X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;f=utils%2Fhooks%2F30-add-offb.c;fp=utils%2Fhooks%2F30-add-offb.c;h=0000000000000000000000000000000000000000;hb=ff09391bd6294cce5cfc294ce34148f464a8cf3a;hp=aff3844dd5e9f613e8d1717085e108408eb76c9d;hpb=d9e70bb63227a683f808a21be20b3d5e1a474f95;p=petitboot diff --git a/utils/hooks/30-add-offb.c b/utils/hooks/30-add-offb.c deleted file mode 100644 index aff3844..0000000 --- a/utils/hooks/30-add-offb.c +++ /dev/null @@ -1,618 +0,0 @@ - -#define _GNU_SOURCE - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#include - -#include -#include - -static const char *fbdev_name = "fb0"; - -#define MAX_N_CELLS 4 -#define ADDRESS_PROP_SIZE 4096 - -struct offb_ctx { - const char *dtb_name; - void *dtb; - int dtb_node; - const char *path; - struct fb_fix_screeninfo fscreeninfo; - struct fb_var_screeninfo vscreeninfo; -}; - -static int load_dtb(struct offb_ctx *ctx) -{ - char *buf; - int len; - int rc; - - rc = read_file(ctx, ctx->dtb_name, &buf, &len); - if (rc) { - warn("error reading %s", ctx->dtb_name); - return rc; - } - - rc = fdt_check_header(buf); - if (rc || (int)fdt_totalsize(buf) > len) { - warnx("invalid dtb: %s (rc %d)", ctx->dtb_name, rc); - return -1; - } - - len = fdt_totalsize(buf) + ADDRESS_PROP_SIZE; - - ctx->dtb = talloc_array(ctx, char, len); - if (!ctx->dtb) { - warn("Failed to allocate space for dtb\n"); - return -1; - } - fdt_open_into(buf, ctx->dtb, len); - - return 0; -} - -static int fbdev_sysfs_lookup(struct offb_ctx *ctx) -{ - char *path, *linkpath, *nodepath; - int fd, node; - ssize_t rc __attribute__((unused)); - - path = talloc_asprintf(ctx, "/sys/class/graphics/%s", fbdev_name); - if (!path) { - warn("Failed to allocate space for sysfs path\n"); - return -1; - } - - fd = open(path, O_RDONLY | O_DIRECTORY); - if (fd < 0) { - warn("Can't open device %s in sysfs", fbdev_name); - return -1; - } - - linkpath = talloc_zero_array(ctx, char, PATH_MAX + 1); - if (!linkpath) { - warn("Failed to allocate space for link path\n"); - return -1; - } - - rc = readlinkat(fd, "device/of_node", linkpath, PATH_MAX); - if (rc < 0) { - warn("Can't read of_node link for device %s", fbdev_name); - return -1; - } - - /* readlinkat() returns a relative path such as: - * - * ../../../../../../../firmware/devicetree/base/pciex@n/…/vga@0 - * - * We only need the path component from the device tree itself; so - * strip everything before /firmware/devicetree/base - */ - nodepath = strstr(linkpath, "/firmware/devicetree/base/"); - if (!nodepath) { - warnx("Can't resolve device tree link for device %s", - fbdev_name); - return -1; - } - - nodepath += strlen("/firmware/devicetree/base"); - - node = fdt_path_offset(ctx->dtb, nodepath); - if (node < 0) { - warnx("Can't find node %s in device tree: %s", - nodepath, fdt_strerror(node)); - return -1; - } - - ctx->path = nodepath; - ctx->dtb_node = node; - - return 0; -} - -static int fbdev_device_query(struct offb_ctx *ctx) -{ - int fd, rc = -1; - char *path; - - path = talloc_asprintf(ctx, "/dev/%s", fbdev_name); - if (!path) { - warn("Failed to allocate space for device path\n"); - return -1; - } - - fd = open(path, O_RDWR); - if (fd < 0) { - warn("Can't open fb device %s", path); - return -1; - } - - rc = ioctl(fd, FBIOGET_VSCREENINFO, &ctx->vscreeninfo); - if (rc) { - warn("ioctl(FBIOGET_VSCREENINFO) failed"); - goto out; - } - - rc = ioctl(fd, FBIOGET_FSCREENINFO, &ctx->fscreeninfo); - if (rc) { - warn("ioctl(FBIOGET_FSCREENINFO) failed"); - goto out; - } - - fprintf(stderr, "Retrieved framebuffer details:\n"); - fprintf(stderr, "device %s:\n", fbdev_name); - fprintf(stderr, " addr: %lx\n", ctx->fscreeninfo.smem_start); - fprintf(stderr, " len: %" PRIu32 "\n", ctx->fscreeninfo.smem_len); - fprintf(stderr, " line: %d\n", ctx->fscreeninfo.line_length); - fprintf(stderr, " res: %dx%d@%d\n", ctx->vscreeninfo.xres, - ctx->vscreeninfo.yres, - ctx->vscreeninfo.bits_per_pixel); - - rc = 0; - -out: - close(fd); - return rc; -} - -static char *next_dt_name(struct offb_ctx *ctx, const char **path) -{ - const char *c, *p; - char *name; - - p = *path; - - if (p[0] == '/') - p++; - - if (p[0] == '\0') - return NULL; - - c = strchrnul(p, '/'); - - name = talloc_strndup(ctx, p, c - p); - - *path = c; - - return name; -} - -static uint64_t of_read_number(const fdt32_t *data, int n) -{ - uint64_t x; - - x = fdt32_to_cpu(data[0]); - if (n > 1) { - x <<= 32; - x |= fdt32_to_cpu(data[1]); - } - return x; -} - -/* Do a single translation across a PCI bridge. This results in either; - * - Translating a 2-cell CPU address into a 3-cell PCI address, or - * - Translating a 3-cell PCI address into a 3-cell PCI address with a - * different offset. - * - * To simplify translation we make some assumptions about addresses: - * Addresses are either 3 or 2 cells wide - * Size is always 2 cells wide - * The first cell of a 3 cell address is the PCI memory type - */ -static int do_translate(void *fdt, int node, - const fdt32_t *ranges, int range_size, - uint32_t *addr, uint32_t *size, - int *addr_cells, int *size_cells) -{ - uint64_t addr_current_base, addr_child_base, addr_size; - uint64_t addr_current, offset, new_addr; - uint64_t current_pci_flags, child_pci_flags; - int i, na, ns, cna, cns, prop_len; - const fdt32_t *prop; - const char *type; - bool pci = false; - - type = fdt_getprop(fdt, node, "device_type", NULL); - pci = type && (!strcmp(type, "pci") || !strcmp(type, "pciex")); - - /* We don't translate at vga@0, so we should always see a pci or - * pciex device_type */ - if (!pci) - return -1; - - if (range_size == 0) { - fprintf(stderr, "Empty ranges property, 1:1 translation\n"); - return 0; - } - - /* Number of cells for address and size at current level */ - na = *addr_cells; - ns = *size_cells; - - /* Number of cells for address and size at child level */ - prop = fdt_getprop(fdt, node, "#address-cells", &prop_len); - cna = prop ? fdt32_to_cpu(*prop) : 2; - prop = fdt_getprop(fdt, node, "#size-cells", &prop_len); - cns = prop ? fdt32_to_cpu(*prop) : 2; - - /* We're translating back to a PCI address, so the size should grow */ - if (na > cna) { - fprintf(stderr, "na > cna, unexpected\n"); - return -1; - } - - /* If the current address is a PCI address, its type should match the - * type of every subsequent child address */ - current_pci_flags = na > 2 ? of_read_number(addr, 1) : 0; - child_pci_flags = cna > 2 ? of_read_number(ranges, 1) : 0; - if (current_pci_flags != 0 && current_pci_flags != child_pci_flags) { - fprintf(stderr, "Unexpected change in flags: %lx, %lx\n", - current_pci_flags, child_pci_flags); - return -1; - } - - if (ns != cns) { - fprintf(stderr, "Unexpected change in #size-cells: %d vs %d\n", - ns, cns); - return -1; - } - - /* - * The ranges property is of the form - * < upstream addr base > < downstream addr base > < size > - * The current address stored in addr is similarly of the form - * < current address > < size > - * Where either address base and the current address can be a 2-cell - * CPU address or a 3-cell PCI address. - * - * For PCI addresses ignore the type flag in the first cell and use the - * 64-bit address in the remaining 2 cells. - */ - if (na > 2) { - addr_current_base = of_read_number(ranges + cna + 1, na - 1); - addr_current = of_read_number(addr + 1, na - 1); - } else { - addr_current_base = of_read_number(ranges + cna, na); - addr_current = of_read_number(addr, na); - } - if (cna > 2) - addr_child_base = of_read_number(ranges + 1, cna - 1); - else - addr_child_base = of_read_number(ranges, cna); - - /* - * Perform the actual translation. Find the offset of the current - * address from the upstream base, and add the offset to the - * downstream base to find the new address. - * The new address will be cna-cells wide, inheriting child_pci_flags - * as the memory type. - */ - addr_size = of_read_number(size, ns); - offset = addr_current - addr_current_base; - new_addr = addr_child_base + offset; - - memset(addr, 0, *addr_cells); - memset(size, 0, *size_cells); - *addr_cells = cna; - *size_cells = cns; - - /* Update the current address in addr. - * It's highly unlikely any translation will leave us with a 2-cell - * CPU address, but for completeness only include PCI flags if the - * child offset was definitely a PCI address */ - if (*addr_cells > 2) - addr[0] = cpu_to_fdt32(child_pci_flags); - for (i = *addr_cells - 1; i >= *addr_cells - 2; i--) { - addr[i] = cpu_to_fdt32(new_addr & 0xffffffff); - new_addr >>= 32; - } - for (i = *size_cells - 1; i >= 0; i--) { - size[i] = cpu_to_fdt32(addr_size & 0xffffffff); - addr_size >>= 32; - } - - fprintf(stderr, "New address:\n\t"); - for (i = 0; i < *addr_cells; i++) - fprintf(stderr, " %lx ", of_read_number(&addr[i], 1)); - fprintf(stderr, "\n"); - - return 0; -} - -static int create_translated_addresses(struct offb_ctx *ctx, - int dev_node, const char *path, - uint64_t in_addr, uint64_t in_size, - fdt32_t *reg, int reg_cells) -{ - uint32_t addr[MAX_N_CELLS], size[MAX_N_CELLS]; - int addr_cells, size_cells, node, prop_len, ranges_len, rc, i; - const fdt32_t *ranges, *prop; - char *name; - - prop = fdt_getprop(ctx->dtb, 0, "#address-cells", &prop_len); - addr_cells = prop ? fdt32_to_cpu(*prop) : 2; - - prop = fdt_getprop(ctx->dtb, 0, "#size-cells", &prop_len); - size_cells = prop ? fdt32_to_cpu(*prop) : 2; - - memset(addr, 0, sizeof(uint32_t) * MAX_N_CELLS); - for (i = addr_cells - 1; i >= 0; i--) { - addr[i] = cpu_to_fdt32(in_addr & 0xffffffff); - in_addr >>= 32; - } - memset(size, 0, sizeof(uint32_t) * MAX_N_CELLS); - for (i = size_cells - 1; i >= 0; i--) { - size[i] = cpu_to_fdt32(in_size & 0xffffffff); - in_size >>= 32; - } - - node = 0; - for (;;) { - /* get the name of the next child node to 'node' */ - name = next_dt_name(ctx, &path); - if (!name) - return -1; - - node = fdt_subnode_offset(ctx->dtb, node, name); - if (node < 0) - return -1; - if (node == dev_node) - break; - - ranges = fdt_getprop(ctx->dtb, node, "ranges", &ranges_len); - if (!ranges) - return -1; - - rc = do_translate(ctx->dtb, node, ranges, ranges_len, - addr, size, &addr_cells, &size_cells); - if (rc) - return -1; - } - - fprintf(stderr, "Final address:\n\t"); - for (i = 0; i < addr_cells; i++) - fprintf(stderr, " %lx ", of_read_number(&addr[i], 1)); - fprintf(stderr, "\n"); - - if (addr_cells + size_cells > reg_cells) { - fprintf(stderr, "Error: na + ns larger than reg\n"); - return -1; - } - - memcpy(reg, addr, sizeof(fdt32_t) * addr_cells); - memcpy(reg + addr_cells, size, sizeof(fdt32_t) * size_cells); - - return 0; -} - -#define fdt_set_check(dtb, node, fn, prop, ...) \ - do { \ - int __x = fn(dtb, node, prop, __VA_ARGS__); \ - if (__x) { \ - warnx("failed to update device tree (%s): %s", \ - prop, fdt_strerror(__x)); \ - return -1; \ - } \ - } while (0); - -static int populate_devicetree(struct offb_ctx *ctx) -{ - fdt32_t reg[5]; - void *dtb = ctx->dtb; - int rc, node = ctx->dtb_node; - - memset(reg, 0, sizeof(reg)); - rc = create_translated_addresses(ctx, node, ctx->path, - ctx->fscreeninfo.smem_start, - ctx->fscreeninfo.smem_len, - reg, 5); - - if (rc) { - fprintf(stderr, "Failed to translate address\n"); - return rc; - } - - fdt_set_check(dtb, node, fdt_setprop_string, "device_type", "display"); - - fdt_set_check(dtb, node, fdt_setprop, "assigned-addresses", - reg, sizeof(reg)); - - fdt_set_check(dtb, node, fdt_setprop_cell, - "width", ctx->vscreeninfo.xres); - fdt_set_check(dtb, node, fdt_setprop_cell, - "height", ctx->vscreeninfo.yres); - fdt_set_check(dtb, node, fdt_setprop_cell, - "depth", ctx->vscreeninfo.bits_per_pixel); - - fdt_set_check(dtb, node, fdt_setprop, "little-endian", NULL, 0); - fdt_set_check(dtb, node, fdt_setprop, "linux,opened", NULL, 0); - fdt_set_check(dtb, node, fdt_setprop, "linux,boot-display", NULL, 0); - - return 