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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH V7 08/11] Introduce Xen PCI Passthrough, PCI config space helpers (2/3)
On Fri, Feb 17, 2012 at 05:08:42PM +0000, Anthony PERARD wrote:
> From: Allen Kay <allen.m.kay@xxxxxxxxx>
>
> A more complete history can be found here:
> git://xenbits.xensource.com/qemu-xen-unstable.git
>
> Signed-off-by: Allen Kay <allen.m.kay@xxxxxxxxx>
> Signed-off-by: Guy Zana <guy@xxxxxxxxxxxx>
> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
> ---
> hw/xen_pci_passthrough.c | 10 +
> hw/xen_pci_passthrough.h | 2 +
> hw/xen_pci_passthrough_config_init.c | 1431
> ++++++++++++++++++++++++++++++++++
> 3 files changed, 1443 insertions(+), 0 deletions(-)
>
> diff --git a/hw/xen_pci_passthrough.c b/hw/xen_pci_passthrough.c
> index 3f305dd..26a3bdd 100644
> --- a/hw/xen_pci_passthrough.c
> +++ b/hw/xen_pci_passthrough.c
> @@ -676,6 +676,13 @@ static int pt_initfn(PCIDevice *d)
> /* Handle real device's MMIO/PIO BARs */
> pt_register_regions(s);
>
> + /* reinitialize each config register to be emulated */
> + if (pt_config_init(s)) {
> + PT_ERR(d, "PCI Config space initialisation failed.\n");
> + host_pci_device_put(s->real_device);
> + return -1;
> + }
> +
> /* Bind interrupt */
> if (!s->dev.config[PCI_INTERRUPT_PIN]) {
> PT_LOG(d, "no pin interrupt\n");
> @@ -773,6 +780,9 @@ static int pt_unregister_device(PCIDevice *d)
> }
> }
>
> + /* delete all emulated config registers */
> + pt_config_delete(s);
> +
> /* unregister real device's MMIO/PIO BARs */
> pt_unregister_regions(s);
>
> diff --git a/hw/xen_pci_passthrough.h b/hw/xen_pci_passthrough.h
> index ea6719c..7ebc793 100644
> --- a/hw/xen_pci_passthrough.h
> +++ b/hw/xen_pci_passthrough.h
> @@ -61,6 +61,8 @@ typedef int (*conf_byte_read)
> #define PT_BAR_ALLF 0xFFFFFFFF /* BAR ALLF value */
> #define PT_PCI_BAR_UNMAPPED (-1)
>
> +#define PCI_CAP_MAX 48
> +
>
> typedef enum {
> GRP_TYPE_HARDWIRED = 0, /* 0 Hardwired reg group */
> diff --git a/hw/xen_pci_passthrough_config_init.c
> b/hw/xen_pci_passthrough_config_init.c
> index 1e9de64..f1fffd1 100644
> --- a/hw/xen_pci_passthrough_config_init.c
> +++ b/hw/xen_pci_passthrough_config_init.c
> @@ -1,11 +1,1442 @@
> +/*
> + * Copyright (c) 2007, Neocleus Corporation.
> + * 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.
> + *
> + * Alex Novik <alex@xxxxxxxxxxxx>
> + * Allen Kay <allen.m.kay@xxxxxxxxx>
> + * Guy Zana <guy@xxxxxxxxxxxx>
> + *
> + * This file implements direct PCI assignment to a HVM guest
> + */
> +
> +#include "qemu-timer.h"
> +#include "xen_backend.h"
> #include "xen_pci_passthrough.h"
>
> +#define PT_MERGE_VALUE(value, data, val_mask) \
> + (((value) & (val_mask)) | ((data) & ~(val_mask)))
> +
> +#define PT_INVALID_REG 0xFFFFFFFF /* invalid register value */
> +
> +/* prototype */
> +
> +static int pt_ptr_reg_init(XenPCIPassthroughState *s, XenPTRegInfo *reg,
> + uint32_t real_offset, uint32_t *data);
> +
> +
> +/* helper */
> +
> +/* A return value of 1 means the capability should NOT be exposed to guest.
> */
> +static int pt_hide_dev_cap(const HostPCIDevice *d, uint8_t grp_id)
> +{
> + switch (grp_id) {
> + case PCI_CAP_ID_EXP:
> + /* The PCI Express Capability Structure of the VF of Intel 82599
> 10GbE
> + * Controller looks trivial, e.g., the PCI Express Capabilities
> + * Register is 0. We should not try to expose it to guest.
> + *
> + * The datasheet is available at
> + *
> http://download.intel.com/design/network/datashts/82599_datasheet.pdf
> + *
> + * See 'Table 9.7. VF PCIe Configuration Space' of the datasheet, the
> + * PCI Express Capability Structure of the VF of Intel 82599 10GbE
> + * Controller looks trivial, e.g., the PCI Express Capabilities
> + * Register is 0, so the Capability Version is 0 and
> + * pt_pcie_size_init() would fail.
