linux/drivers/pci/controller/vmd.c
Linus Torvalds bd6bf7c104 pci-v4.20-changes
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Merge tag 'pci-v4.20-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI updates from Bjorn Helgaas:

 - Fix ASPM link_state teardown on removal (Lukas Wunner)

 - Fix misleading _OSC ASPM message (Sinan Kaya)

 - Make _OSC optional for PCI (Sinan Kaya)

 - Don't initialize ASPM link state when ACPI_FADT_NO_ASPM is set
   (Patrick Talbert)

 - Remove x86 and arm64 node-local allocation for host bridge structures
   (Punit Agrawal)

 - Pay attention to device-specific _PXM node values (Jonathan Cameron)

 - Support new Immediate Readiness bit (Felipe Balbi)

 - Differentiate between pciehp surprise and safe removal (Lukas Wunner)

 - Remove unnecessary pciehp includes (Lukas Wunner)

 - Drop pciehp hotplug_slot_ops wrappers (Lukas Wunner)

 - Tolerate PCIe Slot Presence Detect being hardwired to zero to
   workaround broken hardware, e.g., the Wilocity switch/wireless device
   (Lukas Wunner)

 - Unify pciehp controller & slot structs (Lukas Wunner)

 - Constify hotplug_slot_ops (Lukas Wunner)

 - Drop hotplug_slot_info (Lukas Wunner)

 - Embed hotplug_slot struct into users instead of allocating it
   separately (Lukas Wunner)

 - Initialize PCIe port service drivers directly instead of relying on
   initcall ordering (Keith Busch)

 - Restore PCI config state after a slot reset (Keith Busch)

 - Save/restore DPC config state along with other PCI config state
   (Keith Busch)

 - Reference count devices during AER handling to avoid race issue with
   concurrent hot removal (Keith Busch)

 - If an Upstream Port reports ERR_FATAL, don't try to read the Port's
   config space because it is probably unreachable (Keith Busch)

 - During error handling, use slot-specific reset instead of secondary
   bus reset to avoid link up/down issues on hotplug ports (Keith Busch)

 - Restore previous AER/DPC handling that does not remove and
   re-enumerate devices on ERR_FATAL (Keith Busch)

 - Notify all drivers that may be affected by error recovery resets
   (Keith Busch)

 - Always generate error recovery uevents, even if a driver doesn't have
   error callbacks (Keith Busch)

 - Make PCIe link active reporting detection generic (Keith Busch)

 - Support D3cold in PCIe hierarchies during system sleep and runtime,
   including hotplug and Thunderbolt ports (Mika Westerberg)

 - Handle hpmemsize/hpiosize kernel parameters uniformly, whether slots
   are empty or occupied (Jon Derrick)

 - Remove duplicated include from pci/pcie/err.c and unused variable
   from cpqphp (YueHaibing)

 - Remove driver pci_cleanup_aer_uncorrect_error_status() calls (Oza
   Pawandeep)

 - Uninline PCI bus accessors for better ftracing (Keith Busch)

 - Remove unused AER Root Port .error_resume method (Keith Busch)

 - Use kfifo in AER instead of a local version (Keith Busch)

 - Use threaded IRQ in AER bottom half (Keith Busch)

 - Use managed resources in AER core (Keith Busch)

 - Reuse pcie_port_find_device() for AER injection (Keith Busch)

 - Abstract AER interrupt handling to disconnect error injection (Keith
   Busch)

 - Refactor AER injection callbacks to simplify future improvments
   (Keith Busch)

 - Remove unused Netronome NFP32xx Device IDs (Jakub Kicinski)

 - Use bitmap_zalloc() for dma_alias_mask (Andy Shevchenko)

 - Add switch fall-through annotations (Gustavo A. R. Silva)

 - Remove unused Switchtec quirk variable (Joshua Abraham)

 - Fix pci.c kernel-doc warning (Randy Dunlap)

