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Subject[PATCH] ppc64: Abolish ioremap_mm
Andrew, please apply:

Currently ppc64 has two mm_structs for the kernel, init_mm and also
ioremap_mm. The latter really isn't necessary: this patch abolishes
it, instead restricting vmallocs to the lower 1TB of the init_mm's
range and placing io mappings in the upper 1TB. This simplifies the
code in a number of places and eliminates an unecessary set of
pagetables. It also tweaks the unmap/free path a little, allowing us
to remove the unmap_im_area() set of page table walkers, replacing
them with unmap_vm_area().

arch/ppc64/kernel/eeh.c | 2
arch/ppc64/kernel/head.S | 4 -
arch/ppc64/kernel/process.c | 8 ---
arch/ppc64/mm/hash_utils.c | 4 -
arch/ppc64/mm/imalloc.c | 20 +++++----
arch/ppc64/mm/init.c | 93 ++++--------------------------------------
include/asm-ppc64/imalloc.h | 12 +++--
include/asm-ppc64/page.h | 2
include/asm-ppc64/pgtable.h | 9 ----
include/asm-ppc64/processor.h | 10 ----
10 files changed, 31 insertions(+), 133 deletions(-)
Signed-off-by: David Gibson <dwg@au1.ibm.com>

Index: working-2.6/include/asm-ppc64/pgtable.h
===================================================================
--- working-2.6.orig/include/asm-ppc64/pgtable.h 2005-05-11 10:05:51.000000000 +1000
+++ working-2.6/include/asm-ppc64/pgtable.h 2005-05-12 14:08:37.000000000 +1000
@@ -53,7 +53,8 @@
* Define the address range of the vmalloc VM area.
*/
#define VMALLOC_START (0xD000000000000000ul)
-#define VMALLOC_END (VMALLOC_START + EADDR_MASK)
+#define VMALLOC_SIZE (0x10000000000UL)
+#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)

/*
* Bits in a linux-style PTE. These match the bits in the
@@ -239,9 +240,6 @@
/* This now only contains the vmalloc pages */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)

-/* to find an entry in the ioremap page-table-directory */
-#define pgd_offset_i(address) (ioremap_pgd + pgd_index(address))
-
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
@@ -459,15 +457,12 @@
#define __HAVE_ARCH_PTE_SAME
#define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)

-extern unsigned long ioremap_bot, ioremap_base;
-
#define pmd_ERROR(e) \
printk("%s:%d: bad pmd %08x.\n", __FILE__, __LINE__, pmd_val(e))
#define pgd_ERROR(e) \
printk("%s:%d: bad pgd %08x.\n", __FILE__, __LINE__, pgd_val(e))

extern pgd_t swapper_pg_dir[];
-extern pgd_t ioremap_dir[];

extern void paging_init(void);

Index: working-2.6/include/asm-ppc64/imalloc.h
===================================================================
--- working-2.6.orig/include/asm-ppc64/imalloc.h 2005-05-11 10:05:51.000000000 +1000
+++ working-2.6/include/asm-ppc64/imalloc.h 2005-05-12 14:08:37.000000000 +1000
@@ -4,9 +4,9 @@
/*
* Define the address range of the imalloc VM area.
*/
-#define PHBS_IO_BASE IOREGIONBASE
-#define IMALLOC_BASE (IOREGIONBASE + 0x80000000ul) /* Reserve 2 gigs for PHBs */
-#define IMALLOC_END (IOREGIONBASE + EADDR_MASK)
+#define PHBS_IO_BASE VMALLOC_END
+#define IMALLOC_BASE (PHBS_IO_BASE + 0x80000000ul) /* Reserve 2 gigs for PHBs */
+#define IMALLOC_END (VMALLOC_START + EADDR_MASK)


