Re: [tip:x86/apic] x86, PCI, ACPI: Kill private function resource_to_addr() in arch/x86/pci/acpi.c

From: Jiang Liu
Date: Wed Dec 10 2014 - 08:37:36 EST

Hi Yinghai,
I have one comment about the attached patch related to
following piece of code. I'm not sure whether we should check
"addr.maximum - addr.minimum + 1 != addr.address_length"
instead of "!addr.address_length". Otherwise:

Reviewed-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Regards!
Gerry

Index: linux-2.6/drivers/acpi/resource.c
===================================================================
--- linux-2.6.orig/drivers/acpi/resource.c
+++ linux-2.6/drivers/acpi/resource.c
@@ -199,7 +199,7 @@ bool acpi_dev_resource_address_space(str
}

status = acpi_resource_to_address64(ares, &addr);
- if (ACPI_FAILURE(status))
+ if (ACPI_FAILURE(status) || !addr.address_length)
return false;

res->start = addr.minimum;

On 2014/12/10 12:08, Yinghai Lu wrote:
> On Mon, Nov 3, 2014 at 2:57 AM, tip-bot for Jiang Liu <tipbot@xxxxxxxxx> wrote:
>> Commit-ID: e22ce93870deae0e9a54e1539f0088538f187780
>> Gitweb: http://git.kernel.org/tip/e22ce93870deae0e9a54e1539f0088538f187780
>> Author: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
>> AuthorDate: Mon, 27 Oct 2014 13:21:34 +0800
>> Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
>> CommitDate: Mon, 3 Nov 2014 11:56:07 +0100
>>
>> x86, PCI, ACPI: Kill private function resource_to_addr() in arch/x86/pci/acpi.c
>>
>> Private function resource_to_addr() is used to parse ACPI resources
>> for PCI host bridge. There are public interfaces available for that
>> purpose, so replace resource_to_addr() with public interfaces.
>>
>> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
>> Reviewed-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
>> Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
>> Cc: Tony Luck <tony.luck@xxxxxxxxx>
>> Cc: Joerg Roedel <joro@xxxxxxxxxx>
>> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
>> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
>> Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
>> Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
>> Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
>> Cc: Borislav Petkov <bp@xxxxxxxxx>
>> Link: http://lkml.kernel.org/r/1414387308-27148-5-git-send-email-jiang.liu@xxxxxxxxxxxxxxx
>> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
>> ---
>> arch/x86/pci/acpi.c | 144 +++++++++++++++++++---------------------------------
>> 1 file changed, 53 insertions(+), 91 deletions(-)
>>
>> diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
>> index cfd1b13..3f72d93 100644
>> --- a/arch/x86/pci/acpi.c
>> +++ b/arch/x86/pci/acpi.c
>> @@ -218,114 +218,76 @@ static void teardown_mcfg_map(struct pci_root_info *info)
>> }
>> #endif
>>
>> -static acpi_status resource_to_addr(struct acpi_resource *resource,
>> - struct acpi_resource_address64 *addr)
>> -{
>> - acpi_status status;
>> - struct acpi_resource_memory24 *memory24;
>> - struct acpi_resource_memory32 *memory32;
>> - struct acpi_resource_fixed_memory32 *fixed_memory32;
>> -
>> - memset(addr, 0, sizeof(*addr));
>> - switch (resource->type) {
>> - case ACPI_RESOURCE_TYPE_MEMORY24:
>> - memory24 = &resource->data.memory24;
>> - addr->resource_type = ACPI_MEMORY_RANGE;
>> - addr->minimum = memory24->minimum;
>> - addr->address_length = memory24->address_length;
>> - addr->maximum = addr->minimum + addr->address_length - 1;
>> - return AE_OK;
>> - case ACPI_RESOURCE_TYPE_MEMORY32:
>> - memory32 = &resource->data.memory32;
>> - addr->resource_type = ACPI_MEMORY_RANGE;
>> - addr->minimum = memory32->minimum;
>> - addr->address_length = memory32->address_length;
>> - addr->maximum = addr->minimum + addr->address_length - 1;
>> - return AE_OK;
>> - case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
>> - fixed_memory32 = &resource->data.fixed_memory32;
>> - addr->resource_type = ACPI_MEMORY_RANGE;
>> - addr->minimum = fixed_memory32->address;
>> - addr->address_length = fixed_memory32->address_length;
>> - addr->maximum = addr->minimum + addr->address_length - 1;
>> - return AE_OK;
>> - case ACPI_RESOURCE_TYPE_ADDRESS16:
>> - case ACPI_RESOURCE_TYPE_ADDRESS32:
>> - case ACPI_RESOURCE_TYPE_ADDRESS64:
>> - status = acpi_resource_to_address64(resource, addr);
>> - if (ACPI_SUCCESS(status) &&
>> - (addr->resource_type == ACPI_MEMORY_RANGE ||
>> - addr->resource_type == ACPI_IO_RANGE) &&
>> - addr->address_length > 0) {
>> - return AE_OK;
>> - }
>> - break;
>> - }
>> - return AE_ERROR;
>> -}
>> -
>> static acpi_status count_resource(struct acpi_resource *acpi_res, void *data)
>> {
>> struct pci_root_info *info = data;
>> - struct acpi_resource_address64 addr;
>> - acpi_status status;
>> + struct resource r = {
>> + .flags = 0
>> + };
>>
>> - status = resource_to_addr(acpi_res, &addr);
>> - if (ACPI_SUCCESS(status))
>> + if (!acpi_dev_resource_memory(acpi_res, &r) &&
>> + !acpi_dev_resource_address_space(acpi_res, &r))
>> + return AE_OK;
>> +
>> + if ((r.flags & (IORESOURCE_IO | IORESOURCE_MEM)) && resource_size(&r))
>> info->res_num++;
>> +
>> return AE_OK;
>> }
>>
>> static acpi_status setup_resource(struct acpi_resource *acpi_res, void *data)
>> {
>> struct pci_root_info *info = data;
>> - struct resource *res;
>> - struct acpi_resource_address64 addr;
>> - acpi_status status;
>> - unsigned long flags;
>> - u64 start, orig_end, end;
>> + u64 translation_offset = 0;
>> + struct resource r = {
>> + .flags = 0
>> + };
>> +
>> + if (acpi_dev_resource_memory(acpi_res, &r)) {
>> + r.flags &= IORESOURCE_MEM | IORESOURCE_IO;
>> + } else if (acpi_dev_resource_address_space(acpi_res, &r)) {
>> + u64 orig_end;
>> + struct acpi_resource_address64 addr;
>> +
>> + r.flags &= IORESOURCE_MEM | IORESOURCE_IO;
>> + if (r.flags == 0)
>> + return AE_OK;
>>
>> - status = resource_to_addr(acpi_res, &addr);
>> - if (!ACPI_SUCCESS(status))
>> - return AE_OK;
>> + if (ACPI_FAILURE(acpi_resource_to_address64(acpi_res, &addr)))
>> + return AE_OK;
>>
>> - if (addr.resource_type == ACPI_MEMORY_RANGE) {
>> - flags = IORESOURCE_MEM;
>> - if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
>> - flags |= IORESOURCE_PREFETCH;
>> - } else if (addr.resource_type == ACPI_IO_RANGE) {
>> - flags = IORESOURCE_IO;
>> - } else
>> - return AE_OK;
>> + if (addr.resource_type == ACPI_MEMORY_RANGE &&
>> + addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
>> + r.flags |= IORESOURCE_PREFETCH;
>>
>> - start = addr.minimum + addr.translation_offset;
