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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/pci/controller/vmd.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/pci/controller/vmd.c')
-rw-r--r--drivers/pci/controller/vmd.c1135
1 files changed, 1135 insertions, 0 deletions
diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
new file mode 100644
index 0000000000..6ac0afae0c
--- /dev/null
+++ b/drivers/pci/controller/vmd.c
@@ -0,0 +1,1135 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Volume Management Device driver
+ * Copyright (c) 2015, Intel Corporation.
+ */
+
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/pci.h>
+#include <linux/pci-acpi.h>
+#include <linux/pci-ecam.h>
+#include <linux/srcu.h>
+#include <linux/rculist.h>
+#include <linux/rcupdate.h>
+
+#include <asm/irqdomain.h>
+
+#define VMD_CFGBAR 0
+#define VMD_MEMBAR1 2
+#define VMD_MEMBAR2 4
+
+#define PCI_REG_VMCAP 0x40
+#define BUS_RESTRICT_CAP(vmcap) (vmcap & 0x1)
+#define PCI_REG_VMCONFIG 0x44
+#define BUS_RESTRICT_CFG(vmcfg) ((vmcfg >> 8) & 0x3)
+#define VMCONFIG_MSI_REMAP 0x2
+#define PCI_REG_VMLOCK 0x70
+#define MB2_SHADOW_EN(vmlock) (vmlock & 0x2)
+
+#define MB2_SHADOW_OFFSET 0x2000
+#define MB2_SHADOW_SIZE 16
+
+enum vmd_features {
+ /*
+ * Device may contain registers which hint the physical location of the
+ * membars, in order to allow proper address translation during
+ * resource assignment to enable guest virtualization
+ */
+ VMD_FEAT_HAS_MEMBAR_SHADOW = (1 << 0),
+
+ /*
+ * Device may provide root port configuration information which limits
+ * bus numbering
+ */
+ VMD_FEAT_HAS_BUS_RESTRICTIONS = (1 << 1),
+
+ /*
+ * Device contains physical location shadow registers in
+ * vendor-specific capability space
+ */
+ VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP = (1 << 2),
+
+ /*
+ * Device may use MSI-X vector 0 for software triggering and will not
+ * be used for MSI remapping
+ */
+ VMD_FEAT_OFFSET_FIRST_VECTOR = (1 << 3),
+
+ /*
+ * Device can bypass remapping MSI-X transactions into its MSI-X table,
+ * avoiding the requirement of a VMD MSI domain for child device
+ * interrupt handling.
+ */
+ VMD_FEAT_CAN_BYPASS_MSI_REMAP = (1 << 4),
+
+ /*
+ * Enable ASPM on the PCIE root ports and set the default LTR of the
+ * storage devices on platforms where these values are not configured by
+ * BIOS. This is needed for laptops, which require these settings for
+ * proper power management of the SoC.
+ */
+ VMD_FEAT_BIOS_PM_QUIRK = (1 << 5),
+};
+
+#define VMD_BIOS_PM_QUIRK_LTR 0x1003 /* 3145728 ns */
+
+#define VMD_FEATS_CLIENT (VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP | \
+ VMD_FEAT_HAS_BUS_RESTRICTIONS | \
+ VMD_FEAT_OFFSET_FIRST_VECTOR | \
+ VMD_FEAT_BIOS_PM_QUIRK)
+
+static DEFINE_IDA(vmd_instance_ida);
+
+/*
+ * Lock for manipulating VMD IRQ lists.
+ */
+static DEFINE_RAW_SPINLOCK(list_lock);
+
+/**
+ * struct vmd_irq - private data to map driver IRQ to the VMD shared vector
+ * @node: list item for parent traversal.
+ * @irq: back pointer to parent.
+ * @enabled: true if driver enabled IRQ
+ * @virq: the virtual IRQ value provided to the requesting driver.
+ *
+ * Every MSI/MSI-X IRQ requested for a device in a VMD domain will be mapped to
+ * a VMD IRQ using this structure.
+ */
+struct vmd_irq {
+ struct list_head node;
+ struct vmd_irq_list *irq;
+ bool enabled;
+ unsigned int virq;
+};
+
+/**
+ * struct vmd_irq_list - list of driver requested IRQs mapping to a VMD vector
+ * @irq_list: the list of irq's the VMD one demuxes to.
+ * @srcu: SRCU struct for local synchronization.
+ * @count: number of child IRQs assigned to this vector; used to track
+ * sharing.
