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PCI: endpoint: Add new pci_epc_ops to get EPC features

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Add a new pci_epc_ops ->get_features() to get the features
supported by the EPC. Since EPC can provide different features to
different functions, the ->get_features() ops takes _func_no_ as
an argument.

Tested-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Kishon Vijay Abraham I 2019-01-14 16:44:59 +05:30 committed by Lorenzo Pieralisi
parent 726dabfde6
commit 41cb8d189c
2 changed files with 52 additions and 0 deletions
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30
drivers/pci/endpoint/pci-epc-core.c
View file

@ -83,6 +83,36 @@ struct pci_epc *pci_epc_get(const char *epc_name)
}
EXPORT_SYMBOL_GPL(pci_epc_get);
/**
* pci_epc_get_features() - get the features supported by EPC
* @epc: the features supported by *this* EPC device will be returned
* @func_no: the features supported by the EPC device specific to the
* endpoint function with func_no will be returned
*
* Invoke to get the features provided by the EPC which may be
* specific to an endpoint function. Returns pci_epc_features on success
* and NULL for any failures.
*/
const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
u8 func_no)
{
const struct pci_epc_features *epc_features;
unsigned long flags;
if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
return NULL;
if (!epc->ops->get_features)
return NULL;
spin_lock_irqsave(&epc->lock, flags);
epc_features = epc->ops->get_features(epc, func_no);
spin_unlock_irqrestore(&epc->lock, flags);
return epc_features;
}
EXPORT_SYMBOL_GPL(pci_epc_get_features);
/**
* pci_epc_stop() - stop the PCI link
* @epc: the link of the EPC device that has to be stopped

22
include/linux/pci-epc.h
View file

@ -59,6 +59,8 @@ struct pci_epc_ops {
enum pci_epc_irq_type type, u16 interrupt_num);
int (*start)(struct pci_epc *epc);
void (*stop)(struct pci_epc *epc);
const struct pci_epc_features* (*get_features)(struct pci_epc *epc,
u8 func_no);
struct module *owner;
};
@ -100,6 +102,24 @@ struct pci_epc {
unsigned int features;
};
/**
* struct pci_epc_features - features supported by a EPC device per function
* @linkup_notifier: indicate if the EPC device can notify EPF driver on link up
* @msi_capable: indicate if the endpoint function has MSI capability
* @msix_capable: indicate if the endpoint function has MSI-X capability
* @reserved_bar: bitmap to indicate reserved BAR unavailable to function driver
* @bar_fixed_64bit: bitmap to indicate fixed 64bit BARs
* @bar_fixed_size: Array specifying the size supported by each BAR
*/
struct pci_epc_features {
unsigned int linkup_notifier : 1;
unsigned int msi_capable : 1;
unsigned int msix_capable : 1;
u8 reserved_bar;
u8 bar_fixed_64bit;
u64 bar_fixed_size[BAR_5 + 1];
};
#define EPC_FEATURE_NO_LINKUP_NOTIFIER BIT(0)
#define EPC_FEATURE_BAR_MASK (BIT(1) | BIT(2) | BIT(3))
#define EPC_FEATURE_MSIX_AVAILABLE BIT(4)
@ -158,6 +178,8 @@ int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
enum pci_epc_irq_type type, u16 interrupt_num);
int pci_epc_start(struct pci_epc *epc);
void pci_epc_stop(struct pci_epc *epc);
const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
u8 func_no);
struct pci_epc *pci_epc_get(const char *epc_name);
void pci_epc_put(struct pci_epc *epc);