> + */
> + if (d->vendor_id == PCI_VENDOR_ID_INTEL &&
> + d->device_id == PCI_DEVICE_ID_INTEL_82599_VF) {
> + return 1;
> + }
> + break;
> + }
> + return 0;
> +}
> +
> +/* find emulate register group entry */
> XenPTRegGroup *pt_find_reg_grp(XenPCIPassthroughState *s, uint32_t address)
> {
> + XenPTRegGroup *entry = NULL;
> +
> + /* find register group entry */
> + QLIST_FOREACH(entry, &s->reg_grp_tbl, entries) {
> + /* check address */
> + if ((entry->base_offset <= address)
> + && ((entry->base_offset + entry->size) > address)) {
> + return entry;
> + }
> + }
> +
> + /* group entry not found */
> return NULL;
> }
>
> +/* find emulate register entry */
> XenPTReg *pt_find_reg(XenPTRegGroup *reg_grp, uint32_t address)
> {
> + XenPTReg *reg_entry = NULL;
> + XenPTRegInfo *reg = NULL;
> + uint32_t real_offset = 0;
> +
> + /* find register entry */
> + QLIST_FOREACH(reg_entry, ®_grp->reg_tbl_list, entries) {
> + reg = reg_entry->reg;
> + real_offset = reg_grp->base_offset + reg->offset;
> + /* check address */
> + if ((real_offset <= address)
> + && ((real_offset + reg->size) > address)) {
> + return reg_entry;
> + }
> + }
> +
> return NULL;
> }
> +
> +/* parse BAR */
> +static PTBarFlag pt_bar_reg_parse(XenPCIPassthroughState *s, XenPTRegInfo
> *reg)
> +{
> + PCIDevice *d = &s->dev;
> + XenPTRegion *region = NULL;
> + PCIIORegion *r;
> + int index = 0;
> +
> + /* check 64bit BAR */
> + index = pt_bar_offset_to_index(reg->offset);
> + if ((0 < index) && (index < PCI_ROM_SLOT)) {
> + int flags = s->real_device->io_regions[index - 1].flags;
> +
> + if ((flags & IORESOURCE_MEM) && (flags & IORESOURCE_MEM_64)) {
> + region = &s->bases[index - 1];
> + if (region->bar_flag != PT_BAR_FLAG_UPPER) {
> + return PT_BAR_FLAG_UPPER;
> + }
> + }
> + }
> +
> + /* check unused BAR */
> + r = &d->io_regions[index];
> + if (r->size == 0) {
> + return PT_BAR_FLAG_UNUSED;
> + }
> +
> + /* for ExpROM BAR */
> + if (index == PCI_ROM_SLOT) {
> + return PT_BAR_FLAG_MEM;
> + }
> +
> + /* check BAR I/O indicator */
> + if (s->real_device->io_regions[index].flags & IORESOURCE_IO) {
> + return PT_BAR_FLAG_IO;
> + } else {
> + return PT_BAR_FLAG_MEM;
> + }
> +}
> +
> +
> +/****************
> + * general register functions
> + */
> +
> +/* register initialization function */
> +
> +static int pt_common_reg_init(XenPCIPassthroughState *s,
> + XenPTRegInfo *reg, uint32_t real_offset,
> + uint32_t *data)
> +{
> + *data = reg->init_val;
> + return 0;
> +}
> +
> +/* Read register functions */
> +
> +static int pt_byte_reg_read(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> + uint8_t *value, uint8_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + uint8_t valid_emu_mask = 0;
> +
> + /* emulate byte register */
> + valid_emu_mask = reg->emu_mask & valid_mask;
> + *value = PT_MERGE_VALUE(*value, cfg_entry->data, ~valid_emu_mask);
> +
> + return 0;
> +}
> +static int pt_word_reg_read(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> + uint16_t *value, uint16_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + uint16_t valid_emu_mask = 0;
> +
> + /* emulate word register */
> + valid_emu_mask = reg->emu_mask & valid_mask;
> + *value = PT_MERGE_VALUE(*value, cfg_entry->data, ~valid_emu_mask);
> +
> + return 0;
> +}
> +static int pt_long_reg_read(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> + uint32_t *value, uint32_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + uint32_t valid_emu_mask = 0;
> +
> + /* emulate long register */
> + valid_emu_mask = reg->emu_mask & valid_mask;
> + *value = PT_MERGE_VALUE(*value, cfg_entry->data, ~valid_emu_mask);
> +
> + return 0;
> +}
> +
> +/* Write register functions */
> +
> +static int pt_byte_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> + uint8_t *value, uint8_t dev_value,
> + uint8_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + uint8_t writable_mask = 0;
> + uint8_t throughable_mask = 0;
> +
> + /* modify emulate register */
> + writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask;
> + cfg_entry->data = PT_MERGE_VALUE(*value, cfg_entry->data, writable_mask);
> +
> + /* create value for writing to I/O device register */
> + throughable_mask = ~reg->emu_mask & valid_mask;
> + *value = PT_MERGE_VALUE(*value, dev_value, throughable_mask);
> +
> + return 0;
> +}
> +static int pt_word_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> + uint16_t *value, uint16_t dev_value,
> + uint16_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + uint16_t writable_mask = 0;
> + uint16_t throughable_mask = 0;
> +
> + /* modify emulate register */
> + writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask;
> + cfg_entry->data = PT_MERGE_VALUE(*value, cfg_entry->data, writable_mask);
> +
> + /* create value for writing to I/O device register */
> + throughable_mask = ~reg->emu_mask & valid_mask;
> + *value = PT_MERGE_VALUE(*value, dev_value, throughable_mask);
> +
> + return 0;
> +}
> +static int pt_long_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> + uint32_t *value, uint32_t dev_value,
> + uint32_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + uint32_t writable_mask = 0;
> + uint32_t throughable_mask = 0;
> +
> + /* modify emulate register */
> + writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask;
> + cfg_entry->data = PT_MERGE_VALUE(*value, cfg_entry->data, writable_mask);
> +
> + /* create value for writing to I/O device register */
> + throughable_mask = ~reg->emu_mask & valid_mask;
> + *value = PT_MERGE_VALUE(*value, dev_value, throughable_mask);
> +
> + return 0;
> +}
> +
> +
> +/* XenPTRegInfo declaration
> + * - only for emulated register (either a part or whole bit).
> + * - for passthrough register that need special behavior (like interacting
> with
> + * other component), set emu_mask to all 0 and specify r/w func properly.
> + * - do NOT use ALL F for init_val, otherwise the tbl will not be registered.
> + */
> +
> +/********************
> + * Header Type0
> + */
> +
> +static int pt_vendor_reg_init(XenPCIPassthroughState *s,
> + XenPTRegInfo *reg, uint32_t real_offset,
> + uint32_t *data)
> +{
> + *data = s->real_device->vendor_id;
> + return 0;
> +}
> +static int pt_device_reg_init(XenPCIPassthroughState *s,
> + XenPTRegInfo *reg, uint32_t real_offset,
> + uint32_t *data)
> +{
> + *data = s->real_device->device_id;
> + return 0;
> +}
> +static int pt_status_reg_init(XenPCIPassthroughState *s,
> + XenPTRegInfo *reg, uint32_t real_offset,
> + uint32_t *data)
> +{
> + XenPTRegGroup *reg_grp_entry = NULL;
> + XenPTReg *reg_entry = NULL;
> + uint32_t reg_field = 0;
> +
> + /* find Header register group */
> + reg_grp_entry = pt_find_reg_grp(s, PCI_CAPABILITY_LIST);
> + if (reg_grp_entry) {
> + /* find Capabilities Pointer register */
> + reg_entry = pt_find_reg(reg_grp_entry, PCI_CAPABILITY_LIST);
> + if (reg_entry) {
> + /* check Capabilities Pointer register */
> + if (reg_entry->data) {
> + reg_field |= PCI_STATUS_CAP_LIST;
> + } else {
> + reg_field &= ~PCI_STATUS_CAP_LIST;
> + }
> + } else {
> + xen_shutdown_fatal_error("Internal error: Couldn't find
> XenPTReg*"
> + " for Capabilities Pointer register."
