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i2o: Refactor i2o_iop_systab_set() PCI space allocation

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Refactor the PCI space allocation in i2o_iop_systab_set().  This might
improve readability slightly, but mainly it is to make the next patch
simpler.

No functional change.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2014-02-26 11:25:57 -07:00
parent 5c513bd580
commit 60f061e193
1 changed files with 46 additions and 43 deletions
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89
drivers/message/i2o/iop.c
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@ -652,6 +652,48 @@ static int i2o_iop_activate(struct i2o_controller *c)
return i2o_hrt_get(c);
};
static void i2o_res_alloc(struct i2o_controller *c, unsigned long flags)
{
i2o_status_block *sb = c->status_block.virt;
struct resource *root, *res = &c->mem_resource;
resource_size_t size, min, max, align;
int err;
res->name = c->pdev->bus->name;
res->flags = flags;
res->start = 0;
res->end = 0;
osm_info("%s: requires private memory resources.\n", c->name);
root = pci_find_parent_resource(c->pdev, res);
if (root == NULL) {
osm_warn("%s: Can't find parent resource!\n", c->name);
return;
}
if (flags & IORESOURCE_MEM) {
size = min = max = sb->desired_mem_size;
align = 1 << 20; /* unspecified, use 1Mb and play safe */
} else {
size = min = max = sb->desired_io_size;
align = 1 << 12; /* unspecified, use 4Kb and play safe */
}
err = allocate_resource(root, res, size, min, max, align, NULL, NULL);
if (err < 0)
return;
if (flags & IORESOURCE_MEM) {
c->mem_alloc = 1;
sb->current_mem_size = resource_size(res);
sb->current_mem_base = res->start;
} else if (flags & IORESOURCE_IO) {
c->io_alloc = 1;
sb->current_io_size = resource_size(res);
sb->current_io_base = res->start;
}
osm_info("%s: allocated PCI space %pR\n", c->name, res);
}
/**
* i2o_iop_systab_set - Set the I2O System Table of the specified IOP
* @c: I2O controller to which the system table should be send
@ -665,52 +707,13 @@ static int i2o_iop_systab_set(struct i2o_controller *c)
struct i2o_message *msg;
i2o_status_block *sb = c->status_block.virt;
struct device *dev = &c->pdev->dev;
struct resource *root;
int rc;
if (sb->current_mem_size < sb->desired_mem_size) {
struct resource *res = &c->mem_resource;
res->name = c->pdev->bus->name;
res->flags = IORESOURCE_MEM;
res->start = 0;
res->end = 0;
osm_info("%s: requires private memory resources.\n", c->name);
root = pci_find_parent_resource(c->pdev, res);
if (root == NULL)
osm_warn("%s: Can't find parent resource!\n", c->name);
if (root && allocate_resource(root, res, sb->desired_mem_size, sb->desired_mem_size, sb->desired_mem_size, 1 << 20, /* Unspecified, so use 1Mb and play safe */
NULL, NULL) >= 0) {
c->mem_alloc = 1;
sb->current_mem_size = resource_size(res);
sb->current_mem_base = res->start;
osm_info("%s: allocated %llu bytes of PCI memory at "
"0x%016llX.\n", c->name,
(unsigned long long)resource_size(res),
(unsigned long long)res->start);
}
}
if (sb->current_mem_size < sb->desired_mem_size)
i2o_res_alloc(c, IORESOURCE_MEM);
if (sb->current_io_size < sb->desired_io_size) {
struct resource *res = &c->io_resource;
res->name = c->pdev->bus->name;
res->flags = IORESOURCE_IO;
res->start = 0;
res->end = 0;
osm_info("%s: requires private memory resources.\n", c->name);
root = pci_find_parent_resource(c->pdev, res);
if (root == NULL)
osm_warn("%s: Can't find parent resource!\n", c->name);
if (root && allocate_resource(root, res, sb->desired_io_size, sb->desired_io_size, sb->desired_io_size, 1 << 12, /* Unspecified, so use 4Kb and play safe */
NULL, NULL) >= 0) {
c->io_alloc = 1;
sb->current_io_size = resource_size(res);
sb->current_io_base = res->start;
osm_info("%s: allocated %llu bytes of PCI I/O at "
"0x%016llX.\n", c->name,
(unsigned long long)resource_size(res),
(unsigned long long)res->start);
}
}
if (sb->current_io_size < sb->desired_io_size)
i2o_res_alloc(c, IORESOURCE_IO);
msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
if (IS_ERR(msg))