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/*
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* Copyright (c) 2007, Intel Corporation.
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Jiang Yunhong <yunhong.jiang@intel.com>
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*
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* This file implements direct PCI assignment to a HVM guest
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*/
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#include <sys/mman.h> |
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#include "xen_backend.h" |
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#include "xen_pt.h" |
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#include "apic-msidef.h" |
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#define XEN_PT_AUTO_ASSIGN -1 |
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/* shift count for gflags */
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#define XEN_PT_GFLAGS_SHIFT_DEST_ID 0 |
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#define XEN_PT_GFLAGS_SHIFT_RH 8 |
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#define XEN_PT_GFLAGS_SHIFT_DM 9 |
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#define XEN_PT_GFLAGSSHIFT_DELIV_MODE 12 |
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#define XEN_PT_GFLAGSSHIFT_TRG_MODE 15 |
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/*
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* Helpers
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*/
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static inline uint8_t msi_vector(uint32_t data) |
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{ |
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return (data & MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
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} |
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static inline uint8_t msi_dest_id(uint32_t addr) |
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{ |
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return (addr & MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
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} |
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static inline uint32_t msi_ext_dest_id(uint32_t addr_hi) |
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{ |
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return addr_hi & 0xffffff00; |
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} |
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static uint32_t msi_gflags(uint32_t data, uint64_t addr)
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{ |
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uint32_t result = 0;
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int rh, dm, dest_id, deliv_mode, trig_mode;
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rh = (addr >> MSI_ADDR_REDIRECTION_SHIFT) & 0x1;
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dm = (addr >> MSI_ADDR_DEST_MODE_SHIFT) & 0x1;
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dest_id = msi_dest_id(addr); |
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deliv_mode = (data >> MSI_DATA_DELIVERY_MODE_SHIFT) & 0x7;
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trig_mode = (data >> MSI_DATA_TRIGGER_SHIFT) & 0x1;
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result = dest_id | (rh << XEN_PT_GFLAGS_SHIFT_RH) |
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| (dm << XEN_PT_GFLAGS_SHIFT_DM) |
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| (deliv_mode << XEN_PT_GFLAGSSHIFT_DELIV_MODE) |
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| (trig_mode << XEN_PT_GFLAGSSHIFT_TRG_MODE); |
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return result;
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} |
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static inline uint64_t msi_addr64(XenPTMSI *msi) |
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{ |
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return (uint64_t)msi->addr_hi << 32 | msi->addr_lo; |
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} |
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static int msi_msix_enable(XenPCIPassthroughState *s, |
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uint32_t address, |
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uint16_t flag, |
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bool enable)
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{ |
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uint16_t val = 0;
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if (!address) {
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return -1; |
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} |
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xen_host_pci_get_word(&s->real_device, address, &val); |
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if (enable) {
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val |= flag; |
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} else {
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val &= ~flag; |
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} |
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xen_host_pci_set_word(&s->real_device, address, val); |
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return 0; |
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} |
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static int msi_msix_setup(XenPCIPassthroughState *s, |
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uint64_t addr, |
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uint32_t data, |
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int *ppirq,
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bool is_msix,
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int msix_entry,
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bool is_not_mapped)
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{ |
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uint8_t gvec = msi_vector(data); |
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int rc = 0; |
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assert((!is_msix && msix_entry == 0) || is_msix);
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if (gvec == 0) { |
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/* if gvec is 0, the guest is asking for a particular pirq that
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* is passed as dest_id */
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*ppirq = msi_ext_dest_id(addr >> 32) | msi_dest_id(addr);
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if (!*ppirq) {
