[qemu.git] / hw / xen / xen_pt_msi.c

/*
 * 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_delete(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);

    g_free(s->msix);
    s->msix = NULL;
}
Commit	Line	Data
3854ca57 JY	1	/*
	2	* Copyright (c) 2007, Intel Corporation.
	3	*
	4	* This work is licensed under the terms of the GNU GPL, version 2. See
	5	* the COPYING file in the top-level directory.
	6	*
	7	* Jiang Yunhong <yunhong.jiang@intel.com>
	8	*
	9	* This file implements direct PCI assignment to a HVM guest
	10	*/
	11
	12	#include <sys/mman.h>
	13
0d09e41a	14	#include "hw/xen/xen_backend.h"
47b43a1f	15	#include "xen_pt.h"
0d09e41a	16	#include "hw/i386/apic-msidef.h"
3854ca57 JY	17
	18
	19	#define XEN_PT_AUTO_ASSIGN -1
	20
	21	/* shift count for gflags */
	22	#define XEN_PT_GFLAGS_SHIFT_DEST_ID 0
	23	#define XEN_PT_GFLAGS_SHIFT_RH 8
	24	#define XEN_PT_GFLAGS_SHIFT_DM 9
	25	#define XEN_PT_GFLAGSSHIFT_DELIV_MODE 12
	26	#define XEN_PT_GFLAGSSHIFT_TRG_MODE 15
	27
	28
	29	/*
	30	* Helpers
	31	*/
	32
	33	static inline uint8_t msi_vector(uint32_t data)
	34	{
	35	return (data & MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
	36	}
	37
	38	static inline uint8_t msi_dest_id(uint32_t addr)
	39	{
	40	return (addr & MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
	41	}
	42
	43	static inline uint32_t msi_ext_dest_id(uint32_t addr_hi)
	44	{
	45	return addr_hi & 0xffffff00;
	46	}
	47
	48	static uint32_t msi_gflags(uint32_t data, uint64_t addr)
	49	{
	50	uint32_t result = 0;
	51	int rh, dm, dest_id, deliv_mode, trig_mode;
	52
	53	rh = (addr >> MSI_ADDR_REDIRECTION_SHIFT) & 0x1;
	54	dm = (addr >> MSI_ADDR_DEST_MODE_SHIFT) & 0x1;
	55	dest_id = msi_dest_id(addr);
	56	deliv_mode = (data >> MSI_DATA_DELIVERY_MODE_SHIFT) & 0x7;
	57	trig_mode = (data >> MSI_DATA_TRIGGER_SHIFT) & 0x1;
	58
	59	result = dest_id \| (rh << XEN_PT_GFLAGS_SHIFT_RH)
	60	\| (dm << XEN_PT_GFLAGS_SHIFT_DM)
	61	\| (deliv_mode << XEN_PT_GFLAGSSHIFT_DELIV_MODE)
	62	\| (trig_mode << XEN_PT_GFLAGSSHIFT_TRG_MODE);
	63
	64	return result;
	65	}
	66
	67	static inline uint64_t msi_addr64(XenPTMSI *msi)
	68	{
	69	return (uint64_t)msi->addr_hi << 32 \| msi->addr_lo;
	70	}
	71
	72	static int msi_msix_enable(XenPCIPassthroughState *s,
	73	uint32_t address,
	74	uint16_t flag,
	75	bool enable)
	76	{
	77	uint16_t val = 0;
fe2da64c	78	int rc;
3854ca57 JY	79
	80	if (!address) {
	81	return -1;
	82	}
	83
fe2da64c KRW	84	rc = xen_host_pci_get_word(&s->real_device, address, &val);
	85	if (rc) {
	86	XEN_PT_ERR(&s->dev, "Failed to read MSI/MSI-X register (0x%x), rc:%d\n",
	87	address, rc);
	88	return rc;
	89	}
3854ca57 JY	90	if (enable) {
	91	val \|= flag;
	92	} else {
	93	val &= ~flag;
	94	}
fe2da64c KRW	95	rc = xen_host_pci_set_word(&s->real_device, address, val);
	96	if (rc) {
	97	XEN_PT_ERR(&s->dev, "Failed to write MSI/MSI-X register (0x%x), rc:%d\n",
	98	address, rc);
	99	}
	100	return rc;
3854ca57 JY	101	}
	102
