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pci_mcfg.c
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pci_mcfg.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2016 Broadcom
* Author: Jayachandran C <[email protected]>
* Copyright (C) 2016 Semihalf
* Author: Tomasz Nowicki <[email protected]>
*/
#define pr_fmt(fmt) "ACPI: " fmt
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci-acpi.h>
#include <linux/pci-ecam.h>
/* Structure to hold entries from the MCFG table */
struct mcfg_entry {
struct list_head list;
phys_addr_t addr;
u16 segment;
u8 bus_start;
u8 bus_end;
};
#ifdef CONFIG_PCI_QUIRKS
struct mcfg_fixup {
char oem_id[ACPI_OEM_ID_SIZE + 1];
char oem_table_id[ACPI_OEM_TABLE_ID_SIZE + 1];
u32 oem_revision;
u16 segment;
struct resource bus_range;
const struct pci_ecam_ops *ops;
struct resource cfgres;
};
#define MCFG_BUS_RANGE(start, end) DEFINE_RES_NAMED((start), \
((end) - (start) + 1), \
NULL, IORESOURCE_BUS)
#define MCFG_BUS_ANY MCFG_BUS_RANGE(0x0, 0xff)
static struct mcfg_fixup mcfg_quirks[] = {
/* { OEM_ID, OEM_TABLE_ID, REV, SEGMENT, BUS_RANGE, ops, cfgres }, */
#ifdef CONFIG_ARM64
#define AL_ECAM(table_id, rev, seg, ops) \
{ "AMAZON", table_id, rev, seg, MCFG_BUS_ANY, ops }
AL_ECAM("GRAVITON", 0, 0, &al_pcie_ops),
AL_ECAM("GRAVITON", 0, 1, &al_pcie_ops),
AL_ECAM("GRAVITON", 0, 2, &al_pcie_ops),
AL_ECAM("GRAVITON", 0, 3, &al_pcie_ops),
AL_ECAM("GRAVITON", 0, 4, &al_pcie_ops),
AL_ECAM("GRAVITON", 0, 5, &al_pcie_ops),
AL_ECAM("GRAVITON", 0, 6, &al_pcie_ops),
AL_ECAM("GRAVITON", 0, 7, &al_pcie_ops),
#define QCOM_ECAM32(seg) \
{ "QCOM ", "QDF2432 ", 1, seg, MCFG_BUS_ANY, &pci_32b_ops }
QCOM_ECAM32(0),
QCOM_ECAM32(1),
QCOM_ECAM32(2),
QCOM_ECAM32(3),
QCOM_ECAM32(4),
QCOM_ECAM32(5),
QCOM_ECAM32(6),
QCOM_ECAM32(7),
#define HISI_QUAD_DOM(table_id, seg, ops) \
{ "HISI ", table_id, 0, (seg) + 0, MCFG_BUS_ANY, ops }, \
{ "HISI ", table_id, 0, (seg) + 1, MCFG_BUS_ANY, ops }, \
{ "HISI ", table_id, 0, (seg) + 2, MCFG_BUS_ANY, ops }, \
{ "HISI ", table_id, 0, (seg) + 3, MCFG_BUS_ANY, ops }
HISI_QUAD_DOM("HIP05 ", 0, &hisi_pcie_ops),
HISI_QUAD_DOM("HIP06 ", 0, &hisi_pcie_ops),
HISI_QUAD_DOM("HIP07 ", 0, &hisi_pcie_ops),
HISI_QUAD_DOM("HIP07 ", 4, &hisi_pcie_ops),
HISI_QUAD_DOM("HIP07 ", 8, &hisi_pcie_ops),
HISI_QUAD_DOM("HIP07 ", 12, &hisi_pcie_ops),
#define THUNDER_PEM_RES(addr, node) \
DEFINE_RES_MEM((addr) + ((u64) (node) << 44), 0x39 * SZ_16M)
#define THUNDER_PEM_QUIRK(rev, node) \
{ "CAVIUM", "THUNDERX", rev, 4 + (10 * (node)), MCFG_BUS_ANY, \
&thunder_pem_ecam_ops, THUNDER_PEM_RES(0x88001f000000UL, node) }, \
{ "CAVIUM", "THUNDERX", rev, 5 + (10 * (node)), MCFG_BUS_ANY, \
&thunder_pem_ecam_ops, THUNDER_PEM_RES(0x884057000000UL, node) }, \
{ "CAVIUM", "THUNDERX", rev, 6 + (10 * (node)), MCFG_BUS_ANY, \
&thunder_pem_ecam_ops, THUNDER_PEM_RES(0x88808f000000UL, node) }, \
{ "CAVIUM", "THUNDERX", rev, 7 + (10 * (node)), MCFG_BUS_ANY, \
&thunder_pem_ecam_ops, THUNDER_PEM_RES(0x89001f000000UL, node) }, \
{ "CAVIUM", "THUNDERX", rev, 8 + (10 * (node)), MCFG_BUS_ANY, \
&thunder_pem_ecam_ops, THUNDER_PEM_RES(0x894057000000UL, node) }, \