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/* this probably identifies an misconfiguration of the guest,
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* try the emulated path */
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*ppirq = XEN_PT_UNASSIGNED_PIRQ; |
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} else {
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XEN_PT_LOG(&s->dev, "requested pirq %d for MSI%s"
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" (vec: %#x, entry: %#x)\n",
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*ppirq, is_msix ? "-X" : "", gvec, msix_entry); |
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} |
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} |
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if (is_not_mapped) {
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uint64_t table_base = 0;
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if (is_msix) {
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table_base = s->msix->table_base; |
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} |
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rc = xc_physdev_map_pirq_msi(xen_xc, xen_domid, XEN_PT_AUTO_ASSIGN, |
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ppirq, PCI_DEVFN(s->real_device.dev, |
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s->real_device.func), |
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s->real_device.bus, |
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msix_entry, table_base); |
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if (rc) {
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XEN_PT_ERR(&s->dev, |
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"Mapping of MSI%s (rc: %i, vec: %#x, entry %#x)\n",
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is_msix ? "-X" : "", rc, gvec, msix_entry); |
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return rc;
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} |
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} |
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return 0; |
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} |
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static int msi_msix_update(XenPCIPassthroughState *s, |
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uint64_t addr, |
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uint32_t data, |
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int pirq,
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bool is_msix,
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int msix_entry,
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int *old_pirq)
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{ |
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PCIDevice *d = &s->dev; |
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uint8_t gvec = msi_vector(data); |
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uint32_t gflags = msi_gflags(data, addr); |
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int rc = 0; |
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uint64_t table_addr = 0;
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XEN_PT_LOG(d, "Updating MSI%s with pirq %d gvec %#x gflags %#x"
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" (entry: %#x)\n",
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is_msix ? "-X" : "", pirq, gvec, gflags, msix_entry); |
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if (is_msix) {
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table_addr = s->msix->mmio_base_addr; |
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} |
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rc = xc_domain_update_msi_irq(xen_xc, xen_domid, gvec, |
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pirq, gflags, table_addr); |
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if (rc) {
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XEN_PT_ERR(d, "Updating of MSI%s failed. (rc: %d)\n",
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is_msix ? "-X" : "", rc); |
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if (xc_physdev_unmap_pirq(xen_xc, xen_domid, *old_pirq)) {
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XEN_PT_ERR(d, "Unmapping of MSI%s pirq %d failed.\n",
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is_msix ? "-X" : "", *old_pirq); |
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} |
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*old_pirq = XEN_PT_UNASSIGNED_PIRQ; |
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} |
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return rc;
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} |
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static int msi_msix_disable(XenPCIPassthroughState *s, |
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uint64_t addr, |
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uint32_t data, |
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int pirq,
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bool is_msix,
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bool is_binded)
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{ |
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PCIDevice *d = &s->dev; |
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uint8_t gvec = msi_vector(data); |
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uint32_t gflags = msi_gflags(data, addr); |
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int rc = 0; |
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if (pirq == XEN_PT_UNASSIGNED_PIRQ) {
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return 0; |
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} |
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if (is_binded) {
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XEN_PT_LOG(d, "Unbind MSI%s with pirq %d, gvec %#x\n",
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is_msix ? "-X" : "", pirq, gvec); |
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rc = xc_domain_unbind_msi_irq(xen_xc, xen_domid, gvec, pirq, gflags); |
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if (rc) {
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XEN_PT_ERR(d, "Unbinding of MSI%s failed. (pirq: %d, gvec: %#x)\n",
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is_msix ? "-X" : "", pirq, gvec); |
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return rc;
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} |
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} |
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XEN_PT_LOG(d, "Unmap MSI%s pirq %d\n", is_msix ? "-X" : "", pirq); |
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rc = xc_physdev_unmap_pirq(xen_xc, xen_domid, pirq); |
