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Introduce the for_each_set_clump8 macro

PATCH Superseded William Breathitt Gray 3 participants 15 messages Mar 29, 2019 – May 16, 2019

Subsystems (13)
Library code GPIO Generic include/asm header files Thermal +9 more subsystems

v14 of 18 Superseded Latest is v18 →

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William Breathitt Gray

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#0 lore raw

v14 cover Introduce the for_each_set_clump8 macro

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

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(-)
Signature · 1 line
2.21.0
author
#1 lore raw

PATCH v14 1/11 bitops: Introduce the for_each_set_clump8 macro

This macro iterates for each 8-bit group of bits (clump) with set bits, within a bitmap memory region. For each iteration, "start" is set to the bit offset of the found clump, while the respective clump value is stored to the location pointed by "clump". Additionally, the bitmap_get_value8 and bitmap_set_value8 functions are introduced to respectively get and set an 8-bit value in a bitmap memory region.

Suggested-by Andy Shevchenko <[email protected]>
Suggested-by Rasmus Villemoes <[email protected]>
Suggested-by Lukas Wunner <[email protected]>
Cc Arnd Bergmann <[email protected]>
Cc Andrew Morton <[email protected]>
Cc Linus Walleij <[email protected]>
Acked-by Andy Shevchenko <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
---
 include/asm-generic/bitops/find.h | 61 +++++++++++++++++++++++++++++++
 include/linux/bitops.h            |  5 +++
 2 files changed, 66 insertions(+)
include/asm-generic/bitops/find.h +61 -0
index 8a1ee10014de..45aa6d718cbd 100644
@@ -80,4 +80,65 @@ extern unsigned long find_first_zero_bit(const unsigned long *addr,
 
 #endif /* CONFIG_GENERIC_FIND_FIRST_BIT */
 
+/**
+ * bitmap_get_value8 - get an 8-bit value within a memory region
+ * @addr: address to the bitmap memory region
+ * @start: bit offset of the 8-bit value; must be a multiple of 8
+ *
+ * Returns the 8-bit value located at the @start bit offset within the @addr
+ * memory region.
+ */
+static inline unsigned long bitmap_get_value8(const unsigned long *addr,
+					      unsigned long start)
+{
+	const size_t index = BIT_WORD(start);
+	const unsigned long offset = start % BITS_PER_LONG;
+
+	return (addr[index] >> offset) & 0xFF;
+}
+
+/**
+ * bitmap_set_value8 - set an 8-bit value within a memory region
+ * @addr: address to the bitmap memory region
+ * @value: the 8-bit value; values wider than 8 bits may clobber bitmap
+ * @start: bit offset of the 8-bit value; must be a multiple of 8
+ */
+static inline void bitmap_set_value8(unsigned long *addr, unsigned long value,
+				     unsigned long start)
+{
+	const size_t index = BIT_WORD(start);
+	const unsigned long offset = start % BITS_PER_LONG;
+
+	addr[index] &= ~(0xFF << offset);
+	addr[index] |= value << offset;
+}
+
+/**
+ * find_next_clump8 - find next 8-bit clump with set bits in a memory region
+ * @clump: location to store copy of found clump
+ * @addr: address to base the search on
+ * @size: bitmap size in number of bits
+ * @offset: bit offset at which to start searching
+ *
+ * Returns the bit offset for the next set clump; the found clump value is
+ * copied to the location pointed by @clump. If no bits are set, returns @size.
+ */
+static inline unsigned long find_next_clump8(unsigned long *clump,
+					     const unsigned long *addr,
+					     unsigned long size,
+					     unsigned long offset)
+{
+	offset = find_next_bit(addr, size, offset);
+	if (offset == size)
+		return size;
+
+	offset = round_down(offset, 8);
+	*clump = bitmap_get_value8(addr, offset);
+
+	return offset;
+}
+
+#define find_first_clump8(clump, bits, size) \
+	find_next_clump8((clump), (bits), (size), 0)
+
 #endif /*_ASM_GENERIC_BITOPS_FIND_H_ */
include/linux/bitops.h +5 -0
index 602af23b98c7..1d9b5efb9bd4 100644
@@ -40,6 +40,11 @@ extern unsigned long __sw_hweight64(__u64 w);
 	     (bit) < (size);					\
 	     (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
 
+#define for_each_set_clump8(start, clump, bits, size) \
+	for ((start) = find_first_clump8(&(clump), (bits), (size)); \
+	     (start) < (size); \
+	     (start) = find_next_clump8(&(clump), (bits), (size), (start) + 8))
+
 static inline int get_bitmask_order(unsigned int count)
 {
 	int order;
Signature · 1 line
2.21.0
author
#2 lore raw

Re: [PATCH v14 01/11] bitops: Introduce the for_each_set_clump8 macro

Quoted 15 lines · William Breathitt Gray

This macro iterates for each 8-bit group of bits (clump) with set bits, within a bitmap memory region. For each iteration, "start" is set to the bit offset of the found clump, while the respective clump value is stored to the location pointed by "clump". Additionally, the bitmap_get_value8 and bitmap_set_value8 functions are introduced to respectively get and set an 8-bit value in a bitmap memory region.

Suggested-by Andy Shevchenko <[email protected]>
Suggested-by Rasmus Villemoes <[email protected]>
Suggested-by Lukas Wunner <[email protected]>
Cc Arnd Bergmann <[email protected]>
Cc Andrew Morton <[email protected]>
Cc Linus Walleij <[email protected]>
Acked-by Andy Shevchenko <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
Quoted 4 lines
---
 include/asm-generic/bitops/find.h | 61 +++++++++++++++++++++++++++++++
 include/linux/bitops.h            |  5 +++
 2 files changed, 66 insertions(+)

Andrew, Linus,

I reverted your Acked-by/Reviewed-by lines to Cc in this release because the code has significantly changed from the simplification effort. If you are satisfied with these changes, please ack to confirm.

