pcmcia: rsrc_nonstatic io memory probe improvements
Add a lot of documentation to the rsrc_nonstatic io memory probe functions. Also, add a first memory probe call -- just checking whether request_resource() succeeds -- upon adding of resources. Tested-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski
Родитель
180c33ee40
Коммит
3f32b3c093
|
|
@ -264,18 +264,15 @@ static void do_io_probe(struct pcmcia_socket *s, unsigned int base,
|
|||
}
|
||||
#endif
|
||||
|
||||
/*======================================================================
|
||||
/*======================================================================*/
|
||||
|
||||
This is tricky... when we set up CIS memory, we try to validate
|
||||
the memory window space allocations.
|
||||
|
||||
======================================================================*/
|
||||
|
||||
/* Validation function for cards with a valid CIS */
|
||||
/**
|
||||
* readable() - iomem validation function for cards with a valid CIS
|
||||
*/
|
||||
static int readable(struct pcmcia_socket *s, struct resource *res,
|
||||
unsigned int *count)
|
||||
{
|
||||
int ret = -1;
|
||||
int ret = -EINVAL;
|
||||
|
||||
s->cis_mem.res = res;
|
||||
s->cis_virt = ioremap(res->start, s->map_size);
|
||||
|
|
@ -286,13 +283,16 @@ static int readable(struct pcmcia_socket *s, struct resource *res,
|
|||
s->cis_virt = NULL;
|
||||
}
|
||||
s->cis_mem.res = NULL;
|
||||
if ((ret != 0) || (*count == 0))
|
||||
return 0;
|
||||
return 1;
|
||||
if ((ret) || (*count == 0))
|
||||
return -EINVAL;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Validation function for simple memory cards */
|
||||
static int checksum(struct pcmcia_socket *s, struct resource *res)
|
||||
/**
|
||||
* checksum() - iomem validation function for simple memory cards
|
||||
*/
|
||||
static int checksum(struct pcmcia_socket *s, struct resource *res,
|
||||
unsigned int *value)
|
||||
{
|
||||
pccard_mem_map map;
|
||||
int i, a = 0, b = -1, d;
|
||||
|
|
@ -320,61 +320,83 @@ static int checksum(struct pcmcia_socket *s, struct resource *res)
|
|||
iounmap(virt);
|
||||
}
|
||||
|
||||
return (b == -1) ? -1 : (a>>1);
|
||||
if (b == -1)
|
||||
return -EINVAL;
|
||||
|
||||
*value = a;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
cis_readable(struct pcmcia_socket *s, unsigned long base, unsigned long size)
|
||||
/**
|
||||
* do_validate_mem() - low level validate a memory region for PCMCIA use
|
||||
* @s: PCMCIA socket to validate
|
||||
* @base: start address of resource to check
|
||||
* @size: size of resource to check
|
||||
* @validate: validation function to use
|
||||
*
|
||||
* do_validate_mem() splits up the memory region which is to be checked
|
||||
* into two parts. Both are passed to the @validate() function. If
|
||||
* @validate() returns non-zero, or the value parameter to @validate()
|
||||
* is zero, or the value parameter is different between both calls,
|
||||
* the check fails, and -EINVAL is returned. Else, 0 is returned.
|
||||
*/
|
||||
static int do_validate_mem(struct pcmcia_socket *s,
|
||||
unsigned long base, unsigned long size,
|
||||
int validate (struct pcmcia_socket *s,
|
||||
struct resource *res,
|
||||
unsigned int *value))
|
||||
{
|
||||
struct resource *res1, *res2;
|
||||
unsigned int info1, info2;
|
||||
int ret = 0;
|
||||
unsigned int info1 = 1, info2 = 1;
|
||||
int ret = -EINVAL;
|
||||
|
||||
res1 = claim_region(s, base, size/2, IORESOURCE_MEM, "PCMCIA memprobe");
|
||||
res2 = claim_region(s, base + size/2, size/2, IORESOURCE_MEM,
|
||||
"PCMCIA memprobe");
|
||||
|
||||
if (res1 && res2) {
|
||||
ret = readable(s, res1, &info1);
|
||||
ret += readable(s, res2, &info2);
|
||||
ret = 0;
|
||||
if (validate) {
|
||||
ret = validate(s, res1, &info1);
|
||||
ret += validate(s, res2, &info2);
|
||||
}
|
||||
}
|
||||
|
||||
free_region(res2);
|
||||
free_region(res1);
|
||||
|
||||
return (ret == 2) && (info1 == info2);
|
||||
dev_dbg(&s->dev, "cs: memory probe 0x%06lx-0x%06lx: %p %p %u %u %u",
|
||||
base, base+size-1, res1, res2, ret, info1, info2);
|
||||
|
||||
if ((ret) || (info1 != info2) || (info1 == 0))
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
checksum_match(struct pcmcia_socket *s, unsigned long base, unsigned long size)
|
||||
{
|
||||
struct resource *res1, *res2;
|
||||
int a = -1, b = -1;
|
||||
|
||||
res1 = claim_region(s, base, size/2, IORESOURCE_MEM, "PCMCIA memprobe");
|
||||
res2 = claim_region(s, base + size/2, size/2, IORESOURCE_MEM,
|
||||
"PCMCIA memprobe");
|
||||
|
||||
if (res1 && res2) {
|
||||
a = checksum(s, res1);
|
||||
b = checksum(s, res2);
|
||||
}
|
||||
|
||||
free_region(res2);
|
||||
free_region(res1);
|
||||
|
||||
return (a == b) && (a >= 0);
|
||||
}
|
||||
|
||||
/*======================================================================
|
||||
|
||||
The memory probe. If the memory list includes a 64K-aligned block
|
||||
below 1MB, we probe in 64K chunks, and as soon as we accumulate at
|
||||
least mem_limit free space, we quit.