> + " (%s)\n", __func__);
> + return -1;
> + }
> + } else {
> + xen_shutdown_fatal_error("Internal error: Couldn't find
> XenPTRegGroup"
> + " for Header. (%s)\n", __func__);
> + return -1;
> + }
> +
> + *data = reg_field;
> + return 0;
> +}
> +static int pt_header_type_reg_init(XenPCIPassthroughState *s,
> + XenPTRegInfo *reg, uint32_t real_offset,
> + uint32_t *data)
> +{
> + /* read PCI_HEADER_TYPE */
> + *data = reg->init_val | 0x80;
> + return 0;
> +}
> +
> +/* initialize Interrupt Pin register */
> +static int pt_irqpin_reg_init(XenPCIPassthroughState *s,
> + XenPTRegInfo *reg, uint32_t real_offset,
> + uint32_t *data)
> +{
> + *data = pci_read_intx(s);
> + return 0;
> +}
> +
> +/* Command register */
> +static int pt_cmd_reg_read(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> + uint16_t *value, uint16_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + uint16_t valid_emu_mask = 0;
> + uint16_t emu_mask = reg->emu_mask;
> +
> + if (s->is_virtfn) {
> + emu_mask |= PCI_COMMAND_MEMORY;
> + }
> +
> + /* emulate word register */
> + valid_emu_mask = emu_mask & valid_mask;
> + *value = PT_MERGE_VALUE(*value, cfg_entry->data, ~valid_emu_mask);
> +
> + return 0;
> +}
> +static int pt_cmd_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> + uint16_t *value, uint16_t dev_value,
> + uint16_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + uint16_t writable_mask = 0;
> + uint16_t throughable_mask = 0;
> + uint16_t wr_value = *value;
> + uint16_t emu_mask = reg->emu_mask;
> +
> + if (s->is_virtfn) {
> + emu_mask |= PCI_COMMAND_MEMORY;
> + }
> +
> + /* modify emulate register */
> + writable_mask = ~reg->ro_mask & valid_mask;
> + cfg_entry->data = PT_MERGE_VALUE(*value, cfg_entry->data, writable_mask);
> +
> + /* create value for writing to I/O device register */
> + throughable_mask = ~emu_mask & valid_mask;
> +
> + if (*value & PCI_COMMAND_INTX_DISABLE) {
> + throughable_mask |= PCI_COMMAND_INTX_DISABLE;
> + } else {
> + if (s->machine_irq) {
> + throughable_mask |= PCI_COMMAND_INTX_DISABLE;
> + }
> + }
> +
> + *value = PT_MERGE_VALUE(*value, dev_value, throughable_mask);
> +
> + pt_bar_mapping(s, wr_value & PCI_COMMAND_IO,
> + wr_value & PCI_COMMAND_MEMORY);
> +
IMO this is a wrong way to do this. It completely ignores
things like bridge filtering memory accesses.
The right time to update your mappings is I think
when pci_update_mappings is called.
The memory API which that should have enough hooks for you I think,
at least it seems sufficient for device assignment on kvm.
I don't know much about how well it works for Xen,
worst-case, if absolutely necessary, we could
re-add the ->map call for devices.
> + return 0;
> +}
> +
> +/* BAR */
> +#define PT_BAR_MEM_RO_MASK 0x0000000F /* BAR ReadOnly mask(Memory)
> */
> +#define PT_BAR_MEM_EMU_MASK 0xFFFFFFF0 /* BAR emul mask(Memory) */
> +#define PT_BAR_IO_RO_MASK 0x00000003 /* BAR ReadOnly mask(I/O) */
> +#define PT_BAR_IO_EMU_MASK 0xFFFFFFFC /* BAR emul mask(I/O) */
> +
> +static inline uint32_t base_address_with_flags(HostPCIIORegion *hr)
> +{
> + if ((hr->flags & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
> + return hr->base_addr | (hr->flags & ~PCI_BASE_ADDRESS_IO_MASK);
> + } else {
> + return hr->base_addr | (hr->flags & ~PCI_BASE_ADDRESS_MEM_MASK);
> + }
> +}
> +
> +static int pt_bar_reg_init(XenPCIPassthroughState *s, XenPTRegInfo *reg,
> + uint32_t real_offset, uint32_t *data)
> +{
> + uint32_t reg_field = 0;
> + int index;
> +
> + index = pt_bar_offset_to_index(reg->offset);
> + if (index < 0 || index >= PCI_NUM_REGIONS) {
> + PT_ERR(&s->dev, "Internal error: Invalid BAR index [%d].\n", index);
> + return -1;
> + }
> +
> + s->bases[index].e_physbase = PT_PCI_BAR_UNMAPPED;
> +
> + /* set BAR flag */
> + s->bases[index].bar_flag = pt_bar_reg_parse(s, reg);
> + if (s->bases[index].bar_flag == PT_BAR_FLAG_UNUSED) {
> + reg_field = PT_INVALID_REG;
> + }
> +
> + *data = reg_field;
> + return 0;
> +}
> +static int pt_bar_reg_read(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> + uint32_t *value, uint32_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + uint32_t valid_emu_mask = 0;
> + uint32_t bar_emu_mask = 0;
> + int index;
> +
> + /* get BAR index */
> + index = pt_bar_offset_to_index(reg->offset);
> + if (index < 0 || index >= PCI_NUM_REGIONS) {
> + PT_ERR(&s->dev, "Internal error: Invalid BAR index [%d].\n", index);
> + return -1;
> + }
> +
> + /* use fixed-up value from kernel sysfs */
> + *value = base_address_with_flags(&s->real_device->io_regions[index]);
> +
> + /* set emulate mask depend on BAR flag */
> + switch (s->bases[index].bar_flag) {
> + case PT_BAR_FLAG_MEM:
> + bar_emu_mask = PT_BAR_MEM_EMU_MASK;
> + break;
> + case PT_BAR_FLAG_IO:
> + bar_emu_mask = PT_BAR_IO_EMU_MASK;
> + break;
> + case PT_BAR_FLAG_UPPER:
> + bar_emu_mask = PT_BAR_ALLF;
> + break;
> + default:
> + break;
> + }
> +
> + /* emulate BAR */
> + valid_emu_mask = bar_emu_mask & valid_mask;
> + *value = PT_MERGE_VALUE(*value, cfg_entry->data, ~valid_emu_mask);
> +
> + return 0;
> +}
> +static int pt_bar_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> + uint32_t *value, uint32_t dev_value,
> + uint32_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + XenPTRegGroup *reg_grp_entry = NULL;
> + XenPTReg *reg_entry = NULL;
> + XenPTRegion *base = NULL;
> + PCIDevice *d = &s->dev;
> + const PCIIORegion *r;
> + uint32_t writable_mask = 0;
> + uint32_t throughable_mask = 0;
> + uint32_t bar_emu_mask = 0;
> + uint32_t bar_ro_mask = 0;
> + uint32_t r_size = 0;
> + int index = 0;
> +
> + index = pt_bar_offset_to_index(reg->offset);
> + if (index < 0 || index >= PCI_NUM_REGIONS) {
