Re: [PATCH v2 7/9] PCI: endpoint: Add the function number as argument to EPC ops

From: Kishon Vijay Abraham I
Date: Fri Dec 29 2017 - 04:23:59 EST

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Hi,

On Monday 18 December 2017 11:46 PM, Cyrille Pitchen wrote:
> This patch updates the prototype of most handlers from 'struct
> pci_epc_ops' so the EPC library can now support multi-function devices.
>
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/pci/dwc/pcie-designware-ep.c | 20 +++++----
> drivers/pci/endpoint/functions/pci-epf-test.c | 41 ++++++++++--------
> drivers/pci/endpoint/pci-epc-core.c | 62 ++++++++++++++++-----------
> include/linux/pci-epc.h | 43 +++++++++++--------
> 4 files changed, 96 insertions(+), 70 deletions(-)
>
> diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
> index d53d5f168363..7a573d8bb62d 100644
> --- a/drivers/pci/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/dwc/pcie-designware-ep.c
> @@ -39,7 +39,7 @@ static void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
> dw_pcie_writel_dbi(pci, reg, 0x0);
> }
>
> -static int dw_pcie_ep_write_header(struct pci_epc *epc,
> +static int dw_pcie_ep_write_header(struct pci_epc *epc, u8 func_no,
> struct pci_epf_header *hdr)
> {
> struct dw_pcie_ep *ep = epc_get_drvdata(epc);
> @@ -112,7 +112,8 @@ static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, phys_addr_t phys_addr,
> return 0;
> }
>
> -static void dw_pcie_ep_clear_bar(struct pci_epc *epc, enum pci_barno bar)
> +static void dw_pcie_ep_clear_bar(struct pci_epc *epc, u8 func_no,
> + enum pci_barno bar)
> {
> struct dw_pcie_ep *ep = epc_get_drvdata(epc);
> struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> @@ -124,7 +125,8 @@ static void dw_pcie_ep_clear_bar(struct pci_epc *epc, enum pci_barno bar)
> clear_bit(atu_index, &ep->ib_window_map);
> }
>
> -static int dw_pcie_ep_set_bar(struct pci_epc *epc, enum pci_barno bar,
> +static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no,
> + enum pci_barno bar,
> dma_addr_t bar_phys, size_t size, int flags)
> {
> int ret;
> @@ -163,7 +165,8 @@ static int dw_pcie_find_index(struct dw_pcie_ep *ep, phys_addr_t addr,
> return -EINVAL;
> }
>
> -static void dw_pcie_ep_unmap_addr(struct pci_epc *epc, phys_addr_t addr)
> +static void dw_pcie_ep_unmap_addr(struct pci_epc *epc, u8 func_no,
> + phys_addr_t addr)
> {
> int ret;
> u32 atu_index;
> @@ -178,7 +181,8 @@ static void dw_pcie_ep_unmap_addr(struct pci_epc *epc, phys_addr_t addr)
> clear_bit(atu_index, &ep->ob_window_map);
> }
>
> -static int dw_pcie_ep_map_addr(struct pci_epc *epc, phys_addr_t addr,
> +static int dw_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no,
> + phys_addr_t addr,
> u64 pci_addr, size_t size)
> {
> int ret;
> @@ -194,7 +198,7 @@ static int dw_pcie_ep_map_addr(struct pci_epc *epc, phys_addr_t addr,
> return 0;
> }
>
> -static int dw_pcie_ep_get_msi(struct pci_epc *epc)
> +static int dw_pcie_ep_get_msi(struct pci_epc *epc, u8 func_no)
> {
> int val;
> u32 lower_addr;
> @@ -214,7 +218,7 @@ static int dw_pcie_ep_get_msi(struct pci_epc *epc)
> return val;
> }
>
> -static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 encode_int)
> +static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 func_no, u8 encode_int)
> {
> int val;
> struct dw_pcie_ep *ep = epc_get_drvdata(epc);
