[Xen-changelog] [xen-unstable] [IA64] Import arch/ia64/pci/pci.c into sparse tree

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[Xen-changelog] [xen-unstable] [IA64] Import arch/ia64/pci/pci.c into sparse tree

Xen patchbot-unstable
# HG changeset patch
# User [hidden email]
# Date 1171839458 25200
# Node ID 5ad7d9b466eed042418944402120afafb68a8408
# Parent  779d21cf58e77f080bb3a00417dcd8a6ca38ff3c
[IA64] Import arch/ia64/pci/pci.c into sparse tree

Necessary for paravirtualizing mmap handler for /proc/bus/pci

Signed-off-by: Akio Takebe <[hidden email]>
---
 linux-2.6-xen-sparse/arch/ia64/pci/pci.c |  820 +++++++++++++++++++++++++++++++
 1 files changed, 820 insertions(+)

diff -r 779d21cf58e7 -r 5ad7d9b466ee linux-2.6-xen-sparse/arch/ia64/pci/pci.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/linux-2.6-xen-sparse/arch/ia64/pci/pci.c Sun Feb 18 15:57:38 2007 -0700
@@ -0,0 +1,820 @@
+/*
+ * pci.c - Low-Level PCI Access in IA-64
+ *
+ * Derived from bios32.c of i386 tree.
+ *
+ * (c) Copyright 2002, 2005 Hewlett-Packard Development Company, L.P.
+ * David Mosberger-Tang <[hidden email]>
+ * Bjorn Helgaas <[hidden email]>
+ * Copyright (C) 2004 Silicon Graphics, Inc.
+ *
+ * Note: Above list of copyright holders is incomplete...
+ */
+
+#include <linux/acpi.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/spinlock.h>
+
+#include <asm/machvec.h>
+#include <asm/page.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/sal.h>
+#include <asm/smp.h>
+#include <asm/irq.h>
+#include <asm/hw_irq.h>
+
+/*
+ * Low-level SAL-based PCI configuration access functions. Note that SAL
+ * calls are already serialized (via sal_lock), so we don't need another
+ * synchronization mechanism here.
+ */
+
+#define PCI_SAL_ADDRESS(seg, bus, devfn, reg) \
+ (((u64) seg << 24) | (bus << 16) | (devfn << 8) | (reg))
+
+/* SAL 3.2 adds support for extended config space. */
+
+#define PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg) \
+ (((u64) seg << 28) | (bus << 20) | (devfn << 12) | (reg))
+
+static int
+pci_sal_read (unsigned int seg, unsigned int bus, unsigned int devfn,
+      int reg, int len, u32 *value)
+{
+ u64 addr, data = 0;
+ int mode, result;
+
+ if (!value || (seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
+ return -EINVAL;
+
+ if ((seg | reg) <= 255) {
+ addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
+ mode = 0;
+ } else {
+ addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
+ mode = 1;
+ }
+ result = ia64_sal_pci_config_read(addr, mode, len, &data);
+ if (result != 0)
+ return -EINVAL;
+
+ *value = (u32) data;
+ return 0;
+}
+
+static int
+pci_sal_write (unsigned int seg, unsigned int bus, unsigned int devfn,
+       int reg, int len, u32 value)
+{
+ u64 addr;
+ int mode, result;
+
+ if ((seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
+ return -EINVAL;
+
+ if ((seg | reg) <= 255) {
+ addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
+ mode = 0;
+ } else {
+ addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
+ mode = 1;
+ }
+ result = ia64_sal_pci_config_write(addr, mode, len, value);
+ if (result != 0)
+ return -EINVAL;
+ return 0;
+}
+
+static struct pci_raw_ops pci_sal_ops = {
+ .read = pci_sal_read,
+ .write = pci_sal_write
+};
+
