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Subject[PATCH 2/2] PCI-X/PCI-Express read control interfaces
Date
These driver changes incorporate the proposed PCI-X / PCI-Express read byte 
count interface. Reading and setting those valuse doesn't take
place "manually", instead wrapping functions are called to allow quirks for
some PCI bridges.

Signed-off by: Peter Oruba <peter.oruba@amd.com>
Based on work by Stephen Hemminger <shemminger@linux-foundation.org>

---
diff -uprN -X linux-2.6.22-rc1.orig/Documentation/dontdiff
linux-2.6.22-rc1.orig/drivers/infiniband/hw/mthca/mthca_main.c
linux-2.6.22-rc1/drivers/infiniband/hw/mthca/mthca_main.c
--- linux-2.6.22-rc1.orig/drivers/infiniband/hw/mthca/mthca_main.c 2007-05-14
11:29:29.358547000 +0200
+++ linux-2.6.22-rc1/drivers/infiniband/hw/mthca/mthca_main.c 2007-05-15
10:55:24.954074000 +0200
@@ -137,45 +137,27 @@ static const char mthca_version[] __devi

static int mthca_tune_pci(struct mthca_dev *mdev)
{
- int cap;
- u16 val;
-
if (!tune_pci)
return 0;

/* First try to max out Read Byte Count */
- cap = pci_find_capability(mdev->pdev, PCI_CAP_ID_PCIX);
- if (cap) {
- if (pci_read_config_word(mdev->pdev, cap + PCI_X_CMD, &val)) {
- mthca_err(mdev, "Couldn't read PCI-X command register, "
- "aborting.\n");
- return -ENODEV;
- }
- val = (val & ~PCI_X_CMD_MAX_READ) | (3 << 2);
- if (pci_write_config_word(mdev->pdev, cap + PCI_X_CMD, val)) {
- mthca_err(mdev, "Couldn't write PCI-X command register, "
- "aborting.\n");
+ if (pci_find_capability(mdev->pdev, PCI_CAP_ID_PCIX)) {
+ if (pcix_set_mmrbc(mdev->pdev, pcix_get_max_mmrbc(mdev->pdev))) {
+ mthca_err(mdev, "Couldn't set PCI-X max read count, "
+ "aborting.\n");
return -ENODEV;
}
} else if (!(mdev->mthca_flags & MTHCA_FLAG_PCIE))
mthca_info(mdev, "No PCI-X capability, not setting RBC.\n");

- cap = pci_find_capability(mdev->pdev, PCI_CAP_ID_EXP);
- if (cap) {
- if (pci_read_config_word(mdev->pdev, cap + PCI_EXP_DEVCTL, &val)) {
- mthca_err(mdev, "Couldn't read PCI Express device control "
- "register, aborting.\n");
- return -ENODEV;
- }
- val = (val & ~PCI_EXP_DEVCTL_READRQ) | (5 << 12);
- if (pci_write_config_word(mdev->pdev, cap + PCI_EXP_DEVCTL, val)) {
- mthca_err(mdev, "Couldn't write PCI Express device control "
- "register, aborting.\n");
+ if (pci_find_capability(mdev->pdev, PCI_CAP_ID_EXP)) {
+ if (pcie_set_readrq(mdev->pdev, 4096)) {
+ mthca_err(mdev, "Couldn't write PCI Express read request, "
+ "aborting.\n");
return -ENODEV;
}
- } else if (mdev->mthca_flags & MTHCA_FLAG_PCIE)
- mthca_info(mdev, "No PCI Express capability, "
- "not setting Max Read Request Size.\n");
+ } else if (!(mdev->mthca_flags & MTHCA_FLAG_PCIE))
+ mthca_info(mdev, "No PCI-X capability, not setting RBC.\n");

