#include <xen/errno.h>
#include <xen/sched.h>
#include <xen/irq.h>
+#include <xen/vpci.h>
#include <public/hvm/ioreq.h>
#include <asm/hvm/io.h>
#include <asm/hvm/vpic.h>
if ( msixtbl_write(v, ctrl_address, 4, 0) != X86EMUL_OKAY )
gdprintk(XENLOG_WARNING, "MSI-X write completion failure\n");
}
+
+static unsigned int msi_gflags(uint16_t data, uint64_t addr, bool masked)
+{
+ /*
+ * We need to use the DOMCTL constants here because the output of this
+ * function is used as input to pt_irq_create_bind, which also takes the
+ * input from the DOMCTL itself.
+ */
+ return MASK_INSR(MASK_EXTR(addr, MSI_ADDR_DEST_ID_MASK),
+ XEN_DOMCTL_VMSI_X86_DEST_ID_MASK) |
+ MASK_INSR(MASK_EXTR(addr, MSI_ADDR_REDIRECTION_MASK),
+ XEN_DOMCTL_VMSI_X86_RH_MASK) |
+ MASK_INSR(MASK_EXTR(addr, MSI_ADDR_DESTMODE_MASK),
+ XEN_DOMCTL_VMSI_X86_DM_MASK) |
+ MASK_INSR(MASK_EXTR(data, MSI_DATA_DELIVERY_MODE_MASK),
+ XEN_DOMCTL_VMSI_X86_DELIV_MASK) |
+ MASK_INSR(MASK_EXTR(data, MSI_DATA_TRIGGER_MASK),
+ XEN_DOMCTL_VMSI_X86_TRIG_MASK) |
+ /* NB: by default MSI vectors are bound masked. */
+ (masked ? 0 : XEN_DOMCTL_VMSI_X86_UNMASKED);
+}
+
+void vpci_msi_arch_mask(struct vpci_msi *msi, const struct pci_dev *pdev,
+ unsigned int entry, bool mask)
+{
+ unsigned long flags;
+ struct irq_desc *desc = domain_spin_lock_irq_desc(pdev->domain,
+ msi->arch.pirq + entry,
+ &flags);
+
+ if ( !desc )
+ return;
+ guest_mask_msi_irq(desc, mask);
+ spin_unlock_irqrestore(&desc->lock, flags);
+}
+
+int vpci_msi_arch_enable(struct vpci_msi *msi, const struct pci_dev *pdev,
+ unsigned int vectors)
+{
+ struct msi_info msi_info = {
+ .seg = pdev->seg,
+ .bus = pdev->bus,
+ .devfn = pdev->devfn,
+ .entry_nr = vectors,
+ };
+ unsigned int i;
+ int rc;
+
+ ASSERT(msi->arch.pirq == INVALID_PIRQ);
+
+ /* Get a PIRQ. */
+ rc = allocate_and_map_msi_pirq(pdev->domain, -1, &msi->arch.pirq,
+ MAP_PIRQ_TYPE_MULTI_MSI, &msi_info);
+ if ( rc )
+ {
+ gdprintk(XENLOG_ERR, "%04x:%02x:%02x.%u: failed to map PIRQ: %d\n",
+ pdev->seg, pdev->bus, PCI_SLOT(pdev->devfn),
+ PCI_FUNC(pdev->devfn), rc);
+ return rc;
+ }
+
+ for ( i = 0; i < vectors; i++ )
+ {
+ uint8_t vector = MASK_EXTR(msi->data, MSI_DATA_VECTOR_MASK);
+ uint8_t vector_mask = 0xff >> (8 - fls(msi->vectors) + 1);
+ struct xen_domctl_bind_pt_irq bind = {
+ .machine_irq = msi->arch.pirq + i,
+ .irq_type = PT_IRQ_TYPE_MSI,
+ .u.msi.gvec = (vector & ~vector_mask) |
+ ((vector + i) & vector_mask),
+ .u.msi.gflags = msi_gflags(msi->data, msi->address,
+ (msi->mask >> i) & 1),
+ };
+
+ pcidevs_lock();
+ rc = pt_irq_create_bind(pdev->domain, &bind);
+ if ( rc )
+ {
+ gdprintk(XENLOG_ERR,
+ "%04x:%02x:%02x.%u: failed to bind PIRQ %u: %d\n",
+ pdev->seg, pdev->bus, PCI_SLOT(pdev->devfn),
+ PCI_FUNC(pdev->devfn), msi->arch.pirq + i, rc);
