aboutsummaryrefslogtreecommitdiff
path: root/hw/spapr_pci.c
diff options
context:
space:
mode:
Diffstat (limited to 'hw/spapr_pci.c')
-rw-r--r--hw/spapr_pci.c508
1 files changed, 508 insertions, 0 deletions
diff --git a/hw/spapr_pci.c b/hw/spapr_pci.c
new file mode 100644
index 0000000000..2a5e6374c3
--- /dev/null
+++ b/hw/spapr_pci.c
@@ -0,0 +1,508 @@
+/*
+ * QEMU sPAPR PCI host originated from Uninorth PCI host
+ *
+ * Copyright (c) 2011 Alexey Kardashevskiy, IBM Corporation.
+ * Copyright (C) 2011 David Gibson, IBM Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "hw.h"
+#include "pci.h"
+#include "pci_host.h"
+#include "hw/spapr.h"
+#include "hw/spapr_pci.h"
+#include "exec-memory.h"
+#include <libfdt.h>
+
+#include "hw/pci_internals.h"
+
+static const uint32_t bars[] = {
+ PCI_BASE_ADDRESS_0, PCI_BASE_ADDRESS_1,
+ PCI_BASE_ADDRESS_2, PCI_BASE_ADDRESS_3,
+ PCI_BASE_ADDRESS_4, PCI_BASE_ADDRESS_5
+ /*, PCI_ROM_ADDRESS*/
+};
+
+static PCIDevice *find_dev(sPAPREnvironment *spapr,
+ uint64_t buid, uint32_t config_addr)
+{
+ DeviceState *qdev;
+ int devfn = (config_addr >> 8) & 0xFF;
+ sPAPRPHBState *phb;
+
+ QLIST_FOREACH(phb, &spapr->phbs, list) {
+ if (phb->buid != buid) {
+ continue;
+ }
+
+ QLIST_FOREACH(qdev, &phb->host_state.bus->qbus.children, sibling) {
+ PCIDevice *dev = (PCIDevice *)qdev;
+ if (dev->devfn == devfn) {
+ return dev;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+static void rtas_ibm_read_pci_config(sPAPREnvironment *spapr,
+ uint32_t token, uint32_t nargs,
+ target_ulong args,
+ uint32_t nret, target_ulong rets)
+{
+ uint32_t val, size, addr;
+ uint64_t buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
+ PCIDevice *dev = find_dev(spapr, buid, rtas_ld(args, 0));
+
+ if (!dev) {
+ rtas_st(rets, 0, -1);
+ return;
+ }
+ size = rtas_ld(args, 3);
+ addr = rtas_ld(args, 0) & 0xFF;
+ val = pci_default_read_config(dev, addr, size);
+ rtas_st(rets, 0, 0);
+ rtas_st(rets, 1, val);
+}
+
+static void rtas_read_pci_config(sPAPREnvironment *spapr,
+ uint32_t token, uint32_t nargs,
+ target_ulong args,
+ uint32_t nret, target_ulong rets)
+{
+ uint32_t val, size, addr;
+ PCIDevice *dev = find_dev(spapr, 0, rtas_ld(args, 0));
+
+ if (!dev) {
+ rtas_st(rets, 0, -1);
+ return;
+ }
+ size = rtas_ld(args, 1);
+ addr = rtas_ld(args, 0) & 0xFF;
+ val = pci_default_read_config(dev, addr, size);
+ rtas_st(rets, 0, 0);
+ rtas_st(rets, 1, val);
+}
+
+static void rtas_ibm_write_pci_config(sPAPREnvironment *spapr,
+ uint32_t token, uint32_t nargs,
+ target_ulong args,
+ uint32_t nret, target_ulong rets)
+{
+ uint32_t val, size, addr;
+ uint64_t buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
+ PCIDevice *dev = find_dev(spapr, buid, rtas_ld(args, 0));