+ * @virq: The underlying VMD Linux interrupt number
+ */
+struct vmd_irq_list {
+ struct list_head irq_list;
+ struct srcu_struct srcu;
+ unsigned int count;
+ unsigned int virq;
+};
+
+struct vmd_dev {
+ struct pci_dev *dev;
+
+ spinlock_t cfg_lock;
+ void __iomem *cfgbar;
+
+ int msix_count;
+ struct vmd_irq_list *irqs;
+
+ struct pci_sysdata sysdata;
+ struct resource resources[3];
+ struct irq_domain *irq_domain;
+ struct pci_bus *bus;
+ u8 busn_start;
+ u8 first_vec;
+ char *name;
+ int instance;
+};
+
+static inline struct vmd_dev *vmd_from_bus(struct pci_bus *bus)
+{
+ return container_of(bus->sysdata, struct vmd_dev, sysdata);
+}
+
+static inline unsigned int index_from_irqs(struct vmd_dev *vmd,
+ struct vmd_irq_list *irqs)
+{
+ return irqs - vmd->irqs;
+}
+
+/*
+ * Drivers managing a device in a VMD domain allocate their own IRQs as before,
+ * but the MSI entry for the hardware it's driving will be programmed with a
+ * destination ID for the VMD MSI-X table. The VMD muxes interrupts in its
+ * domain into one of its own, and the VMD driver de-muxes these for the
+ * handlers sharing that VMD IRQ. The vmd irq_domain provides the operations
+ * and irq_chip to set this up.
+ */
+static void vmd_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ struct vmd_irq *vmdirq = data->chip_data;
+ struct vmd_irq_list *irq = vmdirq->irq;
+ struct vmd_dev *vmd = irq_data_get_irq_handler_data(data);
+
+ memset(msg, 0, sizeof(*msg));
+ msg->address_hi = X86_MSI_BASE_ADDRESS_HIGH;
+ msg->arch_addr_lo.base_address = X86_MSI_BASE_ADDRESS_LOW;
+ msg->arch_addr_lo.destid_0_7 = index_from_irqs(vmd, irq);
+}
+
+/*
+ * We rely on MSI_FLAG_USE_DEF_CHIP_OPS to set the IRQ mask/unmask ops.
+ */
+static void vmd_irq_enable(struct irq_data *data)
+{
+ struct vmd_irq *vmdirq = data->chip_data;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&list_lock, flags);
+ WARN_ON(vmdirq->enabled);
+ list_add_tail_rcu(&vmdirq->node, &vmdirq->irq->irq_list);
+ vmdirq->enabled = true;
+ raw_spin_unlock_irqrestore(&list_lock, flags);
+
+ data->chip->irq_unmask(data);
+}
+
+static void vmd_irq_disable(struct irq_data *data)
+{
+ struct vmd_irq *vmdirq = data->chip_data;
+ unsigned long flags;
+
+ data->chip->irq_mask(data);
+
+ raw_spin_lock_irqsave(&list_lock, flags);
+ if (vmdirq->enabled) {
+ list_del_rcu(&vmdirq->node);
+ vmdirq->enabled = false;
+ }
+ raw_spin_unlock_irqrestore(&list_lock, flags);
+}
+
+/*
+ * XXX: Stubbed until we develop acceptable way to not create conflicts with
+ * other devices sharing the same vector.
+ */
+static int vmd_irq_set_affinity(struct irq_data *data,
+ const struct cpumask *dest, bool force)
+{
+ return -EINVAL;
+}
+
+static struct irq_chip vmd_msi_controller = {
+ .name = "VMD-MSI",
+ .irq_enable = vmd_irq_enable,
+ .irq_disable = vmd_irq_disable,
+ .irq_compose_msi_msg = vmd_compose_msi_msg,
+ .irq_set_affinity = vmd_irq_set_affinity,
+};
+
+static irq_hw_number_t vmd_get_hwirq(struct msi_domain_info *info,
+ msi_alloc_info_t *arg)
+{
+ return 0;
+}
+
+/*
+ * XXX: We can be even smarter selecting the best IRQ once we solve the
+ * affinity problem.
+ */
+static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *desc)
+{
+ unsigned long flags;
+ int i, best;
+
+ if (vmd->msix_count == 1 + vmd->first_vec)
+ return &vmd->irqs[vmd->first_vec];
+
+ /*
+ * White list for fast-interrupt handlers. All others will share the
+ * "slow" interrupt vector.
