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firmware: load binary firmware files
When we can't find a .ko module to satisfy the firmware request, try harder by looking for a file to read in directly. We compose this file's name by appending the imagename parameter to the firmware path (currently hard-wired to be /boot/firmware, future plans are for a path). Allow this file to be unloaded when firmware_put() releases the last reference, but we don't need to do the indirection and dance we need to do when unloading the .ko that will unregister the firmware. Sponsored by: Netflix Reviewed by: manu, jhb Differential Revision: https://reviews.freebsd.org/D43555
This commit is contained in:
Warner Losh
parent
23dff4fdba
commit
c7b1e980ae
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@ -29,6 +29,7 @@
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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/eventhandler.h>
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#include <sys/fcntl.h>
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#include <sys/firmware.h>
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#include <sys/kernel.h>
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#include <sys/linker.h>
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@ -36,9 +37,12 @@
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/sbuf.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/taskqueue.h>
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@ -85,8 +89,9 @@ struct priv_fw {
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*/
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struct priv_fw *parent;
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int flags; /* record FIRMWARE_UNLOAD requests */
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#define FW_UNLOAD 0x100
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int flags;
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#define FW_BINARY 0x080 /* Firmware directly loaded, file == NULL */
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#define FW_UNLOAD 0x100 /* record FIRMWARE_UNLOAD requests */
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/*
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* 'file' is private info managed by the autoload/unload code.
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@ -120,7 +125,8 @@ static LIST_HEAD(, priv_fw) firmware_table;
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/*
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* Firmware module operations are handled in a separate task as they
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* might sleep and they require directory context to do i/o.
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* might sleep and they require directory context to do i/o. We also
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* use this when loading binaries directly.
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*/
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static struct taskqueue *firmware_tq;
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static struct task firmware_unload_task;
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@ -133,6 +139,11 @@ MTX_SYSINIT(firmware, &firmware_mtx, "firmware table", MTX_DEF);
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static MALLOC_DEFINE(M_FIRMWARE, "firmware", "device firmware images");
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static uint64_t firmware_max_size = 8u << 20; /* Default to 8MB cap */
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SYSCTL_U64(_debug, OID_AUTO, firmware_max_size,
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CTLFLAG_RWTUN, &firmware_max_size, 0,
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"Max size permitted for a firmware file.");
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/*
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* Helper function to lookup a name.
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* As a side effect, it sets the pointer to a free slot, if any.
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@ -240,6 +251,85 @@ struct fw_loadimage {
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uint32_t flags;
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};
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static const char *fw_path = "/boot/firmware/";
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static void
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try_binary_file(const char *imagename, uint32_t flags)
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{
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struct nameidata nd;
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struct thread *td = curthread;
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struct ucred *cred = td ? td->td_ucred : NULL;
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struct sbuf *sb;
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struct priv_fw *fp;
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const char *fn;
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struct vattr vattr;
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void *data = NULL;
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const struct firmware *fw;
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int flags;
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size_t resid;
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int error;
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bool warn = flags & FIRMWARE_GET_NOWARN;
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/*
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* XXX TODO: Loop over some path instead of a single element path.
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* and fetch this path from the 'firmware_path' kenv the loader sets.
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*/
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sb = sbuf_new_auto();
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sbuf_printf(sb, "%s%s", fw_path, imagename);
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sbuf_finish(sb);
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fn = sbuf_data(sb);
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if (bootverbose)
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printf("Trying to load binary firmware from %s\n", fn);
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, fn);
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flags = FREAD;
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error = vn_open(&nd, &flags, 0, NULL);
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if (error)
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goto err;
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NDFREE_PNBUF(&nd);
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if (nd.ni_vp->v_type != VREG)
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goto err2;
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error = VOP_GETATTR(nd.ni_vp, &vattr, cred);
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if (error)
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goto err2;
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/*
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* Limit this to something sane, 8MB by default.
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*/
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if (vattr.va_size > firmware_max_size) {
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printf("Firmware %s is too big: %ld bytes, %ld bytes max.\n",
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fn, vattr.va_size, firmware_max_size);
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goto err2;
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}
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data = malloc(vattr.va_size, M_FIRMWARE, M_WAITOK);
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error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)data, vattr.va_size, 0,
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UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &resid, td);
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/* XXX make data read only? */
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VOP_UNLOCK(nd.ni_vp);
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vn_close(nd.ni_vp, FREAD, cred, td);
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nd.ni_vp = NULL;
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if (error != 0 || resid != 0)
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goto err;
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fw = firmware_register(fn, data, vattr.va_size, 0, NULL);
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if (fw == NULL)
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goto err;
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fp = PRIV_FW(fw);
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fp->flags |= FW_BINARY;
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if (bootverbose)
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printf("%s: Loaded binary firmware using %s\n", imagename, fn);
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sbuf_delete(sb);
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return;
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err2: /* cleanup in vn_open through vn_close */
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VOP_UNLOCK(nd.ni_vp);
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vn_close(nd.ni_vp, FREAD, cred, td);
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err:
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free(data, M_FIRMWARE);
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if (bootverbose || warn)
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printf("%s: could not load binary firmware %s either\n", imagename, fn);
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sbuf_delete(sb);
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}
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static void
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loadimage(void *arg, int npending __unused)
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{
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@ -253,6 +343,7 @@ loadimage(void *arg, int npending __unused)
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if (bootverbose || (fwli->flags & FIRMWARE_GET_NOWARN) == 0)
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printf("%s: could not load firmware image, error %d\n",
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fwli->imagename, error);
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try_binary_file(fwli->imagename, fwli->flags);
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mtx_lock(&firmware_mtx);
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goto done;
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}
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@ -408,17 +499,32 @@ EVENTHANDLER_DEFINE(mountroot, firmware_mountroot, NULL, 0);
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static void
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unloadentry(void *unused1, int unused2)
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{
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struct priv_fw *fp;
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struct priv_fw *fp, *tmp;
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mtx_lock(&firmware_mtx);
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restart:
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LIST_FOREACH(fp, &firmware_table, link) {
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if (fp->file == NULL || fp->refcnt != 0 ||
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(fp->flags & FW_UNLOAD) == 0)
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LIST_FOREACH_SAFE(fp, &firmware_table, link, tmp) {
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if (((fp->flags & FW_BINARY) == 0 && fp->file == NULL) ||
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fp->refcnt != 0 || (fp->flags & FW_UNLOAD) == 0)
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continue;
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/*
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* Found an entry. Now:
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* If we directly loaded the firmware, then we just need to
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* remove the entry from the list and free the entry and go to
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* the next one. There's no need for the indirection of the kld
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* module case, we free memory and go to the next one.
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*/
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if ((fp->flags & FW_BINARY) != 0) {
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LIST_REMOVE(fp, link);
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free(__DECONST(char *, fp->fw.data), M_FIRMWARE);
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free(__DECONST(char *, fp->fw.name), M_FIRMWARE);
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free(fp, M_FIRMWARE);
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continue;
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}
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/*
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* Found an entry. This is the kld case, so we have a more
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* complex dance. Now:
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* 1. make sure we scan the table again
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* 2. clear FW_UNLOAD so we don't try this entry again.
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* 3. release the lock while trying to unload the module.
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