x86/PCI: VMD: Move VMD driver to drivers/pci/host
authorKeith Busch <keith.busch@intel.com>
Tue, 4 Oct 2016 17:26:37 +0000 (12:26 -0500)
committerBjorn Helgaas <bhelgaas@google.com>
Tue, 4 Oct 2016 17:26:37 +0000 (12:26 -0500)
Move the driver source and Kconfig to the PCI host bridge drivers directory
and move the config option to a more appropriate sub-menu instead of
occupying the top-level location.

Update the Kconfig option with the X86_64 dependency that was implicitly
included from the previous location, and add information about the module
name when built as a loadable module.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Jon Derrick <jonathan.derrick@intel.com>
arch/x86/Kconfig
arch/x86/pci/Makefile
arch/x86/pci/vmd.c [deleted file]
drivers/pci/host/Kconfig
drivers/pci/host/Makefile
drivers/pci/host/vmd.c [new file with mode: 0644]

index 5c6e7471b732335bf0b4272a4f274520d2bb4f4e..c32083808f277bfe3df683a6d7992c2731c4d115 100644 (file)
@@ -2744,19 +2744,6 @@ config PMC_ATOM
        def_bool y
         depends on PCI
 
-config VMD
-       depends on PCI_MSI
-       tristate "Volume Management Device Driver"
-       default N
-       ---help---
-         Adds support for the Intel Volume Management Device (VMD). VMD is a
-         secondary PCI host bridge that allows PCI Express root ports,
-         and devices attached to them, to be removed from the default
-         PCI domain and placed within the VMD domain. This provides
-         more bus resources than are otherwise possible with a
-         single domain. If you know your system provides one of these and
-         has devices attached to it, say Y; if you are not sure, say N.
-
 source "net/Kconfig"
 
 source "drivers/Kconfig"
index 97062a635b7715d1c5d55014d70d5ddbf77b25a0..5c6fc3577a49f80a75c86cd3815a6c5758ba1288 100644 (file)
@@ -23,8 +23,6 @@ obj-y                         += bus_numa.o
 obj-$(CONFIG_AMD_NB)           += amd_bus.o
 obj-$(CONFIG_PCI_CNB20LE_QUIRK)        += broadcom_bus.o
 
-obj-$(CONFIG_VMD) += vmd.o
-
 ifeq ($(CONFIG_PCI_DEBUG),y)
 EXTRA_CFLAGS += -DDEBUG
 endif
diff --git a/arch/x86/pci/vmd.c b/arch/x86/pci/vmd.c
deleted file mode 100644 (file)
index 5705852..0000000
+++ /dev/null
@@ -1,761 +0,0 @@
-/*
- * Volume Management Device driver
- * Copyright (c) 2015, Intel Corporation.
- *
- * 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 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.
- */
-
-#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/rculist.h>
-#include <linux/rcupdate.h>
-
-#include <asm/irqdomain.h>
-#include <asm/device.h>
-#include <asm/msi.h>
-#include <asm/msidef.h>
-
-#define VMD_CFGBAR     0
-#define VMD_MEMBAR1    2
-#define VMD_MEMBAR2    4
-
-/*
- * 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.
- * @rcu:       RCU callback item for freeing.
- * @irq:       back pointer to parent.
- * @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 rcu_head         rcu;
-       struct vmd_irq_list     *irq;
-       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.
- * @count:     number of child IRQs assigned to this vector; used to track
- *             sharing.
