diff options
Diffstat (limited to 'src/hw/xen/xen_pt_msi.c')
| -rw-r--r-- | src/hw/xen/xen_pt_msi.c | 644 |
1 files changed, 644 insertions, 0 deletions
diff --git a/src/hw/xen/xen_pt_msi.c b/src/hw/xen/xen_pt_msi.c new file mode 100644 index 0000000..82de2bc --- /dev/null +++ b/src/hw/xen/xen_pt_msi.c @@ -0,0 +1,644 @@ +/* + * Copyright (c) 2007, Intel Corporation. + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + * Jiang Yunhong <yunhong.jiang@intel.com> + * + * This file implements direct PCI assignment to a HVM guest + */ + +#include <sys/mman.h> + +#include "hw/xen/xen_backend.h" +#include "xen_pt.h" +#include "hw/i386/apic-msidef.h" + + +#define XEN_PT_AUTO_ASSIGN -1 + +/* shift count for gflags */ +#define XEN_PT_GFLAGS_SHIFT_DEST_ID 0 +#define XEN_PT_GFLAGS_SHIFT_RH 8 +#define XEN_PT_GFLAGS_SHIFT_DM 9 +#define XEN_PT_GFLAGSSHIFT_DELIV_MODE 12 +#define XEN_PT_GFLAGSSHIFT_TRG_MODE 15 + + +/* + * Helpers + */ + +static inline uint8_t msi_vector(uint32_t data) +{ + return (data & MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT; +} + +static inline uint8_t msi_dest_id(uint32_t addr) +{ + return (addr & MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT; +} + +static inline uint32_t msi_ext_dest_id(uint32_t addr_hi) +{ + return addr_hi & 0xffffff00; +} + +static uint32_t msi_gflags(uint32_t data, uint64_t addr) +{ + uint32_t result = 0; + int rh, dm, dest_id, deliv_mode, trig_mode; + + rh = (addr >> MSI_ADDR_REDIRECTION_SHIFT) & 0x1; + dm = (addr >> MSI_ADDR_DEST_MODE_SHIFT) & 0x1; + dest_id = msi_dest_id(addr); + deliv_mode = (data >> MSI_DATA_DELIVERY_MODE_SHIFT) & 0x7; + trig_mode = (data >> MSI_DATA_TRIGGER_SHIFT) & 0x1; + + result = dest_id | (rh << XEN_PT_GFLAGS_SHIFT_RH) + | (dm << XEN_PT_GFLAGS_SHIFT_DM) + | (deliv_mode << XEN_PT_GFLAGSSHIFT_DELIV_MODE) + | (trig_mode << XEN_PT_GFLAGSSHIFT_TRG_MODE); + + return result; +} + +static inline uint64_t msi_addr64(XenPTMSI *msi) +{ + return (uint64_t)msi->addr_hi << 32 | msi->addr_lo; +} + +static int msi_msix_enable(XenPCIPassthroughState *s, + uint32_t address, + uint16_t flag, + bool enable) +{ + uint16_t val = 0; + int rc; + + if (!address) { + return -1; + } + + rc = xen_host_pci_get_word(&s->real_device, address, &val); + if (rc) { + XEN_PT_ERR(&s->dev, "Failed to read MSI/MSI-X register (0x%x), rc:%d\n", + address, rc); + return rc; + } + if (enable) { + val |= flag; + } else { + val &= ~flag; + } + rc = xen_host_pci_set_word(&s->real_device, address, val); + if (rc) { + XEN_PT_ERR(&s->dev, "Failed to write MSI/MSI-X register (0x%x), rc:%d\n", + address, rc); + } + return rc; +} + +static int msi_msix_setup(XenPCIPassthroughState *s, + uint64_t addr, + uint32_t data, + int *ppirq, + bool is_msix, + int msix_entry, + bool is_not_mapped) +{ + uint8_t gvec = msi_vector(data); + int rc = 0; + + assert((!is_msix && msix_entry == 0) || is_msix); + + if (gvec == 0) { + /* if gvec is 0, the guest is asking for a particular pirq that + * is passed as dest_id */ + *ppirq = msi_ext_dest_id(addr >> 32) | msi_dest_id(addr); + if (!