linux-nvgpu/drivers/gpu/nvgpu/include/nvgpu/gops/mc.h

/*
 * Copyright (c) 2020-2021, NVIDIA CORPORATION.  All rights reserved.
 *
 * 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 AUTHORS OR COPYRIGHT HOLDERS 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.
 */
#ifndef NVGPU_GOPS_MC_H
#define NVGPU_GOPS_MC_H

#include <nvgpu/types.h>
#include <nvgpu/mc.h>
#include <nvgpu/engines.h>

/**
 * @file
 *
 * MC HAL interface.
 */
struct gk20a;
struct nvgpu_device;

/**
 * MC HAL operations.
 *
 * @see gpu_ops.
 */
struct gops_mc {
	/**
	 * @brief Get the GPU architecture, implementation and revision.
	 *
	 * @param g [in]	The GPU driver struct.
	 * @param arch [out]	GPU architecture level pointer. Can be
	 *			NULL if not needed by caller.
	 * @param impl [out]	GPU architecture pointer. Can be
	 *			NULL if not needed by caller.
	 * @param rev [out]	Chip revision pointer. Can be
	 *			NULL if not needed by the caller.
	 *
	 * This function is invoked to get the GPU architecture, implementation
	 * and revision level of the GPU chip before #nvgpu_finalize_poweron.
	 * These values are used for chip specific SW/HW handling in the
	 * driver.
	 *
	 * Steps:
	 * - Read the register mc_boot_0_r().
	 * - Architecture ID is placed in \arch
	 * - GPU implementation ID is placed in \a impl
	 * - Chip revision is placed in \a rev
	 *
	 * @return value of mc_boot_0_r().
	 */
	u32 (*get_chip_details)(struct gk20a *g,
				u32 *arch, u32 *impl, u32 *rev);

	/**
	 * @brief Read the stalling interrupts status register.
	 *
	 * @param g [in]	The GPU driver struct.
	 *
	 * This function is invoked to get stalling interrupts reported
	 * by the GPU before invoking the ISR.
	 *
	 * Steps:
	 * - Read and return the value of register
	 *   mc_intr_r(#NVGPU_CIC_INTR_STALLING).
	 *
	 * @return value read from mc_intr_r(#NVGPU_CIC_INTR_STALLING).
	 */
	u32 (*intr_stall)(struct gk20a *g);

	/**
	 * @brief Interrupt Service Routine (ISR) for handling the stalling
	 *        interrupts.
	 *
	 * @param g [in]	The GPU driver struct.
	 *
	 * This function is called by OS interrupt unit on receiving
	 * stalling interrupt for servicing it.
	 *
	 * Steps:
	 * - Read mc_intr_r(#NVGPU_CIC_INTR_STALLING) register to get the
	 *   stalling interrupts reported.
	 * - For the FIFO engines with pending interrupt invoke corresponding
	 *   handlers.
	 *   - Invoke g->ops.gr.intr.stall_isr if GR interrupt is pending.
	 *   - Invoke g->ops.ce.isr_stall if CE interrupt is pending.
	 * - For other units with pending interrupt invoke corresponding
	 *   handlers.
	 *   - Invoke g->ops.fb.intr.isr if HUB interrupt is pending, determined
	 *     by calling g->ops.mc.is_intr_hub_pending.
	 *   - Invoke g->ops.fifo.intr_0_isr if FIFO interrupt is pending. The
	 *     FIFO interrupt bit in mc_intr_r(#NVGPU_CIC_INTR_STALLING) is
	 *     mc_intr_pfifo_pending_f.
	 *   - Invoke g->ops.pmu.pmu_isr if PMU interrupt is pending.
	 *     The PMU interrupt bit in mc_intr_r(#NVGPU_CIC_INTR_STALLING)
	 *     is mc_intr_pmu_pending_f.
	 *   - Invoke g->ops.priv_ring.isr if PRIV_RING interrupt is pending.
	 *     The PRIV_RING interrupt bit in mc_intr_r(#NVGPU_CIC_INTR_STALLING)
	 *     is mc_intr_priv_ring_pending_f.
	 *   - Invoke g->ops.mc.ltc_isr if LTC interrupt is pending. The
	 *     LTC interrupt bit in mc_intr_r(#NVGPU_CIC_INTR_STALLING) is
	 *     mc_intr_ltc_pending_f.
	 *   - Invoke g->ops.bus.isr if BUS interrupt is pending. The
	 *     BUS interrupt bit in mc_intr_r(#NVGPU_CIC_INTR_STALLING) is
	 *     mc_intr_pbus_pending_f.
	 */
	void (*isr_stall)(struct gk20a *g);

