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Date: Thu, 23 Aug 2012 17:44:22 -0600
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: Matthew Garrett <mjg@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
linux-efi@...r.kernel.org, mfleming@...el.com, dwmw2@...radead.org
Subject: Re: [PATCH V3 1/4] EFI: Stash ROMs if they're not in the PCI BAR
On Thu, Aug 23, 2012 at 10:36 AM, Matthew Garrett <mjg@...hat.com> wrote:
> EFI provides support for providing PCI ROMs via means other than the ROM
> BAR. This support vanishes after we've exited boot services, so add support
> for stashing copies of the ROMs in setup_data if they're not otherwise
> available.
-ENO_SIGNED_OFF_BY
I'll add it if you confirm it.
> ---
> arch/x86/boot/compressed/eboot.c | 118 +++++++++++++++++++++++++++++++++++++++
> arch/x86/include/asm/bootparam.h | 1 +
> arch/x86/include/asm/pci.h | 12 ++++
> include/linux/efi.h | 71 +++++++++++++++++++++++
> 4 files changed, 202 insertions(+)
>
> diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
> index b3e0227..8630578 100644
> --- a/arch/x86/boot/compressed/eboot.c
> +++ b/arch/x86/boot/compressed/eboot.c
> @@ -8,6 +8,7 @@
> * ----------------------------------------------------------------------- */
>
> #include <linux/efi.h>
> +#include <linux/pci.h>
> #include <asm/efi.h>
> #include <asm/setup.h>
> #include <asm/desc.h>
> @@ -243,6 +244,121 @@ static void find_bits(unsigned long mask, u8 *pos, u8 *size)
> *size = len;
> }
>
> +static efi_status_t setup_efi_pci(struct boot_params *params)
> +{
> + efi_pci_io_protocol *pci;
> + efi_status_t status;
> + void **pci_handle;
> + efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
> + unsigned long nr_pci, size = 0;
> + int i;
> + struct setup_data *data;
> +
> + data = (struct setup_data *)params->hdr.setup_data;
> +
> + while (data && data->next)
> + data = (struct setup_data *)data->next;
> +
> + status = efi_call_phys5(sys_table->boottime->locate_handle,
> + EFI_LOCATE_BY_PROTOCOL, &pci_proto,
> + NULL, &size, pci_handle);
> +
> + if (status == EFI_BUFFER_TOO_SMALL) {
> + status = efi_call_phys3(sys_table->boottime->allocate_pool,
> + EFI_LOADER_DATA, size, &pci_handle);
> +
> + if (status != EFI_SUCCESS)
> + return status;
> +
> + status = efi_call_phys5(sys_table->boottime->locate_handle,
> + EFI_LOCATE_BY_PROTOCOL, &pci_proto,
> + NULL, &size, pci_handle);
> + }
> +
> + if (status != EFI_SUCCESS)
> + goto free_handle;
> +
> + nr_pci = size / sizeof(void *);
> + for (i = 0; i < nr_pci; i++) {
> + void *h = pci_handle[i];
> + uint64_t attributes;
> + struct pci_setup_rom *rom;
> +
> + status = efi_call_phys3(sys_table->boottime->handle_protocol,
> + h, &pci_proto, &pci);
> +
> + if (status != EFI_SUCCESS)
> + continue;
> +
> + if (!pci)
> + continue;
> +
> + status = efi_call_phys4(pci->attributes, pci,
> + EfiPciIoAttributeOperationGet, 0,
> + &attributes);
> +
> + if (status != EFI_SUCCESS)
> + continue;
> +
> + if (!attributes & EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM)
> + continue;
> +
> + if (!pci->romimage || !pci->romsize)
> + continue;
> +
> + size = pci->romsize + sizeof(*rom);
> +
> + status = efi_call_phys3(sys_table->boottime->allocate_pool,
> + EFI_LOADER_DATA, size, &rom);
> +
> + if (status != EFI_SUCCESS)
> + continue;
> +
> + rom->data.type = SETUP_PCI;
> + rom->data.len = size - sizeof(struct setup_data);
> + rom->data.next = 0;
> + rom->pcilen = pci->romsize;
> +
> + status = efi_call_phys5(pci->pci.read, pci,
> + EfiPciIoWidthUint16, PCI_VENDOR_ID,
> + 1, &(rom->vendor));
> +
> + if (status != EFI_SUCCESS)
> + goto free_struct;
> +
> + status = efi_call_phys5(pci->pci.read, pci,
> + EfiPciIoWidthUint16, PCI_DEVICE_ID,
> + 1, &(rom->devid));
> +
> + if (status != EFI_SUCCESS)
> + goto free_struct;
> +
> + status = efi_call_phys5(pci->get_location, pci,
> + &(rom->segment), &(rom->bus),
> + &(rom->device), &(rom->function));
> +
> + if (status != EFI_SUCCESS)
> + goto free_struct;
> +
> + memcpy(rom->romdata, pci->romimage, pci->romsize);
> +
> + if (data)
> + data->next = (uint64_t)rom;
> + else
> + params->hdr.setup_data = (uint64_t)rom;
> +