 - Remove trivial PCI wrappers for DMA APIs (Christoph Hellwig)

 - Add Intel GPU device IDs to spurious interrupt quirk (Bin Meng)

 - Run Switchtec DMA aliasing quirk only on NTB endpoints to avoid
   useless dmesg errors (Logan Gunthorpe)

 - Update Switchtec NTB documentation (Wesley Yung)

 - Remove redundant "default n" from Kconfig (Bartlomiej Zolnierkiewicz)

 - Avoid panic when drivers enable MSI/MSI-X twice (Tonghao Zhang)

 - Add PCI support for peer-to-peer DMA (Logan Gunthorpe)

 - Add sysfs group for PCI peer-to-peer memory statistics (Logan
   Gunthorpe)

 - Add PCI peer-to-peer DMA scatterlist mapping interface (Logan
   Gunthorpe)

 - Add PCI configfs/sysfs helpers for use by peer-to-peer users (Logan
   Gunthorpe)

 - Add PCI peer-to-peer DMA driver writer's documentation (Logan
   Gunthorpe)

 - Add block layer flag to indicate driver support for PCI peer-to-peer
   DMA (Logan Gunthorpe)

 - Map Infiniband scatterlists for peer-to-peer DMA if they contain P2P
   memory (Logan Gunthorpe)

 - Register nvme-pci CMB buffer as PCI peer-to-peer memory (Logan
   Gunthorpe)

 - Add nvme-pci support for PCI peer-to-peer memory in requests (Logan
   Gunthorpe)

 - Use PCI peer-to-peer memory in nvme (Stephen Bates, Steve Wise,
   Christoph Hellwig, Logan Gunthorpe)

 - Cache VF config space size to optimize enumeration of many VFs
   (KarimAllah Ahmed)

 - Remove unnecessary <linux/pci-ats.h> include (Bjorn Helgaas)

 - Fix VMD AERSID quirk Device ID matching (Jon Derrick)

 - Fix Cadence PHY handling during probe (Alan Douglas)

 - Signal Cadence Endpoint interrupts via AXI region 0 instead of last
   region (Alan Douglas)

 - Write Cadence Endpoint MSI interrupts with 32 bits of data (Alan
   Douglas)

 - Remove redundant controller tests for "device_type == pci" (Rob
   Herring)

 - Document R-Car E3 (R8A77990) bindings (Tho Vu)

 - Add device tree support for R-Car r8a7744 (Biju Das)

 - Drop unused mvebu PCIe capability code (Thomas Petazzoni)

 - Add shared PCI bridge emulation code (Thomas Petazzoni)

 - Convert mvebu to use shared PCI bridge emulation (Thomas Petazzoni)

 - Add aardvark Root Port emulation (Thomas Petazzoni)

 - Support 100MHz/200MHz refclocks for i.MX6 (Lucas Stach)

 - Add initial power management for i.MX7 (Leonard Crestez)

 - Add PME_Turn_Off support for i.MX7 (Leonard Crestez)

 - Fix qcom runtime power management error handling (Bjorn Andersson)

 - Update TI dra7xx unaligned access errata workaround for host mode as
   well as endpoint mode (Vignesh R)

 - Fix kirin section mismatch warning (Nathan Chancellor)

 - Remove iproc PAXC slot check to allow VF support (Jitendra Bhivare)

 - Quirk Keystone K2G to limit MRRS to 256 (Kishon Vijay Abraham I)

 - Update Keystone to use MRRS quirk for host bridge instead of open
   coding (Kishon Vijay Abraham I)

 - Refactor Keystone link establishment (Kishon Vijay Abraham I)

 - Simplify and speed up Keystone link training (Kishon Vijay Abraham I)

 - Remove unused Keystone host_init argument (Kishon Vijay Abraham I)

 - Merge Keystone driver files into one (Kishon Vijay Abraham I)

 - Remove redundant Keystone platform_set_drvdata() (Kishon Vijay
   Abraham I)