>> - orig_end = end = addr.maximum + addr.translation_offset;
>> + translation_offset = addr.translation_offset;
>> + orig_end = r.end;
>> + r.start += translation_offset;
>> + r.end += translation_offset;
>>
>> - /* Exclude non-addressable range or non-addressable portion of range */
>> - end = min(end, (u64)iomem_resource.end);
>> - if (end <= start) {
>> - dev_info(&info->bridge->dev,
>> - "host bridge window [%#llx-%#llx] "
>> - "(ignored, not CPU addressable)\n", start, orig_end);
>> - return AE_OK;
>> - } else if (orig_end != end) {
>> - dev_info(&info->bridge->dev,
>> - "host bridge window [%#llx-%#llx] "
>> - "([%#llx-%#llx] ignored, not CPU addressable)\n",
>> - start, orig_end, end + 1, orig_end);
>> + /* Exclude non-addressable range or non-addressable portion of range */
>> + r.end = min(r.end, iomem_resource.end);
>> + if (r.end <= r.start) {
>> + dev_info(&info->bridge->dev,
>> + "host bridge window [%#llx-%#llx] (ignored, not CPU addressable)\n",
>> + r.start, orig_end);
>> + return AE_OK;
>> + } else if (orig_end != r.end) {
>> + dev_info(&info->bridge->dev,
>> + "host bridge window [%#llx-%#llx] ([%#llx-%#llx] ignored, not CPU addressable)\n",
>> + r.start, orig_end, r.end + 1, orig_end);
>> + }
>> }
>>
>> - res = &info->res[info->res_num];
>> - res->name = info->name;
>> - res->flags = flags;
>> - res->start = start;
>> - res->end = end;
>> - info->res_offset[info->res_num] = addr.translation_offset;
>> - info->res_num++;
>> -
>> - if (!pci_use_crs)
>> - dev_printk(KERN_DEBUG, &info->bridge->dev,
>> - "host bridge window %pR (ignored)\n", res);
>> + if (r.flags && resource_size(&r)) {
>> + r.name = info->name;
>> + info->res[info->res_num] = r;
>> + info->res_offset[info->res_num] = translation_offset;
>> + info->res_num++;
>> + if (!pci_use_crs)
>> + dev_printk(KERN_DEBUG, &info->bridge->dev,
>> + "host bridge window %pR (ignored)\n", &r);
>> + }
>>
>> return AE_OK;
>> }
>
> This one cause one system with Nehalem and one with Westmere failing.
>
> [ 32.353347] acpi PNP0A08:00: host bridge window expanded to [mem
> 0x00000000-0xffffffff]; [mem 0x000a0000-0x000bffff] ignored
> [ 32.362897] acpi PNP0A08:00: host bridge window expanded to [mem
> 0x00000000-0xffffffff]; [mem 0x000d0000-0x000dffff] ignored
> [ 32.382862] acpi PNP0A08:00: host bridge window expanded to [mem
> 0x00000000-0xffffffff]; [mem 0x00000000-0xffffffff] ignored
> [ 32.402889] acpi PNP0A08:00: host bridge window expanded to [mem
> 0x00000000-0xffffffff]; [??? 0x00000000-0xffffffff flags 0x0] ignored
> [ 32.423000] acpi PNP0A08:00: host bridge window expanded to [mem
> 0x00000000-0xffffffff]; [mem 0x00000000-0xffffffff] ignored
> [ 32.602921] PCI host bridge to bus 0000:00
> [ 32.603158] pci_bus 0000:00: root bus resource [bus 00-3f]
> [ 32.622782] pci_bus 0000:00: root bus resource [io 0x0000-0x5fff]
> [ 32.642569] pci_bus 0000:00: root bus resource [mem 0x00000000-0xffffffff]
> [ 32.642893] pci_bus 0000:00: root bus resource [mem
> 0xfc000000000-0xfc07fffffff pref]
>
> Looks like the commit have several problems.
>
> Attached patch should address them.
>
> Please fix it before it get into linus tree.
>
> Thanks
>
> Yinghai
>
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