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Date: Tue, 19 Apr 2016 18:04:28 -0700 From: Stephen Boyd <stephen.boyd@...aro.org> To: linux-kernel@...r.kernel.org Cc: Vikram Mulukutla <markivx@...eaurora.org>, linux-arm@...ts.infradead.org, Robin Murphy <robin.murphy@....com>, Laura Abbott <labbott@...hat.com>, Arnd Bergmann <arnd@...db.de>, Marek Szyprowski <m.szyprowski@...sung.com>, Mimi Zohar <zohar@...ux.vnet.ibm.com>, Andrew Morton <akpm@...ux-foundation.org>, Mark Brown <broonie@...nel.org>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, Ming Lei <ming.lei@...onical.com> Subject: [RFC/PATCHv2 v2 3/4] firmware_class: Provide infrastructure to make fw caching optional From: Vikram Mulukutla <markivx@...eaurora.org> Some low memory systems with complex peripherals cannot afford to have the relatively large firmware images taking up valuable memory during suspend and resume. Change the internal implementation of firmware_class to disallow caching based on a configurable option. In the near future, variants of request_firmware will take advantage of this feature. Signed-off-by: Vikram Mulukutla <markivx@...eaurora.org> [stephen.boyd@...aro.org: Drop firmware_desc design and use flags] Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org> --- drivers/base/firmware_class.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 773fc3099769..5e6ca3e1c77a 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -112,6 +112,7 @@ static inline long firmware_loading_timeout(void) #define FW_OPT_FALLBACK 0 #endif #define FW_OPT_NO_WARN (1U << 3) +#define FW_OPT_NOCACHE (1U << 4) struct firmware_cache { /* firmware_buf instance will be added into the below list */ @@ -1070,14 +1071,16 @@ static int assign_firmware_buf(struct firmware *fw, struct device *device, * should be fixed in devres or driver core. */ /* don't cache firmware handled without uevent */ - if (device && (opt_flags & FW_OPT_UEVENT)) + if (device && (opt_flags & FW_OPT_UEVENT) && + !(opt_flags & FW_OPT_NOCACHE)) fw_add_devm_name(device, buf->fw_id); /* * After caching firmware image is started, let it piggyback * on request firmware. */ - if (buf->fwc->state == FW_LOADER_START_CACHE) { + if (!(opt_flags & FW_OPT_NOCACHE) && + buf->fwc->state == FW_LOADER_START_CACHE) { if (fw_cache_piggyback_on_request(buf->fw_id)) kref_get(&buf->ref); } -- 2.8.0.rc4
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