diff options
Diffstat (limited to 'hw/spapr_pci.c')
| -rw-r--r-- | hw/spapr_pci.c | 245 |
1 files changed, 244 insertions, 1 deletions
diff --git a/hw/spapr_pci.c b/hw/spapr_pci.c index 1eb1a7edc9..780a4d6f16 100644 --- a/hw/spapr_pci.c +++ b/hw/spapr_pci.c @@ -24,6 +24,8 @@ */ #include "hw.h" #include "pci.h" +#include "msi.h" +#include "msix.h" #include "pci_host.h" #include "hw/spapr.h" #include "hw/spapr_pci.h" @@ -33,6 +35,17 @@ #include "hw/pci_internals.h" +/* Copied from the kernel arch/powerpc/platforms/pseries/msi.c */ +#define RTAS_QUERY_FN 0 +#define RTAS_CHANGE_FN 1 +#define RTAS_RESET_FN 2 +#define RTAS_CHANGE_MSI_FN 3 +#define RTAS_CHANGE_MSIX_FN 4 + +/* Interrupt types to return on RTAS_CHANGE_* */ +#define RTAS_TYPE_MSI 1 +#define RTAS_TYPE_MSIX 2 + static sPAPRPHBState *find_phb(sPAPREnvironment *spapr, uint64_t buid) { sPAPRPHBState *phb; @@ -211,6 +224,191 @@ static void rtas_write_pci_config(sPAPREnvironment *spapr, finish_write_pci_config(spapr, 0, addr, size, val, rets); } +/* + * Find an entry with config_addr or returns the empty one if not found AND + * alloc_new is set. + * At the moment the msi_table entries are never released so there is + * no point to look till the end of the list if we need to find the free entry. + */ +static int spapr_msicfg_find(sPAPRPHBState *phb, uint32_t config_addr, + bool alloc_new) +{ + int i; + + for (i = 0; i < SPAPR_MSIX_MAX_DEVS; ++i) { + if (!phb->msi_table[i].nvec) { + break; + } + if (phb->msi_table[i].config_addr == config_addr) { + return i; + } + } + if ((i < SPAPR_MSIX_MAX_DEVS) && alloc_new) { + trace_spapr_pci_msi("Allocating new MSI config", i, config_addr); + return i; + } + + return -1; +} + +/* + * Set MSI/MSIX message data. + * This is required for msi_notify()/msix_notify() which + * will write at the addresses via spapr_msi_write(). + */ +static void spapr_msi_setmsg(PCIDevice *pdev, target_phys_addr_t addr, + bool msix, unsigned req_num) +{ + unsigned i; + MSIMessage msg = { .address = addr, .data = 0 }; + + if (!msix) { + msi_set_message(pdev, msg); + trace_spapr_pci_msi_setup(pdev->name, 0, msg.address); + return; + } + + for (i = 0; i < req_num; ++i) { + msg.address = addr | (i << 2); + msix_set_message(pdev, i, msg); + trace_spapr_pci_msi_setup(pdev->name, i, msg.address); + } +} + +static void rtas_ibm_change_msi(sPAPREnvironment *spapr, + uint32_t token, uint32_t nargs, + target_ulong args, uint32_t nret, + target_ulong rets) +{ + uint32_t config_addr = rtas_ld(args, 0); + uint64_t buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); + unsigned int func = rtas_ld(args, 3); + unsigned int req_num = rtas_ld(args, 4); /* 0 == remove all */ + unsigned int seq_num = rtas_ld(args, 5); + unsigned int ret_intr_type; + int ndev, irq; + sPAPRPHBState *phb = NULL; + PCIDevice *pdev = NULL; + + switch (func) { + case RTAS_CHANGE_MSI_FN: + case RTAS_CHANGE_FN: + ret_intr_type = RTAS_TYPE_MSI; + break; + case RTAS_CHANGE_MSIX_FN: + ret_intr_type = RTAS_TYPE_MSIX; + break; + default: + fprintf(stderr, "rtas_ibm_change_msi(%u) is not implemented\n", func); + rtas_st(rets, 0, -3); /* Parameter error */ + return; + } + + /* Fins