On Thu, Nov 21, 2013 at 1:42 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Thu, Nov 21, 2013 at 1:34 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
>>
>> Here are suggestion is:
>> assume mmio pref: will be use for 64bit pref only, and if the mmio pref
>> does not support 64bit, we just ignore it.
>> If devices under that bridge need pref, we will just use range from bridge's
>> nonpref mmio.
>
> Since we always scan devices behind the bus, why don't we take that
> into account? If we find devices with 32-bit mmio, we try to make the
> prefetchable one be in the 32-bit range.
Refresh one old patch, and it will separate 32bit pref and 64bit pref depend
on the bridge capability.
| Subject: [PATCH] PCI: Try best to allocate pref mem 64 above 4g
|
| When one of children resources does not support MEM_64, MEM_64 for
| bridge get reset, so pull down whole resource under 4G.
|
| We could move those 32bit pref mmio under 32bit non-pref mmio of the bridge.
|
| If the bridge support pref mem 64, will only allocate that with pref mem64 to
| children that support it.
| For children resources if they only support pref mem 32, will allocate them
| from non pref mem instead.
|
| If the bridge only support 32bit pref mmio, will still have all children pref
| mmio under that.
Guo, Can you test it on top of those 6 patches ?
Thanks
Yinghai
Subject: [PATCH] PCI: Try best to allocate pref mem 64 above 4g
When one of children resources does not support MEM_64, MEM_64 for
bridge get reset, so pull down whole resource under 4G.
We could move those 32bit pref mmio under 32bit non-pref mmio of the bridge.
If the bridge support pref mem 64, will only allocate that with pref mem64 to
children that support it.
For children resources if they only support pref mem 32, will allocate them
from non pref mem instead.
If the bridge only support 32bit pref mmio, will still have all children pref
mmio under that.
-v2: Add release bridge res support with bridge mem res for pref_mem children res.
-v3: refresh and make it can be applied early before for_each_dev_res
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
drivers/pci/setup-bus.c | 133 +++++++++++++++++++++++++++++++-----------------
drivers/pci/setup-res.c | 14 ++++-
2 files changed, 101 insertions(+), 46 deletions(-)
Index: linux-2.6/drivers/pci/setup-bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/setup-bus.c
+++ linux-2.6/drivers/pci/setup-bus.c
@@ -711,12 +711,11 @@ static void pci_bridge_check_ranges(stru
bus resource of a given type. Note: we intentionally skip
the bus resources which have already been assigned (that is,
have non-NULL parent resource). */
-static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned long type)
+static struct resource *find_free_bus_resource(struct pci_bus *bus,
+ unsigned long type_mask, unsigned long type)
{
int i;
struct resource *r;
- unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
- IORESOURCE_PREFETCH;
pci_bus_for_each_resource(bus, r, i) {
if (r == &ioport_resource || r == &iomem_resource)
@@ -813,7 +812,8 @@ static void pbus_size_io(struct pci_bus
resource_size_t add_size, struct list_head *realloc_head)
{
struct pci_dev *dev;
- struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
+ struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO,
+ IORESOURCE_IO);
resource_size_t size = 0, size0 = 0, size1 = 0;
resource_size_t children_add_size = 0;
resource_size_t min_align, align;
@@ -913,15 +913,16 @@ static inline resource_size_t calculate_
* guarantees that all child resources fit in this size.
*/
static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
- unsigned long type, resource_size_t min_size,
- resource_size_t add_size,
- struct list_head *realloc_head)
+ unsigned long type, unsigned long type2,
+ resource_size_t min_size, resource_size_t add_size,
+ struct list_head *realloc_head)
{
struct pci_dev *dev;
resource_size_t min_align, align, size, size0, size1;
resource_size_t aligns[12]; /* Alignments from 1Mb to 2Gb */
int order, max_order;
- struct resource *b_res = find_free_bus_resource(bus, type);
+ struct resource *b_res = find_free_bus_resource(bus,
+ mask | IORESOURCE_PREFETCH, type);
unsigned int mem64_mask = 0;
resource_size_t children_add_size = 0;
@@ -942,7 +943,8 @@ static int pbus_size_mem(struct pci_bus
struct resource *r = &dev->resource[i];
resource_size_t r_size;
- if (r->parent || (r->flags & mask) != type)
+ if (r->parent || ((r->flags & mask) != type &&
+ (r->flags & mask) != type2))
continue;
r_size = resource_size(r);
#ifdef CONFIG_PCI_IOV
@@ -1115,8 +1117,9 @@ void __ref __pci_bus_size_bridges(struct
struct list_head *realloc_head)
{
struct pci_dev *dev;
- unsigned long mask, prefmask;
+ unsigned long mask, prefmask, type2 = 0;
resource_size_t additional_mem_size = 0, additional_io_size = 0;
+ struct resource *b_res;
list_for_each_entry(dev, &bus->devices, bus_list) {