> + PT_ERR(d, "Internal error: Invalid BAR index [%d].\n", index);
> + return -1;
> + }
> +
> + r = &d->io_regions[index];
> + base = &s->bases[index];
> + r_size = pt_get_emul_size(base->bar_flag, r->size);
> +
> + /* set emulate mask and read-only mask values depend on the BAR flag */
> + switch (s->bases[index].bar_flag) {
> + case PT_BAR_FLAG_MEM:
> + bar_emu_mask = PT_BAR_MEM_EMU_MASK;
> + bar_ro_mask = PT_BAR_MEM_RO_MASK | (r_size - 1);
> + break;
> + case PT_BAR_FLAG_IO:
> + bar_emu_mask = PT_BAR_IO_EMU_MASK;
> + bar_ro_mask = PT_BAR_IO_RO_MASK | (r_size - 1);
> + break;
> + case PT_BAR_FLAG_UPPER:
> + bar_emu_mask = PT_BAR_ALLF;
> + bar_ro_mask = 0; /* all upper 32bit are R/W */
> + break;
> + default:
> + break;
> + }
> +
> + /* modify emulate register */
> + writable_mask = bar_emu_mask & ~bar_ro_mask & valid_mask;
> + cfg_entry->data = PT_MERGE_VALUE(*value, cfg_entry->data, writable_mask);
> +
> + /* check whether we need to update the virtual region address or not */
> + switch (s->bases[index].bar_flag) {
> + case PT_BAR_FLAG_MEM:
> + /* nothing to do */
> + break;
> + case PT_BAR_FLAG_IO:
> + /* nothing to do */
> + break;
> + case PT_BAR_FLAG_UPPER:
> + if (cfg_entry->data) {
> + if (cfg_entry->data != (PT_BAR_ALLF & ~bar_ro_mask)) {
> + PT_WARN(d, "Guest attempt to set high MMIO Base Address. "
> + "Ignore mapping. "
> + "(offset: 0x%02x, high address: 0x%08x)\n",
> + reg->offset, cfg_entry->data);
> + }
> + }
> + break;
> + default:
> + break;
> + }
> +
> + /* create value for writing to I/O device register */
> + throughable_mask = ~bar_emu_mask & valid_mask;
> + *value = PT_MERGE_VALUE(*value, dev_value, throughable_mask);
> +
> + /* After BAR reg update, we need to remap BAR */
> + reg_grp_entry = pt_find_reg_grp(s, PCI_COMMAND);
> + if (reg_grp_entry) {
> + reg_entry = pt_find_reg(reg_grp_entry, PCI_COMMAND);
> + if (reg_entry) {
> + pt_bar_mapping_one(s, index, reg_entry->data & PCI_COMMAND_IO,
> + reg_entry->data & PCI_COMMAND_MEMORY);
> + }
> + }
> +
> + return 0;
> +}
> +
> +/* write Exp ROM BAR */
> +static int pt_exp_rom_bar_reg_write(XenPCIPassthroughState *s,
> + XenPTReg *cfg_entry, uint32_t *value,
> + uint32_t dev_value, uint32_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + XenPTRegGroup *reg_grp_entry = NULL;
> + XenPTReg *reg_entry = NULL;
> + XenPTRegion *base = NULL;
> + PCIDevice *d = (PCIDevice *)&s->dev;
> + PCIIORegion *r;
> + uint32_t writable_mask = 0;
> + uint32_t throughable_mask = 0;
> + pcibus_t r_size = 0;
> + uint32_t bar_emu_mask = 0;
> + uint32_t bar_ro_mask = 0;
> +
> + r = &d->io_regions[PCI_ROM_SLOT];
> + r_size = r->size;
> + base = &s->bases[PCI_ROM_SLOT];
> + /* align memory type resource size */
> + pt_get_emul_size(base->bar_flag, r_size);
> +
> + /* set emulate mask and read-only mask */
> + bar_emu_mask = reg->emu_mask;
> + bar_ro_mask = (reg->ro_mask | (r_size - 1)) & ~PCI_ROM_ADDRESS_ENABLE;
> +
> + /* modify emulate register */
> + writable_mask = ~bar_ro_mask & valid_mask;
> + cfg_entry->data = PT_MERGE_VALUE(*value, cfg_entry->data, writable_mask);
> +
> + /* update the corresponding virtual region address */
> + /*
> + * When guest code tries to get block size of mmio, it will write all
> "1"s
> + * into pci bar register. In this case, cfg_entry->data == writable_mask.
> + * Especially for devices with large mmio, the value of writable_mask
> + * is likely to be a guest physical address that has been mapped to ram
> + * rather than mmio. Remapping this value to mmio should be prevented.
> + */
> +
> + if (cfg_entry->data != writable_mask) {
> + r->addr = cfg_entry->data;
> + }
> +
> + /* create value for writing to I/O device register */
> + throughable_mask = ~bar_emu_mask & valid_mask;
> + *value = PT_MERGE_VALUE(*value, dev_value, throughable_mask);
> +
> + /* After BAR reg update, we need to remap BAR*/
> + reg_grp_entry = pt_find_reg_grp(s, PCI_COMMAND);
> + if (reg_grp_entry) {
> + reg_entry = pt_find_reg(reg_grp_entry, PCI_COMMAND);
> + if (reg_entry) {
> + pt_bar_mapping_one(s, PCI_ROM_SLOT,
> + reg_entry->data & PCI_COMMAND_IO,
> + reg_entry->data & PCI_COMMAND_MEMORY);
> + }
> + }
> +
> + return 0;
> +}
> +
> +/* Header Type0 reg static infomation table */
> +static XenPTRegInfo pt_emu_reg_header0_tbl[] = {
> + /* Vendor ID reg */
> + {
> + .offset = PCI_VENDOR_ID,
> + .size = 2,
> + .init_val = 0x0000,
> + .ro_mask = 0xFFFF,
> + .emu_mask = 0xFFFF,
> + .init = pt_vendor_reg_init,
> + .u.w.read = pt_word_reg_read,
> + .u.w.write = pt_word_reg_write,
> + },
> + /* Device ID reg */
> + {
> + .offset = PCI_DEVICE_ID,
> + .size = 2,
> + .init_val = 0x0000,
> + .ro_mask = 0xFFFF,
> + .emu_mask = 0xFFFF,
> + .init = pt_device_reg_init,
> + .u.w.read = pt_word_reg_read,
> + .u.w.write = pt_word_reg_write,
> + },
> + /* Command reg */
> + {
> + .offset = PCI_COMMAND,
> + .size = 2,
> + .init_val = 0x0000,
> + .ro_mask = 0xF880,
> + .emu_mask = 0x0740,
> + .init = pt_common_reg_init,
> + .u.w.read = pt_cmd_reg_read,
> + .u.w.write = pt_cmd_reg_write,
> + },
> + /* Capabilities Pointer reg */
> + {
> + .offset = PCI_CAPABILITY_LIST,
> + .size = 1,
> + .init_val = 0x00,
> + .ro_mask = 0xFF,
> + .emu_mask = 0xFF,
> + .init = pt_ptr_reg_init,
> + .u.b.read = pt_byte_reg_read,
> + .u.b.write = pt_byte_reg_write,
> + },
> + /* Status reg */
> + /* use emulated Cap Ptr value to initialize,
> + * so need to be declared after Cap Ptr reg
> + */
> + {
> + .offset = PCI_STATUS,
> + .size = 2,
> + .init_val = 0x0000,
> + .ro_mask = 0x06FF,
> + .emu_mask = 0x0010,
> + .init = pt_status_reg_init,
> + .u.w.read = pt_word_reg_read,
> + .u.w.write = pt_word_reg_write,
> + },
> + /* Cache Line Size reg */
> + {
> + .offset = PCI_CACHE_LINE_SIZE,
