PNP: convert resource options to single linked list

ISAPNP, PNPBIOS, and ACPI describe the "possible resource settings" of
a device, i.e., the possibilities an OS bus driver has when it assigns
I/O port, MMIO, and other resources to the device.

PNP used to maintain this "possible resource setting" information in
one independent option structure and a list of dependent option
structures for each device.  Each of these option structures had lists
of I/O, memory, IRQ, and DMA resources, for example:

  dev
    independent options
      ind-io0  -> ind-io1  ...
      ind-mem0 -> ind-mem1 ...
      ...
    dependent option set 0
      dep0-io0  -> dep0-io1  ...
      dep0-mem0 -> dep0-mem1 ...
      ...
    dependent option set 1
      dep1-io0  -> dep1-io1  ...
      dep1-mem0 -> dep1-mem1 ...
      ...
    ...

This data structure was designed for ISAPNP, where the OS configures
device resource settings by writing directly to configuration
registers.  The OS can write the registers in arbitrary order much
like it writes PCI BARs.

However, for PNPBIOS and ACPI devices, the OS uses firmware interfaces
that perform device configuration, and it is important to pass the
desired settings to those interfaces in the correct order.  The OS
learns the correct order by using firmware interfaces that return the
"current resource settings" and "possible resource settings," but the
option structures above doesn't store the ordering information.

This patch replaces the independent and dependent lists with a single
list of options.  For example, a device might have possible resource
settings like this:

  dev
    options
      ind-io0 -> dep0-io0 -> dep1->io0 -> ind-io1 ...

All the possible settings are in the same list, in the order they
come from the firmware "possible resource settings" list.  Each entry
is tagged with an independent/dependent flag.  Dependent entries also
have a "set number" and an optional priority value.  All dependent
entries must be assigned from the same set.  For example, the OS can
use all the entries from dependent set 0, or all the entries from
dependent set 1, but it cannot mix entries from set 0 with entries
from set 1.

Prior to this patch PNP didn't keep track of the order of this list,
and it assigned all independent options first, then all dependent
ones.  Using the example above, that resulted in a "desired
configuration" list like this:

  ind->io0 -> ind->io1 -> depN-io0 ...

instead of the list the firmware expects, which looks like this:

  ind->io0 -> depN-io0 -> ind-io1 ...

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Rene Herman <rene.herman@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 31 insertions, 36 deletions

diff --git a/drivers/pnp/pnpbios/rsparser.c b/drivers/pnp/pnpbios/rsparser.c
index db23ba7..ca56767 100644
--- a/drivers/pnp/pnpbios/rsparser.c
+++ b/drivers/pnp/pnpbios/rsparser.c
@@ -216,7 +216,7 @@ len_err:
 
 static __init void pnpbios_parse_mem_option(struct pnp_dev *dev,
 					    unsigned char *p, int size,
-					    struct pnp_option *option)
+					    unsigned int option_flags)
 {
 	resource_size_t min, max, align, len;
 	unsigned char flags;
@@ -226,12 +226,13 @@ static __init void pnpbios_parse_mem_option(struct pnp_dev *dev,
 	align = (p[9] << 8) | p[8];
 	len = ((p[11] << 8) | p[10]) << 8;
 	flags = p[3];
-	pnp_register_mem_resource(dev, option, min, max, align, len, flags);
+	pnp_register_mem_resource(dev, option_flags, min, max, align, len,
+				  flags);
 }
 
 static __init void pnpbios_parse_mem32_option(struct pnp_dev *dev,
 					      unsigned char *p, int size,
-					      struct pnp_option *option)
+					      unsigned int option_flags)
 {
 	resource_size_t min, max, align, len;
 	unsigned char flags;
@@ -241,12 +242,13 @@ static __init void pnpbios_parse_mem32_option(struct pnp_dev *dev,
 	align = (p[15] << 24) | (p[14] << 16) | (p[13] << 8) | p[12];
 	len = (p[19] << 24) | (p[18] << 16) | (p[17] << 8) | p[16];
 	flags = p[3];
-	pnp_register_mem_resource(dev, option, min, max, align, len, flags);
+	pnp_register_mem_resource(dev, option_flags, min, max, align, len,
+				  flags);
 }
 
 static __init void pnpbios_parse_fixed_mem32_option(struct pnp_dev *dev,
 						    unsigned char *p, int size,
-						    struct pnp_option *option)
+						    unsigned int option_flags)
 {
 	resource_size_t base, len;
 	unsigned char flags;
@@ -254,12 +256,12 @@ static __init void pnpbios_parse_fixed_mem32_option(struct pnp_dev *dev,
 	base = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
 	len = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
 	flags = p[3];
-	pnp_register_mem_resource(dev, option, base, base, 0, len, flags);
+	pnp_register_mem_resource(dev, option_flags, base, base, 0, len, flags);
 }
 
 static __init void pnpbios_parse_irq_option(struct pnp_dev *dev,
 					    unsigned char *p, int size,
-					    struct pnp_option *option)
+					    unsigned int option_flags)
 {
 	unsigned long bits;
 	pnp_irq_mask_t map;
@@ -273,19 +275,19 @@ static __init void pnpbios_parse_irq_option(struct pnp_dev *dev,
 	if (size > 2)
 		flags = p[3];
 
