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-rw-r--r--drivers/pci/bus.c70
-rw-r--r--drivers/pci/hotplug/ibmphp_ebda.c6
-rw-r--r--drivers/pci/pci-sysfs.c23
-rw-r--r--drivers/pci/pci.c12
-rw-r--r--drivers/pci/pci.h7
-rw-r--r--drivers/pci/proc.c2
6 files changed, 91 insertions, 29 deletions
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 5624db8c9ad..003170ea2e3 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -64,17 +64,57 @@ void pci_bus_remove_resources(struct pci_bus *bus)
}
}
+static bool pci_bus_resource_better(struct resource *res1, bool pos1,
+ struct resource *res2, bool pos2)
+{
+ /* If exactly one is positive decode, always prefer that one */
+ if (pos1 != pos2)
+ return pos1 ? true : false;
+
+ /* Prefer the one that contains the highest address */
+ if (res1->end != res2->end)
+ return (res1->end > res2->end) ? true : false;
+
+ /* Otherwise, prefer the one with highest "center of gravity" */
+ if (res1->start != res2->start)
+ return (res1->start > res2->start) ? true : false;
+
+ /* Otherwise, choose one arbitrarily (but consistently) */
+ return (res1 > res2) ? true : false;
+}
+
+static bool pci_bus_resource_positive(struct pci_bus *bus, struct resource *res)
+{
+ struct pci_bus_resource *bus_res;
+
+ /*
+ * This relies on the fact that pci_bus.resource[] refers to P2P or
+ * CardBus bridge base/limit registers, which are always positively
+ * decoded. The pci_bus.resources list contains host bridge or
+ * subtractively decoded resources.
+ */
+ list_for_each_entry(bus_res, &bus->resources, list) {
+ if (bus_res->res == res)
+ return (bus_res->flags & PCI_SUBTRACTIVE_DECODE) ?
+ false : true;
+ }
+ return true;
+}
+
/*
- * Find the highest-address bus resource below the cursor "res". If the
- * cursor is NULL, return the highest resource.
+ * Find the next-best bus resource after the cursor "res". If the cursor is
+ * NULL, return the best resource. "Best" means that we prefer positive
+ * decode regions over subtractive decode, then those at higher addresses.
*/
static struct resource *pci_bus_find_resource_prev(struct pci_bus *bus,
unsigned int type,
struct resource *res)
{
+ bool res_pos, r_pos, prev_pos = false;
struct resource *r, *prev = NULL;
int i;
+ res_pos = pci_bus_resource_positive(bus, res);
pci_bus_for_each_resource(bus, r, i) {
if (!r)
continue;
@@ -82,26 +122,14 @@ static struct resource *pci_bus_find_resource_prev(struct pci_bus *bus,
if ((r->flags & IORESOURCE_TYPE_BITS) != type)
continue;
- /* If this resource is at or past the cursor, skip it */
- if (res) {
- if (r == res)
- continue;
- if (r->end > res->end)
- continue;
- if (r->end == res->end && r->start > res->start)
- continue;
+ r_pos = pci_bus_resource_positive(bus, r);
+ if (!res || pci_bus_resource_better(res, res_pos, r, r_pos)) {
+ if (!prev || pci_bus_resource_better(r, r_pos,
+ prev, prev_pos)) {
+ prev = r;
+ prev_pos = r_pos;
+ }
}
-
- if (!prev)
- prev = r;
-
- /*
- * A small resource is higher than a large one that ends at
- * the same address.
- */
- if (r->end > prev->end ||
- (r->end == prev->end && r->start > prev->start))
- prev = r;
}
return prev;
diff --git a/drivers/pci/hotplug/ibmphp_ebda.c b/drivers/pci/hotplug/ibmphp_ebda.c
index 5becbdee402..2850e64deda 100644
--- a/drivers/pci/hotplug/ibmphp_ebda.c
+++ b/drivers/pci/hotplug/ibmphp_ebda.c
@@ -276,6 +276,12 @@ int __init ibmphp_access_ebda (void)
for (;;) {
offset = next_offset;
+
+ /* Make sure what we read is still in the mapped section */
+ if (WARN(offset > (ebda_sz * 1024 - 4),
+ "ibmphp_ebda: next read is beyond ebda_sz\n"))
+ break;
+
next_offset = readw (io_mem + offset); /* offset of next blk */
offset += 2;
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index b5a7d9bfcb2..95712a375cd 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -705,17 +705,21 @@ void pci_remove_legacy_files(struct pci_bus *b)
#ifdef HAVE_PCI_MMAP
-int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma)
+int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
+ enum pci_mmap_api mmap_api)
{
- unsigned long nr, start, size;
+ unsigned long nr, start, size, pci_start;
+ if (pci_resource_len(pdev, resno) == 0)
+ return 0;
nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
start = vma->vm_pgoff;
size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
- if (start < size && size - start >= nr)
+ pci_start = (mmap_api == PCI_MMAP_SYSFS) ?
+ pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
+ if (start >= pci_start && start < pci_start + size &&
+ start + nr <= pci_start + size)
return 1;
- WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
- current->comm, start, start+nr, pci_name(pdev), resno, size);
return 0;
}
@@ -745,8 +749,15 @@ pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
if (i >= PCI_ROM_RESOURCE)
return -ENODEV;
- if (!pci_mmap_fits(pdev, i, vma))
+ if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
+ WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
+ "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
+ current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
+ pci_name(pdev), i,
+ (u64)pci_resource_start(pdev, i),
+ (u64)pci_resource_len(pdev, i));
return -EINVAL;
+ }
/* pci_mmap_page_range() expects the same kind of entry as coming
* from /proc/bus/pci/ which is a "user visible" value. If this is
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e98c8104297..710c8a29be0 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1007,6 +1007,18 @@ static int __pci_enable_device_flags(struct pci_dev *dev,
int err;
int i, bars = 0;
+ /*
+ * Power state could be unknown at this point, either due to a fresh
+ * boot or a device removal call. So get the current power state
+ * so that things like MSI message writing will behave as expected
+ * (e.g. if the device really is in D0 at enable time).
+ */
+ if (dev->pm_cap) {
+ u16 pmcsr;
+ pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
+ dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
+ }
+
if (atomic_add_return(1, &dev->enable_cnt) > 1)
return 0; /* already enabled */
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index f5c7c382765..7d33f667386 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -22,8 +22,13 @@ extern void pci_remove_firmware_label_files(struct pci_dev *pdev);
#endif
extern void pci_cleanup_rom(struct pci_dev *dev);
#ifdef HAVE_PCI_MMAP
+enum pci_mmap_api {
+ PCI_MMAP_SYSFS, /* mmap on /sys/bus/pci/devices/<BDF>/resource<N> */
+ PCI_MMAP_PROCFS /* mmap on /proc/bus/pci/<BDF> */
+};
extern int pci_mmap_fits(struct pci_dev *pdev, int resno,
- struct vm_area_struct *vma);
+ struct vm_area_struct *vmai,
+ enum pci_mmap_api mmap_api);
#endif
int pci_probe_reset_function(struct pci_dev *dev);
diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index 297b72c880a..ea00647f473 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -257,7 +257,7 @@ static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
/* Make sure the caller is mapping a real resource for this device */
for (i = 0; i < PCI_ROM_RESOURCE; i++) {
- if (pci_mmap_fits(dev, i, vma))
+ if (pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
break;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-22 17:31:12 +0000