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openwrt/target/linux/bcm27xx/patches-5.10/950-0043-fbdev-add-FBIOCOPY...

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From 6005247285065235845f233077bbeedb19a484c7 Mon Sep 17 00:00:00 2001
From: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Date: Mon, 17 Jun 2013 13:32:11 +0300
Subject: [PATCH] fbdev: add FBIOCOPYAREA ioctl
Based on the patch authored by Ali Gholami Rudi at
https://lkml.org/lkml/2009/7/13/153
Provide an ioctl for userspace applications, but only if this operation
is hardware accelerated (otherwide it does not make any sense).
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
bcm2708_fb: Add ioctl for reading gpu memory through dma
video: bcm2708_fb: Add compat_ioctl support.
When using a 64 bit kernel with 32 bit userspace we need
compat ioctl handling for FBIODMACOPY as one of the
parameters is a pointer.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
drivers/video/fbdev/bcm2708_fb.c | 170 ++++++++++++++++++++++++++++++-
drivers/video/fbdev/core/fbmem.c | 35 +++++++
include/uapi/linux/fb.h | 12 +++
3 files changed, 213 insertions(+), 4 deletions(-)
--- a/drivers/video/fbdev/bcm2708_fb.c
+++ b/drivers/video/fbdev/bcm2708_fb.c
@@ -32,8 +32,10 @@
#include <linux/printk.h>
#include <linux/console.h>
#include <linux/debugfs.h>
+#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
+#include <linux/cred.h>
#include <soc/bcm2835/raspberrypi-firmware.h>
#include <linux/mutex.h>
@@ -184,9 +186,6 @@ static int bcm2708_fb_debugfs_init(struc
fb->debugfs_subdir = debugfs_create_dir(buf, fb->debugfs_dir);
- debugfs_create_regset32("stats", 0444, fb->debugfs_dir,
- &fb->stats.regset);
-
if (!fb->debugfs_subdir) {
dev_warn(fb->fb.dev, "%s: could not create debugfs entry %u\n",
__func__, fb->display_settings.display_num);
@@ -603,7 +602,110 @@ static int bcm2708_fb_pan_display(struct
return result;
}
-static int bcm2708_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
+static void dma_memcpy(struct bcm2708_fb *fb, dma_addr_t dst, dma_addr_t src,
+ int size)
+{
+ struct bcm2708_fb_dev *fbdev = fb->fbdev;
+ struct bcm2708_dma_cb *cb = fbdev->cb_base;
+ int burst_size = (fbdev->dma_chan == 0) ? 8 : 2;
+
+ cb->info = BCM2708_DMA_BURST(burst_size) | BCM2708_DMA_S_WIDTH |
+ BCM2708_DMA_S_INC | BCM2708_DMA_D_WIDTH |
+ BCM2708_DMA_D_INC;
+ cb->dst = dst;
+ cb->src = src;
+ cb->length = size;
+ cb->stride = 0;
+ cb->pad[0] = 0;
+ cb->pad[1] = 0;
+ cb->next = 0;
+
+ // Not sure what to do if this gets a signal whilst waiting
+ if (mutex_lock_interruptible(&fbdev->dma_mutex))
+ return;
+
+ if (size < dma_busy_wait_threshold) {
+ bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle);
+ bcm_dma_wait_idle(fbdev->dma_chan_base);
+ } else {
+ void __iomem *local_dma_chan = fbdev->dma_chan_base;
+
+ cb->info |= BCM2708_DMA_INT_EN;
+ bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle);
+ while (bcm_dma_is_busy(local_dma_chan)) {
+ wait_event_interruptible(fbdev->dma_waitq,