	103	static int msi_msix_setup(XenPCIPassthroughState *s,
	104	uint64_t addr,
	105	uint32_t data,
	106	int *ppirq,
	107	bool is_msix,
	108	int msix_entry,
	109	bool is_not_mapped)
	110	{
	111	uint8_t gvec = msi_vector(data);
	112	int rc = 0;
	113
	114	assert((!is_msix && msix_entry == 0) \|\| is_msix);
	115
	116	if (gvec == 0) {
	117	/* if gvec is 0, the guest is asking for a particular pirq that
	118	* is passed as dest_id */
	119	*ppirq = msi_ext_dest_id(addr >> 32) \| msi_dest_id(addr);
	120	if (!*ppirq) {
	121	/* this probably identifies an misconfiguration of the guest,
	122	* try the emulated path */
	123	*ppirq = XEN_PT_UNASSIGNED_PIRQ;
	124	} else {
	125	XEN_PT_LOG(&s->dev, "requested pirq %d for MSI%s"
	126	" (vec: %#x, entry: %#x)\n",
	127	*ppirq, is_msix ? "-X" : "", gvec, msix_entry);
	128	}
	129	}
	130
	131	if (is_not_mapped) {
	132	uint64_t table_base = 0;
	133
	134	if (is_msix) {
	135	table_base = s->msix->table_base;
	136	}
	137
	138	rc = xc_physdev_map_pirq_msi(xen_xc, xen_domid, XEN_PT_AUTO_ASSIGN,
	139	ppirq, PCI_DEVFN(s->real_device.dev,
	140	s->real_device.func),
	141	s->real_device.bus,
	142	msix_entry, table_base);
	143	if (rc) {
	144	XEN_PT_ERR(&s->dev,
3782f60d JB	145	"Mapping of MSI%s (err: %i, vec: %#x, entry %#x)\n",
3782f60d JB	146	is_msix ? "-X" : "", errno, gvec, msix_entry);
3854ca57 JY	147	return rc;
	148	}
	149	}
	150
	151	return 0;
	152	}
	153	static int msi_msix_update(XenPCIPassthroughState *s,
	154	uint64_t addr,
	155	uint32_t data,
	156	int pirq,
	157	bool is_msix,
	158	int msix_entry,
	159	int *old_pirq)
	160	{
	161	PCIDevice *d = &s->dev;
	162	uint8_t gvec = msi_vector(data);
	163	uint32_t gflags = msi_gflags(data, addr);
	164	int rc = 0;
	165	uint64_t table_addr = 0;
	166
	167	XEN_PT_LOG(d, "Updating MSI%s with pirq %d gvec %#x gflags %#x"
	168	" (entry: %#x)\n",
	169	is_msix ? "-X" : "", pirq, gvec, gflags, msix_entry);
	170
	171	if (is_msix) {
	172	table_addr = s->msix->mmio_base_addr;
	173	}
	174
	175	rc = xc_domain_update_msi_irq(xen_xc, xen_domid, gvec,
	176	pirq, gflags, table_addr);
	177
	178	if (rc) {
3782f60d JB	179	XEN_PT_ERR(d, "Updating of MSI%s failed. (err: %d)\n",
3782f60d JB	180	is_msix ? "-X" : "", errno);
3854ca57 JY	181
3854ca57 JY	182	if (xc_physdev_unmap_pirq(xen_xc, xen_domid, *old_pirq)) {
3782f60d JB	183	XEN_PT_ERR(d, "Unmapping of MSI%s pirq %d failed. (err: %d)\n",
3782f60d JB	184	is_msix ? "-X" : "", *old_pirq, errno);
3854ca57 JY	185	}
	186	*old_pirq = XEN_PT_UNASSIGNED_PIRQ;
	187	}
	188	return rc;
	189	}
	190
	191	static int msi_msix_disable(XenPCIPassthroughState *s,
	192	uint64_t addr,
	193	uint32_t data,
	194	int pirq,
	195	bool is_msix,
	196	bool is_binded)
	197	{
	198	PCIDevice *d = &s->dev;
	199	uint8_t gvec = msi_vector(data);
	200	uint32_t gflags = msi_gflags(data, addr);
	201	int rc = 0;
	202
	203	if (pirq == XEN_PT_UNASSIGNED_PIRQ) {
	204	return 0;
	205	}
	206
	207	if (is_binded) {
	208	XEN_PT_LOG(d, "Unbind MSI%s with pirq %d, gvec %#x\n",
