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2024-02-19 1c055e55a242a33e574e48be530e06770a210dcd

 kernel/arch/s390/crypto/arch_random.c
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@@ -2,126 +2,17 @@
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 /*
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  * s390 arch random implementation.
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  *
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- * Copyright IBM Corp. 2017, 2018
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+ * Copyright IBM Corp. 2017, 2020
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  * Author(s): Harald Freudenberger
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- *
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- * The s390_arch_random_generate() function may be called from random.c
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- * in interrupt context. So this implementation does the best to be very
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- * fast. There is a buffer of random data which is asynchronously checked
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- * and filled by a workqueue thread.
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- * If there are enough bytes in the buffer the s390_arch_random_generate()
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- * just delivers these bytes. Otherwise false is returned until the
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- * worker thread refills the buffer.
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- * The worker fills the rng buffer by pulling fresh entropy from the
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- * high quality (but slow) true hardware random generator. This entropy
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- * is then spread over the buffer with an pseudo random generator PRNG.
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- * As the arch_get_random_seed_long() fetches 8 bytes and the calling
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- * function add_interrupt_randomness() counts this as 1 bit entropy the
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- * distribution needs to make sure there is in fact 1 bit entropy contained
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- * in 8 bytes of the buffer. The current values pull 32 byte entropy
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- * and scatter this into a 2048 byte buffer. So 8 byte in the buffer
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- * will contain 1 bit of entropy.
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- * The worker thread is rescheduled based on the charge level of the
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- * buffer but at least with 500 ms delay to avoid too much CPU consumption.
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- * So the max. amount of rng data delivered via arch_get_random_seed is
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- * limited to 4k bytes per second.
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  */
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 #include <linux/kernel.h>
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 #include <linux/atomic.h>
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 #include <linux/random.h>
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-#include <linux/slab.h>
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 #include <linux/static_key.h>
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-#include <linux/workqueue.h>
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 #include <asm/cpacf.h>
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 DEFINE_STATIC_KEY_FALSE(s390_arch_random_available);
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 atomic64_t s390_arch_random_counter = ATOMIC64_INIT(0);
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 EXPORT_SYMBOL(s390_arch_random_counter);
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-
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-#define ARCH_REFILL_TICKS (HZ/2)
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-#define ARCH_PRNG_SEED_SIZE 32
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-#define ARCH_RNG_BUF_SIZE 2048
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-
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-static DEFINE_SPINLOCK(arch_rng_lock);
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-static u8 *arch_rng_buf;
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-static unsigned int arch_rng_buf_idx;
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-
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-static void arch_rng_refill_buffer(struct work_struct *);
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-static DECLARE_DELAYED_WORK(arch_rng_work, arch_rng_refill_buffer);
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-
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-bool s390_arch_random_generate(u8 *buf, unsigned int nbytes)
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-{
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-	/* max hunk is ARCH_RNG_BUF_SIZE */
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-	if (nbytes > ARCH_RNG_BUF_SIZE)
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-		return false;
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-
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-	/* lock rng buffer */
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-	if (!spin_trylock(&arch_rng_lock))
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-		return false;
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-
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-	/* try to resolve the requested amount of bytes from the buffer */
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-	arch_rng_buf_idx -= nbytes;
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-	if (arch_rng_buf_idx < ARCH_RNG_BUF_SIZE) {
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-		memcpy(buf, arch_rng_buf + arch_rng_buf_idx, nbytes);
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-		atomic64_add(nbytes, &s390_arch_random_counter);
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-		spin_unlock(&arch_rng_lock);
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-		return true;
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-	}
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-
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-	/* not enough bytes in rng buffer, refill is done asynchronously */
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-	spin_unlock(&arch_rng_lock);
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-
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-	return false;
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-}
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-EXPORT_SYMBOL(s390_arch_random_generate);
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-
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-static void arch_rng_refill_buffer(struct work_struct *unused)
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-{
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-	unsigned int delay = ARCH_REFILL_TICKS;
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-
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-	spin_lock(&arch_rng_lock);
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-	if (arch_rng_buf_idx > ARCH_RNG_BUF_SIZE) {
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-		/* buffer is exhausted and needs refill */
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-		u8 seed[ARCH_PRNG_SEED_SIZE];
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-		u8 prng_wa[240];
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-		/* fetch ARCH_PRNG_SEED_SIZE bytes of entropy */
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-		cpacf_trng(NULL, 0, seed, sizeof(seed));
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-		/* blow this entropy up to ARCH_RNG_BUF_SIZE with PRNG */
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-		memset(prng_wa, 0, sizeof(prng_wa));
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-		cpacf_prno(CPACF_PRNO_SHA512_DRNG_SEED,
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-			   &prng_wa, NULL, 0, seed, sizeof(seed));
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-		cpacf_prno(CPACF_PRNO_SHA512_DRNG_GEN,
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-			   &prng_wa, arch_rng_buf, ARCH_RNG_BUF_SIZE, NULL, 0);
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-		arch_rng_buf_idx = ARCH_RNG_BUF_SIZE;
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-	}
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-	delay += (ARCH_REFILL_TICKS * arch_rng_buf_idx) / ARCH_RNG_BUF_SIZE;
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-	spin_unlock(&arch_rng_lock);
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-
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-	/* kick next check */
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-	queue_delayed_work(system_long_wq, &arch_rng_work, delay);
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-}
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-
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-static int __init s390_arch_random_init(void)
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-{
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-	/* all the needed PRNO subfunctions available ? */
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-	if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG) &&
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-	    cpacf_query_func(CPACF_PRNO, CPACF_PRNO_SHA512_DRNG_GEN)) {
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-
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-		/* alloc arch random working buffer */
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-		arch_rng_buf = kmalloc(ARCH_RNG_BUF_SIZE, GFP_KERNEL);
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-		if (!arch_rng_buf)
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-			return -ENOMEM;
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-
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-		/* kick worker queue job to fill the random buffer */
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-		queue_delayed_work(system_long_wq,
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-				   &arch_rng_work, ARCH_REFILL_TICKS);
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-
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-		/* enable arch random to the outside world */
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-		static_branch_enable(&s390_arch_random_available);
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-	}
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-
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-	return 0;
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-}
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-arch_initcall(s390_arch_random_init);