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if (rc) {
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XEN_PT_ERR(d, "Unmapping of MSI%s pirq %d failed. (rc: %i)\n",
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is_msix ? "-X" : "", pirq, rc); |
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return rc;
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} |
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return 0; |
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} |
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/*
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* MSI virtualization functions
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*/
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int xen_pt_msi_set_enable(XenPCIPassthroughState *s, bool enable) |
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{ |
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XEN_PT_LOG(&s->dev, "%s MSI.\n", enable ? "enabling" : "disabling"); |
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if (!s->msi) {
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return -1; |
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} |
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return msi_msix_enable(s, s->msi->ctrl_offset, PCI_MSI_FLAGS_ENABLE,
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enable); |
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} |
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/* setup physical msi, but don't enable it */
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int xen_pt_msi_setup(XenPCIPassthroughState *s)
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{ |
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int pirq = XEN_PT_UNASSIGNED_PIRQ;
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int rc = 0; |
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XenPTMSI *msi = s->msi; |
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if (msi->initialized) {
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XEN_PT_ERR(&s->dev, |
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"Setup physical MSI when it has been properly initialized.\n");
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return -1; |
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} |
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rc = msi_msix_setup(s, msi_addr64(msi), msi->data, &pirq, false, 0, true); |
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if (rc) {
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return rc;
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} |
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if (pirq < 0) { |
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XEN_PT_ERR(&s->dev, "Invalid pirq number: %d.\n", pirq);
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return -1; |
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} |
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msi->pirq = pirq; |
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XEN_PT_LOG(&s->dev, "MSI mapped with pirq %d.\n", pirq);
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return 0; |
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} |
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int xen_pt_msi_update(XenPCIPassthroughState *s)
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{ |
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XenPTMSI *msi = s->msi; |
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return msi_msix_update(s, msi_addr64(msi), msi->data, msi->pirq,
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false, 0, &msi->pirq); |
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} |
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void xen_pt_msi_disable(XenPCIPassthroughState *s)
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{ |
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XenPTMSI *msi = s->msi; |
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if (!msi) {
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return;
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} |
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xen_pt_msi_set_enable(s, false);
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msi_msix_disable(s, msi_addr64(msi), msi->data, msi->pirq, false,
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msi->initialized); |
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/* clear msi info */
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msi->flags = 0;
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msi->mapped = false;
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msi->pirq = XEN_PT_UNASSIGNED_PIRQ; |
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} |
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/*
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* MSI-X virtualization functions
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*/
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static int msix_set_enable(XenPCIPassthroughState *s, bool enabled) |
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{ |
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XEN_PT_LOG(&s->dev, "%s MSI-X.\n", enabled ? "enabling" : "disabling"); |
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if (!s->msix) {
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return -1; |
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} |
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return msi_msix_enable(s, s->msix->ctrl_offset, PCI_MSIX_FLAGS_ENABLE,
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enabled); |
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} |
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static int xen_pt_msix_update_one(XenPCIPassthroughState *s, int entry_nr) |
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{ |
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XenPTMSIXEntry *entry = NULL;
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int pirq;
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int rc;
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if (entry_nr < 0 || entry_nr >= s->msix->total_entries) { |
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return -EINVAL;
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} |
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entry = &s->msix->msix_entry[entry_nr]; |
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if (!entry->updated) {
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return 0; |
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} |
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pirq = entry->pirq; |
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rc = msi_msix_setup(s, entry->data, entry->data, &pirq, true, entry_nr,
