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vme: move tsi148 error handling into VME subsystem 

Error handling code found in tsi148 is not device specific. In fact it
already relies on shared vme_bus_error struct and vme_bridge.vme_errors
field. The other bridge driver could reuse this code if it is shared.

This introduces a slight behavior change: vme error message won't be
triggered in a rare case when err_chk=1 and kmalloc fails.

Signed-off-by: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Cc: Igor Alekseev <igor.alekseev@itep.ru>
Acked-by: Martyn Welch <martyn@welchs.me.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Kalinkin 2015-09-18 02:01:42 +03:00 committed by Greg Kroah-Hartman
parent da5ae8a991
commit e2c6393fda
3 changed files with 99 additions and 86 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

93
drivers/vme/bridges/vme_tsi148.c
View File

@ -169,7 +169,6 @@ static u32 tsi148_VERR_irqhandler(struct vme_bridge *tsi148_bridge)
unsigned int error_addr_high, error_addr_low;
unsigned long long error_addr;
u32 error_attrib;
struct vme_bus_error *error = NULL;
struct tsi148_driver *bridge;
bridge = tsi148_bridge->driver_priv;
@ -186,23 +185,12 @@ static u32 tsi148_VERR_irqhandler(struct vme_bridge *tsi148_bridge)
"Occurred\n");
}
if (err_chk) {
error = kmalloc(sizeof(struct vme_bus_error), GFP_ATOMIC);
if (error) {
error->address = error_addr;
error->attributes = error_attrib;
list_add_tail(&error->list, &tsi148_bridge->vme_errors);
} else {
dev_err(tsi148_bridge->parent,
"Unable to alloc memory for VMEbus Error reporting\n");
}
}
if (!error) {
if (err_chk)
vme_bus_error_handler(tsi148_bridge, error_addr, error_attrib);
else
dev_err(tsi148_bridge->parent,
"VME Bus Error at address: 0x%llx, attributes: %08x\n",
error_addr, error_attrib);
}
/* Clear Status */
iowrite32be(TSI148_LCSR_VEAT_VESCL, bridge->base + TSI148_LCSR_VEAT);
@ -482,73 +470,6 @@ static int tsi148_irq_generate(struct vme_bridge *tsi148_bridge, int level,
return 0;
}
/*
* Find the first error in this address range
*/
static struct vme_bus_error *tsi148_find_error(struct vme_bridge *tsi148_bridge,
u32 aspace, unsigned long long address, size_t count)
{
struct list_head *err_pos;
struct vme_bus_error *vme_err, *valid = NULL;
unsigned long long bound;
bound = address + count;
/*
* XXX We are currently not looking at the address space when parsing
* for errors. This is because parsing the Address Modifier Codes
* is going to be quite resource intensive to do properly. We
* should be OK just looking at the addresses and this is certainly
* much better than what we had before.
*/
err_pos = NULL;
/* Iterate through errors */
list_for_each(err_pos, &tsi148_bridge->vme_errors) {
vme_err = list_entry(err_pos, struct vme_bus_error, list);
if ((vme_err->address >= address) &&
(vme_err->address < bound)) {
valid = vme_err;
break;
}
}
return valid;
}
/*
* Clear errors in the provided address range.
*/
static void tsi148_clear_errors(struct vme_bridge *tsi148_bridge,
u32 aspace, unsigned long long address, size_t count)
{
struct list_head *err_pos, *temp;
struct vme_bus_error *vme_err;
unsigned long long bound;
bound = address + count;
/*
* XXX We are currently not looking at the address space when parsing
* for errors. This is because parsing the Address Modifier Codes
* is going to be quite resource intensive to do properly. We
* should be OK just looking at the addresses and this is certainly
* much better than what we had before.
*/
err_pos = NULL;
/* Iterate through errors */
list_for_each_safe(err_pos, temp, &tsi148_bridge->vme_errors) {
vme_err = list_entry(err_pos, struct vme_bus_error, list);
if ((vme_err->address >= address) &&
(vme_err->address < bound)) {
list_del(err_pos);
kfree(vme_err);
}
}
}
/*
* Initialize a slave window with the requested attributes.
*/
@ -1323,14 +1244,14 @@ out:
__tsi148_master_get(image, &enabled, &vme_base, &size, &aspace, &cycle,
&dwidth);
vme_err = tsi148_find_error(tsi148_bridge, aspace, vme_base + offset,
vme_err = vme_find_error(tsi148_bridge, aspace, vme_base + offset,
count);
if (vme_err != NULL) {
dev_err(image->parent->parent, "First VME read error detected "
"an at address 0x%llx\n", vme_err->address);
retval = vme_err->address - (vme_base + offset);
/* Clear down save errors in this address range */
tsi148_clear_errors(tsi148_bridge, aspace, vme_base + offset,
vme_clear_errors(tsi148_bridge, aspace, vme_base + offset,
count);
}
@ -1422,14 +1343,14 @@ out:
ioread16(bridge->flush_image->kern_base + 0x7F000);
vme_err = tsi148_find_error(tsi148_bridge, aspace, vme_base + offset,
vme_err = vme_find_error(tsi148_bridge, aspace, vme_base + offset,
count);
if (vme_err != NULL) {
dev_warn(tsi148_bridge->parent, "First VME write error detected"
" an at address 0x%llx\n", vme_err->address);
retval = vme_err->address - (vme_base + offset);
/* Clear down save errors in this address range */
tsi148_clear_errors(tsi148_bridge, aspace, vme_base + offset,
vme_clear_errors(tsi148_bridge, aspace, vme_base + offset,
count);
}

