From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vivek Gautam Subject: [PATCH v6 1/6] base: power: runtime: Export pm_runtime_get/put_suppliers Date: Fri, 19 Jan 2018 17:13:38 +0530 Message-ID: <1516362223-22946-2-git-send-email-vivek.gautam@codeaurora.org> References: <1516362223-22946-1-git-send-email-vivek.gautam@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <1516362223-22946-1-git-send-email-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: freedreno-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Sender: "Freedreno" To: alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, rjw-LthD3rsA81gm4RdzfppkhA@public.gmane.org, robin.murphy-5wv7dgnIgG8@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, freedreno-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org Cc: architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, sricharan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, m.szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org List-Id: linux-arm-msm@vger.kernel.org VGhlIGRldmljZSBsaW5rIGFsbG93cyB0aGUgcG0gZnJhbWV3b3JrIHRvIHRpZSB0aGUgc3VwcGxp ZXIgYW5kCmNvbnN1bWVyLiBTbywgd2hlbmV2ZXIgdGhlIGNvbnN1bWVyIGlzIHBvd2VyZWQtb24g dGhlIHN1cHBsaWVyCmlzIHBvd2VyZWQtb24gZmlyc3QuCgpUaGVyZSBhcmUgaG93ZXZlciBjYXNl cyBpbiB3aGljaCB0aGUgY29uc3VtZXIgd2FudHMgdG8gcG93ZXItb24KdGhlIHN1cHBsaWVyLCBi dXQgbm90IGl0c2VsZi4KRS5nLiwgQSBHcmFwaGljcyBvciBtdWx0aW1lZGlhIGRyaXZlciB3YW50 cyB0byBwb3dlci1vbiB0aGUgU01NVQp0byB1bm1hcCBhIGJ1ZmZlciBhbmQgZmluaXNoIHRoZSBU TEIgb3BlcmF0aW9ucyB3aXRob3V0IHBvd2VyaW5nCm9uIGl0c2VsZi4gU29tZSBvZiB0aGVzZSB1 bm1hcCByZXF1ZXN0cyBhcmUgY29taW5nIGZyb20gdGhlCnVzZXIgc3BhY2Ugd2hlbiB0aGUgY29u dHJvbGxlciBpdHNlbGYgaXMgbm90IHBvd2VyZWQtdXAsIGFuZCBpdApjYW4gYmUgaHVnZSBwZW5h bHR5IGluIHRlcm1zIG9mIHBvd2VyIGFuZCBsYXRlbmN5IHRvIHBvd2VyLXVwCnRoZSBncmFwaGlj cy9tbSBjb250cm9sbGVycy4KVGhlcmUgY2FuIGJlIGFuIGFyZ3VtZW50IHRoYXQgdGhlIHN1cHBs aWVyIHNob3VsZCBoYW5kbGUgdGhpcyBjYXNlCm9uIGl0cyBvd24gYW5kIHRoZXJlIHNob3VsZCBu b3QgYmUgYSBuZWVkIGZvciB0aGUgY29uc3VtZXIgdG8KcG93ZXItb24gdGhlIHN1cHBsaWVyLiBC dXQgYXMgZGlzY3Vzc2VkIG9uIHRoZSB0aHJlYWQgWzFdIGFib3V0CkFSTS1TTU1VIHJ1bnRpbWUg cG0sIHdlIGRvbid0IHdhbnQgdG8gaW50cm9kdWNlIHJ1bnRpbWUgcG0gY2FsbHMKaW4gYXRvbWlj IHBhdGggaW4gYXJtX3NtbXVfdW5tYXAuCgpbMV0gaHR0cHM6Ly9wYXRjaHdvcmsua2VybmVsLm9y Zy9wYXRjaC85ODI3ODI1LwoKU2lnbmVkLW9mZi1ieTogVml2ZWsgR2F1dGFtIDx2aXZlay5nYXV0 YW1AY29kZWF1cm9yYS5vcmc+CkFja2VkLWJ5OiBSYWZhZWwgSi4gV3lzb2NraSA8cmFmYWVsLmou d3lzb2NraUBpbnRlbC5jb20+Ci0tLQogZHJpdmVycy9iYXNlL3Bvd2VyL3J1bnRpbWUuYyB8IDIg KysKIDEgZmlsZSBjaGFuZ2VkLCAyIGluc2VydGlvbnMoKykKCmRpZmYgLS1naXQgYS9kcml2ZXJz L2Jhc2UvcG93ZXIvcnVudGltZS5jIGIvZHJpdmVycy9iYXNlL3Bvd2VyL3J1bnRpbWUuYwppbmRl eCA2ZTg5YjUxZWEzZDkuLjA2YTJhODhmZTg2NiAxMDA2NDQKLS0tIGEvZHJpdmVycy9iYXNlL3Bv d2VyL3J1bnRpbWUuYworKysgYi9kcml2ZXJzL2Jhc2UvcG93ZXIvcnVudGltZS5jCkBAIC0xNTc5 LDYgKzE1NzksNyBAQCB2b2lkIHBtX3J1bnRpbWVfZ2V0X3N1cHBsaWVycyhzdHJ1Y3QgZGV2aWNl ICpkZXYpCiAKIAlkZXZpY2VfbGlua3NfcmVhZF91bmxvY2soaWR4KTsKIH0KK0VYUE9SVF9TWU1C T0xfR1BMKHBtX3J1bnRpbWVfZ2V0X3N1cHBsaWVycyk7CiAKIC8qKgogICogcG1fcnVudGltZV9w dXRfc3VwcGxpZXJzIC0gRHJvcCByZWZlcmVuY2VzIHRvIHN1cHBsaWVyIGRldmljZXMuCkBAIC0x NTk3LDYgKzE1OTgsNyBAQCB2b2lkIHBtX3J1bnRpbWVfcHV0X3N1cHBsaWVycyhzdHJ1Y3QgZGV2 aWNlICpkZXYpCiAKIAlkZXZpY2VfbGlua3NfcmVhZF91bmxvY2soaWR4KTsKIH0KK0VYUE9SVF9T WU1CT0xfR1BMKHBtX3J1bnRpbWVfcHV0X3N1cHBsaWVycyk7CiAKIHZvaWQgcG1fcnVudGltZV9u ZXdfbGluayhzdHJ1Y3QgZGV2aWNlICpkZXYpCiB7Ci0tIApRVUFMQ09NTSBJTkRJQSwgb24gYmVo YWxmIG9mIFF1YWxjb21tIElubm92YXRpb24gQ2VudGVyLCBJbmMuIGlzIGEgbWVtYmVyCm9mIENv ZGUgQXVyb3JhIEZvcnVtLCBob3N0ZWQgYnkgVGhlIExpbnV4IEZvdW5kYXRpb24KCl9fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCkZyZWVkcmVubyBtYWlsaW5n