/*
 * Copyright © 2013 Intel Corporation
 *
 * 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 (including the next
 * paragraph) 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.
 */

#include <linux/pm_runtime.h>
#include <asm/iosf_mbi.h>

#include "i915_drv.h"
#include "i915_vgpu.h"
#include "intel_drv.h"
#include "intel_pm.h"

#define FORCEWAKE_ACK_TIMEOUT_MS 50
#define GT_FIFO_TIMEOUT_MS       10

#define __raw_posting_read(...) ((void)__raw_uncore_read32(__VA_ARGS__))

static const char * const forcewake_domain_names[] = {
        "render",
        "blitter",
        "media",
        "vdbox0",
        "vdbox1",
        "vdbox2",
        "vdbox3",
        "vebox0",
        "vebox1",
};

const char *
intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id)
{
        BUILD_BUG_ON(ARRAY_SIZE(forcewake_domain_names) != FW_DOMAIN_ID_COUNT);

        if (id >= 0 && id < FW_DOMAIN_ID_COUNT)
                return forcewake_domain_names[id];

        WARN_ON(id);

        return "unknown";
}

#define fw_ack(d) readl((d)->reg_ack)
#define fw_set(d, val) writel(_MASKED_BIT_ENABLE((val)), (d)->reg_set)
#define fw_clear(d, val) writel(_MASKED_BIT_DISABLE((val)), (d)->reg_set)

static inline void
fw_domain_reset(const struct intel_uncore_forcewake_domain *d)
{
        /*
         * We don't really know if the powerwell for the forcewake domain we are
         * trying to reset here does exist at this point (engines could be fused
         * off in ICL+), so no waiting for acks
         */
        /* WaRsClearFWBitsAtReset:bdw,skl */
        fw_clear(d, 0xffff);
}

static inline void
fw_domain_arm_timer(struct intel_uncore_forcewake_domain *d)
{
        d->wake_count++;
        hrtimer_start_range_ns(&d->timer,
                               NSEC_PER_MSEC,
                               NSEC_PER_MSEC,
                               HRTIMER_MODE_REL);
}

static inline int
__wait_for_ack(const struct intel_uncore_forcewake_domain *d,
               const u32 ack,
               const u32 value)
{
        return wait_for_atomic((fw_ack(d) & ack) == value,
                               FORCEWAKE_ACK_TIMEOUT_MS);
}

static inline int
wait_ack_clear(const struct intel_uncore_forcewake_domain *d,
               const u32 ack)
{
        return __wait_for_ack(d, ack, 0);
}

static inline int
wait_ack_set(const struct intel_uncore_forcewake_domain *d,
             const u32 ack)
{
        return __wait_for_ack(d, ack, ack);
}

static inline void
fw_domain_wait_ack_clear(const struct intel_uncore_forcewake_domain *d)
{
        if (wait_ack_clear(d, FORCEWAKE_KERNEL)) {
                DRM_ERROR("%s: timed out waiting for forcewake ack to clear.\n",
                          intel_uncore_forcewake_domain_to_str(d->id));
                add_taint_for_CI(TAINT_WARN); /* CI now unreliable */
        }
}

enum ack_type {
        ACK_CLEAR = 0,
        ACK_SET
};

static int
fw_domain_wait_ack_with_fallback(const struct intel_uncore_forcewake_domain *d,
                                 const enum ack_type type)
{
        const u32 ack_bit = FORCEWAKE_KERNEL;
        const u32 value = type == ACK_SET ? ack_bit : 0;
        unsigned int pass;
        bool ack_detected;

        /*
         * There is a possibility of driver's wake request colliding
         * with hardware's own wake requests and that can cause
         * hardware to not deliver the driver's ack message.
         *
         * Use a fallback bit toggle to kick the gpu state machine
         * in the hope that the original ack will be delivered along with
         * the fallback ack.
         *
         * This workaround is described in HSDES #1604254524 and it's known as:
         * WaRsForcewakeAddDelayForAck:skl,bxt,kbl,glk,cfl,cnl,icl
         * although the name is a bit misleading.
         */

        pass = 1;
        do {
                wait_ack_clear(d, FORCEWAKE_KERNEL_FALLBACK);

                fw_set(d, FORCEWAKE_KERNEL_FALLBACK);
                /* Give gt some time to relax before the polling frenzy */
                udelay(10 * pass);
                wait_ack_set(d, FORCEWAKE_KERNEL_FALLBACK);

                ack_detected = (fw_ack(d) & ack_bit) == value;

                fw_clear(d, FORCEWAKE_KERNEL_FALLBACK);
        } while (!ack_detected && pass++ < 10);

        DRM_DEBUG_DRIVER("%s had to use fallback to %s ack, 0x%x (passes %u)\n",
                         intel_uncore_forcewake_domain_to_str(d->id),
                         type == ACK_SET ? "set" : "clear",
                         fw_ack(d),
                         pass);

        return ack_detected ? 0 : -ETIMEDOUT;
}

static inline void
fw_domain_wait_ack_clear_fallback(const struct intel_uncore_forcewake_domain *d)
{
        if (likely(!wait_ack_clear(d, FORCEWAKE_KERNEL)))
                return;

        if (fw_domain_wait_ack_with_fallback(d, ACK_CLEAR))
                fw_domain_wait_ack_clear(d);
}

static inline void
fw_domain_get(const struct intel_uncore_forcewake_domain *d)
{
        fw_set(d, FORCEWAKE_KERNEL);
}

static inline void
fw_domain_wait_ack_set(const struct intel_uncore_forcewake_domain *d)
{
        if (wait_ack_set(d, FORCEWAKE_KERNEL)) {
                DRM_ERROR("%s: timed out waiting for forcewake ack request.\n",
                          intel_uncore_forcewake_domain_to_str(d->id));
                add_taint_for_CI(TAINT_WARN); /* CI now unreliable */
        }
}

static inline void
fw_domain_wait_ack_set_fallback(const struct intel_uncore_forcewake_domain *d)
{
        if (likely(!wait_ack_set(d, FORCEWAKE_KERNEL)))
                return;

        if (fw_domain_wait_ack_with_fallback(d, ACK_SET))
                fw_domain_wait_ack_set(d);
}

static inline void
fw_domain_put(const struct intel_uncore_forcewake_domain *d)
{
        fw_clear(d, FORCEWAKE_KERNEL);
}

static void
fw_domains_get(struct intel_uncore *uncore, enum forcewake_domains fw_domains)
{
        struct intel_uncore_forcewake_domain *d;
        unsigned int tmp;

        GEM_BUG_ON(fw_domains & ~uncore->fw_domains);

        for_each_fw_domain_masked(d, fw_domains, uncore, tmp) {
                fw_domain_wait_ack_clear(d);
                fw_domain_get(d);
        }

        for_each_fw_domain_masked(d, fw_domains, uncore, tmp)
                fw_domain_wait_ack_set(d);

        uncore->fw_domains_active |= fw_domains;
}

static void
fw_domains_get_with_fallback(struct intel_uncore *uncore,
                             enum forcewake_domains fw_domains)
{
        struct intel_uncore_forcewake_domain *d;
        unsigned int tmp;

        GEM_BUG_ON(fw_domains & ~uncore->fw_domains);

        for_each_fw_domain_masked(d, fw_domains, uncore, tmp) {
                fw_domain_wait_ack_clear_fallback(d);
                fw_domain_get(d);
        }

        for_each_fw_domain_masked(d, fw_domains, uncore, tmp)
                fw_domain_wait_ack_set_fallback(d);

        uncore->fw_domains_active |= fw_domains;
}

static void
fw_domains_put(struct intel_uncore *uncore, enum forcewake_domains fw_domains)
{
        struct intel_uncore_forcewake_domain *d;
        unsigned int tmp;

        GEM_BUG_ON(fw_domains & ~uncore->fw_domains);

        for_each_fw_domain_masked(d, fw_domains, uncore, tmp)
                fw_domain_put(d);

        uncore->fw_domains_active &= ~fw_domains;
}

static void
fw_domains_reset(struct intel_uncore *uncore,
                 enum forcewake_domains fw_domains)
{
        struct intel_uncore_forcewake_domain *d;
        unsigned int tmp;

        if (!fw_domains)
                return;

        GEM_BUG_ON(fw_domains & ~uncore->fw_domains);

        for_each_fw_domain_masked(d, fw_domains, uncore, tmp)
                fw_domain_reset(d);
}

static inline u32 gt_thread_status(struct intel_uncore *uncore)
{
        u32 val;

        val = __raw_uncore_read32(uncore, GEN6_GT_THREAD_STATUS_REG);
        val &= GEN6_GT_THREAD_STATUS_CORE_MASK;

        return val;
}

static void __gen6_gt_wait_for_thread_c0(struct intel_uncore *uncore)
{
        /*
         * w/a for a sporadic read returning 0 by waiting for the GT
         * thread to wake up.
         */
        WARN_ONCE(wait_for_atomic_us(gt_thread_status(uncore) == 0, 5000),
                  "GT thread status wait timed out\n");
}

static void fw_domains_get_with_thread_status(struct intel_uncore *uncore,
                                              enum forcewake_domains fw_domains)
{
        fw_domains_get(uncore, fw_domains);