 - Rename Keystone functions for uniformity (Kishon Vijay Abraham I)

 - Add Keystone device control module DT binding (Kishon Vijay Abraham
   I)

 - Use SYSCON API to get Keystone control module device IDs (Kishon
   Vijay Abraham I)

 - Clean up Keystone PHY handling (Kishon Vijay Abraham I)

 - Use runtime PM APIs to enable Keystone clock (Kishon Vijay Abraham I)

 - Clean up Keystone config space access checks (Kishon Vijay Abraham I)

 - Get Keystone outbound window count from DT (Kishon Vijay Abraham I)

 - Clean up Keystone outbound window configuration (Kishon Vijay Abraham
   I)

 - Clean up Keystone DBI setup (Kishon Vijay Abraham I)

 - Clean up Keystone ks_pcie_link_up() (Kishon Vijay Abraham I)

 - Fix Keystone IRQ status checking (Kishon Vijay Abraham I)

 - Add debug messages for all Keystone errors (Kishon Vijay Abraham I)

 - Clean up Keystone includes and macros (Kishon Vijay Abraham I)

 - Fix Mediatek unchecked return value from devm_pci_remap_iospace()
   (Gustavo A. R. Silva)

 - Fix Mediatek endpoint/port matching logic (Honghui Zhang)

 - Change Mediatek Root Port Class Code to PCI_CLASS_BRIDGE_PCI (Honghui
   Zhang)

 - Remove redundant Mediatek PM domain check (Honghui Zhang)

 - Convert Mediatek to pci_host_probe() (Honghui Zhang)

 - Fix Mediatek MSI enablement (Honghui Zhang)

 - Add Mediatek system PM support for MT2712 and MT7622 (Honghui Zhang)

 - Add Mediatek loadable module support (Honghui Zhang)

 - Detach VMD resources after stopping root bus to prevent orphan
   resources (Jon Derrick)

 - Convert pcitest build process to that used by other tools (iio, perf,
   etc) (Gustavo Pimentel)

* tag 'pci-v4.20-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (140 commits)
  PCI/AER: Refactor error injection fallbacks
  PCI/AER: Abstract AER interrupt handling
  PCI/AER: Reuse existing pcie_port_find_device() interface
  PCI/AER: Use managed resource allocations
  PCI: pcie: Remove redundant 'default n' from Kconfig
  PCI: aardvark: Implement emulated root PCI bridge config space
  PCI: mvebu: Convert to PCI emulated bridge config space
  PCI: mvebu: Drop unused PCI express capability code
  PCI: Introduce PCI bridge emulated config space common logic
  PCI: vmd: Detach resources after stopping root bus
  nvmet: Optionally use PCI P2P memory
  nvmet: Introduce helper functions to allocate and free request SGLs
  nvme-pci: Add support for P2P memory in requests
  nvme-pci: Use PCI p2pmem subsystem to manage the CMB
  IB/core: Ensure we map P2P memory correctly in rdma_rw_ctx_[init|destroy]()
  block: Add PCI P2P flag for request queue
  PCI/P2PDMA: Add P2P DMA driver writer's documentation
  docs-rst: Add a new directory for PCI documentation
  PCI/P2PDMA: Introduce configfs/sysfs enable attribute helpers
  PCI/P2PDMA: Add PCI p2pmem DMA mappings to adjust the bus offset
  ...
2018-10-25 06:50:48 -07:00