- */
-struct vmd_irq_list {
-       struct list_head        irq_list;
-       unsigned int            count;
-};
-
-struct vmd_dev {
-       struct pci_dev          *dev;
-
-       spinlock_t              cfg_lock;
-       char __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;
-
-#ifdef CONFIG_X86_DEV_DMA_OPS
-       struct dma_map_ops      dma_ops;
-       struct dma_domain       dma_domain;
-#endif
-};
-
-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);
-
-       msg->address_hi = MSI_ADDR_BASE_HI;
-       msg->address_lo = MSI_ADDR_BASE_LO |
-                         MSI_ADDR_DEST_ID(index_from_irqs(vmd, irq));
-       msg->data = 0;
-}
-
-/*
- * 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);
-       list_add_tail_rcu(&vmdirq->node, &vmdirq->irq->irq_list);
-       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);
-       list_del_rcu(&vmdirq->node);
-       INIT_LIST_HEAD_RCU(&vmdirq->node);
-       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)
-{
-       int i, best = 1;
-       unsigned long flags;
-
-       if (!desc->msi_attrib.is_msix || vmd->msix_count == 1)
-               return &vmd->irqs[0];
-
-       raw_spin_lock_irqsave(&list_lock, flags);
-       for (i = 1; 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);
-       unsigned int index, vector;
-
-       if (!vmdirq)
-               return -ENOMEM;
-
-       INIT_LIST_HEAD(&vmdirq->node);
-       vmdirq->irq = vmd_next_irq(vmd, desc);
-       vmdirq->virq = virq;
-       index = index_from_irqs(vmd, vmdirq->irq);
-       vector = pci_irq_vector(vmd->dev, index);
-
-       irq_domain_set_info(domain, virq, vector, 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_rcu();
-
-       /* XXX: Potential optimization to rebalance */
-       raw_spin_lock_irqsave(&list_lock, flags);
-       vmdirq->irq->count--;
-       raw_spin_unlock_irqrestore(&list_lock, flags);
-
-       kfree_rcu(vmdirq, rcu);
-}
-
-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,
-};
-
-#ifdef CONFIG_X86_DEV_DMA_OPS
-/*
- * VMD replaces the requester ID with its own.  DMA mappings for devices in a
- * VMD domain need to be mapped for the VMD, not the device requiring
- * the mapping.
- */
-static struct device *to_vmd_dev(struct device *dev)
-{
-       struct pci_dev *pdev = to_pci_dev(dev);
-       struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
-
-       return &vmd->dev->dev;
-}
-
-static struct dma_map_ops *vmd_dma_ops(struct device *dev)
-{
-       return get_dma_ops(to_vmd_dev(dev));
-}
-
-static void *vmd_alloc(struct device *dev, size_t size, dma_addr_t *addr,
-                      gfp_t flag, unsigned long attrs)
-{
-       return vmd_dma_ops(dev)->alloc(to_vmd_dev(dev), size, addr, flag,
-                                      attrs);
-}
-
-static void vmd_free(struct device *dev, size_t size, void *vaddr,
-                    dma_addr_t addr, unsigned long attrs)
-{
-       return vmd_dma_ops(dev)->free(to_vmd_dev(dev), size, vaddr, addr,
-                                     attrs);
-}
-
-static int vmd_mmap(struct device *dev, struct vm_area_struct *vma,
-                   void *cpu_addr, dma_addr_t addr, size_t size,
-                   unsigned long attrs)
-{
-       return vmd_dma_ops(dev)->mmap(to_vmd_dev(dev), vma, cpu_addr, addr,
-                                     size, attrs);
-}
-
-static int vmd_get_sgtable(struct device *dev, struct sg_table *sgt,
-                          void *cpu_addr, dma_addr_t addr, size_t size,
-                          unsigned long attrs)
-{
-       return vmd_dma_ops(dev)->get_sgtable(to_vmd_dev(dev), sgt, cpu_addr,
-                                            addr, size, attrs);
-}
-
-static dma_addr_t vmd_map_page(struct device *dev, struct page *page,
-                              unsigned long offset, size_t size,
-                              enum dma_data_direction dir,
-                              unsigned long attrs)
-{
-       return vmd_dma_ops(dev)->map_page(to_vmd_dev(dev), page, offset, size,
-                                         dir, attrs);
-}
-
-static void vmd_unmap_page(struct device *dev, dma_addr_t addr, size_t size,
-                          enum dma_data_direction dir, unsigned long attrs)
-{
-       vmd_dma_ops(dev)->unmap_page(to_vmd_dev(dev), addr, size, dir, attrs);
-}
-
-static int vmd_map_sg(struct device *dev, struct scatterlist *sg, int nents,
-                     enum dma_data_direction dir, unsigned long attrs)
