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Subject[PATCH v4 1/2] hyperv-fb: add support for generation 2 virtual machines.
Date
UEFI-based generation 2 virtual machines support vmbus devices only.
There is no pci bus. Thus they use a different mechanism for the
graphics framebuffer: Instead of using the vga pci bar a chunk of
memory muct be allocated from the hyperv mmio region declared using
APCI. This patch implements support for it.

Based on a patch by Haiyang Zhang <haiyangz@microsoft.com>

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
drivers/video/hyperv_fb.c | 86 +++++++++++++++++++++++++++++++++--------------
1 file changed, 60 insertions(+), 26 deletions(-)

diff --git a/drivers/video/hyperv_fb.c b/drivers/video/hyperv_fb.c
index 130708f..b7b3dd0 100644
--- a/drivers/video/hyperv_fb.c
+++ b/drivers/video/hyperv_fb.c
@@ -42,6 +42,7 @@
#include <linux/completion.h>
#include <linux/fb.h>
#include <linux/pci.h>
+#include <linux/efi.h>

#include <linux/hyperv.h>

@@ -212,6 +213,7 @@ struct synthvid_msg {

struct hvfb_par {
struct fb_info *info;
+ struct resource mem;
bool fb_ready; /* fb device is ready */
struct completion wait;
u32 synthvid_version;
@@ -460,13 +462,13 @@ static int synthvid_connect_vsp(struct hv_device *hdev)
goto error;
}

- if (par->synthvid_version == SYNTHVID_VERSION_WIN7) {
+ if (par->synthvid_version == SYNTHVID_VERSION_WIN7)
screen_depth = SYNTHVID_DEPTH_WIN7;
- screen_fb_size = SYNTHVID_FB_SIZE_WIN7;
- } else {
+ else
screen_depth = SYNTHVID_DEPTH_WIN8;
- screen_fb_size = SYNTHVID_FB_SIZE_WIN8;
- }
+
+ screen_fb_size = hdev->channel->offermsg.offer.
+ mmio_megabytes * 1024 * 1024;

return 0;

@@ -627,26 +629,46 @@ static void hvfb_get_option(struct fb_info *info)
/* Get framebuffer memory from Hyper-V video pci space */
static int hvfb_getmem(struct fb_info *info)
{
- struct pci_dev *pdev;
- ulong fb_phys;
+ struct hvfb_par *par = info->par;
+ struct pci_dev *pdev = NULL;
void __iomem *fb_virt;
+ int gen2vm = efi_enabled(EFI_BOOT);
+ int ret;

- pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
+ par->mem.name = KBUILD_MODNAME;
+ par->mem.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ if (gen2vm) {
+ ret = allocate_resource(&hyperv_mmio, &par->mem,
+ screen_fb_size,
+ 0, -1,
+ screen_fb_size,
+ NULL, NULL);
+ if (ret != 0) {
+ pr_err("Unable to allocate framebuffer memory\n");
+ return -ENODEV;
+ }
+ } else {
+ pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
- if (!pdev) {
- pr_err("Unable to find PCI Hyper-V video\n");
- return -ENODEV;
- }
+ if (!pdev) {
+ pr_err("Unable to find PCI Hyper-V video\n");
+ return -ENODEV;
+ }

- if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) ||
- pci_resource_len(pdev, 0) < screen_fb_size)
- goto err1;
+ if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) ||
+ pci_resource_len(pdev, 0) < screen_fb_size)
+ goto err1;

- fb_phys = pci_resource_end(pdev, 0) - screen_fb_size + 1;
- if (!request_mem_region(fb_phys, screen_fb_size, KBUILD_MODNAME))
- goto err1;
+ par->mem.end = pci_resource_end(pdev, 0);
+ par->mem.start = par->mem.end - screen_fb_size + 1;
+ ret = request_resource(&pdev->resource[0], &par->mem);
+ if (ret != 0) {
+ pr_err("Unable to request framebuffer memory\n");
+ goto err1;
+ }
+ }

- fb_virt = ioremap(fb_phys, screen_fb_size);
+ fb_virt = ioremap(par->mem.start, screen_fb_size);
if (!fb_virt)
goto err2;

@@ -654,30 +676,42 @@ static int hvfb_getmem(struct fb_info *info)
if (!info->apertures)
goto err3;

- info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
- info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
- info->fix.smem_start = fb_phys;
+ if (gen2vm) {
+ info->apertures->ranges[0].base = screen_info.lfb_base;
+ info->apertures->ranges[0].size = screen_info.lfb_size;
+ } else {
+ info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
+ info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
+ }
+
+ info->fix.smem_start = par->mem.start;
info->fix.smem_len = screen_fb_size;
info->screen_base = fb_virt;
info->screen_size = screen_fb_size;

- pci_dev_put(pdev);
+ if (!gen2vm)
+ pci_dev_put(pdev);
+
return 0;

err3:
iounmap(fb_virt);
err2:
- release_mem_region(fb_phys, screen_fb_size);
+ release_resource(&par->mem);
err1:
- pci_dev_put(pdev);
+ if (!gen2vm)
+ pci_dev_put(pdev);
+
return -ENOMEM;
}

/* Release the framebuffer */
static void hvfb_putmem(struct fb_info *info)
{
+ struct hvfb_par *par = info->par;
+
iounmap(info->screen_base);
- release_mem_region(info->fix.smem_start, screen_fb_size);
+ release_resource(&par->mem);
}


--
1.8.3.1


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