<feed xmlns='http://www.w3.org/2005/Atom'>
<title>linux.git/drivers/char/hw_random, branch v6.15</title>
<subtitle>Linux kernel source tree</subtitle>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/'/>
<entry>
<title>treewide: Switch/rename to timer_delete[_sync]()</title>
<updated>2025-04-05T08:30:12+00:00</updated>
<author>
<name>Thomas Gleixner</name>
<email>tglx@linutronix.de</email>
</author>
<published>2025-04-05T08:17:26+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=8fa7292fee5c5240402371ea89ab285ec856c916'/>
<id>8fa7292fee5c5240402371ea89ab285ec856c916</id>
<content type='text'>
timer_delete[_sync]() replaces del_timer[_sync](). Convert the whole tree
over and remove the historical wrapper inlines.

Conversion was done with coccinelle plus manual fixups where necessary.

Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
timer_delete[_sync]() replaces del_timer[_sync](). Convert the whole tree
over and remove the historical wrapper inlines.

Conversion was done with coccinelle plus manual fixups where necessary.

Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>Merge tag 'v6.15-p1' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6</title>
<updated>2025-03-29T17:01:55+00:00</updated>
<author>
<name>Linus Torvalds</name>
<email>torvalds@linux-foundation.org</email>
</author>
<published>2025-03-29T17:01:55+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=e5e0e6bebef3a21081fd1057c40468d4cff1a60d'/>
<id>e5e0e6bebef3a21081fd1057c40468d4cff1a60d</id>
<content type='text'>
Pull crypto updates from Herbert Xu:
 "API:
   - Remove legacy compression interface
   - Improve scatterwalk API
   - Add request chaining to ahash and acomp
   - Add virtual address support to ahash and acomp
   - Add folio support to acomp
   - Remove NULL dst support from acomp

  Algorithms:
   - Library options are fuly hidden (selected by kernel users only)
   - Add Kerberos5 algorithms
   - Add VAES-based ctr(aes) on x86
   - Ensure LZO respects output buffer length on compression
   - Remove obsolete SIMD fallback code path from arm/ghash-ce

  Drivers:
   - Add support for PCI device 0x1134 in ccp
   - Add support for rk3588's standalone TRNG in rockchip
   - Add Inside Secure SafeXcel EIP-93 crypto engine support in eip93
   - Fix bugs in tegra uncovered by multi-threaded self-test
   - Fix corner cases in hisilicon/sec2

  Others:
   - Add SG_MITER_LOCAL to sg miter
   - Convert ubifs, hibernate and xfrm_ipcomp from legacy API to acomp"

* tag 'v6.15-p1' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (187 commits)
  crypto: testmgr - Add multibuffer acomp testing
  crypto: acomp - Fix synchronous acomp chaining fallback
  crypto: testmgr - Add multibuffer hash testing
  crypto: hash - Fix synchronous ahash chaining fallback
  crypto: arm/ghash-ce - Remove SIMD fallback code path
  crypto: essiv - Replace memcpy() + NUL-termination with strscpy()
  crypto: api - Call crypto_alg_put in crypto_unregister_alg
  crypto: scompress - Fix incorrect stream freeing
  crypto: lib/chacha - remove unused arch-specific init support
  crypto: remove obsolete 'comp' compression API
  crypto: compress_null - drop obsolete 'comp' implementation
  crypto: cavium/zip - drop obsolete 'comp' implementation
  crypto: zstd - drop obsolete 'comp' implementation
  crypto: lzo - drop obsolete 'comp' implementation
  crypto: lzo-rle - drop obsolete 'comp' implementation
  crypto: lz4hc - drop obsolete 'comp' implementation
  crypto: lz4 - drop obsolete 'comp' implementation
  crypto: deflate - drop obsolete 'comp' implementation
  crypto: 842 - drop obsolete 'comp' implementation
  crypto: nx - Migrate to scomp API
  ...
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Pull crypto updates from Herbert Xu:
 "API:
   - Remove legacy compression interface
   - Improve scatterwalk API
   - Add request chaining to ahash and acomp
   - Add virtual address support to ahash and acomp
   - Add folio support to acomp
   - Remove NULL dst support from acomp