William Breathitt Gray

Reviewed-by on v14 1/11
#3 lore raw

Re: [PATCH v14 01/11] bitops: Introduce the for_each_set_clump8 macro

In reply to William Breathitt Gray
Quoted 7 lines · William Breathitt Gray

This macro iterates for each 8-bit group of bits (clump) with set bits, within a bitmap memory region. For each iteration, "start" is set to the bit offset of the found clump, while the respective clump value is stored to the location pointed by "clump". Additionally, the bitmap_get_value8 and bitmap_set_value8 functions are introduced to respectively get and set an 8-bit value in a bitmap memory region.

Quoted 8 lines
Suggested-by Andy Shevchenko <[email protected]>
Suggested-by Rasmus Villemoes <[email protected]>
Suggested-by Lukas Wunner <[email protected]>
Cc Arnd Bergmann <[email protected]>
Cc Andrew Morton <[email protected]>
Cc Linus Walleij <[email protected]>
Acked-by Andy Shevchenko <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
Reviewed-by Linus Walleij <[email protected]>

Yours,
Linus Walleij

author
#4 lore raw

PATCH v14 2/11 lib/test_bitmap.c: Add for_each_set_clump8 test cases

In reply to William Breathitt Gray

The introduction of the for_each_set_clump8 macro warrants test cases to verify the implementation. This patch adds test case checks for whether an out-of-bounds clump index is returned, a zero clump is returned, or the returned clump value differs from the expected clump value.

Cc Rasmus Villemoes <[email protected]>
Acked-by Andrew Morton <[email protected]>
Reviewed-by Andy Shevchenko <[email protected]>
Reviewed-by Linus Walleij <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
---
 lib/test_bitmap.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
lib/test_bitmap.c +65 -0
index 6cd7d0740005..8d1f268069c1 100644
@@ -88,6 +88,36 @@ __check_eq_u32_array(const char *srcfile, unsigned int line,
 	return true;
 }
 
+static bool __init __check_eq_clump8(const char *srcfile, unsigned int line,
+				    const unsigned int offset,
+				    const unsigned int size,
+				    const unsigned char *const clump_exp,
+				    const unsigned long *const clump)
+{
+	unsigned long exp;
+
+	if (offset >= size) {
+		pr_warn("[%s:%u] bit offset for clump out-of-bounds: expected less than %u, got %u\n",
+			srcfile, line, size, offset);
+		return false;
+	}
+
+	exp = clump_exp[offset / 8];
+	if (!exp) {
+		pr_warn("[%s:%u] bit offset for zero clump: expected nonzero clump, got bit offset %u with clump value 0",
+			srcfile, line, offset);
+		return false;
+	}
+
+	if (*clump != exp) {
+		pr_warn("[%s:%u] expected clump value of 0x%lX, got clump value of 0x%lX",
+			srcfile, line, exp, *clump);
+		return false;
+	}
+
+	return true;
+}
+
 #define __expect_eq(suffix, ...)					\
 	({								\
 		int result = 0;						\

@@ -104,6 +134,7 @@ __check_eq_u32_array(const char *srcfile, unsigned int line,
 #define expect_eq_bitmap(...)		__expect_eq(bitmap, ##__VA_ARGS__)
 #define expect_eq_pbl(...)		__expect_eq(pbl, ##__VA_ARGS__)
 #define expect_eq_u32_array(...)	__expect_eq(u32_array, ##__VA_ARGS__)
+#define expect_eq_clump8(...)		__expect_eq(clump8, ##__VA_ARGS__)
 
 static void __init test_zero_clear(void)
 {

@@ -361,6 +392,39 @@ static void noinline __init test_mem_optimisations(void)
 	}
 }
 
+static const unsigned char clump_exp[] __initconst = {
+	0x01,	/* 1 bit set */
+	0x02,	/* non-edge 1 bit set */
+	0x00,	/* zero bits set */
+	0x38,	/* 3 bits set across 4-bit boundary */
+	0x38,	/* Repeated clump */
+	0x0F,	/* 4 bits set */
+	0xFF,	/* all bits set */
+	0x05,	/* non-adjacent 2 bits set */
+};
+
+static void __init test_for_each_set_clump8(void)
+{
+#define CLUMP_EXP_NUMBITS 64
+	DECLARE_BITMAP(bits, CLUMP_EXP_NUMBITS);
+	unsigned int start;
+	unsigned long clump;
+
+	/* set bitmap to test case */
+	bitmap_zero(bits, CLUMP_EXP_NUMBITS);
+	bitmap_set(bits, 0, 1);		/* 0x01 */
+	bitmap_set(bits, 9, 1);		/* 0x02 */
+	bitmap_set(bits, 27, 3);	/* 0x28 */
+	bitmap_set(bits, 35, 3);	/* 0x28 */
+	bitmap_set(bits, 40, 4);	/* 0x0F */
+	bitmap_set(bits, 48, 8);	/* 0xFF */
+	bitmap_set(bits, 56, 1);	/* 0x05 - part 1 */
+	bitmap_set(bits, 58, 1);	/* 0x05 - part 2 */
+
+	for_each_set_clump8(start, clump, bits, CLUMP_EXP_NUMBITS)
+		expect_eq_clump8(start, CLUMP_EXP_NUMBITS, clump_exp, &clump);
+}
+
 static int __init test_bitmap_init(void)
 {
 	test_zero_clear();

@@ -369,6 +433,7 @@ static int __init test_bitmap_init(void)
 	test_bitmap_arr32();
 	test_bitmap_parselist();
 	test_mem_optimisations();
+	test_for_each_set_clump8();
 
 	if (failed_tests == 0)
 		pr_info("all %u tests passed\n", total_tests);
Signature · 1 line
2.21.0
author
#5 lore raw

PATCH v14 3/11 gpio: 104-dio-48e: Utilize for_each_set_clump8 macro

In reply to William Breathitt Gray

Replace verbose implementation in get_multiple/set_multiple callbacks with for_each_set_clump8 macro to simplify code and improve clarity.