	209	is_msix ? "-X" : "", pirq, gvec);
	210	rc = xc_domain_unbind_msi_irq(xen_xc, xen_domid, gvec, pirq, gflags);
	211	if (rc) {
3782f60d JB	212	XEN_PT_ERR(d, "Unbinding of MSI%s failed. (err: %d, pirq: %d, gvec: %#x)\n",
3782f60d JB	213	is_msix ? "-X" : "", errno, pirq, gvec);
3854ca57 JY	214	return rc;
	215	}
	216	}
	217
	218	XEN_PT_LOG(d, "Unmap MSI%s pirq %d\n", is_msix ? "-X" : "", pirq);
	219	rc = xc_physdev_unmap_pirq(xen_xc, xen_domid, pirq);
	220	if (rc) {
3782f60d JB	221	XEN_PT_ERR(d, "Unmapping of MSI%s pirq %d failed. (err: %i)\n",
3782f60d JB	222	is_msix ? "-X" : "", pirq, errno);
3854ca57 JY	223	return rc;
	224	}
	225
	226	return 0;
	227	}
	228
	229	/*
	230	* MSI virtualization functions
	231	*/
	232
cf8124f0	233	static int xen_pt_msi_set_enable(XenPCIPassthroughState *s, bool enable)
3854ca57 JY	234	{
	235	XEN_PT_LOG(&s->dev, "%s MSI.\n", enable ? "enabling" : "disabling");
	236
	237	if (!s->msi) {
	238	return -1;
	239	}
	240
	241	return msi_msix_enable(s, s->msi->ctrl_offset, PCI_MSI_FLAGS_ENABLE,
	242	enable);
	243	}
	244
	245	/* setup physical msi, but don't enable it */
	246	int xen_pt_msi_setup(XenPCIPassthroughState *s)
	247	{
	248	int pirq = XEN_PT_UNASSIGNED_PIRQ;
	249	int rc = 0;
	250	XenPTMSI *msi = s->msi;
	251
	252	if (msi->initialized) {
	253	XEN_PT_ERR(&s->dev,
	254	"Setup physical MSI when it has been properly initialized.\n");
	255	return -1;
	256	}
	257
	258	rc = msi_msix_setup(s, msi_addr64(msi), msi->data, &pirq, false, 0, true);
	259	if (rc) {
	260	return rc;
	261	}
	262
	263	if (pirq < 0) {
	264	XEN_PT_ERR(&s->dev, "Invalid pirq number: %d.\n", pirq);
	265	return -1;
	266	}
	267
	268	msi->pirq = pirq;
	269	XEN_PT_LOG(&s->dev, "MSI mapped with pirq %d.\n", pirq);
	270
	271	return 0;
	272	}
	273
	274	int xen_pt_msi_update(XenPCIPassthroughState *s)
	275	{
	276	XenPTMSI *msi = s->msi;
	277	return msi_msix_update(s, msi_addr64(msi), msi->data, msi->pirq,
	278	false, 0, &msi->pirq);
	279	}
	280
	281	void xen_pt_msi_disable(XenPCIPassthroughState *s)
	282	{
	283	XenPTMSI *msi = s->msi;
	284
	285	if (!msi) {
	286	return;
	287	}
	288
fe2da64c	289	(void)xen_pt_msi_set_enable(s, false);
3854ca57 JY	290
	291	msi_msix_disable(s, msi_addr64(msi), msi->data, msi->pirq, false,
	292	msi->initialized);
	293
	294	/* clear msi info */
c976437c ZD	295	msi->flags &= ~PCI_MSI_FLAGS_ENABLE;
c976437c ZD	296	msi->initialized = false;
3854ca57 JY	297	msi->mapped = false;
	298	msi->pirq = XEN_PT_UNASSIGNED_PIRQ;
	299	}
	300
	301	/*
	302	* MSI-X virtualization functions
	303	*/
	304
	305	static int msix_set_enable(XenPCIPassthroughState *s, bool enabled)
	306	{
	307	XEN_PT_LOG(&s->dev, "%s MSI-X.\n", enabled ? "enabling" : "disabling");
	308
	309	if (!s->msix) {
	310	return -1;
	311	}
	312
	313	return msi_msix_enable(s, s->msix->ctrl_offset, PCI_MSIX_FLAGS_ENABLE,
	314	enabled);
	315	}
	316
	317	static int xen_pt_msix_update_one(XenPCIPassthroughState *s, int entry_nr)
	318	{