+struct pci_raw_ops *raw_pci_ops = &pci_sal_ops;
+
+static int
+pci_read (struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
+{
+ return raw_pci_ops->read(pci_domain_nr(bus), bus->number,
+ devfn, where, size, value);
+}
+
+static int
+pci_write (struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
+{
+ return raw_pci_ops->write(pci_domain_nr(bus), bus->number,
+  devfn, where, size, value);
+}
+
+struct pci_ops pci_root_ops = {
+ .read = pci_read,
+ .write = pci_write,
+};
+
+/* Called by ACPI when it finds a new root bus.  */
+
+static struct pci_controller * __devinit
+alloc_pci_controller (int seg)
+{
+ struct pci_controller *controller;
+
+ controller = kmalloc(sizeof(*controller), GFP_KERNEL);
+ if (!controller)
+ return NULL;
+
+ memset(controller, 0, sizeof(*controller));
+ controller->segment = seg;
+ controller->node = -1;
+ return controller;
+}
+
+struct pci_root_info {
+ struct pci_controller *controller;
+ char *name;
+};
+
+static unsigned int
+new_space (u64 phys_base, int sparse)
+{
+ u64 mmio_base;
+ int i;
+
+ if (phys_base == 0)
+ return 0; /* legacy I/O port space */
+
+ mmio_base = (u64) ioremap(phys_base, 0);
+ for (i = 0; i < num_io_spaces; i++)
+ if (io_space[i].mmio_base == mmio_base &&
+    io_space[i].sparse == sparse)
+ return i;
+
+ if (num_io_spaces == MAX_IO_SPACES) {
+ printk(KERN_ERR "PCI: Too many IO port spaces "
+ "(MAX_IO_SPACES=%lu)\n", MAX_IO_SPACES);
+ return ~0;
+ }
+
+ i = num_io_spaces++;
+ io_space[i].mmio_base = mmio_base;
+ io_space[i].sparse = sparse;
+
+ return i;
+}
+
+static u64 __devinit
+add_io_space (struct pci_root_info *info, struct acpi_resource_address64 *addr)
+{
+ struct resource *resource;
+ char *name;
+ u64 base, min, max, base_port;
+ unsigned int sparse = 0, space_nr, len;
+
+ resource = kzalloc(sizeof(*resource), GFP_KERNEL);
+ if (!resource) {
+ printk(KERN_ERR "PCI: No memory for %s I/O port space\n",
+ info->name);
+ goto out;
+ }
+
+ len = strlen(info->name) + 32;
+ name = kzalloc(len, GFP_KERNEL);
+ if (!name) {
+ printk(KERN_ERR "PCI: No memory for %s I/O port space name\n",
+ info->name);
+ goto free_resource;
+ }
+
+ min = addr->minimum;
+ max = min + addr->address_length - 1;
+ if (addr->info.io.translation_type == ACPI_SPARSE_TRANSLATION)
+ sparse = 1;
+
+ space_nr = new_space(addr->translation_offset, sparse);
+ if (space_nr == ~0)
+ goto free_name;
+
+ base = __pa(io_space[space_nr].mmio_base);
+ base_port = IO_SPACE_BASE(space_nr);
+ snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->name,
+ base_port + min, base_port + max);
+
+ /*
+ * The SDM guarantees the legacy 0-64K space is sparse, but if the
+ * mapping is done by the processor (not the bridge), ACPI may not
+ * mark it as sparse.
+ */
+ if (space_nr == 0)
+ sparse = 1;
+
+ resource->name  = name;
+ resource->flags = IORESOURCE_MEM;
+ resource->start = base + (sparse ? IO_SPACE_SPARSE_ENCODING(min) : min);
+ resource->end   = base + (sparse ? IO_SPACE_SPARSE_ENCODING(max) : max);
+ insert_resource(&iomem_resource, resource);
+
+ return base_port;
+
+free_name:
+ kfree(name);
+free_resource:
+ kfree(resource);
+out:
+ return ~0;
+}
+
+static acpi_status __devinit resource_to_window(struct acpi_resource *resource,
+ struct acpi_resource_address64 *addr)
+{
+ acpi_status status;
+
