PCI/ACPI: Extend pci_mcfg_lookup() to return ECAM config accessors
pci_mcfg_lookup() is the external interface to the generic MCFG code. Previously it merely looked up the ECAM base address for a given domain and bus range. We want a way to add MCFG quirks, some of which may require special config accessors and adjustments to the ECAM address range. Extend pci_mcfg_lookup() so it can return a pointer to a pci_ecam_ops structure and a struct resource for the ECAM address space. For now, it always returns &pci_generic_ecam_ops (the standard accessor) and the resource described by the MCFG. No functional changes intended. [bhelgaas: changelog] Signed-off-by: Tomasz Nowicki <tn@semihalf.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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@ -137,25 +137,18 @@ pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
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struct device *dev = &root->device->dev;
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struct resource *bus_res = &root->secondary;
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u16 seg = root->segment;
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struct pci_ecam_ops *ecam_ops;
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struct resource cfgres;
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struct acpi_device *adev;
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struct pci_config_window *cfg;
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unsigned int bsz;
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int ret;
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/* Use address from _CBA if present, otherwise lookup MCFG */
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if (!root->mcfg_addr)
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root->mcfg_addr = pci_mcfg_lookup(seg, bus_res);
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if (!root->mcfg_addr) {
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ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
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if (ret) {
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dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res);
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return NULL;
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}
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bsz = 1 << pci_generic_ecam_ops.bus_shift;
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cfgres.start = root->mcfg_addr + bus_res->start * bsz;
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cfgres.end = cfgres.start + resource_size(bus_res) * bsz - 1;
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cfgres.flags = IORESOURCE_MEM;
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adev = acpi_resource_consumer(&cfgres);
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if (adev)
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dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres,
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@ -164,7 +157,7 @@ pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
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dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n",
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&cfgres);
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cfg = pci_ecam_create(dev, &cfgres, bus_res, &pci_generic_ecam_ops);
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cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
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if (IS_ERR(cfg)) {
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dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res,
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PTR_ERR(cfg));
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@ -22,6 +22,7 @@
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/pci-acpi.h>
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#include <linux/pci-ecam.h>
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/* Structure to hold entries from the MCFG table */
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struct mcfg_entry {
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@ -35,9 +36,18 @@ struct mcfg_entry {
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/* List to save MCFG entries */
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static LIST_HEAD(pci_mcfg_list);
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phys_addr_t pci_mcfg_lookup(u16 seg, struct resource *bus_res)
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int pci_mcfg_lookup(struct acpi_pci_root *root, struct resource *cfgres,
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struct pci_ecam_ops **ecam_ops)
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{
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struct pci_ecam_ops *ops = &pci_generic_ecam_ops;
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struct resource *bus_res = &root->secondary;
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u16 seg = root->segment;
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struct mcfg_entry *e;
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struct resource res;
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/* Use address from _CBA if present, otherwise lookup MCFG */
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if (root->mcfg_addr)
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goto skip_lookup;
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/*
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* We expect exact match, unless MCFG entry end bus covers more than
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@ -45,10 +55,22 @@ phys_addr_t pci_mcfg_lookup(u16 seg, struct resource *bus_res)
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*/
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list_for_each_entry(e, &pci_mcfg_list, list) {
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if (e->segment == seg && e->bus_start == bus_res->start &&
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e->bus_end >= bus_res->end)
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return e->addr;
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e->bus_end >= bus_res->end) {
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root->mcfg_addr = e->addr;
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}
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}
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if (!root->mcfg_addr)
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return -ENXIO;
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skip_lookup:
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memset(&res, 0, sizeof(res));
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res.start = root->mcfg_addr + (bus_res->start << 20);
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res.end = res.start + (resource_size(bus_res) << 20) - 1;
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res.flags = IORESOURCE_MEM;
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*cfgres = res;
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*ecam_ops = ops;
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return 0;
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}
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@ -24,7 +24,9 @@ static inline acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
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}
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extern phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle);
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extern phys_addr_t pci_mcfg_lookup(u16 domain, struct resource *bus_res);
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struct pci_ecam_ops;
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extern int pci_mcfg_lookup(struct acpi_pci_root *root, struct resource *cfgres,
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struct pci_ecam_ops **ecam_ops);
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static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev)
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{
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