+ while ( bind.machine_irq-- )
+ pt_irq_destroy_bind(pdev->domain, &bind);
+ spin_lock(&pdev->domain->event_lock);
+ unmap_domain_pirq(pdev->domain, msi->arch.pirq);
+ spin_unlock(&pdev->domain->event_lock);
+ pcidevs_unlock();
+ msi->arch.pirq = INVALID_PIRQ;
+ return rc;
+ }
+ pcidevs_unlock();
+ }
+
+ return 0;
+}
+
+void vpci_msi_arch_disable(struct vpci_msi *msi, const struct pci_dev *pdev)
+{
+ unsigned int i;
+
+ ASSERT(msi->arch.pirq != INVALID_PIRQ);
+
+ pcidevs_lock();
+ for ( i = 0; i < msi->vectors; i++ )
+ {
+ struct xen_domctl_bind_pt_irq bind = {
+ .machine_irq = msi->arch.pirq + i,
+ .irq_type = PT_IRQ_TYPE_MSI,
+ };
+ int rc;
+
+ rc = pt_irq_destroy_bind(pdev->domain, &bind);
+ ASSERT(!rc);
+ }
+
+ spin_lock(&pdev->domain->event_lock);
+ unmap_domain_pirq(pdev->domain, msi->arch.pirq);
+ spin_unlock(&pdev->domain->event_lock);
+ pcidevs_unlock();
+
+ msi->arch.pirq = INVALID_PIRQ;
+}
+
+void vpci_msi_arch_init(struct vpci_msi *msi)
+{
+ msi->arch.pirq = INVALID_PIRQ;
+}
+
+void vpci_msi_arch_print(const struct vpci_msi *msi)
+{
+ printk("vec=%#02x%7s%6s%3sassert%5s%7s dest_id=%lu pirq: %d\n",
+ MASK_EXTR(msi->data, MSI_DATA_VECTOR_MASK),
+ msi->data & MSI_DATA_DELIVERY_LOWPRI ? "lowest" : "fixed",
+ msi->data & MSI_DATA_TRIGGER_LEVEL ? "level" : "edge",
+ msi->data & MSI_DATA_LEVEL_ASSERT ? "" : "de",
+ msi->address & MSI_ADDR_DESTMODE_LOGIC ? "log" : "phys",
+ msi->address & MSI_ADDR_REDIRECTION_LOWPRI ? "lowest" : "fixed",
+ MASK_EXTR(msi->address, MSI_ADDR_DEST_ID_MASK),
+ msi->arch.pirq);
+}
--- /dev/null
+/*
+ * Handlers for accesses to the MSI capability structure.
+ *
+ * Copyright (C) 2017 Citrix Systems R&D
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms and conditions of the GNU General Public
+ * License, version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <xen/sched.h>
+#include <xen/softirq.h>
+#include <xen/vpci.h>
+
+#include <asm/msi.h>
+
+static uint32_t control_read(const struct pci_dev *pdev, unsigned int reg,
+ void *data)
+{
+ const struct vpci_msi *msi = data;
+
+ return MASK_INSR(fls(msi->max_vectors) - 1, PCI_MSI_FLAGS_QMASK) |
+ MASK_INSR(fls(msi->vectors) - 1, PCI_MSI_FLAGS_QSIZE) |
+ (msi->enabled ? PCI_MSI_FLAGS_ENABLE : 0) |
+ (msi->masking ? PCI_MSI_FLAGS_MASKBIT : 0) |
+ (msi->address64 ? PCI_MSI_FLAGS_64BIT : 0);
+}
+
+static void control_write(const struct pci_dev *pdev, unsigned int reg,
+ uint32_t val, void *data)
+{
+ struct vpci_msi *msi = data;
+ unsigned int vectors = min_t(uint8_t,
+ 1u << MASK_EXTR(val, PCI_MSI_FLAGS_QSIZE),
+ msi->max_vectors);
+ bool new_enabled = val & PCI_MSI_FLAGS_ENABLE;
+
+ /*
+ * No change if the enable field and the number of vectors is
+ * the same or the device is not enabled, in which case the
+ * vectors field can be updated directly.
+ */
+ if ( new_enabled == msi->enabled &&
+ (vectors == msi->vectors || !msi->enabled) )
+ {
+ msi->vectors = vectors;
+ return;
+ }
+
+ if ( new_enabled )
+ {
+ /*
+ * If the device is already enabled it means the number of
+ * enabled messages has changed. Disable and re-enable the
+ * device in order to apply the change.
+ */
+ if ( msi->enabled )
+ {
+ vpci_msi_arch_disable(msi, pdev);
+ msi->enabled = false;
+ }
+
+ if ( vpci_msi_arch_enable(msi, pdev, vectors) )
+ return;
+ }
+ else
+ vpci_msi_arch_disable(msi, pdev);
+
+ msi->vectors = vectors;
+ msi->enabled = new_enabled;
+
+ pci_conf_write16(pdev->seg, pdev->bus, PCI_SLOT(pdev->devfn),
+ PCI_FUNC(pdev->devfn), reg,
+ control_read(pdev, reg, data));
+}
+
+static void update_msi(const struct pci_dev *pdev, struct vpci_msi *msi)
+{
+ if ( !msi->enabled )
+ return;
+
+ vpci_msi_arch_disable(msi, pdev);
+ if ( vpci_msi_arch_enable(msi, pdev, msi->vectors) )
+ msi->enabled = false;
+}
+
+/* Handlers for the address field (32bit or low part of a 64bit address). */
+static uint32_t address_read(const struct pci_dev *pdev, unsigned int reg,
+ void *data)
+{
+ const struct vpci_msi *msi = data;
+
+ return msi->address;
+}
+
+static void address_write(const struct pci_dev *pdev, unsigned int reg,
+ uint32_t val, void *data)
+{
+ struct vpci_msi *msi = data;
+
+ /* Clear low part. */
+ msi->address &= ~0xffffffffull;
+ msi->address |= val;
+
+ update_msi(pdev, msi);
+}
+
+/* Handlers for the high part of a 64bit address field. */
+static uint32_t address_hi_read(const struct pci_dev *pdev, unsigned int reg,
+ void *data)
+{
+ const struct vpci_msi *msi = data;
+
+ return msi->address >> 32;
+}
+
+static void address_hi_write(const struct pci_dev *pdev, unsigned int reg,
+ uint32_t val, void *data)
+{
+ struct vpci_msi *msi = data;
+
+ /* Clear and update high part. */
+ msi->address &= 0xffffffff;
+ msi->address |= (uint64_t)val << 32;
+
+ update_msi(pdev, msi);
+}
+
+/* Handlers for the data field. */
+static uint32_t data_read(const struct pci_dev *pdev, unsigned int reg,
+ void *data)
+{
+ const struct vpci_msi *msi = data;
+
+ return msi->data;
+}
+
+static void data_write(const struct pci_dev *pdev, unsigned int reg,
+ uint32_t val, void *data)
+{
+ struct vpci_msi *msi = data;
+
+ msi->data = val;
+
+ update_msi(pdev, msi);
+}
+
+/* Handlers for the MSI mask bits. */
+static uint32_t mask_read(const struct pci_dev *pdev, unsigned int reg,
+ void *data)
+{
+ const struct vpci_msi *msi = data;
+
+ return msi->mask;
+}
+
+static void mask_write(const struct pci_dev *pdev, unsigned int reg,
+ uint32_t val, void *data)
+{
+ struct vpci_msi *msi = data;
+ uint32_t dmask = msi->mask ^ val;
+
+ if ( !dmask )
+ return;
+
+ if ( msi->enabled )
+ {
+ unsigned int i;
+
+ for ( i = ffs(dmask) - 1; dmask && i < msi->vectors;
+ i = ffs(dmask) - 1 )
+ {
+ vpci_msi_arch_mask(msi, pdev, i, (val >> i) & 1);
+ __clear_bit(i, &dmask);
+ }
+ }
+
+ msi->mask = val;
+}
+
+static int init_msi(struct pci_dev *pdev)
+{
+ uint8_t slot = PCI_SLOT(pdev->devfn), func = PCI_FUNC(pdev->devfn);
+ unsigned int pos = pci_find_cap_offset(pdev->seg, pdev->bus, slot, func,
+ PCI_CAP_ID_MSI);
+ uint16_t control;
+ int ret;
+
+ if ( !pos )
+ return 0;
+
+ pdev->vpci->msi = xzalloc(struct vpci_msi);
+ if ( !pdev->vpci->msi )
+ return -ENOMEM;
+
+ ret = vpci_add_register(pdev->vpci, control_read, control_write,
+ msi_control_reg(pos), 2, pdev->vpci->msi);
+ if ( ret )
+ /*
+ * NB: there's no need to free the msi struct or remove the register
+ * handlers form the config space, the caller will take care of the
+ * cleanup.
+ */
+ return ret;
+
+ /* Get the maximum number of vectors the device supports. */
+ control = pci_conf_read16(pdev->seg, pdev->bus, slot, func,
+ msi_control_reg(pos));
+
+ /*
+ * FIXME: I've only been able to test this code with devices using a single
+ * MSI interrupt and no mask register.
+ */
+ pdev->vpci->msi->max_vectors = multi_msi_capable(control);
+ ASSERT(pdev->vpci->msi->max_vectors <= 32);
+
+ /* The multiple message enable is 0 after reset (1 message enabled). */
+ pdev->vpci->msi->vectors = 1;
+
+ /* No PIRQ bound yet. */
+ vpci_msi_arch_init(pdev->vpci->msi);
+
+ pdev->vpci->msi->address64 = is_64bit_address(control);
+ pdev->vpci->msi->masking = is_mask_bit_support(control);
+
+ ret = vpci_add_register(pdev->vpci, address_read, address_write,
+ msi_lower_address_reg(pos), 4, pdev->vpci->msi);
+ if ( ret )
+ return ret;
+
+ ret = vpci_add_register(pdev->vpci, data_read, data_write,
+ msi_data_reg(pos, pdev->vpci->msi->address64), 2,
+ pdev->vpci->msi);
+ if ( ret )
+ return ret;
+
+ if ( pdev->vpci->msi->address64 )
+ {
+ ret = vpci_add_register(pdev->vpci, address_hi_read, address_hi_write,
+ msi_upper_address_reg(pos), 4, pdev->vpci->msi);
+ if ( ret )
+ return ret;
+ }
+
+ if ( pdev->vpci->msi->masking )
+ {
+ ret = vpci_add_register(pdev->vpci, mask_read, mask_write,
+ msi_mask_bits_reg(pos,
+ pdev->vpci->msi->address64),
+ 4, pdev->vpci->msi);
+ if ( ret )
+ return ret;
+ /*
+ * FIXME: do not add any handler for the pending bits for the hardware
+ * domain, which means direct access. This will be revisited when
+ * adding unprivileged domain support.
+ */
+ }
+
+ return 0;
+}
+REGISTER_VPCI_INIT(init_msi);
+
+void vpci_dump_msi(void)
+{
+ const struct domain *d;
+
+ rcu_read_lock(&domlist_read_lock);
+ for_each_domain ( d )
+ {
+ const struct pci_dev *pdev;
+
+ if ( !has_vpci(d) )
+ continue;
+
+ printk("vPCI MSI d%d\n", d->domain_id);
+
+ list_for_each_entry ( pdev, &d->arch.pdev_list, domain_list )
+ {
+ const struct vpci_msi *msi = pdev->vpci->msi;
+
+ if ( !spin_trylock(&pdev->vpci->lock) )
+ {
+ printk("Unable to get vPCI lock, skipping\n");
+ continue;
+ }
+
+ if ( msi )
+ {
+ printk("%04x:%02x:%02x.%u\n", pdev->seg, pdev->bus,
+ PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
+
+ printk(" enabled: %d 64-bit: %d",
+ msi->enabled, msi->address64);
+ if ( msi->masking )
+ printk(" mask=%08x", msi->mask);
+ printk(" vectors max: %u enabled: %u\n",
+ msi->max_vectors, msi->vectors);
+
+ vpci_msi_arch_print(msi);
+ }
+
+ spin_unlock(&pdev->vpci->lock);
+ process_pending_softirqs();
+ }
+ }
+ rcu_read_unlock(&domlist_read_lock);
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
projects / people / royger / xen.git / commitdiff