-{
-       return vmd_dma_ops(dev)->map_sg(to_vmd_dev(dev), sg, nents, dir, attrs);
-}
-
-static void vmd_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
-                        enum dma_data_direction dir, unsigned long attrs)
-{
-       vmd_dma_ops(dev)->unmap_sg(to_vmd_dev(dev), sg, nents, dir, attrs);
-}
-
-static void vmd_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
-                                   size_t size, enum dma_data_direction dir)
-{
-       vmd_dma_ops(dev)->sync_single_for_cpu(to_vmd_dev(dev), addr, size, dir);
-}
-
-static void vmd_sync_single_for_device(struct device *dev, dma_addr_t addr,
-                                      size_t size, enum dma_data_direction dir)
-{
-       vmd_dma_ops(dev)->sync_single_for_device(to_vmd_dev(dev), addr, size,
-                                                dir);
-}
-
-static void vmd_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
-                               int nents, enum dma_data_direction dir)
-{
-       vmd_dma_ops(dev)->sync_sg_for_cpu(to_vmd_dev(dev), sg, nents, dir);
-}
-
-static void vmd_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
-                                  int nents, enum dma_data_direction dir)
-{
-       vmd_dma_ops(dev)->sync_sg_for_device(to_vmd_dev(dev), sg, nents, dir);
-}
-
-static int vmd_mapping_error(struct device *dev, dma_addr_t addr)
-{
-       return vmd_dma_ops(dev)->mapping_error(to_vmd_dev(dev), addr);
-}
-
-static int vmd_dma_supported(struct device *dev, u64 mask)
-{
-       return vmd_dma_ops(dev)->dma_supported(to_vmd_dev(dev), mask);
-}
-
-#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
-static u64 vmd_get_required_mask(struct device *dev)
-{
-       return vmd_dma_ops(dev)->get_required_mask(to_vmd_dev(dev));
-}
-#endif
-
-static void vmd_teardown_dma_ops(struct vmd_dev *vmd)
-{
-       struct dma_domain *domain = &vmd->dma_domain;
-
-       if (get_dma_ops(&vmd->dev->dev))
-               del_dma_domain(domain);
-}
-
-#define ASSIGN_VMD_DMA_OPS(source, dest, fn)   \
-       do {                                    \
-               if (source->fn)                 \
-                       dest->fn = vmd_##fn;    \
-       } while (0)
-
-static void vmd_setup_dma_ops(struct vmd_dev *vmd)
-{
-       const struct dma_map_ops *source = get_dma_ops(&vmd->dev->dev);
-       struct dma_map_ops *dest = &vmd->dma_ops;
-       struct dma_domain *domain = &vmd->dma_domain;
-
-       domain->domain_nr = vmd->sysdata.domain;
-       domain->dma_ops = dest;
-
-       if (!source)
-               return;
-       ASSIGN_VMD_DMA_OPS(source, dest, alloc);
-       ASSIGN_VMD_DMA_OPS(source, dest, free);
-       ASSIGN_VMD_DMA_OPS(source, dest, mmap);
-       ASSIGN_VMD_DMA_OPS(source, dest, get_sgtable);
-       ASSIGN_VMD_DMA_OPS(source, dest, map_page);
-       ASSIGN_VMD_DMA_OPS(source, dest, unmap_page);
-       ASSIGN_VMD_DMA_OPS(source, dest, map_sg);
-       ASSIGN_VMD_DMA_OPS(source, dest, unmap_sg);
-       ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_cpu);
-       ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_device);
-       ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_cpu);
-       ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_device);
-       ASSIGN_VMD_DMA_OPS(source, dest, mapping_error);
-       ASSIGN_VMD_DMA_OPS(source, dest, dma_supported);
-#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
-       ASSIGN_VMD_DMA_OPS(source, dest, get_required_mask);
-#endif
-       add_dma_domain(domain);
-}
-#undef ASSIGN_VMD_DMA_OPS
-#else
-static void vmd_teardown_dma_ops(struct vmd_dev *vmd) {}
-static void vmd_setup_dma_ops(struct vmd_dev *vmd) {}
-#endif
-
-static char __iomem *vmd_cfg_addr(struct vmd_dev *vmd, struct pci_bus *bus,
-                                 unsigned int devfn, int reg, int len)
-{
-       char __iomem *addr = vmd->cfgbar +
-                            (bus->number << 20) + (devfn << 12) + reg;
-
-       if ((addr - vmd->cfgbar) + len >=
-           resource_size(&vmd->dev->resource[VMD_CFGBAR]))
-               return NULL;
-
-       return addr;
-}
-
-/*
- * 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);
-       char __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);
-       char __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,
-};
-
-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 0x1000 to not clash with ACPI _SEG domains.
