Re: [PATCH v5 08/13] iommu/rockchip: Control clocks needed to access the IOMMU
From: Robin Murphy
Date: Wed Jan 24 2018 - 08:49:48 EST
On 24/01/18 10:35, Jeffy Chen wrote:
From: Tomasz Figa <tfiga@xxxxxxxxxxxx>
Current code relies on master driver enabling necessary clocks before
IOMMU is accessed, however there are cases when the IOMMU should be
accessed while the master is not running yet, for example allocating
V4L2 videobuf2 buffers, which is done by the VB2 framework using DMA
mapping API and doesn't engage the master driver at all.
This patch fixes the problem by letting clocks needed for IOMMU
operation to be listed in Device Tree and making the driver enable them
for the time of accessing the hardware.
Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
Signed-off-by: Tomasz Figa <tfiga@xxxxxxxxxxxx>
---
Changes in v5:
Use clk_bulk APIs.
Changes in v4: None
Changes in v3: None
Changes in v2: None
.../devicetree/bindings/iommu/rockchip,iommu.txt | 8 +++
drivers/iommu/rockchip-iommu.c | 74 ++++++++++++++++++++--
2 files changed, 76 insertions(+), 6 deletions(-)
diff --git a/Documentation/devicetree/bindings/iommu/rockchip,iommu.txt b/Documentation/devicetree/bindings/iommu/rockchip,iommu.txt
index 2098f7732264..33dd853359fa 100644
--- a/Documentation/devicetree/bindings/iommu/rockchip,iommu.txt
+++ b/Documentation/devicetree/bindings/iommu/rockchip,iommu.txt
@@ -14,6 +14,13 @@ Required properties:
"single-master" device, and needs no additional information
to associate with its master device. See:
Documentation/devicetree/bindings/iommu/iommu.txt
+Optional properties:
+- clocks : A list of master clocks requires for the IOMMU to be accessible
s/requires/required/
+ by the host CPU. The number of clocks depends on the master
+ block and might as well be zero. See [1] for generic clock
Oops, some subtleties of English here :)
To say "the number of clocks ... might as well be zero" effectively
implies "there's no point ever specifying any clocks". I guess what you
really mean here is "...might well be...", i.e. it is both valid and
reasonably likely to require zero clocks.
+ bindings description.
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
Optional properties:
- rockchip,disable-mmu-reset : Don't use the mmu reset operation.
@@ -27,5 +34,6 @@ Example:
reg = <0xff940300 0x100>;
interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "vopl_mmu";
+ clocks = <&cru ACLK_VOP1>, <&cru DCLK_VOP1>, <&cru HCLK_VOP1>;
#iommu-cells = <0>;
};
diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index c4131ca792e0..8a5e2a659b67 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -4,6 +4,7 @@
* published by the Free Software Foundation.
*/
+#include <linux/clk.h>
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/device.h>
@@ -91,6 +92,8 @@ struct rk_iommu {
struct device *dev;
void __iomem **bases;
int num_mmu;
+ struct clk_bulk_data *clocks;
+ int num_clocks;
bool reset_disabled;
struct iommu_device iommu;
struct list_head node; /* entry in rk_iommu_domain.iommus */
@@ -450,6 +453,38 @@ static int rk_iommu_force_reset(struct rk_iommu *iommu)
return 0;
}
+static int rk_iommu_of_get_clocks(struct rk_iommu *iommu)
+{
+ struct device_node *np = iommu->dev->of_node;
+ int ret;
+ int i;
+
+ ret = of_count_phandle_with_args(np, "clocks", "#clock-cells");
+ if (ret == -ENOENT)
+ return 0;
+ else if (ret < 0)
+ return ret;
+
+ iommu->num_clocks = ret;
+ iommu->clocks = devm_kcalloc(iommu->dev, iommu->num_clocks,
+ sizeof(*iommu->clocks), GFP_KERNEL);
+ if (!iommu->clocks)
+ return -ENOMEM;
+
+ for (i = 0; i < iommu->num_clocks; ++i) {
+ iommu->clocks[i].clk = of_clk_get(np, i);
+ if (IS_ERR(iommu->clocks[i].clk)) {
+ ret = PTR_ERR(iommu->clocks[i].clk);
+ goto err_clk_put;
+ }
+ }
Just to confirm my understanding from a quick scan through the code, the
reason we can't use clk_bulk_get() here is that currently, clocks[i].id
being NULL means we'd end up just getting the first clock multiple
times, right?
I guess there could be other users who also want "just get whatever
clocks I have" functionality, so it might be worth proposing that for
the core API as a separate/follow-up patch, but it definitely doesn't
need to be part of this series.
I really don't know enough about correct clk API usage, but modulo the
binding comments it certainly looks nice and tidy now;
Acked-by: Robin Murphy <robin.murphy@xxxxxxx>
Thanks,
Robin.
+
+ return 0;
+err_clk_put:
+ clk_bulk_put(i, iommu->clocks);
+ return ret;
+}
+
static void log_iova(struct rk_iommu *iommu, int index, dma_addr_t iova)
{
void __iomem *base = iommu->bases[index];
@@ -506,6 +541,8 @@ static irqreturn_t rk_iommu_irq(int irq, void *dev_id)
irqreturn_t ret = IRQ_NONE;
int i;
+ WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks));
+
for (i = 0; i < iommu->num_mmu; i++) {
int_status = rk_iommu_read(iommu->bases[i], RK_MMU_INT_STATUS);
if (int_status == 0)
@@ -552,6 +589,8 @@ static irqreturn_t rk_iommu_irq(int irq, void *dev_id)
rk_iommu_write(iommu->bases[i], RK_MMU_INT_CLEAR, int_status);
}
+ clk_bulk_disable(iommu->num_clocks, iommu->clocks);
+
return ret;
}
@@ -594,7 +633,9 @@ static void rk_iommu_zap_iova(struct rk_iommu_domain *rk_domain,
list_for_each(pos, &rk_domain->iommus) {
struct rk_iommu *iommu;
iommu = list_entry(pos, struct rk_iommu, node);
+ WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks));
rk_iommu_zap_lines(iommu, iova, size);
+ clk_bulk_disable(iommu->num_clocks, iommu->clocks);
}
spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
}
@@ -823,10 +864,14 @@ static int rk_iommu_attach_device(struct iommu_domain *domain,
if (!iommu)
return 0;
- ret = rk_iommu_enable_stall(iommu);
+ ret = clk_bulk_enable(iommu->num_clocks, iommu->clocks);
if (ret)
return ret;
+ ret = rk_iommu_enable_stall(iommu);
+ if (ret)
+ goto out_disable_clocks;
+
ret = rk_iommu_force_reset(iommu);
if (ret)
goto out_disable_stall;
@@ -852,6 +897,8 @@ static int rk_iommu_attach_device(struct iommu_domain *domain,
out_disable_stall:
rk_iommu_disable_stall(iommu);
+out_disable_clocks:
+ clk_bulk_disable(iommu->num_clocks, iommu->clocks);
return ret;
}
@@ -873,6 +920,7 @@ static void rk_iommu_detach_device(struct iommu_domain *domain,
spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
/* Ignore error while disabling, just keep going */
+ WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks));
rk_iommu_enable_stall(iommu);
rk_iommu_disable_paging(iommu);
for (i = 0; i < iommu->num_mmu; i++) {
@@ -880,6 +928,7 @@ static void rk_iommu_detach_device(struct iommu_domain *domain,
rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, 0);
}
rk_iommu_disable_stall(iommu);
+ clk_bulk_disable(iommu->num_clocks, iommu->clocks);
iommu->domain = NULL;
@@ -1172,18 +1221,31 @@ static int rk_iommu_probe(struct platform_device *pdev)
iommu->reset_disabled = device_property_read_bool(dev,
"rockchip,disable-mmu-reset");
- err = iommu_device_sysfs_add(&iommu->iommu, dev, NULL, dev_name(dev));
+ err = rk_iommu_of_get_clocks(iommu);
if (err)
return err;
+ err = clk_bulk_prepare(iommu->num_clocks, iommu->clocks);
+ if (err)
+ goto err_put_clocks;
+
+ err = iommu_device_sysfs_add(&iommu->iommu, dev, NULL, dev_name(dev));
+ if (err)
+ goto err_unprepare_clocks;
+
iommu_device_set_ops(&iommu->iommu, &rk_iommu_ops);
err = iommu_device_register(&iommu->iommu);
- if (err) {
- iommu_device_sysfs_remove(&iommu->iommu);
- return err;
- }
+ if (err)
+ goto err_remove_sysfs;
return 0;
+err_remove_sysfs:
+ iommu_device_sysfs_remove(&iommu->iommu);
+err_unprepare_clocks:
+ clk_bulk_unprepare(iommu->num_clocks, iommu->clocks);
+err_put_clocks:
+ clk_bulk_put(iommu->num_clocks, iommu->clocks);
+ return err;
}
static const struct of_device_id rk_iommu_dt_ids[] = {