> @@ -226,7 +230,7 @@ static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 encode_int)
> return 0;
> }
>
> -static int dw_pcie_ep_raise_irq(struct pci_epc *epc,
> +static int dw_pcie_ep_raise_irq(struct pci_epc *epc, u8 func_no,
> enum pci_epc_irq_type type, u8 interrupt_num)
> {
> struct dw_pcie_ep *ep = epc_get_drvdata(epc);
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index f9308c2f22e6..7bacca8daec6 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -104,7 +104,8 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
> goto err;
> }
>
> - ret = pci_epc_map_addr(epc, src_phys_addr, reg->src_addr, reg->size);
> + ret = pci_epc_map_addr(epc, epf->func_no, src_phys_addr, reg->src_addr,
> + reg->size);
> if (ret) {
> dev_err(dev, "failed to map source address\n");
> reg->status = STATUS_SRC_ADDR_INVALID;
> @@ -119,7 +120,8 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
> goto err_src_map_addr;
> }
>
> - ret = pci_epc_map_addr(epc, dst_phys_addr, reg->dst_addr, reg->size);
> + ret = pci_epc_map_addr(epc, epf->func_no, dst_phys_addr, reg->dst_addr,
> + reg->size);
> if (ret) {
> dev_err(dev, "failed to map destination address\n");
> reg->status = STATUS_DST_ADDR_INVALID;
> @@ -128,13 +130,13 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
>
> memcpy(dst_addr, src_addr, reg->size);
>
> - pci_epc_unmap_addr(epc, dst_phys_addr);
> + pci_epc_unmap_addr(epc, epf->func_no, dst_phys_addr);
>
> err_dst_addr:
> pci_epc_mem_free_addr(epc, dst_phys_addr, dst_addr, reg->size);
>
> err_src_map_addr:
> - pci_epc_unmap_addr(epc, src_phys_addr);
> + pci_epc_unmap_addr(epc, epf->func_no, src_phys_addr);
>
> err_src_addr:
> pci_epc_mem_free_addr(epc, src_phys_addr, src_addr, reg->size);
> @@ -164,7 +166,8 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
> goto err;
> }
>
> - ret = pci_epc_map_addr(epc, phys_addr, reg->src_addr, reg->size);
> + ret = pci_epc_map_addr(epc, epf->func_no, phys_addr, reg->src_addr,
> + reg->size);
> if (ret) {
> dev_err(dev, "failed to map address\n");
> reg->status = STATUS_SRC_ADDR_INVALID;
> @@ -186,7 +189,7 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
> kfree(buf);
>
> err_map_addr:
> - pci_epc_unmap_addr(epc, phys_addr);
> + pci_epc_unmap_addr(epc, epf->func_no, phys_addr);
>
> err_addr:
> pci_epc_mem_free_addr(epc, phys_addr, src_addr, reg->size);
> @@ -215,7 +218,8 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
> goto err;
> }
>
> - ret = pci_epc_map_addr(epc, phys_addr, reg->dst_addr, reg->size);
> + ret = pci_epc_map_addr(epc, epf->func_no, phys_addr, reg->dst_addr,
> + reg->size);
> if (ret) {
> dev_err(dev, "failed to map address\n");
> reg->status = STATUS_DST_ADDR_INVALID;
> @@ -242,7 +246,7 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
> kfree(buf);
>
> err_map_addr:
> - pci_epc_unmap_addr(epc, phys_addr);
> + pci_epc_unmap_addr(epc, epf->func_no, phys_addr);
>
> err_addr:
> pci_epc_mem_free_addr(epc, phys_addr, dst_addr, reg->size);
> @@ -260,11 +264,11 @@ static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test, u8 irq)
> struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
>
> reg->status |= STATUS_IRQ_RAISED;
> - msi_count = pci_epc_get_msi(epc);
> + msi_count = pci_epc_get_msi(epc, epf->func_no);
> if (irq > msi_count || msi_count <= 0)