*ppirq) { + /* this probably identifies an misconfiguration of the guest, + * try the emulated path */ + *ppirq = XEN_PT_UNASSIGNED_PIRQ; + } else { + XEN_PT_LOG(&s->dev, "requested pirq %d for MSI%s" + " (vec: %#x, entry: %#x)\n", + *ppirq, is_msix ? "-X" : "", gvec, msix_entry); + } + } + + if (is_not_mapped) { + uint64_t table_base = 0; + + if (is_msix) { + table_base = s->msix->table_base; + } + + rc = xc_physdev_map_pirq_msi(xen_xc, xen_domid, XEN_PT_AUTO_ASSIGN, + ppirq, PCI_DEVFN(s->real_device.dev, + s->real_device.func), + s->real_device.bus, + msix_entry, table_base); + if (rc) { + XEN_PT_ERR(&s->dev, + "Mapping of MSI%s (err: %i, vec: %#x, entry %#x)\n", + is_msix ? "-X" : "", errno, gvec, msix_entry); + return rc; + } + } + + return 0; +} +static int msi_msix_update(XenPCIPassthroughState *s, + uint64_t addr, + uint32_t data, + int pirq, + bool is_msix, + int msix_entry, + int *old_pirq) +{ + PCIDevice *d = &s->dev; + uint8_t gvec = msi_vector(data); + uint32_t gflags = msi_gflags(data, addr); + int rc = 0; + uint64_t table_addr = 0; + + XEN_PT_LOG(d, "Updating MSI%s with pirq %d gvec %#x gflags %#x" + " (entry: %#x)\n", + is_msix ? "-X" : "", pirq, gvec, gflags, msix_entry); + + if (is_msix) { + table_addr = s->msix->mmio_base_addr; + } + + rc = xc_domain_update_msi_irq(xen_xc, xen_domid, gvec, + pirq, gflags, table_addr); + + if (rc) { + XEN_PT_ERR(d, "Updating of MSI%s failed. (err: %d)\n", + is_msix ? "-X" : "", errno); + + if (xc_physdev_unmap_pirq(xen_xc, xen_domid, *old_pirq)) { + XEN_PT_ERR(d, "Unmapping of MSI%s pirq %d failed. (err: %d)\n", + is_msix ? "-X" : "", *old_pirq, errno); + } + *old_pirq = XEN_PT_UNASSIGNED_PIRQ; + } + return rc; +} + +static int msi_msix_disable(XenPCIPassthroughState *s, + uint64_t addr, + uint32_t data, + int pirq, + bool is_msix, + bool is_binded) +{ + PCIDevice *d = &s->dev; + uint8_t gvec = msi_vector(data); + uint32_t gflags = msi_gflags(data, addr); + int rc = 0; + + if (pirq == XEN_PT_UNASSIGNED_PIRQ) { + return 0; + } + + if (is_binded) { + XEN_PT_LOG(d, "Unbind MSI%s with pirq %d, gvec %#x\n", + is_msix ? "-X" : "", pirq, gvec); + rc = xc_domain_unbind_msi_irq(xen_xc, xen_domid, gvec, pirq, gflags); + if (rc) { + XEN_PT_ERR(d, "Unbinding of MSI%s failed. (err: %d, pirq: %d, gvec: %#x)\n", + is_msix ? "-X" : "", errno, pirq, gvec); + return rc; + } + } + + XEN_PT_LOG(d, "Unmap MSI%s pirq %d\n", is_msix ? "-X" : "", pirq); + rc = xc_physdev_unmap_pirq(xen_xc, xen_domid, pirq); + if (rc) { + XEN_PT_ERR(d, "Unmapping of MSI%s pirq %d failed. (err: %i)\n", + is_msix ? "-X" : "", pirq, errno); + return rc; + } + + return 0; +} + +/* + * MSI virtualization functions + */ + +static int xen_pt_msi_set_enable(XenPCIPassthroughState *s, bool enable) +{ + XEN_PT_LOG(&s->dev, "%s MSI.\n", enable ? "enabling" : "disabling"); + + if (!s->msi) { + return -1; + } + + return msi_msix_enable(s, s->msi->ctrl_offset, PCI_MSI_FLAGS_ENABLE, + enable); +} + +/* setup physical msi, but don't enable it */ +int xen_pt_msi_setup(XenPCIPassthroughState *s) +{ + int pirq = XEN_PT_UNASSIGNED_PIRQ; + int rc = 0; + XenPTMSI *msi = s->msi; + + if (msi->initialized) { + XEN_PT_ERR(&s->dev, + "Setup physical MSI when it has been properly initialized.