/* imalloc region types */
@@ -18,7 +18,9 @@

extern struct vm_struct * im_get_free_area(unsigned long size);
extern struct vm_struct * im_get_area(unsigned long v_addr, unsigned long size,
- int region_type);
-unsigned long im_free(void *addr);
+ int region_type);
+extern void im_free(void *addr);
+
+extern unsigned long ioremap_bot;

#endif /* _PPC64_IMALLOC_H */
Index: working-2.6/include/asm-ppc64/page.h
===================================================================
--- working-2.6.orig/include/asm-ppc64/page.h 2005-05-11 10:05:51.000000000 +1000
+++ working-2.6/include/asm-ppc64/page.h 2005-05-12 14:08:37.000000000 +1000
@@ -202,9 +202,7 @@
#define PAGE_OFFSET ASM_CONST(0xC000000000000000)
#define KERNELBASE PAGE_OFFSET
#define VMALLOCBASE ASM_CONST(0xD000000000000000)
-#define IOREGIONBASE ASM_CONST(0xE000000000000000)

-#define IO_REGION_ID (IOREGIONBASE >> REGION_SHIFT)
#define VMALLOC_REGION_ID (VMALLOCBASE >> REGION_SHIFT)
#define KERNEL_REGION_ID (KERNELBASE >> REGION_SHIFT)
#define USER_REGION_ID (0UL)
Index: working-2.6/arch/ppc64/kernel/eeh.c
===================================================================
--- working-2.6.orig/arch/ppc64/kernel/eeh.c 2005-04-26 15:37:55.000000000 +1000
+++ working-2.6/arch/ppc64/kernel/eeh.c 2005-05-12 14:05:12.000000000 +1000
@@ -505,7 +505,7 @@
pte_t *ptep;
unsigned long pa;

- ptep = find_linux_pte(ioremap_mm.pgd, token);
+ ptep = find_linux_pte(init_mm.pgd, token);
if (!ptep)
return token;
pa = pte_pfn(*ptep) << PAGE_SHIFT;
Index: working-2.6/arch/ppc64/kernel/process.c
===================================================================
--- working-2.6.orig/arch/ppc64/kernel/process.c 2005-04-26 15:37:55.000000000 +1000
+++ working-2.6/arch/ppc64/kernel/process.c 2005-05-12 14:05:12.000000000 +1000
@@ -58,14 +58,6 @@
struct task_struct *last_task_used_altivec = NULL;
#endif

-struct mm_struct ioremap_mm = {
- .pgd = ioremap_dir,
- .mm_users = ATOMIC_INIT(2),
- .mm_count = ATOMIC_INIT(1),
- .cpu_vm_mask = CPU_MASK_ALL,
- .page_table_lock = SPIN_LOCK_UNLOCKED,
-};
-
/*
* Make sure the floating-point register state in the
* the thread_struct is up to date for task tsk.
Index: working-2.6/include/asm-ppc64/processor.h
===================================================================
--- working-2.6.orig/include/asm-ppc64/processor.h 2005-04-26 15:38:02.000000000 +1000
+++ working-2.6/include/asm-ppc64/processor.h 2005-05-12 14:08:37.000000000 +1000
@@ -590,16 +590,6 @@
}

/*
- * Note: the vm_start and vm_end fields here should *not*
- * be in kernel space. (Could vm_end == vm_start perhaps?)
- */
-#define IOREMAP_MMAP { &ioremap_mm, 0, 0x1000, NULL, \
- PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, \
- 1, NULL, NULL }
-
-extern struct mm_struct ioremap_mm;
-
-/*
* Return saved PC of a blocked thread. For now, this is the "user" PC
*/
#define thread_saved_pc(tsk) \
Index: working-2.6/arch/ppc64/mm/hash_utils.c
===================================================================
--- working-2.6.orig/arch/ppc64/mm/hash_utils.c 2005-05-11 10:05:49.000000000 +1000
+++ working-2.6/arch/ppc64/mm/hash_utils.c 2005-05-12 14:08:37.000000000 +1000
@@ -310,10 +310,6 @@

