[tip:perf/core] x86/events, drivers/amd/iommu: Prepare for multiple IOMMUs support

From: tip-bot for Suravee Suthikulpanit
Date: Thu Mar 30 2017 - 04:43:32 EST

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Commit-ID: 1650dfd1a9bcde8fcfaab776887bb6f4e91830c3
Gitweb: http://git.kernel.org/tip/1650dfd1a9bcde8fcfaab776887bb6f4e91830c3
Author: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
AuthorDate: Fri, 24 Feb 2017 02:48:19 -0600
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 30 Mar 2017 09:53:55 +0200

x86/events, drivers/amd/iommu: Prepare for multiple IOMMUs support

Currently, amd_iommu_pc_get_set_reg_val() cannot support multiple
IOMMUs. Modify it to allow callers to specify an IOMMU. This is in
preparation for supporting multiple IOMMUs.

Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: JÃrg RÃdel <joro@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vince Weaver <vincent.weaver@xxxxxxxxx>
Cc: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1487926102-13073-8-git-send-email-Suravee.Suthikulpanit@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/events/amd/iommu.c | 38 ++++++++++++++++--------------------
arch/x86/events/amd/iommu.h | 9 +++++++--
drivers/iommu/amd_iommu_init.c | 43 +++++++++++++++++++++++------------------
drivers/iommu/amd_iommu_proto.h | 5 -----
4 files changed, 48 insertions(+), 47 deletions(-)

diff --git a/arch/x86/events/amd/iommu.c b/arch/x86/events/amd/iommu.c
index 10f67d3..88fbc80 100644
--- a/arch/x86/events/amd/iommu.c
+++ b/arch/x86/events/amd/iommu.c
@@ -248,49 +248,45 @@ static int perf_iommu_event_init(struct perf_event *event)

static void perf_iommu_enable_event(struct perf_event *ev)
{
+ struct amd_iommu *iommu = get_amd_iommu(0);
u8 csource = _GET_CSOURCE(ev);
u16 devid = _GET_DEVID(ev);
+ u8 bank = _GET_BANK(ev);
+ u8 cntr = _GET_CNTR(ev);
u64 reg = 0ULL;

reg = csource;
- amd_iommu_pc_get_set_reg_val(devid,
- _GET_BANK(ev), _GET_CNTR(ev) ,
- IOMMU_PC_COUNTER_SRC_REG, &reg, true);
+ amd_iommu_pc_set_reg(iommu, bank, cntr, IOMMU_PC_COUNTER_SRC_REG, &reg);

reg = devid | (_GET_DEVID_MASK(ev) << 32);
if (reg)
reg |= BIT(31);
- amd_iommu_pc_get_set_reg_val(devid,
- _GET_BANK(ev), _GET_CNTR(ev) ,
- IOMMU_PC_DEVID_MATCH_REG, &reg, true);
+ amd_iommu_pc_set_reg(iommu, bank, cntr, IOMMU_PC_DEVID_MATCH_REG, &reg);

reg = _GET_PASID(ev) | (_GET_PASID_MASK(ev) << 32);
if (reg)
reg |= BIT(31);
- amd_iommu_pc_get_set_reg_val(devid,
- _GET_BANK(ev), _GET_CNTR(ev) ,
- IOMMU_PC_PASID_MATCH_REG, &reg, true);
+ amd_iommu_pc_set_reg(iommu, bank, cntr, IOMMU_PC_PASID_MATCH_REG, &reg);

reg = _GET_DOMID(ev) | (_GET_DOMID_MASK(ev) << 32);
if (reg)
reg |= BIT(31);
- amd_iommu_pc_get_set_reg_val(devid,
- _GET_BANK(ev), _GET_CNTR(ev) ,
- IOMMU_PC_DOMID_MATCH_REG, &reg, true);
+ amd_iommu_pc_set_reg(iommu, bank, cntr, IOMMU_PC_DOMID_MATCH_REG, &reg);
}

static void perf_iommu_disable_event(struct perf_event *event)
{
+ struct amd_iommu *iommu = get_amd_iommu(0);
u64 reg = 0ULL;

