The patch titled
Subject: powerpc: mm: convert to GENERIC_IOREMAP
has been added to the -mm mm-unstable branch. Its filename is
powerpc-mm-convert-to-generic_ioremap.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/powerpc-mm-convert-to-generic_ioremap.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Subject: powerpc: mm: convert to GENERIC_IOREMAP
Date: Thu, 6 Jul 2023 23:45:18 +0800
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 powerpc's
special operation when ioremap() and iounmap().
Link: https://lkml.kernel.org/r/20230706154520.11257-18-bhe@xxxxxxxxxx
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Brian Cain <bcain@xxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>
Cc: Chris Zankel <chris@xxxxxxxxxx>
Cc: David Laight <David.Laight@xxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Cc: Jonas Bonn <jonas@xxxxxxxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Stafford Horne <shorne@xxxxxxxxx>
Cc: Stefan Kristiansson <stefan.kristiansson@xxxxxxxxxxxxx>
Cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Vineet Gupta <vgupta@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/Kconfig | 1 +
arch/powerpc/include/asm/io.h | 8 +++-----
arch/powerpc/mm/ioremap.c | 26 +-------------------------
arch/powerpc/mm/ioremap_32.c | 19 +++++++++----------
arch/powerpc/mm/ioremap_64.c | 12 ++----------
5 files changed, 16 insertions(+), 50 deletions(-)
--- a/arch/powerpc/include/asm/io.h~powerpc-mm-convert-to-generic_ioremap
+++ a/arch/powerpc/include/asm/io.h
@@ -889,8 +889,8 @@ static inline void iosync(void)
*
*/
extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
-extern void __iomem *ioremap_prot(phys_addr_t address, unsigned long size,
- unsigned long flags);
+#define ioremap ioremap
+#define ioremap_prot ioremap_prot
extern void __iomem *ioremap_wc(phys_addr_t address, unsigned long size);
#define ioremap_wc ioremap_wc
@@ -904,14 +904,12 @@ void __iomem *ioremap_coherent(phys_addr
#define ioremap_cache(addr, size) \
ioremap_prot((addr), (size), pgprot_val(PAGE_KERNEL))
-extern void iounmap(volatile void __iomem *addr);
+#define iounmap iounmap
void __iomem *ioremap_phb(phys_addr_t paddr, unsigned long size);
int early_ioremap_range(unsigned long ea, phys_addr_t pa,
unsigned long size, pgprot_t prot);
-void __iomem *do_ioremap(phys_addr_t pa, phys_addr_t offset, unsigned long size,
- pgprot_t prot, void *caller);
extern void __iomem *__ioremap_caller(phys_addr_t, unsigned long size,
pgprot_t prot, void *caller);
--- a/arch/powerpc/Kconfig~powerpc-mm-convert-to-generic_ioremap
+++ a/arch/powerpc/Kconfig
@@ -193,6 +193,7 @@ config PPC
select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
select GENERIC_EARLY_IOREMAP
select GENERIC_GETTIMEOFDAY
+ select GENERIC_IOREMAP
select GENERIC_IRQ_SHOW
select GENERIC_IRQ_SHOW_LEVEL
select GENERIC_PCI_IOMAP if PCI
--- a/arch/powerpc/mm/ioremap_32.c~powerpc-mm-convert-to-generic_ioremap
+++ a/arch/powerpc/mm/ioremap_32.c
@@ -22,6 +22,13 @@ __ioremap_caller(phys_addr_t addr, unsig
int err;
/*
+ * If the address lies within the first 16 MB, assume it's in ISA
+ * memory space
+ */
+ if (addr < SZ_16M)
+ addr += _ISA_MEM_BASE;
+
+ /*
* Choose an address to map it to.
* Once the vmalloc system is running, we use it.