\n"); + return -1; + } + + rc = msi_msix_setup(s, msi_addr64(msi), msi->data, &pirq, false, 0, true); + if (rc) { + return rc; + } + + if (pirq < 0) { + XEN_PT_ERR(&s->dev, "Invalid pirq number: %d.\n", pirq); + return -1; + } + + msi->pirq = pirq; + XEN_PT_LOG(&s->dev, "MSI mapped with pirq %d.\n", pirq); + + return 0; +} + +int xen_pt_msi_update(XenPCIPassthroughState *s) +{ + XenPTMSI *msi = s->msi; + return msi_msix_update(s, msi_addr64(msi), msi->data, msi->pirq, + false, 0, &msi->pirq); +} + +void xen_pt_msi_disable(XenPCIPassthroughState *s) +{ + XenPTMSI *msi = s->msi; + + if (!msi) { + return; + } + + (void)xen_pt_msi_set_enable(s, false); + + msi_msix_disable(s, msi_addr64(msi), msi->data, msi->pirq, false, + msi->initialized); + + /* clear msi info */ + msi->flags &= ~PCI_MSI_FLAGS_ENABLE; + msi->initialized = false; + msi->mapped = false; + msi->pirq = XEN_PT_UNASSIGNED_PIRQ; +} + +/* + * MSI-X virtualization functions + */ + +static int msix_set_enable(XenPCIPassthroughState *s, bool enabled) +{ + XEN_PT_LOG(&s->dev, "%s MSI-X.\n", enabled ? "enabling" : "disabling"); + + if (!s->msix) { + return -1; + } + + return msi_msix_enable(s, s->msix->ctrl_offset, PCI_MSIX_FLAGS_ENABLE, + enabled); +} + +static int xen_pt_msix_update_one(XenPCIPassthroughState *s, int entry_nr) +{ + XenPTMSIXEntry *entry = NULL; + int pirq; + int rc; + + if (entry_nr < 0 || entry_nr >= s->msix->total_entries) { + return -EINVAL; + } + + entry = &s->msix->msix_entry[entry_nr]; + + if (!entry->updated) { + return 0; + } + + pirq = entry->pirq; + + rc = msi_msix_setup(s, entry->addr, entry->data, &pirq, true, entry_nr, + entry->pirq == XEN_PT_UNASSIGNED_PIRQ); + if (rc) { + return rc; + } + if (entry->pirq == XEN_PT_UNASSIGNED_PIRQ) { + entry->pirq = pirq; + } + + rc = msi_msix_update(s, entry->addr, entry->data, pirq, true, + entry_nr, &entry->pirq); + + if (!rc) { + entry->updated = false; + } + + return rc; +} + +int xen_pt_msix_update(XenPCIPassthroughState *s) +{ + XenPTMSIX *msix = s->msix; + int i; + + for (i = 0; i < msix->total_entries; i++) { + xen_pt_msix_update_one(s, i); + } + + return 0; +} + +void xen_pt_msix_disable(XenPCIPassthroughState *s) +{ + int i = 0; + + msix_set_enable(s, false); + + for (i = 0; i < s->msix->total_entries; i++) { + XenPTMSIXEntry *entry = &s->msix->msix_entry[i]; + + msi_msix_disable(s, entry->addr, entry->data, entry->pirq, true, true); + + /* clear MSI-X info */ + entry->pirq = XEN_PT_UNASSIGNED_PIRQ; + entry->updated = false; + } +} + +int xen_pt_msix_update_remap(XenPCIPassthroughState *s, int bar_index) +{ + XenPTMSIXEntry *entry; + int i, ret; + + if (!