diff options
| -rw-r--r-- | arch/arm/mach-apple/rtkit_helper.c | 50 |
1 files changed, 49 insertions, 1 deletions
diff --git a/arch/arm/mach-apple/rtkit_helper.c b/arch/arm/mach-apple/rtkit_helper.c index 3b755008195..b7d60e15700 100644 --- a/arch/arm/mach-apple/rtkit_helper.c +++ b/arch/arm/mach-apple/rtkit_helper.c @@ -16,12 +16,60 @@ #define REG_CPU_CTRL 0x0044 #define REG_CPU_CTRL_RUN BIT(4) +#define APPLE_RTKIT_EP_OSLOG 8 + struct rtkit_helper_priv { void *asc; /* ASC registers */ struct mbox_chan chan; struct apple_rtkit *rtk; + bool sram_stolen; }; +static int shmem_setup(void *cookie, struct apple_rtkit_buffer *buf) { + struct udevice *dev = cookie; + struct rtkit_helper_priv *priv = dev_get_priv(dev); + + if (!buf->is_mapped) { + /* + * Special case: The OSLog buffer on MTP persists on Linux handoff. + * Steal some SRAM instead of putting this in DRAM, so we don't + * have to hand off DART/DAPF mappings. + */ + if (buf->endpoint == APPLE_RTKIT_EP_OSLOG) { + if (priv->sram_stolen) { + printf("%s: Tried to map more than one OSLog buffer out of SRAM\n", + __func__); + } else { + fdt_size_t size; + fdt_addr_t addr; + + addr = dev_read_addr_size_name(dev, "sram", &size); + + if (addr != FDT_ADDR_T_NONE) { + buf->dva = ALIGN_DOWN(addr + size - buf->size, SZ_16K); + priv->sram_stolen = true; + + return 0; + } else { + printf("%s: No SRAM, falling back to DRAM\n", __func__); + } + } + } + + buf->buffer = memalign(SZ_16K, ALIGN(buf->size, SZ_16K)); + if (!buf->buffer) + return -ENOMEM; + + buf->dva = (u64)buf->buffer; + } + return 0; +} + +static void shmem_destroy(void *cookie, struct apple_rtkit_buffer *buf) { + if (buf->buffer) + free(buf->buffer); +} + static int rtkit_helper_probe(struct udevice *dev) { struct rtkit_helper_priv *priv = dev_get_priv(dev); @@ -39,7 +87,7 @@ static int rtkit_helper_probe(struct udevice *dev) ctrl = readl(priv->asc + REG_CPU_CTRL); writel(ctrl | REG_CPU_CTRL_RUN, priv->asc + REG_CPU_CTRL); - priv->rtk = apple_rtkit_init(&priv->chan, priv, NULL, NULL); + priv->rtk = apple_rtkit_init(&priv->chan, dev, shmem_setup, shmem_destroy); if (!priv->rtk) return -ENOMEM; |