-	pnp_register_irq_resource(dev, option, &map, flags);
+	pnp_register_irq_resource(dev, option_flags, &map, flags);
 }
 
 static __init void pnpbios_parse_dma_option(struct pnp_dev *dev,
 					    unsigned char *p, int size,
-					    struct pnp_option *option)
+					    unsigned int option_flags)
 {
-	pnp_register_dma_resource(dev, option, p[1], p[2]);
+	pnp_register_dma_resource(dev, option_flags, p[1], p[2]);
 }
 
 static __init void pnpbios_parse_port_option(struct pnp_dev *dev,
 					     unsigned char *p, int size,
-					     struct pnp_option *option)
+					     unsigned int option_flags)
 {
 	resource_size_t min, max, align, len;
 	unsigned char flags;
@@ -295,38 +297,35 @@ static __init void pnpbios_parse_port_option(struct pnp_dev *dev,
 	align = p[6];
 	len = p[7];
 	flags = p[1] ? IORESOURCE_IO_16BIT_ADDR : 0;
-	pnp_register_port_resource(dev, option, min, max, align, len, flags);
+	pnp_register_port_resource(dev, option_flags, min, max, align, len,
+				   flags);
 }
 
 static __init void pnpbios_parse_fixed_port_option(struct pnp_dev *dev,
 						   unsigned char *p, int size,
-						   struct pnp_option *option)
+						   unsigned int option_flags)
 {
 	resource_size_t base, len;
 
 	base = (p[2] << 8) | p[1];
 	len = p[3];
-	pnp_register_port_resource(dev, option, base, base, 0, len,
+	pnp_register_port_resource(dev, option_flags, base, base, 0, len,
 				   IORESOURCE_IO_FIXED);
 }
 
 static __init unsigned char *
 pnpbios_parse_resource_option_data(unsigned char *p, unsigned char *end,
-					struct pnp_dev *dev)
+				   struct pnp_dev *dev)
 {
 	unsigned int len, tag;
 	int priority;
-	struct pnp_option *option, *option_independent;
+	unsigned int option_flags;
 
 	if (!p)
 		return NULL;
 
 	dev_dbg(&dev->dev, "parse resource options\n");
-
-	option_independent = option = pnp_register_independent_option(dev);
-	if (!option)
-		return NULL;
-
+	option_flags = 0;
 	while ((char *)p < (char *)end) {
 
 		/* determine the type of tag */
@@ -343,37 +342,38 @@ pnpbios_parse_resource_option_data(unsigned char *p, unsigned char *end,
 		case LARGE_TAG_MEM:
 			if (len != 9)
 				goto len_err;
-			pnpbios_parse_mem_option(dev, p, len, option);
+			pnpbios_parse_mem_option(dev, p, len, option_flags);
 			break;
 
 		case LARGE_TAG_MEM32:
 			if (len != 17)
 				goto len_err;
-			pnpbios_parse_mem32_option(dev, p, len, option);
+			pnpbios_parse_mem32_option(dev, p, len, option_flags);
 			break;
 
 		case LARGE_TAG_FIXEDMEM32:
 			if (len != 9)
 				goto len_err;
-			pnpbios_parse_fixed_mem32_option(dev, p, len, option);
+			pnpbios_parse_fixed_mem32_option(dev, p, len,
+							 option_flags);
 			break;
 
 		case SMALL_TAG_IRQ:
 			if (len < 2 || len > 3)
 				goto len_err;
-			pnpbios_parse_irq_option(dev, p, len, option);
+			pnpbios_parse_irq_option(dev, p, len, option_flags);
 			break;
 
 		case SMALL_TAG_DMA:
 			if (len != 2)
 				goto len_err;
-			pnpbios_parse_dma_option(dev, p, len, option);
+			pnpbios_parse_dma_option(dev, p, len, option_flags);
 			break;
 
 		case SMALL_TAG_PORT:
 			if (len != 7)
 				goto len_err;
-			pnpbios_parse_port_option(dev, p, len, option);
+			pnpbios_parse_port_option(dev, p, len, option_flags);
 			break;
 
 		case SMALL_TAG_VENDOR:
@@ -383,7 +383,8 @@ pnpbios_parse_resource_option_data(unsigned char *p, unsigned char *end,
 		case SMALL_TAG_FIXEDPORT:
 			if (len != 3)
 				goto len_err;
-			pnpbios_parse_fixed_port_option(dev, p, len, option);
+			pnpbios_parse_fixed_port_option(dev, p, len,
+							option_flags);
 			break;
 
 		case SMALL_TAG_STARTDEP:
@@ -392,19 +393,13 @@ pnpbios_parse_resource_option_data(unsigned char *p, unsigned char *end,
 			priority = PNP_RES_PRIORITY_ACCEPTABLE;
 			if (len > 0)
 				priority = p[1];
-			option = pnp_register_dependent_option(dev, priority);
-			if (!option)
-				return NULL;
+			option_flags = pnp_new_dependent_set(dev, priority);
 			break;
 
 		case SMALL_TAG_ENDDEP:
 			if (len != 0)
 				goto len_err;
-			if (option_independent == option)
-				dev_warn(&dev->dev, "missing "
-					 "SMALL_TAG_STARTDEP tag\n");
-			option = option_independent;
-			dev_dbg(&dev->dev, "end dependent options\n");
+			option_flags = 0;
 			break;
 
 		case SMALL_TAG_END: