diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_reg_access.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_reg_access.c | 644 |
1 files changed, 644 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_reg_access.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_reg_access.c new file mode 100644 index 000000000000..4b8888f82b64 --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_reg_access.c @@ -0,0 +1,644 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright 2025 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +#include <linux/delay.h> + +#include "amdgpu.h" +#include "amdgpu_reset.h" +#include "amdgpu_trace.h" +#include "amdgpu_virt.h" +#include "amdgpu_reg_access.h" + +#define AMDGPU_PCIE_INDEX_FALLBACK (0x38 >> 2) +#define AMDGPU_PCIE_INDEX_HI_FALLBACK (0x44 >> 2) +#define AMDGPU_PCIE_DATA_FALLBACK (0x3C >> 2) + +/* + * register access helper functions. + */ + +/** + * amdgpu_device_rreg - read a memory mapped IO or indirect register + * + * @adev: amdgpu_device pointer + * @reg: dword aligned register offset + * @acc_flags: access flags which require special behavior + * + * Returns the 32 bit value from the offset specified. + */ +uint32_t amdgpu_device_rreg(struct amdgpu_device *adev, uint32_t reg, + uint32_t acc_flags) +{ + uint32_t ret; + + if (amdgpu_device_skip_hw_access(adev)) + return 0; + + if ((reg * 4) < adev->rmmio_size) { + if (!(acc_flags & AMDGPU_REGS_NO_KIQ) && + amdgpu_sriov_runtime(adev) && + down_read_trylock(&adev->reset_domain->sem)) { + ret = amdgpu_kiq_rreg(adev, reg, 0); + up_read(&adev->reset_domain->sem); + } else { + ret = readl(((void __iomem *)adev->rmmio) + (reg * 4)); + } + } else { + ret = adev->pcie_rreg(adev, reg * 4); + } + + trace_amdgpu_device_rreg(adev->pdev->device, reg, ret); + + return ret; +} + +/* + * MMIO register read with bytes helper functions + * @offset:bytes offset from MMIO start + */ + +/** + * amdgpu_mm_rreg8 - read a memory mapped IO register + * + * @adev: amdgpu_device pointer + * @offset: byte aligned register offset + * + * Returns the 8 bit value from the offset specified. + */ +uint8_t amdgpu_mm_rreg8(struct amdgpu_device *adev, uint32_t offset) +{ + if (amdgpu_device_skip_hw_access(adev)) + return 0; + + if (offset < adev->rmmio_size) + return (readb(adev->rmmio + offset)); + BUG(); +} + +/** + * amdgpu_device_xcc_rreg - read a memory mapped IO or indirect register with specific XCC + * + * @adev: amdgpu_device pointer + * @reg: dword aligned register offset + * @acc_flags: access flags which require special behavior + * @xcc_id: xcc accelerated compute core id + * + * Returns the 32 bit value from the offset specified. + */ +uint32_t amdgpu_device_xcc_rreg(struct amdgpu_device *adev, uint32_t reg, + uint32_t acc_flags, uint32_t xcc_id) +{ + uint32_t ret, rlcg_flag; + + if (amdgpu_device_skip_hw_access(adev)) + return 0; + + if ((reg * 4) < adev->rmmio_size) { + if (amdgpu_sriov_vf(adev) && !amdgpu_sriov_runtime(adev) && + adev->gfx.rlc.rlcg_reg_access_supported && + amdgpu_virt_get_rlcg_reg_access_flag( + adev, acc_flags, GC_HWIP, false, &rlcg_flag)) { + ret = amdgpu_virt_rlcg_reg_rw(adev, reg, 0, rlcg_flag, + GET_INST(GC, xcc_id)); + } else if (!