+
+ if (!dev) {
+ rtas_st(rets, 0, -1);
+ return;
+ }
+ val = rtas_ld(args, 4);
+ size = rtas_ld(args, 3);
+ addr = rtas_ld(args, 0) & 0xFF;
+ pci_default_write_config(dev, addr, val, size);
+ rtas_st(rets, 0, 0);
+}
+
+static void rtas_write_pci_config(sPAPREnvironment *spapr,
+ uint32_t token, uint32_t nargs,
+ target_ulong args,
+ uint32_t nret, target_ulong rets)
+{
+ uint32_t val, size, addr;
+ PCIDevice *dev = find_dev(spapr, 0, rtas_ld(args, 0));
+
+ if (!dev) {
+ rtas_st(rets, 0, -1);
+ return;
+ }
+ val = rtas_ld(args, 2);
+ size = rtas_ld(args, 1);
+ addr = rtas_ld(args, 0) & 0xFF;
+ pci_default_write_config(dev, addr, val, size);
+ rtas_st(rets, 0, 0);
+}
+
+static int pci_spapr_map_irq(PCIDevice *pci_dev, int irq_num)
+{
+ /*
+ * Here we need to convert pci_dev + irq_num to some unique value
+ * which is less than number of IRQs on the specific bus (now it
+ * is 16). At the moment irq_num == device_id (number of the
+ * slot?)
+ * FIXME: we should swizzle in fn and irq_num
+ */
+ return (pci_dev->devfn >> 3) % SPAPR_PCI_NUM_LSI;
+}
+
+static void pci_spapr_set_irq(void *opaque, int irq_num, int level)
+{
+ /*
+ * Here we use the number returned by pci_spapr_map_irq to find a
+ * corresponding qemu_irq.
+ */
+ sPAPRPHBState *phb = opaque;
+
+ qemu_set_irq(phb->lsi_table[irq_num].qirq, level);
+}
+
+static int spapr_phb_init(SysBusDevice *s)
+{
+ sPAPRPHBState *phb = FROM_SYSBUS(sPAPRPHBState, s);
+ int i;
+
+ /* Initialize the LSI table */
+ for (i = 0; i < SPAPR_PCI_NUM_LSI; i++) {
+ qemu_irq qirq;
+ uint32_t num;
+
+ qirq = spapr_allocate_irq(0, &num);
+ if (!qirq) {
+ return -1;
+ }
+
+ phb->lsi_table[i].dt_irq = num;
+ phb->lsi_table[i].qirq = qirq;
+ }
+
+ return 0;
+}
+
+static int spapr_main_pci_host_init(PCIDevice *d)
+{
+ return 0;
+}
+
+static PCIDeviceInfo spapr_main_pci_host_info = {
+ .qdev.name = "spapr-pci-host-bridge",
+ .qdev.size = sizeof(PCIDevice),
+ .init = spapr_main_pci_host_init,
+};
+
+static void spapr_register_devices(void)
+{
+ sysbus_register_dev("spapr-pci-host-bridge", sizeof(sPAPRPHBState),
+ spapr_phb_init);
+ pci_qdev_register(&spapr_main_pci_host_info);
+}
+
+device_init(spapr_register_devices)
+
+static uint64_t spapr_io_read(void *opaque, target_phys_addr_t addr,
+ unsigned size)
+{
+ switch (size) {
+ case 1:
+ return cpu_inb(addr);
+ case 2:
+ return cpu_inw(addr);
+ case 4:
+ return cpu_inl(addr);
+ }
+ assert(0);
+}
+
+static void spapr_io_write(void *opaque, target_phys_addr_t addr,
+ uint64_t data, unsigned size)
+{
+ switch (size) {
+ case 1:
+ cpu_outb(addr, data);
+ return;
+ case 2:
+ cpu_outw(addr, data);
+ return;
+ case 4:
+ cpu_outl(addr, data);
+ return;
+ }
+ assert(0);
+}
+
+static MemoryRegionOps spapr_io_ops = {