- */
-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_enable_domain(struct vmd_dev *vmd)
-{
-       struct pci_sysdata *sd = &vmd->sysdata;
-       struct resource *res;
-       u32 upper_bits;
-       unsigned long flags;
-       LIST_HEAD(resources);
-
-       res = &vmd->dev->resource[VMD_CFGBAR];
-       vmd->resources[0] = (struct resource) {
-               .name  = "VMD CFGBAR",
-               .start = 0,
-               .end   = (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-prefechable 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 + 0x2000,
-               .end   = res->end,
-               .flags = flags,
-               .parent = res,
-       };
-
-       sd->domain = vmd_find_free_domain();
-       if (sd->domain < 0)
-               return sd->domain;
-
-       sd->node = pcibus_to_node(vmd->dev->bus);
-
-       vmd->irq_domain = pci_msi_create_irq_domain(NULL, &vmd_msi_domain_info,
-                                                   x86_vector_domain);
-       if (!vmd->irq_domain)
-               return -ENODEV;
-
-       pci_add_resource(&resources, &vmd->resources[0]);
-       pci_add_resource(&resources, &vmd->resources[1]);
-       pci_add_resource(&resources, &vmd->resources[2]);
-       vmd->bus = pci_create_root_bus(&vmd->dev->dev, 0, &vmd_ops, sd,
-                                      &resources);
-       if (!vmd->bus) {
-               pci_free_resource_list(&resources);
-               irq_domain_remove(vmd->irq_domain);
-               return -ENODEV;
-       }
-
-       vmd_attach_resources(vmd);
-       vmd_setup_dma_ops(vmd);
-       dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
-       pci_rescan_bus(vmd->bus);
-
-       WARN(sysfs_create_link(&vmd->dev->dev.kobj, &vmd->bus->dev.kobj,
-                              "domain"), "Can't create symlink to domain\n");
-       return 0;
-}
-
-static irqreturn_t vmd_irq(int irq, void *data)
-{
-       struct vmd_irq_list *irqs = data;
-       struct vmd_irq *vmdirq;
-
-       rcu_read_lock();
-       list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node)
-               generic_handle_irq(vmdirq->virq);
-       rcu_read_unlock();
-
-       return IRQ_HANDLED;
-}
-
-static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
-{
-       struct vmd_dev *vmd;
-       int i, 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;
-       err = pcim_enable_device(dev);
-       if (err < 0)
-               return err;
-
-       vmd->cfgbar = pcim_iomap(dev, VMD_CFGBAR, 0);
-       if (!vmd->cfgbar)
-               return -ENOMEM;
-
-       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)))
-               return -ENODEV;
-
-       vmd->msix_count = pci_msix_vec_count(dev);
-       if (vmd->msix_count < 0)
-               return -ENODEV;
-
-       vmd->msix_count = pci_alloc_irq_vectors(dev, 1, vmd->msix_count,
-                                       PCI_IRQ_MSIX | PCI_IRQ_AFFINITY);
-       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++) {
-               INIT_LIST_HEAD(&vmd->irqs[i].irq_list);
-               err = devm_request_irq(&dev->dev, pci_irq_vector(dev, i),
-                                      vmd_irq, 0, "vmd", &vmd->irqs[i]);
-               if (err)
-                       return err;
-       }
-
-       spin_lock_init(&vmd->cfg_lock);
-       pci_set_drvdata(dev, vmd);
-       err = vmd_enable_domain(vmd);
-       if (err)
-               return err;
-
-       dev_info(&vmd->dev->dev, "Bound to PCI domain %04x\n",
-                vmd->sysdata.domain);
-       return 0;
-}
-
-static void vmd_remove(struct pci_dev *dev)
-{
-       struct vmd_dev *vmd = pci_get_drvdata(dev);
-
-       vmd_detach_resources(vmd);
-       pci_set_drvdata(dev, NULL);
-       sysfs_remove_link(&vmd->dev->dev.kobj, "domain");
-       pci_stop_root_bus(vmd->bus);
-       pci_remove_root_bus(vmd->bus);
-       vmd_teardown_dma_ops(vmd);
-       irq_domain_remove(vmd->irq_domain);
-}
-
-#ifdef CONFIG_PM
-static int vmd_suspend(struct device *dev)
-{
-       struct pci_dev *pdev = to_pci_dev(dev);
-
-       pci_save_state(pdev);
-       return 0;
-}
-
-static int vmd_resume(struct device *dev)
-{
-       struct pci_dev *pdev = to_pci_dev(dev);
-
-       pci_restore_state(pdev);
-       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_DEVICE(PCI_VENDOR_ID_INTEL, 0x201d),},
-       {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,
-       .driver         = {
-               .pm     = &vmd_dev_pm_ops,
-       },
-};
-module_pci_driver(vmd_drv);
-
-MODULE_AUTHOR("Intel Corporation");
-MODULE_LICENSE("GPL v2");
-MODULE_VERSION("0.6");
index 9b485d873b0d336a1fb70a5aae1e3c96e4f26f01..93865eb2c4c85f8e1ef26b633ac1ca0ca75128a0 100644 (file)
@@ -274,4 +274,20 @@ config PCIE_ARTPEC6
          Say Y here to enable PCIe controller support on Axis ARTPEC-6
          SoCs.  This PCIe controller uses the DesignWare core.
