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drm/i915: Eliminate per-fw_domain i915 backpointer
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Pass along the drm_i915_private pointer from the caller, rather than
looking it up from each fw_domain during fw_domains_get/_put. This
allows us to then eliminate the backpointer, in exchange for a more
complicated unwrapping procedure in the rare
intel_uncore_fw_release_timer().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170323101944.21627-1-chris@chris-wilson.co.uk
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Chris Wilson committed Mar 23, 2017
1 parent 5d4bac5 commit 577ac4b
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Showing 2 changed files with 60 additions and 50 deletions.
33 changes: 18 additions & 15 deletions drivers/gpu/drm/i915/i915_drv.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -732,21 +732,25 @@ intel_uncore_forcewake_for_reg(struct drm_i915_private *dev_priv,

struct intel_uncore_funcs {
void (*force_wake_get)(struct drm_i915_private *dev_priv,
enum forcewake_domains domains);
enum forcewake_domains domains);
void (*force_wake_put)(struct drm_i915_private *dev_priv,
enum forcewake_domains domains);

uint8_t (*mmio_readb)(struct drm_i915_private *dev_priv, i915_reg_t r, bool trace);
uint16_t (*mmio_readw)(struct drm_i915_private *dev_priv, i915_reg_t r, bool trace);
uint32_t (*mmio_readl)(struct drm_i915_private *dev_priv, i915_reg_t r, bool trace);
uint64_t (*mmio_readq)(struct drm_i915_private *dev_priv, i915_reg_t r, bool trace);

void (*mmio_writeb)(struct drm_i915_private *dev_priv, i915_reg_t r,
uint8_t val, bool trace);
void (*mmio_writew)(struct drm_i915_private *dev_priv, i915_reg_t r,
uint16_t val, bool trace);
void (*mmio_writel)(struct drm_i915_private *dev_priv, i915_reg_t r,
uint32_t val, bool trace);
enum forcewake_domains domains);

uint8_t (*mmio_readb)(struct drm_i915_private *dev_priv,
i915_reg_t r, bool trace);
uint16_t (*mmio_readw)(struct drm_i915_private *dev_priv,
i915_reg_t r, bool trace);
uint32_t (*mmio_readl)(struct drm_i915_private *dev_priv,
i915_reg_t r, bool trace);
uint64_t (*mmio_readq)(struct drm_i915_private *dev_priv,
i915_reg_t r, bool trace);

void (*mmio_writeb)(struct drm_i915_private *dev_priv,
i915_reg_t r, uint8_t val, bool trace);
void (*mmio_writew)(struct drm_i915_private *dev_priv,
i915_reg_t r, uint16_t val, bool trace);
void (*mmio_writel)(struct drm_i915_private *dev_priv,
i915_reg_t r, uint32_t val, bool trace);
};

struct intel_forcewake_range {
Expand All @@ -771,7 +775,6 @@ struct intel_uncore {
enum forcewake_domains fw_domains_active;

struct intel_uncore_forcewake_domain {
struct drm_i915_private *i915;
enum forcewake_domain_id id;
enum forcewake_domains mask;
unsigned wake_count;
Expand Down
77 changes: 42 additions & 35 deletions drivers/gpu/drm/i915/intel_uncore.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -52,10 +52,11 @@ intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id)
}

static inline void
fw_domain_reset(const struct intel_uncore_forcewake_domain *d)
fw_domain_reset(struct drm_i915_private *i915,
const struct intel_uncore_forcewake_domain *d)
{
WARN_ON(!i915_mmio_reg_valid(d->reg_set));
__raw_i915_write32(d->i915, d->reg_set, d->val_reset);
__raw_i915_write32(i915, d->reg_set, d->val_reset);
}

static inline void
Expand All @@ -69,98 +70,104 @@ fw_domain_arm_timer(struct intel_uncore_forcewake_domain *d)
}

static inline void
fw_domain_wait_ack_clear(const struct intel_uncore_forcewake_domain *d)
fw_domain_wait_ack_clear(struct drm_i915_private *i915,
const struct intel_uncore_forcewake_domain *d)
{
if (wait_for_atomic((__raw_i915_read32(d->i915, d->reg_ack) &
if (wait_for_atomic((__raw_i915_read32(i915, d->reg_ack) &
FORCEWAKE_KERNEL) == 0,
FORCEWAKE_ACK_TIMEOUT_MS))
DRM_ERROR("%s: timed out waiting for forcewake ack to clear.\n",
intel_uncore_forcewake_domain_to_str(d->id));
}

static inline void
fw_domain_get(const struct intel_uncore_forcewake_domain *d)
fw_domain_get(struct drm_i915_private *i915,
const struct intel_uncore_forcewake_domain *d)
{
__raw_i915_write32(d->i915, d->reg_set, d->val_set);
__raw_i915_write32(i915, d->reg_set, d->val_set);
}

