mirror of https://gitee.com/openkylin/linux.git
drm/i915: move more generic utils to i915_utils.h
Reduce clutter from i915_drv.h and intel_drv.h. Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/8c197872384fc35442b738c21ba0da9336e02a85.1556809195.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula
parent
cb36330467
commit
b30ed4cc2e
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@ -3357,50 +3357,6 @@ extern void intel_display_print_error_state(struct drm_i915_error_state_buf *e,
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#define INTEL_BROADCAST_RGB_FULL 1
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#define INTEL_BROADCAST_RGB_LIMITED 2
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static inline unsigned long msecs_to_jiffies_timeout(const unsigned int m)
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{
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unsigned long j = msecs_to_jiffies(m);
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return min_t(unsigned long, MAX_JIFFY_OFFSET, j + 1);
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}
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static inline unsigned long nsecs_to_jiffies_timeout(const u64 n)
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{
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/* nsecs_to_jiffies64() does not guard against overflow */
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if (NSEC_PER_SEC % HZ &&
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div_u64(n, NSEC_PER_SEC) >= MAX_JIFFY_OFFSET / HZ)
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return MAX_JIFFY_OFFSET;
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return min_t(u64, MAX_JIFFY_OFFSET, nsecs_to_jiffies64(n) + 1);
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}
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/*
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* If you need to wait X milliseconds between events A and B, but event B
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* doesn't happen exactly after event A, you record the timestamp (jiffies) of
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* when event A happened, then just before event B you call this function and
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* pass the timestamp as the first argument, and X as the second argument.
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*/
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static inline void
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wait_remaining_ms_from_jiffies(unsigned long timestamp_jiffies, int to_wait_ms)
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{
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unsigned long target_jiffies, tmp_jiffies, remaining_jiffies;
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/*
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* Don't re-read the value of "jiffies" every time since it may change
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* behind our back and break the math.
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*/
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tmp_jiffies = jiffies;
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target_jiffies = timestamp_jiffies +
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msecs_to_jiffies_timeout(to_wait_ms);
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if (time_after(target_jiffies, tmp_jiffies)) {
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remaining_jiffies = target_jiffies - tmp_jiffies;
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while (remaining_jiffies)
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remaining_jiffies =
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schedule_timeout_uninterruptible(remaining_jiffies);
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}
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}
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void i915_memcpy_init_early(struct drm_i915_private *dev_priv);
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bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len);
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@ -26,6 +26,7 @@
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#define __I915_UTILS_H
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#include <linux/list.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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@ -176,6 +177,158 @@ static inline void drain_delayed_work(struct delayed_work *dw)
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} while (delayed_work_pending(dw));
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}
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static inline unsigned long msecs_to_jiffies_timeout(const unsigned int m)
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{
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unsigned long j = msecs_to_jiffies(m);
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return min_t(unsigned long, MAX_JIFFY_OFFSET, j + 1);
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}
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static inline unsigned long nsecs_to_jiffies_timeout(const u64 n)
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{
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/* nsecs_to_jiffies64() does not guard against overflow */
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if (NSEC_PER_SEC % HZ &&
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div_u64(n, NSEC_PER_SEC) >= MAX_JIFFY_OFFSET / HZ)
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return MAX_JIFFY_OFFSET;
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return min_t(u64, MAX_JIFFY_OFFSET, nsecs_to_jiffies64(n) + 1);
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}
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/*
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* If you need to wait X milliseconds between events A and B, but event B
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* doesn't happen exactly after event A, you record the timestamp (jiffies) of
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* when event A happened, then just before event B you call this function and
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* pass the timestamp as the first argument, and X as the second argument.
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*/
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static inline void
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wait_remaining_ms_from_jiffies(unsigned long timestamp_jiffies, int to_wait_ms)
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{
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unsigned long target_jiffies, tmp_jiffies, remaining_jiffies;
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/*
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* Don't re-read the value of "jiffies" every time since it may change
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* behind our back and break the math.