 
+config VMD
+       depends on PCI_MSI && X86_64
+       tristate "Intel Volume Management Device Driver"
+       default N
+       ---help---
+         Adds support for the Intel Volume Management Device (VMD). VMD is a
+         secondary PCI host bridge that allows PCI Express root ports,
+         and devices attached to them, to be removed from the default
+         PCI domain and placed within the VMD domain. This provides
+         more bus resources than are otherwise possible with a
+         single domain. If you know your system provides one of these and
+         has devices attached to it, say Y; if you are not sure, say N.
+
+         To compile this driver as a module, choose M here: the
+         module will be called vmd.
+
 endmenu
index 88434101e4c40075fc1e3d36ab29faf12ce30e32..afea1c61e45a7621b572a2414572f02bc029b508 100644 (file)
@@ -31,3 +31,4 @@ obj-$(CONFIG_PCI_HOST_THUNDER_ECAM) += pci-thunder-ecam.o
 obj-$(CONFIG_PCI_HOST_THUNDER_PEM) += pci-thunder-pem.o
 obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
 obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o
+obj-$(CONFIG_VMD) += vmd.o
diff --git a/drivers/pci/host/vmd.c b/drivers/pci/host/vmd.c
new file mode 100644 (file)
index 0000000..5705852
--- /dev/null
@@ -0,0 +1,761 @@
+/*
+ * Volume Management Device driver
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * 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 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.
+ */
+
+#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/rculist.h>
+#include <linux/rcupdate.h>
+
+#include <asm/irqdomain.h>
+#include <asm/device.h>
+#include <asm/msi.h>
+#include <asm/msidef.h>
+
+#define VMD_CFGBAR     0
+#define VMD_MEMBAR1    2
+#define VMD_MEMBAR2    4
+
+/*
+ * 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.
+ * @rcu:       RCU callback item for freeing.
+ * @irq:       back pointer to parent.
+ * @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 rcu_head         rcu;
+       struct vmd_irq_list     *irq;
+       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.
+ * @count:     number of child IRQs assigned to this vector; used to track
+ *             sharing.
+ */
+struct vmd_irq_list {
+       struct list_head        irq_list;
+       unsigned int            count;
+};
+
+struct vmd_dev {
+       struct pci_dev          *dev;
+
+       spinlock_t              cfg_lock;
+       char __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;
+
+#ifdef CONFIG_X86_DEV_DMA_OPS
+       struct dma_map_ops      dma_ops;
+       struct dma_domain       dma_domain;
+#endif
+};
+
+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);
+
+       msg->address_hi = MSI_ADDR_BASE_HI;
+       msg->address_lo = MSI_ADDR_BASE_LO |
+                         MSI_ADDR_DEST_ID(index_from_irqs(vmd, irq));
+       msg->data = 0;
+}
+
+/*
+ * 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);
+       list_add_tail_rcu(&vmdirq->node, &vmdirq->irq->irq_list);
+       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);
+       list_del_rcu(&vmdirq->node);
+       INIT_LIST_HEAD_RCU(&vmdirq->node);
+       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)
+{
+       int i, best = 1;
+       unsigned long flags;
+
+       if (!desc->msi_attrib.is_msix || vmd->msix_count == 1)
+               return &vmd->irqs[0];
+
+       raw_spin_lock_irqsave(&list_lock, flags);
+       for (i = 1; 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);
+       unsigned int index, vector;
+
+       if (!vmdirq)
+               return -ENOMEM;
+
+       INIT_LIST_HEAD(&vmdirq->node);
+       vmdirq->irq = vmd_next_irq(vmd, desc);
+       vmdirq->virq = virq;
+       index = index_from_irqs(vmd, vmdirq->irq);
+       vector = pci_irq_vector(vmd->dev, index);
+
+       irq_domain_set_info(domain, virq, vector, 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_rcu();
+
+       /* XXX: Potential optimization to rebalance */
+       raw_spin_lock_irqsave(&list_lock, flags);
+       vmdirq->irq->count--;
+       raw_spin_unlock_irqrestore(&list_lock, flags);
+
+       kfree_rcu(vmdirq, rcu);
+}
+
+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,
+};
+
+#ifdef CONFIG_X86_DEV_DMA_OPS
+/*
+ * VMD replaces the requester ID with its own.  DMA mappings for devices in a
+ * VMD domain need to be mapped for the VMD, not the device requiring
+ * the mapping.