Reviewed-by Linus Walleij <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
---
 drivers/gpio/gpio-104-dio-48e.c | 73 ++++++++++-----------------------
 1 file changed, 21 insertions(+), 52 deletions(-)
drivers/gpio/gpio-104-dio-48e.c +21 -52
index 92c8f944bf64..2fc6d2b11d25 100644
@@ -183,46 +183,25 @@ static int dio48e_gpio_get(struct gpio_chip *chip, unsigned offset)
 	return !!(port_state & mask);
 }
 
+static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
+
 static int dio48e_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
 	unsigned long *bits)
 {
 	struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
-	size_t i;
-	static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
-	const unsigned int gpio_reg_size = 8;
-	unsigned int bits_offset;
-	size_t word_index;
-	unsigned int word_offset;
-	unsigned long word_mask;
-	const unsigned long port_mask = GENMASK(gpio_reg_size - 1, 0);
+	unsigned long offset;
+	unsigned long gpio_mask;
+	unsigned int port_addr;
 	unsigned long port_state;
 
 	/* clear bits array to a clean slate */
 	bitmap_zero(bits, chip->ngpio);
 
-	/* get bits are evaluated a gpio port register at a time */
-	for (i = 0; i < ARRAY_SIZE(ports); i++) {
-		/* gpio offset in bits array */
-		bits_offset = i * gpio_reg_size;
-
-		/* word index for bits array */
-		word_index = BIT_WORD(bits_offset);
-
-		/* gpio offset within current word of bits array */
-		word_offset = bits_offset % BITS_PER_LONG;
-
-		/* mask of get bits for current gpio within current word */
-		word_mask = mask[word_index] & (port_mask << word_offset);
-		if (!word_mask) {
-			/* no get bits in this port so skip to next one */
-			continue;
-		}
-
-		/* read bits from current gpio port */
-		port_state = inb(dio48egpio->base + ports[i]);
+	for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+		port_addr = dio48egpio->base + ports[offset / 8];
+		port_state = inb(port_addr) & gpio_mask;
 
-		/* store acquired bits at respective bits array offset */
-		bits[word_index] |= (port_state << word_offset) & word_mask;
+		bitmap_set_value8(bits, port_state, offset);
 	}
 
 	return 0;

@@ -252,37 +231,27 @@ static void dio48e_gpio_set_multiple(struct gpio_chip *chip,
 	unsigned long *mask, unsigned long *bits)
 {
 	struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
-	unsigned int i;
-	const unsigned int gpio_reg_size = 8;
-	unsigned int port;
-	unsigned int out_port;
-	unsigned int bitmask;
+	unsigned long offset;
+	unsigned long gpio_mask;
+	size_t index;
+	unsigned int port_addr;
+	unsigned long bitmask;
 	unsigned long flags;
 
-	/* set bits are evaluated a gpio register size at a time */
-	for (i = 0; i < chip->ngpio; i += gpio_reg_size) {
-		/* no more set bits in this mask word; skip to the next word */
-		if (!mask[BIT_WORD(i)]) {
-			i = (BIT_WORD(i) + 1) * BITS_PER_LONG - gpio_reg_size;
-			continue;
-		}
+	for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+		index = offset / 8;
+		port_addr = dio48egpio->base + ports[index];
 
-		port = i / gpio_reg_size;
-		out_port = (port > 2) ? port + 1 : port;
-		bitmask = mask[BIT_WORD(i)] & bits[BIT_WORD(i)];
+		bitmask = bitmap_get_value8(bits, offset) & gpio_mask;
 
 		raw_spin_lock_irqsave(&dio48egpio->lock, flags);
 
 		/* update output state data and set device gpio register */
-		dio48egpio->out_state[port] &= ~mask[BIT_WORD(i)];
-		dio48egpio->out_state[port] |= bitmask;
-		outb(dio48egpio->out_state[port], dio48egpio->base + out_port);
+		dio48egpio->out_state[index] &= ~gpio_mask;
+		dio48egpio->out_state[index] |= bitmask;
+		outb(dio48egpio->out_state[index], port_addr);
 
 		raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
-
-		/* prepare for next gpio register set */
-		mask[BIT_WORD(i)] >>= gpio_reg_size;
-		bits[BIT_WORD(i)] >>= gpio_reg_size;
 	}
 }
Signature · 1 line
2.21.0
author
#6 lore raw

PATCH v14 4/11 gpio: 104-idi-48: Utilize for_each_set_clump8 macro

In reply to William Breathitt Gray

Replace verbose implementation in get_multiple/set_multiple callbacks with for_each_set_clump8 macro to simplify code and improve clarity.

Reviewed-by Linus Walleij <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
---
 drivers/gpio/gpio-104-idi-48.c | 36 +++++++---------------------------
 1 file changed, 7 insertions(+), 29 deletions(-)
drivers/gpio/gpio-104-idi-48.c +7 -29
index 88dc6f2449f6..9b43964b0412 100644
@@ -93,42 +93,20 @@ static int idi_48_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
 	unsigned long *bits)
 {
 	struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip);
-	size_t i;
+	unsigned long offset;
+	unsigned long gpio_mask;
 	static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
-	const unsigned int gpio_reg_size = 8;
-	unsigned int bits_offset;
-	size_t word_index;
-	unsigned int word_offset;
-	unsigned long word_mask;
-	const unsigned long port_mask = GENMASK(gpio_reg_size - 1, 0);
+	unsigned int port_addr;
 	unsigned long port_state;
 
 	/* clear bits array to a clean slate */
 	bitmap_zero(bits, chip->ngpio);
 
-	/* get bits are evaluated a gpio port register at a time */
-	for (i = 0; i < ARRAY_SIZE(ports); i++) {
-		/* gpio offset in bits array */
-		bits_offset = i * gpio_reg_size;
+	for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+		port_addr = idi48gpio->base + ports[offset / 8];
+		port_state = inb(port_addr) & gpio_mask;
 
-		/* word index for bits array */
-		word_index = BIT_WORD(bits_offset);
-
-		/* gpio offset within current word of bits array */
-		word_offset = bits_offset % BITS_PER_LONG;
-
-		/* mask of get bits for current gpio within current word */
-		word_mask = mask[word_index] & (port_mask << word_offset);
-		if (!word_mask) {
-			/* no get bits in this port so skip to next one */
-			continue;
-		}
-
-		/* read bits from current gpio port */
-		port_state = inb(idi48gpio->base + ports[i]);
-
-		/* store acquired bits at respective bits array offset */
-		bits[word_index] |= (port_state << word_offset) & word_mask;
+		bitmap_set_value8(bits, port_state, offset);
 	}
 
 	return 0;
Signature · 1 line
2.21.0
author
#7 lore raw

PATCH v14 5/11 gpio: gpio-mm: Utilize for_each_set_clump8 macro

In reply to William Breathitt Gray

Replace verbose implementation in get_multiple/set_multiple callbacks with for_each_set_clump8 macro to simplify code and improve clarity.

