diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_device.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 439 |
1 files changed, 427 insertions, 12 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 690cf77b950e..beabb90e595a 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -89,6 +89,14 @@ static const char *amdgpu_asic_name[] = { static void amdgpu_device_get_pcie_info(struct amdgpu_device *adev); +/** + * amdgpu_device_is_px - Is the device is a dGPU with HG/PX power control + * + * @dev: drm_device pointer + * + * Returns true if the device is a dGPU with HG/PX power control, + * otherwise return false. + */ bool amdgpu_device_is_px(struct drm_device *dev) { struct amdgpu_device *adev = dev->dev_private; @@ -101,6 +109,15 @@ bool amdgpu_device_is_px(struct drm_device *dev) /* * MMIO register access helper functions. */ +/** + * amdgpu_mm_rreg - read a memory mapped IO 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_mm_rreg(struct amdgpu_device *adev, uint32_t reg, uint32_t acc_flags) { @@ -129,6 +146,14 @@ uint32_t amdgpu_mm_rreg(struct amdgpu_device *adev, uint32_t reg, * */ +/** + * 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 (offset < adev->rmmio_size) return (readb(adev->rmmio + offset)); @@ -141,6 +166,15 @@ uint8_t amdgpu_mm_rreg8(struct amdgpu_device *adev, uint32_t offset) { * @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 (offset < adev->rmmio_size) writeb(value, adev->rmmio + offset); @@ -148,7 +182,16 @@ void amdgpu_mm_wreg8(struct amdgpu_device *adev, uint32_t offset, uint8_t value) BUG(); } - +/** + * amdgpu_mm_wreg - write to a memory mapped IO 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_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v, uint32_t acc_flags) { @@ -177,6 +220,14 @@ void amdgpu_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v, } } +/** + * amdgpu_io_rreg - read an IO register + * + * @adev: amdgpu_device pointer + * @reg: dword aligned register offset + * + * Returns the 32 bit value from the offset specified. + */ u32 amdgpu_io_rreg(struct amdgpu_device *adev, u32 reg) { if ((reg * 4) < adev->rio_mem_size) @@ -187,6 +238,15 @@ u32 amdgpu_io_rreg(struct amdgpu_device *adev, u32 reg) } } +/** + * amdgpu_io_wreg - write to an IO register + * + * @adev: amdgpu_device pointer + * @reg: dword aligned register offset + * @v: 32 bit value to write to the register + * + * Writes the value specified to the offset specified. + */ void amdgpu_io_wreg(struct amdgpu_device *adev, u32 reg, u32 v) { if (adev->asic_type >= CHIP_VEGA10 && reg == 0) { @@ -355,6 +415,14 @@ static void amdgpu_block_invalid_wreg(struct amdgpu_device *adev, BUG(); } +/** + * amdgpu_device_vram_scratch_init - allocate the VRAM scratch page + * + * @adev: amdgpu device pointer + * + * Allocates a scratch page of VRAM for use by various things in the + * driver. + */ static int amdgpu_device_vram_scratch_init(struct amdgpu_device *adev) { return amdgpu_bo_create_kernel(adev, AMDGPU_GPU_PAGE_SIZE, @@ -364,6 +432,13 @@ static int amdgpu_device_vram_scratch_init(struct amdgpu_device *adev) (void **)&adev->vram_scratch.ptr); } +/** + * amdgpu_device_vram_scratch_fini - Free the VRAM scratch page + * + * @adev: amdgpu device pointer + * + * Frees the VRAM scratch page. + */ static void amdgpu_device_vram_scratch_fini(struct amdgpu_device *adev) { amdgpu_bo_free_kernel(&adev->vram_scratch.robj, NULL, NULL); @@ -405,6 +480,14 @@ void amdgpu_device_program_register_sequence(struct amdgpu_device *adev, } } +/** + * amdgpu_device_pci_config_reset - reset the GPU + * + * @adev: amdgpu_device pointer + * + * Resets the GPU using the pci config reset sequence. + * Only applicable to asics prior to vega10. + */ void amdgpu_device_pci_config_reset(struct amdgpu_device *adev) { pci_write_config_dword(adev->pdev, 0x7c, AMDGPU_ASIC_RESET_DATA); @@ -565,6 +648,7 @@ void amdgpu_device_wb_free(struct amdgpu_device *adev, u32 wb) /** * amdgpu_device_vram_location - try to find VRAM location + * * @adev: amdgpu device structure holding all necessary informations * @mc: memory controller structure holding memory informations * @base: base address at which to put VRAM @@ -588,6 +672,7 @@ void amdgpu_device_vram_location(struct amdgpu_device *adev, /** * amdgpu_device_gart_location - try to find GTT location + * * @adev: amdgpu device structure holding all necessary informations * @mc: memory controller structure holding memory informations * @@ -774,6 +859,16 @@ static unsigned int amdgpu_device_vga_set_decode(void *cookie, bool state) return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; } +/** + * amdgpu_device_check_block_size - validate the vm block size + * + * @adev: amdgpu_device pointer + * + * Validates the vm block size specified via module parameter. + * The vm block size defines number of bits in page table versus page directory, + * a page is 4KB so we have 12 bits offset, minimum 9 bits in the + * page table and the remaining bits are in the page directory. + */ static void amdgpu_device_check_block_size(struct amdgpu_device *adev) { /* defines number of bits in page table versus page directory, @@ -789,6 +884,14 @@ static void amdgpu_device_check_block_size(struct amdgpu_device *adev) } } +/** + * amdgpu_device_check_vm_size - validate the vm size + * + * @adev: amdgpu_device pointer + * + * Validates the vm size in GB specified via module parameter. + * The VM size is the size of the GPU virtual memory space in GB. + */ static void amdgpu_device_check_vm_size(struct amdgpu_device *adev) { /* no need to check the default value */ @@ -923,6 +1026,17 @@ static const struct vga_switcheroo_client_ops amdgpu_switcheroo_ops = { .can_switch = amdgpu_switcheroo_can_switch, }; +/** + * amdgpu_device_ip_set_clockgating_state - set the CG state + * + * @adev: amdgpu_device pointer + * @block_type: Type of hardware IP (SMU, GFX, UVD, etc.) + * @state: clockgating state (gate or ungate) + * + * Sets the requested clockgating state for all instances of + * the hardware IP specified. + * Returns the error code from the last instance. + */ int amdgpu_device_ip_set_clockgating_state(struct amdgpu_device *adev, enum amd_ip_block_type block_type, enum amd_clockgating_state state) @@ -945,6 +1059,17 @@ int amdgpu_device_ip_set_clockgating_state(struct amdgpu_device *adev, return r; } +/** + * amdgpu_device_ip_set_powergating_state - set the PG state + * + * @adev: amdgpu_device pointer + * @block_type: Type of hardware IP (SMU, GFX, UVD, etc.) + * @state: powergating state (gate or ungate) + * + * Sets the requested powergating state for all instances of + * the hardware IP specified. + * Returns the error code from the last instance. + */ int amdgpu_device_ip_set_powergating_state(struct amdgpu_device *adev, enum amd_ip_block_type block_type, enum amd_powergating_state state) @@ -967,6 +1092,17 @@ int amdgpu_device_ip_set_powergating_state(struct amdgpu_device *adev, return r; } +/** + * amdgpu_device_ip_get_clockgating_state - get the CG state + * + * @adev: amdgpu_device pointer + * @flags: clockgating feature flags + * + * Walks the list of IPs on the device and updates the clockgating + * flags for each IP. + * Updates @flags with the feature flags for each hardware IP where + * clockgating is enabled. + */ void amdgpu_device_ip_get_clockgating_state(struct amdgpu_device *adev, u32 *flags) { @@ -980,6 +1116,15 @@ void amdgpu_device_ip_get_clockgating_state(struct amdgpu_device *adev, } } +/** + * amdgpu_device_ip_wait_for_idle - wait for idle + * + * @adev: amdgpu_device pointer + * @block_type: Type of hardware IP (SMU, GFX, UVD, etc.) + * + * Waits for the request hardware IP to be idle. + * Returns 0 for success or a negative error code on failure. + */ int amdgpu_device_ip_wait_for_idle(struct amdgpu_device *adev, enum amd_ip_block_type block_type) { @@ -999,6 +1144,15 @@ int amdgpu_device_ip_wait_for_idle(struct amdgpu_device *adev, } +/** + * amdgpu_device_ip_is_idle - is the hardware IP idle + * + * @adev: amdgpu_device pointer + * @block_type: Type of hardware IP (SMU, GFX, UVD, etc.) + * + * Check if the hardware IP is idle or not. + * Returns true if it the IP is idle, false if not. + */ bool amdgpu_device_ip_is_idle(struct amdgpu_device *adev, enum amd_ip_block_type