0; -} - -/* - * Find the device tree path assoicated with a hvc device. - * On OPAL all hvc consoles have a 'serial@X' node under ibm,opal/consoles, - * so we make a simplifying assumption that a hvcX is associated with a - * serial@X node. - */ -static char *get_hvc_path(struct offb_ctx *ctx, unsigned int termno) -{ - char *serial; - int node; - - serial = talloc_asprintf(ctx, "serial@%u", termno); - if (!serial) - return NULL; - - node = fdt_subnode_offset(ctx->dtb, 0, "ibm,opal"); - if (node <= 0) { - fprintf(stderr, "Couldn't find ibm,opal\n"); - return NULL; - } - node = fdt_subnode_offset(ctx->dtb, node, "consoles"); - if (node <= 0) { - fprintf(stderr, "Couldn't find ibm,opal/consoles\n"); - return NULL; - } - - node = fdt_subnode_offset(ctx->dtb, node, serial); - if (node <= 0) { - fprintf(stderr, "Could not locate hvc%u\n", termno); - return NULL; - } - - return talloc_asprintf(ctx, "/ibm,opal/consoles/%s", serial); -} - -/* - * Find the device tree path of the vga device. On OPAL we assume there is only - * one of these that represents any 'tty' console. - */ -static char *get_vga_path(struct offb_ctx *ctx) -{ - char *root, *vga_path; - - root = strstr(ctx->path, "/pciex@"); - if (!root) { - fprintf(stderr, "Can't find root path for vga device in below:\n"); - fprintf(stderr, "%s\n", ctx->path); - return NULL; - } - - vga_path = talloc_strdup(ctx, root); - fprintf(stderr, "VGA target at '%s'\n", vga_path); - - return vga_path; -} - -static int set_stdout(struct offb_ctx *ctx) -{ - const char *boot_console, *ptr; - long unsigned int termno; - const fdt32_t *prop; - int node, prop_len; - char *stdout_path; - - boot_console = getenv("boot_console"); - if (!boot_console) { - fprintf(stderr, "boot_console not set, using default stdout for boot\n"); - return 0; - } - - if (strncmp(boot_console, "/dev/", strlen("/dev/")) != 0) { - /* We already have the full path */ - stdout_path = talloc_strdup(ctx, boot_console); - } else if (strstr(boot_console, "tty") != NULL) { - fprintf(stderr, "TTY recognised: %s\n", boot_console); - stdout_path = get_vga_path(ctx); - } else { - ptr = strstr(boot_console, "hvc"); - if (!ptr || strlen(ptr) <= strlen("hvc")) { - fprintf(stderr, "Unrecognised console: %s\n", - boot_console); - return 0; - } - ptr += strlen("hvc"); - errno = 0; - termno = strtoul(ptr, NULL, 0); - if (errno) { - fprintf(stderr, "Couldn't parse termno from %s\n", - boot_console); - return 0; - } - fprintf(stderr, "HVC recognised: %s\n", boot_console); - stdout_path = get_hvc_path(ctx, termno); - } - - if (!stdout_path) { - fprintf(stderr, "Couldn't parse %s into a path\n", - boot_console); - return -1; - } - - fprintf(stderr, "stdout-path: %s\n", stdout_path); - - node = fdt_subnode_offset(ctx->dtb, 0, "chosen"); - if (node <= 0) { - fprintf(stderr, "Failed to find chosen\n"); - return -1; - } - - prop = fdt_getprop(ctx->dtb, node, "linux,stdout-path", &prop_len); - if (!prop) { - fprintf(stderr, "Failed to find linux,stdout-path\n"); - return -1; - } - - fdt_set_check(ctx->dtb, node, fdt_setprop_string, "linux,stdout-path", - stdout_path); - - return 0; -} - -static int write_devicetree(struct offb_ctx *ctx) -{ - int rc; - - fdt_pack(ctx->dtb); - - rc = replace_file(ctx->dtb_name, ctx->dtb, fdt_totalsize(ctx->dtb)); - if (rc) - warn("failed to write file %s", ctx->dtb_name); - - return rc; -} - - -int main(void) -{ - struct offb_ctx *ctx; - int rc; - - ctx = talloc_zero(NULL, struct offb_ctx); - - ctx->dtb_name = getenv("boot_dtb"); - if (!ctx->dtb_name) { - talloc_free(ctx); - return EXIT_SUCCESS; - } - - rc = load_dtb(ctx); - if (rc) - goto out; - - rc = fbdev_sysfs_lookup(ctx); - if (rc) - goto out; - - rc = fbdev_device_query(ctx); - if (rc) - goto out; - - rc = populate_devicetree(ctx); - if (rc) - goto out; - - rc = set_stdout(ctx); - if (rc) - goto out; - - rc = write_devicetree(ctx); - -out: - talloc_free(ctx); - return rc ? EXIT_FAILURE : EXIT_SUCCESS; -}