+ /*
+ * We're only interested in _CRS descriptors that are
+ * - address space descriptors for memory or I/O space
+ * - non-zero size
+ * - producers, i.e., the address space is routed downstream,
+ *  not consumed by the bridge itself
+ */
+ status = acpi_resource_to_address64(resource, addr);
+ if (ACPI_SUCCESS(status) &&
+    (addr->resource_type == ACPI_MEMORY_RANGE ||
+     addr->resource_type == ACPI_IO_RANGE) &&
+    addr->address_length &&
+    addr->producer_consumer == ACPI_PRODUCER)
+ return AE_OK;
+
+ return AE_ERROR;
+}
+
+static acpi_status __devinit
+count_window (struct acpi_resource *resource, void *data)
+{
+ unsigned int *windows = (unsigned int *) data;
+ struct acpi_resource_address64 addr;
+ acpi_status status;
+
+ status = resource_to_window(resource, &addr);
+ if (ACPI_SUCCESS(status))
+ (*windows)++;
+
+ return AE_OK;
+}
+
+static __devinit acpi_status add_window(struct acpi_resource *res, void *data)
+{
+ struct pci_root_info *info = data;
+ struct pci_window *window;
+ struct acpi_resource_address64 addr;
+ acpi_status status;
+ unsigned long flags, offset = 0;
+ struct resource *root;
+
+ /* Return AE_OK for non-window resources to keep scanning for more */
+ status = resource_to_window(res, &addr);
+ if (!ACPI_SUCCESS(status))
+ return AE_OK;
+
+ if (addr.resource_type == ACPI_MEMORY_RANGE) {
+ flags = IORESOURCE_MEM;
+ root = &iomem_resource;
+ offset = addr.translation_offset;
+ } else if (addr.resource_type == ACPI_IO_RANGE) {
+ flags = IORESOURCE_IO;
+ root = &ioport_resource;
+ offset = add_io_space(info, &addr);
+ if (offset == ~0)
+ return AE_OK;
+ } else
+ return AE_OK;
+
+ window = &info->controller->window[info->controller->windows++];
+ window->resource.name = info->name;
+ window->resource.flags = flags;
+ window->resource.start = addr.minimum + offset;
+ window->resource.end = window->resource.start + addr.address_length - 1;
+ window->resource.child = NULL;
+ window->offset = offset;
+
+ if (insert_resource(root, &window->resource)) {
+ printk(KERN_ERR "alloc 0x%lx-0x%lx from %s for %s failed\n",
+ window->resource.start, window->resource.end,
+ root->name, info->name);
+ }
+
+ return AE_OK;
+}
+
+static void __devinit
+pcibios_setup_root_windows(struct pci_bus *bus, struct pci_controller *ctrl)
+{
+ int i, j;
+
+ j = 0;
+ for (i = 0; i < ctrl->windows; i++) {
+ struct resource *res = &ctrl->window[i].resource;
+ /* HP's firmware has a hack to work around a Windows bug.
+ * Ignore these tiny memory ranges */
+ if ((res->flags & IORESOURCE_MEM) &&
+    (res->end - res->start < 16))
+ continue;
+ if (j >= PCI_BUS_NUM_RESOURCES) {
+ printk("Ignoring range [%lx-%lx] (%lx)\n", res->start,
+ res->end, res->flags);
+ continue;
+ }
+ bus->resource[j++] = res;
+ }
+}
+
+struct pci_bus * __devinit
+pci_acpi_scan_root(struct acpi_device *device, int domain, int bus)
+{
+ struct pci_root_info info;
+ struct pci_controller *controller;
+ unsigned int windows = 0;
+ struct pci_bus *pbus;
+ char *name;
+ int pxm;
+
+ controller = alloc_pci_controller(domain);
+ if (!controller)
+ goto out1;
+
+ controller->acpi_handle = device->handle;
+
+ pxm = acpi_get_pxm(controller->acpi_handle);
+#ifdef CONFIG_NUMA
+ if (pxm >= 0)
+ controller->node = pxm_to_node(pxm);
+#endif
+
+ acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_window,
+ &windows);
+ controller->window = kmalloc_node(sizeof(*controller->window) * windows,
+ GFP_KERNEL, controller->node);
+ if (!controller->window)
+ goto out2;
+
+ name = kmalloc(16, GFP_KERNEL);
+ if (!name)
+ goto out3;
+
+ sprintf(name, "PCI Bus %04x:%02x", domain, bus);
+ info.controller = controller;
+ info.name = name;
+ acpi_walk_resources(device->handle, METHOD_NAME__CRS, add_window,
+ &info);
+
+ pbus = pci_scan_bus_parented(NULL, bus, &pci_root_ops, controller);
+ if (pbus)
+ pcibios_setup_root_windows(pbus, controller);
+
+ return pbus;
+
+out3:
+ kfree(controller->window);
+out2:
+ kfree(controller);
+out1:
+ return NULL;
+}
+
+void pcibios_resource_to_bus(struct pci_dev *dev,
+ struct pci_bus_region *region, struct resource *res)
+{
+ struct pci_controller *controller = PCI_CONTROLLER(dev);
+ unsigned long offset = 0;
+ int i;
+
+ for (i = 0; i < controller->windows; i++) {
+ struct pci_window *window = &controller->window[i];
+ if (!(window->resource.flags & res->flags))
+ continue;
+ if (window->resource.start > res->start)
+ continue;
+ if (window->resource.end < res->end)
+ continue;
+ offset = window->offset;
+ break;
+ }
+
+ region->start = res->start - offset;
+ region->end = res->end - offset;
+}
+EXPORT_SYMBOL(pcibios_resource_to_bus);
+
+void pcibios_bus_to_resource(struct pci_dev *dev,
+ struct resource *res, struct pci_bus_region *region)
+{
+ struct pci_controller *controller = PCI_CONTROLLER(dev);
+ unsigned long offset = 0;
+ int i;
+
+ for (i = 0; i < controller->windows; i++) {
+ struct pci_window *window = &controller->window[i];
+ if (!(window->resource.flags & res->flags))
+ continue;
+ if (window->resource.start - window->offset > region->start)
+ continue;
+ if (window->resource.end - window->offset < region->end)
+ continue;
+ offset = window->offset;
+ break;
+ }
+
+ res->start = region->start + offset;
+ res->end = region->end + offset;
+}
+EXPORT_SYMBOL(pcibios_bus_to_resource);
+
+static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
+{
+ unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
+ struct resource *devr = &dev->resource[idx];
+
+ if (!dev->bus)
+ return 0;
+ for (i=0; i<PCI_BUS_NUM_RESOURCES; i++) {
+ struct resource *busr = dev->bus->resource[i];
+
+ if (!busr || ((busr->flags ^ devr->flags) & type_mask))
+ continue;
+ if ((devr->start) && (devr->start >= busr->start) &&
+ (devr->end <= busr->end))
+ return 1;
+ }
+ return 0;
+}
+
+static void __devinit
+pcibios_fixup_resources(struct pci_dev *dev, int start, int limit)
+{
+ struct pci_bus_region region;
+ int i;
+
+ for (i = start; i < limit; i++) {
+ if (!dev->resource[i].flags)
+ continue;
+ region.start = dev->resource[i].start;
+ region.end = dev->resource[i].end;
+ pcibios_bus_to_resource(dev, &dev->resource[i], &region);
+ if ((is_valid_resource(dev, i)))
+ pci_claim_resource(dev, i);
+ }
+}
+
+static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
+{
+ pcibios_fixup_resources(dev, 0, PCI_BRIDGE_RESOURCES);
+}
+
+static void __devinit pcibios_fixup_bridge_resources(struct pci_dev *dev)
+{
+ pcibios_fixup_resources(dev, PCI_BRIDGE_RESOURCES, PCI_NUM_RESOURCES);
+}
+
+/*
+ *  Called after each bus is probed, but before its children are examined.