return 0;
}
diff -uprN -X linux-2.6.22-rc1.orig/Documentation/dontdiff
linux-2.6.22-rc1.orig/drivers/net/e1000/e1000_hw.c
linux-2.6.22-rc1/drivers/net/e1000/e1000_hw.c
--- linux-2.6.22-rc1.orig/drivers/net/e1000/e1000_hw.c 2007-04-26
05:08:32.000000000 +0200
+++ linux-2.6.22-rc1/drivers/net/e1000/e1000_hw.c 2007-05-15
11:07:24.726991000 +0200
@@ -865,10 +865,6 @@ e1000_init_hw(struct e1000_hw *hw)
uint32_t ctrl;
uint32_t i;
int32_t ret_val;
- uint16_t pcix_cmd_word;
- uint16_t pcix_stat_hi_word;
- uint16_t cmd_mmrbc;
- uint16_t stat_mmrbc;
uint32_t mta_size;
uint32_t reg_data;
uint32_t ctrl_ext;
@@ -958,24 +954,9 @@ e1000_init_hw(struct e1000_hw *hw)
break;
default:
/* Workaround for PCI-X problem when BIOS sets MMRBC incorrectly. */
- if (hw->bus_type == e1000_bus_type_pcix) {
- e1000_read_pci_cfg(hw, PCIX_COMMAND_REGISTER, &pcix_cmd_word);
- e1000_read_pci_cfg(hw, PCIX_STATUS_REGISTER_HI,
- &pcix_stat_hi_word);
- cmd_mmrbc = (pcix_cmd_word & PCIX_COMMAND_MMRBC_MASK) >>
- PCIX_COMMAND_MMRBC_SHIFT;
- stat_mmrbc = (pcix_stat_hi_word & PCIX_STATUS_HI_MMRBC_MASK) >>
- PCIX_STATUS_HI_MMRBC_SHIFT;
- if (stat_mmrbc == PCIX_STATUS_HI_MMRBC_4K)
- stat_mmrbc = PCIX_STATUS_HI_MMRBC_2K;
- if (cmd_mmrbc > stat_mmrbc) {
- pcix_cmd_word &= ~PCIX_COMMAND_MMRBC_MASK;
- pcix_cmd_word |= stat_mmrbc << PCIX_COMMAND_MMRBC_SHIFT;
- e1000_write_pci_cfg(hw, PCIX_COMMAND_REGISTER,
- &pcix_cmd_word);
- }
- }
- break;
+ if (hw->bus_type == e1000_bus_type_pcix && e1000_pcix_get_mmrbc(hw) > 2048)
+ e1000_pcix_set_mmrbc(hw, 2048);
+ break;
}

/* More time needed for PHY to initialize */
diff -uprN -X linux-2.6.22-rc1.orig/Documentation/dontdiff
linux-2.6.22-rc1.orig/drivers/net/e1000/e1000_hw.h
linux-2.6.22-rc1/drivers/net/e1000/e1000_hw.h
--- linux-2.6.22-rc1.orig/drivers/net/e1000/e1000_hw.h 2007-04-26
05:08:32.000000000 +0200
+++ linux-2.6.22-rc1/drivers/net/e1000/e1000_hw.h 2007-05-15
11:10:17.115782000 +0200
@@ -424,6 +424,8 @@ void e1000_pci_clear_mwi(struct e1000_hw
void e1000_read_pci_cfg(struct e1000_hw *hw, uint32_t reg, uint16_t * value);
void e1000_write_pci_cfg(struct e1000_hw *hw, uint32_t reg, uint16_t *
value);
int32_t e1000_read_pcie_cap_reg(struct e1000_hw *hw, uint32_t reg, uint16_t
*value);
+void e1000_pcix_set_mmrbc(struct e1000_hw *hw, int mmrbc);
+int e1000_pcix_get_mmrbc(struct e1000_hw *hw);
/* Port I/O is only supported on 82544 and newer */
void e1000_io_write(struct e1000_hw *hw, unsigned long port, uint32_t value);
int32_t e1000_disable_pciex_master(struct e1000_hw *hw);
diff -uprN -X linux-2.6.22-rc1.orig/Documentation/dontdiff
linux-2.6.22-rc1.orig/drivers/net/e1000/e1000_main.c
linux-2.6.22-rc1/drivers/net/e1000/e1000_main.c
--- linux-2.6.22-rc1.orig/drivers/net/e1000/e1000_main.c 2007-05-14
11:29:35.324875000 +0200
+++ linux-2.6.22-rc1/drivers/net/e1000/e1000_main.c 2007-05-15
11:10:18.358679000 +0200
@@ -4912,6 +4912,20 @@ e1000_write_pci_cfg(struct e1000_hw *hw,
pci_write_config_word(adapter->pdev, reg, *value);
}