{ "CAVIUM", "THUNDERX", rev, 9 + (10 * (node)), MCFG_BUS_ANY, \
&thunder_pem_ecam_ops, THUNDER_PEM_RES(0x89808f000000UL, node) }
#define THUNDER_ECAM_QUIRK(rev, seg) \
{ "CAVIUM", "THUNDERX", rev, seg, MCFG_BUS_ANY, \
&pci_thunder_ecam_ops }
/* SoC pass2.x */
THUNDER_PEM_QUIRK(1, 0),
THUNDER_PEM_QUIRK(1, 1),
THUNDER_ECAM_QUIRK(1, 10),
/* SoC pass1.x */
THUNDER_PEM_QUIRK(2, 0), /* off-chip devices */
THUNDER_PEM_QUIRK(2, 1), /* off-chip devices */
THUNDER_ECAM_QUIRK(2, 0),
THUNDER_ECAM_QUIRK(2, 1),
THUNDER_ECAM_QUIRK(2, 2),
THUNDER_ECAM_QUIRK(2, 3),
THUNDER_ECAM_QUIRK(2, 10),
THUNDER_ECAM_QUIRK(2, 11),
THUNDER_ECAM_QUIRK(2, 12),
THUNDER_ECAM_QUIRK(2, 13),
{ "NVIDIA", "TEGRA194", 1, 0, MCFG_BUS_ANY, &tegra194_pcie_ops},
{ "NVIDIA", "TEGRA194", 1, 1, MCFG_BUS_ANY, &tegra194_pcie_ops},
{ "NVIDIA", "TEGRA194", 1, 2, MCFG_BUS_ANY, &tegra194_pcie_ops},
{ "NVIDIA", "TEGRA194", 1, 3, MCFG_BUS_ANY, &tegra194_pcie_ops},
{ "NVIDIA", "TEGRA194", 1, 4, MCFG_BUS_ANY, &tegra194_pcie_ops},
{ "NVIDIA", "TEGRA194", 1, 5, MCFG_BUS_ANY, &tegra194_pcie_ops},
#define XGENE_V1_ECAM_MCFG(rev, seg) \
{"APM ", "XGENE ", rev, seg, MCFG_BUS_ANY, \
&xgene_v1_pcie_ecam_ops }
#define XGENE_V2_ECAM_MCFG(rev, seg) \
{"APM ", "XGENE ", rev, seg, MCFG_BUS_ANY, \
&xgene_v2_pcie_ecam_ops }
/* X-Gene SoC with v1 PCIe controller */
XGENE_V1_ECAM_MCFG(1, 0),
XGENE_V1_ECAM_MCFG(1, 1),
XGENE_V1_ECAM_MCFG(1, 2),
XGENE_V1_ECAM_MCFG(1, 3),
XGENE_V1_ECAM_MCFG(1, 4),
XGENE_V1_ECAM_MCFG(2, 0),
XGENE_V1_ECAM_MCFG(2, 1),
XGENE_V1_ECAM_MCFG(2, 2),
XGENE_V1_ECAM_MCFG(2, 3),
XGENE_V1_ECAM_MCFG(2, 4),
/* X-Gene SoC with v2.1 PCIe controller */
XGENE_V2_ECAM_MCFG(3, 0),
XGENE_V2_ECAM_MCFG(3, 1),
/* X-Gene SoC with v2.2 PCIe controller */
XGENE_V2_ECAM_MCFG(4, 0),
XGENE_V2_ECAM_MCFG(4, 1),
XGENE_V2_ECAM_MCFG(4, 2),
#define ALTRA_ECAM_QUIRK(rev, seg) \
{ "Ampere", "Altra ", rev, seg, MCFG_BUS_ANY, &pci_32b_read_ops }
ALTRA_ECAM_QUIRK(1, 0),
ALTRA_ECAM_QUIRK(1, 1),
ALTRA_ECAM_QUIRK(1, 2),
ALTRA_ECAM_QUIRK(1, 3),
ALTRA_ECAM_QUIRK(1, 4),
ALTRA_ECAM_QUIRK(1, 5),
ALTRA_ECAM_QUIRK(1, 6),
ALTRA_ECAM_QUIRK(1, 7),
ALTRA_ECAM_QUIRK(1, 8),
ALTRA_ECAM_QUIRK(1, 9),
ALTRA_ECAM_QUIRK(1, 10),
ALTRA_ECAM_QUIRK(1, 11),
ALTRA_ECAM_QUIRK(1, 12),
ALTRA_ECAM_QUIRK(1, 13),
ALTRA_ECAM_QUIRK(1, 14),
ALTRA_ECAM_QUIRK(1, 15),
#endif /* ARM64 */
#ifdef CONFIG_LOONGARCH
#define LOONGSON_ECAM_MCFG(table_id, seg) \
{ "LOONGS", table_id, 1, seg, MCFG_BUS_ANY, &loongson_pci_ecam_ops }
LOONGSON_ECAM_MCFG("\0", 0),
LOONGSON_ECAM_MCFG("LOONGSON", 0),
LOONGSON_ECAM_MCFG("\0", 1),
LOONGSON_ECAM_MCFG("LOONGSON", 1),
#endif /* LOONGARCH */
};
static char mcfg_oem_id[ACPI_OEM_ID_SIZE];
static char mcfg_oem_table_id[ACPI_OEM_TABLE_ID_SIZE];
static u32 mcfg_oem_revision;
static int pci_mcfg_quirk_matches(struct mcfg_fixup *f, u16 segment,
struct resource *bus_range)
{
if (!memcmp(f->oem_id, mcfg_oem_id, ACPI_OEM_ID_SIZE) &&
!memcmp(f->oem_table_id, mcfg_oem_table_id,
ACPI_OEM_TABLE_ID_SIZE) &&
f->oem_revision == mcfg_oem_revision &&
f->segment == segment &&
resource_contains(&f->bus_range, bus_range))
return 1;
return 0;
}
#endif
