PCI: allow assignment of memory resources with a specified alignment

This patch allows memory resources to be assigned with a specified
alignment at boot-time or run-time. The patch is useful when we use PCI
pass-through, because page-aligned memory resources are required to
securely share PCI resources with guest drivers.

If you want to assign the resource at boot time, please set
"pci=resource_alignment=" boot parameter.

This is format of "pci=resource_alignment=" boot parameter:

        [<order of align>@][<domain>:]<bus>:<slot>.<func>[; ...]
                Specifies alignment and device to reassign
                aligned memory resources.
                If <order of align> is not specified, PAGE_SIZE is
                used as alignment.
                PCI-PCI bridge can be specified, if resource
                windows need to be expanded.

This is example:

        pci=resource_alignment=20@07:00.0;18@0f:00.0;00:1d.7

If you want to assign the resource at run-time, please set
"/sys/bus/pci/resource_alignment" file, and hot-remove the device and
hot-add the device.  For this purpose, fakephp or PCI hotplug interfaces
can be used.

The format of "/sys/bus/pci/resource_alignment" file is the same with
boot parameter. You can use "," instead of ";".

For example:

        # cd /sys/bus/pci
        # echo -n 20@12:00.0 > resource_alignment
        # echo 1 > devices/0000:12:00.0/remove
        # echo 1 > rescan

Reviewed-by: Alex Chiang <achiang@hp.com>
Reviewed-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Yuji Shimada <shimada-yxb@necst.nec.co.jp>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 120 insertions, 0 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 8310dc2f943b..a35a8b2ba631 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -20,6 +20,8 @@
 #include <linux/pm_wakeup.h>
 #include <linux/interrupt.h>
 #include <asm/dma.h>    /* isa_dma_bridge_buggy */
+#include <linux/device.h>
+#include <asm/setup.h>
 #include "pci.h"
 
 unsigned int pci_pm_d3_delay = PCI_PM_D3_WAIT;
@@ -2370,6 +2372,121 @@ int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type)
         return 0;
 }
 
+#define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
+static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0};
+spinlock_t resource_alignment_lock = SPIN_LOCK_UNLOCKED;
+
+/**
+ * pci_specified_resource_alignment - get resource alignment specified by user.
+ * @dev: the PCI device to get
+ *
+ * RETURNS: Resource alignment if it is specified.
+ *          Zero if it is not specified.
+ */
+resource_size_t pci_specified_resource_alignment(struct pci_dev *dev)
+{
+        int seg, bus, slot, func, align_order, count;
+        resource_size_t align = 0;
+        char *p;
+
+        spin_lock(&resource_alignment_lock);
+        p = resource_alignment_param;
+        while (*p) {
+                count = 0;
+                if (sscanf(p, "%d%n", &align_order, &count) == 1 &&
+                                                        p[count] == '@') {
+                        p += count + 1;
+                } else {
+                        align_order = -1;
+                }
+                if (sscanf(p, "%x:%x:%x.%x%n",
+                        &seg, &bus, &slot, &func, &count) != 4) {
+                        seg = 0;
+                        if (sscanf(p, "%x:%x.%x%n",
+                                        &bus, &slot, &func, &count) != 3) {
+                                /* Invalid format */
+                                printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: %s\n",
+                                        p);
+                                break;
+                        }
+                }
+                p += count;
+                if (seg == pci_domain_nr(dev->bus) &&
+                        bus == dev->bus->number &&
+                        slot == PCI_SLOT(dev->devfn) &&
+                        func == PCI_FUNC(dev->devfn)) {
+                        if (align_order == -1) {
+                                align = PAGE_SIZE;
+                        } else {
+                                align = 1 << align_order;
+                        }
+                        /* Found */
+                        break;
+                }
+                if (*p != ';' && *p != ',') {
+                        /* End of param or invalid format */
+                        break;
+                }
+                p++;
+        }
+        spin_unlock(&resource_alignment_lock);
+        return align;
+}
+
+/**
+ * pci_is_reassigndev - check if specified PCI is target device to reassign
+ * @dev: the PCI device to check
+ *
+ * RETURNS: non-zero for PCI device is a target device to reassign,
+ *          or zero is not.
+ */
+int pci_is_reassigndev(struct pci_dev *dev)
+{
+        return (pci_specified_resource_alignment(dev) != 0);
+}
+
+ssize_t pci_set_resource_alignment_param(const char *buf, size_t count)
+{
+        if (count > RESOURCE_ALIGNMENT_PARAM_SIZE - 1)
+                count = RESOURCE_ALIGNMENT_PARAM_SIZE - 1;
+        spin_lock(&resource_alignment_lock);
+        strncpy(resource_alignment_param, buf, count);
+        resource_alignment_param[count] = '\0';
+        spin_unlock(&resource_alignment_lock);
+        return count;
+}
+
+ssize_t pci_get_resource_alignment_param(char *buf, size_t size)
+{
+        size_t count;
+        spin_lock(&resource_alignment_lock);
+        count = snprintf(buf, size, "%s", resource_alignment_param);
+        spin_unlock(&resource_alignment_lock);
+        return count;
+}
+
+static ssize_t pci_resource_alignment_show(struct bus_type *bus, char *buf)
+{
+        return pci_get_resource_alignment_param(buf, PAGE_SIZE);
+}
+
+static ssize_t pci_resource_alignment_store(struct bus_type *bus,
+                                        const char *buf, size_t count)
+{
+        return pci_set_resource_alignment_param(buf, count);
+}
+
+BUS_ATTR(resource_alignment, 0644, pci_resource_alignment_show,
+                                        pci_resource_alignment_store);
+
+static int __init pci_resource_alignment_sysfs_init(void)
+{
+        return bus_create_file(&pci_bus_type,
+                                        &bus_attr_resource_alignment);
+}
+
+late_initcall(pci_resource_alignment_sysfs_init);
+
 static void __devinit pci_no_domains(void)
 {
 #ifdef CONFIG_PCI_DOMAINS
@@ -2418,6 +2535,9 @@ static int __init pci_setup(char *str)
                                 pci_cardbus_io_size = memparse(str + 9, &str);
                         } else if (!strncmp(str, "cbmemsize=", 10)) {
                                 pci_cardbus_mem_size = memparse(str + 10, &str);
+                        } else if (!strncmp(str, "resource_alignment=", 19)) {
+                                pci_set_resource_alignment_param(str + 19,
+                                                        strlen(str + 19));
                         } else {
                                 printk(KERN_ERR "PCI: Unknown option `%s'\n",
                                                 str);