+ */
+static struct device *to_vmd_dev(struct device *dev)
+{
+       struct pci_dev *pdev = to_pci_dev(dev);
+       struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
+
+       return &vmd->dev->dev;
+}
+
+static struct dma_map_ops *vmd_dma_ops(struct device *dev)
+{
+       return get_dma_ops(to_vmd_dev(dev));
+}
+
+static void *vmd_alloc(struct device *dev, size_t size, dma_addr_t *addr,
+                      gfp_t flag, unsigned long attrs)
+{
+       return vmd_dma_ops(dev)->alloc(to_vmd_dev(dev), size, addr, flag,
+                                      attrs);
+}
+
+static void vmd_free(struct device *dev, size_t size, void *vaddr,
+                    dma_addr_t addr, unsigned long attrs)
+{
+       return vmd_dma_ops(dev)->free(to_vmd_dev(dev), size, vaddr, addr,
+                                     attrs);
+}
+
+static int vmd_mmap(struct device *dev, struct vm_area_struct *vma,
+                   void *cpu_addr, dma_addr_t addr, size_t size,
+                   unsigned long attrs)
+{
+       return vmd_dma_ops(dev)->mmap(to_vmd_dev(dev), vma, cpu_addr, addr,
+                                     size, attrs);
+}
+
+static int vmd_get_sgtable(struct device *dev, struct sg_table *sgt,
+                          void *cpu_addr, dma_addr_t addr, size_t size,
+                          unsigned long attrs)
+{
+       return vmd_dma_ops(dev)->get_sgtable(to_vmd_dev(dev), sgt, cpu_addr,
+                                            addr, size, attrs);
+}
+
+static dma_addr_t vmd_map_page(struct device *dev, struct page *page,
+                              unsigned long offset, size_t size,
+                              enum dma_data_direction dir,
+                              unsigned long attrs)
+{
+       return vmd_dma_ops(dev)->map_page(to_vmd_dev(dev), page, offset, size,
+                                         dir, attrs);
+}
+
+static void vmd_unmap_page(struct device *dev, dma_addr_t addr, size_t size,
+                          enum dma_data_direction dir, unsigned long attrs)
+{
+       vmd_dma_ops(dev)->unmap_page(to_vmd_dev(dev), addr, size, dir, attrs);
+}
+
+static int vmd_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+                     enum dma_data_direction dir, unsigned long attrs)
+{
+       return vmd_dma_ops(dev)->map_sg(to_vmd_dev(dev), sg, nents, dir, attrs);
+}
+
+static void vmd_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
+                        enum dma_data_direction dir, unsigned long attrs)
+{
+       vmd_dma_ops(dev)->unmap_sg(to_vmd_dev(dev), sg, nents, dir, attrs);
+}
+
+static void vmd_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
+                                   size_t size, enum dma_data_direction dir)
+{
+       vmd_dma_ops(dev)->sync_single_for_cpu(to_vmd_dev(dev), addr, size, dir);
+}
+
+static void vmd_sync_single_for_device(struct device *dev, dma_addr_t addr,
+                                      size_t size, enum dma_data_direction dir)
+{
+       vmd_dma_ops(dev)->sync_single_for_device(to_vmd_dev(dev), addr, size,
+                                                dir);
+}
+
+static void vmd_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
+                               int nents, enum dma_data_direction dir)
+{
+       vmd_dma_ops(dev)->sync_sg_for_cpu(to_vmd_dev(dev), sg, nents, dir);
+}
+