Reviewed-by Linus Walleij <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
---
 drivers/gpio/gpio-gpio-mm.c | 73 +++++++++++--------------------------
 1 file changed, 21 insertions(+), 52 deletions(-)
drivers/gpio/gpio-gpio-mm.c +21 -52
index 8c150fd68d9d..0cef50d14c5a 100644
@@ -172,46 +172,25 @@ static int gpiomm_gpio_get(struct gpio_chip *chip, unsigned int offset)
 	return !!(port_state & mask);
 }
 
+static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
+
 static int gpiomm_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
 	unsigned long *bits)
 {
 	struct gpiomm_gpio *const gpiommgpio = gpiochip_get_data(chip);
-	size_t i;
-	static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
-	const unsigned int gpio_reg_size = 8;
-	unsigned int bits_offset;
-	size_t word_index;
-	unsigned int word_offset;
-	unsigned long word_mask;
-	const unsigned long port_mask = GENMASK(gpio_reg_size - 1, 0);
+	unsigned long offset;
+	unsigned long gpio_mask;
+	unsigned int port_addr;
 	unsigned long port_state;
 
 	/* clear bits array to a clean slate */
 	bitmap_zero(bits, chip->ngpio);
 
-	/* get bits are evaluated a gpio port register at a time */
-	for (i = 0; i < ARRAY_SIZE(ports); i++) {
-		/* gpio offset in bits array */
-		bits_offset = i * gpio_reg_size;
-
-		/* word index for bits array */
-		word_index = BIT_WORD(bits_offset);
-
-		/* gpio offset within current word of bits array */
-		word_offset = bits_offset % BITS_PER_LONG;
-
-		/* mask of get bits for current gpio within current word */
-		word_mask = mask[word_index] & (port_mask << word_offset);
-		if (!word_mask) {
-			/* no get bits in this port so skip to next one */
-			continue;
-		}
-
-		/* read bits from current gpio port */
-		port_state = inb(gpiommgpio->base + ports[i]);
+	for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+		port_addr = gpiommgpio->base + ports[offset / 8];
+		port_state = inb(port_addr) & gpio_mask;
 
-		/* store acquired bits at respective bits array offset */
-		bits[word_index] |= (port_state << word_offset) & word_mask;
+		bitmap_set_value8(bits, port_state, offset);
 	}
 
 	return 0;

@@ -242,37 +221,27 @@ static void gpiomm_gpio_set_multiple(struct gpio_chip *chip,
 	unsigned long *mask, unsigned long *bits)
 {
 	struct gpiomm_gpio *const gpiommgpio = gpiochip_get_data(chip);
-	unsigned int i;
-	const unsigned int gpio_reg_size = 8;
-	unsigned int port;
-	unsigned int out_port;
-	unsigned int bitmask;
+	unsigned long offset;
+	unsigned long gpio_mask;
+	size_t index;
+	unsigned int port_addr;
+	unsigned long bitmask;
 	unsigned long flags;
 
-	/* set bits are evaluated a gpio register size at a time */
-	for (i = 0; i < chip->ngpio; i += gpio_reg_size) {
-		/* no more set bits in this mask word; skip to the next word */
-		if (!mask[BIT_WORD(i)]) {
-			i = (BIT_WORD(i) + 1) * BITS_PER_LONG - gpio_reg_size;
-			continue;
-		}
+	for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+		index = offset / 8;
+		port_addr = gpiommgpio->base + ports[index];
 
-		port = i / gpio_reg_size;
-		out_port = (port > 2) ? port + 1 : port;
-		bitmask = mask[BIT_WORD(i)] & bits[BIT_WORD(i)];
+		bitmask = bitmap_get_value8(bits, offset) & gpio_mask;
 
 		spin_lock_irqsave(&gpiommgpio->lock, flags);
 
 		/* update output state data and set device gpio register */
-		gpiommgpio->out_state[port] &= ~mask[BIT_WORD(i)];
-		gpiommgpio->out_state[port] |= bitmask;
-		outb(gpiommgpio->out_state[port], gpiommgpio->base + out_port);
+		gpiommgpio->out_state[index] &= ~gpio_mask;
+		gpiommgpio->out_state[index] |= bitmask;
+		outb(gpiommgpio->out_state[index], port_addr);
 
 		spin_unlock_irqrestore(&gpiommgpio->lock, flags);
-
-		/* prepare for next gpio register set */
-		mask[BIT_WORD(i)] >>= gpio_reg_size;
-		bits[BIT_WORD(i)] >>= gpio_reg_size;
 	}
 }
Signature · 1 line
2.21.0
author
#8 lore raw

PATCH v14 6/11 gpio: ws16c48: Utilize for_each_set_clump8 macro

In reply to William Breathitt Gray

Replace verbose implementation in get_multiple/set_multiple callbacks with for_each_set_clump8 macro to simplify code and improve clarity.

