summaryrefslogtreecommitdiffstats
path: root/drivers/pci
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pci.c120
-rw-r--r--drivers/pci/pci.h6
-rw-r--r--drivers/pci/quirks.c60
-rw-r--r--drivers/pci/setup-res.c15
4 files changed, 201 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 8310dc2f943..a35a8b2ba63 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);
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 07c0aa5275e..2cd1cba7236 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -195,4 +195,10 @@ static inline int pci_ari_enabled(struct pci_bus *bus)
return bus->self && bus->self->ari_enabled;
}
+#ifdef CONFIG_PCI_QUIRKS
+extern int pci_is_reassigndev(struct pci_dev *dev);
+resource_size_t pci_specified_resource_alignment(struct pci_dev *dev);
+extern void pci_disable_bridge_window(struct pci_dev *dev);
+#endif
+
#endif /* DRIVERS_PCI_H */
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 5aa2afb23ef..50233818a76 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -24,6 +24,7 @@
#include <linux/kallsyms.h>
#include <linux/dmi.h>
#include <linux/pci-aspm.h>
+#include <linux/ioport.h>
#include "pci.h"
int isa_dma_bridge_buggy;
@@ -34,6 +35,65 @@ int pcie_mch_quirk;
EXPORT_SYMBOL(pcie_mch_quirk);
#ifdef CONFIG_PCI_QUIRKS
+/*
+ * This quirk function disables the device and releases resources
+ * which is specified by kernel's boot parameter 'pci=resource_alignment='.
+ * It also rounds up size to specified alignment.
+ * Later on, the kernel will assign page-aligned memory resource back
+ * to that device.
+ */
+static void __devinit quirk_resource_alignment(struct pci_dev *dev)
+{
+ int i;
+ struct resource *r;
+ resource_size_t align, size;
+
+ if (!pci_is_reassigndev(dev))
+ return;
+
+ if (dev->hdr_type == PCI_HEADER_TYPE_NORMAL &&
+ (dev->class >> 8) == PCI_CLASS_BRIDGE_HOST) {
+ dev_warn(&dev->dev,
+ "Can't reassign resources to host bridge.\n");
+ return;
+ }
+
+ dev_info(&dev->dev, "Disabling device and release resources.\n");
+ pci_disable_device(dev);
+
+ align = pci_specified_resource_alignment(dev);
+ for (i=0; i < PCI_BRIDGE_RESOURCES; i++) {
+ r = &dev->resource[i];
+ if (!(r->flags & IORESOURCE_MEM))
+ continue;
+ size = resource_size(r);
+ if (size < align) {
+ size = align;
+ dev_info(&dev->dev,
+ "Rounding up size of resource #%d to %#llx.\n",
+ i, (unsigned long long)size);
+ }
+ r->end = size - 1;
+ r->start = 0;
+ }
+ /* Need to disable bridge's resource window,
+ * to enable the kernel to reassign new resource
+ * window later on.
+ */
+ if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
+ (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
+ for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) {
+ r = &dev->resource[i];
+ if (!(r->flags & IORESOURCE_MEM))
+ continue;
+ r->end = resource_size(r) - 1;
+ r->start = 0;
+ }
+ pci_disable_bridge_window(dev);
+ }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, quirk_resource_alignment);
+
/* The Mellanox Tavor device gives false positive parity errors
* Mark this device with a broken_parity_status, to allow
* PCI scanning code to "skip" this now blacklisted device.
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 32e8d88a461..3039fcb86af 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -120,6 +120,21 @@ int pci_claim_resource(struct pci_dev *dev, int resource)
return err;
}
+#ifdef CONFIG_PCI_QUIRKS
+void pci_disable_bridge_window(struct pci_dev *dev)
+{
+ dev_dbg(&dev->dev, "Disabling bridge window.\n");
+
+ /* MMIO Base/Limit */
+ pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
+
+ /* Prefetchable MMIO Base/Limit */
+ pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
+ pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0);
+ pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff);
+}
+#endif /* CONFIG_PCI_QUIRKS */
+
int pci_assign_resource(struct pci_dev *dev, int resno)
{
struct pci_bus *bus = dev->bus;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-24 08:58:11 +0000