probe_roms: allow to probe expansion ROMs using vendor and device id.

Adds data offset to PCI expansion ROM Data Structure in resource
describing Expansion ROMs. This allows AHCI OROM scanning function
to identify AHCI OROM by device id 0x2822 and vendor id 0x8086.

Signed-off-by: Marcin Labun <marcin.labun@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

platform-intel.c

@@ -166,12 +166,30 @@ static int platform_has_intel_devices(void)
 	return 0;
 }
 
+/*
+ * PCI Expansion ROM Data Structure Format
+ */
+struct pciExpDataStructFormat {
+	__u8  ver[4];
+	__u16 vendorID;
+	__u16 deviceID;
+} __attribute__ ((packed));
+
 static struct imsm_orom imsm_orom;
-static int scan(const void *start, const void *end)
+static int scan(const void *start, const void *end, const void *data)
 {
 	int offset;
 	const struct imsm_orom *imsm_mem;
 	int len = (end - start);
+	struct pciExpDataStructFormat *ptr= (struct pciExpDataStructFormat *)data;
+
+	dprintf("ptr->vendorID: %lx __le16_to_cpu(ptr->deviceID): %lx \n",
+		(ulong) __le16_to_cpu(ptr->vendorID),
+		(ulong) __le16_to_cpu(ptr->deviceID));
+
+	if (!((__le16_to_cpu(ptr->vendorID) == 0x8086) &&
+	      (__le16_to_cpu(ptr->deviceID) == 0x2822)))
+		return 0;
 
 	for (offset = 0; offset < len; offset += 4) {
 		imsm_mem = start + offset;
@@ -180,7 +198,6 @@ static int scan(const void *start, const void *end)
 			return 1;
 		}
 	}
-
 	return 0;
 }
 

probe_roms.c

@@ -20,6 +20,7 @@
  */
 
 #include "probe_roms.h"
+#include "mdadm.h"
 #include <unistd.h>
 #include <signal.h>
 #include <fcntl.h>
@@ -130,50 +131,60 @@ static void *isa_bus_to_virt(unsigned long addr)
 struct resource {
 	unsigned long start;
 	unsigned long end;
+	unsigned long data;
 	const char *name;
 };
 
 static struct resource system_rom_resource = {
 	.name	= "System ROM",
 	.start	= 0xf0000,
+	.data   = 0,
 	.end	= 0xfffff,
 };
 
 static struct resource extension_rom_resource = {
 	.name	= "Extension ROM",
 	.start	= 0xe0000,
+	.data   = 0,
 	.end	= 0xeffff,
 };
 
 static struct resource adapter_rom_resources[] = { {
 	.name 	= "Adapter ROM",
 	.start	= 0xc8000,
+	.data   = 0,
 	.end	= 0,
 }, {
 	.name 	= "Adapter ROM",
 	.start	= 0,
+	.data   = 0,
 	.end	= 0,
 }, {
 	.name 	= "Adapter ROM",
 	.start	= 0,
+	.data   = 0,
 	.end	= 0,
 }, {
 	.name 	= "Adapter ROM",
 	.start	= 0,
+	.data   = 0,
 	.end	= 0,
 }, {
 	.name 	= "Adapter ROM",
 	.start	= 0,
+	.data   = 0,
 	.end	= 0,
 }, {
 	.name 	= "Adapter ROM",
 	.start	= 0,
+	.data   = 0,
 	.end	= 0,
 } };
 
 static struct resource video_rom_resource = {
 	.name 	= "Video ROM",
 	.start	= 0xc0000,
+	.data   = 0,
 	.end	= 0xc7fff,
 };
 
@@ -211,7 +222,8 @@ int scan_adapter_roms(scan_fn fn)
 
 		if (res->start) {
 			found = fn(isa_bus_to_virt(res->start),
-				   isa_bus_to_virt(res->end));
+				   isa_bus_to_virt(res->end),
+				   isa_bus_to_virt(res->data));
 			if (found)
 				break;
 		} else
@@ -232,6 +244,7 @@ void probe_roms(void)
 	unsigned long start, length, upper;
 	unsigned char c;
 	unsigned int i;
+	__u16 val=0;
 
 	if (rom_fd < 0)
 		return;
@@ -284,14 +297,23 @@ void probe_roms(void)
 		/* 0 < length <= 0x7f * 512, historically */
 		length = c * 512;
 
+		/* Retrieve 16-bit pointer to PCI Data Structure (offset 18h-19h)
+		 * The data can be within 64KB forward of the first location
+		 * of this code image. The pointer is in little-endian order
+		 */
+
+		if (probe_address16(rom + 0x18, &val) != 0)
+			continue;
+		val = __le16_to_cpu(val);
+
 		/* but accept any length that fits if checksum okay */
 		if (!length || start + length > upper || !romchecksum(rom, length))
 			continue;
 
 		adapter_rom_resources[i].start = start;
+		adapter_rom_resources[i].data = start + (unsigned long) val;
 		adapter_rom_resources[i].end = start + length - 1;
 
 		start = adapter_rom_resources[i++].end & ~(rom_align - 1);
 	}
 }
-

probe_roms.h

@@ -19,6 +19,6 @@
 
 void probe_roms_exit(void);
 int probe_roms_init(unsigned long align);
-typedef int (*scan_fn)(const void *start, const void *end);
+typedef int (*scan_fn)(const void *start, const void *end, const void *data);
 int scan_adapter_roms(scan_fn fn);
 void probe_roms(void);