diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/mm/testmmiotrace.c')
-rw-r--r-- | ANDROID_3.4.5/arch/x86/mm/testmmiotrace.c | 140 |
1 files changed, 0 insertions, 140 deletions
diff --git a/ANDROID_3.4.5/arch/x86/mm/testmmiotrace.c b/ANDROID_3.4.5/arch/x86/mm/testmmiotrace.c deleted file mode 100644 index 38868adf..00000000 --- a/ANDROID_3.4.5/arch/x86/mm/testmmiotrace.c +++ /dev/null @@ -1,140 +0,0 @@ -/* - * Written by Pekka Paalanen, 2008-2009 <pq@iki.fi> - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/module.h> -#include <linux/io.h> -#include <linux/mmiotrace.h> - -static unsigned long mmio_address; -module_param(mmio_address, ulong, 0); -MODULE_PARM_DESC(mmio_address, " Start address of the mapping of 16 kB " - "(or 8 MB if read_far is non-zero)."); - -static unsigned long read_far = 0x400100; -module_param(read_far, ulong, 0); -MODULE_PARM_DESC(read_far, " Offset of a 32-bit read within 8 MB " - "(default: 0x400100)."); - -static unsigned v16(unsigned i) -{ - return i * 12 + 7; -} - -static unsigned v32(unsigned i) -{ - return i * 212371 + 13; -} - -static void do_write_test(void __iomem *p) -{ - unsigned int i; - pr_info("write test.\n"); - mmiotrace_printk("Write test.\n"); - - for (i = 0; i < 256; i++) - iowrite8(i, p + i); - - for (i = 1024; i < (5 * 1024); i += 2) - iowrite16(v16(i), p + i); - - for (i = (5 * 1024); i < (16 * 1024); i += 4) - iowrite32(v32(i), p + i); -} - -static void do_read_test(void __iomem *p) -{ - unsigned int i; - unsigned errs[3] = { 0 }; - pr_info("read test.\n"); - mmiotrace_printk("Read test.\n"); - - for (i = 0; i < 256; i++) - if (ioread8(p + i) != i) - ++errs[0]; - - for (i = 1024; i < (5 * 1024); i += 2) - if (ioread16(p + i) != v16(i)) - ++errs[1]; - - for (i = (5 * 1024); i < (16 * 1024); i += 4) - if (ioread32(p + i) != v32(i)) - ++errs[2]; - - mmiotrace_printk("Read errors: 8-bit %d, 16-bit %d, 32-bit %d.\n", - errs[0], errs[1], errs[2]); -} - -static void do_read_far_test(void __iomem *p) -{ - pr_info("read far test.\n"); - mmiotrace_printk("Read far test.\n"); - - ioread32(p + read_far); -} - -static void do_test(unsigned long size) -{ - void __iomem *p = ioremap_nocache(mmio_address, size); - if (!p) { - pr_err("could not ioremap, aborting.\n"); - return; - } - mmiotrace_printk("ioremap returned %p.\n", p); - do_write_test(p); - do_read_test(p); - if (read_far && read_far < size - 4) - do_read_far_test(p); - iounmap(p); -} - -/* - * Tests how mmiotrace behaves in face of multiple ioremap / iounmaps in - * a short time. We had a bug in deferred freeing procedure which tried - * to free this region multiple times (ioremap can reuse the same address - * for many mappings). - */ -static void do_test_bulk_ioremapping(void) -{ - void __iomem *p; - int i; - - for (i = 0; i < 10; ++i) { - p = ioremap_nocache(mmio_address, PAGE_SIZE); - if (p) - iounmap(p); - } - - /* Force freeing. If it will crash we will know why. */ - synchronize_rcu(); -} - -static int __init init(void) -{ - unsigned long size = (read_far) ? (8 << 20) : (16 << 10); - - if (mmio_address == 0) { - pr_err("you have to use the module argument mmio_address.\n"); - pr_err("DO NOT LOAD THIS MODULE UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!\n"); - return -ENXIO; - } - - pr_warning("WARNING: mapping %lu kB @ 0x%08lx in PCI address space, " - "and writing 16 kB of rubbish in there.\n", - size >> 10, mmio_address); - do_test(size); - do_test_bulk_ioremapping(); - pr_info("All done.\n"); - return 0; -} - -static void __exit cleanup(void) -{ - pr_debug("unloaded.\n"); -} - -module_init(init); -module_exit(cleanup); -MODULE_LICENSE("GPL"); |