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qemu/hw/cxl/cxl-component-utils.c
Ben Widawsky 3540bf56e4 hw/cxl/component Add a dumb HDM decoder handler 
Add a trivial handler for now to cover the root bridge
where we could do some error checking in future.

Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20220429144110.25167-35-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2022-05-13 07:57:26 -04:00

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/*
* CXL Utility library for components
*
* Copyright(C) 2020 Intel Corporation.
*
* This work is licensed under the terms of the GNU GPL, version 2. See the
* COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qapi/error.h"
#include "hw/pci/pci.h"
#include "hw/cxl/cxl.h"
static uint64_t cxl_cache_mem_read_reg(void *opaque, hwaddr offset,
unsigned size)
{
CXLComponentState *cxl_cstate = opaque;
ComponentRegisters *cregs = &cxl_cstate->crb;
if (size == 8) {
qemu_log_mask(LOG_UNIMP,
"CXL 8 byte cache mem registers not implemented\n");
return 0;
}
if (cregs->special_ops && cregs->special_ops->read) {
return cregs->special_ops->read(cxl_cstate, offset, size);
} else {
return cregs->cache_mem_registers[offset / sizeof(*cregs->cache_mem_registers)];
}
}
static void dumb_hdm_handler(CXLComponentState *cxl_cstate, hwaddr offset,
uint32_t value)
{
ComponentRegisters *cregs = &cxl_cstate->crb;
uint32_t *cache_mem = cregs->cache_mem_registers;
bool should_commit = false;
switch (offset) {
case A_CXL_HDM_DECODER0_CTRL:
should_commit = FIELD_EX32(value, CXL_HDM_DECODER0_CTRL, COMMIT);
break;
default:
break;
}
memory_region_transaction_begin();
stl_le_p((uint8_t *)cache_mem + offset, value);
if (should_commit) {
ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, COMMIT, 0);
ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, ERR, 0);
ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, COMMITTED, 1);
}
memory_region_transaction_commit();
}
static void cxl_cache_mem_write_reg(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
CXLComponentState *cxl_cstate = opaque;
ComponentRegisters *cregs = &cxl_cstate->crb;
uint32_t mask;
if (size == 8) {
qemu_log_mask(LOG_UNIMP,
"CXL 8 byte cache mem registers not implemented\n");
return;
}
mask = cregs->cache_mem_regs_write_mask[offset / sizeof(*cregs->cache_mem_regs_write_mask)];
value &= mask;
/* RO bits should remain constant. Done by reading existing value */
value |= ~mask & cregs->cache_mem_registers[offset / sizeof(*cregs->cache_mem_registers)];
if (cregs->special_ops && cregs->special_ops->write) {
cregs->special_ops->write(cxl_cstate, offset, value, size);
return;
}
if (offset >= A_CXL_HDM_DECODER_CAPABILITY &&
offset <= A_CXL_HDM_DECODER0_TARGET_LIST_HI) {
dumb_hdm_handler(cxl_cstate, offset, value);
} else {
cregs->cache_mem_registers[offset / sizeof(*cregs->cache_mem_registers)] = value;
}
}
/*
* 8.2.3
* The access restrictions specified in Section 8.2.2 also apply to CXL 2.0
* Component Registers.
*
* 8.2.2
* • A 32 bit register shall be accessed as a 4 Bytes quantity. Partial
* reads are not permitted.
* • A 64 bit register shall be accessed as a 8 Bytes quantity. Partial
* reads are not permitted.
*
* As of the spec defined today, only 4 byte registers exist.
*/
static const MemoryRegionOps cache_mem_ops = {
.read = cxl_cache_mem_read_reg,
.write = cxl_cache_mem_write_reg,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 8,
.unaligned = false,
},
.impl = {
.min_access_size = 4,
.max_access_size = 8,
},
};
void cxl_component_register_block_init(Object *obj,
CXLComponentState *cxl_cstate,
const char *type)
{
ComponentRegisters *cregs = &cxl_cstate->crb;
memory_region_init(&cregs->component_registers, obj, type,
CXL2_COMPONENT_BLOCK_SIZE);
/* io registers controls link which we don't care about in QEMU */
memory_region_init_io(&cregs->io, obj, NULL, cregs, ".io",
CXL2_COMPONENT_IO_REGION_SIZE);
memory_region_init_io(&cregs->cache_mem, obj, &cache_mem_ops, cregs,
".cache_mem", CXL2_COMPONENT_CM_REGION_SIZE);
memory_region_add_subregion(&cregs->component_registers, 0, &cregs->io);
memory_region_add_subregion(&cregs->component_registers,
CXL2_COMPONENT_IO_REGION_SIZE,
&cregs->cache_mem);
}
static void ras_init_common(uint32_t *reg_state, uint32_t *write_msk)
{
/*
* Error status is RW1C but given bits are not yet set, it can
* be handled as RO.