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .read = spapr_io_read,
+ .write = spapr_io_write
+};
+
+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)
+{
+ DeviceState *dev;
+ SysBusDevice *s;
+ sPAPRPHBState *phb;
+ PCIBus *bus;
+ char namebuf[strlen(busname)+11];
+
+ dev = qdev_create(NULL, "spapr-pci-host-bridge");
+ qdev_init_nofail(dev);
+ s = sysbus_from_qdev(dev);
+ phb = FROM_SYSBUS(sPAPRPHBState, s);
+
+ phb->mem_win_addr = mem_win_addr;
+
+ sprintf(namebuf, "%s-mem", busname);
+ memory_region_init(&phb->memspace, namebuf, INT64_MAX);
+
+ sprintf(namebuf, "%s-memwindow", busname);
+ memory_region_init_alias(&phb->memwindow, namebuf, &phb->memspace,
+ SPAPR_PCI_MEM_WIN_BUS_OFFSET, mem_win_size);
+ memory_region_add_subregion(get_system_memory(), mem_win_addr,
+ &phb->memwindow);
+
+ phb->io_win_addr = io_win_addr;
+
+ /* On ppc, we only have MMIO no specific IO space from the CPU
+ * perspective. In theory we ought to be able to embed the PCI IO
+ * memory region direction in the system memory space. However,
+ * if any of the IO BAR subregions use the old_portio mechanism,
+ * that won't be processed properly unless accessed from the
+ * system io address space. This hack to bounce things via
+ * system_io works around the problem until all the users of
+ * old_portion are updated */
+ sprintf(namebuf, "%s-io", busname);
+ memory_region_init(&phb->iospace, namebuf, SPAPR_PCI_IO_WIN_SIZE);
+ /* FIXME: fix to support multiple PHBs */
+ memory_region_add_subregion(get_system_io(), 0, &phb->iospace);
+
+ sprintf(namebuf, "%s-iowindow", busname);
+ memory_region_init_io(&phb->iowindow, &spapr_io_ops, phb,
+ namebuf, SPAPR_PCI_IO_WIN_SIZE);
+ memory_region_add_subregion(get_system_memory(), io_win_addr,
+ &phb->iowindow);
+
+ phb->host_state.bus = bus = pci_register_bus(&phb->busdev.qdev, busname,
+ pci_spapr_set_irq,
+ pci_spapr_map_irq,
+ phb,
+ &phb->memspace, &phb->iospace,
+ PCI_DEVFN(0, 0),
+ SPAPR_PCI_NUM_LSI);
+
+ spapr_rtas_register("read-pci-config", rtas_read_pci_config);
+ 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);
+
+ QLIST_INSERT_HEAD(&spapr->phbs, phb, list);
+
+ /* pci_bus_set_mem_base(bus, mem_va_start - SPAPR_PCI_MEM_BAR_START); */
+}
+
+/* Macros to operate with address in OF binding to PCI */
+#define b_x(x, p, l) (((x) & ((1<<(l))-1)) << (p))
+#define b_n(x) b_x((x), 31, 1) /* 0 if relocatable */
+#define b_p(x) b_x((x), 30, 1) /* 1 if prefetchable */
+#define b_t(x) b_x((x), 29, 1) /* 1 if the address is aliased */
+#define b_ss(x) b_x((x), 24, 2) /* the space code */
+#define b_bbbbbbbb(x) b_x((x), 16, 8) /* bus number */
+#define b_ddddd(x) b_x((x), 11, 5) /* device number */
