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Date: Mon, 1 Sep 2008 10:15:34 -0600
From: Alex Chiang <achiang@...com>
To: "Zhao, Yu" <yu.zhao@...el.com>
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>, linux-pci@...r.kernel.org,
Randy Dunlap <randy.dunlap@...cle.com>,
Greg KH <greg@...ah.com>,
Grant Grundler <grundler@...isc-linux.org>,
Matthew Wilcox <matthew@....cx>, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
xen-devel@...ts.xensource.com
Subject: Re: [PATCH 1/4 v2] PCI: introduce new base functions
* Zhao, Yu <yu.zhao@...el.com>:
> Some basic changes to allocation bus range, MMIO resource for SR-IOV device.
This following comment is a bit confusing:
> And add new sysfs entry to hotplug core to pass parameter to a
> slot, which will be used by SR-IOV code.
I was reading this patch, expecting to see a change to the
hotplug core _API_ taking a param, not just a new sysfs entry.
I would suggest rewording this part of the changelog as:
Add new sysfs file 'param' to /sys/bus/pci/slots/.../
which allows the user to pass a parameter to a slot. This
parameter will be used by the SR-IOV code.
More about this new 'param' file below.
>
> Signed-off-by: Yu Zhao <yu.zhao@...el.com>
> Signed-off-by: Eddie Dong <eddie.dong@...el.com>
>
> ---
> drivers/pci/bus.c | 63 +++++++++++++-------------
> drivers/pci/hotplug/pci_hotplug_core.c | 75 +++++++++++++++++++++++++++++---
> drivers/pci/pci-sysfs.c | 4 +-
> drivers/pci/pci.c | 68 +++++++++++++++++++++--------
> drivers/pci/pci.h | 3 +
> drivers/pci/probe.c | 37 ++++++++-------
> drivers/pci/proc.c | 7 ++-
> drivers/pci/remove.c | 3 +-
> drivers/pci/setup-bus.c | 9 ++--
> drivers/pci/setup-res.c | 29 ++++++------
> include/linux/pci.h | 53 ++++++++++++++++-------
> include/linux/pci_hotplug.h | 11 ++++-
> 12 files changed, 246 insertions(+), 116 deletions(-)
>
> diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
> index 529d9d7..15f64c9 100644
> --- a/drivers/pci/bus.c
> +++ b/drivers/pci/bus.c
> @@ -105,7 +105,7 @@ int pci_bus_add_device(struct pci_dev *dev)
> void pci_bus_add_devices(struct pci_bus *bus)
> {
> struct pci_dev *dev;
> - struct pci_bus *child_bus;
> + struct pci_bus *child;
> int retval;
>
> list_for_each_entry(dev, &bus->devices, bus_list) {
> @@ -115,43 +115,42 @@ void pci_bus_add_devices(struct pci_bus *bus)
> retval = pci_bus_add_device(dev);
> if (retval)
> dev_err(&dev->dev, "Error adding device, continuing\n");
> - }
> -
> - list_for_each_entry(dev, &bus->devices, bus_list) {
> - BUG_ON(!dev->is_added);
>
> /*
> * If there is an unattached subordinate bus, attach
> * it and then scan for unattached PCI devices.