block_type) { @@ -1014,6 +1168,15 @@ bool amdgpu_device_ip_is_idle(struct amdgpu_device *adev, } +/** + * amdgpu_device_ip_get_ip_block - get a hw IP pointer + * + * @adev: amdgpu_device pointer + * @block_type: Type of hardware IP (SMU, GFX, UVD, etc.) + * + * Returns a pointer to the hardware IP block structure + * if it exists for the asic, otherwise NULL. + */ struct amdgpu_ip_block * amdgpu_device_ip_get_ip_block(struct amdgpu_device *adev, enum amd_ip_block_type type) @@ -1075,6 +1238,18 @@ int amdgpu_device_ip_block_add(struct amdgpu_device *adev, return 0; } +/** + * amdgpu_device_enable_virtual_display - enable virtual display feature + * + * @adev: amdgpu_device pointer + * + * Enabled the virtual display feature if the user has enabled it via + * the module parameter virtual_display. This feature provides a virtual + * display hardware on headless boards or in virtualized environments. + * This function parses and validates the configuration string specified by + * the user and configues the virtual display configuration (number of + * virtual connectors, crtcs, etc.) specified. + */ static void amdgpu_device_enable_virtual_display(struct amdgpu_device *adev) { adev->enable_virtual_display = false; @@ -1120,6 +1295,16 @@ static void amdgpu_device_enable_virtual_display(struct amdgpu_device *adev) } } +/** + * amdgpu_device_parse_gpu_info_fw - parse gpu info firmware + * + * @adev: amdgpu_device pointer + * + * Parses the asic configuration parameters specified in the gpu info + * firmware and makes them availale to the driver for use in configuring + * the asic. + * Returns 0 on success, -EINVAL on failure. + */ static int amdgpu_device_parse_gpu_info_fw(struct amdgpu_device *adev) { const char *chip_name; @@ -1218,6 +1403,16 @@ out: return err; } +/** + * amdgpu_device_ip_early_init - run early init for hardware IPs + * + * @adev: amdgpu_device pointer + * + * Early initialization pass for hardware IPs. The hardware IPs that make + * up each asic are discovered each IP's early_init callback is run. This + * is the first stage in initializing the asic. + * Returns 0 on success, negative error code on failure. + */ static int amdgpu_device_ip_early_init(struct amdgpu_device *adev) { int i, r; @@ -1327,6 +1522,17 @@ static int amdgpu_device_ip_early_init(struct amdgpu_device *adev) return 0; } +/** + * amdgpu_device_ip_init - run init for hardware IPs + * + * @adev: amdgpu_device pointer + * + * Main initialization pass for hardware IPs. The list of all the hardware + * IPs that make up the asic is walked and the sw_init and hw_init callbacks + * are run. sw_init initializes the software state associated with each IP + * and hw_init initializes the hardware associated with each IP. + * Returns 0 on success, negative error code on failure. + */ static int amdgpu_device_ip_init(struct amdgpu_device *adev) { int i, r; @@ -1394,17 +1600,47 @@ static int amdgpu_device_ip_init(struct amdgpu_device *adev) return 0; } +/** + * amdgpu_device_fill_reset_magic - writes reset magic to gart pointer + * + * @adev: amdgpu_device pointer + * + * Writes a reset magic value to the gart pointer in VRAM. The driver calls + * this function before a GPU reset. If the value is retained after a + * GPU reset, VRAM has not been lost. Some GPU resets may destry VRAM contents. + */ static void amdgpu_device_fill_reset_magic(struct amdgpu_device *adev) { memcpy(adev->reset_magic, adev->gart.ptr, AMDGPU_RESET_MAGIC_NUM); } +/** + * amdgpu_device_check_vram_lost - check if vram is valid + * + * @adev: amdgpu_device pointer + * + * Checks the reset magic value written to the gart pointer in VRAM. + * The driver calls this after a GPU reset to see if the contents of + * VRAM is lost or now. + * returns true if vram is lost, false if not. + */ static bool amdgpu_device_check_vram_lost(struct amdgpu_device *adev) { return !!memcmp(adev->gart.ptr, adev->reset_magic, AMDGPU_RESET_MAGIC_NUM); } +/** + * amdgpu_device_ip_late_set_cg_state - late init for clockgating + * + * @adev: amdgpu_device pointer + * + * Late initialization pass enabling clockgating for hardware IPs. + * The list of all