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memory: tegra: Implement SID override programming

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Instead of programming all SID overrides during early boot, perform the
operation on-demand after the SMMU translations have been set up for a
device. This reuses data from device tree to match memory clients for a
device and programs the SID specified in device tree, which corresponds
to the SID used for the SMMU context banks for the device.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20210603164632.1000458-2-thierry.reding@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
This commit is contained in:
Thierry Reding 2021-06-03 18:46:24 +02:00 committed by Krzysztof Kozlowski
parent 8fd9f632ba
commit 393d66fd2c
3 changed files with 84 additions and 0 deletions
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9
drivers/memory/tegra/mc.c
View File

@ -97,6 +97,15 @@ struct tegra_mc *devm_tegra_memory_controller_get(struct device *dev)
}
EXPORT_SYMBOL_GPL(devm_tegra_memory_controller_get);
int tegra_mc_probe_device(struct tegra_mc *mc, struct device *dev)
{
if (mc->soc->ops && mc->soc->ops->probe_device)
return mc->soc->ops->probe_device(mc, dev);
return 0;
}
EXPORT_SYMBOL_GPL(tegra_mc_probe_device);
static int tegra_mc_block_dma_common(struct tegra_mc *mc,
const struct tegra_mc_reset *rst)
{

72
drivers/memory/tegra/tegra186.c
View File

@ -4,6 +4,7 @@
*/
#include <linux/io.h>
#include <linux/iommu.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/of_device.h>
@ -15,6 +16,10 @@
#include <dt-bindings/memory/tegra186-mc.h>
#endif
#define MC_SID_STREAMID_OVERRIDE_MASK GENMASK(7, 0)
#define MC_SID_STREAMID_SECURITY_WRITE_ACCESS_DISABLED BIT(16)
#define MC_SID_STREAMID_SECURITY_OVERRIDE BIT(8)
static void tegra186_mc_program_sid(struct tegra_mc *mc)
{
unsigned int i;
@ -66,10 +71,77 @@ static int tegra186_mc_resume(struct tegra_mc *mc)
return 0;
}
static void tegra186_mc_client_sid_override(struct tegra_mc *mc,
const struct tegra_mc_client *client,
unsigned int sid)
{
u32 value, old;
value = readl(mc->regs + client->regs.sid.security);
if ((value & MC_SID_STREAMID_SECURITY_OVERRIDE) == 0) {
/*
* If the secure firmware has locked this down the override
* for this memory client, there's nothing we can do here.
*/
if (value & MC_SID_STREAMID_SECURITY_WRITE_ACCESS_DISABLED)
return;
/*
* Otherwise, try to set the override itself. Typically the
* secure firmware will never have set this configuration.
* Instead, it will either have disabled write access to
* this field, or it will already have set an explicit
* override itself.
*/
WARN_ON((value & MC_SID_STREAMID_SECURITY_OVERRIDE) == 0);
value |= MC_SID_STREAMID_SECURITY_OVERRIDE;
writel(value, mc->regs + client->regs.sid.security);
}
value = readl(mc->regs + client->regs.sid.override);
old = value & MC_SID_STREAMID_OVERRIDE_MASK;
if (old != sid) {
dev_dbg(mc->dev, "overriding SID %x for %s with %x\n", old,
client->name, sid);
writel(sid, mc->regs + client->regs.sid.override);
}
}
static int tegra186_mc_probe_device(struct tegra_mc *mc, struct device *dev)
{
#if IS_ENABLED(CONFIG_IOMMU_API)
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct of_phandle_args args;
unsigned int i, index = 0;
while (!of_parse_phandle_with_args(dev->of_node, "interconnects", "#interconnect-cells",
index, &args)) {
if (args.np == mc->dev->of_node && args.args_count != 0) {
for (i = 0; i < mc->soc->num_clients; i++) {
const struct tegra_mc_client *client = &mc->soc->clients[i];
if (client->id == args.args[0]) {
u32 sid = fwspec->ids[0] & MC_SID_STREAMID_OVERRIDE_MASK;
tegra186_mc_client_sid_override(mc, client, sid);
}
}
}
index++;
}
#endif
return 0;
}
const struct tegra_mc_ops tegra186_mc_ops = {
.probe = tegra186_mc_probe,
.remove = tegra186_mc_remove,
.resume = tegra186_mc_resume,
.probe_device = tegra186_mc_probe_device,
};
#if defined(CONFIG_ARCH_TEGRA_186_SOC)

3
include/soc/tegra/mc.h
View File

@ -180,6 +180,7 @@ struct tegra_mc_ops {
int (*suspend)(struct tegra_mc *mc);
int (*resume)(struct tegra_mc *mc);
irqreturn_t (*handle_irq)(int irq, void *data);
int (*probe_device)(struct tegra_mc *mc, struct device *dev);
};
struct tegra_mc_soc {
@ -244,4 +245,6 @@ devm_tegra_memory_controller_get(struct device *dev)
}
#endif
int tegra_mc_probe_device(struct tegra_mc *mc, struct device *dev);
#endif /* __SOC_TEGRA_MC_H__ */