struct pci_bus *b = dev->subordinate;
@@ -1161,15 +1164,31 @@ void __ref __pci_bus_size_bridges(struct
has already been allocated by arch code, try
non-prefetchable range for both types of PCI memory
resources. */
+ b_res = &bus->self->resource[PCI_BRIDGE_RESOURCES];
mask = IORESOURCE_MEM;
prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
- if (pbus_size_mem(bus, prefmask, prefmask,
+ if (b_res[2].flags & IORESOURCE_MEM_64) {
+ prefmask |= IORESOURCE_MEM_64;
+ if (pbus_size_mem(bus, prefmask, prefmask, prefmask,
realloc_head ? 0 : additional_mem_size,
- additional_mem_size, realloc_head))
- mask = prefmask; /* Success, size non-prefetch only. */
- else
- additional_mem_size += additional_mem_size;
- pbus_size_mem(bus, mask, IORESOURCE_MEM,
+ additional_mem_size, realloc_head)) {
+ /* Success, size non-pref64 only. */
+ mask = prefmask;
+ type2 = prefmask & ~IORESOURCE_MEM_64;
+ }
+ }
+ if (!type2) {
+ prefmask &= ~IORESOURCE_MEM_64;
+ if (pbus_size_mem(bus, prefmask, prefmask, prefmask,
+ realloc_head ? 0 : additional_mem_size,
+ additional_mem_size, realloc_head)) {
+ /* Success, size non-prefetch only. */
+ mask = prefmask;
+ } else
+ additional_mem_size += additional_mem_size;
+ type2 = IORESOURCE_MEM;
+ }
+ pbus_size_mem(bus, mask, IORESOURCE_MEM, type2,
realloc_head ? 0 : additional_mem_size,
additional_mem_size, realloc_head);
break;
@@ -1255,42 +1274,66 @@ static void __ref __pci_bridge_assign_re
static void pci_bridge_release_resources(struct pci_bus *bus,
unsigned long type)
{
- int idx;
- bool changed = false;
- struct pci_dev *dev;
+ struct pci_dev *dev = bus->self;
struct resource *r;
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
- IORESOURCE_PREFETCH;
+ IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
+ unsigned old_flags = 0;
+ struct resource *b_res;
+ int idx = 1;
- dev = bus->self;
- for (idx = PCI_BRIDGE_RESOURCES; idx <= PCI_BRIDGE_RESOURCE_END;
- idx++) {
- r = &dev->resource[idx];
- if ((r->flags & type_mask) != type)
- continue;
- if (!r->parent)
- continue;
- /*
- * if there are children under that, we should release them
- * all
- */
- release_child_resources(r);
- if (!release_resource(r)) {
- dev_printk(KERN_DEBUG, &dev->dev,
- "resource %d %pR released\n", idx, r);
- /* keep the old size */
- r->end = resource_size(r) - 1;
- r->start = 0;
- r->flags = 0;
- changed = true;
- }
- }
+ b_res = &dev->resource[PCI_BRIDGE_RESOURCES];
+
+ /*
+ * 1. if there is io port assign fail, will release bridge
+ * io port.
+ * 2. if there is non pref mmio assign fail, release bridge
+ * nonpref mmio.
+ * 3. if there is 64bit pref mmio assign fail, and bridge pref
+ * is 64bit, release bridge pref mmio.
+ * 4. if there is pref mmio assign fail, and bridge pref is
+ * 32bit mmio, release bridge pref mmio
+ * 5. if there is pref mmio assign fail, and bridge pref is not
+ * assigned, release bridge nonpref mmio.
+ */
+ if (type & IORESOURCE_IO)
+ idx = 0;
+ else if (!(type & IORESOURCE_PREFETCH))
+ idx = 1;
+ else if ((type & IORESOURCE_MEM_64) &&
+ (b_res[2].flags & IORESOURCE_MEM_64))
+ idx = 2;
+ else if (!(b_res[2].flags & IORESOURCE_MEM_64) &&
+ (b_res[2].flags & IORESOURCE_PREFETCH))
+ idx = 2;
+ else
+ idx = 1;
+
+ r = &b_res[idx];
+
+ if (!r->parent)
+ return;
+
+ /*
+ * if there are children under that, we should release them
+ * all
+ */
+ release_child_resources(r);
+ if (!release_resource(r)) {
+ type = old_flags = r->flags & type_mask;
+ dev_printk(KERN_DEBUG, &dev->dev, "resource %d %pR released\n",
+ PCI_BRIDGE_RESOURCES + idx, r);
+ /* keep the old size */
+ r->end = resource_size(r) - 1;
+ r->start = 0;
+ r->flags = 0;
- if (changed) {
/* avoiding touch the one without PREF */
if (type & IORESOURCE_PREFETCH)
type = IORESOURCE_PREFETCH;
__pci_setup_bridge(bus, type);
+ /* for next child res under same bridge */
+ r->flags = old_flags;
}
}
@@ -1469,7 +1512,7 @@ void pci_assign_unassigned_root_bus_reso
LIST_HEAD(fail_head);
struct pci_dev_resource *fail_res;
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
- IORESOURCE_PREFETCH;
+ IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
int pci_try_num = 1;
enum enable_type enable_local;
Index: linux-2.6/drivers/pci/setup-res.c
===================================================================
--- linux-2.6.orig/drivers/pci/setup-res.c
+++ linux-2.6/drivers/pci/setup-res.c
@@ -208,9 +208,21 @@ static int __pci_assign_resource(struct
/* First, try exact prefetching match.. */
ret = pci_bus_alloc_resource(bus, res, size, align, min,
- IORESOURCE_PREFETCH,
+ IORESOURCE_PREFETCH | IORESOURCE_MEM_64,
pcibios_align_resource, dev);
+ if (ret < 0 &&
+ (res->flags & (IORESOURCE_PREFETCH | IORESOURCE_MEM_64))) {
+ /*
+ * That failed.
+ *
+ * Try below 4g pref
+ */
+ ret = pci_bus_alloc_resource(bus, res, size, align, min,
+ IORESOURCE_PREFETCH,
+ pcibios_align_resource, dev);
+ }
+
if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
/*
* That failed.
