mirror of
https://github.com/Ysurac/openmptcprouter.git
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337 lines
9.3 KiB
Diff
337 lines
9.3 KiB
Diff
From 8fb5c07422b637ebab328fc551998f9ea86aace6 Mon Sep 17 00:00:00 2001
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From: Siarhei Siamashka <siarhei.siamashka@gmail.com>
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Date: Mon, 17 Jun 2013 13:32:11 +0300
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Subject: [PATCH] fbdev: add FBIOCOPYAREA ioctl
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Based on the patch authored by Ali Gholami Rudi at
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https://lkml.org/lkml/2009/7/13/153
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Provide an ioctl for userspace applications, but only if this operation
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is hardware accelerated (otherwide it does not make any sense).
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Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
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bcm2708_fb: Add ioctl for reading gpu memory through dma
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video: bcm2708_fb: Add compat_ioctl support.
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When using a 64 bit kernel with 32 bit userspace we need
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compat ioctl handling for FBIODMACOPY as one of the
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parameters is a pointer.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
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---
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drivers/video/fbdev/bcm2708_fb.c | 170 ++++++++++++++++++++++++++++++-
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drivers/video/fbdev/core/fbmem.c | 35 +++++++
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include/uapi/linux/fb.h | 12 +++
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3 files changed, 213 insertions(+), 4 deletions(-)
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--- a/drivers/video/fbdev/bcm2708_fb.c
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+++ b/drivers/video/fbdev/bcm2708_fb.c
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@@ -32,8 +32,10 @@
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#include <linux/printk.h>
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#include <linux/console.h>
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#include <linux/debugfs.h>
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+#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/dma-mapping.h>
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+#include <linux/cred.h>
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#include <soc/bcm2835/raspberrypi-firmware.h>
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#include <linux/mutex.h>
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@@ -184,9 +186,6 @@ static int bcm2708_fb_debugfs_init(struc
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fb->debugfs_subdir = debugfs_create_dir(buf, fb->debugfs_dir);
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- debugfs_create_regset32("stats", 0444, fb->debugfs_dir,
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- &fb->stats.regset);
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-
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if (!fb->debugfs_subdir) {
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dev_warn(fb->fb.dev, "%s: could not create debugfs entry %u\n",
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__func__, fb->display_settings.display_num);
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@@ -603,7 +602,110 @@ static int bcm2708_fb_pan_display(struct
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return result;
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}
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-static int bcm2708_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
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+static void dma_memcpy(struct bcm2708_fb *fb, dma_addr_t dst, dma_addr_t src,
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+ int size)
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+{
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+ struct bcm2708_fb_dev *fbdev = fb->fbdev;
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+ struct bcm2708_dma_cb *cb = fbdev->cb_base;
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+ int burst_size = (fbdev->dma_chan == 0) ? 8 : 2;
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+
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+ cb->info = BCM2708_DMA_BURST(burst_size) | BCM2708_DMA_S_WIDTH |
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+ BCM2708_DMA_S_INC | BCM2708_DMA_D_WIDTH |
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+ BCM2708_DMA_D_INC;
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+ cb->dst = dst;
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+ cb->src = src;
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+ cb->length = size;
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+ cb->stride = 0;
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+ cb->pad[0] = 0;
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+ cb->pad[1] = 0;
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+ cb->next = 0;
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+
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+ // Not sure what to do if this gets a signal whilst waiting
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+ if (mutex_lock_interruptible(&fbdev->dma_mutex))
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+ return;
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+
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+ if (size < dma_busy_wait_threshold) {
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+ bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle);
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+ bcm_dma_wait_idle(fbdev->dma_chan_base);
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+ } else {
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+ void __iomem *local_dma_chan = fbdev->dma_chan_base;
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+
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+ cb->info |= BCM2708_DMA_INT_EN;
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+ bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle);
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+ while (bcm_dma_is_busy(local_dma_chan)) {
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+ wait_event_interruptible(fbdev->dma_waitq,
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+ !bcm_dma_is_busy(local_dma_chan));
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+ }
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+ fbdev->dma_stats.dma_irqs++;
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+ }
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+ fbdev->dma_stats.dma_copies++;
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+
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+ mutex_unlock(&fbdev->dma_mutex);
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+}
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+
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+/* address with no aliases */
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+#define INTALIAS_NORMAL(x) ((x) & ~0xc0000000)
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+/* cache coherent but non-allocating in L1 and L2 */
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+#define INTALIAS_L1L2_NONALLOCATING(x) (((x) & ~0xc0000000) | 0x80000000)
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+
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+static long vc_mem_copy(struct bcm2708_fb *fb, struct fb_dmacopy *ioparam)
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+{