        /* WaRsForcewakeWaitTC0:snb,ivb,hsw,bdw,vlv */
        __gen6_gt_wait_for_thread_c0(uncore);
}

static inline u32 fifo_free_entries(struct intel_uncore *uncore)
{
        u32 count = __raw_uncore_read32(uncore, GTFIFOCTL);

        return count & GT_FIFO_FREE_ENTRIES_MASK;
}

static void __gen6_gt_wait_for_fifo(struct intel_uncore *uncore)
{
        u32 n;

        /* On VLV, FIFO will be shared by both SW and HW.
         * So, we need to read the FREE_ENTRIES everytime */
        if (IS_VALLEYVIEW(uncore_to_i915(uncore)))
                n = fifo_free_entries(uncore);
        else
                n = uncore->fifo_count;

        if (n <= GT_FIFO_NUM_RESERVED_ENTRIES) {
                if (wait_for_atomic((n = fifo_free_entries(uncore)) >
                                    GT_FIFO_NUM_RESERVED_ENTRIES,
                                    GT_FIFO_TIMEOUT_MS)) {
                        DRM_DEBUG("GT_FIFO timeout, entries: %u\n", n);
                        return;
                }
        }

        uncore->fifo_count = n - 1;
}

static enum hrtimer_restart
intel_uncore_fw_release_timer(struct hrtimer *timer)
{
        struct intel_uncore_forcewake_domain *domain =
               container_of(timer, struct intel_uncore_forcewake_domain, timer);
        struct intel_uncore *uncore = forcewake_domain_to_uncore(domain);
        unsigned long irqflags;

        assert_rpm_device_not_suspended(uncore->rpm);

        if (xchg(&domain->active, false))
                return HRTIMER_RESTART;

        spin_lock_irqsave(&uncore->lock, irqflags);
        if (WARN_ON(domain->wake_count == 0))
                domain->wake_count++;

        if (--domain->wake_count == 0)
                uncore->funcs.force_wake_put(uncore, domain->mask);

        spin_unlock_irqrestore(&uncore->lock, irqflags);

        return HRTIMER_NORESTART;
}

/* Note callers must have acquired the PUNIT->PMIC bus, before calling this. */
static unsigned int
intel_uncore_forcewake_reset(struct intel_uncore *uncore)
{
        unsigned long irqflags;
        struct intel_uncore_forcewake_domain *domain;
        int retry_count = 100;
        enum forcewake_domains fw, active_domains;

        iosf_mbi_assert_punit_acquired();

        /* Hold uncore.lock across reset to prevent any register access
         * with forcewake not set correctly. Wait until all pending
         * timers are run before holding.
         */
        while (1) {
                unsigned int tmp;

                active_domains = 0;

                for_each_fw_domain(domain, uncore, tmp) {
                        smp_store_mb(domain->active, false);
                        if (hrtimer_cancel(&domain->timer) == 0)
                                continue;

                        intel_uncore_fw_release_timer(&domain->timer);
                }

                spin_lock_irqsave(&uncore->lock, irqflags);

                for_each_fw_domain(domain, uncore, tmp) {
                        if (hrtimer_active(&domain->timer))
                                active_domains |= domain->mask;
                }

                if (active_domains == 0)
                        break;

                if (--retry_count == 0) {
                        DRM_ERROR("Timed out waiting for forcewake timers to finish\n");
                        break;
                }

                spin_unlock_irqrestore(&uncore->lock, irqflags);
                cond_resched();
        }

        WARN_ON(active_domains);

        fw = uncore->fw_domains_active;
        if (fw)
                uncore->funcs.force_wake_put(uncore, fw);

        fw_domains_reset(uncore, uncore->fw_domains);
        assert_forcewakes_inactive(uncore);

        spin_unlock_irqrestore(&uncore->lock, irqflags);

        return fw; /* track the lost user forcewake domains */
}

static bool
fpga_check_for_unclaimed_mmio(struct intel_uncore *uncore)
{
        u32 dbg;

        dbg = __raw_uncore_read32(uncore, FPGA_DBG);
        if (likely(!(dbg & FPGA_DBG_RM_NOCLAIM)))
                return false;

        __raw_uncore_write32(uncore, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);

        return true;
}

static bool
vlv_check_for_unclaimed_mmio(struct intel_uncore *uncore)
{
        u32 cer;

        cer = __raw_uncore_read32(uncore, CLAIM_ER);
        if (likely(!(cer & (CLAIM_ER_OVERFLOW | CLAIM_ER_CTR_MASK))))
                return false;

        __raw_uncore_write32(uncore, CLAIM_ER, CLAIM_ER_CLR);

        return true;
}

static bool
gen6_check_for_fifo_debug(struct intel_uncore *uncore)
{
        u32 fifodbg;

        fifodbg = __raw_uncore_read32(uncore, GTFIFODBG);

        if (unlikely(fifodbg)) {
                DRM_DEBUG_DRIVER("GTFIFODBG = 0x08%x\n", fifodbg);
                __raw_uncore_write32(uncore, GTFIFODBG, fifodbg);
        }

        return fifodbg;
}

static bool
check_for_unclaimed_mmio(struct intel_uncore *uncore)
{
        bool ret = false;

        if (intel_uncore_has_fpga_dbg_unclaimed(uncore))
                ret |= fpga_check_for_unclaimed_mmio(uncore);

        if (intel_uncore_has_dbg_unclaimed(uncore))
                ret |= vlv_check_for_unclaimed_mmio(uncore);

        if (intel_uncore_has_fifo(uncore))
                ret |= gen6_check_for_fifo_debug(uncore);

        return ret;
}

static void __intel_uncore_early_sanitize(struct intel_uncore *uncore,
                                          unsigned int restore_forcewake)
{
        /* clear out unclaimed reg detection bit */
        if (check_for_unclaimed_mmio(uncore))
                DRM_DEBUG("unclaimed mmio detected on uncore init, clearing\n");

        /* WaDisableShadowRegForCpd:chv */
        if (IS_CHERRYVIEW(uncore_to_i915(uncore))) {
                __raw_uncore_write32(uncore, GTFIFOCTL,
                                     __raw_uncore_read32(uncore, GTFIFOCTL) |
                                     GT_FIFO_CTL_BLOCK_ALL_POLICY_STALL |
                                     GT_FIFO_CTL_RC6_POLICY_STALL);
        }

        iosf_mbi_punit_acquire();
        intel_uncore_forcewake_reset(uncore);
        if (restore_forcewake) {
                spin_lock_irq(&uncore->lock);
                uncore->funcs.force_wake_get(uncore, restore_forcewake);

                if (intel_uncore_has_fifo(uncore))
                        uncore->fifo_count = fifo_free_entries(uncore);
                spin_unlock_irq(&uncore->lock);
        }
        iosf_mbi_punit_release();
}

void intel_uncore_suspend(struct intel_uncore *uncore)
{
        iosf_mbi_punit_acquire();
        iosf_mbi_unregister_pmic_bus_access_notifier_unlocked(
                &uncore->pmic_bus_access_nb);
        uncore->fw_domains_saved = intel_uncore_forcewake_reset(uncore);
        iosf_mbi_punit_release();
}

void intel_uncore_resume_early(struct intel_uncore *uncore)
{
        unsigned int restore_forcewake;

        restore_forcewake = fetch_and_zero(&uncore->fw_domains_saved);
        __intel_uncore_early_sanitize(uncore, restore_forcewake);

        iosf_mbi_register_pmic_bus_access_notifier(&uncore->pmic_bus_access_nb);
}

void intel_uncore_runtime_resume(struct intel_uncore *uncore)
{
        iosf_mbi_register_pmic_bus_access_notifier(&uncore->pmic_bus_access_nb);
}

void intel_uncore_sanitize(struct drm_i915_private *dev_priv)
{
        /* BIOS often leaves RC6 enabled, but disable it for hw init */
        intel_sanitize_gt_powersave(dev_priv);
}

static void __intel_uncore_forcewake_get(struct intel_uncore *uncore,
                                         enum forcewake_domains fw_domains)
{
        struct intel_uncore_forcewake_domain *domain;
        unsigned int tmp;

        fw_domains &= uncore->fw_domains;

        for_each_fw_domain_masked(domain, fw_domains, uncore, tmp) {
                if (domain->wake_count++) {
                        fw_domains &= ~domain->mask;
                        domain->active = true;
                }
        }

        if (fw_domains)
                uncore->funcs.force_wake_get(uncore, fw_domains);
}

/**
 * intel_uncore_forcewake_get - grab forcewake domain references
 * @uncore: the intel_uncore structure
 * @fw_domains: forcewake domains to get reference on
 *
 * This function can be used get GT's forcewake domain references.
 * Normal register access will handle the forcewake domains automatically.
 * However if some sequence requires the GT to not power down a particular
 * forcewake domains this function should be called at the beginning of the
 * sequence. And subsequently the reference should be dropped by symmetric
 * call to intel_unforce_forcewake_put(). Usually caller wants all the domains
 * to be kept awake so the @fw_domains would be then FORCEWAKE_ALL.
 */
void intel_uncore_forcewake_get(struct intel_uncore *uncore,
                                enum forcewake_domains fw_domains)
{
        unsigned long irqflags;

        if (!uncore->funcs.force_wake_get)
                return;

        assert_rpm_wakelock_held(uncore->rpm);

        spin_lock_irqsave(&uncore->lock, irqflags);
        __intel_uncore_forcewake_get(uncore, fw_domains);
        spin_unlock_irqrestore(&uncore->lock, irqflags);
}

/**
 * intel_uncore_forcewake_user_get - claim forcewake on behalf of userspace
 * @uncore: the intel_uncore structure
 *
 * This function is a wrapper around intel_uncore_forcewake_get() to acquire
 * the GT powerwell and in the process disable our debugging for the
 * duration of userspace's bypass.
 */
void intel_uncore_forcewake_user_get(struct intel_uncore *uncore)
{
        spin_lock_irq(&uncore->lock);
        if (!uncore->user_forcewake.count++) {
                intel_uncore_forcewake_get__locked(uncore, FORCEWAKE_ALL);

                /* Save and disable mmio debugging for the user bypass */
                uncore->user_forcewake.saved_mmio_check =
                        uncore->unclaimed_mmio_check;
                uncore->user_forcewake.saved_mmio_debug =
                        i915_modparams.mmio_debug;

                uncore->unclaimed_mmio_check = 0;
                i915_modparams.mmio_debug = 0;
        }
        spin_unlock_irq(&uncore->lock);
}

/**
 * intel_uncore_forcewake_user_put - release forcewake on behalf of userspace
 * @uncore: the intel_uncore structure
 *
 * This function complements intel_uncore_forcewake_user_get() and releases
 * the GT powerwell taken on behalf of the userspace bypass.
 */
void intel_uncore_forcewake_user_put(struct intel_uncore *uncore)
{
        spin_lock_irq(&uncore->lock);
        if (!--uncore->user_forcewake.count) {
                if (intel_uncore_unclaimed_mmio(uncore))
                        dev_info(uncore_to_i915(uncore)->drm.dev,
                                 "Invalid mmio detected during user access\n");

                uncore->unclaimed_mmio_check =
                        uncore->user_forcewake.saved_mmio_check;
                i915_modparams.mmio_debug =
                        uncore->user_forcewake.saved_mmio_debug;

                intel_uncore_forcewake_put__locked(uncore, FORCEWAKE_ALL);
        }
        spin_unlock_irq(&uncore->lock);
}

/**
 * intel_uncore_forcewake_get__locked - grab forcewake domain references
 * @uncore: the intel_uncore structure
 * @fw_domains: forcewake domains to get reference on
 *
 * See intel_uncore_forcewake_get(). This variant places the onus
 * on the caller to explicitly handle the dev_priv->uncore.lock spinlock.
 */
void intel_uncore_forcewake_get__locked(struct intel_uncore *uncore,
                                        enum forcewake_domains fw_domains)
{
        lockdep_assert_held(&uncore->lock);

        if (!uncore->funcs.force_wake_get)
                return;

        __intel_uncore_forcewake_get(uncore, fw_domains);
}

static void __intel_uncore_forcewake_put(struct intel_uncore *uncore,
                                         enum forcewake_domains fw_domains)
{
        struct intel_uncore_forcewake_domain *domain;
        unsigned int tmp;

        fw_domains &= uncore->fw_domains;

        for_each_fw_domain_masked(domain, fw_domains, uncore, tmp) {
                if (WARN_ON(domain->wake_count == 0))
                        continue;

                if (--domain->wake_count) {
                        domain->active = true;
                        continue;
                }

                fw_domain_arm_timer(domain);
        }
}

/**
 * intel_uncore_forcewake_put - release a forcewake domain reference
 * @uncore: the intel_uncore structure
 * @fw_domains: forcewake domains to put references
 *
 * This function drops the device-level forcewakes for specified
 * domains obtained by intel_uncore_forcewake_get().
 */
void intel_uncore_forcewake_put(struct intel_uncore *uncore,
                                enum forcewake_domains fw_domains)
{
        unsigned long irqflags;

        if (!uncore->funcs.force_wake_put)
                return;

        spin_lock_irqsave(&uncore->lock, irqflags);
        __intel_uncore_forcewake_put(uncore, fw_domains);
        spin_unlock_irqrestore(&uncore->lock, irqflags);
}

/**
 * intel_uncore_forcewake_put__locked - grab forcewake domain references
 * @uncore: the intel_uncore structure
 * @fw_domains: forcewake domains to get reference on
 *
 * See intel_uncore_forcewake_put(). This variant places the onus
 * on the caller to explicitly handle the dev_priv->uncore.lock spinlock.
 */
void intel_uncore_forcewake_put__locked(struct intel_uncore *uncore,
                                        enum forcewake_domains fw_domains)
{
        lockdep_assert_held(&uncore->lock);

        if (!uncore->funcs.force_wake_put)
                return;

        __intel_uncore_forcewake_put(uncore, fw_domains);
}

void assert_forcewakes_inactive(struct intel_uncore *uncore)
{
        if (!uncore->funcs.force_wake_get)
                return;

        WARN(uncore->fw_domains_active,
             "Expected all fw_domains to be inactive, but %08x are still on\n",
             uncore->fw_domains_active);
}

void assert_forcewakes_active(struct intel_uncore *uncore,
                              enum forcewake_domains fw_domains)
{
        if (!uncore->funcs.force_wake_get)
                return;

        assert_rpm_wakelock_held(uncore->rpm);

        fw_domains &= uncore->fw_domains;
        WARN(fw_domains & ~uncore->fw_domains_active,
             "Expected %08x fw_domains to be active, but %08x are off\n",
             fw_domains, fw_domains & ~uncore->fw_domains_active);
}

/* We give fast paths for the really cool registers */
#define NEEDS_FORCE_WAKE(reg) ((reg) < 0x40000)

#define GEN11_NEEDS_FORCE_WAKE(reg) \
        ((reg) < 0x40000 || ((reg) >= 0x1c0000 && (reg) < 0x1dc000))

#define __gen6_reg_read_fw_domains(uncore, offset) \
({ \
        enum forcewake_domains __fwd; \
        if (NEEDS_FORCE_WAKE(offset)) \
                __fwd = FORCEWAKE_RENDER; \
        else \
                __fwd = 0; \
        __fwd; \
})

static int fw_range_cmp(u32 offset, const struct intel_forcewake_range *entry)
{
        if (offset < entry->start)
                return -1;
        else if (offset > entry->end)
                return 1;
        else
                return 0;
}

/* Copied and "macroized" from lib/bsearch.c */
#define BSEARCH(key, base, num, cmp) ({                                 \
        unsigned int start__ = 0, end__ = (num);                        \
        typeof(base) result__ = NULL;                                   \
        while (start__ < end__) {                                       \
                unsigned int mid__ = start__ + (end__ - start__) / 2;   \
                int ret__ = (cmp)((key), (base) + mid__);               \
                if (ret__ < 0) {                                        \
                        end__ = mid__;                                  \
                } else if (ret__ > 0) {                                 \
                        start__ = mid__ + 1;                            \
                } else {                                                \
                        result__ = (base) + mid__;                      \
                        break;                                          \
                }                                                       \
        }                                                               \
        result__;                                                       \
})

static enum forcewake_domains
find_fw_domain(struct intel_uncore *uncore, u32 offset)
{
        const struct intel_forcewake_range *entry;

        entry = BSEARCH(offset,
                        uncore->fw_domains_table,
                        uncore->fw_domains_table_entries,
                        fw_range_cmp);

        if (!entry)
                return 0;

        /*
         * The list of FW domains depends on the SKU in gen11+ so we
         * can't determine it statically. We use FORCEWAKE_ALL and
         * translate it here to the list of available domains.
         */
        if (entry->domains == FORCEWAKE_ALL)
                return uncore->fw_domains;

        WARN(entry->domains & ~uncore->fw_domains,
             "Uninitialized forcewake domain(s) 0x%x accessed at 0x%x\n",
             entry->domains & ~uncore->fw_domains, offset);

        return entry->domains;
}

#define GEN_FW_RANGE(s, e, d) \
        { .start = (s), .end = (e), .domains = (d) }

#define HAS_FWTABLE(dev_priv) \
        (INTEL_GEN(dev_priv) >= 9 || \
         IS_CHERRYVIEW(dev_priv) || \
         IS_VALLEYVIEW(dev_priv))