sPAPRPHBState */ + phb = find_phb(spapr, buid); + if (phb) { + pdev = find_dev(spapr, buid, config_addr); + } + if (!phb || !pdev) { + rtas_st(rets, 0, -3); /* Parameter error */ + return; + } + + /* Releasing MSIs */ + if (!req_num) { + ndev = spapr_msicfg_find(phb, config_addr, false); + if (ndev < 0) { + trace_spapr_pci_msi("MSI has not been enabled", -1, config_addr); + rtas_st(rets, 0, -1); /* Hardware error */ + return; + } + trace_spapr_pci_msi("Released MSIs", ndev, config_addr); + rtas_st(rets, 0, 0); + rtas_st(rets, 1, 0); + return; + } + + /* Enabling MSI */ + + /* Find a device number in the map to add or reuse the existing one */ + ndev = spapr_msicfg_find(phb, config_addr, true); + if (ndev >= SPAPR_MSIX_MAX_DEVS || ndev < 0) { + fprintf(stderr, "No free entry for a new MSI device\n"); + rtas_st(rets, 0, -1); /* Hardware error */ + return; + } + trace_spapr_pci_msi("Configuring MSI", ndev, config_addr); + + /* Check if there is an old config and MSI number has not changed */ + if (phb->msi_table[ndev].nvec && (req_num != phb->msi_table[ndev].nvec)) { + /* Unexpected behaviour */ + fprintf(stderr, "Cannot reuse MSI config for device#%d", ndev); + rtas_st(rets, 0, -1); /* Hardware error */ + return; + } + + /* There is no cached config, allocate MSIs */ + if (!phb->msi_table[ndev].nvec) { + irq = spapr_allocate_irq_block(req_num, XICS_MSI); + if (irq < 0) { + fprintf(stderr, "Cannot allocate MSIs for device#%d", ndev); + rtas_st(rets, 0, -1); /* Hardware error */ + return; + } + phb->msi_table[ndev].irq = irq; + phb->msi_table[ndev].nvec = req_num; + phb->msi_table[ndev].config_addr = config_addr; + } + + /* Setup MSI/MSIX vectors in the device (via cfgspace or MSIX BAR) */ + spapr_msi_setmsg(pdev, phb->msi_win_addr | (ndev << 16), + ret_intr_type == RTAS_TYPE_MSIX, req_num); + + rtas_st(rets, 0, 0); + rtas_st(rets, 1, req_num); + rtas_st(rets, 2, ++seq_num); + rtas_st(rets, 3, ret_intr_type); + + trace_spapr_pci_rtas_ibm_change_msi(func, req_num); +} + +static void rtas_ibm_query_interrupt_source_number(sPAPREnvironment *spapr, + uint32_t token, + uint32_t nargs, + target_ulong args, + uint32_t nret, + target_ulong rets) +{ + uint32_t config_addr = rtas_ld(args, 0); + uint64_t buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); + unsigned int intr_src_num = -1, ioa_intr_num = rtas_ld(args, 3); + int ndev; + sPAPRPHBState *phb = NULL; + + /* Fins sPAPRPHBState */ + phb = find_phb(spapr, buid); + if (!phb) { + rtas_st(rets, 0, -3); /* Parameter error */ + return; + } + + /* Find device descriptor and start IRQ */ + ndev = spapr_msicfg_find(phb, config_addr, false); + if (ndev < 0) { + trace_spapr_pci_msi("MSI has not been enabled", -1, config_addr); + rtas_st(rets, 0, -1); /* Hardware error */ + return; + } + + intr_src_num = phb->msi_table[ndev].irq + ioa_intr_num; + trace_spapr_pci_rtas_ibm_query_interrupt_source_number(ioa_intr_num, + intr_src_num); + + rtas_st(rets, 0, 0); + rtas_st(rets, 1, intr_src_num); + rtas_st(rets, 2, 1);/* 0 == level; 1 == edge */ +} + static int pci_spapr_swizzle(int slot, int pin) { return (slot + pin) % PCI_NUM_PINS; @@ -277,6 +475,33 @@ static const MemoryRegionOps spapr_io_ops = { }; /* + * MSI/MSIX memory region implementation. + * The handler handles both MSI and MSIX. + * For MSI-X, the vector number is encoded as a part of the address, + * data is set to 0. + * For MSI, the vector number is encoded in least bits in data. + */ +static void spapr_msi_write(void *opaque, target_phys_addr_t addr, + uint64_t data, unsigned size) +{ + sPAPRPHBState *phb = opaque; + int ndev = addr >> 16; + int vec = ((addr & 0xFFFF) >> 2) | data; + uint32_t irq = phb->msi_table[ndev].irq + vec; + + trace_spapr_pci_msi_write(addr, data, irq); + + qemu_irq_pulse(xics_get_qirq(spapr->icp, irq)); +} + +static const MemoryRegionOps spapr_msi_ops = { + /* There is no .read as the read result is undefined by PCI spec */ + .read = NULL, + .write = spapr_msi_write, + .endianness = DEVICE_LITTLE_ENDIAN +}; + +/* * PHB PCI device */ static DMAContext *spapr_pci_dma_context_fn(PCIBus *bus, void *opaque, @@ -327,6 +552,17 @@ static int spapr_phb_init(SysBusDevice *s) memory_region_add_subregion(get_system_memory(), phb->io_win_addr, &phb->iowindow); + /* As MSI/MSIX interrupts trigger by writing at MSI/MSIX vectors, + * we need to allocate some memory to catch those writes coming + * from msi_notify()/msix_notify() */ + if (msi_supported) { + sprintf(namebuf, "%s.msi", phb->dtbusname); + memory_region_init_io(&phb->msiwindow, &spapr_msi_ops, phb, + namebuf, SPAPR_MSIX_MAX_DEVS * 0x10000); + memory_region_add_subregion(get_system_memory(), phb->msi_win_addr, + &phb->msiwindow); + } + bus = pci_register_bus(&phb->host_state.busdev.qdev, phb->busname ? phb->busname : phb->dtbusname, pci_spapr_set_irq, pci_spapr_map_irq, phb, @@ -362,6 +598,7 @@ static Property spapr_phb_properties[] = { DEFINE_PROP_HEX64("mem_win_size", sPAPRPHBState, mem_win_size, 0x20000000), DEFINE_PROP_HEX64("io_win_addr", sPAPRPHBState, io_win_addr, 0), DEFINE_PROP_HEX64("io_win_size", sPAPRPHBState, io_win_size, 0x10000), + DEFINE_PROP_HEX64("msi_win_addr", sPAPRPHBState, msi_win_addr, 0), DEFINE_PROP_END_OF_LIST(), }; @@ -384,7 +621,7 @@ static TypeInfo spapr_phb_info = { void spapr_create_phb(sPAPREnvironment *spapr, const char *busname, uint64_t buid, uint64_t mem_win_addr, uint64_t mem_win_size, - uint64_t io_win_addr) + uint64_t io_win_addr, uint64_t msi_win_addr) { DeviceState *dev; @@ -397,6 +634,7 @@ void spapr_create_phb(sPAPREnvironment *spapr, qdev_prop_set_uint64(dev, "mem_win_addr", mem_win_addr); qdev_prop_set_uint64(dev, "mem_win_size", mem_win_size); qdev_prop_set_uint64(dev, "io_win_addr", io_win_addr); + qdev_prop_set_uint64(dev, "msi_win_addr", msi_win_addr); qdev_init_nofail(dev); } @@ -502,6 +740,11 @@ void spapr_pci_rtas_init(void) spapr_rtas_register("write-pci-config", rtas_write_pci_config); spapr_rtas_register("ibm,read-pci-config", rtas_ibm_read_pci_config); spapr_rtas_register("ibm,write-pci-config", rtas_ibm_write_pci_config); + if (msi_supported) { + spapr_rtas_register("ibm,query-interrupt-source-number", + rtas_ibm_query_interrupt_source_number); + spapr_rtas_register("ibm,change-msi", rtas_ibm_change_msi); + } } static void register_types(void) |