bitops: Introduce a more generic BITMASK macro

GENMASK is used to create a contiguous bitmask([hi:lo]). It is
implemented twice in current kernel. One is in EDAC driver, the other
is in SiS/XGI FB driver. Move it to a more generic place for other
usage.

Signed-off-by: Chen, Gong <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Thomas Winischhofer <[e-mail]>
Cc: Jean-Christophe Plagniol-Villard <[e-mail]>
Cc: Tomi Valkeinen <[e-mail]>
Acked-by: Borislav Petkov <[e-mail]>
Acked-by: Mauro Carvalho Chehab <[e-mail]>
Signed-off-by: Tony Luck <[e-mail]>

drivers/edac/amd64_edac.c

···
 	if (pvt->fam == 0xf && pvt->ext_model < K8_REV_F) {
 		csbase		= pvt->csels[dct].csbases[csrow];
 		csmask		= pvt->csels[dct].csmasks[csrow];
-		base_bits	= GENMASK(21, 31) | GENMASK(9, 15);
-		mask_bits	= GENMASK(21, 29) | GENMASK(9, 15);
+		base_bits	= GENMASK_ULL(31, 21) | GENMASK_ULL(15, 9);
+		mask_bits	= GENMASK_ULL(29, 21) | GENMASK_ULL(15, 9);
 		addr_shift	= 4;
 
 	/*
···
 		csbase          = pvt->csels[dct].csbases[csrow];
 		csmask          = pvt->csels[dct].csmasks[csrow >> 1];
 
-		*base  = (csbase & GENMASK(5,  15)) << 6;
-		*base |= (csbase & GENMASK(19, 30)) << 8;
+		*base  = (csbase & GENMASK_ULL(15,  5)) << 6;
+		*base |= (csbase & GENMASK_ULL(30, 19)) << 8;
 
 		*mask = ~0ULL;
 		/* poke holes for the csmask */
-		*mask &= ~((GENMASK(5, 15)  << 6) |
-			   (GENMASK(19, 30) << 8));
+		*mask &= ~((GENMASK_ULL(15, 5)  << 6) |
+			   (GENMASK_ULL(30, 19) << 8));
 
-		*mask |= (csmask & GENMASK(5, 15))  << 6;
-		*mask |= (csmask & GENMASK(19, 30)) << 8;
+		*mask |= (csmask & GENMASK_ULL(15, 5))  << 6;
+		*mask |= (csmask & GENMASK_ULL(30, 19)) << 8;
 
 		return;
 	} else {
···
 		addr_shift	= 8;
 
 		if (pvt->fam == 0x15)
-			base_bits = mask_bits = GENMASK(19,30) | GENMASK(5,13);
+			base_bits = mask_bits =
+				GENMASK_ULL(30,19) | GENMASK_ULL(13,5);
 		else
-			base_bits = mask_bits = GENMASK(19,28) | GENMASK(5,13);
+			base_bits = mask_bits =
+				GENMASK_ULL(28,19) | GENMASK_ULL(13,5);
 	}
 
 	*base  = (csbase & base_bits) << addr_shift;
···
 	 * section 3.4.2 of AMD publication 24592: AMD x86-64 Architecture
 	 * Programmer's Manual Volume 1 Application Programming.
 	 */
-	dram_addr = (sys_addr & GENMASK(0, 39)) - dram_base;
+	dram_addr = (sys_addr & GENMASK_ULL(39, 0)) - dram_base;
 
 	edac_dbg(2, "using DRAM Base register to translate SysAddr 0x%lx to DramAddr 0x%lx\n",
 		 (unsigned long)sys_addr, (unsigned long)dram_addr);
···
 	 * concerning translating a DramAddr to an InputAddr.
 	 */
 	intlv_shift = num_node_interleave_bits(dram_intlv_en(pvt, 0));
-	input_addr = ((dram_addr >> intlv_shift) & GENMASK(12, 35)) +
+	input_addr = ((dram_addr >> intlv_shift) & GENMASK_ULL(35, 12)) +
 		      (dram_addr & 0xfff);
 
 	edac_dbg(2, "  Intlv Shift=%d DramAddr=0x%lx maps to InputAddr=0x%lx\n",
···
 		end_bit   = 39;
 	}
 
-	addr = m->addr & GENMASK(start_bit, end_bit);
+	addr = m->addr & GENMASK_ULL(end_bit, start_bit);
 
 	/*
 	 * Erratum 637 workaround
···
 		u16 mce_nid;
 		u8 intlv_en;
 
-		if ((addr & GENMASK(24, 47)) >> 24 != 0x00fdf7)
+		if ((addr & GENMASK_ULL(47, 24)) >> 24 != 0x00fdf7)
 			return addr;
 
 		mce_nid	= amd_get_nb_id(m->extcpu);
···
 		intlv_en = tmp >> 21 & 0x7;
 
 		/* add [47:27] + 3 trailing bits */
-		cc6_base  = (tmp & GENMASK(0, 20)) << 3;
+		cc6_base  = (tmp & GENMASK_ULL(20, 0)) << 3;
 
 		/* reverse and add DramIntlvEn */
 		cc6_base |= intlv_en ^ 0x7;
···
 		cc6_base <<= 24;
 
 		if (!intlv_en)
-			return cc6_base | (addr & GENMASK(0, 23));
+			return cc6_base | (addr & GENMASK_ULL(23, 0));
 
 		amd64_read_pci_cfg(pvt->F1, DRAM_LOCAL_NODE_BASE, &tmp);
 
 							/* faster log2 */
-		tmp_addr  = (addr & GENMASK(12, 23)) << __fls(intlv_en + 1);
+		tmp_addr  = (addr & GENMASK_ULL(23, 12)) << __fls(intlv_en + 1);
 
 		/* OR DramIntlvSel into bits [14:12] */
-		tmp_addr |= (tmp & GENMASK(21, 23)) >> 9;
+		tmp_addr |= (tmp & GENMASK_ULL(23, 21)) >> 9;
 
 		/* add remaining [11:0] bits from original MC4_ADDR */
-		tmp_addr |= addr & GENMASK(0, 11);
+		tmp_addr |= addr & GENMASK_ULL(11, 0);
 
 		return cc6_base | tmp_addr;
 	}
···
 
 	amd64_read_pci_cfg(f1, DRAM_LOCAL_NODE_LIM, &llim);
 
-	pvt->ranges[range].lim.lo &= GENMASK(0, 15);
+	pvt->ranges[range].lim.lo &= GENMASK_ULL(15, 0);
 
 				    /* {[39:27],111b} */
 	pvt->ranges[range].lim.lo |= ((llim & 0x1fff) << 3 | 0x7) << 16;
 
-	pvt->ranges[range].lim.hi &= GENMASK(0, 7);
+	pvt->ranges[range].lim.hi &= GENMASK_ULL(7, 0);
 
 				    /* [47:40] */
 	pvt->ranges[range].lim.hi |= llim >> 13;
···
 			chan_off = dram_base;
 	}
 
-	return (sys_addr & GENMASK(6,47)) - (chan_off & GENMASK(23,47));
+	return (sys_addr & GENMASK_ULL(47,6)) - (chan_off & GENMASK_ULL(47,23));
 }
 
 /*

drivers/edac/amd64_edac.h

···
 #define OFF false
 
 /*
- * Create a contiguous bitmask starting at bit position @lo and ending at
- * position @hi. For example
- *
- * GENMASK(21, 39) gives us the 64bit vector 0x000000ffffe00000.
- */
-#define GENMASK(lo, hi)			(((1ULL << ((hi) - (lo) + 1)) - 1) << (lo))
-
-/*
  * PCI-defined configuration space registers
  */
 #define PCI_DEVICE_ID_AMD_15H_M30H_NB_F1 0x141b

drivers/edac/sb_edac.c

···
  * Get a bit field at register value <v>, from bit <lo> to bit <hi>
  */
 #define GET_BITFIELD(v, lo, hi)	\
-	(((v) & ((1ULL << ((hi) - (lo) + 1)) - 1) << (lo)) >> (lo))
+	(((v) & GENMASK_ULL(hi, lo)) >> (lo))
 
 /*
  * sbridge Memory Controller Registers

drivers/video/sis/init.c

···
 }
 
 #ifndef GETBITSTR
-#define BITMASK(h,l)    	(((unsigned)(1U << ((h)-(l)+1))-1)<<(l))
-#define GENMASK(mask)   	BITMASK(1?mask,0?mask)
-#define GETBITS(var,mask)   	(((var) & GENMASK(mask)) >> (0?mask))
+#define GENBITSMASK(mask)   	GENMASK(1?mask,0?mask)
+#define GETBITS(var,mask)   	(((var) & GENBITSMASK(mask)) >> (0?mask))
 #define GETBITSTR(val,from,to)  ((GETBITS(val,from)) << (0?to))
 #endif
 

include/linux/bitops.h

···
 #define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
 #endif
 
+/*
+ * Create a contiguous bitmask starting at bit position @l and ending at
+ * position @h. For example
+ * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
+ */
+#define GENMASK(h, l)		(((U32_C(1) << ((h) - (l) + 1)) - 1) << (l))
+#define GENMASK_ULL(h, l)	(((U64_C(1) << ((h) - (l) + 1)) - 1) << (l))
+
 extern unsigned int __sw_hweight8(unsigned int w);
 extern unsigned int __sw_hweight16(unsigned int w);
 extern unsigned int __sw_hweight32(unsigned int w);