> + data = (struct setup_data *)rom;
> +
> + continue;
> + free_struct:
> + efi_call_phys1(sys_table->boottime->free_pool, rom);
> + }
> +
> +free_handle:
> + efi_call_phys1(sys_table->boottime->free_pool, pci_handle);
> + return status;
> +}
> +
> /*
> * See if we have Graphics Output Protocol
> */
> @@ -1020,6 +1136,8 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
>
> setup_graphics(boot_params);
>
> + setup_efi_pci(boot_params);
> +
> status = efi_call_phys3(sys_table->boottime->allocate_pool,
> EFI_LOADER_DATA, sizeof(*gdt),
> (void **)&gdt);
> diff --git a/arch/x86/include/asm/bootparam.h b/arch/x86/include/asm/bootparam.h
> index 2ad874c..92862cd 100644
> --- a/arch/x86/include/asm/bootparam.h
> +++ b/arch/x86/include/asm/bootparam.h
> @@ -13,6 +13,7 @@
> #define SETUP_NONE 0
> #define SETUP_E820_EXT 1
> #define SETUP_DTB 2
> +#define SETUP_PCI 3
>
> /* extensible setup data list node */
> struct setup_data {
> diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
> index df75d07..11491d1 100644
> --- a/arch/x86/include/asm/pci.h
> +++ b/arch/x86/include/asm/pci.h
> @@ -171,4 +171,16 @@ cpumask_of_pcibus(const struct pci_bus *bus)
> }
> #endif
>
> +struct pci_setup_rom {
> + struct setup_data data;
> + uint16_t vendor;
> + uint16_t devid;
> + uint64_t pcilen;
> + unsigned long segment;
> + unsigned long bus;
> + unsigned long device;
> + unsigned long function;
> + uint8_t romdata[0];
> +};
> +
> #endif /* _ASM_X86_PCI_H */
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index ec45ccd..bf7e867 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -196,6 +196,77 @@ typedef struct {
> void *create_event_ex;
> } efi_boot_services_t;
>
> +typedef enum {
> + EfiPciIoWidthUint8,
> + EfiPciIoWidthUint16,
> + EfiPciIoWidthUint32,
> + EfiPciIoWidthUint64,
> + EfiPciIoWidthFifoUint8,
> + EfiPciIoWidthFifoUint16,
> + EfiPciIoWidthFifoUint32,
> + EfiPciIoWidthFifoUint64,
> + EfiPciIoWidthFillUint8,
> + EfiPciIoWidthFillUint16,
> + EfiPciIoWidthFillUint32,
> + EfiPciIoWidthFillUint64,
> + EfiPciIoWidthMaximum
> +} EFI_PCI_IO_PROTOCOL_WIDTH;
> +
> +typedef enum {
> + EfiPciIoAttributeOperationGet,
> + EfiPciIoAttributeOperationSet,
> + EfiPciIoAttributeOperationEnable,
> + EfiPciIoAttributeOperationDisable,
> + EfiPciIoAttributeOperationSupported,
> + EfiPciIoAttributeOperationMaximum
> +} EFI_PCI_IO_PROTOCOL_ATTRIBUTE_OPERATION;
> +
> +
> +typedef struct {
> + void *read;
> + void *write;
> +} efi_pci_io_protocol_access_t;
> +
> +typedef struct {
> + void *poll_mem;
> + void *poll_io;
> + efi_pci_io_protocol_access_t mem;
> + efi_pci_io_protocol_access_t io;
> + efi_pci_io_protocol_access_t pci;
> + void *copy_mem;
> + void *map;
> + void *unmap;
> + void *allocate_buffer;
> + void *free_buffer;
> + void *flush;
> + void *get_location;
> + void *attributes;
> + void *get_bar_attributes;
> + void *set_bar_attributes;
> + uint64_t romsize;
> + void *romimage;
> +} efi_pci_io_protocol;
> +
> +#define EFI_PCI_IO_ATTRIBUTE_ISA_MOTHERBOARD_IO 0x0001
> +#define EFI_PCI_IO_ATTRIBUTE_ISA_IO 0x0002
> +#define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO 0x0004
> +#define EFI_PCI_IO_ATTRIBUTE_VGA_MEMORY 0x0008
> +#define EFI_PCI_IO_ATTRIBUTE_VGA_IO 0x0010
> +#define EFI_PCI_IO_ATTRIBUTE_IDE_PRIMARY_IO 0x0020
> +#define EFI_PCI_IO_ATTRIBUTE_IDE_SECONDARY_IO 0x0040
> +#define EFI_PCI_IO_ATTRIBUTE_MEMORY_WRITE_COMBINE 0x0080
> +#define EFI_PCI_IO_ATTRIBUTE_IO 0x0100
> +#define EFI_PCI_IO_ATTRIBUTE_MEMORY 0x0200
> +#define EFI_PCI_IO_ATTRIBUTE_BUS_MASTER 0x0400
> +#define EFI_PCI_IO_ATTRIBUTE_MEMORY_CACHED 0x0800
> +#define EFI_PCI_IO_ATTRIBUTE_MEMORY_DISABLE 0x1000
> +#define EFI_PCI_IO_ATTRIBUTE_EMBEDDED_DEVICE 0x2000
> +#define EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM 0x4000
> +#define EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE 0x8000
> +#define EFI_PCI_IO_ATTRIBUTE_ISA_IO_16 0x10000
> +#define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO_16 0x20000
> +#define EFI_PCI_IO_ATTRIBUTE_VGA_IO_16 0x40000
> +
> /*
> * Types and defines for EFI ResetSystem
> */
> --
> 1.7.11.2
>
--
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