/* *Must* be sorted by offset ranges! See intel_fw_table_check(). */
static const struct intel_forcewake_range __vlv_fw_ranges[] = {
        GEN_FW_RANGE(0x2000, 0x3fff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x5000, 0x7fff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0xb000, 0x11fff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x12000, 0x13fff, FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x22000, 0x23fff, FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x2e000, 0x2ffff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x30000, 0x3ffff, FORCEWAKE_MEDIA),
};

#define __fwtable_reg_read_fw_domains(uncore, offset) \
({ \
        enum forcewake_domains __fwd = 0; \
        if (NEEDS_FORCE_WAKE((offset))) \
                __fwd = find_fw_domain(uncore, offset); \
        __fwd; \
})

#define __gen11_fwtable_reg_read_fw_domains(uncore, offset) \
({ \
        enum forcewake_domains __fwd = 0; \
        if (GEN11_NEEDS_FORCE_WAKE((offset))) \
                __fwd = find_fw_domain(uncore, offset); \
        __fwd; \
})

/* *Must* be sorted by offset! See intel_shadow_table_check(). */
static const i915_reg_t gen8_shadowed_regs[] = {
        RING_TAIL(RENDER_RING_BASE),    /* 0x2000 (base) */
        GEN6_RPNSWREQ,                  /* 0xA008 */
        GEN6_RC_VIDEO_FREQ,             /* 0xA00C */
        RING_TAIL(GEN6_BSD_RING_BASE),  /* 0x12000 (base) */
        RING_TAIL(VEBOX_RING_BASE),     /* 0x1a000 (base) */
        RING_TAIL(BLT_RING_BASE),       /* 0x22000 (base) */
        /* TODO: Other registers are not yet used */
};

static const i915_reg_t gen11_shadowed_regs[] = {
        RING_TAIL(RENDER_RING_BASE),            /* 0x2000 (base) */
        GEN6_RPNSWREQ,                          /* 0xA008 */
        GEN6_RC_VIDEO_FREQ,                     /* 0xA00C */
        RING_TAIL(BLT_RING_BASE),               /* 0x22000 (base) */
        RING_TAIL(GEN11_BSD_RING_BASE),         /* 0x1C0000 (base) */
        RING_TAIL(GEN11_BSD2_RING_BASE),        /* 0x1C4000 (base) */
        RING_TAIL(GEN11_VEBOX_RING_BASE),       /* 0x1C8000 (base) */
        RING_TAIL(GEN11_BSD3_RING_BASE),        /* 0x1D0000 (base) */
        RING_TAIL(GEN11_BSD4_RING_BASE),        /* 0x1D4000 (base) */
        RING_TAIL(GEN11_VEBOX2_RING_BASE),      /* 0x1D8000 (base) */
        /* TODO: Other registers are not yet used */
};

static int mmio_reg_cmp(u32 key, const i915_reg_t *reg)
{
        u32 offset = i915_mmio_reg_offset(*reg);

        if (key < offset)
                return -1;
        else if (key > offset)
                return 1;
        else
                return 0;
}

#define __is_genX_shadowed(x) \
static bool is_gen##x##_shadowed(u32 offset) \
{ \
        const i915_reg_t *regs = gen##x##_shadowed_regs; \
        return BSEARCH(offset, regs, ARRAY_SIZE(gen##x##_shadowed_regs), \
                       mmio_reg_cmp); \
}

__is_genX_shadowed(8)
__is_genX_shadowed(11)

#define __gen8_reg_write_fw_domains(uncore, offset) \
({ \
        enum forcewake_domains __fwd; \
        if (NEEDS_FORCE_WAKE(offset) && !is_gen8_shadowed(offset)) \
                __fwd = FORCEWAKE_RENDER; \
        else \
                __fwd = 0; \
        __fwd; \
})

/* *Must* be sorted by offset ranges! See intel_fw_table_check(). */
static const struct intel_forcewake_range __chv_fw_ranges[] = {
        GEN_FW_RANGE(0x2000, 0x3fff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x4000, 0x4fff, FORCEWAKE_RENDER | FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x5200, 0x7fff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x8000, 0x82ff, FORCEWAKE_RENDER | FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x8300, 0x84ff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x8500, 0x85ff, FORCEWAKE_RENDER | FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x8800, 0x88ff, FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x9000, 0xafff, FORCEWAKE_RENDER | FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0xb000, 0xb47f, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0xd000, 0xd7ff, FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0xe000, 0xe7ff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0xf000, 0xffff, FORCEWAKE_RENDER | FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x12000, 0x13fff, FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x1a000, 0x1bfff, FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x1e800, 0x1e9ff, FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x30000, 0x37fff, FORCEWAKE_MEDIA),
};

#define __fwtable_reg_write_fw_domains(uncore, offset) \
({ \
        enum forcewake_domains __fwd = 0; \
        if (NEEDS_FORCE_WAKE((offset)) && !is_gen8_shadowed(offset)) \
                __fwd = find_fw_domain(uncore, offset); \
        __fwd; \
})

#define __gen11_fwtable_reg_write_fw_domains(uncore, offset) \
({ \
        enum forcewake_domains __fwd = 0; \
        if (GEN11_NEEDS_FORCE_WAKE((offset)) && !is_gen11_shadowed(offset)) \
                __fwd = find_fw_domain(uncore, offset); \
        __fwd; \
})

/* *Must* be sorted by offset ranges! See intel_fw_table_check(). */
static const struct intel_forcewake_range __gen9_fw_ranges[] = {
        GEN_FW_RANGE(0x0, 0xaff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0xb00, 0x1fff, 0), /* uncore range */
        GEN_FW_RANGE(0x2000, 0x26ff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x2700, 0x2fff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x3000, 0x3fff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x4000, 0x51ff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x5200, 0x7fff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x8000, 0x812f, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x8130, 0x813f, FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x8140, 0x815f, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x8160, 0x82ff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x8300, 0x84ff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x8500, 0x87ff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x8800, 0x89ff, FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x8a00, 0x8bff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x8c00, 0x8cff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x8d00, 0x93ff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x9400, 0x97ff, FORCEWAKE_RENDER | FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x9800, 0xafff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0xb000, 0xb47f, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0xb480, 0xcfff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0xd000, 0xd7ff, FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0xd800, 0xdfff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0xe000, 0xe8ff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0xe900, 0x11fff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x12000, 0x13fff, FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x14000, 0x19fff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x1a000, 0x1e9ff, FORCEWAKE_MEDIA),
        GEN_FW_RANGE(0x1ea00, 0x243ff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x24400, 0x247ff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x24800, 0x2ffff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x30000, 0x3ffff, FORCEWAKE_MEDIA),
};

/* *Must* be sorted by offset ranges! See intel_fw_table_check(). */
static const struct intel_forcewake_range __gen11_fw_ranges[] = {
        GEN_FW_RANGE(0x0, 0xaff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0xb00, 0x1fff, 0), /* uncore range */
        GEN_FW_RANGE(0x2000, 0x26ff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x2700, 0x2fff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x3000, 0x3fff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x4000, 0x51ff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x5200, 0x7fff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x8000, 0x813f, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x8140, 0x815f, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x8160, 0x82ff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x8300, 0x84ff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x8500, 0x8bff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x8c00, 0x8cff, FORCEWAKE_RENDER),

        GEN_FW_RANGE(0x8d00, 0x93ff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x9400, 0x97ff, FORCEWAKE_ALL),
        GEN_FW_RANGE(0x9800, 0xafff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0xb000, 0xb47f, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0xb480, 0xdfff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0xe000, 0xe8ff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0xe900, 0x243ff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x24400, 0x247ff, FORCEWAKE_RENDER),
        GEN_FW_RANGE(0x24800, 0x3ffff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x40000, 0x1bffff, 0),
        GEN_FW_RANGE(0x1c0000, 0x1c3fff, FORCEWAKE_MEDIA_VDBOX0),
        GEN_FW_RANGE(0x1c4000, 0x1c7fff, FORCEWAKE_MEDIA_VDBOX1),
        GEN_FW_RANGE(0x1c8000, 0x1cbfff, FORCEWAKE_MEDIA_VEBOX0),
        GEN_FW_RANGE(0x1cc000, 0x1cffff, FORCEWAKE_BLITTER),
        GEN_FW_RANGE(0x1d0000, 0x1d3fff, FORCEWAKE_MEDIA_VDBOX2),
        GEN_FW_RANGE(0x1d4000, 0x1d7fff, FORCEWAKE_MEDIA_VDBOX3),
        GEN_FW_RANGE(0x1d8000, 0x1dbfff, FORCEWAKE_MEDIA_VEBOX1)
};

static void
ilk_dummy_write(struct intel_uncore *uncore)
{
        /* WaIssueDummyWriteToWakeupFromRC6:ilk Issue a dummy write to wake up
         * the chip from rc6 before touching it for real. MI_MODE is masked,
         * hence harmless to write 0 into. */
        __raw_uncore_write32(uncore, MI_MODE, 0);
}

static void
__unclaimed_reg_debug(struct intel_uncore *uncore,
                      const i915_reg_t reg,
                      const bool read,
                      const bool before)
{
        if (WARN(check_for_unclaimed_mmio(uncore) && !before,
                 "Unclaimed %s register 0x%x\n",
                 read ? "read from" : "write to",
                 i915_mmio_reg_offset(reg)))
                /* Only report the first N failures */
                i915_modparams.mmio_debug--;
}

static inline void
unclaimed_reg_debug(struct intel_uncore *uncore,
                    const i915_reg_t reg,
                    const bool read,
                    const bool before)
{
        if (likely(!i915_modparams.mmio_debug))
                return;

        __unclaimed_reg_debug(uncore, reg, read, before);
}

#define GEN2_READ_HEADER(x) \
        u##x val = 0; \
        assert_rpm_wakelock_held(uncore->rpm);

#define GEN2_READ_FOOTER \
        trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
        return val

#define __gen2_read(x) \
static u##x \
gen2_read##x(struct intel_uncore *uncore, i915_reg_t reg, bool trace) { \
        GEN2_READ_HEADER(x); \
        val = __raw_uncore_read##x(uncore, reg); \
        GEN2_READ_FOOTER; \
}

#define __gen5_read(x) \
static u##x \
gen5_read##x(struct intel_uncore *uncore, i915_reg_t reg, bool trace) { \
        GEN2_READ_HEADER(x); \
        ilk_dummy_write(uncore); \
        val = __raw_uncore_read##x(uncore, reg); \
        GEN2_READ_FOOTER; \
}

__gen5_read(8)
__gen5_read(16)
__gen5_read(32)
__gen5_read(64)
__gen2_read(8)
__gen2_read(16)
__gen2_read(32)
__gen2_read(64)

#undef __gen5_read
#undef __gen2_read

#undef GEN2_READ_FOOTER
#undef GEN2_READ_HEADER

#define GEN6_READ_HEADER(x) \
        u32 offset = i915_mmio_reg_offset(reg); \
        unsigned long irqflags; \
        u##x val = 0; \
        assert_rpm_wakelock_held(uncore->rpm); \
        spin_lock_irqsave(&uncore->lock, irqflags); \
        unclaimed_reg_debug(uncore, reg, true, true)

#define GEN6_READ_FOOTER \
        unclaimed_reg_debug(uncore, reg, true, false); \
        spin_unlock_irqrestore(&uncore->lock, irqflags); \
        trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
        return val

static noinline void ___force_wake_auto(struct intel_uncore *uncore,
                                        enum forcewake_domains fw_domains)
{
        struct intel_uncore_forcewake_domain *domain;
        unsigned int tmp;

        GEM_BUG_ON(fw_domains & ~uncore->fw_domains);

        for_each_fw_domain_masked(domain, fw_domains, uncore, tmp)
                fw_domain_arm_timer(domain);

        uncore->funcs.force_wake_get(uncore, fw_domains);
}

static inline void __force_wake_auto(struct intel_uncore *uncore,
                                     enum forcewake_domains fw_domains)
{
        if (WARN_ON(!fw_domains))
                return;

        /* Turn on all requested but inactive supported forcewake domains. */
        fw_domains &= uncore->fw_domains;
        fw_domains &= ~uncore->fw_domains_active;

        if (fw_domains)
                ___force_wake_auto(uncore, fw_domains);
}

#define __gen_read(func, x) \
static u##x \
func##_read##x(struct intel_uncore *uncore, i915_reg_t reg, bool trace) { \
        enum forcewake_domains fw_engine; \
        GEN6_READ_HEADER(x); \
        fw_engine = __##func##_reg_read_fw_domains(uncore, offset); \
        if (fw_engine) \
                __force_wake_auto(uncore, fw_engine); \
        val = __raw_uncore_read##x(uncore, reg); \
        GEN6_READ_FOOTER; \
}
#define __gen6_read(x) __gen_read(gen6, x)
#define __fwtable_read(x) __gen_read(fwtable, x)
#define __gen11_fwtable_read(x) __gen_read(gen11_fwtable, x)

__gen11_fwtable_read(8)
__gen11_fwtable_read(16)
__gen11_fwtable_read(32)
__gen11_fwtable_read(64)
__fwtable_read(8)
__fwtable_read(16)
__fwtable_read(32)
__fwtable_read(64)
__gen6_read(8)
__gen6_read(16)
__gen6_read(32)
__gen6_read(64)

#undef __gen11_fwtable_read
#undef __fwtable_read
#undef __gen6_read
#undef GEN6_READ_FOOTER
#undef GEN6_READ_HEADER

#define GEN2_WRITE_HEADER \
        trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
        assert_rpm_wakelock_held(uncore->rpm); \

#define GEN2_WRITE_FOOTER

#define __gen2_write(x) \
static void \
gen2_write##x(struct intel_uncore *uncore, i915_reg_t reg, u##x val, bool trace) { \
        GEN2_WRITE_HEADER; \
        __raw_uncore_write##x(uncore, reg, val); \
        GEN2_WRITE_FOOTER; \
}

#define __gen5_write(x) \
static void \
gen5_write##x(struct intel_uncore *uncore, i915_reg_t reg, u##x val, bool trace) { \
        GEN2_WRITE_HEADER; \
        ilk_dummy_write(uncore); \
        __raw_uncore_write##x(uncore, reg, val); \
        GEN2_WRITE_FOOTER; \
}

__gen5_write(8)
__gen5_write(16)
__gen5_write(32)
__gen2_write(8)
__gen2_write(16)
__gen2_write(32)

#undef __gen5_write
#undef __gen2_write

#undef GEN2_WRITE_FOOTER
#undef GEN2_WRITE_HEADER

#define GEN6_WRITE_HEADER \
        u32 offset = i915_mmio_reg_offset(reg); \
        unsigned long irqflags; \
        trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
        assert_rpm_wakelock_held(uncore->rpm); \
        spin_lock_irqsave(&uncore->lock, irqflags); \
        unclaimed_reg_debug(uncore, reg, false, true)

#define GEN6_WRITE_FOOTER \
        unclaimed_reg_debug(uncore, reg, false, false); \
        spin_unlock_irqrestore(&uncore->lock, irqflags)

#define __gen6_write(x) \
static void \
gen6_write##x(struct intel_uncore *uncore, i915_reg_t reg, u##x val, bool trace) { \
        GEN6_WRITE_HEADER; \
        if (NEEDS_FORCE_WAKE(offset)) \
                __gen6_gt_wait_for_fifo(uncore); \
        __raw_uncore_write##x(uncore, reg, val); \
        GEN6_WRITE_FOOTER; \
}

#define __gen_write(func, x) \
static void \
func##_write##x(struct intel_uncore *uncore, i915_reg_t reg, u##x val, bool trace) { \
        enum forcewake_domains fw_engine; \
        GEN6_WRITE_HEADER; \
        fw_engine = __##func##_reg_write_fw_domains(uncore, offset); \
        if (fw_engine) \
                __force_wake_auto(uncore, fw_engine); \
        __raw_uncore_write##x(uncore, reg, val); \
        GEN6_WRITE_FOOTER; \
}
#define __gen8_write(x) __gen_write(gen8, x)
#define __fwtable_write(x) __gen_write(fwtable, x)
#define __gen11_fwtable_write(x) __gen_write(gen11_fwtable, x)

__gen11_fwtable_write(8)
__gen11_fwtable_write(16)
__gen11_fwtable_write(32)
__fwtable_write(8)
__fwtable_write(16)
__fwtable_write(32)
__gen8_write(8)
__gen8_write(16)
__gen8_write(32)
__gen6_write(8)
__gen6_write(16)
__gen6_write(32)

#undef __gen11_fwtable_write
#undef __fwtable_write
#undef __gen8_write
#undef __gen6_write
#undef GEN6_WRITE_FOOTER
#undef GEN6_WRITE_HEADER

#define ASSIGN_WRITE_MMIO_VFUNCS(uncore, x) \
do { \
        (uncore)->funcs.mmio_writeb = x##_write8; \
        (uncore)->funcs.mmio_writew = x##_write16; \
        (uncore)->funcs.mmio_writel = x##_write32; \
} while (0)

#define ASSIGN_READ_MMIO_VFUNCS(uncore, x) \
do { \
        (uncore)->funcs.mmio_readb = x##_read8; \
        (uncore)->funcs.mmio_readw = x##_read16; \
        (uncore)->funcs.mmio_readl = x##_read32; \
        (uncore)->funcs.mmio_readq = x##_read64; \
} while (0)


static void fw_domain_init(struct intel_uncore *uncore,
                           enum forcewake_domain_id domain_id,
                           i915_reg_t reg_set,
                           i915_reg_t reg_ack)
{
        struct intel_uncore_forcewake_domain *d;

        if (WARN_ON(domain_id >= FW_DOMAIN_ID_COUNT))
                return;

        d = &uncore->fw_domain[domain_id];

        WARN_ON(d->wake_count);