|
||||
|
||||
======================================================================*/
|
||||
|
||||
static int do_mem_probe(u_long base, u_long num, struct pcmcia_socket *s)
|
||||
/**
|
||||
* do_mem_probe() - validate a memory region for PCMCIA use
|
||||
* @s: PCMCIA socket to validate
|
||||
* @base: start address of resource to check
|
||||
* @num: size of resource to check
|
||||
* @validate: validation function to use
|
||||
* @fallback: validation function to use if validate fails
|
||||
*
|
||||
* do_mem_probe() checks a memory region for use by the PCMCIA subsystem.
|
||||
* To do so, the area is split up into sensible parts, and then passed
|
||||
* into the @validate() function. Only if @validate() and @fallback() fail,
|
||||
* the area is marked as unavaibale for use by the PCMCIA subsystem. The
|
||||
* function returns the size of the usable memory area.
|
||||
*/
|
||||
static int do_mem_probe(struct pcmcia_socket *s, u_long base, u_long num,
|
||||
int validate (struct pcmcia_socket *s,
|
||||
struct resource *res,
|
||||
unsigned int *value),
|
||||
int fallback (struct pcmcia_socket *s,
|
||||
struct resource *res,
|
||||
unsigned int *value))
|
||||
{
|
||||
struct socket_data *s_data = s->resource_data;
|
||||
u_long i, j, bad, fail, step;
|
||||
|
|
@ -392,15 +414,14 @@ static int do_mem_probe(u_long base, u_long num, struct pcmcia_socket *s)
|
|||
for (i = j = base; i < base+num; i = j + step) {
|
||||
if (!fail) {
|
||||
for (j = i; j < base+num; j += step) {
|
||||
if (cis_readable(s, j, step))
|
||||
if (!do_validate_mem(s, j, step, validate))
|
||||
break;
|
||||
}
|
||||
fail = ((i == base) && (j == base+num));
|
||||
}
|
||||
if (fail) {
|
||||
for (j = i; j < base+num; j += 2*step)
|
||||
if (checksum_match(s, j, step) &&
|
||||
checksum_match(s, j + step, step))
|
||||
if ((fail) && (fallback)) {
|
||||
for (j = i; j < base+num; j += step)
|
||||
if (!do_validate_mem(s, j, step, fallback))
|
||||
break;
|
||||
}
|
||||
if (i != j) {
|
||||
|
|
@ -415,8 +436,14 @@ static int do_mem_probe(u_long base, u_long num, struct pcmcia_socket *s)
|
|||
return num - bad;
|
||||
}
|
||||
|
||||
|
||||
#ifdef CONFIG_PCMCIA_PROBE
|
||||
|
||||
/**
|
||||
* inv_probe() - top-to-bottom search for one usuable high memory area
|
||||
* @s: PCMCIA socket to validate
|
||||
* @m: resource_map to check
|
||||
*/
|
||||
static u_long inv_probe(struct resource_map *m, struct pcmcia_socket *s)
|
||||
{
|
||||
struct socket_data *s_data = s->resource_data;
|
||||
|
|
@ -431,9 +458,18 @@ static u_long inv_probe(struct resource_map *m, struct pcmcia_socket *s)
|
|||
}
|
||||
if (m->base < 0x100000)
|
||||
return 0;
|
||||
return do_mem_probe(m->base, m->num, s);
|
||||
return do_mem_probe(s, m->base, m->num, readable, checksum);
|
||||
}
|
||||
|
||||
/**
|
||||
* validate_mem() - memory probe function
|
||||
* @s: PCMCIA socket to validate
|
||||
* @probe_mask: MEM_PROBE_LOW | MEM_PROBE_HIGH
|
||||
*
|
||||
* The memory probe. If the memory list includes a 64K-aligned block
|
||||
* below 1MB, we probe in 64K chunks, and as soon as we accumulate at
|
||||
* least mem_limit free space, we quit. Returns 0 on usuable ports.