+ */
+ switch (msi_desc_to_pci_dev(desc)->class) {
+ case PCI_CLASS_STORAGE_EXPRESS:
+ break;
+ default:
+ return &vmd->irqs[vmd->first_vec];
+ }
+
+ raw_spin_lock_irqsave(&list_lock, flags);
+ best = vmd->first_vec + 1;
+ for (i = best; i < vmd->msix_count; i++)
+ if (vmd->irqs[i].count < vmd->irqs[best].count)
+ best = i;
+ vmd->irqs[best].count++;
+ raw_spin_unlock_irqrestore(&list_lock, flags);
+
+ return &vmd->irqs[best];
+}
+
+static int vmd_msi_init(struct irq_domain *domain, struct msi_domain_info *info,
+ unsigned int virq, irq_hw_number_t hwirq,
+ msi_alloc_info_t *arg)
+{
+ struct msi_desc *desc = arg->desc;
+ struct vmd_dev *vmd = vmd_from_bus(msi_desc_to_pci_dev(desc)->bus);
+ struct vmd_irq *vmdirq = kzalloc(sizeof(*vmdirq), GFP_KERNEL);
+
+ if (!vmdirq)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&vmdirq->node);
+ vmdirq->irq = vmd_next_irq(vmd, desc);
+ vmdirq->virq = virq;
+
+ irq_domain_set_info(domain, virq, vmdirq->irq->virq, info->chip, vmdirq,
+ handle_untracked_irq, vmd, NULL);
+ return 0;
+}
+
+static void vmd_msi_free(struct irq_domain *domain,
+ struct msi_domain_info *info, unsigned int virq)
+{
+ struct vmd_irq *vmdirq = irq_get_chip_data(virq);
+ unsigned long flags;
+
+ synchronize_srcu(&vmdirq->irq->srcu);
+
+ /* XXX: Potential optimization to rebalance */
+ raw_spin_lock_irqsave(&list_lock, flags);
+ vmdirq->irq->count--;
+ raw_spin_unlock_irqrestore(&list_lock, flags);
+
+ kfree(vmdirq);
+}
+
+static int vmd_msi_prepare(struct irq_domain *domain, struct device *dev,
+ int nvec, msi_alloc_info_t *arg)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
+
+ if (nvec > vmd->msix_count)
+ return vmd->msix_count;
+
+ memset(arg, 0, sizeof(*arg));
+ return 0;
+}
+
+static void vmd_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
+{
+ arg->desc = desc;
+}
+
+static struct msi_domain_ops vmd_msi_domain_ops = {
+ .get_hwirq = vmd_get_hwirq,
+ .msi_init = vmd_msi_init,
+ .msi_free = vmd_msi_free,
+ .msi_prepare = vmd_msi_prepare,
+ .set_desc = vmd_set_desc,
+};
+
+static struct msi_domain_info vmd_msi_domain_info = {
+ .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+ MSI_FLAG_PCI_MSIX,
+ .ops = &vmd_msi_domain_ops,
+ .chip = &vmd_msi_controller,
+};
+
+static void vmd_set_msi_remapping(struct vmd_dev *vmd, bool enable)
+{
+ u16 reg;
+
+ pci_read_config_word(vmd->dev, PCI_REG_VMCONFIG, &reg);
+ reg = enable ? (reg & ~VMCONFIG_MSI_REMAP) :
+ (reg | VMCONFIG_MSI_REMAP);
+ pci_write_config_word(vmd->dev, PCI_REG_VMCONFIG, reg);
+}
+
+static int vmd_create_irq_domain(struct vmd_dev *vmd)
+{
+ struct fwnode_handle *fn;
+
+ fn = irq_domain_alloc_named_id_fwnode("VMD-MSI", vmd->sysdata.domain);
+ if (!fn)
+ return -ENODEV;
+
+ vmd->irq_domain = pci_msi_create_irq_domain(fn, &vmd_msi_domain_info, NULL);
+ if (!vmd->irq_domain) {
+ irq_domain_free_fwnode(fn);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void vmd_remove_irq_domain(struct vmd_dev *vmd)
+{
+ /*
+ * Some production BIOS won't enable remapping between soft reboots.
+ * Ensure remapping is restored before unloading the driver.
+ */
+ if (!vmd->msix_count)
+ vmd_set_msi_remapping(vmd, true);
+
+ if (vmd->irq_domain) {
+ struct fwnode_handle *fn = vmd->irq_domain->fwnode;
+
+ irq_domain_remove(vmd->irq_domain);
+ irq_domain_free_fwnode(fn);
+ }
+}
+
+static void __iomem *vmd_cfg_addr(struct vmd_dev *vmd, struct pci_bus *bus,
+ unsigned int devfn, int reg, int len)
+{
+ unsigned int busnr_ecam = bus->number - vmd->busn_start;
+ u32 offset = PCIE_ECAM_OFFSET(busnr_ecam, devfn, reg);
+
+ if (offset + len >= resource_size(&vmd->dev->resource[VMD_CFGBAR]))
+ return NULL;
+
+ return vmd->cfgbar + offset;
+}
+
+/*
+ * CPU may deadlock if config space is not serialized on some versions of this
+ * hardware, so all config space access is done under a spinlock.
+ */
+static int vmd_pci_read(struct pci_bus *bus, unsigned int devfn, int reg,
+ int len, u32 *value)
+{
+ struct vmd_dev *vmd = vmd_from_bus(bus);
+ void __iomem *addr = vmd_cfg_addr(vmd, bus, devfn, reg, len);
+ unsigned long flags;
+ int ret = 0;
+
+ if (!addr)
+ return -EFAULT;
+
+ spin_lock_irqsave(&vmd->cfg_lock, flags);
+ switch (len) {
+ case 1:
+ *value = readb(addr);
+ break;
+ case 2:
+ *value = readw(addr);
+ break;
+ case 4:
+ *value = readl(addr);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ spin_unlock_irqrestore(&vmd->cfg_lock, flags);
+ return ret;
+}
+
+/*
+ * VMD h/w converts non-posted config writes to posted memory writes. The
+ * read-back in this function forces the completion so it returns only after
+ * the config space was written, as expected.
