This patch series consist of five parts and covers the following:
1. Re-enable context caching for Qualcomm SoCs to retain prefetcher
settings during reset and runtime suspend.
2. Remove cfg inside qcom_smmu structure and replace it with single
pointer to qcom_smmu_match_data avoiding replication of multiple
members from same.
3. Introduce intital set of driver changes to implement ACTLR register
for custom prefetcher settings in Qualcomm SoCs.
4. Add ACTLR data and implementation operations for SM8550.
5. Add ACTLR data and implementation operations for SC7280.
Changes in v9 from v8:
Changes to incorporate suggestions from Konrad as follows:
- Re-wrap struct members of actlr_variant in patch 4/5,5/5
in a cleaner way.
- Move actlr_config members to the header.
Link to v8:
https://lore.kernel.org/all/[email protected]/
Changes in v8 from v7:
- Added reviewed-by tags on patch 1/5, 2/5.
Changes to incorporate suggestions from Pavan and Konrad:
- Remove non necessary extra lines.
- Use num_smmu and num_actlrcfg to store the array size and use the
same to traverse the table and save on sentinel space along with
indentation levels.
- Refactor blocks containing qcom_smmu_set_actlr to remove block
repetition in patch 3/5.
- Change copyright year from 2023 to 2022-2023 in patch 3/5.
- Modify qcom_smmu_match_data.actlrvar and actlr_variant.actlrcfg to
const pointer to a const resource.
- use C99 designated initializers and put the address first.
Link to v7:
https://lore.kernel.org/all/[email protected]/
Changes in v7 from v6:
Changes to incorporate suggestions from Dmitry as follows:
- Use io_start address instead of compatible string to identify the
correct instance by comparing with smmu start address and check for
which smmu the corresponding actlr table is to be picked.
Link to v6:
https://lore.kernel.org/all/[email protected]/
Changes in v6 from v5:
- Remove extra Suggested-by tags.
- Add return check for arm_mmu500_reset in 1/5 as discussed.
Link to v5:
https://lore.kernel.org/all/[email protected]/
Changes in v5 from v4:
New addition:
- Modify copyright year in arm-smmu-qcom.h to 2023 from 2022.
Changes to incorporate suggestions from Dmitry as follows:
- Modify the defines for prefetch in (foo << bar) format
as suggested.(FIELD_PREP could not be used in defines
is not inside any block/function)
Changes to incorporate suggestions from Konrad as follows:
- Shift context caching enablement patch as 1/5 instead of 5/5 to
be picked up as independent patch.
- Fix the codestyle to orient variables in reverse xmas tree format
for patch 1/5.
- Fix variable name in patch 1/5 as suggested.
Link to v4:
https://lore.kernel.org/all/[email protected]/
Changes in v4 from v3:
New addition:
- Remove actlrcfg_size and use NULL end element instead to traverse
the actlr table, as this would be a cleaner approach by removing
redundancy of actlrcfg_size.
- Renaming of actlr set function to arm_smmu_qcom based proprietary
convention.
- break from loop once sid is found and ACTLR value is initialized
in qcom_smmu_set_actlr.
- Modify the GFX prefetch value separating into 2 sensible defines.
- Modify comments for prefetch defines as per SMMU-500 TRM.
Changes to incorporate suggestions from Konrad as follows:
- Use Reverse-Christmas-tree sorting wherever applicable.
- Pass arguments directly to arm_smmu_set_actlr instead of creating
duplicate variables.
- Use array indexing instead of direct pointer addressed by new
addition of eliminating actlrcfg_size.
- Switch the HEX value's case from upper to lower case in SC7280
actlrcfg table.
Changes to incorporate suggestions from Dmitry as follows:
- Separate changes not related to ACTLR support to different commit
with patch 5/5.
- Using pointer to struct for arguments in smr_is_subset().
Changes to incorporate suggestions from Bjorn as follows:
- fix the commit message for patch 2/5 to properly document the
value space to avoid confusion.
Fixed build issues reported by kernel test robot [1] for
arm64-allyesconfig [2].
[1]: https://lore.kernel.org/all/[email protected]/
[2]:
https://download.01.org/0day-ci/archive/20231201/[email protected]/config
Link to v3:
https://lore.kernel.org/all/[email protected]/
Changes in v3 from v2:
New addition:
- Include patch 3/4 for adding ACTLR support and data for SC7280.