(acc_flags & AMDGPU_REGS_NO_KIQ) && + amdgpu_sriov_runtime(adev) && + down_read_trylock(&adev->reset_domain->sem)) { + ret = amdgpu_kiq_rreg(adev, reg, xcc_id); + up_read(&adev->reset_domain->sem); + } else { + ret = readl(((void __iomem *)adev->rmmio) + (reg * 4)); + } + } else { + ret = adev->pcie_rreg(adev, reg * 4); + } + + return ret; +} + +/* + * MMIO register write with bytes helper functions + * @offset:bytes offset from MMIO start + * @value: the value want to be written to the register + */ + +/** + * amdgpu_mm_wreg8 - read a memory mapped IO register + * + * @adev: amdgpu_device pointer + * @offset: byte aligned register offset + * @value: 8 bit value to write + * + * Writes the value specified to the offset specified. + */ +void amdgpu_mm_wreg8(struct amdgpu_device *adev, uint32_t offset, uint8_t value) +{ + if (amdgpu_device_skip_hw_access(adev)) + return; + + if (offset < adev->rmmio_size) + writeb(value, adev->rmmio + offset); + else + BUG(); +} + +/** + * amdgpu_device_wreg - write to a memory mapped IO or indirect register + * + * @adev: amdgpu_device pointer + * @reg: dword aligned register offset + * @v: 32 bit value to write to the register + * @acc_flags: access flags which require special behavior + * + * Writes the value specified to the offset specified. + */ +void amdgpu_device_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v, + uint32_t acc_flags) +{ + if (amdgpu_device_skip_hw_access(adev)) + return; + + if ((reg * 4) < adev->rmmio_size) { + if (!(acc_flags & AMDGPU_REGS_NO_KIQ) && + amdgpu_sriov_runtime(adev) && + down_read_trylock(&adev->reset_domain->sem)) { + amdgpu_kiq_wreg(adev, reg, v, 0); + up_read(&adev->reset_domain->sem); + } else { + writel(v, ((void __iomem *)adev->rmmio) + (reg * 4)); + } + } else { + adev->pcie_wreg(adev, reg * 4, v); + } + + trace_amdgpu_device_wreg(adev->pdev->device, reg, v); +} + +/** + * amdgpu_mm_wreg_mmio_rlc - write register either with direct/indirect mmio or with RLC path if in range + * + * @adev: amdgpu_device pointer + * @reg: mmio/rlc register + * @v: value to write + * @xcc_id: xcc accelerated compute core id + * + * this function is invoked only for the debugfs register access + */ +void amdgpu_mm_wreg_mmio_rlc(struct amdgpu_device *adev, uint32_t reg, + uint32_t v, uint32_t xcc_id) +{ + if (amdgpu_device_skip_hw_access(adev)) + return; + + if (amdgpu_sriov_fullaccess(adev) && adev->gfx.rlc.funcs && + adev->gfx.rlc.funcs->is_rlcg_access_range) { + if (adev->gfx.rlc.funcs->is_rlcg_access_range(adev, reg)) + return amdgpu_sriov_wreg(adev, reg, v, 0, 0, xcc_id); + } else if ((reg * 4) >= adev->rmmio_size) { + adev->pcie_wreg(adev, reg * 4, v); + } else { + writel(v, ((void __iomem *)adev->rmmio) + (reg * 4)); + } +} + +/** + * amdgpu_device_xcc_wreg - write to a memory mapped IO or indirect register with specific XCC + * + * @adev: amdgpu_device pointer + * @reg: dword aligned register offset + * @v: 32 bit value to write to the register + * @acc_flags: access flags which require special behavior + * @xcc_id: xcc