the hardware IPs that make up the asic is walked and the + * set_clockgating_state callbacks are run. This stage is run late + * in the init process. + * Returns 0 on success, negative error code on failure. + */ static int amdgpu_device_ip_late_set_cg_state(struct amdgpu_device *adev) { int i = 0, r; @@ -1432,6 +1668,18 @@ static int amdgpu_device_ip_late_set_cg_state(struct amdgpu_device *adev) return 0; } +/** + * amdgpu_device_ip_late_init - run late init for hardware IPs + * + * @adev: amdgpu_device pointer + * + * Late initialization pass for hardware IPs. The list of all the hardware + * IPs that make up the asic is walked and the late_init callbacks are run. + * late_init covers any special initialization that an IP requires + * after all of the have been initialized or something that needs to happen + * late in the init process. + * Returns 0 on success, negative error code on failure. + */ static int amdgpu_device_ip_late_init(struct amdgpu_device *adev) { int i = 0, r; @@ -1458,6 +1706,17 @@ static int amdgpu_device_ip_late_init(struct amdgpu_device *adev) return 0; } +/** + * amdgpu_device_ip_fini - run fini for hardware IPs + * + * @adev: amdgpu_device pointer + * + * Main teardown pass for hardware IPs. The list of all the hardware + * IPs that make up the asic is walked and the hw_fini and sw_fini callbacks + * are run. hw_fini tears down the hardware associated with each IP + * and sw_fini tears down any software state associated with each IP. + * Returns 0 on success, negative error code on failure. + */ static int amdgpu_device_ip_fini(struct amdgpu_device *adev) { int i, r; @@ -1552,6 +1811,15 @@ static int amdgpu_device_ip_fini(struct amdgpu_device *adev) return 0; } +/** + * amdgpu_device_ip_late_init_func_handler - work handler for clockgating + * + * @work: work_struct + * + * Work handler for amdgpu_device_ip_late_set_cg_state. We put the + * clockgating setup into a worker thread to speed up driver init and + * resume from suspend. + */ static void amdgpu_device_ip_late_init_func_handler(struct work_struct *work) { struct amdgpu_device *adev = @@ -1559,6 +1827,17 @@ static void amdgpu_device_ip_late_init_func_handler(struct work_struct *work) amdgpu_device_ip_late_set_cg_state(adev); } +/** + * amdgpu_device_ip_suspend - run suspend for hardware IPs + * + * @adev: amdgpu_device pointer + * + * Main suspend function for hardware IPs. The list of all the hardware + * IPs that make up the asic is walked, clockgating is disabled and the + * suspend callbacks are run. suspend puts the hardware and software state + * in each IP into a state suitable for suspend. + * Returns 0 on success, negative error code on failure. + */ int amdgpu_device_ip_suspend(struct amdgpu_device *adev) { int i, r; @@ -1667,6 +1946,18 @@ static int amdgpu_device_ip_reinit_late_sriov(struct amdgpu_device *adev) return 0; } +/** + * amdgpu_device_ip_resume_phase1 - run resume for hardware IPs + * + * @adev: amdgpu_device pointer + * + * First resume function for hardware IPs. The list of all the hardware + * IPs that make up the asic is walked and the resume callbacks are run for + * COMMON, GMC, and IH. resume puts the hardware into a functional state + * after a suspend and updates the software state as necessary. This + * function is also used for restoring the GPU after a GPU reset. + * Returns 0 on success, negative error code on failure. + */ static int amdgpu_device_ip_resume_phase1(struct amdgpu_device *adev) { int i, r; @@ -1675,9 +1966,8 @@ static int amdgpu_device_ip_resume_phase1(struct amdgpu_device *adev) if (!adev->ip_blocks[i].status.valid) continue; if (adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_COMMON || - adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_GMC || - adev->ip_blocks[i].version->type == - AMD_IP_BLOCK_TYPE_IH) { + adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_GMC || + adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_IH) { r = adev->ip_blocks[i].version->funcs->resume(adev); if (r) { DRM_ERROR("resume of IP block <%s> failed %d\n", @@ -1690,6 +1980,19 @@ static int amdgpu_device_ip_resume_phase1(struct