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authorSebastian Ott <sebott@linux.vnet.ibm.com>2013-11-12 19:33:06 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-11-15 14:08:37 +0100
commit7a572a3ab1d1d346fcde5243914a18b0218780e9 (patch)
tree35fc7fdac2f24256204467609a3c0455fe51e836 /arch
parentd1e61fe49fd450be15d402ac353784f5ba8a624e (diff)
downloadlinux-7a572a3ab1d1d346fcde5243914a18b0218780e9.tar.bz2
s390/pci: improve handling of bus resources
Cleanup the functions for allocation and setup of bus resources. Do not allocate the same name for each resource but use a per-bus name. Also provide means to cleanup all resources allocated by a bus. Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/include/asm/pci.h4
-rw-r--r--arch/s390/pci/pci.c147
2 files changed, 86 insertions, 65 deletions
diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index 1cc185da9d38..b9315c424628 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -63,9 +63,10 @@ enum zpci_state {
};
struct zpci_bar_struct {
+ struct resource *res; /* bus resource */
u32 val; /* bar start & 3 flag bits */
- u8 size; /* order 2 exponent */
u16 map_idx; /* index into bar mapping array */
+ u8 size; /* order 2 exponent */
};
/* Private data per function */
@@ -97,6 +98,7 @@ struct zpci_dev {
unsigned long iommu_pages;
unsigned int next_bit;
+ char res_name[16];
struct zpci_bar_struct bars[PCI_BAR_COUNT];
u64 start_dma; /* Start of available DMA addresses */
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index 0c9a17780e4b..63a086072edb 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -579,37 +579,6 @@ static void zpci_irq_exit(void)
unregister_adapter_interrupt(&zpci_airq);
}
-static struct resource *zpci_alloc_bus_resource(unsigned long start, unsigned long size,
- unsigned long flags, int domain)
-{
- struct resource *r;
- char *name;
- int rc;
-
- r = kzalloc(sizeof(*r), GFP_KERNEL);
- if (!r)
- return ERR_PTR(-ENOMEM);
- r->start = start;
- r->end = r->start + size - 1;
- r->flags = flags;
- r->parent = &iomem_resource;
- name = kmalloc(18, GFP_KERNEL);
- if (!name) {
- kfree(r);
- return ERR_PTR(-ENOMEM);
- }
- sprintf(name, "PCI Bus: %04x:%02x", domain, ZPCI_BUS_NR);
- r->name = name;
-
- rc = request_resource(&iomem_resource, r);
- if (rc) {
- kfree(r->name);
- kfree(r);
- return ERR_PTR(-ENOMEM);
- }
- return r;
-}
-
static int zpci_alloc_iomap(struct zpci_dev *zdev)
{
int entry;
@@ -633,6 +602,82 @@ static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
spin_unlock(&zpci_iomap_lock);
}
+static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
+ unsigned long size, unsigned long flags)
+{
+ struct resource *r;
+
+ r = kzalloc(sizeof(*r), GFP_KERNEL);
+ if (!r)
+ return NULL;
+
+ r->start = start;
+ r->end = r->start + size - 1;
+ r->flags = flags;
+ r->name = zdev->res_name;
+
+ if (request_resource(&iomem_resource, r)) {
+ kfree(r);
+ return NULL;
+ }
+ return r;
+}
+
+static int zpci_setup_bus_resources(struct zpci_dev *zdev,
+ struct list_head *resources)
+{
+ unsigned long addr, size, flags;
+ struct resource *res;
+ int i, entry;
+
+ snprintf(zdev->res_name, sizeof(zdev->res_name),
+ "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
+
+ for (i = 0; i < PCI_BAR_COUNT; i++) {
+ if (!zdev->bars[i].size)
+ continue;
+ entry = zpci_alloc_iomap(zdev);
+ if (entry < 0)
+ return entry;
+ zdev->bars[i].map_idx = entry;
+
+ /* only MMIO is supported */
+ flags = IORESOURCE_MEM;
+ if (zdev->bars[i].val & 8)
+ flags |= IORESOURCE_PREFETCH;
+ if (zdev->bars[i].val & 4)
+ flags |= IORESOURCE_MEM_64;
+
+ addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48);
+
+ size = 1UL << zdev->bars[i].size;
+
+ res = __alloc_res(zdev, addr, size, flags);
+ if (!res) {
+ zpci_free_iomap(zdev, entry);
+ return -ENOMEM;
+ }
+ zdev->bars[i].res = res;
+ pci_add_resource(resources, res);
+ }
+
+ return 0;
+}
+
+static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
+{
+ int i;
+
+ for (i = 0; i < PCI_BAR_COUNT; i++) {
+ if (!zdev->bars[i].size)
+ continue;
+
+ zpci_free_iomap(zdev, zdev->bars[i].map_idx);
+ release_resource(zdev->bars[i].res);
+ kfree(zdev->bars[i].res);
+ }
+}
+
int pcibios_add_device(struct pci_dev *pdev)
{
struct zpci_dev *zdev = get_zdev(pdev);
@@ -731,45 +776,19 @@ struct dev_pm_ops pcibios_pm_ops = {
static int zpci_scan_bus(struct zpci_dev *zdev)
{
- struct resource *res;
LIST_HEAD(resources);
- int i;
-
- /* allocate mapping entry for each used bar */
- for (i = 0; i < PCI_BAR_COUNT; i++) {
- unsigned long addr, size, flags;
- int entry;
-
- if (!zdev->bars[i].size)
- continue;
- entry = zpci_alloc_iomap(zdev);
- if (entry < 0)
- return entry;
- zdev->bars[i].map_idx = entry;
-
- /* only MMIO is supported */
- flags = IORESOURCE_MEM;
- if (zdev->bars[i].val & 8)
- flags |= IORESOURCE_PREFETCH;
- if (zdev->bars[i].val & 4)
- flags |= IORESOURCE_MEM_64;
-
- addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48);
-
- size = 1UL << zdev->bars[i].size;
+ int ret;
- res = zpci_alloc_bus_resource(addr, size, flags, zdev->domain);
- if (IS_ERR(res)) {
- zpci_free_iomap(zdev, entry);
- return PTR_ERR(res);
- }
- pci_add_resource(&resources, res);
- }
+ ret = zpci_setup_bus_resources(zdev, &resources);
+ if (ret)
+ return ret;
zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
zdev, &resources);
- if (!zdev->bus)
+ if (!zdev->bus) {
+ zpci_cleanup_bus_resources(zdev);
return -EIO;
+ }
zdev->bus->max_bus_speed = zdev->max_bus_speed;
return 0;