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entry->pirq == XEN_PT_UNASSIGNED_PIRQ); |
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if (rc) {
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return rc;
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} |
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if (entry->pirq == XEN_PT_UNASSIGNED_PIRQ) {
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entry->pirq = pirq; |
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} |
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rc = msi_msix_update(s, entry->addr, entry->data, pirq, true,
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entry_nr, &entry->pirq); |
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if (!rc) {
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entry->updated = false;
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} |
339 |
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return rc;
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} |
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int xen_pt_msix_update(XenPCIPassthroughState *s)
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{ |
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XenPTMSIX *msix = s->msix; |
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int i;
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for (i = 0; i < msix->total_entries; i++) { |
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xen_pt_msix_update_one(s, i); |
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} |
351 |
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return 0; |
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} |
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|
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void xen_pt_msix_disable(XenPCIPassthroughState *s)
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{ |
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int i = 0; |
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msix_set_enable(s, false);
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for (i = 0; i < s->msix->total_entries; i++) { |
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XenPTMSIXEntry *entry = &s->msix->msix_entry[i]; |
363 |
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msi_msix_disable(s, entry->addr, entry->data, entry->pirq, true, true); |
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/* clear MSI-X info */
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entry->pirq = XEN_PT_UNASSIGNED_PIRQ; |
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entry->updated = false;
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} |
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} |
371 |
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int xen_pt_msix_update_remap(XenPCIPassthroughState *s, int bar_index) |
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{ |
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XenPTMSIXEntry *entry; |
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int i, ret;
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if (!(s->msix && s->msix->bar_index == bar_index)) {
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return 0; |
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} |
380 |
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for (i = 0; i < s->msix->total_entries; i++) { |
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entry = &s->msix->msix_entry[i]; |
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if (entry->pirq != XEN_PT_UNASSIGNED_PIRQ) {
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ret = xc_domain_unbind_pt_irq(xen_xc, xen_domid, entry->pirq, |
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PT_IRQ_TYPE_MSI, 0, 0, 0, 0); |
386 |
if (ret) {
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XEN_PT_ERR(&s->dev, "unbind MSI-X entry %d failed\n",
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entry->pirq); |
389 |
} |
390 |
entry->updated = true;
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} |
392 |
} |
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return xen_pt_msix_update(s);
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} |
395 |
|
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static uint32_t get_entry_value(XenPTMSIXEntry *e, int offset) |
397 |
{ |
398 |
switch (offset) {
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case PCI_MSIX_ENTRY_LOWER_ADDR:
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400 |
return e->addr & UINT32_MAX;
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case PCI_MSIX_ENTRY_UPPER_ADDR:
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return e->addr >> 32; |
403 |
case PCI_MSIX_ENTRY_DATA:
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404 |
return e->data;
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case PCI_MSIX_ENTRY_VECTOR_CTRL:
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406 |
return e->vector_ctrl;
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default:
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return 0; |
409 |
} |
410 |
} |
411 |
|
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static void set_entry_value(XenPTMSIXEntry *e, int offset, uint32_t val) |
413 |
{ |
414 |
switch (offset) {
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415 |
case PCI_MSIX_ENTRY_LOWER_ADDR:
|
416 |
e->addr = (e->addr & ((uint64_t)UINT32_MAX << 32)) | val;
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417 |
break;
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case PCI_MSIX_ENTRY_UPPER_ADDR:
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e->addr = (uint64_t)val << 32 | (e->addr & UINT32_MAX);
|
420 |
break;
|
421 |
case PCI_MSIX_ENTRY_DATA:
|
422 |
e->data = val; |
423 |
break;
|
424 |
case PCI_MSIX_ENTRY_VECTOR_CTRL:
|
425 |
e->vector_ctrl = val; |
426 |
break;
|
427 |
} |
428 |
} |
429 |
|
430 |
static void pci_msix_write(void *opaque, hwaddr addr, |
431 |
uint64_t val, unsigned size)
|
432 |
{ |
433 |
XenPCIPassthroughState *s = opaque; |
434 |
XenPTMSIX *msix = s->msix; |
435 |
XenPTMSIXEntry *entry; |
436 |
int entry_nr, offset;
|
437 |
|
438 |
entry_nr = addr / PCI_MSIX_ENTRY_SIZE; |
439 |
if (entry_nr < 0 || entry_nr >= msix->total_entries) { |
440 |
XEN_PT_ERR(&s->dev, "asked MSI-X entry '%i' invalid!\n", entry_nr);
|
441 |
return;
|
442 |
} |
443 |
entry = &msix->msix_entry[entry_nr]; |
444 |
offset = addr % PCI_MSIX_ENTRY_SIZE; |
445 |
|
446 |
if (offset != PCI_MSIX_ENTRY_VECTOR_CTRL) {
|
447 |
const volatile uint32_t *vec_ctrl; |
448 |
|
449 |
if (get_entry_value(entry, offset) == val) {
|
450 |
return;
|
451 |
} |
452 |
|
453 |
/*
|
454 |
* If Xen intercepts the mask bit access, entry->vec_ctrl may not be
|
455 |
* up-to-date. Read from hardware directly.
