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pstore: Split pstore fragile flags
This patch adds new PSTORE_FLAGS for each pstore type so that they can be enabled separately. This is a preparation for ongoing virtio-pstore work to support those types flexibly. The PSTORE_FLAGS_FRAGILE is changed to PSTORE_FLAGS_DMESG to preserve the original behavior. Cc: Anton Vorontsov <anton@enomsg.org> Cc: Colin Cross <ccross@android.com> Cc: Kees Cook <keescook@chromium.org> Cc: Tony Luck <tony.luck@intel.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Len Brown <lenb@kernel.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: linux-acpi@vger.kernel.org Cc: linux-efi@vger.kernel.org Signed-off-by: Namhyung Kim <namhyung@kernel.org> [kees: retained "FRAGILE" for now to make merges easier] Signed-off-by: Kees Cook <keescook@chromium.org>
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@ -938,7 +938,7 @@ static int erst_clearer(enum pstore_type_id type, u64 id, int count,
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static struct pstore_info erst_info = {
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.owner = THIS_MODULE,
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.name = "erst",
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.flags = PSTORE_FLAGS_FRAGILE,
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.flags = PSTORE_FLAGS_DMESG,
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.open = erst_open_pstore,
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.close = erst_close_pstore,
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.read = erst_reader,
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@ -362,7 +362,7 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
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static struct pstore_info efi_pstore_info = {
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.owner = THIS_MODULE,
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.name = "efi",
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.flags = PSTORE_FLAGS_FRAGILE,
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.flags = PSTORE_FLAGS_DMESG,
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.open = efi_pstore_open,
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.close = efi_pstore_close,
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.read = efi_pstore_read,
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@ -659,13 +659,14 @@ int pstore_register(struct pstore_info *psi)
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if (pstore_is_mounted())
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pstore_get_records(0);
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pstore_register_kmsg();
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if ((psi->flags & PSTORE_FLAGS_FRAGILE) == 0) {
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if (psi->flags & PSTORE_FLAGS_DMESG)
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pstore_register_kmsg();
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if (psi->flags & PSTORE_FLAGS_CONSOLE)
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pstore_register_console();
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if (psi->flags & PSTORE_FLAGS_FTRACE)
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pstore_register_ftrace();
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if (psi->flags & PSTORE_FLAGS_PMSG)
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pstore_register_pmsg();
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}
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if (pstore_update_ms >= 0) {
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pstore_timer.expires = jiffies +
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@ -689,12 +690,14 @@ EXPORT_SYMBOL_GPL(pstore_register);
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void pstore_unregister(struct pstore_info *psi)
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{
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if ((psi->flags & PSTORE_FLAGS_FRAGILE) == 0) {
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if (psi->flags & PSTORE_FLAGS_PMSG)
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pstore_unregister_pmsg();
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if (psi->flags & PSTORE_FLAGS_FTRACE)
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pstore_unregister_ftrace();
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if (psi->flags & PSTORE_FLAGS_CONSOLE)
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pstore_unregister_console();
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}
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pstore_unregister_kmsg();
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if (psi->flags & PSTORE_FLAGS_DMESG)
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pstore_unregister_kmsg();
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free_buf_for_compression();
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@ -623,6 +623,8 @@ static int ramoops_probe(struct platform_device *pdev)
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goto fail_clear;
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}
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cxt->pstore.flags = PSTORE_FLAGS_ALL;
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err = pstore_register(&cxt->pstore);
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if (err) {
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pr_err("registering with pstore failed\n");
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@ -74,7 +74,13 @@ struct pstore_info {
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void *data;
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};
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#define PSTORE_FLAGS_FRAGILE 1
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#define PSTORE_FLAGS_DMESG (1 << 0)
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#define PSTORE_FLAGS_FRAGILE PSTORE_FLAGS_DMESG
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#define PSTORE_FLAGS_CONSOLE (1 << 1)
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#define PSTORE_FLAGS_FTRACE (1 << 2)
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#define PSTORE_FLAGS_PMSG (1 << 3)
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#define PSTORE_FLAGS_ALL ((1 << 4) - 1)
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extern int pstore_register(struct pstore_info *);
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extern void pstore_unregister(struct pstore_info *);
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