diff options
| -rw-r--r-- | arch/x86/kernel/pci-dma_64.c | 49 | ||||
| -rw-r--r-- | arch/x86/kernel/setup_64.c | 2 | ||||
| -rw-r--r-- | include/asm-x86/pci_64.h | 1 |
3 files changed, 52 insertions, 0 deletions
diff --git a/arch/x86/kernel/pci-dma_64.c b/arch/x86/kernel/pci-dma_64.c index 375cb2bc45be..8bc1e185e557 100644 --- a/arch/x86/kernel/pci-dma_64.c +++ b/arch/x86/kernel/pci-dma_64.c @@ -8,6 +8,8 @@ #include <linux/pci.h> #include <linux/module.h> #include <linux/dmar.h> +#include <linux/bootmem.h> +#include <asm/proto.h> #include <asm/io.h> #include <asm/gart.h> #include <asm/calgary.h> @@ -286,8 +288,55 @@ static __init int iommu_setup(char *p) } early_param("iommu", iommu_setup); +static __initdata void *dma32_bootmem_ptr; +static unsigned long dma32_bootmem_size __initdata = (128ULL<<20); + +static int __init parse_dma32_size_opt(char *p) +{ + if (!p) + return -EINVAL; + dma32_bootmem_size = memparse(p, &p); + return 0; +} +early_param("dma32_size", parse_dma32_size_opt); + +void __init dma32_reserve_bootmem(void) +{ + unsigned long size, align; + if (end_pfn <= MAX_DMA32_PFN) + return; + + align = 64ULL<<20; + size = round_up(dma32_bootmem_size, align); + dma32_bootmem_ptr = __alloc_bootmem_nopanic(size, align, + __pa(MAX_DMA_ADDRESS)); + if (dma32_bootmem_ptr) + dma32_bootmem_size = size; + else + dma32_bootmem_size = 0; +} +static void __init dma32_free_bootmem(void) +{ + int node; + + if (end_pfn <= MAX_DMA32_PFN) + return; + + if (!dma32_bootmem_ptr) + return; + + for_each_online_node(node) + free_bootmem_node(NODE_DATA(node), __pa(dma32_bootmem_ptr), + dma32_bootmem_size); + + dma32_bootmem_ptr = NULL; + dma32_bootmem_size = 0; +} + void __init pci_iommu_alloc(void) { + /* free the range so iommu could get some range less than 4G */ + dma32_free_bootmem(); /* * The order of these functions is important for * fall-back/fail-over reasons diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c index 7637dc91c79b..a775fe3de955 100644 --- a/arch/x86/kernel/setup_64.c +++ b/arch/x86/kernel/setup_64.c @@ -389,6 +389,8 @@ void __init setup_arch(char **cmdline_p) early_res_to_bootmem(); + dma32_reserve_bootmem(); + #ifdef CONFIG_ACPI_SLEEP /* * Reserve low memory region for sleep support. diff --git a/include/asm-x86/pci_64.h b/include/asm-x86/pci_64.h index 374690314539..da8266a08005 100644 --- a/include/asm-x86/pci_64.h +++ b/include/asm-x86/pci_64.h @@ -25,6 +25,7 @@ extern int (*pci_config_write)(int seg, int bus, int dev, int fn, int reg, int l +extern void dma32_reserve_bootmem(void); extern void pci_iommu_alloc(void); /* The PCI address space does equal the physical memory |