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+ size_t size = PAGE_SIZE;
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+ u32 *buf = NULL;
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+ dma_addr_t bus_addr;
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+ long rc = 0;
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+ size_t offset;
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+
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+ /* restrict this to root user */
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+ if (!uid_eq(current_euid(), GLOBAL_ROOT_UID)) {
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+ rc = -EFAULT;
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+ goto out;
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+ }
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+
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+ if (!fb->gpu.base || !fb->gpu.length) {
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+ pr_err("[%s]: Unable to determine gpu memory (%x,%x)\n",
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+ __func__, fb->gpu.base, fb->gpu.length);
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+ return -EFAULT;
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+ }
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+
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+ if (INTALIAS_NORMAL(ioparam->src) < fb->gpu.base ||
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+ INTALIAS_NORMAL(ioparam->src) >= fb->gpu.base + fb->gpu.length) {
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+ pr_err("[%s]: Invalid memory access %x (%x-%x)", __func__,
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+ INTALIAS_NORMAL(ioparam->src), fb->gpu.base,
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+ fb->gpu.base + fb->gpu.length);
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+ return -EFAULT;
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+ }
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+
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+ buf = dma_alloc_coherent(fb->fb.device, PAGE_ALIGN(size), &bus_addr,
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+ GFP_ATOMIC);
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+ if (!buf) {
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+ pr_err("[%s]: failed to dma_alloc_coherent(%zd)\n", __func__,
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+ size);
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+ rc = -ENOMEM;
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+ goto out;
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+ }
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+
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+ for (offset = 0; offset < ioparam->length; offset += size) {
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+ size_t remaining = ioparam->length - offset;
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+ size_t s = min(size, remaining);
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+ u8 *p = (u8 *)((uintptr_t)ioparam->src + offset);
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+ u8 *q = (u8 *)ioparam->dst + offset;
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+
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+ dma_memcpy(fb, bus_addr,
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+ INTALIAS_L1L2_NONALLOCATING((dma_addr_t)p), size);
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+ if (copy_to_user(q, buf, s) != 0) {
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+ pr_err("[%s]: failed to copy-to-user\n", __func__);
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+ rc = -EFAULT;
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+ goto out;
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+ }
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+ }
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+out:
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+ if (buf)
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+ dma_free_coherent(fb->fb.device, PAGE_ALIGN(size), buf,
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+ bus_addr);
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+ return rc;
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+}
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+
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static int bcm2708_ioctl(struct fb_info *info, unsigned int cmd,
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unsigned long arg)
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{
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@@ -619,6 +721,21 @@ static int bcm2708_ioctl(struct fb_info
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RPI_FIRMWARE_FRAMEBUFFER_SET_VSYNC,
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&dummy, sizeof(dummy));
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break;
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+
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+ case FBIODMACOPY:
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+ {
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+ struct fb_dmacopy ioparam;
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+ /* Get the parameter data.
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+ */
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+ if (copy_from_user
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+ (&ioparam, (void *)arg, sizeof(ioparam))) {
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+ pr_err("[%s]: failed to copy-from-user\n", __func__);
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+ ret = -EFAULT;
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+ break;
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+ }
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+ ret = vc_mem_copy(fb, &ioparam);
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+ break;
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+ }
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default:
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dev_dbg(info->device, "Unknown ioctl 0x%x\n", cmd);
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return -ENOTTY;
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@@ -629,6 +746,48 @@ static int bcm2708_ioctl(struct fb_info
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return ret;
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}
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+
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+#ifdef CONFIG_COMPAT
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+struct fb_dmacopy32 {
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+ compat_uptr_t dst;
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+ __u32 src;
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+ __u32 length;
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+};
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+
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+#define FBIODMACOPY32 _IOW('z', 0x22, struct fb_dmacopy32)
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+
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+static int bcm2708_compat_ioctl(struct fb_info *info, unsigned int cmd,
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+ unsigned long arg)
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+{
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+ struct bcm2708_fb *fb = to_bcm2708(info);
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+ int ret;
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+
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+ switch (cmd) {
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+ case FBIODMACOPY32:
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+ {
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+ struct fb_dmacopy32 param32;
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+ struct fb_dmacopy param;
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+ /* Get the parameter data.