+#define b_fff(x) b_x((x), 8, 3) /* function number */
+#define b_rrrrrrrr(x) b_x((x), 0, 8) /* register number */
+
+static uint32_t regtype_to_ss(uint8_t type)
+{
+ if (type & PCI_BASE_ADDRESS_MEM_TYPE_64) {
+ return 3;
+ }
+ if (type == PCI_BASE_ADDRESS_SPACE_IO) {
+ return 1;
+ }
+ return 2;
+}
+
+int spapr_populate_pci_devices(sPAPRPHBState *phb,
+ uint32_t xics_phandle,
+ void *fdt)
+{
+ PCIBus *bus = phb->host_state.bus;
+ int bus_off, node_off = 0, devid, fn, i, n, devices;
+ DeviceState *qdev;
+ char nodename[256];
+ struct {
+ uint32_t hi;
+ uint64_t addr;
+ uint64_t size;
+ } __attribute__((packed)) reg[PCI_NUM_REGIONS + 1],
+ assigned_addresses[PCI_NUM_REGIONS];
+ uint32_t bus_range[] = { cpu_to_be32(0), cpu_to_be32(0xff) };
+ struct {
+ uint32_t hi;
+ uint64_t child;
+ uint64_t parent;
+ uint64_t size;
+ } __attribute__((packed)) ranges[] = {
+ {
+ cpu_to_be32(b_ss(1)), cpu_to_be64(0),
+ cpu_to_be64(phb->io_win_addr),
+ cpu_to_be64(memory_region_size(&phb->iospace)),
+ },
+ {
+ cpu_to_be32(b_ss(2)), cpu_to_be64(SPAPR_PCI_MEM_WIN_BUS_OFFSET),
+ cpu_to_be64(phb->mem_win_addr),
+ cpu_to_be64(memory_region_size(&phb->memwindow)),
+ },
+ };
+ uint64_t bus_reg[] = { cpu_to_be64(phb->buid), 0 };
+ uint32_t interrupt_map_mask[] = {
+ cpu_to_be32(b_ddddd(-1)|b_fff(-1)), 0x0, 0x0, 0x0};
+ uint32_t interrupt_map[bus->nirq][7];
+
+ /* Start populating the FDT */
+ sprintf(nodename, "pci@%" PRIx64, phb->buid);
+ bus_off = fdt_add_subnode(fdt, 0, nodename);
+ if (bus_off < 0) {
+ return bus_off;
+ }
+
+#define _FDT(exp) \
+ do { \
+ int ret = (exp); \
+ if (ret < 0) { \
+ return ret; \
+ } \
+ } while (0)
+
+ /* Write PHB properties */
+ _FDT(fdt_setprop_string(fdt, bus_off, "device_type", "pci"));
+ _FDT(fdt_setprop_string(fdt, bus_off, "compatible", "IBM,Logical_PHB"));
+ _FDT(fdt_setprop_cell(fdt, bus_off, "#address-cells", 0x3));
+ _FDT(fdt_setprop_cell(fdt, bus_off, "#size-cells", 0x2));
+ _FDT(fdt_setprop_cell(fdt, bus_off, "#interrupt-cells", 0x1));
+ _FDT(fdt_setprop(fdt, bus_off, "used-by-rtas", NULL, 0));
+ _FDT(fdt_setprop(fdt, bus_off, "bus-range", &bus_range, sizeof(bus_range)));
+ _FDT(fdt_setprop(fdt, bus_off, "ranges", &ranges, sizeof(ranges)));
+ _FDT(fdt_setprop(fdt, bus_off, "reg", &bus_reg, sizeof(bus_reg)));
+ _FDT(fdt_setprop(fdt, bus_off, "interrupt-map-mask",
+ &interrupt_map_mask, sizeof(interrupt_map_mask)));
+
+ /* Populate PCI devices and allocate IRQs */
+ devices = 0;
+ QLIST_FOREACH(qdev, &bus->qbus.children, sibling) {
+ PCIDevice *dev = DO_UPCAST(PCIDevice, qdev, qdev);
+ int irq_index = pci_spapr_map_irq(dev, 0);
+ uint32_t *irqmap = interrupt_map[devices];
+ uint8_t *config = dev->config;
+
+ devid = dev->devfn >> 3;
+ fn = dev->devfn & 7;
+