  Algorithms:
   - Library options are fuly hidden (selected by kernel users only)
   - Add Kerberos5 algorithms
   - Add VAES-based ctr(aes) on x86
   - Ensure LZO respects output buffer length on compression
   - Remove obsolete SIMD fallback code path from arm/ghash-ce

  Drivers:
   - Add support for PCI device 0x1134 in ccp
   - Add support for rk3588's standalone TRNG in rockchip
   - Add Inside Secure SafeXcel EIP-93 crypto engine support in eip93
   - Fix bugs in tegra uncovered by multi-threaded self-test
   - Fix corner cases in hisilicon/sec2

  Others:
   - Add SG_MITER_LOCAL to sg miter
   - Convert ubifs, hibernate and xfrm_ipcomp from legacy API to acomp"

* tag 'v6.15-p1' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (187 commits)
  crypto: testmgr - Add multibuffer acomp testing
  crypto: acomp - Fix synchronous acomp chaining fallback
  crypto: testmgr - Add multibuffer hash testing
  crypto: hash - Fix synchronous ahash chaining fallback
  crypto: arm/ghash-ce - Remove SIMD fallback code path
  crypto: essiv - Replace memcpy() + NUL-termination with strscpy()
  crypto: api - Call crypto_alg_put in crypto_unregister_alg
  crypto: scompress - Fix incorrect stream freeing
  crypto: lib/chacha - remove unused arch-specific init support
  crypto: remove obsolete 'comp' compression API
  crypto: compress_null - drop obsolete 'comp' implementation
  crypto: cavium/zip - drop obsolete 'comp' implementation
  crypto: zstd - drop obsolete 'comp' implementation
  crypto: lzo - drop obsolete 'comp' implementation
  crypto: lzo-rle - drop obsolete 'comp' implementation
  crypto: lz4hc - drop obsolete 'comp' implementation
  crypto: lz4 - drop obsolete 'comp' implementation
  crypto: deflate - drop obsolete 'comp' implementation
  crypto: 842 - drop obsolete 'comp' implementation
  crypto: nx - Migrate to scomp API
  ...
</pre>
</div>
</content>
</entry>
<entry>
<title>hwrng: Kconfig - Fix indentation of HW_RANDOM_CN10K help text</title>
<updated>2025-03-02T07:19:43+00:00</updated>
<author>
<name>Geert Uytterhoeven</name>
<email>geert+renesas@glider.be</email>
</author>
<published>2025-02-19T15:03:32+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=2291399384c00bf61b117e848f3da6cf14c90f32'/>
<id>2291399384c00bf61b117e848f3da6cf14c90f32</id>
<content type='text'>
Change the indentation of the help text of the HW_RANDOM_CN10K symbol
from one TAB plus one space to one TAB plus two spaces, as is customary.

Signed-off-by: Geert Uytterhoeven &lt;geert+renesas@glider.be&gt;
Reviewed-by: Dragan Simic &lt;dsimic@manjaro.org&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Change the indentation of the help text of the HW_RANDOM_CN10K symbol
from one TAB plus one space to one TAB plus two spaces, as is customary.

Signed-off-by: Geert Uytterhoeven &lt;geert+renesas@glider.be&gt;
Reviewed-by: Dragan Simic &lt;dsimic@manjaro.org&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>hwrng: rockchip - add support for rk3588's standalone TRNG</title>
<updated>2025-02-22T07:56:02+00:00</updated>
<author>
<name>Nicolas Frattaroli</name>
<email>nicolas.frattaroli@collabora.com</email>
</author>
<published>2025-02-04T15:35:50+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=8eff8eb83fc0ae8b5f76220e2bb8644d836e99ff'/>
<id>8eff8eb83fc0ae8b5f76220e2bb8644d836e99ff</id>
<content type='text'>
The RK3588 SoC includes several TRNGs, one part of the Crypto IP block,
and the other one (referred to as "trngv1") as a standalone new IP.