IGxpc3QKRnJlZWRyZW5vQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3RzLmZyZWVk ZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2ZyZWVkcmVubwo= From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: ACJfBosxW4ab6GwyChHWYBm1hGPf9mXSxEglAT6IJoHuQnWCFRmYGXnCdpXS6frCMGDppdRT7AA0 ARC-Seal: i=1; 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mx.google.com; dkim=pass header.i=@codeaurora.org header.s=default header.b=gNWYVjbD; dkim=pass header.i=@codeaurora.org header.s=default header.b=gNWYVjbD; spf=pass (google.com: domain of vivek.gautam@codeaurora.org designates 198.145.29.96 as permitted sender) smtp.mailfrom=vivek.gautam@codeaurora.org Authentication-Results: mx.google.com; dkim=pass header.i=@codeaurora.org header.s=default header.b=gNWYVjbD; dkim=pass header.i=@codeaurora.org header.s=default header.b=gNWYVjbD; spf=pass (google.com: domain of vivek.gautam@codeaurora.org designates 198.145.29.96 as permitted sender) smtp.mailfrom=vivek.gautam@codeaurora.org DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 3AC9B609D1 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=vivek.gautam@codeaurora.org From: Vivek Gautam To: alex.williamson@redhat.com, robh+dt@kernel.org, mark.rutland@arm.com, rjw@rjwysocki.net, robin.murphy@arm.com, will.deacon@arm.com, iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, sboyd@codeaurora.org Cc: gregkh@linuxfoundation.org, sricharan@codeaurora.org, m.szyprowski@samsung.com, architt@codeaurora.org, linux-arm-msm@vger.kernel.org, vivek.gautam@codeaurora.org Subject: [PATCH v6 1/6] base: power: runtime: Export pm_runtime_get/put_suppliers Date: Fri, 19 Jan 2018 17:13:38 +0530 Message-Id: <1516362223-22946-2-git-send-email-vivek.gautam@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1516362223-22946-1-git-send-email-vivek.gautam@codeaurora.org> References: <1516362223-22946-1-git-send-email-vivek.gautam@codeaurora.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590021056059728640?= X-GMAIL-MSGID: =?utf-8?q?1590021056059728640?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: The device link allows the pm framework to tie the supplier and consumer. So, whenever the consumer is powered-on the supplier is powered-on first. There are however cases in which the consumer wants to power-on the supplier, but not itself. E.g., A Graphics or multimedia driver wants to power-on the SMMU to unmap a buffer and finish the TLB operations without powering on itself. Some of these unmap requests are coming from the user space when the controller itself is not powered-up, and it can be huge penalty in terms of power and latency to power-up the graphics/mm controllers. There can be an argument that the supplier should handle this case on its own and there should not be a need for the consumer to power-on the supplier. But as discussed on the thread [1] about ARM-SMMU runtime pm, we don't want to introduce runtime pm calls in atomic path in arm_smmu_unmap. [1] https://patchwork.kernel.org/patch/9827825/ Signed-off-by: Vivek Gautam Acked-by: Rafael J. Wysocki --- drivers/base/power/runtime.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 6e89b51ea3d9..06a2a88fe866 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1579,6 +1579,7 @@ void pm_runtime_get_suppliers(struct device *dev) device_links_read_unlock(idx); } +EXPORT_SYMBOL_GPL(pm_runtime_get_suppliers); /** * pm_runtime_put_suppliers - Drop references to supplier devices. @@ -1597,6 +1598,7 @@ void pm_runtime_put_suppliers(struct device *dev) device_links_read_unlock(idx); } +EXPORT_SYMBOL_GPL(pm_runtime_put_suppliers); void pm_runtime_new_link(struct device *dev) { -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation