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SubjectRe: [PATCH] IPMI: reserve memio regions separately
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On Tue, 2016-04-26 at 23:31 -0500, minyard@acm.org wrote:
> From: Corey Minyard <cminyard@mvista.com>
>
> Commit d61a3ead2680 ("[PATCH] IPMI: reserve I/O ports separately")
> changed the way I/O ports were reserved and includes this comment in
> log:
>
>  Some BIOSes reserve disjoint I/O regions in their ACPI tables for the IPMI
>  controller.  This causes problems when trying to register the entire I/O
>  region.  Therefore we must register each I/O port separately.
>
> There is a similar problem with memio regions on an arm64 platform
> (AMD Seattle). Where I see:
>
>  ipmi message handler version 39.2
>  ipmi_si AMDI0300:00: probing via device tree
>  ipmi_si AMDI0300:00: ipmi_si: probing via ACPI
>  ipmi_si AMDI0300:00: [mem 0xe0010000] regsize 1 spacing 4 irq 23
>  ipmi_si: Adding ACPI-specified kcs state machine
>  IPMI System Interface driver.
>  ipmi_si: Trying ACPI-specified kcs state machine at mem \
>           address 0xe0010000, slave address 0x0, irq 23
>  ipmi_si: Could not set up I/O space
>
> The problem is that the ACPI core registers disjoint regions for the
> platform device:
>
> e0010000-e0010000 : AMDI0300:00
> e0010004-e0010004 : AMDI0300:00
>
> and the ipmi_si driver tries to register one region e0010000-e0010004.
>
> Based on a patch from Mark Salter <msalter@redhat.com>
>
> Signed-off-by: Corey Minyard <cminyard@mvista.com>
> ---

This works for me as well.

Tested-by: Mark Salter <msalter@redhat.com>

>  drivers/char/ipmi/ipmi_si_intf.c | 40 +++++++++++++++++++++++++++-------------
>  1 file changed, 27 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
> index 6ecf9af..a815044 100644
> --- a/drivers/char/ipmi/ipmi_si_intf.c
> +++ b/drivers/char/ipmi/ipmi_si_intf.c
> @@ -1637,25 +1637,28 @@ static void mem_outq(const struct si_sm_io *io, unsigned int offset,
>  }
>  #endif
>  
> -static void mem_cleanup(struct smi_info *info)
> +static void mem_region_cleanup(struct smi_info *info, int num)
>  {
>   unsigned long addr = info->io.addr_data;
> - int           mapsize;
> + int idx;
> +
> + for (idx = 0; idx < num; idx++)
> + release_mem_region(addr + idx * info->io.regspacing,
> +    info->io.regsize);
> +}
>  
> +static void mem_cleanup(struct smi_info *info)
> +{
>   if (info->io.addr) {
>   iounmap(info->io.addr);
> -
> - mapsize = ((info->io_size * info->io.regspacing)
> -    - (info->io.regspacing - info->io.regsize));
> -
> - release_mem_region(addr, mapsize);
> + mem_region_cleanup(info, info->io_size);
>   }
>  }
>  
>  static int mem_setup(struct smi_info *info)
>  {
>   unsigned long addr = info->io.addr_data;
> - int           mapsize;
> + int           mapsize, idx;
>  
>   if (!addr)
>   return -ENODEV;
> @@ -1692,6 +1695,21 @@ static int mem_setup(struct smi_info *info)
>   }
>  
>   /*
> +  * Some BIOSes reserve disjoint memory regions in their ACPI
> +  * tables.  This causes problems when trying to request the
> +  * entire region.  Therefore we must request each register
> +  * separately.
> +  */
> + for (idx = 0; idx < info->io_size; idx++) {
> + if (request_mem_region(addr + idx * info->io.regspacing,
> +        info->io.regsize, DEVICE_NAME) == NULL) {
> + /* Undo allocations */
> + mem_region_cleanup(info, idx);
> + return -EIO;
> + }
> + }
> +
> + /*
>    * Calculate the total amount of memory to claim.  This is an
>    * unusual looking calculation, but it avoids claiming any
>    * more memory than it has to.  It will claim everything
> @@ -1700,13 +1718,9 @@ static int mem_setup(struct smi_info *info)
>    */
>   mapsize = ((info->io_size * info->io.regspacing)
>      - (info->io.regspacing - info->io.regsize));
> -
> - if (request_mem_region(addr, mapsize, DEVICE_NAME) == NULL)
> - return -EIO;
> -
>   info->io.addr = ioremap(addr, mapsize);
>   if (info->io.addr == NULL) {
> - release_mem_region(addr, mapsize);
> + mem_region_cleanup(info, info->io_size);
>   return -EIO;
>   }
>   return 0;

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