static inline void
fw_domain_wait_ack(const struct intel_uncore_forcewake_domain *d)
fw_domain_wait_ack(struct drm_i915_private *i915,
const struct intel_uncore_forcewake_domain *d)
{
if (wait_for_atomic((__raw_i915_read32(d->i915, d->reg_ack) &
if (wait_for_atomic((__raw_i915_read32(i915, d->reg_ack) &
FORCEWAKE_KERNEL),
FORCEWAKE_ACK_TIMEOUT_MS))
DRM_ERROR("%s: timed out waiting for forcewake ack request.\n",
intel_uncore_forcewake_domain_to_str(d->id));
}

static inline void
fw_domain_put(const struct intel_uncore_forcewake_domain *d)
fw_domain_put(struct drm_i915_private *i915,
const struct intel_uncore_forcewake_domain *d)
{
__raw_i915_write32(d->i915, d->reg_set, d->val_clear);
__raw_i915_write32(i915, d->reg_set, d->val_clear);
}

static inline void
fw_domain_posting_read(const struct intel_uncore_forcewake_domain *d)
fw_domain_posting_read(struct drm_i915_private *i915,
const struct intel_uncore_forcewake_domain *d)
{
/* something from same cacheline, but not from the set register */
if (i915_mmio_reg_valid(d->reg_post))
__raw_posting_read(d->i915, d->reg_post);
__raw_posting_read(i915, d->reg_post);
}

static void
fw_domains_get(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains)
fw_domains_get(struct drm_i915_private *i915, enum forcewake_domains fw_domains)
{
struct intel_uncore_forcewake_domain *d;

for_each_fw_domain_masked(d, fw_domains, dev_priv) {
fw_domain_wait_ack_clear(d);
fw_domain_get(d);
for_each_fw_domain_masked(d, fw_domains, i915) {
fw_domain_wait_ack_clear(i915, d);
fw_domain_get(i915, d);
}

for_each_fw_domain_masked(d, fw_domains, dev_priv)
fw_domain_wait_ack(d);
for_each_fw_domain_masked(d, fw_domains, i915)
fw_domain_wait_ack(i915, d);

dev_priv->uncore.fw_domains_active |= fw_domains;
i915->uncore.fw_domains_active |= fw_domains;
}

static void
fw_domains_put(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains)
fw_domains_put(struct drm_i915_private *i915, enum forcewake_domains fw_domains)
{
struct intel_uncore_forcewake_domain *d;

for_each_fw_domain_masked(d, fw_domains, dev_priv) {
fw_domain_put(d);
fw_domain_posting_read(d);
for_each_fw_domain_masked(d, fw_domains, i915) {
fw_domain_put(i915, d);
fw_domain_posting_read(i915, d);
}

dev_priv->uncore.fw_domains_active &= ~fw_domains;
i915->uncore.fw_domains_active &= ~fw_domains;
}

static void
fw_domains_posting_read(struct drm_i915_private *dev_priv)
fw_domains_posting_read(struct drm_i915_private *i915)
{
struct intel_uncore_forcewake_domain *d;

/* No need to do for all, just do for first found */
for_each_fw_domain(d, dev_priv) {
fw_domain_posting_read(d);
for_each_fw_domain(d, i915) {
fw_domain_posting_read(i915, d);
break;
}
}

static void
fw_domains_reset(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains)
fw_domains_reset(struct drm_i915_private *i915,
enum forcewake_domains fw_domains)
{
struct intel_uncore_forcewake_domain *d;

if (dev_priv->uncore.fw_domains == 0)
if (i915->uncore.fw_domains == 0)
return;

for_each_fw_domain_masked(d, fw_domains, dev_priv)
fw_domain_reset(d);
for_each_fw_domain_masked(d, fw_domains, i915)
fw_domain_reset(i915, d);

fw_domains_posting_read(dev_priv);
fw_domains_posting_read(i915);
}

static void __gen6_gt_wait_for_thread_c0(struct drm_i915_private *dev_priv)
Expand Down Expand Up @@ -236,7 +243,8 @@ intel_uncore_fw_release_timer(struct hrtimer *timer)
{
struct intel_uncore_forcewake_domain *domain =
container_of(timer, struct intel_uncore_forcewake_domain, timer);
struct drm_i915_private *dev_priv = domain->i915;
struct drm_i915_private *dev_priv =
container_of(domain, struct drm_i915_private, uncore.fw_domain[domain->id]);
unsigned long irqflags;

assert_rpm_device_not_suspended(dev_priv);
Expand Down Expand Up @@ -1161,7 +1169,6 @@ static void fw_domain_init(struct drm_i915_private *dev_priv,
else if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv) || IS_GEN8(dev_priv))
d->reg_post = ECOBUS;

d->i915 = dev_priv;
d->id = domain_id;

BUILD_BUG_ON(FORCEWAKE_RENDER != (1 << FW_DOMAIN_ID_RENDER));
Expand All @@ -1175,7 +1182,7 @@ static void fw_domain_init(struct drm_i915_private *dev_priv,

dev_priv->uncore.fw_domains |= (1 << domain_id);

fw_domain_reset(d);
fw_domain_reset(dev_priv, d);
}

static void intel_uncore_fw_domains_init(struct drm_i915_private *dev_priv)
Expand Down

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