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Message-Id: <20230706154520.11257-11-bhe@redhat.com>
Date: Thu, 6 Jul 2023 23:45:11 +0800
From: Baoquan He <bhe@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: akpm@...ux-foundation.org, linux-mm@...ck.org, arnd@...db.de,
hch@....de, christophe.leroy@...roup.eu, rppt@...nel.org,
willy@...radead.org, agordeev@...ux.ibm.com,
wangkefeng.wang@...wei.com, schnelle@...ux.ibm.com,
shorne@...il.com, David.Laight@...LAB.COM, deller@....de,
nathan@...nel.org, glaubitz@...sik.fu-berlin.de,
Baoquan He <bhe@...hat.com>,
Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>, linux-s390@...r.kernel.org
Subject: [PATCH v8 10/19] s390: mm: Convert to GENERIC_IOREMAP
By taking GENERIC_IOREMAP method, the generic generic_ioremap_prot(),
generic_iounmap(), and their generic wrapper ioremap_prot(), ioremap()
and iounmap() are all visible and available to arch. Arch needs to
provide wrapper functions to override the generic versions if there's
arch specific handling in its ioremap_prot(), ioremap() or iounmap().
This change will simplify implementation by removing duplicated code
with generic_ioremap_prot() and generic_iounmap(), and has the equivalent
functioality as before.
Here, add wrapper functions ioremap_prot() and iounmap() for s390's
special operation when ioremap() and iounmap().
And also replace including <asm-generic/io.h> with <asm/io.h> in
arch/s390/kernel/perf_cpum_sf.c, otherwise building error will be seen
because macro defined in <asm/io.h> can't be seen in perf_cpum_sf.c.
Signed-off-by: Baoquan He <bhe@...hat.com>
Reviewed-by: Niklas Schnelle <schnelle@...ux.ibm.com>
Tested-by: Niklas Schnelle <schnelle@...ux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Mike Rapoport (IBM) <rppt@...nel.org>
Cc: Gerald Schaefer <gerald.schaefer@...ux.ibm.com>
Cc: Heiko Carstens <hca@...ux.ibm.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>
Cc: Alexander Gordeev <agordeev@...ux.ibm.com>
Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>
Cc: Sven Schnelle <svens@...ux.ibm.com>
Cc: linux-s390@...r.kernel.org
---
arch/s390/Kconfig | 1 +
arch/s390/include/asm/io.h | 21 ++++++------
arch/s390/kernel/perf_cpum_sf.c | 2 +-
arch/s390/pci/pci.c | 57 ++++++---------------------------
4 files changed, 24 insertions(+), 57 deletions(-)
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 5b39918b7042..290b6f93b816 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -143,6 +143,7 @@ config S390
select GENERIC_SMP_IDLE_THREAD
select GENERIC_TIME_VSYSCALL
select GENERIC_VDSO_TIME_NS
+ select GENERIC_IOREMAP if PCI
select HAVE_ALIGNED_STRUCT_PAGE if SLUB
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_JUMP_LABEL
diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h
index e3882b012bfa..4453ad7c11ac 100644
--- a/arch/s390/include/asm/io.h
+++ b/arch/s390/include/asm/io.h
@@ -22,11 +22,18 @@ void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
#define IO_SPACE_LIMIT 0
-void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot);
-void __iomem *ioremap(phys_addr_t addr, size_t size);
-void __iomem *ioremap_wc(phys_addr_t addr, size_t size);
-void __iomem *ioremap_wt(phys_addr_t addr, size_t size);
-void iounmap(volatile void __iomem *addr);
+/*
+ * I/O memory mapping functions.
+ */
+#define ioremap_prot ioremap_prot
+#define iounmap iounmap
+
+#define _PAGE_IOREMAP pgprot_val(PAGE_KERNEL)
+
+#define ioremap_wc(addr, size) \
+ ioremap_prot((addr), (size), pgprot_val(pgprot_writecombine(PAGE_KERNEL)))
+#define ioremap_wt(addr, size) \
+ ioremap_prot((addr), (size), pgprot_val(pgprot_writethrough(PAGE_KERNEL)))
static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
@@ -51,10 +58,6 @@ static inline void ioport_unmap(void __iomem *p)
#define pci_iomap_wc pci_iomap_wc
#define pci_iomap_wc_range pci_iomap_wc_range
-#define ioremap ioremap
-#define ioremap_wt ioremap_wt
-#define ioremap_wc ioremap_wc
-
#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)
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index 8ecfbce4ac92..dc6afc2221b4 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -22,7 +22,7 @@
#include <asm/irq.h>
#include <asm/debug.h>
#include <asm/timex.h>
-#include <asm-generic/io.h>
+#include <asm/io.h>
/* Minimum number of sample-data-block-tables:
* At least one table is required for the sampling buffer structure.
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index afc3f33788da..d34d5813d006 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -244,62 +244,25 @@ void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
zpci_memcpy_toio(to, from, count);
}
-static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot)
+void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
+ unsigned long prot)
{
- unsigned long offset, vaddr;
- struct vm_struct *area;
- phys_addr_t last_addr;
-
- last_addr = addr + size - 1;
- if (!size || last_addr < addr)
- return NULL;
-
+ /*
+ * When PCI MIO instructions are unavailable the "physical" address
+ * encodes a hint for accessing the PCI memory space it represents.
+ * Just pass it unchanged such that ioread/iowrite can decode it.
+ */
if (!static_branch_unlikely(&have_mio))
- return (void __iomem *) addr;
+ return (void __iomem *)phys_addr;
- offset = addr & ~PAGE_MASK;
- addr &= PAGE_MASK;
- size = PAGE_ALIGN(size + offset);
- area = get_vm_area(size, VM_IOREMAP);
- if (!area)
- return NULL;
-
- vaddr = (unsigned long) area->addr;
- if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
- free_vm_area(area);
- return NULL;
- }
- return (void __iomem *) ((unsigned long) area->addr + offset);
-}
-
-void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
-{
- return __ioremap(addr, size, __pgprot(prot));
+ return generic_ioremap_prot(phys_addr, size, __pgprot(prot));
}
EXPORT_SYMBOL(ioremap_prot);
-void __iomem *ioremap(phys_addr_t addr, size_t size)
-{
- return __ioremap(addr, size, PAGE_KERNEL);
-}
-EXPORT_SYMBOL(ioremap);
-
-void __iomem *ioremap_wc(phys_addr_t addr, size_t size)
-{
- return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL));
-}
-EXPORT_SYMBOL(ioremap_wc);
-
-void __iomem *ioremap_wt(phys_addr_t addr, size_t size)
-{
- return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL));
-}
-EXPORT_SYMBOL(ioremap_wt);
-
void iounmap(volatile void __iomem *addr)
{
if (static_branch_likely(&have_mio))
- vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
+ generic_iounmap(addr);
}
EXPORT_SYMBOL(iounmap);
--
2.34.1
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