[PATCH] drm/amdgpu: add documentation for amdgpu_device.c
Alex Deucher
alexdeucher at gmail.com
Mon Mar 19 18:27:10 UTC 2018
On Fri, Mar 16, 2018 at 4:19 PM, Alex Deucher <alexdeucher at gmail.com> wrote:
> Add kernel doc for the functions in amdgpu_device.c
>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Ping?
Alex
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 439 ++++++++++++++++++++++++++++-
> 1 file 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 5bb88aa0a58e..06b6d70c4210 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 @@ static int amdgpu_device_parse_gpu_info_fw(struct amdgpu_device *adev)
> 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) {
> @@ -2379,6 +2709,16 @@ int amdgpu_device_resume(struct drm_device *dev, bool resume, bool fbcon)
> 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;
> @@ -2401,6 +2741,17 @@ 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;
> @@ -2419,6 +2770,15 @@ 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;
> @@ -2440,6 +2800,17 @@ 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;
> @@ -2458,6 +2829,17 @@ 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;
> @@ -2475,6 +2857,19 @@ 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,
> @@ -2510,6 +2905,16 @@ static int amdgpu_device_recover_vram_from_shadow(struct amdgpu_device *adev,
> 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;
> @@ -2563,17 +2968,17 @@ 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;
> @@ -2643,15 +3048,16 @@ static int amdgpu_device_reset(struct amdgpu_device *adev)
> 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;
>
> @@ -2791,6 +3197,15 @@ 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;
> --
> 2.13.6
>
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