+ !bcm_dma_is_busy(local_dma_chan));
+ }
+ fbdev->dma_stats.dma_irqs++;
+ }
+ fbdev->dma_stats.dma_copies++;
+
+ mutex_unlock(&fbdev->dma_mutex);
+}
+
+/* address with no aliases */
+#define INTALIAS_NORMAL(x) ((x) & ~0xc0000000)
+/* cache coherent but non-allocating in L1 and L2 */
+#define INTALIAS_L1L2_NONALLOCATING(x) (((x) & ~0xc0000000) | 0x80000000)
+
+static long vc_mem_copy(struct bcm2708_fb *fb, struct fb_dmacopy *ioparam)
+{
+ size_t size = PAGE_SIZE;
+ u32 *buf = NULL;
+ dma_addr_t bus_addr;
+ long rc = 0;
+ size_t offset;
+
+ /* restrict this to root user */
+ if (!uid_eq(current_euid(), GLOBAL_ROOT_UID)) {
+ rc = -EFAULT;
+ goto out;
+ }
+
+ if (!fb->gpu.base || !fb->gpu.length) {
+ pr_err("[%s]: Unable to determine gpu memory (%x,%x)\n",
+ __func__, fb->gpu.base, fb->gpu.length);
+ return -EFAULT;
+ }
+
+ if (INTALIAS_NORMAL(ioparam->src) < fb->gpu.base ||
+ INTALIAS_NORMAL(ioparam->src) >= fb->gpu.base + fb->gpu.length) {
+ pr_err("[%s]: Invalid memory access %x (%x-%x)", __func__,
+ INTALIAS_NORMAL(ioparam->src), fb->gpu.base,
+ fb->gpu.base + fb->gpu.length);
+ return -EFAULT;
+ }
+
+ buf = dma_alloc_coherent(fb->fb.device, PAGE_ALIGN(size), &bus_addr,
+ GFP_ATOMIC);
+ if (!buf) {
+ pr_err("[%s]: failed to dma_alloc_coherent(%zd)\n", __func__,
+ size);
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ for (offset = 0; offset < ioparam->length; offset += size) {
+ size_t remaining = ioparam->length - offset;
+ size_t s = min(size, remaining);
+ u8 *p = (u8 *)((uintptr_t)ioparam->src + offset);
+ u8 *q = (u8 *)ioparam->dst + offset;
+
+ dma_memcpy(fb, bus_addr,
+ INTALIAS_L1L2_NONALLOCATING((dma_addr_t)p), size);
+ if (copy_to_user(q, buf, s) != 0) {
+ pr_err("[%s]: failed to copy-to-user\n", __func__);
+ rc = -EFAULT;
+ goto out;
+ }
+ }
+out:
+ if (buf)
+ dma_free_coherent(fb->fb.device, PAGE_ALIGN(size), buf,
+ bus_addr);
+ return rc;
+}
+
static int bcm2708_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
@@ -619,6 +721,21 @@ static int bcm2708_ioctl(struct fb_info
RPI_FIRMWARE_FRAMEBUFFER_SET_VSYNC,
&dummy, sizeof(dummy));
break;
+
+ case FBIODMACOPY:
+ {
+ struct fb_dmacopy ioparam;
+ /* Get the parameter data.
+ */
+ if (copy_from_user
+ (&ioparam, (void *)arg, sizeof(ioparam))) {
+ pr_err("[%s]: failed to copy-from-user\n", __func__);
+ ret = -EFAULT;
+ break;
+ }
+ ret = vc_mem_copy(fb, &ioparam);
+ break;
+ }
default:
dev_dbg(info->device, "Unknown ioctl 0x%x\n", cmd);
return -ENOTTY;
@@ -629,6 +746,48 @@ static int bcm2708_ioctl(struct fb_info
return ret;
}
+
+#ifdef CONFIG_COMPAT
+struct fb_dmacopy32 {
+ compat_uptr_t dst;
+ __u32 src;
+ __u32 length;
+};
+
+#define FBIODMACOPY32 _IOW('z', 0x22, struct fb_dmacopy32)
+
+static int bcm2708_compat_ioctl(struct fb_info *info, unsigned int cmd,
+ unsigned long arg)
+{
+ struct bcm2708_fb *fb = to_bcm2708(info);
+ int ret;
+
+ switch (cmd) {
+ case FBIODMACOPY32:
+ {
+ struct fb_dmacopy32 param32;
+ struct fb_dmacopy param;
+ /* Get the parameter data.
