend for dynamic capacity. Currently, all DC regions share one
   host backend;
2. Add namespace for dynamic capacity for read/write support;
3. Create cdat entries for each dynamic capacity region.

Reviewed-by: Gregory Price <gregory.price@memverge.com>
Signed-off-by: Fan Ni <fan.ni@samsung.com>
Message-Id: <20240523174651.1089554-9-nifan.cxl@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Fan Ni 2024-05-23 10:44:48 -07:00 • committed by Michael S. Tsirkin
parent 69e4fb569d
commit 90de94612b
3 changed files with 164 additions and 37 deletions
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8
include/hw/cxl/cxl_device.h
View file

@ -467,6 +467,14 @@ struct CXLType3Dev {
uint64_t poison_list_overflow_ts;
struct dynamic_capacity {
HostMemoryBackend *host_dc;
AddressSpace host_dc_as;
/*
* total_capacity is equivalent to the dynamic capability
* memory region size.
*/
uint64_t total_capacity; /* 256M aligned */
uint8_t num_regions; /* 0-8 regions */
CXLDCRegion regions[DCD_MAX_NUM_REGION];
} dc;