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drm/radeon: add VRAM debugfs access v3

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Not very fast, but makes it possible to access even the
normally inaccessible parts of VRAM from userspace.

v2: use MM_INDEX_HI for >2GB mem access, add default_llseek
v3: set inode size in the open callback

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2013-12-18 21:07:39 +01:00 committed by Alex Deucher
parent 893d6e6e12
commit 2014b56941
3 changed files with 81 additions and 1 deletions
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1
drivers/gpu/drm/radeon/evergreen_reg.h
View File

@ -33,6 +33,7 @@
#define EVERGREEN_PIF_PHY0_DATA 0xc
#define EVERGREEN_PIF_PHY1_INDEX 0x10
#define EVERGREEN_PIF_PHY1_DATA 0x14
#define EVERGREEN_MM_INDEX_HI 0x18
#define EVERGREEN_VGA_MEMORY_BASE_ADDRESS 0x310
#define EVERGREEN_VGA_MEMORY_BASE_ADDRESS_HIGH 0x324

4
drivers/gpu/drm/radeon/radeon.h
View File

@ -413,6 +413,10 @@ struct radeon_mman {
struct ttm_bo_device bdev;
bool mem_global_referenced;
bool initialized;
#if defined(CONFIG_DEBUG_FS)
struct dentry *vram;
#endif
};
/* bo virtual address in a specific vm */

77
drivers/gpu/drm/radeon/radeon_ttm.c
View File

@ -39,12 +39,14 @@
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/swiotlb.h>
#include <linux/debugfs.h>
#include "radeon_reg.h"
#include "radeon.h"
#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
static int radeon_ttm_debugfs_init(struct radeon_device *rdev);
static void radeon_ttm_debugfs_fini(struct radeon_device *rdev);
static struct radeon_device *radeon_get_rdev(struct ttm_bo_device *bdev)
{
@ -753,6 +755,7 @@ void radeon_ttm_fini(struct radeon_device *rdev)
if (!rdev->mman.initialized)
return;
radeon_ttm_debugfs_fini(rdev);
if (rdev->stollen_vga_memory) {
r = radeon_bo_reserve(rdev->stollen_vga_memory, false);
if (r == 0) {
@ -862,12 +865,75 @@ static struct drm_info_list radeon_ttm_debugfs_list[] = {
#endif
};
static int radeon_ttm_vram_open(struct inode *inode, struct file *filep)
{
struct radeon_device *rdev = inode->i_private;
i_size_write(inode, rdev->mc.mc_vram_size);
filep->private_data = inode->i_private;
return 0;
}
static ssize_t radeon_ttm_vram_read(struct file *f, char __user *buf,
size_t size, loff_t *pos)
{
struct radeon_device *rdev = f->private_data;
ssize_t result = 0;
int r;
if (size & 0x3 || *pos & 0x3)
return -EINVAL;
while (size) {
unsigned long flags;
uint32_t value;
if (*pos >= rdev->mc.mc_vram_size)
return result;
spin_lock_irqsave(&rdev->mmio_idx_lock, flags);
WREG32(RADEON_MM_INDEX, ((uint32_t)*pos) | 0x80000000);
if (rdev->family >= CHIP_CEDAR)
WREG32(EVERGREEN_MM_INDEX_HI, *pos >> 31);
value = RREG32(RADEON_MM_DATA);
spin_unlock_irqrestore(&rdev->mmio_idx_lock, flags);
r = put_user(value, (uint32_t *)buf);
if (r)
return r;
result += 4;
buf += 4;
*pos += 4;
size -= 4;
}
return result;
}
static const struct file_operations radeon_ttm_vram_fops = {
.owner = THIS_MODULE,
.open = radeon_ttm_vram_open,
.read = radeon_ttm_vram_read,
.llseek = default_llseek
};
#endif
static int radeon_ttm_debugfs_init(struct radeon_device *rdev)
{
#if defined(CONFIG_DEBUG_FS)
unsigned count = ARRAY_SIZE(radeon_ttm_debugfs_list);
unsigned count;
struct drm_minor *minor = rdev->ddev->primary;
struct dentry *ent, *root = minor->debugfs_root;
ent = debugfs_create_file("radeon_vram", S_IFREG | S_IRUGO, root,
rdev, &radeon_ttm_vram_fops);
if (IS_ERR(ent))
return PTR_ERR(ent);
rdev->mman.vram = ent;
count = ARRAY_SIZE(radeon_ttm_debugfs_list);
#ifdef CONFIG_SWIOTLB
if (!swiotlb_nr_tbl())
@ -880,3 +946,12 @@ static int radeon_ttm_debugfs_init(struct radeon_device *rdev)
return 0;
#endif
}
static void radeon_ttm_debugfs_fini(struct radeon_device *rdev)
{
#if defined(CONFIG_DEBUG_FS)
debugfs_remove(rdev->mman.vram);
rdev->mman.vram = NULL;
#endif
}