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From 2cba27bce0470a06237b3bd7883d43ade0d5c39c 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
@@ -16,6 +16,8 @@
#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"
@@ -63,6 +65,7 @@ static void __iomem *g_regs;
*/
static unsigned int g_cache_line_size = 32;
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;
@@ -106,6 +109,8 @@ 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);
@@ -117,14 +122,21 @@ 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;
@@ -158,7 +170,6 @@ 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) {
@@ -244,7 +255,7 @@ vchiq_prepare_bulk_data(struct vchiq_bul
if (!pagelistinfo)
return VCHIQ_ERROR;
- bulk->data = (void *)(unsigned long)pagelistinfo->dma_addr;
+ bulk->data = (void *)VC_SAFE(pagelistinfo->dma_addr);
/*
* Store the pagelistinfo address in remote_data,
@@ -522,25 +533,60 @@ 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
@@ -149,6 +149,11 @@ 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",
@@ -3164,6 +3169,7 @@ void vchiq_platform_conn_state_changed(s
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
@@ -97,6 +97,7 @@ struct vchiq_arm_state {
struct vchiq_drvdata {
const unsigned int cache_line_size;
+ const bool use_36bit_addrs;
struct rpi_firmware *fw;
};
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