--- /dev/null
+From d5c6191cc94b358de183cc8c88a5722a79445202 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Thu, 1 Nov 2018 17:31:37 +0000
+Subject: [PATCH] vchiq: Add 36-bit address support
+
+Conditional on a new compatible string, change the pagelist encoding
+such that the top 24 bits are the pfn, leaving 8 bits for run length
+(-1).
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ .../interface/vchiq_arm/vchiq_2835_arm.c | 90 ++++++++++++++-----
+ .../interface/vchiq_arm/vchiq_arm.c | 6 ++
+ .../interface/vchiq_arm/vchiq_arm.h | 1 +
+ 3 files changed, 75 insertions(+), 22 deletions(-)
+
+--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
++++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
+@@ -47,6 +47,8 @@
+ #include <soc/bcm2835/raspberrypi-firmware.h>
+
+ #define TOTAL_SLOTS (VCHIQ_SLOT_ZERO_SLOTS + 2 * 32)
++#define VC_SAFE(x) (g_use_36bit_addrs ? ((u32)(x) | 0xc0000000) : (u32)(x))
++#define IS_VC_SAFE(x) (g_use_36bit_addrs ? !((x) & ~0x3fffffffull) : 1)
+
+ #include "vchiq_arm.h"
+ #include "vchiq_connected.h"
+@@ -96,6 +98,7 @@ static void __iomem *g_regs;
+ */
+ static unsigned int g_cache_line_size;
+ static struct dma_pool *g_dma_pool;
++static unsigned int g_use_36bit_addrs = 0;
+ static unsigned int g_fragments_size;
+ static char *g_fragments_base;
+ static char *g_free_fragments;
+@@ -139,6 +142,8 @@ int vchiq_platform_init(struct platform_
+ g_cache_line_size = drvdata->cache_line_size;
+ g_fragments_size = 2 * g_cache_line_size;
+
++ g_use_36bit_addrs = (dev->dma_pfn_offset == 0);
++
+ /* Allocate space for the channels in coherent memory */
+ slot_mem_size = PAGE_ALIGN(TOTAL_SLOTS * VCHIQ_SLOT_SIZE);
+ frag_mem_size = PAGE_ALIGN(g_fragments_size * MAX_FRAGMENTS);
+@@ -150,14 +155,21 @@ int vchiq_platform_init(struct platform_
+ return -ENOMEM;
+ }
+
++ if (!IS_VC_SAFE(slot_phys)) {
++ dev_err(dev, "allocated DMA memory %pad is not VC-safe\n",
++ &slot_phys);
++ return -ENOMEM;
++ }
++
+ WARN_ON(((unsigned long)slot_mem & (PAGE_SIZE - 1)) != 0);
++ channelbase = VC_SAFE(slot_phys);
+
+ vchiq_slot_zero = vchiq_init_slots(slot_mem, slot_mem_size);
+ if (!vchiq_slot_zero)
+ return -EINVAL;
+
+ vchiq_slot_zero->platform_data[VCHIQ_PLATFORM_FRAGMENTS_OFFSET_IDX] =
+- (int)slot_phys + slot_mem_size;
++ channelbase + slot_mem_size;
+ vchiq_slot_zero->platform_data[VCHIQ_PLATFORM_FRAGMENTS_COUNT_IDX] =
+ MAX_FRAGMENTS;
+
+@@ -193,7 +205,6 @@ int vchiq_platform_init(struct platform_
+ }
+
+ /* Send the base address of the slots to VideoCore */
+- channelbase = slot_phys;
+ err = rpi_firmware_property(fw, RPI_FIRMWARE_VCHIQ_INIT,
+ &channelbase, sizeof(channelbase));
+ if (err || channelbase) {
+@@ -282,7 +293,7 @@ vchiq_prepare_bulk_data(VCHIQ_BULK_T *bu
+ return VCHIQ_ERROR;
+
+ bulk->handle = memhandle;
+- bulk->data = (void *)(unsigned long)pagelistinfo->dma_addr;
++ bulk->data = (void *)VC_SAFE(pagelistinfo->dma_addr);
+
+ /*
+ * Store the pagelistinfo address in remote_data,
+@@ -570,25 +581,60 @@ create_pagelist(char __user *buf, size_t
+
+ /* Combine adjacent blocks for performance */
+ k = 0;
+- for_each_sg(scatterlist, sg, dma_buffers, i) {
+- u32 len = sg_dma_len(sg);
+- u32 addr = sg_dma_address(sg);
+-
+- /* Note: addrs is the address + page_count - 1
+- * The firmware expects blocks after the first to be page-
+- * aligned and a multiple of the page size
+- */
+- WARN_ON(len == 0);
+- WARN_ON(i && (i != (dma_buffers - 1)) && (len & ~PAGE_MASK));
+- WARN_ON(i && (addr & ~PAGE_MASK));
+- if (k > 0 &&
+- ((addrs[k - 1] & PAGE_MASK) +
+- (((addrs[k - 1] & ~PAGE_MASK) + 1) << PAGE_SHIFT))
+- == (addr & PAGE_MASK))
+- addrs[k - 1] += ((len + PAGE_SIZE - 1) >> PAGE_SHIFT);
+- else
+- addrs[k++] = (addr & PAGE_MASK) |
+- (((len + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1);
++ if (g_use_36bit_addrs) {
++ for_each_sg(scatterlist, sg, dma_buffers, i) {
++ u32 len = sg_dma_len(sg);
++ u64 addr = sg_dma_address(sg);
++ u32 page_id = (u32)((addr >> 4) & ~0xff);
++ u32 sg_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
++
++ /* Note: addrs is the address + page_count - 1
++ * The firmware expects blocks after the first to be page-
++ * aligned and a multiple of the page size
++ */
++ WARN_ON(len == 0);
++ WARN_ON(i &&
++ (i != (dma_buffers - 1)) && (len & ~PAGE_MASK));
++ WARN_ON(i && (addr & ~PAGE_MASK));
++ WARN_ON(upper_32_bits(addr) > 0xf);
++ if (k > 0 &&
++ ((addrs[k - 1] & ~0xff) +
++ (((addrs[k - 1] & 0xff) + 1) << 8)
++ == page_id)) {
++ u32 inc_pages = min(sg_pages,
++ 0xff - (addrs[k - 1] & 0xff));
++ addrs[k - 1] += inc_pages;
++ page_id += inc_pages << 8;
++ sg_pages -= inc_pages;
++ }
++ while (sg_pages) {
++ u32 inc_pages = min(sg_pages, 0x100u);
++ addrs[k++] = page_id | (inc_pages - 1);
++ page_id += inc_pages << 8;
++ sg_pages -= inc_pages;
++ }
++ }
++ } else {
++ for_each_sg(scatterlist, sg, dma_buffers, i) {
++ u32 len = sg_dma_len(sg);
++ u32 addr = VC_SAFE(sg_dma_address(sg));
++ u32 new_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
++
++ /* Note: addrs is the address + page_count - 1
++ * The firmware expects blocks after the first to be page-
++ * aligned and a multiple of the page size
++ */
++ WARN_ON(len == 0);
++ WARN_ON(i && (i != (dma_buffers - 1)) && (len & ~PAGE_MASK));
++ WARN_ON(i && (addr & ~PAGE_MASK));
++ if (k > 0 &&
++ ((addrs[k - 1] & PAGE_MASK) +
++ (((addrs[k - 1] & ~PAGE_MASK) + 1) << PAGE_SHIFT))
++ == (addr & PAGE_MASK))
++ addrs[k - 1] += new_pages;
++ else
++ addrs[k++] = (addr & PAGE_MASK) | (new_pages - 1);
++ }
+ }
+
+ /* Partial cache lines (fragments) require special measures */
+--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
++++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+@@ -181,6 +181,11 @@ static struct vchiq_drvdata bcm2836_drvd
+ .cache_line_size = 64,
+ };
+
++static struct vchiq_drvdata bcm2838_drvdata = {
++ .cache_line_size = 64,
++ .use_36bit_addrs = true,
++};
++
+ static const char *const ioctl_names[] = {
+ "CONNECT",
+ "SHUTDOWN",
+@@ -3618,6 +3623,7 @@ vchiq_register_child(struct platform_dev
+ static const struct of_device_id vchiq_of_match[] = {
+ { .compatible = "brcm,bcm2835-vchiq", .data = &bcm2835_drvdata },
+ { .compatible = "brcm,bcm2836-vchiq", .data = &bcm2836_drvdata },
++ { .compatible = "brcm,bcm2838-vchiq", .data = &bcm2838_drvdata },
+ {},
+ };
+ MODULE_DEVICE_TABLE(of, vchiq_of_match);
+--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.h
++++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.h
+@@ -125,6 +125,7 @@ typedef struct vchiq_arm_state_struct {
+
+ struct vchiq_drvdata {
+ const unsigned int cache_line_size;
++ const bool use_36bit_addrs;
+ struct rpi_firmware *fw;
+ };
+
projects / openwrt / staging / chunkeey.git / blobdiff