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+ */
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+ if (copy_from_user(¶m32, (void *)arg, sizeof(param32))) {
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+ pr_err("[%s]: failed to copy-from-user\n", __func__);
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+ ret = -EFAULT;
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+ break;
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+ }
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+ param.dst = compat_ptr(param32.dst);
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+ param.src = param32.src;
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+ param.length = param32.length;
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+ ret = vc_mem_copy(fb, ¶m);
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+ break;
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+ }
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+ default:
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+ ret = bcm2708_ioctl(info, cmd, arg);
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+ break;
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+ }
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+ return ret;
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+}
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+#endif
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+
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static void bcm2708_fb_fillrect(struct fb_info *info,
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const struct fb_fillrect *rect)
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{
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@@ -821,6 +980,9 @@ static struct fb_ops bcm2708_fb_ops = {
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.fb_imageblit = bcm2708_fb_imageblit,
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.fb_pan_display = bcm2708_fb_pan_display,
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.fb_ioctl = bcm2708_ioctl,
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+#ifdef CONFIG_COMPAT
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+ .fb_compat_ioctl = bcm2708_compat_ioctl,
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+#endif
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};
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static int bcm2708_fb_register(struct bcm2708_fb *fb)
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--- a/drivers/video/fbdev/core/fbmem.c
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+++ b/drivers/video/fbdev/core/fbmem.c
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@@ -1094,6 +1094,30 @@ fb_blank(struct fb_info *info, int blank
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}
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EXPORT_SYMBOL(fb_blank);
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+static int fb_copyarea_user(struct fb_info *info,
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+ struct fb_copyarea *copy)
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+{
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+ int ret = 0;
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+ lock_fb_info(info);
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+ if (copy->dx >= info->var.xres ||
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+ copy->sx >= info->var.xres ||
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+ copy->width > info->var.xres ||
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+ copy->dy >= info->var.yres ||
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+ copy->sy >= info->var.yres ||
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+ copy->height > info->var.yres ||
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+ copy->dx + copy->width > info->var.xres ||
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+ copy->sx + copy->width > info->var.xres ||
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+ copy->dy + copy->height > info->var.yres ||
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+ copy->sy + copy->height > info->var.yres) {
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+ ret = -EINVAL;
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+ goto out;
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+ }
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+ info->fbops->fb_copyarea(info, copy);
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+out:
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+ unlock_fb_info(info);
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+ return ret;
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+}
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+
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static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
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unsigned long arg)
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{
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@@ -1102,6 +1126,7 @@ static long do_fb_ioctl(struct fb_info *
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struct fb_fix_screeninfo fix;
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struct fb_cmap cmap_from;
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struct fb_cmap_user cmap;
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+ struct fb_copyarea copy;
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void __user *argp = (void __user *)arg;
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long ret = 0;
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@@ -1183,6 +1208,15 @@ static long do_fb_ioctl(struct fb_info *
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unlock_fb_info(info);
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console_unlock();
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break;
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+ case FBIOCOPYAREA:
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+ if (info->flags & FBINFO_HWACCEL_COPYAREA) {
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+ /* only provide this ioctl if it is accelerated */
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+ if (copy_from_user(©, argp, sizeof(copy)))
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+ return -EFAULT;
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+ ret = fb_copyarea_user(info, ©);
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+ break;
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+ }
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+ fallthrough;
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default:
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lock_fb_info(info);
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fb = info->fbops;
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@@ -1322,6 +1356,7 @@ static long fb_compat_ioctl(struct file
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case FBIOPAN_DISPLAY:
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case FBIOGET_CON2FBMAP:
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case FBIOPUT_CON2FBMAP:
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+ case FBIOCOPYAREA:
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arg = (unsigned long) compat_ptr(arg);
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fallthrough;
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case FBIOBLANK:
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--- a/include/uapi/linux/fb.h
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+++ b/include/uapi/linux/fb.h
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@@ -35,6 +35,12 @@
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#define FBIOPUT_MODEINFO 0x4617
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#define FBIOGET_DISPINFO 0x4618
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#define FBIO_WAITFORVSYNC _IOW('F', 0x20, __u32)
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+/*
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+ * HACK: use 'z' in order not to clash with any other ioctl numbers which might
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+ * be concurrently added to the mainline kernel
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+ */
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+#define FBIOCOPYAREA _IOW('z', 0x21, struct fb_copyarea)
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+#define FBIODMACOPY _IOW('z', 0x22, struct fb_dmacopy)
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#define FB_TYPE_PACKED_PIXELS 0 /* Packed Pixels */
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#define FB_TYPE_PLANES 1 /* Non interleaved planes */
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@@ -348,6 +354,12 @@ struct fb_copyarea {
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__u32 sy;
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};
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+struct fb_dmacopy {
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+ void *dst;
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+ __u32 src;
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+ __u32 length;
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+};
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+
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struct fb_fillrect {
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__u32 dx; /* screen-relative */
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__u32 dy;
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