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Subject[PATCH v18 04/11] PCI/DPC: Move DPC data into struct pci_dev
Date
From: Bjorn Helgaas <bhelgaas@google.com>

We only need 25 bits of data for DPC, so I don't think it's worth the
complexity of allocating and keeping track of the struct dpc_dev separately
from the pci_dev. Move that data into the struct pci_dev.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/pci/pcie/dpc.c | 103 +++++++++++++----------------------------
include/linux/pci.h | 5 ++
2 files changed, 36 insertions(+), 72 deletions(-)

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index 0e356ed0d73f..5c2e9d45a269 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -18,13 +18,6 @@
#include "portdrv.h"
#include "../pci.h"

-struct dpc_dev {
- struct pcie_device *dev;
- u16 cap_pos;
- bool rp_extensions;
- u8 rp_log_size;
-};
-
static const char * const rp_pio_error_string[] = {
"Configuration Request received UR Completion", /* Bit Position 0 */
"Configuration Request received CA Completion", /* Bit Position 1 */
@@ -47,63 +40,42 @@ static const char * const rp_pio_error_string[] = {
"Memory Request Completion Timeout", /* Bit Position 18 */
};

-static struct dpc_dev *to_dpc_dev(struct pci_dev *dev)
-{
- struct device *device;
-
- device = pcie_port_find_device(dev, PCIE_PORT_SERVICE_DPC);
- if (!device)
- return NULL;
- return get_service_data(to_pcie_device(device));
-}
-
void pci_save_dpc_state(struct pci_dev *dev)
{
- struct dpc_dev *dpc;
struct pci_cap_saved_state *save_state;
u16 *cap;

if (!pci_is_pcie(dev))
return;

- dpc = to_dpc_dev(dev);
- if (!dpc)
- return;
-
save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_DPC);
if (!save_state)
return;

cap = (u16 *)&save_state->cap.data[0];
- pci_read_config_word(dev, dpc->cap_pos + PCI_EXP_DPC_CTL, cap);
+ pci_read_config_word(dev, dev->dpc_cap + PCI_EXP_DPC_CTL, cap);
}

void pci_restore_dpc_state(struct pci_dev *dev)
{
- struct dpc_dev *dpc;
struct pci_cap_saved_state *save_state;
u16 *cap;

if (!pci_is_pcie(dev))
return;

- dpc = to_dpc_dev(dev);
- if (!dpc)
- return;
-
save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_DPC);
if (!save_state)
return;

cap = (u16 *)&save_state->cap.data[0];
- pci_write_config_word(dev, dpc->cap_pos + PCI_EXP_DPC_CTL, *cap);
+ pci_write_config_word(dev, dev->dpc_cap + PCI_EXP_DPC_CTL, *cap);
}

-static int dpc_wait_rp_inactive(struct dpc_dev *dpc)
+static int dpc_wait_rp_inactive(struct pci_dev *pdev)
{
unsigned long timeout = jiffies + HZ;
- struct pci_dev *pdev = dpc->dev->port;
- u16 cap = dpc->cap_pos, status;
+ u16 cap = pdev->dpc_cap, status;

pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);
while (status & PCI_EXP_DPC_RP_BUSY &&
@@ -120,15 +92,13 @@ static int dpc_wait_rp_inactive(struct dpc_dev *dpc)

static pci_ers_result_t dpc_reset_link(struct pci_dev *pdev)
{
- struct dpc_dev *dpc;
u16 cap;

/*
* DPC disables the Link automatically in hardware, so it has
* already been reset by the time we get here.
*/
- dpc = to_dpc_dev(pdev);
- cap = dpc->cap_pos;
+ cap = pdev->dpc_cap;

/*
* Wait until the Link is inactive, then clear DPC Trigger Status
@@ -136,7 +106,7 @@ static pci_ers_result_t dpc_reset_link(struct pci_dev *pdev)
*/
pcie_wait_for_link(pdev, false);