+ sprintf(nodename, "pci@%u,%u", devid, fn);
+
+ /* Allocate interrupt from the map */
+ if (devid > bus->nirq) {
+ printf("Unexpected behaviour in spapr_populate_pci_devices,"
+ "wrong devid %u\n", devid);
+ exit(-1);
+ }
+ irqmap[0] = cpu_to_be32(b_ddddd(devid)|b_fff(fn));
+ irqmap[1] = 0;
+ irqmap[2] = 0;
+ irqmap[3] = 0;
+ irqmap[4] = cpu_to_be32(xics_phandle);
+ irqmap[5] = cpu_to_be32(phb->lsi_table[irq_index].dt_irq);
+ irqmap[6] = cpu_to_be32(0x8);
+
+ /* Add node to FDT */
+ node_off = fdt_add_subnode(fdt, bus_off, nodename);
+ if (node_off < 0) {
+ return node_off;
+ }
+
+ _FDT(fdt_setprop_cell(fdt, node_off, "vendor-id",
+ pci_get_word(&config[PCI_VENDOR_ID])));
+ _FDT(fdt_setprop_cell(fdt, node_off, "device-id",
+ pci_get_word(&config[PCI_DEVICE_ID])));
+ _FDT(fdt_setprop_cell(fdt, node_off, "revision-id",
+ pci_get_byte(&config[PCI_REVISION_ID])));
+ _FDT(fdt_setprop_cell(fdt, node_off, "class-code",
+ pci_get_long(&config[PCI_CLASS_REVISION]) >> 8));
+ _FDT(fdt_setprop_cell(fdt, node_off, "subsystem-id",
+ pci_get_word(&config[PCI_SUBSYSTEM_ID])));
+ _FDT(fdt_setprop_cell(fdt, node_off, "subsystem-vendor-id",
+ pci_get_word(&config[PCI_SUBSYSTEM_VENDOR_ID])));
+
+ /* Config space region comes first */
+ reg[0].hi = cpu_to_be32(
+ b_n(0) |
+ b_p(0) |
+ b_t(0) |
+ b_ss(0/*config*/) |
+ b_bbbbbbbb(0) |
+ b_ddddd(devid) |
+ b_fff(fn));
+ reg[0].addr = 0;
+ reg[0].size = 0;
+
+ n = 0;
+ for (i = 0; i < PCI_NUM_REGIONS; ++i) {
+ if (0 == dev->io_regions[i].size) {
+ continue;
+ }
+
+ reg[n+1].hi = cpu_to_be32(
+ b_n(0) |
+ b_p(0) |
+ b_t(0) |
+ b_ss(regtype_to_ss(dev->io_regions[i].type)) |
+ b_bbbbbbbb(0) |
+ b_ddddd(devid) |
+ b_fff(fn) |
+ b_rrrrrrrr(bars[i]));
+ reg[n+1].addr = 0;
+ reg[n+1].size = cpu_to_be64(dev->io_regions[i].size);
+
+ assigned_addresses[n].hi = cpu_to_be32(
+ b_n(1) |
+ b_p(0) |
+ b_t(0) |
+ b_ss(regtype_to_ss(dev->io_regions[i].type)) |
+ b_bbbbbbbb(0) |
+ b_ddddd(devid) |
+ b_fff(fn) |
+ b_rrrrrrrr(bars[i]));
+
+ /*
+ * Writing zeroes to assigned_addresses causes the guest kernel to
+ * reassign BARs
+ */
+ assigned_addresses[n].addr = cpu_to_be64(dev->io_regions[i].addr);
+ assigned_addresses[n].size = reg[n+1].size;
+
+ ++n;
+ }
+ _FDT(fdt_setprop(fdt, node_off, "reg", reg, sizeof(reg[0])*(n+1)));
+ _FDT(fdt_setprop(fdt, node_off, "assigned-addresses",
+ assigned_addresses,
+ sizeof(assigned_addresses[0])*(n)));
+ _FDT(fdt_setprop_cell(fdt, node_off, "interrupts",
+ pci_get_byte(&config[PCI_INTERRUPT_PIN])));
+
+ ++devices;
+ }
+
+ /* Write interrupt map */
+ _FDT(fdt_setprop(fdt, bus_off, "interrupt-map", &interrupt_map,
+ devices * sizeof(interrupt_map[0])));
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-22 19:27:58 +0000