+static void vmd_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
+                                  int nents, enum dma_data_direction dir)
+{
+       vmd_dma_ops(dev)->sync_sg_for_device(to_vmd_dev(dev), sg, nents, dir);
+}
+
+static int vmd_mapping_error(struct device *dev, dma_addr_t addr)
+{
+       return vmd_dma_ops(dev)->mapping_error(to_vmd_dev(dev), addr);
+}
+
+static int vmd_dma_supported(struct device *dev, u64 mask)
+{
+       return vmd_dma_ops(dev)->dma_supported(to_vmd_dev(dev), mask);
+}
+
+#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
+static u64 vmd_get_required_mask(struct device *dev)
+{
+       return vmd_dma_ops(dev)->get_required_mask(to_vmd_dev(dev));
+}
+#endif
+
+static void vmd_teardown_dma_ops(struct vmd_dev *vmd)
+{
+       struct dma_domain *domain = &vmd->dma_domain;
+
+       if (get_dma_ops(&vmd->dev->dev))
+               del_dma_domain(domain);
+}
+
+#define ASSIGN_VMD_DMA_OPS(source, dest, fn)   \
+       do {                                    \
+               if (source->fn)                 \
+                       dest->fn = vmd_##fn;    \
+       } while (0)
+
+static void vmd_setup_dma_ops(struct vmd_dev *vmd)
+{
+       const struct dma_map_ops *source = get_dma_ops(&vmd->dev->dev);
+       struct dma_map_ops *dest = &vmd->dma_ops;
+       struct dma_domain *domain = &vmd->dma_domain;
+
+       domain->domain_nr = vmd->sysdata.domain;
+       domain->dma_ops = dest;
+
+       if (!source)
+               return;
+       ASSIGN_VMD_DMA_OPS(source, dest, alloc);
+       ASSIGN_VMD_DMA_OPS(source, dest, free);
+       ASSIGN_VMD_DMA_OPS(source, dest, mmap);
+       ASSIGN_VMD_DMA_OPS(source, dest, get_sgtable);
+       ASSIGN_VMD_DMA_OPS(source, dest, map_page);
+       ASSIGN_VMD_DMA_OPS(source, dest, unmap_page);
+       ASSIGN_VMD_DMA_OPS(source, dest, map_sg);
+       ASSIGN_VMD_DMA_OPS(source, dest, unmap_sg);
+       ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_cpu);
+       ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_device);
+       ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_cpu);
+       ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_device);
+       ASSIGN_VMD_DMA_OPS(source, dest, mapping_error);
+       ASSIGN_VMD_DMA_OPS(source, dest, dma_supported);
+#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
+       ASSIGN_VMD_DMA_OPS(source, dest, get_required_mask);
+#endif
+       add_dma_domain(domain);
+}
+#undef ASSIGN_VMD_DMA_OPS
+#else
+static void vmd_teardown_dma_ops(struct vmd_dev *vmd) {}
+static void vmd_setup_dma_ops(struct vmd_dev *vmd) {}
+#endif
+
+static char __iomem *vmd_cfg_addr(struct vmd_dev *vmd, struct pci_bus *bus,
+                                 unsigned int devfn, int reg, int len)
+{
+       char __iomem *addr = vmd->cfgbar +
+                            (bus->number << 20) + (devfn << 12) + reg;
+
+       if ((addr - vmd->cfgbar) + len >=
+           resource_size(&vmd->dev->resource[VMD_CFGBAR]))
+               return NULL;
+
+       return addr;
+}
+
+/*
+ * 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);
+       char __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);
+       char __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,
+};
+
+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 0x1000 to not clash with ACPI _SEG domains.
