From: Ulf Hansson <ulf.hansson@linaro.org> To: "Rafael J . Wysocki" <rjw@rjwysocki.net>, Sudeep Holla <sudeep.holla@arm.com>, Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>, Mark Rutland <mark.rutland@arm.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org>, Lina Iyer <ilina@codeaurora.org>, Ulf Hansson <ulf.hansson@linaro.org>, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/7] drivers: firmware: psci: Simplify state node parsing Date: Thu, 28 Feb 2019 14:59:17 +0100 [thread overview] Message-ID: <20190228135919.3747-6-ulf.hansson@linaro.org> (raw) In-Reply-To: <20190228135919.3747-1-ulf.hansson@linaro.org> Instead of iterating through all the state nodes in DT, to find out how many states that needs to be allocated, let's use the number already known by the cpuidle driver. In this way we can drop the iteration altogether. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> --- drivers/firmware/psci/psci.c | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-) diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c index d50b46a0528f..cbfc936d251c 100644 --- a/drivers/firmware/psci/psci.c +++ b/drivers/firmware/psci/psci.c @@ -290,26 +290,20 @@ static int psci_dt_parse_state_node(struct device_node *np, u32 *state) static int psci_dt_cpu_init_idle(struct cpuidle_driver *drv, struct device_node *cpu_node, int cpu) { - int i, ret = 0, count = 0; + int i, ret = 0, num_state_nodes = drv->state_count - 1; u32 *psci_states; struct device_node *state_node; - /* Count idle states */ - while ((state_node = of_parse_phandle(cpu_node, "cpu-idle-states", - count))) { - count++; - of_node_put(state_node); - } - - if (!count) - return -ENODEV; - - psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL); + psci_states = kcalloc(num_state_nodes, sizeof(*psci_states), + GFP_KERNEL); if (!psci_states) return -ENOMEM; - for (i = 0; i < count; i++) { + for (i = 0; i < num_state_nodes; i++) { state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i); + if (!state_node) + break; + ret = psci_dt_parse_state_node(state_node, &psci_states[i]); of_node_put(state_node); @@ -319,6 +313,11 @@ static int psci_dt_cpu_init_idle(struct cpuidle_driver *drv, pr_debug("psci-power-state %#x index %d\n", psci_states[i], i); } + if (i != num_state_nodes) { + ret = -ENODEV; + goto free_mem; + } + /* Idle states parsed correctly, initialize per-cpu pointer */ per_cpu(psci_power_state, cpu) = psci_states; return 0; -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Ulf Hansson <ulf.hansson@linaro.org> To: "Rafael J . Wysocki" <rjw@rjwysocki.net>, Sudeep Holla <sudeep.holla@arm.com>, Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>, Mark Rutland <mark.rutland@arm.com> Cc: Ulf Hansson <ulf.hansson@linaro.org>, linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org, Daniel Lezcano <daniel.lezcano@linaro.org>, linux-kernel@vger.kernel.org, Lina Iyer <ilina@codeaurora.org>, linux-arm-kernel@lists.infradead.org Subject: [PATCH 5/7] drivers: firmware: psci: Simplify state node parsing Date: Thu, 28 Feb 2019 14:59:17 +0100 [thread overview] Message-ID: <20190228135919.3747-6-ulf.hansson@linaro.org> (raw) In-Reply-To: <20190228135919.3747-1-ulf.hansson@linaro.org> Instead of iterating through all the state nodes in DT, to find out how many states that needs to be allocated, let's use the number already known by the cpuidle driver. In this way we can drop the iteration altogether. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> --- drivers/firmware/psci/psci.c | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-) diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c index d50b46a0528f..cbfc936d251c 100644 --- a/drivers/firmware/psci/psci.c +++ b/drivers/firmware/psci/psci.c @@ -290,26 +290,20 @@ static int psci_dt_parse_state_node(struct device_node *np, u32 *state) static int psci_dt_cpu_init_idle(struct cpuidle_driver *drv, struct device_node *cpu_node, int cpu) { - int i, ret = 0, count = 0; + int i, ret = 0, num_state_nodes = drv->state_count - 1; u32 *psci_states; struct device_node *state_node; - /* Count idle states */ - while ((state_node = of_parse_phandle(cpu_node, "cpu-idle-states", - count))) { - count++; - of_node_put(state_node); - } - - if (!count) - return -ENODEV; - - psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL); + psci_states = kcalloc(num_state_nodes, sizeof(*psci_states), + GFP_KERNEL); if (!psci_states) return -ENOMEM; - for (i = 0; i < count; i++) { + for (i = 0; i < num_state_nodes; i++) { state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i); + if (!state_node) + break; + ret = psci_dt_parse_state_node(state_node, &psci_states[i]); of_node_put(state_node); @@ -319,6 +313,11 @@ static int psci_dt_cpu_init_idle(struct cpuidle_driver *drv, pr_debug("psci-power-state %#x index %d\n", psci_states[i], i); } + if (i != num_state_nodes) { + ret = -ENODEV; + goto free_mem; + } + /* Idle states parsed correctly, initialize per-cpu pointer */ per_cpu(psci_power_state, cpu) = psci_states; return 0; -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-02-28 13:59 UTC|newest] Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-02-28 13:59 [PATCH 0/7] drivers: firmware: psci: Some cleanup and refactoring Ulf Hansson 2019-02-28 13:59 ` Ulf Hansson 2019-02-28 13:59 ` [PATCH 1/7] drivers: firmware: psci: Move psci to separate directory Ulf Hansson 2019-02-28 13:59 ` Ulf Hansson 2019-02-28 13:59 ` Ulf Hansson 2019-02-28 14:34 ` Daniel Lezcano 2019-02-28 14:34 ` Daniel Lezcano 2019-03-01 17:03 ` Mark Rutland 2019-03-01 17:03 ` Mark Rutland 2019-02-28 13:59 ` [PATCH 2/7] MAINTAINERS: Update files for PSCI Ulf Hansson 2019-02-28 13:59 ` Ulf Hansson 2019-02-28 14:35 ` Daniel Lezcano 2019-02-28 14:35 ` Daniel Lezcano 2019-03-01 17:04 ` Mark Rutland 2019-03-01 17:04 ` Mark Rutland 2019-02-28 13:59 ` [PATCH 3/7] drivers: firmware: psci: Split psci_dt_cpu_init_idle() Ulf Hansson 2019-02-28 13:59 ` Ulf Hansson 2019-02-28 14:42 ` Daniel Lezcano 2019-02-28 14:42 ` Daniel Lezcano 2019-02-28 22:13 ` Ulf Hansson 2019-02-28 22:13 ` Ulf Hansson 2019-03-01 17:07 ` Mark Rutland 2019-03-01 17:07 ` Mark Rutland 2019-02-28 13:59 ` [PATCH 4/7] ARM/ARM64: cpuidle: Let back-end init ops take the driver as input Ulf Hansson 2019-02-28 13:59 ` Ulf Hansson 2019-02-28 15:30 ` Daniel Lezcano 2019-02-28 15:30 ` Daniel Lezcano 2019-03-01 17:31 ` Mark Rutland 2019-03-01 17:31 ` Mark Rutland 2019-02-28 13:59 ` Ulf Hansson [this message] 2019-02-28 13:59 ` [PATCH 5/7] drivers: firmware: psci: Simplify state node parsing Ulf Hansson 2019-02-28 15:40 ` Daniel Lezcano 2019-02-28 15:40 ` Daniel Lezcano 2019-02-28 22:26 ` Ulf Hansson 2019-02-28 22:26 ` Ulf Hansson 2019-02-28 22:41 ` Daniel Lezcano 2019-02-28 22:41 ` Daniel Lezcano 2019-03-01 17:28 ` Mark Rutland 2019-03-01 17:28 ` Mark Rutland 2019-03-04 10:14 ` Ulf Hansson 2019-03-04 10:14 ` Ulf Hansson 2019-03-06 18:15 ` Lorenzo Pieralisi 2019-03-06 18:15 ` Lorenzo Pieralisi 2019-03-08 10:36 ` Ulf Hansson 2019-03-08 10:36 ` Ulf Hansson 2019-03-08 11:49 ` Lorenzo Pieralisi 2019-03-08 11:49 ` Lorenzo Pieralisi 2019-03-08 13:07 ` Ulf Hansson 2019-03-08 13:07 ` Ulf Hansson 2019-03-08 13:17 ` Lorenzo Pieralisi 2019-03-08 13:17 ` Lorenzo Pieralisi 2019-03-08 13:23 ` Ulf Hansson 2019-03-08 13:23 ` Ulf Hansson 2019-03-08 13:31 ` Lorenzo Pieralisi 2019-03-08 13:31 ` Lorenzo Pieralisi 2019-03-08 13:43 ` Ulf Hansson 2019-03-08 13:43 ` Ulf Hansson 2019-02-28 13:59 ` [PATCH 6/7] drivers: firmware: psci: Simplify error path of psci_dt_init() Ulf Hansson 2019-02-28 13:59 ` Ulf Hansson 2019-02-28 13:59 ` [PATCH 7/7] drivers: firmware: psci: Announce support for OS initiated suspend mode Ulf Hansson 2019-02-28 13:59 ` Ulf Hansson 2019-03-01 17:28 ` Stephen Boyd 2019-03-01 17:28 ` Stephen Boyd 2019-03-01 17:28 ` Stephen Boyd 2019-03-04 10:25 ` Ulf Hansson 2019-03-04 10:25 ` Ulf Hansson 2019-03-01 17:32 ` Mark Rutland 2019-03-01 17:32 ` Mark Rutland
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