86
drivers/vme/vme.c
View File

@ -990,6 +990,92 @@ int vme_dma_free(struct vme_resource *resource)
}
EXPORT_SYMBOL(vme_dma_free);
void vme_bus_error_handler(struct vme_bridge *bridge,
unsigned long long address, u32 attributes)
{
struct vme_bus_error *error;
error = kmalloc(sizeof(struct vme_bus_error), GFP_ATOMIC);
if (error) {
error->address = address;
error->attributes = attributes;
list_add_tail(&error->list, &bridge->vme_errors);
} else {
dev_err(bridge->parent,
"Unable to alloc memory for VMEbus Error reporting\n");
}
}
EXPORT_SYMBOL(vme_bus_error_handler);
/*
* Find the first error in this address range
*/
struct vme_bus_error *vme_find_error(struct vme_bridge *bridge, u32 aspace,
unsigned long long address, size_t count)
{
struct list_head *err_pos;
struct vme_bus_error *vme_err, *valid = NULL;
unsigned long long bound;
bound = address + count;
/*
* XXX We are currently not looking at the address space when parsing
* for errors. This is because parsing the Address Modifier Codes
* is going to be quite resource intensive to do properly. We
* should be OK just looking at the addresses and this is certainly
* much better than what we had before.
*/
err_pos = NULL;
/* Iterate through errors */
list_for_each(err_pos, &bridge->vme_errors) {
vme_err = list_entry(err_pos, struct vme_bus_error, list);
if ((vme_err->address >= address) &&
(vme_err->address < bound)) {
valid = vme_err;
break;
}
}
return valid;
}
EXPORT_SYMBOL(vme_find_error);
/*
* Clear errors in the provided address range.
*/
void vme_clear_errors(struct vme_bridge *bridge, u32 aspace,
unsigned long long address, size_t count)
{
struct list_head *err_pos, *temp;
struct vme_bus_error *vme_err;
unsigned long long bound;
bound = address + count;
/*
* XXX We are currently not looking at the address space when parsing
* for errors. This is because parsing the Address Modifier Codes
* is going to be quite resource intensive to do properly. We
* should be OK just looking at the addresses and this is certainly
* much better than what we had before.
*/
err_pos = NULL;
/* Iterate through errors */
list_for_each_safe(err_pos, temp, &bridge->vme_errors) {
vme_err = list_entry(err_pos, struct vme_bus_error, list);
if ((vme_err->address >= address) &&
(vme_err->address < bound)) {
list_del(err_pos);
kfree(vme_err);
}
}
}
EXPORT_SYMBOL(vme_clear_errors);
void vme_irq_handler(struct vme_bridge *bridge, int level, int statid)
{
void (*call)(int, int, void *);

6
drivers/vme/vme_bridge.h
View File

@ -166,6 +166,12 @@ struct vme_bridge {
void *vaddr, dma_addr_t dma);
};
void vme_bus_error_handler(struct vme_bridge *bridge,
unsigned long long address, u32 attributes);
struct vme_bus_error *vme_find_error(struct vme_bridge *bridge, u32 aspace,
unsigned long long address, size_t count);
void vme_clear_errors(struct vme_bridge *bridge, u32 aspace,
unsigned long long address, size_t count);
void vme_irq_handler(struct vme_bridge *, int, int);
int vme_register_bridge(struct vme_bridge *);