Add support for this new standalone TRNG to the driver by both
generalising it to support multiple different rockchip RNGs and then
implementing the required functionality for the new hardware.

This work was partly based on the downstream vendor driver by Rockchip's
Lin Jinhan, which is why they are listed as a Co-author.

While the hardware does support notifying the CPU with an IRQ when the
random data is ready, I've discovered while implementing the code to use
this interrupt that this results in significantly slower throughput of
the TRNG even when under heavy CPU load. I assume this is because with
only 32 bytes of data per invocation, the overhead of reinitialising a
completion, enabling the interrupt, sleeping and then triggering the
completion in the IRQ handler is way more expensive than busylooping.

Speaking of busylooping, the poll interval for reading the ISTAT is an
atomic read with a delay of 0. In my testing, I've found that this gives
us the largest throughput, and it appears the random data is ready
pretty much the moment we begin polling, as increasing the poll delay
leads to a drop in throughput significant enough to not just be due to
the poll interval missing the ideal timing by a microsecond or two.

According to downstream, the IP should take 1024 clock cycles to
generate 56 bits of random data, which at 150MHz should work out to
6.8us. I did not test whether the data really does take 256/56*6.8us
to arrive, though changing the readl to a __raw_readl makes no
difference in throughput, and this data does pass the rngtest FIPS
checks, so I'm not entirely sure what's going on but I presume it's got
something to do with the AHB bus speed and the memory barriers that
mainline's readl/writel functions insert.

The only other current SoC that uses this new IP is the Rockchip RV1106,
but that SoC does not have mainline support as of the time of writing,
so we make no effort to declare it as supported for now.

Co-developed-by: Lin Jinhan &lt;troy.lin@rock-chips.com&gt;
Signed-off-by: Lin Jinhan &lt;troy.lin@rock-chips.com&gt;
Signed-off-by: Nicolas Frattaroli &lt;nicolas.frattaroli@collabora.com&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
The RK3588 SoC includes several TRNGs, one part of the Crypto IP block,
and the other one (referred to as "trngv1") as a standalone new IP.

Add support for this new standalone TRNG to the driver by both
generalising it to support multiple different rockchip RNGs and then
implementing the required functionality for the new hardware.

This work was partly based on the downstream vendor driver by Rockchip's
Lin Jinhan, which is why they are listed as a Co-author.

While the hardware does support notifying the CPU with an IRQ when the
random data is ready, I've discovered while implementing the code to use
this interrupt that this results in significantly slower throughput of
the TRNG even when under heavy CPU load. I assume this is because with
only 32 bytes of data per invocation, the overhead of reinitialising a
completion, enabling the interrupt, sleeping and then triggering the
completion in the IRQ handler is way more expensive than busylooping.

Speaking of busylooping, the poll interval for reading the ISTAT is an
atomic read with a delay of 0. In my testing, I've found that this gives
us the largest throughput, and it appears the random data is ready
pretty much the moment we begin polling, as increasing the poll delay
leads to a drop in throughput significant enough to not just be due to
the poll interval missing the ideal timing by a microsecond or two.

According to downstream, the IP should take 1024 clock cycles to
generate 56 bits of random data, which at 150MHz should work out to
6.8us. I did not test whether the data really does take 256/56*6.8us
to arrive, though changing the readl to a __raw_readl makes no
difference in throughput, and this data does pass the rngtest FIPS
checks, so I'm not entirely sure what's going on but I presume it's got
something to do with the AHB bus speed and the memory barriers that
mainline's readl/writel functions insert.

The only other current SoC that uses this new IP is the Rockchip RV1106,
but that SoC does not have mainline support as of the time of writing,
so we make no effort to declare it as supported for now.