vsid = get_vsid(mm->context.id, ea);
break;
- case IO_REGION_ID:
- mm = &ioremap_mm;
- vsid = get_kernel_vsid(ea);
- break;
case VMALLOC_REGION_ID:
mm = &init_mm;
vsid = get_kernel_vsid(ea);
Index: working-2.6/arch/ppc64/mm/init.c
===================================================================
--- working-2.6.orig/arch/ppc64/mm/init.c 2005-05-11 10:05:49.000000000 +1000
+++ working-2.6/arch/ppc64/mm/init.c 2005-05-12 14:11:16.000000000 +1000
@@ -73,9 +73,6 @@
extern pgd_t swapper_pg_dir[];
extern struct task_struct *current_set[NR_CPUS];

-extern pgd_t ioremap_dir[];
-pgd_t * ioremap_pgd = (pgd_t *)&ioremap_dir;
-
unsigned long klimit = (unsigned long)_end;

unsigned long _SDR1=0;
@@ -137,69 +134,6 @@

#else

-static void unmap_im_area_pte(pmd_t *pmd, unsigned long addr,
- unsigned long end)
-{
- pte_t *pte;
-
- pte = pte_offset_kernel(pmd, addr);
- do {
- pte_t ptent = ptep_get_and_clear(&ioremap_mm, addr, pte);
- WARN_ON(!pte_none(ptent) && !pte_present(ptent));
- } while (pte++, addr += PAGE_SIZE, addr != end);
-}
-
-static inline void unmap_im_area_pmd(pud_t *pud, unsigned long addr,
- unsigned long end)
-{
- pmd_t *pmd;
- unsigned long next;
-
- pmd = pmd_offset(pud, addr);
- do {
- next = pmd_addr_end(addr, end);
- if (pmd_none_or_clear_bad(pmd))
- continue;
- unmap_im_area_pte(pmd, addr, next);
- } while (pmd++, addr = next, addr != end);
-}
-
-static inline void unmap_im_area_pud(pgd_t *pgd, unsigned long addr,
- unsigned long end)
-{
- pud_t *pud;
- unsigned long next;
-
- pud = pud_offset(pgd, addr);
- do {
- next = pud_addr_end(addr, end);
- if (pud_none_or_clear_bad(pud))
- continue;
- unmap_im_area_pmd(pud, addr, next);
- } while (pud++, addr = next, addr != end);
-}
-
-static void unmap_im_area(unsigned long addr, unsigned long end)
-{
- struct mm_struct *mm = &ioremap_mm;
- unsigned long next;
- pgd_t *pgd;
-
- spin_lock(&mm->page_table_lock);
-
- pgd = pgd_offset_i(addr);
- flush_cache_vunmap(addr, end);
- do {
- next = pgd_addr_end(addr, end);
- if (pgd_none_or_clear_bad(pgd))
- continue;
- unmap_im_area_pud(pgd, addr, next);
- } while (pgd++, addr = next, addr != end);
- flush_tlb_kernel_range(start, end);
-
- spin_unlock(&mm->page_table_lock);
-}
-
/*
* map_io_page currently only called by __ioremap
* map_io_page adds an entry to the ioremap page table
@@ -214,21 +148,21 @@
unsigned long vsid;

if (mem_init_done) {
- spin_lock(&ioremap_mm.page_table_lock);
- pgdp = pgd_offset_i(ea);
- pudp = pud_alloc(&ioremap_mm, pgdp, ea);
+ spin_lock(&init_mm.page_table_lock);
+ pgdp = pgd_offset_k(ea);
+ pudp = pud_alloc(&init_mm, pgdp, ea);
if (!pudp)
return -ENOMEM;
- pmdp = pmd_alloc(&ioremap_mm, pudp, ea);
+ pmdp = pmd_alloc(&init_mm, pudp, ea);
if (!pmdp)
return -ENOMEM;
- ptep = pte_alloc_kernel(&ioremap_mm, pmdp, ea);
+ ptep = pte_alloc_kernel(&init_mm, pmdp, ea);
if (!ptep)
return -ENOMEM;
pa = abs_to_phys(pa);
- set_pte_at(&ioremap_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
+ set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
__pgprot(flags)));
- spin_unlock(&ioremap_mm.page_table_lock);
+ spin_unlock(&init_mm.page_table_lock);
} else {
unsigned long va, vpn, hash, hpteg;