*/
reg_state[R_CXL_RAS_UNC_ERR_STATUS] = 0;
/* Bits 12-13 and 17-31 reserved in CXL 2.0 */
reg_state[R_CXL_RAS_UNC_ERR_MASK] = 0x1cfff;
write_msk[R_CXL_RAS_UNC_ERR_MASK] = 0x1cfff;
reg_state[R_CXL_RAS_UNC_ERR_SEVERITY] = 0x1cfff;
write_msk[R_CXL_RAS_UNC_ERR_SEVERITY] = 0x1cfff;
reg_state[R_CXL_RAS_COR_ERR_STATUS] = 0;
reg_state[R_CXL_RAS_COR_ERR_MASK] = 0x7f;
write_msk[R_CXL_RAS_COR_ERR_MASK] = 0x7f;
/* CXL switches and devices must set */
reg_state[R_CXL_RAS_ERR_CAP_CTRL] = 0x00;
}
static void hdm_init_common(uint32_t *reg_state, uint32_t *write_msk)
{
int decoder_count = 1;
int i;
ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_CAPABILITY, DECODER_COUNT,
cxl_decoder_count_enc(decoder_count));
ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_CAPABILITY, TARGET_COUNT, 1);
ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_CAPABILITY, INTERLEAVE_256B, 1);
ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_CAPABILITY, INTERLEAVE_4K, 1);
ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_CAPABILITY, POISON_ON_ERR_CAP, 0);
ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_GLOBAL_CONTROL,
HDM_DECODER_ENABLE, 0);
write_msk[R_CXL_HDM_DECODER_GLOBAL_CONTROL] = 0x3;
for (i = 0; i < decoder_count; i++) {
write_msk[R_CXL_HDM_DECODER0_BASE_LO + i * 0x20] = 0xf0000000;
write_msk[R_CXL_HDM_DECODER0_BASE_HI + i * 0x20] = 0xffffffff;
write_msk[R_CXL_HDM_DECODER0_SIZE_LO + i * 0x20] = 0xf0000000;
write_msk[R_CXL_HDM_DECODER0_SIZE_HI + i * 0x20] = 0xffffffff;
write_msk[R_CXL_HDM_DECODER0_CTRL + i * 0x20] = 0x13ff;
}
}
void cxl_component_register_init_common(uint32_t *reg_state, uint32_t *write_msk,
enum reg_type type)
{
int caps = 0;
/*
* In CXL 2.0 the capabilities required for each CXL component are such that,
* with the ordering chosen here, a single number can be used to define
* which capabilities should be provided.
*/
switch (type) {
case CXL2_DOWNSTREAM_PORT:
case CXL2_DEVICE:
/* RAS, Link */
caps = 2;
break;
case CXL2_UPSTREAM_PORT:
case CXL2_TYPE3_DEVICE:
case CXL2_LOGICAL_DEVICE:
/* + HDM */
caps = 3;
break;
case CXL2_ROOT_PORT:
/* + Extended Security, + Snoop */
caps = 5;
break;
default:
abort();
}
memset(reg_state, 0, CXL2_COMPONENT_CM_REGION_SIZE);
/* CXL Capability Header Register */
ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, ID, 1);
ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, VERSION, 1);
ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, CACHE_MEM_VERSION, 1);
ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, ARRAY_SIZE, caps);
#define init_cap_reg(reg, id, version) \
QEMU_BUILD_BUG_ON(CXL_##reg##_REGISTERS_OFFSET == 0); \
do { \
int which = R_CXL_##reg##_CAPABILITY_HEADER; \
reg_state[which] = FIELD_DP32(reg_state[which], \
CXL_##reg##_CAPABILITY_HEADER, ID, id); \
reg_state[which] = \
FIELD_DP32(reg_state[which], CXL_##reg##_CAPABILITY_HEADER, \
VERSION, version); \
reg_state[which] = \
FIELD_DP32(reg_state[which], CXL_##reg##_CAPABILITY_HEADER, PTR, \
CXL_##reg##_REGISTERS_OFFSET); \
} while (0)
init_cap_reg(RAS, 2, 2);
ras_init_common(reg_state, write_msk);
init_cap_reg(LINK, 4, 2);
if (caps < 3) {
return;
}
init_cap_reg(HDM, 5, 1);
hdm_init_common(reg_state, write_msk);
if (caps < 5) {
return;
}
init_cap_reg(EXTSEC, 6, 1);
init_cap_reg(SNOOP, 8, 1);
#undef init_cap_reg
}
/*
* Helper to creates a DVSEC header for a CXL entity. The caller is responsible
* for tracking the valid offset.
*
* This function will build the DVSEC header on behalf of the caller and then
* copy in the remaining data for the vendor specific bits.
* It will also set up appropriate write masks.
