From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Shevchenko Subject: Re: [PATCH v14 00/11] Introduce the for_each_set_clump8 macro Date: Fri, 29 Mar 2019 13:38:19 +0200 Message-ID: <20190329113819.GR9224@smile.fi.intel.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: William Breathitt Gray Cc: linus.walleij@linaro.org, bgolaszewski@baylibre.com, akpm@linux-foundation.org, linux-gpio@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux@rasmusvillemoes.dk, yamada.masahiro@socionext.com, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, geert@linux-m68k.org, preid@electromag.com.au, lukas@wunner.de List-Id: linux-arch.vger.kernel.org On Fri, Mar 29, 2019 at 12:03:30PM +0900, William Breathitt Gray wrote: > Changes in v14: > - Redefine bitmap_get_value8, bitmap_set_value8, and find_next_clump8 > as static inline functions > - Rename 'idx' variable to 'index' in the bitmap_get_value8 and > bitmap_set_value8 functions > - Remove superfluous parens in gen_74x164_set_multiple > Thank you! FWIW, Reviewed-by: Andy Shevchenko > While adding GPIO get_multiple/set_multiple callback support for various > drivers, I noticed a pattern of looping manifesting that would be useful > standardized as a macro. > > This patchset introduces the for_each_set_clump8 macro and utilizes it > in several GPIO drivers. The for_each_set_clump macro8 facilitates a > for-loop syntax that iterates over a memory region entire groups of set > bits at a time. > > For example, suppose you would like to iterate over a 32-bit integer 8 > bits at a time, skipping over 8-bit groups with no set bit, where > XXXXXXXX represents the current 8-bit group: > > Example: 10111110 00000000 11111111 00110011 > First loop: 10111110 00000000 11111111 XXXXXXXX > Second loop: 10111110 00000000 XXXXXXXX 00110011 > Third loop: XXXXXXXX 00000000 11111111 00110011 > > Each iteration of the loop returns the next 8-bit group that has at > least one set bit. > > The for_each_set_clump8 macro has four parameters: > > * start: set to the bit offset of the current clump > * clump: set to the current clump value > * bits: bitmap to search within > * size: bitmap size in number of bits > > In this version of the patchset, the for_each_set_clump macro has been > reimplemented and simplified based on the suggestions provided by Rasmus > Villemoes and Andy Shevchenko in the version 4 submission. > > In particular, the function of the for_each_set_clump macro has been > restricted to handle only 8-bit clumps; the drivers that use the > for_each_set_clump macro only handle 8-bit ports so a generic > for_each_set_clump implementation is not necessary. Thus, a solution for > large clumps (i.e. those larger than the width of a bitmap word) can be > postponed until a driver appears that actually requires such a generic > for_each_set_clump implementation. > > For what it's worth, a semi-generic for_each_set_clump (i.e. for clumps > smaller than the width of a bitmap word) can be implemented by simply > replacing the hardcoded '8' and '0xFF' instances with respective > variables. I have not yet had a need for such an implementation, and > since it falls short of a true generic for_each_set_clump function, I > have decided to forgo such an implementation for now. > > In addition, the bitmap_get_value8 and bitmap_set_value8 functions are > introduced to get and set 8-bit values respectively. Their use is based > on the behavior suggested in the patchset version 4 review. > > William Breathitt Gray (11): > bitops: Introduce the for_each_set_clump8 macro > lib/test_bitmap.c: Add for_each_set_clump8 test cases > gpio: 104-dio-48e: Utilize for_each_set_clump8 macro > gpio: 104-idi-48: Utilize for_each_set_clump8 macro > gpio: gpio-mm: Utilize for_each_set_clump8 macro > gpio: ws16c48: Utilize for_each_set_clump8 macro > gpio: pci-idio-16: Utilize for_each_set_clump8 macro > gpio: pcie-idio-24: Utilize for_each_set_clump8 macro > gpio: uniphier: Utilize for_each_set_clump8 macro > gpio: 74x164: Utilize the for_each_set_clump8 macro > thermal: intel: intel_soc_dts_iosf: Utilize for_each_set_clump8 macro > > drivers/gpio/gpio-104-dio-48e.c | 73 ++++---------- > drivers/gpio/gpio-104-idi-48.c | 36 ++----- > drivers/gpio/gpio-74x164.c | 19 ++-- > drivers/gpio/gpio-gpio-mm.c | 73 ++++---------- > drivers/gpio/gpio-pci-idio-16.c | 75 +++++--------- > drivers/gpio/gpio-pcie-idio-24.c | 109 ++++++++------------- > drivers/gpio/gpio-uniphier.c | 16 ++- > drivers/gpio/gpio-ws16c48.c | 73 ++++---------- > drivers/thermal/intel/intel_soc_dts_iosf.c | 29 +++--- > drivers/thermal/intel/intel_soc_dts_iosf.h | 2 - > include/asm-generic/bitops/find.h | 61 ++++++++++++ > include/linux/bitops.h | 5 + > lib/test_bitmap.c | 65 ++++++++++++ > 13 files changed, 299 insertions(+), 337 deletions(-) > > -- > 2.21.0 > -- With Best Regards, Andy Shevchenko From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga02.intel.com ([134.134.136.20]:52229 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728704AbfC2LiZ (ORCPT ); Fri, 29 Mar 2019 07:38:25 -0400 Date: Fri, 29 Mar 2019 13:38:19 +0200 From: Andy Shevchenko Subject: Re: [PATCH v14 00/11] Introduce the for_each_set_clump8 macro Message-ID: <20190329113819.GR9224@smile.fi.intel.