* Before then, we use space going down from IOREMAP_TOP
@@ -31,13 +38,6 @@ __ioremap_caller(phys_addr_t addr, unsig
offset = addr & ~PAGE_MASK;
size = PAGE_ALIGN(addr + size) - p;
- /*
- * If the address lies within the first 16 MB, assume it's in ISA
- * memory space
- */
- if (p < 16 * 1024 * 1024)
- p += _ISA_MEM_BASE;
-
#ifndef CONFIG_CRASH_DUMP
/*
* Don't allow anybody to remap normal RAM that we're using.
@@ -63,7 +63,7 @@ __ioremap_caller(phys_addr_t addr, unsig
return (void __iomem *)v + offset;
if (slab_is_available())
- return do_ioremap(p, offset, size, prot, caller);
+ return generic_ioremap_prot(addr, size, prot);
/*
* Should check if it is a candidate for a BAT mapping
@@ -87,7 +87,6 @@ void iounmap(volatile void __iomem *addr
if (v_block_mapped((unsigned long)addr))
return;
- if (addr > high_memory && (unsigned long)addr < ioremap_bot)
- vunmap((void *)(PAGE_MASK & (unsigned long)addr));
+ generic_iounmap(addr);
}
EXPORT_SYMBOL(iounmap);
--- a/arch/powerpc/mm/ioremap_64.c~powerpc-mm-convert-to-generic_ioremap
+++ a/arch/powerpc/mm/ioremap_64.c
@@ -29,7 +29,7 @@ void __iomem *__ioremap_caller(phys_addr
return NULL;
if (slab_is_available())
- return do_ioremap(paligned, offset, size, prot, caller);
+ return generic_ioremap_prot(addr, size, prot);
pr_warn("ioremap() called early from %pS. Use early_ioremap() instead\n", caller);
@@ -49,17 +49,9 @@ void __iomem *__ioremap_caller(phys_addr
*/
void iounmap(volatile void __iomem *token)
{
- void *addr;
-
if (!slab_is_available())
return;
- addr = (void *)((unsigned long __force)PCI_FIX_ADDR(token) & PAGE_MASK);
-
- if ((unsigned long)addr < ioremap_bot) {
- pr_warn("Attempt to iounmap early bolted mapping at 0x%p\n", addr);
- return;
- }
- vunmap(addr);
+ generic_iounmap(PCI_FIX_ADDR(token));
}
EXPORT_SYMBOL(iounmap);
--- a/arch/powerpc/mm/ioremap.c~powerpc-mm-convert-to-generic_ioremap
+++ a/arch/powerpc/mm/ioremap.c
@@ -41,7 +41,7 @@ void __iomem *ioremap_coherent(phys_addr
return __ioremap_caller(addr, size, prot, caller);
}
-void __iomem *ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags)
+void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long flags)
{
pte_t pte = __pte(flags);
void *caller = __builtin_return_address(0);
@@ -74,27 +74,3 @@ int early_ioremap_range(unsigned long ea
return 0;
}
-
-void __iomem *do_ioremap(phys_addr_t pa, phys_addr_t offset, unsigned long size,
- pgprot_t prot, void *caller)
-{
- struct vm_struct *area;
- int ret;
- unsigned long va;
-
- area = __get_vm_area_caller(size, VM_IOREMAP, IOREMAP_START, IOREMAP_END, caller);
- if (area == NULL)
- return NULL;
-
- area->phys_addr = pa;
- va = (unsigned long)area->addr;
-
- ret = ioremap_page_range(va, va + size, pa, prot);
- if (!ret)
- return (void __iomem *)area->addr + offset;
-
- vunmap_range(va, va + size);
- free_vm_area(area);
-
- return NULL;
-}
_
Patches currently in -mm which might be from christophe.leroy@xxxxxxxxxx are
mm-ioremap-define-generic_ioremap_prot-and-generic_iounmap.patch
mm-ioremap-consider-ioremap-space-in-generic-ioremap.patch
powerpc-mm-convert-to-generic_ioremap.patch