+ */
+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_enable_domain(struct vmd_dev *vmd)
+{
+       struct pci_sysdata *sd = &vmd->sysdata;
+       struct resource *res;
+       u32 upper_bits;
+       unsigned long flags;
+       LIST_HEAD(resources);
+
+       res = &vmd->dev->resource[VMD_CFGBAR];
+       vmd->resources[0] = (struct resource) {
+               .name  = "VMD CFGBAR",
+               .start = 0,
+               .end   = (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-prefechable 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 + 0x2000,
+               .end   = res->end,
+               .flags = flags,
+               .parent = res,
+       };
+
+       sd->domain = vmd_find_free_domain();
+       if (sd->domain < 0)
+               return sd->domain;
+
+       sd->node = pcibus_to_node(vmd->dev->bus);
+
+       vmd->irq_domain = pci_msi_create_irq_domain(NULL, &vmd_msi_domain_info,
+                                                   x86_vector_domain);
+       if (!vmd->irq_domain)
+               return -ENODEV;
+
+       pci_add_resource(&resources, &vmd->resources[0]);
+       pci_add_resource(&resources, &vmd->resources[1]);
+       pci_add_resource(&resources, &vmd->resources[2]);
+       vmd->bus = pci_create_root_bus(&vmd->dev->dev, 0, &vmd_ops, sd,
+                                      &resources);
+       if (!vmd->bus) {
+               pci_free_resource_list(&resources);
+               irq_domain_remove(vmd->irq_domain);
+               return -ENODEV;
+       }
+
+       vmd_attach_resources(vmd);
+       vmd_setup_dma_ops(vmd);
+       dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
+       pci_rescan_bus(vmd->bus);
+
+       WARN(sysfs_create_link(&vmd->dev->dev.kobj, &vmd->bus->dev.kobj,
+                              "domain"), "Can't create symlink to domain\n");
+       return 0;
+}
+
+static irqreturn_t vmd_irq(int irq, void *data)
+{
+       struct vmd_irq_list *irqs = data;
+       struct vmd_irq *vmdirq;
+
+       rcu_read_lock();
+       list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node)
+               generic_handle_irq(vmdirq->virq);
+       rcu_read_unlock();
+
+       return IRQ_HANDLED;
+}
+
+static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+       struct vmd_dev *vmd;
+       int i, 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;
+       err = pcim_enable_device(dev);
+       if (err < 0)
+               return err;
+
+       vmd->cfgbar = pcim_iomap(dev, VMD_CFGBAR, 0);
+       if (!vmd->cfgbar)
+               return -ENOMEM;
+
+       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)))
+               return -ENODEV;
+
+       vmd->msix_count = pci_msix_vec_count(dev);
+       if (vmd->msix_count < 0)
+               return -ENODEV;
+
+       vmd->msix_count = pci_alloc_irq_vectors(dev, 1, vmd->msix_count,
+                                       PCI_IRQ_MSIX | PCI_IRQ_AFFINITY);
+       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++) {
+               INIT_LIST_HEAD(&vmd->irqs[i].irq_list);
+               err = devm_request_irq(&dev->dev, pci_irq_vector(dev, i),
+                                      vmd_irq, 0, "vmd", &vmd->irqs[i]);
+               if (err)
+                       return err;
+       }
+
+       spin_lock_init(&vmd->cfg_lock);
+       pci_set_drvdata(dev, vmd);
+       err = vmd_enable_domain(vmd);
+       if (err)
+               return err;
+
+       dev_info(&vmd->dev->dev, "Bound to PCI domain %04x\n",
+                vmd->sysdata.domain);
+       return 0;
+}
+
+static void vmd_remove(struct pci_dev *dev)
+{
+       struct vmd_dev *vmd = pci_get_drvdata(dev);
+
+       vmd_detach_resources(vmd);
+       pci_set_drvdata(dev, NULL);
+       sysfs_remove_link(&vmd->dev->dev.kobj, "domain");
+       pci_stop_root_bus(vmd->bus);
+       pci_remove_root_bus(vmd->bus);
+       vmd_teardown_dma_ops(vmd);
+       irq_domain_remove(vmd->irq_domain);
+}
+
+#ifdef CONFIG_PM
+static int vmd_suspend(struct device *dev)
+{
+       struct pci_dev *pdev = to_pci_dev(dev);
+
+       pci_save_state(pdev);
+       return 0;
+}
+
+static int vmd_resume(struct device *dev)
+{
+       struct pci_dev *pdev = to_pci_dev(dev);
+
+       pci_restore_state(pdev);
+       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_DEVICE(PCI_VENDOR_ID_INTEL, 0x201d),},
+       {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,
+       .driver         = {
+               .pm     = &vmd_dev_pm_ops,
+       },
+};
+module_pci_driver(vmd_drv);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION("0.6");