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*/
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tmp_jiffies = jiffies;
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target_jiffies = timestamp_jiffies +
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msecs_to_jiffies_timeout(to_wait_ms);
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if (time_after(target_jiffies, tmp_jiffies)) {
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remaining_jiffies = target_jiffies - tmp_jiffies;
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while (remaining_jiffies)
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remaining_jiffies =
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schedule_timeout_uninterruptible(remaining_jiffies);
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}
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}
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/**
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* __wait_for - magic wait macro
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*
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* Macro to help avoid open coding check/wait/timeout patterns. Note that it's
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* important that we check the condition again after having timed out, since the
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* timeout could be due to preemption or similar and we've never had a chance to
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* check the condition before the timeout.
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*/
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#define __wait_for(OP, COND, US, Wmin, Wmax) ({ \
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const ktime_t end__ = ktime_add_ns(ktime_get_raw(), 1000ll * (US)); \
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long wait__ = (Wmin); /* recommended min for usleep is 10 us */ \
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int ret__; \
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might_sleep(); \
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for (;;) { \
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const bool expired__ = ktime_after(ktime_get_raw(), end__); \
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OP; \
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/* Guarantee COND check prior to timeout */ \
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barrier(); \
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if (COND) { \
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ret__ = 0; \
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break; \
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} \
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if (expired__) { \
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ret__ = -ETIMEDOUT; \
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break; \
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} \
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usleep_range(wait__, wait__ * 2); \
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if (wait__ < (Wmax)) \
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wait__ <<= 1; \
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} \
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ret__; \
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})
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#define _wait_for(COND, US, Wmin, Wmax) __wait_for(, (COND), (US), (Wmin), \
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(Wmax))
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#define wait_for(COND, MS) _wait_for((COND), (MS) * 1000, 10, 1000)
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/* If CONFIG_PREEMPT_COUNT is disabled, in_atomic() always reports false. */
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#if defined(CONFIG_DRM_I915_DEBUG) && defined(CONFIG_PREEMPT_COUNT)
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# define _WAIT_FOR_ATOMIC_CHECK(ATOMIC) WARN_ON_ONCE((ATOMIC) && !in_atomic())
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#else
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# define _WAIT_FOR_ATOMIC_CHECK(ATOMIC) do { } while (0)
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#endif
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#define _wait_for_atomic(COND, US, ATOMIC) \
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({ \
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int cpu, ret, timeout = (US) * 1000; \
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u64 base; \
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_WAIT_FOR_ATOMIC_CHECK(ATOMIC); \
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if (!(ATOMIC)) { \
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preempt_disable(); \
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cpu = smp_processor_id(); \
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} \
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base = local_clock(); \
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for (;;) { \
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u64 now = local_clock(); \
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if (!(ATOMIC)) \
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preempt_enable(); \
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/* Guarantee COND check prior to timeout */ \
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barrier(); \
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if (COND) { \
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ret = 0; \
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break; \
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} \
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if (now - base >= timeout) { \
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ret = -ETIMEDOUT; \
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break; \
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} \
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cpu_relax(); \
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if (!(ATOMIC)) { \
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preempt_disable(); \
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if (unlikely(cpu != smp_processor_id())) { \
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timeout -= now - base; \
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cpu = smp_processor_id(); \
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base = local_clock(); \
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} \
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} \
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} \
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ret; \
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})
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#define wait_for_us(COND, US) \
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({ \
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int ret__; \
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BUILD_BUG_ON(!__builtin_constant_p(US)); \
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if ((US) > 10) \
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ret__ = _wait_for((COND), (US), 10, 10); \
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else \
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ret__ = _wait_for_atomic((COND), (US), 0); \
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ret__; \
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})
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#define wait_for_atomic_us(COND, US) \
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({ \
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BUILD_BUG_ON(!__builtin_constant_p(US)); \
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BUILD_BUG_ON((US) > 50000); \
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_wait_for_atomic((COND), (US), 1); \
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})
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#define wait_for_atomic(COND, MS) wait_for_atomic_us((COND), (MS) * 1000)
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#define KHz(x) (1000 * (x))
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#define MHz(x) KHz(1000 * (x))
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#define KBps(x) (1000 * (x))
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#define MBps(x) KBps(1000 * (x))
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#define GBps(x) ((u64)1000 * MBps((x)))
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static inline const char *yesno(bool v)
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{
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return v ? "yes" : "no";
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@ -46,114 +46,6 @@
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struct drm_printer;
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/**
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* __wait_for - magic wait macro
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*
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* Macro to help avoid open coding check/wait/timeout patterns. Note that it's
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* important that we check the condition again after having timed out, since the
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* timeout could be due to preemption or similar and we've never had a chance to
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* check the condition before the timeout.
