Merge branch 'pci/endpoint'

- Make pci_epf_bus_type const (Ricardo B. Marliere)

- Update pci_epf_alloc_space() interface and move bar_fixed_size[] testing
  from pci_epf_test_alloc_space() and pci_epf_configure_bar() into it
  (Niklas Cassel)

- Drop redundant size & alignment checking from epf_ntb_db_bar_init() since
  pci_epf_alloc_space() already does it (Niklas Cassel)

- Fix ntb_register_device() name leak in error path (Yang Yingliang)

- Return actual error code for pci_vntb_probe() failure (Yang Yingliang)

- Prefix sysfs function names with "pci_epf_mhi_", e.g.,
  "/sys/kernel/config/functions/pci_epf_mhi_sdx55", to leave room for other
  endpoint functions (Manivannan Sadhasivam)

- Add EPF MHI support for SA8775P SoC (Mrinmay Sarkar)

- Consolidate endpoint BAR hardware description in new struct
  pci_epc_bar_desc (Niklas Cassel)

- Drop only_64bit on reserved BARs (Niklas Cassel)

* pci/endpoint:
  PCI: endpoint: Drop only_64bit on reserved BARs
  PCI: endpoint: Clean up hardware description for BARs
  PCI: epf-mhi: Add support for SA8775P SoC
  PCI: epf-mhi: Add "pci_epf_mhi_" prefix to the function names
  PCI: epf-vntb: Return actual error code during pci_vntb_probe() failure
  NTB: fix possible name leak in ntb_register_device()
  PCI: endpoint: pci-epf-vntb: Remove superfluous checks for pci_epf_alloc_space() API
  PCI: endpoint: pci-epf-test: Remove superfluous checks for pci_epf_alloc_space() API
  PCI: endpoint: Improve pci_epf_alloc_space() API
  PCI: endpoint: Refactor pci_epf_alloc_space() API
  PCI: endpoint: Make pci_epf_bus_type const

2 files changed, 36 insertions, 7 deletions

diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 40ea18f5aa02..cc2f70d061c8 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -146,15 +146,44 @@ struct pci_epc {
 };
 
 /**
+ * @BAR_PROGRAMMABLE: The BAR mask can be configured by the EPC.
+ * @BAR_FIXED: The BAR mask is fixed by the hardware.
+ * @BAR_RESERVED: The BAR should not be touched by an EPF driver.
+ */
+enum pci_epc_bar_type {
+	BAR_PROGRAMMABLE = 0,
+	BAR_FIXED,
+	BAR_RESERVED,
+};
+
+/**
+ * struct pci_epc_bar_desc - hardware description for a BAR
+ * @type: the type of the BAR
+ * @fixed_size: the fixed size, only applicable if type is BAR_FIXED_MASK.
+ * @only_64bit: if true, an EPF driver is not allowed to choose if this BAR
+ *		should be configured as 32-bit or 64-bit, the EPF driver must
+ *		configure this BAR as 64-bit. Additionally, the BAR succeeding
+ *		this BAR must be set to type BAR_RESERVED.
+ *
+ *		only_64bit should not be set on a BAR of type BAR_RESERVED.
+ *		(If BARx is a 64-bit BAR that an EPF driver is not allowed to
+ *		touch, then both BARx and BARx+1 must be set to type
+ *		BAR_RESERVED.)
+ */
+struct pci_epc_bar_desc {
+	enum pci_epc_bar_type type;
+	u64 fixed_size;
+	bool only_64bit;
+};
+
+/**
  * 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
  * @core_init_notifier: indicate cores that can notify about their availability
  *			for initialization
  * @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
+ * @bar: array specifying the hardware description for each BAR
  * @align: alignment size required for BAR buffer allocation
  */
 struct pci_epc_features {
@@ -162,9 +191,7 @@ struct pci_epc_features {
 	unsigned int	core_init_notifier : 1;
 	unsigned int	msi_capable : 1;
 	unsigned int	msix_capable : 1;
-	u8	reserved_bar;
-	u8	bar_fixed_64bit;
-	u64	bar_fixed_size[PCI_STD_NUM_BARS];
+	struct	pci_epc_bar_desc bar[PCI_STD_NUM_BARS];
 	size_t	align;
 };
 
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index 77b146e0f672..adee6a1b35db 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -15,6 +15,7 @@
 #include <linux/pci.h>
 
 struct pci_epf;
+struct pci_epc_features;
 enum pci_epc_interface_type;
 
 enum pci_barno {
@@ -216,7 +217,8 @@ int __pci_epf_register_driver(struct pci_epf_driver *driver,
 			      struct module *owner);
 void pci_epf_unregister_driver(struct pci_epf_driver *driver);
 void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar,
-			  size_t align, enum pci_epc_interface_type type);
+			  const struct pci_epc_features *epc_features,
+			  enum pci_epc_interface_type type);
 void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar,
 			enum pci_epc_interface_type type);
 int pci_epf_bind(struct pci_epf *epf);