Message ID | 1260297833-17625-3-git-send-email-albert_herranz@yahoo.es (mailing list archive) |
---|---|
State | Superseded |
Headers | show |
On Tue, 2009-12-08 at 19:43 +0100, Albert Herranz wrote: > Signed-off-by: Albert Herranz <albert_herranz@yahoo.es> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> That will do for now. At some stage somebody should look at getting proper sparsemem etc... working (or even normal linear memmap with a hole which isn't actually hard but will waste a bit of RAM). Cheers, Ben. > --- > arch/powerpc/mm/init_32.c | 4 ++ > arch/powerpc/mm/mmu_decl.h | 10 ++++- > arch/powerpc/mm/pgtable_32.c | 32 +++++++++++++-- > arch/powerpc/mm/ppc_mmu_32.c | 4 +- > arch/powerpc/platforms/embedded6xx/wii.c | 63 ++++++++++++++++++++++++++++++ > 5 files changed, 106 insertions(+), 7 deletions(-) > > diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c > index 9ddcfb4..703c7c2 100644 > --- a/arch/powerpc/mm/init_32.c > +++ b/arch/powerpc/mm/init_32.c > @@ -131,9 +131,13 @@ void __init MMU_init(void) > MMU_setup(); > > if (lmb.memory.cnt > 1) { > +#ifndef CONFIG_WII > lmb.memory.cnt = 1; > lmb_analyze(); > printk(KERN_WARNING "Only using first contiguous memory region"); > +#else > + wii_memory_fixups(); > +#endif > } > > total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr; > diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h > index d2e5321..9aa39fe 100644 > --- a/arch/powerpc/mm/mmu_decl.h > +++ b/arch/powerpc/mm/mmu_decl.h > @@ -136,6 +136,14 @@ extern phys_addr_t total_lowmem; > extern phys_addr_t memstart_addr; > extern phys_addr_t lowmem_end_addr; > > +#ifdef CONFIG_WII > +extern unsigned long wii_hole_start; > +extern unsigned long wii_hole_size; > + > +extern unsigned long wii_mmu_mapin_mem2(unsigned long top); > +extern void wii_memory_fixups(void); > +#endif > + > /* ...and now those things that may be slightly different between processor > * architectures. -- Dan > */ > @@ -155,5 +163,5 @@ extern void adjust_total_lowmem(void); > #elif defined(CONFIG_PPC32) > /* anything 32-bit except 4xx or 8xx */ > extern void MMU_init_hw(void); > -extern unsigned long mmu_mapin_ram(void); > +extern unsigned long mmu_mapin_ram(unsigned long top); > #endif > diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c > index cb96cb2..b55bbe8 100644 > --- a/arch/powerpc/mm/pgtable_32.c > +++ b/arch/powerpc/mm/pgtable_32.c > @@ -283,18 +283,18 @@ int map_page(unsigned long va, phys_addr_t pa, int flags) > } > > /* > - * Map in a big chunk of physical memory starting at PAGE_OFFSET. > + * Map in a chunk of physical memory starting at start. > */ > -void __init mapin_ram(void) > +void __init __mapin_ram_chunk(unsigned long offset, unsigned long top) > { > unsigned long v, s, f; > phys_addr_t p; > int ktext; > > - s = mmu_mapin_ram(); > + s = offset; > v = PAGE_OFFSET + s; > p = memstart_addr + s; > - for (; s < total_lowmem; s += PAGE_SIZE) { > + for (; s < top; s += PAGE_SIZE) { > ktext = ((char *) v >= _stext && (char *) v < etext); > f = ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL; > map_page(v, p, f); > @@ -307,6 +307,30 @@ void __init mapin_ram(void) > } > } > > +void __init mapin_ram(void) > +{ > + unsigned long s, top; > + > +#ifndef CONFIG_WII > + top = total_lowmem; > + s = mmu_mapin_ram(top); > + __mapin_ram_chunk(s, top); > +#else > + if (!wii_hole_size) { > + s = mmu_mapin_ram(total_lowmem); > + __mapin_ram_chunk(s, total_lowmem); > + } else { > + top = wii_hole_start; > + s = mmu_mapin_ram(top); > + __mapin_ram_chunk(s, top); > + > + top = lmb_end_of_DRAM(); > + s = wii_mmu_mapin_mem2(top); > + __mapin_ram_chunk(s, top); > + } > +#endif > +} > + > /* Scan the real Linux page tables and return a PTE pointer for > * a virtual address in a context. > * Returns true (1) if PTE was found, zero otherwise. The pointer to > diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c > index 2d2a87e..f11c2cd 100644 > --- a/arch/powerpc/mm/ppc_mmu_32.c > +++ b/arch/powerpc/mm/ppc_mmu_32.c > @@ -72,7 +72,7 @@ unsigned long p_mapped_by_bats(phys_addr_t pa) > return 0; > } > > -unsigned long __init mmu_mapin_ram(void) > +unsigned long __init mmu_mapin_ram(unsigned long top) > { > unsigned long tot, bl, done; > unsigned long max_size = (256<<20); > @@ -86,7 +86,7 @@ unsigned long __init mmu_mapin_ram(void) > > /* Make sure we don't map a block larger than the > smallest alignment of the physical address. */ > - tot = total_lowmem; > + tot = top; > for (bl = 128<<10; bl < max_size; bl <<= 1) { > if (bl * 2 > tot) > break; > diff --git a/arch/powerpc/platforms/embedded6xx/wii.c b/arch/powerpc/platforms/embedded6xx/wii.c > index 1bd41cc..5eaed86 100644 > --- a/arch/powerpc/platforms/embedded6xx/wii.c > +++ b/arch/powerpc/platforms/embedded6xx/wii.c > @@ -20,6 +20,8 @@ > #include <linux/seq_file.h> > #include <linux/kexec.h> > #include <linux/of_platform.h> > +#include <linux/lmb.h> > +#include <mm/mmu_decl.h> > > #include <asm/io.h> > #include <asm/machdep.h> > @@ -52,6 +54,67 @@ > static void __iomem *hw_ctrl; > static void __iomem *hw_gpio; > > +unsigned long wii_hole_start; > +unsigned long wii_hole_size; > + > + > +static int page_aligned(unsigned long x) > +{ > + return !(x & (PAGE_SIZE-1)); > +} > + > +void __init wii_memory_fixups(void) > +{ > + struct lmb_property *p = lmb.memory.region; > + > + /* > + * This is part of a workaround to allow the use of two > + * discontiguous RAM ranges on the Wii, even if this is > + * currently unsupported on 32-bit PowerPC Linux. > + * > + * We coealesce the two memory ranges of the Wii into a > + * single range, then create a reservation for the "hole" > + * between both ranges. > + */ > + > + BUG_ON(lmb.memory.cnt != 2); > + BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base)); > + > + p[0].size = _ALIGN_DOWN(p[0].size, PAGE_SIZE); > + p[1].size = _ALIGN_DOWN(p[1].size, PAGE_SIZE); > + > + wii_hole_start = p[0].base + p[0].size; > + wii_hole_size = p[1].base - wii_hole_start; > + > + pr_info("MEM1: <%08llx %08llx>\n", p[0].base, p[0].size); > + pr_info("HOLE: <%08lx %08lx>\n", wii_hole_start, wii_hole_size); > + pr_info("MEM2: <%08llx %08llx>\n", p[1].base, p[1].size); > + > + p[0].size += wii_hole_size + p[1].size; > + > + lmb.memory.cnt = 1; > + lmb_analyze(); > + > + /* reserve the hole */ > + lmb_reserve(wii_hole_start, wii_hole_size); > +} > + > +unsigned long __init wii_mmu_mapin_mem2(unsigned long top) > +{ > + unsigned long delta, size, bl; > + unsigned long max_size = (256<<20); > + > + /* MEM2 64MB@0x10000000 */ > + delta = wii_hole_start + wii_hole_size; > + size = top - delta; > + for (bl = 128<<10; bl < max_size; bl <<= 1) { > + if (bl * 2 > size) > + break; > + } > + setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X); > + return delta + bl; > +} > + > static void wii_spin(void) > { > local_irq_disable();
diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c index 9ddcfb4..703c7c2 100644 --- a/arch/powerpc/mm/init_32.c +++ b/arch/powerpc/mm/init_32.c @@ -131,9 +131,13 @@ void __init MMU_init(void) MMU_setup(); if (lmb.memory.cnt > 1) { +#ifndef CONFIG_WII lmb.memory.cnt = 1; lmb_analyze(); printk(KERN_WARNING "Only using first contiguous memory region"); +#else + wii_memory_fixups(); +#endif } total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr; diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h index d2e5321..9aa39fe 100644 --- a/arch/powerpc/mm/mmu_decl.h +++ b/arch/powerpc/mm/mmu_decl.h @@ -136,6 +136,14 @@ extern phys_addr_t total_lowmem; extern phys_addr_t memstart_addr; extern phys_addr_t lowmem_end_addr; +#ifdef CONFIG_WII +extern unsigned long wii_hole_start; +extern unsigned long wii_hole_size; + +extern unsigned long wii_mmu_mapin_mem2(unsigned long top); +extern void wii_memory_fixups(void); +#endif + /* ...and now those things that may be slightly different between processor * architectures. -- Dan */ @@ -155,5 +163,5 @@ extern void adjust_total_lowmem(void); #elif defined(CONFIG_PPC32) /* anything 32-bit except 4xx or 8xx */ extern void MMU_init_hw(void); -extern unsigned long mmu_mapin_ram(void); +extern unsigned long mmu_mapin_ram(unsigned long top); #endif diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index cb96cb2..b55bbe8 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -283,18 +283,18 @@ int map_page(unsigned long va, phys_addr_t pa, int flags) } /* - * Map in a big chunk of physical memory starting at PAGE_OFFSET. + * Map in a chunk of physical memory starting at start. */ -void __init