+ */
+ if (copy_from_user(&param32, (void *)arg, sizeof(param32))) {
+ pr_err("[%s]: failed to copy-from-user\n", __func__);
+ ret = -EFAULT;
+ break;
+ }
+ param.dst = compat_ptr(param32.dst);
+ param.src = param32.src;
+ param.length = param32.length;
+ ret = vc_mem_copy(fb, &param);
+ break;
+ }
+ default:
+ ret = bcm2708_ioctl(info, cmd, arg);
+ break;
+ }
+ return ret;
+}
+#endif
+
static void bcm2708_fb_fillrect(struct fb_info *info,
const struct fb_fillrect *rect)
{
@@ -821,6 +980,9 @@ static struct fb_ops bcm2708_fb_ops = {
.fb_imageblit = bcm2708_fb_imageblit,
.fb_pan_display = bcm2708_fb_pan_display,
.fb_ioctl = bcm2708_ioctl,
+#ifdef CONFIG_COMPAT
+ .fb_compat_ioctl = bcm2708_compat_ioctl,
+#endif
};
static int bcm2708_fb_register(struct bcm2708_fb *fb)
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1079,6 +1079,30 @@ fb_blank(struct fb_info *info, int blank
}
EXPORT_SYMBOL(fb_blank);
+static int fb_copyarea_user(struct fb_info *info,
+ struct fb_copyarea *copy)
+{
+ int ret = 0;
+ lock_fb_info(info);
+ if (copy->dx >= info->var.xres ||
+ copy->sx >= info->var.xres ||
+ copy->width > info->var.xres ||
+ copy->dy >= info->var.yres ||
+ copy->sy >= info->var.yres ||
+ copy->height > info->var.yres ||
+ copy->dx + copy->width > info->var.xres ||
+ copy->sx + copy->width > info->var.xres ||
+ copy->dy + copy->height > info->var.yres ||
+ copy->sy + copy->height > info->var.yres) {
+ ret = -EINVAL;
+ goto out;
+ }
+ info->fbops->fb_copyarea(info, copy);
+out:
+ unlock_fb_info(info);
+ return ret;
+}
+
static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
@@ -1087,6 +1111,7 @@ static long do_fb_ioctl(struct fb_info *
struct fb_fix_screeninfo fix;
struct fb_cmap cmap_from;
struct fb_cmap_user cmap;
+ struct fb_copyarea copy;
void __user *argp = (void __user *)arg;
long ret = 0;
@@ -1162,6 +1187,15 @@ static long do_fb_ioctl(struct fb_info *
unlock_fb_info(info);
console_unlock();
break;
+ case FBIOCOPYAREA:
+ if (info->flags & FBINFO_HWACCEL_COPYAREA) {
+ /* only provide this ioctl if it is accelerated */
+ if (copy_from_user(&copy, argp, sizeof(copy)))
+ return -EFAULT;
+ ret = fb_copyarea_user(info, &copy);
+ break;
+ }
+ /* fall through */
default:
lock_fb_info(info);
fb = info->fbops;
@@ -1307,6 +1341,7 @@ static long fb_compat_ioctl(struct file
case FBIOPAN_DISPLAY:
case FBIOGET_CON2FBMAP:
case FBIOPUT_CON2FBMAP:
+ case FBIOCOPYAREA:
arg = (unsigned long) compat_ptr(arg);
fallthrough;
case FBIOBLANK:
--- a/include/uapi/linux/fb.h
+++ b/include/uapi/linux/fb.h
@@ -35,6 +35,12 @@
#define FBIOPUT_MODEINFO 0x4617
#define FBIOGET_DISPINFO 0x4618
#define FBIO_WAITFORVSYNC _IOW('F', 0x20, __u32)
+/*
+ * HACK: use 'z' in order not to clash with any other ioctl numbers which might
+ * be concurrently added to the mainline kernel
+ */
+#define FBIOCOPYAREA _IOW('z', 0x21, struct fb_copyarea)
+#define FBIODMACOPY _IOW('z', 0x22, struct fb_dmacopy)
#define FB_TYPE_PACKED_PIXELS 0 /* Packed Pixels */
#define FB_TYPE_PLANES 1 /* Non interleaved planes */
@@ -348,6 +354,12 @@ struct fb_copyarea {
__u32 sy;
};
+struct fb_dmacopy {
+ void *dst;
+ __u32 src;
+ __u32 length;
+};
+
struct fb_fillrect {
__u32 dx; /* screen-relative */
__u32 dy;
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