- if (dpc->rp_extensions && dpc_wait_rp_inactive(dpc))
+ if (pdev->dpc_rp_extensions && dpc_wait_rp_inactive(pdev))
return PCI_ERS_RESULT_DISCONNECT;

pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS,
@@ -155,10 +125,9 @@ static pci_ers_result_t dpc_reset_link(struct pci_dev *pdev)
return PCI_ERS_RESULT_RECOVERED;
}

-static void dpc_process_rp_pio_error(struct dpc_dev *dpc)
+static void dpc_process_rp_pio_error(struct pci_dev *pdev)
{
- struct pci_dev *pdev = dpc->dev->port;
- u16 cap = dpc->cap_pos, dpc_status, first_error;
+ u16 cap = pdev->dpc_cap, dpc_status, first_error;
u32 status, mask, sev, syserr, exc, dw0, dw1, dw2, dw3, log, prefix;
int i;

@@ -183,7 +152,7 @@ static void dpc_process_rp_pio_error(struct dpc_dev *dpc)
first_error == i ? " (First)" : "");
}

- if (dpc->rp_log_size < 4)
+ if (pdev->dpc_rp_log_size < 4)
goto clear_status;
pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG,
&dw0);
@@ -196,12 +165,12 @@ static void dpc_process_rp_pio_error(struct dpc_dev *dpc)
pci_err(pdev, "TLP Header: %#010x %#010x %#010x %#010x\n",
dw0, dw1, dw2, dw3);

- if (dpc->rp_log_size < 5)
+ if (pdev->dpc_rp_log_size < 5)
goto clear_status;
pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_IMPSPEC_LOG, &log);
pci_err(pdev, "RP PIO ImpSpec Log %#010x\n", log);

- for (i = 0; i < dpc->rp_log_size - 5; i++) {
+ for (i = 0; i < pdev->dpc_rp_log_size - 5; i++) {
pci_read_config_dword(pdev,
cap + PCI_EXP_DPC_RP_PIO_TLPPREFIX_LOG, &prefix);
pci_err(pdev, "TLP Prefix Header: dw%d, %#010x\n", i, prefix);
@@ -234,10 +203,9 @@ static int dpc_get_aer_uncorrect_severity(struct pci_dev *dev,

static irqreturn_t dpc_handler(int irq, void *context)
{
+ struct pci_dev *pdev = context;
+ u16 cap = pdev->dpc_cap, status, source, reason, ext_reason;
struct aer_err_info info;
- struct dpc_dev *dpc = context;
- struct pci_dev *pdev = dpc->dev->port;
- u16 cap = dpc->cap_pos, status, source, reason, ext_reason;

pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);
pci_read_config_word(pdev, cap + PCI_EXP_DPC_SOURCE_ID, &source);
@@ -256,8 +224,8 @@ static irqreturn_t dpc_handler(int irq, void *context)
"reserved error");

/* show RP PIO error detail information */
- if (dpc->rp_extensions && reason == 3 && ext_reason == 0)
- dpc_process_rp_pio_error(dpc);
+ if (pdev->dpc_rp_extensions && reason == 3 && ext_reason == 0)
+ dpc_process_rp_pio_error(pdev);
else if (reason == 0 &&
dpc_get_aer_uncorrect_severity(pdev, &info) &&
aer_get_device_error_info(pdev, &info)) {
@@ -274,9 +242,8 @@ static irqreturn_t dpc_handler(int irq, void *context)

static irqreturn_t dpc_irq(int irq, void *context)
{
- struct dpc_dev *dpc = (struct dpc_dev *)context;
- struct pci_dev *pdev = dpc->dev->port;
- u16 cap = dpc->cap_pos, status;
+ struct pci_dev *pdev = context;
+ u16 cap = pdev->dpc_cap, status;

pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);

@@ -293,7 +260,6 @@ static irqreturn_t dpc_irq(int irq, void *context)
#define FLAG(x, y) (((x) & (y)) ? '+' : '-')
static int dpc_probe(struct pcie_device *dev)
{
- struct dpc_dev *dpc;
struct pci_dev *pdev = dev->port;
struct device *device = &dev->device;
int status;
@@ -302,43 +268,37 @@ static int dpc_probe(struct pcie_device *dev)
if (pcie_aer_get_firmware_first(pdev) && !pcie_ports_dpc_native)
return -ENOTSUPP;

