s390/pci: provide support for MIO instructions

Provide support for PCI I/O instructions that work on mapped IO addresses.

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

4 files changed, 28 insertions, 11 deletions

diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h
index f34d729347e4..ca421614722f 100644
--- a/arch/s390/include/asm/io.h
+++ b/arch/s390/include/asm/io.h
@@ -30,14 +30,8 @@ void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
 #define ioremap_wc			ioremap_nocache
 #define ioremap_wt			ioremap_nocache
 
-static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
-{
-	return (void __iomem *) offset;
-}
-
-static inline void iounmap(volatile void __iomem *addr)
-{
-}
+void __iomem *ioremap(unsigned long offset, unsigned long size);
+void iounmap(volatile void __iomem *addr);
 
 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
 {
@@ -57,14 +51,17 @@ static inline void ioport_unmap(void __iomem *p)
  * the corresponding device and create the mapping cookie.
  */
 #define pci_iomap pci_iomap
+#define pci_iomap_range pci_iomap_range
 #define pci_iounmap pci_iounmap
-#define pci_iomap_wc pci_iomap
-#define pci_iomap_wc_range pci_iomap_range
+#define pci_iomap_wc pci_iomap_wc
+#define pci_iomap_wc_range pci_iomap_wc_range
 
 #define memcpy_fromio(dst, src, count)	zpci_memcpy_fromio(dst, src, count)
 #define memcpy_toio(dst, src, count)	zpci_memcpy_toio(dst, src, count)
 #define memset_io(dst, val, count)	zpci_memset_io(dst, val, count)
 
+#define mmiowb()	zpci_barrier()
+
 #define __raw_readb	zpci_read_u8
 #define __raw_readw	zpci_read_u16
 #define __raw_readl	zpci_read_u32
diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index 328013219aec..305befd55326 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -86,6 +86,8 @@ enum zpci_state {
 
 struct zpci_bar_struct {
 	struct resource *res;		/* bus resource */
+	void __iomem	*mio_wb;
+	void __iomem	*mio_wt;
 	u32		val;		/* bar start & 3 flag bits */
 	u16		map_idx;	/* index into bar mapping array */
 	u8		size;		/* order 2 exponent */
@@ -135,6 +137,7 @@ struct zpci_dev {
 	struct iommu_device iommu_dev;  /* IOMMU core handle */
 
 	char res_name[16];
+	bool mio_capable;
 	struct zpci_bar_struct bars[PCI_BAR_COUNT];
 
 	u64		start_dma;	/* Start of available DMA addresses */
diff --git a/arch/s390/include/asm/pci_clp.h b/arch/s390/include/asm/pci_clp.h
index d2d824a91e66..3ec52a05d500 100644
--- a/arch/s390/include/asm/pci_clp.h
+++ b/arch/s390/include/asm/pci_clp.h
@@ -43,6 +43,8 @@ struct clp_fh_list_entry {
 
 #define CLP_SET_ENABLE_PCI_FN	0	/* Yes, 0 enables it */
 #define CLP_SET_DISABLE_PCI_FN	1	/* Yes, 1 disables it */
+#define CLP_SET_ENABLE_MIO	2
+#define CLP_SET_DISABLE_MIO	3
 
 #define CLP_UTIL_STR_LEN	64
 #define CLP_PFIP_NR_SEGMENTS	4
@@ -80,7 +82,8 @@ struct clp_req_query_pci {
 struct clp_rsp_query_pci {
 	struct clp_rsp_hdr hdr;
 	u16 vfn;			/* virtual fn number */
-	u16			:  7;
+	u16			:  6;
+	u16 mio_addr_avail	:  1;
 	u16 util_str_avail	:  1;	/* utility string available? */
 	u16 pfgid		:  8;	/* pci function group id */
 	u32 fid;			/* pci function id */
@@ -96,6 +99,15 @@ struct clp_rsp_query_pci {
 	u32 reserved[11];
 	u32 uid;			/* user defined id */
 	u8 util_str[CLP_UTIL_STR_LEN];	/* utility string */
+	u32 reserved2[16];
+	u32 mio_valid : 6;
+	u32 : 26;
+	u32 : 32;
+	struct {
+		u64 wb;
+		u64 wt;
+	} addr[PCI_BAR_COUNT];
+	u32 reserved3[6];
 } __packed;
 
 /* Query PCI function group request */
diff --git a/arch/s390/include/asm/pci_insn.h b/arch/s390/include/asm/pci_insn.h
index 71f19604ec61..61cf9531f68f 100644
--- a/arch/s390/include/asm/pci_insn.h
+++ b/arch/s390/include/asm/pci_insn.h
@@ -2,6 +2,8 @@
 #ifndef _ASM_S390_PCI_INSN_H
 #define _ASM_S390_PCI_INSN_H
 
+#include <linux/jump_label.h>
+
 /* Load/Store status codes */
 #define ZPCI_PCI_ST_FUNC_NOT_ENABLED		4
 #define ZPCI_PCI_ST_FUNC_IN_ERR			8
@@ -122,6 +124,8 @@ union zpci_sic_iib {
 	struct zpci_cdiib cdiib;
 };
 
+DECLARE_STATIC_KEY_FALSE(have_mio);
+
 u8 zpci_mod_fc(u64 req, struct zpci_fib *fib, u8 *status);
 int zpci_refresh_trans(u64 fn, u64 addr, u64 range);
 int __zpci_load(u64 *data, u64 req, u64 offset);
@@ -129,6 +133,7 @@ int zpci_load(u64 *data, const volatile void __iomem *addr, unsigned long len);
 int __zpci_store(u64 data, u64 req, u64 offset);
 int zpci_store(const volatile void __iomem *addr, u64 data, unsigned long len);
 int __zpci_store_block(const u64 *data, u64 req, u64 offset);
+void zpci_barrier(void);
 int __zpci_set_irq_ctrl(u16 ctl, u8 isc, union zpci_sic_iib *iib);
 
 static inline int zpci_set_irq_ctrl(u16 ctl, u8 isc)