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hw/pci-bridge/cxl_root_port: Wire up MSI

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Done to avoid fixing ACPI route description of traditional PCI interrupts on q35
and because we should probably move with the times anyway.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Message-Id: <20230302133709.30373-5-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
This commit is contained in:
Jonathan Cameron 2023-03-02 13:37:05 +00:00 committed by Michael S. Tsirkin
parent 47f0e7ab32
commit 7e33517fdd
1 changed files with 61 additions and 0 deletions
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61
hw/pci-bridge/cxl_root_port.c
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@ -22,6 +22,7 @@
#include "qemu/range.h"
#include "hw/pci/pci_bridge.h"
#include "hw/pci/pcie_port.h"
#include "hw/pci/msi.h"
#include "hw/qdev-properties.h"
#include "hw/sysbus.h"
#include "qapi/error.h"
@ -29,6 +30,10 @@
#define CXL_ROOT_PORT_DID 0x7075
#define CXL_RP_MSI_OFFSET 0x60
#define CXL_RP_MSI_SUPPORTED_FLAGS PCI_MSI_FLAGS_MASKBIT
#define CXL_RP_MSI_NR_VECTOR 2
/* Copied from the gen root port which we derive */
#define GEN_PCIE_ROOT_PORT_AER_OFFSET 0x100
#define GEN_PCIE_ROOT_PORT_ACS_OFFSET \
@ -47,6 +52,49 @@ typedef struct CXLRootPort {
#define TYPE_CXL_ROOT_PORT "cxl-rp"
DECLARE_INSTANCE_CHECKER(CXLRootPort, CXL_ROOT_PORT, TYPE_CXL_ROOT_PORT)
/*
* If two MSI vector are allocated, Advanced Error Interrupt Message Number
* is 1. otherwise 0.
* 17.12.5.10 RPERRSTS, 32:27 bit Advanced Error Interrupt Message Number.
*/
static uint8_t cxl_rp_aer_vector(const PCIDevice *d)
{
switch (msi_nr_vectors_allocated(d)) {
case 1:
return 0;
case 2:
return 1;
case 4:
case 8:
case 16:
case 32:
default:
break;
}
abort();
return 0;
}
static int cxl_rp_interrupts_init(PCIDevice *d, Error **errp)
{
int rc;
rc = msi_init(d, CXL_RP_MSI_OFFSET, CXL_RP_MSI_NR_VECTOR,
CXL_RP_MSI_SUPPORTED_FLAGS & PCI_MSI_FLAGS_64BIT,
CXL_RP_MSI_SUPPORTED_FLAGS & PCI_MSI_FLAGS_MASKBIT,
errp);
if (rc < 0) {
assert(rc == -ENOTSUP);
}
return rc;
}
static void cxl_rp_interrupts_uninit(PCIDevice *d)
{
msi_uninit(d);
}
static void latch_registers(CXLRootPort *crp)
{
uint32_t *reg_state = crp->cxl_cstate.crb.cache_mem_registers;
@ -183,6 +231,15 @@ static void cxl_rp_dvsec_write_config(PCIDevice *dev, uint32_t addr,
}
}
static void cxl_rp_aer_vector_update(PCIDevice *d)
{
PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d);
if (rpc->aer_vector) {
pcie_aer_root_set_vector(d, rpc->aer_vector(d));
}
}
static void cxl_rp_write_config(PCIDevice *d, uint32_t address, uint32_t val,
int len)
{
@ -192,6 +249,7 @@ static void cxl_rp_write_config(PCIDevice *d, uint32_t address, uint32_t val,
pcie_cap_slot_get(d, &slt_ctl, &slt_sta);
pci_bridge_write_config(d, address, val, len);
cxl_rp_aer_vector_update(d);
pcie_cap_flr_write_config(d, address, val, len);
pcie_cap_slot_write_config(d, slt_ctl, slt_sta, address, val, len);
pcie_aer_write_config(d, address, val, len);
@ -220,6 +278,9 @@ static void cxl_root_port_class_init(ObjectClass *oc, void *data)
rpc->aer_offset = GEN_PCIE_ROOT_PORT_AER_OFFSET;
rpc->acs_offset = GEN_PCIE_ROOT_PORT_ACS_OFFSET;
rpc->aer_vector = cxl_rp_aer_vector;
rpc->interrupts_init = cxl_rp_interrupts_init;
rpc->interrupts_uninit = cxl_rp_interrupts_uninit;
dc->hotpluggable = false;
}