@@ -267,13 +201,9 @@

for (i = 0; i < size; i += PAGE_SIZE)
if (map_io_page(ea+i, pa+i, flags))
- goto failure;
+ return NULL;

return (void __iomem *) (ea + (addr & ~PAGE_MASK));
- failure:
- if (mem_init_done)
- unmap_im_area(ea, ea + size);
- return NULL;
}


@@ -381,19 +311,14 @@
*/
void iounmap(volatile void __iomem *token)
{
- unsigned long address, size;
void *addr;

if (!mem_init_done)
return;

addr = (void *) ((unsigned long __force) token & PAGE_MASK);
-
- if ((size = im_free(addr)) == 0)
- return;

- address = (unsigned long)addr;
- unmap_im_area(address, address + size);
+ im_free(addr);
}

static int iounmap_subset_regions(unsigned long addr, unsigned long size)
Index: working-2.6/arch/ppc64/kernel/head.S
===================================================================
--- working-2.6.orig/arch/ppc64/kernel/head.S 2005-04-26 15:37:55.000000000 +1000
+++ working-2.6/arch/ppc64/kernel/head.S 2005-05-12 14:08:37.000000000 +1000
@@ -2121,10 +2121,6 @@
swapper_pg_dir:
.space 4096

- .globl ioremap_dir
-ioremap_dir:
- .space 4096
-
#ifdef CONFIG_SMP
/* 1 page segment table per cpu (max 48, cpu0 allocated at STAB0_PHYS_ADDR) */
.globl stab_array
Index: working-2.6/arch/ppc64/mm/imalloc.c
===================================================================
--- working-2.6.orig/arch/ppc64/mm/imalloc.c 2005-05-11 10:05:49.000000000 +1000
+++ working-2.6/arch/ppc64/mm/imalloc.c 2005-05-12 14:20:33.000000000 +1000
@@ -15,6 +15,7 @@
#include <asm/pgtable.h>
#include <asm/semaphore.h>
#include <asm/imalloc.h>
+#include <asm/cacheflush.h>

static DECLARE_MUTEX(imlist_sem);
struct vm_struct * imlist = NULL;
@@ -285,29 +286,32 @@
return area;
}

-unsigned long im_free(void * addr)
+void im_free(void * addr)
{
struct vm_struct **p, *tmp;
- unsigned long ret_size = 0;

if (!addr)
- return ret_size;
- if ((PAGE_SIZE-1) & (unsigned long) addr) {
+ return;
+ if ((unsigned long) addr & ~PAGE_MASK) {
printk(KERN_ERR "Trying to %s bad address (%p)\n", __FUNCTION__, addr);
- return ret_size;
+ return;
}
down(&imlist_sem);
for (p = &imlist ; (tmp = *p) ; p = &tmp->next) {
if (tmp->addr == addr) {
- ret_size = tmp->size;
*p = tmp->next;
+
+ /* XXX: do we need the lock? */
+ spin_lock(&init_mm.page_table_lock);
+ unmap_vm_area(tmp);
+ spin_unlock(&init_mm.page_table_lock);
+
kfree(tmp);
up(&imlist_sem);
- return ret_size;
+ return;
}
}
up(&imlist_sem);
printk(KERN_ERR "Trying to %s nonexistent area (%p)\n", __FUNCTION__,
addr);
- return ret_size;
}

--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/people/dgibson
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