+ */
+void __devinit
+pcibios_fixup_bus (struct pci_bus *b)
+{
+ struct pci_dev *dev;
+
+ if (b->self) {
+ pci_read_bridge_bases(b);
+ pcibios_fixup_bridge_resources(b->self);
+ }
+ list_for_each_entry(dev, &b->devices, bus_list)
+ pcibios_fixup_device_resources(dev);
+
+ return;
+}
+
+void __devinit
+pcibios_update_irq (struct pci_dev *dev, int irq)
+{
+ pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
+
+ /* ??? FIXME -- record old value for shutdown.  */
+}
+
+static inline int
+pcibios_enable_resources (struct pci_dev *dev, int mask)
+{
+ u16 cmd, old_cmd;
+ int idx;
+ struct resource *r;
+ unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
+
+ if (!dev)
+ return -EINVAL;
+
+ pci_read_config_word(dev, PCI_COMMAND, &cmd);
+ old_cmd = cmd;
+ for (idx=0; idx<PCI_NUM_RESOURCES; idx++) {
+ /* Only set up the desired resources.  */
+ if (!(mask & (1 << idx)))
+ continue;
+
+ r = &dev->resource[idx];
+ if (!(r->flags & type_mask))
+ continue;
+ if ((idx == PCI_ROM_RESOURCE) &&
+ (!(r->flags & IORESOURCE_ROM_ENABLE)))
+ continue;
+ if (!r->start && r->end) {
+ printk(KERN_ERR
+       "PCI: Device %s not available because of resource collisions\n",
+       pci_name(dev));
+ return -EINVAL;
+ }
+ if (r->flags & IORESOURCE_IO)
+ cmd |= PCI_COMMAND_IO;
+ if (r->flags & IORESOURCE_MEM)
+ cmd |= PCI_COMMAND_MEMORY;
+ }
+ if (cmd != old_cmd) {
+ printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
+ pci_write_config_word(dev, PCI_COMMAND, cmd);
+ }
+ return 0;
+}
+
+int
+pcibios_enable_device (struct pci_dev *dev, int mask)
+{
+ int ret;
+
+ ret = pcibios_enable_resources(dev, mask);
+ if (ret < 0)
+ return ret;
+
+ return acpi_pci_irq_enable(dev);
+}
+
+void
+pcibios_disable_device (struct pci_dev *dev)
+{
+ acpi_pci_irq_disable(dev);
+}
+
+void
+pcibios_align_resource (void *data, struct resource *res,
+        resource_size_t size, resource_size_t align)
+{
+}
+
+/*
+ * PCI BIOS setup, always defaults to SAL interface
+ */
+char * __init
+pcibios_setup (char *str)
+{
+ return str;
+}
+
+int
+pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
+     enum pci_mmap_state mmap_state, int write_combine)
+{
+ /*
+ * I/O space cannot be accessed via normal processor loads and
+ * stores on this platform.
+ */
+ if (mmap_state == pci_mmap_io)
+ /*
+ * XXX we could relax this for I/O spaces for which ACPI
+ * indicates that the space is 1-to-1 mapped.  But at the
+ * moment, we don't support multiple PCI address spaces and
+ * the legacy I/O space is not 1-to-1 mapped, so this is moot.
+ */
+ return -EINVAL;
+
+ /*
+ * Leave vm_pgoff as-is, the PCI space address is the physical
+ * address on this platform.
+ */
+ if (write_combine && efi_range_is_wc(vma->vm_start,
+     vma->vm_end - vma->vm_start))
+ vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+ else
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+ if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+     vma->vm_end - vma->vm_start, vma->vm_page_prot))
+ return -EAGAIN;
+
+ return 0;
+}
+
+/**
+ * ia64_pci_get_legacy_mem - generic legacy mem routine
+ * @bus: bus to get legacy memory base address for
+ *
+ * Find the base of legacy memory for @bus.  This is typically the first
+ * megabyte of bus address space for @bus or is simply 0 on platforms whose
+ * chipsets support legacy I/O and memory routing.  Returns the base address
+ * or an error pointer if an error occurred.
+ *
+ * This is the ia64 generic version of this routine.  Other platforms
+ * are free to override it with a machine vector.
+ */
+char *ia64_pci_get_legacy_mem(struct pci_bus *bus)
+{
+ return (char *)__IA64_UNCACHED_OFFSET;
+}
+
+/**
+ * pci_mmap_legacy_page_range - map legacy memory space to userland
+ * @bus: bus whose legacy space we're mapping
+ * @vma: vma passed in by mmap
+ *
+ * Map legacy memory space for this device back to userspace using a machine
+ * vector to get the base address.
+ */
+int
+pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma)
+{
+ unsigned long size = vma->vm_end - vma->vm_start;
+ pgprot_t prot;
+ char *addr;
+
+ /*
+ * Avoid attribute aliasing.  See Documentation/ia64/aliasing.txt
+ * for more details.
