Re: [PATCH v2 07/11] openrisc: mm: Convert to GENERIC_IOREMAP

Baoquan He
2022-08-29T08:19:55Z

On 08/29/22 at 06:32am, Stafford Horne wrote:
> On Sat, Aug 20, 2022 at 08:31:21AM +0800, Baoquan He wrote:
> > Add hooks arch_ioremap() and arch_iounmap() for operisc's special
> > operation when ioremap() and iounmap.
> >
> > Signed-off-by: Baoquan He <bhe@redhat.com>
> > Cc: Jonas Bonn <jonas@southpole.se>
> > Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
> > Cc: Stafford Horne <shorne@gmail.com>
> > Cc: openrisc@lists.librecores.org
> > ---
> > arch/openrisc/Kconfig | 1 +
> > arch/openrisc/include/asm/io.h | 16 ++++++++---
> > arch/openrisc/mm/ioremap.c | 51 +++++++++++-----------------------
> > 3 files changed, 29 insertions(+), 39 deletions(-)
> >
> > diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
> > index c7f282f60f64..fd9bb76a610b 100644
> > --- a/arch/openrisc/Kconfig
> > +++ b/arch/openrisc/Kconfig
> > @@ -21,6 +21,7 @@ config OPENRISC
> > select GENERIC_IRQ_PROBE
> > select GENERIC_IRQ_SHOW
> > select GENERIC_PCI_IOMAP
> > + select GENERIC_IOREMAP
> > select GENERIC_CPU_DEVICES
> > select HAVE_PCI
> > select HAVE_UID16
> > diff --git a/arch/openrisc/include/asm/io.h b/arch/openrisc/include/asm/io.h
> > index ee6043a03173..9db67938bfc4 100644
> > --- a/arch/openrisc/include/asm/io.h
> > +++ b/arch/openrisc/include/asm/io.h
> > @@ -15,6 +15,8 @@
> > #define __ASM_OPENRISC_IO_H
> >
> > #include <linux/types.h>
> > +#include <asm/pgtable.h>
> > +#include <asm/pgalloc.h>
>
> This seems to cause a compilation issue when building virt_defconig:
>
> CC kernel/irq/generic-chip.o
> In file included from ./include/asm-generic/pgtable-nopud.h:7,
> from ./include/asm-generic/pgtable-nopmd.h:7,
> from ./arch/openrisc/include/asm/pgtable.h:24,
> from ./arch/openrisc/include/asm/io.h:18,
> from ./include/linux/io.h:13,
> from kernel/irq/generic-chip.c:7:
> ./include/asm-generic/pgtable-nop4d.h:9:18: error: unknown type name 'pgd_t'
> 9 | typedef struct { pgd_t pgd; } p4d_t;
> | ^~~~~
>
> It works if we swap the order arround:
>
> +#include <asm/pgalloc.h>
> +#include <asm/pgtable.h>

Thanks a lot, add this change to patch.

>
> Otherwise we need to add an asm/page.h include to asm/pgtable.h (which is more
> correct) but means you would touch more files.
>
> > /*
> > * PCI: We do not use IO ports in OpenRISC
> > @@ -27,11 +29,17 @@
> > #define PIO_OFFSET 0
> > #define PIO_MASK 0
> >
> > -#define ioremap ioremap
> > -void __iomem *ioremap(phys_addr_t offset, unsigned long size);
> > +/*
> > + * I/O memory mapping functions.
> > + */
> > +void __iomem *
> > +arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long *prot_val);
> > +#define arch_ioremap arch_ioremap
> > +
> > +int arch_iounmap(void __iomem *addr);
> > +#define arch_iounmap arch_iounmap
> >
> > -#define iounmap iounmap
> > -extern void iounmap(volatile void __iomem *addr);
> > +#define _PAGE_IOREMAP (pgprot_val(PAGE_KERNEL) | _PAGE_CI)
> >
> > #include <asm-generic/io.h>
> >
> > diff --git a/arch/openrisc/mm/ioremap.c b/arch/openrisc/mm/ioremap.c
> > index 8ec0dafecf25..bc41660e1fb0 100644
> > --- a/arch/openrisc/mm/ioremap.c
> > +++ b/arch/openrisc/mm/ioremap.c
> > @@ -24,26 +24,18 @@ extern int mem_init_done;
> >
> > static unsigned int fixmaps_used __initdata;
> >
> > -/*
> > - * Remap an arbitrary physical address space into the kernel virtual
> > - * address space. Needed when the kernel wants to access high addresses
> > - * directly.
> > - *
> > - * NOTE! We need to allow non-page-aligned mappings too: we will obviously
> > - * have to convert them into an offset in a page-aligned mapping, but the
> > - * caller shouldn't need to know that small detail.
> > - */
> > -void __iomem *__ref ioremap(phys_addr_t addr, unsigned long size)
> > +void __iomem *
> > +arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long *prot_val)
> > {
> > phys_addr_t p;
> > unsigned long v;
> > - unsigned long offset, last_addr;
> > - struct vm_struct *area = NULL;
> > + unsigned long offset, last_addr, addr = *paddr;
> > + int ret = -EINVAL;
> >
> > /* Don't allow wraparound or zero size */
> > last_addr = addr + size - 1;
> > if (!size || last_addr < addr)
> > - return NULL;
> > + return IOMEM_ERR_PTR(ret);
> >
> > /*
> > * Mappings have to be page-aligned
> > @@ -52,32 +44,24 @@ void __iomem *__ref ioremap(phys_addr_t addr, unsigned long size)
> > p = addr & PAGE_MASK;
> > size = PAGE_ALIGN(last_addr + 1) - p;
> >
> > - if (likely(mem_init_done)) {
> > - area = get_vm_area(size, VM_IOREMAP);
> > - if (!area)
> > - return NULL;
> > - v = (unsigned long)area->addr;
> > - } else {
> > + if (unlikely(!mem_init_done)) {
> > if ((fixmaps_used + (size >> PAGE_SHIFT)) > FIX_N_IOREMAPS)
> > - return NULL;
> > + return IOMEM_ERR_PTR(ret);
> > v = fix_to_virt(FIX_IOREMAP_BEGIN + fixmaps_used);
> > fixmaps_used += (size >> PAGE_SHIFT);
> > - }
> >
> > - if (ioremap_page_range(v, v + size, p,
> > - __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_CI))) {
> > - if (likely(mem_init_done))
> > - vfree(area->addr);
> > - else
> > + if (ioremap_page_range(v, v + size, p, __pgprot(*prot_val))) {
> > fixmaps_used -= (size >> PAGE_SHIFT);
> > - return NULL;
> > + return IOMEM_ERR_PTR(ret);
> > + }
> > +
> > + return (void __iomem *)(offset + (char *)v);
> > }
> >
> > - return (void __iomem *)(offset + (char *)v);
> > + return NULL;
> > }
> > -EXPORT_SYMBOL(ioremap);
> >
> > -void iounmap(volatile void __iomem *addr)
> > +int arch_iounmap(void __iomem *addr)
> > {
> > /* If the page is from the fixmap pool then we just clear out
> > * the fixmap mapping.
> > @@ -97,13 +81,10 @@ void iounmap(volatile void __iomem *addr)
> > * ii) invalid accesses to the freed areas aren't made
> > */
> > flush_tlb_all();
> > - return;
> > + return -EINVAL;
> > }
> > -
> > - return vfree((void *)(PAGE_MASK & (unsigned long)addr));
> > + return 0;
> > }
> > -EXPORT_SYMBOL(iounmap);
> > -
> > /**
> > * OK, this one's a bit tricky... ioremap can get called before memory is
> > * initialized (early serial console does this) and will want to alloc a page
> > --
> > 2.34.1
>
> Other than that compiler issue, I fixed it and test booted this and it works
> well.
>
> Acked-by: Stafford Horne <shorne@gmail.com>

Thanks, will add this tag when repost.