(s->msix && s->msix->bar_index == bar_index)) { + return 0; + } + + for (i = 0; i < s->msix->total_entries; i++) { + entry = &s->msix->msix_entry[i]; + if (entry->pirq != XEN_PT_UNASSIGNED_PIRQ) { + ret = xc_domain_unbind_pt_irq(xen_xc, xen_domid, entry->pirq, + PT_IRQ_TYPE_MSI, 0, 0, 0, 0); + if (ret) { + XEN_PT_ERR(&s->dev, "unbind MSI-X entry %d failed (err: %d)\n", + entry->pirq, errno); + } + entry->updated = true; + } + } + return xen_pt_msix_update(s); +} + +static uint32_t get_entry_value(XenPTMSIXEntry *e, int offset) +{ + switch (offset) { + case PCI_MSIX_ENTRY_LOWER_ADDR: + return e->addr & UINT32_MAX; + case PCI_MSIX_ENTRY_UPPER_ADDR: + return e->addr >> 32; + case PCI_MSIX_ENTRY_DATA: + return e->data; + case PCI_MSIX_ENTRY_VECTOR_CTRL: + return e->vector_ctrl; + default: + return 0; + } +} + +static void set_entry_value(XenPTMSIXEntry *e, int offset, uint32_t val) +{ + switch (offset) { + case PCI_MSIX_ENTRY_LOWER_ADDR: + e->addr = (e->addr & ((uint64_t)UINT32_MAX << 32)) | val; + break; + case PCI_MSIX_ENTRY_UPPER_ADDR: + e->addr = (uint64_t)val << 32 | (e->addr & UINT32_MAX); + break; + case PCI_MSIX_ENTRY_DATA: + e->data = val; + break; + case PCI_MSIX_ENTRY_VECTOR_CTRL: + e->vector_ctrl = val; + break; + } +} + +static void pci_msix_write(void *opaque, hwaddr addr, + uint64_t val, unsigned size) +{ + XenPCIPassthroughState *s = opaque; + XenPTMSIX *msix = s->msix; + XenPTMSIXEntry *entry; + unsigned int entry_nr, offset; + + entry_nr = addr / PCI_MSIX_ENTRY_SIZE; + if (entry_nr >= msix->total_entries) { + return; + } + entry = &msix->msix_entry[entry_nr]; + offset = addr % PCI_MSIX_ENTRY_SIZE; + + if (offset != PCI_MSIX_ENTRY_VECTOR_CTRL) { + const volatile uint32_t *vec_ctrl; + + if (get_entry_value(entry, offset) == val + && entry->pirq != XEN_PT_UNASSIGNED_PIRQ) { + return; + } + + /* + * If Xen intercepts the mask bit access, entry->vec_ctrl may not be + * up-to-date. Read from hardware directly. + */ + vec_ctrl = s->msix->phys_iomem_base + entry_nr * PCI_MSIX_ENTRY_SIZE + + PCI_MSIX_ENTRY_VECTOR_CTRL; + + if (msix->enabled && !(*vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT)) { + if (!entry->warned) { + entry->warned = true; + XEN_PT_ERR(&s->dev, "Can't update msix entry %d since MSI-X is" + " already enabled.\n", entry_nr); + } + return; + } + + entry->updated = true; + } + + set_entry_value(entry, offset, val); + + if (offset == PCI_MSIX_ENTRY_VECTOR_CTRL) { + if (msix->enabled && !(val & PCI_MSIX_ENTRY_CTRL_MASKBIT)) { + xen_pt_msix_update_one(s, entry_nr); + } + } +} + +static uint64_t pci_msix_read(void *opaque, hwaddr addr, + unsigned size) +{ + XenPCIPassthroughState *s = opaque; + XenPTMSIX *msix = s->msix; + int entry_nr, offset; + + entry_nr = addr / PCI_MSIX_ENTRY_SIZE; + if (entry_nr < 0) { + XEN_PT_ERR(&s->dev, "asked MSI-X entry '%i' invalid!\n", entry_nr); + return 0; + } + + offset = addr % PCI_MSIX_ENTRY_SIZE; + + if (addr < msix->total_entries * PCI_MSIX_ENTRY_SIZE) { + return get_entry_value(&msix->msix_entry[entry_nr], offset); + } else { + /* Pending Bit Array (PBA) */ + return *(uint32_t *)(msix->phys_iomem_base + addr); + } +} + +static const MemoryRegionOps pci_msix_ops = { + .read = pci_msix_read, + .write = pci_msix_write, + .endianness = DEVICE_NATIVE_ENDIAN, + .valid = { + .min_access_size = 4, + .max_access_size = 4, + .unaligned = false, + }, +}; + +int