*/
void cxl_component_create_dvsec(CXLComponentState *cxl,
enum reg_type cxl_dev_type, uint16_t length,
uint16_t type, uint8_t rev, uint8_t *body)
{
PCIDevice *pdev = cxl->pdev;
uint16_t offset = cxl->dvsec_offset;
uint8_t *wmask = pdev->wmask;
assert(offset >= PCI_CFG_SPACE_SIZE &&
((offset + length) < PCI_CFG_SPACE_EXP_SIZE));
assert((length & 0xf000) == 0);
assert((rev & ~0xf) == 0);
/* Create the DVSEC in the MCFG space */
pcie_add_capability(pdev, PCI_EXT_CAP_ID_DVSEC, 1, offset, length);
pci_set_long(pdev->config + offset + PCIE_DVSEC_HEADER1_OFFSET,
(length << 20) | (rev << 16) | CXL_VENDOR_ID);
pci_set_word(pdev->config + offset + PCIE_DVSEC_ID_OFFSET, type);
memcpy(pdev->config + offset + sizeof(DVSECHeader),
body + sizeof(DVSECHeader),
length - sizeof(DVSECHeader));
/* Configure write masks */
switch (type) {
case PCIE_CXL_DEVICE_DVSEC:
/* Cntrl RW Lock - so needs explicit blocking when lock is set */
wmask[offset + offsetof(CXLDVSECDevice, ctrl)] = 0xFD;
wmask[offset + offsetof(CXLDVSECDevice, ctrl) + 1] = 0x4F;
/* Status is RW1CS */
wmask[offset + offsetof(CXLDVSECDevice, ctrl2)] = 0x0F;
/* Lock is RW Once */
wmask[offset + offsetof(CXLDVSECDevice, lock)] = 0x01;
/* range1/2_base_high/low is RW Lock */
wmask[offset + offsetof(CXLDVSECDevice, range1_base_hi)] = 0xFF;
wmask[offset + offsetof(CXLDVSECDevice, range1_base_hi) + 1] = 0xFF;
wmask[offset + offsetof(CXLDVSECDevice, range1_base_hi) + 2] = 0xFF;
wmask[offset + offsetof(CXLDVSECDevice, range1_base_hi) + 3] = 0xFF;
wmask[offset + offsetof(CXLDVSECDevice, range1_base_lo) + 3] = 0xF0;
wmask[offset + offsetof(CXLDVSECDevice, range2_base_hi)] = 0xFF;
wmask[offset + offsetof(CXLDVSECDevice, range2_base_hi) + 1] = 0xFF;
wmask[offset + offsetof(CXLDVSECDevice, range2_base_hi) + 2] = 0xFF;
wmask[offset + offsetof(CXLDVSECDevice, range2_base_hi) + 3] = 0xFF;
wmask[offset + offsetof(CXLDVSECDevice, range2_base_lo) + 3] = 0xF0;
break;
case NON_CXL_FUNCTION_MAP_DVSEC:
break; /* Not yet implemented */
case EXTENSIONS_PORT_DVSEC:
wmask[offset + offsetof(CXLDVSECPortExtensions, control)] = 0x0F;
wmask[offset + offsetof(CXLDVSECPortExtensions, control) + 1] = 0x40;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_bus_base)] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_bus_limit)] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_memory_base)] = 0xF0;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_memory_base) + 1] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_memory_limit)] = 0xF0;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_memory_limit) + 1] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_base)] = 0xF0;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_base) + 1] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_limit)] = 0xF0;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_limit) + 1] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_base_high)] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_base_high) + 1] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_base_high) + 2] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_base_high) + 3] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_limit_high)] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_limit_high) + 1] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_limit_high) + 2] = 0xFF;
wmask[offset + offsetof(CXLDVSECPortExtensions, alt_prefetch_limit_high) + 3] = 0xFF;
break;
case GPF_PORT_DVSEC:
wmask[offset + offsetof(CXLDVSECPortGPF, phase1_ctrl)] = 0x0F;
wmask[offset + offsetof(CXLDVSECPortGPF, phase1_ctrl) + 1] = 0x0F;
wmask[offset + offsetof(CXLDVSECPortGPF, phase2_ctrl)] = 0x0F;
wmask[offset + offsetof(CXLDVSECPortGPF, phase2_ctrl) + 1] = 0x0F;
break;
case GPF_DEVICE_DVSEC:
wmask[offset + offsetof(CXLDVSECDeviceGPF, phase2_duration)] = 0x0F;
wmask[offset + offsetof(CXLDVSECDeviceGPF, phase2_duration) + 1] = 0x0F;
wmask[offset + offsetof(CXLDVSECDeviceGPF, phase2_power)] = 0xFF;
wmask[offset + offsetof(CXLDVSECDeviceGPF, phase2_power) + 1] = 0xFF;
wmask[offset + offsetof(CXLDVSECDeviceGPF, phase2_power) + 2] = 0xFF;
wmask[offset + offsetof(CXLDVSECDeviceGPF, phase2_power) + 3] = 0xFF;
break;
case PCIE_FLEXBUS_PORT_DVSEC:
switch (cxl_dev_type) {
case CXL2_ROOT_PORT:
/* No MLD */
wmask[offset + offsetof(CXLDVSECPortFlexBus, ctrl)] = 0xbd;
break;
case CXL2_DOWNSTREAM_PORT:
wmask[offset + offsetof(CXLDVSECPortFlexBus, ctrl)] = 0xfd;
break;
default: /* Registers are RO for other component types */
break;
}
/* There are rw1cs bits in the status register but never set currently */
break;
}
/* Update state for future DVSEC additions */
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;
}
}
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