+ */
+static int vmd_pci_write(struct pci_bus *bus, unsigned int devfn, int reg,
+ int len, u32 value)
+{
+ struct vmd_dev *vmd = vmd_from_bus(bus);
+ void __iomem *addr = vmd_cfg_addr(vmd, bus, devfn, reg, len);
+ unsigned long flags;
+ int ret = 0;
+
+ if (!addr)
+ return -EFAULT;
+
+ spin_lock_irqsave(&vmd->cfg_lock, flags);
+ switch (len) {
+ case 1:
+ writeb(value, addr);
+ readb(addr);
+ break;
+ case 2:
+ writew(value, addr);
+ readw(addr);
+ break;
+ case 4:
+ writel(value, addr);
+ readl(addr);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ spin_unlock_irqrestore(&vmd->cfg_lock, flags);
+ return ret;
+}
+
+static struct pci_ops vmd_ops = {
+ .read = vmd_pci_read,
+ .write = vmd_pci_write,
+};
+
+#ifdef CONFIG_ACPI
+static struct acpi_device *vmd_acpi_find_companion(struct pci_dev *pci_dev)
+{
+ struct pci_host_bridge *bridge;
+ u32 busnr, addr;
+
+ if (pci_dev->bus->ops != &vmd_ops)
+ return NULL;
+
+ bridge = pci_find_host_bridge(pci_dev->bus);
+ busnr = pci_dev->bus->number - bridge->bus->number;
+ /*
+ * The address computation below is only applicable to relative bus
+ * numbers below 32.
+ */
+ if (busnr > 31)
+ return NULL;
+
+ addr = (busnr << 24) | ((u32)pci_dev->devfn << 16) | 0x8000FFFFU;
+
+ dev_dbg(&pci_dev->dev, "Looking for ACPI companion (address 0x%x)\n",
+ addr);
+
+ return acpi_find_child_device(ACPI_COMPANION(bridge->dev.parent), addr,
+ false);
+}
+
+static bool hook_installed;
+
+static void vmd_acpi_begin(void)
+{
+ if (pci_acpi_set_companion_lookup_hook(vmd_acpi_find_companion))
+ return;
+
+ hook_installed = true;
+}
+
+static void vmd_acpi_end(void)
+{
+ if (!hook_installed)
+ return;
+
+ pci_acpi_clear_companion_lookup_hook();
+ hook_installed = false;
+}
+#else
+static inline void vmd_acpi_begin(void) { }
+static inline void vmd_acpi_end(void) { }
+#endif /* CONFIG_ACPI */
+
+static void vmd_domain_reset(struct vmd_dev *vmd)
+{
+ u16 bus, max_buses = resource_size(&vmd->resources[0]);
+ u8 dev, functions, fn, hdr_type;
+ char __iomem *base;
+
+ for (bus = 0; bus < max_buses; bus++) {
+ for (dev = 0; dev < 32; dev++) {
+ base = vmd->cfgbar + PCIE_ECAM_OFFSET(bus,
+ PCI_DEVFN(dev, 0), 0);
+
+ hdr_type = readb(base + PCI_HEADER_TYPE);
+
+ functions = (hdr_type & 0x80) ? 8 : 1;
+ for (fn = 0; fn < functions; fn++) {
+ base = vmd->cfgbar + PCIE_ECAM_OFFSET(bus,
+ PCI_DEVFN(dev, fn), 0);
+
+ hdr_type = readb(base + PCI_HEADER_TYPE) &
+ PCI_HEADER_TYPE_MASK;
+
+ if (hdr_type != PCI_HEADER_TYPE_BRIDGE ||
+ (readw(base + PCI_CLASS_DEVICE) !=
+ PCI_CLASS_BRIDGE_PCI))
+ continue;
+
+ /*
+ * Temporarily disable the I/O range before updating
+ * PCI_IO_BASE.
+ */
+ writel(0x0000ffff, base + PCI_IO_BASE_UPPER16);
+ /* Update lower 16 bits of I/O base/limit */
+ writew(0x00f0, base + PCI_IO_BASE);
+ /* Update upper 16 bits of I/O base/limit */
+ writel(0, base + PCI_IO_BASE_UPPER16);
+
+ /* MMIO Base/Limit */
+ writel(0x0000fff0, base + PCI_MEMORY_BASE);
+
+ /* Prefetchable MMIO Base/Limit */
+ writel(0, base + PCI_PREF_LIMIT_UPPER32);
+ writel(0x0000fff0, base + PCI_PREF_MEMORY_BASE);
+ writel(0xffffffff, base + PCI_PREF_BASE_UPPER32);
+ }
+ }
+ }
+}
+
+static void vmd_attach_resources(struct vmd_dev *vmd)
+{
+ vmd->dev->resource[VMD_MEMBAR1].child = &vmd->resources[1];
+ vmd->dev->resource[VMD_MEMBAR2].child = &vmd->resources[2];
+}
+
+static void vmd_detach_resources(struct vmd_dev *vmd)
+{
+ vmd->dev->resource[VMD_MEMBAR1].child = NULL;
+ vmd->dev->resource[VMD_MEMBAR2].child = NULL;
+}
+
+/*
+ * VMD domains start at 0x10000 to not clash with ACPI _SEG domains.
+ * Per ACPI r6.0, sec 6.5.6, _SEG returns an integer, of which the lower
+ * 16 bits are the PCI Segment Group (domain) number. Other bits are
+ * currently reserved.