amdgpu_device *adev) return 0; } +/** + * amdgpu_device_ip_resume_phase2 - run resume for hardware IPs + * + * @adev: amdgpu_device pointer + * + * First resume function for hardware IPs. The list of all the hardware + * IPs that make up the asic is walked and the resume callbacks are run for + * all blocks except COMMON, GMC, and IH. resume puts the hardware into a + * functional state after a suspend and updates the software state as + * necessary. This function is also used for restoring the GPU after a GPU + * reset. + * Returns 0 on success, negative error code on failure. + */ static int amdgpu_device_ip_resume_phase2(struct amdgpu_device *adev) { int i, r; @@ -1698,8 +2001,8 @@ static int amdgpu_device_ip_resume_phase2(struct amdgpu_device *adev) if (!adev->ip_blocks[i].status.valid) continue; if (adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_COMMON || - adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_GMC || - adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_IH ) + adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_GMC || + adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_IH) continue; r = adev->ip_blocks[i].version->funcs->resume(adev); if (r) { @@ -1712,6 +2015,18 @@ static int amdgpu_device_ip_resume_phase2(struct amdgpu_device *adev) return 0; } +/** + * amdgpu_device_ip_resume - run resume for hardware IPs + * + * @adev: amdgpu_device pointer + * + * Main resume function for hardware IPs. The hardware IPs + * are split into two resume functions because they are + * are also used in in recovering from a GPU reset and some additional + * steps need to be take between them. In this case (S3/S4) they are + * run sequentially. + * Returns 0 on success, negative error code on failure. + */ static int amdgpu_device_ip_resume(struct amdgpu_device *adev) { int r; @@ -1724,6 +2039,13 @@ static int amdgpu_device_ip_resume(struct amdgpu_device *adev) return r; } +/** + * amdgpu_device_detect_sriov_bios - determine if the board supports SR-IOV + * + * @adev: amdgpu_device pointer + * + * Query the VBIOS data tables to determine if the board supports SR-IOV. + */ static void amdgpu_device_detect_sriov_bios(struct amdgpu_device *adev) { if (amdgpu_sriov_vf(adev)) { @@ -1740,6 +2062,14 @@ static void amdgpu_device_detect_sriov_bios(struct amdgpu_device *adev) } } +/** + * amdgpu_device_asic_has_dc_support - determine if DC supports the asic + * + * @asic_type: AMD asic type + * + * Check if there is DC (new modesetting infrastructre) support for an asic. + * returns true if DC has support, false if not. + */ bool amdgpu_device_asic_has_dc_support(enum amd_asic_type asic_type) { switch (asic_type) { @@ -2378,6 +2708,16 @@ unlock: return r; } +/** + * amdgpu_device_ip_check_soft_reset - did soft reset succeed + * + * @adev: amdgpu_device pointer + * + * The list of all the hardware IPs that make up the asic is walked and + * the check_soft_reset callbacks are run. check_soft_reset determines + * if the asic is still hung or not. + * Returns true if any of the IPs are still in a hung state, false if not. + */ static bool amdgpu_device_ip_check_soft_reset(struct amdgpu_device *adev) { int i; @@ -2400,6 +2740,17 @@ static bool amdgpu_device_ip_check_soft_reset(struct amdgpu_device *adev) return asic_hang; } +/** + * amdgpu_device_ip_pre_soft_reset - prepare for soft reset + * + * @adev: amdgpu_device pointer + * + * The list of all the hardware IPs that make up the asic is walked and the + * pre_soft_reset callbacks are run if the block is hung. pre_soft_reset + * handles any IP specific hardware or software state changes that are + * necessary for a soft reset to succeed. + * Returns 0 on success, negative error code on failure. + */ static int amdgpu_device_ip_pre_soft_reset(struct amdgpu_device *adev) { int i, r = 0; @@ -2418,6 +2769,15 @@ static int amdgpu_device_ip_pre_soft_reset(struct amdgpu_device *adev) return 0; } +/** + * amdgpu_device_ip_need_full_reset - check if a full asic reset is needed + * + * @adev: amdgpu_device pointer + * + * Some hardware IPs cannot be soft reset. If they are hung, a full gpu + * reset is