|
456 |
*/
|
457 |
vec_ctrl = s->msix->phys_iomem_base + entry_nr * PCI_MSIX_ENTRY_SIZE |
458 |
+ PCI_MSIX_ENTRY_VECTOR_CTRL; |
459 |
|
460 |
if (msix->enabled && !(*vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT)) {
|
461 |
XEN_PT_ERR(&s->dev, "Can't update msix entry %d since MSI-X is"
|
462 |
" already enabled.\n", entry_nr);
|
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return;
|
464 |
} |
465 |
|
466 |
entry->updated = true;
|
467 |
} |
468 |
|
469 |
set_entry_value(entry, offset, val); |
470 |
|
471 |
if (offset == PCI_MSIX_ENTRY_VECTOR_CTRL) {
|
472 |
if (msix->enabled && !(val & PCI_MSIX_ENTRY_CTRL_MASKBIT)) {
|
473 |
xen_pt_msix_update_one(s, entry_nr); |
474 |
} |
475 |
} |
476 |
} |
477 |
|
478 |
static uint64_t pci_msix_read(void *opaque, hwaddr addr, |
479 |
unsigned size)
|
480 |
{ |
481 |
XenPCIPassthroughState *s = opaque; |
482 |
XenPTMSIX *msix = s->msix; |
483 |
int entry_nr, offset;
|
484 |
|
485 |
entry_nr = addr / PCI_MSIX_ENTRY_SIZE; |
486 |
if (entry_nr < 0) { |
487 |
XEN_PT_ERR(&s->dev, "asked MSI-X entry '%i' invalid!\n", entry_nr);
|
488 |
return 0; |
489 |
} |
490 |
|
491 |
offset = addr % PCI_MSIX_ENTRY_SIZE; |
492 |
|
493 |
if (addr < msix->total_entries * PCI_MSIX_ENTRY_SIZE) {
|
494 |
return get_entry_value(&msix->msix_entry[entry_nr], offset);
|
495 |
} else {
|
496 |
/* Pending Bit Array (PBA) */
|
497 |
return *(uint32_t *)(msix->phys_iomem_base + addr);
|
498 |
} |
499 |
} |
500 |
|
501 |
static const MemoryRegionOps pci_msix_ops = { |
502 |
.read = pci_msix_read, |
503 |
.write = pci_msix_write, |
504 |
.endianness = DEVICE_NATIVE_ENDIAN, |
505 |
.valid = { |
506 |
.min_access_size = 4,
|
507 |
.max_access_size = 4,
|
508 |
.unaligned = false,
|
509 |
}, |
510 |
}; |
511 |
|
512 |
int xen_pt_msix_init(XenPCIPassthroughState *s, uint32_t base)
|
513 |
{ |
514 |
uint8_t id = 0;
|
515 |
uint16_t control = 0;
|
516 |
uint32_t table_off = 0;
|
517 |
int i, total_entries, bar_index;
|
518 |
XenHostPCIDevice *hd = &s->real_device; |
519 |
PCIDevice *d = &s->dev; |
520 |
int fd = -1; |
521 |
XenPTMSIX *msix = NULL;
|
522 |
int rc = 0; |
523 |
|
524 |
rc = xen_host_pci_get_byte(hd, base + PCI_CAP_LIST_ID, &id); |
525 |
if (rc) {
|
526 |
return rc;
|
527 |
} |
528 |
|
529 |
if (id != PCI_CAP_ID_MSIX) {
|
530 |
XEN_PT_ERR(d, "Invalid id %#x base %#x\n", id, base);
|
531 |
return -1; |
532 |
} |
533 |
|
534 |
xen_host_pci_get_word(hd, base + PCI_MSIX_FLAGS, &control); |
535 |
total_entries = control & PCI_MSIX_FLAGS_QSIZE; |
536 |
total_entries += 1;
|
537 |
|
538 |
s->msix = g_malloc0(sizeof (XenPTMSIX)
|
539 |
+ total_entries * sizeof (XenPTMSIXEntry));
|
540 |
msix = s->msix; |
541 |
|
542 |
msix->total_entries = total_entries; |
