From: David Daney <david.daney@xxxxxxxxxx> The PCISIG recently added the Enhanced Allocation Capability. Decode it in lspci. --- The specification is currently located here: https://pcisig.com/sites/default/files/specification_documents/ECN_Enhanced_Allocation_23_Oct_2014_Final.pdf Bjorn Helgaas recently merged Linux kernel support for EA, and Cavium ThunderX processors have implemented it. This patch gives us a pretty view of the capability structure. Thanks, David Daney lib/header.h | 1 + ls-caps.c | 142 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 143 insertions(+) diff --git a/lib/header.h b/lib/header.h index f7cdee7..8c80e45 100644 --- a/lib/header.h +++ b/lib/header.h @@ -203,6 +203,7 @@ #define PCI_CAP_ID_MSIX 0x11 /* MSI-X */ #define PCI_CAP_ID_SATA 0x12 /* Serial-ATA HBA */ #define PCI_CAP_ID_AF 0x13 /* Advanced features of PCI devices integrated in PCIe root cplx */ +#define PCI_CAP_ID_EA 0x14 /* Enhanced Allocation */ #define PCI_CAP_LIST_NEXT 1 /* Next capability in the list */ #define PCI_CAP_FLAGS 2 /* Capability defined flags (16 bits) */ #define PCI_CAP_SIZEOF 4 diff --git a/ls-caps.c b/ls-caps.c index c145ed6..dec47f4 100644 --- a/ls-caps.c +++ b/ls-caps.c @@ -1254,6 +1254,145 @@ cap_sata_hba(struct device *d, int where, int cap) printf(" BAR??%d\n", bar); } +static const char *cap_ea_property(unsigned p) +{ + switch (p) { + case 0x00: + return "memory space, non-prefetchable"; + case 0x01: + return "memory space, prefetchable"; + case 0x02: + return "I/O space"; + case 0x03: + return "VF memory space, prefetchable"; + case 0x04: + return "VF memory space, non-prefetchable"; + case 0x05: + return "allocation behind bridge, non-prefetchable memory"; + case 0x06: + return "allocation behind bridge, prefetchable memory"; + case 0x07: + return "allocation behind bridge, I/O space"; + case 0xfd: + return "memory space resource unavailable for use"; + case 0xfe: + return "I/O space resource unavailable for use"; + case 0xff: + return "entry unavailable for use"; + default: + return "reserved"; + } +} + +static void cap_ea(struct device *d, int where, int cap) +{ + unsigned int entry; + int entry_base = where + 4; + unsigned int num_entries = BITS((unsigned int)cap, 0, 6); + u8 htype = get_conf_byte(d, PCI_HEADER_TYPE) & 0x7f; + + printf("Enhanced Allocation: Num Entries=%u", num_entries); + if (htype == PCI_HEADER_TYPE_BRIDGE) { + byte fixed_sub, fixed_sec; + + entry_base += 4; + if (!config_fetch(d, where + 4, 2)) { + printf("\n"); + return; + } + fixed_sec = get_conf_byte(d, where + 4); + fixed_sub = get_conf_byte(d, where + 4); + printf(", secondary=%d, subordinate=%d", fixed_sec, fixed_sub); + } + printf("\n"); + if (verbose < 2) + return; + + for (entry = 0; entry < num_entries; entry++) { + int max_offset_high_pos, has_base_high, has_max_offset_high; + u32 entry_header; + u32 base, max_offset; + unsigned int es, bei, pp, sp, e, w; + + if (!config_fetch(d, entry_base, 4)) + return; + entry_header = get_conf_long(d, entry_base); + es = BITS(entry_header, 0, 3); + bei = BITS(entry_header, 4, 4); + pp = BITS(entry_header, 8, 8); + sp = BITS(entry_header, 16, 8); + w = BITS(entry_header, 30, 1); + e = BITS(entry_header, 31, 1); + if (!config_fetch(d, entry_base + 4, es * 4)) + return; + printf("\t\tEntry-%u: Enable%c Writable%c, Entry Size=%u\n", entry, + e ? '+': '-', + w ? '+': '-', es); + printf("\t\t\t BAR Equivalent Indicator (BEI): "); + switch (bei) { + case 0: + case 1: + case 2: + case 3: + case 4: + case 5: + printf("BAR%u", bei); + break; + case 6: + printf("Resource behind function"); + break; + case 7: + printf("Not Indicated"); + break; + case 8: + printf("Expansion ROM"); + break; + case 9: + case 10: + case 11: + case 12: + case 13: + case 14: + printf("VF-BAR%u", bei - 9); + break; + default: + printf("Reserved"); + break; + } + printf("\n"); + printf("\t\t\t Primary Properties (PP): %s\n", cap_ea_property(pp)); + printf("\t\t\t Secondary Properties (SP): %s\n", cap_ea_property(sp)); + + base = get_conf_long(d, entry_base + 4); + has_base_high = ((base & 2) != 0); + base &= ~3; + + max_offset = get_conf_long(d, entry_base + 8); + has_max_offset_high = ((max_offset & 2) != 0); + max_offset |= 3; + max_offset_high_pos = entry_base + 12; + + printf("\t\t\t Base: "); + if (has_base_high) { + u32 base_high = get_conf_long(d, entry_base + 12); + + printf("%x", base_high); + max_offset_high_pos += 4; + } + printf("%08x\n", base); + + printf("\t\t\t Max Offset: "); + if (has_max_offset_high) { + u32 max_offset_high = get_conf_long(d, max_offset_high_pos); + + printf("%x", max_offset_high); + } + printf("%08x\n", max_offset); + + entry_base += 4 + 4 * es; + } +} + void show_caps(struct device *d, int where) { @@ -1348,6 +1487,9 @@ show_caps(struct device *d, int where) case PCI_CAP_ID_AF: cap_af(d, where); break; + case PCI_CAP_ID_EA: + cap_ea(d, where, cap); + break; default: printf("#%02x [%04x]\n", id, cap); } -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