	319	XenPTMSIXEntry *entry = NULL;
	320	int pirq;
	321	int rc;
	322
	323	if (entry_nr < 0 \|\| entry_nr >= s->msix->total_entries) {
	324	return -EINVAL;
	325	}
	326
	327	entry = &s->msix->msix_entry[entry_nr];
	328
	329	if (!entry->updated) {
	330	return 0;
	331	}
	332
	333	pirq = entry->pirq;
	334
044b99c6	335	rc = msi_msix_setup(s, entry->addr, entry->data, &pirq, true, entry_nr,
3854ca57 JY	336	entry->pirq == XEN_PT_UNASSIGNED_PIRQ);
	337	if (rc) {
	338	return rc;
	339	}
	340	if (entry->pirq == XEN_PT_UNASSIGNED_PIRQ) {
	341	entry->pirq = pirq;
	342	}
	343
	344	rc = msi_msix_update(s, entry->addr, entry->data, pirq, true,
	345	entry_nr, &entry->pirq);
	346
	347	if (!rc) {
	348	entry->updated = false;
	349	}
	350
	351	return rc;
	352	}
	353
	354	int xen_pt_msix_update(XenPCIPassthroughState *s)
	355	{
	356	XenPTMSIX *msix = s->msix;
	357	int i;
	358
	359	for (i = 0; i < msix->total_entries; i++) {
	360	xen_pt_msix_update_one(s, i);
	361	}
	362
	363	return 0;
	364	}
	365
	366	void xen_pt_msix_disable(XenPCIPassthroughState *s)
	367	{
	368	int i = 0;
	369
	370	msix_set_enable(s, false);
	371
	372	for (i = 0; i < s->msix->total_entries; i++) {
	373	XenPTMSIXEntry *entry = &s->msix->msix_entry[i];
	374
	375	msi_msix_disable(s, entry->addr, entry->data, entry->pirq, true, true);
	376
	377	/* clear MSI-X info */
	378	entry->pirq = XEN_PT_UNASSIGNED_PIRQ;
	379	entry->updated = false;
	380	}
	381	}
	382
	383	int xen_pt_msix_update_remap(XenPCIPassthroughState *s, int bar_index)
	384	{
	385	XenPTMSIXEntry *entry;
	386	int i, ret;
	387
	388	if (!(s->msix && s->msix->bar_index == bar_index)) {
	389	return 0;
	390	}
	391
	392	for (i = 0; i < s->msix->total_entries; i++) {
	393	entry = &s->msix->msix_entry[i];
	394	if (entry->pirq != XEN_PT_UNASSIGNED_PIRQ) {
	395	ret = xc_domain_unbind_pt_irq(xen_xc, xen_domid, entry->pirq,
	396	PT_IRQ_TYPE_MSI, 0, 0, 0, 0);
	397	if (ret) {
3782f60d JB	398	XEN_PT_ERR(&s->dev, "unbind MSI-X entry %d failed (err: %d)\n",
3782f60d JB	399	entry->pirq, errno);
3854ca57 JY	400	}
	401	entry->updated = true;
	402	}
	403	}
	404	return xen_pt_msix_update(s);
	405	}
	406
	407	static uint32_t get_entry_value(XenPTMSIXEntry *e, int offset)
	408	{
	409	switch (offset) {
	410	case PCI_MSIX_ENTRY_LOWER_ADDR:
	411	return e->addr & UINT32_MAX;
	412	case PCI_MSIX_ENTRY_UPPER_ADDR:
	413	return e->addr >> 32;
	414	case PCI_MSIX_ENTRY_DATA:
	415	return e->data;
	416	case PCI_MSIX_ENTRY_VECTOR_CTRL:
	417	return e->vector_ctrl;
	418	default:
	419	return 0;
	420	}
	421	}
	422
	423	static void set_entry_value(XenPTMSIXEntry *e, int offset, uint32_t val)
	424	{
	425	switch (offset) {
	426	case PCI_MSIX_ENTRY_LOWER_ADDR:
	427	e->addr = (e->addr & ((uint64_t)UINT32_MAX << 32)) \| val;
	428	break;
	429	case PCI_MSIX_ENTRY_UPPER_ADDR:
	430	e->addr = (uint64_t)val << 32 \| (e->addr & UINT32_MAX);
	431	break;
	432	case PCI_MSIX_ENTRY_DATA:
	433	e->data = val;
	434	break;
	435	case PCI_MSIX_ENTRY_VECTOR_CTRL:
	436	e->vector_ctrl = val;
	437	break;
	438	}
	439	}
	440
a8170e5e	441	static void pci_msix_write(void *opaque, hwaddr addr,
3854ca57 JY	442	uint64_t val, unsigned size)
	443	{
	444	XenPCIPassthroughState *s = opaque;
	445	XenPTMSIX *msix = s->msix;
	446	XenPTMSIXEntry *entry;
b38ec5ee	447	unsigned int entry_nr, offset;
3854ca57 JY	448
3854ca57 JY	449	entry_nr = addr / PCI_MSIX_ENTRY_SIZE;
b38ec5ee	450	if (entry_nr >= msix->total_entries) {
3854ca57 JY	451	return;
	452	}
	453	entry = &msix->msix_entry[entry_nr];
	454	offset = addr % PCI_MSIX_ENTRY_SIZE;
	455
	456	if (offset != PCI_MSIX_ENTRY_VECTOR_CTRL) {
	457	const volatile uint32_t *vec_ctrl;
	458
c976437c ZD	459	if (get_entry_value(entry, offset) == val
c976437c ZD	460	&& entry->pirq != XEN_PT_UNASSIGNED_PIRQ) {
3854ca57 JY	461	return;
	462	}
	463
	464	/*
	465	* If Xen intercepts the mask bit access, entry->vec_ctrl may not be
	466	* up-to-date. Read from hardware directly.
	467	*/
	468	vec_ctrl = s->msix->phys_iomem_base + entry_nr * PCI_MSIX_ENTRY_SIZE
	469	+ PCI_MSIX_ENTRY_VECTOR_CTRL;
	470
	471	if (msix->enabled && !(*vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT)) {
b38ec5ee JB	472	if (!entry->warned) {
	473	entry->warned = true;
	474	XEN_PT_ERR(&s->dev, "Can't update msix entry %d since MSI-X is"
	475	" already enabled.\n", entry_nr);
	476	}
3854ca57 JY	477	return;
	478	}
	479
	480	entry->updated = true;
	481	}
	482
	483	set_entry_value(entry, offset, val);
	484
	485	if (offset == PCI_MSIX_ENTRY_VECTOR_CTRL) {
	486	if (msix->enabled && !(val & PCI_MSIX_ENTRY_CTRL_MASKBIT)) {
	487	xen_pt_msix_update_one(s, entry_nr);
	488	}
	489	}
	490	}
	491
a8170e5e	492	static uint64_t pci_msix_read(void *opaque, hwaddr addr,
3854ca57 JY	493	unsigned size)
	494	{
	495	XenPCIPassthroughState *s = opaque;
	496	XenPTMSIX *msix = s->msix;
	497	int entry_nr, offset;
	498
	499	entry_nr = addr / PCI_MSIX_ENTRY_SIZE;
	500	if (entry_nr < 0) {
	501	XEN_PT_ERR(&s->dev, "asked MSI-X entry '%i' invalid!\n", entry_nr);
	502	return 0;
	503	}
	504
	505	offset = addr % PCI_MSIX_ENTRY_SIZE;
	506
	507	if (addr < msix->total_entries * PCI_MSIX_ENTRY_SIZE) {
	508	return get_entry_value(&msix->msix_entry[entry_nr], offset);
	509	} else {
	510	/* Pending Bit Array (PBA) */
	511	return (uint32_t )(msix->phys_iomem_base + addr);
	512	}
	513	}
	514
	515	static const MemoryRegionOps pci_msix_ops = {
	516	.read = pci_msix_read,
	517	.write = pci_msix_write,
	518	.endianness = DEVICE_NATIVE_ENDIAN,
	519	.valid = {
	520	.min_access_size = 4,
	521	.max_access_size = 4,
	522	.unaligned = false,
	523	},
	524	};
	525
	526	int xen_pt_msix_init(XenPCIPassthroughState *s, uint32_t base)
	527	{
	528	uint8_t id = 0;
	529	uint16_t control = 0;
	530	uint32_t table_off = 0;
	531	int i, total_entries, bar_index;
	532	XenHostPCIDevice *hd = &s->real_device;
	533	PCIDevice *d = &s->dev;
	534	int fd = -1;
	535	XenPTMSIX *msix = NULL;
	536	int rc = 0;
	537
	538	rc = xen_host_pci_get_byte(hd, base + PCI_CAP_LIST_ID, &id);
