powerpc/powernv: Enable M64 aperatus for PHB3

This patch enables M64 aperatus for PHB3.

We already had platform hook (ppc_md.pcibios_window_alignment) to affect
the PCI resource assignment done in PCI core so that each PE's M32 resource
was built on basis of M32 segment size. Similarly, we're using that for
M64 assignment on basis of M64 segment size.

   * We're using last M64 BAR to cover M64 aperatus, and it's shared by all
     256 PEs.
   * We don't support P7IOC yet. However, some function callbacks are added
     to (struct pnv_phb) so that we can reuse them on P7IOC in future.
   * PE, corresponding to PCI bus with large M64 BAR device attached, might
     span multiple M64 segments. We introduce "compound" PE to cover the case.
     The compound PE is a list of PEs and the master PE is used as before.
     The slave PEs are just for MMIO isolation.

Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
index 6f5ff6921dab..49da9f154950 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -21,6 +21,8 @@ enum pnv_phb_model {
 #define PNV_IODA_PE_DEV		(1 << 0)	/* PE has single PCI device	*/
 #define PNV_IODA_PE_BUS		(1 << 1)	/* PE has primary PCI bus	*/
 #define PNV_IODA_PE_BUS_ALL	(1 << 2)	/* PE has subordinate buses	*/
+#define PNV_IODA_PE_MASTER	(1 << 3)	/* Master PE in compound case	*/
+#define PNV_IODA_PE_SLAVE	(1 << 4)	/* Slave PE in compound case	*/
 
 /* Data associated with a PE, including IOMMU tracking etc.. */
 struct pnv_phb;
@@ -64,6 +66,10 @@ struct pnv_ioda_pe {
 	 */
 	int			mve_number;
 
+	/* PEs in compound case */
+	struct pnv_ioda_pe	*master;
+	struct list_head	slaves;
+
 	/* Link in list of PE#s */
 	struct list_head	dma_link;
 	struct list_head	list;
@@ -119,6 +125,9 @@ struct pnv_phb {
 	void (*fixup_phb)(struct pci_controller *hose);
 	u32 (*bdfn_to_pe)(struct pnv_phb *phb, struct pci_bus *bus, u32 devfn);
 	void (*shutdown)(struct pnv_phb *phb);
+	int (*init_m64)(struct pnv_phb *phb);
+	void (*alloc_m64_pe)(struct pnv_phb *phb);
+	int (*pick_m64_pe)(struct pnv_phb *phb, struct pci_bus *bus, int all);
 
 	union {
 		struct {
@@ -129,9 +138,20 @@ struct pnv_phb {
 			/* Global bridge info */
 			unsigned int		total_pe;
 			unsigned int		reserved_pe;
+
+			/* 32-bit MMIO window */
 			unsigned int		m32_size;
 			unsigned int		m32_segsize;
 			unsigned int		m32_pci_base;
+
+			/* 64-bit MMIO window */
+			unsigned int		m64_bar_idx;
+			unsigned long		m64_size;
+			unsigned long		m64_segsize;
+			unsigned long		m64_base;
+			unsigned long		m64_bar_alloc;
+
+			/* IO ports */
 			unsigned int		io_size;
 			unsigned int		io_segsize;
 			unsigned int		io_pci_base;