diff options
Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r-- | drivers/pci/pci.c | 201 |
1 files changed, 200 insertions, 1 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 09b4a35e21a8..2b28a4e77ea4 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -27,6 +27,7 @@ #include <linux/pci_hotplug.h> #include <asm-generic/pci-bridge.h> #include <asm/setup.h> +#include <linux/aer.h> #include "pci.h" const char *pci_power_names[] = { @@ -508,7 +509,7 @@ int pci_wait_for_pending(struct pci_dev *dev, int pos, u16 mask) } /** - * pci_restore_bars - restore a devices BAR values (e.g. after wake-up) + * pci_restore_bars - restore a device's BAR values (e.g. after wake-up) * @dev: PCI device to have its BARs restored * * Restore the BAR values for a given device, so as to make it @@ -518,6 +519,10 @@ static void pci_restore_bars(struct pci_dev *dev) { int i; + /* Per SR-IOV spec 3.4.1.11, VF BARs are RO zero */ + if (dev->is_virtfn) + return; + for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) pci_update_resource(dev, i); } @@ -1123,6 +1128,8 @@ void pci_restore_state(struct pci_dev *dev) pci_restore_ats_state(dev); pci_restore_vc_state(dev); + pci_cleanup_aer_error_status_regs(dev); + pci_restore_config_space(dev); pci_restore_pcix_state(dev); @@ -2172,6 +2179,198 @@ void pci_pm_init(struct pci_dev *dev) } } +static unsigned long pci_ea_flags(struct pci_dev *dev, u8 prop) +{ + unsigned long flags = IORESOURCE_PCI_FIXED; + + switch (prop) { + case PCI_EA_P_MEM: + case PCI_EA_P_VF_MEM: + flags |= IORESOURCE_MEM; + break; + case PCI_EA_P_MEM_PREFETCH: + case PCI_EA_P_VF_MEM_PREFETCH: + flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH; + break; + case PCI_EA_P_IO: + flags |= IORESOURCE_IO; + break; + default: + return 0; + } + + return flags; +} + +static struct resource *pci_ea_get_resource(struct pci_dev *dev, u8 bei, + u8 prop) +{ + if (bei <= PCI_EA_BEI_BAR5 && prop <= PCI_EA_P_IO) + return &dev->resource[bei]; +#ifdef CONFIG_PCI_IOV + else if (bei >= PCI_EA_BEI_VF_BAR0 && bei <= PCI_EA_BEI_VF_BAR5 && + (prop == PCI_EA_P_VF_MEM || prop == PCI_EA_P_VF_MEM_PREFETCH)) + return &dev->resource[PCI_IOV_RESOURCES + + bei - PCI_EA_BEI_VF_BAR0]; +#endif + else if (bei == PCI_EA_BEI_ROM) + return &dev->resource[PCI_ROM_RESOURCE]; + else + return NULL; +} + +/* Read an Enhanced Allocation (EA) entry */ +static int pci_ea_read(struct pci_dev *dev, int offset) +{ + struct resource *res; + int ent_size, ent_offset = offset; + resource_size_t start, end; + unsigned long flags; + u32 dw0, bei, base, max_offset; + u8 prop; + bool support_64 = (sizeof(resource_size_t) >= 8); + + pci_read_config_dword(dev, ent_offset, &dw0); + ent_offset += 4; + + /* Entry size field indicates DWORDs after 1st */ + ent_size = ((dw0 & PCI_EA_ES) + 1) << 2; + + if (!