> + .size = 1,
> + .init_val = 0x00,
> + .ro_mask = 0x00,
> + .emu_mask = 0xFF,
> + .init = pt_common_reg_init,
> + .u.b.read = pt_byte_reg_read,
> + .u.b.write = pt_byte_reg_write,
> + },
> + /* Latency Timer reg */
> + {
> + .offset = PCI_LATENCY_TIMER,
> + .size = 1,
> + .init_val = 0x00,
> + .ro_mask = 0x00,
> + .emu_mask = 0xFF,
> + .init = pt_common_reg_init,
> + .u.b.read = pt_byte_reg_read,
> + .u.b.write = pt_byte_reg_write,
> + },
> + /* Header Type reg */
> + {
> + .offset = PCI_HEADER_TYPE,
> + .size = 1,
> + .init_val = 0x00,
> + .ro_mask = 0xFF,
> + .emu_mask = 0x00,
> + .init = pt_header_type_reg_init,
> + .u.b.read = pt_byte_reg_read,
> + .u.b.write = pt_byte_reg_write,
> + },
> + /* Interrupt Line reg */
> + {
> + .offset = PCI_INTERRUPT_LINE,
> + .size = 1,
> + .init_val = 0x00,
> + .ro_mask = 0x00,
> + .emu_mask = 0xFF,
> + .init = pt_common_reg_init,
> + .u.b.read = pt_byte_reg_read,
> + .u.b.write = pt_byte_reg_write,
> + },
> + /* Interrupt Pin reg */
> + {
> + .offset = PCI_INTERRUPT_PIN,
> + .size = 1,
> + .init_val = 0x00,
> + .ro_mask = 0xFF,
> + .emu_mask = 0xFF,
> + .init = pt_irqpin_reg_init,
> + .u.b.read = pt_byte_reg_read,
> + .u.b.write = pt_byte_reg_write,
> + },
> + /* BAR 0 reg */
> + /* mask of BAR need to be decided later, depends on IO/MEM type */
> + {
> + .offset = PCI_BASE_ADDRESS_0,
> + .size = 4,
> + .init_val = 0x00000000,
> + .init = pt_bar_reg_init,
> + .u.dw.read = pt_bar_reg_read,
> + .u.dw.write = pt_bar_reg_write,
> + },
> + /* BAR 1 reg */
> + {
> + .offset = PCI_BASE_ADDRESS_1,
> + .size = 4,
> + .init_val = 0x00000000,
> + .init = pt_bar_reg_init,
> + .u.dw.read = pt_bar_reg_read,
> + .u.dw.write = pt_bar_reg_write,
> + },
> + /* BAR 2 reg */
> + {
> + .offset = PCI_BASE_ADDRESS_2,
> + .size = 4,
> + .init_val = 0x00000000,
> + .init = pt_bar_reg_init,
> + .u.dw.read = pt_bar_reg_read,
> + .u.dw.write = pt_bar_reg_write,
> + },
> + /* BAR 3 reg */
> + {
> + .offset = PCI_BASE_ADDRESS_3,
> + .size = 4,
> + .init_val = 0x00000000,
> + .init = pt_bar_reg_init,
> + .u.dw.read = pt_bar_reg_read,
> + .u.dw.write = pt_bar_reg_write,
> + },
> + /* BAR 4 reg */
> + {
> + .offset = PCI_BASE_ADDRESS_4,
> + .size = 4,
> + .init_val = 0x00000000,
> + .init = pt_bar_reg_init,
> + .u.dw.read = pt_bar_reg_read,
> + .u.dw.write = pt_bar_reg_write,
> + },
> + /* BAR 5 reg */
> + {
> + .offset = PCI_BASE_ADDRESS_5,
> + .size = 4,
> + .init_val = 0x00000000,
> + .init = pt_bar_reg_init,
> + .u.dw.read = pt_bar_reg_read,
> + .u.dw.write = pt_bar_reg_write,
> + },
> + /* Expansion ROM BAR reg */
> + {
> + .offset = PCI_ROM_ADDRESS,
> + .size = 4,
> + .init_val = 0x00000000,
> + .ro_mask = 0x000007FE,
> + .emu_mask = 0xFFFFF800,
> + .init = pt_bar_reg_init,
> + .u.dw.read = pt_long_reg_read,
> + .u.dw.write = pt_exp_rom_bar_reg_write,
> + },
> + {
> + .size = 0,
> + },
> +};
> +
> +
> +/*********************************
> + * Vital Product Data Capability
> + */
> +
> +/* Vital Product Data Capability Structure reg static infomation table */
> +static XenPTRegInfo pt_emu_reg_vpd_tbl[] = {
> + {
> + .offset = PCI_CAP_LIST_NEXT,
> + .size = 1,
> + .init_val = 0x00,
> + .ro_mask = 0xFF,
> + .emu_mask = 0xFF,
> + .init = pt_ptr_reg_init,
> + .u.b.read = pt_byte_reg_read,
> + .u.b.write = pt_byte_reg_write,
> + },
> + {
> + .size = 0,
> + },
> +};
> +
> +
> +/**************************************
> + * Vendor Specific Capability
> + */
> +
> +/* Vendor Specific Capability Structure reg static infomation table */
> +static XenPTRegInfo pt_emu_reg_vendor_tbl[] = {
> + {
> + .offset = PCI_CAP_LIST_NEXT,
> + .size = 1,
> + .init_val = 0x00,
> + .ro_mask = 0xFF,
> + .emu_mask = 0xFF,
> + .init = pt_ptr_reg_init,
> + .u.b.read = pt_byte_reg_read,
> + .u.b.write = pt_byte_reg_write,
> + },
> + {
> + .size = 0,
> + },
> +};
> +
> +
> +/*****************************
> + * PCI Express Capability
> + */
> +
> +static inline uint8_t get_capability_version(XenPCIPassthroughState *s,
> + uint32_t offset)
> +{
> + uint8_t flags = pci_get_byte(s->dev.config + offset + PCI_EXP_FLAGS);
> + return flags & PCI_EXP_FLAGS_VERS;
> +}
> +
> +static inline uint8_t get_device_type(XenPCIPassthroughState *s,
> + uint32_t offset)
> +{
> + uint8_t flags = pci_get_byte(s->dev.config + offset + PCI_EXP_FLAGS);
> + return (flags & PCI_EXP_FLAGS_TYPE) >> 4;
> +}
> +
> +/* initialize Link Control register */
> +static int pt_linkctrl_reg_init(XenPCIPassthroughState *s,
> + XenPTRegInfo *reg, uint32_t real_offset,
> + uint32_t *data)
> +{
> + uint8_t cap_ver = get_capability_version(s, real_offset - reg->offset);
> + uint8_t dev_type = get_device_type(s, real_offset - reg->offset);
> +
> + /* no need to initialize in case of Root Complex Integrated Endpoint
> + * with cap_ver 1.x
> + */
> + if ((dev_type == PCI_EXP_TYPE_RC_END) && (cap_ver == 1)) {
> + *data = PT_INVALID_REG;
> + }
> +
> + *data = reg->init_val;
> + return 0;
> +}
> +/* initialize Device Control 2 register */
> +static int pt_devctrl2_reg_init(XenPCIPassthroughState *s,
> + XenPTRegInfo *reg, uint32_t real_offset,
> + uint32_t *data)
> +{
> + uint8_t cap_ver = get_capability_version(s, real_offset - reg->offset);
> +
> + /* no need to initialize in case of cap_ver 1.x */
> + if (cap_ver == 1) {
> + *data = PT_INVALID_REG;
> + }
> +
> + *data = reg->init_val;
> + return 0;
> +}
> +/* initialize Link Control 2 register */
> +static int pt_linkctrl2_reg_init(XenPCIPassthroughState *s,
> + XenPTRegInfo *reg, uint32_t real_offset,
> + uint32_t *data)
> +{
> + uint8_t cap_ver = get_capability_version(s, real_offset - reg->offset);
> + uint32_t reg_field = 0;
> +
> + /* no need to initialize in case of cap_ver 1.x */
> + if (cap_ver == 1) {
> + reg_field = PT_INVALID_REG;
> + } else {
> + /* set Supported Link Speed */
> + uint8_t lnkcap = pci_get_byte(s->dev.config + real_offset -
> reg->offset
> + + PCI_EXP_LNKCAP);
> + reg_field |= PCI_EXP_LNKCAP_SLS & lnkcap;
> + }
> +
> + *data = reg_field;
> + return 0;
> +}
> +
> +/* PCI Express Capability Structure reg static infomation table */
> +static XenPTRegInfo pt_emu_reg_pcie_tbl[] = {
> + /* Next Pointer reg */
> + {
> + .offset = PCI_CAP_LIST_NEXT,
> + .size = 1,
> + .init_val = 0x00,
> + .ro_mask = 0xFF,
> + .emu_mask = 0xFF,
> + .init = pt_ptr_reg_init,
> + .u.b.read = pt_byte_reg_read,
> + .u.b.write = pt_byte_reg_write,
> + },
> + /* Device Capabilities reg */
> + {
> + .offset = PCI_EXP_DEVCAP,
> + .size = 4,
> + .init_val = 0x00000000,
> + .ro_mask = 0x1FFCFFFF,
> + .emu_mask = 0x10000000,
> + .init = pt_common_reg_init,
> + .u.dw.read = pt_long_reg_read,
> + .u.dw.write = pt_long_reg_write,
> + },
> + /* Device Control reg */
> + {
> + .offset = PCI_EXP_DEVCTL,
> + .size = 2,
> + .init_val = 0x2810,
> + .ro_mask = 0x8400,
> + .emu_mask = 0xFFFF,
> + .init = pt_common_reg_init,
> + .u.w.read = pt_word_reg_read,
> + .u.w.write = pt_word_reg_write,
> + },
> + /* Link Control reg */
> + {
> + .offset = PCI_EXP_LNKCTL,
> + .size = 2,
> + .init_val = 0x0000,
> + .ro_mask = 0xFC34,
> + .emu_mask = 0xFFFF,
> + .init = pt_linkctrl_reg_init,
> + .u.w.read = pt_word_reg_read,
> + .u.w.write = pt_word_reg_write,
> + },
> + /* Device Control 2 reg */
> + {
> + .offset = 0x28,
> + .size = 2,
> + .init_val = 0x0000,
> + .ro_mask = 0xFFE0,
> + .emu_mask = 0xFFFF,
> + .init = pt_devctrl2_reg_init,
> + .u.w.read = pt_word_reg_read,
> + .u.w.write = pt_word_reg_write,
> + },
> + /* Link Control 2 reg */
> + {
> + .offset = 0x30,
> + .size = 2,
> + .init_val = 0x0000,
> + .ro_mask = 0xE040,
> + .emu_mask = 0xFFFF,
> + .init = pt_linkctrl2_reg_init,
> + .u.w.read = pt_word_reg_read,
> + .u.w.write = pt_word_reg_write,
> + },
> + {
> + .size = 0,
> + },
> +};
> +
> +
> +/*********************************
> + * Power Management Capability
> + */
> +
> +/* read Power Management Control/Status register */
> +static int pt_pmcsr_reg_read(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> + uint16_t *value, uint16_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + uint16_t valid_emu_mask = reg->emu_mask;
> +
> + valid_emu_mask |= PCI_PM_CTRL_STATE_MASK | PCI_PM_CTRL_NO_SOFT_RESET;
> +
> + valid_emu_mask = valid_emu_mask & valid_mask;
> + *value = PT_MERGE_VALUE(*value, cfg_entry->data, ~valid_emu_mask);
> +
> + return 0;
> +}
> +/* write Power Management Control/Status register */
> +static int pt_pmcsr_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> + uint16_t *value, uint16_t dev_value,
> + uint16_t valid_mask)
> +{
> + XenPTRegInfo *reg = cfg_entry->reg;
> + uint16_t emu_mask = reg->emu_mask;
> + uint16_t writable_mask = 0;
> + uint16_t throughable_mask = 0;
> +
> + emu_mask |= PCI_PM_CTRL_STATE_MASK | PCI_PM_CTRL_NO_SOFT_RESET;
> +
> + /* modify emulate register */
> + writable_mask = emu_mask & ~reg->ro_mask & valid_mask;
> + cfg_entry->data = PT_MERGE_VALUE(*value, cfg_entry->data, writable_mask);
> +
> + /* create value for writing to I/O device register */
> + throughable_mask = ~emu_mask & valid_mask;
> + *value = PT_MERGE_VALUE(*value, dev_value, throughable_mask);
> +
> + return 0;
> +}
> +
> +/* Power Management Capability reg static infomation table */
> +static XenPTRegInfo pt_emu_reg_pm_tbl[] = {
> + /* Next Pointer reg */
> + {
> + .offset = PCI_CAP_LIST_NEXT,
> + .size = 1,
> + .init_val = 0x00,
> + .ro_mask = 0xFF,
> + .emu_mask = 0xFF,
> + .init = pt_ptr_reg_init,
> + .u.b.read = pt_byte_reg_read,
> + .u.b.write = pt_byte_reg_write,
> + },
> + /* Power Management Capabilities reg */
> + {
> + .offset = PCI_CAP_FLAGS,
> + .size = 2,
> + .init_val = 0x0000,
> + .ro_mask = 0xFFFF,
> + .emu_mask = 0xF9C8,
> + .init = pt_common_reg_init,
> + .u.w.read = pt_word_reg_read,
> + .u.w.write = pt_word_reg_write,
> + },
> + /* PCI Power Management Control/Status reg */
> + {
> + .offset = PCI_PM_CTRL,
> + .size = 2,
> + .init_val = 0x0008,
> + .ro_mask = 0xE1FC,
> + .emu_mask = 0x8100,
> + .init = pt_common_reg_init,
> + .u.w.read = pt_pmcsr_reg_read,
> + .u.w.write = pt_pmcsr_reg_write,
> + },
> + {
> + .size = 0,
> + },
> +};
> +
> +
> +/****************************
> + * Capabilities
> + */
> +
> +/* capability structure register group size functions */
> +
> +static int pt_reg_grp_size_init(XenPCIPassthroughState *s,
> + const XenPTRegGroupInfo *grp_reg,
> + uint32_t base_offset, uint8_t *size)
> +{
> + *size = grp_reg->grp_size;
> + return 0;
> +}
> +/* get Vendor Specific Capability Structure register group size */
> +static int pt_vendor_size_init(XenPCIPassthroughState *s,
> + const XenPTRegGroupInfo *grp_reg,
> + uint32_t base_offset, uint8_t *size)
> +{
> + *size = pci_get_byte(s->dev.config + base_offset + 0x02);
> + return 0;
> +}
> +/* get PCI Express Capability Structure register group size */
> +static int pt_pcie_size_init(XenPCIPassthroughState *s,
> + const XenPTRegGroupInfo *grp_reg,
> + uint32_t base_offset, uint8_t *size)
> +{
> + PCIDevice *d = &s->dev;
> + uint8_t version = get_capability_version(s, base_offset);
> + uint8_t type = get_device_type(s, base_offset);
> + uint8_t pcie_size = 0;
> +
> +
> + /* calculate size depend on capability version and device/port type */
> + /* in case of PCI Express Base Specification Rev 1.x */
> + if (version == 1) {
> + /* The PCI Express Capabilities, Device Capabilities, and Device
> + * Status/Control registers are required for all PCI Express devices.