- amd_iommu_pc_get_set_reg_val(_GET_DEVID(event),
- _GET_BANK(event), _GET_CNTR(event),
- IOMMU_PC_COUNTER_SRC_REG, &reg, true);
+ amd_iommu_pc_set_reg(iommu, _GET_BANK(event), _GET_CNTR(event),
+ IOMMU_PC_COUNTER_SRC_REG, &reg);
}

static void perf_iommu_start(struct perf_event *event, int flags)
{
struct hw_perf_event *hwc = &event->hw;
+ struct amd_iommu *iommu = get_amd_iommu(0);

if (WARN_ON_ONCE(!(hwc->state & PERF_HES_STOPPED)))
return;
@@ -300,9 +296,8 @@ static void perf_iommu_start(struct perf_event *event, int flags)

if (flags & PERF_EF_RELOAD) {
u64 prev_raw_count = local64_read(&hwc->prev_count);
- amd_iommu_pc_get_set_reg_val(_GET_DEVID(event),
- _GET_BANK(event), _GET_CNTR(event),
- IOMMU_PC_COUNTER_REG, &prev_raw_count, true);
+ amd_iommu_pc_set_reg(iommu, _GET_BANK(event), _GET_CNTR(event),
+ IOMMU_PC_COUNTER_REG, &prev_raw_count);
}

perf_iommu_enable_event(event);
@@ -314,10 +309,11 @@ static void perf_iommu_read(struct perf_event *event)
{
u64 count, prev, delta;
struct hw_perf_event *hwc = &event->hw;
+ struct amd_iommu *iommu = get_amd_iommu(0);

- amd_iommu_pc_get_set_reg_val(_GET_DEVID(event),
- _GET_BANK(event), _GET_CNTR(event),
- IOMMU_PC_COUNTER_REG, &count, false);
+ if (amd_iommu_pc_get_reg(iommu, _GET_BANK(event), _GET_CNTR(event),
+ IOMMU_PC_COUNTER_REG, &count))
+ return;

/* IOMMU pc counter register is only 48 bits */
count &= GENMASK_ULL(47, 0);
diff --git a/arch/x86/events/amd/iommu.h b/arch/x86/events/amd/iommu.h
index b775107..62e0702 100644
--- a/arch/x86/events/amd/iommu.h
+++ b/arch/x86/events/amd/iommu.h
@@ -24,6 +24,8 @@
#define PC_MAX_SPEC_BNKS 64
#define PC_MAX_SPEC_CNTRS 16

+struct amd_iommu;
+
/* amd_iommu_init.c external support functions */
extern int amd_iommu_get_num_iommus(void);

@@ -33,8 +35,11 @@ extern u8 amd_iommu_pc_get_max_banks(unsigned int idx);

extern u8 amd_iommu_pc_get_max_counters(unsigned int idx);

-extern int amd_iommu_pc_get_set_reg_val(u16 devid, u8 bank, u8 cntr,
- u8 fxn, u64 *value, bool is_write);
+extern int amd_iommu_pc_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr,
+ u8 fxn, u64 *value);
+
+extern int amd_iommu_pc_get_reg(struct amd_iommu *iommu, u8 bank, u8 cntr,
+ u8 fxn, u64 *value);

extern struct amd_iommu *get_amd_iommu(int idx);

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 8fdf109..5a11328 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -256,10 +256,6 @@ static int amd_iommu_enable_interrupts(void);
static int __init iommu_go_to_state(enum iommu_init_state state);
static void init_device_table_dma(void);

-static int iommu_pc_get_set_reg_val(struct amd_iommu *iommu,
- u8 bank, u8 cntr, u8 fxn,
- u64 *value, bool is_write);
-
static inline void update_last_devid(u16 devid)
{
if (devid > amd_iommu_last_bdf)
@@ -1484,6 +1480,8 @@ static int __init init_iommu_all(struct acpi_table_header *table)
return 0;
}

