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Message-ID: <20131016231836.GC17866@google.com>
Date: Wed, 16 Oct 2013 17:18:36 -0600
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: tianyu.lan@...el.com
Cc: lenb@...nel.org, rjw@...k.pl, yinghai@...nel.org,
linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Resend PATCH 3/5] ACPI: Add new
acpi_dev_resource_address_space_full() function
On Fri, Oct 11, 2013 at 08:18:59PM +0800, tianyu.lan@...el.com wrote:
> From: Lan Tianyu <tianyu.lan@...el.com>
>
> Make acpi_dev_resource_address_space() to accept struct
> acpi_resource_address64 as param and rename it to *_full.
>
> This is for some cases that acpi address info is also needed
> after convert from acpi resouce to generic resource.
s/resouce/resource/
> Add acpi_dev_resource_addres_space() again as a wrapper of new
acpi_dev_resource_address_space() (spelled wrong above).
> function for original users.
>
> Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
> ---
> drivers/acpi/resource.c | 53 ++++++++++++++++++++++++++++++++++---------------
> include/linux/acpi.h | 3 +++
> 2 files changed, 40 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
> index 84bc3db..2e395ba 100644
> --- a/drivers/acpi/resource.c
> +++ b/drivers/acpi/resource.c
> @@ -162,19 +162,21 @@ bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
> EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
>
> /**
> - * acpi_dev_resource_address_space - Extract ACPI address space information.
> + * acpi_dev_resource_address_space_full - Extract ACPI address space information.
> * @ares: Input ACPI resource object.
> + * @addr: Output ACPI resource address64 space object.
> * @res: Output generic resource object.
> *
> * Check if the given ACPI resource object represents an address space resource
> - * and if that's the case, use the information in it to populate the generic
> - * resource object pointed to by @res.
> + * and if that's the case, convert it to ACPI resource address64 space object
> + * pointed to by @addr and use the information to populate the generic resource
> + * object pointed to by @re.
s/@re/@.../ or maybe even just use this:
"If @ares is an address space resource, convert it to an
acpi_resource_address64 and use that to populate the generic @res."
> */
> -bool acpi_dev_resource_address_space(struct acpi_resource *ares,
> +bool acpi_dev_resource_address_space_full(struct acpi_resource *ares,
> + struct acpi_resource_address64 *addr,
> struct resource *res)
> {
> acpi_status status;
> - struct acpi_resource_address64 addr;
> bool window;
> u64 len;
> u8 io_decode;
> @@ -188,29 +190,29 @@ bool acpi_dev_resource_address_space(struct acpi_resource *ares,
> return false;
> }
>
> - status = acpi_resource_to_address64(ares, &addr);
> + status = acpi_resource_to_address64(ares, addr);
> if (ACPI_FAILURE(status))
> return true;
You didn't actually change this, but it looks wrong to return "true"
here, because we haven't filled in "res". Returning "true" will cause
acpi_dev_process_resource() to call acpi_dev_new_resource_entry() with
a struct resource that's full of zeroes.
I think the best fix would be to remove this code just above:
switch (ares->type) {
case ACPI_RESOURCE_TYPE_ADDRESS16:
case ACPI_RESOURCE_TYPE_ADDRESS32:
case ACPI_RESOURCE_TYPE_ADDRESS64:
break;
default:
return false;
}
and return "false" if acpi_resource_to_address64() fails.
>
> - res->start = addr.minimum + addr.translation_offset;
> - res->end = addr.maximum + addr.translation_offset;
> - window = addr.producer_consumer == ACPI_PRODUCER;
> + res->start = addr->minimum + addr->translation_offset;
> + res->end = addr->maximum + addr->translation_offset;
> + window = addr->producer_consumer == ACPI_PRODUCER;
>
> - switch(addr.resource_type) {
> + switch (addr->resource_type) {
> case ACPI_MEMORY_RANGE:
> - len = addr.maximum - addr.minimum + 1;
> + len = addr->maximum - addr->minimum + 1;
> res->flags = acpi_dev_memresource_flags(len,
> - addr.info.mem.write_protect,
> + addr->info.mem.write_protect,
> window);
>
> - if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
> + if (addr->info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
> res->flags |= IORESOURCE_PREFETCH;
> break;
> case ACPI_IO_RANGE:
> - io_decode = addr.granularity == 0xfff ?
> + io_decode = addr->granularity == 0xfff ?
> ACPI_DECODE_10 : ACPI_DECODE_16;
> - res->flags = acpi_dev_ioresource_flags(addr.minimum,
> - addr.maximum,
> + res->flags = acpi_dev_ioresource_flags(addr->minimum,
> + addr->maximum,
> io_decode, window);
> break;
> case ACPI_BUS_NUMBER_RANGE:
> @@ -222,6 +224,25 @@ bool acpi_dev_resource_address_space(struct acpi_resource *ares,
>
> return true;
> }
> +EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space_full);
> +
> +/**
> + * acpi_dev_resource_address_space - Extract ACPI address space information.
> + * @ares: Input ACPI resource object.
> + * @res: Output generic resource object.
> + *
> + * Check if the given ACPI resource object represents an address space resource
> + * and if that's the case, use the information in it to populate the generic
> + * resource object pointed to by @res.
"If @ares is an address space resource, use it to populate the generic @res."
> + */
> +bool acpi_dev_resource_address_space(struct acpi_resource *ares,
> + struct resource *res)
> +{
> + struct acpi_resource_address64 addr;
> +
> + return acpi_dev_resource_address_space_full(ares, &addr,
> + res);
> +}
> EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space);
>
> /**
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index a5db4ae..1f6701e 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -260,6 +260,9 @@ bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res);
> bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res);
> bool acpi_dev_resource_address_space(struct acpi_resource *ares,
> struct resource *res);
> +bool acpi_dev_resource_address_space_full(struct acpi_resource *ares,
> + struct acpi_resource_address64 *addr,
> + struct resource *res);
> bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
> struct resource *res);
> unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable);
> --
> 1.8.2.1
>
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