        WARN_ON(!i915_mmio_reg_valid(reg_set));
        WARN_ON(!i915_mmio_reg_valid(reg_ack));

        d->wake_count = 0;
        d->reg_set = uncore->regs + i915_mmio_reg_offset(reg_set);
        d->reg_ack = uncore->regs + i915_mmio_reg_offset(reg_ack);

        d->id = domain_id;

        BUILD_BUG_ON(FORCEWAKE_RENDER != (1 << FW_DOMAIN_ID_RENDER));
        BUILD_BUG_ON(FORCEWAKE_BLITTER != (1 << FW_DOMAIN_ID_BLITTER));
        BUILD_BUG_ON(FORCEWAKE_MEDIA != (1 << FW_DOMAIN_ID_MEDIA));
        BUILD_BUG_ON(FORCEWAKE_MEDIA_VDBOX0 != (1 << FW_DOMAIN_ID_MEDIA_VDBOX0));
        BUILD_BUG_ON(FORCEWAKE_MEDIA_VDBOX1 != (1 << FW_DOMAIN_ID_MEDIA_VDBOX1));
        BUILD_BUG_ON(FORCEWAKE_MEDIA_VDBOX2 != (1 << FW_DOMAIN_ID_MEDIA_VDBOX2));
        BUILD_BUG_ON(FORCEWAKE_MEDIA_VDBOX3 != (1 << FW_DOMAIN_ID_MEDIA_VDBOX3));
        BUILD_BUG_ON(FORCEWAKE_MEDIA_VEBOX0 != (1 << FW_DOMAIN_ID_MEDIA_VEBOX0));
        BUILD_BUG_ON(FORCEWAKE_MEDIA_VEBOX1 != (1 << FW_DOMAIN_ID_MEDIA_VEBOX1));


        d->mask = BIT(domain_id);

        hrtimer_init(&d->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
        d->timer.function = intel_uncore_fw_release_timer;

        uncore->fw_domains |= BIT(domain_id);

        fw_domain_reset(d);
}

static void fw_domain_fini(struct intel_uncore *uncore,
                           enum forcewake_domain_id domain_id)
{
        struct intel_uncore_forcewake_domain *d;

        if (WARN_ON(domain_id >= FW_DOMAIN_ID_COUNT))
                return;

        d = &uncore->fw_domain[domain_id];

        WARN_ON(d->wake_count);
        WARN_ON(hrtimer_cancel(&d->timer));
        memset(d, 0, sizeof(*d));

        uncore->fw_domains &= ~BIT(domain_id);
}

static void intel_uncore_fw_domains_init(struct intel_uncore *uncore)
{
        struct drm_i915_private *i915 = uncore_to_i915(uncore);

        if (!intel_uncore_has_forcewake(uncore))
                return;

        if (INTEL_GEN(i915) >= 11) {
                int i;

                uncore->funcs.force_wake_get =
                        fw_domains_get_with_fallback;
                uncore->funcs.force_wake_put = fw_domains_put;
                fw_domain_init(uncore, FW_DOMAIN_ID_RENDER,
                               FORCEWAKE_RENDER_GEN9,
                               FORCEWAKE_ACK_RENDER_GEN9);
                fw_domain_init(uncore, FW_DOMAIN_ID_BLITTER,
                               FORCEWAKE_BLITTER_GEN9,
                               FORCEWAKE_ACK_BLITTER_GEN9);
                for (i = 0; i < I915_MAX_VCS; i++) {
                        if (!HAS_ENGINE(i915, _VCS(i)))
                                continue;

                        fw_domain_init(uncore, FW_DOMAIN_ID_MEDIA_VDBOX0 + i,
                                       FORCEWAKE_MEDIA_VDBOX_GEN11(i),
                                       FORCEWAKE_ACK_MEDIA_VDBOX_GEN11(i));
                }
                for (i = 0; i < I915_MAX_VECS; i++) {
                        if (!HAS_ENGINE(i915, _VECS(i)))
                                continue;

                        fw_domain_init(uncore, FW_DOMAIN_ID_MEDIA_VEBOX0 + i,
                                       FORCEWAKE_MEDIA_VEBOX_GEN11(i),
                                       FORCEWAKE_ACK_MEDIA_VEBOX_GEN11(i));
                }
        } else if (IS_GEN_RANGE(i915, 9, 10)) {
                uncore->funcs.force_wake_get =
                        fw_domains_get_with_fallback;
                uncore->funcs.force_wake_put = fw_domains_put;
                fw_domain_init(uncore, FW_DOMAIN_ID_RENDER,
                               FORCEWAKE_RENDER_GEN9,
                               FORCEWAKE_ACK_RENDER_GEN9);
                fw_domain_init(uncore, FW_DOMAIN_ID_BLITTER,
                               FORCEWAKE_BLITTER_GEN9,
                               FORCEWAKE_ACK_BLITTER_GEN9);
                fw_domain_init(uncore, FW_DOMAIN_ID_MEDIA,
                               FORCEWAKE_MEDIA_GEN9, FORCEWAKE_ACK_MEDIA_GEN9);
        } else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
                uncore->funcs.force_wake_get = fw_domains_get;
                uncore->funcs.force_wake_put = fw_domains_put;
                fw_domain_init(uncore, FW_DOMAIN_ID_RENDER,
                               FORCEWAKE_VLV, FORCEWAKE_ACK_VLV);
                fw_domain_init(uncore, FW_DOMAIN_ID_MEDIA,
                               FORCEWAKE_MEDIA_VLV, FORCEWAKE_ACK_MEDIA_VLV);
        } else if (IS_HASWELL(i915) || IS_BROADWELL(i915)) {
                uncore->funcs.force_wake_get =
                        fw_domains_get_with_thread_status;
                uncore->funcs.force_wake_put = fw_domains_put;
                fw_domain_init(uncore, FW_DOMAIN_ID_RENDER,
                               FORCEWAKE_MT, FORCEWAKE_ACK_HSW);
        } else if (IS_IVYBRIDGE(i915)) {
                u32 ecobus;

                /* IVB configs may use multi-threaded forcewake */

                /* A small trick here - if the bios hasn't configured
                 * MT forcewake, and if the device is in RC6, then
                 * force_wake_mt_get will not wake the device and the
                 * ECOBUS read will return zero. Which will be
                 * (correctly) interpreted by the test below as MT
                 * forcewake being disabled.
                 */
                uncore->funcs.force_wake_get =
                        fw_domains_get_with_thread_status;
                uncore->funcs.force_wake_put = fw_domains_put;

                /* We need to init first for ECOBUS access and then
                 * determine later if we want to reinit, in case of MT access is
                 * not working. In this stage we don't know which flavour this
                 * ivb is, so it is better to reset also the gen6 fw registers
                 * before the ecobus check.
                 */

                __raw_uncore_write32(uncore, FORCEWAKE, 0);
                __raw_posting_read(uncore, ECOBUS);

                fw_domain_init(uncore, FW_DOMAIN_ID_RENDER,
                               FORCEWAKE_MT, FORCEWAKE_MT_ACK);

                spin_lock_irq(&uncore->lock);
                fw_domains_get_with_thread_status(uncore, FORCEWAKE_RENDER);
                ecobus = __raw_uncore_read32(uncore, ECOBUS);
                fw_domains_put(uncore, FORCEWAKE_RENDER);
                spin_unlock_irq(&uncore->lock);

                if (!(ecobus & FORCEWAKE_MT_ENABLE)) {
                        DRM_INFO("No MT forcewake available on Ivybridge, this can result in issues\n");
                        DRM_INFO("when using vblank-synced partial screen updates.\n");
                        fw_domain_init(uncore, FW_DOMAIN_ID_RENDER,
                                       FORCEWAKE, FORCEWAKE_ACK);
                }
        } else if (IS_GEN(i915, 6)) {
                uncore->funcs.force_wake_get =
                        fw_domains_get_with_thread_status;
                uncore->funcs.force_wake_put = fw_domains_put;
                fw_domain_init(uncore, FW_DOMAIN_ID_RENDER,
                               FORCEWAKE, FORCEWAKE_ACK);
        }

        /* All future platforms are expected to require complex power gating */
        WARN_ON(uncore->fw_domains == 0);
}