accelerated compute core id + * + * Writes the value specified to the offset specified. + */ +void amdgpu_device_xcc_wreg(struct amdgpu_device *adev, uint32_t reg, + uint32_t v, uint32_t acc_flags, uint32_t xcc_id) +{ + uint32_t rlcg_flag; + + if (amdgpu_device_skip_hw_access(adev)) + return; + + if ((reg * 4) < adev->rmmio_size) { + if (amdgpu_sriov_vf(adev) && !amdgpu_sriov_runtime(adev) && + adev->gfx.rlc.rlcg_reg_access_supported && + amdgpu_virt_get_rlcg_reg_access_flag( + adev, acc_flags, GC_HWIP, true, &rlcg_flag)) { + amdgpu_virt_rlcg_reg_rw(adev, reg, v, rlcg_flag, + GET_INST(GC, xcc_id)); + } else if (!(acc_flags & AMDGPU_REGS_NO_KIQ) && + amdgpu_sriov_runtime(adev) && + down_read_trylock(&adev->reset_domain->sem)) { + amdgpu_kiq_wreg(adev, reg, v, xcc_id); + up_read(&adev->reset_domain->sem); + } else { + writel(v, ((void __iomem *)adev->rmmio) + (reg * 4)); + } + } else { + adev->pcie_wreg(adev, reg * 4, v); + } +} + +/** + * amdgpu_device_indirect_rreg - read an indirect register + * + * @adev: amdgpu_device pointer + * @reg_addr: indirect register address to read from + * + * Returns the value of indirect register @reg_addr + */ +u32 amdgpu_device_indirect_rreg(struct amdgpu_device *adev, u32 reg_addr) +{ + unsigned long flags, pcie_index, pcie_data; + void __iomem *pcie_index_offset; + void __iomem *pcie_data_offset; + u32 r; + + pcie_index = adev->nbio.funcs->get_pcie_index_offset(adev); + pcie_data = adev->nbio.funcs->get_pcie_data_offset(adev); + + spin_lock_irqsave(&adev->pcie_idx_lock, flags); + pcie_index_offset = (void __iomem *)adev->rmmio + pcie_index * 4; + pcie_data_offset = (void __iomem *)adev->rmmio + pcie_data * 4; + + writel(reg_addr, pcie_index_offset); + readl(pcie_index_offset); + r = readl(pcie_data_offset); + spin_unlock_irqrestore(&adev->pcie_idx_lock, flags); + + return r; +} + +u32 amdgpu_device_indirect_rreg_ext(struct amdgpu_device *adev, u64 reg_addr) +{ + unsigned long flags, pcie_index, pcie_index_hi, pcie_data; + u32 r; + void __iomem *pcie_index_offset; + void __iomem *pcie_index_hi_offset; + void __iomem *pcie_data_offset; + + if (unlikely(!adev->nbio.funcs)) { + pcie_index = AMDGPU_PCIE_INDEX_FALLBACK; + pcie_data = AMDGPU_PCIE_DATA_FALLBACK; + } else { + pcie_index = adev->nbio.funcs->get_pcie_index_offset(adev); + pcie_data = adev->nbio.funcs->get_pcie_data_offset(adev); + } + + if (reg_addr >> 32) { + if (unlikely(!adev->nbio.funcs)) + pcie_index_hi = AMDGPU_PCIE_INDEX_HI_FALLBACK; + else + pcie_index_hi = + adev->nbio.funcs->get_pcie_index_hi_offset( + adev); + } else { + pcie_index_hi = 0; + } + + spin_lock_irqsave(&adev->pcie_idx_lock, flags); + pcie_index_offset = (void __iomem *)adev->rmmio + pcie_index * 4; + pcie_data_offset = (void __iomem *)adev->rmmio + pcie_data * 4; + if (pcie_index_hi != 0) + pcie_index_hi_offset = + (void __iomem *)adev->rmmio + pcie_index_hi * 4; + + writel(reg_addr, pcie_index_offset); + readl(pcie_index_offset); + if (pcie_index_hi != 0) { + writel((reg_addr >> 32) & 0xff, pcie_index_hi_offset); + readl(pcie_index_hi_offset); + } + r = readl(pcie_data_offset); + + /* clear the high