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-arch-owner@vger.kernel.org List-ID: To: William Breathitt Gray Cc: linus.walleij@linaro.org, bgolaszewski@baylibre.com, akpm@linux-foundation.org, linux-gpio@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux@rasmusvillemoes.dk, yamada.masahiro@socionext.com, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, geert@linux-m68k.org, preid@electromag.com.au, lukas@wunner.de Message-ID: <20190329113819.9rUIqChBOfa-yJ2oxPS5IwvQ0mqSOVTfOMo6pL92boc@z> On Fri, Mar 29, 2019 at 12:03:30PM +0900, William Breathitt Gray wrote: > Changes in v14: > - Redefine bitmap_get_value8, bitmap_set_value8, and find_next_clump8 > as static inline functions > - Rename 'idx' variable to 'index' in the bitmap_get_value8 and > bitmap_set_value8 functions > - Remove superfluous parens in gen_74x164_set_multiple > Thank you! FWIW, Reviewed-by: Andy Shevchenko > While adding GPIO get_multiple/set_multiple callback support for various > drivers, I noticed a pattern of looping manifesting that would be useful > standardized as a macro. > > This patchset introduces the for_each_set_clump8 macro and utilizes it > in several GPIO drivers. The for_each_set_clump macro8 facilitates a > for-loop syntax that iterates over a memory region entire groups of set > bits at a time. > > For example, suppose you would like to iterate over a 32-bit integer 8 > bits at a time, skipping over 8-bit groups with no set bit, where > XXXXXXXX represents the current 8-bit group: > > Example: 10111110 00000000 11111111 00110011 > First loop: 10111110 00000000 11111111 XXXXXXXX > Second loop: 10111110 00000000 XXXXXXXX 00110011 > Third loop: XXXXXXXX 00000000 11111111 00110011 > > Each iteration of the loop returns the next 8-bit group that has at > least one set bit. > > The for_each_set_clump8 macro has four parameters: > > * start: set to the bit offset of the current clump > * clump: set to the current clump value > * bits: bitmap to search within > * size: bitmap size in number of bits > > In this version of the patchset, the for_each_set_clump macro has been > reimplemented and simplified based on the suggestions provided by Rasmus > Villemoes and Andy Shevchenko in the version 4 submission. > > In particular, the function of the for_each_set_clump macro has been > restricted to handle only 8-bit clumps; the drivers that use the > for_each_set_clump macro only handle 8-bit ports so a generic > for_each_set_clump implementation is not necessary. Thus, a solution for > large clumps (i.e. those larger than the width of a bitmap word) can be > postponed until a driver appears that actually requires such a generic > for_each_set_clump implementation. > > For what it's worth, a semi-generic for_each_set_clump (i.e. for clumps > smaller than the width of a bitmap word) can be implemented by simply > replacing the hardcoded '8' and '0xFF' instances with respective > variables. I have not yet had a need for such an implementation, and > since it falls short of a true generic for_each_set_clump function, I > have decided to forgo such an implementation for now. > > In addition, the bitmap_get_value8 and bitmap_set_value8 functions are > introduced to get and set 8-bit values respectively. Their use is based > on the behavior suggested in the patchset version 4 review. > > William Breathitt Gray (11): > bitops: Introduce the for_each_set_clump8 macro > lib/test_bitmap.c: Add for_each_set_clump8 test cases > gpio: 104-dio-48e: Utilize for_each_set_clump8 macro > gpio: 104-idi-48: Utilize for_each_set_clump8 macro > gpio: gpio-mm: Utilize for_each_set_clump8 macro > gpio: ws16c48: Utilize for_each_set_clump8 macro > gpio: pci-idio-16: Utilize for_each_set_clump8 macro > gpio: pcie-idio-24: Utilize for_each_set_clump8 macro > gpio: uniphier: Utilize for_each_set_clump8 macro > gpio: 74x164: Utilize the for_each_set_clump8 macro > thermal: intel: intel_soc_dts_iosf: Utilize for_each_set_clump8 macro > > drivers/gpio/gpio-104-dio-48e.c | 73 ++++---------- > drivers/gpio/gpio-104-idi-48.c | 36 ++----- > drivers/gpio/gpio-74x164.c | 19 ++-- > drivers/gpio/gpio-gpio-mm.c | 73 ++++---------- > drivers/gpio/gpio-pci-idio-16.c | 75 +++++--------- > drivers/gpio/gpio-pcie-idio-24.c | 109 ++++++++------------- > drivers/gpio/gpio-uniphier.c | 16 ++- > drivers/gpio/gpio-ws16c48.c | 73 ++++---------- > drivers/thermal/intel/intel_soc_dts_iosf.c | 29 +++--- > drivers/thermal/intel/intel_soc_dts_iosf.h | 2 - > include/asm-generic/bitops/find.h | 61 ++++++++++++ > include/linux/bitops.h | 5 + > lib/test_bitmap.c | 65 ++++++++++++ > 13 files changed, 299 insertions(+), 337 deletions(-) > > -- > 2.21.0 > -- With Best Regards, Andy Shevchenko