diff options
| -rw-r--r-- | arch/arm/mach-omap2/iommu2.c | 19 | ||||
| -rw-r--r-- | arch/arm/plat-omap/Kconfig | 4 | ||||
| -rw-r--r-- | arch/arm/plat-omap/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/plat-omap/include/mach/iommu.h | 6 | ||||
| -rw-r--r-- | arch/arm/plat-omap/iommu-debug.c | 415 | ||||
| -rw-r--r-- | arch/arm/plat-omap/iommu.c | 23 |
6 files changed, 449 insertions, 19 deletions
diff --git a/arch/arm/mach-omap2/iommu2.c b/arch/arm/mach-omap2/iommu2.c index 015f22a53ead..2d9b5cc981cd 100644 --- a/arch/arm/mach-omap2/iommu2.c +++ b/arch/arm/mach-omap2/iommu2.c @@ -217,10 +217,19 @@ static ssize_t omap2_dump_cr(struct iommu *obj, struct cr_regs *cr, char *buf) } #define pr_reg(name) \ - p += sprintf(p, "%20s: %08x\n", \ - __stringify(name), iommu_read_reg(obj, MMU_##name)); - -static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf) + do { \ + ssize_t bytes; \ + const char *str = "%20s: %08x\n"; \ + const int maxcol = 32; \ + bytes = snprintf(p, maxcol, str, __stringify(name), \ + iommu_read_reg(obj, MMU_##name)); \ + p += bytes; \ + len -= bytes; \ + if (len < maxcol) \ + goto out; \ + } while (0) + +static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t len) { char *p = buf; @@ -242,7 +251,7 @@ static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf) pr_reg(READ_CAM); pr_reg(READ_RAM); pr_reg(EMU_FAULT_AD); - +out: return p - buf; } diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig index efe85d095190..ab9f9efc9b62 100644 --- a/arch/arm/plat-omap/Kconfig +++ b/arch/arm/plat-omap/Kconfig @@ -120,6 +120,10 @@ config OMAP_MBOX_FWK config OMAP_IOMMU tristate +config OMAP_IOMMU_DEBUG + depends on OMAP_IOMMU + tristate + choice prompt "System timer" default OMAP_MPU_TIMER diff --git a/arch/arm/plat-omap/Makefile b/arch/arm/plat-omap/Makefile index a83279523958..769a4c200364 100644 --- a/arch/arm/plat-omap/Makefile +++ b/arch/arm/plat-omap/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_ARCH_OMAP16XX) += ocpi.o obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o obj-$(CONFIG_OMAP_IOMMU) += iommu.o iovmm.o +obj-$(CONFIG_OMAP_IOMMU_DEBUG) += iommu-debug.o obj-$(CONFIG_CPU_FREQ) += cpu-omap.o obj-$(CONFIG_OMAP_DM_TIMER) += dmtimer.o diff --git a/arch/arm/plat-omap/include/mach/iommu.h b/arch/arm/plat-omap/include/mach/iommu.h index 769b00b4c34a..46d41ac83dbf 100644 --- a/arch/arm/plat-omap/include/mach/iommu.h +++ b/arch/arm/plat-omap/include/mach/iommu.h @@ -95,7 +95,7 @@ struct iommu_functions { void (*save_ctx)(struct iommu *obj); void (*restore_ctx)(struct iommu *obj); - ssize_t (*dump_ctx)(struct iommu *obj, char *buf); + ssize_t (*dump_ctx)(struct iommu *obj, char *buf, ssize_t len); }; struct iommu_platform_data { @@ -162,7 +162,7 @@ extern void uninstall_iommu_arch(const struct iommu_functions *ops); extern int foreach_iommu_device(void *data, int (*fn)(struct device *, void *)); -extern ssize_t iommu_dump_ctx(struct iommu *obj, char *buf); -extern size_t dump_tlb_entries(struct iommu *obj, char *buf); +extern ssize_t iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t len); +extern size_t dump_tlb_entries(struct iommu *obj, char *buf, ssize_t len); #endif /* __MACH_IOMMU_H */ diff --git a/arch/arm/plat-omap/iommu-debug.c b/arch/arm/plat-omap/iommu-debug.c new file mode 100644 index 000000000000..c799b3b0d709 --- /dev/null +++ b/arch/arm/plat-omap/iommu-debug.c @@ -0,0 +1,415 @@ +/* + * omap iommu: debugfs interface + * + * Copyright (C) 2008-2009 Nokia Corporation + * + * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/uaccess.h> +#include <linux/platform_device.h> +#include <linux/debugfs.h> + +#include <mach/iommu.h> +#include <mach/iovmm.h> + +#include "iopgtable.h" + +#define MAXCOLUMN 100 /* for short messages */ + +static DEFINE_MUTEX(iommu_debug_lock); + +static struct dentry *iommu_debug_root; + +static ssize_t debug_read_ver(struct file *file, char __user *userbuf, + size_t count, loff_t *ppos) +{ + u32 ver = iommu_arch_version(); + char buf[MAXCOLUMN], *p = buf; + + p += sprintf(p, "H/W version: %d.