	539	if (rc) {
	540	return rc;
	541	}
	542
	543	if (id != PCI_CAP_ID_MSIX) {
	544	XEN_PT_ERR(d, "Invalid id %#x base %#x\n", id, base);
	545	return -1;
	546	}
	547
	548	xen_host_pci_get_word(hd, base + PCI_MSIX_FLAGS, &control);
	549	total_entries = control & PCI_MSIX_FLAGS_QSIZE;
	550	total_entries += 1;
	551
	552	s->msix = g_malloc0(sizeof (XenPTMSIX)
	553	+ total_entries * sizeof (XenPTMSIXEntry));
	554	msix = s->msix;
	555
	556	msix->total_entries = total_entries;
557	for (i = 0; i < total_entries; i++) {
558	msix->msix_entry[i].pirq = XEN_PT_UNASSIGNED_PIRQ;
559	}
560
22fc860b PB	561	memory_region_init_io(&msix->mmio, OBJECT(s), &pci_msix_ops,
22fc860b PB	562	s, "xen-pci-pt-msix",
3854ca57 JY	563	(total_entries * PCI_MSIX_ENTRY_SIZE
	564	+ XC_PAGE_SIZE - 1)
	565	& XC_PAGE_MASK);
	566
	567	xen_host_pci_get_long(hd, base + PCI_MSIX_TABLE, &table_off);
	568	bar_index = msix->bar_index = table_off & PCI_MSIX_FLAGS_BIRMASK;
	569	table_off = table_off & ~PCI_MSIX_FLAGS_BIRMASK;
	570	msix->table_base = s->real_device.io_regions[bar_index].base_addr;
	571	XEN_PT_LOG(d, "get MSI-X table BAR base 0x%"PRIx64"\n", msix->table_base);
	572
	573	fd = open("/dev/mem", O_RDWR);
	574	if (fd == -1) {
	575	rc = -errno;
	576	XEN_PT_ERR(d, "Can't open /dev/mem: %s\n", strerror(errno));
	577	goto error_out;
	578	}
	579	XEN_PT_LOG(d, "table_off = %#x, total_entries = %d\n",
	580	table_off, total_entries);
	581	msix->table_offset_adjust = table_off & 0x0fff;
	582	msix->phys_iomem_base =
	583	mmap(NULL,
	584	total_entries * PCI_MSIX_ENTRY_SIZE + msix->table_offset_adjust,
	585	PROT_READ,
	586	MAP_SHARED \| MAP_LOCKED,
	587	fd,
	588	msix->table_base + table_off - msix->table_offset_adjust);
	589	close(fd);
	590	if (msix->phys_iomem_base == MAP_FAILED) {
	591	rc = -errno;
	592	XEN_PT_ERR(d, "Can't map physical MSI-X table: %s\n", strerror(errno));
	593	goto error_out;
	594	}
	595	msix->phys_iomem_base = (char *)msix->phys_iomem_base
	596	+ msix->table_offset_adjust;
	597
	598	XEN_PT_LOG(d, "mapping physical MSI-X table to %p\n",
	599	msix->phys_iomem_base);
	600
	601	memory_region_add_subregion_overlap(&s->bar[bar_index], table_off,
	602	&msix->mmio,
	603	2); /* Priority: pci default + 1 */
	604
	605	return 0;
	606
	607	error_out:
3854ca57 JY	608	g_free(s->msix);
	609	s->msix = NULL;
	610	return rc;
	611	}
	612
	613	void xen_pt_msix_delete(XenPCIPassthroughState *s)
	614	{
	615	XenPTMSIX *msix = s->msix;
	616
	617	if (!msix) {
	618	return;
	619	}
	620
	621	/* unmap the MSI-X memory mapped register area */
	622	if (msix->phys_iomem_base) {
	623	XEN_PT_LOG(&s->dev, "unmapping physical MSI-X table from %p\n",
	624	msix->phys_iomem_base);
	625	munmap(msix->phys_iomem_base, msix->total_entries * PCI_MSIX_ENTRY_SIZE
	626	+ msix->table_offset_adjust);
	627	}
	628
	629	memory_region_del_subregion(&s->bar[msix->bar_index], &msix->mmio);
3854ca57 JY	630
	631	g_free(s->msix);
	632	s->msix = NULL;
	633	}