> + * The Link Capabilities and Link Status/Control are required for all
> + * Endpoints that are not Root Complex Integrated Endpoints.
> Endpoints
> + * are not required to implement registers other than those listed
> + * above and terminate the capability structure.
> + */
> + switch (type) {
> + case PCI_EXP_TYPE_ENDPOINT:
> + case PCI_EXP_TYPE_LEG_END:
> + pcie_size = 0x14;
> + break;
> + case PCI_EXP_TYPE_RC_END:
> + /* has no link */
> + pcie_size = 0x0C;
> + break;
> + /* only EndPoint passthrough is supported */
> + case PCI_EXP_TYPE_ROOT_PORT:
> + case PCI_EXP_TYPE_UPSTREAM:
> + case PCI_EXP_TYPE_DOWNSTREAM:
> + case PCI_EXP_TYPE_PCI_BRIDGE:
> + case PCI_EXP_TYPE_PCIE_BRIDGE:
> + case PCI_EXP_TYPE_RC_EC:
> + default:
> + PT_ERR(d, "Unsupported device/port type %#x.\n", type);
> + return -1;
> + }
> + }
> + /* in case of PCI Express Base Specification Rev 2.0 */
> + else if (version == 2) {
> + switch (type) {
> + case PCI_EXP_TYPE_ENDPOINT:
> + case PCI_EXP_TYPE_LEG_END:
> + case PCI_EXP_TYPE_RC_END:
> + /* For Functions that do not implement the registers,
> + * these spaces must be hardwired to 0b.
> + */
> + pcie_size = 0x3C;
> + break;
> + /* only EndPoint passthrough is supported */
> + case PCI_EXP_TYPE_ROOT_PORT:
> + case PCI_EXP_TYPE_UPSTREAM:
> + case PCI_EXP_TYPE_DOWNSTREAM:
> + case PCI_EXP_TYPE_PCI_BRIDGE:
> + case PCI_EXP_TYPE_PCIE_BRIDGE:
> + case PCI_EXP_TYPE_RC_EC:
> + default:
> + PT_ERR(d, "Unsupported device/port type %#x.\n", type);
> + return -1;
> + }
> + } else {
> + PT_ERR(d, "Unsupported capability version %#x.\n", version);
> + return -1;
> + }
> +
> + *size = pcie_size;
> + return 0;
> +}
> +
> +static const XenPTRegGroupInfo pt_emu_reg_grp_tbl[] = {
> + /* Header Type0 reg group */
> + {
> + .grp_id = 0xFF,
> + .grp_type = GRP_TYPE_EMU,
> + .grp_size = 0x40,
> + .size_init = pt_reg_grp_size_init,
> + .emu_reg_tbl = pt_emu_reg_header0_tbl,
> + },
> + /* PCI PowerManagement Capability reg group */
> + {
> + .grp_id = PCI_CAP_ID_PM,
> + .grp_type = GRP_TYPE_EMU,
> + .grp_size = PCI_PM_SIZEOF,
> + .size_init = pt_reg_grp_size_init,
> + .emu_reg_tbl = pt_emu_reg_pm_tbl,
> + },
> + /* AGP Capability Structure reg group */
> + {
> + .grp_id = PCI_CAP_ID_AGP,
> + .grp_type = GRP_TYPE_HARDWIRED,
> + .grp_size = 0x30,
> + .size_init = pt_reg_grp_size_init,
> + },
> + /* Vital Product Data Capability Structure reg group */
> + {
> + .grp_id = PCI_CAP_ID_VPD,
> + .grp_type = GRP_TYPE_EMU,
> + .grp_size = 0x08,
> + .size_init = pt_reg_grp_size_init,
> + .emu_reg_tbl = pt_emu_reg_vpd_tbl,
> + },
> + /* Slot Identification reg group */
> + {
> + .grp_id = PCI_CAP_ID_SLOTID,
> + .grp_type = GRP_TYPE_HARDWIRED,
> + .grp_size = 0x04,
> + .size_init = pt_reg_grp_size_init,
> + },
> + /* PCI-X Capabilities List Item reg group */
> + {
> + .grp_id = PCI_CAP_ID_PCIX,
> + .grp_type = GRP_TYPE_HARDWIRED,
> + .grp_size = 0x18,
> + .size_init = pt_reg_grp_size_init,
> + },
> + /* Vendor Specific Capability Structure reg group */
> + {
> + .grp_id = PCI_CAP_ID_VNDR,
> + .grp_type = GRP_TYPE_EMU,
> + .grp_size = 0xFF,
> + .size_init = pt_vendor_size_init,
> + .emu_reg_tbl = pt_emu_reg_vendor_tbl,
> + },
> + /* SHPC Capability List Item reg group */
> + {
> + .grp_id = PCI_CAP_ID_SHPC,
> + .grp_type = GRP_TYPE_HARDWIRED,
> + .grp_size = 0x08,
> + .size_init = pt_reg_grp_size_init,
> + },
> + /* Subsystem ID and Subsystem Vendor ID Capability List Item reg group */
> + {
> + .grp_id = PCI_CAP_ID_SSVID,
> + .grp_type = GRP_TYPE_HARDWIRED,
> + .grp_size = 0x08,
> + .size_init = pt_reg_grp_size_init,
> + },
> + /* AGP 8x Capability Structure reg group */
> + {
> + .grp_id = PCI_CAP_ID_AGP3,
> + .grp_type = GRP_TYPE_HARDWIRED,
> + .grp_size = 0x30,
> + .size_init = pt_reg_grp_size_init,
> + },
> + /* PCI Express Capability Structure reg group */
> + {
> + .grp_id = PCI_CAP_ID_EXP,
> + .grp_type = GRP_TYPE_EMU,
> + .grp_size = 0xFF,
> + .size_init = pt_pcie_size_init,
> + .emu_reg_tbl = pt_emu_reg_pcie_tbl,
> + },
> + {
> + .grp_size = 0,
> + },
> +};
> +
> +/* initialize Capabilities Pointer or Next Pointer register */
> +static int pt_ptr_reg_init(XenPCIPassthroughState *s,
> + XenPTRegInfo *reg, uint32_t real_offset,
> + uint32_t *data)
> +{
> + int i;
> + uint8_t *config = s->dev.config;
> + uint32_t reg_field = pci_get_byte(config + real_offset);
> + uint8_t cap_id = 0;
> +