+int
+e1000_pcix_get_mmrbc(struct e1000_hw *hw)
+{
+ struct e1000_adapter *adapter = hw->back;
+ return pcix_get_mmrbc(adapter->pdev);
+}
+
+void
+e1000_pcix_set_mmrbc(struct e1000_hw *hw, int mmrbc)
+{
+ struct e1000_adapter *adapter = hw->back;
+ pcix_set_mmrbc(adapter->pdev, mmrbc);
+}
+
int32_t
e1000_read_pcie_cap_reg(struct e1000_hw *hw, uint32_t reg, uint16_t *value)
{
diff -uprN -X linux-2.6.22-rc1.orig/Documentation/dontdiff
linux-2.6.22-rc1.orig/drivers/net/myri10ge/myri10ge.c
linux-2.6.22-rc1/drivers/net/myri10ge/myri10ge.c
--- linux-2.6.22-rc1.orig/drivers/net/myri10ge/myri10ge.c 2007-05-14
11:29:36.235781000 +0200
+++ linux-2.6.22-rc1/drivers/net/myri10ge/myri10ge.c 2007-05-15
11:10:18.974579000 +0200
@@ -2873,8 +2873,7 @@ static int myri10ge_probe(struct pci_dev
status);
goto abort_with_netdev;
}
- val = (val & ~PCI_EXP_DEVCTL_READRQ) | (5 << 12);
- status = pci_write_config_word(pdev, cap + PCI_EXP_DEVCTL, val);
+ status = pcie_set_readrq(pdev, 4096);
if (status != 0) {
dev_err(&pdev->dev, "Error %d writing PCI_EXP_DEVCTL\n",
status);
diff -uprN -X linux-2.6.22-rc1.orig/Documentation/dontdiff
linux-2.6.22-rc1.orig/drivers/scsi/qla2xxx/qla_init.c
linux-2.6.22-rc1/drivers/scsi/qla2xxx/qla_init.c
--- linux-2.6.22-rc1.orig/drivers/scsi/qla2xxx/qla_init.c 2007-05-14
11:29:41.561311000 +0200
+++ linux-2.6.22-rc1/drivers/scsi/qla2xxx/qla_init.c 2007-05-15
10:39:29.636747000 +0200
@@ -281,15 +281,9 @@ qla24xx_pci_config(scsi_qla_host_t *ha)

/* PCIe -- adjust Maximum Read Request Size (2048). */
pcie_dctl_reg = pci_find_capability(ha->pdev, PCI_CAP_ID_EXP);
- if (pcie_dctl_reg) {
- uint16_t pcie_dctl;
-
- pcie_dctl_reg += PCI_EXP_DEVCTL;
- pci_read_config_word(ha->pdev, pcie_dctl_reg, &pcie_dctl);
- pcie_dctl &= ~PCI_EXP_DEVCTL_READRQ;
- pcie_dctl |= 0x4000;
- pci_write_config_word(ha->pdev, pcie_dctl_reg, pcie_dctl);
- }
+ if (pcie_dctl_reg)
+ if (pcie_set_readrq(ha->pdev, 2048))
+ DEBUG2(printk("Couldn't write PCI Express read request\n"));

/* Reset expansion ROM address decode enable */
pci_read_config_dword(ha->pdev, PCI_ROM_ADDRESS, &d);
---
--
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