- Add driver changes for actlr support in gpu smmu.
- Add target wise actlr data and implementation ops for gpu smmu.
Changes to incorporate suggestions from Robin as follows:
- Match the ACTLR values with individual corresponding SID instead
of assuming that any SMR will be programmed to match a superset of
the data.
- Instead of replicating each elements from qcom_smmu_match_data to
qcom_smmu structre during smmu device creation, replace the
replicated members with qcom_smmu_match_data structure inside
qcom_smmu structre and handle the dereference in places that
requires them.
Changes to incorporate suggestions from Dmitry and Konrad as follows:
- Maintain actlr table inside a single structure instead of
nested structure.
- Rename prefetch defines to more appropriately describe their
behavior.
- Remove SM8550 specific implementation ops and roll back to default
qcom_smmu_500_impl implementation ops.
- Add back the removed comments which are NAK.
- Fix commit description for patch 4/4.
Link to v2:
https://lore.kernel.org/all/[email protected]/
Changes in v2 from v1:
- Incorporated suggestions on v1 from Dmitry,Konrad,Pratyush.
- Added defines for ACTLR values.
- Linked sm8550 implementation structure to corresponding
compatible string.
- Repackaged actlr value set implementation to separate function.
- Fixed indentation errors.
- Link to v1:
https://lore.kernel.org/all/[email protected]/
Changes in v1 from RFC:
- Incorporated suggestion form Robin on RFC
- Moved the actlr data table into driver, instead of maintaining
it inside soc specific DT and piggybacking on exisiting iommus
property (iommu = <SID, MASK, ACTLR>) to set this value during
smmu probe.
- Link to RFC:
https://lore.kernel.org/all/[email protected]/
Bibek Kumar Patro (5):
iommu/arm-smmu: re-enable context caching in smmu reset operation
iommu/arm-smmu: refactor qcom_smmu structure to include single pointer
iommu/arm-smmu: introduction of ACTLR for custom prefetcher settings
iommu/arm-smmu: add ACTLR data and support for SM8550
iommu/arm-smmu: add ACTLR data and support for SC7280
.../iommu/arm/arm-smmu/arm-smmu-qcom-debug.c | 2 +-
drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 224 +++++++++++++++++-
drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h | 18 +-
drivers/iommu/arm/arm-smmu/arm-smmu.c | 5 +-
drivers/iommu/arm/arm-smmu/arm-smmu.h | 5 +
5 files changed, 244 insertions(+), 10 deletions(-)
--
2.17.1
Currently in Qualcomm SoCs the default prefetch is set to 1 which allows
the TLB to fetch just the next page table. MMU-500 features ACTLR
register which is implementation defined and is used for Qualcomm SoCs
to have a custom prefetch setting enabling TLB to prefetch the next set
of page tables accordingly allowing for faster translations.
ACTLR value is unique for each SMR (Stream matching register) and stored
in a pre-populated table. This value is set to the register during
context bank initialisation.