%d\n", (ver >> 4) & 0xf , ver & 0xf); + + return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); +} + +static ssize_t debug_read_regs(struct file *file, char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct iommu *obj = file->private_data; + char *p, *buf; + ssize_t bytes; + + buf = kmalloc(count, GFP_KERNEL); + if (!buf) + return -ENOMEM; + p = buf; + + mutex_lock(&iommu_debug_lock); + + bytes = iommu_dump_ctx(obj, p, count); + bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes); + + mutex_unlock(&iommu_debug_lock); + kfree(buf); + + return bytes; +} + +static ssize_t debug_read_tlb(struct file *file, char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct iommu *obj = file->private_data; + char *p, *buf; + ssize_t bytes, rest; + + buf = kmalloc(count, GFP_KERNEL); + if (!buf) + return -ENOMEM; + p = buf; + + mutex_lock(&iommu_debug_lock); + + p += sprintf(p, "%8s %8s\n", "cam:", "ram:"); + p += sprintf(p, "-----------------------------------------\n"); + rest = count - (p - buf); + p += dump_tlb_entries(obj, p, rest); + + bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); + + mutex_unlock(&iommu_debug_lock); + kfree(buf); + + return bytes; +} + +static ssize_t debug_write_pagetable(struct file *file, + const char __user *userbuf, size_t count, loff_t *ppos) +{ + struct iotlb_entry e; + struct cr_regs cr; + int err; + struct iommu *obj = file->private_data; + char buf[MAXCOLUMN], *p = buf; + + count = min(count, sizeof(buf)); + + mutex_lock(&iommu_debug_lock); + if (copy_from_user(p, userbuf, count)) { + mutex_unlock(&iommu_debug_lock); + return -EFAULT; + } + + sscanf(p, "%x %x", &cr.cam, &cr.ram); + if (!cr.cam || !cr.ram) { + mutex_unlock(&iommu_debug_lock); + return -EINVAL; + } + + iotlb_cr_to_e(&cr, &e); + err = iopgtable_store_entry(obj, &e); + if (err) + dev_err(obj->dev, "%s: fail to store cr\n", __func__); + + mutex_unlock(&iommu_debug_lock); + return count; +} + +#define dump_ioptable_entry_one(lv, da, val) \ + ({ \ + int __err = 0; \ + ssize_t bytes; \ + const int maxcol = 22; \ + const char *str = "%d: %08x %08x\n"; \ + bytes = snprintf(p, maxcol, str, lv, da, val); \ + p += bytes; \ + len -= bytes; \ + if (len < maxcol) \ + __err = -ENOMEM; \ + __err; \ + }) + +static ssize_t dump_ioptable(struct iommu *obj, char *buf, ssize_t len) +{ + int i; + u32 *iopgd; + char *p = buf; + + spin_lock(&obj->page_table_lock); + + iopgd = iopgd_offset(obj, 0); + for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) { + int j, err; + u32 *iopte; + u32 da; + + if (!*iopgd) + continue; + + if (!(*iopgd & IOPGD_TABLE)) { + da = i << IOPGD_SHIFT; + + err = dump_ioptable_entry_one(1, da, *iopgd); + if (err) + goto out; + continue; + } + + iopte = iopte_offset(iopgd, 0); + + for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) { + if (!