Co-developed-by: Lin Jinhan &lt;troy.lin@rock-chips.com&gt;
Signed-off-by: Lin Jinhan &lt;troy.lin@rock-chips.com&gt;
Signed-off-by: Nicolas Frattaroli &lt;nicolas.frattaroli@collabora.com&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>hwrng: rockchip - eliminate some unnecessary dereferences</title>
<updated>2025-02-22T07:56:02+00:00</updated>
<author>
<name>Nicolas Frattaroli</name>
<email>nicolas.frattaroli@collabora.com</email>
</author>
<published>2025-02-04T15:35:49+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=24aaa42ed65c0811b598674a593fc653d643a7e6'/>
<id>24aaa42ed65c0811b598674a593fc653d643a7e6</id>
<content type='text'>
Despite assigning a temporary variable the value of &amp;pdev-&gt;dev early on
in the probe function, the probe function then continues to use this
construct when it could just use the local dev variable instead.

Simplify this by using the local dev variable directly.

Signed-off-by: Nicolas Frattaroli &lt;nicolas.frattaroli@collabora.com&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Despite assigning a temporary variable the value of &amp;pdev-&gt;dev early on
in the probe function, the probe function then continues to use this
construct when it could just use the local dev variable instead.

Simplify this by using the local dev variable directly.

Signed-off-by: Nicolas Frattaroli &lt;nicolas.frattaroli@collabora.com&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>hwrng: rockchip - store dev pointer in driver struct</title>
<updated>2025-02-22T07:56:02+00:00</updated>
<author>
<name>Nicolas Frattaroli</name>
<email>nicolas.frattaroli@collabora.com</email>
</author>
<published>2025-02-04T15:35:48+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=8bb8609293ff3d8998d75c8db605c0529e83bcd9'/>
<id>8bb8609293ff3d8998d75c8db605c0529e83bcd9</id>
<content type='text'>
The rockchip rng driver does a dance to store the dev pointer in the
hwrng's unsigned long "priv" member. However, since the struct hwrng
member of rk_rng is not a pointer, we can use container_of to get the
struct rk_rng instance from just the struct hwrng*, which means we don't
have to subvert what little there is in C of a type system and can
instead store a pointer to the device struct in the rk_rng itself.

Signed-off-by: Nicolas Frattaroli &lt;nicolas.frattaroli@collabora.com&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
The rockchip rng driver does a dance to store the dev pointer in the
hwrng's unsigned long "priv" member. However, since the struct hwrng
member of rk_rng is not a pointer, we can use container_of to get the
struct rk_rng instance from just the struct hwrng*, which means we don't
have to subvert what little there is in C of a type system and can
instead store a pointer to the device struct in the rk_rng itself.

Signed-off-by: Nicolas Frattaroli &lt;nicolas.frattaroli@collabora.com&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>hwrng: timeriomem: Switch to use hrtimer_setup()</title>
<updated>2025-02-18T09:32:34+00:00</updated>
<author>
<name>Nam Cao</name>
<email>namcao@linutronix.de</email>
</author>
<published>2025-02-05T10:39:15+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=8030d4673e9957df30a8a0fa4228917b954f71c0'/>
<id>8030d4673e9957df30a8a0fa4228917b954f71c0</id>
<content type='text'>
hrtimer_setup() takes the callback function pointer as argument and
initializes the timer completely.

Replace hrtimer_init() and the open coded initialization of
hrtimer::function with the new setup mechanism.

Patch was created by using Coccinelle.

Signed-off-by: Nam Cao &lt;namcao@linutronix.de&gt;
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Link: https://lore.kernel.org/all/010640f1668d40894a1721037c56f7a684dbcc5f.1738746821.git.namcao@linutronix.de

</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
hrtimer_setup() takes the callback function pointer as argument and
initializes the timer completely.

Replace hrtimer_init() and the open coded initialization of
hrtimer::function with the new setup mechanism.

Patch was created by using Coccinelle.

