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hw/cxl/component: Add utils for interleave parameter encoding/decoding

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Both registers and the CFMWS entries in CDAT use simple encodings
for the number of interleave ways and the interleave granularity.
Introduce simple conversion functions to/from the unencoded
number / size.  So far the iw decode has not been needed so is
it not implemented.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220429144110.25167-27-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jonathan Cameron 2022-04-29 15:40:51 +01:00 committed by Michael S. Tsirkin
parent 3d6a69b6eb
commit 829de299d1
2 changed files with 42 additions and 0 deletions
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34
hw/cxl/cxl-component-utils.c
View File

@ -9,6 +9,7 @@
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qapi/error.h"
#include "hw/pci/pci.h"
#include "hw/cxl/cxl.h"
@ -329,3 +330,36 @@ void cxl_component_create_dvsec(CXLComponentState *cxl,
range_init_nofail(&cxl->dvsecs[type], cxl->dvsec_offset, length);
cxl->dvsec_offset += length;
}
uint8_t cxl_interleave_ways_enc(int iw, Error **errp)
{
switch (iw) {
case 1: return 0x0;
case 2: return 0x1;
case 4: return 0x2;
case 8: return 0x3;
case 16: return 0x4;
case 3: return 0x8;
case 6: return 0x9;
case 12: return 0xa;
default:
error_setg(errp, "Interleave ways: %d not supported", iw);
return 0;
}
}
uint8_t cxl_interleave_granularity_enc(uint64_t gran, Error **errp)
{
switch (gran) {
case 256: return 0;
case 512: return 1;
case 1024: return 2;
case 2048: return 3;
case 4096: return 4;
case 8192: return 5;
case 16384: return 6;
default:
error_setg(errp, "Interleave granularity: %" PRIu64 " invalid", gran);
return 0;
}
}

8
include/hw/cxl/cxl_component.h
View File

@ -210,4 +210,12 @@ static inline int cxl_decoder_count_enc(int count)
return 0;
}
uint8_t cxl_interleave_ways_enc(int iw, Error **errp);
uint8_t cxl_interleave_granularity_enc(uint64_t gran, Error **errp);
static inline hwaddr cxl_decode_ig(int ig)
{
return 1 << (ig + 8);
}
#endif