*iopte) + continue; + + da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT); + err = dump_ioptable_entry_one(2, da, *iopgd); + if (err) + goto out; + } + } +out: + spin_unlock(&obj->page_table_lock); + + return p - buf; +} + +static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct iommu *obj = file->private_data; + char *p, *buf; + size_t bytes; + + buf = (char *)__get_free_page(GFP_KERNEL); + if (!buf) + return -ENOMEM; + p = buf; + + p += sprintf(p, "L: %8s %8s\n", "da:", "pa:"); + p += sprintf(p, "-----------------------------------------\n"); + + mutex_lock(&iommu_debug_lock); + + bytes = PAGE_SIZE - (p - buf); + p += dump_ioptable(obj, p, bytes); + + bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); + + mutex_unlock(&iommu_debug_lock); + free_page((unsigned long)buf); + + return bytes; +} + +static ssize_t debug_read_mmap(struct file *file, char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct iommu *obj = file->private_data; + char *p, *buf; + struct iovm_struct *tmp; + int uninitialized_var(i); + ssize_t bytes; + + buf = (char *)__get_free_page(GFP_KERNEL); + if (!buf) + return -ENOMEM; + p = buf; + + p += sprintf(p, "%-3s %-8s %-8s %6s %8s\n", + "No", "start", "end", "size", "flags"); + p += sprintf(p, "-------------------------------------------------\n"); + + mutex_lock(&iommu_debug_lock); + + list_for_each_entry(tmp, &obj->mmap, list) { + size_t len; + const char *str = "%3d %08x-%08x %6x %8x\n"; + const int maxcol = 39; + + len = tmp->da_end - tmp->da_start; + p += snprintf(p, maxcol, str, + i, tmp->da_start, tmp->da_end, len, tmp->flags); + + if (PAGE_SIZE - (p - buf) < maxcol) + break; + i++; + } + + bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); + + mutex_unlock(&iommu_debug_lock); + free_page((unsigned long)buf); + + return bytes; +} + +static ssize_t debug_read_mem(struct file *file, char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct iommu *obj = file->private_data; + char *p, *buf; + struct iovm_struct *area; + ssize_t bytes; + + count = min_t(ssize_t, count, PAGE_SIZE); + + buf = (char *)__get_free_page(GFP_KERNEL); + if (!buf) + return -ENOMEM; + p = buf; + + mutex_lock(&iommu_debug_lock); + + area = find_iovm_area(obj, (u32)ppos); + if (IS_ERR(area)) { + bytes = -EINVAL; + goto err_out; + } + memcpy(p, area->va, count); + p += count; + + bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); +err_out: + mutex_unlock(&iommu_debug_lock); + free_page((unsigned long)buf); + + return bytes; +} + +static ssize_t debug_write_mem(struct file *file, const char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct iommu *obj = file->private_data; + struct iovm_struct *area; + char *p, *buf; + + count = min_t(size_t, count, PAGE_SIZE); + + buf = (char *)__get_free_page(GFP_KERNEL); + if (!buf) + return -ENOMEM; + p = buf; + + mutex_lock(&iommu_debug_lock); + + if (copy_from_user(p, userbuf, count)) { + count = -EFAULT; + goto err_out; + } + + area = find_iovm_area(obj, (u32)ppos); + if (IS_ERR(area)) { + count = -EINVAL; + goto err_out; + } + memcpy(area->va, p, count); +err_out: + mutex_unlock(&iommu_debug_lock); + free_page((unsigned long)buf); + + return count; +} + +static int debug_open_generic(struct inode *inode, struct file *file) +{ + file->private_data = inode->i_private; + return 0; +} + +#define DEBUG_FOPS(name) \ + static const struct file_operations debug_##name##_fops = { \ + .open = debug_open_generic, \ + .read = debug_read_##name, \ + .write = debug_write_##name, \ + }; + +#define DEBUG_FOPS_RO(name) \ + static const struct file_operations debug_##name##_fops = { \ + .open = debug_open_generic, \ + .read = debug_read_##name, \ + }; + +DEBUG_FOPS_RO(ver); +DEBUG_FOPS_RO(regs); +DEBUG_FOPS_RO(tlb); +DEBUG_FOPS(pagetable); +DEBUG_FOPS_RO(mmap); +DEBUG_FOPS(mem); + +#define __DEBUG_ADD_FILE(attr, mode) \ + { \ + struct dentry *dent; \ + dent = debugfs_create_file(#attr, mode, parent, \ + obj, &debug_##attr##_fops); \ + if (!dent) \ + return -ENOMEM; \ + } + +#define DEBUG_ADD_FILE(name) __DEBUG_ADD_FILE(name, 600) +#define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 400) + +static int iommu_debug_register(struct device *dev, void *data) +{ + struct platform_device *pdev = to_platform_device(dev); + struct iommu *obj = platform_get_drvdata(pdev); + struct dentry *d, *parent; + + if (!obj || !obj->dev) + return -EINVAL; + + d = debugfs_create_dir(obj->name, iommu_debug_root); + if (!d) + return -ENOMEM; + parent = d; + + d = debugfs_create_u8("nr_tlb_entries", 400, parent, + (u8 *)&obj->nr_tlb_entries); + if (!d) + return -ENOMEM; + + DEBUG_ADD_FILE_RO(ver); + DEBUG_ADD_FILE_RO(regs); + DEBUG_ADD_FILE_RO(tlb); + DEBUG_ADD_FILE(pagetable); + DEBUG_ADD_FILE_RO(mmap); + DEBUG_ADD_FILE(mem); + + return 0; +} + +static int __init iommu_debug_init(void) +{ + struct dentry *d; + int err; + + d = debugfs_create_dir("iommu", NULL); + if (!d) + return -ENOMEM; + iommu_debug_root = d; + + err = foreach_iommu_device(d, iommu_debug_register); + if (err) + goto err_out; + return 0; + +err_out: + debugfs_remove_recursive(iommu_debug_root); + return err; +} +module_init(iommu_debug_init) + +static void __exit iommu_debugfs_exit(void) +{ + debugfs_remove_recursive(iommu_debug_root); +} +module_exit(iommu_debugfs_exit) + +MODULE_DESCRIPTION("omap iommu: debugfs interface"); +MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/arch/arm/plat-omap/iommu.c b/arch/arm/plat-omap/iommu.c index 4a0301399013..4b6012707307 100644 --- a/arch/arm/plat-omap/iommu.c +++ b/arch/arm/plat-omap/iommu.c @@ -351,16 +351,14 @@ EXPORT_SYMBOL_GPL(flush_iotlb_all); #if defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE) -ssize_t iommu_dump_ctx(struct iommu *obj, char *buf) +ssize_t iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t bytes) { - ssize_t bytes; - if (!obj || !buf) return -EINVAL; clk_enable(obj->clk); - bytes = arch_iommu->dump_ctx(obj, buf); + bytes = arch_iommu->dump_ctx(obj, buf, bytes); clk_disable(obj->clk); @@ -368,7 +366,7 @@ ssize_t iommu_dump_ctx(struct iommu *obj, char *buf) } EXPORT_SYMBOL_GPL(iommu_dump_ctx); -static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs) +static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs, int num) { int i; struct iotlb_lock saved, l; @@ -379,7 +377,7 @@ static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs) iotlb_lock_get(obj, &saved); memcpy(&l, &saved, sizeof(saved)); - for (i = 0; i < obj->nr_tlb_entries; i++) { + for (i = 0; i < num; i++) { struct cr_regs tmp; iotlb_lock_get(obj, &l); @@ -402,18 +400,21 @@ static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs) * @obj: target iommu * @buf: output buffer **/ -size_t dump_tlb_entries(struct iommu *obj, char *buf) +size_t dump_tlb_entries(struct iommu *obj, char *buf, ssize_t bytes) { - int i, n; + int i, num; struct cr_regs *cr; char *p = buf; - cr = kcalloc(obj->nr_tlb_entries, sizeof(*cr), GFP_KERNEL); + num = bytes / sizeof(*cr); + num = min(obj->nr_tlb_entries, num); + + cr = kcalloc(num, sizeof(*cr), GFP_KERNEL); if (!cr) return 0; - n = __dump_tlb_entries(obj, cr); - for (i = 0; i < n; i++) + num = __dump_tlb_entries(obj, cr, num); + for (i = 0; i < num; i++) p += iotlb_dump_cr(obj, cr + i, p); kfree(cr); |