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From 4ec389e3f0c1233f5aa2d5b4e63d96e33d2a37f0 Mon Sep 17 00:00:00 2001
From: Roman Sobanski <roman.sobanski@intel.com>
Date: Tue, 2 Jul 2019 13:29:27 +0200
Subject: [RHEL7.8 PATCH V2 26/47] Enable probe_roms to scan more than 6 roms.
In some cases if more than 6 oroms exist, resource for particular
controller may not be found. Change method for storing
adapter_rom_resources from array to list.
Signed-off-by: Roman Sobanski <roman.sobanski@intel.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>
---
probe_roms.c | 98 ++++++++++++++++++++++++++++++++++--------------------------
1 file changed, 56 insertions(+), 42 deletions(-)
diff --git a/probe_roms.c b/probe_roms.c
index b0b0883..7ea04c7 100644
--- a/probe_roms.c
+++ b/probe_roms.c
@@ -35,6 +35,9 @@ static const int rom_len = 0xf0000 - 0xc0000; /* option-rom memory region */
static int _sigbus;
static unsigned long rom_align;
+static void roms_deinit(void);
+static int roms_init(void);
+
static void sigbus(int sig)
{
_sigbus = 1;
@@ -75,6 +78,7 @@ void probe_roms_exit(void)
munmap(rom_mem, rom_len);
rom_mem = MAP_FAILED;
}
+ roms_deinit();
}
int probe_roms_init(unsigned long align)
@@ -91,6 +95,9 @@ int probe_roms_init(unsigned long align)
else
return -1;
+ if (roms_init())
+ return -1;
+
if (signal(SIGBUS, sigbus) == SIG_ERR)
rc = -1;
if (rc == 0) {
@@ -131,6 +138,7 @@ struct resource {
unsigned long end;
unsigned long data;
const char *name;
+ struct resource *next;
};
static struct resource system_rom_resource = {
@@ -147,37 +155,7 @@ static struct resource extension_rom_resource = {
.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 *adapter_rom_resources;
static struct resource video_rom_resource = {
.name = "Video ROM",
@@ -186,8 +164,35 @@ static struct resource video_rom_resource = {
.end = 0xc7fff,
};
+static int roms_init(void)
+{
+ adapter_rom_resources = malloc(sizeof(struct resource));
+ if (adapter_rom_resources == NULL)
+ return 1;
+ adapter_rom_resources->name = "Adapter ROM";
+ adapter_rom_resources->start = 0xc8000;
+ adapter_rom_resources->data = 0;
+ adapter_rom_resources->end = 0;
+ adapter_rom_resources->next = NULL;
+ return 0;
+}
+
+static void roms_deinit(void)
+{
+ struct resource *res;
+
+ res = adapter_rom_resources;
+ while (res) {
+ struct resource *tmp = res;
+
+ res = res->next;
+ free(tmp);
+ }
+}
+
#define ROMSIGNATURE 0xaa55
+
static int romsignature(const unsigned char *rom)
{
const unsigned short * const ptr = (const unsigned short *)rom;
@@ -208,16 +213,14 @@ static int romchecksum(const unsigned char *rom, unsigned long length)
int scan_adapter_roms(scan_fn fn)
{
/* let scan_fn examing each of the adapter roms found by probe_roms */
- unsigned int i;
+ struct resource *res = adapter_rom_resources;
int found;
if (rom_fd < 0)
return 0;
found = 0;
- for (i = 0; i < ARRAY_SIZE(adapter_rom_resources); i++) {
- struct resource *res = &adapter_rom_resources[i];
-
+ while (res) {
if (res->start) {
found = fn(isa_bus_to_virt(res->start),
isa_bus_to_virt(res->end),
@@ -226,6 +229,7 @@ int scan_adapter_roms(scan_fn fn)
break;
} else
break;
+ res = res->next;
}
return found;
@@ -241,14 +245,14 @@ void probe_roms(void)
const void *rom;
unsigned long start, length, upper;
unsigned char c;
- unsigned int i;
+ struct resource *res = adapter_rom_resources;
__u16 val=0;
if (rom_fd < 0)
return;
/* video rom */
- upper = adapter_rom_resources[0].start;
+ upper = res->start;
for (start = video_rom_resource.start; start < upper; start += rom_align) {
rom = isa_bus_to_virt(start);
if (!romsignature(rom))
@@ -283,8 +287,9 @@ void probe_roms(void)
upper = extension_rom_resource.start;
}
+ struct resource *prev_res = res;
/* check for adapter roms on 2k boundaries */
- for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += rom_align) {
+ for (; start < upper; start += rom_align) {
rom = isa_bus_to_virt(start);
if (!romsignature(rom))
continue;
@@ -308,10 +313,19 @@ void probe_roms(void)
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;
+ if (res == NULL) {
+ res = calloc(1, sizeof(struct resource));
+ if (res == NULL)
+ return;
+ prev_res->next = res;
+ }
+
+ res->start = start;
+ res->data = start + (unsigned long)val;
+ res->end = start + length - 1;
- start = adapter_rom_resources[i++].end & ~(rom_align - 1);
+ start = res->end & ~(rom_align - 1);
+ prev_res = res;
+ res = res->next;
}
}
--
2.7.5