> - pci_epc_raise_irq(epc, PCI_EPC_IRQ_LEGACY, 0);
> + pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_LEGACY, 0);
> else
> - pci_epc_raise_irq(epc, PCI_EPC_IRQ_MSI, irq);
> + pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSI, irq);
> }
>
> static void pci_epf_test_cmd_handler(struct work_struct *work)
> @@ -291,7 +295,7 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
>
> if (command & COMMAND_RAISE_LEGACY_IRQ) {
> reg->status = STATUS_IRQ_RAISED;
> - pci_epc_raise_irq(epc, PCI_EPC_IRQ_LEGACY, 0);
> + pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_LEGACY, 0);
> goto reset_handler;
> }
>
> @@ -326,11 +330,11 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
> }
>
> if (command & COMMAND_RAISE_MSI_IRQ) {
> - msi_count = pci_epc_get_msi(epc);
> + msi_count = pci_epc_get_msi(epc, epf->func_no);
> if (irq > msi_count || msi_count <= 0)
> goto reset_handler;
> reg->status = STATUS_IRQ_RAISED;
> - pci_epc_raise_irq(epc, PCI_EPC_IRQ_MSI, irq);
> + pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSI, irq);
> goto reset_handler;
> }
>
> @@ -358,7 +362,7 @@ static void pci_epf_test_unbind(struct pci_epf *epf)
> for (bar = BAR_0; bar <= BAR_5; bar++) {
> if (epf_test->reg[bar]) {
> pci_epf_free_space(epf, epf_test->reg[bar], bar);
> - pci_epc_clear_bar(epc, bar);
> + pci_epc_clear_bar(epc, epf->func_no, bar);
> }
> }
> }
> @@ -380,7 +384,8 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
>
> for (bar = BAR_0; bar <= BAR_5; bar++) {
> epf_bar = &epf->bar[bar];
> - ret = pci_epc_set_bar(epc, bar, epf_bar->phys_addr,
> + ret = pci_epc_set_bar(epc, epf->func_no, bar,
> + epf_bar->phys_addr,
> epf_bar->size, flags);
> if (ret) {
> pci_epf_free_space(epf, epf_test->reg[bar], bar);
> @@ -433,7 +438,7 @@ static int pci_epf_test_bind(struct pci_epf *epf)
> if (WARN_ON_ONCE(!epc))
> return -EINVAL;
>
> - ret = pci_epc_write_header(epc, header);
> + ret = pci_epc_write_header(epc, epf->func_no, header);
> if (ret) {
> dev_err(dev, "configuration header write failed\n");
> return ret;
> @@ -447,7 +452,7 @@ static int pci_epf_test_bind(struct pci_epf *epf)
> if (ret)
> return ret;
>
> - ret = pci_epc_set_msi(epc, epf->msi_interrupts);
> + ret = pci_epc_set_msi(epc, epf->func_no, epf->msi_interrupts);
> if (ret)
> return ret;
>
> diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
> index cd7d4788b94d..77420364a728 100644
> --- a/drivers/pci/endpoint/pci-epc-core.c
> +++ b/drivers/pci/endpoint/pci-epc-core.c
> @@ -141,25 +141,26 @@ EXPORT_SYMBOL_GPL(pci_epc_start);
> /**
> * pci_epc_raise_irq() - interrupt the host system
> * @epc: the EPC device which has to interrupt the host
> + * @func_no: the endpoint function number in the EPC device
> * @type: specify the type of interrupt; legacy or MSI
> * @interrupt_num: the MSI interrupt number
> *
> * Invoke to raise an MSI or legacy interrupt
> */
> -int pci_epc_raise_irq(struct pci_epc *epc, enum pci_epc_irq_type type,
> - u8 interrupt_num)
> +int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
> + enum pci_epc_irq_type type, u8 interrupt_num)
> {
> int ret;
> unsigned long flags;
>
> - if (IS_ERR(epc))
> + if (IS_ERR(epc) || func_no > BAR_5)

why is function number compared with BAR? here and everywhere below..

Thanks
Kishon

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