intel_guc.h

/* SPDX-License-Identifier: MIT */
/*
 * Copyright © 2014-2019 Intel Corporation
 */

#ifndef _INTEL_GUC_H_
#define _INTEL_GUC_H_

#include <linux/xarray.h>
#include <linux/delay.h>

#include "intel_uncore.h"
#include "intel_guc_fw.h"
#include "intel_guc_fwif.h"
#include "intel_guc_ct.h"
#include "intel_guc_log.h"
#include "intel_guc_reg.h"
#include "intel_uc_fw.h"
#include "i915_utils.h"
#include "i915_vma.h"

struct __guc_ads_blob;

/*
 * Top level structure of GuC. It handles firmware loading and manages client
 * pool. intel_guc owns a intel_guc_client to replace the legacy ExecList
 * submission.
 */
struct intel_guc {
	struct intel_uc_fw fw;
	struct intel_guc_log log;
	struct intel_guc_ct ct;

	/* Global engine used to submit requests to GuC */
	struct i915_sched_engine *sched_engine;
	struct i915_request *stalled_request;

	/* intel_guc_recv interrupt related state */
	spinlock_t irq_lock;
	unsigned int msg_enabled_mask;

	struct {
		void (*reset)(struct intel_guc *guc);
		void (*enable)(struct intel_guc *guc);
		void (*disable)(struct intel_guc *guc);
	} interrupts;

	/*
	 * contexts_lock protects the pool of free guc ids and a linked list of
	 * guc ids available to be stolen
	 */
	spinlock_t contexts_lock;
	struct ida guc_ids;
	struct list_head guc_id_list;

	bool submission_selected;

	struct i915_vma *ads_vma;
	struct __guc_ads_blob *ads_blob;

	struct i915_vma *lrc_desc_pool;
	void *lrc_desc_pool_vaddr;

	/* guc_id to intel_context lookup */
	struct xarray context_lookup;

	/* Control params for fw initialization */
	u32 params[GUC_CTL_MAX_DWORDS];

	/* GuC's FW specific registers used in MMIO send */
	struct {
		u32 base;
		unsigned int count;
		enum forcewake_domains fw_domains;
	} send_regs;

	/* register used to send interrupts to the GuC FW */
	i915_reg_t notify_reg;

	/* Store msg (e.g. log flush) that we see while CTBs are disabled */
	u32 mmio_msg;

	/* To serialize the intel_guc_send actions */
	struct mutex send_mutex;
};

static inline struct intel_guc *log_to_guc(struct intel_guc_log *log)
{
	return container_of(log, struct intel_guc, log);
}

static
inline int intel_guc_send(struct intel_guc *guc, const u32 *action, u32 len)
{
	return intel_guc_ct_send(&guc->ct, action, len, NULL, 0, 0);
}

static
inline int intel_guc_send_nb(struct intel_guc *guc, const u32 *action, u32 len)
{
	return intel_guc_ct_send(&guc->ct, action, len, NULL, 0,
				 INTEL_GUC_CT_SEND_NB);
}

static inline int
intel_guc_send_and_receive(struct intel_guc *guc, const u32 *action, u32 len,
			   u32 *response_buf, u32 response_buf_size)
{
	return intel_guc_ct_send(&guc->ct, action, len,
				 response_buf, response_buf_size, 0);
}

static inline int intel_guc_send_busy_loop(struct intel_guc *guc,
					   const u32 *action,
					   u32 len,
					   bool loop)
{
	int err;
	unsigned int sleep_period_ms = 1;
	bool not_atomic = !in_atomic() && !irqs_disabled();

	/*
	 * FIXME: Have caller pass in if we are in an atomic context to avoid
	 * using in_atomic(). It is likely safe here as we check for irqs
	 * disabled which basically all the spin locks in the i915 do but
	 * regardless this should be cleaned up.
	 */

	/* No sleeping with spin locks, just busy loop */
	might_sleep_if(loop && not_atomic);

retry:
	err = intel_guc_send_nb(guc, action, len);
	if (unlikely(err == -EBUSY && loop)) {
		if (likely(not_atomic)) {
			if (msleep_interruptible(sleep_period_ms))
				return -EINTR;
			sleep_period_ms = sleep_period_ms << 1;
		} else {
			cpu_relax();
		}
		goto retry;
	}

	return err;
}

static inline void intel_guc_to_host_event_handler(struct intel_guc *guc)
{
	intel_guc_ct_event_handler(&guc->ct);
}