Signed-off-by: Bibek Kumar Patro <[email protected]>
---
drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 61 ++++++++++++++++++++++
drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h | 16 +++++-
drivers/iommu/arm/arm-smmu/arm-smmu.c | 5 +-
drivers/iommu/arm/arm-smmu/arm-smmu.h | 5 ++
4 files changed, 84 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index 333daeb18c1c..6004c6d9a7b2 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -215,10 +215,42 @@ static bool qcom_adreno_can_do_ttbr1(struct arm_smmu_device *smmu)
return true;
}
+static void qcom_smmu_set_actlr(struct device *dev, struct arm_smmu_device *smmu, int cbndx,
+ const struct actlr_config *actlrcfg, const size_t num_actlrcfg)
+{
+ struct arm_smmu_master_cfg *cfg = dev_iommu_priv_get(dev);
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+ struct arm_smmu_smr *smr;
+ u16 mask;
+ int idx;
+ u16 id;
+ int i;
+ int j;
+
+ for (i = 0; i < num_actlrcfg; i++) {
+ id = actlrcfg[i].sid;
+ mask = actlrcfg[i].mask;
+
+ for_each_cfg_sme(cfg, fwspec, j, idx) {
+ smr = &smmu->smrs[idx];
+ if (smr_is_subset(smr, id, mask)) {
+ arm_smmu_cb_write(smmu, cbndx, ARM_SMMU_CB_ACTLR,
+ actlrcfg[i].actlr);
+ break;
+ }
+ }
+ }
+}
+
static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain,
struct io_pgtable_cfg *pgtbl_cfg, struct device *dev)
{
+ struct arm_smmu_device *smmu = smmu_domain->smmu;
+ struct qcom_smmu *qsmmu = to_qcom_smmu(smmu);
+ const struct actlr_variant *actlrvar;
+ int cbndx = smmu_domain->cfg.cbndx;
struct adreno_smmu_priv *priv;
+ int i;
smmu_domain->cfg.flush_walk_prefer_tlbiasid = true;
@@ -248,6 +280,18 @@ static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain,
priv->set_stall = qcom_adreno_smmu_set_stall;
priv->resume_translation = qcom_adreno_smmu_resume_translation;
+ actlrvar = qsmmu->data->actlrvar;
+ if (!actlrvar)
+ return 0;
+
+ for (i = 0; i < qsmmu->data->num_smmu ; i++) {
+ if (actlrvar[i].io_start == smmu->ioaddr) {
+ qcom_smmu_set_actlr(dev, smmu, cbndx, actlrvar[i].actlrcfg,
+ actlrvar[i].num_actlrcfg);
+ break;
+ }
+ }
+
return 0;
}
@@ -274,7 +318,24 @@ static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = {
static int qcom_smmu_init_context(struct arm_smmu_domain *smmu_domain,
struct io_pgtable_cfg *pgtbl_cfg, struct device *dev)
{
+ struct arm_smmu_device *smmu = smmu_domain->smmu;
+ struct qcom_smmu *qsmmu = to_qcom_smmu(smmu);
+ const struct actlr_variant *actlrvar;
+ int cbndx = smmu_domain->cfg.cbndx;
+ int i;
+
smmu_domain->cfg.flush_walk_prefer_tlbiasid = true;
+ actlrvar = qsmmu->data->actlrvar;
+ if (!actlrvar)
+ return 0;
+
+ for (i = 0; i < qsmmu->data->num_smmu ; i++) {
+ if (actlrvar[i].io_start == smmu->ioaddr) {
+ qcom_smmu_set_actlr(dev, smmu, cbndx, actlrvar[i].actlrcfg,
+ actlrvar[i].num_actlrcfg);
+ break;
+ }
+ }
return 0;
}
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
index f3b91963e234..3f651242de7c 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
@@ -1,6 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
- * Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2022-2023, Qualcomm Innovation Center, Inc. All rights reserved.
*/
#ifndef _ARM_SMMU_QCOM_H
@@ -24,8 +24,22 @@ struct qcom_smmu_config {
const u32 *reg_offset;
};
+struct actlr_config {
+ u16 sid;
+ u16 mask;
+ u32 actlr;
+};
+
+struct actlr_variant {
+ const resource_size_t io_start;
+ const struct actlr_config * const actlrcfg;
+ const size_t num_actlrcfg;
+};
+
struct qcom_smmu_match_data {
+ const struct actlr_variant * const actlrvar;
const struct qcom_smmu_config *cfg;
+ const size_t num_smmu;
const struct arm_smmu_impl *impl;
const struct arm_smmu_impl *adreno_impl;
};
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index d6d1a2a55cc0..0c7f700b27dd 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -990,9 +990,10 @@ static int arm_smmu_find_sme(struct arm_smmu_device *smmu, u16 id, u16 mask)
* expect simply identical entries for this case, but there's
* no harm in accommodating the generalisation.
*/
- if ((mask & smrs[i].mask) == mask &&
- !((id ^ smrs[i].id) & ~smrs[i].mask))
+
+ if (smr_is_subset(&smrs[i], id, mask))
return i;
+
/*
* If the new entry has any other overlap with an existing one,
* though, then there always exists at least one stream ID
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h
index 703fd5817ec1..2e4f65412c6b 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.h
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h
@@ -501,6 +501,11 @@ static inline void arm_smmu_writeq(struct arm_smmu_device *smmu, int page,
writeq_relaxed(val, arm_smmu_page(smmu, page) + offset);
}
+static inline bool smr_is_subset(struct arm_smmu_smr *smrs, u16 id, u16 mask)
+{
+ return (mask & smrs->mask) == mask && !((id ^ smrs->id) & ~smrs->mask);
+}
+
#define ARM_SMMU_GR0 0
#define ARM_SMMU_GR1 1
#define ARM_SMMU_CB(s, n) ((s)->numpage + (n))
--
2.17.1
Hi,
Are there any additional inputs or suggestions on this patch?
Could you let me know please, incase there are any further concerns.
will try to address them.
Thanks & regards,
Bibek
On 1/23/2024 8:15 PM, Bibek Kumar Patro wrote:
> Currently in Qualcomm SoCs the default prefetch is set to 1 which allows
> the TLB to fetch just the next page table. MMU-500 features ACTLR
> register which is implementation defined and is used for Qualcomm SoCs
> to have a custom prefetch setting enabling TLB to prefetch the next set
> of page tables accordingly allowing for faster translations.
>
> ACTLR value is unique for each SMR (Stream matching register) and stored
> in a pre-populated table. This value is set to the register during
> context bank initialisation.
>
> Signed-off-by: Bibek Kumar Patro <[email protected]>
> ---
> drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 61 ++++++++++++++++++++++
> drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h | 16 +++++-
> drivers/iommu/arm/arm-smmu/arm-smmu.c | 5 +-
> drivers/iommu/arm/arm-smmu/arm-smmu.h | 5 ++
> 4 files changed, 84 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> index 333daeb18c1c..6004c6d9a7b2 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> @@ -215,10 +215,42 @@ static bool qcom_adreno_can_do_ttbr1(struct arm_smmu_device *smmu)
> return true;
> }
>
> +static void qcom_smmu_set_actlr(struct device *dev, struct arm_smmu_device *smmu, int cbndx,
> + const struct actlr_config *actlrcfg, const size_t num_actlrcfg)
> +{
> + struct arm_smmu_master_cfg *cfg = dev_iommu_priv_get(dev);
> + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
> + struct arm_smmu_smr *smr;
> + u16 mask;
> + int idx;
> + u16 id;
> + int i;
> + int j;
> +
> + for (i = 0; i < num_actlrcfg; i++) {
> + id = actlrcfg[i].sid;
> + mask = actlrcfg[i].mask;
> +
> + for_each_cfg_sme(cfg, fwspec, j, idx) {
> + smr = &smmu->smrs[idx];
> + if (smr_is_subset(smr, id, mask)) {
> + arm_smmu_cb_write(smmu, cbndx, ARM_SMMU_CB_ACTLR,
> + actlrcfg[i].actlr);
> + break;
> + }
> + }
> + }
> +}
> +
> static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain,
> struct io_pgtable_cfg *pgtbl_cfg, struct device *dev)
> {
> + struct arm_smmu_device *smmu = smmu_domain->smmu;
> + struct qcom_smmu *qsmmu = to_qcom_smmu(smmu);
> + const struct actlr_variant *actlrvar;
> + int cbndx = smmu_domain->cfg.cbndx;
> struct adreno_smmu_priv *priv;
> + int i;
>
> smmu_domain->cfg.flush_walk_prefer_tlbiasid = true;
>
> @@ -248,6 +280,18 @@ static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain,
> priv->set_stall = qcom_adreno_smmu_set_stall;
> priv->resume_translation = qcom_adreno_smmu_resume_translation;
>
> + actlrvar = qsmmu->data->actlrvar;
> + if (!actlrvar)
> + return 0;
> +
> + for (i = 0; i < qsmmu->data->num_smmu ; i++) {
> + if (actlrvar[i].io_start == smmu->ioaddr) {
> + qcom_smmu_set_actlr(dev, smmu, cbndx, actlrvar[i].actlrcfg,
> + actlrvar[i].num_actlrcfg);
> + break;
> + }
> + }
> +
> return 0;
> }
>
> @@ -274,7 +318,24 @@ static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = {
> static int qcom_smmu_init_context(struct arm_smmu_domain *smmu_domain,
> struct io_pgtable_cfg *pgtbl_cfg, struct device *dev)
> {
> + struct arm_smmu_device *smmu = smmu_domain->smmu;
> + struct qcom_smmu *qsmmu = to_qcom_smmu(smmu);
> + const struct actlr_variant *actlrvar;
> + int cbndx = smmu_domain->cfg.cbndx;
> + int i;
> +
> smmu_domain->cfg.flush_walk_prefer_tlbiasid = true;
> + actlrvar = qsmmu->data->actlrvar;
> + if (!actlrvar)
> + return 0;
> +
> + for (i = 0; i < qsmmu->data->num_smmu ; i++) {
> + if (actlrvar[i].io_start == smmu->ioaddr) {
> + qcom_smmu_set_actlr(dev, smmu, cbndx, actlrvar[i].actlrcfg,
> + actlrvar[i].num_actlrcfg);
> + break;
> + }
> + }
>
> return 0;
> }
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
> index f3b91963e234..3f651242de7c 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
> @@ -1,6 +1,6 @@
> /* SPDX-License-Identifier: GPL-2.0-only */
> /*
> - * Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
> + * Copyright (c) 2022-2023, Qualcomm Innovation Center, Inc. All rights reserved.
> */
>
> #ifndef _ARM_SMMU_QCOM_H
> @@ -24,8 +24,22 @@ struct qcom_smmu_config {
> const u32 *reg_offset;
> };
>
> +struct actlr_config {
> + u16 sid;
> + u16 mask;
> + u32 actlr;
> +};
> +
> +struct actlr_variant {
> + const resource_size_t io_start;
> + const struct actlr_config * const actlrcfg;
> + const size_t num_actlrcfg;
> +};
> +
> struct qcom_smmu_match_data {
> + const struct actlr_variant * const actlrvar;
> const struct qcom_smmu_config *cfg;
> + const size_t num_smmu;
> const struct arm_smmu_impl *impl;
> const struct arm_smmu_impl *adreno_impl;
> };
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> index d6d1a2a55cc0..0c7f700b27dd 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> @@ -990,9 +990,10 @@ static int arm_smmu_find_sme(struct arm_smmu_device *smmu, u16 id, u16 mask)
> * expect simply identical entries for this case, but there's
> * no harm in accommodating the generalisation.
> */
> - if ((mask & smrs[i].mask) == mask &&
> - !((id ^ smrs[i].id) & ~smrs[i].mask))
> +
> + if (smr_is_subset(&smrs[i], id, mask))
> return i;
> +
> /*
> * If the new entry has any other overlap with an existing one,
> * though, then there always exists at least one stream ID
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h
> index 703fd5817ec1..2e4f65412c6b 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.h
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h
> @@ -501,6 +501,11 @@ static inline void arm_smmu_writeq(struct arm_smmu_device *smmu, int page,
> writeq_relaxed(val, arm_smmu_page(smmu, page) + offset);
> }
>
> +static inline bool smr_is_subset(struct arm_smmu_smr *smrs, u16 id, u16 mask)
> +{
> + return (mask & smrs->mask) == mask && !((id ^ smrs->id) & ~smrs->mask);
> +}
> +
> #define ARM_SMMU_GR0 0
> #define ARM_SMMU_GR1 1
> #define ARM_SMMU_CB(s, n) ((s)->numpage + (n))
> --
> 2.17.1
>
On Tue, 23 Jan 2024 at 16:46, Bibek Kumar Patro
<[email protected]> wrote:
>
> Currently in Qualcomm SoCs the default prefetch is set to 1 which allows
> the TLB to fetch just the next page table. MMU-500 features ACTLR
> register which is implementation defined and is used for Qualcomm SoCs
> to have a custom prefetch setting enabling TLB to prefetch the next set
> of page tables accordingly allowing for faster translations.
>
> ACTLR value is unique for each SMR (Stream matching register) and stored
> in a pre-populated table. This value is set to the register during
> context bank initialisation.
>
> Signed-off-by: Bibek Kumar Patro <[email protected]>
> ---
> drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 61 ++++++++++++++++++++++
> drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h | 16 +++++-
> drivers/iommu/arm/arm-smmu/arm-smmu.c | 5 +-
> drivers/iommu/arm/arm-smmu/arm-smmu.h | 5 ++
> 4 files changed, 84 insertions(+), 3 deletions(-)
Reviewed-by: Dmitry Baryshkov <[email protected]>
--
With best wishes
Dmitry
On Tue, 23 Jan 2024 at 16:46, Bibek Kumar Patro
<[email protected]> wrote:
>
> This patch series consist of five parts and covers the following:
>
> 1. Re-enable context caching for Qualcomm SoCs to retain prefetcher
> settings during reset and runtime suspend.
