hw/cxl: Support 4 HDM decoders at all levels of topology
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>
diff --git a/hw/cxl/cxl-component-utils.c b/hw/cxl/cxl-component-utils.c
index c0630ba..f3bbf0f 100644
--- a/hw/cxl/cxl-component-utils.c
+++ b/hw/cxl/cxl-component-utils.c
@@ -90,6 +90,9 @@
switch (offset) {
case A_CXL_HDM_DECODER0_CTRL:
+ case A_CXL_HDM_DECODER1_CTRL:
+ case A_CXL_HDM_DECODER2_CTRL:
+ case A_CXL_HDM_DECODER3_CTRL:
should_commit = FIELD_EX32(value, CXL_HDM_DECODER0_CTRL, COMMIT);
should_uncommit = !should_commit;
break;
@@ -129,7 +132,7 @@
}
if (offset >= A_CXL_HDM_DECODER_CAPABILITY &&
- offset <= A_CXL_HDM_DECODER0_TARGET_LIST_HI) {
+ offset <= A_CXL_HDM_DECODER3_TARGET_LIST_HI) {
dumb_hdm_handler(cxl_cstate, offset, value);
} else {
cregs->cache_mem_registers[offset / sizeof(*cregs->cache_mem_registers)] = value;
@@ -209,7 +212,7 @@
static void hdm_init_common(uint32_t *reg_state, uint32_t *write_msk,
enum reg_type type)
{
- int decoder_count = 1;
+ int decoder_count = CXL_HDM_DECODER_COUNT;
int hdm_inc = R_CXL_HDM_DECODER1_BASE_LO - R_CXL_HDM_DECODER0_BASE_LO;
int i;
diff --git a/hw/cxl/cxl-host.c b/hw/cxl/cxl-host.c
index 73c5426..2aa776c 100644
--- a/hw/cxl/cxl-host.c
+++ b/hw/cxl/cxl-host.c
@@ -97,35 +97,58 @@
}
}
-/* TODO: support, multiple hdm decoders */
static bool cxl_hdm_find_target(uint32_t *cache_mem, hwaddr addr,
uint8_t *target)
{
int hdm_inc = R_CXL_HDM_DECODER1_BASE_LO - R_CXL_HDM_DECODER0_BASE_LO;
- uint32_t ctrl;
- uint32_t ig_enc;
- uint32_t iw_enc;
- uint32_t target_idx;
- int i = 0;
+ unsigned int hdm_count;
+ bool found = false;
+ int i;
+ uint32_t cap;
- ctrl = cache_mem[R_CXL_HDM_DECODER0_CTRL + i * hdm_inc];
- if (!FIELD_EX32(ctrl, CXL_HDM_DECODER0_CTRL, COMMITTED)) {
- 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++) {
+ uint32_t ctrl, ig_enc, iw_enc, target_idx;
+ uint32_t low, high;
+ uint64_t base, size;
+
+ 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);
+ base = (low & 0xf0000000) | ((uint64_t)high << 32);
+ 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);
+ size = (low & 0xf0000000) | ((uint64_t)high << 32);
+ if (addr < base || addr >= base + size) {
+ continue;
+ }
+
+ ctrl = ldl_le_p(cache_mem + R_CXL_HDM_DECODER0_CTRL + i * hdm_inc);
+ if (!FIELD_EX32(ctrl, CXL_HDM_DECODER0_CTRL, COMMITTED)) {
+ return false;
+ }
+ found = true;
+ ig_enc = FIELD_EX32(ctrl, CXL_HDM_DECODER0_CTRL, IG);
+ iw_enc = FIELD_EX32(ctrl, CXL_HDM_DECODER0_CTRL, IW);
+ target_idx = (addr / cxl_decode_ig(ig_enc)) % (1 << iw_enc);
+
+ if (target_idx < 4) {
+ uint32_t val = ldl_le_p(cache_mem +
+ R_CXL_HDM_DECODER0_TARGET_LIST_LO +
+ i * hdm_inc);
+ *target = extract32(val, target_idx * 8, 8);
+ } else {
+ uint32_t val = ldl_le_p(cache_mem +
+ R_CXL_HDM_DECODER0_TARGET_LIST_HI +
+ i * hdm_inc);
+ *target = extract32(val, (target_idx - 4) * 8, 8);
+ }
+ break;
}
- ig_enc = FIELD_EX32(ctrl, CXL_HDM_DECODER0_CTRL, IG);
- iw_enc = FIELD_EX32(ctrl, CXL_HDM_DECODER0_CTRL, IW);
- target_idx = (addr / cxl_decode_ig(ig_enc)) % (1 << iw_enc);
-
- if (target_idx < 4) {
- *target = extract32(cache_mem[R_CXL_HDM_DECODER0_TARGET_LIST_LO],
- target_idx * 8, 8);
- } else {
- *target = extract32(cache_mem[R_CXL_HDM_DECODER0_TARGET_LIST_HI],
- (target_idx - 4) * 8, 8);
- }
-
- return true;
+ return found;
}
static PCIDevice *cxl_cfmws_find_device(CXLFixedWindow *fw, hwaddr addr)
diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
index 9f30221..c02be4c 100644
--- a/hw/mem/cxl_type3.c
+++ b/hw/mem/cxl_type3.c
@@ -393,8 +393,6 @@
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 @@
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 @@
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 @@
}
}
-/* 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,
diff --git a/include/hw/cxl/cxl_component.h b/include/hw/cxl/cxl_component.h
index 7c864d2..3c795a6 100644
--- a/include/hw/cxl/cxl_component.h
+++ b/include/hw/cxl/cxl_component.h
@@ -135,6 +135,10 @@
REG32(CXL_HDM_DECODER##n##_TARGET_LIST_LO, \
CXL_HDM_REGISTERS_OFFSET + (0x20 * n) + 0x24) \
REG32(CXL_HDM_DECODER##n##_TARGET_LIST_HI, \
+ CXL_HDM_REGISTERS_OFFSET + (0x20 * n) + 0x28) \
+ REG32(CXL_HDM_DECODER##n##_DPA_SKIP_LO, \
+ CXL_HDM_REGISTERS_OFFSET + (0x20 * n) + 0x24) \
+ REG32(CXL_HDM_DECODER##n##_DPA_SKIP_HI, \
CXL_HDM_REGISTERS_OFFSET + (0x20 * n) + 0x28)
REG32(CXL_HDM_DECODER_CAPABILITY, CXL_HDM_REGISTERS_OFFSET)
@@ -147,9 +151,13 @@
FIELD(CXL_HDM_DECODER_GLOBAL_CONTROL, POISON_ON_ERR_EN, 0, 1)
FIELD(CXL_HDM_DECODER_GLOBAL_CONTROL, HDM_DECODER_ENABLE, 1, 1)
+/* Support 4 decoders at all levels of topology */
+#define CXL_HDM_DECODER_COUNT 4
+
HDM_DECODER_INIT(0);
-/* Only used for HDM decoder registers block address increment */
HDM_DECODER_INIT(1);
+HDM_DECODER_INIT(2);
+HDM_DECODER_INIT(3);
/* 8.2.5.13 - CXL Extended Security Capability Structure (Root complex only) */
#define EXTSEC_ENTRY_MAX 256