+ */
+static int vmd_find_free_domain(void)
+{
+ int domain = 0xffff;
+ struct pci_bus *bus = NULL;
+
+ while ((bus = pci_find_next_bus(bus)) != NULL)
+ domain = max_t(int, domain, pci_domain_nr(bus));
+ return domain + 1;
+}
+
+static int vmd_get_phys_offsets(struct vmd_dev *vmd, bool native_hint,
+ resource_size_t *offset1,
+ resource_size_t *offset2)
+{
+ struct pci_dev *dev = vmd->dev;
+ u64 phys1, phys2;
+
+ if (native_hint) {
+ u32 vmlock;
+ int ret;
+
+ ret = pci_read_config_dword(dev, PCI_REG_VMLOCK, &vmlock);
+ if (ret || PCI_POSSIBLE_ERROR(vmlock))
+ return -ENODEV;
+
+ if (MB2_SHADOW_EN(vmlock)) {
+ void __iomem *membar2;
+
+ membar2 = pci_iomap(dev, VMD_MEMBAR2, 0);
+ if (!membar2)
+ return -ENOMEM;
+ phys1 = readq(membar2 + MB2_SHADOW_OFFSET);
+ phys2 = readq(membar2 + MB2_SHADOW_OFFSET + 8);
+ pci_iounmap(dev, membar2);
+ } else
+ return 0;
+ } else {
+ /* Hypervisor-Emulated Vendor-Specific Capability */
+ int pos = pci_find_capability(dev, PCI_CAP_ID_VNDR);
+ u32 reg, regu;
+
+ pci_read_config_dword(dev, pos + 4, &reg);
+
+ /* "SHDW" */
+ if (pos && reg == 0x53484457) {
+ pci_read_config_dword(dev, pos + 8, &reg);
+ pci_read_config_dword(dev, pos + 12, &regu);
+ phys1 = (u64) regu << 32 | reg;
+
+ pci_read_config_dword(dev, pos + 16, &reg);
+ pci_read_config_dword(dev, pos + 20, &regu);
+ phys2 = (u64) regu << 32 | reg;
+ } else
+ return 0;
+ }
+
+ *offset1 = dev->resource[VMD_MEMBAR1].start -
+ (phys1 & PCI_BASE_ADDRESS_MEM_MASK);
+ *offset2 = dev->resource[VMD_MEMBAR2].start -
+ (phys2 & PCI_BASE_ADDRESS_MEM_MASK);
+
+ return 0;
+}
+
+static int vmd_get_bus_number_start(struct vmd_dev *vmd)
+{
+ struct pci_dev *dev = vmd->dev;
+ u16 reg;
+
+ pci_read_config_word(dev, PCI_REG_VMCAP, &reg);
+ if (BUS_RESTRICT_CAP(reg)) {
+ pci_read_config_word(dev, PCI_REG_VMCONFIG, &reg);
+
+ switch (BUS_RESTRICT_CFG(reg)) {
+ case 0:
+ vmd->busn_start = 0;
+ break;
+ case 1:
+ vmd->busn_start = 128;
+ break;
+ case 2:
+ vmd->busn_start = 224;
+ break;
+ default:
+ pci_err(dev, "Unknown Bus Offset Setting (%d)\n",
+ BUS_RESTRICT_CFG(reg));
+ return -ENODEV;
+ }
+ }
+
+ return 0;
+}
+
+static irqreturn_t vmd_irq(int irq, void *data)
+{
+ struct vmd_irq_list *irqs = data;
+ struct vmd_irq *vmdirq;
+ int idx;
+
+ idx = srcu_read_lock(&irqs->srcu);
+ list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node)
+ generic_handle_irq(vmdirq->virq);
+ srcu_read_unlock(&irqs->srcu, idx);
+
+ return IRQ_HANDLED;
+}
+
+static int vmd_alloc_irqs(struct vmd_dev *vmd)
+{
+ struct pci_dev *dev = vmd->dev;
+ int i, err;
+
+ vmd->msix_count = pci_msix_vec_count(dev);
+ if (vmd->msix_count < 0)
+ return -ENODEV;
+
+ vmd->msix_count = pci_alloc_irq_vectors(dev, vmd->first_vec + 1,
+ vmd->msix_count, PCI_IRQ_MSIX);
+ if (vmd->msix_count < 0)
+ return vmd->msix_count;
+
+ vmd->irqs = devm_kcalloc(&dev->dev, vmd->msix_count, sizeof(*vmd->irqs),
+ GFP_KERNEL);
+ if (!vmd->irqs)
+ return -ENOMEM;
+
+ for (i = 0; i < vmd->msix_count; i++) {
+ err = init_srcu_struct(&vmd->irqs[i].srcu);
+ if (err)
+ return err;
+
+ INIT_LIST_HEAD(&vmd->irqs[i].irq_list);
+ vmd->irqs[i].virq = pci_irq_vector(dev, i);
+ err = devm_request_irq(&dev->dev, vmd->irqs[i].virq,
+ vmd_irq, IRQF_NO_THREAD,
+ vmd->name, &vmd->irqs[i]);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+/*
+ * Since VMD is an aperture to regular PCIe root ports, only allow it to
+ * control features that the OS is allowed to control on the physical PCI bus.