	/**
	 * @brief Read the non-stalling interrupts status register.
	 *
	 * @param g [in]	The GPU driver struct.
	 *
	 * This function is invoked to get the non-stalling interrupts reported
	 * by the GPU before invoking the ISR.
	 *
	 * Steps:
	 * - Read and return the value of the register
	 *   mc_intr_r(#NVGPU_CIC_INTR_NONSTALLING).
	 *
	 * @return value read from mc_intr_r(#NVGPU_CIC_INTR_NONSTALLING).
	 */
	u32 (*intr_nonstall)(struct gk20a *g);

	/**
	 * @brief Interrupt Service Routine (ISR) for handling the non-stalling
	 *        interrupts.
	 *
	 * @param g [in]	The GPU driver struct.
	 *
	 * This function is called by OS interrupt unit on receiving
	 * non-stalling interrupt for servicing it.
	 *
	 * Steps:
	 * - Read mc_intr_r(#NVGPU_CIC_INTR_NONSTALLING) register to get the
	 *   non-stalling interrupts reported.
	 * - Invoke g->ops.fifo.intr_1_isr if FIFO non-stalling interrupt
	 *   is pending, determined by calling mc_intr_pfifo_pending_f.
	 * - For the FIFO engines with pending interrupt invoke corresponding
	 *   handlers.
	 *   - Invoke g->ops.gr.intr.nonstall_isr if GR interrupt is pending.
	 *   - Invoke g->ops.ce.isr_nonstall if CE interrupt is pending.
	 *
	 * @return bitmask of operations that are executed on non-stall
	 * workqueue.
	 */
	u32 (*isr_nonstall)(struct gk20a *g);

	/**
	 * @brief Check if stalling or engine interrupts are pending.
	 *
	 * @param g [in]			The GPU driver struct.
	 * @param engine_id [in]		Active engine id.
	 *					- Min: 0
	 *					- Max: NV_HOST_NUM_ENGINES
	 * @param eng_intr_pending [out]	Pointer to get pending
	 *					interrupt.
	 *
	 * This function is invoked while polling for preempt completion.
	 *
	 * Steps:
	 * - Read mc_intr_r(#NVGPU_CIC_INTR_STALLING) register to get
	 *   the interrupts reported.
	 * - Get the engine interrupt mask corresponding to \a engine_id.
	 * - Check if the bits for engine interrupt mask are set in the
	 *   mc_intr_r(#NVGPU_CIC_INTR_STALLING) register by AND'ing values
	 *   read in above two steps. Store the result in \a eng_intr_pending.
	 * - Initialize the stalling interrupt mask with bitmask for FIFO, HUB,
	 *   PRIV_RING, PBUS, LTC unit interrupts.
	 * - Return true if bits from above stalling interrupt mask or the
	 *   engine interrupt mask are set in the
	 *   mc_intr_r(#NVGPU_CIC_INTR_STALLING) register. Else, return false.
	 *
	 * @return true if stalling or engine interrupt is pending, else false.
	 */
	bool (*is_stall_and_eng_intr_pending)(struct gk20a *g,
				u32 engine_id, u32 *eng_intr_pending);

	/**
	 * @brief Interrupt Service Routine (ISR) for handling the Level Two
	 *        Cache (LTC) interrupts.
	 *
	 * @param g [in]	The GPU driver struct.
	 *
	 * This function is invoked to handle the LTC interrupts from
	 * #isr_stall.
	 *
	 * Steps:
	 * - Read mc_intr_ltc_r register to get the interrupts status for LTCs.
	 * - For each ltc from index 0 to nvgpu_ltc_get_ltc_count(\a g)
	 *   - If interrupt bitmask is set in the interrupts status register
	 *     - Invoke g->ops.ltc.intr.isr.
	 */
	void (*ltc_isr)(struct gk20a *g);

	/** @cond DOXYGEN_SHOULD_SKIP_THIS */

	void (*intr_mask)(struct gk20a *g);

	void (*intr_enable)(struct gk20a *g);

	void (*intr_stall_unit_config)(struct gk20a *g, u32 unit,
				bool enable);

	void (*intr_nonstall_unit_config)(struct gk20a *g, u32 unit,
				bool enable);

	void (*intr_stall_pause)(struct gk20a *g);

	void (*intr_stall_resume)(struct gk20a *g);

	void (*intr_nonstall_pause)(struct gk20a *g);

	void (*intr_nonstall_resume)(struct gk20a *g);

	int (*enable_units)(struct gk20a *g, u32 units, bool enable);

	int (*enable_dev)(struct gk20a *g, const struct nvgpu_device *dev,
			bool enable);

	int (*enable_devtype)(struct gk20a *g, u32 devtype, bool enable);

	void (*fbpa_isr)(struct gk20a *g);

#ifdef CONFIG_NVGPU_LS_PMU
	bool (*is_enabled)(struct gk20a *g, u32 unit);
#endif

	bool (*is_intr1_pending)(struct gk20a *g, u32 unit, u32 mc_intr_1);

	bool (*is_mmu_fault_pending)(struct gk20a *g);

	bool (*is_intr_hub_pending)(struct gk20a *g, u32 mc_intr);

#ifdef CONFIG_NVGPU_NON_FUSA
	void (*log_pending_intrs)(struct gk20a *g);
#endif

	void (*fb_reset)(struct gk20a *g);

#ifdef CONFIG_NVGPU_DGPU
	bool (*is_intr_nvlink_pending)(struct gk20a *g, u32 mc_intr);
#endif

	/**
	 * @brief Reset HW engines.
	 *
	 * @param g [in]		The GPU driver struct.
	 * @param devtype [in]		Type of device.
	 *
	 * This function is invoked to reset the engines while initializing
	 * GR, CE and other engines during #nvgpu_finalize_poweron.
	 *
	 * Steps:
	 * - Compute reset mask for all engines of given devtype.
	 * - Disable given HW engines.
	 *   - Acquire g->mc.enable_lock spinlock.
	 *   - Read mc_device_enable_r register and clear the bits in read value
	 *     corresponding to HW engines to be disabled.
	 *   - Write mc_device_enable_r with the updated value.
	 *   - Poll mc_device_enable_r to confirm register write success.
	 *   - Release g->mc.enable_lock spinlock.
	 * - If GR engines are being reset, reset GPCs.
	 * - Enable the HW engines.
	 *   - Acquire g->mc.enable_lock spinlock.
	 *   - Read mc_device_enable_r register and set the bits in read value
	 *     corresponding to HW engines to be enabled.
	 *   - Write mc_device_enable_r with the updated value.
	 *   - Poll mc_device_enable_r to confirm register write success.
	 *   - Release g->mc.enable_lock spinlock.
	 */
	int (*reset_engines_all)(struct gk20a *g, u32 devtype);
	void (*elpg_enable)(struct gk20a *g);
	bool (*intr_get_unit_info)(struct gk20a *g, u32 unit);

	/** @endcond DOXYGEN_SHOULD_SKIP_THIS */
};

#endif