> */
> - if (dev->subordinate) {
> - if (list_empty(&dev->subordinate->node)) {
> - down_write(&pci_bus_sem);
> - list_add_tail(&dev->subordinate->node,
> - &dev->bus->children);
> - up_write(&pci_bus_sem);
> - }
> - pci_bus_add_devices(dev->subordinate);
> -
> - /* register the bus with sysfs as the parent is now
> - * properly registered. */
> - child_bus = dev->subordinate;
> - if (child_bus->is_added)
> - continue;
> - child_bus->dev.parent = child_bus->bridge;
> - retval = device_register(&child_bus->dev);
> - if (retval)
> - dev_err(&dev->dev, "Error registering pci_bus,"
> - " continuing...\n");
> - else {
> - child_bus->is_added = 1;
> - retval = device_create_file(&child_bus->dev,
> - &dev_attr_cpuaffinity);
> - }
> - if (retval)
> - dev_err(&dev->dev, "Error creating cpuaffinity"
> - " file, continuing...\n");
> + if (!dev->subordinate)
> + continue;
> +
> + if (list_empty(&dev->subordinate->node)) {
> + down_write(&pci_bus_sem);
> + list_add_tail(&dev->subordinate->node,
> + &dev->bus->children);
> + up_write(&pci_bus_sem);
> }
> + pci_bus_add_devices(dev->subordinate);
> + }
> +
> + list_for_each_entry(child, &bus->children, node) {
> + /* register the bus with sysfs as the parent is now
> + * properly registered. */
> + if (child->is_added)
> + continue;
> + if (child->bridge)
> + child->dev.parent = child->bridge;
> + retval = device_register(&child->dev);
> + if (retval) {
> + dev_err(&dev->dev, "Error registering pci_bus,"
> + " continuing...\n");
Please break the 80-column "rule" and make this all one line, to
help with greppability.
I know the prior version had it broken across two lines too, but
we can improve it now. :)
> + continue;
> + }
> + child->is_added = 1;
> + retval = device_create_file(&child->dev,
> + &dev_attr_cpuaffinity);
> + if (retval)
> + dev_err(&dev->dev, "Error creating cpuaffinity"
> + " file, continuing...\n");
This one too, please.
> }
> }
>
> diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c
> index 5f85b1b..96f99c7 100644
> --- a/drivers/pci/hotplug/pci_hotplug_core.c
> +++ b/drivers/pci/hotplug/pci_hotplug_core.c
> @@ -102,13 +102,13 @@ static int get_##name (struct hotplug_slot *slot, type *value) \
> { \
> struct hotplug_slot_ops *ops = slot->ops; \
> int retval = 0; \
> - if (try_module_get(ops->owner)) { \
> - if (ops->get_##name) \
> - retval = ops->get_##name(slot, value); \
> - else \
> - *value = slot->info->name; \
> - module_put(ops->owner); \
> - } \
> + if (!try_module_get(ops->owner)) \
> + return -ENODEV; \
> + if (ops->get_##name) \
> + retval = ops->get_##name(slot, value); \
> + else \
> + *value = slot->info->name; \
> + module_put(ops->owner); \
> return retval; \
> }
>
> @@ -118,6 +118,7 @@ GET_STATUS(latch_status, u8)
> GET_STATUS(adapter_status, u8)
> GET_STATUS(max_bus_speed, enum pci_bus_speed)
> GET_STATUS(cur_bus_speed, enum pci_bus_speed)
> +GET_STATUS(param, const char *)
So is this new file only used for SR-IOV? Or do you imagine it to
be general-purpose in the future? If SR-IOV only, then I suggest
a different name other than 'param', since that's a very generic
name for a very specific feature.
If you do imagine 'param' to be generally useful, then ignore
this comment. ;)
> static ssize_t power_read_file(struct pci_slot *slot, char *buf)
> {
> @@ -346,6 +347,41 @@ static struct pci_slot_attribute hotplug_slot_attr_test = {
> .store = test_write_file
> };
>
> +static ssize_t param_read_file(struct pci_slot *slot, char *buf)
> +{
> + int retval;
> + const char *param;
> +
> + retval = get_param(slot->hotplug, ¶m);
> + if (retval)
> + return retval;
> +
> + return param ? snprintf(buf, PAGE_SIZE, "%s\n", param) : -EPERM;
> +}
> +
> +static ssize_t param_write_file(struct pci_slot *slot, const char *buf,
> + size_t count)
> +{
> + int retval = -EPERM;
> + struct hotplug_slot_ops *ops = slot->hotplug->ops;
> +
> + if (!try_module_get(ops->owner))
> + return -ENODEV;
> +
> + if (ops->set_param)
> + retval = ops->set_param(slot->hotplug, buf, count);
> +
> + module_put(ops->owner);
> +
> + return retval ? retval : count;
> +}
> +
> +static struct pci_slot_attribute hotplug_slot_attr_param = {
> + .attr = {.name = "param", .mode = S_IFREG | S_IRUGO | S_IWUSR},
> + .show = param_read_file,
> + .store = param_write_file
> +};
> +
> static int has_power_file(struct pci_slot *pci_slot)
> {
> struct hotplug_slot *slot = pci_slot->hotplug;
> @@ -419,6 +455,17 @@ static int has_test_file(struct pci_slot *pci_slot)
> return -ENOENT;
> }
>
> +static int has_param_file(struct pci_slot *pci_slot)
> +{
> + struct hotplug_slot *slot = pci_slot->hotplug;
> + if ((!slot) || (!slot->ops))
> + return -ENODEV;
> + if ((slot->ops->set_param) ||
> + (slot->ops->get_param))
> + return 0;
CodingStyle?
if (slot->ops->set_param || slot->ops->get_param)
return 0;
Seems slightly more readable to me, but it's just a suggestion;
feel free to ignore.
I guess this comment applies to the above line too; you don't
need all those parens around (!slot), etc.
> + return -ENOENT;
> +}
> +
> static int fs_add_slot(struct pci_slot *slot)
> {
> int retval = 0;
> @@ -471,8 +518,19 @@ static int fs_add_slot(struct pci_slot *slot)
> goto exit_test;
> }
>
> + if (has_param_file(slot) == 0) {
> + retval = sysfs_create_file(&slot->kobj,
> + &hotplug_slot_attr_param.attr);
> + if (retval)
> + goto exit_param;
> + }
> +
> goto exit;
>
> +exit_param:
> + if (has_param_file(slot) == 0)
> + sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_param.attr);
> +
> exit_test:
> if (has_cur_bus_speed_file(slot) == 0)
> sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
> @@ -523,6 +581,9 @@ static void fs_remove_slot(struct pci_slot *slot)
>
> if (has_test_file(slot) == 0)
> sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
> +
> + if (has_param_file(slot) == 0)
> + sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_param.attr);
> }
>
> static struct hotplug_slot *get_slot_from_name (const char *name)
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index 9c71858..f466937 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -100,11 +100,13 @@ resource_show(struct device * dev, struct device_attribute *attr, char * buf)
> struct pci_dev * pci_dev = to_pci_dev(dev);
> char * str = buf;
> int i;
> - int max = 7;
> + int max;
> resource_size_t start, end;
>
> if (pci_dev->subordinate)
> max = DEVICE_COUNT_RESOURCE;
> + else
> + max = PCI_BRIDGE_RESOURCES;
>
> for (i = 0; i < max; i++) {
> struct resource *res = &pci_dev->resource[i];
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index c9884bb..c1108ed 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -356,25 +356,10 @@ pci_find_parent_resource(const struct pci_dev *dev, struct resource *res)
> static void
> pci_restore_bars(struct pci_dev *dev)
> {
> - int i, numres;
> -
> - switch (dev->hdr_type) {
> - case PCI_HEADER_TYPE_NORMAL:
> - numres = 6;
> - break;
> - case PCI_HEADER_TYPE_BRIDGE:
> - numres = 2;
> - break;
> - case PCI_HEADER_TYPE_CARDBUS:
> - numres = 1;
> - break;
> - default:
> - /* Should never get here, but just in case... */
> - return;
> - }
> + int i;
>
> - for (i = 0; i < numres; i ++)
> - pci_update_resource(dev, &dev->resource[i], i);
> + for (i = 0; i < PCI_BRIDGE_RESOURCES; i++)
> + pci_update_resource(dev, i);
> }
>
> static struct pci_platform_pm_ops *pci_platform_pm;
> @@ -1864,6 +1849,53 @@ int pci_select_bars(struct pci_dev *dev, unsigned long flags)
> return bars;
> }
>
> +/**
> + * pci_resource_alignment - get a PCI BAR resource alignment
> + * @dev: the PCI device
> + * @resno: the resource number
> + *
> + * Returns alignment size on success, or 0 on error.
> + */
> +int pci_resource_alignment(struct pci_dev *dev, int resno)
> +{
> + resource_size_t align;
> + struct resource *res = dev->resource + resno;
> +
> + align = resource_alignment(res);
> + if (align)
> + return align;
> +
> + if (resno <= PCI_ROM_RESOURCE)
> + return resource_size(res);
> + else if (resno <= PCI_BRIDGE_RES_END)
> + return res->start;
> +
> + dev_err(&dev->dev, "alignment: invalid resource #: %d\n", resno);
> + return 0;
> +}
> +
> +/**
> + * pci_resource_bar - get position of the BAR associated with a resource
> + * @dev: the PCI device
> + * @resno: the resource number
> + * @type: the BAR type to be filled in
> + *
> + * Returns BAR position in config space, or 0 if the BAR is invalid.
> + */
> +int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type)
> +{
> + if (resno < PCI_ROM_RESOURCE) {
> + *type = pci_bar_unknown;
> + return PCI_BASE_ADDRESS_0 + 4 * resno;
> + } else if (resno == PCI_ROM_RESOURCE) {
> + *type = pci_bar_rom;
> + return dev->rom_base_reg;
> + }
> +
> + dev_err(&dev->dev, "BAR: invalid resource #: %d\n", resno);
> + return 0;
> +}
> +
> static void __devinit pci_no_domains(void)
> {
> #ifdef CONFIG_PCI_DOMAINS
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index d807cd7..5abd69c 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -144,3 +144,6 @@ struct pci_slot_attribute {
> };
> #define to_pci_slot_attr(s) container_of(s, struct pci_slot_attribute, attr)
>
> +extern int pci_resource_alignment(struct pci_dev *dev, int resno);
> +extern int pci_resource_bar(struct pci_dev *dev, int resno,
> + enum pci_bar_type *type);
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index cce2f4c..3994ea3 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -203,13 +203,6 @@ static u64 pci_size(u64 base, u64 maxbase, u64 mask)
> return size;
> }
>
> -enum pci_bar_type {
> - pci_bar_unknown, /* Standard PCI BAR probe */
> - pci_bar_io, /* An io port BAR */
> - pci_bar_mem32, /* A 32-bit memory BAR */
> - pci_bar_mem64, /* A 64-bit memory BAR */
> -};
> -
> static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
> {
> if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
> @@ -224,16 +217,21 @@ static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
> return pci_bar_mem32;
> }
>
> -/*
> - * If the type is not unknown, we assume that the lowest bit is 'enable'.
> - * Returns 1 if the BAR was 64-bit and 0 if it was 32-bit.
> +/**
> + * pci_read_base - read a PCI BAR
> + * @dev: the PCI device
> + * @type: type of the BAR
> + * @res: resource buffer to be filled in
> + * @pos: BAR position in the config space
> + *
> + * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
> */
> -static int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
> +int pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
> struct resource *res, unsigned int pos)
> {
> u32 l, sz, mask;
>
> - mask = type ? ~PCI_ROM_ADDRESS_ENABLE : ~0;
> + mask = (type == pci_bar_rom) ? ~PCI_ROM_ADDRESS_ENABLE : ~0;
>
> res->name = pci_name(dev);
>
> @@ -258,7 +256,7 @@ static int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
> if (l == 0xffffffff)
> l = 0;
>
> - if (type == pci_bar_unknown) {
> + if (type != pci_bar_rom) {
> type = decode_bar(res, l);
> res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
> if (type == pci_bar_io) {
> @@ -321,6 +319,7 @@ static int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
> res->flags = 0;
> goto out;
> }
> +EXPORT_SYMBOL_GPL(pci_read_base);
>
> static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
> {