+ */
+ if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
+ return -EINVAL;
+ prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
+    vma->vm_page_prot);
+ if (pgprot_val(prot) != pgprot_val(pgprot_noncached(vma->vm_page_prot)))
+ return -EINVAL;
+
+ addr = pci_get_legacy_mem(bus);
+ if (IS_ERR(addr))
+ return PTR_ERR(addr);
+
+ vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT;
+ vma->vm_page_prot = prot;
+
+ if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+    size, vma->vm_page_prot))
+ return -EAGAIN;
+
+ return 0;
+}
+
+/**
+ * ia64_pci_legacy_read - read from legacy I/O space
+ * @bus: bus to read
+ * @port: legacy port value
+ * @val: caller allocated storage for returned value
+ * @size: number of bytes to read
+ *
+ * Simply reads @size bytes from @port and puts the result in @val.
+ *
+ * Again, this (and the write routine) are generic versions that can be
+ * overridden by the platform.  This is necessary on platforms that don't
+ * support legacy I/O routing or that hard fail on legacy I/O timeouts.
+ */
+int ia64_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size)
+{
+ int ret = size;
+
+ switch (size) {
+ case 1:
+ *val = inb(port);
+ break;
+ case 2:
+ *val = inw(port);
+ break;
+ case 4:
+ *val = inl(port);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * ia64_pci_legacy_write - perform a legacy I/O write
+ * @bus: bus pointer
+ * @port: port to write
+ * @val: value to write
+ * @size: number of bytes to write from @val
+ *
+ * Simply writes @size bytes of @val to @port.
+ */
+int ia64_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size)
+{
+ int ret = size;
+
+ switch (size) {
+ case 1:
+ outb(val, port);
+ break;
+ case 2:
+ outw(val, port);
+ break;
+ case 4:
+ outl(val, port);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * pci_cacheline_size - determine cacheline size for PCI devices
+ * @dev: void
+ *
+ * We want to use the line-size of the outer-most cache.  We assume
+ * that this line-size is the same for all CPUs.
+ *
+ * Code mostly taken from arch/ia64/kernel/palinfo.c:cache_info().
+ *
+ * RETURNS: An appropriate -ERRNO error value on eror, or zero for success.
+ */
+static unsigned long
+pci_cacheline_size (void)
+{
+ u64 levels, unique_caches;
+ s64 status;
+ pal_cache_config_info_t cci;
+ static u8 cacheline_size;
+
+ if (cacheline_size)
+ return cacheline_size;
+
+ status = ia64_pal_cache_summary(&levels, &unique_caches);
+ if (status != 0) {
+ printk(KERN_ERR "%s: ia64_pal_cache_summary() failed (status=%ld)\n",
+       __FUNCTION__, status);
+ return SMP_CACHE_BYTES;
+ }
+
+ status = ia64_pal_cache_config_info(levels - 1, /* cache_type (data_or_unified)= */ 2,
+    &cci);
+ if (status != 0) {
+ printk(KERN_ERR "%s: ia64_pal_cache_config_info() failed (status=%ld)\n",
+       __FUNCTION__, status);
+ return SMP_CACHE_BYTES;
+ }
+ cacheline_size = 1 << cci.pcci_line_size;
+ return cacheline_size;
+}
+
+/**
+ * pcibios_prep_mwi - helper function for drivers/pci/pci.c:pci_set_mwi()
+ * @dev: the PCI device for which MWI is enabled
+ *
+ * For ia64, we can get the cacheline sizes from PAL.
+ *
+ * RETURNS: An appropriate -ERRNO error value on eror, or zero for success.
+ */
+int
+pcibios_prep_mwi (struct pci_dev *dev)
+{
+ unsigned long desired_linesize, current_linesize;
+ int rc = 0;
+ u8 pci_linesize;
+
+ desired_linesize = pci_cacheline_size();
+
+ pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &pci_linesize);
+ current_linesize = 4 * pci_linesize;
+ if (desired_linesize != current_linesize) {
+ printk(KERN_WARNING "PCI: slot %s has incorrect PCI cache line size of %lu bytes,",
+       pci_name(dev), current_linesize);
+ if (current_linesize > desired_linesize) {
+ printk(" expected %lu bytes instead\n", desired_linesize);
+ rc = -EINVAL;
+ } else {
+ printk(" correcting to %lu\n", desired_linesize);
+ pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, desired_linesize / 4);
+ }
+ }
+ return rc;
+}
+
+int pci_vector_resources(int last, int nr_released)
+{
+ int count = nr_released;
+
+ count += (IA64_LAST_DEVICE_VECTOR - last);
+
+ return count;
+}

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