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IPMI: reserve memio regions separately 

Commit d61a3ead26 ("[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>, who also wrote
all the above text.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Tested-by: Mark Salter <msalter@redhat.com>
This commit is contained in:
Corey Minyard 2016-04-26 22:25:12 -05:00
parent 76824852a9
commit 57a38f1340
1 changed files with 27 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/char/ipmi/ipmi_si_intf.c
View File

@ -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;
@ -1691,6 +1694,21 @@ static int mem_setup(struct smi_info *info)
return -EINVAL;
}
/*
* 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
@ -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;