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Message-Id: <20230216123419.461016-15-bhe@redhat.com>
Date: Thu, 16 Feb 2023 20:34:17 +0800
From: Baoquan He <bhe@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, akpm@...ux-foundation.org,
christophe.leroy@...roup.eu, hch@...radead.org,
agordeev@...ux.ibm.com, wangkefeng.wang@...wei.com,
schnelle@...ux.ibm.com, David.Laight@...LAB.COM, shorne@...il.com,
arnd@...db.de, Baoquan He <bhe@...hat.com>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v4 14/16] powerpc: mm: Convert to GENERIC_IOREMAP
From: Christophe Leroy <christophe.leroy@...roup.eu>
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 codes
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().
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
Signed-off-by: Baoquan He <bhe@...hat.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: linuxppc-dev@...ts.ozlabs.org
---
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(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 7a5f8dbfbdd0..02ae9e6afed6 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -181,6 +181,7 @@ 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
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
index fc112a91d0c2..127d8300b40b 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -859,8 +859,8 @@ 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
@@ -874,14 +874,12 @@ void __iomem *ioremap_coherent(phys_addr_t address, unsigned long size);
#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);
diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c
index 4f12504fb405..705e8e8ffde4 100644
--- a/arch/powerpc/mm/ioremap.c
+++ b/arch/powerpc/mm/ioremap.c
@@ -41,7 +41,7 @@ void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size)
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, phys_addr_t pa,
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;
-}
diff --git a/arch/powerpc/mm/ioremap_32.c b/arch/powerpc/mm/ioremap_32.c
index 9d13143b8be4..ca5bc6be3e6f 100644
--- a/arch/powerpc/mm/ioremap_32.c
+++ b/arch/powerpc/mm/ioremap_32.c
@@ -21,6 +21,13 @@ __ioremap_caller(phys_addr_t addr, unsigned long size, pgprot_t prot, void *call
phys_addr_t p, offset;
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.
@@ -31,13 +38,6 @@ __ioremap_caller(phys_addr_t addr, unsigned long size, pgprot_t prot, void *call
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, unsigned long size, pgprot_t prot, void *call
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);
diff --git a/arch/powerpc/mm/ioremap_64.c b/arch/powerpc/mm/ioremap_64.c
index 3acece00b33e..d24e5f166723 100644
--- a/arch/powerpc/mm/ioremap_64.c
+++ b/arch/powerpc/mm/ioremap_64.c
@@ -29,7 +29,7 @@ void __iomem *__ioremap_caller(phys_addr_t addr, unsigned long size,
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_t addr, unsigned long size,
*/
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);
--
2.34.1
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