|
||||
*/
|
||||
static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
|
||||
{
|
||||
struct resource_map *m, mm;
|
||||
|
|
@ -456,7 +492,8 @@ static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
|
|||
if (mm.base >= 0x100000)
|
||||
continue;
|
||||
if ((mm.base | mm.num) & 0xffff) {
|
||||
ok += do_mem_probe(mm.base, mm.num, s);
|
||||
ok += do_mem_probe(s, mm.base, mm.num, readable,
|
||||
checksum);
|
||||
continue;
|
||||
}
|
||||
/* Special probe for 64K-aligned block */
|
||||
|
|
@ -466,7 +503,8 @@ static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
|
|||
if (ok >= mem_limit)
|
||||
sub_interval(&s_data->mem_db, b, 0x10000);
|
||||
else
|
||||
ok += do_mem_probe(b, 0x10000, s);
|
||||
ok += do_mem_probe(s, b, 0x10000,
|
||||
readable, checksum);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -479,6 +517,13 @@ static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
|
|||
|
||||
#else /* CONFIG_PCMCIA_PROBE */
|
||||
|
||||
/**
|
||||
* validate_mem() - memory probe function
|
||||
* @s: PCMCIA socket to validate
|
||||
* @probe_mask: ignored
|
||||
*
|
||||
* Returns 0 on usuable ports.
|
||||
*/
|
||||
static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
|
||||
{
|
||||
struct resource_map *m, mm;
|
||||
|
|
@ -487,7 +532,7 @@ static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
|
|||
|
||||
for (m = s_data->mem_db.next; m != &s_data->mem_db; m = mm.next) {
|
||||
mm = *m;
|
||||
ok += do_mem_probe(mm.base, mm.num, s);
|
||||
ok += do_mem_probe(s, mm.base, mm.num, readable, checksum);
|
||||
}
|
||||
if (ok > 0)
|
||||
return 0;
|
||||
|
|
@ -497,7 +542,13 @@ static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
|
|||
#endif /* CONFIG_PCMCIA_PROBE */
|
||||
|
||||
|
||||
/*
|
||||
/**
|
||||
* pcmcia_nonstatic_validate_mem() - try to validate iomem for PCMCIA use
|
||||
* @s: PCMCIA socket to validate
|
||||
*
|
||||
* This is tricky... when we set up CIS memory, we try to validate
|
||||
* the memory window space allocations.
|
||||
*
|
||||
* Locking note: Must be called with skt_mutex held!
|
||||
*/
|
||||
static int pcmcia_nonstatic_validate_mem(struct pcmcia_socket *s)
|
||||
|
|
@ -515,10 +566,11 @@ static int pcmcia_nonstatic_validate_mem(struct pcmcia_socket *s)
|
|||
probe_mask = MEM_PROBE_HIGH;
|
||||
|
||||
if (probe_mask & ~s_data->rsrc_mem_probe) {
|
||||
if (s->state & SOCKET_PRESENT)
|
||||
if (s->state & SOCKET_PRESENT) {
|
||||
ret = validate_mem(s, probe_mask);
|
||||
if (!ret)
|
||||
s_data->rsrc_mem_probe |= probe_mask;
|
||||
if (!ret)
|
||||
s_data->rsrc_mem_probe |= probe_mask;
|
||||
}
|
||||
}
|
||||
|
||||
mutex_unlock(&rsrc_mutex);
|
||||
|
|
@ -723,6 +775,8 @@ static int adjust_memory(struct pcmcia_socket *s, unsigned int action, unsigned
|
|||
switch (action) {
|
||||
case ADD_MANAGED_RESOURCE:
|
||||
ret = add_interval(&data->mem_db, start, size);
|
||||
if (!ret)
|
||||
do_mem_probe(s, start, size, NULL, NULL);
|
||||
break;
|
||||
case REMOVE_MANAGED_RESOURCE:
|
||||
ret = sub_interval(&data->mem_db, start, size);
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче