[PATCH v2 08/11] parisc: mm: Convert to GENERIC_IOREMAP

Baoquan He
2022-08-20T00:32:28Z

Add hook arch_ioremap() for parisc's special operation when ioremap(),
then ioremap_[wc|uc]() are converted to use ioremap_prot() from
GENERIC_IOREMAP.

Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-parisc@vger.kernel.org
---
arch/parisc/Kconfig | 1 +
arch/parisc/include/asm/io.h | 16 ++++++---
arch/parisc/mm/ioremap.c | 65 ++++--------------------------------
3 files changed, 18 insertions(+), 64 deletions(-)

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 7f059cd1196a..5fed465c9b83 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -36,6 +36,7 @@ config PARISC
select GENERIC_ATOMIC64 if !64BIT
select GENERIC_IRQ_PROBE
select GENERIC_PCI_IOMAP
+ select GENERIC_IOREMAP
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select GENERIC_SMP_IDLE_THREAD
select GENERIC_ARCH_TOPOLOGY if SMP
diff --git a/arch/parisc/include/asm/io.h b/arch/parisc/include/asm/io.h
index 42ffb60a6ea9..614e21d9749f 100644
--- a/arch/parisc/include/asm/io.h
+++ b/arch/parisc/include/asm/io.h
@@ -123,13 +123,19 @@ static inline void gsc_writeq(unsigned long long val, unsigned long addr)
}

/*
- * The standard PCI ioremap interfaces
+ * I/O memory mapping functions.
*/
-void __iomem *ioremap(unsigned long offset, unsigned long size);
-#define ioremap_wc ioremap
-#define ioremap_uc ioremap
+void __iomem *
+arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long prot);
+#define arch_ioremap arch_ioremap

-extern void iounmap(const volatile void __iomem *addr);
+#define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
+ _PAGE_ACCESSED | _PAGE_NO_CACHE)
+
+#define ioremap_wc(addr, size) \
+ ioremap_prot((addr), (size), _PAGE_IOREMAP)
+#define ioremap_uc(addr, size) \
+ ioremap_prot((addr), (size), _PAGE_IOREMAP)

static inline unsigned char __raw_readb(const volatile void __iomem *addr)
{
diff --git a/arch/parisc/mm/ioremap.c b/arch/parisc/mm/ioremap.c
index 345ff0b66499..28884757fad0 100644
--- a/arch/parisc/mm/ioremap.c
+++ b/arch/parisc/mm/ioremap.c
@@ -13,38 +13,19 @@
#include <linux/io.h>
#include <linux/mm.h>

-/*
- * Generic mapping function (not visible outside):
- */
-
-/*
- * Remap an arbitrary physical address space into the kernel virtual
- * address space.
- *
- * 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 *ioremap(unsigned long phys_addr, unsigned long size)
+void __iomem *
+arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long *prot_val)
{
- void __iomem *addr;
- struct vm_struct *area;
- unsigned long offset, last_addr;
- pgprot_t pgprot;
+ phys_addr_t phys_addr = *paddr;

#ifdef CONFIG_EISA
unsigned long end = phys_addr + size - 1;
/* Support EISA addresses */
if ((phys_addr >= 0x00080000 && end < 0x000fffff) ||
(phys_addr >= 0x00500000 && end < 0x03bfffff))
- phys_addr |= F_EXTEND(0xfc000000);
+ *paddr = phys_addr |= F_EXTEND(0xfc000000);
#endif

- /* Don't allow wraparound or zero size */
- last_addr = phys_addr + size - 1;
- if (!size || last_addr < phys_addr)
- return NULL;
-
/*
* Don't allow anybody to remap normal RAM that we're using..
*/
@@ -58,43 +39,9 @@ void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
for (page = virt_to_page(t_addr);
page <= virt_to_page(t_end); page++) {
if(!PageReserved(page))
- return NULL;
+ return IOMEM_ERR_PTR(-EINVAL);
}
}

- pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY |
- _PAGE_ACCESSED | _PAGE_NO_CACHE);
-
- /*
- * Mappings have to be page-aligned
- */
- offset = phys_addr & ~PAGE_MASK;
- phys_addr &= PAGE_MASK;
- size = PAGE_ALIGN(last_addr + 1) - phys_addr;
-
- /*
- * Ok, go for it..
- */
- area = get_vm_area(size, VM_IOREMAP);
- if (!area)
- return NULL;
-
- addr = (void __iomem *) area->addr;
- if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
- phys_addr, pgprot)) {
- vunmap(addr);
- return NULL;
- }
-
- return (void __iomem *) (offset + (char __iomem *)addr);
-}
-EXPORT_SYMBOL(ioremap);
-
-void iounmap(const volatile void __iomem *io_addr)
-{
- unsigned long addr = (unsigned long)io_addr & PAGE_MASK;
-
- if (is_vmalloc_addr((void *)addr))
- vunmap((void *)addr);
+ return NULL;
}
-EXPORT_SYMBOL(iounmap);
--
2.34.1