Reviewed-by Linus Walleij <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
---
 drivers/gpio/gpio-ws16c48.c | 73 ++++++++++---------------------------
 1 file changed, 20 insertions(+), 53 deletions(-)
drivers/gpio/gpio-ws16c48.c +20 -53
index 5cf3697bfb15..ee30417d6394 100644
@@ -134,42 +134,19 @@ static int ws16c48_gpio_get_multiple(struct gpio_chip *chip,
 	unsigned long *mask, unsigned long *bits)
 {
 	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	const unsigned int gpio_reg_size = 8;
-	size_t i;
-	const size_t num_ports = chip->ngpio / gpio_reg_size;
-	unsigned int bits_offset;
-	size_t word_index;
-	unsigned int word_offset;
-	unsigned long word_mask;
-	const unsigned long port_mask = GENMASK(gpio_reg_size - 1, 0);
+	unsigned long offset;
+	unsigned long gpio_mask;
+	unsigned int port_addr;
 	unsigned long port_state;
 
 	/* clear bits array to a clean slate */
 	bitmap_zero(bits, chip->ngpio);
 
-	/* get bits are evaluated a gpio port register at a time */
-	for (i = 0; i < num_ports; i++) {
-		/* gpio offset in bits array */
-		bits_offset = i * gpio_reg_size;
+	for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) {
+		port_addr = ws16c48gpio->base + offset / 8;
+		port_state = inb(port_addr) & gpio_mask;
 
-		/* word index for bits array */
-		word_index = BIT_WORD(bits_offset);
-
-		/* gpio offset within current word of bits array */
-		word_offset = bits_offset % BITS_PER_LONG;
-
-		/* mask of get bits for current gpio within current word */
-		word_mask = mask[word_index] & (port_mask << word_offset);
-		if (!word_mask) {
-			/* no get bits in this port so skip to next one */
-			continue;
-		}
-
-		/* read bits from current gpio port */
-		port_state = inb(ws16c48gpio->base + i);
-
-		/* store acquired bits at respective bits array offset */
-		bits[word_index] |= (port_state << word_offset) & word_mask;
+		bitmap_set_value8(bits, port_state, offset);
 	}
 
 	return 0;

@@ -203,39 +180,29 @@ static void ws16c48_gpio_set_multiple(struct gpio_chip *chip,
 	unsigned long *mask, unsigned long *bits)
 {
 	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	unsigned int i;
-	const unsigned int gpio_reg_size = 8;
-	unsigned int port;
-	unsigned int iomask;
-	unsigned int bitmask;
+	unsigned long offset;
+	unsigned long gpio_mask;
+	size_t index;
+	unsigned int port_addr;
+	unsigned long bitmask;
 	unsigned long flags;
 
-	/* set bits are evaluated a gpio register size at a time */
-	for (i = 0; i < chip->ngpio; i += gpio_reg_size) {
-		/* no more set bits in this mask word; skip to the next word */
-		if (!mask[BIT_WORD(i)]) {
-			i = (BIT_WORD(i) + 1) * BITS_PER_LONG - gpio_reg_size;
-			continue;
-		}
-
-		port = i / gpio_reg_size;
+	for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) {
+		index = offset / 8;
+		port_addr = ws16c48gpio->base + index;
 
 		/* mask out GPIO configured for input */
-		iomask = mask[BIT_WORD(i)] & ~ws16c48gpio->io_state[port];
-		bitmask = iomask & bits[BIT_WORD(i)];
+		gpio_mask &= ~ws16c48gpio->io_state[index];
+		bitmask = bitmap_get_value8(bits, offset) & gpio_mask;
 
 		raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
 
 		/* update output state data and set device gpio register */
-		ws16c48gpio->out_state[port] &= ~iomask;
-		ws16c48gpio->out_state[port] |= bitmask;
-		outb(ws16c48gpio->out_state[port], ws16c48gpio->base + port);
+		ws16c48gpio->out_state[index] &= ~gpio_mask;
+		ws16c48gpio->out_state[index] |= bitmask;
+		outb(ws16c48gpio->out_state[index], port_addr);
 
 		raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
-
-		/* prepare for next gpio register set */
-		mask[BIT_WORD(i)] >>= gpio_reg_size;
-		bits[BIT_WORD(i)] >>= gpio_reg_size;
 	}
 }
Signature · 1 line
2.21.0
author
#9 lore raw

PATCH v14 7/11 gpio: pci-idio-16: Utilize for_each_set_clump8 macro

In reply to William Breathitt Gray

Replace verbose implementation in get_multiple/set_multiple callbacks with for_each_set_clump8 macro to simplify code and improve clarity.

Reviewed-by Linus Walleij <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
---
 drivers/gpio/gpio-pci-idio-16.c | 75 ++++++++++++---------------------
 1 file changed, 27 insertions(+), 48 deletions(-)
drivers/gpio/gpio-pci-idio-16.c +27 -48
index 6b7349783223..a67388db28ad 100644
@@ -108,45 +108,23 @@ static int idio_16_gpio_get_multiple(struct gpio_chip *chip,
 	unsigned long *mask, unsigned long *bits)
 {
 	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-	size_t i;
-	const unsigned int gpio_reg_size = 8;
-	unsigned int bits_offset;
-	size_t word_index;
-	unsigned int word_offset;
-	unsigned long word_mask;
-	const unsigned long port_mask = GENMASK(gpio_reg_size - 1, 0);
-	unsigned long port_state;
+	unsigned long offset;
+	unsigned long gpio_mask;
 	void __iomem *ports[] = {
 		&idio16gpio->reg->out0_7, &idio16gpio->reg->out8_15,
 		&idio16gpio->reg->in0_7, &idio16gpio->reg->in8_15,
 	};
+	void __iomem *port_addr;
+	unsigned long port_state;
 
 	/* clear bits array to a clean slate */
 	bitmap_zero(bits, chip->ngpio);
 
-	/* get bits are evaluated a gpio port register at a time */
-	for (i = 0; i < ARRAY_SIZE(ports); i++) {
-		/* gpio offset in bits array */
-		bits_offset = i * gpio_reg_size;
-
-		/* word index for bits array */
-		word_index = BIT_WORD(bits_offset);
-
-		/* gpio offset within current word of bits array */
-		word_offset = bits_offset % BITS_PER_LONG;
-
-		/* mask of get bits for current gpio within current word */
-		word_mask = mask[word_index] & (port_mask << word_offset);
-		if (!word_mask) {
-			/* no get bits in this port so skip to next one */
-			continue;
-		}
+	for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+		port_addr = ports[offset / 8];
+		port_state = ioread8(port_addr) & gpio_mask;
 
-		/* read bits from current gpio port */
-		port_state = ioread8(ports[i]);
-
-		/* store acquired bits at respective bits array offset */
-		bits[word_index] |= (port_state << word_offset) & word_mask;
+		bitmap_set_value8(bits, port_state, offset);
 	}
 
 	return 0;