(dw0 & PCI_EA_ENABLE)) /* Entry not enabled */ + goto out; + + bei = (dw0 & PCI_EA_BEI) >> 4; + prop = (dw0 & PCI_EA_PP) >> 8; + + /* + * If the Property is in the reserved range, try the Secondary + * Property instead. + */ + if (prop > PCI_EA_P_BRIDGE_IO && prop < PCI_EA_P_MEM_RESERVED) + prop = (dw0 & PCI_EA_SP) >> 16; + if (prop > PCI_EA_P_BRIDGE_IO) + goto out; + + res = pci_ea_get_resource(dev, bei, prop); + if (!res) { + dev_err(&dev->dev, "Unsupported EA entry BEI: %u\n", bei); + goto out; + } + + flags = pci_ea_flags(dev, prop); + if (!flags) { + dev_err(&dev->dev, "Unsupported EA properties: %#x\n", prop); + goto out; + } + + /* Read Base */ + pci_read_config_dword(dev, ent_offset, &base); + start = (base & PCI_EA_FIELD_MASK); + ent_offset += 4; + + /* Read MaxOffset */ + pci_read_config_dword(dev, ent_offset, &max_offset); + ent_offset += 4; + + /* Read Base MSBs (if 64-bit entry) */ + if (base & PCI_EA_IS_64) { + u32 base_upper; + + pci_read_config_dword(dev, ent_offset, &base_upper); + ent_offset += 4; + + flags |= IORESOURCE_MEM_64; + + /* entry starts above 32-bit boundary, can't use */ + if (!support_64 && base_upper) + goto out; + + if (support_64) + start |= ((u64)base_upper << 32); + } + + end = start + (max_offset | 0x03); + + /* Read MaxOffset MSBs (if 64-bit entry) */ + if (max_offset & PCI_EA_IS_64) { + u32 max_offset_upper; + + pci_read_config_dword(dev, ent_offset, &max_offset_upper); + ent_offset += 4; + + flags |= IORESOURCE_MEM_64; + + /* entry too big, can't use */ + if (!support_64 && max_offset_upper) + goto out; + + if (support_64) + end += ((u64)max_offset_upper << 32); + } + + if (end < start) { + dev_err(&dev->dev, "EA Entry crosses address boundary\n"); + goto out; + } + + if (ent_size != ent_offset - offset) { + dev_err(&dev->dev, + "EA Entry Size (%d) does not match length read (%d)\n", + ent_size, ent_offset - offset); + goto out; + } + + res->name = pci_name(dev); + res->start = start; + res->end = end; + res->flags = flags; + + if (bei <= PCI_EA_BEI_BAR5) + dev_printk(KERN_DEBUG, &dev->dev, "BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n", + bei, res, prop); + else if (bei == PCI_EA_BEI_ROM) + dev_printk(KERN_DEBUG, &dev->dev, "ROM: %pR (from Enhanced Allocation, properties %#02x)\n", + res, prop); + else if (bei >= PCI_EA_BEI_VF_BAR0 && bei <= PCI_EA_BEI_VF_BAR5) + dev_printk(KERN_DEBUG, &dev->dev, "VF BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n", + bei - PCI_EA_BEI_VF_BAR0, res, prop); + else + dev_printk(KERN_DEBUG, &dev->dev, "BEI %d res: %pR (from Enhanced Allocation, properties %#02x)\n", + bei, res, prop); + +out: + return offset + ent_size; +} + +/* Enhanced Allocation Initalization */ +void pci_ea_init(struct pci_dev *dev) +{ + int ea; + u8 num_ent; + int offset; + int i; + + /* find PCI EA capability in list */ + ea = pci_find_capability(dev, PCI_CAP_ID_EA); + if (!ea) + return; + + /* determine the number of entries */ + pci_bus_read_config_byte(dev->bus, dev->devfn, ea + PCI_EA_NUM_ENT, + &num_ent); + num_ent &= PCI_EA_NUM_ENT_MASK; + + offset = ea + PCI_EA_FIRST_ENT; + + /* Skip DWORD 2 for type 1 functions */ + if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) + offset += 4; + + /* parse each EA entry */ + for (i = 0; i < num_ent; ++i) + offset = pci_ea_read(dev, offset); +} + static void pci_add_saved_cap(struct pci_dev *pci_dev, struct pci_cap_saved_state *new_cap) { |