bits */ + if (pcie_index_hi != 0) { + writel(0, pcie_index_hi_offset); + readl(pcie_index_hi_offset); + } + + spin_unlock_irqrestore(&adev->pcie_idx_lock, flags); + + return r; +} + +/** + * amdgpu_device_indirect_rreg64 - read a 64bits indirect register + * + * @adev: amdgpu_device pointer + * @reg_addr: indirect register address to read from + * + * Returns the value of indirect register @reg_addr + */ +u64 amdgpu_device_indirect_rreg64(struct amdgpu_device *adev, u32 reg_addr) +{ + unsigned long flags, pcie_index, pcie_data; + void __iomem *pcie_index_offset; + void __iomem *pcie_data_offset; + u64 r; + + pcie_index = adev->nbio.funcs->get_pcie_index_offset(adev); + pcie_data = adev->nbio.funcs->get_pcie_data_offset(adev); + + spin_lock_irqsave(&adev->pcie_idx_lock, flags); + pcie_index_offset = (void __iomem *)adev->rmmio + pcie_index * 4; + pcie_data_offset = (void __iomem *)adev->rmmio + pcie_data * 4; + + /* read low 32 bits */ + writel(reg_addr, pcie_index_offset); + readl(pcie_index_offset); + r = readl(pcie_data_offset); + /* read high 32 bits */ + writel(reg_addr + 4, pcie_index_offset); + readl(pcie_index_offset); + r |= ((u64)readl(pcie_data_offset) << 32); + spin_unlock_irqrestore(&adev->pcie_idx_lock, flags); + + return r; +} + +u64 amdgpu_device_indirect_rreg64_ext(struct amdgpu_device *adev, u64 reg_addr) +{ + unsigned long flags, pcie_index, pcie_data; + unsigned long pcie_index_hi = 0; + void __iomem *pcie_index_offset; + void __iomem *pcie_index_hi_offset; + void __iomem *pcie_data_offset; + u64 r; + + pcie_index = adev->nbio.funcs->get_pcie_index_offset(adev); + pcie_data = adev->nbio.funcs->get_pcie_data_offset(adev); + if ((reg_addr >> 32) && (adev->nbio.funcs->get_pcie_index_hi_offset)) + pcie_index_hi = + adev->nbio.funcs->get_pcie_index_hi_offset(adev); + + spin_lock_irqsave(&adev->pcie_idx_lock, flags); + pcie_index_offset = (void __iomem *)adev->rmmio + pcie_index * 4; + pcie_data_offset = (void __iomem *)adev->rmmio + pcie_data * 4; + if (pcie_index_hi != 0) + pcie_index_hi_offset = + (void __iomem *)adev->rmmio + pcie_index_hi * 4; + + /* read low 32 bits */ + writel(reg_addr, pcie_index_offset); + readl(pcie_index_offset); + if (pcie_index_hi != 0) { + writel((reg_addr >> 32) & 0xff, pcie_index_hi_offset); + readl(pcie_index_hi_offset); + } + r = readl(pcie_data_offset); + /* read high 32 bits */ + writel(reg_addr + 4, pcie_index_offset); + readl(pcie_index_offset); + if (pcie_index_hi != 0) { + writel((reg_addr >> 32) & 0xff, pcie_index_hi_offset); + readl(pcie_index_hi_offset); + } + r |= ((u64)readl(pcie_data_offset) << 32); + + /* clear the high bits */ + if (pcie_index_hi != 0) { + writel(0, pcie_index_hi_offset); + readl(pcie_index_hi_offset); + } + + spin_unlock_irqrestore(&adev->pcie_idx_lock, flags); + + return r; +} + +/** + * amdgpu_device_indirect_wreg - write an indirect register address + * + * @adev: amdgpu_device pointer + * @reg_addr: indirect register offset + * @reg_data: indirect register data + * + */ +void amdgpu_device_indirect_wreg(struct amdgpu_device *adev, u32 reg_addr, + u32 reg_data) +{ + unsigned long flags, pcie_index, pcie_data; + void __iomem *pcie_index_offset; + void __iomem *pcie_data_offset; + + pcie_index = adev->nbio.funcs->get_pcie_index_offset(adev); + pcie_data = adev->nbio.funcs->get_pcie_data_offset(adev); + + spin_lock_irqsave(&adev->pcie_idx_lock, flags); + pcie_index_offset = (void __iomem *)adev->rmmio + pcie_index * 4; + pcie_data_offset = (void __iomem *)adev->rmmio + pcie_data * 4; + + writel(reg_addr, pcie_index_offset); + readl(pcie_index_offset); + writel(reg_data, pcie_data_offset); + readl(pcie_data_offset); + spin_unlock_irqrestore(&adev->pcie_idx_lock, flags); +} + +void amdgpu_device_indirect_wreg_ext(struct amdgpu_device *adev, u64 reg_addr, + u32 reg_data) +{ + unsigned long flags, pcie_index, pcie_index_hi, pcie_data; + void __iomem *pcie_index_offset; + void __iomem *pcie_index_hi_offset; + void __iomem *pcie_data_offset; + + pcie_index = adev->nbio.funcs->get_pcie_index_offset(adev); + pcie_data = adev->nbio.funcs->get_pcie_data_offset(adev); + if ((reg_addr >> 32) && (adev->nbio.funcs->get_pcie_index_hi_offset)) + pcie_index_hi = + adev->nbio.funcs->get_pcie_index_hi_offset(adev); + else + pcie_index_hi = 0; + + spin_lock_irqsave(&adev->pcie_idx_lock, flags); + pcie_index_offset = (void __iomem *)adev->rmmio + pcie_index * 4; + pcie_data_offset = (void __iomem *)adev->rmmio + pcie_data * 4; + if (pcie_index_hi != 0) + pcie_index_hi_offset = + (void __iomem *)adev->rmmio + pcie_index_hi * 4; + + writel(reg_addr, pcie_index_offset); + readl(pcie_index_offset); + if (pcie_index_hi != 0) { + writel((reg_addr >> 32) & 0xff, pcie_index_hi_offset); + readl(pcie_index_hi_offset); + } + writel(reg_data, pcie_data_offset); + readl(pcie_data_offset); + + /* clear the high bits */ + if (pcie_index_hi != 0) { + writel(0, pcie_index_hi_offset); + readl(pcie_index_hi_offset); + } + + spin_unlock_irqrestore(&adev->pcie_idx_lock, flags); +} + +/** + * amdgpu_device_indirect_wreg64 - write a 64bits indirect register address + * + * @adev: amdgpu_device pointer + * @reg_addr: indirect register offset + * @reg_data: indirect register data + * + */ +void amdgpu_device_indirect_wreg64(struct amdgpu_device *adev, u32 reg_addr, + u64 reg_data) +{ + unsigned long flags, pcie_index, pcie_data; + void __iomem *pcie_index_offset; + void __iomem *pcie_data_offset; + + pcie_index = adev->nbio.funcs->get_pcie_index_offset(adev); + pcie_data = adev->nbio.funcs->get_pcie_data_offset(adev); + + spin_lock_irqsave(&adev->pcie_idx_lock, flags); + pcie_index_offset = (void __iomem *)adev->rmmio + pcie_index * 4; + pcie_data_offset = (void __iomem *)adev->rmmio + pcie_data * 4; + + /* write low 32 bits */ + writel(reg_addr, pcie_index_offset); + readl(pcie_index_offset); + writel((u32)(reg_data & 0xffffffffULL), pcie_data_offset); + readl(pcie_data_offset); + /* write high 32 bits */ + writel(reg_addr + 4, pcie_index_offset); + readl(pcie_index_offset); + writel((u32)(reg_data >> 32), pcie_data_offset); + readl(pcie_data_offset); + spin_unlock_irqrestore(&adev->pcie_idx_lock, flags); +} + +void amdgpu_device_indirect_wreg64_ext(struct amdgpu_device *adev, u64 reg_addr, + u64 