necessary to recover. + * Returns true if a full asic reset is required, false if not. + */ static bool amdgpu_device_ip_need_full_reset(struct amdgpu_device *adev) { int i; @@ -2439,6 +2799,17 @@ static bool amdgpu_device_ip_need_full_reset(struct amdgpu_device *adev) return false; } +/** + * amdgpu_device_ip_soft_reset - do a soft reset + * + * @adev: amdgpu_device pointer + * + * The list of all the hardware IPs that make up the asic is walked and the + * soft_reset callbacks are run if the block is hung. soft_reset handles any + * IP specific hardware or software state changes that are necessary to soft + * reset the IP. + * Returns 0 on success, negative error code on failure. + */ static int amdgpu_device_ip_soft_reset(struct amdgpu_device *adev) { int i, r = 0; @@ -2457,6 +2828,17 @@ static int amdgpu_device_ip_soft_reset(struct amdgpu_device *adev) return 0; } +/** + * amdgpu_device_ip_post_soft_reset - clean up from soft reset + * + * @adev: amdgpu_device pointer + * + * The list of all the hardware IPs that make up the asic is walked and the + * post_soft_reset callbacks are run if the asic was hung. post_soft_reset + * handles any IP specific hardware or software state changes that are + * necessary after the IP has been soft reset. + * Returns 0 on success, negative error code on failure. + */ static int amdgpu_device_ip_post_soft_reset(struct amdgpu_device *adev) { int i, r = 0; @@ -2474,6 +2856,19 @@ static int amdgpu_device_ip_post_soft_reset(struct amdgpu_device *adev) return 0; } +/** + * amdgpu_device_recover_vram_from_shadow - restore shadowed VRAM buffers + * + * @adev: amdgpu_device pointer + * @ring: amdgpu_ring for the engine handling the buffer operations + * @bo: amdgpu_bo buffer whose shadow is being restored + * @fence: dma_fence associated with the operation + * + * Restores the VRAM buffer contents from the shadow in GTT. Used to + * restore things like GPUVM page tables after a GPU reset where + * the contents of VRAM might be lost. + * Returns 0 on success, negative error code on failure. + */ static int amdgpu_device_recover_vram_from_shadow(struct amdgpu_device *adev, struct amdgpu_ring *ring, struct amdgpu_bo *bo, @@ -2509,6 +2904,16 @@ err: return r; } +/** + * amdgpu_device_handle_vram_lost - Handle the loss of VRAM contents + * + * @adev: amdgpu_device pointer + * + * Restores the contents of VRAM buffers from the shadows in GTT. Used to + * restore things like GPUVM page tables after a GPU reset where + * the contents of VRAM might be lost. + * Returns 0 on success, 1 on failure. + */ static int amdgpu_device_handle_vram_lost(struct amdgpu_device *adev) { struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring; @@ -2562,17 +2967,17 @@ static int amdgpu_device_handle_vram_lost(struct amdgpu_device *adev) else DRM_ERROR("recover vram bo from shadow failed\n"); - return (r > 0?0:1); + return (r > 0) ? 0 : 1; } -/* +/** * amdgpu_device_reset - reset ASIC/GPU for bare-metal or passthrough * * @adev: amdgpu device pointer * * attempt to do soft-reset or full-reset and reinitialize Asic * return 0 means successed otherwise failed -*/ + */ static int amdgpu_device_reset(struct amdgpu_device *adev) { bool need_full_reset, vram_lost = 0; @@ -2642,15 +3047,16 @@ out: return r; } -/* +/** * amdgpu_device_reset_sriov - reset ASIC for SR-IOV vf * * @adev: amdgpu device pointer * * do VF FLR and reinitialize Asic * return 0 means successed otherwise failed -*/ -static int amdgpu_device_reset_sriov(struct amdgpu_device *adev, bool from_hypervisor) + */ +static int amdgpu_device_reset_sriov(struct amdgpu_device *adev, + bool from_hypervisor) { int r; @@ -2790,6 +3196,15 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev, return r; } +/** + * amdgpu_device_get_pcie_info - fence pcie info about the PCIE slot + * + * @adev: amdgpu_device pointer + * + * Fetchs and stores in the driver the PCIE capabilities (gen speed + * and lanes) of the slot the device is in. Handles APUs and + * virtualized environments where PCIE config space may not be available. + */ static void amdgpu_device_get_pcie_info(struct amdgpu_device *adev) { u32 mask; |