543 |
for (i = 0; i < total_entries; i++) { |
544 |
msix->msix_entry[i].pirq = XEN_PT_UNASSIGNED_PIRQ; |
545 |
} |
546 |
|
547 |
memory_region_init_io(&msix->mmio, &pci_msix_ops, s, "xen-pci-pt-msix",
|
548 |
(total_entries * PCI_MSIX_ENTRY_SIZE |
549 |
+ XC_PAGE_SIZE - 1)
|
550 |
& XC_PAGE_MASK); |
551 |
|
552 |
xen_host_pci_get_long(hd, base + PCI_MSIX_TABLE, &table_off); |
553 |
bar_index = msix->bar_index = table_off & PCI_MSIX_FLAGS_BIRMASK; |
554 |
table_off = table_off & ~PCI_MSIX_FLAGS_BIRMASK; |
555 |
msix->table_base = s->real_device.io_regions[bar_index].base_addr; |
556 |
XEN_PT_LOG(d, "get MSI-X table BAR base 0x%"PRIx64"\n", msix->table_base); |
557 |
|
558 |
fd = open("/dev/mem", O_RDWR);
|
559 |
if (fd == -1) { |
560 |
rc = -errno; |
561 |
XEN_PT_ERR(d, "Can't open /dev/mem: %s\n", strerror(errno));
|
562 |
goto error_out;
|
563 |
} |
564 |
XEN_PT_LOG(d, "table_off = %#x, total_entries = %d\n",
|
565 |
table_off, total_entries); |
566 |
msix->table_offset_adjust = table_off & 0x0fff;
|
567 |
msix->phys_iomem_base = |
568 |
mmap(NULL,
|
569 |
total_entries * PCI_MSIX_ENTRY_SIZE + msix->table_offset_adjust, |
570 |
PROT_READ, |
571 |
MAP_SHARED | MAP_LOCKED, |
572 |
fd, |
573 |
msix->table_base + table_off - msix->table_offset_adjust); |
574 |
close(fd); |
575 |
if (msix->phys_iomem_base == MAP_FAILED) {
|
576 |
rc = -errno; |
577 |
XEN_PT_ERR(d, "Can't map physical MSI-X table: %s\n", strerror(errno));
|
578 |
goto error_out;
|
579 |
} |
580 |
msix->phys_iomem_base = (char *)msix->phys_iomem_base
|
581 |
+ msix->table_offset_adjust; |
582 |
|
583 |
XEN_PT_LOG(d, "mapping physical MSI-X table to %p\n",
|
584 |
msix->phys_iomem_base); |
585 |
|
586 |
memory_region_add_subregion_overlap(&s->bar[bar_index], table_off, |
587 |
&msix->mmio, |
588 |
2); /* Priority: pci default + 1 */ |
589 |
|
590 |
return 0; |
591 |
|
592 |
error_out:
|
593 |
memory_region_destroy(&msix->mmio); |
594 |
g_free(s->msix); |
595 |
s->msix = NULL;
|
596 |
return rc;
|
597 |
} |
598 |
|
599 |
void xen_pt_msix_delete(XenPCIPassthroughState *s)
|
600 |
{ |
601 |
XenPTMSIX *msix = s->msix; |
602 |
|
603 |
if (!msix) {
|
604 |
return;
|
605 |
} |
606 |
|
607 |
/* unmap the MSI-X memory mapped register area */
|
608 |
if (msix->phys_iomem_base) {
|
609 |
XEN_PT_LOG(&s->dev, "unmapping physical MSI-X table from %p\n",
|
610 |
msix->phys_iomem_base); |
611 |
munmap(msix->phys_iomem_base, msix->total_entries * PCI_MSIX_ENTRY_SIZE |
612 |
+ msix->table_offset_adjust); |
613 |
} |
614 |
|
615 |
memory_region_del_subregion(&s->bar[msix->bar_index], &msix->mmio); |
616 |
memory_region_destroy(&msix->mmio); |
617 |
|
618 |
g_free(s->msix); |
619 |
s->msix = NULL;
|
620 |
} |