>
> 2. Remove cfg inside qcom_smmu structure and replace it with single
> pointer to qcom_smmu_match_data avoiding replication of multiple
> members from same.
>
> 3. Introduce intital set of driver changes to implement ACTLR register
> for custom prefetcher settings in Qualcomm SoCs.
>
> 4. Add ACTLR data and implementation operations for SM8550.
>
> 5. Add ACTLR data and implementation operations for SC7280.
Colleagues, just wanted to check, what happened to this series?
--
With best wishes
Dmitry
On Tue, Jan 23, 2024 at 7:00 AM Bibek Kumar Patro
<[email protected]> wrote:
>
> Currently in Qualcomm SoCs the default prefetch is set to 1 which allows
> the TLB to fetch just the next page table. MMU-500 features ACTLR
> register which is implementation defined and is used for Qualcomm SoCs
> to have a custom prefetch setting enabling TLB to prefetch the next set
> of page tables accordingly allowing for faster translations.
>
> ACTLR value is unique for each SMR (Stream matching register) and stored
> in a pre-populated table. This value is set to the register during
> context bank initialisation.
>
> Signed-off-by: Bibek Kumar Patro <[email protected]>
> ---
> drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 61 ++++++++++++++++++++++
> drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h | 16 +++++-
> drivers/iommu/arm/arm-smmu/arm-smmu.c | 5 +-
> drivers/iommu/arm/arm-smmu/arm-smmu.h | 5 ++
> 4 files changed, 84 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> index 333daeb18c1c..6004c6d9a7b2 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> @@ -215,10 +215,42 @@ static bool qcom_adreno_can_do_ttbr1(struct arm_smmu_device *smmu)
> return true;
> }
>
> +static void qcom_smmu_set_actlr(struct device *dev, struct arm_smmu_device *smmu, int cbndx,
> + const struct actlr_config *actlrcfg, const size_t num_actlrcfg)
> +{
> + struct arm_smmu_master_cfg *cfg = dev_iommu_priv_get(dev);
> + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
> + struct arm_smmu_smr *smr;
> + u16 mask;
> + int idx;
> + u16 id;
> + int i;
> + int j;
> +
> + for (i = 0; i < num_actlrcfg; i++) {
> + id = actlrcfg[i].sid;
> + mask = actlrcfg[i].mask;
> +
> + for_each_cfg_sme(cfg, fwspec, j, idx) {
> + smr = &smmu->smrs[idx];
> + if (smr_is_subset(smr, id, mask)) {
> + arm_smmu_cb_write(smmu, cbndx, ARM_SMMU_CB_ACTLR,
> + actlrcfg[i].actlr);
So, this makes ACTLR look like kind of a FIFO. But I'm looking at
downstream kgsl's PRR thing (which we'll need to implement vulkan
sparse residency), and it appears to be wanting to set BIT(5) in ACTLR
to enable PRR.
val = KGSL_IOMMU_GET_CTX_REG(ctx, KGSL_IOMMU_CTX_ACTLR);
val |= FIELD_PREP(KGSL_IOMMU_ACTLR_PRR_ENABLE, 1);
KGSL_IOMMU_SET_CTX_REG(ctx, KGSL_IOMMU_CTX_ACTLR, val);
Any idea how this works? And does it need to be done before or after
the ACTLR programming done in this patch?
