diff options
Diffstat (limited to 'drivers/gpu/drm/lima/lima_mmu.c')
| -rw-r--r-- | drivers/gpu/drm/lima/lima_mmu.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/drivers/gpu/drm/lima/lima_mmu.c b/drivers/gpu/drm/lima/lima_mmu.c new file mode 100644 index 000000000000..8e1651d6a61f --- /dev/null +++ b/drivers/gpu/drm/lima/lima_mmu.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */ + +#include <linux/interrupt.h> +#include <linux/iopoll.h> +#include <linux/device.h> + +#include "lima_device.h" +#include "lima_mmu.h" +#include "lima_vm.h" +#include "lima_object.h" +#include "lima_regs.h" + +#define mmu_write(reg, data) writel(data, ip->iomem + reg) +#define mmu_read(reg) readl(ip->iomem + reg) + +#define lima_mmu_send_command(cmd, addr, val, cond) \ +({ \ + int __ret; \ + \ + mmu_write(LIMA_MMU_COMMAND, cmd); \ + __ret = readl_poll_timeout(ip->iomem + (addr), val, \ + cond, 0, 100); \ + if (__ret) \ + dev_err(dev->dev, \ + "mmu command %x timeout\n", cmd); \ + __ret; \ +}) + +static irqreturn_t lima_mmu_irq_handler(int irq, void *data) +{ + struct lima_ip *ip = data; + struct lima_device *dev = ip->dev; + u32 status = mmu_read(LIMA_MMU_INT_STATUS); + struct lima_sched_pipe *pipe; + + /* for shared irq case */ + if (!status) + return IRQ_NONE; + + if (status & LIMA_MMU_INT_PAGE_FAULT) { + u32 fault = mmu_read(LIMA_MMU_PAGE_FAULT_ADDR); + + dev_err(dev->dev, "mmu page fault at 0x%x from bus id %d of type %s on %s\n", + fault, LIMA_MMU_STATUS_BUS_ID(status), + status & LIMA_MMU_STATUS_PAGE_FAULT_IS_WRITE ? "write" : "read", + lima_ip_name(ip)); + } + + if (status & LIMA_MMU_INT_READ_BUS_ERROR) + dev_err(dev->dev, "mmu %s irq bus error\n", lima_ip_name(ip)); + + /* mask all interrupts before resume */ + mmu_write(LIMA_MMU_INT_MASK, 0); + mmu_write(LIMA_MMU_INT_CLEAR, status); + + pipe = dev->pipe + (ip->id == lima_ip_gpmmu ? lima_pipe_gp : lima_pipe_pp); + lima_sched_pipe_mmu_error(pipe); + + return IRQ_HANDLED; +} + +int lima_mmu_init(struct lima_ip *ip) +{ + struct lima_device *dev = ip->dev; + int err; + u32 v; + + if (ip->id == lima_ip_ppmmu_bcast) + return 0; + + mmu_write(LIMA_MMU_DTE_ADDR, 0xCAFEBABE); + if (mmu_read(LIMA_MMU_DTE_ADDR) != 0xCAFEB000) { + dev_err(dev->dev, "mmu %s dte write test fail\n", lima_ip_name(ip)); + return -EIO; + } + + mmu_write(LIMA_MMU_COMMAND, LIMA_MMU_COMMAND_HARD_RESET); + err = lima_mmu_send_command(LIMA_MMU_COMMAND_HARD_RESET, + LIMA_MMU_DTE_ADDR, v, v == 0); + if (err) + return err; + + err = devm_request_irq(dev->dev, ip->irq, lima_mmu_irq_handler, + IRQF_SHARED, lima_ip_name(ip), ip); + if (err) { + dev_err(dev->dev, "mmu %s fail to request irq\n", lima_ip_name(ip)); + return err; + } + + mmu_write(LIMA_MMU_INT_MASK, LIMA_MMU_INT_PAGE_FAULT | LIMA_MMU_INT_READ_BUS_ERROR); + mmu_write(LIMA_MMU_DTE_ADDR, dev->empty_vm->pd.dma); + return lima_mmu_send_command(LIMA_MMU_COMMAND_ENABLE_PAGING, + LIMA_MMU_STATUS, v, + v & LIMA_MMU_STATUS_PAGING_ENABLED); +} + +void lima_mmu_fini(struct lima_ip *ip) +{ + +} + +void lima_mmu_switch_vm(struct lima_ip *ip, struct lima_vm *vm) +{ + struct lima_device *dev = ip->dev; + u32 v; + + lima_mmu_send_command(LIMA_MMU_COMMAND_ENABLE_STALL, + LIMA_MMU_STATUS, v, + v & LIMA_MMU_STATUS_STALL_ACTIVE); + + if (vm) + mmu_write(LIMA_MMU_DTE_ADDR, vm->pd.dma); + + /* flush the TLB */ + mmu_write(LIMA_MMU_COMMAND, LIMA_MMU_COMMAND_ZAP_CACHE); + + lima_mmu_send_command(LIMA_MMU_COMMAND_DISABLE_STALL, + LIMA_MMU_STATUS, v, + !(v & LIMA_MMU_STATUS_STALL_ACTIVE)); +} + +void lima_mmu_page_fault_resume(struct lima_ip *ip) +{ + struct lima_device *dev = ip->dev; + u32 status = mmu_read(LIMA_MMU_STATUS); + u32 v; + + if (status & LIMA_MMU_STATUS_PAGE_FAULT_ACTIVE) { + dev_info(dev->dev, "mmu resume\n"); + + mmu_write(LIMA_MMU_INT_MASK, 0); + mmu_write(LIMA_MMU_DTE_ADDR, 0xCAFEBABE); + lima_mmu_send_command(LIMA_MMU_COMMAND_HARD_RESET, + LIMA_MMU_DTE_ADDR, v, v == 0); + mmu_write(LIMA_MMU_INT_MASK, LIMA_MMU_INT_PAGE_FAULT | LIMA_MMU_INT_READ_BUS_ERROR); + mmu_write(LIMA_MMU_DTE_ADDR, dev->empty_vm->pd.dma); + lima_mmu_send_command(LIMA_MMU_COMMAND_ENABLE_PAGING, + LIMA_MMU_STATUS, v, + v & LIMA_MMU_STATUS_PAGING_ENABLED); + } +} |