@@ -186,30 +164,31 @@ static void idio_16_gpio_set_multiple(struct gpio_chip *chip,
 	unsigned long *mask, unsigned long *bits)
 {
 	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
+	unsigned long offset;
+	unsigned long gpio_mask;
+	void __iomem *ports[] = {
+		&idio16gpio->reg->out0_7, &idio16gpio->reg->out8_15,
+	};
+	size_t index;
+	void __iomem *port_addr;
+	unsigned long bitmask;
 	unsigned long flags;
-	unsigned int out_state;
+	unsigned long out_state;
 
-	raw_spin_lock_irqsave(&idio16gpio->lock, flags);
+	for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+		index = offset / 8;
+		port_addr = ports[index];
 
-	/* process output lines 0-7 */
-	if (*mask & 0xFF) {
-		out_state = ioread8(&idio16gpio->reg->out0_7) & ~*mask;
-		out_state |= *mask & *bits;
-		iowrite8(out_state, &idio16gpio->reg->out0_7);
-	}
+		bitmask = bitmap_get_value8(bits, offset) & gpio_mask;
+
+		raw_spin_lock_irqsave(&idio16gpio->lock, flags);
 
-	/* shift to next output line word */
-	*mask >>= 8;
+		out_state = ioread8(port_addr) & ~gpio_mask;
+		out_state |= bitmask;
+		iowrite8(out_state, port_addr);
 
-	/* process output lines 8-15 */
-	if (*mask & 0xFF) {
-		*bits >>= 8;
-		out_state = ioread8(&idio16gpio->reg->out8_15) & ~*mask;
-		out_state |= *mask & *bits;
-		iowrite8(out_state, &idio16gpio->reg->out8_15);
+		raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
 	}
-
-	raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
 }
 
 static void idio_16_irq_ack(struct irq_data *data)
Signature · 1 line
2.21.0
author
#10 lore raw

PATCH v14 8/11 gpio: pcie-idio-24: Utilize for_each_set_clump8 macro

In reply to William Breathitt Gray

Replace verbose implementation in get_multiple/set_multiple callbacks with for_each_set_clump8 macro to simplify code and improve clarity.

Reviewed-by Linus Walleij <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
---
 drivers/gpio/gpio-pcie-idio-24.c | 109 ++++++++++++-------------------
 1 file changed, 40 insertions(+), 69 deletions(-)
drivers/gpio/gpio-pcie-idio-24.c +40 -69
index 52f1647a46fd..924ec916b358 100644
@@ -198,52 +198,34 @@ static int idio_24_gpio_get_multiple(struct gpio_chip *chip,
 	unsigned long *mask, unsigned long *bits)
 {
 	struct idio_24_gpio *const idio24gpio = gpiochip_get_data(chip);
-	size_t i;
-	const unsigned int gpio_reg_size = 8;
-	unsigned int bits_offset;
-	size_t word_index;
-	unsigned int word_offset;
-	unsigned long word_mask;
-	const unsigned long port_mask = GENMASK(gpio_reg_size - 1, 0);
-	unsigned long port_state;
+	unsigned long offset;
+	unsigned long gpio_mask;
 	void __iomem *ports[] = {
 		&idio24gpio->reg->out0_7, &idio24gpio->reg->out8_15,
 		&idio24gpio->reg->out16_23, &idio24gpio->reg->in0_7,
 		&idio24gpio->reg->in8_15, &idio24gpio->reg->in16_23,
 	};
+	size_t index;
+	unsigned long port_state;
 	const unsigned long out_mode_mask = BIT(1);
 
 	/* clear bits array to a clean slate */
 	bitmap_zero(bits, chip->ngpio);
 
-	/* get bits are evaluated a gpio port register at a time */
-	for (i = 0; i < ARRAY_SIZE(ports) + 1; i++) {
-		/* gpio offset in bits array */
-		bits_offset = i * gpio_reg_size;
-
-		/* word index for bits array */
-		word_index = BIT_WORD(bits_offset);
-
-		/* gpio offset within current word of bits array */
-		word_offset = bits_offset % BITS_PER_LONG;
-
-		/* mask of get bits for current gpio within current word */
-		word_mask = mask[word_index] & (port_mask << word_offset);
-		if (!word_mask) {
-			/* no get bits in this port so skip to next one */
-			continue;
-		}
+	for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+		index = offset / 8;
 
 		/* read bits from current gpio port (port 6 is TTL GPIO) */
-		if (i < 6)
-			port_state = ioread8(ports[i]);
+		if (index < 6)
+			port_state = ioread8(ports[index]);
 		else if (ioread8(&idio24gpio->reg->ctl) & out_mode_mask)
 			port_state = ioread8(&idio24gpio->reg->ttl_out0_7);
 		else
 			port_state = ioread8(&idio24gpio->reg->ttl_in0_7);
 
-		/* store acquired bits at respective bits array offset */
-		bits[word_index] |= (port_state << word_offset) & word_mask;
+		port_state &= gpio_mask;
+
+		bitmap_set_value8(bits, port_state, offset);
 	}
 
 	return 0;

@@ -294,59 +276,48 @@ static void idio_24_gpio_set_multiple(struct gpio_chip *chip,
 	unsigned long *mask, unsigned long *bits)
 {
 	struct idio_24_gpio *const idio24gpio = gpiochip_get_data(chip);
-	size_t i;
-	unsigned long bits_offset;
+	unsigned long offset;
 	unsigned long gpio_mask;
-	const unsigned int gpio_reg_size = 8;
-	const unsigned long port_mask = GENMASK(gpio_reg_size, 0);
-	unsigned long flags;
-	unsigned int out_state;
 	void __iomem *ports[] = {
 		&idio24gpio->reg->out0_7, &idio24gpio->reg->out8_15,
 		&idio24gpio->reg->out16_23
 	};
+	size_t index;
+	unsigned long bitmask;
+	unsigned long flags;
+	unsigned long out_state;
 	const unsigned long out_mode_mask = BIT(1);
-	const unsigned int ttl_offset = 48;
-	const size_t ttl_i = BIT_WORD(ttl_offset);
-	const unsigned int word_offset = ttl_offset % BITS_PER_LONG;
-	const unsigned long ttl_mask = (mask[ttl_i] >> word_offset) & port_mask;
-	const unsigned long ttl_bits = (bits[ttl_i] >> word_offset) & ttl_mask;
-
-	/* set bits are processed a gpio port register at a time */
-	for (i = 0; i < ARRAY_SIZE(ports); i++) {
-		/* gpio offset in bits array */
-		bits_offset = i * gpio_reg_size;
-
-		/* check if any set bits for current port */
-		gpio_mask = (*mask >> bits_offset) & port_mask;
-		if (!gpio_mask) {
-			/* no set bits for this port so move on to next port */
-			continue;
-		}
 
