From 2014b5694182b54c781b93d26ec993f8a12bca01 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Christian=20K=C3=B6nig?= Date: Wed, 18 Dec 2013 21:07:39 +0100 Subject: [PATCH] drm/radeon: add VRAM debugfs access v3 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Alex Deucher --- drivers/gpu/drm/radeon/evergreen_reg.h | 1 + drivers/gpu/drm/radeon/radeon.h | 4 ++ drivers/gpu/drm/radeon/radeon_ttm.c | 77 +++++++++++++++++++++++++- 3 files changed, 81 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/radeon/evergreen_reg.h b/drivers/gpu/drm/radeon/evergreen_reg.h index 8a4e641f0e3c..a0f63ff5a5e9 100644 --- a/drivers/gpu/drm/radeon/evergreen_reg.h +++ b/drivers/gpu/drm/radeon/evergreen_reg.h @@ -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 diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h index b1f990d0eaa1..49f210c14796 100644 --- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -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 */ diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c index 20592378b6d0..a29d7cbd62e7 100644 --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -39,12 +39,14 @@ #include #include #include +#include #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 +} -- 2.30.2