+ */
+static void vmd_copy_host_bridge_flags(struct pci_host_bridge *root_bridge,
+ struct pci_host_bridge *vmd_bridge)
+{
+ vmd_bridge->native_pcie_hotplug = root_bridge->native_pcie_hotplug;
+ vmd_bridge->native_shpc_hotplug = root_bridge->native_shpc_hotplug;
+ vmd_bridge->native_aer = root_bridge->native_aer;
+ vmd_bridge->native_pme = root_bridge->native_pme;
+ vmd_bridge->native_ltr = root_bridge->native_ltr;
+ vmd_bridge->native_dpc = root_bridge->native_dpc;
+}
+
+/*
+ * Enable ASPM and LTR settings on devices that aren't configured by BIOS.
+ */
+static int vmd_pm_enable_quirk(struct pci_dev *pdev, void *userdata)
+{
+ unsigned long features = *(unsigned long *)userdata;
+ u16 ltr = VMD_BIOS_PM_QUIRK_LTR;
+ u32 ltr_reg;
+ int pos;
+
+ if (!(features & VMD_FEAT_BIOS_PM_QUIRK))
+ return 0;
+
+ pci_enable_link_state_locked(pdev, PCIE_LINK_STATE_ALL);
+
+ pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_LTR);
+ if (!pos)
+ return 0;
+
+ /*
+ * Skip if the max snoop LTR is non-zero, indicating BIOS has set it
+ * so the LTR quirk is not needed.
+ */
+ pci_read_config_dword(pdev, pos + PCI_LTR_MAX_SNOOP_LAT, &ltr_reg);
+ if (!!(ltr_reg & (PCI_LTR_VALUE_MASK | PCI_LTR_SCALE_MASK)))
+ return 0;
+
+ /*
+ * Set the default values to the maximum required by the platform to
+ * allow the deepest power management savings. Write as a DWORD where
+ * the lower word is the max snoop latency and the upper word is the
+ * max non-snoop latency.
+ */
+ ltr_reg = (ltr << 16) | ltr;
+ pci_write_config_dword(pdev, pos + PCI_LTR_MAX_SNOOP_LAT, ltr_reg);
+ pci_info(pdev, "VMD: Default LTR value set by driver\n");
+
+ return 0;
+}
+
+static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
+{
+ struct pci_sysdata *sd = &vmd->sysdata;
+ struct resource *res;
+ u32 upper_bits;
+ unsigned long flags;
+ LIST_HEAD(resources);
+ resource_size_t offset[2] = {0};
+ resource_size_t membar2_offset = 0x2000;
+ struct pci_bus *child;
+ struct pci_dev *dev;
+ int ret;
+
+ /*
+ * Shadow registers may exist in certain VMD device ids which allow
+ * guests to correctly assign host physical addresses to the root ports
+ * and child devices. These registers will either return the host value
+ * or 0, depending on an enable bit in the VMD device.
+ */
+ if (features & VMD_FEAT_HAS_MEMBAR_SHADOW) {
+ membar2_offset = MB2_SHADOW_OFFSET + MB2_SHADOW_SIZE;
+ ret = vmd_get_phys_offsets(vmd, true, &offset[0], &offset[1]);
+ if (ret)
+ return ret;
+ } else if (features & VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP) {
+ ret = vmd_get_phys_offsets(vmd, false, &offset[0], &offset[1]);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * Certain VMD devices may have a root port configuration option which
+ * limits the bus range to between 0-127, 128-255, or 224-255
+ */
+ if (features & VMD_FEAT_HAS_BUS_RESTRICTIONS) {
+ ret = vmd_get_bus_number_start(vmd);
+ if (ret)
+ return ret;
+ }
+
+ res = &vmd->dev->resource[VMD_CFGBAR];
+ vmd->resources[0] = (struct resource) {
+ .name = "VMD CFGBAR",
+ .start = vmd->busn_start,
+ .end = vmd->busn_start + (resource_size(res) >> 20) - 1,
+ .flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED,
+ };
+
+ /*
+ * If the window is below 4GB, clear IORESOURCE_MEM_64 so we can
+ * put 32-bit resources in the window.
+ *
+ * There's no hardware reason why a 64-bit window *couldn't*
+ * contain a 32-bit resource, but pbus_size_mem() computes the
+ * bridge window size assuming a 64-bit window will contain no
+ * 32-bit resources. __pci_assign_resource() enforces that
+ * artificial restriction to make sure everything will fit.
+ *
+ * The only way we could use a 64-bit non-prefetchable MEMBAR is
+ * if its address is <4GB so that we can convert it to a 32-bit
+ * resource. To be visible to the host OS, all VMD endpoints must
+ * be initially configured by platform BIOS, which includes setting
+ * up these resources. We can assume the device is configured
+ * according to the platform needs.