#define ASSIGN_FW_DOMAINS_TABLE(uncore, d) \
{ \
        (uncore)->fw_domains_table = \
                        (struct intel_forcewake_range *)(d); \
        (uncore)->fw_domains_table_entries = ARRAY_SIZE((d)); \
}

static int i915_pmic_bus_access_notifier(struct notifier_block *nb,
                                         unsigned long action, void *data)
{
        struct intel_uncore *uncore = container_of(nb,
                        struct intel_uncore, pmic_bus_access_nb);

        switch (action) {
        case MBI_PMIC_BUS_ACCESS_BEGIN:
                /*
                 * forcewake all now to make sure that we don't need to do a
                 * forcewake later which on systems where this notifier gets
                 * called requires the punit to access to the shared pmic i2c
                 * bus, which will be busy after this notification, leading to:
                 * "render: timed out waiting for forcewake ack request."
                 * errors.
                 *
                 * The notifier is unregistered during intel_runtime_suspend(),
                 * so it's ok to access the HW here without holding a RPM
                 * wake reference -> disable wakeref asserts for the time of
                 * the access.
                 */
                disable_rpm_wakeref_asserts(uncore->rpm);
                intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
                enable_rpm_wakeref_asserts(uncore->rpm);
                break;
        case MBI_PMIC_BUS_ACCESS_END:
                intel_uncore_forcewake_put(uncore, FORCEWAKE_ALL);
                break;
        }

        return NOTIFY_OK;
}

static int uncore_mmio_setup(struct intel_uncore *uncore)
{
        struct drm_i915_private *i915 = uncore_to_i915(uncore);
        struct pci_dev *pdev = i915->drm.pdev;
        int mmio_bar;
        int mmio_size;

        mmio_bar = IS_GEN(i915, 2) ? 1 : 0;
        /*
         * Before gen4, the registers and the GTT are behind different BARs.
         * However, from gen4 onwards, the registers and the GTT are shared
         * in the same BAR, so we want to restrict this ioremap from
         * clobbering the GTT which we want ioremap_wc instead. Fortunately,
         * the register BAR remains the same size for all the earlier
         * generations up to Ironlake.
         */
        if (INTEL_GEN(i915) < 5)
                mmio_size = 512 * 1024;
        else
                mmio_size = 2 * 1024 * 1024;
        uncore->regs = pci_iomap(pdev, mmio_bar, mmio_size);
        if (uncore->regs == NULL) {
                DRM_ERROR("failed to map registers\n");

                return -EIO;
        }

        return 0;
}

static void uncore_mmio_cleanup(struct intel_uncore *uncore)
{
        struct drm_i915_private *i915 = uncore_to_i915(uncore);
        struct pci_dev *pdev = i915->drm.pdev;

        pci_iounmap(pdev, uncore->regs);
}

void intel_uncore_init_early(struct intel_uncore *uncore)
{
        spin_lock_init(&uncore->lock);
}

int intel_uncore_init_mmio(struct intel_uncore *uncore)
{
        struct drm_i915_private *i915 = uncore_to_i915(uncore);
        int ret;

        ret = uncore_mmio_setup(uncore);
        if (ret)
                return ret;

        i915_check_vgpu(i915);

        if (INTEL_GEN(i915) > 5 && !intel_vgpu_active(i915))
                uncore->flags |= UNCORE_HAS_FORCEWAKE;

        intel_uncore_fw_domains_init(uncore);
        __intel_uncore_early_sanitize(uncore, 0);

        uncore->unclaimed_mmio_check = 1;
        uncore->pmic_bus_access_nb.notifier_call =
                i915_pmic_bus_access_notifier;

        uncore->rpm = &i915->runtime_pm;

        if (!intel_uncore_has_forcewake(uncore)) {
                if (IS_GEN(i915, 5)) {
                        ASSIGN_WRITE_MMIO_VFUNCS(uncore, gen5);
                        ASSIGN_READ_MMIO_VFUNCS(uncore, gen5);
                } else {
                        ASSIGN_WRITE_MMIO_VFUNCS(uncore, gen2);
                        ASSIGN_READ_MMIO_VFUNCS(uncore, gen2);
                }
        } else if (IS_GEN_RANGE(i915, 6, 7)) {
                ASSIGN_WRITE_MMIO_VFUNCS(uncore, gen6);

                if (IS_VALLEYVIEW(i915)) {
                        ASSIGN_FW_DOMAINS_TABLE(uncore, __vlv_fw_ranges);
                        ASSIGN_READ_MMIO_VFUNCS(uncore, fwtable);
                } else {
                        ASSIGN_READ_MMIO_VFUNCS(uncore, gen6);
                }
        } else if (IS_GEN(i915, 8)) {
                if (IS_CHERRYVIEW(i915)) {
                        ASSIGN_FW_DOMAINS_TABLE(uncore, __chv_fw_ranges);
                        ASSIGN_WRITE_MMIO_VFUNCS(uncore, fwtable);
                        ASSIGN_READ_MMIO_VFUNCS(uncore, fwtable);

                } else {
                        ASSIGN_WRITE_MMIO_VFUNCS(uncore, gen8);
                        ASSIGN_READ_MMIO_VFUNCS(uncore, gen6);
                }
        } else if (IS_GEN_RANGE(i915, 9, 10)) {
                ASSIGN_FW_DOMAINS_TABLE(uncore, __gen9_fw_ranges);
                ASSIGN_WRITE_MMIO_VFUNCS(uncore, fwtable);
                ASSIGN_READ_MMIO_VFUNCS(uncore, fwtable);
        } else {
                ASSIGN_FW_DOMAINS_TABLE(uncore, __gen11_fw_ranges);
                ASSIGN_WRITE_MMIO_VFUNCS(uncore, gen11_fwtable);
                ASSIGN_READ_MMIO_VFUNCS(uncore, gen11_fwtable);
        }

        if (HAS_FPGA_DBG_UNCLAIMED(i915))
                uncore->flags |= UNCORE_HAS_FPGA_DBG_UNCLAIMED;

        if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
                uncore->flags |= UNCORE_HAS_DBG_UNCLAIMED;

        if (IS_GEN_RANGE(i915, 6, 7))
                uncore->flags |= UNCORE_HAS_FIFO;

        iosf_mbi_register_pmic_bus_access_notifier(&uncore->pmic_bus_access_nb);

        return 0;
}

/*
 * We might have detected that some engines are fused off after we initialized
 * the forcewake domains. Prune them, to make sure they only reference existing
 * engines.
 */
void intel_uncore_prune_mmio_domains(struct intel_uncore *uncore)
{
        struct drm_i915_private *i915 = uncore_to_i915(uncore);

        if (INTEL_GEN(i915) >= 11) {
                enum forcewake_domains fw_domains = uncore->fw_domains;
                enum forcewake_domain_id domain_id;
                int i;

                for (i = 0; i < I915_MAX_VCS; i++) {
                        domain_id = FW_DOMAIN_ID_MEDIA_VDBOX0 + i;

                        if (HAS_ENGINE(i915, _VCS(i)))
                                continue;

                        if (fw_domains & BIT(domain_id))
                                fw_domain_fini(uncore, domain_id);
                }

                for (i = 0; i < I915_MAX_VECS; i++) {
                        domain_id = FW_DOMAIN_ID_MEDIA_VEBOX0 + i;

                        if (HAS_ENGINE(i915, _VECS(i)))
                                continue;

                        if (fw_domains & BIT(domain_id))
                                fw_domain_fini(uncore, domain_id);
                }
        }
}

void intel_uncore_fini_mmio(struct intel_uncore *uncore)
{
        /* Paranoia: make sure we have disabled everything before we exit. */
        intel_uncore_sanitize(uncore_to_i915(uncore));

        iosf_mbi_punit_acquire();
        iosf_mbi_unregister_pmic_bus_access_notifier_unlocked(
                &uncore->pmic_bus_access_nb);
        intel_uncore_forcewake_reset(uncore);
        iosf_mbi_punit_release();
        uncore_mmio_cleanup(uncore);
}

static const struct reg_whitelist {
        i915_reg_t offset_ldw;
        i915_reg_t offset_udw;
        u16 gen_mask;
        u8 size;
} reg_read_whitelist[] = { {
        .offset_ldw = RING_TIMESTAMP(RENDER_RING_BASE),
        .offset_udw = RING_TIMESTAMP_UDW(RENDER_RING_BASE),
        .gen_mask = INTEL_GEN_MASK(4, 11),
        .size = 8
} };

int i915_reg_read_ioctl(struct drm_device *dev,
                        void *data, struct drm_file *file)
{
        struct drm_i915_private *i915 = to_i915(dev);
        struct intel_uncore *uncore = &i915->uncore;
        struct drm_i915_reg_read *reg = data;
        struct reg_whitelist const *entry;
        intel_wakeref_t wakeref;
        unsigned int flags;
        int remain;
        int ret = 0;

        entry = reg_read_whitelist;
        remain = ARRAY_SIZE(reg_read_whitelist);
        while (remain) {
                u32 entry_offset = i915_mmio_reg_offset(entry->offset_ldw);