xen_pt_msix_init(XenPCIPassthroughState *s, uint32_t base) +{ + uint8_t id = 0; + uint16_t control = 0; + uint32_t table_off = 0; + int i, total_entries, bar_index; + XenHostPCIDevice *hd = &s->real_device; + PCIDevice *d = &s->dev; + int fd = -1; + XenPTMSIX *msix = NULL; + int rc = 0; + + rc = xen_host_pci_get_byte(hd, base + PCI_CAP_LIST_ID, &id); + if (rc) { + return rc; + } + + if (id != PCI_CAP_ID_MSIX) { + XEN_PT_ERR(d, "Invalid id %#x base %#x\n", id, base); + return -1; + } + + xen_host_pci_get_word(hd, base + PCI_MSIX_FLAGS, &control); + total_entries = control & PCI_MSIX_FLAGS_QSIZE; + total_entries += 1; + + s->msix = g_malloc0(sizeof (XenPTMSIX) + + total_entries * sizeof (XenPTMSIXEntry)); + msix = s->msix; + + msix->total_entries = total_entries; + for (i = 0; i < total_entries; i++) { + msix->msix_entry[i].pirq = XEN_PT_UNASSIGNED_PIRQ; + } + + memory_region_init_io(&msix->mmio, OBJECT(s), &pci_msix_ops, + s, "xen-pci-pt-msix", + (total_entries * PCI_MSIX_ENTRY_SIZE + + XC_PAGE_SIZE - 1) + & XC_PAGE_MASK); + + xen_host_pci_get_long(hd, base + PCI_MSIX_TABLE, &table_off); + bar_index = msix->bar_index = table_off & PCI_MSIX_FLAGS_BIRMASK; + table_off = table_off & ~PCI_MSIX_FLAGS_BIRMASK; + msix->table_base = s->real_device.io_regions[bar_index].base_addr; + XEN_PT_LOG(d, "get MSI-X table BAR base 0x%"PRIx64"\n", msix->table_base); + + fd = open("/dev/mem", O_RDWR); + if (fd == -1) { + rc = -errno; + XEN_PT_ERR(d, "Can't open /dev/mem: %s\n", strerror(errno)); + goto error_out; + } + XEN_PT_LOG(d, "table_off = %#x, total_entries = %d\n", + table_off, total_entries); + msix->table_offset_adjust = table_off & 0x0fff; + msix->phys_iomem_base = + mmap(NULL, + total_entries * PCI_MSIX_ENTRY_SIZE + msix->table_offset_adjust, + PROT_READ, + MAP_SHARED | MAP_LOCKED, + fd, + msix->table_base + table_off - msix->table_offset_adjust); + close(fd); + if (msix->phys_iomem_base == MAP_FAILED) { + rc = -errno; + XEN_PT_ERR(d, "Can't map physical MSI-X table: %s\n", strerror(errno)); + goto error_out; + } + msix->phys_iomem_base = (char *)msix->phys_iomem_base + + msix->table_offset_adjust; + + XEN_PT_LOG(d, "mapping physical MSI-X table to %p\n", + msix->phys_iomem_base); + + memory_region_add_subregion_overlap(&s->bar[bar_index], table_off, + &msix->mmio, + 2); /* Priority: pci default + 1 */ + + return 0; + +error_out: + g_free(s->msix); + s->msix = NULL; + return rc; +} + +void xen_pt_msix_unmap(XenPCIPassthroughState *s) +{ + XenPTMSIX *msix = s->msix; + + if (!msix) { + return; + } + + /* unmap the MSI-X memory mapped register area */ + if (msix->phys_iomem_base) { + XEN_PT_LOG(&s->dev, "unmapping physical MSI-X table from %p\n", + msix->phys_iomem_base); + munmap(msix->phys_iomem_base, msix->total_entries * PCI_MSIX_ENTRY_SIZE + + msix->table_offset_adjust); + } + + memory_region_del_subregion(&s->bar[msix->bar_index], &msix->mmio); +} + +void xen_pt_msix_delete(XenPCIPassthroughState *s) +{ + XenPTMSIX *msix = s->msix; + + if (!msix) { + return; + } + + object_unparent(OBJECT(&msix->mmio)); + + g_free(s->msix); + s->msix = NULL; +} |