> @@ -329,7 +328,7 @@ static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
> for (pos = 0; pos < howmany; pos++) {
> struct resource *res = &dev->resource[pos];
> reg = PCI_BASE_ADDRESS_0 + (pos << 2);
> - pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
> + pos += pci_read_base(dev, pci_bar_unknown, res, reg);
> }
>
> if (rom) {
> @@ -338,7 +337,7 @@ static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
> res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
> IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
> IORESOURCE_SIZEALIGN;
> - __pci_read_base(dev, pci_bar_mem32, res, rom);
> + pci_read_base(dev, pci_bar_rom, res, rom);
> }
> }
>
> @@ -462,12 +461,10 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
> if (!child)
> return NULL;
>
> - child->self = bridge;
> child->parent = parent;
> child->ops = parent->ops;
> child->sysdata = parent->sysdata;
> child->bus_flags = parent->bus_flags;
> - child->bridge = get_device(&bridge->dev);
>
> /* initialize some portions of the bus device, but don't register it
> * now as the parent is not properly set up yet. This device will get
> @@ -484,6 +481,11 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
> child->primary = parent->secondary;
> child->subordinate = 0xff;
>
> + if (!bridge)
> + goto done;
> +
> + child->self = bridge;
> + child->bridge = get_device(&bridge->dev);
> /* Set up default resource pointers and names.. */
> for (i = 0; i < 4; i++) {
> child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
> @@ -491,6 +493,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
> }
> bridge->subordinate = child;
>
> +done:
> return child;
> }
>
> diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
> index e1098c3..f6f2a59 100644
> --- a/drivers/pci/proc.c
> +++ b/drivers/pci/proc.c
> @@ -352,15 +352,16 @@ static int show_device(struct seq_file *m, void *v)
> dev->vendor,
> dev->device,
> dev->irq);
> - /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
> - for (i=0; i<7; i++) {
> +
> + /* only print standard and ROM resources to preserve compatibility */
> + for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
Why not:
for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
Looks like the tradeoff is explicit mention of PCI_ROM_RESOURCE
vs using a non-standard C idiom (personally, I'm not a huge fan
of <= in a for loop, but ymmv).
Again, this is a minor nit, feel free to ignore.
> resource_size_t start, end;
> pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
> seq_printf(m, "\t%16llx",
> (unsigned long long)(start |
> (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
> }
> - for (i=0; i<7; i++) {
> + for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
Same comment as above.
> resource_size_t start, end;
> pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
> seq_printf(m, "\t%16llx",
> diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
> index bdc2a44..3501068 100644
> --- a/drivers/pci/remove.c
> +++ b/drivers/pci/remove.c
> @@ -73,7 +73,8 @@ void pci_remove_bus(struct pci_bus *pci_bus)
> up_write(&pci_bus_sem);
> pci_remove_legacy_files(pci_bus);
> device_remove_file(&pci_bus->dev, &dev_attr_cpuaffinity);
> - device_unregister(&pci_bus->dev);
> + if (pci_bus->is_added)
> + device_unregister(&pci_bus->dev);
> }
> EXPORT_SYMBOL(pci_remove_bus);
>
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index 82634a2..78f2f16 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -26,6 +26,8 @@
> #include <linux/cache.h>
> #include <linux/slab.h>
>
> +#include "pci.h"
> +
Stray newline above the #include statement?
