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Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0040-fbdev-add-FBIOCOPYAREA-ioctl.patch')
-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0040-fbdev-add-FBIOCOPYAREA-ioctl.patch327
1 files changed, 327 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0040-fbdev-add-FBIOCOPYAREA-ioctl.patch b/target/linux/bcm27xx/patches-5.4/950-0040-fbdev-add-FBIOCOPYAREA-ioctl.patch
new file mode 100644
index 0000000000..8fa4ddf5c8
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0040-fbdev-add-FBIOCOPYAREA-ioctl.patch
@@ -0,0 +1,327 @@
+From 764b96cc27c293fb37a8b9031ddb25290974e3a2 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 | 167 ++++++++++++++++++++++++++++++-
+ drivers/video/fbdev/core/fbmem.c | 35 +++++++
+ include/uapi/linux/fb.h | 12 +++
+ 3 files changed, 213 insertions(+), 1 deletion(-)
+
+--- 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>
+
+@@ -613,7 +615,110 @@ 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)
+ {
+@@ -629,6 +734,21 @@ 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;
+@@ -639,6 +759,48 @@ 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)
+ {
+@@ -831,6 +993,9 @@ 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
+@@ -1076,6 +1076,30 @@ 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)
+ {
+@@ -1084,6 +1108,7 @@ 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;
+
+@@ -1159,6 +1184,15 @@ 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;
+@@ -1304,6 +1338,7 @@ static long fb_compat_ioctl(struct file
+ case FBIOPAN_DISPLAY:
+ case FBIOGET_CON2FBMAP:
+ case FBIOPUT_CON2FBMAP:
++ case FBIOCOPYAREA:
+ arg = (unsigned long) compat_ptr(arg);
+ /* fall through */
+ 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 */
+@@ -347,6 +353,12 @@ struct fb_copyarea {
+ __u32 sy;
+ };
+
++struct fb_dmacopy {
++ void *dst;
++ __u32 src;
++ __u32 length;
++};
++
+ struct fb_fillrect {
+ __u32 dx; /* screen-relative */
+ __u32 dy;
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-28 07:08:52 +0000