+static int iommu_pc_get_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr,
+ u8 fxn, u64 *value, bool is_write);

static void init_iommu_perf_ctr(struct amd_iommu *iommu)
{
@@ -1495,8 +1493,8 @@ static void init_iommu_perf_ctr(struct amd_iommu *iommu)
amd_iommu_pc_present = true;

/* Check if the performance counters can be written to */
- if ((0 != iommu_pc_get_set_reg_val(iommu, 0, 0, 0, &val, true)) ||
- (0 != iommu_pc_get_set_reg_val(iommu, 0, 0, 0, &val2, false)) ||
+ if ((iommu_pc_get_set_reg(iommu, 0, 0, 0, &val, true)) ||
+ (iommu_pc_get_set_reg(iommu, 0, 0, 0, &val2, false)) ||
(val != val2)) {
pr_err("AMD-Vi: Unable to write to IOMMU perf counter.\n");
amd_iommu_pc_present = false;
@@ -2765,15 +2763,18 @@ u8 amd_iommu_pc_get_max_counters(unsigned int idx)
}
EXPORT_SYMBOL(amd_iommu_pc_get_max_counters);

-static int iommu_pc_get_set_reg_val(struct amd_iommu *iommu,
- u8 bank, u8 cntr, u8 fxn,
- u64 *value, bool is_write)
+static int iommu_pc_get_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr,
+ u8 fxn, u64 *value, bool is_write)
{
u32 offset;
u32 max_offset_lim;

+ /* Make sure the IOMMU PC resource is available */
+ if (!amd_iommu_pc_present)
+ return -ENODEV;
+
/* Check for valid iommu and pc register indexing */
- if (WARN_ON((fxn > 0x28) || (fxn & 7)))
+ if (WARN_ON(!iommu || (fxn > 0x28) || (fxn & 7)))
return -ENODEV;

offset = (u32)(((0x40 | bank) << 12) | (cntr << 8) | fxn);
@@ -2799,17 +2800,21 @@ static int iommu_pc_get_set_reg_val(struct amd_iommu *iommu,

return 0;
}
-EXPORT_SYMBOL(amd_iommu_pc_get_set_reg_val);

-int amd_iommu_pc_get_set_reg_val(u16 devid, u8 bank, u8 cntr, u8 fxn,
- u64 *value, bool is_write)
+int amd_iommu_pc_get_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, u8 fxn, u64 *value)
{
- struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
+ if (!iommu)
+ return -EINVAL;

- /* Make sure the IOMMU PC resource is available */
- if (!amd_iommu_pc_present || iommu == NULL)
- return -ENODEV;
+ return iommu_pc_get_set_reg(iommu, bank, cntr, fxn, value, false);
+}
+EXPORT_SYMBOL(amd_iommu_pc_get_reg);
+
+int amd_iommu_pc_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, u8 fxn, u64 *value)
+{
+ if (!iommu)
+ return -EINVAL;

- return iommu_pc_get_set_reg_val(iommu, bank, cntr, fxn,
- value, is_write);
+ return iommu_pc_get_set_reg(iommu, bank, cntr, fxn, value, true);
}
+EXPORT_SYMBOL(amd_iommu_pc_set_reg);
diff --git a/drivers/iommu/amd_iommu_proto.h b/drivers/iommu/amd_iommu_proto.h
index cd2257e..466260f 100644
--- a/drivers/iommu/amd_iommu_proto.h
+++ b/drivers/iommu/amd_iommu_proto.h
@@ -57,11 +57,6 @@ extern int amd_iommu_domain_set_gcr3(struct iommu_domain *dom, int pasid,
extern int amd_iommu_domain_clear_gcr3(struct iommu_domain *dom, int pasid);
extern struct iommu_domain *amd_iommu_get_v2_domain(struct pci_dev *pdev);

-/* IOMMU Performance Counter functions */
-extern bool amd_iommu_pc_supported(void);
-extern int amd_iommu_pc_get_set_reg_val(u16 devid, u8 bank, u8 cntr, u8 fxn,
- u64 *value, bool is_write);
-
#ifdef CONFIG_IRQ_REMAP
extern int amd_iommu_create_irq_domain(struct amd_iommu *iommu);
#else

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