> static void pbus_assign_resources_sorted(struct pci_bus *bus)
> {
> @@ -299,7 +301,7 @@ static void pbus_size_io(struct pci_bus *bus)
>
> if (r->parent || !(r->flags & IORESOURCE_IO))
> continue;
> - r_size = r->end - r->start + 1;
> + r_size = resource_size(r);
>
> if (r_size < 0x400)
> /* Might be re-aligned for ISA */
> @@ -350,9 +352,8 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long
>
> if (r->parent || (r->flags & mask) != type)
> continue;
> - r_size = r->end - r->start + 1;
> - /* For bridges size != alignment */
> - align = (i < PCI_BRIDGE_RESOURCES) ? r_size : r->start;
> + r_size = resource_size(r);
> + align = pci_resource_alignment(dev, i);
> order = __ffs(align) - 20;
> if (order > 11) {
> dev_warn(&dev->dev, "BAR %d too large: "
> diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
> index 1a5fc83..b6bb1ad 100644
> --- a/drivers/pci/setup-res.c
> +++ b/drivers/pci/setup-res.c
> @@ -26,11 +26,13 @@
> #include "pci.h"
>
>
> -void pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
> +void pci_update_resource(struct pci_dev *dev, int resno)
> {
> struct pci_bus_region region;
> u32 new, check, mask;
> int reg;
> + enum pci_bar_type type;
> + struct resource *res = dev->resource + resno;
>
> /*
> * Ignore resources for unimplemented BARs and unused resource slots
> @@ -63,17 +65,13 @@ void pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
> else
> mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
>
> - if (resno < 6) {
> - reg = PCI_BASE_ADDRESS_0 + 4 * resno;
> - } else if (resno == PCI_ROM_RESOURCE) {
> + reg = pci_resource_bar(dev, resno, &type);
> + if (!reg)
> + return;
> + if (type == pci_bar_rom) {
> if (!(res->flags & IORESOURCE_ROM_ENABLE))
> return;
> new |= PCI_ROM_ADDRESS_ENABLE;
> - reg = dev->rom_base_reg;
> - } else {
> - /* Hmm, non-standard resource. */
> -
> - return; /* kill uninitialised var warning */
> }
>
> pci_write_config_dword(dev, reg, new);
> @@ -133,10 +131,10 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
> resource_size_t size, min, align;
> int ret;
>
> - size = res->end - res->start + 1;
> + size = resource_size(res);
> min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
>
> - align = resource_alignment(res);
> + align = pci_resource_alignment(dev, resno);
> if (!align) {
> dev_err(&dev->dev, "BAR %d: can't allocate resource (bogus "
> "alignment) [%#llx-%#llx] flags %#lx\n",
> @@ -170,7 +168,7 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
> } else {
> res->flags &= ~IORESOURCE_STARTALIGN;
> if (resno < PCI_BRIDGE_RESOURCES)
> - pci_update_resource(dev, res, resno);
> + pci_update_resource(dev, resno);
> }
>
> return ret;
> @@ -208,7 +206,7 @@ int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
> (unsigned long long)res->start,
> (unsigned long long)res->end);
> } else if (resno < PCI_BRIDGE_RESOURCES) {
> - pci_update_resource(dev, res, resno);
> + pci_update_resource(dev, resno);
> }
>
> return ret;
> @@ -234,7 +232,7 @@ void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
> if (!(r->flags) || r->parent)
> continue;
>
> - r_align = resource_alignment(r);
> + r_align = pci_resource_alignment(dev, i);
> if (!r_align) {
> dev_warn(&dev->dev, "BAR %d: bogus alignment "
> "[%#llx-%#llx] flags %#lx\n",
> @@ -247,7 +245,8 @@ void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
> struct resource_list *ln = list->next;
>
> if (ln)
> - align = resource_alignment(ln->res);
> + align = pci_resource_alignment(ln->dev,
> + ln->res - ln->dev->resource);
>
> if (r_align > align) {
> tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index c0e1400..687be00 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -76,7 +76,29 @@ enum pci_mmap_state {
> #define PCI_DMA_FROMDEVICE 2
> #define PCI_DMA_NONE 3
>
> -#define DEVICE_COUNT_RESOURCE 12
> +/*
> + * For PCI devices, the region numbers are assigned this way:
> + */
> +enum {
> + /* 0-5 standard PCI regions */
> + PCI_STD_RESOURCE,
> +
> + /* expansion ROM */
> + PCI_ROM_RESOURCE = 6,
> +
> + /* address space assigned to buses behind the bridge */
> +#ifndef PCI_BRIDGE_NUM_RES
> +#define PCI_BRIDGE_NUM_RES 4
> +#endif
> + PCI_BRIDGE_RESOURCES,
> + PCI_BRIDGE_RES_END = PCI_BRIDGE_RESOURCES + PCI_BRIDGE_NUM_RES - 1,
> +
> + /* total resources associated with a PCI device */
> + PCI_NUM_RESOURCES,
> +
> + /* preserve this for compatibility */
> + DEVICE_COUNT_RESOURCE
> +};
Ouch, this enum makes my head hurt a little. Care to put in a
comment for PCI_BRIDGE_RES_END, saying that it has a value of 10?
Thanks,
/ac
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