- dpc = devm_kzalloc(device, sizeof(*dpc), GFP_KERNEL);
- if (!dpc)
- return -ENOMEM;
-
- dpc->cap_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DPC);
- dpc->dev = dev;
- set_service_data(dev, dpc);
+ pdev->dpc_cap = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DPC);

status = devm_request_threaded_irq(device, dev->irq, dpc_irq,
dpc_handler, IRQF_SHARED,
- "pcie-dpc", dpc);
+ "pcie-dpc", pdev);
if (status) {
pci_warn(pdev, "request IRQ%d failed: %d\n", dev->irq,
status);
return status;
}

- pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CAP, &cap);
- pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl);
+ pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CAP, &cap);
+ pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, &ctl);

- dpc->rp_extensions = (cap & PCI_EXP_DPC_CAP_RP_EXT);
- if (dpc->rp_extensions) {
- dpc->rp_log_size = (cap & PCI_EXP_DPC_RP_PIO_LOG_SIZE) >> 8;
- if (dpc->rp_log_size < 4 || dpc->rp_log_size > 9) {
+ pdev->dpc_rp_extensions = (cap & PCI_EXP_DPC_CAP_RP_EXT) ? 1 : 0;
+ if (pdev->dpc_rp_extensions) {
+ pdev->dpc_rp_log_size = (cap & PCI_EXP_DPC_RP_PIO_LOG_SIZE) >> 8;
+ if (pdev->dpc_rp_log_size < 4 || pdev->dpc_rp_log_size > 9) {
pci_err(pdev, "RP PIO log size %u is invalid\n",
- dpc->rp_log_size);
- dpc->rp_log_size = 0;
+ pdev->dpc_rp_log_size);
+ pdev->dpc_rp_log_size = 0;
}
}

ctl = (ctl & 0xfff4) | PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN;
- pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, ctl);
+ pci_write_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, ctl);

pci_info(pdev, "error containment capabilities: Int Msg #%d, RPExt%c PoisonedTLP%c SwTrigger%c RP PIO Log %d, DL_ActiveErr%c\n",
cap & PCI_EXP_DPC_IRQ, FLAG(cap, PCI_EXP_DPC_CAP_RP_EXT),
FLAG(cap, PCI_EXP_DPC_CAP_POISONED_TLP),
- FLAG(cap, PCI_EXP_DPC_CAP_SW_TRIGGER), dpc->rp_log_size,
+ FLAG(cap, PCI_EXP_DPC_CAP_SW_TRIGGER), pdev->dpc_rp_log_size,
FLAG(cap, PCI_EXP_DPC_CAP_DL_ACTIVE));

pci_add_ext_cap_save_buffer(pdev, PCI_EXT_CAP_ID_DPC, sizeof(u16));
@@ -347,13 +307,12 @@ static int dpc_probe(struct pcie_device *dev)

static void dpc_remove(struct pcie_device *dev)
{
- struct dpc_dev *dpc = get_service_data(dev);
struct pci_dev *pdev = dev->port;
u16 ctl;

- pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl);
+ pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, &ctl);
ctl &= ~(PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN);
- pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, ctl);
+ pci_write_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, ctl);
}

static struct pcie_port_service_driver dpcdriver = {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 3840a541a9de..a0b7e7a53741 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -444,6 +444,11 @@ struct pci_dev {
const struct attribute_group **msi_irq_groups;
#endif
struct pci_vpd *vpd;
+#ifdef CONFIG_PCIE_DPC
+ u16 dpc_cap;
+ unsigned int dpc_rp_extensions:1;
+ u8 dpc_rp_log_size;
+#endif
#ifdef CONFIG_PCI_ATS
union {
struct pci_sriov *sriov; /* PF: SR-IOV info */
--
2.17.1
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