mapin_ram(void) +void __init __mapin_ram_chunk(unsigned long offset, unsigned long top) { unsigned long v, s, f; phys_addr_t p; int ktext; - s = mmu_mapin_ram(); + s = offset; v = PAGE_OFFSET + s; p = memstart_addr + s; - for (; s < total_lowmem; s += PAGE_SIZE) { + for (; s < top; s += PAGE_SIZE) { ktext = ((char *) v >= _stext && (char *) v < etext); f = ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL; map_page(v, p, f); @@ -307,6 +307,30 @@ void __init mapin_ram(void) } } +void __init mapin_ram(void) +{ + unsigned long s, top; + +#ifndef CONFIG_WII + top = total_lowmem; + s = mmu_mapin_ram(top); + __mapin_ram_chunk(s, top); +#else + if (!wii_hole_size) { + s = mmu_mapin_ram(total_lowmem); + __mapin_ram_chunk(s, total_lowmem); + } else { + top = wii_hole_start; + s = mmu_mapin_ram(top); + __mapin_ram_chunk(s, top); + + top = lmb_end_of_DRAM(); + s = wii_mmu_mapin_mem2(top); + __mapin_ram_chunk(s, top); + } +#endif +} + /* Scan the real Linux page tables and return a PTE pointer for * a virtual address in a context. * Returns true (1) if PTE was found, zero otherwise. The pointer to diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c index 2d2a87e..f11c2cd 100644 --- a/arch/powerpc/mm/ppc_mmu_32.c +++ b/arch/powerpc/mm/ppc_mmu_32.c @@ -72,7 +72,7 @@ unsigned long p_mapped_by_bats(phys_addr_t pa) return 0; } -unsigned long __init mmu_mapin_ram(void) +unsigned long __init mmu_mapin_ram(unsigned long top) { unsigned long tot, bl, done; unsigned long max_size = (256<<20); @@ -86,7 +86,7 @@ unsigned long __init mmu_mapin_ram(void) /* Make sure we don't map a block larger than the smallest alignment of the physical address. */ - tot = total_lowmem; + tot = top; for (bl = 128<<10; bl < max_size; bl <<= 1) { if (bl * 2 > tot) break; diff --git a/arch/powerpc/platforms/embedded6xx/wii.c b/arch/powerpc/platforms/embedded6xx/wii.c index 1bd41cc..5eaed86 100644 --- a/arch/powerpc/platforms/embedded6xx/wii.c +++ b/arch/powerpc/platforms/embedded6xx/wii.c @@ -20,6 +20,8 @@ #include <linux/seq_file.h> #include <linux/kexec.h> #include <linux/of_platform.h> +#include <linux/lmb.h> +#include <mm/mmu_decl.h> #include <asm/io.h> #include <asm/machdep.h> @@ -52,6 +54,67 @@ static void __iomem *hw_ctrl; static void __iomem *hw_gpio; +unsigned long wii_hole_start; +unsigned long wii_hole_size; + + +static int page_aligned(unsigned long x) +{ + return !(x & (PAGE_SIZE-1)); +} + +void __init wii_memory_fixups(void) +{ + struct lmb_property *p = lmb.memory.region; + + /* + * This is part of a workaround to allow the use of two + * discontiguous RAM ranges on the Wii, even if this is + * currently unsupported on 32-bit PowerPC Linux. + * + * We coealesce the two memory ranges of the Wii into a + * single range, then create a reservation for the "hole" + * between both ranges. + */ + + BUG_ON(lmb.memory.cnt != 2); + BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base)); + + p[0].size = _ALIGN_DOWN(p[0].size, PAGE_SIZE); + p[1].size = _ALIGN_DOWN(p[1].size, PAGE_SIZE); + + wii_hole_start = p[0].base + p[0].size; + wii_hole_size = p[1].base - wii_hole_start; + + pr_info("MEM1: <%08llx %08llx>\n", p[0].base, p[0].size); + pr_info("HOLE: <%08lx %08lx>\n", wii_hole_start, wii_hole_size); + pr_info("MEM2: <%08llx %08llx>\n", p[1].base, p[1].size); + + p[0].size += wii_hole_size + p[1].size; + + lmb.memory.cnt = 1; + lmb_analyze(); + + /* reserve the hole */ + lmb_reserve(wii_hole_start, wii_hole_size); +} + +unsigned long __init wii_mmu_mapin_mem2(unsigned long top) +{ + unsigned long delta, size, bl; + unsigned long max_size = (256<<20); + + /* MEM2 64MB@0x10000000 */ + delta = wii_hole_start + wii_hole_size; + size = top - delta; + for (bl = 128<<10; bl < max_size; bl <<= 1) { + if (bl * 2 > size) + break; + } + setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X); + return delta + bl; +} + static void wii_spin(void) { local_irq_disable();
Signed-off-by: Albert Herranz <albert_herranz@yahoo.es> --- arch/powerpc/mm/init_32.c | 4 ++ arch/powerpc/mm/mmu_decl.h | 10 ++++- arch/powerpc/mm/pgtable_32.c | 32 +++++++++++++-- arch/powerpc/mm/ppc_mmu_32.c | 4 +- arch/powerpc/platforms/embedded6xx/wii.c | 63 ++++++++++++++++++++++++++++++ 5 files changed, 106 insertions(+), 7 deletions(-)