+ */
+ res = &vmd->dev->resource[VMD_MEMBAR1];
+ upper_bits = upper_32_bits(res->end);
+ flags = res->flags & ~IORESOURCE_SIZEALIGN;
+ if (!upper_bits)
+ flags &= ~IORESOURCE_MEM_64;
+ vmd->resources[1] = (struct resource) {
+ .name = "VMD MEMBAR1",
+ .start = res->start,
+ .end = res->end,
+ .flags = flags,
+ .parent = res,
+ };
+
+ res = &vmd->dev->resource[VMD_MEMBAR2];
+ upper_bits = upper_32_bits(res->end);
+ flags = res->flags & ~IORESOURCE_SIZEALIGN;
+ if (!upper_bits)
+ flags &= ~IORESOURCE_MEM_64;
+ vmd->resources[2] = (struct resource) {
+ .name = "VMD MEMBAR2",
+ .start = res->start + membar2_offset,
+ .end = res->end,
+ .flags = flags,
+ .parent = res,
+ };
+
+ sd->vmd_dev = vmd->dev;
+ sd->domain = vmd_find_free_domain();
+ if (sd->domain < 0)
+ return sd->domain;
+
+ sd->node = pcibus_to_node(vmd->dev->bus);
+
+ /*
+ * Currently MSI remapping must be enabled in guest passthrough mode
+ * due to some missing interrupt remapping plumbing. This is probably
+ * acceptable because the guest is usually CPU-limited and MSI
+ * remapping doesn't become a performance bottleneck.
+ */
+ if (!(features & VMD_FEAT_CAN_BYPASS_MSI_REMAP) ||
+ offset[0] || offset[1]) {
+ ret = vmd_alloc_irqs(vmd);
+ if (ret)
+ return ret;
+
+ vmd_set_msi_remapping(vmd, true);
+
+ ret = vmd_create_irq_domain(vmd);
+ if (ret)
+ return ret;
+
+ /*
+ * Override the IRQ domain bus token so the domain can be
+ * distinguished from a regular PCI/MSI domain.
+ */
+ irq_domain_update_bus_token(vmd->irq_domain, DOMAIN_BUS_VMD_MSI);
+ } else {
+ vmd_set_msi_remapping(vmd, false);
+ }
+
+ pci_add_resource(&resources, &vmd->resources[0]);
+ pci_add_resource_offset(&resources, &vmd->resources[1], offset[0]);
+ pci_add_resource_offset(&resources, &vmd->resources[2], offset[1]);
+
+ vmd->bus = pci_create_root_bus(&vmd->dev->dev, vmd->busn_start,
+ &vmd_ops, sd, &resources);
+ if (!vmd->bus) {
+ pci_free_resource_list(&resources);
+ vmd_remove_irq_domain(vmd);
+ return -ENODEV;
+ }
+
+ vmd_copy_host_bridge_flags(pci_find_host_bridge(vmd->dev->bus),
+ to_pci_host_bridge(vmd->bus->bridge));
+
+ vmd_attach_resources(vmd);
+ if (vmd->irq_domain)
+ dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
+ else
+ dev_set_msi_domain(&vmd->bus->dev,
+ dev_get_msi_domain(&vmd->dev->dev));
+
+ vmd_acpi_begin();
+
+ pci_scan_child_bus(vmd->bus);
+ vmd_domain_reset(vmd);
+
+ /* When Intel VMD is enabled, the OS does not discover the Root Ports
+ * owned by Intel VMD within the MMCFG space. pci_reset_bus() applies
+ * a reset to the parent of the PCI device supplied as argument. This
+ * is why we pass a child device, so the reset can be triggered at
+ * the Intel bridge level and propagated to all the children in the
+ * hierarchy.
+ */
+ list_for_each_entry(child, &vmd->bus->children, node) {
+ if (!list_empty(&child->devices)) {
+ dev = list_first_entry(&child->devices,
+ struct pci_dev, bus_list);
+ ret = pci_reset_bus(dev);
+ if (ret)
+ pci_warn(dev, "can't reset device: %d\n", ret);
+
+ break;
+ }
+ }
+
+ pci_assign_unassigned_bus_resources(vmd->bus);
+
+ pci_walk_bus(vmd->bus, vmd_pm_enable_quirk, &features);
+
+ /*
+ * VMD root buses are virtual and don't return true on pci_is_pcie()
+ * and will fail pcie_bus_configure_settings() early. It can instead be
+ * run on each of the real root ports.
