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RPI kernel 4.19 support
This commit is contained in:
Ycarus
parent
e79d4c1771
commit
e253715ce5
432 changed files with 335303 additions and 0 deletions
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@ -0,0 +1,274 @@
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From c54ab40cc2a5c576c6d06c952afcfafe231c35ca 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 059/432] 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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---
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drivers/video/fbdev/bcm2708_fb.c | 119 ++++++++++++++++++++++++++++++-
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drivers/video/fbdev/core/fbmem.c | 36 ++++++++++
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include/uapi/linux/fb.h | 12 ++++
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3 files changed, 166 insertions(+), 1 deletion(-)
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diff --git a/drivers/video/fbdev/bcm2708_fb.c b/drivers/video/fbdev/bcm2708_fb.c
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index 205cb26cac0e..6c9ee9ca8ee2 100644
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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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@@ -31,8 +31,10 @@
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#include <linux/console.h>
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#include <linux/debugfs.h>
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#include <asm/sizes.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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//#define BCM2708_FB_DEBUG
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@@ -95,6 +97,7 @@ struct bcm2708_fb {
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wait_queue_head_t dma_waitq;
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struct bcm2708_fb_stats stats;
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unsigned long fb_bus_address;
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+ struct { u32 base, length; } gpu;
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};
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#define to_bcm2708(info) container_of(info, struct bcm2708_fb, fb)
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@@ -439,7 +442,118 @@ static int bcm2708_fb_pan_display(struct fb_var_screeninfo *var,
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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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+ int burst_size = (fb->dma_chan == 0) ? 8 : 2;
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+ struct bcm2708_dma_cb *cb = fb->cb_base;
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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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+ if (size < dma_busy_wait_threshold) {
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+ bcm_dma_start(fb->dma_chan_base, fb->cb_handle);
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+ bcm_dma_wait_idle(fb->dma_chan_base);
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+ } else {
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+ void __iomem *dma_chan = fb->dma_chan_base;
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+
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+ cb->info |= BCM2708_DMA_INT_EN;
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+ bcm_dma_start(fb->dma_chan_base, fb->cb_handle);
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+ while (bcm_dma_is_busy(dma_chan)) {
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+ wait_event_interruptible(
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+ fb->dma_waitq,
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+ !bcm_dma_is_busy(dma_chan));
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+ }
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+ fb->stats.dma_irqs++;
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+ }
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+ fb->stats.dma_copies++;
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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, unsigned long arg)
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+{
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+ struct fb_dmacopy ioparam;
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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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+ /* 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)) != 0) {
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+ pr_err("[%s]: failed to copy-from-user\n",
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+ __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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+ if (fb->gpu.base == 0 || fb->gpu.length == 0) {
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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(%d)\n",
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+ __func__, 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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+ unsigned char *p = (unsigned char *)ioparam.src + offset;
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+ unsigned char *q = (unsigned char *)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",
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+ __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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struct bcm2708_fb *fb = to_bcm2708(info);
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u32 dummy = 0;
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@@ -451,6 +565,9 @@ static int bcm2708_ioctl(struct fb_info *info, unsigned int cmd, unsigned long a
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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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+ case FBIODMACOPY:
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+ ret = vc_mem_copy(fb, arg);
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+ break;
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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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diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
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index c48f083d522a..9998a69041b8 100644
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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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@@ -1081,6 +1081,31 @@ 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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+ if (!lock_fb_info(info))
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+ return -ENODEV;
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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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@@ -1091,6 +1116,7 @@ static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
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struct fb_cmap cmap_from;
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struct fb_cmap_user cmap;
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struct fb_event event;
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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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@@ -1208,6 +1234,15 @@ static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
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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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+ /* fall through */
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default:
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if (!lock_fb_info(info))
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return -ENODEV;
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@@ -1353,6 +1388,7 @@ static long fb_compat_ioctl(struct file *file, unsigned int cmd,
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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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/* fall through */
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case FBIOBLANK:
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diff --git a/include/uapi/linux/fb.h b/include/uapi/linux/fb.h
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index 6cd9b198b7c6..f36c92c2da74 100644
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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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@@ -347,6 +353,12 @@ 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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--
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2.19.1
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