static void pci_mcfg_apply_quirks(struct acpi_pci_root *root,
struct resource *cfgres,
const struct pci_ecam_ops **ecam_ops)
{
#ifdef CONFIG_PCI_QUIRKS
u16 segment = root->segment;
struct resource *bus_range = &root->secondary;
struct mcfg_fixup *f;
int i;
for (i = 0, f = mcfg_quirks; i < ARRAY_SIZE(mcfg_quirks); i++, f++) {
if (pci_mcfg_quirk_matches(f, segment, bus_range)) {
if (f->cfgres.start)
*cfgres = f->cfgres;
if (f->ops)
*ecam_ops = f->ops;
dev_info(&root->device->dev, "MCFG quirk: ECAM at %pR for %pR with %ps\n",
cfgres, bus_range, *ecam_ops);
return;
}
}
#endif
}
/* List to save MCFG entries */
static LIST_HEAD(pci_mcfg_list);
int pci_mcfg_lookup(struct acpi_pci_root *root, struct resource *cfgres,
const struct pci_ecam_ops **ecam_ops)
{
const struct pci_ecam_ops *ops = &pci_generic_ecam_ops;
struct resource *bus_res = &root->secondary;
u16 seg = root->segment;
struct mcfg_entry *e;
struct resource res;
/* Use address from _CBA if present, otherwise lookup MCFG */
if (root->mcfg_addr)
goto skip_lookup;
/*
* We expect the range in bus_res in the coverage of MCFG bus range.
*/
list_for_each_entry(e, &pci_mcfg_list, list) {
if (e->segment == seg && e->bus_start <= bus_res->start &&
e->bus_end >= bus_res->end) {
root->mcfg_addr = e->addr;
}
}
skip_lookup:
memset(&res, 0, sizeof(res));
if (root->mcfg_addr) {
res.start = root->mcfg_addr + (bus_res->start << 20);
res.end = res.start + (resource_size(bus_res) << 20) - 1;
res.flags = IORESOURCE_MEM;
}
/*
* Allow quirks to override default ECAM ops and CFG resource
* range. This may even fabricate a CFG resource range in case
* MCFG does not have it. Invalid CFG start address means MCFG
* firmware bug or we need another quirk in array.
*/
pci_mcfg_apply_quirks(root, &res, &ops);
if (!res.start)
return -ENXIO;
*cfgres = res;
*ecam_ops = ops;
return 0;
}
static __init int pci_mcfg_parse(struct acpi_table_header *header)
{
struct acpi_table_mcfg *mcfg;
struct acpi_mcfg_allocation *mptr;
struct mcfg_entry *e, *arr;
int i, n;
if (header->length < sizeof(struct acpi_table_mcfg))
return -EINVAL;
n = (header->length - sizeof(struct acpi_table_mcfg)) /
sizeof(struct acpi_mcfg_allocation);
mcfg = (struct acpi_table_mcfg *)header;
mptr = (struct acpi_mcfg_allocation *) &mcfg[1];
arr = kcalloc(n, sizeof(*arr), GFP_KERNEL);
if (!arr)
return -ENOMEM;
for (i = 0, e = arr; i < n; i++, mptr++, e++) {
e->segment = mptr->pci_segment;
e->addr = mptr->address;
e->bus_start = mptr->start_bus_number;
e->bus_end = mptr->end_bus_number;
list_add(&e->list, &pci_mcfg_list);
}
#ifdef CONFIG_PCI_QUIRKS
/* Save MCFG IDs and revision for quirks matching */
memcpy(mcfg_oem_id, header->oem_id, ACPI_OEM_ID_SIZE);
memcpy(mcfg_oem_table_id, header->oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
mcfg_oem_revision = header->oem_revision;
#endif
pr_info("MCFG table detected, %d entries\n", n);
return 0;
}
/* Interface called by ACPI - parse and save MCFG table */
void __init pci_mmcfg_late_init(void)
{
int err = acpi_table_parse(ACPI_SIG_MCFG, pci_mcfg_parse);
if (err)
pr_debug("Failed to parse MCFG (%d)\n", err);
}