/* GuC addresses above GUC_GGTT_TOP also don't map through the GTT */
#define GUC_GGTT_TOP	0xFEE00000

/**
 * intel_guc_ggtt_offset() - Get and validate the GGTT offset of @vma
 * @guc: intel_guc structure.
 * @vma: i915 graphics virtual memory area.
 *
 * GuC does not allow any gfx GGTT address that falls into range
 * [0, ggtt.pin_bias), which is reserved for Boot ROM, SRAM and WOPCM.
 * Currently, in order to exclude [0, ggtt.pin_bias) address space from
 * GGTT, all gfx objects used by GuC are allocated with intel_guc_allocate_vma()
 * and pinned with PIN_OFFSET_BIAS along with the value of ggtt.pin_bias.
 *
 * Return: GGTT offset of the @vma.
 */
static inline u32 intel_guc_ggtt_offset(struct intel_guc *guc,
					struct i915_vma *vma)
{
	u32 offset = i915_ggtt_offset(vma);

	GEM_BUG_ON(offset < i915_ggtt_pin_bias(vma));
	GEM_BUG_ON(range_overflows_t(u64, offset, vma->size, GUC_GGTT_TOP));

	return offset;
}

void intel_guc_init_early(struct intel_guc *guc);
void intel_guc_init_send_regs(struct intel_guc *guc);
void intel_guc_write_params(struct intel_guc *guc);
int intel_guc_init(struct intel_guc *guc);
void intel_guc_fini(struct intel_guc *guc);
void intel_guc_notify(struct intel_guc *guc);
int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len,
			u32 *response_buf, u32 response_buf_size);
int intel_guc_to_host_process_recv_msg(struct intel_guc *guc,
				       const u32 *payload, u32 len);
int intel_guc_auth_huc(struct intel_guc *guc, u32 rsa_offset);
int intel_guc_suspend(struct intel_guc *guc);
int intel_guc_resume(struct intel_guc *guc);
struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size);
int intel_guc_allocate_and_map_vma(struct intel_guc *guc, u32 size,
				   struct i915_vma **out_vma, void **out_vaddr);

static inline bool intel_guc_is_supported(struct intel_guc *guc)
{
	return intel_uc_fw_is_supported(&guc->fw);
}

static inline bool intel_guc_is_wanted(struct intel_guc *guc)
{
	return intel_uc_fw_is_enabled(&guc->fw);
}

static inline bool intel_guc_is_used(struct intel_guc *guc)
{
	GEM_BUG_ON(__intel_uc_fw_status(&guc->fw) == INTEL_UC_FIRMWARE_SELECTED);
	return intel_uc_fw_is_available(&guc->fw);
}

static inline bool intel_guc_is_fw_running(struct intel_guc *guc)
{
	return intel_uc_fw_is_running(&guc->fw);
}

static inline bool intel_guc_is_ready(struct intel_guc *guc)
{
	return intel_guc_is_fw_running(guc) && intel_guc_ct_enabled(&guc->ct);
}

static inline int intel_guc_sanitize(struct intel_guc *guc)
{
	intel_uc_fw_sanitize(&guc->fw);
	intel_guc_ct_sanitize(&guc->ct);
	guc->mmio_msg = 0;

	return 0;
}

static inline void intel_guc_enable_msg(struct intel_guc *guc, u32 mask)
{
	spin_lock_irq(&guc->irq_lock);
	guc->msg_enabled_mask |= mask;
	spin_unlock_irq(&guc->irq_lock);
}

static inline void intel_guc_disable_msg(struct intel_guc *guc, u32 mask)
{
	spin_lock_irq(&guc->irq_lock);
	guc->msg_enabled_mask &= ~mask;
	spin_unlock_irq(&guc->irq_lock);
}

int intel_guc_reset_engine(struct intel_guc *guc,
			   struct intel_engine_cs *engine);

int intel_guc_deregister_done_process_msg(struct intel_guc *guc,
					  const u32 *msg, u32 len);

void intel_guc_load_status(struct intel_guc *guc, struct drm_printer *p);

#endif