> + /* find capability offset */
> + while (reg_field) {
> + for (i = 0; pt_emu_reg_grp_tbl[i].grp_size != 0; i++) {
> + if (pt_hide_dev_cap(s->real_device,
> + pt_emu_reg_grp_tbl[i].grp_id)) {
> + continue;
> + }
> +
> + cap_id = pci_get_byte(config + reg_field + PCI_CAP_LIST_ID);
> + if (pt_emu_reg_grp_tbl[i].grp_id == cap_id) {
> + if (pt_emu_reg_grp_tbl[i].grp_type == GRP_TYPE_EMU) {
> + goto out;
> + }
> + /* ignore the 0 hardwired capability, find next one */
> + break;
> + }
> + }
> +
> + /* next capability */
> + reg_field = pci_get_byte(config + reg_field + PCI_CAP_LIST_NEXT);
> + }
> +
> +out:
> + *data = reg_field;
> + return 0;
> +}
> +
> +
> +/*************
> + * Main
> + */
> +
> +static uint8_t find_cap_offset(XenPCIPassthroughState *s, uint8_t cap)
> +{
> + uint8_t id;
> + unsigned max_cap = PCI_CAP_MAX;
> + uint8_t pos = PCI_CAPABILITY_LIST;
> + uint8_t status = 0;
> +
> + if (host_pci_get_byte(s->real_device, PCI_STATUS, &status)) {
> + return 0;
> + }
> + if ((status & PCI_STATUS_CAP_LIST) == 0) {
> + return 0;
> + }
> +
> + while (max_cap--) {
> + if (host_pci_get_byte(s->real_device, pos, &pos)) {
> + break;
> + }
> + if (pos < PCI_CONFIG_HEADER_SIZE) {
> + break;
> + }
> +
> + pos &= ~3;
> + if (host_pci_get_byte(s->real_device, pos + PCI_CAP_LIST_ID, &id)) {
> + break;
> + }
> +
> + if (id == 0xff) {
> + break;
> + }
> + if (id == cap) {
> + return pos;
> + }
> +
> + pos += PCI_CAP_LIST_NEXT;
> + }
> + return 0;
> +}
> +
> +static int pt_config_reg_init(XenPCIPassthroughState *s,
> + XenPTRegGroup *reg_grp, XenPTRegInfo *reg)
> +{
> + XenPTReg *reg_entry;
> + uint32_t data = 0;
> + int rc = 0;
> +
> + reg_entry = g_new0(XenPTReg, 1);
> + reg_entry->reg = reg;
> +
> + if (reg->init) {
> + /* initialize emulate register */
> + rc = reg->init(s, reg_entry->reg,
> + reg_grp->base_offset + reg->offset, &data);
> + if (rc < 0) {
> + free(reg_entry);
> + return rc;
> + }
> + if (data == PT_INVALID_REG) {
> + /* free unused BAR register entry */
> + free(reg_entry);
> + return 0;
> + }
> + /* set register value */
> + reg_entry->data = data;
> + }
> + /* list add register entry */
> + QLIST_INSERT_HEAD(®_grp->reg_tbl_list, reg_entry, entries);
> +
> + return 0;
> +}
> +
> +int pt_config_init(XenPCIPassthroughState *s)
> +{
> + int i, rc;
> +
> + QLIST_INIT(&s->reg_grp_tbl);
> +
> + for (i = 0; pt_emu_reg_grp_tbl[i].grp_size != 0; i++) {
> + uint32_t reg_grp_offset = 0;
> + XenPTRegGroup *reg_grp_entry = NULL;
> +
> + if (pt_emu_reg_grp_tbl[i].grp_id != 0xFF) {
> + if (pt_hide_dev_cap(s->real_device,
> + pt_emu_reg_grp_tbl[i].grp_id)) {
> + continue;
> + }
> +
> + reg_grp_offset = find_cap_offset(s,
> pt_emu_reg_grp_tbl[i].grp_id);
> +
> + if (!reg_grp_offset) {
> + continue;
> + }
> + }
> +
> + reg_grp_entry = g_new0(XenPTRegGroup, 1);
> + QLIST_INIT(®_grp_entry->reg_tbl_list);
> + QLIST_INSERT_HEAD(&s->reg_grp_tbl, reg_grp_entry, entries);
> +
> + reg_grp_entry->base_offset = reg_grp_offset;
> + reg_grp_entry->reg_grp = pt_emu_reg_grp_tbl + i;
> + if (pt_emu_reg_grp_tbl[i].size_init) {
> + /* get register group size */
> + rc = pt_emu_reg_grp_tbl[i].size_init(s, reg_grp_entry->reg_grp,
> + reg_grp_offset,
> + ®_grp_entry->size);
> + if (rc < 0) {
> + pt_config_delete(s);
> + return rc;
> + }
> + }
> +
> + if (pt_emu_reg_grp_tbl[i].grp_type == GRP_TYPE_EMU) {
> + if (pt_emu_reg_grp_tbl[i].emu_reg_tbl) {
> + int j = 0;
> + XenPTRegInfo *reg_tbl = pt_emu_reg_grp_tbl[i].emu_reg_tbl;
> + /* initialize capability register */
> + for (j = 0; reg_tbl->size != 0; j++, reg_tbl++) {
> + /* initialize capability register */
> + rc = pt_config_reg_init(s, reg_grp_entry, reg_tbl);
> + if (rc < 0) {
> + pt_config_delete(s);
> + return rc;
> + }
> + }
> + }
> + }
> + }
> +
> + return 0;
> +}
> +
> +/* delete all emulate register */
> +void pt_config_delete(XenPCIPassthroughState *s)
> +{
> + struct XenPTRegGroup *reg_group, *next_grp;
> + struct XenPTReg *reg, *next_reg;
> +
> + /* free all register group entry */
> + QLIST_FOREACH_SAFE(reg_group, &s->reg_grp_tbl, entries, next_grp) {
> + /* free all register entry */
> + QLIST_FOREACH_SAFE(reg, ®_group->reg_tbl_list, entries, next_reg)
> {
> + QLIST_REMOVE(reg, entries);
> + g_free(reg);
> + }
> +
> + QLIST_REMOVE(reg_group, entries);
> + g_free(reg_group);
> + }
> +}
> --
> Anthony PERARD
>
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