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Message-ID: <ZGMp/dltHeJiRKBn@kernel.org>
Date: Tue, 16 May 2023 10:00:13 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Baoquan He <bhe@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
linux-mm@...ck.org, arnd@...db.de, 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, willy@...radead.org,
deller@....de, Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v5 RESEND 15/17] powerpc: mm: Convert to GENERIC_IOREMAP
On Mon, May 15, 2023 at 05:08:46PM +0800, Baoquan He wrote:
> 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
Reviewed-by: Mike Rapoport (IBM) <rppt@...nel.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 539d1f03ff42..e0a88ebcd026 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -194,6 +194,7 @@ 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 67a3fb6de498..0732b743e099 100644
> --- a/arch/powerpc/include/asm/io.h
> +++ b/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_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
>
>
--
Sincerely yours,
Mike.
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