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*/
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#define __wait_for(OP, COND, US, Wmin, Wmax) ({ \
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const ktime_t end__ = ktime_add_ns(ktime_get_raw(), 1000ll * (US)); \
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long wait__ = (Wmin); /* recommended min for usleep is 10 us */ \
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int ret__; \
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might_sleep(); \
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for (;;) { \
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const bool expired__ = ktime_after(ktime_get_raw(), end__); \
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OP; \
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/* Guarantee COND check prior to timeout */ \
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barrier(); \
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if (COND) { \
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ret__ = 0; \
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break; \
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} \
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if (expired__) { \
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ret__ = -ETIMEDOUT; \
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break; \
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} \
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usleep_range(wait__, wait__ * 2); \
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if (wait__ < (Wmax)) \
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wait__ <<= 1; \
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} \
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ret__; \
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})
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#define _wait_for(COND, US, Wmin, Wmax) __wait_for(, (COND), (US), (Wmin), \
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(Wmax))
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#define wait_for(COND, MS) _wait_for((COND), (MS) * 1000, 10, 1000)
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/* If CONFIG_PREEMPT_COUNT is disabled, in_atomic() always reports false. */
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#if defined(CONFIG_DRM_I915_DEBUG) && defined(CONFIG_PREEMPT_COUNT)
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# define _WAIT_FOR_ATOMIC_CHECK(ATOMIC) WARN_ON_ONCE((ATOMIC) && !in_atomic())
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#else
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# define _WAIT_FOR_ATOMIC_CHECK(ATOMIC) do { } while (0)
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#endif
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#define _wait_for_atomic(COND, US, ATOMIC) \
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({ \
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int cpu, ret, timeout = (US) * 1000; \
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u64 base; \
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_WAIT_FOR_ATOMIC_CHECK(ATOMIC); \
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if (!(ATOMIC)) { \
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preempt_disable(); \
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cpu = smp_processor_id(); \
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} \
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base = local_clock(); \
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for (;;) { \
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u64 now = local_clock(); \
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if (!(ATOMIC)) \
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preempt_enable(); \
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/* Guarantee COND check prior to timeout */ \
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barrier(); \
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if (COND) { \
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ret = 0; \
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break; \
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} \
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if (now - base >= timeout) { \
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ret = -ETIMEDOUT; \
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break; \
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} \
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cpu_relax(); \
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if (!(ATOMIC)) { \
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preempt_disable(); \
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if (unlikely(cpu != smp_processor_id())) { \
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timeout -= now - base; \
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cpu = smp_processor_id(); \
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base = local_clock(); \
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} \
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} \
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} \
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ret; \
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})
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#define wait_for_us(COND, US) \
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({ \
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int ret__; \
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BUILD_BUG_ON(!__builtin_constant_p(US)); \
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if ((US) > 10) \
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ret__ = _wait_for((COND), (US), 10, 10); \
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else \
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ret__ = _wait_for_atomic((COND), (US), 0); \
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ret__; \
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})
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#define wait_for_atomic_us(COND, US) \
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({ \
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BUILD_BUG_ON(!__builtin_constant_p(US)); \
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BUILD_BUG_ON((US) > 50000); \
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_wait_for_atomic((COND), (US), 1); \
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})
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#define wait_for_atomic(COND, MS) wait_for_atomic_us((COND), (MS) * 1000)
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#define KHz(x) (1000 * (x))
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#define MHz(x) KHz(1000 * (x))
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#define KBps(x) (1000 * (x))
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#define MBps(x) KBps(1000 * (x))
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#define GBps(x) ((u64)1000 * MBps((x)))
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/*
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* Display related stuff
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*/
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