Signed-off-by: Nam Cao &lt;namcao@linutronix.de&gt;
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Link: https://lore.kernel.org/all/010640f1668d40894a1721037c56f7a684dbcc5f.1738746821.git.namcao@linutronix.de

</pre>
</div>
</content>
</entry>
<entry>
<title>hwrng: imx-rngc - add runtime pm</title>
<updated>2025-02-09T10:08:12+00:00</updated>
<author>
<name>Martin Kaiser</name>
<email>martin@kaiser.cx</email>
</author>
<published>2025-02-01T18:39:07+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=7a96a64e8689f33c60ff3179ee4bec2b0835eed9'/>
<id>7a96a64e8689f33c60ff3179ee4bec2b0835eed9</id>
<content type='text'>
Add runtime power management to the imx-rngc driver. Disable the
peripheral clock when the rngc is idle.

The callback functions from struct hwrng wake the rngc up when they're
called and set it to idle on exit. Helper functions which are invoked
from the callbacks assume that the rngc is active.

Device init and probe are done before runtime pm is enabled. The
peripheral clock will be handled manually during these steps. Do not use
devres any more to enable/disable the peripheral clock, this conflicts
with runtime pm.

Signed-off-by: Martin Kaiser &lt;martin@kaiser.cx&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Add runtime power management to the imx-rngc driver. Disable the
peripheral clock when the rngc is idle.

The callback functions from struct hwrng wake the rngc up when they're
called and set it to idle on exit. Helper functions which are invoked
from the callbacks assume that the rngc is active.

Device init and probe are done before runtime pm is enabled. The
peripheral clock will be handled manually during these steps. Do not use
devres any more to enable/disable the peripheral clock, this conflicts
with runtime pm.

Signed-off-by: Martin Kaiser &lt;martin@kaiser.cx&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>hwrng: Kconfig - Move one "tristate" Kconfig description to the usual place</title>
<updated>2025-02-09T10:08:11+00:00</updated>
<author>
<name>Dragan Simic</name>
<email>dsimic@manjaro.org</email>
</author>
<published>2025-01-15T13:07:01+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=3371482c89c1e1a2061ab85444e18cc6c7a00f6d'/>
<id>3371482c89c1e1a2061ab85444e18cc6c7a00f6d</id>
<content type='text'>
It's pretty usual to have "tristate" descriptions in Kconfig files placed
immediately after the actual configuration options, so correct the position
of one misplaced "tristate" spotted in the hw_random Kconfig file.

No intended functional changes are introduced by this trivial cleanup.

Signed-off-by: Dragan Simic &lt;dsimic@manjaro.org&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
It's pretty usual to have "tristate" descriptions in Kconfig files placed
immediately after the actual configuration options, so correct the position
of one misplaced "tristate" spotted in the hw_random Kconfig file.

No intended functional changes are introduced by this trivial cleanup.

Signed-off-by: Dragan Simic &lt;dsimic@manjaro.org&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>hwrng: Kconfig - Use tabs as leading whitespace consistently in Kconfig</title>
<updated>2025-02-09T10:08:11+00:00</updated>
<author>
<name>Dragan Simic</name>
<email>dsimic@manjaro.org</email>
</author>
<published>2025-01-15T13:07:00+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=67b78a34e48b981014a9f9336ea649039310d18a'/>
<id>67b78a34e48b981014a9f9336ea649039310d18a</id>
<content type='text'>
Replace instances of leading size-eight groups of space characters with
the usual tab characters, as spotted in the hw_random Kconfig file.

No intended functional changes are introduced by this trivial cleanup.

Signed-off-by: Dragan Simic &lt;dsimic@manjaro.org&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Replace instances of leading size-eight groups of space characters with
the usual tab characters, as spotted in the hw_random Kconfig file.

No intended functional changes are introduced by this trivial cleanup.

Signed-off-by: Dragan Simic &lt;dsimic@manjaro.org&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</pre>
</div>
</content>
</entry>
</feed>