-		raw_spin_lock_irqsave(&idio24gpio->lock, flags);
+	for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+		index = offset / 8;
 
-		/* process output lines */
-		out_state = ioread8(ports[i]) & ~gpio_mask;
-		out_state |= (*bits >> bits_offset) & gpio_mask;
-		iowrite8(out_state, ports[i]);
+		bitmask = bitmap_get_value8(bits, offset) & gpio_mask;
 
-		raw_spin_unlock_irqrestore(&idio24gpio->lock, flags);
-	}
+		raw_spin_lock_irqsave(&idio24gpio->lock, flags);
 
-	/* check if setting TTL lines and if they are in output mode */
-	if (!ttl_mask || !(ioread8(&idio24gpio->reg->ctl) & out_mode_mask))
-		return;
+		/* read bits from current gpio port (port 6 is TTL GPIO) */
+		if (index < 6) {
+			out_state = ioread8(ports[index]);
+		} else if (ioread8(&idio24gpio->reg->ctl) & out_mode_mask) {
+			out_state = ioread8(&idio24gpio->reg->ttl_out0_7);
+		} else {
+			/* skip TTL GPIO if set for input */
+			raw_spin_unlock_irqrestore(&idio24gpio->lock, flags);
+			continue;
+		}
 
-	/* handle TTL output */
-	raw_spin_lock_irqsave(&idio24gpio->lock, flags);
+		/* set requested bit states */
+		out_state &= ~gpio_mask;
+		out_state |= bitmask;
 
-	/* process output lines */
-	out_state = ioread8(&idio24gpio->reg->ttl_out0_7) & ~ttl_mask;
-	out_state |= ttl_bits;
-	iowrite8(out_state, &idio24gpio->reg->ttl_out0_7);
+		/* write bits for current gpio port (port 6 is TTL GPIO) */
+		if (index < 6)
+			iowrite8(out_state, ports[index]);
+		else
+			iowrite8(out_state, &idio24gpio->reg->ttl_out0_7);
 
-	raw_spin_unlock_irqrestore(&idio24gpio->lock, flags);
+		raw_spin_unlock_irqrestore(&idio24gpio->lock, flags);
+	}
 }
 
 static void idio_24_irq_ack(struct irq_data *data)
Signature · 1 line
2.21.0
author
#11 lore raw

PATCH v14 9/11 gpio: uniphier: Utilize for_each_set_clump8 macro

In reply to William Breathitt Gray

Replace verbose implementation in set_multiple callback with for_each_set_clump8 macro to simplify code and improve clarity. An improvement in this case is that banks that are not masked will now be skipped.

Cc Masahiro Yamada <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
---
 drivers/gpio/gpio-uniphier.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)
drivers/gpio/gpio-uniphier.c +6 -10
index 0f662b297a95..d79c34e9b23b 100644
@@ -15,9 +15,6 @@
 #include <linux/spinlock.h>
 #include <dt-bindings/gpio/uniphier-gpio.h>
 
-#define UNIPHIER_GPIO_BANK_MASK		\
-				GENMASK((UNIPHIER_GPIO_LINES_PER_BANK) - 1, 0)
-
 #define UNIPHIER_GPIO_IRQ_MAX_NUM	24
 
 #define UNIPHIER_GPIO_PORT_DATA		0x0	/* data */

@@ -147,15 +144,14 @@ static void uniphier_gpio_set(struct gpio_chip *chip,
 static void uniphier_gpio_set_multiple(struct gpio_chip *chip,
 				       unsigned long *mask, unsigned long *bits)
 {
-	unsigned int bank, shift, bank_mask, bank_bits;
-	int i;
+	unsigned long i;
+	unsigned long bank_mask;
+	unsigned long bank;
+	unsigned long bank_bits;
 
-	for (i = 0; i < chip->ngpio; i += UNIPHIER_GPIO_LINES_PER_BANK) {
+	for_each_set_clump8(i, bank_mask, mask, chip->ngpio) {
 		bank = i / UNIPHIER_GPIO_LINES_PER_BANK;
-		shift = i % BITS_PER_LONG;
-		bank_mask = (mask[BIT_WORD(i)] >> shift) &
-						UNIPHIER_GPIO_BANK_MASK;
-		bank_bits = bits[BIT_WORD(i)] >> shift;
+		bank_bits = bitmap_get_value8(bits, i);
 
 		uniphier_gpio_bank_write(chip, bank, UNIPHIER_GPIO_PORT_DATA,
 					 bank_mask, bank_bits);
Signature · 1 line
2.21.0
author
#12 lore raw

PATCH v14 10/11 gpio: 74x164: Utilize the for_each_set_clump8 macro

In reply to William Breathitt Gray

Replace verbose implementation in set_multiple callback with for_each_set_clump8 macro to simplify code and improve clarity.

