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.
This patch creates helper functions for region reservation so that
mem/port setup/cleanup ops can share the code which requests and
releases the regions separately.
Signed-off-by: Mark Salter <[email protected]>
---
drivers/char/ipmi/ipmi_si_intf.c | 74 +++++++++++++++++++++++++++++-----------
1 file changed, 54 insertions(+), 20 deletions(-)
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 7fddd86..0149397 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -1476,6 +1476,51 @@ static int std_irq_setup(struct smi_info *info)
return rv;
}
+static void region_cleanup(struct smi_info *info, int num, bool is_memio)
+{
+ unsigned long addr = info->io.addr_data;
+ int idx;
+
+ for (idx = 0; idx < num; idx++) {
+ if (is_memio)
+ release_mem_region(addr + idx * info->io.regspacing,
+ info->io.regsize);
+ else
+ release_region(addr + idx * info->io.regspacing,
+ info->io.regsize);
+ }
+}
+
+static int region_setup(struct smi_info *info, bool is_memio)
+{
+ unsigned long addr = info->io.addr_data;
+ struct resource *res;
+ int idx, offset;
+
+ /*
+ * Some BIOSes reserve disjoint I/O regions in their ACPI
+ * tables. This causes problems when trying to register the
+ * entire I/O region. Therefore we must register each I/O
+ * region separately.
+ */
+ for (idx = 0; idx < info->io_size; idx++) {
+ offset = idx * info->io.regspacing;
+ if (is_memio)
+ res = request_mem_region(addr + offset,
+ info->io.regsize, DEVICE_NAME);
+ else
+ res = request_region(addr + offset,
+ info->io.regsize, DEVICE_NAME);
+
+ if (res == NULL) {
+ /* Undo allocations */
+ region_cleanup(info, idx, is_memio);
+ return -EIO;
+ }
+ }
+ return 0;
+}
+
static unsigned char port_inb(const struct si_sm_io *io, unsigned int offset)
{
unsigned int addr = io->addr_data;
@@ -1523,14 +1568,8 @@ static void port_outl(const struct si_sm_io *io,
unsigned int offset,
static void port_cleanup(struct smi_info *info)
{
- unsigned int addr = info->io.addr_data;
- int idx;
-
- if (addr) {
- for (idx = 0; idx < info->io_size; idx++)
- release_region(addr + idx * info->io.regspacing,
- info->io.regsize);
- }
+ if (info->io.addr_data)
+ region_cleanup(info, info->io_size, false);
}
static int port_setup(struct smi_info *info)
@@ -1640,23 +1679,17 @@ static void mem_outq(const struct si_sm_io *io,
unsigned int offset,
static void mem_cleanup(struct smi_info *info)
{
- unsigned long addr = info->io.addr_data;
- int mapsize;
-
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);
+ region_cleanup(info, info->io_size, true);
}
}
static int mem_setup(struct smi_info *info)
{
unsigned long addr = info->io.addr_data;
- int mapsize;
+ int mapsize, err;
if (!addr)
return -ENODEV;
@@ -1692,6 +1725,10 @@ static int mem_setup(struct smi_info *info)
return -EINVAL;
}
+ err = region_setup(info, true);
+ if (err)
+ return err;
+
/*
* Calculate the total amount of memory to claim. This is an
* unusual looking calculation, but it avoids claiming any
@@ -1702,12 +1739,9 @@ 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);
+ region_cleanup(info, info->io_size, true);
return -EIO;
}
return 0;
--
1.8.3.1
