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It is the responsibility of the EPF driver to pass the actual message data to be written by the host to the doorbell BAR region through its own logic. Tested-by: Niklas Cassel Signed-off-by: Frank Li --- Change from v12 to v13 - Use DOMAIN_BUS_DEVICE_PCI_EP_MSI Change from v10 to v12 - none Change from v9 to v10 - Create msi domain for each function device. - Remove only function support limiation. My hardware only support one function, so not test more than one case. - use "msi-map" descript msi information msi-map = ; Chagne from v8 to v9 - sort header file - use pci_epc_get(dev_name(msi_desc_to_dev(desc))); - check epf number at pci_epf_alloc_doorbell - Add comments for miss msi-parent case change from v5 to v8 -none Change from v4 to v5 - Remove request_irq() in pci_epc_alloc_doorbell() and leave to EP function driver, so ep function driver can register differece call back function for difference doorbell events and set irq affinity to differece CPU core. - Improve error message when MSI allocate failure. Change from v3 to v4 - msi change to use msi_get_virq() avoid use msi_for_each_desc(). - add new struct for pci_epf_doorbell_msg to msi msg,virq and irq name. - move mutex lock to epc function - initialize variable at declear place. - passdown epf to epc*() function to simplify code. --- drivers/pci/endpoint/pci-ep-msi.c | 104 ++++++++++++++++++++++++++++++++++++++ include/linux/pci-ep-msi.h | 5 ++ include/linux/pci-epf.h | 16 ++++++ 3 files changed, 125 insertions(+) diff --git a/drivers/pci/endpoint/pci-ep-msi.c b/drivers/pci/endpoint/pci-ep-msi.c index 7aedc1cafbd14..33503d86cf2bc 100644 --- a/drivers/pci/endpoint/pci-ep-msi.c +++ b/drivers/pci/endpoint/pci-ep-msi.c @@ -34,3 +34,107 @@ int pci_epf_msi_domain_get_msi_rid(struct device *dev, u32 *rid) return 0; } EXPORT_SYMBOL_GPL(pci_epf_msi_domain_get_msi_rid); + +static void pci_epf_write_msi_msg(struct irq_data *d, struct msi_msg *msg) +{ + struct msi_desc *desc = irq_data_get_msi_desc(d); + struct pci_epf *epf = to_pci_epf(desc->dev); + + if (epf && epf->db_msg && desc->msi_index < epf->num_db) + memcpy(&epf->db_msg[desc->msi_index].msg, msg, sizeof(*msg)); +} + +static void pci_epf_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc) +{ + arg->desc = desc; + arg->hwirq = desc->msi_index; +} + +static const struct msi_domain_template pci_epf_msi_template = { + .chip = { + .name = "EP-MSI", + .irq_mask = irq_chip_mask_parent, + .irq_unmask = irq_chip_unmask_parent, + .irq_write_msi_msg = pci_epf_write_msi_msg, + /* The rest is filled in by the MSI parent */ + }, + + .ops = { + .set_desc = pci_epf_msi_set_desc, + }, + + .info = { + .bus_token = DOMAIN_BUS_DEVICE_PCI_EP_MSI, + }, +}; + +static int pci_epf_device_msi_init_and_alloc_irqs(struct device *dev, unsigned int nvec) +{ + struct irq_domain *domain = dev->msi.domain; + + if (!domain) + return -EINVAL; + + if (!msi_create_device_irq_domain(dev, MSI_DEFAULT_DOMAIN, + &pci_epf_msi_template, nvec, NULL, NULL)) + return -ENODEV; + + return msi_domain_alloc_irqs_range(dev, MSI_DEFAULT_DOMAIN, 0, nvec - 1); +} + +int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 num_db) +{ + struct pci_epc *epc = epf->epc; + struct device *dev = &epf->dev; + struct irq_domain *dom; + void *msg; + u32 rid; + int ret; + int i; + + rid = (epf->func_no & 0x7) | (epf->vfunc_no << 3); + dom = of_msi_map_get_device_domain(epc->dev.parent, rid, DOMAIN_BUS_PLATFORM_PCI_EP_MSI); + if (!dom) { + dev_err(dev, "Can't find msi domain\n"); + return -EINVAL; + } + + dev_set_msi_domain(dev, dom); + + msg = kcalloc(num_db, sizeof(struct pci_epf_doorbell_msg), GFP_KERNEL); + if (!msg) + return -ENOMEM; + + epf->num_db = num_db; + epf->db_msg = msg; + + ret = pci_epf_device_msi_init_and_alloc_irqs(dev, num_db); + if (ret) { + /* + * The pcie_ep DT node has to specify 'msi-parent' for EP + * doorbell support to work. Right now only GIC ITS is + * supported. If you have GIC ITS and reached this print, + * perhaps you are missing 'msi-map' in DT. + */ + dev_err(dev, "Failed to allocate MSI\n"); + kfree(msg); + return -ENOMEM; + } + + for (i = 0; i < num_db; i++) + epf->db_msg[i].virq = msi_get_virq(dev, i); + + return ret; +} +EXPORT_SYMBOL_GPL(pci_epf_alloc_doorbell); + +void pci_epf_free_doorbell(struct pci_epf *epf) +{ + msi_domain_free_irqs_all(&epf->dev, MSI_DEFAULT_DOMAIN); + msi_remove_device_irq_domain(&epf->dev, MSI_DEFAULT_DOMAIN); + + kfree(epf->db_msg); + epf->db_msg = NULL; + epf->num_db = 0; +} +EXPORT_SYMBOL_GPL(pci_epf_free_doorbell); diff --git a/include/linux/pci-ep-msi.h b/include/linux/pci-ep-msi.h index 75236867426a4..26b1c86893ee4 100644 --- a/include/linux/pci-ep-msi.h +++ b/include/linux/pci-ep-msi.h @@ -18,4 +18,9 @@ static inline int pci_epf_msi_domain_get_msi_rid(struct device *dev, u32 *rid) } #endif +struct pci_epf; + +int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 nums); +void pci_epf_free_doorbell(struct pci_epf *epf); + #endif /* __PCI_EP_MSI__ */ diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h index 18a3aeb62ae4e..5374e6515ffa0 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -12,6 +12,7 @@ #include #include #include +#include #include struct pci_epf; @@ -125,6 +126,17 @@ struct pci_epf_bar { int flags; }; +/** + * struct pci_epf_doorbell_msg - represents doorbell message + * @msi_msg: MSI message + * @virq: irq number of this doorbell MSI message + * @name: irq name for doorbell interrupt + */ +struct pci_epf_doorbell_msg { + struct msi_msg msg; + int virq; +}; + /** * struct pci_epf - represents the PCI EPF device * @dev: the PCI EPF device @@ -152,6 +164,8 @@ struct pci_epf_bar { * @vfunction_num_map: bitmap to manage virtual function number * @pci_vepf: list of virtual endpoint functions associated with this function * @event_ops: Callbacks for capturing the EPC events + * @db_msg: data for MSI from RC side + * @num_db: number of doorbells */ struct pci_epf { struct device dev; @@ -182,6 +196,8 @@ struct pci_epf { unsigned long vfunction_num_map; struct list_head pci_vepf; const struct pci_epc_event_ops *event_ops; + struct pci_epf_doorbell_msg *db_msg; + u16 num_db; }; /**