878 lines
23 KiB
C

// 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/srcu.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
#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 PCI_REG_VMLOCK 0x70
#define MB2_SHADOW_EN(vmlock) (vmlock & 0x2)
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),
};
/*
* 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.
*/
struct vmd_irq_list {
struct list_head irq_list;
struct srcu_struct srcu;
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);
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)
{
int i, best = 1;
unsigned long flags;
if (vmd->msix_count == 1)
return &vmd->irqs[0];
/*
* 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[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_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,
};
#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 const 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);
}
static u64 vmd_get_required_mask(struct device *dev)
{
return vmd_dma_ops(dev)->get_required_mask(to_vmd_dev(dev));
}
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);
ASSIGN_VMD_DMA_OPS(source, dest, get_required_mask);
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 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_enable_domain(struct vmd_dev *vmd, unsigned long features)
{
struct pci_sysdata *sd = &vmd->sysdata;
struct fwnode_handle *fn;
struct resource *res;
u32 upper_bits;
unsigned long flags;
LIST_HEAD(resources);
resource_size_t offset[2] = {0};
resource_size_t membar2_offset = 0x2000, busn_start = 0;
/*
* 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) {
u32 vmlock;
int ret;
membar2_offset = 0x2018;
ret = pci_read_config_dword(vmd->dev, PCI_REG_VMLOCK, &vmlock);
if (ret || vmlock == ~0)
return -ENODEV;
if (MB2_SHADOW_EN(vmlock)) {
void __iomem *membar2;
membar2 = pci_iomap(vmd->dev, VMD_MEMBAR2, 0);
if (!membar2)
return -ENOMEM;
offset[0] = vmd->dev->resource[VMD_MEMBAR1].start -
readq(membar2 + 0x2008);
offset[1] = vmd->dev->resource[VMD_MEMBAR2].start -
readq(membar2 + 0x2010);
pci_iounmap(vmd->dev, membar2);
}
}
/*
* Certain VMD devices may have a root port configuration option which
* limits the bus range to between 0-127 or 128-255
*/
if (features & VMD_FEAT_HAS_BUS_RESTRICTIONS) {
u32 vmcap, vmconfig;
pci_read_config_dword(vmd->dev, PCI_REG_VMCAP, &vmcap);
pci_read_config_dword(vmd->dev, PCI_REG_VMCONFIG, &vmconfig);
if (BUS_RESTRICT_CAP(vmcap) &&
(BUS_RESTRICT_CFG(vmconfig) == 0x1))
busn_start = 128;
}
res = &vmd->dev->resource[VMD_CFGBAR];
vmd->resources[0] = (struct resource) {
.name = "VMD CFGBAR",
.start = busn_start,
.end = 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-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 + membar2_offset,
.end = res->end,
.flags = flags,
.parent = res,
};
sd->vmd_domain = true;
sd->domain = vmd_find_free_domain();
if (sd->domain < 0)
return sd->domain;
sd->node = pcibus_to_node(vmd->dev->bus);
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,
x86_vector_domain);
irq_domain_free_fwnode(fn);
if (!vmd->irq_domain)
return -ENODEV;
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, busn_start, &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;
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_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);
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);
err = devm_request_irq(&dev->dev, pci_irq_vector(dev, i),
vmd_irq, IRQF_NO_THREAD,
"vmd", &vmd->irqs[i]);
if (err)
return err;
}
spin_lock_init(&vmd->cfg_lock);
pci_set_drvdata(dev, vmd);
err = vmd_enable_domain(vmd, (unsigned long) id->driver_data);
if (err)
return err;
dev_info(&vmd->dev->dev, "Bound to PCI domain %04x\n",
vmd->sysdata.domain);
return 0;
}
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_teardown_dma_ops(vmd);
vmd_detach_resources(vmd);
irq_domain_remove(vmd->irq_domain);
}
#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, pci_irq_vector(pdev, i), &vmd->irqs[i]);
pci_save_state(pdev);
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;
for (i = 0; i < vmd->msix_count; i++) {
err = devm_request_irq(dev, pci_irq_vector(pdev, i),
vmd_irq, IRQF_NO_THREAD,
"vmd", &vmd->irqs[i]);
if (err)
return err;
}
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, PCI_DEVICE_ID_INTEL_VMD_201D),},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_28C0),
.driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW |
VMD_FEAT_HAS_BUS_RESTRICTIONS,},
{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");