Suggested-by Andy Shevchenko <[email protected]>
Cc Geert Uytterhoeven <[email protected]>
Cc Phil Reid <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
---
 drivers/gpio/gpio-74x164.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)
drivers/gpio/gpio-74x164.c +9 -10
index fb7b620763a2..de1e8b37e102 100644
@@ -9,6 +9,7 @@
  *  published by the Free Software Foundation.
  */
 
+#include <linux/bitops.h>
 #include <linux/init.h>
 #include <linux/mutex.h>
 #include <linux/spi/spi.h>

@@ -75,20 +76,18 @@ static void gen_74x164_set_multiple(struct gpio_chip *gc, unsigned long *mask,
 				    unsigned long *bits)
 {
 	struct gen_74x164_chip *chip = gpiochip_get_data(gc);
-	unsigned int i, idx, shift;
-	u8 bank, bankmask;
+	unsigned long offset;
+	unsigned long bankmask;
+	size_t bank;
+	unsigned long bitmask;
 
 	mutex_lock(&chip->lock);
-	for (i = 0, bank = chip->registers - 1; i < chip->registers;
-	     i++, bank--) {
-		idx = i / sizeof(*mask);
-		shift = i % sizeof(*mask) * BITS_PER_BYTE;
-		bankmask = mask[idx] >> shift;
-		if (!bankmask)
-			continue;
+	for_each_set_clump8(offset, bankmask, mask, chip->registers * 8) {
+		bank = chip->registers - 1 - offset / 8;
+		bitmask = bitmap_get_value8(bits, offset) & bankmask;
 
 		chip->buffer[bank] &= ~bankmask;
-		chip->buffer[bank] |= bankmask & (bits[idx] >> shift);
+		chip->buffer[bank] |= bitmask;
 	}
 	__gen_74x164_write_config(chip);
 	mutex_unlock(&chip->lock);
Signature · 1 line
2.21.0
author
#13 lore raw

PATCH v14 11/11 thermal: intel: intel_soc_dts_iosf: Utilize for_each_set_clump8 macro

In reply to William Breathitt Gray

Utilize for_each_set_clump8 macro, and the bitmap_set_value8 and bitmap_get_value8 functions, where appropriate. In addition, remove the now unnecessary temp_mask and temp_shift members of the intel_soc_dts_sensor_entry structure.

Suggested-by Andy Shevchenko <[email protected]>
Tested-by Andy Shevchenko <[email protected]>
Signed-off-by William Breathitt Gray <[email protected]>
---
 drivers/thermal/intel/intel_soc_dts_iosf.c | 29 +++++++++++++---------
 drivers/thermal/intel/intel_soc_dts_iosf.h |  2 --
 2 files changed, 17 insertions(+), 14 deletions(-)
drivers/thermal/intel/intel_soc_dts_iosf.c +17 -12
index e0813dfaa278..2aa16b5262e9 100644
@@ -15,6 +15,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/bitops.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>

@@ -111,6 +112,7 @@ static int update_trip_temp(struct intel_soc_dts_sensor_entry *dts,
 {
 	int status;
 	u32 temp_out;
+	unsigned long update_ptps;
 	u32 out;
 	u32 store_ptps;
 	u32 store_ptmc;

@@ -129,8 +131,9 @@ static int update_trip_temp(struct intel_soc_dts_sensor_entry *dts,
 	if (status)
 		return status;
 
-	out = (store_ptps & ~(0xFF << (thres_index * 8)));
-	out |= (temp_out & 0xFF) << (thres_index * 8);
+	update_ptps = store_ptps;
+	bitmap_set_value8(&update_ptps, temp_out & 0xFF, thres_index * 8);
+	out = update_ptps;
 	status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 				SOC_DTS_OFFSET_PTPS, out);
 	if (status)

@@ -232,6 +235,7 @@ static int sys_get_curr_temp(struct thermal_zone_device *tzd,
 	u32 out;
 	struct intel_soc_dts_sensor_entry *dts;
 	struct intel_soc_dts_sensors *sensors;
+	unsigned long temp_raw;
 
 	dts = tzd->devdata;
 	sensors = dts->sensors;

@@ -240,7 +244,8 @@ static int sys_get_curr_temp(struct thermal_zone_device *tzd,
 	if (status)
 		return status;
 
-	out = (out & dts->temp_mask) >> dts->temp_shift;
+	temp_raw = out;
+	out = bitmap_get_value8(&temp_raw, dts->id * 8);
 	out -= SOC_DTS_TJMAX_ENCODING;
 	*temp = sensors->tj_max - out * 1000;
 

@@ -290,10 +295,13 @@ static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts,
 {
 	char name[10];
 	int trip_count = 0;
+	int writable_trip_count = 0;
 	int trip_mask = 0;
 	u32 store_ptps;
 	int ret;
-	int i;
+	unsigned long i;
+	unsigned long trip;
+	unsigned long ptps;
 
 	/* Store status to restor on exit */
 	ret = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,

@@ -302,11 +310,10 @@ static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts,
 		goto err_ret;
 
 	dts->id = id;
-	dts->temp_mask = 0x00FF << (id * 8);
-	dts->temp_shift = id * 8;
 	if (notification_support) {
 		trip_count = min(SOC_MAX_DTS_TRIPS, trip_cnt);
-		trip_mask = BIT(trip_count - read_only_trip_cnt) - 1;
+		writable_trip_count = trip_count - read_only_trip_cnt;
+		trip_mask = GENMASK(writable_trip_count - 1, 0);
 	}
 
 	/* Check if the writable trip we provide is not used by BIOS */

@@ -315,11 +322,9 @@ static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts,
 	if (ret)
 		trip_mask = 0;
 	else {
-		for (i = 0; i < trip_count; ++i) {
-			if (trip_mask & BIT(i))
-				if (store_ptps & (0xff << (i * 8)))
-					trip_mask &= ~BIT(i);
-		}
+		ptps = store_ptps;
+		for_each_set_clump8(i, trip, &ptps, writable_trip_count * 8)
+			trip_mask &= ~BIT(i / 8);
 	}
 	dts->trip_mask = trip_mask;
 	dts->trip_count = trip_count;
drivers/thermal/intel/intel_soc_dts_iosf.h +0 -2
index 625e37bf93dc..d0362d7acdef 100644
@@ -33,8 +33,6 @@ struct intel_soc_dts_sensors;
 
 struct intel_soc_dts_sensor_entry {
 	int id;
-	u32 temp_mask;
-	u32 temp_shift;
 	u32 store_status;
 	u32 trip_mask;
 	u32 trip_count;
Signature · 1 line
2.21.0
Reviewed-by on the v14 series
#14 lore raw
In reply to William Breathitt Gray
Quoted 7 lines · William Breathitt Gray

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 <[email protected]>
Quoted 82 lines

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(-)
Signature · 1 line
2.21.0
Signature · 2 lines
With Best Regards,
Andy Shevchenko