From 1c14fa4937eb73509e07ac12bf8db1fdf4c42a59 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Sat, 7 Feb 2009 15:39:38 -0800 Subject: x86: use early_ioremap in __acpi_map_table __acpi_map_table() effectively reimplements early_ioremap(). Rather than have that duplication, just implement it in terms of early_ioremap(). However, unlike early_ioremap(), __acpi_map_table() just maintains a single mapping which gets replaced each call, and has no corresponding unmap function. Implement this by just removing the previous mapping each time its called. Unfortunately, this will leave a stray mapping at the end. Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Ingo Molnar --- arch/x86/kernel/acpi/boot.c | 27 +++++++-------------------- 1 file changed, 7 insertions(+), 20 deletions(-) (limited to 'arch/x86/kernel/acpi/boot.c') diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index d37593c2f43..c518599e426 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -121,8 +121,8 @@ enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC; */ char *__init __acpi_map_table(unsigned long phys, unsigned long size) { - unsigned long base, offset, mapped_size; - int idx; + static char *prev_map; + static unsigned long prev_size; if (!phys || !size) return NULL; @@ -130,26 +130,13 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size) if (phys+size <= (max_low_pfn_mapped << PAGE_SHIFT)) return __va(phys); - offset = phys & (PAGE_SIZE - 1); - mapped_size = PAGE_SIZE - offset; - clear_fixmap(FIX_ACPI_END); - set_fixmap(FIX_ACPI_END, phys); - base = fix_to_virt(FIX_ACPI_END); + if (prev_map) + early_iounmap(prev_map, prev_size); - /* - * Most cases can be covered by the below. - */ - idx = FIX_ACPI_END; - while (mapped_size < size) { - if (--idx < FIX_ACPI_BEGIN) - return NULL; /* cannot handle this */ - phys += PAGE_SIZE; - clear_fixmap(idx); - set_fixmap(idx, phys); - mapped_size += PAGE_SIZE; - } + prev_size = size; + prev_map = early_ioremap(phys, size); - return ((unsigned char *)base + offset); + return prev_map; } #ifdef CONFIG_PCI_MMCONFIG -- cgit v1.2.3 From eecb9a697f0b790e5840dae8a8b866bea49a86ee Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Sat, 7 Feb 2009 15:39:38 -0800 Subject: x86: always explicitly map acpi memory Always map acpi tables, rather than assuming we can use the normal linear mapping to access the acpi tables. This is necessary in a virtual environment where the linear mappings are to pseudo-physical memory, but the acpi tables exist at a real physical address. It doesn't hurt to map in the normal non-virtual case, so just do it unconditionally. Signed-off-by: Jeremy Fitzhardinge Acked-by: Len Brown Signed-off-by: Ingo Molnar --- arch/x86/kernel/acpi/boot.c | 3 --- 1 file changed, 3 deletions(-) (limited to 'arch/x86/kernel/acpi/boot.c') diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index c518599e426..5424a18f2e4 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -127,9 +127,6 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size) if (!phys || !size) return NULL; - if (phys+size <= (max_low_pfn_mapped << PAGE_SHIFT)) - return __va(phys); - if (prev_map) early_iounmap(prev_map, prev_size); -- cgit v1.2.3 From 05876f88ed9a66b26af613e222795ae790616252 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Sat, 7 Feb 2009 15:39:40 -0800 Subject: acpi: remove final __acpi_map_table mapping before setting acpi_gbl_permanent_mmap On x86, __acpi_map_table uses early_ioremap() to create the mapping, replacing the previous mapping with a new one. Once enough of the kernel is up an running it switches to using normal ioremap(). At that point, we need to clean up the final mapping to avoid a warning from the early_ioremap subsystem. This can be removed after all the instances in the ACPI code are fixed that rely on early-ioremap's implicit overmapping of previously mapped tables. Signed-off-by: Jeremy Fitzhardinge Acked-by: Len Brown Signed-off-by: Ingo Molnar --- arch/x86/kernel/acpi/boot.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'arch/x86/kernel/acpi/boot.c') diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 5424a18f2e4..7217834f6b1 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -124,12 +124,14 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size) static char *prev_map; static unsigned long prev_size; + if (prev_map) { + early_iounmap(prev_map, prev_size); + prev_map = NULL; + } + if (!phys || !size) return NULL; - if (prev_map) - early_iounmap(prev_map, prev_size); - prev_size = size; prev_map = early_ioremap(phys, size); -- cgit v1.2.3 From 7d97277b754d3ee098a5ec69b6aaafb00c94e2f2 Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Sat, 7 Feb 2009 15:39:41 -0800 Subject: acpi/x86: introduce __apci_map_table, v4 to prevent wrongly overwriting fixmap that still want to use. ACPI used to rely on low mappings being all linearly mapped and grew a habit: it never really unmapped certain kinds of tables after use. This can cause problems - for example the hypothetical case when some spurious access still references it. v2: remove prev_map and prev_size in __apci_map_table v3: let acpi_os_unmap_memory() call early_iounmap too, so remove extral calling to early_acpi_os_unmap_memory v4: fix typo in one acpi_get_table_with_size calling Signed-off-by: Yinghai Lu Acked-by: Len Brown Signed-off-by: Ingo Molnar --- arch/x86/kernel/acpi/boot.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) (limited to 'arch/x86/kernel/acpi/boot.c') diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 7217834f6b1..4c2aaea4293 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -121,21 +121,18 @@ enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC; */ char *__init __acpi_map_table(unsigned long phys, unsigned long size) { - static char *prev_map; - static unsigned long prev_size; - - if (prev_map) { - early_iounmap(prev_map, prev_size); - prev_map = NULL; - } if (!phys || !size) return NULL; - prev_size = size; - prev_map = early_ioremap(phys, size); + return early_ioremap(phys, size); +} +void __init __acpi_unmap_table(char *map, unsigned long size) +{ + if (!map || !size) + return; - return prev_map; + early_iounmap(map, size); } #ifdef CONFIG_PCI_MMCONFIG -- cgit v1.2.3