On 2018-01-12 01:22, Gustavo Lima Chaves wrote:
> Before Jailhouse claims devices, disable AER reporting altogether on
> them, because otherwise they could hit their root complexes, which would
> be in the root cell. When the hypervisor is disabled, turn back whatever
> values where on those previous configurations.
>
> Signed-off-by: Gustavo Lima Chaves <[email protected]>
> ---
> hypervisor/include/jailhouse/pci.h | 15 +++++++++
> hypervisor/pci.c | 63
> +++++++++++++++++++++++++++++++++++++-
> 2 files changed, 77 insertions(+), 1 deletion(-)
>
> diff --git a/hypervisor/include/jailhouse/pci.h
> b/hypervisor/include/jailhouse/pci.h
> index 720ecacd..6d256613 100644
> --- a/hypervisor/include/jailhouse/pci.h
> +++ b/hypervisor/include/jailhouse/pci.h
> @@ -39,6 +39,17 @@
> #define PCI_CAP_MSIX 0x11
> #define PCI_CAP_EXPRESS 0x10
>
> +#define PCI_CAP_PCIE (0x10 | JAILHOUSE_PCI_EXT_CAP)
I would OR the Jailhouse flag in on use and define PCI_CAP_PCIE purely
according to the spec here.
> +#define PCIE_CONTROL_REG 0x08
> +
> +#define PCIE_AER_FLAGS (PCIE_DEVCTL_CERE | PCIE_DEVCTL_NFERE | \
> + PCIE_DEVCTL_FERE | PCIE_DEVCTL_URRE)
That list could also be build on use, specifically as PCIE_AER_FLAGS is
not telling the purpose of the list.
> +
> +#define PCIE_DEVCTL_CERE 0x0001 /* Correctable Error Reporting En. */
> +#define PCIE_DEVCTL_NFERE 0x0002 /* Non-Fatal Error Reporting Enable */
> +#define PCIE_DEVCTL_FERE 0x0004 /* Fatal Error Reporting Enable */
> +#define PCIE_DEVCTL_URRE 0x0008 /* Unsupported Request Reporting En. */
> +
> #define PCI_IVSHMEM_NUM_MMIO_REGIONS 2
>
> struct cell;
> @@ -131,6 +142,10 @@ struct pci_device {
> /** Shadow BAR */
> u32 bar[PCI_NUM_BARS];
>
> + /** Shadow state of Device Control Register. */
> + u16 dev_ctrl_reg;
> + bool aer_override;
> +
> /** Shadow state of MSI config space registers. */
> union pci_msi_registers msi_registers;
>
> diff --git a/hypervisor/pci.c b/hypervisor/pci.c
> index 39f36f5f..30b733c9 100644
> --- a/hypervisor/pci.c
> +++ b/hypervisor/pci.c
> @@ -537,6 +537,64 @@ static void pci_restore_msix(struct pci_device *device,
> pci_suppress_msix(device, cap, false);
> }
>
> +static void pci_suppress_aer(struct pci_device *device)
> +{
> + const struct jailhouse_pci_capability *cap;
> + u16 bdf = device->info->bdf;
> + bool found = false;
> + u16 dev_ctrl_reg;
> + unsigned int n;
> +
> + if (device->info->type == JAILHOUSE_PCI_TYPE_IVSHMEM)
> + return;
Not needed because we do not call this function for physical devices.
> +
> + for_each_pci_cap(cap, device, n)
> + if (cap->id != PCI_CAP_EXPRESS)
> + continue;
> + else {
if () {
} else {
> + found = true;
> + break;
> + }
> +
> + if (!found)
> + return;
We can probably extract some pci_get_cap(device, cap_id) that returns a
cap pointer of NULL. Would simplify the code here and avoid the
duplication in pci_restore_aer.
> +
> + device->dev_ctrl_reg = pci_read_config(bdf, cap->start +
> + PCIE_CONTROL_REG,
> + sizeof(device->dev_ctrl_reg));
> + dev_ctrl_reg = device->dev_ctrl_reg;
Style nit:
dev_ctrl_reg = pci_read_config(bdf, cap->start + PCIE_CONTROL_REG,
sizeof(device->dev_ctrl_reg));
device->dev_ctrl_reg = dev_ctrl_reg;
> + dev_ctrl_reg &= ~PCIE_AER_FLAGS;
> + device->aer_override = true;
> +
> + pci_write_config(bdf, cap->start + PCIE_CONTROL_REG, dev_ctrl_reg,
> + sizeof(dev_ctrl_reg));
> +}
> +
> +static void pci_restore_aer(struct pci_device *device)
> +{
> + const struct jailhouse_pci_capability *cap;
> + bool found = false;
> + unsigned int n;
> +
> + if (!device->aer_override ||
> + device->info->type == JAILHOUSE_PCI_TYPE_IVSHMEM)
aer_override will not be set for IVSHMEM devices, so testing for it
alone is enough.
> + return;
> +
> + for_each_pci_cap(cap, device, n)
> + if (cap->id != PCI_CAP_EXPRESS)
> + continue;
> + else {
> + found = true;
> + break;
> + }
> +
> + if (!found)
> + return;
> +
> + pci_write_config(device->info->bdf, cap->start + PCIE_CONTROL_REG,
> + device->dev_ctrl_reg, sizeof(device->dev_ctrl_reg));
> +}
> +
> /**
> * Prepare the handover of PCI devices to Jailhouse or back to Linux.
> */
> @@ -725,8 +783,10 @@ int pci_cell_init(struct cell *cell)
>
> root_device = pci_get_assigned_device(&root_cell,
> dev_infos[ndev].bdf);
> - if (root_device)
> + if (root_device) {
> + pci_suppress_aer(root_device);
> pci_remove_physical_device(root_device);
> + }
>
> err = pci_add_physical_device(cell, device);
> if (err)
> @@ -799,6 +859,7 @@ void pci_cell_exit(struct cell *cell)
> pci_remove_physical_device(device);
> pci_return_device_to_root_cell(device);
> }
> + pci_restore_aer(device);
Shouldn't that be move into the block above?
> }
>
> page_free(&mem_pool, cell->pci_devices, devlist_pages);
>
Jan
--
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux
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