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hw/cxl: Support 4 HDM decoders at all levels of topology

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Support these decoders in CXL host bridges (pxb-cxl), CXL Switch USP
and CXL Type 3 end points.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Message-Id: <20230913132523.29780-5-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 2023-09-13 14:25:23 +01:00 • committed by Michael S. Tsirkin
parent 61c44bcf51
commit e967413fe0
4 changed files with 125 additions and 57 deletions
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98
hw/mem/cxl_type3.c
View file

@ -393,8 +393,6 @@ static void hdm_decoder_commit(CXLType3Dev *ct3d, int which)
uint32_t *cache_mem = cregs->cache_mem_registers;
uint32_t ctrl;
assert(which == 0);
ctrl = ldl_le_p(cache_mem + R_CXL_HDM_DECODER0_CTRL + which * hdm_inc);
/* TODO: Sanity checks that the decoder is possible */
ctrl = FIELD_DP32(ctrl, CXL_HDM_DECODER0_CTRL, ERR, 0);
@ -410,8 +408,6 @@ static void hdm_decoder_uncommit(CXLType3Dev *ct3d, int which)
uint32_t *cache_mem = cregs->cache_mem_registers;
uint32_t ctrl;
assert(which == 0);
ctrl = ldl_le_p(cache_mem + R_CXL_HDM_DECODER0_CTRL + which * hdm_inc);
ctrl = FIELD_DP32(ctrl, CXL_HDM_DECODER0_CTRL, ERR, 0);
@ -500,6 +496,21 @@ static void ct3d_reg_write(void *opaque, hwaddr offset, uint64_t value,
should_uncommit = !should_commit;
which_hdm = 0;
break;
case A_CXL_HDM_DECODER1_CTRL:
should_commit = FIELD_EX32(value, CXL_HDM_DECODER0_CTRL, COMMIT);
should_uncommit = !should_commit;
which_hdm = 1;
break;
case A_CXL_HDM_DECODER2_CTRL:
should_commit = FIELD_EX32(value, CXL_HDM_DECODER0_CTRL, COMMIT);
should_uncommit = !should_commit;
which_hdm = 2;
break;
case A_CXL_HDM_DECODER3_CTRL:
should_commit = FIELD_EX32(value, CXL_HDM_DECODER0_CTRL, COMMIT);
should_uncommit = !should_commit;
which_hdm = 3;
break;
case A_CXL_RAS_UNC_ERR_STATUS:
{
uint32_t capctrl = ldl_le_p(cache_mem + R_CXL_RAS_ERR_CAP_CTRL);
@ -771,40 +782,63 @@ static void ct3_exit(PCIDevice *pci_dev)
}
}
/* TODO: Support multiple HDM decoders and DPA skip */
static bool cxl_type3_dpa(CXLType3Dev *ct3d, hwaddr host_addr, uint64_t *dpa)
{
int hdm_inc = R_CXL_HDM_DECODER1_BASE_LO - R_CXL_HDM_DECODER0_BASE_LO;
uint32_t *cache_mem = ct3d->cxl_cstate.crb.cache_mem_registers;
uint64_t decoder_base, decoder_size, hpa_offset;
uint32_t hdm0_ctrl;
int ig, iw;
int i = 0;
unsigned int hdm_count;
uint32_t cap;
uint64_t dpa_base = 0;
int i;
decoder_base =
(((uint64_t)cache_mem[R_CXL_HDM_DECODER0_BASE_HI + i * hdm_inc] << 32) |
cache_mem[R_CXL_HDM_DECODER0_BASE_LO + i * hdm_inc]);
if ((uint64_t)host_addr < decoder_base) {
return false;
cap = ldl_le_p(cache_mem + R_CXL_HDM_DECODER_CAPABILITY);
hdm_count = cxl_decoder_count_dec(FIELD_EX32(cap,
CXL_HDM_DECODER_CAPABILITY,
DECODER_COUNT));
for (i = 0; i < hdm_count; i++) {
uint64_t decoder_base, decoder_size, hpa_offset, skip;
uint32_t hdm_ctrl, low, high;
int ig, iw;
low = ldl_le_p(cache_mem + R_CXL_HDM_DECODER0_BASE_LO + i * hdm_inc);
high = ldl_le_p(cache_mem + R_CXL_HDM_DECODER0_BASE_HI + i * hdm_inc);
decoder_base = ((uint64_t)high << 32) | (low & 0xf0000000);
low = ldl_le_p(cache_mem + R_CXL_HDM_DECODER0_SIZE_LO + i * hdm_inc);
high = ldl_le_p(cache_mem + R_CXL_HDM_DECODER0_SIZE_HI + i * hdm_inc);
decoder_size = ((uint64_t)high << 32) | (low & 0xf0000000);
low = ldl_le_p(cache_mem + R_CXL_HDM_DECODER0_DPA_SKIP_LO +
i * hdm_inc);
high = ldl_le_p(cache_mem + R_CXL_HDM_DECODER0_DPA_SKIP_HI +
i * hdm_inc);
skip = ((uint64_t)high << 32) | (low & 0xf0000000);
dpa_base += skip;
hpa_offset = (uint64_t)host_addr - decoder_base;
hdm_ctrl = ldl_le_p(cache_mem + R_CXL_HDM_DECODER0_CTRL + i * hdm_inc);
iw = FIELD_EX32(hdm_ctrl, CXL_HDM_DECODER0_CTRL, IW);
ig = FIELD_EX32(hdm_ctrl, CXL_HDM_DECODER0_CTRL, IG);
if (!FIELD_EX32(hdm_ctrl, CXL_HDM_DECODER0_CTRL, COMMITTED)) {
return false;
}
if (((uint64_t)host_addr < decoder_base) ||
(hpa_offset >= decoder_size)) {
dpa_base += decoder_size /
cxl_interleave_ways_dec(iw, &error_fatal);
continue;
}
*dpa = dpa_base +
((MAKE_64BIT_MASK(0, 8 + ig) & hpa_offset) |
((MAKE_64BIT_MASK(8 + ig + iw, 64 - 8 - ig - iw) & hpa_offset)
>> iw));
return true;
}
hpa_offset = (uint64_t)host_addr - decoder_base;
decoder_size =
((uint64_t)cache_mem[R_CXL_HDM_DECODER0_SIZE_HI + i * hdm_inc] << 32) |
cache_mem[R_CXL_HDM_DECODER0_SIZE_LO + i * hdm_inc];
if (hpa_offset >= decoder_size) {
return false;
}
hdm0_ctrl = cache_mem[R_CXL_HDM_DECODER0_CTRL + i * hdm_inc];
iw = FIELD_EX32(hdm0_ctrl, CXL_HDM_DECODER0_CTRL, IW);
ig = FIELD_EX32(hdm0_ctrl, CXL_HDM_DECODER0_CTRL, IG);
*dpa = (MAKE_64BIT_MASK(0, 8 + ig) & hpa_offset) |
((MAKE_64BIT_MASK(8 + ig + iw, 64 - 8 - ig - iw) & hpa_offset) >> iw);
return true;
return false;
}
static int cxl_type3_hpa_to_as_and_dpa(CXLType3Dev *ct3d,