BR,
-R
> + break;
> + }
> + }
> + }
> +}
> +
> static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain,
> struct io_pgtable_cfg *pgtbl_cfg, struct device *dev)
> {
> + struct arm_smmu_device *smmu = smmu_domain->smmu;
> + struct qcom_smmu *qsmmu = to_qcom_smmu(smmu);
> + const struct actlr_variant *actlrvar;
> + int cbndx = smmu_domain->cfg.cbndx;
> struct adreno_smmu_priv *priv;
> + int i;
>
> smmu_domain->cfg.flush_walk_prefer_tlbiasid = true;
>
> @@ -248,6 +280,18 @@ static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain,
> priv->set_stall = qcom_adreno_smmu_set_stall;
> priv->resume_translation = qcom_adreno_smmu_resume_translation;
>
> + actlrvar = qsmmu->data->actlrvar;
> + if (!actlrvar)
> + return 0;
> +
> + for (i = 0; i < qsmmu->data->num_smmu ; i++) {
> + if (actlrvar[i].io_start == smmu->ioaddr) {
> + qcom_smmu_set_actlr(dev, smmu, cbndx, actlrvar[i]actlrcfg,
> + actlrvar[i].num_actlrcfg);
> + break;
> + }
> + }
> +
> return 0;
> }
>
> @@ -274,7 +318,24 @@ static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = {
> static int qcom_smmu_init_context(struct arm_smmu_domain *smmu_domain,
> struct io_pgtable_cfg *pgtbl_cfg, struct device *dev)
> {
> + struct arm_smmu_device *smmu = smmu_domain->smmu;
> + struct qcom_smmu *qsmmu = to_qcom_smmu(smmu);
> + const struct actlr_variant *actlrvar;
> + int cbndx = smmu_domain->cfg.cbndx;
> + int i;
> +
> smmu_domain->cfg.flush_walk_prefer_tlbiasid = true;
> + actlrvar = qsmmu->data->actlrvar;
> + if (!actlrvar)
> + return 0;
> +
> + for (i = 0; i < qsmmu->data->num_smmu ; i++) {
> + if (actlrvar[i].io_start == smmu->ioaddr) {
> + qcom_smmu_set_actlr(dev, smmu, cbndx, actlrvar[i]actlrcfg,
> + actlrvar[i].num_actlrcfg);
> + break;
> + }
> + }
>
> return 0;
> }
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
> index f3b91963e234..3f651242de7c 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h
> @@ -1,6 +1,6 @@
> /* SPDX-License-Identifier: GPL-2.0-only */
> /*
> - * Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
> + * Copyright (c) 2022-2023, Qualcomm Innovation Center, Inc. All rights reserved.
> */
>
> #ifndef _ARM_SMMU_QCOM_H
> @@ -24,8 +24,22 @@ struct qcom_smmu_config {
> const u32 *reg_offset;
> };
>
> +struct actlr_config {
> + u16 sid;
> + u16 mask;
> + u32 actlr;
> +};
> +
> +struct actlr_variant {
> + const resource_size_t io_start;
> + const struct actlr_config * const actlrcfg;
> + const size_t num_actlrcfg;
> +};
> +
> struct qcom_smmu_match_data {
> + const struct actlr_variant * const actlrvar;
> const struct qcom_smmu_config *cfg;
> + const size_t num_smmu;
> const struct arm_smmu_impl *impl;
> const struct arm_smmu_impl *adreno_impl;
> };
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> index d6d1a2a55cc0..0c7f700b27dd 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> @@ -990,9 +990,10 @@ static int arm_smmu_find_sme(struct arm_smmu_device *smmu, u16 id, u16 mask)
> * expect simply identical entries for this case, but there's
> * no harm in accommodating the generalisation.
> */
> - if ((mask & smrs[i].mask) == mask &&
> - !((id ^ smrs[i].id) & ~smrs[i].mask))
> +
> + if (smr_is_subset(&smrs[i], id, mask))
> return i;
> +
> /*
> * If the new entry has any other overlap with an existing one,
> * though, then there always exists at least one stream ID
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h
> index 703fd5817ec1..2e4f65412c6b 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.h
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h
> @@ -501,6 +501,11 @@ static inline void arm_smmu_writeq(struct arm_smmu_device *smmu, int page,
> writeq_relaxed(val, arm_smmu_page(smmu, page) + offset);
> }
>
> +static inline bool smr_is_subset(struct arm_smmu_smr *smrs, u16 id, u16 mask)
> +{
> + return (mask & smrs->mask) == mask && !((id ^ smrs->id) & ~smrs->mask);
> +}
> +
> #define ARM_SMMU_GR0 0
> #define ARM_SMMU_GR1 1
> #define ARM_SMMU_CB(s, n) ((s)->numpage + (n))
> --
> 2.17.1
>
>