                GEM_BUG_ON(!is_power_of_2(entry->size));
                GEM_BUG_ON(entry->size > 8);
                GEM_BUG_ON(entry_offset & (entry->size - 1));

                if (INTEL_INFO(i915)->gen_mask & entry->gen_mask &&
                    entry_offset == (reg->offset & -entry->size))
                        break;
                entry++;
                remain--;
        }

        if (!remain)
                return -EINVAL;

        flags = reg->offset & (entry->size - 1);

        with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
                if (entry->size == 8 && flags == I915_REG_READ_8B_WA)
                        reg->val = intel_uncore_read64_2x32(uncore,
                                                            entry->offset_ldw,
                                                            entry->offset_udw);
                else if (entry->size == 8 && flags == 0)
                        reg->val = intel_uncore_read64(uncore,
                                                       entry->offset_ldw);
                else if (entry->size == 4 && flags == 0)
                        reg->val = intel_uncore_read(uncore, entry->offset_ldw);
                else if (entry->size == 2 && flags == 0)
                        reg->val = intel_uncore_read16(uncore,
                                                       entry->offset_ldw);
                else if (entry->size == 1 && flags == 0)
                        reg->val = intel_uncore_read8(uncore,
                                                      entry->offset_ldw);
                else
                        ret = -EINVAL;
        }

        return ret;
}

/**
 * __intel_wait_for_register_fw - wait until register matches expected state
 * @uncore: the struct intel_uncore
 * @reg: the register to read
 * @mask: mask to apply to register value
 * @value: expected value
 * @fast_timeout_us: fast timeout in microsecond for atomic/tight wait
 * @slow_timeout_ms: slow timeout in millisecond
 * @out_value: optional placeholder to hold registry value
 *
 * This routine waits until the target register @reg contains the expected
 * @value after applying the @mask, i.e. it waits until ::
 *
 *     (I915_READ_FW(reg) & mask) == value
 *
 * Otherwise, the wait will timeout after @slow_timeout_ms milliseconds.
 * For atomic context @slow_timeout_ms must be zero and @fast_timeout_us
 * must be not larger than 20,0000 microseconds.
 *
 * Note that this routine assumes the caller holds forcewake asserted, it is
 * not suitable for very long waits. See intel_wait_for_register() if you
 * wish to wait without holding forcewake for the duration (i.e. you expect
 * the wait to be slow).
 *
 * Returns 0 if the register matches the desired condition, or -ETIMEOUT.
 */
int __intel_wait_for_register_fw(struct intel_uncore *uncore,
                                 i915_reg_t reg,
                                 u32 mask,
                                 u32 value,
                                 unsigned int fast_timeout_us,
                                 unsigned int slow_timeout_ms,
                                 u32 *out_value)
{
        u32 uninitialized_var(reg_value);
#define done (((reg_value = intel_uncore_read_fw(uncore, reg)) & mask) == value)
        int ret;

        /* Catch any overuse of this function */
        might_sleep_if(slow_timeout_ms);
        GEM_BUG_ON(fast_timeout_us > 20000);

        ret = -ETIMEDOUT;
        if (fast_timeout_us && fast_timeout_us <= 20000)
                ret = _wait_for_atomic(done, fast_timeout_us, 0);
        if (ret && slow_timeout_ms)
                ret = wait_for(done, slow_timeout_ms);

        if (out_value)
                *out_value = reg_value;

        return ret;
#undef done
}

/**
 * __intel_wait_for_register - wait until register matches expected state
 * @uncore: the struct intel_uncore
 * @reg: the register to read
 * @mask: mask to apply to register value
 * @value: expected value
 * @fast_timeout_us: fast timeout in microsecond for atomic/tight wait
 * @slow_timeout_ms: slow timeout in millisecond
 * @out_value: optional placeholder to hold registry value
 *
 * This routine waits until the target register @reg contains the expected
 * @value after applying the @mask, i.e. it waits until ::
 *
 *     (I915_READ(reg) & mask) == value
 *
 * Otherwise, the wait will timeout after @timeout_ms milliseconds.
 *
 * Returns 0 if the register matches the desired condition, or -ETIMEOUT.
 */
int __intel_wait_for_register(struct intel_uncore *uncore,
                              i915_reg_t reg,
                              u32 mask,
                              u32 value,
                              unsigned int fast_timeout_us,
                              unsigned int slow_timeout_ms,
                              u32 *out_value)
{
        unsigned fw =
                intel_uncore_forcewake_for_reg(uncore, reg, FW_REG_READ);
        u32 reg_value;
        int ret;

        might_sleep_if(slow_timeout_ms);

        spin_lock_irq(&uncore->lock);
        intel_uncore_forcewake_get__locked(uncore, fw);

        ret = __intel_wait_for_register_fw(uncore,
                                           reg, mask, value,
                                           fast_timeout_us, 0, &reg_value);

        intel_uncore_forcewake_put__locked(uncore, fw);
        spin_unlock_irq(&uncore->lock);

        if (ret && slow_timeout_ms)
                ret = __wait_for(reg_value = intel_uncore_read_notrace(uncore,
                                                                       reg),
                                 (reg_value & mask) == value,
                                 slow_timeout_ms * 1000, 10, 1000);

        /* just trace the final value */
        trace_i915_reg_rw(false, reg, reg_value, sizeof(reg_value), true);

        if (out_value)
                *out_value = reg_value;

        return ret;
}

bool intel_uncore_unclaimed_mmio(struct intel_uncore *uncore)
{
        return check_for_unclaimed_mmio(uncore);
}

bool
intel_uncore_arm_unclaimed_mmio_detection(struct intel_uncore *uncore)
{
        bool ret = false;

        spin_lock_irq(&uncore->lock);

        if (unlikely(uncore->unclaimed_mmio_check <= 0))
                goto out;

        if (unlikely(intel_uncore_unclaimed_mmio(uncore))) {
                if (!i915_modparams.mmio_debug) {
                        DRM_DEBUG("Unclaimed register detected, "
                                  "enabling oneshot unclaimed register reporting. "
                                  "Please use i915.mmio_debug=N for more information.\n");
                        i915_modparams.mmio_debug++;
                }
                uncore->unclaimed_mmio_check--;
                ret = true;
        }

out:
        spin_unlock_irq(&uncore->lock);

        return ret;
}

static enum forcewake_domains
intel_uncore_forcewake_for_read(struct intel_uncore *uncore,
                                i915_reg_t reg)
{
        struct drm_i915_private *i915 = uncore_to_i915(uncore);
        u32 offset = i915_mmio_reg_offset(reg);
        enum forcewake_domains fw_domains;

        if (INTEL_GEN(i915) >= 11) {
                fw_domains = __gen11_fwtable_reg_read_fw_domains(uncore, offset);
        } else if (HAS_FWTABLE(i915)) {
                fw_domains = __fwtable_reg_read_fw_domains(uncore, offset);
        } else if (INTEL_GEN(i915) >= 6) {
                fw_domains = __gen6_reg_read_fw_domains(uncore, offset);
        } else {
                /* on devices with FW we expect to hit one of the above cases */
                if (intel_uncore_has_forcewake(uncore))
                        MISSING_CASE(INTEL_GEN(i915));

                fw_domains = 0;
        }

        WARN_ON(fw_domains & ~uncore->fw_domains);

        return fw_domains;
}

static enum forcewake_domains
intel_uncore_forcewake_for_write(struct intel_uncore *uncore,
                                 i915_reg_t reg)
{
        struct drm_i915_private *i915 = uncore_to_i915(uncore);
        u32 offset = i915_mmio_reg_offset(reg);
        enum forcewake_domains fw_domains;

        if (INTEL_GEN(i915) >= 11) {
                fw_domains = __gen11_fwtable_reg_write_fw_domains(uncore, offset);
        } else if (HAS_FWTABLE(i915) && !IS_VALLEYVIEW(i915)) {
                fw_domains = __fwtable_reg_write_fw_domains(uncore, offset);
        } else if (IS_GEN(i915, 8)) {
                fw_domains = __gen8_reg_write_fw_domains(uncore, offset);
        } else if (IS_GEN_RANGE(i915, 6, 7)) {
                fw_domains = FORCEWAKE_RENDER;
        } else {
                /* on devices with FW we expect to hit one of the above cases */
                if (intel_uncore_has_forcewake(uncore))
                        MISSING_CASE(INTEL_GEN(i915));

                fw_domains = 0;
        }

        WARN_ON(fw_domains & ~uncore->fw_domains);

        return fw_domains;
}

/**
 * intel_uncore_forcewake_for_reg - which forcewake domains are needed to access
 *                                  a register
 * @uncore: pointer to struct intel_uncore
 * @reg: register in question
 * @op: operation bitmask of FW_REG_READ and/or FW_REG_WRITE
 *
 * Returns a set of forcewake domains required to be taken with for example
 * intel_uncore_forcewake_get for the specified register to be accessible in the
 * specified mode (read, write or read/write) with raw mmio accessors.
 *
 * NOTE: On Gen6 and Gen7 write forcewake domain (FORCEWAKE_RENDER) requires the
 * callers to do FIFO management on their own or risk losing writes.
 */
enum forcewake_domains
intel_uncore_forcewake_for_reg(struct intel_uncore *uncore,
                               i915_reg_t reg, unsigned int op)
{
        enum forcewake_domains fw_domains = 0;

        WARN_ON(!op);

        if (!intel_uncore_has_forcewake(uncore))
                return 0;

        if (op & FW_REG_READ)
                fw_domains = intel_uncore_forcewake_for_read(uncore, reg);

        if (op & FW_REG_WRITE)
                fw_domains |= intel_uncore_forcewake_for_write(uncore, reg);

        return fw_domains;
}

#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/mock_uncore.c"
#include "selftests/intel_uncore.c"
#endif