diff options
| -rw-r--r-- | arch/sparc64/kernel/pci_sun4v.c | 124 |
1 files changed, 118 insertions, 6 deletions
diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c index 2b7a1f316a93..0c0895202970 100644 --- a/arch/sparc64/kernel/pci_sun4v.c +++ b/arch/sparc64/kernel/pci_sun4v.c @@ -599,18 +599,128 @@ struct pci_iommu_ops pci_sun4v_iommu_ops = { /* SUN4V PCI configuration space accessors. */ -static inline int pci_sun4v_out_of_range(struct pci_pbm_info *pbm, unsigned int bus, unsigned int device, unsigned int func) +struct pdev_entry { + struct pdev_entry *next; + u32 devhandle; + unsigned int bus; + unsigned int device; + unsigned int func; +}; + +#define PDEV_HTAB_SIZE 16 +#define PDEV_HTAB_MASK (PDEV_HTAB_SIZE - 1) +static struct pdev_entry *pdev_htab[PDEV_HTAB_SIZE]; + +static inline unsigned int pdev_hashfn(u32 devhandle, unsigned int bus, unsigned int device, unsigned int func) { - if (bus == pbm->pci_first_busno) { - if (device == 0 && func == 0) - return 0; - return 1; + unsigned int val; + + val = (devhandle ^ (devhandle >> 4)); + val ^= bus; + val ^= device; + val ^= func; + + return val & PDEV_HTAB_MASK; +} + +static int pdev_htab_add(u32 devhandle, unsigned int bus, unsigned int device, unsigned int func) +{ + struct pdev_entry *p = kmalloc(sizeof(*p), GFP_KERNEL); + struct pdev_entry **slot; + + if (!p) + return -ENOMEM; + + slot = &pdev_htab[pdev_hashfn(devhandle, bus, device, func)]; + p->next = *slot; + *slot = p; + + p->devhandle = devhandle; + p->bus = bus; + p->device = device; + p->func = func; + + return 0; +} + +/* Recursively descend into the OBP device tree, rooted at toplevel_node, + * looking for a PCI device matching bus and devfn. + */ +static int obp_find(struct linux_prom_pci_registers *pregs, int toplevel_node, unsigned int bus, unsigned int devfn) +{ + toplevel_node = prom_getchild(toplevel_node); + + while (toplevel_node != 0) { + int ret = obp_find(pregs, toplevel_node, bus, devfn); + + if (ret != 0) + return ret; + + ret = prom_getproperty(toplevel_node, "reg", (char *) pregs, + sizeof(*pregs) * PROMREG_MAX); + if (ret == 0 || ret == -1) + goto next_sibling; + + if (((pregs[0].phys_hi >> 16) & 0xff) == bus && + ((pregs[0].phys_hi >> 8) & 0xff) == devfn) + break; + + next_sibling: + toplevel_node = prom_getsibling(toplevel_node); + } + + return toplevel_node; +} + +static int pdev_htab_populate(struct pci_pbm_info *pbm) +{ + struct linux_prom_pci_registers pr[PROMREG_MAX]; + u32 devhandle = pbm->devhandle; + unsigned int bus; + + for (bus = pbm->pci_first_busno; bus <= pbm->pci_last_busno; bus++) { + unsigned int devfn; + + for (devfn = 0; devfn < 256; devfn++) { + unsigned int device = PCI_SLOT(devfn); + unsigned int func = PCI_FUNC(devfn); + + if (obp_find(pr, pbm->prom_node, bus, devfn)) { + int err = pdev_htab_add(devhandle, bus, + device, func); + if (err) + return err; + } + } + } + + return 0; +} + +static struct pdev_entry *pdev_find(u32 devhandle, unsigned int bus, unsigned int device, unsigned int func) +{ + struct pdev_entry *p; + + p = pdev_htab[pdev_hashfn(devhandle, bus, device, func)]; + while (p) { + if (p->devhandle == devhandle && + p->bus == bus && + p->device == device && + p->func == func) + break; + + p = p->next; } + return p; +} + +static inline int pci_sun4v_out_of_range(struct pci_pbm_info *pbm, unsigned int bus, unsigned int device, unsigned int func) +{ if (bus < pbm->pci_first_busno || bus > pbm->pci_last_busno) return 1; - return 0; + return pdev_find(pbm->devhandle, bus, device, func) == NULL; } static int pci_sun4v_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn, @@ -1063,6 +1173,8 @@ static void pci_sun4v_pbm_init(struct pci_controller_info *p, int prom_node, u32 pci_sun4v_get_bus_range(pbm); pci_sun4v_iommu_init(pbm); + + pdev_htab_populate(pbm); } void sun4v_pci_init(int node, char *model_name) |