+ */
+ list_for_each_entry(child, &vmd->bus->children, node)
+ pcie_bus_configure_settings(child);
+
+ pci_bus_add_devices(vmd->bus);
+
+ vmd_acpi_end();
+
+ WARN(sysfs_create_link(&vmd->dev->dev.kobj, &vmd->bus->dev.kobj,
+ "domain"), "Can't create symlink to domain\n");
+ return 0;
+}
+
+static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ unsigned long features = (unsigned long) id->driver_data;
+ struct vmd_dev *vmd;
+ int err;
+
+ if (resource_size(&dev->resource[VMD_CFGBAR]) < (1 << 20))
+ return -ENOMEM;
+
+ vmd = devm_kzalloc(&dev->dev, sizeof(*vmd), GFP_KERNEL);
+ if (!vmd)
+ return -ENOMEM;
+
+ vmd->dev = dev;
+ vmd->instance = ida_simple_get(&vmd_instance_ida, 0, 0, GFP_KERNEL);
+ if (vmd->instance < 0)
+ return vmd->instance;
+
+ vmd->name = devm_kasprintf(&dev->dev, GFP_KERNEL, "vmd%d",
+ vmd->instance);
+ if (!vmd->name) {
+ err = -ENOMEM;
+ goto out_release_instance;
+ }
+
+ err = pcim_enable_device(dev);
+ if (err < 0)
+ goto out_release_instance;
+
+ vmd->cfgbar = pcim_iomap(dev, VMD_CFGBAR, 0);
+ if (!vmd->cfgbar) {
+ err = -ENOMEM;
+ goto out_release_instance;
+ }
+
+ pci_set_master(dev);
+ if (dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(64)) &&
+ dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32))) {
+ err = -ENODEV;
+ goto out_release_instance;
+ }
+
+ if (features & VMD_FEAT_OFFSET_FIRST_VECTOR)
+ vmd->first_vec = 1;
+
+ spin_lock_init(&vmd->cfg_lock);
+ pci_set_drvdata(dev, vmd);
+ err = vmd_enable_domain(vmd, features);
+ if (err)
+ goto out_release_instance;
+
+ dev_info(&vmd->dev->dev, "Bound to PCI domain %04x\n",
+ vmd->sysdata.domain);
+ return 0;
+
+ out_release_instance:
+ ida_simple_remove(&vmd_instance_ida, vmd->instance);
+ return err;
+}
+
+static void vmd_cleanup_srcu(struct vmd_dev *vmd)
+{
+ int i;
+
+ for (i = 0; i < vmd->msix_count; i++)
+ cleanup_srcu_struct(&vmd->irqs[i].srcu);
+}
+
+static void vmd_remove(struct pci_dev *dev)
+{
+ struct vmd_dev *vmd = pci_get_drvdata(dev);
+
+ sysfs_remove_link(&vmd->dev->dev.kobj, "domain");
+ pci_stop_root_bus(vmd->bus);
+ pci_remove_root_bus(vmd->bus);
+ vmd_cleanup_srcu(vmd);
+ vmd_detach_resources(vmd);
+ vmd_remove_irq_domain(vmd);
+ ida_simple_remove(&vmd_instance_ida, vmd->instance);
+}
+
+static void vmd_shutdown(struct pci_dev *dev)
+{
+ struct vmd_dev *vmd = pci_get_drvdata(dev);
+
+ vmd_remove_irq_domain(vmd);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int vmd_suspend(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct vmd_dev *vmd = pci_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < vmd->msix_count; i++)
+ devm_free_irq(dev, vmd->irqs[i].virq, &vmd->irqs[i]);
+
+ return 0;
+}
+
+static int vmd_resume(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct vmd_dev *vmd = pci_get_drvdata(pdev);
+ int err, i;
+
+ if (vmd->irq_domain)
+ vmd_set_msi_remapping(vmd, true);
+ else
+ vmd_set_msi_remapping(vmd, false);
+
+ for (i = 0; i < vmd->msix_count; i++) {
+ err = devm_request_irq(dev, vmd->irqs[i].virq,
+ vmd_irq, IRQF_NO_THREAD,
+ vmd->name, &vmd->irqs[i]);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+#endif
+static SIMPLE_DEV_PM_OPS(vmd_dev_pm_ops, vmd_suspend, vmd_resume);
+
+static const struct pci_device_id vmd_ids[] = {
+ {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_VMD_201D),
+ .driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP,},
+ {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_VMD_28C0),
+ .driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW |
+ VMD_FEAT_HAS_BUS_RESTRICTIONS |
+ VMD_FEAT_CAN_BYPASS_MSI_REMAP,},
+ {PCI_VDEVICE(INTEL, 0x467f),
+ .driver_data = VMD_FEATS_CLIENT,},
+ {PCI_VDEVICE(INTEL, 0x4c3d),
+ .driver_data = VMD_FEATS_CLIENT,},
+ {PCI_VDEVICE(INTEL, 0xa77f),
+ .driver_data = VMD_FEATS_CLIENT,},
+ {PCI_VDEVICE(INTEL, 0x7d0b),
+ .driver_data = VMD_FEATS_CLIENT,},
+ {PCI_VDEVICE(INTEL, 0xad0b),
+ .driver_data = VMD_FEATS_CLIENT,},
+ {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_VMD_9A0B),
+ .driver_data = VMD_FEATS_CLIENT,},
+ {0,}
+};
+MODULE_DEVICE_TABLE(pci, vmd_ids);
+
+static struct pci_driver vmd_drv = {
+ .name = "vmd",
+ .id_table = vmd_ids,
+ .probe = vmd_probe,
+ .remove = vmd_remove,
+ .shutdown = vmd_shutdown,
+ .driver = {
+ .pm = &vmd_dev_pm_ops,
+ },
+};
+module_pci_driver(vmd_drv);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION("0.6");