diff options
Diffstat (limited to 'kernel/resource.c')
| -rw-r--r-- | kernel/resource.c | 39 |
1 files changed, 26 insertions, 13 deletions
diff --git a/kernel/resource.c b/kernel/resource.c index 54ba6de3757c..e270b5048988 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -1022,6 +1022,7 @@ static void __init __reserve_region_with_split(struct resource *root, struct resource *conflict; struct resource *res = alloc_resource(GFP_ATOMIC); struct resource *next_res = NULL; + int type = resource_type(root); if (!res) return; @@ -1029,7 +1030,7 @@ static void __init __reserve_region_with_split(struct resource *root, res->name = name; res->start = start; res->end = end; - res->flags = IORESOURCE_BUSY; + res->flags = type | IORESOURCE_BUSY; res->desc = IORES_DESC_NONE; while (1) { @@ -1064,7 +1065,7 @@ static void __init __reserve_region_with_split(struct resource *root, next_res->name = name; next_res->start = conflict->end + 1; next_res->end = end; - next_res->flags = IORESOURCE_BUSY; + next_res->flags = type | IORESOURCE_BUSY; next_res->desc = IORES_DESC_NONE; } } else { @@ -1478,7 +1479,7 @@ void __devm_release_region(struct device *dev, struct resource *parent, EXPORT_SYMBOL(__devm_release_region); /* - * Called from init/main.c to reserve IO ports. + * Reserve I/O ports or memory based on "reserve=" kernel parameter. */ #define MAXRESERVE 4 static int __init reserve_setup(char *str) @@ -1489,26 +1490,38 @@ static int __init reserve_setup(char *str) for (;;) { unsigned int io_start, io_num; int x = reserved; + struct resource *parent; - if (get_option (&str, &io_start) != 2) + if (get_option(&str, &io_start) != 2) break; - if (get_option (&str, &io_num) == 0) + if (get_option(&str, &io_num) == 0) break; if (x < MAXRESERVE) { struct resource *res = reserve + x; + + /* + * If the region starts below 0x10000, we assume it's + * I/O port space; otherwise assume it's memory. + */ + if (io_start < 0x10000) { + res->flags = IORESOURCE_IO; + parent = &ioport_resource; + } else { + res->flags = IORESOURCE_MEM; + parent = &iomem_resource; + } res->name = "reserved"; res->start = io_start; res->end = io_start + io_num - 1; - res->flags = IORESOURCE_BUSY; + res->flags |= IORESOURCE_BUSY; res->desc = IORES_DESC_NONE; res->child = NULL; - if (request_resource(res->start >= 0x10000 ? &iomem_resource : &ioport_resource, res) == 0) + if (request_resource(parent, res) == 0) reserved = x+1; } } return 1; } - __setup("reserve=", reserve_setup); /* @@ -1563,17 +1576,17 @@ static int strict_iomem_checks; /* * check if an address is reserved in the iomem resource tree - * returns 1 if reserved, 0 if not reserved. + * returns true if reserved, false if not reserved. */ -int iomem_is_exclusive(u64 addr) +bool iomem_is_exclusive(u64 addr) { struct resource *p = &iomem_resource; - int err = 0; + bool err = false; loff_t l; int size = PAGE_SIZE; if (!strict_iomem_checks) - return 0; + return false; addr = addr & PAGE_MASK; @@ -1596,7 +1609,7 @@ int iomem_is_exclusive(u64 addr) continue; if (IS_ENABLED(CONFIG_IO_STRICT_DEVMEM) || p->flags & IORESOURCE_EXCLUSIVE) { - err = 1; + err = true; break; } } |