reg_data) +{ + unsigned long flags, pcie_index, pcie_data; + unsigned long pcie_index_hi = 0; + void __iomem *pcie_index_offset; + void __iomem *pcie_index_hi_offset; + void __iomem *pcie_data_offset; + + pcie_index = adev->nbio.funcs->get_pcie_index_offset(adev); + pcie_data = adev->nbio.funcs->get_pcie_data_offset(adev); + if ((reg_addr >> 32) && (adev->nbio.funcs->get_pcie_index_hi_offset)) + pcie_index_hi = + adev->nbio.funcs->get_pcie_index_hi_offset(adev); + + spin_lock_irqsave(&adev->pcie_idx_lock, flags); + pcie_index_offset = (void __iomem *)adev->rmmio + pcie_index * 4; + pcie_data_offset = (void __iomem *)adev->rmmio + pcie_data * 4; + if (pcie_index_hi != 0) + pcie_index_hi_offset = + (void __iomem *)adev->rmmio + pcie_index_hi * 4; + + /* write low 32 bits */ + writel(reg_addr, pcie_index_offset); + readl(pcie_index_offset); + if (pcie_index_hi != 0) { + writel((reg_addr >> 32) & 0xff, pcie_index_hi_offset); + readl(pcie_index_hi_offset); + } + writel((u32)(reg_data & 0xffffffffULL), pcie_data_offset); + readl(pcie_data_offset); + /* write high 32 bits */ + writel(reg_addr + 4, pcie_index_offset); + readl(pcie_index_offset); + if (pcie_index_hi != 0) { + writel((reg_addr >> 32) & 0xff, pcie_index_hi_offset); + readl(pcie_index_hi_offset); + } + writel((u32)(reg_data >> 32), pcie_data_offset); + readl(pcie_data_offset); + + /* clear the high bits */ + if (pcie_index_hi != 0) { + writel(0, pcie_index_hi_offset); + readl(pcie_index_hi_offset); + } + + spin_unlock_irqrestore(&adev->pcie_idx_lock, flags); +} + +u32 amdgpu_device_pcie_port_rreg(struct amdgpu_device *adev, u32 reg) +{ + unsigned long flags, address, data; + u32 r; + + address = adev->nbio.funcs->get_pcie_port_index_offset(adev); + data = adev->nbio.funcs->get_pcie_port_data_offset(adev); + + spin_lock_irqsave(&adev->pcie_idx_lock, flags); + WREG32(address, reg * 4); + (void)RREG32(address); + r = RREG32(data); + spin_unlock_irqrestore(&adev->pcie_idx_lock, flags); + return r; +} + +void amdgpu_device_pcie_port_wreg(struct amdgpu_device *adev, u32 reg, u32 v) +{ + unsigned long flags, address, data; + + address = adev->nbio.funcs->get_pcie_port_index_offset(adev); + data = adev->nbio.funcs->get_pcie_port_data_offset(adev); + + spin_lock_irqsave(&adev->pcie_idx_lock, flags); + WREG32(address, reg * 4); + (void)RREG32(address); + WREG32(data, v); + (void)RREG32(data); + spin_unlock_irqrestore(&adev->pcie_idx_lock, flags); +} + +uint32_t amdgpu_device_wait_on_rreg(struct amdgpu_device *adev, uint32_t inst, + uint32_t reg_addr, char reg_name[], + uint32_t expected_value, uint32_t mask) +{ + uint32_t ret = 0; + uint32_t old_ = 0; + uint32_t tmp_ = RREG32(reg_addr); + uint32_t loop = adev->usec_timeout; + + while ((tmp_ & (mask)) != (expected_value)) { + if (old_ != tmp_) { + loop = adev->usec_timeout; + old_ = tmp_; + } else + udelay(1); + tmp_ = RREG32(reg_addr); + loop--; + if (!loop) { + dev_warn( + adev->dev, + "Register(%d) [%s] failed to reach value 0x%08x != 0x%08xn", + inst, reg_name, (uint32_t)expected_value, + (uint32_t)(tmp_ & (mask))); + ret = -ETIMEDOUT; + break; + } + } + return ret; +} |